JPWO2006082675A1 - Transmission device, transmission auxiliary device, reception device, reception auxiliary device, transmission/reception system, and communication method - Google Patents

Abstract

A transmitter, a transmission auxiliary device, a reception device, a reception auxiliary device, and a transmission/reception system, which are applicable to general multicarrier modulation systems including OFDM, xDSL and MC-CDMA systems and can reduce power at the time of transmission, Provide a communication method.
After the input data is converted into parallel symbols by the S/P conversion unit 120, the order is rearranged by the mapper unit 130. Then, after being converted into a multicarrier modulation signal in IFFT section 140, power is measured by peak power measuring section 150. This series of processing is repeated a predetermined number of times or less and is continued until the electric power becomes equal to or less than the threshold value. Then, when the peak power measuring unit 150 determines that the power has become equal to or less than the threshold value, the multi-carrier modulated signal is transmitted from the transmitting device by the wireless transmitting unit 160.

Description

  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 which are used in a digital communication system and communicate by a multicarrier modulation method.

2. Description of the Related Art In recent years, in digital communication, especially mobile communication, a multi-carrier modulation method has been attracting attention in order to realize high-speed transmission by effectively utilizing limited frequency resources. The multi-carrier modulation method is a method of distributing a series of data to a large number of carriers and transmitting them in parallel, as opposed to a single carrier method in which a carrier for carrying a signal is one. Among the multi-carrier modulation schemes, OFDM (Orthogonal
The Frequency Division Multiplexing) method is resistant to frequency selective fading, and it is possible to reduce the effect of intersymbol interference in a multipath environment by using guard intervals. It is being appreciated.

Further, as another technique for suppressing frequency selective fading, a plurality of different codes (PN codes) are attached to each line, and it is determined from the codes that the lines are different from each other.
Multiple Access) method is known. And more recently, the MC-CDMA (Multi-Carrier Code Division Multiple Access) method, which is a fusion method that effectively uses the frequency by the CDMA method and reduces the influence of multipath by the OFDM method, has been attracting attention. ..

However, it is known that the transmission signal of multicarrier transmission has a peak power that is extremely higher than the average power because it is the sum of modulated subcarriers. This is due to PAPR (Peak-to-Average).
Power Ratio) problem is called. In general, PAPR is known to increase with the number of subcarriers forming a signal. Therefore, in the OFDM system and the MC-CDMA system, which are multi-carrier modulation systems, the number of subcarriers is as large as several thousands, so that it has a problem of having an extremely large PAPR.

  Therefore, the PAPR problem in multicarrier transmission has been discussed before, and as an example, FIG. 32 shows a functional block diagram showing the configuration of a conventional OFDM/xDSL system transmission apparatus using a phase rotation sequence. First, the phase rotation sequence selection unit 820 reads the phase rotation amount (in this example, it is assumed to be “0” or “π”) stored in the phase rotation sequence 810, and a code designating the phase rotation amount. The phase rotation sequence information is sent to the S/P conversion unit 830 and the phase rotation amount is sent to the phase rotation unit 840.

When the data from the user is input, the S/P conversion unit 830 converts the input data and the phase rotation series information from serial (serial) format to parallel (parallel) format (serial/parallel conversion), It is placed on a predetermined N subcarriers. Here, an example in which the parallelized data strings are represented as {d ₁ , d ₂ , d ₃ ,..., D _N } and expressed in the QPSK (Quadrature Phase Shift Keying) format is shown in FIG. 32 as signal points. Show. Here, on the right side of the notation such as d ₁ , the signal points of the data string are indicated by black circles on the coordinate axis with the I channel component as the horizontal axis and the Q channel component as the vertical axis. For example, the signal point of d _{1 is} a point where the I channel component is “1” and the Q channel component is “1”, and (I,Q)=(1,1), and the signal point of d ₂ is , (I,Q)=(−1,−1).

Subsequently, the data string is subjected to phase rotation in the phase rotation unit 840. When the amount of phase rotation is {π, 0,..., π} as shown in the figure, the signal points after the phase rotation are as shown in the figure. That is, d ₁ rotates counterclockwise π (180 degrees) on the coordinate axis, and d ₂ does not rotate because the rotation amount is “0”. Next, the data string subjected to the phase rotation is subjected to Inverse Fast Fourier Transformation in the IFFT unit 850, and the data in the frequency domain (amplitude vs. frequency) is a signal in the time domain (amplitude vs. time). Is converted to.

  Next, peak power measuring section 860 measures the peak power of the signal over one symbol of the OFDM signal, and when peak power is larger than a predetermined threshold value, it is notified to phase rotation sequence selecting section 820. Then, the phase rotation sequence selection unit 820 reads a phase rotation amount different from the previous one, and thereafter repeats the same processing as described above and sends the data to the S/P conversion unit 830. On the contrary, as a result of the measurement by the peak power measuring unit 860, when the peak power is less than or equal to a predetermined threshold value, the signal received from the peak power measuring unit 860 is transmitted from the wireless transmission unit 870 via the antenna 880.

  In addition to the above OFDM/xDSL system, for example, Patent Document 1 discloses a technique for reducing the peak power during transmission in the MC-CDMA system. FIG. 33 is a functional block diagram showing the configuration of a conventional MC-CDMA transmission apparatus. When data is input from a plurality of users, the spreading units 915-1 to 91-M receive the channelization code from the channelization code generating unit 910 and spread the data. As an example of this spreading, if the input data displayed in the QPSK format is as shown in (a) at the bottom of FIG. 33, the data after spreading is as shown in (b). In this case, the channelization code is {1,-1,1,-1} for the I channel and {1,1,-1,-1,-1} for the Q channel.

  The data spread by the spreading units 915-1 to M are subsequently multiplexed by the data multiplexing unit 920. The result is, for example, the one shown in (c). Next, the scramble code generator 925 multiplies the scramble code by the scramble code multiplier 930 by the data multiplexed by the data multiplexer 920. Here, if the scramble code is {1,-1,1,1} for the I channel and {-1,1,1,1} for the Q channel, the scramble code multiplication unit The data after multiplication at 930 is as shown in (d).

  Subsequently, the scramble information selection unit 990 sends the scramble code multiplied by the data to the S/P conversion unit 940, and the S/P conversion unit 940 receives the multiplied data received from the scramble code multiplication unit 930, The scramble code received from scramble information selecting section 990 is placed on different subcarriers. The IFFT unit 950 sends a signal obtained by applying IFFT to the data received from the S/P conversion unit 940 to the peak power measurement unit 960. This signal is, for example, the one shown in (e).

  The peak power measurement unit 960 measures the peak power of the signal received from the IFFT unit 950, and when the peak power is larger than a predetermined threshold, notifies the scramble code generation unit 925 and again differs from the previous time. Generate a scramble code. After that, the scramble code multiplication unit 930 and the scramble information selection unit 990 repeat the same processing as described above, and send the data to the S/P conversion unit 940. On the contrary, as a result of the measurement by the peak power measuring unit 960, when the peak power is less than or equal to a predetermined threshold value, the signal received from the peak power measuring unit 960 is transmitted from the wireless transmission unit 970 via the antenna 980.

However, the above-described OFDM/xDSL type transmission apparatus includes the phase rotation series 810 that stores the amount of phase rotation, and the amount of memory for storing this amount of phase rotation increases as the number of subcarriers increases. Will be things. Further, the transmitter using this amount of phase rotation has a problem of a lot of redundancy. Further, since the above MC-CDMA transmission apparatus has a form in which the scramble code is cyclically shifted, it cannot be applied to other multicarrier schemes such as the OFDM scheme.
JP, 2003-32220, A

  The present invention has been made in view of the above problems, and is applicable to all multicarrier modulation systems including OFDM, xDSL, and MC-CDMA systems, and has a large amount of memory in addition to a large redundancy. An object of the present invention is to provide a transmitting device, a receiving device, a transmitting/receiving system, and a communication method capable of reducing power at the time of transmission without requiring a necessary phase rotation sequence or the like.

  To this end, the transmitting apparatus according to an aspect of the present invention includes a parallelizing unit that converts input data into parallel symbols, an order changing unit that changes the order of the parallel symbols, and at least an order changing unit that changes the order. Converting the data sequence including the rearranged parallel symbols, converting means for generating a multi-carrier modulated signal, and measuring the power of a predetermined format of the multi-carrier modulated signal generated by the converting means, and the power is preset. A power measuring unit that determines whether or not the power is greater than a set threshold value, and when the power is determined by the power measuring unit to be greater than the threshold value, the order changing unit is controlled to change the order of the parallel symbols. Control means for rearranging again, controlling the converting means to generate a multicarrier modulated signal from the parallel symbol, and controlling the power measuring means to measure the power of the predetermined format of the multicarrier modulated signal. And a transmitting unit that transmits the multicarrier modulated signal when the power is determined to be equal to or lower than the threshold value by the power measuring unit before the series of processes by the control unit reaches a predetermined number of times. It is characterized by

  Further, a transmitting apparatus according to another aspect of the present invention is a parallelizing means for converting input data into parallel symbols, an order changing means for rearranging the order of the parallel symbols, and an order changing means for at least the order changing means. The conversion means for converting the data sequence containing the parallel symbols to generate a multi-carrier modulation signal, and measuring the power of a predetermined format of the multi-carrier modulation signal generated by the conversion means, A power measuring unit for sequentially storing carrier modulation signals, controlling the order changing unit to rearrange the order of the parallel symbols, and controlling the conversion unit to generate a multicarrier modulation signal from the parallel symbols. Control means for controlling the power measuring means to measure the power of the predetermined format of the multi-carrier modulated signal, and storing in the power measuring means when a series of processes by the control means reaches a predetermined number of times. And transmitting means for transmitting the multi-carrier modulated signal.

  Further, a transmitting apparatus according to another aspect of the present invention is a parallelizing means for converting input data into parallel symbols, an order changing means for rearranging the order of the parallel symbols, and an order changing means for at least the order changing means. And a conversion means for converting the data sequence including the parallel symbols to generate a multi-carrier modulated signal, and each of the order changing means performs rearrangement in a different order. Power measuring means for measuring the power of a predetermined format of the multi-carrier modulated signal generated by the converting means, and selecting one set having the multi-carrier modulated signal having the minimum power, and the power measuring means. Transmitting means for transmitting the set of multi-carrier modulated signals selected by the means.

  Further, a transmitting apparatus according to another aspect of the present invention is a parallelizing unit that converts input data into parallel symbols, an order changing unit that changes the order of the parallel symbols, and an order changing unit that changes the order. The inner product of the parallel symbols and a predetermined vector to calculate a numerical value corresponding to the power of a predetermined format, and whether the numerical value calculated by the inner product calculating means is larger than a preset threshold value. If the power measurement means to determine whether or not the calculated numerical value by the power measurement means is larger than the threshold value, the order changing means is controlled to rearrange the order of the parallel symbols, The inner product calculating means is controlled to calculate an inner product of the parallel symbol and the predetermined vector to calculate a numerical value corresponding to the electric power of the predetermined format, and the power measuring means is controlled to calculate the calculated numerical value. A control unit that determines whether or not it is greater than a threshold value, and before the series of processes by the control unit reaches a predetermined number of times, the power measurement unit determines that the calculated numerical value is equal to or less than the threshold value. A conversion means for converting at least the data sequence containing the parallel symbols whose order has been rearranged by the order changing means to generate a multicarrier modulated signal; and a transmission for transmitting the multicarrier modulated signal generated by the converting means. Means and are provided.

  Further, a transmitting apparatus according to another aspect of the present invention is a parallelizing unit that converts input data into parallel symbols, an order changing unit that changes the order of the parallel symbols, and an order changing unit that changes the order. The inner product calculating means for calculating the numerical value corresponding to the electric power of the predetermined format by taking the inner product of the parallel symbol and the predetermined vector, and the parallel symbol having the minimum numerical value calculated by the inner product calculating means are sequentially stored. Power measuring means and the order changing means to rearrange the order of the parallel symbols again, and to control the inner product calculating means to obtain an inner product of the parallel symbols and the predetermined vector, and the predetermined format. Control means for calculating a numerical value corresponding to the electric power, controlling the electric power measuring means to store the parallel symbol having the minimum calculated numerical value, and a series of processing by the control means reaches a predetermined number of times. At this time, at least the conversion means for converting the data sequence including the parallel symbols stored by the power measuring means to generate a multicarrier modulation signal, and the multicarrier modulation signal generated by the conversion means are transmitted. And a transmission means.

  Further, a transmitting apparatus according to another aspect of the present invention is configured to include 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. Further, each of the order changing means performs rearrangement in a different order, and at least one of them is provided, and an inner product of a parallel symbol whose order is changed by the order changing means and a predetermined vector is calculated. In the inner product calculating means for calculating a numerical value corresponding to the electric power of a predetermined format, a power measuring means for judging the smallest numerical value among the numerical values calculated by the inner product calculating means, and at least it is judged as the minimum by the power measuring means A conversion means for converting the data sequence including the parallel symbols having the selected numerical value to generate a multi-carrier modulation signal, and a transmission means for transmitting the multi-carrier modulation signal generated by the conversion means. And

  Further, for the above purpose, the transmission auxiliary device according to one aspect of the present invention is a transmission auxiliary device that is connectable to at least a transmission device including a network interface card and is capable of sending a digital signal to the transmission device. An order changing unit that changes the order of the input data composed of serial symbols, a serial symbol whose order is changed by the order changing unit, and information of the order change performed by the order changing unit are combined into one. A synthesizing unit for generating a data sequence and a data sequence synthesized by the synthesizing unit are received, and a multicarrier modulation signal output when the data sequence is input to a transmitter including the network interface card is reproduced. Reproducing means for outputting, power measuring means for measuring the power of a predetermined format of the multi-carrier modulated signal output by the reproducing means, and determining whether the power is larger than a preset threshold value, the power When the measuring means determines that the power is larger than the threshold value, the order changing means is controlled to rearrange the order of the serial symbols, and the converting means is controlled to perform multicarrier modulation from the serial symbols. Control means for generating a signal and controlling the power measuring means to measure the power of the predetermined format of the multi-carrier modulated signal; and the power 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 combining means to the transmitting device including the network interface card as the digital signal when the measuring means determines that the power is equal to or less than the threshold value. Characterize.

