JP3931666B2 - Power line carrier communication equipment - Google Patents

Power line carrier communication equipment Download PDF

Info

Publication number
JP3931666B2
JP3931666B2 JP2002015058A JP2002015058A JP3931666B2 JP 3931666 B2 JP3931666 B2 JP 3931666B2 JP 2002015058 A JP2002015058 A JP 2002015058A JP 2002015058 A JP2002015058 A JP 2002015058A JP 3931666 B2 JP3931666 B2 JP 3931666B2
Authority
JP
Japan
Prior art keywords
power line
signal
data
wavelet
communication
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2002015058A
Other languages
Japanese (ja)
Other versions
JP2003218831A (en
Inventor
宣貴 児玉
久雄 古賀
Original Assignee
松下電器産業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 松下電器産業株式会社 filed Critical 松下電器産業株式会社
Priority to JP2002015058A priority Critical patent/JP3931666B2/en
Priority claimed from AU2003237796A external-priority patent/AU2003237796A1/en
Publication of JP2003218831A publication Critical patent/JP2003218831A/en
Application granted granted Critical
Publication of JP3931666B2 publication Critical patent/JP3931666B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power line carrier communication device that performs data transmission using a power line.
[0002]
[Prior art]
A major feature of the power line carrier communication device is that a home communication network can be constructed immediately by using a power line already in each home as a network transmission path. However, since the power line carrier communication device transmits and receives signals using a power line with a poor balance as a communication medium, leakage power from the power line is large. In addition, in the frequency band necessary for high-speed power line carrier communication, amateur radio, short wave broadcasting, and the like already use the frequency band. Therefore, interference from the power line carrier communication apparatus with respect to these existing communication systems becomes a problem. Various restrictions on items such as the frequency band to be used and allowable electric field strength are added to the items regulated by the Radio Law and Communication Law established in each country, and the frequency band used for communication should be restricted accordingly. Is required. In addition, since various electric devices are connected to a general power line that is a communication medium of a power line carrier communication device, the impedance of the power line that affects communication performance, noise on the power line, signal attenuation during transmission, etc. It differs depending on the wiring state of the power line in each household, changes depending on the electric equipment connected to the power line, and the characteristics vary greatly depending on the frequency.
[0003]
As described above, in power line carrier communication using a power line as a communication medium, there are concerns about communication failure due to impedance fluctuation, noise, signal attenuation, etc. of the power line, and interference with other existing communication systems. For this reason, a mechanism for avoiding the use of frequency bands with temporary communication failures and a mechanism for flexibly responding to the laws and regulations of each country, that is, a frequency band used for communication and a frequency band not used are properly distinguished, Furthermore, it is essential that they can be easily changed. Many proposals using a multicarrier transmission method have been made for this problem.
[0004]
As a conventional power line carrier communication device using a power line as a communication medium, for example, there is a device described in Japanese Patent Laid-Open No. 2000-165304.
[0005]
FIG. 25 is a block diagram showing a power line communication device described in Japanese Patent Laid-Open No. 2000-165304.
[0006]
25, 600 is a power line carrier communication device, 601 is a data divider, 602 is a QAM (Quadrature Amplitude Modulation) encoder, 603 is an inverse Fourier transformer, 604 is a parallel-serial converter, 605 is a D / A converter, 606 Is a low-pass filter, 607 is a power line coupling circuit, 608 is a power line, 609 is a low-pass filter, 610 is an A / D converter, 611 series-parallel converter, 612 is a Fourier transformer, 613 is a QAM decoder, and 614 is Data synthesizer.
[0007]
As is apparent from the configuration of FIG. 25, the power line carrier communication device described in Japanese Patent Laid-Open No. 2000-165304 uses orthogonal frequency division multiplexing (Fourier transform) transmission (hereinafter referred to as “Frequency Division Multiplexing” transmission). (OFDM transmission) method) is applied to power line carrier communication.
[0008]
Next, the operation of the power line carrier communication apparatus of FIG. 25 will be described.
[0009]
Regarding the transmission operation to the power line 608, first, transmission data is input to the data divider 601 and a bit string to be assigned to a plurality of subcarriers is generated. Next, this bit string is converted into a complex signal by the QAM encoder 602, and a frequency sample-multiplexed time sample sequence is generated via an inverse Fourier transformer 603 and a parallel-serial converter 604. This time sample sequence is transmitted to the power line 608 via the D / A converter 605, the low-pass filter 606, and the power line coupling circuit 607. On the contrary, in the reception operation from the power line 608, the A / D converter 610 converts an analog signal (power line communication signal) received through the power line coupling circuit 607 and the low-pass filter 609 into a digital signal. Next, this digital signal is converted into a QAM code for each frequency via a serial-parallel converter 611 and a Fourier transformer 612. Each QAM code is demodulated by a QAM decoder 613 and the demodulated data is synthesized by a data synthesizer 614.
[0010]
As described above, according to this power line carrier communication apparatus, the transmission signal is configured by a carrier wave (subcarrier) having a plurality of frequency spectrums by the OFDM transmission method, and each of those is determined according to the frequency characteristics of power line noise and attenuation. By adaptively changing the amount of information to be superimposed on the subcarrier, there is an effect that communication can be performed by using the frequency with high efficiency and improving the transmission speed. In addition, by controlling the circuit on the transmission side so that arbitrary subcarriers are not used, communication in a frequency band with a poor transmission path environment is avoided, and multi-values are actively added in a frequency band in which the transmission path condition is good. By performing modulation, stable communication can be performed. Further, this control can output a signal conforming to the laws and regulations of each country.
[0011]
[Problems to be solved by the invention]
However, the conventional power line carrier communication apparatus has the following problems. This will be described with reference to FIGS. FIG. 26 is a graph showing a guard interval mechanism, and FIG. 27 is a graph showing OFDM filter bank characteristics.
[0012]
In a conventional power line carrier communication apparatus, OFDM transmission using Fourier transform is performed in communication using a power line. OFDM transmission using Fourier transform is shown in FIG. 26 in order to reduce the influence of multipath. It is necessary to provide such a guard interval section in the signal section. The guard interval section is redundant from the viewpoint of information transmission, and the frequency utilization efficiency is reduced accordingly. Also, the shorter the guard interval interval, the better the transmission efficiency, but it is more susceptible to multipath on the receiving side, leading to a deterioration in error rate characteristics. In the power line communication environment, since the delay time of the delayed wave due to multipath is particularly large, it is necessary to increase the guard interval section, and as a result, the rate at which the transmission speed is sacrificed becomes extremely large. In addition, with respect to avoiding interference with existing systems, the conventional method uses a method in which the amplitude of the signal in the band used by the existing system is theoretically zero by not allocating (masking) data to subcarriers. It is done. FIG. 19 (described later) shows an example in which masking is performed on a band not used in the OFDM system. Although the amplitude of the masked subcarrier does not appear, the attenuation of only about 13 dB can be obtained due to the leakage of the side lobe of the adjacent subcarrier. In the case of OFDM, since a square wave is used as a window function for Fourier transform, as shown in FIG. 27, only about 13 dB attenuation of the side lobe with respect to the main lobe can be obtained. Therefore, the interference with the existing communication system cannot be reduced sufficiently. In particular, in the frequency band used by high-speed power line carrier communication, there are already many radio systems with high reception sensitivity such as amateur radio and short wave broadcasting. In order to avoid the influence on these existing systems, it is necessary not to transmit the band used by the existing system. For this reason, in the conventional method, it is necessary to newly install a band rejection filter. This band rejection filter causes an increase in circuit scale and is necessary to operate at high speed, which is one of the factors that increase power consumption.
[0013]
In this power line carrier communication device, communication is possible even if the guard interval that causes the transmission speed deterioration is eliminated, and the frequency band used for communication is limited according to the radio wave regulations of each country, and the circuit scale increases. Therefore, it is required to obtain a sufficient attenuation amount in the use band of the existing system without installing a band rejection filter.
[0014]
In order to satisfy such requirements, the present invention allows communication even if the guard interval that causes transmission speed degradation is eliminated, limits the frequency band used for communication according to the radio wave regulations of each country, It is an object of the present invention to provide a power line carrier communication device that can obtain a sufficient amount of attenuation in a band used by an existing system without installing a band rejection filter that causes an increase in scale.
[0015]
[Means for Solving the Problems]
  In order to solve the above problems, a power line carrier communication device of the present invention superimposes a signal from a transmission unit, a reception unit, and a transmission unit on a power line as a power line communication signal and transmits only the power line communication signal from the power line. A power line carrier communication device that includes a power line coupling circuit to be extracted and a control unit that controls each component of the transmission unit and the reception unit, and performs communication using a plurality of subcarriers. A signal point mapper that generates multiple bitstreams from transmitted data and maps the bitstreams to signal points of each subcarrier, and wavelet waveforms that are orthogonal to each other based on the signal point data of each subcarrier mapped by the signal point mapper Wavelet inverse transformer that generates time waveform series data by modulating each subcarrier with, and time waveform system using wavelet inverse transformer A D / A converter for analog-converting data, and the receiving unit digitally converts the power line communication signal extracted from the power line by the power line coupling circuit to obtain sampling series waveform data; and Wavelet converter that converts sampling series waveform data by A / D converter into signal point data of each subcarrier, and a plurality of signal point data output from wavelet converter are inversely mapped and mapped by signal point mapper A symbol discriminator that discriminates the bit sequence and synthesizes it as a received data sequence.The wavelet inverse transformer and the wavelet transformer have a plurality of filter coefficient patterns having different filter lengths according to the overlap coefficient, and power line communication signals transmitted from the transmission unit, transmission path fluctuations, reception levels Select an appropriate filter coefficient pattern from the multiple filter coefficient patterns according to the receiving conditions such asIt has a configuration to do.
[0016]
  As a result, communication is possible even if the guard interval that causes transmission speed degradation is eliminated, and the band rejection filter that limits the frequency band used for communication according to the radio wave regulations of each country and causes an increase in circuit scale. To obtain sufficient attenuation in the use band of the existing system without installingIn addition, the amount of computation when the noise state of the transmission path is good can be reduced, the power consumption during reception can be reduced, and stable reception is possible even when the noise state is poor. Has the effect of being able toA power line carrier communication device is obtained.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
  A power line carrier communication apparatus according to claim 1 of the present invention superimposes a signal from a transmission unit, a reception unit, and the transmission unit on a power line as a power line communication signal and transmits only the power line communication signal from the power line. A power line coupling circuit for extracting; a control unit that controls each component of the transmission unit and the reception unit; and a power line carrier communication device that performs communication using a plurality of subcarriers, wherein the transmission unit includes: A signal point mapper that generates a plurality of bitstreams from input transmission data and maps the bitstreams to signal points of each subcarrier, and a signal point data of each subcarrier mapped by the signal point mapper. A wavelet inverse transformer that generates time waveform series data by modulating each subcarrier with wavelet waveforms orthogonal to each other, and the wavelet inverse transform And a D / A converter for analog-converting the time waveform series data by the detector, and the receiving unit digitally converts the power line communication signal extracted from the power line by the power line coupling circuit to obtain sampling series waveform data An A / D converter, a wavelet converter that converts sampling series waveform data by the A / D converter into signal point data of each subcarrier, and a plurality of signal point data output from the wavelet converter are inversely mapped A symbol discriminator that discriminates the bit string mapped by the signal point mapper and synthesizes it as a received data sequence.The wavelet inverse transformer and the wavelet transformer have a plurality of filter coefficient patterns having different filter lengths according to the overlap coefficient, and power line communication signals transmitted from the transmission unit, transmission path fluctuations, reception levels An appropriate filter coefficient pattern is selected from the plurality of filter coefficient patterns according to reception conditions such asIt is.
[0018]
  This configuration eliminates the need for redundant signal parts, such as guard intervals, that were required in OFDM transmission systems, improving frequency utilization efficiency, and performing Fourier transform that requires complex operations only for real part operations. Since this is realized by the wavelet transform performed in step (b), the amount of calculation can be reduced, and the circuit scale can be reduced. In addition, communication is possible even if the guard interval that causes transmission speed degradation is eliminated, and the band rejection filter that limits the frequency band used for communication according to the radio wave regulations of each country and causes an increase in circuit scale It is possible to obtain a sufficient amount of attenuation in the use band of the existing system without installing the.Furthermore, the amount of calculation when the noise state of the transmission path is good can be reduced, power consumption at the time of reception can be reduced, and stable reception can be performed even when the noise state is poor. Has the effect of being able to.
[0019]
  The power line carrier communication device according to claim 2, wherein a power line that superimposes a signal from the transmitter, a receiver, and the transmitter as a power line communication signal on the power line and extracts only the power line communication signal from the power line. A power line carrier communication device that includes a coupling circuit, a control unit that controls each component of the transmission unit and the reception unit, and performs communication using a plurality of subcarriers, wherein the transmission unit is input A signal point mapper that generates a plurality of bitstreams from transmission data and maps the bitstreams to signal points of each subcarrier, and orthogonal to each other based on the signal point data of each subcarrier mapped by the signal point mapper. From a wavelet inverse transformer that generates time waveform series data by modulating each subcarrier with a wavelet waveform, and the wavelet inverse transformer A transmission frequency converter that shifts the time waveform series data to be input to an arbitrary carrier frequency band, and a D / A converter that analog-converts the time waveform series data output from the transmission frequency converter. The receiving unit digitally converts a power line communication signal extracted from a power line by the power line coupling circuit to obtain sampling series waveform data, and sampling series waveform data by the A / D converter Frequency converter for obtaining a baseband signal sequence by shifting the frequency to the baseband band, and a wavelet transformer for converting the baseband signal sequence output from the reception frequency converter into signal point data of each subcarrier And inversely mapping a plurality of signal point data output from the wavelet transformer, the signal point mapper Have the symbol determiner synthesized as received data series to determine the image bit stringThe wavelet inverse transformer and the wavelet transformer have a plurality of filter coefficient patterns having different filter lengths according to the overlap coefficient, and power line communication signals transmitted from the transmission unit, transmission path fluctuations, reception levels An appropriate filter coefficient pattern is selected from the plurality of filter coefficient patterns according to reception conditions such asIt is.
[0020]
  This configuration eliminates the need for redundant signal parts, such as guard intervals, that were required in OFDM transmission systems, improving frequency utilization efficiency, and performing Fourier transform that requires complex operations only for real part operations. Since this is realized by the wavelet transform performed in step (b), the amount of calculation can be reduced, and the circuit scale can be reduced. In addition, communication is possible even if the guard interval that causes transmission speed degradation is eliminated, and the band rejection filter that limits the frequency band used for communication according to the radio wave regulations of each country and causes an increase in circuit scale It is possible to obtain a sufficient amount of attenuation in the use band of the existing system without installing the. Furthermore, since it is possible to shift to an arbitrary frequency band, for example, it is possible to easily cope with the case where the frequency bands that can be used in and outside the house are different in each country, rather than only using the baseband transmission method. The circuit scale can be further suppressed.Furthermore, the amount of calculation when the noise state of the transmission path is good can be reduced, power consumption at the time of reception can be reduced, and stable reception can be performed even when the noise state is poor. Has the effect of being able to.
[0021]
  The power line carrier communication apparatus according to claim 3, wherein a power line that superimposes a signal from the transmission unit, a reception unit, and the transmission unit as a power line communication signal on the power line and extracts only the power line communication signal from the power line. A power line carrier communication device that includes a coupling circuit, a control unit that controls each component of the transmission unit and the reception unit, and performs communication using a plurality of subcarriers, wherein the transmission unit is input A signal point mapper that generates a plurality of bitstreams from transmission data and maps the bitstreams to complex signal points of each subcarrier, and a mutual signal based on complex signal point data of each subcarrier mapped by the signal point mapper. A wavelet inverse transformer that generates complex time waveform series data by modulating each subcarrier with an orthogonal wavelet waveform, and the wavelet An orthogonal modulator that shifts the complex time waveform sequence data output from the converter to an arbitrary carrier frequency band by orthogonally modulating the complex time waveform sequence data, and D / A that converts the complex time waveform sequence data output from the orthogonal modulator into an analog signal An A converter, and the receiving unit digitally converts a power line communication signal extracted from the power line by the power line coupling circuit to obtain sampling series waveform data, and the A / D converter. A quadrature demodulator that obtains a baseband signal sequence by frequency-shifting the sampling sequence waveform data by the detector to the baseband band, and a wavelet that converts the baseband signal sequence output from the quadrature demodulator into signal point data of each subcarrier A plurality of signal point data output from the converter and the wavelet transformer, Yes a symbol decision unit for synthesizing the bit string mapped by the mapping unit as determined by the received data sequenceThe wavelet inverse transformer and the wavelet transformer have a plurality of filter coefficient patterns having different filter lengths according to the overlap coefficient, and power line communication signals transmitted from the transmission unit, transmission path fluctuations, reception levels An appropriate filter coefficient pattern is selected from the plurality of filter coefficient patterns according to reception conditions such asIt is.
[0022]
  This configuration eliminates the need for redundant signal parts, such as guard intervals, that were required in OFDM transmission systems, improving frequency utilization efficiency, and performing Fourier transform that requires complex operations only for real part operations. Since this is realized by the wavelet transform performed in step (b), the amount of calculation can be reduced, and the circuit scale can be reduced. In addition, communication is possible even if the guard interval that causes transmission speed degradation is eliminated, and the band rejection filter that limits the frequency band used for communication according to the radio wave regulations of each country and causes an increase in circuit scale It is possible to obtain a sufficient amount of attenuation in the use band of the existing system without installing the. Further, since signal point data in the complex region can be used by orthogonal modulation / demodulation, the frequency utilization efficiency can be further improved.Furthermore, the amount of calculation when the noise state of the transmission path is good can be reduced, power consumption at the time of reception can be reduced, and stable reception can be performed even when the noise state is poor. Has the effect of being able to.
[0023]
The power line carrier communication apparatus according to claim 4 is the power line carrier communication apparatus according to any one of claims 1 to 3, wherein the wavelet inverse transformer and the wavelet transformer are duplicates of complete reconfiguration or pseudo complete reconfiguration. It has an orthogonal transform function or a generalized overlapping orthogonal transform function.
[0024]
With this configuration, all the filters of the filter bank circuit that realizes the wavelet transform can have linear phase characteristics, so that the number of multipliers required for the filter bank can be halved and the circuit scale can be reduced. It has the effect of being able to. In addition, since the frequency characteristics of each subcarrier can be designed steeply with the main lobe as the center, the effect of interference from other subcarriers and noise outside the band can be reduced during reception.
[0025]
The power line carrier communication apparatus according to claim 5 is the power line carrier communication apparatus according to any one of claims 1 to 3, wherein the wavelet inverse transformer and the wavelet transformer are a modulation overlap conversion function or an extended modulation overlap conversion function. It is supposed to have.
[0026]
With this configuration, the sub-carrier frequency characteristics of each subcarrier can be designed more steeply with the main lobe as the center, so band blocking that was necessary in the past to prevent the existing system from being affected by the power line carrier communication device No filter is required, and the effect of interference from other subcarriers and out-of-band noise during reception can be reduced.
[0027]
The power line carrier communication apparatus according to claim 6 is the power line carrier communication apparatus according to any one of claims 1 to 5, wherein the wavelet inverse transformer and the wavelet transformer are configured by a polyphase filter bank circuit. It is a thing.
[0028]
With this configuration, the operation at the time of modulation and demodulation can be performed at a low rate and the operation clock frequency can be lowered, so that the power consumption of the circuit can be reduced. Have In addition, since the operation clock frequency can be lowered, the arithmetic unit can be used and the circuit scale can be reduced.
[0029]
  The power line carrier communication device according to claim 7,A transmission unit, a reception unit, a power line coupling circuit that superimposes a signal from the transmission unit on a power line as a power line communication signal and extracts only the power line communication signal from the power line, and the transmission unit and the reception unit A power line carrier communication device that performs communication using a plurality of subcarriers, wherein the transmission unit generates a plurality of bit strings from input transmission data, and A signal point mapper that maps a bit string to a signal point of each subcarrier, and modulation of each subcarrier with wavelet waveforms orthogonal to each other based on the signal point data of each subcarrier mapped by the signal point mapper Wavelet inverse transformer for generating time waveform series data, and analog conversion of time waveform series data by the wavelet inverse transformer An A / D converter, and the receiving unit digitally converts a power line communication signal extracted from a power line by the power line coupling circuit to obtain sampling series waveform data, and the A / D converter Wavelet converter for converting sampling series waveform data by converter to signal point data of each subcarrier, and a plurality of signal point data output from said wavelet converter are inversely mapped and mapped by said signal point mapper A symbol discriminator that discriminates a bit string and combines it as a received data sequence;The wavelet inverse transformer and the wavelet transformer are configured by a lattice bank filter bank circuit.The wavelet inverse transformer and the wavelet transformer further have a plurality of plane rotation angle patterns corresponding to overlapping coefficients, and power line communication signals transmitted from the transmission unit, transmission path fluctuations, reception levels, etc. An appropriate plane rotation angle parameter is selected from the plurality of plane rotation angle parameters according to the reception condition of the power line carrier communication deviceIt is what.
