CN100574132C - Device for power line carrier communications - Google Patents

Abstract

The invention provides a kind of device for power line carrier communications, comprise: transmitting element, it has signaling point mapping device, be used to shine upon from sending a plurality of bit streams that data produce, wavelet inverse transformation device is used for modulating corresponding subcarrier by orthogonal wavelet waveform, so that generation time waveform series data, D/A converter is used for described time waveform series data is converted to simulated time waveform series of signals; Receiving element, it has A/D converter, be used for obtaining the serial Wave data of sampling from electric-power wire communication signal, the wavelet transform device, the signaling point data that to be used for the serial Wave data wavelet transform of described sampling be corresponding subcarrier, code element is judged device, is used for judging bit stream by the mapping of described signaling point mapping device by a plurality of signaling point data of inverse mapping, and is used for the synthetic each other bit stream of being judged and is used as receiving DS.

Description

Device for power line carrier communications

Technical field

The present invention relates to a kind of device for power line carrier communications, be used to use power line to carry out transfer of data.

Background technology

Device for power line carrier communications has a principal character to make and can set up domestic communication network immediately by utilizing the power line that has been installed in each family to be used as the Network Transmission path.But,, therefore leak out high electrical power from these power lines because these device for power line carrier communications send/received signal as communication medium by the power line that uses such degree of balance with variation.And in the needed frequency band of high-speed power line carrier communication, amateur radio communication and shortwave broadcasting program are utilizing these frequency bands.As a result, the problem that has the interference that these device for power line carrier communications cause for these existing communication systems.For aspect radio law of in each country, working out and radio communication law predetermined restricted, various types of legal limits have been provided for project such as spendable frequency band (scope) and admissible electric field strength.Therefore, according to these laws, for some restriction of frequency band inevitable requirement that is used for power line carrier communication.And, because various electrical equipment are connected to the universal electric power line of the communication medium that constitutes device for power line carrier communications, therefore depend on the wiring condition of each homeplug powerline and exist in many difference in the impedance of power line, at noise that occurs on the power line and the signal attenuation between the signal transmission period, they may have very big influence for communication performance.And these impedances, noise and signal attenuation are changed according to the electrical equipment that is connected to these power lines, and its characteristic is different widely according to frequency.

As mentioned above, the risk below in such power line carrier communication of electrification line, it is contemplated that as communication medium.That is, can cause communication failure and interference owing to the signal attenuation of impedance change, noise and power line for other existing communication systems.As a result, can avoid using the system of frequency band clearly to distinguish mutually with the system that adapts to each national legal provisions neatly with communication failure.In other words, operable frequency band must be distinguished mutually with the frequency band in communication not in communication.And these systems change and should easily and inevitably can obtain.About this problem, a large amount of technical thought of multicarrier transfer system have been proposed to use traditionally.

Be used as traditional device for power line carrier communications of communication media as electrification line wherein, for example exist in disclosed such device for power line carrier communications in Japanese Laid-Open Patent Application 2000-165304 number.

Figure 25 has the block diagram of indication at the device for power line carrier communications described in Japanese Laid-Open Patent Application 2000-165304 number.

In Figure 25, Reference numeral 600 shows device for power line carrier communications, Reference numeral 601 designation datas are divided device, Reference numeral 602 expression QAM (quadrature amplitude modulation) encoders, Reference numeral 603 expression inverse Fourier transform devices, Reference numeral 604 is parallel-to-serial transducers, and Reference numeral 605 shows D/A converter.And, Reference numeral 606 expression low pass filters, Reference numeral 607 expression power line coupling circuits, Reference numeral 608 expression power lines, Reference numeral 609 is another low pass filters, Reference numeral 610 indication A/D converters.And Reference numeral 611 shows serial-to-parallel transducer, Reference numeral 612 expression Fourier transform devices, and Reference numeral 613 shows the QAM decoder, Reference numeral 614 designation data synthesizers.

Can clearly be seen that from the device layout of Figure 25, in the device for power line carrier communications described in Japanese Laid-Open Patent Application 2000-165304 number, use the OFDM transmission system (following will be called as " OFDM " system) of Fourier transform to be applied to power line carrier communication.

Then, will the operation of the device for power line carrier communications of Figure 25 be described.

About the transmission operation to power line 608, the transmission data at first enter data divider 601 so that produce the bit stream that is used to be assigned to a plurality of subcarriers.Then, this bit stream is converted to composite signal by QAM encoder 602, then, produces by the time sampling series of frequency division multiplexing by handling described composite signal via inverse Fourier transform device 603 and parallel-to-serial transducer 604.This time sampling series is sent to power line 608 via D/A converter 605, low pass filter 606 and power line coupling circuit 607.On the contrary, from the reception operation of power line 608, A/D converter 610 is converted to digital signal with analog signal (electric-power wire communication signal), and this analog signal is received from power line 608 via power line coupling circuit 607 and low pass filter 609 simultaneously.Then, this digital signal is converted into QAM code with respect to each frequency via serial-to-parallel transducer 611 and Fourier transform device 612.Then, each QAM code is by 613 demodulation of QAM decoder, and these demodulated data are synthetic each other by memory 14.

As mentioned above, according to this device for power line carrier communications, transmission signals is configured to comprise the subcarrier with a plurality of frequency spectrums by the OFDM transmission system, and the amount of information that is superimposed on these corresponding subcarriers changes adaptedly according to the frequecy characteristic of the noise of power line and attenuation.As a result, there is such advantage: when utilizing described frequency, can carry out data communication by improving transmission speed with higher efficient.And, because the circuit that provides at transmitting terminal is come Be Controlled in the mode of not using any subcarrier, therefore can avoiding therein, the environment of transmission path is such data communication of worst frequency band, and, therefore can under stable condition, carry out data communication because the condition of transmission path is carried out many-valued modulation in the frequency band preferably energetically therein.And under this control operation, this device for power line carrier communications can be exported the signal that correctly is fitted to for each effective rules of country.

But in above-mentioned conventional powerline carrier communication apparatus, following problem takes place, and referring now to Figure 26 and Figure 27 described problem is described.Figure 26 is used for illustrating graphically protection system at interval, and Figure 27 is another figure that is used for indicating graphically the filtered band characteristic of OFDM transmission system.

In this traditional device for power line carrier communications, in the data communication of electrification line, carry out the OFDM transmission operation of using Fourier transform.In this OFDM transmission operation of using Fourier transform, must in signal section, provide such protection compartment shown in Figure 26, so that alleviate the adverse effect of multipath aspect.Consider the message transmission operation, this protection compartment becomes redundant, has therefore reduced frequency utilization efficient.Protection is short more at interval, and then efficiency of transmission is enhanced manyly more.But the adverse effect of multipath aspect is provided to receiver side easily, so the error rate characteristic degradation.Under the power line communication environment,, therefore must improve the protection compartment because especially increase the time of delay of the delay ripple that causes by the multipath aspect.As a result, the ratio of sacrifice transmission speed becomes very big.For fear of the interference for existing system, as legacy system, such system is configured.That is, because be not assigned with (conductively-closed) for the number of sub certificate, therefore the amplitude of the signal in the frequency band that uses in existing system is lowered to zero in theory.Figure 19 shows an example of shielding (aftermentioned) obsolete frequency band in the OFDM transmission system.In fact, the amplitude of the subcarrier of conductively-closed does not occur.But,, only therefore can obtain the approximately decay of 13dB because the secondary lobe of adjacent subcarrier (side lobe) is revealed.Under the situation of OFDM transmission system,, as shown in figure 27, therefore only can obtain about 13dB's with respect to the decay of main lobe for secondary lobe because by using square wave to carry out Fourier transform as window function.As a result, the interference for the existing communication system can not be reduced fully.More specifically, at the frequency band that is used for the high-speed power line carrier communication, provide a large amount of radio systems, such as ham radio system and shortwave broadcasting system with higher reception susceptibility.For fear of detrimental effect, there is such necessity: do not send any signal for the frequency band that uses by existing system to these existing systems.For this reason, the frequency band block filter must newly be installed in conventional method.This frequency band block filter may cause the increase of circuit size.And because the necessary high speed operation of described frequency band block filter, therefore this high speed operation requires to cause one of principal element that improves power consumption.

Summary of the invention

In this traditional device for power line carrier communications, the aspect below needing.That is,, can carry out data communication even make the protection of factor of transmission speed variation at interval the time when having eliminated to constitute.When the radio law of the frequency band that in communication, uses and corresponding country/when regulation is limited accordingly, the enough big attenuation of acquisition in the frequency band that can under the situation that the frequency band block filter that causes the factor that improves circuit size is not installed, in the existing communication system, use.

In order to satisfy such requirement, the purpose of this invention is to provide a kind of device for power line carrier communications, it can be worked as follows: promptly, even make the protection of factor of transmission speed deterioration at interval the time when having eliminated to constitute, also can carry out data communication.When the radio law of the frequency band that in data communication, uses and corresponding country/when regulation is limited accordingly, the enough big attenuation of acquisition in the frequency band that can under the situation of the frequency band block filter that the factor that causes that circuit size increases is not installed, in the existing communication system, use.