  A transmission auxiliary device according to another aspect of the present invention is a transmission auxiliary device that can be connected to a transmission device including at least a network interface card and can send a digital signal to the transmission device, and is composed of serial symbols. An order changing unit that changes the order of the input data, a serial symbol whose order is changed by the order changing unit, and information of the order change performed by the order changing unit are combined to generate one data string. And a reproducing means for receiving the data string combined by the combining means, and for reproducing and outputting a multi-carrier modulated signal output when the data string is input to a transmitter including the network interface card. And measuring the power of a predetermined format of the multi-carrier modulation signal output by the reproducing means, and when the multi-carrier modulation signal having the minimum power is detected, the synthesizing means is the source of the multi-carrier modulation signal. A power measuring means for storing the data sequence, and the order changing means for controlling the order of the serial symbols to be rearranged again, and controlling the reproducing means for generating a multicarrier modulation signal from the serial symbols. Control means for controlling the power measuring means to measure the power of the predetermined format of the multi-carrier modulated signal, and stored in the combining means when a series of processing by the control means reaches a predetermined number of times. And a transmitting means for transmitting the data sequence as a digital signal to a transmitting device including the network interface card.

  Further, for the above object, a communication method according to an aspect of the present invention is a communication in a transmission/reception system including at least one receiving device for receiving a multicarrier modulated signal transmitted from at least one transmitting device. In the method, the transmission device includes a parallelization step of converting input data into parallel symbols, a reordering step of reordering the order of the parallel symbols, and a parallel symbol reordered by at least the reordering step. And converting the multi-carrier modulated signal to generate a multi-carrier modulated signal, measuring the power of a predetermined format of the multi-carrier modulated signal generated by the converting step, and determining whether the power is greater than a preset threshold value. When the power is determined to be greater than the threshold by the power measurement step of determining and the power measurement step, the order of the parallel symbols is rearranged again by the order changing step, and the parallel symbols are changed by the conversion step. A control step of generating a multicarrier modulation signal and measuring the power of the predetermined format of the multicarrier modulation signal by the power measurement step, and the power before the series of processes by the control step reaches a predetermined number of times. A transmitting step of transmitting the multi-carrier modulated signal when the power is determined to be equal to or lower than the threshold by the measuring step, the receiving device receives the multi-carrier modulated signal from the transmitting device, An inverse conversion step of converting the multi-carrier modulated signal to generate parallel symbols, and an extraction step of extracting the information of the rearrangement of the order performed by the order changing step from the parallel symbols generated by the inverse conversion step, Based on the information on the rearrangement of the order extracted by the extracting step, the parallel symbol is subjected to the reverse processing of the rearrangement performed by the rearrangement step, and the same parallel as the one converted by the parallelizing step. It is characterized by comprising an order recovery step of generating symbols, and a serialization step of reconverting the parallel symbols generated by the order recovery step into data before conversion in the parallelization step.

  A communication method according to another aspect of the present invention is a communication method in a transmission/reception system configured to include at least one receiving device, which receives a multicarrier modulated 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 information of the order change performed by the order change step in the order. A pilot insertion step of inserting into one symbol included in the parallel symbols after the order is rearranged by the changing step, the symbol being at a position corresponding to the rearrangement information of the order, and the pilot insertion step. Converting the parallel symbol in which the information of the rearrangement of order is inserted to generate a multicarrier modulation signal, and measuring the power of a predetermined format of the multicarrier modulation signal generated by the conversion step, A power measurement step of determining whether or not the power is greater than a preset threshold, and when the power is determined to be greater than the threshold by the power measurement step, the order of the parallel symbols is changed by the order changing step. A rearrangement, a control step of generating a multicarrier modulation signal from the parallel symbol by the conversion step, and measuring the power of the predetermined format of the multicarrier modulation signal by the power measurement step, and a series of the control steps. Before the process of reaching a predetermined number of times, a transmitting step of transmitting the multi-carrier modulated signal when the power is determined to be equal to or less than the threshold by the power measuring step, and the receiving device, An inverse conversion step of receiving the multi-carrier modulated signal from the transmission device, converting the multi-carrier modulated signal to generate parallel symbols, and individually measuring the power of each symbol of the parallel symbols generated by the inverse conversion means. Based on the power measured in the power measuring step and the power measured in the individual power measuring step, the symbol in which the information capable of specifying the rearrangement is inserted is specified in the pilot inserting step, and the order changing step is performed from the position of the symbol. Based on the extraction step of extracting the information of the rearrangement of the order, and the information of the rearrangement of the order extracted by the extraction step, the reverse processing of the rearrangement performed by the rearrangement step is performed on the parallel symbols. And performing an order recovery step for generating the same parallel symbol converted by the parallelization step and a parallel symbol generated by the order recovery step. The serialization step of re-converting the data into the data before the conversion in the parallelization step.

  Objects, features, aspects, and advantages of the present invention will become more apparent by the following detailed description and the accompanying drawings.

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 the configuration of the transmission device according to the first embodiment of the present invention. FIG. 3 is a schematic diagram for explaining the 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 transmitter of the OFDM/xDSL system 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 device according to the first embodiment of the present invention. FIG. 7 is a flowchart showing the flow of processing performed by the OFDM/xDSL system receiving apparatus shown in FIG. FIG. 8 is a functional block diagram showing the configuration of the transmission device according to the second embodiment of the present invention. FIG. 9 is a flowchart showing the flow of processing performed by the transmitter of the OFDM/xDSL system shown in FIG. FIG. 10 is a functional block diagram showing the configuration of the transmission device according to the third embodiment of the present invention. FIG. 11 is a functional block diagram showing the configuration of the receiving device according to the third embodiment of the present invention. FIG. 12 is a flowchart showing the flow of processing performed by the transmitter of the OFDM/xDSL system shown in FIG. FIG. 13 is a flowchart showing the flow of processing performed by the OFDM/xDSL system receiving apparatus shown in FIG. FIG. 14 is a schematic diagram showing pilot insertion performed by pilot inserting section 135. FIG. 15 is a functional block diagram showing the configuration of the transmission device according to the fourth embodiment 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 device according to the fourth embodiment of the present invention. FIG. 18 is a flowchart showing the flow of processing performed by the receiving device shown in FIG. 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. FIG. 20 is a functional block diagram showing the configuration of the transmission device according to the fourth embodiment of the present invention. FIG. 21 is a functional block diagram showing the configuration of the transmission device according to the fourth embodiment of the present invention. FIG. 22 is a schematic diagram showing (a) transmitter and (b) receiver of a normal wireless LAN. FIG. 23 is a schematic diagram showing (a) a transmitter and (b) a receiver of the wireless LAN according to the fifth embodiment of the present invention. FIG. 24 is a diagram showing PAPR characteristics when the number of interleavers provided in the mapper unit and the number of conventional phase rotation sequences are changed using the transmission unit according to the fifth embodiment of the present invention. FIG. 25 is a diagram showing out-of-band radiation characteristics when the transmitting unit according to the fifth embodiment 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 an embodiment of the pseudo random 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 device according to a modification of the present invention. FIG. 32 is a functional block diagram showing a configuration of a conventional OFDM/xDSL system transmitter using a phase rotation sequence. FIG. 33 is a functional block diagram showing the configuration of a conventional MC-CDMA transmission apparatus.

  Hereinafter, OFDM/xDSL and downlink MC-CDMA will be described as an example of a multicarrier modulation signal transmission/reception system with reference to the drawings.

  FIG. 1 is a schematic configuration diagram showing a multicarrier modulation signal transmission/reception system (hereinafter, also appropriately referred to as a transmission/reception system) according to an embodiment of the present invention. The transmission/reception system includes at least one base station (transmission device) 10 and at least one mobile phone (reception device) 20. The radio wave transmitted from the base station 10 is encoded so that the peak power value is low, and the data transmitted from the base station 10 after being decoded by the mobile phone 20 receiving the radio wave is displayed as character data. Alternatively, it can be transmitted as voice data.

In FIG. 1, a mode in which the mobile phone 20 receives a 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, a plurality of user terminals can be provided by a wireless LAN. The (computers) may transmit/receive signals to/from each other, or may transmit/receive signals between at least one user terminal and an access point. In a wireless communication method such as FWA (Fixed Wireless Access) or UWB (Ultra Wide Band), a signal is transmitted and received between a base station and at least one user terminal. It may be. Furthermore, ADSL (Asymmetric Digital) which is a wired communication system
In the Subscriber Line), signals may be transmitted and received between the telephone station and the user terminal.

  Hereinafter, the communication method capable of reducing the peak power according to the present invention, and the configurations of the transmission device and the reception device will be described separately for OFDM/xDSL and downlink MC-CDMA.

[Embodiment 1]
FIG. 2 is a functional block diagram showing the configuration of the transmission device according to the first embodiment of the present invention. The transmission device 10 includes a mapper selection unit 110, an S/P conversion unit (parallelization unit) 120, a mapper unit (order change unit) 130, an IFFT unit (conversion unit) 140, a peak power measurement unit (power measurement unit) 150, A wireless transmission unit (transmission means) 160 and an antenna 170 are provided.

  In addition, in the present embodiment and the following embodiments, 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 to perform a desired function. To fulfill. For example, in the transmission device of the present embodiment, the control unit controls the mapper unit 130 to change the order of parallel symbols when the peak power measurement unit 150 determines that the peak power is higher than a preset threshold value. The rearrangement is performed, the IFFT unit 140 is controlled to generate a multicarrier modulation signal from the parallel symbol, and the peak power measuring unit 150 is controlled to measure the power of the predetermined format of the multicarrier modulation signal.

  The mapper selection unit 110 selects which of the mappers included in the mapper unit 130 is to be processed by the input data, and uses the mapper information {i}, which is information indicating the selected mapper, as side information. It is sent to the IFFT unit 140. Further, when the value of {i} exceeds the maximum value of the number of mappers prepared in the mapper unit 130 (hereinafter, i_{max}), the mapper selecting unit 110 causes the peak power measuring unit 150 to perform the measurement. A notification is sent and the signal with the smallest peak power is transmitted.

  The S/P converter 120 converts the input data from serial format to parallel format, and puts 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 from the S/P conversion unit 120 to rearrange the order of the parallel symbols. Here, the mapper is, for example, a shift register.

FIG. 3 is a schematic diagram for explaining the function of a shift register used as a mapper in the embodiment of the present invention. Here, description will be made assuming that the data parallelized in the S/P conversion unit 120 is input. Input data (parallel symbols) {d ₁ , d ₂ , d ₃ ,..., D _N } for one symbol of the parallelized OFDM signal are shifted by, for example, {m} in the shift register. That is, when m is smaller than N, the position of the input data d ₁ is replaced with the data d _N−m+1 and the position of the input data d _N is replaced with the data d _N−m , as shown in FIG. _{N-m + 1, ···,} d N, d 1, d 2, ···, d N-m-1, d N-m output data that} is obtained.

  The IFFT unit 140 collects the parallel symbols received from the mapper unit 130 and the mapper information received from the mapper selecting unit 110 into one data string, applies IFFT to the data string, and frequency-domain (amplitude-versus-frequency) data is time-stamped. Convert to a domain (amplitude vs. time) multi-carrier modulated signal. As described above, since the data is spread in the frequency direction, the OFDM and MC-CDMA systems are frequency spreading, and the frequency diversity effect can be obtained.

  Further, when the IFFT unit 140 collects the mapper information received from the parallel symbols and the mapper selecting unit 110 into one data string, the mapper information is inserted into a predetermined subcarrier. This mapper information is information indicating the selected mapper. For example, when the 10th mapper is used, data corresponding to “10” is inserted into a predetermined subcarrier.

  The peak power measuring unit 150 stores a predetermined threshold value, measures the peak power that is the instantaneous value (square of the amplitude) of the power of the time domain signal received from the IFFT unit 140 at each time, and When the peak power is larger than the stored threshold value, the fact is notified to the mapper selection unit 110. Then, the peak power measuring section 150 stores the signal in the peak power measuring section 150. On the other hand, if the measured peak power is less than or equal to the stored threshold value, the signal is sent to the wireless transmission unit 160. The wireless transmission unit 160 transmits the signal received from the peak power measurement unit 150 via the antenna 170.

  FIG. 4 is a flow chart showing the flow of processing performed by the transmitter of the OFDM/xDSL system shown in FIG. Here, it is assumed that data is input by the QPSK method, which is an example of the multilevel modulation method. The QPSK method is a method of changing the phases of two carriers whose phases are different by 90 degrees according to input data, and combining them to transmit. On the other hand, there is also a method called QAM (Quadrature Amplitude Modulation), which is a method in which not only the phases of two carriers whose phases are different by 90 degrees but also the amplitudes are changed according to input data, and these are combined to transmit. This QAM includes, for example, 16QAM in which a carrier is changed into 16 kinds of states having different amplitudes and phases to transmit a signal, and 64QAM in which a carrier is changed to 64 kinds of states and a signal is transmitted. The QPSK method is equivalent to 4QAM.

  In the case of the QPSK system, input data is separated into an I channel (in-phase component) and a Q channel (quadrature component) by an IQ separator (splitter) not shown. In the I channel and the Q channel, the carrier phase is shifted by 90 degrees. When this serial format data is input, the S/P conversion unit 120 converts the data into parallel format (step S101).

Parallel symbols that are parallelized data are represented by {d ₁ , d ₂ , d ₃ ,..., D _N } and an example thereof is shown in FIG. Here, on the right side of the notation such as d ₁ , 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. For example, the signal point of d _{1 is} a point where the I channel component is “1” and the Q channel component is “1”, and (I,Q)=(1,1), and the signal point of d ₂ is , (I,Q)=(−1,−1).

  Then, the transmission device maps the parallel symbols by the mapper, adds the mapper information to the multi-carrier modulated signal, and then transmits a signal having a small peak power (step S102). Here, the mapper information is information such as the number of shifts when a shift register is used as the mapper.

  FIG. 5 is a flowchart showing in detail the flow of processing in step S102. First, when the data sent from the S/P conversion unit 120 is input to the mapper unit 130, the mapper selection unit 110 initializes mapper information indicating which mapper to use, and sets i=1 (step S201). Therefore, the mapper selection unit 110 selects the mapper {1} as the first mapper, and the mapper unit 130 performs mapping using the mapper {1} (step S202).

  Here, in the present embodiment and the following embodiments, the mapping performed by the mapper unit may be the same for the I channel and the Q channel, or may be different. In particular, when the mapping is different between the I channel and the Q channel, the effect of reducing the peak power described later becomes greater, which is preferable.