[0030]
  With this configuration,A wavelet transform that eliminates the need for redundant signal parts called guard intervals, which was necessary in the OFDM transmission system, improves frequency utilization efficiency, and performs Fourier transform that requires complex operations only with real part operations. Therefore, the amount of calculation can be reduced and the circuit scale can be reduced. In addition, communication is possible even if the guard interval that causes transmission speed degradation is eliminated, and the band rejection filter that limits the frequency band used for communication according to the radio wave regulations of each country and causes an increase in circuit scale It is possible to obtain a sufficient amount of attenuation in the use band of the existing system without installing the.
furtherSince the operation at the time of the orthogonal orthogonal transformation at the time of modulation and demodulation can be executed at a low rate and the operation clock frequency can be lowered, the power consumption of the circuit can be reduced. In addition, since the amount of calculation can be reduced by using a high-speed DCT together, the power consumption and circuit scale of the circuit can be reduced.
  Furthermore, the amount of calculation when the noise state of the transmission path is good can be reduced, power consumption at the time of reception can be reduced, and stable reception can be performed even when the noise state is poor. Has the effect of being able to. Further, there is no need to prepare a plurality of filter coefficient patterns, and the storage capacity can be reduced.
[0033]
  Claim8The power line carrier communication device described inA transmission unit, a reception unit, a power line coupling circuit that superimposes a signal from the transmission unit on a power line as a power line communication signal and extracts only the power line communication signal from the power line, and the transmission unit and the reception unit A power line carrier communication device that performs communication using a plurality of subcarriers, wherein the transmission unit generates a plurality of bit strings from input transmission data, and A signal point mapper that maps a bit string to a signal point of each subcarrier, and modulation of each subcarrier with wavelet waveforms orthogonal to each other based on the signal point data of each subcarrier mapped by the signal point mapper Wavelet inverse transformer for generating time waveform series data, and arbitrary time waveform series data output from the wavelet inverse transformer. A transmission frequency converter that shifts the frequency to a wave frequency band; and a D / A converter that analog-converts time waveform series data output from the transmission frequency converter, wherein the reception unit is connected to the power line An A / D converter that digitally converts a power line communication signal extracted from a power line by a circuit to obtain sampling series waveform data, and a base frequency band obtained by shifting the sampling series waveform data by the A / D converter to a baseband band. A receiving frequency converter for obtaining a band signal sequence, a wavelet converter for converting the baseband signal sequence output from the receiving frequency converter into signal point data of each subcarrier, and an output from the wavelet converter Receiving data system by inversely mapping a plurality of signal point data and discriminating the bit string mapped by the signal point mapper The wavelet inverse transformer and the wavelet transformer are configured by a lattice-structure filter bank circuit, and the wavelet inverse transformer and the wavelet transformer are further converted into overlapping coefficients. A plurality of plane rotation angle patterns corresponding to the power line communication signal transmitted from the transmitter, transmission path variation, reception conditions such as reception level, and the like. Power line carrier communication apparatus characterized by selecting a plane rotation angle parameterIt is what.
[0034]
  With this configuration,A wavelet transform that eliminates the need for redundant signal parts called guard intervals, which was necessary in the OFDM transmission system, improves frequency utilization efficiency, and performs Fourier transform that requires complex operations only with real part operations. Therefore, the amount of calculation can be reduced and the circuit scale can be reduced. In addition, communication is possible even if the guard interval that causes transmission speed degradation is eliminated, and the band rejection filter that limits the frequency band used for communication according to the radio wave regulations of each country and causes an increase in circuit scale It is possible to obtain a sufficient amount of attenuation in the use band of the existing system without installing the. Furthermore, since it is possible to shift to an arbitrary frequency band, for example, it is possible to easily cope with the case where the frequency bands that can be used in and outside the house are different in each country, rather than only using the baseband transmission method. The circuit scale can be further suppressed.
In addition, the operation at the time of modulation and demodulation can be performed at a low rate and the operation clock frequency can be lowered, so that the power consumption of the circuit can be reduced. . In addition, since the amount of calculation can be reduced by using a high-speed DCT together, the power consumption and circuit scale of the circuit can be reduced.
  Furthermore, the amount of calculation when the noise state of the transmission path is good can be reduced, power consumption at the time of reception can be reduced, and stable reception can be performed even when the noise state is poor. Has the effect of being able to. Further, there is no need to prepare a plurality of filter coefficient patterns, and the storage capacity can be reduced.
[0035]
  Claim9The power line carrier communication device described inA transmission unit, a reception unit, a power line coupling circuit that superimposes a signal from the transmission unit on a power line as a power line communication signal and extracts only the power line communication signal from the power line, and the transmission unit and the reception unit A power line carrier communication device that performs communication using a plurality of subcarriers, wherein the transmission unit generates a plurality of bit strings from input transmission data, and A signal point mapper that maps a bit string to a complex signal point of each subcarrier, and each subcarrier is modulated with wavelet waveforms orthogonal to each other based on the complex signal point data of each subcarrier mapped by the signal point mapper. Wavelet inverse transformer for generating complex time waveform series data, and complex time waveform series output from the wavelet inverse transformer A quadrature modulator that shifts the frequency to an arbitrary carrier frequency band by performing quadrature modulation of the data, and a D / A converter that analog-converts complex time waveform series data output from the quadrature modulator, The receiving unit digitally converts the power line communication signal extracted from the power line by the power line coupling circuit to obtain sampling series waveform data, and baseband the sampling series waveform data by the A / D converter. From a quadrature demodulator that obtains a baseband signal sequence by frequency shifting to a band, a wavelet transformer that converts the baseband signal sequence output from the quadrature demodulator into signal point data of each subcarrier, and the wavelet transformer A plurality of signal point data to be output are inversely mapped, and the bit string mapped by the signal point mapper is discriminated and received. A symbol determiner that synthesizes as a data series, wherein the wavelet inverse transformer and the wavelet transformer are configured by a lattice-structure filter bank circuit, and the wavelet inverse transformer and the wavelet transformer further overlap each other. It has a plurality of plane rotation angle patterns according to the coefficients, and from among the plurality of plane rotation angle parameters according to the reception conditions such as the power line communication signal transmitted from the transmission unit, transmission path fluctuation, reception level, etc. A power line carrier communication device characterized by selecting an appropriate plane rotation angle parameterIt is what.
[0036]
  This configuration eliminates the need for redundant signal parts, such as guard intervals, that were required in OFDM transmission systems, improving frequency utilization efficiency, and performing Fourier transform that requires complex operations only for real part operations. Since this is realized by the wavelet transform performed in step (b), the amount of calculation can be reduced, and the circuit scale can be reduced. In addition, communication is possible even if the guard interval that causes transmission speed degradation is eliminated, and the band rejection filter that limits the frequency band used for communication according to the radio wave regulations of each country and causes an increase in circuit scale It is possible to obtain a sufficient amount of attenuation in the use band of the existing system without installing the. Further, since signal point data in the complex region can be used by orthogonal modulation / demodulation, the frequency utilization efficiency can be further improved.
In addition, the operation at the time of modulation and demodulation can be performed at a low rate and the operation clock frequency can be lowered, so that the power consumption of the circuit can be reduced. . In addition, since the amount of calculation can be reduced by using a high-speed DCT together, the power consumption and circuit scale of the circuit can be reduced.
Furthermore, the amount of calculation when the noise state of the transmission path is good can be reduced, power consumption at the time of reception can be reduced, and stable reception can be performed even when the noise state is poor. Has the effect of being able to. Further, there is no need to prepare a plurality of filter coefficient patterns, and the storage capacity can be reduced.
[0037]
  Claim10The power line carrier communication device described inThe said wavelet inverse transformer and the said wavelet transformer have a duplication orthogonal transformation function or generalized duplication orthogonal transformation function of perfect reconstruction or pseudo perfect reconstruction, The any one of Claim 7 thru | or 9 characterized by the above-mentioned. Power line communication equipmentIt is what.
[0038]
  With this configuration,Since all the filters of the filter bank circuit that implements the wavelet transform can have linear phase characteristics, the number of multipliers required for the filter bank can be halved, and the circuit scale can be reduced. Has an effect. In addition, since the frequency characteristics of each subcarrier can be designed steeply with the main lobe as the center, the effect of interference from other subcarriers and noise outside the band can be reduced during reception.
In addition, the operation at the time of modulation and demodulation can be performed at a low rate and the operation clock frequency can be lowered, so that the power consumption of the circuit can be reduced. . In addition, since the amount of calculation can be reduced by using a high-speed DCT together, the power consumption and circuit scale of the circuit can be reduced.
Furthermore, the amount of calculation when the noise state of the transmission path is good can be reduced, power consumption at the time of reception can be reduced, and stable reception can be performed even when the noise state is poor. Has the effect of being able to. Further, there is no need to prepare a plurality of filter coefficient patterns, and the storage capacity can be reduced.
[0039]
  Claim11The power line carrier communication device described in10. The power line carrier communication apparatus according to claim 7, wherein the wavelet inverse transformer and the wavelet transformer have a modulation overlap conversion function or an extended modulation overlap conversion function.It is what.
[0040]
  With this configuration,Since the side lobe frequency characteristics of each subcarrier can be designed more steeply with the main lobe as the center, it is necessary to use a band-rejection filter that was necessary in the past for the purpose of not affecting the existing system in the power line carrier communication device. In addition, it has an effect that the influence of interference from other subcarriers and noise outside the band can be reduced during reception.
In addition, the operation at the time of modulation and demodulation can be performed at a low rate and the operation clock frequency can be lowered, so that the power consumption of the circuit can be reduced. . In addition, since the amount of calculation can be reduced by using a high-speed DCT together, the power consumption and circuit scale of the circuit can be reduced.
Furthermore, the amount of calculation when the noise state of the transmission path is good can be reduced, power consumption at the time of reception can be reduced, and stable reception can be performed even when the noise state is poor. Has the effect of being able to. Further, there is no need to prepare a plurality of filter coefficient patterns, and the storage capacity can be reduced.
[0041]
  Claim12The power line carrier communication device described inThe control unit outputs a selection signal for selecting a subcarrier for mapping and modulating data to the signal point mapper, and the signal point mapper selects a selected subcarrier based on the selection signal. 12. The power line carrier communication apparatus according to claim 1, wherein data is mapped, and data for subcarriers not selected is mapped to zero.It is what.
[0042]
  With this configuration,Subcarriers to be output can be easily selected, signals can be output only at specific frequencies, and even if the frequency that can be used varies from country to country due to country-specific regulations It has the effect | action that it can respond to.
The power line carrier communication apparatus according to claim 13, wherein a power line that superimposes a signal from the transmitter, a receiver, and the transmitter as a power line communication signal on the power line and extracts only the power line communication signal from the power line. A power line carrier communication device that includes a coupling circuit, a control unit that controls each component of the transmission unit and the reception unit, and performs communication using a plurality of subcarriers, wherein the transmission unit is input A signal point mapper that generates a plurality of bitstreams from transmission data and maps the bitstreams to signal points of each subcarrier, and orthogonal to each other based on the signal point data of each subcarrier mapped by the signal point mapper. A wavelet inverse transformer that generates time waveform series data by modulating each subcarrier with a wavelet waveform, and the wavelet inverse transformer A D / A converter for analog-converting the time waveform series data to be obtained, and the receiving unit digitally converts the power line communication signal extracted from the power line by the power line coupling circuit to obtain sampling series waveform data A An A / D converter, a wavelet converter that converts sampling series waveform data from the A / D converter into signal point data of each subcarrier, and a plurality of signal point data output from the wavelet converter are inversely mapped. And a symbol determination unit that determines a bit string mapped by the signal point mapper and combines it as a received data sequence, and the control unit maps subcarriers for mapping and modulating data to the signal point mapper. A selection signal to be selected is output, and the signal point mapper performs data on the selected subcarrier based on the selection signal. Mapping, data for subcarriers not selected is obtained by the power line communication apparatus characterized by mapping the zero.
With this configuration, it is possible to easily select the subcarriers to be output, and it is possible to output signals only at specific frequencies, and the frequency that can be used varies from country to country due to country-specific laws and regulations. However, it has the effect | action that it can respond easily.
The power line carrier communication apparatus according to claim 14, wherein a power line that superimposes a signal from the transmission unit, a reception unit, and the transmission unit as a power line communication signal on the power line and extracts only the power line communication signal from the power line. A power line carrier communication device that includes a coupling circuit, a control unit that controls each component of the transmission unit and the reception unit, and performs communication using a plurality of subcarriers, wherein the transmission unit is input A signal point mapper that generates a plurality of bitstreams from transmission data and maps the bitstreams to signal points of each subcarrier, and orthogonal to each other based on the signal point data of each subcarrier mapped by the signal point mapper. A wavelet inverse transformer that generates time waveform series data by modulating each subcarrier with a wavelet waveform, and the wavelet inverse transformer A transmission frequency converter for shifting the time waveform series data output to an arbitrary carrier frequency band, and a D / A converter for analog conversion of the time waveform series data output from the transmission frequency converter are provided. The receiving unit digitally converts a power line communication signal extracted from a power line by the power line coupling circuit to obtain sampling series waveform data, and sampling series waveform data by the A / D converter Frequency converter for obtaining a baseband signal sequence by shifting the frequency to the baseband band, and a wavelet transformer for converting the baseband signal sequence output from the reception frequency converter into signal point data of each subcarrier A plurality of signal point data output from the wavelet transformer, and the signal point mapper A symbol determiner that determines a mapped bit string and combines it as a received data sequence, and the control unit outputs a selection signal for selecting a subcarrier for mapping and modulating data to the signal point mapper. The signal point mapper maps data on selected subcarriers based on the selection signal, and maps data on unselected subcarriers to zero. It is what.
With this configuration, it is possible to easily select the subcarrier to be output, and it is possible to output a signal only at a specific frequency, and the frequency that can be used for each country in accordance with country-specific laws and regulations. Even if they are different, it has an effect that it can be easily handled.
The power line carrier communication apparatus according to claim 15, wherein a power line that superimposes a signal from the transmission unit, a reception unit, and the transmission unit as a power line communication signal on the power line and extracts only the power line communication signal from the power line. A power line carrier communication device that includes a coupling circuit, a control unit that controls each component of the transmission unit and the reception unit, and performs communication using a plurality of subcarriers, wherein the transmission unit is input A signal point mapper that generates a plurality of bitstreams from transmission data and maps the bitstreams to complex signal points of each subcarrier, and a mutual signal based on complex signal point data of each subcarrier mapped by the signal point mapper. A wavelet inverse transformer that generates complex time waveform series data by modulating each subcarrier with an orthogonal wavelet waveform, and the wavelet A quadrature modulator that performs frequency shift to an arbitrary carrier frequency band by performing orthogonal modulation on complex time waveform series data output from an inverse converter, and D that performs analog conversion on complex time waveform series data output from the quadrature modulator An A / D converter, and the receiving unit digitally converts a power line communication signal extracted from a power line by the power line coupling circuit to obtain sampling series waveform data, and the A / D converter A quadrature demodulator that obtains a baseband signal sequence by frequency-shifting the sampling sequence waveform data by the converter to the baseband band, and converts the baseband signal sequence output from the quadrature demodulator into signal point data of each subcarrier. A wavelet transformer and a plurality of signal point data output from the wavelet transformer are inversely mapped to obtain the signal. A symbol determiner that discriminates a bit string mapped by the point mapper and combines it as a received data sequence, and the control unit selects a subcarrier for mapping and modulating data to the signal point mapper The signal point mapper maps data to selected subcarriers based on the selection signal, and maps data to unselected subcarriers to zero based on the selection signal. This is a power line carrier communication device.
With this configuration, it is possible to easily select the subcarriers to be output, and it is possible to output signals only at specific frequencies, and the frequency that can be used varies from country to country due to country-specific laws and regulations. However, it has the effect | action that it can respond easily.
The power line carrier communication device according to claim 16, wherein the wavelet inverse transformer and the wavelet transformer have a fully orthogonal reconstruction function or a pseudo perfect reconstruction overlapping orthogonal transformation function or a generalized overlapping orthogonal transformation function. The power line carrier communication device according to any one of claims 13 to 15.
With this configuration, all the filters of the filter bank circuit that realizes the wavelet transform can have linear phase characteristics, so that the number of multipliers required for the filter bank can be halved and the circuit scale can be reduced. It has the effect of being able to. In addition, since the frequency characteristics of each subcarrier can be designed steeply with the main lobe as the center, the effect of interference from other subcarriers and noise outside the band can be reduced during reception.
The power line carrier communication apparatus according to claim 17, wherein the wavelet inverse transformer and the wavelet transformer have a modulation duplication conversion function or an extended modulation duplication transformation function. The power line carrier communication device described in 1. is used.
With this configuration, the side lobe frequency characteristics of each subcarrier can be designed more steeply with the main lobe as the center, so band blocking that was previously necessary for the purpose of not affecting the existing system in the power line carrier communication equipment No filter is required, and the effect of interference from other subcarriers and out-of-band noise during reception can be reduced.
The power line carrier communication apparatus according to claim 18, wherein the wavelet inverse transformer and the wavelet transformer are configured by a polyphase filter bank circuit. This is a carrier communication device.
With this configuration, the operation at the time of modulation and demodulation can be performed at a low rate and the operation clock frequency can be lowered, so that the power consumption of the circuit can be reduced. Have Also, the operating clock frequency can be lowered Thus, the operation unit can be used and the circuit scale can be reduced.
The power line carrier communication apparatus according to claim 19, wherein the wavelet inverse transformer and the wavelet transformer are configured by a lattice bank filter bank circuit. This is a power line carrier communication device.
With this configuration, the operation at the time of modulation and demodulation can be performed at a low rate and the operation clock frequency can be lowered, so that the power consumption of the circuit can be reduced. Have In addition, since the amount of calculation can be reduced by using a high-speed DCT together, the power consumption and circuit scale of the circuit can be reduced.
[0043]
  Claim20The power line carrier communication device described inThe control unit detects a frequency band in which relatively large noise is constantly present by estimating a noise state on the power line by a signal power to noise power ratio using a determination result by the symbol determiner. 21. The transmission unit according to claim 12, wherein the transmission unit performs control so as not to output the selection signal to the signal point mapper for a subcarrier on a frequency band in which a large amount of noise constantly exists. The power line carrier communication device describedIt is what.
[0044]
  With this configuration,Noise state on the power line can be grasped, usable subcarriers can be selected, and more reliable communication can be performed by selecting subcarriers so as to avoid frequency positions where large noise components exist in advance. It has the effect that it can be performed.
23. The power line carrier communication apparatus according to claim 21, wherein the control unit assigns a signal point mapping when priority is given to a communication speed for signal point mapping by the signal point mapper and control of the selection signal to the subcarrier. The number of signal points mapped by a signal processor increases the number of signals, and when priority is given to the reliability of data transmission, the number of signal points mapped by the signal point mapper is reduced and binarized. Item 20. The power line carrier communication device according to any one of Items 12 to 20.
With this configuration, the transmission rate can be easily changed to the specified rate, and subcarriers other than realizing the specified transmission rate can be used for other communications, improving bandwidth utilization efficiency It has the effect that it can be made.
The power line carrier communication apparatus according to claim 22, wherein the control unit investigates an error rate of each subcarrier with respect to signal point mapping by the signal point mapper and control of the selection signal to each subcarrier, and The power line carrier communication device according to any one of claims 12 to 21, wherein control is performed so that subcarriers having a low error rate are used preferentially for communication among subcarriers. .
With this configuration, the subcarriers with a low error rate are preferentially used for communication, so that the number of reception errors can be reduced.
The power line carrier communication apparatus according to claim 23, wherein the control unit sets the gain of the transmission amplifier based on a signal power-to-noise power ratio of a reception signal received by the reception unit. Item 23. The power line carrier communication device according to any one of Items 1 to 22.
With this configuration, when the noise level on the power line is low and no communication error occurs, the output level can be lowered, so that the power required for transmission can be reduced.
