WO2006082675A1 - Dispositif d’émission, dispositif d’aide à l’émission, dispositif de réception, dispositif d’aide à la réception, système d’émission/réception et méthode de communication - Google Patents

Dispositif d’émission, dispositif d’aide à l’émission, dispositif de réception, dispositif d’aide à la réception, système d’émission/réception et méthode de communication Download PDF

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Publication number
WO2006082675A1
WO2006082675A1 PCT/JP2005/018837 JP2005018837W WO2006082675A1 WO 2006082675 A1 WO2006082675 A1 WO 2006082675A1 JP 2005018837 W JP2005018837 W JP 2005018837W WO 2006082675 A1 WO2006082675 A1 WO 2006082675A1
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WIPO (PCT)
Prior art keywords
order
power
modulation signal
parallel
multicarrier modulation
Prior art date
Application number
PCT/JP2005/018837
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English (en)
Japanese (ja)
Inventor
Akihiro Okuda
Masato Saito
Heiichi Yamamoto
Original Assignee
National University Corporation NARA Institute of Science and Technology
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Application filed by National University Corporation NARA Institute of Science and Technology filed Critical National University Corporation NARA Institute of Science and Technology
Priority to JP2007501506A priority Critical patent/JPWO2006082675A1/ja
Publication of WO2006082675A1 publication Critical patent/WO2006082675A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving

Definitions

  • Transmission device transmission auxiliary device, reception device, reception auxiliary device, transmission / reception system, and communication method
  • the present invention relates to a transmission device, a transmission auxiliary device, a reception device, a reception auxiliary device, a transmission / reception system, and a communication method that are used in a digital communication system and perform communication using a multicarrier modulation method.
  • the multi-carrier modulation method is a method in which a series of data is distributed to a large number of carriers and transmitted in parallel with respect to a single carrier method for carrying carriers.
  • OFDM Orthogonal frequency division multiple access
  • the Frequency Division Multiplexing method is resistant to frequency selective fading, and it is possible to reduce the effects of intersymbol interference in a multipath environment using guard intervals. I'll be.
  • CDMA Code Division
  • PN codes codes
  • MC-CDMA Multi-Carrier Code Division Multiple Access
  • the transmission signal of multicarrier transmission is the sum of modulated subcarriers, and therefore has a peak power much higher than the average power. Peak-to-average This is called the Power Ratio problem.
  • PAPR increases with the number of subcarriers constituting a signal. Therefore, in the OFD M and MC-CDMA systems, which are multicarrier modulation systems, the number of subcarriers is as large as several thousand, so having a very large PAPR is a problem.
  • FIG. 32 shows a functional block diagram showing the configuration of a conventional OFDMZxDSL transmitter using a phase rotation sequence.
  • the phase rotation sequence selection unit 820 reads the phase rotation amount (in this example, “0” or “ ⁇ ”) stored in the phase rotation sequence 810, and codes for specifying the phase rotation amount (Referred to as phase rotation sequence information) is sent to the S / P conversion unit 830 and the amount of phase rotation is sent to the phase rotation unit 840.
  • the S / P converter 830 converts the input data and phase rotation sequence information from a serial format to a parallel format (serial / parallel conversion). ) And put it on a predetermined number of subcarriers.
  • the parallelized data sequence is ⁇ d
  • the signal point of the data string is indicated by a black circle on the coordinate axis with the I channel component as the horizontal axis and the Q channel component as the vertical axis.
  • phase rotation unit 840 If the amount of phase rotation is ⁇ , 0, ⁇ , ⁇ as shown in the figure, the signal points after phase rotation are as shown. In other words, d rotates ⁇ (180 degrees) counterclockwise on the coordinate axis, and d
  • phase-rotated data sequence is subjected to Inverse Fast Fourier Transformation in IFFT section 850, and the frequency domain (amplitude vs. frequency) data is converted into a time domain (amplitude vs. time) signal. Converted to.
  • peak power measurement section 860 measures the peak power of the signal over one symbol of the OFDM signal, and notifies phase rotation sequence selection section 820 when the peak power is greater than a predetermined threshold.
  • the phase rotation sequence selection unit 820 is different from the previous time. Thereafter, the same processing as described above is repeated, and the data is sent to the S / P converter 830.
  • the peak power measurement unit 860 has measured the peak power to be equal to or less than a predetermined threshold
  • the signal received from the peak power measurement unit 860 is transmitted from the wireless transmission unit 870 via the antenna 880.
  • FIG. 33 is a functional block diagram showing a configuration of a conventional MC_CDMA transmission apparatus.
  • spreading section 915 — :! ⁇ M receives the channelization code from channelization code generation section 910 and spreads the data.
  • the channelization code is ⁇ 1,-1, 1, —1 ⁇ for the I channel and ⁇ 1, 1, —1, — 1 ⁇ for the Q channel. .
  • scramble information selection section 990 sends the scramble code multiplied by the data to S / P conversion section 940, and S / P conversion section 940 receives the multiplication received from scramble code multiplication section 930.
  • the subsequent data and the scrambling code received from scrambling information selection section 990 are placed on different subcarriers.
  • IFFT section 950 sends the signal after IFFT is applied to the received data to peak power measurement section 960. This signal is, for example, as shown in (e).
  • Peak power measurement section 960 measures the peak power of the signal received from IFFT section 950, and if the peak power is greater than a predetermined threshold, scramble code generation section 925 To generate a scramble code different from the previous one. Thereafter, the scramble code multiplication unit 930 and the scramble information selection unit 990 repeat the same processing as described above, and send data to the S / P conversion unit 940. On the other hand, if the peak power measurement unit 960 has measured the peak power below a predetermined threshold, the signal received from the peak power measurement unit 960 is transmitted from the wireless transmission unit 970 via the antenna 980.
  • the FDM / xDSL transmission device described above has a phase rotation sequence 810 that stores the amount of phase rotation, and stores the amount of phase rotation as the number of subcarriers increases.
  • the amount of memory for doing so will also be enormous.
  • the transmitter using this phase rotation amount has a problem that there is a lot of redundancy.
  • the MC_CDMA transmission apparatus described above is configured to cyclically shift the scramble code, and therefore cannot be applied to other multicarrier systems such as the OFDM system.
  • Patent Document 1 Japanese Patent Laid-Open No. 2003-32220
  • the present invention has been made in view of the above problems, and can be applied to all multi-carrier modulation schemes including OFDM, xDSL and MC-CD MA schemes, and has a lot of redundancy. It is an object of the present invention to provide a transmission device, a reception device, a transmission / reception system, and a communication method that can reduce power during transmission without requiring a phase rotation sequence that requires a large amount of memory.
  • a transmission apparatus includes a parallelizing unit that converts input data into parallel symbols, an order changing unit that rearranges the order of the parallel symbols, and at least the order changing unit.
  • a conversion means for converting a data sequence including parallel symbols whose order is rearranged and generating a multicarrier modulation signal; and measuring a power of a predetermined format of the multicarrier modulation signal generated by the conversion means;
  • a power measuring means for determining whether or not the power is greater than a preset threshold; and when the power measuring means determines that the power is greater than the threshold, the order changing means is controlled to control the order Reordering the order of the parallel symbols, controlling the converting means to generate a multicarrier modulation signal from the parallel symbols, and the power measuring means
  • control means for controlling to measure the power of the predetermined format of the multicarrier modulation signal, Transmitting means for transmitting the multicarrier modulation signal when the power measuring means determines that the power is equal to or less than the threshold before the
  • a transmission apparatus includes a parallelizing unit that converts input data into parallel symbols, an order changing unit that rearranges the order of the parallel symbols, and at least the order changing unit.
  • the conversion means for converting the data sequence including the parallel symbols in which the order is rearranged to generate a multicarrier modulation signal, and the power of a predetermined format of the multicarrier modulation signal generated by the conversion means are measured, and the minimum Power measuring means for sequentially storing multi-carrier modulation signals having different powers, and controlling the order changing means to rearrange the order of the parallel symbols, and controlling the converting means to control multi-carriers from the parallel symbols.
  • Control means for generating a modulation signal and controlling the power measurement means to measure the power of the predetermined format of the multicarrier modulation signal When the series of processing by the control means reaches a predetermined number, characterized in that it comprises a transmitting means for transmitting the multicarrier modulated signal being remembers to the power measuring means.
  • a transmission apparatus includes a parallelizing unit that converts input data into parallel symbols, an order changing unit that rearranges the order of the parallel symbols, and at least the order changing unit.
  • Measure power of a predetermined format of the multicarrier modulation signal generated by the conversion means and select a set having a multicarrier modulation signal that minimizes the power measurement.
  • transmission means for transmitting a set of multicarrier modulation signals selected by the power measurement means.
  • a transmission apparatus includes a parallelizing unit that converts input data into parallel symbols, an order changing unit that rearranges the order of the parallel symbols, and an order by the order changing unit.
  • An inner product calculation means for calculating a numerical value corresponding to a predetermined form of power by taking an inner product of the parallel symbols in which the symbols are rearranged and a predetermined vector;
  • a power measuring means for determining whether or not the numerical value calculated by the calculating means is greater than a preset threshold; and when the calculated numerical value is determined to be greater than the threshold by the power measuring means,
  • the order changing means is controlled to rearrange the order of the parallel symbols again, and the inner product calculating means is controlled to take the inner product of the parallel symbols and the predetermined vector, corresponding to the power of the predetermined format.
  • the power measuring unit includes at least a symbol including a parallel symbol whose order is rearranged by the order changing unit. Converts the data ⁇ IJ, converting means for generating a multicarrier modulated signal, characterized in that it comprises a transmitting means for transmitting the multicarrier modulated signal made viable by the conversion means.
  • a transmission apparatus includes a parallelizing unit that converts input data into parallel symbols, an order changing unit that rearranges the order of the parallel symbols, and an order by the order changing unit.
  • the inner product calculating means for calculating a numerical value corresponding to power in a predetermined format by taking the inner product of the rearranged parallel symbol and a predetermined vector, and the numerical value calculated by the inner product calculating means is minimized.
  • Power measuring means for sequentially storing parallel symbols; and reordering the parallel symbols by controlling the order changing means; and controlling the inner product calculating means to control the inner of the parallel symbols and the predetermined vector.
  • Control to take a product, calculate a numerical value corresponding to the power of the predetermined format, and control the power measuring means to store the parallel symbol that minimizes the calculated numerical value And when a series of processing by the control means reaches a predetermined number of times, a data string including at least the parallel symbols stored by the power measuring means is converted, and a multicarrier modulation signal is converted. It is characterized by comprising conversion means for generating and transmission means for transmitting the multi-carrier modulation signal generated by the conversion means.
  • a transmission apparatus includes a plurality of sets of parallelizing means for converting input data into parallel symbols and order changing means for rearranging the order of the parallel symbols. And each of the order changing means performs rearrangement in a different order. At least one order changing means is provided, and the order is changed by the order changing means.
  • An inner product calculating means for calculating a numerical value corresponding to power in a predetermined format by taking an inner product of the parallel symbol replaced with a predetermined vector, and the smallest numerical value calculated by the inner product calculating means.