Further, the mapper {1} means that when the shift register is used in the mapper unit 130, the shift number is “1”, for example. The signal points after the shift when the number of shifts is "1" are shown in FIG. As shown in this figure, the input data {d ₁ , d ₂ , d ₃ ,..., D _N } is {d _N , d ₁ , d ₂ , d ₃ ,... After mapping in the mapper unit 130. , D _N−1 } and is sent to the IFFT unit 140.

  Next, the IFFT unit 140 receives the mapped data from the mapper unit 130, collects the mapped data together with the mapper information received from the mapper selecting unit 110 into one data string, and applies the IFFT to 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 measuring unit 150 measures the peak power of the signal at each time (step S204). As a result, when the peak power of the signal is equal to or lower than the predetermined threshold value (No in step S205), the signal is transmitted via the antenna 170 (step S206). If there is the next data to be continuously transmitted (Yes in step S212), the process returns to step S201 to continue the subsequent processing.

  On the other hand, if the peak power of the signal is larger than the predetermined threshold value in step S205 (Yes in step S205), the peak power measuring unit 150 determines whether the peak power is the smallest measured up to now for the signal. Is determined (step S207). In this case, since it is the first time to reach step S207, it is determined that the peak power is the minimum (Yes in step S207), and the peak power is overwritten and saved in the predetermined area in the peak power measuring unit 150 (step S208). ).

  When the above storage is completed, the peak power measuring unit 150 notifies the mapper selecting unit 110 to select the next mapper. The mapper selection unit 110 increments the value of {i} that is mapper information by 1 (step S209), and then determines whether or not the value continues to exceed the number i_{max} of mappers prepared in the mapper unit 130. It is determined whether or not (step S210). As a result, if it is determined that the value of the mapper information {i} does not exceed i_{max} (No in step S210), the mapper selection unit 110 selects the mapper {i} in step S202 (in this case, i =2), perform mapping.

  On the other hand, if it is determined in step S210 that the value of {i} exceeds i_{max} (Yes in step S210), the peak power measurement unit 150 determines that the peak power measurement unit 150 has saved the signal, that is, the peak so far. The signal with the minimum power is sent to the wireless transmission unit 160, and the wireless transmission unit 160 transmits the signal via the antenna 170 (step S211). Then, if there is the next data to be continuously transmitted (Yes in step S212), the process returns to step S201 to continue the subsequent processing.

  The configuration and processing flow of the receiving device that receives the signal transmitted from the above transmitting device will be described below. FIG. 6 is a functional block diagram showing the configuration of the receiving apparatus according to the first embodiment of the present invention, and FIG. 7 is a flowchart showing the flow of processing performed by the OFDM/xDSL system receiving apparatus shown in FIG. .. The reception device 20 includes an antenna 210, a wireless reception 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.

  First, when the antenna 210 receives the 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 wireless reception unit 220, and converts the signal in the time domain (amplitude vs. time) into data in the frequency domain (amplitude vs. frequency) (step). S302). Subsequently, the mapper information extraction unit 240 extracts mapper information from the data decomposed into subcarriers in the FFT unit 240 (step S303) and sends it to the demapper unit 250.

  The demapper unit 250 includes the same plurality of mappers as those included in the transmission device 10, and identifies the mapper used in the mapper unit 130 based on the mapper information received from the mapper information extraction unit 240, Processing (demapping) opposite to that of the mapper is performed (step S304). 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. 2, the direction of the shift in the mapper unit 130 is opposite to that of the shift direction. Corresponding to shifting by "1".

  Finally, the P/S conversion unit 260 converts the parallel format data received from the demapper unit 250 into a serial format (step S305). Then, if there is the next data to be continuously received (Yes in step S306), the process returns to step S301 to continue the subsequent processing.

  According to the present embodiment described above, it is applicable to all multi-carrier modulation schemes, and in addition to the need for a phase rotation sequence requiring a large amount of memory, etc., before conversion by the conversion means, Since the parallel symbols are rearranged, the power can be effectively reduced. Further, when the multi-carrier modulated signal is transmitted immediately when the power becomes equal to or lower than the threshold value, the processing can be performed at high speed. On the other hand, when transmitting a multi-carrier modulated signal having the minimum power until reaching a predetermined number of times, the power can be reduced more reliably.

[Embodiment 2]
In the above-described first embodiment, the input data is mapped in the mapper unit 130, and the process of selecting the mapper so as to reduce the peak power of the mapped data is continuously performed. In the present embodiment, a mode in which data mapping to peak power measurement are performed in parallel in a plurality of circuits will be described. In the present embodiment, the S/P converters 120-1 to 120-M, the mapper units 130-1 to M, the IFFT units 140-1 to 140-M, the peak power measuring unit 150a, and the wireless transmission unit 160 are respectively parallelizing means. , Function changing means, converting means, power measuring means, and transmitting means.

  FIG. 8 is a functional block diagram showing the configuration of the transmission device according to the second embodiment of the present invention. In the present embodiment, instead of providing the functional unit corresponding to the mapper selecting unit 110 of the first embodiment, circuits corresponding to the number of mappers (hereinafter, the number is referred to as M) included in the mapper unit 130 are arranged in parallel. It is assumed that each of the mapper units 130-1 to 130-M is provided with only one mapper. For example, when a shift register is used as the mapper, the mapper unit 130-1 has a shift number “1” and the mapper unit 130-M has a shift number “M”.

  Further, the S/P conversion units 120-1 to M and the IFFT units 140-1 to 140-M perform the same functions as the S/P conversion unit 120 and the IFFT unit 140 of the first embodiment. However, mapper numbers (“1” to “M”) are input to the IFFT units 140-1 to 140-M as mapper information. Then, the peak power measuring unit 150 a measures the peak power of the signals input in parallel from the IFFT units 140-1 to 140-M, and transmits only the signal having the smallest peak power among them through the wireless transmission unit 160. ..

  FIG. 9 is a flowchart showing the flow of processing performed by the OFDM/xDSL transmission apparatus shown in FIG. First, the S/P converters 120-1 to 120-M convert serial format data into parallel symbols (step S351). Subsequently, the mapper units 130-1 to 130-M perform mapping on the parallel symbols (step S352) and send them to the IFFT units 140-1 to 140-M. Then, the IFFT units 140-1 to 140-M, which have received the parallel symbols from the mapper units 130-1 to 130-M, perform IFFT on the data string in which the parallel symbols and the mapper information are combined into one (step S353), and combine them. And outputs it to the peak power measuring unit 150a as M signals.

  When the peak power measuring unit 150a receives the signals mapped using the mappers {1} to {M} from the IFFT units 140-1 to 140-M, the peak power measuring unit 150a measures the peak powers of these signals (step S354). At this time, the peak power of the M signals may be measured in parallel by providing a plurality of CPUs, or may be sequentially measured by one CPU.

  As a result of the measurement by the peak power measuring unit 150a, when the signal (the signal using the mapper {2} in the example shown in FIG. 8) having the minimum peak power is obtained, the signal is wirelessly transmitted from the peak power measuring unit 150a. After being sent to the section 160, it is sent via the antenna 170. Further, as the receiving device corresponding to the case of using the transmitting device according to the present embodiment, the receiving device in the above-described first embodiment (see FIG. 6) can be used, and thus the description thereof will be omitted.

  According to the present embodiment described above, it is applicable to all multi-carrier modulation schemes, and in addition to the need for a phase rotation sequence requiring a large amount of memory, etc., before conversion by the conversion means, Since the parallel symbols are rearranged, the power can be effectively reduced. Moreover, since the processes from the parallelization of the input data to the measurement of the power can be performed in parallel, the processes can be performed at high speed.

[Third Embodiment]
In the above-described first and second embodiments, a mode has been described in which mapper information is input to the IFFT unit, the data is inserted into a predetermined position of the mapped data, and the data is transmitted. In the present embodiment, a mode will be described in which the mapper information is not inserted into a predetermined position of data but is inserted into a position corresponding to the used mapper.

  FIG. 10 is a functional block diagram showing a configuration of a transmitting apparatus according to Embodiment 3 of the present invention, and FIG. 11 is a functional block diagram showing a configuration of a receiving apparatus according to Embodiment 3 of the present invention. 10 and 11 show a mode in which the process of selecting the mapper is continuously performed so that the peak power of the data mapped as shown in FIG. 2 becomes small. Then, in the transmitting device according to the present embodiment, in addition to the transmitting device in the above-described first embodiment (see FIG. 2), instead of inserting the mapper information into the S/P converter 121, new mapper information is transmitted. The mapper selecting unit 111 is configured to send mapper information to the pilot inserting unit 135.

  In addition, in the receiving device according to the present embodiment, in addition to the receiving device in the first embodiment (see FIG. 6), a subcarrier power measuring unit for specifying the subcarrier in which the pilot is inserted in pilot inserting unit 135. (Individual power measuring means) 235 is further provided. The subcarrier power measuring unit 235 is configured to obtain the power of each subcarrier over one symbol of the OFDM signal. Further, unlike the above-described first embodiment, the mapper information extraction unit 241 is configured to receive the mapper information from the subcarrier power measurement unit 235, not from the P/S conversion unit 260, and notify the demapper unit 250 of it.

  12 and 13 are flowcharts showing the flow of processing performed by the OFDM/xDSL system transmitter shown in FIG. 2 and the OFDM/xDSL system receiver shown in FIG. 6, respectively. The flow of processing of transmission and reception of this embodiment is almost the same as that of the above-described first embodiment, and therefore detailed description thereof is omitted. The difference is that pilot insertion performed by pilot insertion section 135 during transmission (step S251 in FIG. 12) and subcarrier into which pilot performed by subcarrier power measurement section 235 during reception are specified, and mapper information is extracted. Processing (step S311 in FIG. 13) is newly added.

FIG. 14 is a schematic diagram showing pilot insertion performed by pilot inserting section 135. FIG. 14A shows one subcarrier before pilot insertion, and FIG. 14B shows one subcarrier after pilot insertion, and C ₁ , C _2, etc. represent one data. When the pilot insertion unit 135 receives the subcarrier shown in FIG. 14A from the mapper unit 130, for example, as shown in FIG. 14B, as a pilot between C _N and C ₁ , for example, “0” is input. ”Is inserted. The subcarriers inserted by the pilot inserting unit 135 indicate the mapper numbers used in the mapper unit 130, that is, mapper information. For example, when the shift register is used in the mapper unit 130 and the shift number is “2”, the pilot inserting unit 135 inserts the pilot into the second subcarrier. After that, the multi-carrier modulated signal subjected to IFFT in IFFT section 140 is transmitted from antenna 170.

  In the receiving device that has received the signal, subcarrier power measuring section 235 measures the power of each subcarrier and identifies the subcarrier in which the pilot (“0”) is embedded. This can be determined, for example, because the power of the subcarrier to which "0" is input is smaller than the power of the other subcarriers. The mapper information extraction unit 241 notifies the demapper unit 250 of the subcarrier number received from the subcarrier power measurement unit 235, and causes the demapper unit 250 to perform the demapper corresponding to the number. As a result, the data input to the transmission device 10 is reproduced.

  Although the present embodiment has been described as having a configuration in which the process of selecting mappers is successively continued as shown in FIG. 2, the embodiment of the present invention is not limited to this, and the mapping as shown in FIG. 8 is performed. It can also be applied to a configuration performed in parallel.

  According to the present embodiment described above, it is possible to send what is rearranged for parallel symbols as side information instead of directly inserting the data into the data. Information other than can be added. In particular, when pilot inserting section 135 inserts “0”, the power of the subcarrier in which the “0” is inserted is smaller than the power of other subcarriers. Therefore, the rearrangement can be specified by measuring the power of the subcarriers, and the identification at the time of the specification becomes easy.

[Embodiment 4]
In the first to third embodiments described above, the case where the functional unit that reduces the peak power is provided in OFDM/xDSL has been described, but in the present embodiment and the subsequent embodiments, the present invention is applied to MC-CDMA. The form will be described. Further, in the present embodiment, 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 S/P conversion unit 340 have a function as a parallelization unit. ..

  FIG. 15 is a functional block diagram showing the configuration of the transmission device according to the fourth embodiment of the present invention. Compared to the conventional transmission device shown in FIG. 31, the transmission device according to the present embodiment does not include a scramble information selection unit 990, but instead has a mapper selection unit 350, a mapper unit (order change unit) 360, and This is a configuration including a pilot inserting section (pilot inserting means) 365 for inserting mapper information used in the mapper section 360 into data. That is, the conventional transmission apparatus has a configuration in which the peak power is reduced by, for example, cyclically shifting the scramble code, but in the present embodiment, the scramble code is normally multiplied and the mapper unit 360 maps the data. What you do is different.

  FIG. 16 is a flowchart showing the flow of processing performed by the MC-CDMA transmission apparatus shown in FIG. First, the channelization code generation unit 310 generates a channelization code (step S401). The channelization code may be generated at any time when data is input, or may be stored in a ROM (Read Only Memory) or the like and read out from the ROM or the like at any time when data is input. ..

  Then, when data is input from a plurality of users, the spreading units 315-1 to 31-M receive the channelization code from the channelization code generating unit 310 and spread the data (step S402). The data spread in the spreading units 315-1 to M are subsequently multiplexed in the data multiplexing unit 320 (step S403). Next, the scramble code generated by the scramble code generation unit 325 and the data multiplexed by the data multiplexing unit 320 are multiplied by the scramble code multiplication unit 330 (step S404). Subsequently, the S/P conversion unit 340 converts the multiplied data received from the scramble code multiplication unit 330 from serial format to parallel format, and outputs it to the mapper section 360 (step S405).

  The process flow (step S406) of mapping the following data, inserting the used mapper information as a pilot, and transmitting a signal with a small peak power is the same as in FIG. ..

  FIG. 17 is a functional block diagram showing the configuration of the receiving apparatus according to the fourth embodiment of the present invention, and FIG. 18 is a flowchart showing the flow of processing performed by the receiving apparatus shown in FIG. The receiving apparatus according to this embodiment has a configuration including a despreading unit 270 in addition to the OFDM/xDSL system receiving apparatus shown in FIG. Therefore, only step S312 of FIG. 18 is newly added with the process of despreading the demapped data, and 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 value obtained by dividing the peak power by the average power. That is, for example, 10 [dB] on the horizontal axis indicates that the peak power is 10 times larger than the average power. Further, the vertical axis of this figure represents the probability that the peak power exceeds the PAPR value of the corresponding horizontal axis. The number of users is “16”, the spreading factor is “32”, and the number of subcarriers is “3/4” of the number of FFT points.