The power line carrier communication apparatus according to claim 24, wherein a power line that superimposes a signal from the transmitter, a receiver, and the transmitter as a power line communication signal on the power line and extracts only the power line communication signal from the power line. A power line carrier communication device that includes a coupling circuit, a control unit that controls each component of the transmission unit and the reception unit, and performs communication using a plurality of subcarriers, wherein the transmission unit is input A signal point mapper that generates a plurality of bitstreams from transmission data and maps the bitstreams to signal points of each subcarrier, and orthogonal to each other based on the signal point data of each subcarrier mapped by the signal point mapper. A wavelet inverse transformer that generates time waveform series data by modulating each subcarrier with a wavelet waveform, and the wavelet inverse transformer A D / A converter for analog-converting the time waveform series data to be obtained, and the receiving unit digitally converts the power line communication signal extracted from the power line by the power line coupling circuit to obtain sampling series waveform data A An A / D converter, a wavelet converter that converts sampling series waveform data from the A / D converter into signal point data of each subcarrier, and a plurality of signal point data output from the wavelet converter are inversely mapped. And a symbol determination unit that determines a bit string mapped by the signal point mapper and combines it as a reception data sequence, and the control unit is a signal of a reception signal received by the reception unit with a gain of the transmission amplifier. The power line carrier communication apparatus is characterized in that it is set based on the power-to-noise power ratio.
With this configuration, when the noise level on the power line is low and no communication error occurs, the output level can be lowered, so that the power required for transmission can be reduced.
The power line carrier communication device according to claim 25, wherein a power line that superimposes a signal from the transmitter, a receiver, and the transmitter as a power line communication signal on the power line and extracts only the power line communication signal from the power line. A power line carrier communication device that includes a coupling circuit, a control unit that controls each component of the transmission unit and the reception unit, and performs communication using a plurality of subcarriers, The transmission unit generates a plurality of bit sequences from input transmission data, maps the bit sequences to signal points of each subcarrier, and signal points of each subcarrier mapped by the signal point mapper Wavelet inverse transformer for generating time waveform series data by modulating each subcarrier with wavelet waveforms orthogonal to each other based on data, and time waveform series data output from the wavelet inverse transformer for any carrier frequency A transmission frequency converter that shifts the frequency to a band; and a D / A converter that analog-converts time waveform series data output from the transmission frequency converter, and the reception unit is configured by the power line coupling circuit. A / to obtain sampling series waveform data by digitally converting a power line communication signal extracted from the power line A converter, a receiving frequency converter that obtains a baseband signal sequence by frequency-shifting sampling series waveform data by the A / D converter to a baseband band, and a baseband signal output from the receiving frequency converter A wavelet transformer for converting a sequence into signal point data of each subcarrier, and a plurality of signal point data output from the wavelet transformer, and a bit string mapped by the signal point mapper is discriminated and received data A power line comprising: a symbol determination unit configured to combine as a sequence, wherein the control unit sets a gain of the transmission amplifier based on a signal power to noise power ratio of a reception signal received by the reception unit This is a carrier communication device.
With this configuration, when the noise level on the power line is low and no communication error occurs, the output level can be lowered, so that the power required for transmission can be reduced.
The power line carrier communication apparatus according to claim 26, wherein a power line that superimposes a signal from the transmitter, a receiver, and the transmitter as a power line communication signal on the power line and extracts only the power line communication signal from the power line. A power line carrier communication device that includes a coupling circuit, a control unit that controls each component of the transmission unit and the reception unit, and performs communication using a plurality of subcarriers, wherein the transmission unit is input A signal point mapper that generates a plurality of bitstreams from transmission data and maps the bitstreams to complex signal points of each subcarrier, and a mutual signal based on complex signal point data of each subcarrier mapped by the signal point mapper. A wavelet inverse transformer that generates complex time waveform series data by modulating each subcarrier with an orthogonal wavelet waveform, and the wavelet A quadrature modulator that performs frequency shift to an arbitrary carrier frequency band by performing orthogonal modulation on complex time waveform series data output from an inverse converter, and D that performs analog conversion on complex time waveform series data output from the quadrature modulator An A / D converter, and the receiving unit digitally converts a power line communication signal extracted from a power line by the power line coupling circuit to obtain sampling series waveform data, and the A / D converter A quadrature demodulator that obtains a baseband signal sequence by frequency-shifting the sampling sequence waveform data by the converter to the baseband band, and converts the baseband signal sequence output from the quadrature demodulator into signal point data of each subcarrier. A wavelet transformer and a plurality of signal point data output from the wavelet transformer are inversely mapped to obtain the signal. A symbol decision unit that discriminates a bit string mapped by the point mapper and synthesizes it as a received data sequence, and the control unit is configured to obtain a gain of the transmission amplifier as a signal power versus noise of a reception signal received by the reception unit. The power line carrier communication apparatus is characterized in that it is set based on the power ratio.
With this configuration, when the noise level on the power line is low and no communication error occurs, the output level can be lowered, so that the power required for transmission can be reduced.
28. The power line carrier communication apparatus according to claim 27, wherein the wavelet inverse transformer and the wavelet transformer have an overlap orthogonal transform function or a generalized overlap orthogonal transform function of complete reconstruction or pseudo complete reconstruction. 27. The power line carrier communication device according to any one of claims 24 to 26.
With this configuration, all the filters of the filter bank circuit that realizes the wavelet transform can have linear phase characteristics, so that the number of multipliers required for the filter bank can be halved and the circuit scale can be reduced. It has the effect of being able to. In addition, the frequency characteristics of each subcarrier can be designed steeply around the main lobe. Thus, the influence of interference from other subcarriers and out-of-band noise can be reduced.
28. The power line carrier communication apparatus according to claim 28, wherein the wavelet inverse transformer and the wavelet transformer have a modulation duplication conversion function or an extended modulation duplication conversion function. The power line carrier communication device described in 1. is used.
With this configuration, the side lobe frequency characteristics of each subcarrier can be designed more steeply with the main lobe as the center, so band blocking that was previously necessary for the purpose of not affecting the existing system in the power line carrier communication equipment No filter is required, and the effect of interference from other subcarriers and out-of-band noise during reception can be reduced.
29. The power line carrier communication apparatus according to claim 29, wherein the wavelet inverse transformer and the wavelet transformer are configured by a polyphase filter bank circuit. This is a carrier communication device.
With this configuration, the operation at the time of modulation and demodulation can be performed at a low rate and the operation clock frequency can be lowered, so that the power consumption of the circuit can be reduced. Have In addition, since the operation clock frequency can be lowered, the arithmetic unit can be used and the circuit scale can be reduced.
30. The power line carrier communication device according to claim 30, wherein the wavelet inverse transformer and the wavelet transformer are configured by a lattice bank filter bank circuit. This is a power line communication carrier device.
With this configuration, the operation at the time of modulation and demodulation can be performed at a low rate and the operation clock frequency can be lowered, so that the power consumption of the circuit can be reduced. Have In addition, since the amount of calculation can be reduced by using a high-speed DCT together, the power consumption and circuit scale of the circuit can be reduced.
[0045]
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
[0046]
(Embodiment 1)
First, differences between modulation and demodulation by Fourier transform and wavelet transform will be described with reference to FIGS. FIG. 1A is a graph for explaining the concept of a time waveform of a wavelet. FIG. 1B is a graph for explaining the concept of a frequency spectrum of a wavelet. FIG. 1A shows a data flow in orthogonal transformation. FIG. 2B is an explanatory diagram showing a data flow in the overlapping orthogonal transform.
[0047]
In modulation / demodulation using Fourier transform, each subcarrier is configured by multiplying a plurality of orthogonal functions orthogonal to each other by a rectangular wave window function, and the frequency characteristic at that time is a Sinc function (Sinx / x function). On the other hand, in modulation / demodulation using wavelet transform, each subcarrier is constituted by a plurality of wavelets orthogonal to each other. The wavelet here is a waveform that is localized both in the time domain and in the frequency domain, as shown in FIG.
[0048]
In the Fourier transform, as shown in FIG. 2A, the sample values of the input signal are blocked in the transform process without overlapping. In the example in FIG. 2A, the flow of blocking the input signal in the case of the division number 2 is shown. On the other hand, in the wavelet transform, as shown in FIG. 2 (b), the sample values of the input signal are overlapped in the form of being shifted by the number of divisions in each transform process to form blocks. The example in FIG. 2B shows the flow of input signal blocking when the number of divisions is 2 and the degree of overlap is 2. From the comparison between the two, it can be seen that the filter length in one conversion process is different even in the same division number. That is, in the Fourier transform, the shape and time length of the subcarrier waveform are uniquely determined with respect to the number of divisions, but in the wavelet transform, the shape and time length can be changed depending on the overlap of input signals. There is a degree.
[0049]
FIG. 3 is a block diagram showing the power line carrier communication apparatus according to Embodiment 1 of the present invention.
[0050]
In FIG. 3, 101 is a transmission unit, and 111 is a reception unit. The transmission unit 101 includes a signal point mapper 102, a wavelet inverse transform 103, a D / A converter 104, a transmission amplifier 105, and a band pass filter 106. The reception unit 111 includes a band pass filter 112, an amplification degree controller 113, an A / D converter 114, a wavelet transform 115, and a symbol determination unit 116. The power line carrier communication apparatus 100 includes a transmission unit 101, a reception unit 111, a power line coupling circuit 121, and a control unit 122.
[0051]
The operation of the power line carrier communication apparatus configured as described above will be described with reference to FIGS. 4 and 5. FIG. 4 is an explanatory diagram for explaining the operation of the transmission unit 101 of the power line carrier communication device, and FIG. 5 is an explanatory diagram for explaining the operation of the reception unit 111 of the power line carrier communication device. Note that the number N of subcarriers and the filter length M in the wavelet transform process have a degree of freedom, the number N of subcarriers is a power of 2, and the filter length M is an integer multiple of the number N of subcarriers. Is possible. However, in this embodiment, in order to simplify the description, a wavelet that divides the used frequency band into four is used. That is, description will be made assuming that the number N of subcarriers used for communication is four. Further, each filter constituting the wavelet has a filter length that is twice the number of subcarriers N, and performs conversion using two signal point data.
[0052]
First, the data flow of the transmission unit 101 will be described with reference to FIG.
[0053]
First, the signal point mapper 102 generates a plurality of bit strings having appropriate lengths for data to be transmitted (transmission bit series). For example, the data “00011111010110100” is divided into two bits such as “00”, “01”, “11”, “10”, “10”, “11”, “01”, “00”. A bit string to be assigned to each subcarrier is generated. Next, the signal point mapper 102 converts the generated bit sequences of “00”, “01”, “11”, and “10” into “+1”, “+3”, “−3”, “−1”, respectively. These are mapped to signal points corresponding to pulse amplitude modulation (PAM). The PAM signal point data is assigned to the input unit of the wavelet inverse transform 103 as shown by T1. The wavelet inverse transform 103 performs wavelet inverse transform using the two signal point data assigned as in T1, and outputs a sample value of the transmission waveform on the time axis in one symbol period. The D / A converter 104 outputs the time sample value (time waveform series data) at a constant sampling time. The transmission amplifier 105 amplifies this transmission waveform to the transmission signal level, and the band pass filter 106 removes unnecessary frequency components. The power line coupling circuit 121 outputs the signal shaped by the band pass filter 106 to the power line 110 as a power line communication signal. The above is the description of the data flow at the time of transmission.
[0054]
Next, the data flow of the reception unit 111 will be described with reference to FIG.
[0055]
First, the power line coupling circuit 121 extracts a power line communication signal from the power line 110. The band pass filter 112 removes an out-of-band noise signal from the signal extracted by the power line coupling circuit 121 and outputs it to the amplification degree controller 113. The amplification degree controller 113 adjusts the signal level so as to be within the dynamic range of the A / D converter 114, and the A / D converter 114 samples this signal waveform at the same timing as the sampling timing on the transmission side. And digitize. The wavelet transform 115 performs wavelet transform on this waveform data to obtain signal point data for each subcarrier. The symbol determiner 116 reverse-maps this signal point data, restores it to the bit string considered to be the closest, and obtains received data. The above is the description of the data flow at the time of reception.
[0056]
In this embodiment, high-speed communication is possible by assigning transmission data to a plurality of subcarriers in order, but more reliable by simultaneously assigning and transmitting the same data to different subcarriers. High-performance data communication is also possible.
[0057]
With the above-described configuration, a redundant signal portion called a guard interval that is necessary in the OFDM transmission method is not necessary, and transmission efficiency can be improved. In addition, since the Fourier transform that requires complex computation is realized by wavelet transformation that performs only the computation of the real part, the amount of computation can be reduced and the circuit scale can be reduced.
[0058]
(Embodiment 2)
FIG. 6 is a block diagram showing a power line carrier communication apparatus according to Embodiment 2 of the present invention. In this embodiment, a case will be described in which the baseband signal in Embodiment 1 is extended to a band signal centered on an arbitrary carrier wave.
[0059]
In FIG. 6, 101 is a transmission unit, and 111 is a reception unit. A transmission unit 101 includes a signal point mapper 102, an inverse wavelet transform 103, an SSB (Single Side Band) modulator 107 as a transmission frequency converter, a D / A converter 104, and a transmission amplifier. 105 and a band pass filter 106. The reception unit 111 includes a band pass filter 112, an amplification degree controller 113, an A / D converter 114, an SSB demodulator 117 as a reception frequency converter, a wavelet transform 115, and a symbol determiner 116. With. The power line carrier communication apparatus 100 includes a transmission unit 101, a reception unit 111, a power line coupling circuit 121, and a control unit 122.
[0060]
The operation of the power line carrier communication apparatus configured as described above will be described with reference to FIGS. 4 and 5. In the present embodiment, for the sake of simplicity, it is assumed that the used frequency band is a wavelet divided into four, and each filter constituting the wavelet has a filter length that is twice the number N of subcarriers. The operation in the present embodiment is the same except that the frequency shift of the first embodiment is performed.
[0061]
First, the data flow of the transmission unit 101 will be described with reference to FIG. First, the signal point mapper 102 generates a plurality of bit strings having appropriate lengths for data to be transmitted (transmission bit series). For example, the data “00011111010110100” is divided into two bits such as “00”, “01”, “11”, “10”, “10”, “11”, “01”, “00”. A bit string to be assigned to each subcarrier is generated. Next, the signal point mapper 102 converts the generated bit sequences of “00”, “01”, “11”, and “10” into “+1”, “+3”, “−3”, “−1”, respectively. To signal points corresponding to pulse amplitude modulation (PAM). The PAM signal point data is assigned to the input unit of the wavelet inverse transform 103 as shown by T1. The wavelet inverse transform 103 performs wavelet inverse transform using the two signal point data assigned as in T1, and outputs a sample value of the transmission waveform on the time axis in one symbol period. The SSB modulator 107 shifts the frequency of this transmission sample sequence. The D / A converter 104 outputs the frequency-shifted time sample value at a constant sampling time. The transmission amplifier 105 amplifies the transmission waveform to an appropriate level, and the band pass filter 106 removes unnecessary frequency components. The power line coupling circuit 121 outputs the signal shaped by the band pass filter 106 to the power line 110 as a power line communication signal. The above is the description of the data flow at the time of transmission.
[0062]
Next, the data flow of the reception unit 111 will be described with reference to FIG.
[0063]
First, the power line coupling circuit 121 extracts a power line communication signal from the power line 110. The band pass filter 112 removes an out-of-band noise signal from the signal extracted by the power line coupling circuit 121 and outputs it to the amplification degree controller 113. The amplification degree controller 113 adjusts the signal level so as to be within the dynamic range of the A / D converter 114, and the A / D converter 114 samples this signal waveform at the same timing as the sampling timing on the transmission side. And digitize. The SSB demodulator 117 down-converts this digital signal to the baseband band. The wavelet transform 115 performs wavelet transform on the waveform data to obtain signal point data for each subcarrier. The symbol determiner 116 reverse-maps this signal point data, restores it to the bit string considered to be the closest, and obtains received data. The above is the description of the data flow at the time of reception.
[0064]
This configuration eliminates the need for redundant signal portions called guard intervals, which are necessary in the OFDM transmission system, as in the first embodiment of the present invention, and improves frequency utilization efficiency. In addition, since the Fourier transform that requires complex computation is realized by wavelet transformation that performs only the computation of the real part, the amount of computation can be reduced and the circuit scale can be reduced. Furthermore, since it is possible to shift to an arbitrary frequency band, for example, it is possible to easily cope with the case where the frequency bands that can be used in and out of the house are different in each country, rather than only using the baseband transmission method. It is possible to further reduce the circuit scale.
[0065]
(Embodiment 3)
FIG. 7 is a block diagram showing a power line carrier communication apparatus according to Embodiment 3 of the present invention.
[0066]
In FIG. 7, 101 is a transmission unit, and 111 is a reception unit. The transmission unit 101 includes a signal point mapper 102, an inverse wavelet transform 103, a quadrature modulator 108, a D / A converter 104, a transmission amplifier 105, and a band pass filter 106. The reception unit 111 includes a band pass filter 112, an amplification degree controller 113, an A / D converter 114, an orthogonal demodulator 118, a wavelet transform 115, and a symbol determination unit 116. The power line carrier communication device 100 includes a transmission unit 101, a reception unit 111, a power line coupling circuit 121, and an overall control unit 122.
[0067]
The operation of the power line carrier communication apparatus configured as described above will be described with reference to FIGS. FIG. 8 is an explanatory diagram for explaining the operation of the transmission unit 101 of the power line carrier communication device, and FIG. 9 is an explanatory diagram for explaining the operation of the reception unit 111 of the power line carrier communication device. In this embodiment, for the sake of simplicity, it is assumed that a wavelet that divides a used frequency band into four is used, and each filter constituting the wavelet has a filter length that is twice the number of subcarriers N.
[0068]
First, the data flow of the transmission unit 101 will be described with reference to FIG.
[0069]
First, the signal point mapper 102 generates a plurality of bit strings having appropriate lengths for data to be transmitted (transmission bit series). For example, the data “00011111010110100” is divided into two bits such as “00”, “01”, “11”, “10”, “10”, “11”, “01”, “00”. A bit string to be assigned to each subcarrier is generated. Next, the signal point mapper 102 converts the generated bit sequences of “00”, “01”, “11”, and “10” into signal points in a complex region corresponding to quadrature amplitude modulation (QAM). To map. The QAM signal point data is assigned to the input unit of the wavelet inverse transform 103 as shown by T2. At this time, the complex signal point data is divided into a real part and an imaginary part. The wavelet inverse transform 103 performs wavelet inverse transform on each of the real part and the imaginary part using the two signal point data assigned as in T2, and outputs a sample value of the transmission waveform on the time axis in one symbol period. To do. At this time, the sample value of the transmission waveform remains a complex number. The quadrature modulator 108 performs frequency shift to an arbitrary carrier band by performing quadrature modulation on the complex signal. The D / A converter 104 outputs the frequency-shifted time sample value at a constant sampling time. The transmission amplifier 105 amplifies the transmission waveform to an appropriate level, and the band pass filter 106 removes unnecessary frequency components. The power line coupling circuit 121 outputs the signal shaped by the band pass filter 106 to the power line 110 as a power line communication signal. The above is the description of the data flow at the time of transmission.
[0070]
Next, the data flow of the reception unit 111 will be described with reference to FIG.
[0071]
First, the power line coupling circuit 121 extracts a power line communication signal from the power line 110. The band pass filter 112 removes an out-of-band noise signal from the signal extracted by the power line coupling circuit 121 and outputs it to the amplification degree controller 113. The amplification degree controller 113 adjusts the signal level so as to be within the dynamic range of the A / D converter 114, and the A / D converter 114 samples this signal waveform at the same timing as the sampling timing on the transmission side. And digitize. The quadrature demodulator 118 down-converts the waveform data into a baseband band and converts it into a complex baseband signal. The wavelet transform 115 performs wavelet transform on the complex waveform data to obtain complex signal point data for each subcarrier. The symbol determiner 116 reverse-maps this signal point data, restores it to the bit string considered to be the closest, and obtains received data. The above is the description of the data flow at the time of reception.
[0072]
This configuration eliminates the need for redundant signal portions called guard intervals, which are necessary in the OFDM transmission system, and improves frequency utilization efficiency. Further, since the signal point data in the complex domain can be used by orthogonal modulation / demodulation, the frequency utilization efficiency is further improved.
[0073]
(Embodiment 4)
The configuration of the power line carrier communication apparatus according to Embodiment 4 of the present invention is the configuration shown in FIG. 3, FIG. 6, or FIG. In the present embodiment, a case will be described in which the wavelet inverse transform 103 and the wavelet transform 115 are configured by generalized overlapped orthogonal transform (GLT). GLT is a generalization of the structure of overlapped orthogonal transform (LOT) with respect to the number of taps of a filter.
[0074]
FIG. 10A is a graph showing an example of the impulse response of each filter of the filter bank circuit that realizes GLT with four-part perfect reconstruction, and FIG. 10B realizes GLT with four-part perfect reconstruction. It is a graph which shows the example of the frequency response of each filter of the filter bank circuit to do.
[0075]
In the present embodiment, the filter bank circuit that realizes the GLT is configured by the FIR filter group, but can also be configured by a polyphase filter or a lattice structure. In addition, although an example of a filter bank circuit that realizes a GLT with complete reconstruction has been shown, a filter bank circuit with pseudo complete reconstruction can also be applied. By employing pseudo-complete reconstruction, it is possible to further reduce the side lobes in each subcarrier than in the case of complete reconstruction.
[0076]
By configuring the filter bank circuit as shown in FIG. 10, it is possible to have linear phase characteristics for all the filters of the filter bank circuit that realizes the wavelet transform. Since all the filters have linear phase characteristics, the number of multipliers required for the filter bank can be halved, and the circuit scale can be reduced. Further, since the frequency characteristics of each subcarrier can be designed steeply around the main lobe, it is possible to reduce the influence of interference from other subcarriers and noise outside the band during reception.