  • a power measuring means for determining the data a conversion means for converting the data string including the parallel symbol having at least the numerical value determined by the power measuring means to generate a multicarrier modulation signal, and the converting means Transmitting means for transmitting the multi-carrier modulated signal generated by the above.
  • the transmission auxiliary device can be connected to a transmission device including at least a network interface card, and can transmit a digital signal to the transmission device.
  • An order change means for rearranging the order of input data as serial symbol power, serial symbols whose order is rearranged by the order change means, and information on the rearrangement of the order performed by the order change means;
  • a synthesizing unit that generates a single data string, and a data sequence that is output when the data string synthesized by the synthesizing unit is received and input to the transmitting device including the network interface card.
  • Reproduction means for reproducing and outputting the carrier modulation signal; and a predetermined form of the multicarrier modulation signal output by the reproduction means.
  • Power measuring means for determining whether or not the power is greater than a preset threshold, and when the power measuring means determines that the power is greater than the threshold, the order The changing means is controlled to rearrange the order of the serial symbols, the converting means is controlled to generate a multicarrier modulation signal from the serial symbols, and the power measuring means is controlled to control the multicarrier modulation signal.
  • Control means for measuring the predetermined type of power, and when the power measurement means determines that the power is equal to or less than the threshold before the series of processing by the control means reaches a predetermined number of times.
  • Transmitting means for transmitting the data string generated by the synthesizing means as the digital signal to a transmitting device including the network interface card. And wherein the Rukoto.
  • a transmission auxiliary apparatus is a transmission auxiliary apparatus that can be connected to a transmission apparatus including at least a network interface card and can transmit a digital signal to the transmission apparatus.
  • Order changing means for rearranging the order of input data composed of serial symbols, and the serial symbols whose order has been rearranged by the order changing means And the information on the rearrangement of the order performed by the order changing means to generate one data string, the data string synthesized by the synthesizing means is received, and the data string is received by the network interface.
  • Reproducing means for reproducing and outputting a multicarrier modulation signal output when input to a transmitting device including a card, and measuring the power of a predetermined format of the multicarrier modulation signal output by the reproducing means,
  • the serial symbol is controlled by controlling the power measurement means for storing the data sequence that is the source of the multicarrier modulation signal in the combining means and the order changing means.
  • Reordering, and controlling the reproduction means to generate a multicarrier modulation signal from the serial symbol Control means for controlling the measurement means to measure the power of the predetermined format of the multi-carrier modulation signal, and stored in the synthesis means when a series of processing by the control means reaches a predetermined number of times.
  • a communication method includes a communication method in a transmission / reception system configured to receive at least one receiving apparatus that receives a multicarrier modulation signal transmitted from at least one transmitting apparatus.
  • the transmitting apparatus includes: a parallelizing step of converting input data into parallel symbols; an order changing step of rearranging the order of the parallel symbols; and a parallel whose order is rearranged by at least the order changing step.
  • the order of the parallel symbols is rearranged again, a multicarrier modulation signal is generated from the parallel symbols by the conversion step, and the power of the predetermined format of the multicarrier modulation signal is measured by the power measurement step.
  • the receiving device has the transmitting device power as well as the multicarrier.
  • Receiving the modulation signal, converting the multi-carrier modulation signal to generate a parallel 1J symbol, and rearranging the order performed by the order changing step from the parallel symbols generated by the inverse conversion step Based on the extraction process for extracting the information of the above and the rearrangement of the order extracted by the extraction process, the parallel symbol is subjected to the reverse process of the rearrangement performed by the order change process.
  • An order recovery step for generating the same parallel symbols as those converted by the parallelization step, and serialization for reconverting the parallel symbols generated by the order recovery step into data before conversion in the parallelization step And a process.
  • a communication method is a communication method in a transmission / reception system configured to receive at least one receiving device capable of receiving a multicarrier modulation signal transmitted from at least one transmitting device. Then, the transmitting apparatus includes a parallelizing step for converting input data into parallel symbols, an order changing step for rearranging the order of the parallel symbols, and information on the order rearrangement performed by the order changing step.
  • the order of the parallel symbols is rearranged again by the order changing step, a multi-carrier modulation signal is generated from the parallel symbols by the converting step, and the power measuring step
  • the inverse transform step of generating a parallel symbol converts the multi-carrier modulated signal, for each symbol of parallel symbols generated by the inverse conversion means
  • the symbol in which the information for identifying the rearrangement in the pilot insertion step is inserted is specified, and the symbol is determined from the position of the symbol.
  • the extraction step for extracting the information on the rearrangement of the order performed by the order changing step and the information on the rearrangement of the order extracted by the extraction step Based on the extraction step for extracting the information on the rearrangement of the order performed by the order changing step and the information on the rearrangement of the order extracted by the extraction step, the arrangement performed by the order changing step on the parallel symbols is performed.
  • An order recovery process that performs the reverse process and generates the same parallel symbols as those converted by the parallelization process, and the parallel symbols generated by the order recovery process before the conversion in the parallelization process.
  • a serialization process for re-converting the data is performed.
  • FIG. 1 is a schematic configuration diagram showing a multicarrier modulation signal transmission / reception system according to an embodiment of the present invention.
  • FIG. 2 is a functional block diagram showing a configuration of a transmission apparatus according to Embodiment 1 of the present invention.
  • FIG. 3 is a schematic diagram for explaining a function of a shift register used as a mapper in the embodiment of the present invention.
  • FIG. 4 is a flowchart showing the flow of processing performed by the OFDMZxDSL transmission apparatus shown in FIG.
  • FIG. 5 is a flowchart showing in detail the flow of processing in step S102 of FIG.
  • FIG. 6 is a functional block diagram showing the configuration of the receiving apparatus according to Embodiment 1 of the present invention.
  • FIG. 7 is a flowchart showing the flow of processing performed by the OFDM / xDSL receiver shown in FIG.
  • FIG. 8 is a functional block diagram showing a configuration of a transmission apparatus according to Embodiment 2 of the present invention.
  • FIG. 9 is a flowchart showing a flow of processing performed by the OFDM / xDSL transmission apparatus shown in FIG.
  • FIG. 10 is a functional block diagram showing the configuration of the transmitting apparatus according to Embodiment 3 of the present invention.
  • FIG. 11 is a functional block diagram showing the configuration of the receiving apparatus according to Embodiment 3 of the present invention.
  • FIG. 12 is a flowchart showing a flow of processing performed by the OFDM / xDSL transmission apparatus shown in FIG.
  • FIG. 13 is a flowchart showing the flow of processing performed by the OFDM / xDSL receiver shown in FIG.
  • FIG. 14 is a schematic diagram showing pilot insertion performed by the pilot insertion unit 135.
  • FIG. 14 is a schematic diagram showing pilot insertion performed by the pilot insertion unit 135.
  • FIG. 15 is a functional block diagram showing the configuration of the transmitting apparatus according to Embodiment 4 of the present invention.
  • FIG. 16 is a flowchart showing the flow of processing performed by the MC-CDMA transmission apparatus shown in FIG.
  • FIG. 17 is a functional block diagram showing the configuration of the receiving apparatus according to Embodiment 4 of the present invention.
  • FIG. 18 is a flowchart showing a flow of processing performed by the receiving apparatus shown in FIG. 17.
  • FIG. 19 shows a case where the number of subcarriers is changed in the transmitting apparatus according to Embodiment 4 of the present invention. It is a figure which shows a PAPR characteristic.
  • FIG. 20 is a functional block diagram showing the configuration of the transmission apparatus according to Embodiment 4 of the present invention.
  • FIG. 21 is a functional block diagram showing the configuration of the transmitting apparatus according to Embodiment 4 of the present invention.
  • FIG. 22 is a schematic diagram showing (a) a transmission unit and (b) a reception unit of a normal wireless LAN.
  • FIG. 23 is a schematic diagram showing (a) a transmission unit and (b) a reception unit of a wireless LAN according to Embodiment 5 of the present invention.
  • FIG. 24 is a diagram showing PAPR characteristics when the transmitter according to Embodiment 5 of the present invention is used, the number of interleavers provided in the mapper unit, and the number of conventional phase rotation sequences are changed.
  • FIG. 25 is a diagram showing out-of-band radiation characteristics when the transmitting unit according to Embodiment 5 of the present invention is used.
  • FIG. 26 is a schematic diagram for explaining the function of an interleaver used as a mapper.
  • FIG. 27 is a schematic diagram showing one embodiment of a pseudorandom number generating means provided in the interleaver.
  • FIG. 28 is a schematic diagram for explaining the function of a block interleaver used as a mapper.
  • FIG. 29 is a schematic diagram for explaining excess power.
  • FIG. 30 is a schematic diagram showing a configuration of a mapper section provided with a plurality of mappers.
  • FIG. 31 is a functional block diagram showing a configuration of a transmission apparatus according to a modification of the present invention.
  • FIG. 32 is a functional block diagram showing the configuration of a conventional OFDM / xDSL transmission apparatus using a phase rotation sequence.
  • FIG. 33 is a functional block diagram showing a configuration of a conventional MC-CDMA transmission device.
  • OFDM / xDSL and downlink MC-CDMA will be described with reference to the drawings as an example of a multicarrier modulation signal transmission / reception system.
  • FIG. 1 is a schematic configuration diagram showing a multicarrier modulation signal transmission / reception system (hereinafter also referred to as a transmission / reception system as appropriate) according to an embodiment of the present invention.
  • the transmission / reception system includes at least one base station (transmitting device) 10 and at least one mobile phone (receiving device) 20.
  • Radio waves transmitted from the base station 10 are encoded so that the peak power value is low, and the mobile phone 20 that has received the radio waves decodes and displays the data transmitted from the base station 10 as character data. Or send as audio data Is possible.
  • Fig. 1 the mode in which the mobile phone 20 receives the signal transmitted from the base station 10 has been described, but the embodiment according to the present invention is not limited thereto, and for example, by wireless LAN,
  • a plurality of user terminals may be configured to transmit and receive signals to each other, or may be configured to transmit and receive signals between at least one user terminal and an access point.
  • wireless communication methods such as FWA (Fixed Wireless Access) and UWB (Ultra Wide Band)
  • signals are transmitted and received between the base station and at least one user terminal.
  • ADSL Asymmetric Digital
  • a signal may be transmitted and received between the telephone station and the user terminal.
  • FIG. 2 is a functional block diagram showing the configuration of the transmission apparatus according to Embodiment 1 of the present invention.
  • the transmitter 10 includes a mapper selection unit 110, an S / P conversion unit (parallelization unit) 120, a mapa unit (order change unit) 130, an IFFT unit (conversion unit) 140, a peak power measurement unit (power measurement unit) 15 0, a radio transmission unit (transmission means) 160, and an antenna 170.
  • the transmission device and the reception device are provided with a control unit (control means) (not shown), and the control unit controls each functional unit. Perform the desired function.
  • the control unit controls the mapper unit 130 to generate parallel symbols. The order is rearranged, IFFT section 140 is controlled to generate a multicarrier modulation signal from the parallel symbol, and peak power measurement section 150 is controlled to measure the power of the predetermined format of the multicarrier modulation signal. Make it.
