WO2000018048A1 - Dispositif et procede de communication sur ondes porteuses multiples - Google Patents
Dispositif et procede de communication sur ondes porteuses multiples Download PDFInfo
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- WO2000018048A1 WO2000018048A1 PCT/JP1999/005129 JP9905129W WO0018048A1 WO 2000018048 A1 WO2000018048 A1 WO 2000018048A1 JP 9905129 W JP9905129 W JP 9905129W WO 0018048 A1 WO0018048 A1 WO 0018048A1
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- data
- multicarrier
- frequency
- fourier transform
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/04—Arrangements for detecting or preventing errors in the information received by diversity reception using frequency diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
Definitions
- the present invention relates to a multi-carrier communication apparatus and a multi-carrier communication method.
- the present invention relates to a multi-carrier communication device and a multi-carrier communication method for performing data communication by a multi-carrier modulation / demodulation method.
- Power line communication which uses existing power lines to communicate with power line modems without newly establishing communication lines and controls machines connected by power lines, is attracting attention.
- power line communication is a method of performing communication using a power line that supplies power to various electric devices in buildings, homes, factories, and the like.
- power line communication is performed by a variety of electric devices connected to the power line. Noise had to be considered, and measures against these noises were indispensable. Therefore, Japanese Patent Application Laid-Open -A signal frequency selection method described in Japanese Patent Publication No.
- the present invention is, c for the purpose of optimum low cost Bok at a transmission rate for small offices or home such network is fast, provides a strong Maruchikiyaria communication apparatus and Maruchikiyaria communication method to the noise Disclosure of the invention
- a multicarrier encoding means for modulating input data by a multicarrier modulation method and encoding the data into multicarrier data in which a frequency interval between carriers is a reference frequency; Cut-off means for cutting off the bandwidth of each carrier in the multi-carrier data of the multi-carrier modulation / demodulation system from the conversion means to a predetermined multiple, and inverse Fourier transform of the multi-carrier data from the force cut-off means.
- Inverse Fourier transform means, and multicarrier data from the inverse Fourier transform means are upsampled by the predetermined multiple, and the intercarrier frequency is a predetermined multiple of the reference frequency, and the bandwidth of each carrier is multicarrier encoded.
- Upsampling means for outputting multicarrier data having the same band as the band, and transmission means for transmitting multicarrier data from the upsampling means are provided. Also, in the following invention, receiving means for receiving multicarrier data in which a frequency interval between carriers is a predetermined multiple of a reference frequency; Down-samples the received multi-carrier data by a factor of the predetermined multiple, and sets the inter-carrier frequency to the reference frequency and the band of each carrier to the band of each carrier of the multi-carrier data received by the receiving means.
- Down-sampling means for outputting multi-carrier data reduced to a predetermined multiple of the above, a Fourier transform means for performing a Fourier transform on the multi-carrier data from the down-sampling means, and a multi-carrier from the Fourier transform means.
- decoding means for decoding data.
- a multi-carrier encoding means for modulating input data by a multi-carrier modulation method and encoding the multi-carrier data with a frequency interval between carriers as a reference frequency, and the above-mentioned multi-carrier encoding
- a cut-off means for cutting off the band of each carrier in the multi-carrier modulation / demodulation multi-carrier data by a predetermined multiple, and an inverse Fourier transforming the multi-carrier data from the power cut-off means.
- Inverse Fourier transform means for converting, and multicarrier data from the inverse Fourier transform means are sampled at the predetermined multiple, the inter-carrier frequency is a predetermined multiple of the reference frequency, and the band of each carrier is multicarrier encoded.
- Band of each carrier of multi-carrier data encoded by means Up-sampling means for outputting multi-carrier data, transmitting means for transmitting multi-carrier data from the up-sampling means, and receiving means for receiving multi-carrier data whose frequency interval between carriers is a predetermined multiple of a reference frequency
- the multicarrier data received by the receiving means is downsampled by a factor of the predetermined multiple, and the carrier frequency is the reference frequency, and the band of each carrier is received by the receiving means.
- a downsampler that outputs multi-carrier data that is a multiple of the predetermined multiple for each carrier band of data.
- Coupling means Fourier transform means for Fourier transforming the multicarrier data from the downsampling means, and decoding means for decoding the multicarrier data from the Fourier transform means.
- decoding means for decoding the multicarrier data from the Fourier transform means.
- the multi-carrier encoding means when encoding data on each carrier, outputs multi-carrier data in which the channel of the data encoded on each carrier is changed every time:
- a multi-carrier encoding means for modulating input data by a multi-carrier modulation method to encode only one of the multi-carriers, and a multi-carrier data from the multi-carrier encoding means.
- Inverse Fourier transform means for performing an inverse Fourier transform
- cut-off means for cutting off multicarrier data output from the inverse Fourier transform means at a predetermined frequency
- transmitting means for transmitting.
- receiving means for receiving multi-carrier data in which the same data is encoded on each carrier constituting the multi-carrier, and coding each carrier based on the multi-carrier data received by the receiving means.
- multi-carrier decoding means for decoding the same encoded data.
- the multi-carrier decoding means includes: an S / N measuring means for measuring the SZN of each carrier constituting the multi-carrier data received by the receiving means; and a receiving means based on the measurement output of the S / N measuring means.
- Carrier selecting means for selecting the carrier data having the highest SZN from the obtained multi-carrier data, and the carrier data selected by the carrier selecting means.
- Frequency axis data converting means for converting the frequency axis data into frequency axis data
- decoding means for decoding the frequency axis data from the frequency axis data converting means.
- the multi-carrier decoding means is a Fourier transform means for performing a Fourier transform on the multi-carrier data received by the receiving means, and an SZN for measuring the SZN of each carrier constituting the multi-carrier data from the Fourier transform means.
- decoding means for decoding the selected carrier data.
- the multicarrier decoding means includes: a carrier extracting means for extracting the multicarrier data received by the receiving means for each carrier; converting the data extracted for each carrier by the carrier extracting means to the same frequency; Adjusting means for performing adjustment; adding means for adding an output for each carrier from the adjusting means; frequency axis data converting means for converting addition data from the adding means into frequency axis data; Decoding means for decoding frequency axis data from the data conversion means.
- the multi-carrier decoding means further includes an SZN measuring means for measuring each SZN of the data extracted for each carrier by the carrier extracting means, and the carrier extracting means based on the measurement output of the SZN measuring means.
- Gain setting means for setting the data gain for each carrier; andadjusting means for converting the data extracted for each carrier by the carrier extracting means to the same frequency, and for adjusting the phase. The gain is adjusted based on the gain set by the gain setting means.
- the multi-carrier decoding means includes a Fourier transform means for Fourier transforming the multi-carrier data received by the receiving means, and a phase adjustment for the multi-carrier data Fourier transformed by the Fourier transform means for each carrier. And an adder for adding an output of each carrier from the adjuster, and a decoder for decoding the added data from the adder.
- the multi-carrier decoding means further includes: an SZN measuring means for measuring, for each carrier, an SZN of each carrier constituting the multi-carrier data Fourier-transformed by the Fourier transform means; and a measurement output of the SZN measuring means.
- Gain setting means for setting the gain of the multi-carrier data from the Fourier transform means on a carrier-by-carrier basis, wherein the adjusting means adjusts the phase of the Fourier-transformed multi-carrier data for each carrier. At the same time, the gain is adjusted based on the gain set by the gain setting means.