[0077]
(Embodiment 5)
The configuration of the power line carrier communication apparatus according to the fifth embodiment of the present invention is the configuration shown in FIG. 3, FIG. 6, or FIG. In the present embodiment, a case will be described in which the wavelet inverse transform 103 and the wavelet transform 115 are configured by extended modulated overlapped orthogonal transform (ELT). ELT is a generalized MLT (Modulated Lapped Transform) configuration with respect to the number of filter taps.
[0078]
FIG. 11A is a graph showing an example of an impulse response of each filter of the filter bank circuit that realizes the 4-part ELT, and FIG. 11B shows a graph of each filter of the filter bank circuit that realizes the 4-part ELT. It is a graph which shows the example of a frequency response.
[0079]
In the present embodiment, the filter bank circuit for realizing ELT is configured by the FIR filter group, but can also be configured by a polyphase filter or a lattice structure.
[0080]
By configuring a filter bank circuit having filter coefficients as shown in FIG. 11, the side lobes of each subcarrier can be further reduced as compared with the LOT or GLT described in the fourth embodiment. Since the frequency characteristics of each subcarrier can be designed steeply around the main lobe, the band rejection filter required in the conventional method is not required for the purpose of preventing the existing system from being affected in the power line carrier communication apparatus 100, During reception, it is possible to reduce the influence of interference from other subcarriers and noise outside the band.
[0081]
(Embodiment 6)
In the sixth embodiment of the present invention, the case where the wavelet inverse transform 103 and the wavelet transform 115 constituting the power line carrier communication apparatus 100 of FIGS. 3, 6, and 7 are configured by polyphase filters is shown in FIGS. It explains using. FIG. 12A is a block diagram showing a band synthesis filter bank circuit configured with a general FIR filter, and FIG. 12B is a block diagram showing a band division filter bank circuit configured with a general FIR filter. FIG. 13A is a block diagram showing a band synthesis filter bank circuit constituted by a polyphase filter, and FIG. 13B is a block diagram showing a band division filter bank circuit constituted by a polyphase filter.
[0082]
First, the configuration of a filter bank circuit composed of a general FIR filter will be described with reference to FIG. In FIG. 12, 201 is an upsampler for increasing the sampling rate of a signal N times, 202 is an FIR filter, 203 is an FIR filter group combining a plurality of FIR filters 202 orthogonal to each other, and 204 is a two-input adder. As described above, the band synthesis filter bank circuit 200 as the wavelet inverse transform 103 is configured.
[0083]
Reference numeral 211 denotes an FIR filter, 212 denotes an FIR filter group in which a plurality of FIR filters 211 orthogonal to each other is combined, and 213 denotes a downsampler that makes the sampling rate 1 / N. As described above, the band division filter bank circuit 210 as the wavelet transform 115 is configured.
[0084]
The FIR filters 202 and 211 constituting the FIR filter group 203 of the wavelet inverse transform 103 and the FIR filter group 212 of the wavelet transformer 210 delay the input signal to the wavelet transform 115 and the output signal of the wavelet transform 115. It is comprised so that it may correspond except. For example, (Table 1) and (Table 2) are listed as filter coefficients that satisfy this condition.
[0085]
[Table 1]
[0086]
[Table 2]
[0087]
The filter coefficients shown in Table 1 and Table 2 are examples of filter bank circuits that divide the band into four. Here, h represents a general FIR filter. The FIR filter has seven delay elements connected in cascade to delay input data, eight multipliers that multiply the output data of the delay elements and the input data by a coefficient, and the output data of the multiplier. It consists of seven adders that add up sequentially from the side to obtain the accumulated value. tap represents the multiplier, and α represents a coefficient of the multiplier. In addition, M of αMN indicates a filter number, and N indicates a tap number.
[0088]
Next, a filter bank circuit composed of polyphase filters will be described with reference to FIG. In FIG. 13, 301 is a polyphase filter, 302 is an upsampler that multiplies the sampling rate of the signal by N, 303 is a two-input adder, and 304 is a delay element (register) that delays by one sampling. As described above, the band synthesis filter bank circuit 300 as the wavelet inverse transform 103 is configured.
[0089]
Reference numeral 311 denotes a delay element that delays by one sampling, 312 denotes a downsampler that makes the sampling rate 1 / N, and 313 denotes a polyphase filter. As described above, the band division filter bank circuit 310 as the wavelet transform 115 is configured.
[0090]
FIG. 14 is a block diagram showing the polyphase filters 301 and 313 in FIG. In FIG. 14, reference numeral 321 denotes a filter, and 322 denotes a two-input adder. The filters constituting the polyphase filter 301 and the polyphase filter 313 are configured such that the input signal to the band synthesis filter bank circuit 300 and the output signal of the band division filter bank circuit 310 match except for delay. ing. For example, each polyphase filter may be configured as shown in (Table 3) to (Table 10) so as to be the same as the calculation results based on the filter coefficients in (Table 1) and (Table 2).
[0091]
[Table 3]
[0092]
[Table 4]
[0093]
[Table 5]
[0094]
[Table 6]
[0095]
[Table 7]
[0096]
[Table 8]
[0097]
[Table 9]
[0098]
[Table 10]
[0099]
The difference between the filter bank circuit of FIG. 12 and the filter bank circuit of FIG. 13 is that the sampling rate is changed. In the band synthesis filter bank circuits 200 and 300, in FIG. 12, the signal is up-sampled before being input to the filter, but in FIG. 13, it is up-sampled after the filter operation. On the other hand, in the band division filter bank circuits 210 and 310, downsampling is performed after the filter operation in FIG. 12, and downsampling is performed before the filter operation in FIG. That is, the filter operation in FIG. 13 can be executed at a slower speed than in FIG.
[0100]
In this embodiment, the filter output timing control unit of the band synthesis filter bank is configured by using the upsampler 302, the two-input adder 303, and the delay element 304, but can also be configured by a multiplexer.
[0101]
Therefore, with this configuration, it is possible to execute the calculation at the time of overlapping orthogonal transformation at the time of modulation and demodulation at a low rate. That is, since the operation clock frequency can be lowered, the power consumption of the circuit can be reduced. In addition, from the viewpoint of reducing the amount of calculation per unit time, this makes it possible to use an arithmetic unit and reduce the circuit scale.
[0102]
(Embodiment 7)
15A is a block diagram showing a band synthesis filter bank circuit as the wavelet inverse transform 103 of the power line carrier communication apparatus 100 of FIGS. 3, 6 and 7, and FIG. 15B is a block diagram of FIG. FIG. 8 is a block diagram showing a band-division filter bank circuit as the wavelet transform 115 of the power line carrier communication apparatus 100 of FIG. 7, and shows a lattice structure ELT filter bank circuit as the filter bank circuit. That is, in this embodiment, a case will be described in which the wavelet inverse transform 103 and the wavelet transform 115 are configured by a lattice-structure filter bank circuit.
[0103]
In FIG. 15, 401 is a type IV discrete cosine transform (DCT) unit, 402 is a delay element that delays by one sampling, 403 is a plane rotation calculator, 404 is a delay element that delays by two samplings, and 405 is a signal. An up-sampler that multiplies the sampling rate by N times, 406 is a two-input adder, and 407 is a delay element that delays one sampling. As described above, the band synthesis filter bank circuit 400 is configured. On the other hand, 411 is a delay element that delays by one sampling, 412 is a downsampler that makes the sampling rate 1 / N, 413 is a delay element that delays by two samplings, 414 is a plane rotation calculator, and 415 is delayed by one sampling The delay element 416 is a type IV discrete cosine transformer. As described above, the band division filter bank circuit 410 is configured. The plane rotation calculators 403 and 414 are configured by combining a plurality of plane rotation calculation circuits shown in FIG. FIG. 16 is a functional block diagram showing a plane rotation arithmetic circuit.
[0104]
With this configuration, similarly to the case of the polyphase filter described in the sixth embodiment, it is possible to reduce the calculation rate at the time of the orthogonal orthogonal transform at the time of modulation and demodulation. Furthermore, since the amount of calculation can be reduced by using a high-speed DCT together, the power consumption and circuit scale of the circuit can be reduced.
[0105]
(Embodiment 8)
In the eighth embodiment of the present invention, the wavelet inverse transform 103 of the power line carrier communication apparatus 100 of FIGS. 3, 6, and 7 and the wavelet transform 115 of the power line carrier communication apparatus 100 of FIGS. A method of preparing a plurality of filter coefficients corresponding to the coefficients and changing the filter coefficients will be described.
[0106]
First, for the wavelet inverse transform 103 of the transmission unit 101 and the wavelet transform 115 of the reception unit 111, a plurality of patterns of filter coefficients having different filter lengths corresponding to the overlap coefficients are prepared. Then, by specifying the filter pattern number for the wavelet inverse transform 103 and the wavelet transform 115 from the control unit 122 of the transmission unit 101 and the reception unit 111, the filter coefficient in the filter bank circuit is set according to the pattern number. Change. At this time, the pattern number of the filter needs to be matched between the transmission side and the reception side using a control signal or the like. In addition, as a reference for changing the filter coefficient, a power line communication signal transmitted from the transmission unit 101, a transmission path variation, a reception level, and the like can be considered. For example, when S / N (signal power to noise power ratio) is used, if the S / N is large at the time of reception, the out-of-band noise is small when viewed from each subcarrier. When the S / N is small, a filter coefficient having a large filter length is used to make it less susceptible to noise from other bands.
[0107]
With this control, it is possible to reduce the amount of computation when the noise state of the transmission path is good, and it is possible to reduce power consumption during reception. In addition, even when the noise state is poor, stable reception can be performed.
[0108]
(Embodiment 9)
In the ninth embodiment of the present invention, when the wavelet inverse transform 103 and the wavelet transform 115 shown in FIGS. 3, 6, and 7 are configured in a lattice structure, a plurality of plane rotation angle parameters corresponding to the overlap coefficient are prepared. A method for changing the plane rotation angle parameter will be described.
[0109]
First, the wavelet inverse transform 103 of the transmitting unit 101 and the wavelet transform 115 of the receiving unit 111 are configured in a lattice structure as in the seventh embodiment. A plurality of patterns of plane rotation angle parameters corresponding to the overlap coefficient are prepared for the wavelet inverse transform 103 of the transmission unit 101 and the wavelet transform 115 of the reception unit 111. Then, by specifying the pattern number of the plane rotation angle parameter for the wavelet inverse transform 103 and the wavelet transform 115 from the control unit 122 of the transmission unit 101 and the reception unit 111, the filter bank circuit is matched to the pattern number. The plane rotation angle parameter of is changed. At this time, the pattern number of the plane rotation angle parameter needs to be matched between the transmitter and the receiver using a control signal or the like. In addition, as a reference for changing the plane rotation angle parameter, a power line communication signal transmitted from the transmission unit 101, a transmission path variation, a reception level, and the like can be considered. For example, when S / N is used, when S / N is large at the time of reception, since the noise outside the band is small when viewed from each subcarrier, the demodulation operation is performed with the plane rotation angle parameter having a small overlap coefficient. When N is small, a plane rotation angle parameter having a large overlap coefficient is used to make it less susceptible to noise from other bands.
[0110]
With this control, it is possible to reduce the amount of calculation when the noise environment of the transmission path is good, and it is possible to reduce power consumption during reception. In addition, even when the noise state is poor, stable reception can be performed. Furthermore, the storage capacity can be reduced compared to the case where a plurality of filter coefficient patterns are prepared as in the eighth embodiment.
[0111]
(Embodiment 10)
FIG. 17 is an explanatory diagram for explaining a control method of the power line carrier communication apparatus according to the tenth embodiment of the present invention (that is, the operation of the control unit 122 in FIG. 3, FIG. 6 or FIG. 7). Then, the case where only a specific subcarrier is output is demonstrated. For simplicity of explanation, the number of subcarriers is four.
[0112]
In FIG. 17, reference numeral 102 denotes a signal point map, 103 denotes a wavelet inverse transform, and 122 denotes a control unit.
[0113]
First, in the signal point mapper 102, the signal point map in the order of “+1”, “+3”, “−3”, “−1”, “+1”, “+3”, “−3”, “−1”. Suppose that the processed data is output. At this time, the control unit 122 designates a subcarrier number that is not used for the signal point mapper 102, so that data is not input to the subcarrier portion of the designated number. That is, zero is inserted. For example, when the first and fourth subcarriers are not output, zero is inserted in the input portion of the filter that outputs the first and fourth subcarriers, and the mapped signal point data is 2 Put in the input part of the 3rd and 3rd subcarriers. The wavelet inverse transform 103 performs wavelet inverse transform based on each input data.
[0114]
By controlling in this way, it is possible to easily select a subcarrier to be output, and it is possible to output a signal only at a specific frequency. That is, even if the frequency band that can be used varies from country to country due to country-specific laws and regulations, it is possible to easily cope with the problem.
[0115]
Further, the effectiveness of the power line carrier communication apparatus according to the present embodiment will be described in an easy-to-understand manner with reference to FIG. 18, FIG. 19, and FIG. 18 is a graph showing an example of a frequency spectrum approved for power line carrier communication, FIG. 19 is a graph showing a transmission frequency spectrum when OFDM transmission is used, and FIG. 20 shows a transmission frequency spectrum of the power line carrier communication apparatus. It is a graph.
[0116]
For example, assume that frequency allocation according to the laws and regulations of a certain country is as shown in FIG. A transmission signal by a conventional power line communication carrier apparatus using OFDM is as shown in FIG. 19, and a separate band rejection filter is required to satisfy the regulation of FIG. In other words, it is necessary to prepare filter coefficients for different band rejection filters for each country. On the other hand, the power line carrier communication apparatus according to the present embodiment can obtain a transmission signal spectrum as shown in FIG. 20 only by the operation in the present embodiment, and therefore does not require a band rejection filter. From this, the power line carrier communication apparatus according to the present embodiment can flexibly cope with different laws and regulations in each country.
[0117]
(Embodiment 11)
FIG. 21 is an explanatory diagram for explaining the control method of the power line carrier communication apparatus of FIG. 3, FIG. 6, and FIG. 7 (that is, the operation of the control unit 122 of the power line carrier communication apparatus according to the eleventh embodiment of the present invention). . In the present embodiment, a method for detecting a noise level on a power line will be described.
[0118]
In FIG. 21, 115 is a wavelet transform, 116 is a symbol determiner, and 122 is a control unit.
[0119]
Next, the noise level detection operation on the power line will be described.
[0120]
First, the wavelet transform 115 demodulates signal point data for each subcarrier in order to detect the frequency distribution of noise on the power line 110. Next, the symbol determiner 116 measures which signal point is present near the noise component based on the signal point data for each subcarrier. At this time, if there is no noise at all, the signal point data in each subcarrier is all zero. Therefore, the amount of noise is estimated based on how much the value of this data deviates from 0. Then, the symbol determiner 116 determines a subcarrier whose noise is larger than a desired value, notifies the control unit 122 of the subcarrier number, and prevents the control unit 122 from using the subcarrier.
[0121]
In the present embodiment, the noise level detection method in a state in which no signal is superimposed on the power line has been described. However, a similar method can be realized even if a known signal is used between transmission and reception. That is, noise detection can be performed even in a communication state.
[0122]
By performing such control, the noise state on the power line can be grasped, and usable subcarriers can be selected. By selecting a subcarrier in advance so as to avoid a frequency position where a large noise component exists in the control unit 122, communication with higher reliability is possible.
[0123]
(Embodiment 12)
As a control method in the power line carrier communication apparatus according to the twelfth embodiment of the present invention, a control method for changing the transmission speed to the designated speed will be described with reference to FIGS.
[0124]
First, control section 122 calculates the number of signal points and the number of subcarriers necessary for realizing a transmission rate designated from the outside, and the calculation result and the determination result of usable subcarriers according to the eleventh embodiment. Based on the subcarrier selection. Next, the control unit 122 designates the subcarrier number to be used and the number of signal points to the signal point mapper 102. The signal point mapper 102 associates signal point mapping and data arrangement processing to subcarriers according to the set value.
[0125]
For example, it is assumed that a necessary transmission rate is designated from the outside, and the result calculated to match the transmission rate designated by the control unit 122 is 2 carriers and 4 signal points. Furthermore, it is assumed that the number of usable subcarriers is three other than the second subcarrier in the determination according to the eleventh embodiment. At this time, the control unit 122 can select, for example, the first and third subcarriers. Also, other unused subcarriers (fourth carrier in this example) can be used for another communication.
[0126]
By controlling in this way, the transmission rate can be easily changed to a designated rate, and subcarriers other than realizing the designated transmission rate can be used for another communication. It is possible to improve the use efficiency of the.
[0127]
(Embodiment 13)
FIG. 22 is a flowchart showing the operation of the control unit 122 of the power line carrier communication apparatus according to Embodiment 13 of the present invention. In the present embodiment, when an error occurs in received data during normal communication, the power line carrier communication device 1 (for example, the own device) and the power line carrier communication device are shifted while shifting the frequency position for transmission and avoiding the influence of noise. A method for matching communication procedures between two (for example, counterpart devices) will be described. The power line carrier communication device 1 and the power line carrier communication device 2 are configured as shown in FIG.
[0128]
22, in the initial state (S11, S21), communication between the power line carrier communication device 1 and the power line carrier communication device 2 is performed using the carrier pattern 1. Then, in the power line carrier communication apparatus 1, when the number of errors exceeds a certain threshold (S12), a subcarrier exceeding the certain threshold is detected (S13), and the subcarrier to be changed is detected. A carrier number or position is temporarily set (S14). The carrier pattern changed at this time is referred to as carrier pattern 2. Thereafter, the contents of the set carrier pattern 2 are transmitted to the power line carrier communication device 2 using the carrier pattern 1 used for the current communication (S15). Thereafter, the power line carrier communication apparatus 1 changes its own carrier pattern to the carrier pattern 2. The carrier pattern consists of one subcarrier or a set of subcarriers.
[0129]
The power line carrier communication apparatus 2 that has received the contents of the carrier pattern 2 in the carrier pattern 1 determines whether or not the carrier pattern is changed (S22). If not changed, the process returns to the normal process (S21). For example, the frequency position to which overlap orthogonal transformation is applied by the receiving unit 111 is changed to the carrier pattern 2 (S23), and the change of the carrier pattern is further modulated by the carrier pattern 2 and returned to the power line carrier communication apparatus 1 (S24).
[0130]
The power line carrier communication apparatus 1 determines that the content of the completion notification has been sent correctly (S16). Therefore, when the change completion notification is correctly received, the process proceeds to the normal processing (S11). However, when the change completion notification is not received, the S / N threshold is changed (S17), and the carrier pattern is again obtained. The process proceeds to the selection process (S13). Then, the carrier pattern change sequence is performed again. This series of sequences is repeated until the number of errors is reduced.
[0131]
Here, the sequence can be used not only for normal communication but also for initial installation settings.
[0132]
In the present embodiment, the number of reception errors is reduced by changing the subcarrier to be used. However, the number of errors can be reduced by changing the signal point arrangement of the signal point mapper. . For example, as shown in FIG. 23, the quaternary signal point arrangement may be changed to two arrangement methods, and communication consistency can be realized by means similar to the sequence in the present embodiment. Here, FIGS. 23A and 23B are explanatory diagrams showing changes in the number of signal points of the signal point mapper 102 of the power line carrier communication apparatus.
[0133]
As described above, according to the present embodiment, the number of reception errors can be reduced because subcarriers having a low error rate are preferentially used for communication.
[0134]
(Embodiment 14)
FIG. 24 is a flowchart showing the operation of the power line carrier communication apparatus according to the fourteenth embodiment of the present invention. Based on the reception result of the power line carrier communication apparatus 2 (for example, the counterpart apparatus), the power line carrier communication apparatus 1 (for example, the own apparatus). The operation to change the transmission output level is shown. In addition, the structure of the power line carrier communication apparatus 1 and the power line carrier communication apparatus 2 is a structure of FIG.
[0135]
In FIG. 24, in the initial state (S31), the power line carrier communication apparatus 1 transmits at a certain output level. The power line carrier communication device 2 receives the signal from the power line carrier communication device 1 (S41), and measures the S / N for each subcarrier (S42). Next, the power line carrier communication device 1 is requested to change the output level based on the average S / N value (S43).
[0136]
The power line carrier communication apparatus 1 that has received the S / N value and the change request determines whether or not there is a change request (S32), calculates backward from the S / N value (S33), and determines the output level (S34). Then, it transmits again to the power line carrier communication device 2 at that level.
[0137]
With this operation, when the noise level on the power line is low and no communication error occurs, the power required for transmission can be reduced by reducing the output level.
[0138]
As described above, according to the present embodiment, when the noise level on the power line is low and no communication error occurs, the output level can be lowered, so that the power required for transmission can be reduced.
[0139]
【The invention's effect】
  As described above, according to the power line carrier communication apparatus of the first aspect of the present invention, the transmission unit, the reception unit, and the signal from the transmission unit are superimposed on the power line as a power line communication signal and the power line A power line carrier communication device that includes a power line coupling circuit that extracts only a signal for power line communication from a control unit and a control unit that controls each component of the transmission unit and the reception unit, and performs communication using a plurality of subcarriers. The transmission unit generates a plurality of bit sequences from input transmission data and maps the bit sequences to signal points of each subcarrier, and each sub-map mapped by the signal point mapper. A wavelet inverse transformer that generates time waveform series data by modulating each subcarrier with orthogonal wavelet waveforms based on carrier signal point data; A D / A converter for analog-converting time waveform series data by the wavelet inverse converter, and the receiving unit digitally converts a power line communication signal extracted from a power line by the power line coupling circuit to obtain a sampling series An A / D converter that obtains waveform data, a wavelet converter that converts sampling series waveform data from the A / D converter into signal point data of each subcarrier, and a plurality of signal points that are output from the wavelet converter A symbol determiner that reversely maps the data, discriminates the bit string mapped by the signal point mapper, and synthesizes it as a received data sequence;The wavelet inverse transformer and the wavelet transformer have a plurality of filter coefficient patterns having different filter lengths according to the overlap coefficient, and power line communication signals transmitted from the transmission unit, transmission path fluctuations, reception levels A power line carrier communication device, wherein an appropriate filter coefficient pattern is selected from the plurality of filter coefficient patterns according to reception conditions such asThis eliminates the need for redundant signal parts such as guard intervals, which were necessary in the OFDM transmission method, and improves frequency utilization efficiency. Also, Fourier transforms that require complex operations can be performed only in real part operations. Since this is realized by the wavelet transform performed in step (b), the amount of calculation can be reduced, and the circuit scale can be reduced. In addition, communication is possible even if the guard interval that causes transmission speed degradation is eliminated, and the band rejection filter that limits the frequency band used for communication according to the radio wave regulations of each country and causes an increase in circuit scale It is possible to obtain a sufficient amount of attenuation in the use band of the existing system without installing the.Furthermore, the amount of calculation when the noise state of the transmission path is good can be reduced, power consumption at the time of reception can be reduced, and stable reception can be performed even when the noise state is poor. The advantageous effect that it can be obtained.