In order to address the above problem, be characterised in that such device for power line carrier communications according to a kind of device for power line carrier communications of one aspect of the present invention, it comprises: transmitting element; Receiving element; The power line coupling unit is used for being used as electric-power wire communication signal with respect to the signal that the power line stack obtains from transmission unit, and also is used for only extracting electric-power wire communication signal from power line; Control unit, be used to control the structural detail separately of described transmitting element and receiving element, thus by using a plurality of subcarriers to come the executive communication operation, wherein transmitting element comprises: signaling point mapping device is used for producing a plurality of bit streams so that described bit stream is mapped to the signaling point of corresponding subcarrier from the transmission data of input; Wavelet inverse transformation device is used for basis and modulates corresponding subcarrier by the signaling point data of each subcarrier of signaling point mapping device mapping by orthogonal wavelet waveform, so that generation time waveform series data; D/A converter, the time waveform series data that is used for being produced by wavelet inverse transformation device is converted to simulated time waveform series of signals; Wherein receiving element comprises: A/D converter is used for digitally changing the electric-power wire communication signal that extracts from power line by the power line coupling circuit to obtain the serial Wave data of sampling; The wavelet transform device, the sampling series Wave data wavelet transform that is used for obtaining by A/D converter is the signaling point data of corresponding subcarrier; Code element is judged device, is used for judging bit stream by the mapping of described signaling point mapping device by inverse mapping from a plurality of signaling point data of described wavelet transform device output, and is used for the synthetic each other bit stream of being judged and is used as receiving DS.

As a result, can obtain such device for power line carrier communications.That is, even make the protection of transmission speed deterioration also can carry out data communication at interval the time when having eliminated to constitute.Though the frequency band that uses is limited accordingly with the radio law of corresponding country, also obtain enough big attenuation in the frequency band that can under the situation of the frequency band block filter that the increase factor that causes circuit size is not installed, in the existing communication system, use in data communication.

Description of drawings

Figure 1A shows the figure of the notion of the time waveform that is used to illustrate wavelet, and Figure 1B indication is used to illustrate the figure about the notion of the frequency spectrum of wavelet;

Fig. 2 A is the key diagram that is used for illustrating in the data flow of orthogonal transform operation, and Fig. 2 B is the key diagram that is used for illustrating in the data flow of overlapping orthogonal transform operation;

Fig. 3 is the block diagram that is used to represent according to the device for power line carrier communications of embodiments of the invention pattern 1;

Fig. 4 is the key diagram of operation that is used to illustrate the transmitting element of device for power line carrier communications shown in Figure 3;

Fig. 5 is the key diagram of operation that is used to illustrate the receiving element of device for power line carrier communications shown in Figure 3;

Fig. 6 is the block diagram that is used to indicate according to the device for power line carrier communications of embodiments of the invention pattern 2;

Fig. 7 is the block diagram that is used to represent according to the device for power line carrier communications of embodiments of the invention mode 3;

Fig. 8 is the key diagram of operation that is used to illustrate the transmitting element of device for power line carrier communications shown in Figure 7;

Fig. 9 is the key diagram of operation that is used to illustrate the receiving element of device for power line carrier communications shown in Figure 7;

Figure 10 A is the figure of example that is used for being illustrated in graphically the impulse response of each filter that the bank of filters circuit of the complete reconstructions in 4 fens that are used to realize GLT uses, and Figure 10 B is the figure of example that is used for being illustrated in graphically the frequency response of the respective filter that the bank of filters circuit of the complete reconstructions in 4 fens that are used to realize GLT uses;

Figure 11 A is the figure of example that is used for being illustrated in graphically the impulse response of the respective filter that the bank of filters circuit that is used to realize 4 fens ELT uses, and Figure 11 B is the figure of example that is used for being illustrated in graphically the frequency response of the respective filter that the bank of filters circuit that is used to realize 4 fens ELT uses;

Figure 12 A is the block diagram that is used to indicate the band synthesis filter group circuit that is made of general FIR filter, and Figure 12 B is the block diagram that is used to illustrate the frequency band division bank of filters circuit that is made of general FIR filter;

Figure 13 A is the block diagram that is used to indicate the band synthesis filter group circuit that is made of multiphase filter, and Figure 13 B is the block diagram that is used to illustrate the frequency band division bank of filters circuit that is made of multiphase filter;

Figure 14 is the block diagram that is used for the multiphase filter of presentation graphs 13A and 13B;

Figure 15 A is the block diagram that is used to represent as the band synthesis filter group circuit of the wavelet inverse transformation of the device for power line carrier communications shown in Fig. 3, Fig. 6, Fig. 7; Figure 15 B is the block diagram that is used to represent as the frequency band division bank of filters circuit of the wavelet transform of the device for power line carrier communications shown in Fig. 3, Fig. 6, Fig. 7;

Figure 16 is the functional-block diagram that is used to indicate plane rotation counting circuit;

Figure 17 is the key diagram that is used to illustrate according to the control method of the device for power line carrier communications of embodiments of the invention pattern 10;

Figure 18 is the figure that is used for illustrating graphically the example that allows to be used for the power line carrier communication time-frequency spectrum;

Figure 19 is the figure that is used for being illustrated in graphically the transmission spectrum under the situation of using the OFDM transmission;

Figure 20 is the figure that is used for indicating graphically the transmission spectrum of device for power line carrier communications;

Figure 21 is the key diagram that is used to illustrate in the control method of the device for power line carrier communications shown in Fig. 3, Fig. 6, Fig. 7;

Figure 22 be used to illustrate according to the device for power line carrier communications of one embodiment of the present of invention pattern 13 the flow chart of operation of control unit;

Figure 23 A is the key diagram of change of signaling point quantity that is used to illustrate the signaling point mapping device of device for power line carrier communications, and Figure 23 B is the key diagram of change of signaling point quantity that is used to illustrate the signaling point mapping device of device for power line carrier communications;

Figure 24 is the flow chart that is used to illustrate according to the operation of the device for power line carrier communications of embodiments of the invention pattern 14;

Figure 25 is used in reference to the block diagram that is shown in the device for power line carrier communications of describing in Japanese Laid-Open Patent Application 2000-165304 number;

Figure 26 is the figure that is used for indicating graphically protection system at interval;

Figure 27 is the figure that is used for illustrating graphically the bank of filters characteristic of OFDM transmission system;

Figure 28 is the block diagram that is used to indicate according to the power line communication apparatus of embodiments of the invention pattern 1;

Figure 29 is the figure that is used for indicating graphically the frequency spectrum of the WOFDM system that has wherein arranged a plurality of subcarriers;

Figure 30 is the block diagram that is used to represent according to the electric line communication system of embodiments of the invention pattern 2;

Figure 31 A is the block diagram that is used for illustrating as at the spread spectrum power line communication apparatus of the disclosed power line communication apparatus of described publication, and Figure 31 B is the block diagram of alc circuit that is used to indicate the spread spectrum power line communication apparatus of pie graph 31A.

Embodiment

Referring now to Figure 1A-Figure 24,, the embodiments of the invention pattern will be described.

(embodiment pattern 1)

The difference of the modulating/demodulating operation of being carried out by Fourier transform and wavelet transform at first, is described now with reference to Figure 1A, 1B, 2A and 2B.Figure 1A shows the figure of the notion of the time waveform that is used to illustrate wavelet, and Figure 1B indication is used to illustrate the figure about the notion of the frequency spectrum of wavelet.Fig. 2 A is the key diagram that is used for illustrating in the data flow of orthogonal transform operation, and Fig. 2 B is the key diagram that is used for illustrating in the data flow of overlapping orthogonal transform operation.

In the modulating/demodulating operation of using Fourier transform, a plurality of orthogonal trigonometric functions multiply by the window function of square wave to constitute each subcarrier.At this moment, frequency characteristic becomes Sinc function (Sinx/x function).On the other hand, in the modulating/demodulating operation of using wavelet transform, each subcarrier is made of a plurality of orthogonal wavelets.In this case, expression formula " wavelet " is corresponding to such waveform, and it is arranged in even time domain and at frequency domain, shown in Figure 1A and 1B.

And, shown in Fig. 2 A, in Fourier transform, the sampled value of input signal processed to form sampling block in shift step without any overlapping operation.The conversion example of Fig. 2 A has represented to equal in division numbers the flow operations of the piece formation input signal under 2 situations illustratively.On the other hand, in wavelet transform, shown in Fig. 2 B, the sampled value of input signal is processed to use following manner to form sampling block: these sampled values overlap each other by the sampled value of displacement specific quantity in each shift step.The shift step of Fig. 2 B show illustratively division numbers equal 2 and degree of overlapping be selected as the flow operations that piece under 2 the situation forms input signal.Can clearly be seen that from the comparative result between Fourier transform and wavelet transform even when using same division numbers, the filter length in a shift step differs from one another.In other words, the shape of subcarrier waveform and time span are determined uniquely that with respect to the division numbers in Fourier transform the shape and the time span of subcarrier can be changed according to the overlapping degree that is the input signal in the wave conversion (wavelet transform has the degree of freedom) simultaneously.

Fig. 3 is the block diagram that is used to indicate according to the device for power line carrier communications 100 of embodiments of the invention 1.

In Fig. 3, Reference numeral 101 shows transmitting element, Reference numeral 111 indication receiving elements.Transmitting element 101 is provided signaling point mapping device 102, wavelet inverse transformation device 103, D/A converter 104, transmit amplifier 105 and band pass filter 106.And receiving element 111 is equipped with band pass filter 112, amplification controller 113, A/D converter 114, wavelet transform device 115, code element judgement device 116.Device for power line carrier communications 100 has been arranged transmitting element 101, receiving element 111, power line coupling circuit 121 and control unit 122.

The operation of the device for power line carrier communications 100 that uses above-mentioned layout is described referring now to Fig. 4 and Fig. 5.Fig. 4 is the key diagram of operation that is used to illustrate the transmitting element 101 of device for power line carrier communications 100.Fig. 5 is the key diagram of operation that is used to illustrate the receiving element 111 of device for power line carrier communications 100.Should be noted that in the wavelet transform step and exist about the quantity " N " of subcarrier and the degree of freedom of filter length " M ".The quantity of subcarrier " N " equals power 2, and filter length " M " equals to multiply by the value that arbitrary integer obtains by the quantity " N " with subcarrier.But, in this embodiment pattern 1, for the purpose of simplifying the description, be used for service band is divided into 4 wavelet transform.In other words, the following explanation quantity " N " that is based on the subcarrier that is used to communicate by letter is selected as 4 condition.And each filter that constitutes wavelet transform has the filter length of the big twice of quantity " N " than subcarrier, and by using two groups of signaling point data to carry out the wavelet transform operation.