- the multicarrier decoding means includes a Fourier transform means for Fourier-transforming the multicarrier data received by the receiving means, and multicarrier data Fourier-transformed by the Fourier transform means for each carrier.
- Decoding means for decoding, and decoding means for inputting decoded data decoded for each carrier by the decoding means, judging the decoded data having the largest input, and outputting the decoded data.
- the transmission means transmits the multicarrier data via the power line.
- FIG. 1 is a diagram showing an overall configuration of a power line communication device which is a first embodiment of a multi-carrier communication device according to the present invention.
- FIGS. 2 (a) to 2 (e) each show the embodiment shown in FIG.
- FIGS. 3 (a) to 3 (c) show the frequency spectrum of the multi-carrier data at each point in the power line communication device of embodiment 1 on the frequency axis.
- FIG. 4 is a diagram showing an encoding sequence of data by a PN sequence to a carrier, FIG.
- FIG. 4 is a diagram showing an entire configuration of a third embodiment of the multicarrier communication apparatus according to the present invention
- FIGS. 5 (a) to (d) are FIG. 4 is a diagram showing, on the frequency axis, the frequency spectrum of the multicarrier data at each point in the power line communication device according to the third embodiment shown in FIG. 4, and
- FIG. Multi-carrier a diagram showing a partial configuration of Embodiment 4 of the communication device, 7 (a) to (f) are diagrams showing the frequency spectrum of the multicarrier data at each point in the power line communication apparatus of Embodiment 6 shown in FIG. 4 on the frequency axis, and FIG. FIGS.
- FIG. 10 is a diagram showing a frequency spectrum of the multicarrier data of FIG. 10 on the frequency axis.
- FIG. 10 is a diagram showing a partial configuration of the multicarrier communication apparatus according to the sixth embodiment of the present invention.
- (a) to (h) are diagrams showing the frequency spectrum of multicarrier data at each point in the power line communication apparatus according to the sixth embodiment shown in FIG. 10 on the frequency axis, and
- FIGS. 13 (a) to 13 (g) each show a partial configuration of the seventh embodiment.
- FIGS. 13 (a) to 13 (g) show the frequency spectrum of the multicarrier data at each point in the power line communication apparatus of the seventh embodiment shown in FIG.
- FIG. 14 is a diagram showing a vector on the frequency axis.
- FIG. 14 is a diagram showing a partial configuration of the multicarrier communication apparatus according to the eighth embodiment of the present invention.
- FIG. 1 is a diagram showing a frequency spectrum of multicarrier data at each point in a communication device on a frequency axis.
- a power line communication device such as a power line modem that communicates via a power line
- the carrier communication device is limited to the power line communication device.
- the application of the present invention to a power line communication device is merely an example, and the present invention provides a wired or wireless multi-carrier via a communication line other than a power line communication device, such as a normal dedicated communication line. It is applied to a modulation / demodulation type multi-carrier communication device.
- a DMT (Discrete MultiTone) modulation method will be described as an example of a multi-carrier modulation method, but the present invention is limited to this DMT modulation / demodulation method.
- an OI 4 DM (Orthogonal Frequency Division Multiplex modulation / modulation method) or the like may be used.
- a multicarrier modulation / demodulation method may be used.
- FIG. 1 is an overall configuration diagram of a power line communication device which is a first embodiment of a multicarrier communication device according to the present invention, which is a power line modem having both a transmission system and a reception system. Then, in Figure 1, 1
- 1 is a data divider
- 12 is a 4-carrier (tone) output QAM encoder as a multi-carrier encoding means
- 12a to 12d are low-pass filters (LPF) as power-off means
- 13 is a 4-input, 8-output inverse Fourier transform circuit (IFFT)
- 14 is a parallel-to-serial converter (PZS)
- 14a is an upsampling circuit
- 15 is a DZA converter
- the configuration of the transmitting side of the multicarrier communication apparatus can also be expressed by a configuration such as a secondary modulation unit or a multicarrier modulation unit.
- the configuration of the first embodiment shown in FIG. the QAM encoder 12 corresponds to the first-order modulation section, a single-pass filter (LPF) 12a to 12d, an inverse Fourier transform circuit (IFFT) 13 and a node:
- the conversion circuit (PZS) 14 and the up-sampling circuit 14a correspond to a multi-modulation section.
- reference numeral 19 denotes an LPF
- reference numeral 20 denotes a receiving unit
- reference numeral 21 denotes a sample hold circuit
- reference numeral 22 denotes a converter.
- 2 2 a is a down-sampling circuit
- 2 3 is a serial-to-parallel converter (SZP)
- 24 is an 8-input 4-input Fourier transform circuit (F FT)
- 24 a to 24 d are low-pass filters (LPF).
- Reference numeral 25 denotes a 0 1 ⁇ decoder
- reference numeral 26 denotes a data synthesizer.
- the QAM decoder 25 corresponds to a first-order demodulator, a low-pass filter (LPF) 24a to 24d, a Fourier transform circuit (FFT) 24, a serial-to-parallel converter circuit (SZP) 23 and the down-sampling circuit 22 a correspond to the multi-carrier demodulation unit.
- 2 (a) to 2 (e) show the frequency spectrum of the multicarrier data at each point in the power line communication device of the first embodiment shown in FIG. 1 on the frequency axis. Specifically, (a) shows the frequency spectrum of the multicarrier data output from the QAM encoder 12 and (b) shows the frequency spectrum of the multicarrier data output from the single-pass filters 12a to 12d.
- (C) is the frequency spectrum of the multi-carrier data output from the parallel-to-serial conversion circuit (P / S) 14
- (d) is the multi-carrier data output from the up-sampling circuit 14a frequency spectrum
- (e) shows a frequency bitch torr multicast rear data output from the down-sampling circuit 2 2 a c
- the data divider 11 divides the input data into a plurality of bit strings
- the QAM encoder 12 converts the data divided by the data divider 11 into a QAM.
- the DMT (Discrete MultiTone) modulation / demodulation system is composed of four carriers (tones) whose frequency band W and frequency interval ⁇ f are the reference frequency (4.3125 KHZ), as shown in Fig. 2 (a). It is encoded into key data and output.
- QAM encoder 12 is configured based on a preset output modulation frequency, the number of frequency carriers (4 in the first embodiment), and the number of signal points. Then, the input data divided by the data divider 11 is encoded into each of the four carriers of the multicarrier. However, as described later, since the frequency band of WZ4 or higher is cut off by the low-pass filter 12a to 12d in each carrier, the QAM encoder 12 uses the carrier of WZ4 or lower in each carrier. Only encode data.
- the frequency band W and the frequency interval ⁇ f output from the QAM encoder 12 are DMT modulated and demodulated to the reference frequency (4.3125KHZ) by the DMT modulation / demodulation multicarrier.
- the data is input to a single-pass filter (LPF) 12a ⁇ as a power-off means: 12d, and as shown in Fig. 2 (b), a low-pass filter (LPF) 12a ⁇ : 1 2d Cuts off the frequency band of each carrier to a predetermined multiple (for example, 1/4 in the first embodiment), creates multi-carrier data with a frequency band of WZ4, and performs inverse processing.