[0140]
  According to the power line carrier communication apparatus according to claim 2, the signal from the transmission unit, the reception unit, and the transmission unit is superimposed on the power line as a power line communication signal, and only the power line communication signal is extracted from the power line. Power line coupling circuit, a control unit that controls each component of the transmission unit and the reception unit, and a power line carrier communication device that performs communication using a plurality of subcarriers, the transmission unit, A signal point mapr that generates a plurality of bit sequences from input transmission data and maps the bit sequences to signal points of each subcarrier, and a signal point map of each subcarrier mapped by the signal point maper. Wavelet inverse transformer that generates time waveform series data by modulating each subcarrier with orthogonal wavelet waveforms, and the wavelet inverse transform A frequency converter for transmission that shifts the time waveform series data output from the frequency carrier to an arbitrary carrier frequency band, and a D / A converter that converts the time waveform series data output from the frequency converter for transmission analog to analog And an A / D converter that digitally converts a power line communication signal extracted from a power line by the power line coupling circuit to obtain sampling series waveform data, and a sampling series waveform by the A / D converter. A receiving frequency converter that obtains a baseband signal sequence by frequency shifting data to the baseband band, and a wavelet transform that converts the baseband signal sequence output from the receiving frequency converter into signal point data of each subcarrier. And a plurality of signal point data output from the wavelet transformer to inversely map the signal point map Yes a symbol decision unit for synthesizing the bit string mapped by vessel as determined received data sequenceThe wavelet inverse transformer and the wavelet transformer have a plurality of filter coefficient patterns having different filter lengths according to the overlap coefficient, and power line communication signals transmitted from the transmission unit, transmission path fluctuations, reception levels A power line carrier communication device, wherein an appropriate filter coefficient pattern is selected from the plurality of filter coefficient patterns according to reception conditions such asThis eliminates the need for redundant signal parts such as guard intervals, which were necessary in the OFDM transmission method, and improves frequency utilization efficiency. Also, Fourier transforms that require complex operations can be performed only in real part operations. Since this is realized by the wavelet transform performed in step (b), the amount of calculation can be reduced, and the circuit scale can be reduced. In addition, communication is possible even if the guard interval that causes transmission speed degradation is eliminated, and the band rejection filter that limits the frequency band used for communication according to the radio wave regulations of each country and causes an increase in circuit scale It is possible to obtain a sufficient amount of attenuation in the use band of the existing system without installing the. Furthermore, since it is possible to shift to an arbitrary frequency band, for example, it is possible to easily cope with the case where the frequency bands that can be used in and outside the house are different in each country, rather than only using the baseband transmission method. The circuit scale can be further suppressed.Furthermore, the amount of calculation when the noise state of the transmission path is good can be reduced, power consumption at the time of reception can be reduced, and stable reception can be performed even when the noise state is poor. The advantageous effect that it can be obtained.
[0141]
  According to the power line carrier communication device of claim 3, the signal from the transmission unit, the reception unit, and the transmission unit is superimposed on the power line as a power line communication signal and only the power line communication signal is extracted from the power line. Power line coupling circuit, a control unit that controls each component of the transmission unit and the reception unit, and a power line carrier communication device that performs communication using a plurality of subcarriers, the transmission unit, A signal point mapper that generates a plurality of bitstreams from input transmission data and maps the bitstreams to complex signal points of each subcarrier, and complex signal point data of each subcarrier mapped by the signal point mapper. A wavelet inverse transformer for generating complex time waveform series data by modulating each subcarrier with wavelet waveforms orthogonal to each other, and the wave A quadrature modulator that shifts the complex time waveform sequence data output from the inverse converter to an arbitrary carrier frequency band by orthogonal modulation, and analog conversion of the complex time waveform sequence data output from the quadrature modulator A D / A converter that performs digital conversion of a power line communication signal extracted from a power line by the power line coupling circuit to obtain sampling series waveform data; and A quadrature demodulator that obtains a baseband signal sequence by frequency-shifting sampling sequence waveform data by the D / D converter to a baseband band, and a baseband signal sequence output from the quadrature demodulator as signal point data of each subcarrier The wavelet transformer to be converted and a plurality of signal point data output from the wavelet transformer Yes a symbol decision unit for determine a bit sequence mapped in the signal point mappers synthesis as received data sequenceThe wavelet inverse transformer and the wavelet transformer have a plurality of filter coefficient patterns having different filter lengths according to the overlap coefficient, and power line communication signals transmitted from the transmission unit, transmission path fluctuations, reception levels A power line carrier communication device, wherein an appropriate filter coefficient pattern is selected from the plurality of filter coefficient patterns according to reception conditions such asThis eliminates the need for redundant signal parts such as guard intervals, which were necessary in the OFDM transmission method, and improves frequency utilization efficiency. Also, Fourier transforms that require complex operations can be performed only in real part operations. Since this is realized by the wavelet transform performed in step (b), the amount of calculation can be reduced, and the circuit scale can be reduced. In addition, communication is possible even if the guard interval that causes transmission speed degradation is eliminated, and the band rejection filter that limits the frequency band used for communication according to the radio wave regulations of each country and causes an increase in circuit scale It is possible to obtain a sufficient amount of attenuation in the use band of the existing system without installing the. Further, since signal point data in the complex region can be used by orthogonal modulation / demodulation, the frequency utilization efficiency can be further improved.Furthermore, the amount of calculation when the noise state of the transmission path is good can be reduced, power consumption at the time of reception can be reduced, and stable reception can be performed even when the noise state is poor. The advantageous effect that it can be obtained.
[0142]
According to the power line carrier communication apparatus according to claim 4, in the power line carrier communication apparatus according to any one of claims 1 to 3, the wavelet inverse transformer and the wavelet transformer are completely reconfigured or pseudo-completely reconfigured. Since it has a linear phase characteristic for all the filters of the filter bank circuit that realizes the wavelet transform, the number of multipliers necessary for the filter bank can be obtained. Can be halved, and an advantageous effect that the circuit scale can be reduced can be obtained. In addition, since the frequency characteristics of each subcarrier can be designed steeply around the main lobe, an advantageous effect is obtained in that the influence of interference from other subcarriers and noise outside the band can be reduced during reception. .
[0143]
According to the power line carrier communication apparatus according to claim 5, in the power line carrier communication apparatus according to any one of claims 1 to 3, the wavelet inverse transformer and the wavelet transformer have a modulation overlap conversion function or an extended modulation overlap. By having the conversion function, the filter frequency characteristics of each subcarrier can be designed more steeply with the main lobe as the center, so it was necessary in the past to prevent the existing system from being affected in the power line carrier communication device. Thus, an advantageous effect is obtained that the influence of interference from other subcarriers and noise outside the band can be reduced at the time of reception without the need for a band rejection filter.
[0144]
According to the power line carrier communication device according to claim 6, in the power line carrier communication device according to any one of claims 1 to 5, the wavelet inverse transformer and the wavelet transformer are configured by a polyphase filter bank circuit. As a result, it is possible to perform calculations at the time of duplicating orthogonal transform at the time of modulation and demodulation at a low rate, and it is possible to reduce the operating clock frequency, which is advantageous in that the power consumption of the circuit can be reduced. An effect is obtained. Further, since the operation clock frequency can be lowered, it is possible to divert the arithmetic unit and to obtain an advantageous effect that the circuit scale can be reduced.
[0145]
  According to the power line carrier communication apparatus of claim 7,A transmission unit, a reception unit, a power line coupling circuit that superimposes a signal from the transmission unit on a power line as a power line communication signal and extracts only the power line communication signal from the power line, and the transmission unit and the reception unit A power line carrier communication device that performs communication using a plurality of subcarriers, wherein the transmission unit generates a plurality of bit strings from input transmission data, and A signal point mapper that maps a bit string to a signal point of each subcarrier, and modulation of each subcarrier with wavelet waveforms orthogonal to each other based on the signal point data of each subcarrier mapped by the signal point mapper Wavelet inverse transformer for generating time waveform series data, and analog conversion of time waveform series data by the wavelet inverse transformer An A / D converter, and the receiving unit digitally converts a power line communication signal extracted from a power line by the power line coupling circuit to obtain sampling series waveform data, and the A / D converter Wavelet converter for converting sampling series waveform data by converter to signal point data of each subcarrier, and a plurality of signal point data output from said wavelet converter are inversely mapped and mapped by said signal point mapper A symbol discriminator that discriminates a bit string and combines it as a received data sequence;The wavelet inverse transformer and the wavelet transformer are configured by a lattice bank filter bank circuit.The wavelet inverse transformer and the wavelet transformer further have a plurality of plane rotation angle patterns corresponding to overlapping coefficients, and power line communication signals transmitted from the transmission unit, transmission path fluctuations, reception levels, etc. An appropriate plane rotation angle parameter is selected from the plurality of plane rotation angle parameters according to the reception condition of the power line carrier communication deviceByA wavelet transform that eliminates the need for redundant signal parts called guard intervals, which was necessary in the OFDM transmission system, improves frequency utilization efficiency, and performs Fourier transform that requires complex operations only with real part operations. Therefore, the amount of calculation can be reduced and the circuit scale can be reduced. In addition, communication is possible even if the guard interval that causes transmission speed degradation is eliminated, and the band rejection filter that limits the frequency band used for communication according to the radio wave regulations of each country and causes an increase in circuit scale An advantageous effect is obtained that a sufficient amount of attenuation can be obtained in the use band of the existing system without installing the.
  furtherSince the operation at the time of the orthogonal orthogonal transformation at the time of modulation and demodulation can be executed at a low rate and the operation clock frequency can be lowered, the power consumption of the circuit can be reduced. In addition, since the amount of calculation can be reduced by using a high-speed DCT together, an advantageous effect that the power consumption and circuit scale of the circuit can be reduced can be obtained.
  Furthermore, the amount of calculation when the noise state of the transmission path is good can be reduced, power consumption at the time of reception can be reduced, and stable reception can be performed even when the noise state is poor. Has the effect of being able to. Further, there is no need to prepare a plurality of filter coefficient patterns, and an advantageous effect that the storage capacity can be reduced is obtained.
[0147]
  Claim8According to the power line carrier communication device described inA transmission unit, a reception unit, a power line coupling circuit that superimposes a signal from the transmission unit on a power line as a power line communication signal and extracts only the power line communication signal from the power line, and the transmission unit and the reception unit A power line carrier communication device that performs communication using a plurality of subcarriers, wherein the transmission unit generates a plurality of bit strings from input transmission data, and A signal point mapper that maps a bit string to a signal point of each subcarrier, and modulation of each subcarrier with wavelet waveforms orthogonal to each other based on the signal point data of each subcarrier mapped by the signal point mapper Wavelet inverse transformer for generating time waveform series data, and arbitrary time waveform series data output from the wavelet inverse transformer. A transmission frequency converter that shifts the frequency to a wave frequency band; and a D / A converter that analog-converts time waveform series data output from the transmission frequency converter, wherein the reception unit is connected to the power line An A / D converter that digitally converts a power line communication signal extracted from a power line by a circuit to obtain sampling series waveform data, and a base frequency band obtained by shifting the sampling series waveform data by the A / D converter to a baseband band. A receiving frequency converter for obtaining a band signal sequence, a wavelet converter for converting the baseband signal sequence output from the receiving frequency converter into signal point data of each subcarrier, and an output from the wavelet converter Receiving data system by inversely mapping a plurality of signal point data and discriminating the bit string mapped by the signal point mapper The wavelet inverse transformer and the wavelet transformer are configured by a lattice-structure filter bank circuit, and the wavelet inverse transformer and the wavelet transformer are further converted into overlapping coefficients. A plurality of plane rotation angle patterns corresponding to the power line communication signal transmitted from the transmitter, transmission path variation, reception conditions such as reception level, and the like. Power line carrier communication apparatus characterized by selecting a plane rotation angle parameterByA wavelet transform that eliminates the need for redundant signal parts called guard intervals, which was necessary in the OFDM transmission system, improves frequency utilization efficiency, and performs Fourier transform that requires complex operations only with real part operations. Therefore, the amount of calculation can be reduced and the circuit scale can be reduced. In addition, communication is possible even if the guard interval that causes transmission speed degradation is eliminated, and the band rejection filter that limits the frequency band used for communication according to the radio wave regulations of each country and causes an increase in circuit scale It is possible to obtain a sufficient amount of attenuation in the use band of the existing system without installing the. Furthermore, since it is possible to shift to an arbitrary frequency band, for example, it is possible to easily cope with the case where the frequency bands that can be used in and outside the house are different in each country, rather than only using the baseband transmission method. The advantageous effect that the circuit scale can be further reduced is obtained.
  In addition, the operation at the time of modulation and demodulation can be performed at a low rate and the operation clock frequency can be lowered, so that the power consumption of the circuit can be reduced. . In addition, since the amount of calculation can be reduced by using a high-speed DCT together, an advantageous effect that the power consumption and circuit scale of the circuit can be reduced can be obtained.
  further,The amount of computation when the noise state of the transmission line is good can be reduced, the power consumption during reception can be reduced, and stable reception can be performed even when the noise state is poor. Has an effect. In addition, it is not necessary to prepare multiple patterns of filter coefficients, and the storage capacity can be reduced.An advantageous effect is obtained.
[0148]
  Claim9According to the power line carrier communication device described inA transmission unit, a reception unit, a power line coupling circuit that superimposes a signal from the transmission unit on a power line as a power line communication signal and extracts only the power line communication signal from the power line, and the transmission unit and the reception unit A power line carrier communication device that performs communication using a plurality of subcarriers, wherein the transmission unit generates a plurality of bit strings from input transmission data, and A signal point mapper that maps a bit string to a complex signal point of each subcarrier, and each subcarrier is modulated with wavelet waveforms orthogonal to each other based on the complex signal point data of each subcarrier mapped by the signal point mapper. Wavelet inverse transformer for generating complex time waveform series data, and complex time waveform series output from the wavelet inverse transformer A quadrature modulator that shifts the frequency to an arbitrary carrier frequency band by performing quadrature modulation of the data, and a D / A converter that analog-converts complex time waveform series data output from the quadrature modulator, The receiving unit digitally converts the power line communication signal extracted from the power line by the power line coupling circuit to obtain sampling series waveform data, and baseband the sampling series waveform data by the A / D converter. From a quadrature demodulator that obtains a baseband signal sequence by frequency shifting to a band, a wavelet transformer that converts the baseband signal sequence output from the quadrature demodulator into signal point data of each subcarrier, and the wavelet transformer A plurality of signal point data to be output are inversely mapped, and the bit string mapped by the signal point mapper is discriminated and received. A symbol determiner that synthesizes as a data series, wherein the wavelet inverse transformer and the wavelet transformer are configured by a lattice-structure filter bank circuit, and the wavelet inverse transformer and the wavelet transformer further overlap each other. It has a plurality of plane rotation angle patterns according to the coefficients, and from among the plurality of plane rotation angle parameters according to the reception conditions such as the power line communication signal transmitted from the transmission unit, transmission path fluctuation, reception level, etc. A power line carrier communication device characterized by selecting an appropriate plane rotation angle parameterByA wavelet transform that eliminates the need for redundant signal parts called guard intervals, which was necessary in the OFDM transmission system, improves frequency utilization efficiency, and performs Fourier transform that requires complex operations only with real part operations. Therefore, the amount of calculation can be reduced and the circuit scale can be reduced. In addition, communication is possible even if the guard interval that causes transmission speed degradation is eliminated, and the band rejection filter that limits the frequency band used for communication according to the radio wave regulations of each country and causes an increase in circuit scale It is possible to obtain a sufficient amount of attenuation in the use band of the existing system without installing the. Furthermore, since signal point data in the complex region can be used by orthogonal modulation / demodulation, an advantageous effect that the frequency utilization efficiency can be further improved is obtained.
  In addition, the operation at the time of modulation and demodulation can be performed at a low rate and the operation clock frequency can be lowered, so that the power consumption of the circuit can be reduced. . In addition, since the amount of calculation can be reduced by using a high-speed DCT together, an advantageous effect that the power consumption and circuit scale of the circuit can be reduced can be obtained.
  Furthermore, the amount of calculation when the noise state of the transmission path is good can be reduced, power consumption at the time of reception can be reduced, and stable reception can be performed even when the noise state is poor. Has the effect of being able to. Further, there is no need to prepare a plurality of filter coefficient patterns, and an advantageous effect that the storage capacity can be reduced is obtained.
[0149]
  Claim10According to the power line carrier communication device described inThe said wavelet inverse transformer and the said wavelet transformer have a duplication orthogonal transformation function or generalized duplication orthogonal transformation function of perfect reconstruction or pseudo perfect reconstruction, The any one of Claim 7 thru | or 9 characterized by the above-mentioned. Power line communication equipmentBySince all the filters of the filter bank circuit that implements the wavelet transform can have linear phase characteristics, the number of multipliers required for the filter bank can be halved, and the circuit scale can be reduced. Has an effect. In addition, since the frequency characteristics of each subcarrier can be designed steeply around the main lobe, an advantageous effect is obtained in that the influence of interference from other subcarriers and noise outside the band can be reduced during reception. .
  In addition, the operation at the time of modulation and demodulation can be performed at a low rate and the operation clock frequency can be lowered, so that the power consumption of the circuit can be reduced. . In addition, since the amount of calculation can be reduced by using a high-speed DCT together, an advantageous effect that the power consumption and circuit scale of the circuit can be reduced can be obtained.
  Furthermore, the amount of calculation when the noise state of the transmission path is good can be reduced, power consumption at the time of reception can be reduced, and stable reception can be performed even when the noise state is poor. Has the effect of being able to. Further, there is no need to prepare a plurality of filter coefficient patterns, and an advantageous effect that the storage capacity can be reduced is obtained.
[0150]
  Claim11According to the power line carrier communication device described in claim11The power line carrier communication device described in10. The power line carrier communication apparatus according to claim 7, wherein the wavelet inverse transformer and the wavelet transformer have a modulation overlap conversion function or an extended modulation overlap conversion function.BySince the side lobe frequency characteristics of each subcarrier can be designed more steeply with the main lobe as the center, it is necessary to use a band-rejection filter that was necessary in the past for the purpose of not affecting the existing system in the power line carrier communication device. In addition, it is possible to obtain an advantageous effect that the influence of interference from other subcarriers and noise outside the band can be reduced during reception.
  In addition, the operation at the time of modulation and demodulation can be performed at a low rate and the operation clock frequency can be lowered, so that the power consumption of the circuit can be reduced. . In addition, since the amount of calculation can be reduced by using a high-speed DCT together, an advantageous effect that the power consumption and circuit scale of the circuit can be reduced can be obtained.
  Furthermore, the amount of calculation when the noise state of the transmission path is good can be reduced, power consumption at the time of reception can be reduced, and stable reception can be performed even when the noise state is poor. Has the effect of being able to. Further, there is no need to prepare a plurality of filter coefficient patterns, and an advantageous effect that the storage capacity can be reduced is obtained.
[0151]
  Claim12According to the power line carrier communication device described inThe control unit outputs a selection signal for selecting a subcarrier for mapping and modulating data to the signal point mapper, and the signal point mapper selects a selected subcarrier based on the selection signal. 12. The power line carrier communication apparatus according to claim 1, wherein data is mapped, and data for subcarriers not selected is mapped to zero.BySubcarriers to be output can be easily selected, signals can be output only at specific frequencies, and even if the frequency that can be used varies from country to country due to country-specific regulations The advantageous effect that it can respond to is obtained.