  • the mapper selection unit 110 selects which mapper among the mappers provided in the mapper unit 130. Whether the input data is to be processed, and the mapper information ⁇ i ⁇ representing the selected mapper is transmitted to the IFFT section 140 as side information. Further, the mapper selection unit 110, when the value of ⁇ i ⁇ exceeds the maximum number of mappers prepared in the mapper unit 130 (hereinafter referred to as “i” max ⁇ ), the peak power measurement unit 150 And send the signal with the lowest peak power in the process up to that point.
  • SZP conversion section 120 converts input data from a serial (serial) format to a parallel (parallel) format, and places the data (parallel symbol) on a predetermined subcarrier.
  • the mapper unit 130 includes a plurality of mappers, and performs mapping using the mapper selected by the mapper selection unit 110 on the parallel symbols received by the S / P conversion unit 120. Sort by.
  • the mapper is, for example, a shift register.
  • FIG. 3 is a schematic diagram for explaining the function of the shift register used as a mapper in the embodiment of the present invention.
  • parallel data is input in S / P converter 120.
  • Input data parallel symbols
  • ⁇ d, d, d, ..., d ⁇ for one symbol of the parallelized OFDM signal is
  • ⁇ m ⁇ is shifted. That is, when m is smaller than N, as shown in Fig. 3, the position of input data d is replaced with data d, and the position of input data d is replaced with data d.
  • IFFT section 140 combines the parallel symbol received from mapper section 130 and the mapper information received by mapper selection section 110 into one data string, performs IFFT on the data string, and performs frequency domain (amplitude vs frequency). Data is converted to a multi-carrier modulation signal in the time domain (amplitude vs. time). In this way, since data is spread in the frequency direction, the OFDM and MC-CDMA systems are frequency spread, and a frequency diversity effect can be obtained.
  • the mapper information is inserted into a predetermined subcarrier.
  • This mapper information is information indicating the selected mapper. For example, when the tenth matuba is used, data corresponding to “10” is inserted into a predetermined subcarrier.
  • the peak power measurement unit 150 stores a predetermined threshold, and the peak power, which is an instantaneous value (square of amplitude) of power at each time, of the time domain signal received from the IFFT unit 140 is stored. When the measured peak power is larger than the stored threshold value, the fact is notified to the mapper selection unit 110.
  • the peak power measurement unit 150 stores the signal in the peak power measurement unit 150.
  • the signal is transmitted to the wireless transmission unit 160.
  • Radio transmission section 160 transmits the signal received from peak power measurement section 150 via antenna 170.
  • FIG. 4 is a flowchart showing the flow of processing performed by the O FDM / xDSL transmission apparatus shown in FIG.
  • the QPSK method is a method of transmitting by changing the phases of two carriers that are 90 degrees out of phase according to the input data and combining them.
  • QAM Quadrature Amplitude Modulation
  • This QAM includes, for example, 16QAM that transmits signals by changing the carrier to 16 different states with different amplitudes and phases, and 64QAM that transmits signals by changing to 64 different states.
  • the QPSK system is equivalent to 4QAM.
  • input data is separated into an I channel (in-phase component) and a Q channel (quadrature component) by an IQ separator (splitter) (not shown).
  • I channel in-phase component
  • Q channel quadrature component
  • the carrier phase is shifted by 90 degrees.
  • the S / P converter 120 converts the data into a parallel format (step S101).
  • Figure 2 shows.
  • the signal point of the data is indicated by a black circle on the coordinate axis with the I channel component as the horizontal axis and the Q channel component as the vertical axis.
  • the transmitting apparatus maps the parallel symbols by a mapper, captures the mapper information, converts it to a multicarrier modulation signal, and a signal having a low peak power among the signals.
  • the mapper information is information such as the number of shifts when a shift register is used as the mapper, for example.
  • FIG. 5 is a flowchart showing in detail the process flow in step S102.
  • the mapping performed by the mapper unit may be the same or different between the I channel and the Q channel.
  • the mapping is different between the I channel and the Q channel, it is preferable because the effect of reducing the peak power described later becomes larger.
  • mapa ⁇ 1 ⁇ means that when the mapper unit 130 uses a shift register, for example, the shift number is “1”.
  • the signal points after the shift when this shift number is “1” are shown in FIG.
  • the input data ⁇ d, d, d, ..., d ⁇ is
  • IFFT section 140 receives the data subjected to the mapping of the mapper section 130, combines it with the mapper information received from mapper selection section 110, and performs IFFT on the data string. (Step S203). As a result, I-channel and Q-channel signal waveforms as shown in FIG. 2 are obtained. Then, the peak power measurement unit 150 measures the peak power at each time of the signal (step S204). As a result, if the peak power of the signal is equal to or lower than the predetermined threshold (No in step S205), the signal is transmitted via the antenna 170 (step S206). If there is next data to be transmitted (Yes in step S212), the process returns to step S201 and the subsequent processing is continued.
  • step S207 determines that the peak power is the smallest measured up to now for the signal. Is determined (step S207). In this case, the peak power is determined to be minimum (step S207) because it is still the first time that step S207 has been reached. In step S207, Yes), it is overwritten and stored in a predetermined area in the peak power measurement unit 150 (step S208).
  • the peak power measurement unit 150 notifies the mapper selection unit 110 to select the next mapper.
  • step S210 if it is determined in step S210 that the value of ⁇ i ⁇ exceeds Umax ⁇ (Yes in step S210), the peak power measurement unit 150 stores the stored signal, that is, up to this point. Then, the signal having the minimum peak power is transmitted to the wireless transmission unit 160, and the wireless transmission unit 160 transmits the signal via the antenna 170 (step S211). If there is next data to be transmitted (Yes in step S212), the process returns to step S201, and the subsequent processing is continued.
  • FIG. 6 is a functional block diagram showing the configuration of the receiving apparatus according to Embodiment 1 of the present invention
  • FIG. 7 is a flowchart showing the flow of processing performed by the OFDM / xDSL receiving apparatus shown in FIG. .
  • the receiving device 20 includes an antenna 210, a radio receiving unit 220, an FFT unit (inverse conversion unit) 230, a mapper information extraction unit (extraction unit) 240, a demapper unit (order recovery unit) 250, and a P / S conversion unit (serialization).
  • Means) 260 is configured.
  • the antenna 210 receives a signal transmitted from the transmission device 10 (step S301)
  • the signal is transmitted to the FFT unit 230 via the wireless reception unit 220.
  • the FFT unit 230 performs fast Fourier transformation on the signal received from the radio reception unit 220, and converts the time domain (amplitude vs. time) signal into frequency domain (amplitude vs. frequency) data (Ste S302).
  • the mapper information extraction unit 240 extracts the mapper information from the data decomposed into each subcarrier by the FFT unit 240 (step S303), and sends it to the demapper unit 250.
  • the demapper unit 250 includes a plurality of mappers that are the same as those provided in the transmission device 10, and is used in the mapper unit 130 based on the mapper information received from the mapper information extraction unit 240.
  • the mapper is identified and the process (demapping) reverse to the mapper is performed (step S304). This is because, for example, when the mapper provided in the mapper unit 130 is a shift register, and the number of shifts is “1” as shown in FIG. Corresponds to shifting by “1”.
  • the PZS conversion unit 260 converts the parallel format data received from the demapper unit 250 into the serial format (step S305). If there is next data to be continuously received (Yes in step S 306), the process returns to step S 301 and the subsequent processing is continued.
  • the present invention is applicable to all multicarrier modulation schemes, and it is not necessary to use a phase rotation sequence that requires a large amount of memory. Since parallel symbols are rearranged before conversion by, power can be effectively reduced.
  • a multicarrier modulation signal is transmitted as soon as the power falls below the threshold, processing can be performed at high speed.
  • the power can be reduced more reliably.
  • the input data is mapped in the mapper unit 130, and the mapper selection process is continuously performed so that the peak power of the mapped data is reduced.
  • the peak power measurement unit 150a, and the wireless transmission unit 160 have functions as a parallelization unit, a sequence change unit, a conversion unit, a power measurement unit, and a transmission unit, respectively.
  • FIG. 8 is a functional block diagram showing the configuration of the transmission apparatus according to Embodiment 2 of the present invention.
  • the number of mappers included in the mapper unit 130 (hereinafter, the number is referred to as M) is parallel. There is only one Matsupa in each of the Matsupa parts 130-1 to M. Suppose that For example, when a shift register is used as the mapper, the mapper unit 1301 has a shift number “1”, and the mapper unit 130-M has a shift number “M”.
  • the S / P converters 120_1 to M and the IFFT units 140_1 to M perform the same functions as the SZP converter 120 and the IFFT unit 140 of the first embodiment.
  • the mapper numbers (“1” to “! L”) are input to the IFFT units 140_1 to M as mapper information.
  • the peak power measurement unit 150a measures the peak power of the signals input in parallel from the IFFT units 140-1 to M, and transmits only the signal having the lowest peak power through the wireless transmission unit 160.
  • FIG. 9 is a flowchart showing the flow of processing performed by the O FDM / xDSL transmission apparatus shown in FIG.
  • the S / P converters 120_1 to M convert serial data into parallel symbols (step S351).
  • the mapper units 130_1 to M perform mapping to the parallel symbols (step S352), and send the IFFT units 140-1 to 140-M.
  • the IFFT unit 140-:!-M that has received the parallel symbol for the parallel symbol 130—:! To M applies IFFT to the data string in which the parallel symbol and the mapper information are combined into one (SFP Step S353), and M signals are sent to the peak power measurement unit 150a.
  • the peak power measurement unit 150a receives signals mapped using the mappers ⁇ 1 ⁇ to ⁇ M ⁇ from the IFFT units 140-1 to M, the peak power measurement unit 150a measures the peak power of these signals (steps). S354). At this time, the peak power of M signals may be measured in parallel by providing a plurality of CPUs, or may be sequentially performed by one CPU.
  • the peak power measurement unit 150a As a result of the measurement by the peak power measurement unit 150a, when a signal that minimizes the peak power (in the example shown in Fig. 8, a signal using the mapa ⁇ 2 ⁇ ) is obtained, the signal is measured by measuring the peak power. After being transmitted from unit 150 a to radio transmission unit 160, it is transmitted through antenna 170.
  • the receiving apparatus As a receiving apparatus corresponding to the case where the transmitting apparatus according to the present embodiment is used, the receiving apparatus (see FIG. 6) according to the first embodiment described above can be used. Omitted.
  • the present invention can be applied to all multicarrier modulation schemes, and it is not necessary to use a phase rotation sequence that requires a large amount of memory. Since the parallel symbols are rearranged before the conversion by the conversion means, the power can be effectively reduced. In addition, processing from parallelization of input data to power measurement can be performed in parallel, enabling high-speed processing.
  • FIG. 10 is a functional block diagram showing the configuration of the transmission apparatus according to Embodiment 3 of the present invention.
  • FIG. 11 is a functional block diagram showing the configuration of the reception apparatus according to Embodiment 3 of the present invention.
  • FIGS. 10 and 11 show a mode in which the mapper selection process is continuously performed so that the peak power of the mapped data becomes small as shown in FIG. Then, in the transmitting apparatus according to the present embodiment, in addition to the transmitting apparatus in the first embodiment (see FIG. 2), instead of inserting the mapper information into the S / P conversion unit 121, the mapper information is newly transmitted.