Use Fig. 4 that the data flow of transmitting element 101 is described at first, now.

The data (sending bit series) that signaling point mapping device 102 at first will send by segmentation produce a plurality of bit streams with suitable length.For example, signaling point mapping device 102 is subdivided into data flow " 00 ", " 01 ", " 11 ", " 10 ", " 10 ", " 11 ", " 01 " and " 00 " of 2 bits with such data (sending bit series) " 0001111010110100 ", so that produce the bit stream that is assigned to corresponding subcarrier.Then, signaling point mapping device 102 is mapped to the corresponding bit stream of " 00 ", " 01 " of these generations, " 11 ", " 10 " corresponding to the signaling point such as PAM (pulse amplitude modulation) signaling point of "+1 ", "+3 ", " 3 ", " 1 ".Then, signaling point mapping device 102 distributes these PAM signaling point data to be used as " T1 " to the input unit of wavelet inverse transformation device 103.Wavelet inverse transformation device 103 is carried out wavelet inverse transformation operation by using two groups of PAM signaling point data that are assigned to " T1 ", so that export the sampled value of the transmission waveform on time shaft during a code element.D/A converter 104 is exported this time sampling value (time waveform series data) in the constant sampling time.Transmit amplifier 105 sends waveform with this and is amplified to the transmission signal level, and then, band pass filter 106 is removed unnecessary frequency component from institute's amplified transmission signal.Power line coupling circuit 121 has been used as being used for the signal of power line communication by the signal of band pass filter 106 waveform shapings to power line 110 outputs.Above-mentioned operation is corresponding to the explanation of the data flow operations during transmit operation.

The data flow operations of receiving element 111 then, is described referring now to Fig. 5.

At first, power line coupling circuit 121 extracts electric-power wire communication signal from power line 110.Band pass filter 112 is removed the noise signal that is positioned at outside the service band from the electric-power wire communication signal that is extracted, then to the filtered signal of communication of amplification controller 113 outputs.The signal level of amplification controller 113 these filtered signals of communication of control is so that covered by the dynamic range of A/D converter 114.Then, A/D converter 114 at timing sampling this analog signal waveform identical with the sampling timing of transmitting terminal to obtain digital waveform data.This Wave data of wavelet transform device 115 wavelet transforms is so that obtain the signaling point data at each subcarrier.Code element judges that these signaling point data of device 116 inverse mappings are to revert to most probable bit stream with these signaling point data, so that can obtain to receive data.Above-mentioned operation is the explanation in the data flow operations of reception period.

Should be understood that in this embodiment pattern 1, be assigned to a plurality of subcarriers in regular turn, therefore can realize high-speed data communication because send data.Because identical data are assigned to a plurality of different subcarriers that will send simultaneously, therefore can realize having such data communication of higher reliability.

Because it is used the above-mentioned layout of device for power line carrier communications 100, therefore no longer need be in the OFDM transmitting system required such as protection redundant signals part at interval, so can improve transmitting efficiency.And, because can operate the Fourier transform operation that needing to realize plural number calculating, therefore can reduce total amount of calculation by the such wavelet transform of calculating cause of carrying out real part, and, circuit size can be reduced.

(embodiment pattern 2)

Fig. 6 is the block diagram that is used to indicate according to the device for power line carrier communications of embodiments of the invention pattern 2.In this embodiment pattern 2, such situation is described: the baseband signal in embodiment pattern 1 be expanded for wherein arbitrarily carrier wave be set to the band signal at its center.

In Fig. 6, Reference numeral 101 shows transmitting element, Reference numeral 111 indication receiving elements.Transmitting element 101 is provided signaling point mapping device 102, wavelet inverse transformation device 103, as SSB (monolateral band) modulator 107, D/A converter 104, transmit amplifier 105 and the band pass filter 106 of transmission frequency transducer.And receiving element 111 is equipped with band pass filter 112, amplification controller 113, the SSB demodulator 117 as the receive frequency transducer, wavelet transform device 115, code element judgement device 116.Device for power line carrier communications 100 has been arranged transmitting element 101, receiving element 111, power line coupling circuit 121 and control unit 122.

The operation of the device for power line carrier communications 100 that uses above-mentioned layout is described referring now to Fig. 4 and Fig. 5.For the purpose of simplifying the description, in this embodiment pattern 2, suppose that when being used for that service band is subdivided into the wavelet transform of 4 frequency bands each filter of formation wavelet transform device has by the quantity " N " with subcarrier and multiply by 2 filter lengths that obtain.And, should be understood that the class of operation of carrying out is similar to the operation of embodiment pattern 1 except the frequency displacement operation in this embodiment pattern 2.

Use Fig. 4 that the data flow of transmitting element 101 is described at first, now.The data (sending bit series) that signaling point mapping device 102 at first will send by segmentation produce a plurality of bit streams with suitable length.For example, signaling point mapping device 102 is subdivided into data flow " 00 ", " 01 ", " 11 ", " 10 ", " 10 ", " 11 ", " 01 " and " 00 " of 2 bits with such data (sending bit series) " 0001111010110100 ", so that produce the bit stream that is assigned to corresponding subcarrier.Then, signaling point mapping device 102 is mapped to the corresponding bit stream of " 00 ", " 01 " of these generations, " 11 ", " 10 " corresponding to the signaling point such as PAM (pulse amplitude modulation) signaling point of "+1 ", "+3 ", " 3 ", " 1 ".Then, signaling point mapping device 102 distributes these PAM signaling point data to be used as " T1 " to the input unit of wavelet inverse transformation device 103.Wavelet inverse transformation device 103 is carried out wavelet inverse transformation operation by using two groups of PAM signaling point data that are assigned to " T1 ", so that export the sampled value of the transmission waveform on time shaft during a code element.This sends sampling series single side-band modulator 107 frequency displacements.D/A converter 104 is exported this time sampling value (time waveform series data) in the constant sampling time.Transmit amplifier 105 sends waveform with this and is amplified to the transmission signal level, and then, band pass filter 106 is removed unnecessary frequency component from institute's amplified transmission signal.Power line coupling circuit 121 has been used as being used for the signal of power line communication by the signal of band pass filter 106 waveform shapings to power line 110 outputs.Above-mentioned operation is corresponding to the explanation of the data flow operations during transmit operation.

The data flow operations of receiving element then, is described referring now to Fig. 5.

At first, power line coupling circuit 121 extracts electric-power wire communication signal from power line 110.Band pass filter 112 is removed the noise signal that is positioned at outside the service band from the electric-power wire communication signal that is extracted, then to the filtered signal of communication of amplification controller 113 outputs.The signal level of amplification controller 113 these filtered signals of communication of control is so that covered by the dynamic range of A/D converter 114.Then, A/D converter 114 at timing sampling this analog signal waveform identical with the sampling timing of transmitting terminal to obtain digital waveform data.SSB demodulator 117 is a numerical data in the base band scope with this digital signal down variable frequency.This Wave data of wavelet transform device 115 wavelet transforms is so that each subcarrier obtains the signaling point data.Code element judges that these signaling point data of device 116 inverse mappings are to revert to most probable bit stream with these signaling point data, so that can obtain to receive data.Above-mentioned operation is the explanation in the data flow operations of reception period.

Because used the above-mentioned layout of device for power line carrier communications 100, therefore, be similar to embodiment pattern 1, no longer need be in the OFDM transmitting system required such as protection redundant signals part at interval, so can improve transmitting efficiency.And, because can operate the Fourier transform operation that needing to realize plural number calculating, therefore can reduce total amount of calculation by the such wavelet transform of calculating cause of carrying out real part, and, circuit size can be reduced.And, because can carry out move operation to optional frequency, therefore the device for power line carrier communications of this embodiment pattern 2 can easily be applied to such situation: for example, the indoor use frequency band different with outdoor application is caught to differ from one another in each country.As a result, and compare under the situation of the power line carrier communication that only in the base band transmitting system, can obtain, can further reduce circuit size.

(embodiment mode 3)

Fig. 7 is the block diagram that is used to indicate according to the device for power line carrier communications 100 of embodiments of the invention mode 3.

In Fig. 7, Reference numeral 101 shows transmitting element, Reference numeral 111 indication receiving elements.Transmitting element 101 is provided signaling point mapping device 102, wavelet inverse transformation device 103, D/A converter 104, quadrature modulator 108, transmit amplifier 105 and band pass filter 106.And receiving element 111 is equipped with band pass filter 112, amplification controller 113, A/D converter 114, quadrature demodulator 118, wavelet transform device 115, code element judgement device 116.Device for power line carrier communications 100 has been arranged transmitting element 101, receiving element 111, power line coupling circuit 121 and control unit 122.

The operation of the device for power line carrier communications 100 that uses above-mentioned layout is described referring now to Fig. 8 and Fig. 9.Fig. 8 is the key diagram of operation that is used to illustrate the transmitting element 101 of device for power line carrier communications 100.Fig. 9 is the key diagram of operation that is used to illustrate the receiving element 111 of device for power line carrier communications 100.For the purpose of simplifying the description, in this embodiment mode 3, suppose that when being used for that service band is subdivided into the wavelet transform of 4 frequency bands each filter of formation wavelet transform device has by the quantity " N " with subcarrier and multiply by 2 filter lengths that obtain.

Use Fig. 8 that the data flow of transmitting element 101 is described at first, now.