According to the power line carrier communication apparatus of claim 13, the signal from the transmission unit, the reception unit, and the transmission unit is superimposed on the power line as a power line communication signal, and only the power line communication signal is extracted from the power line. Power line coupling circuit, a control unit that controls each component of the transmission unit and the reception unit, and a power line carrier communication device that performs communication using a plurality of subcarriers, the transmission unit, A signal point mapr that generates a plurality of bit sequences from input transmission data and maps the bit sequences to signal points of each subcarrier, and a signal point map of each subcarrier mapped by the signal point maper. A wavelet inverse transformer that generates time waveform series data by modulating each subcarrier with an orthogonal wavelet waveform, and the wavelet inverse transform And a D / A converter for analog-converting the time waveform series data by the detector, and the receiving unit digitally converts the power line communication signal extracted from the power line by the power line coupling circuit to obtain sampling series waveform data An A / D converter, a wavelet converter that converts sampling series waveform data by the A / D converter into signal point data of each subcarrier, and a plurality of signal point data output from the wavelet converter are inversely mapped A symbol determination unit that determines a bit string mapped by the signal point mapper and combines it as a received data sequence, and the control unit maps and modulates data to the signal point mapper. The signal point mapper outputs a selection signal for selecting a subcarrier based on the selection signal. The power line carrier communication device is characterized in that the data for the subcarriers that are not selected is mapped to zero for the subcarriers that have not been selected, so that the output subcarriers can be easily selected, and It is possible to output only a signal, and it is possible to obtain an advantageous effect that even if the frequency that can be used differs from country to country due to country-specific regulations, it can be easily handled.
According to the power line carrier communication apparatus of claim 14, the signal from the transmission unit, the reception unit, and the transmission unit is superimposed on the power line as a power line communication signal, and only the power line communication signal is extracted from the power line. Power line coupling circuit, a control unit that controls each component of the transmission unit and the reception unit, and a power line carrier communication device that performs communication using a plurality of subcarriers, the transmission unit, A signal point mapr that generates a plurality of bit sequences from input transmission data and maps the bit sequences to signal points of each subcarrier, and a signal point map of each subcarrier mapped by the signal point maper. A wavelet inverse transformer that generates time waveform series data by modulating each subcarrier with an orthogonal wavelet waveform, and the wavelet inverse transform A frequency converter for transmission that shifts the time waveform series data output from the transmitter to an arbitrary carrier frequency band, and a D / A converter for analog conversion of the time waveform series data output from the transmission frequency converter; The A / D converter that digitally converts a power line communication signal extracted from a power line by the power line coupling circuit to obtain sampling series waveform data; and a sampling series by the A / D converter A receiving frequency converter that obtains a baseband signal sequence by frequency shifting waveform data to a baseband band, and a wavelet that converts the baseband signal sequence output from the receiving frequency converter into signal point data of each subcarrier. A plurality of signal point data output from the converter and the wavelet transformer, A symbol determination unit that discriminates a bit string mapped by an imager and synthesizes it as a received data sequence, and the control unit selects a subcarrier for mapping and modulating data to the signal point mapper Out The signal point mapper maps data for selected subcarriers based on the selection signal, and maps data for unselected subcarriers to zero. By using a communication device, it is possible to easily select a subcarrier to be output, and it is possible to output a signal only at a specific frequency, and the frequency that can be used varies from country to country according to country-specific regulations. Even if it is a case, the advantageous effect that it can respond easily is acquired.
According to the power line carrier communication device according to claim 15, the signal from the transmission unit, the reception unit, and the transmission unit is superimposed on the power line as a power line communication signal, and only the power line communication signal is extracted from the power line. Power line coupling circuit, a control unit that controls each component of the transmission unit and the reception unit, and a power line carrier communication device that performs communication using a plurality of subcarriers, the transmission unit, A signal point mapper that generates a plurality of bitstreams from input transmission data and maps the bitstreams to complex signal points of each subcarrier; and complex signal point data of each subcarrier mapped by the signal point mapper. And a wavelet inverse transformer for generating complex time waveform series data by modulating each subcarrier with wavelet waveforms orthogonal to each other, An orthogonal modulator that shifts the complex time waveform sequence data output from the let inverse converter to an arbitrary carrier frequency band by orthogonally modulating the complex time waveform sequence data, and analog conversion of the complex time waveform sequence data output from the orthogonal modulator A D / A converter, and the receiving unit digitally converts a power line communication signal extracted from the power line by the power line coupling circuit to obtain sampling series waveform data, and the A / D converter. A quadrature demodulator that obtains a baseband signal sequence by shifting the sampling sequence waveform data from the D converter to the baseband band, and converts the baseband signal sequence output from the quadrature demodulator into signal point data of each subcarrier. Wavelet transformer, and a plurality of signal point data output from the wavelet transformer A symbol determiner that discriminates a bit string mapped by the signal point mapper and synthesizes it as a received data sequence, and the control unit selects a subcarrier for mapping and modulating data to the signal point mapper. The signal point mapper maps data for selected subcarriers based on the selection signal, and maps data for unselected subcarriers to zero based on the selection signals. By selecting the power line carrier communication device, it is possible to easily select the subcarrier to be output, and it is possible to output a signal only at a specific frequency, and it can be used for each country according to country-specific laws and regulations. Even if the frequency is different, an advantageous effect that it can be easily handled is obtained.
According to the power line carrier communication apparatus of claim 16, the wavelet inverse transformer and the wavelet transformer have a complete orthogonal reconstruction function or a generalized overlap orthogonal transform function of a complete reconstruction or a pseudo complete reconstruction. The power line carrier communication device according to any one of claims 13 to 15, wherein all the filters of the filter bank circuit that realizes the wavelet transform can have a linear phase characteristic. The number of multipliers required for the circuit can be halved, and the circuit scale can be reduced. In addition, since the frequency characteristics of each subcarrier can be designed steeply around the main lobe, an advantageous effect is obtained in that the influence of interference from other subcarriers and noise outside the band can be reduced during reception. .
The power line carrier communication apparatus according to claim 17, wherein the wavelet inverse transformer and the wavelet transformer have a modulation duplication conversion function or an extended modulation duplication conversion function. By using the power line carrier communication device described in the above, the side lobe frequency characteristics of each subcarrier can be designed more steeply around the main lobe, so that the existing system is not affected in the power line carrier communication device. For this purpose, there is no need for a band rejection filter that has been necessary in the past, and an advantageous effect is obtained in that the influence of interference from other subcarriers or noise outside the band can be reduced during reception.
According to the power line carrier communication apparatus of claim 18, the wavelet inverse transformer and the wavelet transformer are configured by a polyphase filter bank circuit. The power line carrier communication device according to any one of claims 13 to 17, wherein the operation at the time of modulation and demodulation at the time of the orthogonal orthogonal transformation can be executed at a low rate, and the operating clock frequency is Since the power consumption can be lowered, the power consumption of the circuit can be reduced. Further, since the operation clock frequency can be lowered, it is possible to divert the arithmetic unit and to obtain an advantageous effect that the circuit scale can be reduced.
The power line carrier communication apparatus according to claim 19, wherein the wavelet inverse transformer and the wavelet transformer are configured by a lattice bank filter bank circuit. By using the power line carrier communication device described in the above, it is possible to execute the calculation at the time of the overlapping orthogonal transformation at the time of modulation and demodulation at a low rate, and the operation clock frequency can be lowered. It has the effect | action that can be reduced. In addition, since the amount of calculation can be reduced by using a high-speed DCT together, an advantageous effect that the power consumption and circuit scale of the circuit can be reduced can be obtained.
[0152]
  Claim20According to the power line carrier communication device described inThe control unit detects a frequency band in which relatively large noise is constantly present by estimating a noise state on the power line by a signal power to noise power ratio using a determination result by the symbol determiner. 21. The transmission unit according to claim 12, wherein the transmission unit performs control so that the selection signal is not output to the signal point mapper for a subcarrier on a frequency band where a large amount of noise constantly exists. The power line carrier communication apparatus according to any one ofByNoise state on the power line can be grasped, usable subcarriers can be selected, and more reliable communication can be performed by selecting subcarriers so as to avoid frequency positions where large noise components exist in advance. The advantageous effect that it can be performed is obtained.
According to the power line carrier communication apparatus of claim 21, the control unit is configured to provide a signal when priority is given to a communication speed for signal point mapping by the signal point mapper and control of the selection signal to the subcarrier. Multi-value by increasing the number of signal points mapped by the point mapper, and when priority is given to the reliability of data transmission, the number of signal points mapped by the signal point mapper is reduced and binarized. 21. The power line carrier communication device according to claim 12, wherein the transmission rate can be easily changed to a designated speed, and a subcarrier other than the designated transmission speed is realized. Can be used for another communication, so that an advantageous effect of improving the band utilization efficiency can be obtained.
According to the power line carrier communication apparatus of claim 22, the control unit investigates an error rate of each subcarrier with respect to signal point mapping by the signal point mapper and control of the selection signal to each subcarrier. The power line carrier communication apparatus according to any one of claims 12 to 21, wherein control is performed so that subcarriers having a low error rate are used preferentially for communication among the subcarriers. As a result, the subcarriers with a low error rate are preferentially used for communication, so that an advantageous effect that the number of reception errors can be reduced is obtained.
The power line carrier communication apparatus according to claim 23, wherein the control unit sets the gain of the transmission amplifier based on a signal power to noise power ratio of a reception signal received by the reception unit. The power line carrier communication apparatus according to any one of claims 1 to 22, wherein when the noise level on the power line is low and a communication error does not occur, the output level can be reduced, so that transmission is necessary. An advantageous effect that it is possible to reduce the amount of electric power is obtained.
According to the power line carrier communication device of claim 24, the signal from the transmission unit, the reception unit, and the transmission unit is superimposed on the power line as a power line communication signal, and only the power line communication signal is extracted from the power line. Power line coupling circuit, a control unit that controls each component of the transmission unit and the reception unit, and a power line carrier communication device that performs communication using a plurality of subcarriers, the transmission unit, A signal point mapper that generates a plurality of bitstreams from input transmission data and maps the bitstreams to signal points of each subcarrier, and a signal point map of each subcarrier mapped by the signal point mapper. A wavelet inverse transformer that generates time waveform series data by modulating each subcarrier with an orthogonal wavelet waveform; and the wavelet inverse transform And a D / A converter for analog-converting the time waveform series data from the detector, and the receiving unit digitally converts the power line communication signal extracted from the power line by the power line coupling circuit to obtain sampling series waveform data An A / D converter, a wavelet converter that converts sampling series waveform data by the A / D converter into signal point data of each subcarrier, and a plurality of signal point data output from the wavelet converter are inversely mapped And a symbol determination unit that determines a bit string mapped by the signal point mapper and combines it as a reception data sequence, and the control unit is configured to obtain the gain of the transmission amplifier of the received signal received by the reception unit. By setting the power line carrier communication device to be set based on the signal power to noise power ratio, the noise level on the power line Since in the case of low communication error does not occur can be lowered output levels, beneficial effects are obtained that it is possible to reduce power required for transmission.
According to the power line carrier communication apparatus of claim 25, the signal from the transmission unit, the reception unit, and the transmission unit is superimposed on the power line as a power line communication signal, and only the power line communication signal is extracted from the power line. Power line coupling circuit, a control unit that controls each component of the transmission unit and the reception unit, and a power line carrier communication device that performs communication using a plurality of subcarriers, the transmission unit, A signal point mapr that generates a plurality of bit sequences from input transmission data and maps the bit sequences to signal points of each subcarrier, and a signal point map of each subcarrier mapped by the signal point maper. A wavelet inverse transformer that generates time waveform series data by modulating each subcarrier with an orthogonal wavelet waveform; and the wavelet inverse transform A frequency converter for transmission that shifts the time waveform series data output from the transmitter to an arbitrary carrier frequency band, and a D / A converter for analog conversion of the time waveform series data output from the transmission frequency converter; The A / D converter that digitally converts a power line communication signal extracted from a power line by the power line coupling circuit to obtain sampling series waveform data; and a sampling series by the A / D converter A receiving frequency converter that obtains a baseband signal sequence by frequency shifting waveform data to a baseband band, and a wavelet that converts the baseband signal sequence output from the receiving frequency converter into signal point data of each subcarrier. A plurality of signal point data output from the converter and the wavelet transformer, A symbol decision unit that discriminates a bit string mapped by an imager and synthesizes it as a reception data sequence, wherein the control unit obtains the gain of the transmission amplifier from the signal power of the reception signal received by the reception unit versus the noise power By setting the power line carrier communication device to be set based on the ratio, the output level can be reduced when the noise level on the power line is low and no communication error occurs. The advantageous effect that it can be reduced is obtained.
According to the power line carrier communication device of claim 26, the signal from the transmission unit, the reception unit, and the transmission unit is superimposed on the power line as a power line communication signal, and only the power line communication signal is extracted from the power line. Power line coupling circuit, a control unit that controls each component of the transmission unit and the reception unit, and a power line carrier communication device that performs communication using a plurality of subcarriers, the transmission unit, A signal point mapper that generates a plurality of bitstreams from input transmission data and maps the bitstreams to complex signal points of each subcarrier; and complex signal point data of each subcarrier mapped by the signal point mapper. A wavelet inverse transformer that generates complex time waveform series data by modulating each subcarrier with wavelet waveforms orthogonal to each other, An orthogonal modulator that shifts the complex time waveform sequence data output from the let inverse converter to an arbitrary carrier frequency band by orthogonally modulating the complex time waveform sequence data, and analog conversion of the complex time waveform sequence data output from the orthogonal modulator A D / A converter, and the receiving unit digitally converts a power line communication signal extracted from the power line by the power line coupling circuit to obtain sampling series waveform data, and the A / D converter. A quadrature demodulator that obtains a baseband signal sequence by shifting the sampling sequence waveform data from the D converter to the baseband band, and converts the baseband signal sequence output from the quadrature demodulator into signal point data of each subcarrier. Wavelet transformer, and a plurality of signal point data output from the wavelet transformer A symbol decision unit for discriminating a bit string mapped by the signal point mapper and synthesizing it as a received data sequence, wherein the control unit is configured to obtain a signal power of a reception signal received by the reception unit by a gain of the transmission amplifier. By setting the power line carrier communication device to be set based on the noise-to-noise ratio, the output level can be reduced when the noise level on the power line is low and no communication error occurs. The advantageous effect that the required power can be reduced is obtained.
According to the power line carrier communication apparatus of claim 27, the wavelet inverse transformer and the wavelet transformer have a complete orthogonal reconstruction function or a pseudo-complete reconstruction overlapping orthogonal transformation function or a generalized overlapping orthogonal transformation function. The power line carrier communication device according to any one of claims 24 to 26, wherein all the filters of the filter bank circuit that realizes the wavelet transform can have a linear phase characteristic. The number of multipliers required for the system can be halved and the circuit scale can be reduced. Has an effect. In addition, since the frequency characteristics of each subcarrier can be designed steeply around the main lobe, an advantageous effect is obtained in that the influence of interference from other subcarriers and noise outside the band can be reduced during reception. .
28. The power line carrier communication apparatus according to claim 28, wherein the wavelet inverse transformer and the wavelet transformer have a modulation duplication conversion function or an extended modulation duplication transformation function. By using the power line carrier communication device described in the above, the side lobe frequency characteristics of each subcarrier can be designed more steeply around the main lobe, so that the existing system is not affected in the power line carrier communication device. For this purpose, there is no need for a band rejection filter that has been necessary in the past, and an advantageous effect is obtained in that the influence of interference from other subcarriers or noise outside the band can be reduced during reception.
29. The power line carrier communication apparatus according to claim 29, wherein the wavelet inverse transformer and the wavelet transformer are configured by a polyphase filter bank circuit. By using this power line carrier communication device, it is possible to perform operations at the time of modulation and demodulation at the time of overlapping orthogonal transformation at a low rate, and the operation clock frequency can be lowered, thereby reducing the power consumption of the circuit. It has the effect of being able to. Further, since the operation clock frequency can be lowered, it is possible to divert the arithmetic unit and to obtain an advantageous effect that the circuit scale can be reduced.
30. The power line carrier communication apparatus according to claim 30, wherein the wavelet inverse transformer and the wavelet transformer are configured by a lattice bank filter bank circuit. By using the power line communication carrier device described in 1), it is possible to perform computations at the time of overlapping orthogonal transformation at the time of modulation and demodulation at a low rate, and to reduce the operation clock frequency. It has the effect | action that can be reduced. In addition, since the amount of calculation can be reduced by using a high-speed DCT together, an advantageous effect that the power consumption and circuit scale of the circuit can be reduced can be obtained.
[Brief description of the drawings]
FIG. 1A is a graph for explaining the concept of a time waveform of a wavelet.
(B) Graph for conceptual explanation of frequency spectrum of wavelet
FIG. 2A is an explanatory diagram showing a data flow in orthogonal transform.
(B) Explanatory drawing which shows the data flow in overlap orthogonal transformation
FIG. 3 is a block diagram showing a power line carrier communication apparatus according to Embodiment 1 of the present invention.
FIG. 4 is an explanatory diagram for explaining the operation of the transmission unit of the power line carrier communication apparatus.
FIG. 5 is an explanatory diagram for explaining the operation of the receiving unit of the power line carrier communication apparatus.
FIG. 6 is a block diagram showing a power line carrier communication apparatus according to Embodiment 2 of the present invention.
FIG. 7 is a block diagram showing a power line carrier communication apparatus according to Embodiment 3 of the present invention.
FIG. 8 is an explanatory diagram for explaining the operation of the transmission unit of the power line carrier communication apparatus.
FIG. 9 is an explanatory diagram for explaining the operation of the receiving unit of the power line carrier communication apparatus.
FIG. 10A is a graph showing an example of an impulse response of each filter of a filter bank circuit realizing a GLT with four-part perfect reconstruction.
(B) A graph showing an example of the frequency response of each filter of the filter bank circuit realizing the GLT with four-part complete reconstruction
FIG. 11A is a graph showing an example of an impulse response of each filter of a filter bank circuit realizing an ELT of four divisions.
(B) A graph showing an example of the frequency response of each filter of the filter bank circuit realizing the 4-division ELT
FIG. 12A is a block diagram showing a band synthesis filter bank circuit configured with a general FIR filter;
(B) Block diagram showing a band division filter bank circuit configured with a general FIR filter
FIG. 13A is a block diagram showing a band synthesis filter bank circuit configured with a polyphase filter;
(B) Block diagram showing a band-division filter bank circuit composed of polyphase filters
14 is a block diagram showing the polyphase filter of FIG.
15A is a block diagram showing a band synthesis filter bank circuit as wavelet inverse transform of the power line carrier communication device of FIGS. 3, 6, and 7. FIG.
(B) Block diagram showing a band division filter bank circuit as a wavelet transform of the power line carrier communication device of FIG. 3, FIG. 6, and FIG.
FIG. 16 is a functional block diagram showing a plane rotation arithmetic circuit.
FIG. 17 is an explanatory diagram for explaining a control method for a power line carrier communication apparatus according to a tenth embodiment of the present invention;
FIG. 18 is a graph showing an example of a frequency spectrum approved for power line carrier communication;
FIG. 19 is a graph showing a transmission frequency spectrum when OFDM transmission is used.
FIG. 20 is a graph showing a transmission frequency spectrum of the power line carrier communication device.
FIG. 21 is an explanatory diagram for explaining a control method of the power line carrier communication apparatus of FIGS. 3, 6, and 7;
FIG. 22 is a flowchart showing the operation of the control unit of the power line carrier communication apparatus according to Embodiment 13 of the present invention;
FIG. 23A is an explanatory diagram showing changes in the number of signal points of the signal point mapper of the power line carrier communication device.
(B) Explanatory drawing which shows the change of the signal point number of the signal point mapper of a power line carrier communication apparatus.
FIG. 24 is a flowchart showing the operation of the power line carrier communication apparatus according to the fourteenth embodiment of the present invention.
FIG. 25 is a block diagram showing a power line carrier communication device described in Japanese Patent Application Laid-Open No. 2000-165304.
FIG. 26 is a graph showing the guard interval mechanism.
FIG. 27 is a graph showing OFDM filter bank characteristics;
[Explanation of symbols]
100 Power line carrier communication device
101 Transmitter
102 Signal point mapper
103 Inverse wavelet transform
104 D / A converter
105 Transmitting amplifier
106, 112 Band pass filter
107 SSB modulator
108 Quadrature modulator
110 Power line
111 Receiver
113 Amplitude controller
114 A / D converter
115 Wavelet transform
116 Symbol determiner
117 SSB demodulator
118 Quadrature demodulator
121 Power line coupling circuit
122 Control unit
200, 300, 400 Band synthesis filter bank circuit
201, 302, 405 Upsampler
202 FIR filter
203 FIR filter group
204, 303, 322, 406 2-input adder
210, 310, 410 Band-division filter bank circuit
211 FIR filter
212 FIR filters
213, 312, 412 Downsampler
301,313 Polyphase filter
304, 311, 402, 407, 411, 415 Delay element (1 sampling time)
321 filter
401, 416 discrete cosine transformer
403, 414 plane rotation calculator
404, 413 Delay element (2 sampling times)