  • the pilot insertion unit (pilot insertion means) 135 is provided, and the mapper selection unit 111 is configured to send mapper information to the pilot insertion unit 135.
  • the subcarrier for specifying the subcarrier in which the pilot is inserted in pilot insertion section 135 is provided.
  • the power measuring unit (individual power measuring means) 235 is further provided. This subcarrier power measurement unit 235 is configured to obtain the power of each subcarrier over one symbol of the OFDM signal.
  • the mapper information extraction unit 241 is configured to receive the mapper information from the subcarrier power measurement unit 235 that is not from the P / S conversion unit 260 and to notify the dematsuba unit 250.
  • FIG. 12 and FIG. 13 show the OFDMZxDSL transmission apparatus and diagram shown in FIG. 2, respectively.
  • FIG. 7 is a flowchart showing the flow of processing performed by the FDM / xDSL receiver shown in FIG. Since the flow of transmission and reception processing in this embodiment is almost the same as in the first embodiment, detailed description thereof is omitted. The difference is that pilot insertion performed by pilot insertion unit 135 during transmission (step S251 in FIG. 12) and subcarrier during reception. A process (step S311 in FIG. 13) for identifying the subcarrier in which the pilot is inserted and extracting the mapper information performed by the power measurement unit 235 is newly added.
  • FIG. 14 is a schematic diagram showing pilot insertion performed by the pilot insertion unit 135.
  • Figure 14 (a) shows one subcarrier before pilot insertion, (b) shows one subcarrier after pilot insertion, and C, C, etc. represent one data.
  • the pilot insertion part 135 has the force of the Matsupa part 130 as shown in Fig. 14 (a).
  • the subcarriers inserted by the pilot insertion unit 135 indicate the number of the mapper used in the mapper unit 130, that is, the mapper information. For example, when a shift register is used in the mapper unit 130 and the shift number is “2”, the pilot insertion unit 135 inserts a pilot into the second subcarrier. Thereafter, IFFT section 140 transmits the signal from multicarrier modulation signal power antenna 170 to which IFFT has been applied.
  • the receiving device that has received the signal measures the power of each subcarrier in subcarrier power measurement section 235 and identifies the subcarrier in which the pilot (“0”) is embedded. This can be determined, for example, because the power of a subcarrier to which “0” is input is smaller than the power of other subcarriers.
  • the mapper information extraction unit 241 notifies the demapper unit 250 of the number of the subcarrier received from the subcarrier power measurement unit 235, and causes the demapper corresponding to the number to be executed. As a result, the data input to the transmission device 10 is reproduced.
  • pilot insertion unit 135 inserts “0”, the power of the subcarrier in which “0” is inserted is smaller than the power of other subcarriers. Therefore, it is possible to specify the rearrangement by measuring the power of the subcarrier, and to do so. It is easy to identify when hitting.
  • Embodiments 1 to 3 described above the case where a functional unit for reducing peak power is provided in OFDM / xDSL has been described. However, in the present embodiment and the following embodiments, the present invention is applied to MC-CDMA. A form is demonstrated.
  • the spreading units 315_1 to M, the data multiplexing unit 320, the scramble code generation unit 325, the scramble code multiplication unit 330, and the SZP conversion unit 340 have a function as parallelization means. .
  • FIG. 15 is a functional block diagram showing the configuration of the transmission apparatus according to Embodiment 4 of the present invention.
  • the transmission apparatus according to the present embodiment does not include the scramble information selection unit 990.
  • the pilot insertion unit (pilot insertion means) 365 is used to insert the mapper information used in the mapper unit 360 into the data. That is, in the conventional transmission apparatus, the power that was configured to reduce the peak power by cyclically shifting the scramble code, for example, in this embodiment, the scramble code is normally multiplied, and the mapper unit 360 performs data mapping. To do is different.
  • FIG. 16 is a flowchart showing the flow of processing performed by the MC-CDMA transmission apparatus shown in FIG.
  • channelization code generation section 310 generates a channelization code (step S401).
  • This channelization code may be generated whenever data is input, or stored in a ROM (Read Only Memory) or the like and read from the ROM or the like as required when data is input. Also good.
  • spreading sections 315_1 to M receive channelization codes from channelization code generation section 310 and perform data spreading (step S402). ).
  • the data spread in spreading sections 315-1 to M is subsequently multiplexed in data multiplexing section 320 (step S403).
  • the scramble code generation unit 325 multiplies the scramble code generated by the data multiplexing unit 320 by the scramble code multiplication unit 330 (step S404).
  • the S / P converter 340 receives from the scramble code multiplier 330.
  • the data after multiplication is converted from serial format to parallel format and output to the mapper unit 360 (step S405).
  • step S406 The flow of processing (step S406) for mapping the subsequent data, inserting the used mapper information as a pilot, and transmitting a signal with low peak power (step S406) is the same as that in FIG. Is omitted.
  • FIG. 17 is a functional block diagram showing the configuration of the receiving apparatus according to Embodiment 4 of the present invention.
  • FIG. 18 is a flowchart showing the flow of processing performed by the receiving apparatus shown in FIG.
  • the receiving apparatus according to the present embodiment is configured to include a despreading section 270 in addition to the OFDMZxDSL receiving apparatus shown in FIG. Therefore, in step S312 in FIG. 18, the only difference is that a process for despreading the demapped data is newly added, and the description thereof will be omitted.
  • FIG. 19 is a diagram showing PAPR characteristics when the number of subcarriers is changed in the transmission apparatus according to Embodiment 4 of the present invention.
  • the horizontal axis of this figure is the PAPR value, which is the peak power divided by the average power. In other words, for example, 10 [dB] on the horizontal axis indicates that the peak power is 10 times the average power.
  • the vertical axis in this figure represents the probability that the peak power exceeds the corresponding PAPR value on the horizontal axis.
  • the number of users is “16”
  • the spreading factor is “32”
  • the number of subcarriers is “3/4” of the number of FFT points.
  • Nc represents the number of subcarriers. That is, in the present embodiment, the results are shown when 384, 192, and 96 subcarriers are used. Also, the dotted line is the result when using a conventional method that does not include a phase rotation sequence or the like, and the solid line is the result according to the embodiment of the present invention. As can be seen from this figure, in both the conventional case and the present embodiment, when the number of subcarriers increases, the shift to the right side of the figure, that is, the peak power increases. As mentioned earlier, this is a common issue for PAPR.
  • the transmission device in the present embodiment described above is configured such that the S / P conversion unit 340 is disposed immediately before the mapper unit 360, but the embodiment of the present invention is not limited thereto, and the S / P conversion unit 340
  • a configuration may be employed in which the spreading sections 315-1 to M are provided, and the outputs from the spreading sections 315_1 to M are already parallelized to a number corresponding to the number of subcarriers. ,. In that case, it is not necessary to provide the SZP converter 340 at the position shown in FIG.
  • the transmission apparatus performs mapping in the mapper unit 360 after being multiplied by the scramble code multiplication unit 330 and before being input to the IFFT unit 370 as shown in FIG.
  • the embodiment of the present invention is not limited thereto.
  • spreading is performed immediately before the scramble code multiplier 330 multiplies the scramble code as shown in FIG. 20 or after the channelization code generator 310 sends the channelization code as shown in FIG. It may be configured to have a mapa unit 360 immediately before being diffused in the unit.
  • the mapper is configured to map from the serial format to the serial format, rather than mapping from the parallel format to the parallel format, it should be configured.
  • the transmission device includes a mapper unit
  • the reception device includes a demapper unit
  • a signal with low peak power is transmitted and received by changing the mapping in the mapper unit. It was.
  • a mapper unit into hardware such as a wireless LAN card. Therefore, in this embodiment, by providing a functional unit having a mapping or demapping function outside the hardware of a wireless LAN card, which is an example of a network interface card (NIC), the peak power can be reduced.
  • NIC network interface card
  • FIG. 22 is a schematic diagram showing (a) a transmission unit and (b) a reception unit of a normal wireless LAN.
  • input data is subjected to error correction, packet and data consistency check, etc. in the transport layer.
  • destination address and own information header information such as an address
  • IFFT is applied to the data in the wireless LAN card and sent as a transmission signal.
  • the receiving unit in FIG. 22 (b) that has received the transmission signal, the data is subjected to FFT or the like in the wireless LAN card and then decoded as input data.
  • FIG. 23 is a schematic diagram showing (a) a transmission unit and (b) a reception unit of the wireless LAN according to the embodiment of the present invention.
  • the transmission side mapper unit 400 transmission unit
  • the transmission side mapper unit 400 is externally connected to a wireless LAN mode or the like and enables transmission / reception of signals with low peak power.
  • Auxiliary device and a receiving-side dematsuba unit (reception auxiliary device) 500 are provided.
  • the transmission-side mapper unit 400 includes a mapper selection unit 410, a mapper unit (order changing unit) 420, a lower layer emulation unit (reproduction unit) 430, a peak power measurement unit (power measurement unit) 440, and a data synthesis unit (synthesis) Means and transmission means) 450.
  • the data input to the transmission side mapper unit 400 is sent to the mapper unit 420, where mapping by the mapper selected by the mapper selection unit 410 is performed. This mapping rearranges the order of input data, which is a serial symbol.
  • the data mapped in the mapper unit 420 and the mapper information indicating the mapper used in the mapper unit 420 are sent to the data combining unit 450 and combined into one data string.
  • the data sequence synthesized in data synthesis unit 450 is sent to lower layer emulation unit 430, where the same processing as that performed in the transport layer, the Internet layer, and the wireless LAN card is performed.
  • the processed signal is sent to the peak power measurement unit 440.
  • lower layer emulation unit 430 adds header information added in the Internet layer to the data string received from data synthesizer 450, or IFFT performed in the wireless LAN card as a data string. It is a functional part to give. That is, the lower layer emulation unit 430 is a functional unit that faithfully reproduces a signal waveform when the data string transmitted from the data synthesis unit 450 is input to the transport layer and transmitted from the wireless LAN card. Therefore, reducing the peak power of the signal transmitted from the lower layer emulation unit 430 is equivalent to actually reducing the peak power of the signal transmitted from the transmission unit in FIG.
  • the peak power measurement unit 440 is provided, and the peak power is minimized as in the above embodiments:! To 4.
  • the mapa selection process is performed.
  • the data string (data and mapper information) determined to have the minimum peak power is input from the data synthesis unit 450 to the transport layer and transmitted from the wireless LAN card.
  • the peak power measurement unit 440 stores a predetermined threshold value and the peak power of the multicarrier modulation signal transmitted from the lower layer emulation unit 430 is equal to or lower than the threshold value
  • the data string that is the source of the carrier modulation signal is transmitted to the data synthesizing unit 450 and the transmission device including the wireless LAN card.
  • the peak power measurement unit 440 receives the multicarrier modulation signal, measures the power, compares the power with the minimum power so far, and compares the multicarrier modulation signal having the minimum power.
  • the original data string may be overwritten and stored in the data composition unit 450 sequentially. In this case, when a predetermined number of times (for example, Umax ⁇ in the first embodiment) is reached, the data string stored in the data composition unit 450 is transmitted to the transmission device including the wireless LAN card.
  • the receiving-side demapper unit 500 shown in FIG. 23 (b) includes a demapper selection unit 510, a demapper unit (order recovery unit) 520, and a data separation unit (separation unit) 530.