The data (sending bit series) that signaling point mapping device 102 at first will send by segmentation produce a plurality of bit streams with suitable length.For example, signaling point mapping device 102 is subdivided into data flow " 00 ", " 01 ", " 11 ", " 10 ", " 10 ", " 11 ", " 01 " and " 00 " of 2 bits with such data (sending bit series) " 0001111010110100 ", so that produce the bit stream that is assigned to corresponding subcarrier.Then, signaling point mapping device 102 is mapped to signaling point corresponding to the compositum of quadrature amplitude modulation (qam) system with the corresponding bit stream of " 00 ", " 01 " of these generations, " 11 ", " 10 ".At this moment, described composite signal point data is assigned to real part and imaginary part.Wavelet inverse transformation device 103 respectively wavelet inverse transformation operation carries out in real part and imaginary part by using two groups of signaling point data that are assigned to " T2 ", so that export the sampled value of the transmission waveform on time shaft during a code element.At this moment, the sampled value of transmission waveform remains the form of plural number.This composite signal of quadrature modulator 108 quadrature modulation is so that arrive carrier frequency band arbitrarily with this composite signal frequency displacement.D/A converter 104 was exported by this time sampling value of frequency displacement in the constant sampling time.Transmit amplifier 105 sends waveform with this and is amplified to the appropriate signals level, and then, band pass filter 106 is removed unnecessary frequency component from institute's amplified transmission signal.Power line coupling circuit 121 has been used as being used for the signal of power line communication by the signal of band pass filter 106 waveform shapings to power line 110 outputs.Above-mentioned operation is corresponding to the explanation of the data flow operations during transmit operation.

The operation of receiving element 111 then, is described referring now to Fig. 9.

At first, power line coupling circuit 121 extracts electric-power wire communication signal from power line 110.Band pass filter 112 is removed the noise signal that is positioned at outside the service band from the electric-power wire communication signal that is extracted, then to the filtered signal of communication of amplification controller 113 outputs.The signal level of amplification controller 113 these filtered signals of communication of control is so that covered by the dynamic range of A/D converter 114.Then, A/D converter 114 at timing sampling this analog signal waveform identical with the sampling timing of transmitting terminal to obtain digital waveform data.Quadrature demodulator 118 is down-converted to this Wave data in the base band scope, so that be converted into compound baseband signal.These composite wave-shape data of wavelet transform device 115 wavelet transforms are so that each subcarrier obtains the composite signal point data.Code element judges that these signaling point data of device 116 inverse mappings are to revert to most probable bit stream with these signaling point data, so that can obtain to receive data.Above-mentioned operation is the explanation in the data flow operations of reception period.

Because it is used the above-mentioned layout of device for power line carrier communications 100, therefore, no longer need be in the OFDM transmitting system required such as protection redundant signals part at interval, so can improve frequency utilization efficient.And, because can use the signaling point data of compositum, therefore can further improve frequency utilization efficient by carrying out quadrature modulation/demodulation operation.

(embodiment pattern 4)

According to the layout of the power line carrier communication of embodiments of the invention pattern 4 corresponding to the layout shown in Fig. 3, Fig. 6 or Fig. 7.In this embodiment pattern 4, such situation is described: arrange wavelet inverse transformation device 103 and wavelet transform device 115 by general lapped orthogonal transform (GLT).GLT is corresponding to such fact: the structure of coming the orthogonal transform (LOT) of vague generalization stack for the number of taps of filter.

Figure 10 A is the figure of example that is used for being illustrated in graphically the impulse response of each filter that the bank of filters circuit that is used to realize to have the GLT of complete reconstruction in 4 fens uses, and Figure 10 B is the figure of example that is used for being illustrated in graphically the frequency response of each filter that the bank of filters circuit that is used to realize to have the GLT of complete reconstruction in 4 fens uses.

Should be understood that in this embodiment pattern 4, realize that the bank of filters circuit of GLT is made of the FIR bank of filters.Perhaps, this bank of filters circuit can be made of multiphase filter or network.And this embodiment pattern 4 has represented to realize to have the example of bank of filters circuit of the GLT of complete reconstruction.Perhaps, can use bank of filters circuit with accurate complete reconstruction.Because described bank of filters circuit is made of the complete reconstruction of standard, therefore, compare by the situation that complete reconstruction constitutes with the bank of filters circuit, can be reduced in the secondary lobe in the corresponding subcarrier further.

Because constructed the bank of filters circuit that has as the indicated filter factor of Figure 10 A and 10B, therefore, all filters that can use in the bank of filters circuit of realizing wavelet transform provide linear phase characteristic.Because all filters have linear phase characteristic, therefore the sum of the multiplexer that needs can be reduced half in the bank of filters circuit, therefore can reduce circuit size.And, therefore because the frequency characteristic of each such subcarrier can be designed such that precipitously when main lobe is positioned at the center, can reduce the detrimental effect that the interference that is provided by other subcarriers and the noise that produces cause outside service band receiving operating period.

(embodiment pattern 5)

According to the layout of the power line carrier communication of embodiments of the invention pattern 5 corresponding to the layout shown in Fig. 3, Fig. 6 or Fig. 7.In this embodiment pattern 5, such situation is described: the modulated lapped transform (mlt) (ELT) by expansion is arranged wavelet inverse transformation device 103 and wavelet transform device 115.ELT is corresponding to such fact: the structure of conversion (MLT) of coming the stack of vague generalization modulation for the number of taps of filter.

Figure 11 A is the figure of example that is used for being illustrated in graphically the impulse response of each filter that the bank of filters circuit that is used to realize 4 fens ELT structures uses, and Figure 11 B is the figure of example that is used for being illustrated in graphically the frequency response of each filter that the bank of filters circuit that is used to realize 4 fens ELT structures uses.

Should be understood that in this embodiment pattern 5, realize that the bank of filters circuit of ELT structure is made of the FIR bank of filters.Perhaps, this bank of filters circuit can be made of multiphase filter or network.

Because arranged the bank of filters circuit of the filter factor that has shown in Figure 11 A and 11B, therefore, and compare in LOT structure described in the embodiment pattern 4 or GLT structure, can further reduce the secondary lobe of subcarrier.And, because the frequecy characteristic of each such subcarrier can be designed such that precipitous when main lobe is positioned at the center, therefore can reduce the detrimental effect that the interference that is provided by other subcarriers and the noise that produces cause outside service band receiving operating period, and not need the frequency band block filter.In traditional system, need this frequency band block filter, so that do not provide detrimental effect to the existing system in device for power line carrier communications 100.

(embodiment pattern 6)

In embodiments of the invention pattern 6, such situation is described: the wavelet inverse transformation device 103 and the wavelet transform device 115 that are configured for the device for power line carrier communications 100 of pie graph 3, Fig. 6, Fig. 7 by multiphase filter referring now to Figure 12 A, 12B, Figure 13 A and Figure 13 B.Figure 12 A is the block diagram that is used to represent the band synthesis filter group circuit that is made of general FIR filter, and Figure 12 B is the block diagram that is used to illustrate the frequency band division bank of filters circuit that is made of general FIR filter.Figure 13 A is the block diagram that is used to indicate the band synthesis filter group circuit that is made of multiphase filter, and Figure 13 B is the block diagram that is used to illustrate the frequency band division bank of filters circuit that is made of multiphase filter.

At first, illustrate by using the layout of the bank of filters circuit that general FIR filter arranges referring now to Figure 12 A and 12B.In Figure 12 A and 12B, Reference numeral 201 indications are used for the signals sampling rate be multiply by " N " up-sampler doubly, Reference numeral 202 shows the FIR filter, the FIR bank of filters that Reference numeral 203 expressions form by a plurality of orthogonal FIR filters 202 of combination, Reference numeral 204 indication two-input adders.Use above-mentioned circuit arrangement, can arrange band synthesis filter group circuit 200 as wavelet inverse transformation device 103.

And Reference numeral 211 expression FIR filters, Reference numeral 212 show by making up the FIR bank of filters that a plurality of orthogonal FIR filters 211 form, and Reference numeral 113 expression down-samplers are used for sample rate is reduced 1/N.Use above-mentioned circuit arrangement, can arrange frequency band division bank of filters circuit 210 as wavelet transform device 115.

Also should be noted that, arrange the corresponding FIR filter 202 and 211 of the FIR bank of filters 212 of the FIR bank of filters 203 that constitutes wavelet inverse transformation device 103 and frequency band division bank of filters circuit 210 in following mode: make that the input signal of wavelet transform device 115 is consistent with the output signal of this wavelet transform device 115 except signal delay.For example, the filter factor as satisfying this condition it is contemplated that following table 1 and table 2:

[table 1]

Table 1: the example of the filter factor of wavelet inverse transformation device (band synthesis filter group circuit)

Table 2: the example of the filter factor of wavelet transform device (frequency band division bank of filters circuit)

The filter factor of indication is corresponding to an example that with a scope division is 4 bank of filters circuit in table 1 and table 2.In this example, code element " h " shows a general FIR filter.This FIR filter comprises 7 delay elements, 8 multipliers and 7 adders.These 7 delay element cascades each other, and postpone the input data.Described 8 multipliers multiply by coefficient with the dateout of this delay element and above-mentioned input data.Described 7 adders in regular turn from its input each other the dateout of addition multiplier to obtain accumulated value.Code element " tap " shows above-mentioned multiplier, the coefficient of above-mentioned 8 multipliers of symbol " α " indication.Equally, the symbol " M " that comprises in symbol " α MN " illustrates the filter numbering, symbol " N " expression tap numbering.

Then, with reference to Figure 13 A and 13B the bank of filters circuit of arranging by multiphase filter is described.In Figure 13 A and 13B, Reference numeral 301 shows multiphase filter, Reference numeral 302 indications are used for the signals sampling rate be multiply by the up-sampler of N, Reference numeral 303 expression two-input adders, Reference numeral 304 indications are used for the delay element (register) with an input sampling time of data delay.Use above-mentioned circuit element, can arrange band synthesis filter group circuit 300 as wavelet inverse transformation device 103.