Claims (30)

  1. A transmission unit, a reception unit, a power line coupling circuit that superimposes a signal from the transmission unit on a power line as a power line communication signal and extracts only the power line communication signal from the power line, and the transmission unit and the reception unit A power line carrier communication device having a control unit for controlling each component and performing communication using a plurality of subcarriers,
    The transmission unit generates a plurality of bit sequences from input transmission data and maps the bit sequences to signal points of each subcarrier, and signals of each subcarrier mapped by the signal point mapper Wavelet inverse transformer for generating time waveform series data by modulating each subcarrier with wavelet waveforms orthogonal to each other based on point data, and D / A for analog conversion of time waveform series data by the wavelet inverse transformer A converter,
    The receiving unit digitally converts a power line communication signal extracted from a power line by the power line coupling circuit to obtain sampling series waveform data, and each sampling series waveform data by the A / D converter A wavelet transformer for converting to subcarrier signal point data, and a plurality of signal point data output from the wavelet transformer are inversely mapped to discriminate a bit string mapped by the signal point mapper and synthesize it as a received data sequence possess a symbol decision unit for,
    The wavelet inverse transformer and the wavelet transformer have a plurality of filter coefficient patterns having different filter lengths according to overlap coefficients, such as a power line communication signal transmitted from the transmission unit, a transmission path variation, a reception level, etc. A power line carrier communication apparatus, wherein an appropriate filter coefficient pattern is selected from the plurality of filter coefficient patterns according to reception conditions.
  2. A transmission unit, a reception unit, a power line coupling circuit that superimposes a signal from the transmission unit on a power line as a power line communication signal and extracts only the power line communication signal from the power line, and the transmission unit and the reception unit A power line carrier communication device having a control unit for controlling each component and performing communication using a plurality of subcarriers,
    The transmission unit generates a plurality of bit sequences from input transmission data and maps the bit sequences to signal points of each subcarrier, and signals of each subcarrier mapped by the signal point mapper Wavelet inverse transformer for generating time waveform series data by modulating each subcarrier with wavelet waveforms orthogonal to each other based on point data, and time waveform series data output from the wavelet inverse transformer for any carrier wave A transmission frequency converter that shifts the frequency to a frequency band; and a D / A converter that analog-converts time waveform series data output from the transmission frequency converter;
    The receiver includes an A / D converter that digitally converts a power line communication signal extracted from a power line by the power line coupling circuit to obtain sampling series waveform data, and a sampling series waveform data obtained by the A / D converter. A frequency converter for reception to obtain a baseband signal sequence by frequency shifting to a band band, a wavelet converter for converting the baseband signal sequence output from the frequency converter for reception into signal point data of each subcarrier, and have a symbol determiner synthesized as received data series to determine the bit sequence mapped in the signal point mapper to inverse mapping a plurality of signal point data output from the wavelet transformer,
    The wavelet inverse transformer and the wavelet transformer have a plurality of filter coefficient patterns having different filter lengths according to overlap coefficients, such as a power line communication signal transmitted from the transmission unit, a transmission path variation, a reception level, etc. A power line carrier communication apparatus, wherein an appropriate filter coefficient pattern is selected from the plurality of filter coefficient patterns according to reception conditions.
  3. A transmission unit, a reception unit, a power line coupling circuit that superimposes a signal from the transmission unit on a power line as a power line communication signal and extracts only the power line communication signal from the power line, and the transmission unit and the reception unit A power line carrier communication device having a control unit for controlling each component and performing communication using a plurality of subcarriers,
    The transmission unit generates a plurality of bit sequences from input transmission data, maps the bit sequences to complex signal points of each subcarrier, and each subcarrier mapped by the signal point mapper. Wavelet inverse transformer for generating complex time waveform series data by modulating each subcarrier with wavelet waveforms orthogonal to each other based on complex signal point data, and complex time waveform series data output from the wavelet inverse transformer A quadrature modulator that shifts the frequency to an arbitrary carrier frequency band by performing quadrature modulation, and a D / A converter that analog-converts complex time waveform series data output from the quadrature modulator,
    The receiver includes an A / D converter that digitally converts a power line communication signal extracted from a power line by the power line coupling circuit to obtain sampling series waveform data, and a sampling series waveform data obtained by the A / D converter. A quadrature demodulator that obtains a baseband signal sequence by frequency shifting to a band band, a wavelet transformer that converts the baseband signal sequence output from the quadrature demodulator into signal point data of each subcarrier, and the wavelet transformer and inverse mapping the plurality of signal points data output have a symbol determiner synthesized as received data series to determine the bit sequence mapped in the signal point mapper from
    The wavelet inverse transformer and the wavelet transformer have a plurality of filter coefficient patterns having different filter lengths according to overlap coefficients, such as a power line communication signal transmitted from the transmission unit, a transmission path variation, a reception level, etc. A power line carrier communication apparatus, wherein an appropriate filter coefficient pattern is selected from the plurality of filter coefficient patterns according to reception conditions.
  4. 4. The wavelet inverse transformer and the wavelet transformer each have a complete orthogonal reconstruction function or a pseudo complete reconstruction overlap orthogonal transform function or a generalized overlap orthogonal transform function. Power line carrier communication device.
  5. 4. The power line carrier communication apparatus according to claim 1, wherein the wavelet inverse transformer and the wavelet transformer have a modulation overlap conversion function or an extended modulation overlap conversion function. 5.
  6. The power line carrier communication device according to any one of claims 1 to 5, wherein the wavelet inverse transformer and the wavelet transformer are configured by a polyphase filter bank circuit.
  7. A transmission unit, a reception unit, a power line coupling circuit that superimposes a signal from the transmission unit on a power line as a power line communication signal and extracts only the power line communication signal from the power line, and the transmission unit and the reception unit A power line carrier communication device having a control unit for controlling each component and performing communication using a plurality of subcarriers,
    The transmission unit generates a plurality of bit sequences from input transmission data and maps the bit sequences to signal points of each subcarrier, and signals of each subcarrier mapped by the signal point mapper Wavelet inverse transformer for generating time waveform series data by modulating each subcarrier with wavelet waveforms orthogonal to each other based on point data, and D / A for analog conversion of time waveform series data by the wavelet inverse transformer A converter,
    The receiving unit digitally converts a power line communication signal extracted from a power line by the power line coupling circuit to obtain sampling series waveform data, and each sampling series waveform data by the A / D converter A wavelet transformer for converting to subcarrier signal point data, and a plurality of signal point data output from the wavelet transformer are inversely mapped to discriminate a bit string mapped by the signal point mapper and synthesize it as a received data sequence With symbol determiner
    Have
    The wavelet inverse transformer and the wavelet transformer are configured by a lattice bank filter bank circuit ,
    The wavelet inverse transformer and the wavelet transformer further have a plurality of plane rotation angle patterns corresponding to overlap coefficients, and receive power line communication signals transmitted from a transmitter, transmission line fluctuations, reception levels, etc. A power line carrier communication apparatus , wherein an appropriate plane rotation angle parameter is selected from the plurality of plane rotation angle parameters according to conditions .
  8. A transmission unit, a reception unit, a power line coupling circuit that superimposes a signal from the transmission unit on a power line as a power line communication signal and extracts only the power line communication signal from the power line, and the transmission unit and the reception unit A power line carrier communication device having a control unit for controlling each component and performing communication using a plurality of subcarriers,
    The transmission unit generates a plurality of bit sequences from input transmission data, maps the bit sequences to signal points of each subcarrier, and signals of each subcarrier mapped by the signal point mapper Wavelet inverse transformer for generating time waveform series data by modulating each subcarrier with wavelet waveforms orthogonal to each other based on point data, and time waveform series data output from the wavelet inverse transformer for any carrier wave A transmission frequency converter that shifts the frequency to a frequency band, and a D / A converter that analog-converts time waveform series data output from the transmission frequency converter,
    The receiver includes an A / D converter that digitally converts a power line communication signal extracted from a power line by the power line coupling circuit to obtain sampling series waveform data, and a sampling series waveform data obtained by the A / D converter. A frequency converter for reception to obtain a baseband signal sequence by frequency shifting to a band band, a wavelet converter for converting the baseband signal sequence output from the frequency converter for reception into signal point data of each subcarrier, and A symbol determiner that reversely maps a plurality of signal point data output from the wavelet transformer, discriminates a bit string mapped by the signal point mapper, and synthesizes the received data sequence;
    The wavelet inverse transformer and the wavelet transformer are configured by a lattice bank filter bank circuit,
    The wavelet inverse transformer and the wavelet transformer further have a plurality of plane rotation angle patterns corresponding to overlap coefficients, and receive power line communication signals transmitted from a transmitter, transmission line fluctuations, reception levels, etc. A power line carrier communication apparatus , wherein an appropriate plane rotation angle parameter is selected from the plurality of plane rotation angle parameters according to conditions .
  9. A transmission unit, a reception unit, a power line coupling circuit that superimposes a signal from the transmission unit on a power line as a power line communication signal and extracts only the power line communication signal from the power line, and the transmission unit and the reception unit A power line carrier communication device having a control unit for controlling each component and performing communication using a plurality of subcarriers,
    The transmission unit generates a plurality of bit sequences from input transmission data, maps the bit sequences to complex signal points of each subcarrier, and each subcarrier mapped by the signal point mapper. Wavelet inverse transformer for generating complex time waveform series data by modulating each subcarrier with wavelet waveforms orthogonal to each other based on complex signal point data, and complex time waveform series data output from the wavelet inverse transformer A quadrature modulator that shifts the frequency to an arbitrary carrier frequency band by performing quadrature modulation, and a D / A converter that analog-converts complex time waveform series data output from the quadrature modulator,
    The receiver includes an A / D converter that digitally converts a power line communication signal extracted from a power line by the power line coupling circuit to obtain sampling series waveform data, and a sampling series waveform data obtained by the A / D converter. An orthogonal demodulator that obtains a baseband signal sequence by frequency shifting to a band band, a wavelet transformer that converts a baseband signal sequence output from the orthogonal demodulator into signal point data of each subcarrier, and the wavelet transformer A symbol determiner that inversely maps a plurality of signal point data output from the signal point map, discriminates a bit string mapped by the signal point mapper, and synthesizes it as a received data sequence;
    The wavelet inverse transformer and the wavelet transformer are configured by a lattice bank filter bank circuit,
    The wavelet inverse transformer and the wavelet transformer further have a plurality of plane rotation angle patterns corresponding to overlap coefficients, and receive power line communication signals transmitted from a transmitter, transmission line fluctuations, reception levels, etc. A power line carrier communication apparatus, wherein an appropriate plane rotation angle parameter is selected from the plurality of plane rotation angle parameters according to conditions.
  10. The wavelet inverse transformer and the wavelet transformer each have a complete orthogonal reconstruction function or a pseudo perfect reconstruction overlap orthogonal transformation function or a generalized overlap orthogonal transformation function. The power line carrier communication apparatus according to any one of claims 7 to 9.
  11. 10. The power line carrier communication apparatus according to claim 7, wherein the wavelet inverse transformer and the wavelet transformer have a modulation overlap conversion function or an extended modulation overlap conversion function.
  12. The control unit outputs a selection signal for selecting a subcarrier for mapping and modulating data to the signal point mapper, and the signal point mapper selects a selected subcarrier based on the selection signal. mapping the data Te, the power line communication apparatus according to any one of claims 1 to 11 data for subcarriers not selected and wherein the mapping the zero.
  13. A transmission unit, a reception unit, a power line coupling circuit that superimposes a signal from the transmission unit on a power line as a power line communication signal and extracts only the power line communication signal from the power line, and the transmission unit and the reception unit A power line carrier communication device having a control unit for controlling each component and performing communication using a plurality of subcarriers,
      The transmission unit generates a plurality of bit sequences from input transmission data and maps the bit sequences to signal points of each subcarrier, and signals of each subcarrier mapped by the signal point mapper Wavelet inverse transformer for generating time waveform series data by modulating each subcarrier with wavelet waveforms orthogonal to each other based on point data, and D / A for analog conversion of time waveform series data by the wavelet inverse transformer A converter,
      The receiving unit digitally converts a power line communication signal extracted from a power line by the power line coupling circuit to obtain sampling series waveform data, and each sampling series waveform data by the A / D converter A wavelet transformer for converting to subcarrier signal point data, and a plurality of signal point data output from the wavelet transformer are inversely mapped to discriminate a bit string mapped by the signal point mapper and synthesize it as a received data sequence With symbol determiner
    Have
      The control unit outputs a selection signal for selecting a subcarrier for mapping and modulating data to the signal point mapper, and the signal point mapper selects a selected subcarrier based on the selection signal. A power line carrier communication apparatus characterized in that data is mapped and data for subcarriers not selected is mapped to zero.
  14. A transmission unit, a reception unit, a power line coupling circuit that superimposes a signal from the transmission unit on a power line as a power line communication signal and extracts only the power line communication signal from the power line, and the transmission unit and the reception unit A power line carrier communication device having a control unit for controlling each component and performing communication using a plurality of subcarriers,
      The transmission unit generates a plurality of bit sequences from input transmission data and maps the bit sequences to signal points of each subcarrier, and signals of each subcarrier mapped by the signal point mapper Wavelet inverse transformer for generating time waveform series data by modulating each subcarrier with wavelet waveforms orthogonal to each other based on point data, and time waveform series data output from the wavelet inverse transformer for any carrier wave A transmission frequency converter that shifts the frequency to a frequency band; and a D / A converter that analog-converts time waveform series data output from the transmission frequency converter;
      The receiver includes an A / D converter that digitally converts a power line communication signal extracted from a power line by the power line coupling circuit to obtain sampling series waveform data, and a sampling series waveform data obtained by the A / D converter. A frequency converter for reception to obtain a baseband signal sequence by frequency shifting to a band band, a wavelet converter for converting the baseband signal sequence output from the frequency converter for reception into signal point data of each subcarrier, and A symbol determiner that reversely maps a plurality of signal point data output from the wavelet transformer, discriminates a bit string mapped by the signal point mapper, and synthesizes the received data sequence;
      The control unit outputs a selection signal for selecting a subcarrier for mapping and modulating data to the signal point mapper, and the signal point mapper is selected based on the selection signal A power line carrier communication apparatus, wherein data is mapped to subcarriers, and zero is mapped to data of unselected subcarriers.
  15. A transmission unit, a reception unit, a power line coupling circuit that superimposes a signal from the transmission unit on a power line as a power line communication signal and extracts only the power line communication signal from the power line, and the transmission unit and the reception unit A power line carrier communication device having a control unit for controlling each component and performing communication using a plurality of subcarriers,
    The transmission unit generates a plurality of bit sequences from input transmission data, maps the bit sequences to complex signal points of each subcarrier, and each subcarrier mapped by the signal point mapper. Wavelet inverse transformer for generating complex time waveform series data by modulating each subcarrier with wavelet waveforms orthogonal to each other based on complex signal point data, and complex time waveform series data output from the wavelet inverse transformer A quadrature modulator that shifts the frequency to an arbitrary carrier frequency band by performing quadrature modulation, and a D / A converter that analog-converts complex time waveform series data output from the quadrature modulator,
    The receiver includes an A / D converter that digitally converts a power line communication signal extracted from a power line by the power line coupling circuit to obtain sampling series waveform data, and a sampling series waveform data obtained by the A / D converter. A quadrature demodulator that obtains a baseband signal sequence by frequency shifting to a band band, a wavelet transformer that converts the baseband signal sequence output from the quadrature demodulator into signal point data of each subcarrier, and the wavelet transformer and inverse mapping the plurality of signal points data output have a symbol determiner synthesized as received data series to determine the bit sequence mapped in the signal point mapper from
    The control unit outputs a selection signal for selecting a subcarrier for mapping and modulating data to the signal point mapper, and the signal point mapper selects a selected subcarrier based on the selection signal. A power line carrier communication apparatus characterized in that data is mapped and data for subcarriers not selected is mapped to zero.
  16. 16. The wavelet inverse transformer and the wavelet transformer each have a complete orthogonal reconstruction function or a pseudo complete reconstruction overlap orthogonal transform function or a generalized overlap orthogonal transform function. Power line carrier communication device.
  17. 16. The power line carrier communication apparatus according to claim 13, wherein the wavelet inverse transformer and the wavelet transformer have a modulation overlap conversion function or an extended modulation overlap conversion function.
  18. 18. The power line carrier communication device according to claim 13, wherein the wavelet inverse transformer and the wavelet transformer are configured by a polyphase filter bank circuit.
  19. 18. The power line carrier communication device according to claim 13, wherein the wavelet inverse transformer and the wavelet transformer are configured by a lattice bank filter bank circuit. 18.
  20. The control unit detects a frequency band in which relatively large noise is constantly present by estimating a noise state on the power line by a signal power to noise power ratio using a determination result by the symbol determiner. 20. The transmission unit according to claim 12 , wherein the transmission unit performs control so that the selection signal is not output to the signal point mapper for a subcarrier on a frequency band in which a large amount of noise constantly exists . The power line carrier communication apparatus according to any one of the above.
  21. In the control of the signal point mapping by the signal point mapper and the selection signal to the subcarrier, the control unit increases the number of signal points mapped by the signal point mapper when priority is given to the communication speed. The power line according to any one of claims 12 to 20, wherein, in the case of valuation and giving priority to reliability of data transmission, the number of signal points mapped by the signal point mapper is reduced and binarized. Carrier communication device.
  22. The control unit investigates the error rate of each subcarrier with respect to the signal point mapping by the signal point mapper and the control of the selection signal to each subcarrier, and among the subcarriers, the subcarrier having a small error rate The power line carrier communication apparatus according to any one of claims 12 to 21 , wherein control is performed so that communication is preferentially used for communication.
  23. The power line carrier according to any one of claims 1 to 22 , wherein the control unit sets a gain of a transmission amplifier based on a signal power-to-noise power ratio of a reception signal received by the reception unit. Communication device.
  24. A transmission unit, a reception unit, a power line coupling circuit that superimposes a signal from the transmission unit on a power line as a power line communication signal and extracts only the power line communication signal from the power line, and the transmission unit and the reception unit A power line carrier communication device having a control unit for controlling each component and performing communication using a plurality of subcarriers,
      The transmission unit generates a plurality of bit sequences from input transmission data and maps the bit sequences to signal points of each subcarrier, and signals of each subcarrier mapped by the signal point mapper Wavelet inverse transformer for generating time waveform series data by modulating each subcarrier with wavelet waveforms orthogonal to each other based on point data, and D / A for analog conversion of time waveform series data by the wavelet inverse transformer A converter,
      The receiving unit digitally converts a power line communication signal extracted from a power line by the power line coupling circuit to obtain sampling series waveform data, and each sampling series waveform data by the A / D converter A wavelet transformer for converting to subcarrier signal point data, and a plurality of signal point data output from the wavelet transformer are inversely mapped to discriminate a bit string mapped by the signal point mapper and synthesize it as a received data sequence With symbol determiner
    Have
      The control unit sets a gain of the transmission amplifier based on a signal power to noise power ratio of a reception signal received by the reception unit.
  25. A transmission unit, a reception unit, a power line coupling circuit that superimposes a signal from the transmission unit on a power line as a power line communication signal and extracts only the power line communication signal from the power line, and the transmission unit and the reception unit A power line carrier communication device having a control unit for controlling each component and performing communication using a plurality of subcarriers,
      The transmission unit generates a plurality of bit sequences from input transmission data and maps the bit sequences to signal points of each subcarrier, and signals of each subcarrier mapped by the signal point mapper Wavelet inverse transformer for generating time waveform series data by modulating each subcarrier with wavelet waveforms orthogonal to each other based on point data, and time waveform series data output from the wavelet inverse transformer for any carrier wave A transmission frequency converter that shifts the frequency to a frequency band; and a D / A converter that analog-converts time waveform series data output from the transmission frequency converter;
      The receiver includes an A / D converter that digitally converts a power line communication signal extracted from a power line by the power line coupling circuit to obtain sampling series waveform data, and a sampling series waveform data obtained by the A / D converter. A frequency converter for reception to obtain a baseband signal sequence by frequency shifting to a band band, a wavelet converter for converting the baseband signal sequence output from the frequency converter for reception into signal point data of each subcarrier, and A symbol determiner that reversely maps a plurality of signal point data output from the wavelet transformer, discriminates a bit string mapped by the signal point mapper, and synthesizes the received data sequence;
      The control unit sets a gain of the transmission amplifier based on a signal power to noise power ratio of a reception signal received by the reception unit.
  26. A transmission unit, a reception unit, a power line coupling circuit that superimposes a signal from the transmission unit on a power line as a power line communication signal and extracts only the power line communication signal from the power line, and the transmission unit and the reception unit A power line carrier communication device having a control unit for controlling each component and performing communication using a plurality of subcarriers,
      The transmission unit generates a plurality of bit sequences from input transmission data, maps the bit sequences to complex signal points of each subcarrier, and each subcarrier mapped by the signal point mapper. Based on complex signal point data, the wavelet waveforms are orthogonal to each other. A wavelet inverse transformer for generating complex time waveform series data by modulating each subcarrier, and an arbitrary carrier frequency band by orthogonally modulating the complex time waveform series data output from the wavelet inverse transformer A quadrature modulator that shifts the frequency to a D / A converter that analog-converts complex time waveform series data output from the quadrature modulator,
      The receiver includes an A / D converter that digitally converts a power line communication signal extracted from a power line by the power line coupling circuit to obtain sampling series waveform data, and a sampling series waveform data obtained by the A / D converter. A quadrature demodulator that obtains a baseband signal sequence by frequency shifting to a band band, a wavelet transformer that converts the baseband signal sequence output from the quadrature demodulator into signal point data of each subcarrier, and the wavelet transformer A symbol determiner that inversely maps a plurality of signal point data output from the signal point map, discriminates a bit string mapped by the signal point mapper, and synthesizes the received data sequence
      The control unit sets a gain of the transmission amplifier based on a signal power to noise power ratio of a reception signal received by the reception unit.
  27. 27. The wavelet inverse transformer and the wavelet transformer each have a complete orthogonal reconstruction function or a pseudo perfect reconstruction overlap orthogonal transform function or a generalized overlap orthogonal transform function. Power line carrier communication device.
  28. 27. The power line carrier communication apparatus according to claim 24, wherein the wavelet inverse transformer and the wavelet transformer have a modulation overlap conversion function or an extended modulation overlap conversion function.
  29. The power line carrier communication apparatus according to any one of claims 24 to 28, wherein the wavelet inverse transformer and the wavelet transformer are configured by a polyphase filter bank circuit.
  30. 29. The power line communication carrier apparatus according to any one of claims 24 to 28, wherein the wavelet inverse transformer and the wavelet transformer are configured by a lattice bank filter bank circuit.
JP2002015058A 2002-01-24 2002-01-24 Power line carrier communication equipment Active JP3931666B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002015058A JP3931666B2 (en) 2002-01-24 2002-01-24 Power line carrier communication equipment