  • the receiving unit in Fig. 23 (b) receives the signal transmitted from the transmitting unit shown in Fig. 23 (a), the signal is subjected to FFT in the wireless LAN card, and then the Internet layer and the transport layer. And is input to the receiving side demapper unit 500 as a data string (data and mapper information).
  • the data string input to receiving side dematsuba section 500 is first separated into data output from mapper section 420 and mapper information in data separation section 530. Then, the data is sent to the demapper unit 520, and the mapper information is sent to the demapper selection unit 510. Upon receiving the mapper information from the data separation unit 530, the demapper selection unit 510 selects a demapper for returning (demapping) the mapper used in the mapper unit 420, and the demapper unit 520 selects the demapper. Demapping is performed using the dematsuba. The data decrypted by the above processing is sent out from the receiving dematsuba unit 500 and the processing ends. To do.
  • FIG. 24 shows a case where the transmission unit according to this embodiment is used and the number of interleavers as one form of the mapper included in the mapper unit is changed, and a conventional phase rotation sequence is used as the mapper included in the mapper unit.
  • FIG. 6 is a diagram showing PAPR characteristics when the number of phase rotation series used is changed.
  • the horizontal axis of this figure is the PAPR value, which is the peak power divided by the average power.
  • the vertical axis in this figure represents the probability that the peak power exceeds the corresponding PAPR value on the horizontal axis.
  • the parameters used are in accordance with the standard of the wireless LAN standard IEEE802.1 la and assume the OFDM method.
  • N is the number of interleavers provided in the mapper unit 420
  • M is the phase rotation sequence.
  • results are shown when 1, 2, 4, 8, or 16 interleavers or phase rotation sequences are used.
  • a line to which a symbol such as “ki” (black circle) is added is the result according to the embodiment of the present invention, and the symbol is added to the line and the line uses the conventional phase rotation sequence. It is a result.
  • the predetermined threshold stored in the peak power measurement unit 440 is 7 [dB]. That is, in the present embodiment, when the peak power of the multicarrier modulation signal transmitted from the lower layer emulation unit 430 becomes 7 [dB] or less, the data string that is the source of the multicarrier modulation signal is Data is sent from the data synthesizer 450 to the transmitter including the wireless LAN card.
  • the transmission unit according to the present embodiment shows PAPR characteristics equivalent to those of the conventional method.
  • the conventional method using a phase rotation sequence requires complex multiplication, but according to the present invention, complex multiplication is not required. Therefore, according to the present invention, it is possible to further reduce the complexity of calculation while keeping the PAPR value suppressed as in the conventional method.
  • FIG. 25 is a diagram showing out-of-band radiation characteristics when the transmission unit according to this embodiment is used.
  • the horizontal axis of this figure is the frequency of input data (in [MHz] units), and the vertical axis is the relative spectral power density (in [dB] units).
  • the parameters used are in accordance with the standard of the wireless LAN standard IEEE802.1 la and assume the OFDM method.
  • N represents the number of interleavers provided in the mapper unit 420
  • IBO non-interval. Input backoff to the linear amplifier.
  • the curve indicated as the spectrum mask represents the upper limit of the relative spectral power density defined in the IEEE 802.1 la standard. In other words, products that comply with the IEEE802.11a standard must have the relative spectral power density below the spectral mask (the smaller value) in all frequency regions.
  • the curve labeled linear amplifier shows the result when the power input to the amplifier is input without being cut.
  • the number of interleavers (N) is two or four.
  • the present invention is applicable to all multicarrier modulation schemes, and it is not necessary to use a phase rotation sequence that requires a large amount of memory. Since parallel symbols are rearranged before conversion to a modulated signal, power can be effectively reduced. In addition, when a multi-carrier modulation signal is transmitted immediately when the power falls below a threshold, processing can be performed at high speed. In contrast, when transmitting a multi-carrier modulation signal having the minimum power until the predetermined number of times is reached, the power can be more reliably reduced. In addition, since the waveform output from the wireless LAN card is faithfully reproduced, the power of the transmission signal can be reliably reduced.
  • the shift register is mainly used as the mapper included in the mapper unit 130.
  • the embodiment of the present invention is not limited to this, and for example, the following interleaver and block interface are used. It is possible to use a Lever or the like.
  • FIG. 26 is a schematic diagram for explaining the function of an interleaver used as a mapper. Input data parallelized in S / P converter (d
  • the pseudo-random numbers generated by the pseudo-random number generator provided in the tareeber are output in the order of the pseudo-random numbers generated.
  • FIG. 27 is a schematic diagram showing an embodiment of the pseudorandom number generating means provided in the interleaver.
  • a primitive polynomial h (x) is prepared, and a shift register that performs processing according to the polynomial is configured.
  • N the number to be input
  • the degree D of the primitive polynomial is determined as satisfying N ⁇ 2 D — 1.
  • N 6
  • D should be an integer greater than 3.
  • the advantage of using the interleaver as described above when rearranging data and subcarriers is that, for example, less storage capacity is required compared to a method such as the linear congruence method.
  • the linear congruence method needs to use 32-bit integers and add or multiply the integers.
  • an interleaver if the state is expressed by 5 bits and the number of connections is 5, the storage capacity of about log31 can be obtained using a logarithmic function (log) with 2 as the base. I just need it.
  • FIG. 28 is a schematic diagram for explaining the function of a block interleaver used as a mapper.
  • the input data for one symbol of the OFDM signal is written to the memory in the direction depicted by the dotted arrow in the figure (the direction that is directed downward from the top of the figure).
  • data is output, it is read out from the memory in the direction drawn by the solid arrows in the figure (the direction from the left to the right in the figure).
  • the output data ⁇ d, d, d, ..., d, d ⁇
  • the shift register shown in FIG. 3, the interleaver shown in FIG. 26, the block interleaver shown in FIG. 28, etc. eventually obtain and output various permutations of the input number sequence. It is common in that it has a function. Therefore, it is possible to configure a general-purpose mapper that has all the functions of the above mapper. Further, the mapper according to the embodiment of the present invention may be configured by hardware, for example, by software having a function of obtaining a permutation of input data by a CPU or the like and outputting the result. May be.
  • the peak power measurement unit obtains the instantaneous value of the peak power and transmits the signal having the minimum value.
  • the embodiment of the present invention is not limited thereto.
  • the peak power measuring unit 150 may be configured to calculate excess power.
  • FIG. 29 is a schematic diagram for explaining excess power.
  • the vertical axis in the figure is instantaneous power, and the horizontal axis is time.
  • the figure also shows a waveform for one symbol.
  • excess power is the sum of power of signal components that are equal to or greater than average power x [dB].
  • This X may be selected so as to correctly reflect the sum of the power of the excess power symbol. For example, a value of about 3 [dB] is selected. In this way, excess power is targeted for the sum of power, which is effective in reducing transmission power.
  • FIG. 30 is a schematic diagram showing a configuration of a mapper section provided with a plurality of mappers.
  • the mapper unit includes, for example, a shift register 362, an interleaver 364, a block interleaver 366, and the like.
  • the mapper unit switches the two-contact switch to the mapper selected by the mapper selection unit, and maps the data using the selected mapper. Therefore, the Matsupa selection unit sends As the mapper information to be performed, in addition to which mapper is selected, for example, when a shift register is selected, the number of shifts may be included.
  • the peak power of the signal subjected to IFFT is measured by the IFFT unit and, for example, the mapper having the smallest peak power is selected.
  • Embodiments of the invention are not limited thereto.
  • a predetermined vector is used before IFFT is performed in the I FFT unit 142, and the inner product of the vector and the parallel symbol input to the IFFT unit is calculated.
  • An inner product operation unit (inner product operation means) 180 for obtaining a numerical value may be provided.
  • the power measuring unit (power measuring means) 152 selects a mapper having the smallest value corresponding to the peak power.
  • the predetermined vector uses a learning algorithm such as SVM (Support Vector Machine) or a genetic algorithm to perform pre-learning on almost random data, etc., and the peak power after inner product calculation is small. You can gain the power S by doing so.
  • SVM Serial Vector Machine
  • the mapper unit 132 performs mapping using different mappers on the data, and calculates the inner product of the data subjected to the mapping and the vector May be configured to select the mapper whose numerical value corresponding to the peak power as a result is the smallest, or when the numerical value corresponding to the peak power falls below a predetermined threshold,
  • the structure which selects the said mapper may be sufficient.
  • the process of taking the inner product of the mapped data and a predetermined vector is performed in parallel, and the numerical value corresponding to the peak power as a result is the smallest. It may be configured to select a mapper. However, in this case, unlike the one shown in Fig.
  • the inner product calculation unit may have a plurality of predetermined vectors.
  • an inner product of data on which a plurality of different mappings are performed and the first vector is taken, and a numerical value corresponding to the peak power as a result is stored for each data.
  • the inner product of the plurality of differently mapped data and the second vector is taken, and a numerical value corresponding to the peak power as a result is stored for each data.
  • the numerical value obtained as a result of the inner product with the first and second vectors may be averaged, and the mapper used for the data having the smallest value may be selected.
  • the transmitting apparatus includes a parallelizing unit that converts input data into parallel symbols, an order changing unit that rearranges the order of the parallel symbols, and at least the above
  • a power measuring unit that determines whether or not the power is greater than a preset threshold value, and when the power measuring unit determines that the power is greater than the threshold value, the order changing unit is controlled.
  • the converting means is controlled to generate a multicarrier modulation signal from the parallel symbols, and the power measuring means is controlled. Then, the control means for measuring the power of the predetermined format of the multicarrier modulation signal, and before the series of processing by the control means reaches a predetermined number of times, the power measurement means reduces the power to the threshold value or less. It is preferable to include a transmission unit that transmits the multi-carrier modulation signal when it is determined that the multi-carrier modulation signal is present.
  • the order is rearranged by the order changing means.
  • the number of parallel symbols equal to the number of subcarriers (subcarriers) is put on each subcarrier.
  • the rearrangement of the order is, for example, when the parallel symbol is ⁇ d, d, d ⁇ , ⁇ d, d
  • examples of the predetermined type of power include peak power, average power, and excess power.
  • the power measuring means determines that the power measured by the power measuring means is larger than a preset threshold value, if the transmission is performed as it is, there is a problem such as a shortened communication distance, so that the power becomes smaller.
  • the order of the parallel symbols is rearranged again by the order changing means to generate a multicarrier modulation signal and measure the power. This series of processing continues until the power falls below the threshold. However, an upper limit is set so that processing will not continue beyond that number.
  • the power measuring means determines that the power is below the threshold value
  • the multicarrier modulation signal is transmitted from the transmitting device by the transmitting means. Is done.
  • the present invention is applicable to all multicarrier modulation schemes, and does not require a phase rotation sequence that requires a large amount of memory. Further, since the parallel symbols are rearranged before the conversion by the conversion means, the power can be effectively reduced. Furthermore, since the multicarrier modulation signal is transmitted as soon as the power falls below the threshold, processing can be performed at high speed.
  • the transmitting apparatus includes a parallelizing unit that converts input data into parallel symbols, an order changing unit that rearranges the order of the parallel symbols, and at least the above A conversion means for converting a data string including parallel symbols whose order has been rearranged by the order change means to generate a multicarrier modulation signal, and measuring the power of a predetermined format of the multicarrier modulation signal generated by the conversion means Then, a power measuring unit that sequentially stores a multicarrier modulation signal having a minimum power, and the order changing unit are controlled to rearrange the order of the parallel symbols, and the conversion unit is controlled to control the conversion from the parallel symbols.
  • Control that generates a multicarrier modulation signal and controls the power measurement means to measure the power of the predetermined format of the multicarrier modulation signal
  • the step when the series of processing by the control means reaches a predetermined number, and transmitting means for transmitting record, the multicarrier modulated signal Ru stored in the power measuring means, it is good preferable comprise.
  • the order is rearranged by the order changing means.
  • the parallel symbol equal to the number of subcarriers is put on each subcarrier.
  • the rearrangement of the order is, for example, when the parallel symbol is ⁇ d, d, d ⁇ , ⁇ d, d, d ⁇ , ⁇ d
  • examples of the predetermined type of power include peak power, average power, and excess power.
  • the control means rearranges the order of the parallel symbols again by the order changing means so as to obtain smaller power, generates a multicarrier modulation signal, and measures the power. This series of processing is continued until a predetermined number of times. When the predetermined number of times is reached, the multicarrier modulation signal having the minimum power stored in the power measurement means is transmitted from the transmission device by the transmission means.
  • the present invention is applicable to all multicarrier modulation schemes, and does not require a phase rotation sequence that requires a large amount of memory. Further, since the parallel symbols are rearranged before the conversion by the conversion means, the power can be effectively reduced. Furthermore, since the multicarrier modulation signal having the minimum power until the predetermined number of times is reached is transmitted, the power can be more reliably reduced.
  • the transmitting apparatus includes a parallelizing means for converting input data into parallel symbols, an order changing means for rearranging the order of the parallel symbols, and at least the above-mentioned A plurality of sets of conversion means for converting a data string including parallel symbols whose order is rearranged by the order change means and generating a multicarrier modulation signal, and each of the order change means Each of them is rearranged in a different order.
  • the power of a predetermined format of the multicarrier modulation signal generated by the conversion means is measured, and one set having a multicarrier modulation signal that minimizes the power is obtained. It is preferable to include a power measurement unit to be selected and a transmission unit to transmit a set of multicarrier modulation signals selected by the power measurement unit.
  • the order is rearranged by the order changing means.
  • the parallel symbol equal to the number of subcarriers is put on each subcarrier.
  • the rearrangement of the order is, for example, when the parallel symbol is ⁇ d, d, d ⁇ , ⁇ d, d, d ⁇ , ⁇ d
  • each order changing means has a different arrangement.
  • the rearrangement is performed in order to reduce the power of a predetermined format when converted into a multicarrier modulation signal by the conversion means, and the power is increased by the rearrangement. Change.
  • the predetermined form of power for example, peak power, There are average power and excess power.
  • the power measuring means measures the power of the multicarrier modulation signal received from the plurality of conversion means, and transmits the multicarrier modulation signal having the minimum power among them from the transmission device by the transmission means.
  • the present invention can be applied to all multicarrier modulation schemes, and does not require a phase rotation sequence that requires a large amount of memory. Further, since the parallel symbols are rearranged before the conversion by the conversion means, the power can be effectively reduced. Furthermore, processing from parallelization of input data to power measurement can be performed in parallel, enabling high-speed processing.
  • the transmitting apparatus includes a parallelizing unit that converts input data into parallel symbols, an order changing unit that rearranges the order of the parallel symbols, and the order changing unit.
  • the inner product calculating means for calculating a numerical value corresponding to a predetermined form of power by taking the inner product of the parallel symbols rearranged in order by the predetermined betatonole, and the numerical value calculated by the inner product calculating means is preset.
  • Power measuring means for determining whether or not the calculated threshold value is greater than the threshold value, and when the numerical value calculated by the power measuring means is determined to be greater than the threshold value, the order changing means is controlled to control the parallel processing.
  • the symbols are rearranged again, and the inner product calculation means is controlled to calculate the inner product of the parallel symbols and the predetermined vector to calculate a numerical value corresponding to the predetermined form of power.
  • Control means for controlling the power measuring means to determine whether or not the calculated numerical value is greater than the threshold value, and the power measurement before the series of processing by the control means reaches a predetermined number of times.
  • a data string including at least the parallel symbols whose order is rearranged by the order changing unit is converted, and a multicarrier modulation signal is generated. It is preferable to include conversion means and transmission means for transmitting the multicarrier modulation signal generated by the conversion means.
  • the inner product of the parallel symbols whose order has been rearranged by the order changing means and the predetermined vector is taken by the inner product calculating means, and for example, a numerical value corresponding to the peak power is calculated. For this reason, it is possible to select a rearrangement that reduces the peak power by means of power measurement without performing IFFT with a large amount of calculation multiple times, so that the calculation time can be reduced.
  • this vector is, for example, SVM (Support Vector Machine) or It can be obtained by using a learning algorithm such as a genetic algorithm and performing prior learning on almost random data so that the numerical value calculated by the inner product calculation reflects the peak power.
  • the peak power is reduced without performing IFFT with a large amount of calculation multiple times. Since sorting can be selected, calculation time can be reduced. In addition, since the multicarrier modulation signal is transmitted immediately when the numerical value corresponding to the power falls below the threshold, processing can be performed at high speed.
  • the transmission apparatus includes a parallelizing unit that converts input data into parallel symbols, an order changing unit that rearranges the order of the parallel symbols, and the order changing unit.
  • the inner product calculating means for calculating a numerical value corresponding to a predetermined form of power by taking the inner product of the parallel symbols rearranged in order by the predetermined betatonole, and the numerical value calculated by the inner product calculating means is minimized.
  • Power measuring means for sequentially storing the parallel symbols, and reordering the parallel symbols by controlling the order changing means, and controlling the inner product calculating means to control the parallel symbols and the predetermined vector.
  • control means To calculate a numerical value corresponding to the predetermined form of power, and to control the power measuring means to store the parallel symbol that minimizes the calculated numerical value.
  • control means a series of processing by the control means reaches a predetermined number of times, it converts the data string containing said parallel symbol stored by at least before Symbol power measuring means, It is preferable to include conversion means for generating a multicarrier modulation signal and transmission means for transmitting the multicarrier modulation signal generated by the conversion means.
  • the inner product of the parallel symbols whose order has been rearranged by the order changing means and the predetermined vector is taken by the inner product calculating means, and for example, a numerical value corresponding to the peak power is calculated. For this reason, it is possible to select a rearrangement that reduces the peak power by means of power measurement without performing IFFT with a large amount of calculation multiple times, so that the calculation time can be reduced. Then, the power measuring means compares the numerical value corresponding to the peak power with the numerical value corresponding to the minimum peak power so far, and sequentially stores the parallel symbols having the minimum numerical value.
  • control means rearranges the order of the parallel symbols again by the order changing means so as to obtain smaller power, and calculates the numerical value corresponding to the peak power, and compares it with the previous minimum value. This series of processing is continued until the predetermined number of times. When the predetermined number of times is reached, at least the parallel symbol having the numerical value is converted into a multicarrier modulation signal by the converting means and transmitted from the transmitting device by the transmitting means.
  • the peak power is reduced without performing IFFT with a large amount of calculation multiple times. Since sorting can be selected, calculation time can be reduced. In addition, since the multicarrier modulation signal having the minimum power until the predetermined number of times is reached is transmitted, the power can be more reliably reduced.
  • the transmitting apparatus includes a plurality of sets of parallelizing means for converting input data into parallel symbols and order changing means for rearranging the order of the parallel symbols. And each of the order changing means performs rearrangement in a different order, and is provided with at least one parallel symbol whose order is rearranged by the order changing means and a predetermined vector.
  • An inner product calculating means for calculating a numerical value corresponding to a predetermined form of power by taking an inner product with the power, a power measuring means for determining the smallest numerical value among the numerical values calculated by the inner product calculating means, and at least the power
  • a conversion means for converting the data string including the parallel symbol having the numerical value determined to be the minimum by the measurement means and generating a multi-carrier modulation signal; and the conversion means. Made a circle And a transmission means for transmitting a multi-carrier modulation signal.
  • the inner product between the parallel symbols whose order has been rearranged by the order changing means and the predetermined vector is taken by the inner product calculating means, and for example, a numerical value corresponding to the peak power is calculated.
  • at least one inner product calculation means is provided, and the inner product with the parallel symbols from the sequential order changing means may be taken, or the same number as the parallelizing means and the order changing means. It is also possible to have a configuration in which inner products with parallel symbols from the order changing means are taken in parallel. As a result, it is possible to select a rearrangement in which the peak power is reduced by the power measurement means that performs IFFT with a large amount of calculation multiple times, so that the calculation time can be reduced.
  • the power measuring means compares numerical values corresponding to the peak power received from the plurality of inner product calculation means, and determines which of the parallel symbols has the minimum value. Then, at least the parallel symbol is converted into a multicarrier modulation signal by the conversion means, and transmitted from the transmission device by the transmission means.
  • the peak power is reduced without performing IFFT with a large amount of calculation multiple times. Since sorting can be selected, calculation time can be reduced. If the same number of inner product calculation means as parallel means and order change means are provided, the processing from parallelization of input data to calculation of a numerical value corresponding to power can be performed in parallel. Processing can be performed at high speed.
  • the transmission device is any one of the transmission devices (1) to (6), and the predetermined type of power is preferably peak power.
  • the power measuring means measures the peak power that is the power at the position where the amplitude is the largest (peak) out of the power that is the square of the amplitude of the multicarrier modulation signal.
  • the peak power which is the largest power among the instantaneous power, is measured. Therefore, it is efficient to transmit a low-power signal that makes it easy to detect the power difference between the multicarrier modulation signals. Yes.
  • the transmission device is any one of the transmission devices (1) to (6), and the power of the predetermined format is equal to or higher than a power value obtained by adding a predetermined value to the average power. It is preferable that the excess power is the sum.
  • the power measuring means has power greater than or equal to a predetermined power value. Therefore, the magnitude of the power can be effectively evaluated without being influenced by the instantaneous fluctuation of the multicarrier modulation signal.
  • by changing the predetermined value it is possible to effectively eliminate the influence of environmental noises, etc., so that accurate power evaluation under various environments becomes possible.
  • the transmitting device is any one of the transmitting devices (1) to (8), and the order changing means preferably uses a shift register.
  • the shift register that is a simple configuration and is generally used for rearranging the order of the parallel symbols is used, so that the power can be effectively reduced and the manufacturing cost can be suppressed. Is possible.
  • the transmission device is any one of the transmission devices (1) to (9), and the conversion means preferably generates a multicarrier modulation signal by using fast Fourier inverse transform. Masle.
  • a general-purpose fast Fourier inverse transform is used when a parallel symbol in the frequency domain (amplitude vs. frequency) is converted into a multi-carrier modulation signal in the time domain (amplitude vs. time).
  • the system configuration is simplified and the manufacturing cost can be reduced.
  • the transmitting device is any one of the transmitting devices (1) to (10), wherein the parallel symphonor is obtained by modulating two orthogonal components obtained by modulating carriers whose phases are different from each other by 90 degrees.
  • the I channel and the Q channel are expressed, and it is preferable that the order changing means performs different sorting on the I channel and the Q channel.
  • the reordering means performs different reordering for the I channel and Q channel, which are two orthogonal components, rather than performing one reordering for the parallel symbols. Therefore, the degree of freedom in generating a multicarrier modulation signal from these two channels is increased, and the power S can be effectively reduced.
  • the transmitting device is any one of the transmitting devices (1) to (11), wherein the order of the parallel symbols is rearranged or rearranged by the order changing unit. It is preferable to apply a cyclic shift to the parallel symbols.
  • the power of rearranging the order of the parallel symbols by the order changing means after the cyclic shift is performed on the parallel symbols, or the rearrangement of the order of the parallel symbols by the order changing means.
  • a cyclic shift on the parallel symbols after The Normally, the shift register provided for performing cyclic shift is simple in configuration and is widely used, so it is inexpensive. Therefore, with the above configuration, a function equivalent to a plurality of order changing means without providing a plurality of order changing means can be realized, so that the power of the multicarrier modulation signal can be effectively reduced and the cost can be reduced. It is possible to keep S low.
  • the transmission device is any one of the transmission devices (1) to (12), and the order of the data string to be converted by the conversion means is rearranged by the order change means. It is preferable to include parallel symbols and information on the rearrangement of the order performed by the order changing means. According to this configuration, the information on the rearrangement of the order is also collected into the data string together with the parallel symbols. Therefore, in the receiving apparatus that has received the multicarrier modulation signal obtained by converting the data string, re-conversion to the data string The information on the rearrangement of the order can be easily extracted. Therefore, it is possible to restore the input data to the transmission apparatus from the data string using the information on the rearrangement of the order.
  • the transmission device is any one of the transmission devices (1) to (12), and the order change information is rearranged by the order change means by the order change means.
  • Pilot insertion means for inserting into one of the symbols included in the parallel symbol after being set and located at a position corresponding to the rearrangement information of the order, and the conversion means includes the pilot insertion means It is preferable to convert a parallel symbol into which the information on the rearrangement is inserted to generate a multicarrier modulation signal.
  • the no-lot insertion unit inserts the information on the rearrangement of the order performed by the order changing unit into the parallel symbol after the order is rearranged by the order changing unit.
  • the original parallel symbol is ⁇ d, d, d ⁇ , for example, ⁇ 1 ⁇ after reordering
  • This information is ⁇ 1 ⁇ when the rearranged parallel symbol sequence is ⁇ d, d, d ⁇
  • the transmitting apparatus is the transmitting apparatus (14), and the information that can specify the rearrangement inserted by the pilot inserting means is preferably a zero value.
  • the pilot insertion means inserts a zero value (a number “0”) into the second symbol which is the position corresponding to the information of the rearrangement.
  • the power of the symbol is determined by other power. It becomes smaller than the power of the symbol. For this reason, it is possible to specify the rearrangement by measuring the power of the symbol, and it is easy to identify the rearrangement.
  • the transmission auxiliary device can be connected to a transmission device including at least a network interface card, and can transmit a digital signal to the transmission device.
  • the order changing means for rearranging the order of the input data composed of serial symbols, the serial symbols whose order has been rearranged by the order changing means, and information on the rearrangement of the order performed by the order changing means, And a multi-carrier output when the data string synthesized by the synthesizing means is received and the data string is input to the transmitter including the network interface card.
  • Reproduction means for reproducing and outputting the modulation signal, and power of a predetermined format of the multicarrier modulation signal output by the reproduction means
  • Power measuring means for measuring and determining whether or not the power is greater than a preset threshold; and when the power measuring means determines that the power is greater than the threshold, the order changing means is controlled.
  • the serial symbols are rearranged again, the conversion means is controlled to generate a multicarrier modulation signal from the serial symbols, and the power measurement unit is controlled to control the predetermined number of the multicarrier modulation signal.
  • Control means for measuring the power of the form, and the combining means when the power measurement means determines that the power is less than or equal to the threshold before the series of processing by the control means reaches a predetermined number of times.
  • transmitting means for transmitting the data string generated by the above as a digital signal to a transmitting apparatus including the network interface card.
  • the order is rearranged by the order changing means before being converted into the input data force multi-carrier modulation signal composed of serial symbols. This is the case, for example, if the serial symbol is ⁇ d
  • ⁇ 1 ⁇ and ⁇ 2 ⁇ are examples of information on order rearrangement performed by the order changing means, and the information and serial symbols are combined into one data string by the combining means.
  • the reproducing means reproduces and outputs the multicarrier modulation signal output when the data string is input to the transmission device including the network interface card.
  • the power measuring means receives the multicarrier modulation signal, measures the power, and determines that the measured power is larger than a preset threshold value. Therefore, the order of the serial symbols is rearranged by the reordering means again so that the power can be reduced, and a multicarrier modulation signal is generated and the power is measured. This series of processing is continued until the electric power falls below the threshold value. However, an upper limit is set so that processing will not continue beyond that limit.
  • the power measuring means determines that the power is equal to or lower than the threshold value
  • the data string that is the source of the multi-carrier modulation signal is converted into a digital signal by the synthesizing means and includes a network interface card. Sent to.
  • the present invention can be applied to all multicarrier modulation schemes, and there is no need for a phase rotation sequence that requires a large amount of memory. Since the rearrangement of the serial symbols is performed before this conversion, the power can be reduced effectively. In addition, since the multicarrier modulation signal is transmitted immediately when the power falls below the threshold, processing can be performed at high speed. In addition, since the waveform output from the network interface card is reproduced, the power of the transmitted signal can be reduced with high accuracy.
  • the transmission auxiliary device can be connected to a transmission device including at least a network interface card, and a digital signal is transmitted to the transmission device.
  • a transmission auxiliary device capable of transmitting a signal, the order changing means for rearranging the order of input data composed of serial symbols, the serial symbol whose order is rearranged by the order changing means, and the order changing means Combining the information of the rearranged order and generating one data string, and receiving the data string synthesized by the synthesizing means, and inputting the data string to the transmitting device including the network interface card
  • a reproduction means for reproducing and outputting the multicarrier modulation signal output at the time, and a power of a predetermined format of the multicarrier modulation signal output by the reproduction means, and a multicarrier modulation signal having a minimum power Power measurement means for storing the data sequence that is the source of the multi-carrier modulation signal in the combining means.
  • the order changing means is controlled to rearrange the order of the serial symbols
  • the reproduction means is controlled to generate a multicarrier modulation signal from the serial symbols
  • the power measuring means is controlled to A control means for measuring the power of the predetermined format of the multicarrier modulation signal, and when a series of processing by the control means reaches a predetermined number of times, a data sequence stored in the combining means is used as the digital signal.
  • Transmitting means for transmitting to a transmitting device including the network interface card.
  • the order is rearranged by the order changing means before being converted into the input data force S composed of serial symbols and the multicarrier modulation signal.
  • ⁇ 1 ⁇ and ⁇ 2 ⁇ are examples of information on order rearrangement performed by the order changing means, and the information and serial symbols are combined into one data string by the combining means.
  • the reproduction means reproduces and outputs a multicarrier modulation signal output when the data string is input to a transmission device including a network interface card.
  • the power measurement means receives the multicarrier modulation signal, measures the power, compares the power with the minimum power so far, and generates the data that is the source of the multicarrier modulation signal having the minimum power.
  • the sequence is sequentially overwritten and stored in the synthesis means.
  • the control means again uses the order changing means to change the order of the serial symbols so as to obtain smaller power. Rearrange the order to generate a multi-carrier modulation signal and measure the power. This series of processing is continued until the predetermined number of times. When the predetermined number of times is reached, the data string that is the source of the multicarrier modulation signal having the minimum power stored in the combining means is transmitted as a digital signal to a transmission apparatus including a network interface card. .
  • the present invention can be applied to all multicarrier modulation schemes, and does not require a phase rotation sequence that requires a large amount of memory.
  • the serial symbols are rearranged before conversion to a multicarrier modulation signal, the power can be reduced effectively.
  • the multicarrier modulation signal having the minimum power until the predetermined number of times is reached is transmitted, the power can be more reliably reduced.
  • the waveform output from the network interface card is faithfully reproduced, the power of the transmission signal can be reliably reduced.
  • the transmission auxiliary device is a transmission auxiliary device (16) or (17), and the power of the predetermined format is preferably the peak power of the multicarrier modulation signal.
  • the power measuring means measures the peak power that is the power at the position where the amplitude is the largest (peak) out of the power that is the square of the amplitude of the multicarrier modulation signal.
  • the peak power which is the largest of the instantaneous power, is measured, it is efficient to transmit a signal with low power that is easy to detect the power difference between the multicarrier modulation signals. Yes.
  • the transmission auxiliary device is a transmission auxiliary device (16) or (17), and the power of the predetermined format is a power value obtained by adding a predetermined value to the average power of the multicarrier modulation signal. It is preferable that the excess power is the sum of the above power.
  • the power measuring means measures the total sum of the power exceeding the predetermined power value, so that it is possible to effectively evaluate the magnitude of the power without being influenced by the instantaneous fluctuation of the multicarrier modulation signal. .
  • by changing the predetermined value it is possible to effectively remove the influence of environmental noise and the like, so that it is possible to accurately evaluate the power under various environments.
  • the transmission auxiliary device is any one of the transmission auxiliary devices (16) to (19), and the order changing means uses a shift register.
  • the shift register is simple and is generally used for rearranging the order of serial symbols. Since the power supply is used, it is possible to reduce the manufacturing cost in addition to effectively reducing the power.
  • the transmission auxiliary device is any one of the transmission auxiliary devices (16) to (20), and the input data includes an I channel obtained by modulating a carrier wave having a phase difference of 90 degrees from each other. It is expressed by a Q channel, and it is preferable that the order changing means performs different sorting on the I channel and the Q channel. According to this configuration, the order changing means performs different permutations for the I channel and the Q channel, which are two orthogonal components, rather than performing one permutation on the input data. Therefore, the degree of freedom in generating a multicarrier modulation signal from these two channels is increased, and the power of the signal can be effectively reduced.
  • the transmission auxiliary device is any one of the transmission auxiliary devices (16) to (21), and the rearrangement unit rearranges the order of the serial symbols before or after the rearrangement. It is preferable to apply a cyclic shift to the serial symbol.
  • the power of rearranging the order of the serial symbols by the order changing means after the cyclic shift is performed on the serial symbols, or the order of the serial symbols by the order changing means is changed. It is assumed that a cyclic shift is applied to the serial symbol after it is done.
  • the shift register provided for performing cyclic shift is simple in configuration and is widely used, so it is inexpensive. Therefore, with the above configuration, a function equivalent to a plurality of order changing means without providing a plurality of order changing means can be realized, so that the power of the multicarrier modulation signal can be effectively reduced and the cost can be reduced. It is possible to keep S low.
  • the receiving apparatus is configured to be able to receive a multicarrier modulation signal transmitted from the transmitting apparatus described in any one of (1) to (13).
  • the same parallel series converted by It is preferable to include order recovery means for generating symbols, and serialization means for reconverting the parallel symbols generated by the order recovery means into data before conversion in the parallelization means.