And Reference numeral 311 shows the delay element that is used for input 1 sampling time of data delay, and Reference numeral 312 expressions are used for sample rate is reduced the down-sampler of 1/N, Reference numeral 313 indication multiphase filters.Use above-mentioned circuit element, can arrange frequency band division bank of filters circuit 310 as wavelet transform device 115.

Figure 14 is used for the multiphase filter 301 of identification number Figure 13 A and 13B and 313 block diagram.In Figure 14, Reference numeral 321 indication filters, Reference numeral 322 illustrates two-input adder.The respective filter that constitutes multiphase filter 301 and multiphase filter 313 is arranged in the following manner: make that the input signal of band synthesis filter group circuit 300 is consistent with the output signal of frequency band division bank of filters circuit 310 except signal delay.Mutually the same in order to make by the result of calculation of table 1 and table 2 acquisition, can arrange corresponding multiphase filter as shown in the table 10 as arriving at table 3.

[table 3]

Table 3: the filter factor of the heterogeneous Filter_1 of band synthesis filter group circuit

[table 4]

Table 4: the filter factor of the heterogeneous Filter_2 of band synthesis filter group circuit

[table 5]

Table 5: the filter factor of the heterogeneous Filter_3 of band synthesis filter group circuit

[table 6]

Table 6: the filter factor of the heterogeneous Filter_4 of band synthesis filter group circuit

[table 7]

Table 7: the filter factor of the heterogeneous Filter_1 of frequency band division bank of filters circuit

[table 8]

Table 8: the filter factor of the heterogeneous Filter_2 of frequency band division bank of filters circuit

[table 9]

Table 9: the filter factor of the heterogeneous Filter_3 of frequency band division bank of filters circuit

[table 10]

Table 10: the filter factor of the heterogeneous Filter_4 of frequency band division bank of filters circuit

Differential point between the bank of filters circuit of the bank of filters circuit of Figure 12 A and 12B and Figure 13 A and 13B is the technology point: the circuit position that is used to change sample rate differs from one another.In band synthesis filter group circuit 200 and 300, be imported at signal before the FIR filter of Figure 12 A and 12B, described signal is sampled, and after calculating by the filtering of the multiphase filter among Figure 13 A and the 13B, described signal is sampled.On the other hand, in frequency band division bank of filters circuit 210 and 310, after calculating by the filtering of the FIR filter among Figure 12 A and the 12B, described signal is by down-sampling, and before calculating by the filtering of multiphase filter, described signal is by down-sampling.In other words, can come the filtering among execution graph 13A and the 13B to calculate to calculate slower speed than the filtering among Figure 12 A and the 12B.

In this embodiment pattern 6, be configured for the timing control unit of the filter output of band synthesis filter group circuit by using up-sampler 302, two-input adder 303 and delay element 304.Perhaps, can arrange this timing control unit by multiplexer.

As a result, use sort circuit to arrange, when carrying out modulation and demodulation, can carry out the calculating during overlapping orthogonal transform with low rate.In other words, because can reduce working clock frequency, therefore can reduce the power consumption of circuit.And, when when the angle of the amount of calculation that can reduce each unit interval considers that this is true, can use calculator to replace, so that reduce circuit size.

(embodiment mode 7)

Figure 15 A is the block diagram that is used to represent as the band synthesis filter group circuit 400 of the wavelet inverse transformation device 103 of the device for power line carrier communications 100 shown in Fig. 3, Fig. 6, Fig. 7.Figure 15 B is the block diagram that is used to indicate as the frequency band division bank of filters circuit 410 of the wavelet transform unit 115 of the device for power line carrier communications 100 shown in Fig. 3, Fig. 6, Fig. 7.As the bank of filters circuit, indicated ELT bank of filters circuit with network.In other words, in this embodiment mode 7, following situation has been described: arrange wavelet inverse transformation device 103 and wavelet transform device 115 by such bank of filters circuit with network.

In Figure 15 A and 15B, Reference numeral 401 shows discrete cosine transform (DCT) device of type i V, Reference numeral 402 indications are used for the delay element with input 1 sampling time of data delay, Reference numeral 403 expression Ji Wensi (GIVENS) rotary calculators, another is used for Reference numeral 404 expressions and will imports the delay element in 2 sampling times of data delay, and Reference numeral 405 expressions are used for the signals sampling rate be multiply by the up-sampler of N.And Reference numeral 406 shows two-input adder, and Reference numeral 407 expressions are used for the delay element with an input sampling time of data delay.Use above-mentioned circuit element to arrange band synthesis filter group circuit 400.On the other hand, Reference numeral 411 shows the delay element that is used for input 1 sampling time of data delay, Reference numeral 412 illustrates the down-sampler that is used for sample rate is reduced 1/N, Reference numeral 413 indications are used for the delay element with input 2 sampling times of data delay, Reference numeral 414 expression Ji Wensi (GIVENS) rotary calculators, another is used for Reference numeral 404 expressions and will imports the delay element in 1 sampling time of data delay, the discrete cosine transformer spare of Reference numeral 416 indication type i V.Use above-mentioned circuit element to arrange frequency band division bank of filters circuit 410.Also should be noted that by organizing such plane rotation counting circuit combination with one another shown in Figure 16 more and constitute two Ji Wensi (GIVENS) rotary calculator 403 and 414.Figure 16 is the functional-block diagram that is used to represent plane rotation counting circuit.

Be similar to the above-mentioned situation of using multiphase filter to arrange the bank of filters circuit passing through described in the embodiment pattern 6, use sort circuit to arrange, the computation rate during when carrying out modulation and demodulation, can being reduced in lapped orthogonal transform.And, because therefore high speed DCT etc. and sort circuit arrangement combinations also can reduce amount of calculation, so that can reduce the power consumption and the circuit size of circuit.

(embodiment pattern 8)

In embodiments of the invention pattern 8, the method below illustrating now.Promptly, in the wavelet transform device 115 of the device for power line carrier communications 100 of the wavelet inverse transformation device 103 of the device for power line carrier communications 100 of Fig. 3, Fig. 6, Fig. 7 and Fig. 3, Fig. 6, Fig. 7, in a plurality of patterns of preparing the filter factor corresponding with overlapping coefficient, explanation now is used to change the method for these filter factors.

At first, for the wavelet inverse transformation device 103 of transmitting element 101 and the wavelet transform device 115 of receiving element 111, prepare to have a plurality of patterns of filter factor of different filter lengths corresponding to overlapping coefficient.Then, come the pattern numbering of given filter, so that number the filter factor that changes in the bank of filters circuit according to described pattern by transmitting element 101 and receiving element 111 control unit 122 separately.At this moment, must number consistent in the pattern numbering of the filter of transmitting terminal with pattern by using control signal to wait to make at the filter of receiving terminal.And, as the reference that is used to change filter factor, can consider from the electric-power wire communication signal of transmitting element 101 transmissions, the variation and the incoming level of transmission path.For example, under the situation of using S/N ratio (being the ratio of signal power) to noise power, when when reception operating period S/N ratio is big, because the noise that occurs outside service band is low, therefore from respective sub carrier, the filter that has short filter length by use is carried out demodulation operation, and when S/N ratio hour, use has the filter factor of long filter length, so that be not easy by the noise effect that occurs from other frequency bands.

Because carried out this control operation, the noise conditions that can be reduced in transmission path is the amount of calculation under the situation preferably, therefore, can be lowered in the power consumption that receives operating period.And, even under the relatively poor situation of noise conditions, also can carry out stable reception operation.

(embodiment pattern 9)

In embodiments of the invention pattern 9, the method below illustrating.Promptly, under the situation of wavelet inverse transformation device 103 that comes layout plan 3, Fig. 6, Fig. 7 by the use network and wavelet transform device 115, when preparing a plurality of patterns of plane anglec of rotation parameter corresponding to overlapping coefficient, explanation now is used to change the method for these plane anglec of rotation parameters.

At first, constitute the wavelet inverse transformation device 103 of transmitting element 101 and the wavelet transform device 115 of receiving element 111 by the network that in the embodiment mode 7, illustrates.Then, for the wavelet inverse transformation device 103 of transmitting element 101 and the wavelet transform device 115 of receiving element 111, prepare a plurality of patterns of plane anglec of rotation parameter corresponding to overlapping coefficient.Then, come the mode number of given plane anglec of rotation parameter, so that change plane anglec of rotation parameter in the bank of filters circuit according to mode number by transmitting element 101 and receiving element 111 control unit 122 separately.At this moment, must be by using control signal to wait to make mode number in the plane of transmitting terminal anglec of rotation parameter with consistent in the mode number of the plane of acceleration anglec of rotation parameter.And, as the reference that is used to change plane anglec of rotation parameter, can consider from the electric-power wire communication signal of transmitting element 101 transmissions, the variation and the incoming level of transmission path.For example, under the situation of using the S/N ratio, when when reception operating period S/N ratio is big, because the noise that occurs outside service band is low, therefore from respective sub carrier, the plane anglec of rotation parameter that has little overlap coefficient by use is carried out demodulation operation, and when S/N ratio hour, use has the plane anglec of rotation parameter of big overlap coefficient, so that be not easy by the noise effect that occurs from other frequency bands.

Because carried out this control operation, the noise circumstance that can be reduced in transmission path is the amount of calculation under the situation preferably, therefore, can be lowered in the power consumption that receives operating period.And, even under the relatively poor situation of noise conditions, also can carry out stable reception operation.And, compare with the embodiment pattern 8 of a plurality of patterns of wherein preparing filter factor, can reduce memory capacity.