  In this figure, Nc represents the number of subcarriers. That is, in the present embodiment, the results are shown when 384, 192, and 96 subcarriers are used. The dotted line is the result when the conventional method that does not include the phase rotation series is used, 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, as the number of subcarriers increases, the number of subcarriers shifts to the right side of the figure, that is, the peak power increases. This is a common problem in PAPR, as described above.

Here, for example, when Nc=96 and the conventional case is compared with the present embodiment, in the conventional case, the probability that the PAPR exceeds 10 [dB] is about 10 ⁻² . That is, the peak power becomes about 10 times the average power about once in 100 times. On the other hand, in the present embodiment, the same probability of 10 ⁻² is achieved, and the PAPR is considerably reduced to about 8 [dB]. Also, it is understood that a large peak power reduction effect can be obtained according to the present embodiment also with the number of subcarriers other than this.

  Although the transmission device according to the present embodiment described above has the configuration in which the S/P conversion unit 340 is arranged immediately before the mapper unit 360, the embodiment of the present invention is not limited thereto, and the S/P conversion unit 340 may be, for example, Alternatively, a configuration may be employed in which the spreading units 315-1 to M are provided and the outputs from the spreading units 315-1 to M are already parallelized in the number corresponding to the number of subcarriers. In that case, it is not necessary to provide the S/P converter 340 at the position shown in FIG.

  In the transmission apparatus according to the present embodiment described above, it is described that mapping is performed in the mapper unit 360 after being multiplied by the scramble code in the scramble code multiplication unit 330 and before being input to the IFFT unit 370, as illustrated in FIG. 15. However, the embodiment of the present invention is not limited thereto. For example, as shown in FIG. 20, just before being multiplied by the scramble code in the scramble code multiplying unit 330, or after being transmitted from the channelization code generating unit 310 as shown in FIG. 21, the spreading code is spread by the spreading unit. The mapper unit 360 may be provided immediately before the operation. At this time, the mapper may be configured to perform mapping from the serial format to the serial format instead of mapping from the parallel format to the parallel format as described in the shift register of FIG.

[Fifth Embodiment]
In the above-described first to fourth embodiments, the transmission device is provided with the mapper unit, and the reception device is provided with the demapper unit. By changing the mapping in the mapper unit, a signal having a small peak power is transmitted and received. .. However, for example, when a standard is established for a wireless LAN or the like, it is not realistic to newly incorporate a mapper unit or the like into hardware such as a wireless LAN card. Therefore, in the present embodiment, a function unit having a mapping or demapping function is provided outside the hardware of a wireless LAN card, which is an example of a network interface card (NIC), so that signals with low peak power can be transmitted and received. A possible configuration will be described.

  FIG. 22 is a schematic diagram showing (a) a transmitter and (b) a receiver of a normal wireless LAN. First, in the transmission unit shown in FIG. 22A, the input data is subjected to error correction and packet/data consistency check in the transport layer. Then, the address of the destination and its own information (header information such as address) are added in the Internet layer. Then, the data is subjected to IFFT or the like in the wireless LAN card and sent as a transmission signal. In the receiving unit of FIG. 22B, which 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 transmitter and (b) a receiver of the wireless LAN according to the embodiment of the present invention. In the transmitting unit of FIG. 23A and the receiving unit of FIG. 23B, a transmission side mapper unit 400 (transmission auxiliary device) that is externally connected to a wireless LAN card or the like and enables transmission and reception of signals with low peak power. And a receiving side demapper unit (reception auxiliary device) 500, respectively.

  The transmitting side mapper unit 400 includes a mapper selecting unit 410, a mapper unit (order changing unit) 420, a lower layer emulation unit (reproducing unit) 430, a peak power measuring unit (power measuring unit) 440, and a data combining unit (combining unit and transmitting unit). Means) 450. First, the data input to the transmission side mapper unit 400 is sent to the mapper unit 420, where the mapper selected by the mapper selecting unit 410 performs mapping. This mapping rearranges the order of input data composed of serial symbols. Then, the data mapped in the mapper unit 420 and the mapper information representing the mapper used in the mapper unit 420 are sent to the data combining unit 450 and combined into one data string.

  Next, the data string combined by the data combining unit 450 is sent to the 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, and after the processing. The signal is sent to the peak power measuring section 440.

  Here, the lower layer emulation unit 430 is a functional unit that adds header information added in the Internet layer to the data string received from the data combining unit 450, and applies IFFT or the like performed in the wireless LAN card to the data string. Is. That is, the lower layer emulation unit 430 is a functional unit that faithfully reproduces the signal waveform when the data string sent from the data synthesis unit 450 is input to the transport layer and sent 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 of FIG.

  Therefore, the peak power measuring unit 440 is provided to reduce the peak power of the signal transmitted from the lower layer emulation unit 430, and the mapper that minimizes the peak power is provided as in the first to fourth embodiments. Perform selection processing. Then, the data string (data and mapper information) determined to have the minimum peak power is input from the data synthesizing unit 450 to the transport layer and sent from the wireless LAN card.

  At this time, when the peak power measuring unit 440 stores a predetermined threshold value and the peak power of the multicarrier modulation signal sent from the lower layer emulation unit 430 is equal to or less than the threshold value, the source of the multicarrier modulation signal is reduced. There is a mode in which the data string that has become is transmitted from the data synthesizing unit 450 to the transmitting device including the wireless LAN card. Also, unlike this, the peak power measuring unit 440 receives the multicarrier modulation signal, measures the power, compares the power with the minimum power up to now, and determines the source of the multicarrier modulation signal having the minimum power. The data string may be sequentially overwritten and stored in the data synthesizing unit 450. In this case, when the predetermined number of times (for example, i_{max} in the first embodiment) is reached, the data string stored in the data synthesizing unit 450 is transmitted to the transmitting device including the wireless LAN card.

  Subsequently, the receiving side demapper unit 500 shown in FIG. 23B includes a demapper selecting unit 510, a demapper unit (order recovery unit) 520, and a data separating unit (separating unit) 530. When the receiving unit of 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 transmitted to the Internet layer and the transport layer. It passes through and is input to the receiving side demapper unit 500 as a data string (data and mapper information).

  The data string input to the receiving side demapper unit 500 is first separated in the data separation unit 530 into the data output from the mapper unit 420 and the mapper information. Then, the data is sent to the demapper section 520, and the mapper information is sent to the demapper selecting section 510. Upon receiving the mapper information from the data separating unit 530, the demapper selecting unit 510 selects a demapper for returning (demapping) the mapper used in the mapper unit 420, and the demapper unit 520 selects the demapper according to the selected demapper. Cause demapping. The data decoded by the above processing is sent from the receiving side demapper unit 500, and the processing ends.

  FIG. 24 shows a case in which the number of interleavers as one form of the mapper included in the mapper unit is changed using the transmission unit according to the present embodiment and a conventional phase rotation sequence is used as the mapper included in the mapper unit, It is a figure which shows the PAPR characteristic when changing the number of rotation series. The horizontal axis of this figure is the PAPR value, which is the value obtained by dividing the peak power by the average power. Further, the vertical axis of this figure represents the probability that the peak power exceeds the PAPR value of the corresponding horizontal axis. The parameters used are in accordance with the standard of the wireless LAN standard IEEE802.11a, and the OFDM system is assumed.

In this figure, N _it represents the number of interleavers included in the mapper unit 420, and M represents the number of phase rotation sequences. That is, the present embodiment shows the result when 1, 2, 4, 8 or 16 interleavers or phase rotation sequences are used. Further, the line with a symbol such as ● (black circle) is the result according to the embodiment of the present invention, and the line without the symbol is the result using the conventional phase rotation sequence.

  The predetermined threshold value stored in the peak power measuring 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 the data string. It is transmitted from the synthesizing unit 450 to a transmitting device including a wireless LAN card.

  As can be seen from FIG. 24, the transmitting unit according to the present embodiment exhibits the PAPR characteristic equivalent to that of the conventional system. The conventional method using the phase rotation sequence requires multiplication of complex numbers, but according to the present invention, multiplication of complex numbers is unnecessary. 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 ([MHz] unit) of the input data, and the vertical axis is the relative spectral power density ([dB] unit). The parameters used are in accordance with the standard of the wireless LAN standard IEEE802.11a, and the OFDM system is assumed.

In this figure, N _it represents the number of interleavers included in the mapper unit 420, and IBO is the input backoff to the nonlinear amplifier. For example, IBO=3 [dB] means that, of the power input to the non-linear amplifier, a power portion larger than the average power by 3 [dB] or more is cut. In addition, in this figure, a curve described as a spectrum mask represents the upper limit of the relative spectrum power density defined by the IEEE802.11a standard. In other words, the product conforming to the IEEE802.11a standard must have the relative spectral power density below (smaller in value) than this spectrum mask in all frequency regions. Furthermore, the curve marked as a linear amplifier shows the result when the power input to the amplifier is not cut and is input as it is.

As can be seen from this figure, according to the present invention, even if the number of interleavers (N _it ) is as small as 2 or 4, the out-of-band radiation is 2 to 3 [dB] compared to the result of the normal OFDM system. ] The degree can be suppressed.

  According to the present embodiment described above, the present invention is applicable to general multi-carrier modulation schemes, does not require a phase rotation sequence or the like that requires a large amount of memory, and also converts to a multi-carrier modulation signal. Since the parallel symbols are rearranged before, the power can be effectively reduced. Further, when the multi-carrier modulated signal is transmitted as soon as the power becomes equal to or lower than the threshold value, the processing can be performed at high speed. On the other hand, in the case of transmitting a multi-carrier modulated signal having the minimum power until reaching a predetermined number of times, the power can be reduced more reliably. Furthermore, since the waveform output from the wireless LAN card is faithfully reproduced, the power of the transmission signal can be surely reduced.

[Other Preferred Embodiments]
(A) In the embodiment described above, the shift register is mainly used as the mapper included in the mapper unit 130, but the embodiment of the present invention is not limited thereto. For example, the following interleaver and block interleaver, etc. Can be used.

FIG. 26 is a schematic diagram for explaining the function of an interleaver used as a mapper. The input data {d ₁ , d ₂ , d ₃ ,..., D _N } parallelized in the S/P converter is a pseudo-random number generator generated by a pseudo-random number generator included in the interleaver. It is output after being sorted in order.

FIG. 27 is a schematic diagram showing an embodiment of the pseudo random number generating means provided in the interleaver. In order to generate a pseudo random number, a primitive polynomial h(x) is prepared, and a shift register that performs processing according to the polynomial is configured. Here, when the number to be input is N, the degree D of the primitive polynomial is determined as satisfying N≦2 ^D −1. Now, if the numbers "1" to "6" are rearranged, N=6, so D may be an integer of 3 or more. Here, a shift register in the case where D=3 and the primitive polynomial is h(x)=1+x+x ³ is shown. Then, by operating the shift register 2 ^D −1 times, a sequence of pseudo random numbers in which the input numbers are rearranged can be obtained.

  First, an initial value equal to or less than N is selected, and a binary representation of the initial value is input to the shift register. Here, since the initial value is set to "1", "0"-"0"-"1" in which "1", which represents the initial value in binary number, is represented by 3 bits, is set as R1, It is input at the positions of R2 and R3. Subsequently, in the second processing, “0” of R1 is shifted to R2, and “0” of R2 is shifted to R3. Further, "0" of R1 is added with "1" of R3 in mod2 (addition modulo 2), and the result is input to R1. Here, in the addition in mod2, 1+1=0, 1+0=1, 0+0=0, so that “1”, which is the result of addition of “0” of R1 and “1” of R3, is input to R1. It This is the second processing.

The above process is repeated up to 7 (=2 ³ −1) times, and the numbers obtained so far are displayed in decimal. The numbers obtained from the first time to the seventh time in decimal notation are shown in {} in FIG. By arranging these numbers in order from the first time and removing the number 7 larger than N (=6), a sequence of pseudo random numbers "1, 4, 6, 3, 5, 2" is obtained. In the above embodiment, the primitive polynomial and the initial value can be arbitrarily selected, and in that case, a sequence different from the above sequence of pseudo-random numbers will be obtained.

  The method using the interleaver as described above when rearranging data and subcarriers has an advantage that a required storage capacity and the like can be smaller than methods such as the linear congruential method. For example, when rearranging 31 subcarriers, it is necessary to use a 32-bit integer in the linear congruential method and to add or multiply the integer. On the other hand, when the interleaver is used, if the state is represented by 5 bits and the number of connections is 5, it is sufficient that the logarithmic function (log) whose base is 2 has a storage capacity of about log 31. ..

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 in the memory in the direction (the direction from the top to the bottom) drawn by the dotted arrow in the figure. Then, when outputting the data, the data is read from the memory in the direction (the direction from left to right in the figure) drawn by the solid arrow. As a result, output data {d ₁ , d _r+1 , d _2r+1 ,..., d _N−r , d _N } is obtained.

  The shift register shown in FIG. 3, the interleaver shown in FIG. 26, the block interleaver shown in FIG. 28, and the like in the end have the function of obtaining and outputting various permutations of the input number sequence. Are common. Therefore, it is possible to construct a general-purpose mapper having all the functions of the above mapper. Further, the mapper according to the embodiment of the present invention may be configured by hardware, and is configured by software having a function of, for example, a CPU or the like, obtaining a permutation of input data and outputting the result. May be.

  (B) In the above-described embodiment, the peak power measuring unit calculates the instantaneous value of the peak power and transmits the signal having the minimum value. However, the embodiment of the present invention is not limited thereto, and the peak power is not limited thereto. The measuring unit 150 may be configured to obtain the excess power. FIG. 29 is a schematic diagram for explaining excess power. The vertical axis of the figure is the instantaneous power, and the horizontal axis is the time. In addition, a waveform for one symbol is drawn in the figure. As shown in this figure, the excess power is the sum of the powers of the signal components that are x [dB] or more from the average power. This x may be selected so that the excess power correctly reflects the total power of one symbol, and for example, a value of about 3 [dB] is selected. As described above, since the excess power is the total power, the transmission power is effectively reduced.

  (C) In the embodiment described above, the mapper provided in the mapper unit is described as being, for example, only a shift register, but the embodiment of the present invention is not limited to this, and a plurality of different mappers are provided. May be. FIG. 30 is a schematic diagram showing a configuration of a mapper unit provided with a plurality of mappers. In the case of this mode, 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 performs mapping on the data using the selected mapper. Therefore, the mapper information sent out by the mapper selection unit may include not only which mapper has been selected, but also the number of shifts when a shift register is selected, for example.