  • the inverse conversion means converts the multicarrier modulation signal and generates parallel symbols.
  • This parallel symbol reproduces the parallel symbol after the order is rearranged by the order changing means of the transmitter.
  • the extracting means extracts information on the rearrangement of the order performed by the parallel symbol force order changing means. This is, for example, a number such as ⁇ 1 ⁇ , so that if the original parallel symbol ⁇ d is ⁇ d, d, d ⁇
  • the order recovery means rearranges the parallel symbols so that the order of the parallel symbols is restored based on the information.
  • the same parallel symbol converted by the parallelization means is reproduced.
  • the input data to the transmitter is reproduced by converting the parallel symbols into the series symbols by the serializing means.
  • the multicarrier modulation signal generated from the parallel symbols transmitted from the transmission apparatus and rearranged in order to reduce power is received, and the data input to the transmission apparatus is received. It can be restored reliably.
  • the receiving device is a receiving device configured to be able to receive the multicarrier modulation signal transmitted from the transmitting device according to (14) or (15). Then, an inverse conversion unit that converts the multicarrier modulation signal to generate parallel symbols, an individual power measurement unit that measures the power of each symbol of the parallel symbols generated by the inverse conversion unit, and the individual power measurement unit Based on the measured power, the symbol insertion means identifies a symbol inserted with information that can identify the rearrangement, and information on the rearrangement in the order performed by the order changing means from the position of the symbol.
  • the parallel symbol is subjected to the reverse process of the rearrangement performed by the order changing means, Order recovery means for generating the same parallel symbols as those converted by the parallelization means, and serialization for reconverting the parallel symbols generated by the order recovery means into the data before conversion in the parallelization means. And means. [0168]
  • the inverse conversion means converts the multicarrier modulation signal and generates parallel symbols. This parallel symbol reproduces the parallel symbol after the order is rearranged by the order changing means of the transmitter.
  • the individual power measuring means measures the power of each symbol constituting the parallel symbol, and extracts information on the rearrangement of the order performed by the order changing means, for example, from the position of the symbol having the smallest power among them. .
  • the original parallel symbol, d, d ⁇ is ⁇ d, d, d
  • the order recovery means rearranges so as to restore the parallel symbol sequence based on the information.
  • the same parallel symbol converted by the parallelization means is reproduced.
  • the input data to the transmitter is reproduced by converting the parallel symbols into serial symbols by the serialization means.
  • the present invention it is possible to receive information other than data by measuring the power for each received symbol.
  • the transmission device side for example, it is possible to transmit as side information rather than directly inserting into the data what sort has been performed on the parallel symbols. Then, based on the side information, the data input to the transmission device can be reliably restored from the received multicarrier modulation signal.
  • the reception auxiliary device provides a multicarrier modulation signal transmitted from a transmission device connected to the transmission auxiliary device according to any one of (16) to (22).
  • a reception auxiliary device configured to be capable of receiving a digital signal output by a receiving device including at least a network interface card, wherein the digital signal is processed in the order of serial symbols and the order changing unit.
  • Separation means for separating the information into the rearrangement information, and the processing reverse to the rearrangement performed by the order changing means on the serial symbols based on the information on the rearrangement in the order separated by the separation means.
  • order recovery means for generating serial symbols before conversion in the order changing means.
  • the separating means includes a network interface card.
  • the digital signal output from is separated, and the serial symbol and the information on the rearrangement of the order performed by the order changing means are extracted therefrom. Since this digital signal is obtained by performing FFT conversion on the multicarrier modulation signal transmitted from the transmitting device, for example, in the network interface card of the receiving device, it reproduces the data string collected in the combining means.
  • the information that can specify the rearrangement is a number such as ⁇ 2 ⁇ , for example. In this case, the rearranged serial symbol ⁇ d, d, d ⁇ is the original serial symbol.
  • the sequence recovery means can reproduce the input data based on this information.
  • a multicarrier modulation signal generated from a serial symbol transmitted from a transmission device including a network interface card or the like and rearranged to reduce power is received and input.
  • the recovered data can be restored reliably.
  • the transmission / reception system according to the present invention has at least one (1) to (1)
  • the transmission apparatus according to any one of (13) and at least one reception apparatus according to (23) are provided.
  • a transmission / reception system including a transmission device capable of reducing power during transmission and a reception device capable of accurately decoding a multicarrier modulation signal transmitted from the transmission device is realized. be able to.
  • the transmission / reception system according to the present invention includes at least one transmission device according to (14) or (15) and at least one reception device according to (24). It is preferable to be configured with According to this configuration, a transmission / reception system including a transmission device capable of reducing power during transmission and a reception device capable of accurately decoding a multicarrier modulation signal transmitted from the transmission device is realized. can do.
  • the transmission / reception system is described in any one of (16) to (22) connected to at least one transmission device including a network interface card. It is preferable that the transmission auxiliary device is configured to include at least one reception auxiliary device described in (25) connected to a reception device including at least a network interface card. According to this configuration, even when a standard is established by a wireless LAN or the like, for example, the power at the time of transmission can be reduced without newly incorporating order change means in hardware such as a network interface card. Transmission / reception system Stem can be realized.
  • the communication method according to the present invention is a transmission / reception system configured by at least one receiving device that receives a multicarrier modulation signal transmitted from at least one transmitting device.
  • the transmission device includes a parallelization step of converting input data into parallel symbols, an order change step of rearranging the order of the parallel symbols, and a parallel in which the order is rearranged by at least the order change step
  • a conversion step of converting a symbol to generate a multicarrier modulation signal, and a power of a predetermined format of the multicarrier modulation signal generated by the conversion step is measured, and whether or not the power is greater than a preset threshold value And when the power measurement step determines that the power is greater than the threshold, the order change is performed.
  • Reordering the parallel symbols in a step generating a multicarrier modulation signal from the parallel symbol in the conversion step, and measuring the power of the predetermined format of the multicarrier modulation signal in the power measurement step
  • the receiving device receives the multicarrier modulation signal from the transmitting device, converts the multicarrier modulation signal to generate parallel symbols, and the parallel generated by the inverse conversion step.
  • the communication method according to the present invention is a transmission / reception system configured of at least one receiving device that receives a multicarrier modulation signal transmitted from at least one transmitting device.
  • the transmission device includes a parallelization step of converting input data into parallel symbols, and an order of rearranging the order of the parallel symbols.
  • the change process and the information on the rearrangement of the order performed by the order change process are one symbol included in the parallel symbol after the order is rearranged by the order change process, and the rearrangement of the order
  • a pilot insertion process to be inserted into a symbol at a position corresponding to the information of the information and a parallel symbol into which the information on the rearrangement is inserted by the pilot insertion process is converted to generate a multicarrier modulation signal.

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Abstract

L’invention concerne un dispositif d’émission, un dispositif d’aide à l’émission, un dispositif de réception, un dispositif d’aide à la réception, un système d’émission/réception et une méthode d’émission qui peuvent être appliqués entièrement à un système de modulation multiporteuse, y compris les systèmes OFDM, xDSL, et MC-CDMA, et qui peuvent réduire l’énergie électrique nécessaire à l’émission. Les données d’entrée sont converties en symboles parallèles par une unité de conversion S/P (120) dont la séquence est réordonnée par une unité de mappage (130). Ces symboles réordonnés sont alors convertis en signaux de modulation multiporteuse dans une unité IFFT (140) et l’énergie électrique est mesurée par une unité de mesure de puissance crête (150). Ces opérations en série sont répétées un nombre de fois prédéterminé jusqu’à ce que l’énergie atteigne ou soit inférieure à une valeur seuil. Lorsque l’unité de mesure de puissance crête (150) décide que l’énergie a atteint ou est inférieure à une valeur seuil, le signal de modulation multiporteuse est émis du dispositif d’émission par une unité d’émission radio (160).
PCT/JP2005/018837 2005-02-03 2005-10-13 Dispositif d’émission, dispositif d’aide à l’émission, dispositif de réception, dispositif d’aide à la réception, système d’émission/réception et méthode de communication WO2006082675A1 (fr)

Priority Applications (1)

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JP2007501506A JPWO2006082675A1 (ja) 2005-02-03 2005-10-13 送信装置、送信補助装置、受信装置、受信補助装置及び送受信システム並びに通信方法

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JP2005-028130 2005-02-03
JP2005028130 2005-02-03

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JP2007259445A (ja) * 2006-03-20 2007-10-04 Fujitsu Ltd Ｏｆｄｍ通信システムにおける送信装置及び方法
JP2008236053A (ja) * 2007-03-16 2008-10-02 Nippon Telegr & Teleph Corp <Ntt> 適応アンテナ装置、および送信方法
JP2009055395A (ja) * 2007-08-28 2009-03-12 Softbank Mobile Corp 通信装置におけるピーク電力低減装置
WO2009054052A1 (fr) * 2007-10-24 2009-04-30 Fujitsu Limited Dispositif de communication ofdm et procédé de communication ofdm
JP2010505314A (ja) * 2006-09-27 2010-02-18 テレフオンアクチーボラゲット エル エム エリクソン（パブル） 通信システムにおけるピーク対平均電力比の低減方法
JP2010537469A (ja) * 2007-08-14 2010-12-02 エルジー エレクトロニクス インコーポレイティド ピーク対平均電力比を減少させる方法
JP2014007445A (ja) * 2012-06-21 2014-01-16 Icom Inc 通信機および通信方法
JP2014120798A (ja) * 2012-12-13 2014-06-30 Icom Inc 通信機および通信方法

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JPH08274748A (ja) * 1995-03-31 1996-10-18 Victor Co Of Japan Ltd 周波数分割多重信号発生装置
JPH0918444A (ja) * 1995-06-30 1997-01-17 Victor Co Of Japan Ltd Ｏｆｄｍ波変調装置及びその復調装置
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007259445A (ja) * 2006-03-20 2007-10-04 Fujitsu Ltd Ｏｆｄｍ通信システムにおける送信装置及び方法
JP2010505314A (ja) * 2006-09-27 2010-02-18 テレフオンアクチーボラゲット エル エム エリクソン（パブル） 通信システムにおけるピーク対平均電力比の低減方法
JP2008236053A (ja) * 2007-03-16 2008-10-02 Nippon Telegr & Teleph Corp <Ntt> 適応アンテナ装置、および送信方法
JP2010537469A (ja) * 2007-08-14 2010-12-02 エルジー エレクトロニクス インコーポレイティド ピーク対平均電力比を減少させる方法
JP2009055395A (ja) * 2007-08-28 2009-03-12 Softbank Mobile Corp 通信装置におけるピーク電力低減装置
WO2009054052A1 (fr) * 2007-10-24 2009-04-30 Fujitsu Limited Dispositif de communication ofdm et procédé de communication ofdm
JPWO2009054052A1 (ja) * 2007-10-24 2011-03-03 富士通株式会社 Ｏｆｄｍ通信装置およびｏｆｄｍ通信方法
JP2014007445A (ja) * 2012-06-21 2014-01-16 Icom Inc 通信機および通信方法
JP2014120798A (ja) * 2012-12-13 2014-06-30 Icom Inc 通信機および通信方法

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