Applications Claiming Priority (14)

Application Number Priority Date Filing Date Title
JP2002015058A JP3931666B2 (en) 2002-01-24 2002-01-24 Power line carrier communication equipment
AU2003237796A AU2003237796A1 (en) 2002-01-24 2003-01-22 Method of and system for power line carrier communications
KR20097002757A KR100972593B1 (en) 2002-01-24 2003-01-22 Method of and system for power line carrier communications
KR10-2004-7011484A KR20040073592A (en) 2002-01-24 2003-01-22 Method of and system for power line carrier communications
EP10174402A EP2259442A1 (en) 2002-01-24 2003-01-22 Method of and system for power line carrier communications
EP03731823.5A EP1468503B1 (en) 2002-01-24 2003-01-22 Method of and system for power line carrier communications
PCT/JP2003/000556 WO2003063380A2 (en) 2002-01-24 2003-01-22 Method of and system for power line carrier communications
CNB038045168A CN100574132C (en) 2002-01-24 2003-01-22 Device for power line carrier communications
ES03731823.5T ES2550821T3 (en) 2002-01-24 2003-01-22 Method and system for carrier communications by power line
US10/349,648 US7023324B2 (en) 2002-01-24 2003-01-23 Power-line carrier communication apparatus
TW92101607A TWI302064B (en) 2002-01-24 2003-01-24 Power-line carrier communication apparatus
US11/362,502 US7498935B2 (en) 2002-01-24 2006-02-27 Power-line carrier communication apparatus
US12/345,423 US7800491B2 (en) 2002-01-24 2008-12-29 Power-line carrier communication apparatus
US12/862,598 US8072323B2 (en) 2002-01-24 2010-08-24 Power-line carrier communication apparatus

Publications (2)

Publication Number Publication Date
JP2003218831A JP2003218831A (en) 2003-07-31
JP3931666B2 true JP3931666B2 (en) 2007-06-20

Family

ID=27651571

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2002015058A Active JP3931666B2 (en) 2002-01-24 2002-01-24 Power line carrier communication equipment

Country Status (2)

Country Link
JP (1) JP3931666B2 (en)
CN (1) CN100574132C (en)

Families Citing this family (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2550821T3 (en) 2002-01-24 2015-11-12 Panasonic Corporation Method and system for carrier communications by power line
US7164724B2 (en) * 2002-09-25 2007-01-16 Matsushita Electric Industrial Co., Ltd. Communication apparatus
EP1639774B1 (en) 2003-06-18 2009-06-03 Panasonic Corporation Method and apparatus for receiving digital multicarrier signals using a wavelet transform
US7680208B2 (en) 2004-02-25 2010-03-16 Nokia Corporation Multiscale wireless communication
JP4637498B2 (en) 2004-04-16 2011-02-23 パナソニック株式会社 Communication apparatus and communication method
JP4754268B2 (en) 2004-05-27 2011-08-24 パナソニック株式会社 Communication device, communication system, and communication method
JP4464403B2 (en) * 2004-06-04 2010-05-19 パナソニック株式会社 Wireless communication device
JP5052742B2 (en) * 2004-07-22 2012-10-17 パナソニック株式会社 Transmitting apparatus and communication system using the same
JP4543817B2 (en) * 2004-08-13 2010-09-15 パナソニック電工株式会社 Power line carrier communication equipment
EP1643658A1 (en) * 2004-10-04 2006-04-05 Sony Deutschland GmbH Power line communication method
DE102004059940A1 (en) * 2004-12-13 2006-06-14 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. A signal converter for converting a start signal into an end signal and a method for converting a start signal into an end signal
JP4606149B2 (en) 2004-12-16 2011-01-05 パナソニック株式会社 Receiving apparatus and receiving method
JP4602073B2 (en) 2004-12-28 2010-12-22 パナソニック株式会社 Communication apparatus and communication method
JP4852246B2 (en) 2005-01-04 2012-01-11 パナソニック株式会社 Communication device, integrated circuit, and communication method
JP4699113B2 (en) * 2005-07-05 2011-06-08 パナソニック株式会社 Multi-carrier communication apparatus and multi-carrier communication method
JP2007036491A (en) * 2005-07-25 2007-02-08 Matsushita Electric Ind Co Ltd Transmitter, receiver, and control method thereof
JP4555185B2 (en) * 2005-07-25 2010-09-29 パナソニック株式会社 Transmitter, receiver and control method thereof
JP4895557B2 (en) 2005-09-16 2012-03-14 パナソニック株式会社 Multi-carrier communication apparatus and multi-carrier communication method
JP4749815B2 (en) 2005-09-27 2011-08-17 パナソニック株式会社 Multi-carrier communication apparatus, multi-carrier communication system, and multi-carrier communication method
KR100842259B1 (en) * 2006-04-21 2008-06-30 한국전자통신연구원 Human body communication method using multi-carrier modulation
CN1988402B (en) * 2006-10-10 2011-04-20 东南大学 Method for realizing power line carrier communication system
JP4835392B2 (en) * 2006-11-06 2011-12-14 住友電気工業株式会社 Power line communication apparatus and power line communication network system
JP5448359B2 (en) * 2007-05-30 2014-03-19 パナソニック株式会社 Power line communication method, power line communication apparatus, and power line communication system
JP5152967B2 (en) 2007-10-12 2013-02-27 パナソニック株式会社 COMMUNICATION METHOD, COMMUNICATION DEVICE, AND COMMUNICATION SYSTEM,
JP5157480B2 (en) * 2008-01-28 2013-03-06 富士通株式会社 Relay device and communication control method
US8411451B2 (en) 2008-07-30 2013-04-02 Panasonic Corporation Power line communication apparatus
JP5129087B2 (en) * 2008-10-27 2013-01-23 三菱電機株式会社 Power line communication device
CN101651472B (en) * 2009-07-22 2012-06-13 冯汉春 Carrier wave communication device of power line and carrier wave communication method thereof
JP5102862B2 (en) * 2010-06-02 2012-12-19 シャープ株式会社 Indoor wiring termination state determination device, PLC adapter, indoor wiring termination state determination method
JP5874025B2 (en) * 2010-08-05 2016-03-01 パナソニックIpマネジメント株式会社 Remote meter reading system, information terminal, communication device, distribution board
JP4973788B2 (en) * 2011-01-11 2012-07-11 パナソニック株式会社 Transmitting apparatus and communication system using the same
CN102684746A (en) * 2012-01-11 2012-09-19 华北电网有限公司计量中心 Method and device for adjusting transmission characteristics of carrier narrow-band signal of power line
CN102571152A (en) * 2012-03-02 2012-07-11 钜泉光电科技(上海)股份有限公司 Control device of transmitted power of power line carrier communication
CN102611481B (en) * 2012-03-16 2016-04-27 北京晓程科技股份有限公司 A kind of power-line carrier communication method and system thereof
JP5650255B2 (en) 2013-01-17 2015-01-07 株式会社リブ技術研究所 Power line carrier communication equipment
JP5604538B2 (en) 2013-01-28 2014-10-08 株式会社リブ技術研究所 Receiver circuit for power line carrier communication
CN103297091B (en) * 2013-05-10 2015-03-04 中国科学院微电子研究所 Power line communication transmission system and power line communication receiving system
CN103532591B (en) * 2013-10-28 2015-09-23 国家电网公司 Based on voltage Power Line Carrier Channel attenuation test system and the method thereof of orthogonal signalling
CN105788224A (en) * 2016-02-15 2016-07-20 黄焕珠 Control device for household power line carrier
CN107896114B (en) * 2016-09-29 2020-04-21 华为技术有限公司 Method, device and system for receiving and sending signals
CN107612865B (en) * 2017-10-12 2020-06-02 国网天津市电力公司电力科学研究院 Signal noise reduction method applied to low-voltage power line carrier communication
US10594366B2 (en) * 2018-04-26 2020-03-17 RayMX Microelectronics, Corp. Storage device, memory controller circuit, and monitoring method thereof

Also Published As

Publication number Publication date
CN1703844A (en) 2005-11-30
JP2003218831A (en) 2003-07-31
CN100574132C (en) 2009-12-23

Similar Documents

Publication Publication Date Title
US8982985B2 (en) Pilot allocation in multi-carrier systems with frequency notching
Farhang-Boroujeny et al. Multicarrier communication techniques for spectrum sensing and communication in cognitive radios
ES2691295T3 (en) Procedure and signaling apparatus in an OFDM multiple access system
US7269782B2 (en) Orthogonal frequency division multiplexing/modulation communication system for improving ability of data transmission and method thereof
JP4057603B2 (en) Transmission method, reception method, transmission device, reception device
EP0439539B1 (en) Transmitter, transmission method and receiver
US5790516A (en) Pulse shaping for data transmission in an orthogonal frequency division multiplexed system
US7058140B2 (en) Sliding-window multi-carrier frequency division multiplexing system
ES2368020T3 (en) Procedure for transmitting a signal on a power line channel and a communication modem for power line.
US6657949B1 (en) Efficient request access for OFDM systems
JP4087812B2 (en) Channel estimation apparatus and method in orthogonal frequency division multiplexing system using multiple antennas
US6954421B2 (en) Orthogonal frequency division multiplexing receiver device
KR100366751B1 (en) Wideband FFT Channel Riser
JP3800503B2 (en) Multi-carrier signal generation method
JP3999271B2 (en) Reduction of average power-to-peak ratio in multi-carrier modulation systems
TW533685B (en) Peak suppression method and data transmission apparatus
US8416757B2 (en) Radio transmission device
US6657950B1 (en) Optimal filtering and upconversion in OFDM systems
KR101064355B1 (en) Location of wideband ofdm transmitters with limited receiver bandwidth
Budiarjo et al. Cognitive radio modulation techniques
US6351473B1 (en) Method to allocate data bits, multi-carrier transmitter and receiver using the method, and related allocation message generator
TWI351837B (en) Beamforming by antenna puncturing
US5757766A (en) Transmitter and receiver for orthogonal frequency division multiplexing signal
US7215635B2 (en) Apparatus for transmitting and receiving signal using orthogonal codes and non-binary values in CDMA/OFDM system and method thereof
US5663986A (en) Apparatus and method of transmitting data over a coaxial cable in a noisy environment

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20050117

RD01 Notification of change of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7421

Effective date: 20050704

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20061128

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20070126

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20070220

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20070305

R151 Written notification of patent or utility model registration

Ref document number: 3931666

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R151

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100323

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110323

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110323

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120323

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130323

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130323

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140323

Year of fee payment: 7