  (D) In the above-described embodiment, it is described that only one mapper unit is provided to perform data mapping, but the embodiment of the present invention is not limited to this, and a shift register or the like may be provided upstream or downstream of the mapper unit. It is also possible to further provide hardware and perform cyclic shift or the like. At this time, the hardware such as the shift register may be arranged immediately before or after the mapper section, or may be arranged at any distant position before or after the mapper section. As a result, it is possible to realize a function equivalent to the case where a plurality of mappers are provided and to effectively reduce the peak power, as compared with the case where only the mapper provided in the mapper unit is provided.

  (E) In the embodiment described above, the peak power of the signal subjected to IFFT in the IFFT unit is measured and, for example, the mapper having the smallest peak power is selected, but the embodiment of the present invention is described. Is not limited to that. For example, as shown in FIG. 31, a predetermined vector is used before IFFT in the IFFT unit 142, and the inner product of the vector and the parallel symbol input to the IFFT unit is calculated. The inner product calculation unit (inner product calculation means) 180 for obtaining Then, the power measuring unit (power measuring means) 152 selects the mapper having the smallest numerical value corresponding to the peak power. In addition, for the predetermined vector, for example, learning algorithm such as SVM (Support Vector Machine) or genetic algorithm is used to perform pre-learning on almost random data or the like so that the peak power after inner product calculation becomes small. Can be obtained.

  After the predetermined vector is obtained, the mapper unit 132 performs mapping using different mappers on the data, and sequentially performs a process of obtaining the inner product of the mapped data and the vector. The configuration may be such that the mapper having the smallest numerical value corresponding to the resulting peak power is selected, or the mapper is selected when the numerical value corresponding to the peak power falls below a predetermined threshold value. May be. Further, for example, as shown in FIG. 8, the inner product of the mapped data and a predetermined vector is performed in parallel, and the mapper that has the smallest numerical value corresponding to the resulting peak power is selected. It may be configured to. However, in this case, unlike the one shown in FIG. 8, it is not necessary to provide a plurality of IFFT units. In either case, when the mapper that is supposed to have the smallest peak power is selected, the data mapped using the mapper is sent to the IFFT unit. Then, it is converted into a multi-carrier modulated signal and transmitted from the wireless transmission unit.

  Further, unlike the above, the inner product computing unit may be configured to have a plurality of predetermined vectors. In this case, for example, the inner product of a plurality of differently mapped data and the first vector is calculated, and the numerical value corresponding to the peak power as a result is stored for each data. Subsequently, the inner product of the data subjected to the plurality of different mappings and the second vector is calculated, and the numerical value corresponding to the peak power as a result is stored for each data. Then, for example, for each data, the average of the numerical values obtained as a result of the inner product with the first and second vectors is averaged, and the mapper used for the data having the smallest value may be selected. Alternatively, it is possible to prepare three or more vectors and select the mapper used for the data having the smallest number corresponding to the peak power obtained as a result of the inner product with the vectors. ..

  Therefore, according to the present embodiment, it is possible to select a mapper with a small peak power without performing IFFT that requires a large amount of calculation a plurality of times, and thus it is possible to reduce the calculation time.

  (F) In the third and fourth embodiments described above, when the mapper information is provided as the side information, "0" is inserted in one location of the subcarrier, but the embodiments of the present invention are not limited thereto. Instead, the configuration may be such that "0" is inserted at two or more arbitrary positions within the same subcarrier. In this case, the identification rate is higher than in the case where the signal is inserted at one location, so that the certainty of restoring the received signal can be further increased. Further, the value to be inserted may be a value other than "0". In particular, in that case, it is preferable to insert a relatively large value because the identification rate at the time of identifying the subcarriers in the subcarrier power measuring unit increases.

[Outline of Embodiment]
The outline of the embodiment according to the present invention will be described below.

  (1) As described above, the transmission apparatus according to the present invention has a parallelization means for converting input data into parallel symbols, an order changing means for rearranging the order of the parallel symbols, and at least an order changing means for changing the order. Converting the data sequence including the rearranged parallel symbols, converting means for generating a multi-carrier modulated signal, and measuring the power of a predetermined format of the multi-carrier modulated signal generated by the converting means, and the power is preset. A power measuring unit that determines whether or not the power is greater than a set threshold value, and when the power is determined by the power measuring unit to be greater than the threshold value, the order changing unit is controlled to change the order of the parallel symbols. Control means for rearranging again, controlling the converting means to generate a multicarrier modulated signal from the parallel symbol, and controlling the power measuring means to measure the power of the predetermined format of the multicarrier modulated signal. And a transmitting unit that transmits the multicarrier modulated signal when the power is determined to be equal to or lower than the threshold value by the power measuring unit before the series of processes by the control unit reaches a predetermined number of times. Preferably.

According to this configuration, after the input data is converted into the parallel symbols by the parallelizing means, the order is rearranged by the order changing means. Here, the number of parallelizations is equal to the number of subcarriers (subcarriers), and the parallel symbols are put on the respective subcarriers. Further, the order can be rearranged arbitrarily, for example, {d ₁ , d ₃ , d ₂ }, {d ₂ , d ₁ , d ₃ } when the parallel symbols are {d ₁ , d ₂ , d ₃ }. I don't mind. The order is rearranged in this way in order to reduce the power of a predetermined format when converted into a multi-carrier modulated signal by the conversion means after that, and the power is greatly changed by the rearrangement. Further, the power of a predetermined format includes, for example, peak power, average power, excess power, and the like.

  Then, when it is determined that the power measured by the power measuring means is larger than the preset threshold value, there is a problem such as a short communication distance when transmitted as it is, so that the power becomes smaller again. The order changing means rearranges the order of the parallel symbols to generate a multicarrier modulation signal and measure the power. This series of processes is continued until the electric power becomes equal to or less than the threshold value. However, the upper limit of the number of times is set, and the processing is set not to continue beyond the number of times. Then, when the power measuring means determines that the power has become equal to or less than the threshold value, the multicarrier modulated signal is transmitted from the transmitting device by the transmitting means.

  INDUSTRIAL APPLICABILITY The present invention can be applied to general multi-carrier modulation schemes, and does not require a phase rotation sequence that requires a large amount of memory. Moreover, 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 becomes equal to or lower than the threshold value, the processing can be performed at high speed.

  (2) As described above, in the transmitting apparatus according to the present invention, the parallelizing means for converting the input data into parallel symbols, the order changing means for rearranging the order of the parallel symbols, and the order changing means for at least the order changing means. Converting the data sequence containing the rearranged parallel symbols, converting means for generating a multi-carrier modulated signal, and measuring the power of a predetermined format of the multi-carrier modulated signal generated by the converting means, the minimum power A power measuring unit that sequentially stores the multi-carrier modulated signal that is provided and a rearrangement unit that rearranges the order of the parallel symbols by controlling the order changing unit, and controls the converting unit to generate a multi-carrier modulated signal from the parallel symbols. Control means for controlling the power measuring means to measure the power of the predetermined format of the multi-carrier modulated signal, and the power measuring means when a series of processes by the control means reaches a predetermined number of times. And transmitting means for transmitting the multi-carrier modulated signal stored in.

According to this configuration, after the input data is converted into the parallel symbols by the parallelizing means, the order is rearranged by the order changing means. Here, the number of parallelizations is equal to the number of subcarriers, and the parallel symbol is put on each subcarrier. Further, the order can be rearranged arbitrarily, for example, {d ₁ , d ₃ , d ₂ }, {d ₂ , d ₁ , d ₃ } when the parallel symbols are {d ₁ , d ₂ , d ₃ }. I don't mind. The order is rearranged in this way in order to reduce the power of a predetermined format when converted into a multi-carrier modulated signal by the conversion means after that, and the power is greatly changed by the rearrangement. Further, the power of a predetermined format includes, for example, peak power, average power, excess power, and the like.

  Then, when the power measuring means measures the power, the power measuring means compares the power with the minimum power so far, and sequentially stores the multicarrier modulation signal having the minimum power. After that, the control means rearranges the order of the parallel symbols by the order changing means again so as to obtain smaller power, generates the multicarrier modulation signal, and measures the power. This series of processes is continued until the predetermined number of times. Then, when the predetermined number of times is reached, the multi-carrier modulated signal having the minimum power stored in the power measuring means is transmitted from the transmitting device by the transmitting means.

  INDUSTRIAL APPLICABILITY The present invention can be applied to general multi-carrier modulation schemes, and does not require a phase rotation sequence that requires a large amount of memory. Moreover, since the parallel symbols are rearranged before the conversion by the conversion means, the power can be effectively reduced. Furthermore, since the multi-carrier modulated signal having the minimum power until reaching the predetermined number of times is transmitted, the power can be reduced more reliably.

  (3) As described above, the transmission apparatus according to the present invention has a parallelization unit that converts input data into parallel symbols, an order changing unit that changes the order of the parallel symbols, and at least an order changing unit that changes the order. And a conversion means for converting a data sequence including the rearranged parallel symbols to generate a multi-carrier modulated signal, and each of the order changing means is arranged in a different order. Power measuring means for measuring the power of a predetermined format of the multi-carrier modulated signal generated by the converting means, and selecting one set having the multi-carrier modulated signal with the minimum power. And transmitting means for transmitting the set of multi-carrier modulated signals selected by the power measuring means.

According to this configuration, after the input data is converted into the parallel symbols by the parallelizing means, the order is rearranged by the order changing means. Here, the number of parallelizations is equal to the number of subcarriers, and the parallel symbol is put on each subcarrier. Further, the order can be rearranged arbitrarily, for example, {d ₁ , d ₃ , d ₂ }, {d ₂ , d ₁ , d ₃ } when the parallel symbols are {d ₁ , d ₂ , d ₃ }. I don't mind. However, each order changing means is configured to perform a different rearrangement.

  The order is rearranged in this way in order to reduce the power of a predetermined format when converted into a multi-carrier modulated signal by the conversion means after that, and the power is greatly changed by the rearrangement. Further, the power of a predetermined format includes, for example, peak power, average power, excess power, and the like. Then, the power measuring means measures the power of the multicarrier modulated signal received from the plurality of converting means, and the transmitting means transmits the multicarrier modulated signal having the smallest power from the transmitting device.

  INDUSTRIAL APPLICABILITY The present invention can be applied to general multi-carrier modulation schemes, and does not require a phase rotation sequence that requires a large amount of memory. Moreover, since the parallel symbols are rearranged before the conversion by the conversion means, the power can be effectively reduced. Furthermore, since the processes from the parallelization of input data to the measurement of power can be performed in parallel, the processes can be performed at high speed.

  (4) As described above, in the transmitting apparatus according to the present invention, the parallelizing means for converting the input data into parallel symbols, the order changing means for rearranging the order of the parallel symbols, and the order changing means for arranging the order. An inner product calculating means for calculating a numerical value corresponding to electric power of a predetermined format by taking an inner product of the changed parallel symbols and a predetermined vector, and a numerical value calculated by the inner product calculating means is larger than a preset threshold value. Power measuring means for determining whether or not, and when the power measuring means determines that the calculated numerical value is larger than the threshold value, the order changing means is controlled to rearrange the order of the parallel symbols. Then, the inner product calculating means is controlled to calculate the inner product of the parallel symbol and the predetermined vector to calculate a numerical value corresponding to the power of the predetermined format, and the power measuring means is controlled to calculate the calculated numerical value. Is determined to be equal to or less than the threshold value, before the control means for determining whether or not is greater than the threshold value and the series of processes by the control means reaches a predetermined number of times. In this case, at least the conversion means for converting the data sequence including the parallel symbols rearranged in order by the order changing means to generate a multicarrier modulation signal, and the multicarrier modulation signal generated by the conversion means are transmitted. It is preferable to provide a transmitting means for performing.

  According to this configuration, the inner product calculating unit calculates the inner product of the parallel symbols whose order has been rearranged by the order changing unit and the predetermined vector, and calculates, for example, a numerical value corresponding to the peak power. Therefore, it is possible to select the rearrangement with which the peak power is reduced by the power measuring means without performing the IFFT that requires a large amount of calculation a plurality of times, and thus the calculation time can be reduced. For this vector, for example, a learning algorithm such as SVM (Support Vector Machine) or a genetic algorithm is used to perform pre-learning on almost random data, and the numerical value calculated by the inner product calculation is the peak power. It can be obtained by making it reflect.

  Then, if it is determined by the power measuring means that the numerical value corresponding to the peak power is larger than the preset threshold value, there is a problem that the communication distance is shortened if it is transmitted as it is, so that the power may be reduced. The order of the parallel symbols is rearranged again by the order changing means, and the numerical value corresponding to the peak power is calculated. This series of processes is continued until the numerical value corresponding to the peak power falls below the threshold value. However, the upper limit of the number of times is set, and the processing is set not to continue beyond the number of times. Then, when the power measuring means determines that the numerical value corresponding to the peak power becomes less than or equal to the threshold value, the parallel symbol having at least the numerical value is converted into the multi-carrier modulated signal by the converting means and transmitted from the transmitting device by the transmitting means. To be done.

  According to the present invention, since a numerical value corresponding to, for example, peak power is calculated by taking an inner product with parallel symbols, a rearrangement that reduces peak power is selected without performing IFFT that requires a large amount of calculation multiple times. Therefore, the calculation time can be reduced. Further, since the multicarrier modulation signal is transmitted as soon as the numerical value corresponding to the power becomes equal to or less than the threshold value, the processing can be performed at high speed.

  (5) As described above, in the transmitting apparatus according to the present invention, the parallelizing means for converting the input data into parallel symbols, the order changing means for rearranging the order of the parallel symbols, and the order changing means for arranging the order. The inner product calculating means for calculating the numerical value corresponding to the electric power of the predetermined format by taking the inner product of the changed parallel symbols and the predetermined vector, and the parallel symbol having the minimum numerical value calculated by the inner product calculating means The power measuring means for storing sequentially and the order changing means are controlled to rearrange the order of the parallel symbols again, and the inner product calculating means is controlled to take an inner product of the parallel symbols and the predetermined vector. Control means for calculating a numerical value corresponding to electric power of the form, controlling the electric power measuring means to store the parallel symbol having the minimum calculated numerical value, and a series of processing by the control means a predetermined number of times. At least, the conversion means for converting the data sequence containing at least the parallel symbols stored by the power measuring means to generate a multicarrier modulation signal, and the multicarrier modulation signal generated by the conversion means. It is preferable to provide a transmitting means for transmitting.