(embodiment pattern 10)

Figure 17 is the key diagram that is used to illustrate the control operation of the control unit 122 that according to the control method of the device for power line carrier communications of embodiments of the invention pattern 10, promptly passes through Fig. 3, Fig. 6 or Fig. 7.In this embodiment pattern 10, such situation is described: only export particular carrier wave.For the purpose of simplifying the description, the sum of subcarrier is selected as four.

In Figure 17, Reference numeral 102 shows the signal map device, Reference numeral 103 indication wavelet inverse transformation devices, Reference numeral 122 expression control units.

At first, in signaling point mapping device 102, suppose the data that output is such, wherein come mapped signal point with the order of "+1 ", "+3 ", " 3 ", " 1 ", "+1 ", "+3 ", " 3 ", " 1 ".At this moment, because control unit 122 has been specified the sub-carrier number that is not used in signaling point mapping device 102, so data are not imported into the subcarrier part of specified numbering.In other words, insert zero.For example, under the situation of not exporting first subcarrier and fourth officer carrier wave, in the importation of the filter of exporting first subcarrier and fourth officer carrier wave, insert zero, and the signaling point data of input mapping in the importation of second subcarrier and the 3rd subcarrier.Then, wavelet inverse transformation device 103 is carried out wavelet inverse transformation operation according to corresponding input data.

Because come executive control operation by this way, therefore can easily select the subcarrier that will export, and can be only in specific frequency output signal.In other words, even but under the legal restrictions national owing to each causes situation that the service band of each country differs from one another, also can easily carry out this control method of device for power line carrier communications adaptive.

And, referring now to Figure 18, Figure 19 and Figure 20 validity characteristic according to the power line carrier communication of this embodiment pattern 10 is described clearly.That is, Figure 18 is the figure that is used to represent the example of frequency spectrum that power line carrier communication is allowed.Figure 19 is used in reference to the figure that is shown in the transmission spectrum under the situation of using the OFDM transmission system.Figure 20 is the figure that is used to indicate the transmission spectrum of device for power line carrier communications.

For example, suppose as shown in figure 18, provide Frequency Distribution by certain national legal restrictions control.Sit by and watch as Figure 19, defined the transmission signals that produces by the conventional powerline carrier communication apparatus that uses the OFDM transmission system.As a result, need a frequency band block filter in addition, so that satisfy legal restrictions indicated in Figure 18 (Frequency Distribution).In other words, must prepare the filter factor of frequency band block filter by each country with differing from one another.On the other hand, according to the device for power line carrier communications of this embodiment pattern 10, can be only obtain as shown in figure 20 transmission signals frequency spectrum according to above-mentioned control operation.As a result, no longer need such frequency band block filter.Therefore, the device for power line carrier communications according to this embodiment pattern 10 can be fitted to the various legal restrictions that effectively differ from one another in each country neatly.

(embodiment pattern 11)

Figure 21 is the key diagram that is used to illustrate the control operation of the control unit 122 that according to the control method of the device for power line carrier communications of embodiments of the invention pattern 11, promptly passes through Fig. 3, Fig. 6, Fig. 7.In this embodiment pattern 11, the method that is used to detect the noise level on power line is described.

In Figure 21, Reference numeral 116 shows code element and judges device, Reference numeral 115 indication wavelet transform devices, Reference numeral 122 expression control units.

Then, the noise level detecting operation of present explanation on power line.

At first, the data of wavelet transform device 115 demodulation input are to obtain the signaling point data of each subcarrier, so that detect the frequency distribution of the noise that occurs on power line 110.Then, code element judges whether big near the noise component(s) of that signaling point existence device 116 is measured according to the signaling point data of each subcarrier.At this moment, under the situation that noise occurs by halves, all signaling point data in each subcarrier become 0.As a result, code element judges that device 116 comes the predict noise amount by checking the degree that this data value moves.Then, code element is judged the subcarrier of device 116 its noise levels of judgement greater than predetermined value, and notifies its sub-carrier number to control unit 122, so that control unit 122 can not use this notified subcarrier.

Should be noted that in this embodiment pattern 11, the noise level detection method of carrying out under signal is not superimposed upon condition on the power line 110 has been described.Perhaps, even, also can come the detection noise level according to similar noise level detection method when between transmitting terminal and acceleration, having used known signal.In other words, even can under communication condition, also carry out noise measuring.

Because carry out such control operation, therefore can grasp the noise conditions on power line 110, and can select available subcarrier.In control unit 122, select subcarrier in the mode of the frequency location of the noise component(s) that can avoid in advance wherein providing big, so that can realize having the communication of higher reliability.

(embodiment pattern 12)

As the control method of in device for power line carrier communications, carrying out, the control method that is used for transfer rate is changed into command speed is described referring now to Fig. 3 and Fig. 4 according to embodiments of the invention pattern 12.

At first, control unit 122 calculates the sum of the needed signaling point of transfer rate that is used to realize outside appointment and the sum of subcarrier, selects subcarrier according to these result of calculations with according to the judged result of the available subcarriers of embodiment pattern 11 then.Then, control unit 122 is specified subcarrier label that will use and the signaling point sum that shines upon device 102 for signaling point.Signaling point mapping device 102 and the signaling point that shines upon accordingly for the data placement processing operation of subcarrier according to this value of setting.

For example, suppose the outside necessary transfer rate of specifying, and the quantity by subcarrier be 2 and the quantity of signaling point be 4 to limit and calculated so that be fitted to result by the transfer rate of control unit 122 appointments.And, suppose that except second subcarrier, available subcarrier equals 3 in the judgement of carrying out according to embodiment pattern 11.At this moment, control unit 122 can be selected for example first subcarrier and the 3rd subcarrier.And, can in another communication, use untapped another subcarrier (i.e. fourth officer carrier wave in this example).

Because carried out such control operation, therefore can easily transfer rate be changed into the speed of appointment.And, because can in another communication, use such subcarrier except the subcarrier of the transfer rate that is used to realize appointment, therefore can improve the service efficiency of frequency band.

(embodiment pattern 13)

Figure 22 is the flow chart that is used for illustrating according to the operation of the control unit 122 that uses at device for power line carrier communications of one embodiment of the present of invention pattern 13.In this embodiment pattern 13, the control method below illustrating now.Promptly, under the situation of common reception operating period generation error in the reception data, be shifted so that when avoiding the detrimental effect of noise in the position of the frequency that will send, make that the communication sequence between device for power line carrier communications 1 (for example Zi You device) and another device for power line carrier communications 2 (for example device of communication counterpart) is consistent each other.Should be noted that device for power line carrier communications 1 and device for power line carrier communications 2 have the layout of Fig. 3.

In Figure 22, under initial condition (step S11 and S21), use carrier mode 1 is carried out the communication between device for power line carrier communications 1 and device for power line carrier communications 2.Then, under the situation of sum more than or equal to the specified threshold in device for power line carrier communications 1 (step S12) of error, detect the subcarrier (step S13) that its number of errors surpasses this specified threshold, and numbering or position (the step S14) of the temporary transient setting subcarrier that will change.The pattern that should be noted that the carrier wave that change this moment is set to carrier mode 2.Thereafter, the content of set carrier mode 2 is sent to device for power line carrier communications 2 (step S15) by the current carrier mode that uses 1 in communication.Thereafter, device for power line carrier communications 1 is changed into carrier mode 2 with the carrier mode of itself.Should be noted that also such carrier mode is by single subcarrier or organize subcarrier more and constitute.

Receiving by carrier mode 1 in the device for power line carrier communications 2 of carrier mode 2, judging whether to have changed carrier mode (step S22).If do not change carrier mode, then handle operation and return common processing operation (step S21).On the contrary, when changing carrier mode, the frequency location of being handled by overlapping orthogonal transform by receiving element 111 is changed and is carrier mode 2 (step S23).And, modulate the fact that changes carrier mode by carrier mode 2, the described fact is used as to change to finish to notify returns device for power line carrier communications 1 (step S24).

In device for power line carrier communications 1, judged whether correctly to send the content (step S16) that notice is finished in this change.Then, finish under the situation of notice correctly having received to change, to handle operation and advancing to common processing operation (step S11).On the contrary, finish under the situation of notice correctly not receiving to change, the threshold value of S/N ratio is changed (step S17), then, handles the selection that operation advances to carrier mode once more and handles operation (step S13).Then, power line carrier communication 1 is carried out the series of operations that changes carrier mode once more, and repeats this series of operations up to the quantity that reduces error.

In this case, can not only when carrying out common communication and when during initial fitting operation, carrying out setting operation, also utilize above-mentioned series of operations.

Also should be noted that in this embodiment pattern 13,, therefore reduced the sum that receives error because the subcarrier that will use is changed.Perhaps, arrange, therefore can reduce the sum of error because changed the signaling point of signaling point mapping device 102.For example, shown in Figure 23 A and 23B, the signaling point of 4 values arranges that can be changed is two kinds of method for arranging, can be by being implemented in the matching properties of communication period with the similar means of the series of operations of this embodiment pattern 13.In this case, Figure 23 A and Figure 23 B are the key diagrams of change of signaling point quantity that is used to illustrate the signaling point mapping device 102 of device for power line carrier communications.

As mentioned above,,, compare, can reduce the sum that receives error with the subcarrier that its error rate is big because come in communication, to use the little subcarrier of its error rate with the highest priority according to this embodiment pattern 13.

(embodiment pattern 14)

Figure 24 is the flow chart that is used to illustrate according to the operation of the device for power line carrier communications of embodiments of the invention pattern 14.In this embodiment pattern 14, carry out following operation: change device for power line carrier communications 1 (transmission output level) according to another device for power line carrier communications 2 (for example device of communication counterpart).Should be understood that device for power line carrier communications 1 and device for power line carrier communications 2 have the layout of Fig. 3.

In Figure 24, under initial condition (step S31), power line carrier communication 1 is sent in the signal of specific output level.In device for power line carrier communications 2, receive the signal (step S41) of device for power line carrier communications 1, and each subcarrier is measured the S/N ratio.Then, device for power line carrier communications 2 comes to send output level change request (step S43) to device for power line carrier communications 1 according to average S/N value.

The device for power line carrier communications 1 that has received this S/N ratio and output level change request judges whether that there be (step 32) in described change request, this S/N value of backwards calculation sends to device for power line carrier communications 2 with described signal at this determined output level once more so that determine output level (step S34).

Because carried out this operation, therefore low and do not take place under the situation of communication error in the noise level of power line 110, can be reduced in the electrical power that needs in the transmission by reducing output level.

As above described according to embodiment pattern 14, because can be in the noise level on the power line low and do not produce under the situation of communication error and reduce output level, therefore can be reduced in the electrical power that needs in the transmission.

(embodiment pattern 15)

Figure 28 is the block diagram that is used to represent according to the power line communication apparatus of embodiments of the invention pattern 15.

In Figure 28, Reference numeral 10 shows power line, Reference numeral 11 expressions are used to be connected to the socket of power line 10, Reference numeral 12 indications are used for being coupled to the plug of socket 11, and Reference numeral 13 expressions are couple to power line 10 via plug 12 and socket 11 so that the coupler unit of executive communication operation.And Reference numeral 14 indication AGC (automatic gain control) circuit are used for amplifying WOFDM (based on the OFDM of wavelet) modulation signal in constant level.This WOFDM represents by using the ofdm system of wavelet function.Reference numeral 15 shows the WOFDM modulation circuit, be used to modulate the WOFDM modulation signal that has been amplified by agc circuit 14, Reference numeral 16 shows ALC (automatic electric-level control) circuit, and it will be amplified to necessary level from the WOFDM modulation signal that WOFDM modulation circuit 17 (aftermentioned) obtains.Reference numeral 17 expression WOFDM modulation circuits, be used for the WOFDM modulating data with output WOFDM modulation signal, and Reference numeral 18 shows control unit, be used to control the integrated circuit that comprises alc circuit 16, and also comprise received signal level testing circuit 19, be used to detect received signal level.

The operation of the power line communication apparatus of above-mentioned layout is used in explanation now.

Various household electrical appliance are connected to power line 10.As a result, the noise characteristic of power line 10 and impedance operator are unsettled.Under such environment, provide electric-power wire communication signal (WOFDM modulation signal) via coupler unit 13 to agc circuit 14 from plug 12, so that be amplified to enough level, at this level, this ofdm modulation signal can be by demodulation.Then, the WOFDM modulation signal that is exaggerated by WOFDM demodulating unit 15 wavelet transforms with by demodulation.Received signal level testing circuit 19 detects received signal level from demodulation result, and provides necessary transmitting power control signal " a " from control unit 18 to alc circuit 16.

In this case, represent availability feature with reference to Figure 29 by the transmission power control of WOFDM system.Figure 29 is the figure that is used for indicating graphically the frequency spectrum of the WOFDM system that has wherein arranged a plurality of subcarriers.

In Figure 29, abscissa shows frequency, the ordinate indicator range.When the transmission condition of power line 10 when being unsettled, it is big that the attenuation in high-frequency range becomes usually.As a result, because in high-frequency range, improved transmitted power, because can obtain effective power control operation.Obviously, can control any subcarrier under the condition of power line, be in the high-frequency range not only.

As mentioned above, according to this embodiment pattern 14, because power line communication apparatus comprises: agc circuit 14, the constant level that the WOFDM modulation signal that is used for importing is put into; WOFDM demodulator circuit 15 is used for the WOFDM signal that demodulation is amplified; WOFDM modulation circuit 17 is used for the WOFDM modulating data with output WOFDM modulation signal; Alc circuit 16, the WOFDM modulation signal that is used for obtaining from WOFDM modulation circuit 17 are amplified to necessary level; Control unit 18, be used to control entire circuit, comprising alc circuit 16 with have received signal level testing circuit 19, described received signal level testing circuit 19 is used to detect received signal level, can be controlled at the output level of the WOFDM modulation signal in the alc circuit 16 in response to received signal level.As a result, even when changing transfer characteristic,, and can stably send data at a high speed under whole reformed transfer characteristic even this power line communication apparatus also can be operated fully.

Equally, if control unit 18 is controlled alc circuit 16 in following mode: be the transmission output level that improves the WOFDM modulation signal that obtains from WOFDM modulation circuit 17 under the situation of not enough received signal level at the received signal level that detects by received signal level testing circuit 19, if and control unit 18 is controlled alc circuit 16 in following mode: under the high situation of the received signal level that detects by received signal level testing circuit 19, reduce the transmission output level of the WOFDM modulation signal that obtains from WOFDM modulation circuit 17, then can control the transmission output level of WOFDM modulation signal in response to received signal level.As a result, even this power line communication apparatus can also be operated fully, and can stably send data at a high speed before the transfer characteristic of this change.

And, if control unit 18 is controlled alc circuit 16 in following mode: the transmission output level of the WOFDM modulation signal that obtains from WOFDM modulation circuit 17 is beginning to be set to minimum transmission output level, if and control unit 18 is controlled alc circuit 16 in following mode: when the device from communication counterpart does not send any response, improve the transmission output level of the WOFDM modulation signal that obtains from WOFDM modulation circuit 17 in regular turn in the mode of stepping, then can carry out data communication by minimum transmit power with respect to the necessity of the variation in transfer characteristic.As a result, can reduce power consumption and parasitic radiation.

And, if control unit 18 is controlled alc circuit 16 in following mode: the transmission output level of the WOFDM modulation signal that obtains from WOFDM modulation circuit 17 is beginning to be set to maximum transmission output level, if and control unit 18 is controlled alc circuit 16 in following mode: reduce the transmission output level in response to the received signal level that is detected, then can set up stable communication from the incipient stage.As a result, can stably set up communication fast.

And, if control unit 18 is controlled alc circuit 16 in following mode: the transmission output level of the transmission output level of the WOFDM modulation signal that obtains from WOFDM modulation circuit 17 in the middle of beginning to be set to, if and control unit 18 is controlled alc circuit 16 in following mode: improve/reduce the transmission output level in response to the received signal level that is detected, then can be in response to electrical power for operation line communicator in the variation of the transfer characteristic of such intermediate level and correctly, wherein in described intermediate level, the possibility of setting up communication is big.

In addition, if control unit 18 is controlled alc circuit 16 in following mode: according to the condition of judging received signal such as the transmission quality of packet error rate, therefore the transmission output level of the WOFDM modulation signal that obtains from WOFDM modulation circuit 17 becomes suitable level in response to judged result, then by considering that not only detrimental effect that is caused by transmission path but also the detrimental effect that is caused by the noise that produces from other electrical equipment change transmission level, so that can improve the precision of data communication.

And, if the control operation of the transmission output level in alc circuit 16 is carried out in control unit 18 each grouping, then can promptly operate described power line communication apparatus in response to the condition changing of power line.

And, if control unit 18 then can improve at the traffic rate that has under the noise circumstance of pulse characteristic in the regularly control operation of the transmission output level of execution in alc circuit 16 arbitrarily.

And, if control unit 18 is only carried out the control operation of the transmission output level in alc circuit 16 for the subcarrier of necessity, then can suppress the average electrical power of transmit operation.

(embodiment pattern 16)

Figure 30 is the block diagram that is used to represent according to the electric line communication system of embodiments of the invention pattern 16.

In Figure 30, because power line 10, socket 11, plug 12, coupler unit 13, agc circuit 14, WOFDM demodulator circuit 15, alc circuit 16, WOFDM modulation circuit 17, control unit 18 and received signal level testing circuit 19 are similar among Figure 28 those, therefore the identical Reference numeral shown in Figure 28 is used as those Reference numerals that are used to represent these circuit, and therefore its explanation is omitted.In this accompanying drawing, female unit of reference number 1 indication, and subelement of reference number 2 expressions via power line 10 and this mother's unit communication.

The operation of the electric line communication system of such layout is used in explanation now.

As shown in figure 30, in this embodiment pattern 16, in order to simplify circuit, under agc circuit 14 and the situation in the control unit 18 that received signal electricity product keyword circuit 19 is not installed in the other side's electrical equipment (being the subelement 2 with respect to female unit 1 in this case), send transmitting power control signal " a " from female unit 1.The subelement 2 of power line control system is carried out for the transmission power control of subelement 2 own based on this transmitting power control signal " a " of another transmitting power control signal " b " of exporting from control unit 18 by reception and is operated then.As a result, can come electrical power for operation line communication system correctly with respect to the ball bearing made using of the variation of transfer characteristic by use.

As mentioned above, when agc circuit 14 and received signal level testing circuit 19 are not installed on the subelement 2, send from the necessary transmitted power of female unit 1 indication.Sending from subelement 2 under the situation of call, can under desirable condition, only set up one time communication link.Sending under the situation of call from female unit 1, needing repeatedly such call, so that correctly be arranged on the transmission power level in the subelement 2.As mentioned above, though need be from female unit send call more than 1 time, also can so that circuit more simplify.

As mentioned above, according to this embodiment pattern 16, have the electric line communication system of female unit 1 with the subelement 2 that is used for communicating by letter via power line 10 via female unit 1, this female unit 1 comprises: agc circuit 14, be used for will input the WOFM modulation signal be amplified to constant level; WOFDM demodulator circuit 15 is used for the WOFDM signal that demodulation is amplified; WOFDM modulation circuit 17 is used for the WOFDM modulating data with output WOFDM modulation signal; Alc circuit 16, the WOFDM modulation signal that is used for obtaining from WOFDM modulation circuit 17 are enlarged into necessary level; Control unit 18 is used to control entire circuit, and described entire circuit comprises alc circuit 16 and is used to detect the received signal level testing circuit 19 of received signal level.Subelement 2 comprises similarly: WOFDM demodulator circuit 15 is used for the WOFDM modulation signal that demodulation is imported; WOFDM modulation circuit 17 is used for the WOFDM modulating data with output WOFDM modulation signal; Alc circuit 16, the WOFDM modulation signal that is used for obtaining from OFDM modulation circuit 17 are enlarged into necessary level; Control unit 18 is used to control the entire circuit that comprises alc circuit 16.Because female unit 1 can send transmitting power control signal " a " to subelement 2 in response to received signal level, therefore, also can realize to accept such electric line communication system of the variation of transfer characteristic even when subelement 2 is made of the circuit arrangement of simplification.

And; even the transmission output level of the WOFDM modulation signal that obtains at the control unit 18 of female unit 1 so that from WOFDM modulation circuit 17 becomes maximum mode and controls under the situation of alc circuit 16; when when subelement 2 does not send response; if the control unit of female unit 1 18 indication alc circuits 16 then can be protected the subelement 2 under exceptional condition so that stop to send.

The present invention is based on Japanese patent application 2002-015058 number and 2002-061454 number, they are merged in by reference at this.Though only specifically described specific embodiment of the present invention, obviously under the situation that does not break away from the spirit and scope of the present invention, can carry out multiple modification to it at this.

Claims (14)

1. device for power line carrier communications comprises:

Transmitting element;

Receiving element;

The power line coupling unit is used for being used as electric-power wire communication signal with respect to the signal that the power line stack obtains from described transmitting element, and also is used for only extracting electric-power wire communication signal from power line;

Control unit is used to control described transmitting element and described receiving element structural detail separately, thus by using a plurality of subcarriers to come the executive communication operation;

Wherein said transmitting element comprises: signaling point mapping device is used for producing a plurality of bit streams so that described bit stream is mapped to the signaling point of corresponding subcarrier from the transmission data of input; Wavelet inverse transformation device is used for basis and modulates corresponding subcarrier by the signaling point data of each subcarrier of described signaling point mapping device mapping by orthogonal wavelet waveform, so that generation time waveform series data; D/A converter, the time waveform series data that is used for being produced by described wavelet inverse transformation device is converted to simulated time waveform series of signals;

Wherein said receiving element comprises: A/D converter is used for the electric-power wire communication signal that extracts from power line by the power line coupling circuit is carried out the digitlization conversion, to obtain the serial Wave data of sampling; The wavelet transform device, the sampling series Wave data wavelet transform that is used for obtaining by A/D converter is the signaling point data of corresponding subcarrier; Code element is judged device, is used for judging bit stream by the mapping of described signaling point mapping device by inverse mapping from a plurality of signaling point data of described wavelet transform device output, and is used for the synthetic each other bit stream of being judged and is used as receiving DS.

2. device for power line carrier communications comprises:

Transmitting element;

Receiving element;

The power line coupling unit is used for being used as electric-power wire communication signal with respect to the signal that the power line stack obtains from transmitting element, and also is used for only extracting electric-power wire communication signal from power line;

Control unit is used to control described transmitting element and described receiving element structural detail separately, thus by using a plurality of subcarriers to come the executive communication operation;

Wherein said transmitting element comprises: signaling point mapping device is used for producing a plurality of bit streams so that described bit stream is mapped to the signaling point of corresponding subcarrier from the transmission data of input; Wavelet inverse transformation device is used for basis and modulates corresponding subcarrier by the signaling point data of each subcarrier of signaling point mapping device mapping by orthogonal wavelet waveform, so that generation time waveform series data; The transmission frequency transducer, the time waveform series data frequency displacement that is used for exporting from described wavelet inverse transformation device is to predetermined carrier frequency band; D/A converter is used for the described time waveform series data from described transmission frequency transducer output is converted to simulated time waveform series of signals;

Wherein said receiving element comprises: A/D converter is used for the electric-power wire communication signal that extracts from power line by the power line coupling circuit is carried out the digitlization conversion, to obtain the serial Wave data of sampling; The receive frequency transducer, the sampling series Wave data frequency displacement that is used for being obtained by described A/D converter is to the base band scope, so that obtain baseband signal series; The wavelet transform device, being used for the described baseband signal series wavelet transform from described receive frequency transducer output is the signaling point data of corresponding subcarrier; Code element is judged device, is used for judging described bit stream by the mapping of described signaling point mapping device by inverse mapping from a plurality of signaling point data of described wavelet transform device output, and is used for the synthetic each other bit stream of being judged and is used as receiving DS.

3. device for power line carrier communications comprises:

Transmitting element;

Receiving element;

The power line coupling unit is used for being used as electric-power wire communication signal with respect to the signal that the power line stack obtains from transmission unit, and also is used for only extracting electric-power wire communication signal from power line;

Control unit is used to control described transmitting element and described receiving element structural detail separately, thus by using a plurality of subcarriers to come the executive communication operation;

Wherein said transmitting element comprises: signaling point mapping device is used for producing a plurality of bit streams so that described bit stream is mapped to the composite signal point of corresponding subcarrier from the transmission data of input; Wavelet inverse transformation device is used for basis and modulates corresponding subcarrier by the composite signal point data of each subcarrier of described signaling point mapping device mapping by orthogonal wavelet waveform, so that produce waveform series data recombination time; The quadrature modulation device is used for the described recombination time waveform series data of quadrature modulation from the output of described wavelet inverse transformation device, so as with described waveform series data frequency displacement recombination time to predetermined carrier frequency band; D/A converter is used for waveform series data recombination time from the output of wavelet inverse transformation device is converted to analog composite time waveform series of signals;

Wherein said receiving element comprises: A/D converter is used for the electric-power wire communication signal that extracts from power line by the power line coupling circuit is carried out the digitlization conversion, to obtain the serial Wave data of sampling; Quadrature demodulation device, the serial Wave data frequency displacement of described sampling that is used for exporting from described A/D converter are to the base band scope, so that obtain baseband signal series; The wavelet transform device, being used for the baseband signal series wavelet transform from described quadrature demodulation device output is the signaling point data of corresponding subcarrier; Code element is judged device, be used for judging described bit stream from a plurality of described signaling point data of described wavelet transform device output, and be used for the synthetic each other bit stream of being judged and be used as receiving DS by the mapping of described signaling point mapping device by inverse mapping.

4. according to any one device for power line carrier communications among the claim 1-3,

Wherein said wavelet inverse transformation device and described wavelet transform device have the lapped orthogonal transform function that lapped orthogonal transform function that full weight builds or quasi-full are rebuild, and perhaps have general lapped orthogonal transform function.

5. according to any one device for power line carrier communications among the claim 1-3,

Wherein, described wavelet inverse transformation device and described wavelet transform device have the lapped transform function of modulation or the modulated lapped transform (mlt) function of expansion.

6. according to any one device for power line carrier communications among the claim 1-3,

Wherein arrange described wavelet inverse transformation device and described wavelet transform device by multiphase filter group circuit.

7. according to any one device for power line carrier communications of claim 1-3,

Wherein arrange described wavelet inverse transformation device and described wavelet transform device by bank of filters circuit with network.

8. according to any one device for power line carrier communications of claim 1-3,

Wherein said wavelet inverse transformation device has corresponding to a plurality of filter coefficient patterns overlap coefficient, that have different filter lengths with described wavelet transform device, and, and from described a plurality of filter coefficient patterns, select a suitable filter coefficient pattern in response to the electric-power wire communication signal that sends from described transmitting element and the variation of transmission path and incoming level.

9. according to the device for power line carrier communications of claim 7,

Wherein said wavelet inverse transformation device and described wavelet transform device have a plurality of planes anglec of rotation parameter corresponding to overlap coefficient, and, and select a suitable plane anglec of rotation parameter from described a plurality of planes anglec of rotation parameter in response to the electric-power wire communication signal that sends from described transmitting element and the variation of transmission path and incoming level.

10. according to any one device for power line carrier communications among the claim 1-3,

Wherein said control unit is selected signal to the output of described signaling point mapping device, to select to be used to shine upon/subcarrier of modulating data; Described signaling point mapping device comes mapping (enum) data according to described selection signal with respect to selected subcarrier, and for unselected data map zero with respect to described subcarrier.

11. according to the device for power line carrier communications of claim 10,

Wherein said control unit comes with ratio prediction the noise conditions on power line of signal power to noise power by using the judged result of being made by described code element judgement device, so that detect the frequency band that under plateau, has big noise, and described control unit is controlled in the following manner: for existing the subcarrier that occurs in the frequency band of big noise, described selection signal not to be output to described signaling point mapping device under plateau.

12. according to the device for power line carrier communications of claim 10,

Wherein, for the control of the signaling point mapping of described signaling point mapping device and described selection signal for subcarrier, have in communication speed under the situation of high priority, described control unit increases by the sum of the signaling point of described signaling point mapping device mapping many-valued to obtain, and the reliability that sends in data has under the situation of high priority, and described control unit reduces the sum of the signaling point that is shone upon by signaling point mapping device to obtain binary value.

13. according to the device for power line carrier communications of claim 10,

Wherein, for the control of the signaling point mapping of described signaling point mapping device and described selection signal for subcarrier, described control unit is investigated the error rate of corresponding subcarrier, and, executive control operation by this way: in data communication, with the little subcarrier of limit priority use error rate.

14. according to any one device for power line carrier communications of claim 1-3,

Wherein, this transmitting element also comprises the transmit amplifier of the output that is used to amplify this D/A converter, and described control unit is provided with the gain of this transmit amplifier according to the ratio of signal power to the noise power of the received signal that received by described receiving element.

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