- LPF single-pass filter
- LPF low-pass filter
- the inverse Fourier transform circuit 13 performs an inverse Fourier transform on the DMT modulation / demodulation multicarrier data having a frequency interval ⁇ f of 4.3125 KHZ and a frequency band of 4.3125 / 4 KHz of WZ4, and converts the frequency axis data into time axis data.
- the parallel-to-serial converter (PZS) 14 outputs the data to the parallel-to-serial converter (P / S) 14.
- the parallel-to-serial converter (P / S) 14 uses the parallel multicarrier data output from the inverse Fourier transform circuit 13 as shown in Fig. 2 (c). As shown in (1), serial conversion is performed and output to the aza sampling circuit 14a.
- the up-sampling circuit 14a up-samples the serially converted serial multi-carrier data as shown in FIG. 2 (c) by the predetermined multiple of 4 times as shown in FIG. 2 (c), and as shown in FIG. 2 (d).
- the up-sampled serial multicarrier data is converted into an analog signal as shown in Fig. 2 (d) and transmitted. Amplifies the analog-converted serial multicarrier data based on the transmission frequency specified by the transmission output controller 28, and provides a low-pass filter (LPF).
- LPF low-pass filter
- the low-pass filter (LPF) 17 powers off the up-sampled analog serial multicarrier data at the specified cutoff frequency as shown in Fig. 2 (d), and the specified poweroff. Only multi-carrier data consisting of four carriers below the frequency are output to the power line coupling circuit 18, and the power line coupling circuit 18 outputs four carriers on the power line 30.
- LPF low-pass filter
- multi-carrier data consisting of only four carriers shown in FIG. 2 (d), that is, 4 ⁇ 4.3125KHZ with a carrier frequency interval of 4 ⁇ ⁇ f 4 X WZ rear frequency band
- substantially 16 carriers from the 16-output QAM encoder are input by a 16-input, 3-output inverse Fourier transform circuit. Then, 16 carriers are created, and this carrier is thinned out for every four carriers, which is the same as the frequency spectrum of the multicarrier data composed of four carriers.
- the transmission system of the power line communication device 27 of the first embodiment even when the noise from the power line 30 is concentrated in a certain frequency band, as shown in FIG. Since the frequency band of the entire multicarrier data output on 0 is four times wider than that of the inverse Fourier transform circuit 13 output, data transmission that is more resistant to power line noise is possible.
- the frequency band of the entire multicarrier data communicating on the power line 30 is, for example, 4 ⁇ 4 ⁇ Even when ⁇ f is set to 16 ⁇ 4.3125 KHz, according to the transmission system of the power line communication device 27 of the first embodiment, the single-pass filter (LPF) 12 a to 12 d and the up- By simply adding a sampling circuit 14a, a 4-carrier output QAM encoder 12 and 4-input 8-output inverse Fourier transform circuit 13 can be used, so 16 16-output QAM encoders can be used.
- LPF single-pass filter
- Two-output inverse Fourier transform circuit inputs creates 16 carriers, thins out 3 carriers for every 4 carriers, and uses QAM compared to multi-carrier data consisting of 4 carriers.
- the number of inputs and outputs of the encoder and inverse Fourier transform circuit is reduced, and the use of inexpensive QAM encoders and inverse Fourier transform circuits can greatly reduce costs:
- a high-speed power line communication device that receives multicarrier data having frequency band W and frequency interval ⁇ f of the reference frequency (4.3125 KHZ) is provided. Even in the case of data transmission, if the low-speed power line communication device 27 according to the first embodiment determines in advance which multicarrier the data is to be encoded between the two power line communication devices, The high-speed power line communication device can capture multicarrier data from the low-speed power line communication device of the first embodiment, and can perform data communication with the high-speed power line communication device without any improvement. .
- the frequency interval is 4 X 4.3125 KHz with 4 X ⁇ f
- the power line coupling circuit (HPF) 18 fetches, from the power line 30, multi-carrier data consisting of four carriers having frequency intervals and frequency bands as shown in FIG. (LP F) 19 removes noise from the serial multi-carrier data received via the power line coupling circuit 18, converts the received AMP 20 to a voltage level that falls within the control range of the A / D converter 22, and Output to hold circuit 21.
- the sample hold circuit 21 holds the serial multicarrier data whose voltage level has been converted based on the signal from the oscillator 29 B for the conversion time of the AZD converter, and converts the A / D converter
- the A / D converter 22 converts the serial multi-carrier data into an analog-to-digital signal and outputs it to the down-sampling circuit 22a:
- the down-sampling circuit 22a performs down-sampling processing which is the reverse of the up-sampling processing of the up-sampling circuit 14a, and generates multi-carrier data having a frequency spectrum as shown in Fig. 2 (d).
- the frequency interval of each carrier is 4.3125KHZ of 1 ⁇ 4 ⁇ 4 ⁇ ⁇ f
- the multi-carrier data is converted into multi-carrier data which is 4 ⁇ 4.3125 KHz of S 4 4 ⁇ 4 ⁇ 4 XAf.
- the multicarrier data of the frequency spectrum shown in FIG. 2D is converted into the multicarrier data of the frequency spectrum shown in FIG. 2E.
- the parallel-serial conversion circuit (P / S) 14 After output, the up-sampling circuit 14a returns to the state of the multicarrier data before input.
- the multicarrier data after down-sampling shown in Fig. 2 (e) has four carrier cards by the LPF 17 on the transmitting side.
- serial-to-parallel converter (S / P) 23 converts the serial multi-carrier data output from the down-sampling circuit 22 a into parallel data as shown in Fig. 2 (e). And outputs it to a Fourier transform circuit (F FT) 24.
- the Fourier transform circuit (F FT) 24 performs a Fourier transform on the parallel multicarrier data:
- the multi-carrier data subjected to the Fourier transform processing of the Fourier transform circuit 24 is sent to a low-pass filter (LPF) 24 a to 24 d, and the low-pass filter (LPF) 24 a to 24 d is applied to each carrier of the multi-carrier data.
- LPF low-pass filter
- LPF low-pass filter
- the data combiner 26 combines the QAM-denided data to obtain received data.
- FIG. 7 the multi-carrier data output on the power line 30 has a frequency band that is four times as wide as that of the output of the inverse Fourier transform circuit 13 when it is received and processed.
- a 4-carrier output QAM encoder 25 and an 8-input 4-output Fourier transform circuit 24 can be used, so that 3 2 inputs 1 6 outputs
- the number of inputs and outputs of the QAM decoder and Fourier transform circuit is reduced compared to the case of using a Fourier transform circuit and a 16-input QAM decoder, and the cost is greatly increased by using inexpensive QAM dencoder and Fourier transform circuit. Can be reduced.
- the carrier has the same frequency band W, and the frequency interval ⁇ f is, for example, 4.3125 KHZ. Multicarrier frequency interval transmitted to
- the low-speed side If it is determined in advance that data is to be loaded only on the carriers constituting the multi-carrier of the power line communication device 27 of the first embodiment, high-speed power line communication with the power line communication device 27 of the first embodiment Data communication becomes possible with the device, and data communication with a high-speed power line communication device becomes possible without any improvement.
- the frequency band W of the carrier is the same, and the frequency interval f is equal to the frequency interval (4 ⁇ 4.3125 KHz) of the multicarrier transmitted on the power line 30 of the first embodiment.
- the power line communication device of the first embodiment can be used. Data communication can be performed between the device and a low-speed power line communication device:
- the QAM encoder 12 encodes each data divided by the data divider 11 into each carrier (tone), that is, different data is assigned to each carrier.
- the QAM encoder 12 encodes the data divided by the data divider 11 for each carrier (tone), that is, for each carrier.
- the same data may be encoded.
- the data transmission rate is reduced to 14 compared to the first embodiment, but the same data is transmitted to each of the four carriers having different frequencies. Because it is coded, even if a certain carrier is crushed by noise, another carrier can be used, so the noise resistance against power line noise is four times as large as that of the first embodiment. Boss, more reliable data communication is possible.
- a power line modem having both a transmission system and a reception system and capable of transmitting and receiving power lines has been described as an example.
- the system is configured so that only the transmission system is provided and only the transmission of the power line communication of the first embodiment is possible, or only the reception system of the first embodiment is provided and only the reception of the power line communication of the first embodiment is possible.
- the transmission system of the first embodiment and the reception system of the ordinary power line communication without the downsampling circuit 22a may be provided, or the reception system of the first embodiment and the single-pass filter 1 2a Of course, it may be configured to include a power line transmission system for ordinary power line communication that does not have the 12 d gap sampling circuit 14 a:
- the inverse Fourier transform circuit (IFFT) 13 and the Fourier transform circuit (FFT) 24 simply perform the inverse Fourier transform on the transmitting side or the free Fourier transform on the receiving side, respectively.
- the inverse Fourier transform means and the Fourier transform means, or the inverse Fourier transform and the Fourier transform, according to the present invention are equivalent to the inverse Fourier transform on the transmitting side or the Fourier transform on the receiving side. It is sufficient to obtain the conversion result, that is, the conversion result from the frequency axis signal to the time axis signal or vice versa.
- an inverse Fourier transform circuit (IFFT) 13 or a Fourier transform circuit (FFT) 24 instead, a QAM modulator or QAM demodulator may be provided to perform modulation or demodulation equivalent to inverse Fourier transform or Fourier transform, or to obtain the results of inverse Fourier transform and Fourier transform in advance.
- an inverse Fourier transform means for reading out the result of the inverse Fourier transform and the Fourier transform from the memory by a look-up table method and outputting the result when the data is inputted.
- Fourier transform means or inverse Fourier transform and Fourier transform may be used.
- FIGS. 3 (a) to 3 (c) show the encoding order of data by PN sequence to each carrier according to the second embodiment.
- (a) shows the order of data encoding by the PN sequence at time A, and the channel CH 1 divided by the data divider 11 into each of the four multicarriers from low frequency to high frequency.
- each of the data is encoded in the order of channel CH1 to CH4, and (b) shows the PN sequence at the next time A-1. Therefore, each data of channels CH1 to CH4 divided by data divider 11 is encoded in order of CH4, CH3, CH1, CH2 for each of the four multicarriers from low frequency to high frequency.
- each data of channels CH 1 to 4 divided by data divider 11 into four multi-carriers from low frequency to high frequency in accordance with the PN sequence is encoded.
- the channel of the data coded to each carrier is different for each time, so that even if a certain carrier is continuously crushed by noise, data can be transmitted and received by other carriers.
- the data of a specific channel will not be lost continuously, and even if different data is encoded for each carrier, noise immunity to power line noise will be improved, enabling more reliable data communication become.
- the frequency band W of the carrier is the same, and the frequency interval ⁇ f is the same as that of the first embodiment.
- Power line communication that is faster or slower than the first embodiment that communicates multi-carrier data that is a divisor or a multiple of the multi-carrier frequency interval (4 ⁇ 4.3125 KHZ) transmitted on the power line 30 Even in the case of performing data communication with a device, between these two power line communication devices, data is loaded only on a carrier constituting a multi-carrier of the low-speed side power line communication device, and is encoded and decoded.
- the power line communication apparatus of the second embodiment can operate at higher speed or lower speed.
- a high-speed power line communication device it is possible to send and receive multi-carrier data in PN sequence without any improvement:
- FIG. 4 is an overall configuration diagram of a third embodiment of the multicarrier communication apparatus according to the present invention.
- a power line modem having both a transmission system and a reception system according to-in FIG. 4 reference numeral 31 denotes a cut-off frequency, a cut-off adjustment circuit for adjusting a phase and a gain of the LPF 17, and other configurations include: Since they are the same as the components of the first embodiment shown in FIG. 1, the same numbers are assigned and the explanations are omitted.
- FIGS. 5 (a) to 5 (d) show, on the frequency axis, the frequency spectrum of the multicarrier data at each point in the power line communication apparatus according to the third embodiment shown in FIG.
- (a) is the frequency spectrum of the multicarrier data output from the QAM encoder 12, and
- (b) is the inverse Fourier transform target of the inverse Fourier transform circuit (IF FT) 13 ⁇ .
- (a) shows the frequency spectrum of multicarrier data data obtained by calculating the conjugate complex number of the multicarrier data and adding the inverted data.
- (c) is output from the parallel-to-serial conversion circuit (PZS) 14.
- (D) is a low-pass filter (LPF)
- the frequency spectrum of the multicarrier data output from 17 is shown respectively.
- the data divider 11 divides the input data into a plurality of bit strings, and the QAM encoder 12 becomes the data divider 11.
- QAM code the divided data
- the DMT (Discrete MultiTone) modulation and demodulation method which consists of four carriers (tones) in the frequency band W (4.312 ⁇ ), has only one carrier, such as the carrier number as shown in Fig. 5 (a). Encode and output the divided data only to the first carrier of 0, and do not output other carriers of carrier numbers 1 to 3:
- the frequency interval output from the QAM encoder 12 is 4.3125 KHZ
- the frequency band is 4.3125 KHZ
- the data is encoded only in the first carrier of carrier number 0.
- the multi-carrier data is input to an inverse Fourier transform circuit 13, which inverts the multi-carrier data by taking the conjugate complex number of the multi-carrier data to obtain a diagram as shown in FIG. 5 (b).
- 5 Multi-carrier data of 8 XW is created by inverting and folding the multi-carrier data shown in (a), performing inverse Fourier transform, converting frequency axis data to time axis data, and parallel-serial Output to conversion circuit (PZS) 14.
- the Laerleux serial converter (PZS) 14 converts the parallel multicarrier data output from the inverse Fourier transform circuit 13 into serial data as shown in Fig. 5 (c) and outputs it to the DZA converter 15. .
- the converter 15 converts the serial multi-carrier data into an analog signal as shown in FIG. 5 (c), and the transmission AMP 16 amplifies the analog-converted serial multi-carrier data as shown in FIG. L
- the cut-off frequency adjusted by the cut-off adjusting circuit 31 turns off the serial multi-carrier data shown in Fig. 5 (c) above that frequency. Then, in FIG. 5 (d), a serial multicarrier data consisting of four carriers below the cut-off frequency is output to the power line coupling circuit 18 and the power line coupling circuit 18 Send the serial / multicarrier data on line 30 :, so on power line 30, the same data is applied to each of the four carriers below the cutoff frequency in Fig. 5 (d). Is encoded, and the multicarrier data whose four carrier frequency interval is 8 X4.3125KHz of 8XW ( ⁇ f) and the frequency band of each of the four carriers is 4.3125KHz of W is output. Will be.
- each carrier frequency interval where the same data is encoded is 8 X 4.3125KHz of 8XW ( ⁇ f), and the carrier frequency band is W of 4.3125KHZ.
- the communication partner The receiving system of a certain power line communication device 27 performs an operation opposite to the above-described operation of the transmitting system. That is, the power line coupling circuit (HPF) 18 takes in multicarrier data as shown in FIG. 5D from the power line 30, and then the mouth-to-pass filter (LPF) 19 receives the power line coupling circuit 1.
- the noise is removed from the serial multi-carrier data received via 8 and converted to a voltage level such that the receiving AMP 20 is within the control range of the AZD converter 22 and output to the sample hold circuit 21:
- the serial multicarrier data whose voltage level has been converted is used for conversion by the A / D converter.
- the output is output to the A / D converter 22.
- the A / D converter 22 converts the serial multicarrier data from analog to digital. Up to this point, the operation is the same as that of the receiving system of the first embodiment:
- the serial-to-parallel conversion circuit (SZP) 23 converts the serial data from the AZD converter 22 into parallel data and outputs the parallel data to the Fourier transform circuit (FFT) 24, which performs Fourier transform.
- the circuit (FFT) 24 performs a Fourier transform of the normal data, converts the multi-carrier data on the time axis to the multi-carrier data on the frequency axis, and outputs it to the QAM decoder 25.
- the carrier is not affected by noise or is least affected by noise. Only the carrier is taken in, QAM decoded and decoded, and output to the data combiner 26.
- the data combiner 26 combines the QAM decoded data to obtain received data.
- multicarrier data in which the same data is encoded is received by any of the four subcarriers that make up the multicarrier with a carrier frequency interval of 8 X4.3125 KHz of 8 XW ( ⁇ f).
- carrier data in an arbitrary frequency band that is less affected by noise is decoded, data reception that is more resistant to power line noise can be realized with an inexpensive configuration.
- the carrier similarly to the power line communication devices of the first and second embodiments, the carrier has the same frequency band W and the frequency interval ⁇ f is the same as the power line communication device of the first and second embodiments.
- the information transmitted on power line 30 is Even when performing data communication with a power line communication device that is higher or lower than Embodiment 3 that communicates multi-carrier data that is a divisor or a multiple of the multi-carrier frequency interval (8 X 4.3125 KHZ). If it is determined beforehand between these two power line communication apparatuses whether to carry out data encoding and decoding only on a carrier constituting a multi-carrier of the low-speed side power line communication apparatus, the present embodiment will be described.
- the power line communication device of No. 3 can transmit and receive multi-carrier data to and from a higher speed or lower speed power line communication device without any improvement.
- Embodiment 4 and the following Embodiments 5 to 8 are characterized only by the configuration of the receiving system of the multicarrier communication apparatus according to the present invention.
- a description will be given assuming that a transmission system device for transmitting multicarrier data transmits multicarrier data obtained by encoding the same data to a plurality of carriers constituting a multicarrier.
- FIG. 6 is a partial configuration diagram of Embodiment 4 of the multicarrier communication apparatus according to the present invention, and shows only the configuration after serial-to-parallel conversion circuit (SZP) 23 in the receiving system according to the present invention. . Therefore, Embodiment 4 can be combined with the transmission systems of Embodiments 1 to 3 above.
- a Fourier transform circuit (F FT) 24, a single pass filter (LPF) 24a 24d the configuration of a part to be inserted in place of the QAM decoder 25 and the data synthesizer 26 is shown.
- F FT Fourier transform circuit
- LPF single pass filter
- 25 is a QAM decoder
- 26 is a data synthesizer
- 31 is S / N measurement circuit
- 32 is a carrier selection circuit
- 33 is a bandpass filter (BPF) as carrier selection means
- 34 is a QAM demodulator as frequency axis data conversion means-Fig. 7 (a) To ( ⁇ ) indicate the frequency spectrum and value of data at each point in the power line communication device of the fourth embodiment shown in FIG.
- (a) shows the frequency spectrum of the multicarrier data output from the serial-to-parallel conversion circuit (SZP) 23 and input to the BPF 33 and S ZN measurement circuit 31.
- (b) shows the BPF 3 3 is the output frequency spectrum,
- (c) is the output frequency spectrum of the QAM demodulator 34, and
- (d) is the output frequency spectrum.
- the S / N measurement circuit 31 measures the SZN for each of a plurality of subcarriers and outputs it to the carrier selection circuit 32.
- the carrier selection circuit 32 inputs the S / N of each carrier and outputs a selection signal for selecting the subcarrier having the highest SZN to the BPF 33.
- the QAM demodulator 34 demodulates only the subcarrier with the highest SZN # 3 selected by the BPF 33, and demodulates the QAM decoder 25.
- FIG. 7 (d) shows the signal point arrangement of the # 3 subcarrier shown in FIG. 7 (c), for example, in 4-phase QAM.
- the QAM demodulator 34 performs QAM decoding on the QAM demodulated subcarrier data having the highest S / N of # 3 and outputs, for example, “0” as shown in FIG. 7 (e). Decode to the symbol number of ".
- the data combiner 26 combines the symbol numbers as shown in FIG. 7 (e) decoded and decoded by QAM, and outputs, for example, “00” as shown in FIG. 7 (f). Is obtained.
- the subcarrier in the frequency band with the highest SZN is selected and decoded from among a plurality of carriers constituting the multicarrier.
- data reception that is resistant to power line noise can be realized by an inexpensive configuration.
- the QAM demodulator 34 has been described.
- the FFT described in each of the above embodiments may be used instead of the QAM demodulator 34.
- FIG. 8 is a partial configuration diagram of Embodiment 5 of the multicarrier communication apparatus according to the present invention.
- a serial-to-parallel conversion circuit is used in a receiving system according to the present invention. (S / P) Only the configuration after 23 is shown. Therefore, Embodiment 5 can be combined with any of the transmission systems of Embodiments 1 to 3 as in Embodiment 4 above. For example, in FIG.
- 24 is an FFT
- 25 is a QAM decoder
- 26 is a data synthesizer
- 31 is an S / N measurement circuit
- 35 is a selector as a carrier selection means.
- a single-pass filter (LPF) 24 a to 24 d between a Fourier transform circuit (FFT) 24 and a selector 35 is provided. Is omitted.
- FIGS. 9 (a) to 9 (f) show the frequency spectrum and values of data at each point in the power line communication apparatus of the fifth embodiment shown in FIG.
- (a) shows the frequency spectrum of the multi-carrier data output from the serial-parallel conversion circuit (SZP) 23 and input to the Fourier transform circuit (F FT) 24, and (b) shows the Fourier transform circuit (F FT) 24 output frequency spectrum
- (c) is output frequency spectrum of selector 35
- (d) is signal point arrangement of selector 35 output signal
- (e) is QAM decoder 25 Q AM decoded symbol number
- (f) is data And received data after data synthesis by the synthesizer 26.
- the number of subcarriers is four as in the above embodiments.
- the S / N measuring circuit 31 measures the SZN of the frequency axis data of each of the Fourier-transformed subcarriers, and outputs the measured value to the selector 35.
- the selector 35 inputs the S / N of the Fourier-transformed frequency axis data of each subcarrier from the SZN measurement circuit 31 and, based on the SZN, as shown in FIG. One of the highest subcarriers is selected and output to the QAM decoder 25. Note that in FIG. 9 (c), as in the case of Embodiment 4 shown in FIG. 7, the subcarrier # 3 is selected as the highest subcarrier of SZN.
- FIG. 9 (d) shows the signal point arrangement of the # 3 subcarrier shown in FIG. 9 (c) in 4-phase QAM.
- the data synthesizer 26 synthesizes the symbol numbers as shown in FIG. 9 (e) decoded and decoded by QAM decoding, and obtains, for example, “0 0” as shown in FIG. 9 (f). Obtaining received data- Therefore, according to the receiving system of the power line communication device of the fifth embodiment, the Fourier transform is performed for each of a plurality of subcarriers constituting a multicarrier, and after the Fourier transform, the SZN Since one subcarrier of a high frequency band is selected and decoded, the multicarrier data in which the same data is encoded in each subcarrier is received as in the case of the fourth embodiment. In this case, data reception that is resistant to power line noise can be realized with a low-cost configuration.
- FIG. 10 is a partial configuration diagram of Embodiment 6 of the multicarrier communication apparatus according to the present invention, and shows only the configuration after serial-to-parallel conversion circuit (S / P) 23 in the receiving system according to the present invention. I have. Therefore, Embodiment 6 can be combined with the transmission systems of Embodiments 1 to 3 described above.
- a Fourier transform circuit (F FT) 24 and a low-pass filter / letter (LPF) 24 a to The configuration of a part to be inserted in place of the 24d, QAM decoder 25 and data combiner 26 is shown. Note that the same components as those in the above embodiments are denoted by the same reference numerals and described.
- Fig. 10 25 is a QAM decoder, 26 is a data combiner, 31 is an S / N measurement circuit, 34 is a QAM demodulator, and 36 to 39 are bandpass filters as subcarrier extraction means. (BPF), 40 is a gain setting circuit,
- FIGS. 11 (a) to 11 (h) respectively show the frequency spectrum ⁇ value of data at each point in the power line communication device of the sixth embodiment shown in FIG. 10 and the like.
- (a) is the frequency spectrum of the multicarrier data output from the serial-to-parallel conversion circuit (SZP) 23 and input to BPFs 36 to 39, and (b) is the BPF 36 to 3 9 Output frequency spectrum, ( c ) is frequency conversion 'output frequency spectrum of phase and gain adjustment circuit 41, (d) is adder circuit 42, output frequency spectrum of 22, and (e) is QAM demodulator 3. 4, (f) shows the signal point arrangement of the output signal of QAM demodulator 34, (g) shows the symbol number of the QAM decoder, and (h) shows the received data after data synthesis. ing.
- a plurality of (in this embodiment 6, four as in the above embodiments) sub-carriers of multimedia data are converted into serial-parallel data.
- the signals are output from the circuit (SZP) 23 and input to the four BPFs 36 to 39 provided for each subcarrier.
- BPFs 36 to 39 pass only the corresponding subcarriers of the multicarrier data to obtain an output frequency spectrum as shown in FIG. 11 (b).
- BPF 36 passes only the subcarrier # 1 of the multicarrier data # 1 to # 4
- BPF 37 passes only the subcarrier # 2 of the multicarrier data # 1 to # 4.
- BPF 38 is # 'among the # 1 to # 4 multicast data.
- the passing frequency is set so that only the subcarrier # 3 passes and the BPF 39 passes only the subcarrier # 4 of the multicarrier data # 1 to # 4:
- the SZN measurement circuit 31 measures the S / N for each subcarrier output from each of the BPFs 36 to 39 and outputs it to the gain setting circuit 40. Based on the SZN of each subcarrier measured by the measurement circuit 31, the gain is set for each subcarrier and output to the frequency conversion 'phase * gain adjustment circuit 41:
- each subcarrier having a different frequency is converted to the same frequency (refer to fc in Fig. 11 (c)), and the phase of each subcarrier is made the same.
- the gain is adjusted for each subcarrier based on the gain setting for each subcarrier from the gain setting circuit 40, and the frequency spectrum as shown in FIG. 11 (c) is adjusted.
- the vector data is output to the adder circuit 42.
- the gain was increased because SZN was the best, and the gain of # 1 was increased.
- the gain was increased next because the S ZN was the next best, and in the case of subcarrier data of # 4, the gain was increased the third because the SNON was the third best. In the case of # 2 subcarrier data, S ZN was the worst, so adjust the gain to be the lowest.
- the QAM demodulator 34 adds the data of the subcarriers # 1 to # 4 by the adder circuit 42 to FIG. 11 (d).
- the added data as shown is QAM demodulated, and the data after the QAM demodulation as shown in FIG. 11 (e) is output to the QAM decoder 25.
- FIG. 11 (f) shows the addition data shown in FIG. 11 (e) in a signal point arrangement.
- the QAM demodulated addition data from the QAM demodulator 34 as shown in FIG. 11 (f) is QAM-decoded, and as shown in FIG. 11 (g).
- the data combiner 26 combines the symbol numbers as shown in FIG. 11 (g) decoded by QAM decoding, and For example, the received data of "00" is obtained as shown in).
- the SZN corresponding to the frequency conversion, phase adjustment, and SZN of the extracted subcarrier data is high for each of a plurality of subcarriers constituting the multicarrier.
- the gain is adjusted so that the gain of the subcarrier becomes higher for each subcarrier, and addition and decoding are performed. Therefore, a subcarrier with an improved SZN is decoded as compared with the case where each subcarrier is used alone. , 5 and Similarly, when receiving multi-carrier data in which the same data is encoded in each of the sub-carriers, it is possible to receive data that is resistant to power line noise by a correspondingly low-cost configuration:
- the QAM demodulator 34 has been described.
- an FFT may be used instead of the QAM demodulator 34.
- the SZN measurement circuit 31 measures the SZN of each carrier, and based on the S / N, the gain setting circuit 4 It has been described that the gain is set for each carrier by 0, the frequency conversion / phase / gain adjustment circuit 41 adjusts the gain, and the addition circuit 42 adds.However, the present invention is not limited to this.
- the SN measurement circuit 31, the gain setting circuit 40 and the frequency conversion-phase / gain adjustment circuit 41 eliminate the need for gain adjustment, and do not adjust the gain for each carrier based on the S / N of each carrier. Each carrier may be added.
- the SZN of the added subcarrier is naturally lower than the S / N of the added subcarrier after adjusting the gain of each carrier according to the S / N as described above.
- noise when irregular and added, it is usually plus or minus, and if the POWER level does not increase, that is, it often decreases, so the S / N power of the sub-carrier calculated before adding The subcarrier S
- the frequency conversion / phase / gain adjustment circuit 41 performs only the frequency conversion and the phase adjustment.
- FIG. 12 is a partial configuration diagram of Embodiment 7 of the multicarrier communication apparatus according to the present invention.
- a serial-to-parallel conversion circuit S / P Only the configuration after 23 is shown.
- Embodiment 7 can be combined with the transmission systems of Embodiments 1 to 3 as in Embodiments 4 to 6 above.
- FFT frequency transform
- LPF low-pass filter
- QAM decoder 25 QAM decoder 25
- data combiner 26 instead of insertion part are shown.
- the same components as those in the above embodiments will be described with the same reference numerals.
- FIGS. 13 (a) to 13 (g) show the frequency spectrum values and the like of data at each point in the power line communication apparatus of the seventh embodiment shown in FIG. 12 respectively. .
- ( a ) shows the frequency spectrum of the multi-carrier data output from the serial-to-parallel converter (S / P) 23 and input to the Fourier converter (FFT) 24, and (b) shows the Fourier Conversion circuit (FFT) 24 output frequency spectrum, (c) output frequency spectrum of phase / gain adjustment circuit 43, (d) output frequency spectrum of adder circuit 41, (e) QAM The signal point arrangement of the output signal of the demodulator 34, (f) shows the symbol number subjected to the QAM decoder, and (g) shows the received data after data synthesis.
- the multicarrier data is output from the serial-to-parallel conversion circuit (S / P) 23 until it is input to the BPF 33 and the SZN measurement circuit 31. Since they are the same, only the subsequent operation will be described.
- a plurality of subcarriers (in the seventh embodiment, four as in the above embodiments) are used. It is output from the conversion circuit (SZP) 23 (see Fig. 1) and input to the Fourier transform circuit (FFT) 24.
- the Fourier transform circuit (FFT) 24 performs a Fourier transform on the multicarrier data composed of four subcarriers, and converts the data into data on the frequency axis having the same frequency band as shown in Fig. 13 (b). , SZN measurement circuit 31 and phase / gain adjustment circuit 43.
- the S / N measurement circuit 31 measures the SZN for each of a plurality of Fourier-transformed subcarriers on the frequency axis and outputs the result to the gain setting circuit 40, as in the fifth embodiment. .
- the gain setting circuit 40 sets the gain based on the measured SZN of each subcarrier so that the higher the SZN, the higher the gain, and outputs the gain to the phase / gain adjustment circuit 43.
- the phase / gain adjustment circuit 43 adjusts the phase of each subcarrier of the frequency axis data having the same frequency band from the FFT 24 so that the phase becomes the same, and the gain setting for each subcarrier from the setting circuit 40 is performed. The gain is adjusted based on this, and the data of the frequency spectrum as shown in FIG. 13 (c) is output to the addition circuit 42.
- the adder circuit 42 the data of the subcarriers after the Fourier transform of # 1 to # 4 of the frequency spectrum as shown in FIG. 13 (c) from the phase gain control circuit 43 are obtained.
- the data is added to obtain frequency spectrum data as shown in FIG. 13 (d) and output to the QAM decoder 25.
- FIG. 13 (e) shows the addition data shown in FIG. 13 (d) in a signal point arrangement.
- the QAM decoder 25 QAM-decodes the addition data from the addition circuit 42 as shown in FIG.
- the data combiner 26 combines the symbol numbers as shown in FIG. 13 (f) decoded and decoded by the data combiner 26 to obtain FIG. 13 (f). For example, get the received data of "00" as shown in g).
- the multicarrier composed of a plurality of subcarriers is Fourier-transformed into frequency component data by the FFT 24, the phase is adjusted, and the gain is adjusted according to the SZN. Since addition and decoding are performed, a subcarrier with an improved S / N compared to the case of using each subcarrier alone is decoded.As in the case of Embodiments 4 to 6, each subcarrier is decoded.
- each subcarrier is decoded.
- the subkey with improved SZN is used.
- the SZN of each carrier is measured by the S / N measurement circuit 31 and the gain is set for each carrier by the gain setting circuit 40 based on the SZN. 3 has been described as adjusting the gain, and the adder circuit 42 has been described as adding.
- the present invention is not limited to this.
- phase-gain adjustment circuit 43 performs only the phase adjustment c
- FIG. 14 is a partial configuration diagram of Embodiment 8 of the multicarrier communication apparatus according to the present invention.
- a serial-to-parallel conversion circuit (SZP) 23 Only the following configuration is shown. Therefore, Embodiment 8 can be combined with the transmission systems of Embodiments 1 to 3 as in Embodiments 4 to 7 above.
- the Fourier transform circuit (F 3 shows a configuration of a part inserted instead of the FT) 24, the single pass filter (LPF) 24a to 24d, the QAM decoder 25, and the data synthesizer 26.
- LPF single pass filter
- 24 is a Fourier transform circuit (FFT)
- 26 is a data synthesizer
- 44 is a QAM decoder
- 45 is a decision unit.
- Embodiment 8 unlike the receiving system of Embodiment 1 shown in FIG. 1, a corpus filter (L L) between a Fourier transform circuit (F FT) 24 and QAM data 43
- FIGS. 15 (a) to 15 (f) show the frequency spectrum values and the like of data at each time point in the power line communication apparatus ⁇ of the eighth embodiment shown in FIG. 14, respectively:
- (a) shows the frequency spectrum of the multi-carrier data output from the serial-to-parallel conversion circuit (SZP) 23 and input to the Fourier conversion circuit (FFT) 24, and (b) shows the frequency spectrum.
- Symbol numbers output from 45 and (f) indicate received data after data synthesis.
- the number of subcarriers is four, as in the above embodiments. It is output from (SZP) 23 (see Fig. 1) and input to the Fourier transform circuit (FFT) 24.
- the Fourier transform circuit (FFT) 24 performs a Fourier transform on the multicarrier data consisting of four subcarriers, and the frequency band of each subcarrier is the same as shown in Fig. 15 (b)
- the data is converted to frequency axis data and output to the QAM decoder 44.
- FIG. 15 (c) shows the signal point arrangement of the Fourier-transformed data shown in FIG. 15 (b).
- the QAM decoder 44 performs QAM decoding on the data after Fourier transform for each subcarrier from the FFT 24 as shown in FIG.
- decoding is performed for each subcarrier into a symbol number, Output to the detector 45.
- Fig. 15 (d) in the case of # 1 subcarrier data, for example, it is decoded to symbol number "0".
- # 2 subcarrier data for example, the symbol number If it is decoded to "1" and the data of the subcarrier # 3 is decoded to the symbol number "0", for example, to the data of the subcarrier # 4 it is decoded to the symbol number "0" This indicates that decryption has been performed.
- the decision unit 45 inputs the symbol number of each subcarrier from the QAM decoder 44 as shown in FIG. 15 (d), and outputs the symbol number to be output by majority vote as shown in FIG. 15 (e). Is selected, that is, the symbol number with the highest output among the subcarriers is selected and output to the data synthesizer 26. In the case shown in FIG. 15 (e), as shown in FIG. 15 (d), the decoded data having the symbol number "0" is the largest, so that the decoded data having the symbol number "0" is selected.
- the data synthesizer 26 synthesizes the decoded data after QAM decoding selected by the majority decision in the decision unit 45 in the same manner as in the above-described embodiment, for example, as shown in FIG. 15 (f).
- the received data of "00" is obtained.
- the multicarrier composed of a plurality of subcarriers is Fourier-transformed into frequency component data for each carrier by the FFT 24, and thereafter, the frequency of each carrier for each subcarrier is determined.
- the component data is QAM decoded, and the symbol number is selected by majority decision from the symbol numbers of the QAM-decoded carriers, so that the carrier data is concentrated in the carrier's frequency band with noise from the power line. Even if the carrier data becomes garbled, the majority decision will select the most likely other carrier data, and data reception that is more resistant to power line noise can be realized with an inexpensive configuration.
- the present invention since data communication is performed using the multi-carrier modulation method, low-cost and transmission-rate transmission suitable for networks such as small offices and homes is performed. A high-speed communication environment can be provided, and the frequency band of the entire multicarrier has been expanded by a predetermined multiple of the output from the inverse Fourier transform means by upsampling means, etc. Therefore, even if it concentrates on data, data transmission and reception that is resistant to noise can be realized with a low-cost configuration.
- the frequency interval of the transmitted / received multicarrier data is set to a predetermined frequency interval of the multicarrier data output from the inverse Fourier transform means. Even if it is specified as a multiple, it is only necessary to add a cut-off means for cutting off the frequency band of each carrier to a predetermined multiple of the multiple, and an up-sampling means for up-sampling at a predetermined multiple of each carrier.
- the number of inputs / outputs of the carrier encoding means and the inverse Fourier transform means or the Fourier transform means is reduced, so that a small-scale and inexpensive means can be used, and the cost can be greatly reduced.
- the communication between the two multi-carrier communication apparatuses can be performed. If the multi-carrier communication apparatus of the present invention determines in advance which multi-carrier to encode data, data communication with the high-speed multi-carrier communication apparatus becomes possible without any improvement.
- the channels of the data to be encoded at each time are different for each of the four multicarriers from low frequency to high frequency according to the PN sequence, so that a certain carrier is crushed by noise. Even if Since data can be transmitted and received by other carriers, even if different data is encoded for each carrier, all data will not be destroyed, noise resistance to power line noise will be improved, and more reliable Enables data communication:
- the transmission system encodes the same data in any of the multicarriers, while the reception system encodes the same data in each of the subcarriers constituting the multicarrier. , And decodes multi-carrier data in an arbitrary frequency band that is less affected by noise, so even if noise from the power line is concentrated in a certain frequency band, data transmission and reception is as much resistant to power line noise. Becomes possible.
- the multicarrier data in which the same data is encoded in all the subcarriers of the multicarrier with the widened frequency band is received, and the frequency having the highest SZN is received. Since the subcarrier data of the band is selected and decoded, data reception that is resistant to noise can be realized with a low-cost configuration.
- the multicarrier data in which the same data is encoded in all the subcarriers of the multicarrier with the widened frequency band is received and Fourier-transformed, and the SZN Since subcarrier data in a high frequency band is selected and decoded, data can be received with high noise and a low-cost configuration is possible.
- the multicarrier data in which the same data is encoded in all the subcarriers of the multicarrier with the widened frequency band is received and Fourier-transformed.
- QAM decoding is performed for each subcarrier, and the most probable symbol number is selected by majority decision from among the symbol numbers decoded for each subcarrier. It becomes possible with an inexpensive configuration.
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Description
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Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
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JP2000571594A JP3286918B2 (ja) | 1998-09-21 | 1999-09-21 | マルチキャリア通信装置およびマルチキャリア通信方法 |
EP19990943432 EP1045538A1 (en) | 1998-09-21 | 1999-09-21 | Multicarrier communication device and multicarrier communication method |
CA 2311376 CA2311376A1 (en) | 1998-09-21 | 1999-09-21 | Multi-carrier communication system and multi-carrier communication method |
IL13624399A IL136243A0 (en) | 1998-09-21 | 1999-09-21 | Multicarrier communication device and multicarrier communication method |
AU56539/99A AU5653999A (en) | 1998-09-21 | 1999-09-21 | Multicarrier communication device and multicarrier communication method |
KR1020007005563A KR20010032342A (ko) | 1998-09-21 | 1999-09-21 | 멀티 캐리어 통신 장치 및 멀티 캐리어 통신 방법 |
NO20002597A NO20002597L (no) | 1998-09-21 | 2000-05-19 | Anordning og fremgangsmÕte for kommunikasjon med flere bærebølger |
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JP (1) | JP3286918B2 (ja) |
KR (1) | KR20010032342A (ja) |
CN (1) | CN1288578A (ja) |
AU (1) | AU5653999A (ja) |
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JP2002374190A (ja) * | 2001-06-15 | 2002-12-26 | Matsushita Electric Ind Co Ltd | 電力線通信装置および電力線通信システム |
JP2003218750A (ja) * | 2002-01-23 | 2003-07-31 | Lg Electronics Inc | 電力線通信装置 |
JP2006525711A (ja) * | 2003-04-30 | 2006-11-09 | スピドコム テクノロジーズ | 搬送電流によるデータ伝送方法 |
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KR20020007441A (ko) * | 2000-07-13 | 2002-01-29 | 이기원 | 다중 반송파 변조방식을 이용한 전력선 통신 시스템 |
JP3396815B2 (ja) * | 2001-06-20 | 2003-04-14 | 富士通株式会社 | データ伝送方法及びデータ伝送装置 |
EP1468503B1 (en) | 2002-01-24 | 2015-08-26 | Panasonic Corporation | Method of and system for power line carrier communications |
KR100443948B1 (ko) * | 2002-02-19 | 2004-08-11 | 주식회사 플레넷 | 주파수 확산 전력선 통신에서 특정 주파수 페이딩에효과적인 상관 시스템 및 그 방법 |
CN1988402B (zh) * | 2006-10-10 | 2011-04-20 | 东南大学 | 电力线载波通信系统的实现方法 |
CN104700838B (zh) * | 2013-12-09 | 2019-08-27 | 国民技术股份有限公司 | 一种多载波音频通信的处理方法、系统及音频接收端设备 |
CN106464614A (zh) * | 2014-06-20 | 2017-02-22 | 易卡诺通讯公司 | 用于dmt系统中的高速数据传输的双频带模拟前端 |
CN111835600B (zh) * | 2019-04-16 | 2022-09-06 | 达发科技(苏州)有限公司 | 多模式超高速数字用户线路收发器设备及其执行方法 |
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- 1999-09-21 CN CN99802304A patent/CN1288578A/zh active Pending
- 1999-09-21 CA CA 2311376 patent/CA2311376A1/en not_active Abandoned
- 1999-09-21 WO PCT/JP1999/005129 patent/WO2000018048A1/ja not_active Application Discontinuation
- 1999-09-21 IL IL13624399A patent/IL136243A0/xx unknown
- 1999-09-21 JP JP2000571594A patent/JP3286918B2/ja not_active Expired - Fee Related
- 1999-09-21 EP EP19990943432 patent/EP1045538A1/en not_active Withdrawn
- 1999-09-21 AU AU56539/99A patent/AU5653999A/en not_active Abandoned
- 1999-09-21 KR KR1020007005563A patent/KR20010032342A/ko active IP Right Grant
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JP2002374190A (ja) * | 2001-06-15 | 2002-12-26 | Matsushita Electric Ind Co Ltd | 電力線通信装置および電力線通信システム |
JP2003218750A (ja) * | 2002-01-23 | 2003-07-31 | Lg Electronics Inc | 電力線通信装置 |
JP2006525711A (ja) * | 2003-04-30 | 2006-11-09 | スピドコム テクノロジーズ | 搬送電流によるデータ伝送方法 |
Also Published As
Publication number | Publication date |
---|---|
AU5653999A (en) | 2000-04-10 |
EP1045538A1 (en) | 2000-10-18 |
NO20002597L (no) | 2000-07-21 |
CN1288578A (zh) | 2001-03-21 |
IL136243A0 (en) | 2001-05-20 |
CA2311376A1 (en) | 2000-03-30 |
JP3286918B2 (ja) | 2002-05-27 |
KR20010032342A (ko) | 2001-04-16 |
NO20002597D0 (no) | 2000-05-19 |
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