  According to this configuration, the inner product calculating unit calculates the inner product of the parallel symbols whose order has been rearranged by the order changing unit and the predetermined vector, and calculates, for example, a numerical value corresponding to the peak power. Therefore, it is possible to select the rearrangement with which the peak power is reduced by the power measuring means without performing the IFFT that requires a large amount of calculation a plurality of times, and thus 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. After that, the control means rearranges the order of the parallel symbols by the order changing means again so that a smaller power can be obtained, and the numerical value corresponding to the peak power is calculated and compared with the minimum value so far. This series of processes is continued until the predetermined number of times. Then, when the predetermined number of times is reached, the parallel symbol having at least the numerical value is converted into the multi-carrier modulated signal by the converting means, and is transmitted from the transmitting device by the transmitting means.

  According to the present invention, the inner product of the parallel symbols is taken to calculate the numerical value corresponding to the peak power, for example, so that the rearrangement that reduces the peak power is selected without performing the IFFT that requires a large amount of calculation a plurality of times. Therefore, the calculation time can be reduced. Further, since the multi-carrier modulated signal having the minimum power until reaching the predetermined number of times is transmitted, the power can be reduced more reliably.

  (6) As described above, the transmitting apparatus according to the present invention is configured to include 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. Further, each of the order changing means performs rearrangement in a different order, and at least one of them is provided, and an inner product of a parallel symbol and a predetermined vector whose order is changed by the order changing means is provided. An inner product calculating means for calculating a numerical value corresponding to a predetermined format of electric power, a power measuring means for judging the smallest numerical value among the numerical values calculated by the inner product calculating means, and at least a minimum value by the power measuring means. A conversion means for converting a data string including the parallel symbol having a numerical value determined to be, and generating a multicarrier modulation signal; and a transmission means for transmitting the multicarrier modulation signal generated by the conversion means. Is preferred.

  According to this configuration, the inner product calculating unit calculates the inner product of the parallel symbols whose order has been rearranged by the order changing unit and the predetermined vector, and calculates, for example, a numerical value corresponding to the peak power. At this time, at least one inner product calculating means may be provided, and the inner product with the parallel symbol from the sequential order changing means may be taken, or the same number as the parallelizing means and the order changing means may be provided. The inner product with the parallel symbol from the order changing means may be taken in parallel. By this means, it is possible to select the rearrangement with which the peak power is reduced by the power measuring means without performing the IFFT that requires a large amount of calculation a plurality of times, and thus it is possible to reduce the calculation time. Then, the power measuring means compares the numerical values corresponding to the peak powers received from the plurality of inner product calculating means, and determines which of the parallel symbols has the smallest value among them. Then, at least the parallel symbol is converted into a multicarrier modulated signal by the conversion means, and is transmitted from the transmission device by the transmission means.

  According to the present invention, the inner product of the parallel symbols is taken to calculate the numerical value corresponding to, for example, the peak power. Therefore, the rearrangement that reduces the peak power is selected without performing IFFT that requires a large amount of calculation a plurality of times. Therefore, the calculation time can be reduced. Further, when the same number of inner product calculating means as the parallelizing means and the order changing means are provided, the processes from parallelization of the input data to calculation of the numerical value corresponding to the electric power can be performed in parallel, so that it is faster. Can be processed.

  (7) The transmitter is any one of the transmitters (1) to (6), and the power of the predetermined format is preferably peak power. According to this configuration, the power measuring unit measures the peak power, which is the power at the position (peak) where the amplitude is largest, of the power that is the square of the amplitude of the multicarrier modulation signal. According to the present invention, since the peak power, which is the largest power of the instantaneous power, is measured, it is easy to detect the difference in power between the multi-carrier modulation signals, and it is possible to efficiently transmit a signal with low power. ..

  (8) The transmitting device is any one of the transmitting devices (1) to (6), and the power in the predetermined format is a sum of powers equal to or more than a power value obtained by adding a predetermined value to the average power. It is preferably electric power. According to this configuration, the power measuring means evaluates the sum of powers equal to or higher than the predetermined power value, so that the magnitude of the power can be effectively evaluated without being affected by the instantaneous fluctuation of the multicarrier modulation signal. it can. Further, 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.

  (9) The transmitter is any one of the transmitters (1) to (8), and it is preferable that the order changing unit uses a shift register. According to this configuration, the shift register, which has 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. It will be possible.

  (10) The transmitter is any one of the transmitters (1) to (9), and it is preferable that the conversion unit generate a multicarrier modulated signal by using an inverse fast Fourier transform. According to this configuration, a general-purpose fast Fourier inverse transform is used when converting parallel symbols in the frequency domain (amplitude vs. frequency) into a multi-carrier modulated signal in the time domain (amplitude vs. time). Therefore, the system configuration is simplified and the manufacturing cost can be suppressed.

  (11) The transmitting device is any one of the transmitting devices (1) to (10), wherein the parallel symbol is an I channel that is two orthogonal components obtained by modulating a carrier wave having a phase difference of 90 degrees. And Q channel, and it is preferable that the order changing means performs different rearrangement on the I channel and the Q channel. According to this configuration, the order changing unit does not perform one rearrangement on the parallel symbols, but performs different rearrangement on the I channel and the Q channel which are two orthogonal components. 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.

  (12) The transmitting device is any one of the transmitting devices (1) to (11), and the transmitting device cyclically moves to the parallel symbol before or after the order of the parallel symbols is rearranged by the order changing unit. It is preferable to shift.

  According to this configuration, after the parallel symbols are cyclically shifted, the order of the parallel symbols is rearranged by the order changing means, or after the order of the parallel symbols is rearranged by the order changing means. Whether or not the parallel symbols are cyclically shifted by. Usually, a shift register provided for performing a cyclic shift has a simple structure and is used for general purposes, and thus the price is low. Therefore, with the above configuration, it is possible to realize a function equivalent to a plurality of order changing means without providing a plurality of order changing means, so that it is possible to effectively reduce the power of the multi-carrier modulation signal and at the same time, reduce the cost. Can be kept low.

  (13) The transmitting device is any one of the transmitting devices (1) to (12), and the data string to be converted by the converting unit is a parallel symbol whose order is rearranged by the order changing unit. And information on the rearrangement of the order performed by the order changing means. According to this configuration, since the information of the rearrangement of the order is also collected in the data string together with the parallel symbols, it is possible to perform the re-conversion to the data string in the receiving device that has received the multicarrier modulation signal obtained by converting the data string. , You can easily retrieve the information of the order rearrangement. Therefore, it is possible to restore the input data to the transmitting device from the data string by using the information on the rearrangement of the order.

  (14) The transmitting device is any one of the transmitting devices (1) to (12), wherein the information on the rearrangement of the order performed by the order changing unit is rearranged by the order changing unit. The conversion means further comprises pilot insertion means for inserting into one symbol included in the parallel symbols, the symbol being located at a position corresponding to the rearrangement information of the order, and the conversion means arranges the order by the pilot insertion means. It is preferable to convert the parallel symbol in which the replacement information is inserted to generate the multicarrier modulation signal.

According to this configuration, the pilot 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. Here, the original parallel symbols are {d ₁ , d ₂ , d ₃ } and, for example, after being rearranged, {1}={d ₁ , d ₃ , d ₂ }, {2}={ d ₂ , d ₁ , d ₃ } and the like. In this case, the information on the rearrangement of the order is the number {1} when the arrangement of the parallel symbols after rearrangement is {d ₁ , d ₃ , d ₂ }, and {d ₂ , d ₁ , d _In the case of ₃ }, the number is {2}. According to the present invention, it is possible to transmit side information other than data, instead of directly inserting in the data what sort of rearrangement has been performed on parallel symbols. Information can be added.

(15) It is preferable that the transmitting device is the transmitting device (14), and that the information that can be specified by the pilot inserting means to specify the rearrangement is a zero value. According to this configuration, for example, the original parallel symbol is {d ₁ , d ₂ , d ₃ } and after rearrangement, {2}={d ₂ , d ₁ , d ₃ } To do. Here, {2} indicates the number of the rearrangement performed by the order changing means, that is, the second type of rearrangement has been performed. In this case, the pilot inserting means inserts a zero value (the number "0") in the second symbol, which is the position corresponding to the information of the rearrangement of the order.

  According to the present invention, a zero value is inserted in a symbol at a position corresponding to information that can specify what sort of parallel symbol has been rearranged, so that the power of the symbol is the power of another symbol. Will be smaller than. Therefore, it becomes possible to specify the rearrangement by measuring the power of the symbols, and it becomes easy to identify the rearrangement.

  (16) As described above, the transmission auxiliary device according to the present invention is a transmission auxiliary device that can be connected to a transmission device including at least a network interface card and can send a digital signal to the transmission device, and is a serial symbol. Composed of the order changing means for rearranging the order of the input data, the serial symbols rearranged in order by the order changing means, and the information for rearranging the order performed by the order changing means to form one data string. And a data string synthesized by the synthesizing means, and reproduces and outputs a multi-carrier modulated signal output when the data string is input to a transmitter including the network interface card. Reproducing means, power measuring means for measuring the power of a predetermined format of the multi-carrier modulated signal output by the reproducing means, and determining whether the power is larger than a preset threshold value, and the power measuring means. When it is determined that the power is greater than the threshold value by, by controlling the reordering means to rearrange the order of the serial symbols again, by controlling the conversion means to multi-carrier modulated signal from the serial symbol. Control means for generating and controlling the power measuring means to measure the power of the predetermined format of the multi-carrier modulated signal; and the power measuring means before a series of processing by the control means reaches a predetermined number of times. It is preferable that the transmitting means transmits the data string generated by the combining means to the transmitting device including the network interface card as the digital signal when the power is determined to be equal to or less than the threshold value.

According to this configuration, the input data consisting of serial symbols is rearranged in order by the order changing means before being converted into the multicarrier modulation signal. This is because, for example, when the serial symbols are {d ₁ , d ₂ , d ₃ }, {1}={d ₁ , d ₃ , d ₂ }, {2}={d ₂ , d ₁ , d ₃ }, etc. may be rearranged arbitrarily. Here, {1} and {2} are examples of the information of the rearrangement of the order performed by the order changing means, and the information and the serial symbol are combined into one data string by the combining means.

  Subsequently, the reproduction means reproduces and outputs the multicarrier modulation signal output when the data string is input to the transmission device including the network interface card. Then, the power measuring means receives the multi-carrier modulated signal, measures the power, and if the measured power is determined to be larger than a preset threshold, the communication distance is shortened if it is transmitted as it is. Therefore, the order of the serial symbols is rearranged again by the order changing means so that the power becomes smaller, and the multicarrier modulated signal is generated and the power is measured. This series of processing is continued until the electric power becomes less than or equal to the threshold value. However, the upper limit of the number of times is set, and the processing is set not to continue beyond the number of times. Then, when the power measuring unit determines that the power has become less than or equal to the threshold value, the data string that is the source of the multicarrier modulation signal is transmitted as a digital signal to the transmitting device including the network interface card by the combining unit. ..

  INDUSTRIAL APPLICABILITY According to the invention of the present application, it is applicable to general multi-carrier modulation schemes, and in addition to the need for a phase rotation sequence requiring a large amount of memory, it is possible to perform serial conversion before conversion into a multi-carrier modulation signal. Since the symbols are rearranged, the power can be effectively reduced. Further, since the multi-carrier modulation signal is transmitted as soon as the power becomes equal to or lower than the threshold value, the processing can be performed at high speed. Furthermore, since the waveform output from the network interface card is reproduced, the power of the transmission signal can be reduced with high accuracy.

  (17) As described above, the transmission auxiliary device according to the present invention is a transmission auxiliary device that can be connected to a transmission device including at least a network interface card and can send a digital signal to the transmission device. Composed of the order changing means for rearranging the order of the input data, the serial symbols rearranged in order by the order changing means, and the information for rearranging the order performed by the order changing means to form one data string. And a data string synthesized by the synthesizing means, and reproduces and outputs a multi-carrier modulated signal output when the data string is input to a transmitter including the network interface card. Reproducing means, measuring the power of a predetermined format of the multi-carrier modulated signal output by the reproducing means, when the multi-carrier modulated signal having the minimum power is detected, the combining means of the multi-carrier modulated signal A power measuring unit that stores the original data string and the order changing unit are controlled to rearrange the order of the serial symbols, and the reproducing unit is controlled to generate a multicarrier modulation signal from the serial symbols. Control means for controlling the power measuring means to measure the power of the predetermined format of the multi-carrier modulated signal, and when the series of processing by the control means reaches a predetermined number of times, the combining means It is preferable to include a transmitting unit that transmits the stored data string as the digital signal to a transmitting device including the network interface card.

According to this configuration, the input data consisting of serial symbols is rearranged in order by the order changing means before being converted into the multicarrier modulation signal. This is because, for example, when the serial symbols are {d ₁ , d ₂ , d ₃ }, {1}={d ₁ , d ₃ , d ₂ }, {2}={d ₂ , d ₁ , d ₃ }, etc. may be rearranged arbitrarily. Here, {1} and {2} are examples of the information of the rearrangement of the order performed by the order changing means, and the information and the serial symbol are combined into one data string by the combining means.

  Subsequently, the reproduction means reproduces and outputs the multicarrier modulation signal output when the data string is input to the transmission device including the network interface card. Then, the power measuring means receives the multi-carrier modulation signal, measures the power, compares the power with the minimum power up to now, and is the data sequence which is the source of the multi-carrier modulation signal having the minimum power. Are sequentially overwritten on the synthesizing means and stored. After that, the control means rearranges the order of the serial symbols again by the order changing means so as to obtain smaller power, generates the multicarrier modulation signal, and measures the power. This series of processes is continued until the predetermined number of times. Then, when the predetermined number of times is reached, the data sequence which is the source of the multi-carrier modulated signal having the minimum power stored in the synthesizing means is transmitted as a digital signal to the transmitting device including the network interface card.

  INDUSTRIAL APPLICABILITY The present invention can be applied to general multi-carrier modulation schemes, and does not require a phase rotation sequence that requires a large amount of memory. Moreover, since the serial symbols are rearranged before conversion into the multi-carrier modulated signal, the power can be effectively reduced. Furthermore, since the multi-carrier modulated signal having the minimum power until reaching the predetermined number of times is transmitted, the power can be reduced more reliably. Further, since the waveform output from the network interface card is faithfully reproduced, the power of the transmission signal can be surely reduced.

  (18) It is preferable that the transmission auxiliary device is the transmission auxiliary device (16) or (17), and the power of the predetermined format is a peak power of the multicarrier modulation signal. According to this configuration, the power measuring unit measures the peak power, which is the power at the position (peak) where the amplitude is largest, of the power that is the square of the amplitude of the multicarrier modulation signal. According to the present invention, since the peak power, which is the largest power of the instantaneous power, is measured, it is easy to detect the difference in power between the multi-carrier modulation signals, and it is possible to efficiently transmit a signal with low power. ..

  (19) The transmission auxiliary device is the transmission auxiliary device (16) or (17), 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 of the multicarrier modulation signal. It is preferable that the excess power is the sum of the above. According to this configuration, the power measuring unit measures the total sum of powers equal to or higher than the predetermined power value, so that the magnitude of the power can be effectively evaluated without being affected by the instantaneous fluctuation of the multicarrier modulation signal. it can. Further, 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.

  (20) The transmission auxiliary device is any of the transmission auxiliary devices (16) to (19), and the order changing unit uses a shift register. According to this configuration, the shift register, which has a simple configuration and is generally used for rearranging the order of the serial symbols, is used. Therefore, it is possible to effectively reduce the power and suppress the manufacturing cost. It will be possible.

  (21) The transmission auxiliary device is any one of the transmission auxiliary devices (16) to (20), wherein the input data is an I channel and a Q channel obtained by modulating a carrier wave having a phase difference of 90 degrees. It is preferable that the order changing means perform different rearrangement on the I channel and the Q channel. According to this configuration, the order changing unit does not perform one rearrangement on the input data, but performs different rearrangement on the I channel and the Q channel, which are two orthogonal components. 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.

  (22) The transmission auxiliary device is any of the transmission auxiliary devices (16) to (21), and the serial symbol is rearranged before or after the order of the serial symbols is rearranged by the order changing unit. It is preferable to apply a cyclic shift to.

  According to this configuration, after the serial symbols are cyclically shifted, the order of the serial symbols is rearranged by the order changing unit, or after the order of the serial symbols is rearranged by the order changing unit. Whether the serial symbol is cyclically shifted by. Usually, a shift register provided for performing a cyclic shift has a simple structure and is used for general purposes, and thus the price is low. Therefore, with the above configuration, it is possible to realize a function equivalent to a plurality of order changing means without providing a plurality of order changing means, so that it is possible to effectively reduce the power of the multi-carrier modulation signal and at the same time, reduce the cost. Can be kept low.

  (23) As described above, the receiving device according to the present invention is a receiving device configured to be able to receive the multicarrier modulated signal transmitted from the transmitting device according to any one of (1) to (13). And an inverse transforming means for transforming the multi-carrier modulated signal to generate parallel symbols, and an extracting means for extracting information on the rearrangement of the order performed by the order changing means from the parallel symbols generated by the inverse transforming means. , The same as the one converted by the parallelizing means by performing the reverse processing of the rearrangement performed by the order changing means on the parallel symbols based on the information of the rearrangement of the order extracted by the extracting means. It is preferable to include order recovery means for generating parallel symbols, and serialization means for reconverting the parallel symbols generated by the order recovery means into data before conversion by the parallelization means.

According to this configuration, when the multicarrier modulated signal from the transmitting device is received, the inverse transforming means transforms the multicarrier modulated signal to generate parallel symbols. The parallel symbols reproduce the parallel symbols after the order is rearranged by the order changing unit of the transmission device. Then, the extracting means extracts the information of the rearrangement of the order performed by the order changing means from the parallel symbol. This is, for example, a number such as {1}, so that the original parallel symbols {d ₁ , d ₂ , d ₃ } are rearranged such as {d ₁ , d ₃ , d ₂ }. I understand. Therefore, the order recovery means performs the rearrangement based on the information so as to restore the arrangement of the parallel symbols. Thereby, the same parallel symbol converted by the parallelization means is reproduced. Finally, the serializer converts the parallel symbols into serial symbols, thereby reproducing the input data to the transmitter.

  According to the present invention, a multi-carrier modulated signal generated from parallel symbols transmitted from a transmission device and rearranged to reduce power is received, and data input to the transmission device is reliably restored. can do.

  (24) As described above, the receiving device according to the present invention is a receiving device configured to be able to receive the multicarrier modulated signal transmitted from the transmitting device according to (14) or (15), Inverse conversion means for converting the multi-carrier modulated signal to generate parallel symbols, individual power measurement means for measuring the power of each symbol of the parallel symbols generated by the inverse conversion means, and the individual power measurement means Based on the power, the pilot insertion means identifies the symbol into which the information that can specify the rearrangement is identified, and the extraction means that extracts the information of the rearrangement of the order performed by the order changing means from the position of the symbol; Based on the information of the rearrangement of the order extracted by the extracting means, the same parallel symbol as the one converted by the parallelizing means is subjected to the reverse processing of the rearrangement performed by the order changing means on the parallel symbols. It is preferable that the apparatus further comprises an order recovery means for generating the serial number and a serialization means for re-converting the parallel symbol generated by the order recovery means into data before conversion by the parallelization means.

According to this configuration, when the multicarrier modulated signal from the transmitting device is received, the inverse transforming means transforms the multicarrier modulated signal to generate parallel symbols. The parallel symbols reproduce the parallel symbols after the order is rearranged by the order changing unit of the transmission device. Then, the individual power measuring means measures the power of each of the symbols forming the parallel symbol, and extracts the information on the rearrangement of the order performed by the order changing means from the position of the symbol having the smallest power, for example. This is, for example, 2 if the original parallel symbol {d ₁ , d ₂ , d ₃ } becomes {d ₁ , d ₃ , d ₂ } by the second rearrangement in the order changing means. That is, the power of the th symbol is the minimum. Therefore, the order recovery means performs the rearrangement based on the information so as to restore the arrangement of the parallel symbols. Thereby, the same parallel symbol converted by the parallelization means is reproduced. Finally, the serializer converts the parallel symbols into serial symbols, thereby reproducing the input data to the transmitter.

  According to the present invention, information other than data can be received by measuring the power of each received symbol. As a result, on the transmission device side, for example, what sort of rearrangement has been performed on parallel symbols can be transmitted as side information instead of being directly inserted in the data. Then, based on the side information, the data input to the transmission device can be reliably restored from the received multicarrier modulated signal.

  (25) As described above, the reception auxiliary device according to the present invention can receive the multicarrier modulated signal transmitted from the transmission device connected to the transmission auxiliary device according to any one of (16) to (22). And 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 signals are rearranged in the order of serial symbols and the order changing unit. Based on the separation means for separating into information and the rearrangement information of the order separated by the separation means, the serial symbol is subjected to processing reverse to the rearrangement performed by the order changing means to change the order. Order recovery means for generating serial symbols before conversion in the means.

According to this configuration, the separating unit separates the digital signal output from the receiving device including the network interface card, and extracts the serial symbol and the information on the rearrangement of the order performed by the order changing unit from the separated digital signal. This digital signal is the multi-carrier modulated signal transmitted from the transmitting device, which has been subjected to FFT conversion in the receiving device, for example, in the network interface card, and therefore reproduces the data string put together by the combining means. Also, here, the information that can specify the rearrangement is, for example, a number such as {2}, and in this case, the serial symbols {d ₁ , d ₃ , d ₂ } after rearrangement are the original numbers. It shows that the second rearrangement is performed on the serial symbols {d ₁ , d ₂ , d ₃ }. Therefore, the order recovery means can reproduce the input data based on this information.

  According to the present invention, a multi-carrier modulated 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 data is received. Can be reliably restored.

  (26) As described above, the transmission/reception system according to the present invention includes at least one transmission device according to any one of (1) to (13), and at least one reception device according to (23). Is preferably provided. With this configuration, it is possible to realize a transmission/reception system including a transmission device capable of reducing power during transmission and a reception device capable of accurately decoding the multicarrier modulated signal transmitted from the transmission device. be able to.

  (27) As described above, 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 preferably configured. According to this configuration, a transmission/reception system including a transmission device capable of reducing power at the time of transmission and a reception device capable of accurately decoding a multicarrier modulated signal transmitted from the transmission device is realized. be able to.

  (28) As described above, the transmission/reception system according to the present invention includes at least one transmission auxiliary device according to any one of (16) to (22), which is connected to a transmission device including at least a network interface card, It is preferable that at least one receiving auxiliary device according to (25) is connected to a receiving device including at least a network interface card. According to this configuration, even when the standard is defined by, for example, a wireless LAN, it is possible to reduce power during transmission without newly incorporating an order changing unit or the like in hardware such as a network interface card. A possible transmission/reception system can be realized.

  (29) As described above, the communication method according to the present invention is a communication method in a transmission/reception system including at least one receiving device for receiving a multicarrier modulated signal transmitted from at least one transmitting device. Then, the transmission device includes a parallelization step of converting input data into parallel symbols, an order changing step of rearranging the order of the parallel symbols, and a conversion of parallel symbols whose order is rearranged by at least the order changing step. Then, the conversion step of generating the multicarrier modulation signal and the power of the predetermined format of the multicarrier modulation signal generated by the conversion step are measured, and it is determined whether or not the power is larger than a preset threshold value. When the power is measured by the power measurement step and the power measurement step is larger than the threshold value, the order of the parallel symbols is rearranged again by the order changing step, and the parallel symbols are converted to multicarriers by the conversion step. A control step of generating a modulation signal and measuring the power of the predetermined format of the multicarrier modulation signal by the power measurement step, and the power measurement step before a series of processes by the control step reaches a predetermined number of times. According to the transmission step of transmitting the multi-carrier modulation signal when it is determined that the power is less than or equal to the threshold value, the receiving device receives the multi-carrier modulation signal from the transmitting device, An inverse transforming step of transforming the carrier modulation signal to generate parallel symbols, an extracting step of extracting information on the rearrangement of the order performed by the order changing step from the parallel symbols generated by the inverse transforming step, and the extracting Based on the information of the rearrangement of the order extracted by the step, the reverse processing of the rearrangement performed by the rearrangement step is performed on the parallel symbol, and the same parallel symbol converted by the parallelization step is generated. It is preferable to include an order recovery step of generating and a serialization step of reconverting the parallel symbol generated by the order recovery step into data before conversion in the parallelization step.

  (30) As described above, the communication method according to the present invention is a communication method in a transmission/reception system including at least one receiving device, which receives a multicarrier modulated signal transmitted from at least one transmitting device. There, the transmission device, a parallelization step of converting the input data into parallel symbols, an order changing step of rearranging the order of the parallel symbols, and information of the rearrangement of the order performed by the order changing step, A pilot insertion step of inserting into one symbol included in the parallel symbols after the order is rearranged by the rearrangement step, the symbol being in a position corresponding to the rearrangement information of the order; and the pilot insertion. By the step of converting the parallel symbols in which the information of the rearrangement of the order is inserted to generate a multicarrier modulated signal, and measuring the power of a predetermined format of the multicarrier modulated signal generated by the converting step. , A power measurement step of determining whether or not the power is greater than a preset threshold value, and, if the power is determined to be greater than the threshold value by the power measurement step, the order change step of the parallel symbols A control step of rearranging the order again, generating a multicarrier modulation signal from the parallel symbol by the conversion step, and measuring the power of the predetermined format of the multicarrier modulation signal by the power measurement step; and the control step. Before the series of processes by the predetermined number of times, the transmission step of transmitting the multi-carrier modulated signal when the power is determined to be equal to or less than the threshold by the power measurement step, the receiving device. Is an inverse conversion step of receiving the multi-carrier modulated signal from the transmission device, converting the multi-carrier modulated signal to generate parallel symbols, and measuring power of each symbol of the parallel symbols generated by the inverse conversion means. Based on the power measured by the individual power measurement step and the individual power measurement step to identify the symbol inserted information that can identify the rearrangement by the pilot insertion step, by the order changing step from the position of the symbol Based on the extraction step of extracting the information of the performed rearrangement of the order and the information of the rearrangement of the order extracted by the extraction step, the reverse of the rearrangement performed by the rearrangement step of the parallel symbols. A sequence recovery step for performing processing to generate the same parallel symbol as the one converted by the parallelization step; and a parallel synchronization step generated by the order recovery step. It is preferable to further include a serialization step of re-converting data into data before conversion in the parallelization step.

  Although the present invention has been described in detail, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that innumerable variants not illustrated can be envisaged without departing from the scope of the invention.

Claims (30)

Parallelization means for converting input data into parallel symbols,
An order changing means for rearranging the order of the parallel symbols,
At least a conversion means for converting a data sequence including parallel symbols whose order is rearranged by the order changing means, and generating a multicarrier modulation signal,
A power measuring unit that measures the power of a predetermined format of the multicarrier modulation signal generated by the converting unit and determines whether the power is greater than a preset threshold value,
When the power measuring unit determines that the power is higher than the threshold value, the order changing unit is controlled to rearrange the order of the parallel symbols, and the conversion unit is controlled to perform multi-coding from the parallel symbols. Control means for generating a carrier modulation signal and controlling the power measuring means to measure the power of the predetermined format of the multi-carrier modulation signal,
Before a series of processes by the control means reaches a predetermined number of times, a transmission means for transmitting the multicarrier modulated signal when the power is determined to be equal to or less than the threshold value by the power measurement means,
A transmission device comprising: Parallelization means for converting input data into parallel symbols,
An order changing means for rearranging the order of the parallel symbols,
At least a conversion means for converting a data sequence including parallel symbols whose order is rearranged by the order changing means, and generating a multicarrier modulation signal,
Power measuring means for measuring the power of a predetermined format of the multicarrier modulation signal generated by the converting means, and sequentially storing the multicarrier modulation signal having the minimum power,
Controlling the order changing means to rearrange the order of the parallel symbols again, controlling the converting means to generate a multicarrier modulation signal from the parallel symbols, controlling the power measuring means to control the multicarrier modulation. Control means for measuring the power of said predetermined type of signal,
Transmitting means for transmitting the multi-carrier modulated signal stored in the power measuring means when a series of processes by the control means reaches a predetermined number of times,
A transmission device comprising: Parallelization means for converting input data into parallel symbols,
An order changing means for rearranging the order of the parallel symbols,
At least a conversion means for converting a data sequence including parallel symbols whose order is rearranged by the order changing means, and generating a multicarrier modulation signal,
A plurality of sets, and each said order changing means performs a different order of rearrangement,
Power measuring means for measuring the power of a predetermined format of the multi-carrier modulated signal generated by the converting means, and selecting one set having the multi-carrier modulated signal having the minimum power.
Transmitting means for transmitting the set of multi-carrier modulated signals selected by the power measuring means,
A transmitter comprising: Parallelization means for converting input data into parallel symbols,
An order changing means for rearranging the order of the parallel symbols,
An inner product calculating means for calculating a numerical value corresponding to electric power of a predetermined format by taking an inner product of the parallel symbols whose order has been rearranged by the order changing means and a predetermined vector;
A power measuring means for determining whether or not the numerical value calculated by the inner product calculating means is larger than a preset threshold;
When it is determined by the power measuring unit that the calculated numerical value is larger than the threshold value, the order changing unit is controlled to rearrange the order of the parallel symbols, and the inner product calculating unit is controlled. The inner product of the parallel symbol and the predetermined vector is calculated to calculate a numerical value corresponding to the electric power of the predetermined format, and the power measuring means is controlled to determine whether the calculated numerical value is larger than the threshold value. Control means,
Before the series of processing by the control means reaches a predetermined number of times, if it is determined by the power measuring means that the calculated numerical value is equal to or less than the threshold value, at least the order is changed by the order changing means. And a conversion means for converting a data string including parallel symbols to generate a multicarrier modulation signal,
Transmitting means for transmitting the multi-carrier modulated signal generated by the converting means,
A transmitter comprising: Parallelization means for converting input data into parallel symbols,
An order changing means for rearranging the order of the parallel symbols,
An inner product calculating means for calculating a numerical value corresponding to electric power of a predetermined format by taking an inner product of the parallel symbols whose order has been rearranged by the order changing means and a predetermined vector;
Power measuring means for sequentially storing the parallel symbols having the smallest numerical value calculated by the inner product calculating means;
The numerical value corresponding to the electric power of the predetermined form is obtained by controlling the order changing means to rearrange the order of the parallel symbols again and controlling the inner product calculating means to take the inner product of the parallel symbols and the predetermined vector. And control means for controlling the power measuring means to store the parallel symbol having the smallest calculated numerical value,
When a series of processes by the control unit reaches a predetermined number of times, a conversion unit that converts at least the data string including the parallel symbols stored by the power measurement unit and generates a multicarrier modulation signal,
Transmitting means for transmitting the multi-carrier modulated signal generated by the converting means,
A transmitter comprising: Parallelization means for converting input data into parallel symbols,
An order changing means for rearranging the order of the parallel symbols,
A plurality of sets, and each said order changing means performs a different order of rearrangement,
At least one inner product calculating means for calculating a numerical value corresponding to electric power of a predetermined format by taking an inner product of the parallel symbols rearranged in order by the order changing means and a predetermined vector,
Power measuring means for determining the smallest numerical value among the numerical values calculated by the inner product calculating means,
At least a conversion unit for converting a data string including the parallel symbol having a numerical value determined to be the minimum by the power measurement unit and generating a multicarrier modulation signal,
Transmitting means for transmitting the multi-carrier modulated signal generated by the converting means,
A transmitter comprising:   7. The transmitter according to claim 1, wherein the power of the predetermined format is peak power.   7. The transmission device according to claim 1, wherein the power of the predetermined format is excess power that is a sum of powers equal to or more than a power value obtained by adding a predetermined value to the average power.   9. The transmission device according to claim 1, wherein the order changing unit uses a shift register.   10. The transmitter according to claim 1, wherein the conversion unit generates a multicarrier modulation signal by using inverse fast Fourier transform.   The parallel symbol is represented by an I channel and a Q channel obtained by modulating carriers having phases different from each other by 90 degrees, and the order changing means performs different rearrangement on the I channel and the Q channel. The transmitter according to any one of claims 1 to 10, characterized in that.   12. The transmitting apparatus according to claim 1, wherein the parallel symbols are cyclically shifted before or after the order of the parallel symbols is rearranged by the order changing unit.   The data string to be converted by the conversion unit includes parallel symbols whose order is rearranged by the order changing unit, and information on the rearrangement of the order performed by the order changing unit. 13. The transmitter according to any one of Items 1 to 12. The information of the rearrangement of the order performed by the rearrangement means is one symbol included in the parallel symbol after the rearrangement of the order by the rearrangement means, and the position corresponding to the rearrangement information of the order. Further comprising pilot insertion means for inserting into a symbol at,
13. The converting unit according to claim 1, wherein the converting unit converts the parallel symbols into which the information of the rearrangement of the order is inserted by the pilot inserting unit, and generates a multi-carrier modulated signal. Transmitter.   15. The transmission device according to claim 14, wherein the information that can be specified by the pilot insertion unit and that can specify the rearrangement is a zero value. A transmission auxiliary device that is connectable to a transmission device including at least a network interface card and is capable of sending a digital signal to the transmission device,
Order changing means for rearranging the order of the input data consisting of serial symbols,
A synthesizing unit for synthesizing the serial symbols whose order has been rearranged by the order changing unit and information on the rearrangement of the order performed by the order changing unit to generate one data string;
Reproducing means for receiving the data string synthesized by the synthesizing means, and for reproducing and outputting the multi-carrier modulated signal output when the data string is input to the transmitting device including the network interface card,
A power measuring unit that measures the power of a predetermined format of the multicarrier modulation signal output by the reproducing unit, and determines whether the power is greater than a preset threshold value,
When the power measuring unit determines that the power is larger than the threshold value, the order changing unit is controlled to rearrange the order of the serial symbols, and the conversion unit is controlled to perform multi-coding from the serial symbols. Control means for generating a carrier modulation signal and controlling the power measuring means to measure the power of the predetermined format of the multi-carrier modulation signal,
Before the series of processing by the control means reaches a predetermined number of times, the data sequence generated by the combining means when the power is determined to be equal to or less than the threshold value by the power measuring means is used as the digital signal. Transmitting means for transmitting to a transmitting device including a network interface card;
A transmission auxiliary device, comprising: A transmission auxiliary device that is connectable to a transmission device including at least a network interface card and is capable of sending a digital signal to the transmission device,
Order changing means for rearranging the order of the input data consisting of serial symbols,
A synthesizing unit for synthesizing the serial symbols whose order has been rearranged by the order changing unit and information on the rearrangement of the order performed by the order changing unit to generate one data string;
Reproducing means for receiving the data string synthesized by the synthesizing means, and for reproducing and outputting the multi-carrier modulated signal output when the data string is input to the transmitting device including the network interface card,
The power of the predetermined format of the multicarrier modulation signal output by the reproducing means is measured, and when the multicarrier modulation signal having the minimum power is detected, it is the source of the multicarrier modulation signal in the combining means. Power measuring means for storing the data string,
The sequence changing means is controlled to rearrange the order of the serial symbols, the reproducing 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. Control means for measuring the power of said predetermined type of signal,
Transmitting means for transmitting a data string stored in the synthesizing means to the transmitting device including the network interface card as the digital signal when a series of processes by the control means reaches a predetermined number of times;
A transmission auxiliary device, comprising:   18. The transmission auxiliary device according to claim 16, wherein the power of the predetermined format is a peak power of the multicarrier modulation signal.   The transmission according to claim 16 or 17, wherein the power of the predetermined format is an excess power that is a sum of powers equal to or more than a power value obtained by adding a predetermined value to the average power of the multicarrier modulation signal. Auxiliary device.   20. The transmission auxiliary device according to claim 16, wherein the order changing unit uses a shift register.   The input data is expressed by an I channel and a Q channel obtained by modulating a carrier wave having a phase difference of 90 degrees, and the order changing means performs different rearrangement on the I channel and the Q channel. The transmission auxiliary device according to any one of claims 16 to 20, wherein:   22. The transmission auxiliary apparatus according to claim 16, wherein the serial symbols are cyclically shifted before or after the order of the serial symbols is rearranged by the order changing unit. A receiving device configured to be able to receive a multi-carrier modulated signal transmitted from the transmitting device according to claim 1.
Inverse conversion means for converting the multi-carrier modulated signal to generate parallel symbols,
Extracting means for extracting information on the rearrangement of the order performed by the order changing means from the parallel symbols generated by the inverse conversion means,
On the basis of the information on the rearrangement of the order extracted by the extracting means, the parallel symbol is subjected to the reverse processing of the rearrangement performed by the rearrangement means, and the same parallelism as that converted by the parallelizing means. Order recovery means for generating symbols,
Serializing means for reconverting the parallel symbol generated by the order recovery means into data before conversion in the parallelizing means,
A receiver comprising: A receiving device configured to be capable of receiving a multi-carrier modulated signal transmitted from the transmitting device according to claim 14 or 15.
Inverse conversion means for converting the multi-carrier modulated signal to generate parallel symbols,
Individual power measurement means for measuring the power of each symbol of the parallel symbols generated by the inverse conversion means,
On the basis of the power measured by the individual power measuring means, the pilot inserting means identifies the symbol into which the information capable of identifying the rearrangement is identified, and the rearrangement of the order performed by the order changing means is performed from the position of the symbol. Extraction means for extracting information,
On the basis of the information on the rearrangement of the order extracted by the extracting means, the parallel symbol is subjected to the reverse processing of the rearrangement performed by the rearrangement means, and the same parallelism as that converted by the parallelizing means. Order recovery means for generating symbols,
Serializing means for reconverting the parallel symbol generated by the order recovery means into data before conversion in the parallelizing means,
A receiver comprising: 23. A digital signal output from a receiving device including at least a network interface card, which is configured to be able to receive a multi-carrier modulated signal transmitted from a transmitting device connected to the transmission auxiliary device according to claim 16. A reception auxiliary device configured to be possible,
Separation means for separating the digital signal into serial symbols and information on the rearrangement of the order performed by the order changing means,
Based on the information on the rearrangement of the order separated by the separating means, the serial symbol is subjected to a process opposite to the rearrangement performed by the rearrangement means, and the serial symbol before conversion in the rearrangement means is generated. Order recovery means to
A reception assistance device comprising: At least one transmitter according to any one of claims 1 to 13,
At least one receiving device according to claim 23,
A transmission/reception system configured to include. At least one transmitting device according to claim 14 or 15,
25. At least one receiving device according to claim 24,
A transmission/reception system configured to include. 23. At least one transmission auxiliary device according to any one of claims 16 to 22, which is connected to a transmission device including at least a network interface card.
26. At least one reception auxiliary device according to claim 25 connected to a reception device including at least a network interface card,
A transmission/reception system configured to include. A communication method in a transmission/reception system configured to include at least one receiving device, which receives a multi-carrier modulated signal transmitted from at least one transmitting device,
The transmitter is
A parallelization process for converting the input data into parallel symbols,
An order changing step of rearranging the order of the parallel symbols,
At least a conversion step of converting the parallel symbols whose order is rearranged by the order changing step, and generating a multi-carrier modulated signal,
Measuring the power of a predetermined format of the multi-carrier modulation signal generated by the conversion step, a power measurement step of determining whether the power is greater than a preset threshold,
When the power is determined to be larger than the threshold value by the power measurement step, the order of the parallel symbols is rearranged again by the order changing step, and a multicarrier modulation signal is generated from the parallel symbol by the conversion step. A control step of measuring the power of the predetermined format of the multicarrier modulated signal by the power measuring step,
Before the series of processes by the control step reaches a predetermined number of times, a transmission step of transmitting the multicarrier modulated signal when the power is determined to be equal to or less than the threshold value by the power measurement step,
The receiving device is
An inverse conversion step of receiving the multicarrier modulation signal from the transmission device, converting the multicarrier modulation signal to generate parallel symbols,
An extraction step of extracting information on the rearrangement of the order performed by the order changing step from the parallel symbols generated by the inverse conversion step;
Based on the information on the rearrangement of the order extracted by the extracting step, the parallel symbol is subjected to the reverse processing of the rearrangement performed by the rearrangement step, and the same parallel as the one converted by the parallelizing step. An order recovery step for generating symbols,
A serialization step of re-converting the parallel symbols generated by the order recovery step into data before conversion in the parallelization step;
A communication method in a transmission/reception system, comprising: A communication method in a transmission/reception system configured to include at least one receiving device, which receives a multi-carrier modulated signal transmitted from at least one transmitting device,
The transmitter is
A parallelization process for converting the input data into parallel symbols,
An order changing step of rearranging the order of the parallel symbols,
The information on the rearrangement of the order performed by the order changing step is one symbol included in the parallel symbol after the order is rearranged by the order changing step, and corresponds to the information on the rearrangement of the order. Pilot insertion step to insert in the symbol at the position,
A conversion step of converting the parallel symbols in which the information of the rearrangement of the order is inserted by the pilot insertion step, and generating a multicarrier modulation signal,
Measuring the power of a predetermined format of the multi-carrier modulation signal generated by the conversion step, a power measurement step of determining whether the power is greater than a preset threshold,
When the power is determined to be larger than the threshold value by the power measurement step, the order of the parallel symbols is rearranged again by the order changing step, and a multicarrier modulation signal is generated from the parallel symbol by the conversion step. A control step of measuring the power of the predetermined format of the multicarrier modulated signal by the power measuring step,
Before the series of processes by the control step reaches a predetermined number of times, a transmission step of transmitting the multicarrier modulated signal when the power is determined to be equal to or less than the threshold value by the power measurement step,
The receiving device is
An inverse conversion step of receiving the multicarrier modulation signal from the transmission device, converting the multicarrier modulation signal to generate parallel symbols,
An individual power measurement step of measuring power of each symbol of the parallel symbols generated by the inverse conversion means,
On the basis of the power measured by the individual power measuring step, the symbol in which the information for specifying the rearrangement is inserted is identified by the pilot inserting step, and the order is rearranged from the position of the symbol by the rearrangement step. An extraction step of extracting information of
Based on the information on the rearrangement of the order extracted by the extracting step, the parallel symbol is subjected to the reverse processing of the rearrangement performed by the rearrangement step, and the same parallel as the one converted by the parallelizing step. An order recovery step for generating symbols,
A serialization step of re-converting the parallel symbols generated by the order recovery step into data before conversion in the parallelization step;
A communication method in a transmission/reception system, comprising: