JP2002094479A - Multi-carrier communication device and peak power suppression method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the peak voltage of a signal using a simple device configuration, without deteriorating the transmission characteristics or causing increase in a device size. SOLUTION: After digital modulation at a digital modulation section 101, each OFDM symbol (first OFDM symbol group), that is subjected to parallel conversion by an S/P conversion section 102, is outputted to a mapping section 103; an OFDM symbol space is expanded with an OFDM symbol, that is superposed to a predetermined number of sub carriers as '0' out of a plurality of sub carriers where the first OFDM symbol group is superposed; the same number of OFDM symbols as the number of the first OFDM symbol groups is selected in the order of small peak power from the symbol pattern of the space; the first OFDM symbol group is associated with the selected OFDM symbol; the associated, selected OFDM symbol is outputted, and the selected OFDM symbol is subjected to inverse fast-Fourier transformation at an IFFT section 104, prior to transmission.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to OFDM (Orthogo
The present invention relates to a multi-carrier communication device to which a (nal frequency division multiple) system is applied and a peak power suppression method in the multi-carrier communication device, and particularly to a mobile station device such as a mobile phone and a mobile videophone in a mobile communication system, The present invention relates to a multi-carrier communication apparatus suitable for use in a base station apparatus for communication, a transmission / reception apparatus for digital TV broadcasting and digital audio broadcasting, and a peak power suppressing method in the multi-carrier communication apparatus.

[0002]

2. Description of the Related Art Conventionally, as a multi-carrier communication apparatus of this type and a method of suppressing peak power in the multi-carrier communication apparatus, there is a method described in Japanese Patent Application Laid-Open No. 7-143098.

FIG. 30 is a block diagram showing a configuration of a conventional multi-carrier communication device.

[0004] A multicarrier communication apparatus 11 shown in FIG. 30 has a digital modulation unit 12 and an S / P (Ser
ial / Parallel) 13 and an IFFT (Inverse Fast Fourier Transform) unit 14, and an FFT (Fast Fourier Transform) unit 15, a P / S (Parallel / Serial) converter 16, The demodulation unit 17 is provided.

[0005] In such a configuration, on the transmitting side, the digital modulator 12 uses the BPSK (Binaripha
se Phase Shift Keying), 16QAM (Quadrature Am
Digital modulation based on transmission data is performed according to a modulation method such as Plitude Modulation.

The serial data after the modulation is S / P
In the conversion unit 13, parallel data (digital symbols)
And the parallel data is converted to the IFFT unit 14
Then, by performing the inverse fast Fourier transform process, the signals are superimposed on subcarriers having different phases, and are output as time-sequentially continuous transmission OFDM symbol signals.

On the other hand, on the receiving side, the received OFDM symbol signal is subjected to fast Fourier transform processing by the FFT unit 15 to separate each data superimposed on subcarriers having different phases, and after this separation, The parallel data is converted to serial data by a P / S converter 16 and the serial data is converted to a digital demodulator 17.
, And are digitally demodulated and output.

[0008]

However, in the conventional device, the transmission data is converted into parallel data and then transmitted by being superimposed on a plurality of subcarriers.
Since there is no correlation for each subcarrier, if the phases of the subcarriers overlap, an OFDM symbol has an extremely large signal amplitude.

As described above, when the peak voltage of a signal increases during transmission due to the overlapping of the subcarriers, when the signal is amplified by an amplifier, the peak portion of the signal is cut off according to the upper limit gain of the amplifier.

In order to prevent this, if a large amplifier is used, there is a problem that the size of the entire device is increased, which results in an increase in the size of the device, which leads to an increase in power consumption and an increase in heat generation.

Here, as a method of suppressing the peak voltage, there is a method of setting an upper limit value of a voltage and simply cutting a voltage exceeding the upper limit value as described in Japanese Patent Application Laid-Open No. 7-143098. . However, simply cutting off the peak voltage distorts the signal and widens the band, which causes a problem that the error rate at the time of reception deteriorates (transmission characteristics deteriorate).

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has been made in view of the above-mentioned circumstances. An object of the present invention is to provide a peak power suppression method in a carrier communication device and a multicarrier communication device.

[0013]

According to the present invention, there is provided a multicarrier communication apparatus comprising: a multicarrier communication apparatus in which a first symbol sequence including a first symbol having at least one of an in-phase component and a quadrature component having an amplitude of 0 is mapped to a subcarrier A configuration including a receiving unit for receiving a signal and a demapping unit for demapping the multicarrier signal to received data is adopted.

[0014] In the multicarrier communication apparatus according to the present invention, the demapping means converts the multicarrier signal mapped to the subcarrier with the first symbol sequence including the first symbol into a second symbol sequence not including the first symbol. Demapping is performed in a predetermined symbol unit, and the demapped symbol pattern is demodulated to obtain received data.

[0015] In the multicarrier communication apparatus of the present invention, the demapping means demodulates the multicarrier signal mapped to the subcarrier by the first symbol sequence including the first symbol, and is represented by three demodulated discrete values. The first data is converted into the second data represented by two discrete values.

According to these configurations, some of the subcarriers have an amplitude of 0 and the symbol data pattern increases, that is, the symbol data space increases, so that a symbol pattern having a large peak power is not used. As a result, the signal peak voltage can be suppressed with a simple device configuration without deteriorating the transmission characteristics and without increasing the size of the device.

In the multicarrier communication apparatus according to the present invention, the demapping means includes a storage means for storing a table in which the first symbol sequence and the second symbol sequence are associated, and a collation for collating the received symbol sequence with the table. Means is provided.

According to this configuration, the first and second symbol patterns can be easily collated, and demapping can be performed efficiently. As a result, the symbol data of the transmitted multicarrier signal can be properly demodulated.

In the multicarrier communication apparatus according to the present invention, the demapping means associates the second data pattern represented by two discrete values with the first data pattern represented by three discrete values. A configuration including storage means for storing a table is employed.

The multicarrier communication apparatus according to the present invention employs a configuration including retransmission request means for requesting the transmission side to retransmit when a received symbol sequence cannot be associated in the table.

According to this configuration, even if the received symbol data is erroneous during transmission or the like, error-correcting symbol data can be received by performing error correction.

The multi-carrier communication apparatus according to the present invention employs a configuration including an error correcting means for correcting an error in the symbol sequence when the received symbol sequence cannot be correlated in the table.

According to this configuration, even if received symbol data is erroneous during transmission or the like, error-free symbol data can be received by retransmission.

[0024] In the multicarrier communication apparatus of the present invention, the demapping means determines the first symbol sequence based on the measured amplitude, and an amplitude measuring means for measuring the amplitude of the symbol mapped to each subcarrier. And a pattern determining means.

According to this configuration, it is possible to accurately determine a symbol pattern including a symbol having an amplitude of zero.

[0026] In the multicarrier communication apparatus of the present invention, the demapping means determines, in symbol determination of the received symbol sequence, a subcarrier on which the first symbol is mapped according to the number of subcarriers on which the first symbol whose amplitude is 0 is mapped. And a second determination unit that determines a symbol by polarity determination for a symbol other than the symbol determined as the first symbol in the symbol sequence.

According to this configuration, the symbol pattern including the symbol having the amplitude of 0 can be accurately determined in the first determination, and the other symbols need only be determined by the polarity, so that the symbol pattern can be more accurately determined. Can be determined.

[0028] The multicarrier communication apparatus of the present invention employs a configuration in which the demapping means demaps a plurality of first symbol strings in a predetermined symbol unit in association with one data pattern.

In the multicarrier communication apparatus according to the present invention, the demapping means combines the plurality of symbols as a combined symbol, and determines a symbol having the smallest amplitude value among the combined symbols as the first symbol. And a second determination unit that performs polarity determination on symbols other than the first symbol.

The multicarrier communication apparatus of the present invention employs a configuration in which the combining means selects and combines a plurality of symbols.

The multicarrier communication apparatus of the present invention employs a configuration in which the combining means combines a plurality of symbols with equal gain.

The multicarrier communication apparatus according to the present invention employs a configuration in which the combining means combines a plurality of symbols at a maximum ratio.

According to these configurations, the amplitude of some of the subcarriers becomes zero and the pattern of symbol data increases, that is, the symbol data space increases, so that a symbol pattern with a large peak power is not used. As a result, the signal peak voltage can be suppressed with a simple device configuration without deteriorating the transmission characteristics and without increasing the size of the device.

[0034] The multicarrier communication apparatus of the present invention comprises: a channel estimating means for estimating a channel using a known signal;
Using a result of the channel estimation, a first symbol sequence mapped to a subcarrier in a first symbol sequence including a first symbol
A replica signal generating means for generating a symbol string replica signal, a received symbol pattern determining means for determining the received symbol pattern by comparing the replica signal with a received symbol pattern, and a receiving symbol pattern determined from the determined received symbol pattern. And a demodulating means for obtaining received data.

According to this configuration, it is possible to judge the symbol patterns collectively, and it is possible to determine a more accurate symbol pattern.

[0036] The multicarrier communication apparatus according to the present invention comprises: a mapping means for mapping data to be transmitted to subcarriers in a first symbol sequence including a first symbol; a transmission means for transmitting a mapped multicarrier signal;
Is adopted.

[0037] The multicarrier communication apparatus of the present invention employs a configuration in which the mapping means maps the second symbol sequence obtained by modulating the data to be transmitted to the subcarrier using the first symbol sequence including the first symbol.

[0038] In the multicarrier communication apparatus according to the present invention, the mapping means converts the second data represented by the two discrete values to be transmitted into the first data represented by the three discrete values,
A configuration is employed in which the first data is modulated into a first symbol sequence including a first symbol.

According to these configurations, transmission is performed in the first symbol sequence including the first symbol in which the amplitude of at least one of the in-phase component and the quadrature component is 0, so that multi-carrier communication can be performed with the peak power suppressed. It can be carried out.

[0040] The multicarrier communication apparatus of the present invention employs a configuration in which the mapping means includes storage means for storing a table in which the first symbol string and the second symbol string are associated with each other.

According to this configuration, the first and second symbol patterns can be easily collated, and mapping can be performed efficiently.

[0042] In the multicarrier communication apparatus of the present invention, the mapping means includes a table associating a second data pattern represented by two discrete values with a first data pattern represented by three discrete values. Is provided with a storage means for storing.

According to this configuration, the first and second data patterns can be easily collated, and mapping can be performed efficiently.

The multicarrier communication apparatus of the present invention employs a configuration in which the mapping means fixes the number of subcarriers on which the first symbol is mapped.

The multi-carrier communication apparatus according to the present invention has a first
A configuration including a notification unit for notifying the number of subcarriers to which symbols are mapped is employed.

According to these configurations, some of the subcarriers have an amplitude of 0 and the symbol data pattern increases, that is, the symbol data space increases, so that a symbol pattern having a large peak power is not used. As a result, the signal peak voltage can be suppressed with a simple device configuration without deteriorating the transmission characteristics and without increasing the size of the device.

According to the multicarrier communication apparatus of the present invention, in the first symbol sequence mapped by the mapping means,
The configuration is such that the Euclidean distance between the first symbol row and another first symbol row is equal to or longer than a predetermined distance.

According to the multicarrier communication apparatus of the present invention, in the first symbol sequence mapped by the mapping means,
The first symbol sequence and another first symbol sequence adopt a configuration in which the position of the subcarrier to which the first symbol is mapped is different.

According to this configuration, the multicarrier communication apparatus of the present invention associates symbol patterns having a Euclidean distance equal to or greater than a predetermined distance with different conventional data patterns, so that symbol patterns are affected by a path such as fading. Can be distinguished from other symbols.

In the multicarrier communication apparatus according to the present invention, the mapping means associates one data pattern with a plurality of first symbol strings, and the transmitting means transmits any one of the plurality of first symbol strings. take.

According to this configuration, the multicarrier communication apparatus of the present invention can receive a transmitted symbol as one of a plurality of symbols corresponding to transmitted data when an error occurs due to fading or the like. The correct symbol can be received.

According to the multicarrier communication apparatus of the present invention, in the first symbol sequence mapped by the mapping means,
A configuration is employed in which the Euclidean distance between a first symbol string corresponding to one piece of data to be transmitted and another first symbol string corresponding to the data to be transmitted is equal to or less than the Euclidean distance to another first symbol string.

According to this configuration, the multicarrier communication apparatus of the present invention associates symbol patterns having shorter Euclidean distances with one conventional data pattern, so that the symbols change under the influence of a path such as fading. Can also be distinguished from other symbols.

[0054] The multicarrier communication apparatus of the present invention employs a configuration in which the mapping means arranges the first symbol on a subcarrier different from the subcarrier on which the first symbol has been arranged in the past in the transmitted first symbol sequence.

The multicarrier communication apparatus of the present invention employs a configuration in which the mapping means includes an insertion position storage means for storing the position and timing of the first symbol in the first symbol sequence.

The multicarrier communication apparatus according to the present invention employs a configuration in which the mapping means includes random number generating means for determining the position and timing of the first symbol in the first symbol sequence by using random numbers.

According to these configurations, the multicarrier communication apparatus of the present invention transmits the same symbol continuously by alternately associating symbols with different positions of subcarriers of amplitude "0". And interference between symbols can be reduced.

[0058] The multicarrier communication apparatus of the present invention employs a configuration in which the mapping means uses a plurality of first symbols as one set for one first symbol and maps the data pattern to the first symbol sequence.

According to this configuration, the multicarrier communication apparatus of the present invention combines a plurality of subcarriers of amplitude “0” and uses them as one pattern, so that a signal is affected by a path such as fading. Even in the case of a change, communication with few errors can be performed by judging from positions of a plurality of subcarriers whose amplitudes are “0”.

The multicarrier communication apparatus according to the present invention employs a configuration including a first spreading means for spreading a symbol sequence at a predetermined spreading factor.

The multi-carrier communication apparatus of the present invention
The spreading means employs a configuration in which the first symbol sequence including the first symbol mapped by the mapping means is spread at a predetermined spreading factor.

The multi-carrier communication apparatus of the present invention
The present invention employs a configuration including serial-parallel conversion means for performing serial-parallel conversion on a first symbol sequence including the first symbols spread by the spreading means at a predetermined spreading factor.

According to these configurations, a symbol pattern having a large peak power is not used by performing spreading processing on a symbol converted to a symbol pattern including amplitude 0, and a symbol pattern having a large peak power is not used. They can be transmitted in the same band. As a result, the signal peak voltage can be suppressed and the frequency utilization efficiency can be increased without deteriorating the transmission characteristics and increasing the size of the device.

The multi-carrier communication apparatus of the present invention
The spreading unit multiplies the second symbol sequence obtained by modulating the data to be transmitted by a spreading code, and the mapping unit maps the second symbol sequence to subcarriers using the first symbol sequence including the first symbol. .

According to this configuration, a signal obtained by code-multiplexing the symbol pattern after the spreading process is converted into a symbol pattern including amplitude 0 and transmitted, so that a symbol pattern having a large peak power is not used. As a result, it is possible to suppress the peak voltage of the signal and increase the frequency use efficiency with a simple device configuration without deteriorating the transmission characteristics and increasing the size of the device.

The multi-carrier communication apparatus of the present invention includes serial-parallel conversion means for performing serial-parallel conversion on a symbol sequence, and the first spreading means converts the serial-parallel-converted first symbol sequence at a predetermined spreading factor. Adopt a spreading configuration.

The multicarrier communication apparatus of the present invention employs a configuration in which the serial / parallel conversion means performs serial / parallel conversion on a first symbol sequence including the first symbol mapped by the mapping means.

The multicarrier communication apparatus according to the present invention employs a configuration in which the mapping means maps the symbol sequence spread by the first spreading means.

[0069] The multicarrier communication apparatus of the present invention includes second spreading means for spreading the first symbol sequence including the first symbol mapped by the mapping means at a predetermined spreading factor. A configuration is employed in which serial-parallel conversion is performed on the first symbol sequence multiplied by the spreading code by the two spreading means.

The multicarrier communication apparatus of the present invention
A second spreading means for spreading the symbol sequence at a predetermined spreading factor, wherein the serial / parallel conversion means performs serial / parallel conversion on the second symbol sequence multiplied by the spreading code by the second spreading means, A configuration is adopted in which mapping processing is performed on the signal spread by the first spreading means.

According to these configurations, a symbol pattern having a large peak power is not used by performing spreading processing on a symbol converted to a symbol pattern including amplitude 0 and transmitting the symbol. Further, by multiplying the spread signal by using a different code for each communication device, it is possible to perform transmission using the same band by a plurality of transmitters. As a result, the signal peak voltage can be suppressed and the frequency utilization efficiency can be increased without deteriorating the transmission characteristics and increasing the size of the device.

The multi-carrier communication apparatus of the present invention employs a configuration including two-dimensional interleaving means for rearranging the spread transmission signal in the order of subcarriers and the order of transmission time on a chip-by-chip basis.

According to this configuration, by performing interleaving on a chip basis in two dimensions on the time axis and the carrier frequency axis, symbols can be dispersed on the time axis and the frequency axis in chip units, so that burst error Communication that is resistant to frequency selective fading can be performed.

The multi-carrier communication apparatus of the present invention
A configuration is provided that includes a third spreading unit that spreads the signal spread by the spreading unit at a predetermined spreading factor using a different spreading code for each communication device.

According to this configuration, a symbol pattern having a large peak power is not used by performing spreading processing on a symbol converted to a symbol pattern including amplitude 0 and transmitting the symbol. Further, by multiplying the spread signal by using a different code for each communication device, it is possible to perform transmission using the same band by a plurality of transmitters. as a result,
The signal peak voltage can be suppressed and the frequency utilization efficiency can be increased without deteriorating the transmission characteristics and without increasing the size of the device.

The multicarrier communication apparatus of the present invention
A configuration including interleaving means for rearranging the transmission signal spread by the spreading means in units of chips is adopted.

The multi-carrier communication apparatus of the present invention
A configuration including interleaving means for rearranging the transmission signal spread by the spreading means in units of chips is adopted.

The multi-carrier communication apparatus according to the present invention has a configuration including third spreading means for spreading a signal rearranged in units of chips by the interleaving means at a predetermined spreading factor using a spreading code different for each communication apparatus. take.

According to these configurations, symbols after spreading are subjected to interleaving on a chip basis and transmitted, and received symbols are deinterleaved on a chip basis, so that in the case of time interleaving, symbols are interpreted on a chip basis. Since it can be distributed on the time axis, and in the case of frequency interleaving, it can be distributed on the frequency axis, it is possible to perform communication that is resistant to burst errors.

A multi-carrier communication apparatus according to the present invention employs a configuration for communicating with any of the communication apparatuses described above.

According to this configuration, a symbol pattern having a large peak power is not used by performing spreading processing on a symbol converted into a symbol pattern including amplitude 0 and transmitting the symbol. Further, by multiplying the spread signal by using a different code for each communication device, it is possible to perform transmission using the same band by a plurality of transmitters. as a result,
The signal peak voltage can be suppressed and the frequency utilization efficiency can be increased without deteriorating the transmission characteristics and without increasing the size of the device.

[0082] A communication terminal apparatus according to the present invention includes the above-mentioned multicarrier communication apparatus. Further, a base station apparatus according to the present invention includes the multicarrier communication apparatus. According to these configurations, multi-carrier communication can be performed with the peak power suppressed.

According to these configurations, the amplitude of some of the subcarriers becomes zero and the pattern of symbol data increases, that is, the symbol data space increases, so that a symbol pattern with a large peak power is not used. As a result, the signal peak voltage can be suppressed with a simple device configuration without deteriorating the transmission characteristics and without increasing the size of the device.

According to the peak power suppression method of the present invention, the transmitting device maps the data to be transmitted to subcarriers in the first symbol sequence including the first symbol, and transmits the mapped multicarrier signal. A receiving step of receiving a multicarrier signal mapped to a subcarrier in a first symbol sequence including the first symbol on the receiving device side, and converting the multicarrier signal into received data. And a demapping step of mapping.

The peak power suppressing method according to the present invention is characterized in that, in the mapping step, the second symbol sequence obtained by modulating the data to be transmitted is mapped to the subcarrier using the first symbol sequence including the first symbol.

In the peak power suppressing method according to the present invention, the mapping step converts the second data represented by the two discrete values to be transmitted into the first data represented by the three discrete values and transmits the first data. Is modulated into a first symbol sequence including the first symbol.

In the peak power suppressing method of the present invention, in the demapping step, the multicarrier signal mapped to the subcarrier in the first symbol sequence including the first symbol is converted into the second symbol sequence not including the first symbol. It is characterized in that demapping is performed in a predetermined symbol unit, and the demapped symbol pattern is demodulated to obtain received data.

In the peak power suppressing method according to the present invention, in the demapping step, the multicarrier signal mapped to the subcarrier by the first symbol sequence including the first symbol is demodulated and represented by three demodulated discrete values. First data to 2
It is characterized in that it is converted into second data represented by two discrete values.

According to these methods, some of the subcarriers have an amplitude of 0 and the pattern of symbol data increases, that is, the symbol data space becomes large. If a necessary number is selected and used for transmission, a symbol pattern having a large peak power is not used, and consequently, a signal can be transmitted with a simple device configuration without deteriorating transmission characteristics and increasing the size of the device. Can be suppressed.

In the peak power suppressing method according to the present invention, in the demapping step, an amplitude measuring step of measuring the amplitude of a symbol mapped to each subcarrier, and the first symbol sequence is determined based on the measured amplitude. 38. The peak power suppressing method according to claim 33, further comprising a pattern determining step.

According to this method, it is possible to accurately determine a symbol pattern including a symbol having an amplitude of 0.

The peak power suppressing method of the present invention includes a notifying step of notifying the number of subcarriers on which the first symbol whose amplitude is 0 is mapped on the transmitting device side, and the receiving device side includes: A first determination step of determining a subcarrier on which the first symbol is mapped according to the number of subcarriers on which the first symbol is mapped with an amplitude of 0, and a second determination step of performing polarity determination on a symbol other than the first symbol 38. The peak power suppression method according to claim 33, further comprising:

According to this method, it is possible to accurately determine a symbol pattern including a symbol having an amplitude of 0 in the first determination, and to determine other symbols only by polarity determination. Can be determined.

The peak power suppressing method according to the present invention includes a transmitting step of transmitting a known signal on a transmitting device side, a receiving step of receiving the known signal on a receiving device side, and a channel using the received signal. A channel estimating step of performing estimation, a replica signal generating step of generating a replica signal of a first symbol sequence including a first symbol using a result of the channel estimation, and comparing the replica signal with a received symbol pattern. , A received symbol pattern determining step of determining a received symbol pattern, and a demodulating step of obtaining received data from the determined received symbol pattern.

According to this method, the symbol patterns can be determined collectively, and the symbol patterns can be determined more accurately.

[0096]

BEST MODE FOR CARRYING OUT THE INVENTION The inventor of the present invention performs a sequential encoding process on a signal to be transmitted in multi-carrier communication, thereby generating a signal including an amplitude "0" and creating a sub-carrier not to be transmitted. Focusing on the reduction in the overall peak amplitude, by sequentially encoding the transmitted signal and distributing and transmitting the signal in the frequency domain, it is possible to suppress the peak voltage of the transmitted signal in multicarrier communication. I found it.

That is, the gist of the present invention is to convert a signal represented by a binary value into a signal represented by a ternary value to generate a signal having an amplitude of “0” in the subcarrier direction.
It is to suppress the peak voltage of the transmission signal by reducing the possibility that the phase of the signal of each subcarrier overlaps and the number of overlaps.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a multicarrier communication apparatus according to Embodiment 1 of the present invention.

The multicarrier communication apparatus according to Embodiment 1 of the present invention includes a digital modulation section 101, an S / P conversion section 102, a mapping section 103, and an IFFT section 104
, Wireless transmitting section 105, antenna 106, wireless receiving section 107, FFT section 108, demapping section 109
, A P / S converter 110, and a digital demodulator 111.

The mapping section 103 includes a pattern conversion section 151 and a table storage section 152.

The demapping unit 109 includes a pattern conversion unit 161 and a table storage unit 162.

In FIG. 1, digital modulation section 101
The transmission data is digitally modulated, and the modulated serial data is output to a serial / parallel (S / P) converter 102. The S / P converter 102 performs serial-to-parallel conversion on the serial data, assigns each data to a subcarrier, and outputs the data to the pattern converter 151 of the mapping unit 103 as a symbol pattern before conversion.

Pattern conversion section 151 converts the symbol pattern before conversion into a symbol pattern after conversion, and outputs this symbol pattern signal to IFFT section 104. The table storage unit 152 stores correspondence information between the pre-conversion symbol pattern and the post-conversion symbol pattern, and outputs the correspondence information according to the reference of the pattern conversion unit 151.

IFFT section 104 performs inverse fast Fourier transform on the converted symbol pattern, and outputs the transmission signal after inverse Fourier transform to radio transmitting section 105. Wireless transmission unit 1
In step 05, the transmission signal is converted from digital to analog, up-converted, and transmitted as a wireless signal via the antenna 106.

[0106] The radio signal received via antenna 106 is down-converted into an analog-to-digital signal by radio reception section 107 and output to FFT section 108. FFT section 108 performs a fast Fourier transform on the received signal to obtain received symbol pattern data, and outputs the received symbol pattern to pattern conversion section 161 of demapping section 109.

The pattern conversion section 161 converts the received symbol pattern data into a pre-conversion symbol pattern.
Output to S conversion section 110. The table storage unit 162 stores
The correspondence information between the received symbol pattern and the symbol pattern before conversion is stored, and the correspondence information is output according to the reference of the pattern conversion unit 161.

The P / S conversion section 110 performs parallel-to-serial conversion on the symbol pattern before conversion, combines the signals of the respective subcarriers into serial data, and forms a digital demodulation section 111.
Output to Digital demodulation section 111 demodulates serial data and outputs received data.

The transmission operation of the multicarrier communication apparatus having the above configuration will be described. The transmission data is subjected to BPSK modulation in digital modulation section 101, and S / P
The conversion section 102 performs serial-parallel conversion. This data is superimposed on a plurality of subcarriers and used as a pre-conversion symbol pattern by
1 is output.

The pre-conversion symbol pattern is converted by the pattern conversion section 151 from the symbol patterns having two kinds of values, “+1”, “−1”, “+1”, “−1”, “0”.
, And is output to the IFFT unit 104 as a converted symbol pattern. A detailed description of the conversion operation will be described later.

The converted symbol pattern is stored in the IFFT unit 1
In 04, the inverse fast Fourier transform is performed, and the signal after the inverse Fourier transform is output to the wireless transmission unit 105. The signal after the inverse Fourier transform is subjected to digital-to-analog conversion in the wireless transmission unit 105, and then up-converted and transmitted as a wireless signal through the antenna 106.

After the received signal is subjected to fast Fourier transform by FFT section 108, it is output to pattern conversion section 161 of demapping section 109. In the pattern conversion unit 161, the converted symbol patterns are “+1”, “−”.
A symbol pattern having three values of “1” and “0” is converted into a symbol pattern of two values of “+1” and “−1” and output to the P / S converter 110 as a symbol pattern before conversion. Is done. A detailed description of the conversion operation will be described later.

The demapped symbol data is P
After being converted into serial data by the / S converter 110, it is output to the digital demodulator 111. Digital demodulation unit 11
In step 1, received data is obtained by performing digital demodulation processing on serial data.

Next, OFD in pattern conversion section 151
The conversion operation of M symbols will be described.

Since each subcarrier on which each OFDM symbol is superimposed in IFFT section 104 has a positive (+) or negative (-) value, one OFDM symbol pattern of an OFDM signal composed of N subcarriers Is composed of 2 ^N combinations. Here, the positive (+) and negative (-) values are respectively "+1",
Expressed as "-1".

In the present invention, of the N subcarriers, r
And modulate them, and transmit the remaining (N−r) amplitudes of 0 (transmit nothing). The number of patterns for selecting r carriers from the N subcarriers is obtained by _N C _r .

R gives a positive or negative value. in this case,
It can be seen that 1 OFDM symbol can be expressed in _N C _r · 2 ^r ways. In the conventional multicarrier communication, each subcarrier has only a positive or negative value, whereas in the multicarrier communication of the present invention, since each subcarrier can take 0, the signal space is large, that is, , _N C _r
• 2 ^r > 2 ^N may be possible.

[0118] Therefore, _N C _r · 2 to choose ^the 2 ^N from having a small peak power from the symbol of ^r Street, conventional OF
By mapping DM symbols to OFDM symbols of the present invention, peak power can be suppressed.

Next, an example of OFDM symbol conversion will be described with reference to FIGS.

In this case, an O consisting of four subcarriers
An example of converting a symbol pattern having a state of amplitude “0” for one subcarrier in an FDM symbol will be described.

FIG. 2 is a diagram showing an OFDM symbol pattern including four subcarriers in BPSK modulation. FIG. 3 is a diagram illustrating an OFDM symbol pattern in which one of the four subcarriers in BPSK modulation has an amplitude of “0”.

Conventional OFD consisting of 4 subcarriers
The M symbol pattern is composed of 16 combinations as shown in FIG. Further, a new OFDM symbol pattern in which one subcarrier has a state of amplitude “0” is composed of 32 combinations as shown in FIG. By including the state of amplitude “0”, the conventional O
A new OFDM symbol pattern with a lower peak power than the FDM symbol pattern and a new OFDM symbol pattern with a higher peak power than the conventional OFDM symbol pattern are created.

FIG. 4 is a diagram showing an example of a correspondence table between a symbol pattern before conversion and a symbol pattern after conversion in pattern conversion section 151. In this example, for the sake of simplicity, PN1 is used for both symbol patterns in order.
, PN2 is associated with P3,..., PN16 is associated with P31. In FIG. 4, f1 to f4 indicate the frequency of each subcarrier.

In the correspondence table shown in FIG.
DM symbol pattern PN1 (+1, +1, +1, +
1) is an OFDM symbol pattern P1 (+ 1, + 1,
+1, 0). OFDM symbol pattern PN
2 (+1, +1, +1, -1) corresponds to the OFDM symbol pattern P3 (+1, -1, +1, 0). OF
DM symbol pattern PN3 (+1, +1, -1, +
1) is an OFDM symbol pattern P5 (-1, + 1,
-1, 0).

As described above, pattern conversion section 151 converts the OFDM symbol pattern to P
, PN16 are converted into symbol patterns P1, P3, P5,..., P31 to make symbol patterns with smaller peak power. Then, the OFDM symbol having the small peak power is
04.

On the other hand, the pattern conversion section 161 of the demapping section 109 performs processing opposite to the processing of the pattern conversion section 151 of the mapping section 103. That is, the pattern conversion section 161 uses the correspondence table shown in FIG. 4 to convert the ternary symbol patterns “+1”, “−1”, and “0” into the binary symbols “+1” and “−1”. Convert to a pattern.

In the above mapping process, a new O
From the 32 patterns of FDM symbol patterns, 16 patterns are selected in ascending order of peak power, and the conventional OFDM
By converting from the 16 symbol patterns, the average value of the peak power can be reduced.

As described above, according to the multicarrier communication apparatus of the present embodiment, each OFDM symbol (first OFDM symbol group) converted into parallel after digital modulation.
Is output to the mapping unit, where the OFDM symbol superimposed on a predetermined number of subcarriers among a plurality of subcarriers f1 to f4 on which the first OFDM symbol group is superimposed during the inverse fast Fourier transform is set to 0, and The symbol space is expanded, and the same number of OFDM symbols as the number of the first OFDM symbol group are selected from the symbol patterns in this space in order from the one with the smallest peak power.
A first OFDM symbol group is associated with an FDM symbol, a selected OFDM symbol associated with the first OFDM symbol group is output, and the transmission apparatus is configured to perform inverse fast Fourier transform on the selected OFDM symbol.

That is, by setting some of the subcarriers f1 to f4 to have an amplitude of 0, the pattern of the OFDM symbol increases, that is, the signal space becomes large. If the required number is selected and used for transmission, a symbol pattern with a large peak power is not used, and as a result,
The signal peak voltage can be suppressed with a simple device configuration without deteriorating the transmission characteristics and without increasing the size of the device.

Further, the receiving apparatus performs a fast Fourier transform on the received OFDM symbols subjected to the inverse fast Fourier transform from the transmitting apparatus, and each OFDM symbol obtained by the transform is subjected to a selected OFDM symbol in the transmitting apparatus by a demapping unit.
The OFDM symbol matched with the first pattern data equal to the symbol is associated with the second pattern data equal to the first OFDM symbol group in the transmitting means, and the OFD symbol obtained by this association is obtained.
The M symbols are converted into serial data, and the serial data is demodulated. This makes it possible to properly demodulate the OFDM symbol from the transmitting device.

Next, another example of the mapping according to the present invention will be described. Here, an operation of mapping an unconverted OFDM symbol including five subcarriers to a converted OFDM symbol including four subcarriers will be described.

FIG. 5 shows a combination of pre-conversion OFDM symbol patterns consisting of five subcarriers. This pre-conversion OFDM symbol pattern consists of 32 combinations.

As described above, FIG. 3 shows a combination of converted OFDM symbols when one of the four subcarriers can have a value of amplitude “0”. This OFDM symbol consists of 32 combinations. Therefore, the 32 patterns of the pre-conversion OFDM having 5 subcarriers can correspond to the 32 patterns of the post-conversion OFDM on a one-to-one basis.

That is, as shown in FIG.
DM symbol pattern (+1, +1, +1, +1, +
1) is a converted OFDM symbol pattern (+1, +
1, + 1,0). The pre-conversion OFDM symbol pattern (+1, +1, +1, +1, -1) is
It corresponds to the FDM symbol pattern (+1, +1, -1, 0). OFDM symbol pattern before conversion (+1, +
1, + 1, -1, + 1) correspond to the converted OFDM symbol pattern (+ 1, -1, + 1,0). Similarly 3
The two pre-conversion OFDM symbol patterns correspond to the 32 post-conversion OFDM symbol patterns on a one-to-one basis.

The pattern conversion section 151 converts the OFDM symbol pattern according to the correspondence table shown in FIG. 6, and the pre-conversion OFDM symbol including five subcarriers is converted into the OFDM symbol including four subcarriers.
Convert to

On the other hand, when the converted OFDM symbol composed of four subcarriers is to be de-mapped to the pre-conversion OFDM symbol composed of five subcarriers, the pattern conversion section 161 of the demapping section 109 performs the processing shown in FIG.
The symbol pattern is converted in accordance with the correspondence table shown in (1), and the converted OFDM symbol having four subcarriers is converted into the pre-conversion OFDM symbol having five subcarriers.

According to such a mapping method, by using a symbol pattern including an amplitude “0” as a subcarrier, peak power can be suppressed and 1OFDM
Since the number of symbol patterns per channel increases, that is, the signal space increases, the amount of data per OFDM can be increased, and high-speed transmission can be performed.

As described above, according to the multicarrier communication apparatus of the present embodiment, some of the subcarriers have an amplitude of 0 and the pattern of symbol data increases, that is, the symbol data space increases, so that A symbol pattern with large power is not used. As a result, the signal peak voltage can be suppressed with a simple device configuration without deteriorating the transmission characteristics and without increasing the size of the device.

According to the multicarrier communication apparatus of the present embodiment, transmission is performed in the first symbol sequence including the first symbol in which at least one of the in-phase component and the quadrature component has an amplitude of 0. Multi-carrier communication can be performed in a suppressed state.

Further, according to the multicarrier communication apparatus of the present embodiment, the first and second symbol patterns can be easily collated, and demapping can be performed efficiently. As a result, the symbol data of the transmitted multicarrier signal can be properly demodulated.

Further, according to the multicarrier communication apparatus of the present embodiment, the first and second symbol patterns can be easily collated, and the mapping can be performed efficiently.

(Embodiment 2) FIG. 7 is a block diagram showing a configuration of a multicarrier communication apparatus according to Embodiment 2 of the present invention. However, components having the same configuration as in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

In the present embodiment, demapping section 201 is provided with pattern matching section 251 for matching symbol patterns, table storage section 252 storing a symbol pattern correspondence table, and retransmission when symbol patterns do not correspond. A case will be described in which a retransmission request unit 253 for requesting the data and a pattern conversion unit 254 for converting the symbol pattern are requested, and retransmission is requested when there is an error in the symbol data.

Hereinafter, the operation of the multicarrier communication apparatus according to Embodiment 2 will be described with reference to FIG. The radio signal is
The signal is input to the wireless receiving unit 107 through the antenna 106, down-converted and converted to analog-to-digital by the wireless receiving unit 107, fast Fourier-transformed by the FFT unit 108, and output to the pattern matching unit 251 of the demapping unit as received OFDM symbol data. Is done.

In pattern matching section 251, received OFDM
The symbol data is compared with a symbol table with reference to a correspondence table of a table storage unit 252 to check whether the symbol data is a symbol pattern. If the symbol data is supported, a received OFDM symbol is output to a pattern conversion unit 254. The retransmission request is instructed to the retransmission request unit 253.

In the retransmission request section 253, the pattern matching section 2
In accordance with the instruction from 51, a control signal requesting retransmission is output to digital modulation section 101. Also, the pattern conversion unit 254 refers to the correspondence table and
M symbol data is converted into an OFDM symbol before conversion,
Output to P / S converter 110.

An explanation will be given of error detection in the multicarrier communication apparatus shown in FIG.

The radio signal is input to radio reception section 107 through antenna 106, down-converted and converted to analog-to-digital by radio reception section 107,
Fast Fourier transform is performed in FT section 108 and output to pattern matching section 251 as received symbol data.

The received symbol data is stored in the pattern matching unit 2
At 51, it is checked whether the received OFDM symbol is a symbol pattern corresponding to the table storage unit 252. Since the received OFDM symbol uses a symbol pattern including the amplitude “0” in the subcarrier, the number of patterns is larger than that of a normal OFDM symbol pattern.
Some symbol patterns do not correspond.

Therefore, when the symbol is not supported, it is determined that the symbol is not correct information, and a retransmission request for the symbol is output to retransmission request section 253. In addition, when corresponding, the received OFDM symbol is output to pattern conversion section 254.

The retransmission request instruction is output to digital modulation section 101 as a retransmission request signal in retransmission request section 253, and is transmitted to the transmitting side device together with the transmission data. The radio signal transmitted again in response to the retransmission request is output to demapping section 201 as a received OFDM symbol, and the received OFDM symbol is stored in table storage section 25 again.
2 is checked to see if it is a symbol pattern.

Reception O output to pattern conversion section 254
The FDM symbol is converted into serial data by P / S conversion section 110 and demodulated into reception data by digital demodulation section 111.

As described above, according to the multicarrier communication apparatus of the present embodiment, even if received symbol data is erroneous during transmission or the like, it is possible to receive error-free symbol data by retransmission.

(Embodiment 3) In this embodiment, a case where error correction is performed when a received OFDM symbol is incorrect will be described.

FIG. 8 is a block diagram showing a configuration of a multicarrier communication apparatus according to Embodiment 3 of the present invention. However, components having the same configuration as in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

In the configuration shown in FIG.
01 is a pattern matching unit 351 for checking a symbol pattern with reference to a correspondence table, a table storage unit 352 storing a symbol pattern correspondence table, an error correction unit 353 for correcting an erroneous symbol pattern, and a correspondence table. Therefore, it is composed of a pattern conversion unit 354 for converting a symbol pattern.

The pattern matching section 351 checks whether or not the received OFDM symbol is the symbol pattern of the corresponding table stored in the table storage section 352, and if so, converts the received OFDM symbol into the pattern conversion section 35.
4 and the error correction unit 353
Performs error correction of the symbol. As the error correction in the error correction unit 353, for example, an erroneous OFDM symbol pattern is compared with the symbol pattern of the correspondence table stored in the table storage unit 352, and the closest symbol pattern is selected. I do.

The pattern conversion section 354 converts the received OFDM symbol data into a pre-conversion OFDM symbol,
Output to S conversion section 110.

[0159] Error correction in multicarrier communication will be described with reference to FIG.

[0160] The radio signal is input to radio receiving section 107 via antenna 106, down-converted and converted to analog-digital by radio receiving section 107,
Fast Fourier transform is performed in FT section 108 and output to pattern matching section 351 as received symbol data.

The received symbol data is stored in the pattern matching unit 3
At 51, it is checked whether the received OFDM symbol is a symbol pattern corresponding to the table storage unit 352. If not, this symbol is determined to be not a correct symbol and output to the error correction unit 353. The error correction unit 353 selects a symbol pattern close to the symbol pattern input as an error and outputs the selected symbol pattern to the pattern conversion unit 354. Also, as a result of the comparison, if there is a correspondence, the received OFDM symbol is output to pattern conversion section 354.

The reception O output to pattern conversion section 354
The FDM symbol is converted into serial data by P / S conversion section 110 and demodulated into reception data by digital demodulation section 111.

As described above, according to the multicarrier communication apparatus of the present embodiment, even if received symbol data is erroneous during transmission or the like, error correction can be performed to receive error-free symbol data. it can.

(Embodiment 4) FIG.9 is a block diagram showing a configuration of a multicarrier communication apparatus according to Embodiment 4 of the present invention. However, components having the same configuration as in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

Referring to FIG. 9, the demapping section 401
It has a reception level measurement unit 451, a signal determination unit 452, a pattern conversion unit 453, and a table storage unit 454.

The reception level measuring section 451 is connected to the FFT section 10
8 is used to measure the reception level of each subcarrier of the received OFDM symbol, and the result is used as a signal judgment unit 452.
Output to

[0167] Signal decision section 452 makes a hard decision on the symbol from the reception level of each subcarrier, and outputs the result of this hard decision to pattern conversion section 453. Pattern conversion unit 453
Converts the symbol pattern composed of the hard decision result with reference to the correspondence table stored in the table storage unit 454. The pattern conversion unit 453
The pattern-converted OFDM symbol pattern is output to P / S conversion section 110.

Next, the operation of the multicarrier communication apparatus according to Embodiment 4 will be described. The wireless signal sent from the transmitting side device is down-converted in the wireless receiving unit 107, analog-to-digital converted, fast Fourier-transformed in the FFT unit 108, and output to the reception level measuring unit 451 as received symbol data.

[0169] Receiving level measuring section 451 measures the receiving level of the symbol, and outputs the result to signal judging section 452. The received symbol data is hard-decided by the signal decision unit 452 by a threshold decision of the reception level, and a symbol pattern is determined. This symbol pattern is output to the pattern conversion unit 453 as converted symbol data. The method of hard decision will be described later.

The converted symbol data is converted by the pattern conversion section 453 into pre-conversion symbol data according to the correspondence table stored in the table storage section 454. The pre-conversion symbol data is converted into parallel data by the P / S conversion section 110 and demodulated into reception data by the digital demodulation section 111.

Next, an example of a symbol pattern determination operation in signal determination section 452 will be described. here,
The binary symbol pattern of “+1” and “−1” is changed to “+”
A case will be described where it is determined that the symbol pattern is converted into a ternary symbol pattern of "1", "-1", and "0", and the symbol pattern is +1, -1, 0, and -1.

Since the signal determination section 452 determines the ternary symbol pattern based on the reception level, as shown in FIG. 10, the ternary threshold value determination is performed using two thresholds of 1/3 and-／. I do. Therefore, when the reception level is equal to the threshold "1
/ 3 ", the symbol pattern is" +1 "
Is determined, the symbol pattern is determined to be “−1” when the threshold value is smaller than “−1/3”, and the symbol pattern is determined when the threshold value is smaller than the threshold value “−1/3” and larger than the threshold value “− ／”. Is determined to be “0”.

That is, the reception level of the symbol pattern of subcarrier f1 is “1.1”, and the threshold level is “1/1”.
Since it is larger than "3", the symbol pattern is determined to be "+1". The reception level of the symbol pattern of the subcarrier f2 is “−0.8”, which is smaller than the threshold value “− ／”, so that the symbol pattern is determined to be “−1”. The reception level of the symbol pattern of the subcarrier f3 is “0.1”, which is smaller than the threshold “1/3”.
Since it is larger than the threshold value “− ／”, the symbol pattern is determined to be “0”. The reception level of the symbol pattern of the subcarrier f4 is “−0.4”, which is smaller than the threshold value “− ／”.
1 ". Thus, the symbol pattern is determined.

As described above, by providing two thresholds and hard-deciding the symbol of the symbol pattern based on the reception level, a digital signal having three values can be determined. This makes it possible to accurately determine a new ternary symbol pattern.

As described above, according to the multicarrier communication apparatus of the present embodiment, it is possible to accurately determine a symbol pattern including a symbol of amplitude 0.

Next, another example of the symbol pattern determination operation in signal determination section 452 will be described. In this case, it is determined whether a binary symbol pattern of “+1” or “−1” has been converted into a ternary symbol pattern of “+1”, “−1” or “0”. Is +1, -1, 0, -1.

In this determination, the transmitting side apparatus reports symbol pattern information indicating how many amplitudes “0” are included in the symbol pattern. In accordance with this symbol pattern information, signal determination section 452 first assigns a “0” value to a symbol having a reception level close to “0” value.
Perform the times judgment. Next, a second determination is made to assign “+1” and “−1” values only by determining the polarity of the reception level for the remaining symbols. Note that the number of amplitudes “0” included in the symbol pattern may be determined in advance, and the notification of the symbol pattern information may not be required.

More specifically, as shown in FIG. 11, when the symbol pattern of one subcarrier takes a value of “0” among the symbol patterns composed of four subcarriers, that is, as the symbol pattern information, When a control signal indicating that there is only one symbol having a value of “0” is transmitted from the transmitting apparatus, the absolute value of the reception level is f3 which is the smallest.
Is determined to be “0”.

Since there is one symbol pattern having a value of “0”, the symbols of the remaining subcarriers can be determined by the sign of the reception level. Therefore, f
1 can be determined as “+1”, f2 can be determined as “−1”, and f4 can be determined as “−1”. As described above, the two-stage determination, that is, the amplitude determination is performed for the known “0” symbol, and the polarity determination is performed for the other symbols to determine the symbol pattern. Here, the amplitude determination means determining the absolute value and the polarity of the symbol, and here refers to determining "+1", "0", and "-1". The polarity determination simply means determining the polarity.

Similarly, when m of the symbols composed of n subcarriers take a value of “0”, the absolute values of the reception levels are compared, and the M symbols with the smallest value are replaced with “0”. , And the remaining nm symbols are determined to be “+1” or “−1” depending on the sign of the reception level. Thus, the symbol pattern is determined.

As described above, according to the multicarrier communication apparatus of the present embodiment, it is possible to accurately determine a symbol pattern including a symbol having an amplitude of 0 in the first determination, and to determine the polarity of another symbol in the first determination. , The symbol pattern can be determined more accurately.

(Embodiment 5) In the present embodiment, a plurality of OFDM
A case where symbol patterns are associated will be described.

FIG. 12 is a diagram showing an example of a correspondence table between the pre-conversion symbol pattern and the post-conversion symbol pattern in the pattern conversion section 151. In this example, for the sake of simplicity, both symbol patterns are sequentially PN
1 is P1 or P2, PN2 is P3 or P4, ..., P
The mapping in which N16 is associated with P31 or P32 will be described. In FIG. 12, f1 to f4 indicate the frequency of each subcarrier.

In the correspondence table shown in FIG.
FDM symbol pattern PN1 (+1, +1, +1, +
1) is an OFDM symbol pattern P1 (+ 1, + 1,
+1, 0) or P2 (+1, +1, -1, 0). OFDM symbol pattern PN2 (+1, +1, +
1, -1) is an OFDM symbol pattern P3 (+1,
-1, +1, 0) or P4 (+1, -1, -1, 0). OFDM symbol pattern PN3 (+1, +
1, -1, +1) is the OFDM symbol pattern P5
(-1, + 1, + 1,0) or P6 (-1, + 1,-
1, 0).

As described above, pattern conversion section 151 converts the OFDM symbol pattern to P
, P3 from N1, PN2, PN3,..., PN16 to the symbol patterns P1, P3, P5, P7, P9, P11,.
1 or P2, P4, P6, P8, P10, P12,
..., converted to P32. Then, the OFDM symbol is output to IFFT section 104.

On the other hand, the pattern conversion section 161 of the demapping section 109 performs processing opposite to the processing of the pattern conversion section 151 of the mapping section 103. That is, the pattern conversion unit 161 uses the correspondence table shown in FIG. 12 to convert the ternary symbol patterns “+1”, “−1”, and “0” into the binary symbols “+1” and “−1”. Convert to a pattern.

For example, the symbol pattern PN1 (+1,
+1, +1, +1) converted symbol pattern P1
Among (+1, +1, +1, 0), the subcarrier f3 is affected by fading or the like, and the symbol is P2 (+1, +
In the case of changing to (1, -1, 0), the symbol P2 (+1, +1, -1, 0) changed on the receiving side is converted into a symbol pattern PN1 (+1, +1, +1, +1), which is regarded as a correct symbol pattern. Can be received.

As described above, according to the multicarrier communication apparatus of the present invention, when an error occurs in a transmitted symbol due to the effect of fading or the like, it is received as one of a plurality of symbols corresponding to the transmitted data. The correct symbol can be received.

A plurality of OFDM symbol patterns associated with a conventional OFDM symbol pattern can be associated with a pattern in which the Euclidean distance between the symbols is shorter than other OFDM symbol patterns.

In this case, by associating symbol patterns having shorter Euclidean distances with one conventional OFDM pattern, even if a symbol changes due to a path such as fading, it can be distinguished from other symbols. it can.

(Embodiment 6) In the present embodiment, a plurality of OFDM
Multiple OFDM corresponding symbol patterns
A case where symbol patterns are transmitted alternately will be described.

FIG. 13 is a diagram showing an example of a correspondence table between the symbol pattern before conversion and the symbol pattern after conversion in the pattern conversion section 151. In this example, for the sake of simplicity, both symbol patterns are sequentially PN
1 is P1 or P9, PN2 is P3 or P11,.
The mapping in which PN16 is associated with P31 or P24 will be described. In FIG. 13, f1 to f4 are:
Indicates the frequency of each subcarrier.

In the correspondence table shown in FIG.
FDM symbol pattern PN1 (+1, +1, +1, +
1) is an OFDM symbol pattern P1 (+ 1, + 1,
+1, 0) or P9 (+1, +1, 0, +1). OFDM symbol pattern PN2 (+1, +1, +
1, -1) is an OFDM symbol pattern P3 (+1,
-1, +1, 0) or P11 (+1, -1, 0, +1)
Corresponding to OFDM symbol pattern PN3 (+1,
+1, -1 and +1) are OFDM symbol patterns P5
(-1, +1, +1, 0) or P13 (-1, +1,
0, +1).

As described above, the pattern conversion section 151 converts the OFDM symbol pattern from PN1, PN2, PN3,..., PN16 to symbol patterns P1, P3, P5, P7,.
In the next symbol conversion operation, the OFDM symbol pattern is converted from PN1, PN2, PN3,..., PN16 to symbol patterns P9, P11, P13, P15,. Then, the OFDM symbol is output to IFFT section 104.

On the other hand, the pattern conversion section 161 of the demapping section 109 performs processing opposite to the processing of the pattern conversion section 151 of the mapping section 103. That is, the pattern conversion unit 161 uses the correspondence table shown in FIG. 13 to convert the ternary symbol patterns “+1”, “−1”, and “0” into the binary symbols “+1” and “−1”. Convert to a pattern.

As described above, the conventional OFDM symbol pattern 16 pattern is replaced with the new OFDM symbol pattern 3
The received symbol is converted into 16 of the two patterns and transmitted, and the received symbol is converted from the OFDM symbol pattern 32 pattern to the conventional OFDM symbol pattern 16 pattern, and any one of P1, P3, P5, P7,. After transmitting the symbol pattern, P2, P4,
One of the symbol patterns P6, P8,..., P32 is transmitted, and then P1, P3, P5, P
7, any of P31 is transmitted.

As described above, according to the multi-carrier communication apparatus of the present embodiment, symbols having different subcarrier positions having amplitudes of “0” are alternately transmitted in association with each other, so that a pattern to be transmitted continuously is transmitted. Since the position of the subcarrier “0” changes between the symbols, the interference between symbols can be reduced.

The method of selecting a symbol pattern to be transmitted from a plurality of symbol patterns corresponding to the conventional OFDM symbol pattern is not limited to the above method.

For example, a symbol pattern may be selected by random numbers from a plurality of symbol patterns corresponding to the conventional OFDM symbol pattern and transmitted.

(Embodiment 7) In this embodiment, a case will be described in which a plurality of subcarriers of amplitude "0" are combined and used as one pattern.

FIG. 14 is a diagram showing a new OFDM symbol pattern. This O consisting of six subcarriers
The FDM symbol pattern consists of 64 symbol patterns, and FIG. 14 shows 16 symbol patterns out of the 64 symbol patterns. This symbol pattern includes a symbol pattern in which two subcarriers having an amplitude of “0” are paired.

FIG. 15 is a diagram showing an example of a correspondence table between the pre-conversion symbol pattern and the post-conversion symbol pattern in the pattern conversion section 151. In this example, for the sake of simplicity, both symbol patterns are sequentially PN
The mapping in which 1 corresponds to P101, PN2 corresponds to P102,..., PN16 corresponds to P116 will be described. In FIG. 15, f1 to f6 indicate the frequency of each subcarrier.

In the correspondence table shown in FIG.
FDM symbol pattern PN1 (+1, +1, +1, +
1) is an OFDM symbol pattern P101 (+1, +
1, 0, +1, +1, 0). OFDM symbol pattern PN2 (+1, +1, +1, -1)
DM symbol pattern P102 (+1, +1, 0, +
1, 1, 0). The OFDM symbol pattern PN3 (+1, +1, -1, +1) is combined with the OFDM symbol pattern P103 (+1, +1, 0, -1, +1,
0).

[0204] These OFDM symbol patterns are a set of two subcarriers having an amplitude of "0". For example, a symbol pattern whose amplitude value of subcarriers f1 and f4 is “0”, a symbol pattern whose amplitude value of subcarriers f2 and f5 is “0”, and a symbol pattern whose amplitude value of subcarriers f3 and f6 is “0” Symbol patterns are possible.

Thus, pattern conversion section 151 converts the OFDM symbol pattern to P
, PN16 are converted into symbol patterns P101, P102, P103,..., P116. Then, the OFDM symbol is transmitted to the IFFT unit 1
04.

On the other hand, the pattern conversion section 161 of the demapping section 109 performs processing opposite to the processing of the pattern conversion section 151 of the mapping section 103. That is, the pattern conversion unit 161 uses the correspondence table shown in FIG. 15 to convert the ternary symbol patterns “+1”, “−1”, and “0” into the binary symbols “+1” and “−1”. Convert to a pattern.

As described above, according to the multicarrier communication apparatus of the present embodiment, the conventional OFDM symbol pattern 16 pattern is converted into a new OFDM symbol pattern 16 and transmitted, and the received symbol is converted to the OFDM symbol pattern.
By converting the symbol pattern 16 pattern into the conventional OFDM symbol pattern 16 pattern, P101, P10
2, one of the symbol patterns P103, P104,.

For example, the symbol pattern P101 (+
1, +1, 0, +1, +1, 0) are transmitted, and some values of the subcarriers change due to the influence of the path, and the symbol of (+1, +1, 0, 0, +1, 0) is received on the receiving side. When received in a pattern, the combination of subcarriers whose amplitude is determined to be “0” is compared.

The combination of subcarriers f1 and f4 is
The values are “+1” and “0”, and the subcarriers f3 and f6
Are the values of “0” and “0”, and the multicarrier communication apparatus determines that the most appropriate one from the symbol pattern in which the combination of the subcarriers f3 and f6 has the amplitude “0” is the received symbol pattern. I do.

As described above, according to the multicarrier communication apparatus of the present embodiment, by combining a plurality of subcarriers of amplitude “0” and using them as one pattern, the multicarrier communication apparatus is affected by a path such as fading. Even when the signal changes, communication with less errors can be performed by judging from the positions of the subcarriers whose amplitudes are “0”.

[0211] Further, the receiving apparatus performs a fast Fourier transform on the received OFDM symbol subjected to the inverse fast Fourier transform from the transmitting apparatus, and each OFDM symbol obtained by this transform is selected by the demapping unit at the selected OFDM symbol in the transmitting apparatus.
The OFDM symbol matched with the first pattern data equal to the symbol is associated with the second pattern data equal to the first OFDM symbol group in the transmitting means, and the OFD symbol obtained by this association is obtained.
The M symbols are converted into serial data, and the serial data is demodulated. This makes it possible to properly demodulate the OFDM symbol from the transmitting device.

(Embodiment 8) In this embodiment, a case will be described where the Euclidean distance between patterns is increased by the position of a subcarrier having an amplitude of "0".

In multi-carrier communication, there is a Euclidean distance as a guide for determining a symbol pattern. The Euclidean distance between a symbol having an amplitude of “+1” and a symbol having an amplitude of “−1” in a certain subcarrier is 2.

On the other hand, the Euclidean distance between a symbol whose amplitude is "0" and a symbol whose amplitude is "+1" is 1, and the Euclidean distance between a symbol whose amplitude is "0" and a symbol whose amplitude is "-1". Since the symbol pattern including the amplitude “0” is used, the Euclidean distance between the symbols is reduced, so that it becomes difficult to determine the signal and the transmission characteristics are deteriorated.

Therefore, the Euclidean distance is at least 2
The transmission characteristics are improved by using only the symbol patterns described above.

FIG. 16 shows an eighth embodiment according to the eighth embodiment of the present invention.
FIG. 11 is a diagram illustrating an example in which two symbols having amplitude “0” are arranged on a subcarrier. In FIG. 16, “0” indicates the amplitude “0”, and “×” indicates the amplitude “+1” or “−1”.

In pattern group 1, group 1 is a symbol pattern in which symbols of amplitude “0” are arranged on subcarriers f7 and f8.

The symbol patterns belonging to group 1 are:
Since the symbols of f1, f2, f3, f4, f5, and f6 each have at least one subcarrier and a difference between the amplitude “+1” and the amplitude “−1”, the symbol patterns belonging to group 1 are mutually Euclidean distance apart. Is at least 2 or more.

The symbol pattern belonging to group 2 is a symbol pattern in which symbols of amplitude “0” are arranged on subcarriers f5 and f6.

The symbol pattern belonging to group 2 is
Subcarriers f1, f2, f3, f4, f7,
Since the symbol f8 has at least one subcarrier and a difference between the amplitude “+1” and the amplitude “−1”, the symbol patterns belonging to group 2 have a Euclidean distance of at least 2 from each other.

Since the symbol patterns belonging to group 1 and the symbol patterns belonging to group 2 have different subcarriers in which two symbols of amplitude “0” are arranged, the symbol patterns belonging to different groups are mutually Euclidean. The distance becomes at least 2 or more.

Next, an example of symbol pattern conversion will be described. FIG. 17 is a diagram showing an example of a correspondence table between a symbol pattern before conversion and a symbol pattern after conversion in the pattern conversion section 151 according to Embodiment 8 of the present invention.

In this example, for the sake of simplicity, in both symbol patterns, PN1 becomes P101 and PN1 becomes PN1 in order.
2 is assigned to P102,..., PN256 is assigned to P356. In FIG.
f1 to f8 indicate the frequency of each subcarrier.

In the correspondence table shown in FIG.
FDM symbol pattern PN1 (+1, +1, +1, +
1, + 1, + 1, + 1, + 1) is the OFDM symbol pattern P101 (+ 1, + 1, + 1, + 1, + 1, +
1, 0, 0). OFDM symbol pattern P
N2 (+1, +1, +1, +1, +1, +1,-
1) is an OFDM symbol pattern P102 (+1, +
1, +1, +1, +1, -1, 0, 0). O
FDM symbol pattern PN3 (+1, +1, +1, +
1, +1, +1, -1, +1) are OFDM symbol patterns P103 (+1, +1, +1, +1, -1, +
1, 0, 0).

As described above, pattern conversion section 151 converts the OFDM symbol pattern to P
, PN256 are converted into symbol patterns P101, P102, P103,..., P356. Then, the OFDM symbol is output to IFFT section 104.

On the other hand, the pattern conversion section 161 of the demapping section 109 performs processing opposite to the processing of the pattern conversion section 151 of the mapping section 103. That is, the pattern conversion unit 161 uses the correspondence table shown in FIG. 17 to convert the ternary symbol patterns “+1”, “−1”, and “0” into the binary symbol patterns “+1” and “0”. Convert to

As described above, according to the multicarrier communication apparatus of the present embodiment, the conventional OFDM symbol pattern 256 pattern is replaced with the new OFDM symbol pattern 25.
6 patterns are transmitted and the received symbol is OF
Conventional OFD from 256 DM symbol patterns
Convert to M symbol pattern 256 pattern and P10
1, one of P102, P103, P104,..., P356 is transmitted.

As described above, according to the multicarrier communication apparatus of the present invention, symbol patterns having a Euclidean distance equal to or greater than a predetermined distance are associated with different conventional data patterns, and thus symbol patterns are affected by paths such as fading. Can be distinguished from other symbols.

(Embodiment 9) FIG.18 is a block diagram showing a configuration of a multicarrier communication apparatus according to Embodiment 9 of the present invention.

[0230] The multicarrier communication apparatus according to Embodiment 9 of the present invention comprises a mapping section 501, a digital modulation section 502, an S / P conversion section 503, and an IFFT section 504.
, A radio transmission unit 505, an antenna 506, a radio reception unit 507, an FFT unit 508, and a P / S conversion unit 509.
, A digital demodulation unit 510, and a demapping unit 511.

The mapping section 501 includes a pattern conversion section 551 and a table storage section 552.

The demapping unit 511 includes a pattern conversion unit 561 and a table storage unit 562.

In FIG. 18, pattern conversion section 551
Converts transmission data represented by binary values into transmission data represented by ternary values, and converts the transmission data into digital modulation section 502.
Output to The table storage unit 552 stores correspondence information between a binary transmission data pattern and a binary transmission data pattern.
The corresponding information is output according to the reference of No. 1.

[0234] The digital modulation section 502 includes a mapping section 5
The transmission data output from S 01 is digitally modulated, and the modulated transmission symbol sequence is output to S / P conversion section 503.
S / P conversion section 503 converts the transmission symbols from serial to parallel, allocates each transmission symbol to a subcarrier, and outputs the result to IFFT section 504.

[0235] IFFT section 504 performs inverse fast Fourier transform on the transmission symbol, and outputs the transmission signal after inverse Fourier transform to radio transmission section 505. The wireless transmission unit 505 converts the transmission signal from digital to analog, performs up-conversion, and transmits the converted signal via the antenna 506 as a wireless signal.

The radio signal received via antenna 506 is down-converted by radio reception section 507 to be analog-to-digital converted, and output to FFT section 508. FFT section 508 performs a fast Fourier transform of the received signal, and converts the obtained received symbol to a P / S conversion section 509.
Output to

[0237] P / S conversion section 509 performs parallel-to-serial conversion on the received symbols, combines the signals of the respective subcarriers into a received symbol sequence, and outputs the result to digital demodulation section 510. Digital demodulation section 510 demodulates the received symbol sequence and outputs the obtained reception data to pattern conversion section 561.

The pattern conversion section 561 converts received data represented by ternary data into received data represented by binary data and outputs the data. The table storage unit 562 stores correspondence information between received data represented by binary values and received data represented by ternary values, and outputs the corresponding information according to the reference of the pattern conversion unit 561.

Next, the transmission operation of the multicarrier communication apparatus having the above configuration will be described.

The transmission data is converted from two types of values “1” and “0” by the pattern conversion unit 551 based on the correspondence information stored in the table storage unit 552 from “+1” and “−”. The data is converted into transmission data having three types of values “1” and “0”, and is output to the digital modulation section 502 as transmission data represented by three values. A detailed description of this conversion operation will be described later.

The transmission data output from pattern conversion section 551 undergoes BPSK modulation in digital modulation section 502 and serial / parallel conversion in S / P conversion section 503. This data is superimposed on a plurality of subcarriers and used as a transmission symbol in IFFT section 5
04 is output.

The transmission symbol is subjected to inverse fast Fourier transform in IFFT section 504, and the signal after inverse Fourier transform is output to radio transmitting section 505. The signal after the inverse Fourier transform is subjected to digital-to-analog conversion in the wireless transmission unit 505, up-converted, and transmitted as a wireless signal through the antenna 506.

The received radio signal is down-converted into an analog-to-digital signal by radio reception section 507 through antenna 506 and output to FFT section 508.

The received signal is subjected to fast Fourier transform in FFT section 508, converted into a received symbol, converted into a received symbol sequence in P / S conversion section 509, and output to digital demodulation section 510.

The received symbol sequence is converted to a digital demodulator 510.
Are demodulated and the obtained reception data is output to the pattern conversion unit 561.

In the pattern conversion section 561, the received data has a pattern of "+1", "-"
"1", "1", "0"
The data is converted into a pattern having two kinds of values “0”, and is output as received data represented by binary values. A detailed description of the conversion operation will be described later.

Next, the conversion operation of transmission data in pattern conversion section 551 will be described. FIG. 19 is a diagram illustrating an example in which data represented by binary values is converted into data represented by ternary values.

In FIG. 19, the data before conversion is “0”.
And "1" are 4-bit data represented by binary values, and the converted ternary data is data represented by ternary values "+1", "0", and "-1".

When 4-bit data “0, 0, 0, 0” is input, pattern conversion section 551 performs the conversion based on the correspondence information stored in table storage section 552, for example, the correspondence information shown in FIG. The signal is converted into “+1, +1, +1, 0” and output to the digital modulation unit 502.

Similarly, the pattern conversion unit 551 converts the input 4-bit data “0, 0, 0, 1” into “+1, −1, +1, +1” based on the correspondence information stored in the table storage unit 552. The signal is converted to "0" and output to the digital modulation section 502.

The digital modulating section 502 modulates discrete data and converts it into a signal having a continuous amplitude. For example, when “+1” is input, a sine waveform with a predetermined frequency, a predetermined amplitude, and a predetermined phase is output, and “−” is output.
When "1" is input, a sine waveform having a predetermined frequency and a predetermined amplitude and shifted by 180 degrees from a predetermined phase is output. When "0" is input, a sine waveform having an amplitude "0" is output. Output.

In the present embodiment, input digital data represented by binary values is converted to digital data represented by ternary values and modulated, and r out of N subcarriers are selected and modulated. Then, the remaining (Nr) pieces are selected from among the N subcarriers so that the amplitude 0 is transmitted (nothing is transmitted).
The number of patterns to choose number of carriers can be obtained by _N C _r.

R gives a positive or negative value. in this case,
It can be seen that 1 OFDM symbol can be expressed in _N C _r · 2 ^r ways. In the conventional multicarrier communication, each subcarrier has only a positive or negative value, whereas in the multicarrier communication of the present invention, since each subcarrier can take 0, the signal space is large, that is, , _N C _r
• 2 ^r > 2 ^N may be possible.

As described above, in the multicarrier communication apparatus according to the present embodiment, since some of the subcarriers have amplitude 0 and the symbol data pattern increases, that is, the symbol data space increases, the peak power Large symbol patterns are not used. As a result, the signal peak voltage can be suppressed with a simple device configuration without deteriorating the transmission characteristics and without increasing the size of the device.

Further, the multicarrier communication apparatus of the present embodiment can easily collate the first and second data patterns, and can perform demapping efficiently. As a result, the symbol data of the transmitted multicarrier signal can be properly demodulated.

According to the multicarrier communication apparatus of the present embodiment, the first and second data patterns can be easily collated, and mapping can be performed efficiently.

(Embodiment 10) FIG.22 is a diagram showing a configuration of a multicarrier communication apparatus according to Embodiment 10 of the present invention.

In FIG. 22, the multicarrier communication apparatus includes n digital modulation units 601-1 to 601-n,
n mapping units 602-1 to 602-n, n spreading units 603-1 to 603-n, an adder 604, a scramble code multiplication unit 605, and an S / P conversion unit 606
, IFFT section 607, radio transmission section 608, antenna 609, radio reception section 610, FFT section 611,
P / S conversion section 612 and scramble code multiplication section 613
Mainly composed of n despreading units 614-1 to 614-n, n demapping units 615-1 to 615-n, and n digital demodulation units 616-1 to 616-n Is done.

The mapping units 602-1 to 602-n
It is composed of any one of the mapping units according to the first to eighth embodiments. Also, the demapping units 615-1 to 615-n
Is composed of the demapping unit according to any one of the first to eighth embodiments.

Digital modulation sections 601-1 to 601-n
Respectively digitally modulates transmission data, and outputs pre-conversion symbol patterns to mapping sections 602-1 to 602-n.

The mapping units 602-1 to 602-n
Correspondence information between the symbol pattern before conversion and the symbol pattern after conversion is stored, and digital modulation units 601-1 to 601-
Then, the pre-conversion symbol patterns output from n are converted into post-conversion symbol patterns, and the post-conversion symbol patterns are output to spreading sections 603-1 to 603-n.

Spreading sections 603-1 to 603-n multiply n converted symbol patterns output from mapping sections 602-1 to 602-n by different spreading codes, respectively, and output the result to adder 604.

The adder 604 includes spreading units 603-1 to 603-1.
3-n, add the n converted symbol patterns, and output one obtained transmission symbol pattern to the scramble code multiplication section 605.

[0264] Scramble code multiplication section 605 multiplies the transmission symbol pattern output from adder 604 by a scramble code different for each communication device, spreads the transmission symbol pattern, and outputs the result to S / P conversion section 606.

S / P conversion section 606 converts the transmission symbol pattern output from scramble code multiplication section 605 from serial to parallel, and converts the obtained parallel data into IF data.
Output to FT section 607.

The IFFT section 607 includes an S / P conversion section 606
Performs inverse fast Fourier transform on the parallel data output from
Output to

Radio transmitting section 608 performs digital-to-analog conversion on the transmission signal and up-converts it, and transmits
Is transmitted as a wireless signal via the.

[0268] Antenna 609 transmits the transmission signal output from radio transmission section 608, and outputs the received radio signal to radio reception section 610 as a reception signal.

Radio receiving section 610 down-converts the received signal into an analog signal, and outputs the result to FFT section 611.

[0270] FFT section 611 performs a fast Fourier transform on the received signal and outputs it to P / S conversion section 612.

[0271] P / S conversion section 612 converts the received signal from parallel to serial, combines the signals of the respective subcarriers into serial data, and outputs the serial data to scramble code multiplication section 613.

The scramble code multiplying unit 613 calculates the P / S
The serial data output from conversion section 612 is multiplied by a scramble code different for each communication device to despread the serial data, and the obtained received symbol patterns are output to despreading sections 614-1 to 614-n.

Despreading sections 614-1 to 614-n multiply received symbol patterns output from scramble code multiplying section 613 by spreading codes, despread the received symbol patterns, and demapping section 615-1. ~ 61
5-n.

Demapping units 615-1 to 615-n
Stores the correspondence information between the received symbol pattern and the pre-conversion symbol pattern, converts the received symbol pattern output from the despreading units 614-1 to 614-n into the pre-conversion symbol pattern, 616
n.

Digital demodulation units 616-1 to 616-n
Demodulates the pre-conversion symbol pattern output from the demapping units 615-1 to 615-n, and outputs received data.

Next, the operation of the multicarrier communication apparatus according to Embodiment 10 will be described. First, the operation at the time of transmission will be described.

The n transmission data are transmitted to the digital modulation section 60
1-1 to 601-n, which are digitally modulated, and are mapped as n pre-conversion symbol patterns by a mapping unit 602-1.
-602-n, and are output to the mapping units 602-1-6-2.
In 02-n, the converted symbol patterns are converted into n converted symbol patterns, which are then output to spreading sections 603-1 to 603-n.

The n converted symbol patterns are multiplied by different spreading codes in spreading sections 603-1 to 603-n, added in adder 604, and added as one transmission symbol pattern to scramble code multiplying section 60.
5 is output.

The transmission symbol pattern is multiplied by a scramble code different for each communication device in scramble code multiplication section 605, serial-parallel converted in S / P conversion section 606, inverse fast Fourier-transformed in IFFT section 607, and transmitted as a transmission signal. Output to wireless transmission section 608.

[0280] The transmission signal is subjected to digital-to-analog conversion and up-conversion in radio transmission section 608, and transmitted as a radio signal via antenna 609.

Next, the operation at the time of reception will be described. The radio signal is received via the antenna 609, down-converted and analog-converted in the radio reception unit 610, and fast Fourier-transformed in the FFT unit 611.
In the P / S converter 612, the parallel / serial conversion is performed, and the received symbol is used as a scramble code multiplier 613.
Is output to

The received symbol is multiplied by a scramble code different for each communication device in scramble code multiplying section 613 and output to despreading sections 614-1 to 614-n. Each is multiplied by a spreading code and output to the demapping units 615-1 to 615-n as n received symbol patterns.

[0283] The n received symbols are supplied to the demapping unit 6
At 15-1 to 615-n, the symbol pattern is converted to a pre-conversion symbol pattern, demodulated at digital demodulators 616-1 to 616-n, and output as received data.

Next, signal processing in the multicarrier communication apparatus according to Embodiment 10 will be described. FIG.
FIG. 28 is a diagram illustrating an example of signal processing in Embodiment 10 of the present invention.

FIG. 23A shows a symbol pattern including amplitude "0" obtained by mapping a digitally modulated symbol pattern.

FIG. 23-B shows a symbol pattern obtained by performing time domain spreading on the symbol pattern shown in FIG. 23-A. In this symbol pattern, a symbol composed of five chip components is generated by five-fold spreading.

FIG. 23-C shows an example in which the symbol pattern shown in FIG. 23-B is serial-parallel converted, distributed to subcarriers, and multiplexed.

As described above, according to the multicarrier communication apparatus of the present embodiment, a symbol pattern having a large peak power is used by performing spreading processing on a symbol converted to a symbol pattern including amplitude 0 and transmitting the symbol. Absent. As a result, the signal peak voltage can be suppressed and the frequency utilization efficiency can be increased without deteriorating the transmission characteristics and increasing the size of the device.

(Embodiment 11) FIG.24 is a diagram showing a configuration of a multicarrier communication apparatus according to Embodiment 11 of the present invention. However, components having the same configuration as in FIG. 22 are denoted by the same reference numerals, and detailed description is omitted.

The multi-carrier communication apparatus shown in FIG. 24 includes an interleaving section 651 and a de-interleaving section 652, and performs interleaving on the transmission symbols subjected to the spreading processing in units of chips and the reception symbols after the parallel-serial conversion processing. The difference is that deinterleaving is performed in chip units.

In FIG. 24, adder 604 adds n converted symbol patterns output from spreading sections 603-1 to 603-n, and outputs one obtained transmission symbol pattern to interleave section 651. Output.

The interleave section 651 includes an adder 604
The interleaving is performed on the transmission symbols output from the base station in units of spreading code chips, and the interleaved transmission symbols are output to the scramble code multiplication section 605.

[0294] Scramble code multiplication section 605 multiplies the transmission symbol pattern output from interleaving section 651 by a scramble code different for each communication device, spreads the transmission symbol pattern, and outputs the result to S / P conversion section 606.

[0294] The scramble code multiplying unit 613 calculates the P / S
The serial data output from conversion section 612 is multiplied by a scramble code different for each communication device to despread the serial data, and the resulting received symbol pattern is output to deinterleave section 652.

Deinterleaving section 652 performs deinterleaving on the received symbol pattern output from scrambling code multiplying section 613 in units of spreading code chips.
The deinterleaved received symbol pattern is output to despreading sections 614-1 to 614-n.

Despreading sections 614-1 to 614-n despread the received symbol pattern by multiplying the received symbol pattern output from deinterleaving section 652 by a spreading code, and demapping sections 615-1 to 615-n. 615-
n.

As described above, according to the multicarrier communication apparatus of the present embodiment, symbols after spreading are subjected to interleaving in chip units and transmitted, and received symbols are deinterleaved in chip units.
In the case of time interleaving, symbols can be dispersed on the time axis in chip units, and in the case of frequency interleaving, symbols can be dispersed on the frequency axis, so that communication resistant to burst errors can be performed.

[0298] Further, the multicarrier communication apparatus of the present embodiment can interleave transmission symbols multiplied by a scrambling code.

In this case, interleaving section 651 performs an interleaving process on the transmission symbol output from scramble code multiplication section 605 and outputs the result to S / P conversion section 606. Also, the deinterleave unit 652 has a P / S
Deinterleaving is performed on the serial data output from conversion section 612, and the resulting received symbols are output to scramble code multiplication section 613.

(Twelfth Embodiment) FIG. 25 is a diagram showing a configuration of a multicarrier communication apparatus according to a twelfth embodiment of the present invention. However, components having the same configuration as in FIG. 22 are denoted by the same reference numerals, and detailed description is omitted.

The multi-carrier communication apparatus shown in FIG. 25 includes n spreading units 701-1 to 701-n, an adder 702,
A mapping unit 703, a demapping unit 711, and n despreading units 712-1 to 712-n, which perform spreading processing and addition processing to perform mapping on transmission symbols code-multiplexed; The difference lies in that despreading processing is performed on the outgoing mapped reception symbols.

In FIG. 25, a digital modulation section 601-
1 to 601-n respectively digitally modulate transmission data and spread symbol patterns before conversion to spreading sections 701-1 to 70-n.
1-n.

[0303] Spreading sections 701-1 to 701-n multiply the n pre-conversion symbol patterns output from digital modulating sections 601-1 to 601-n by different spreading codes and output the result to adder 702. .

The adder 702 includes spreading units 701-1 to 701-1.
1-n, adds the n converted symbol patterns, and outputs one obtained transmission symbol pattern to mapping section 703.

[0305] Mapping section 703 stores the correspondence information between the symbol pattern before conversion and the symbol pattern after conversion,
The pre-conversion symbol pattern output from the adder 702 is converted into a post-conversion symbol pattern, and the post-conversion symbol pattern is output to the scramble code multiplication unit 605.

[0306] Scramble code multiplication section 605 multiplies the transmission symbol pattern output from mapping section 703 by a scramble code different for each communication device, spreads the transmission symbol pattern, and outputs the result to S / P conversion section 606.

As described above, according to the multicarrier communication apparatus of the present embodiment, a symbol pattern having a large peak power is converted by converting the symbol pattern after the spreading process into a symbol pattern including amplitude 0 and transmitting the symbol pattern. Not used. As a result, it is possible to suppress the peak voltage of the signal and increase the frequency use efficiency with a simple device configuration without deteriorating the transmission characteristics and increasing the size of the device.

(Embodiment 13) FIG.26 is a diagram showing a configuration of a multicarrier communication apparatus according to Embodiment 13 of the present invention. However, components having the same configuration as in FIG. 22 are denoted by the same reference numerals, and detailed description is omitted.

The multi-carrier communication apparatus shown in FIG. 26 has n S / P converters 801-1 to 801-n, n spreaders 802-1 to 802-n, and adders 803-1 to 80-80.
3-4, a scramble code multiplication unit 804, a scramble code multiplication unit 811 and n despreading units 812-1 to 812-1.
812-n and n P / S converters 813-1 to 813
-N, and performs spreading processing on a parallel pattern symbol pattern obtained by serial-to-parallel conversion of the mapped symbol pattern including "0", and multiplies the symbol pattern obtained by adding each parallel sequence data by a scrambling code. In that diffusion processing is performed.

In FIG. 26, mapping section 602-1
602-n store the correspondence information between the symbol pattern before conversion and the symbol pattern after conversion,
The pre-conversion symbol patterns output from 1-1 to 601-n are respectively converted into post-conversion symbol patterns, and the post-conversion symbol patterns are converted into S / P conversion units 801-1 to 801.
Output to -n.

The S / P converters 801-1 to 801-n
The converted symbol pattern output from the demapping units 602-1 to 602-n is subjected to serial-parallel conversion, and the obtained parallel sequenced symbol pattern is spread by the spreading unit 802-1.
To 802-n.

The diffusing units 802-1 to 802-n are S / P
The parallelization symbol patterns output from the conversion units 801-1 to 801-n are multiplied by different spreading codes, and output to the adders 803-1 to 803-4, respectively. The spreading code to be multiplied here uses the same spreading code for the symbol pattern output from the same S / P converter, and uses a different spreading code for each S / P converter.

Adders 803-1 to 803-4 add n converted symbol patterns output from spreading sections 802-1 to 802 -n, and add the obtained transmission symbol patterns to scramble code multiplication sections. 804.

The scramble code multiplication section 804 multiplies transmission symbol patterns output from the adders 803-1 to 803-4 by different scramble codes, respectively.
The transmission symbol pattern is spread and output to IFFT section 607.

[0315] IFFT section 607 performs inverse fast Fourier transform on the transmission symbol pattern output from scramble code multiplication section 804, and outputs the transmission signal after inverse Fourier transform to radio transmission section 608.

[0316] FFT section 611 performs fast Fourier transform on the received signal and outputs the result to scramble code multiplication section 811.

[0317] The scramble code multiplication unit 811 performs FFT processing.
The parallel data output from the section 611 is multiplied by the scrambling code multiplied at the time of transmission, and despread, and the obtained received symbol patterns are despreaded by despreading sections 812-1 to 81-8
12-n.

Despreading sections 812-1 to 812-n multiply the received symbol patterns output from scramble code multiplying section 811 by spreading codes, respectively, to despread the received symbol patterns, and to generate n P / Ss. Conversion unit 813-1-1
813-n.

The P / S converters 813-1 to 813-n are
The received symbol patterns output from despreading sections 812-1 to 812-n are converted from parallel to serial and output to demapping sections 615-1 to 615-n.

Demapping units 615-1 to 615-n
Stores P / S conversion sections 813-1 to 813-
n is converted into a symbol pattern before conversion, and the digital demodulation units 616-1 to 61-1
6-n.

Next, signal processing in the multicarrier communication apparatus according to Embodiment 13 will be described. FIG.
FIG. 35 is a diagram illustrating an example of signal processing in Embodiment 13 of the present invention.

FIG. 27-A shows a symbol pattern including amplitude "0" obtained by mapping a digitally modulated symbol pattern.

FIG. 27B shows an example in which the symbol pattern shown in FIG. 27A is converted from serial to parallel, distributed to subcarriers, and multiplexed.

FIG. 27C is a symbol pattern obtained by performing time domain spreading on the symbol pattern shown in FIG. 27B. In this symbol pattern, a symbol composed of five chip components is generated by five-fold spreading.

As described above, according to the multicarrier communication apparatus of the present embodiment, a symbol pattern having a large peak power is used by performing spreading processing on a symbol converted to a symbol pattern including amplitude 0 and transmitting the symbol. Absent. As a result, the signal peak voltage can be suppressed and the frequency utilization efficiency can be increased without deteriorating the transmission characteristics and increasing the size of the device.

Further, the multicarrier communication apparatus according to the present embodiment can perform spreading processing on a symbol pattern of a parallel sequence subjected to serial / parallel conversion, and perform mapping on a symbol pattern obtained by adding each parallel sequence data.

(Embodiment 14) FIG.28 is a diagram showing a configuration of a multicarrier communication apparatus according to Embodiment 14 of the present invention. However, components having the same configuration as in FIG. 22 or FIG. 26 are denoted by the same reference numerals, and detailed description is omitted.

The multi-carrier communication apparatus shown in FIG. 28 has n spreaders 901-1 to 901-n and n despreaders 9
11-1 to 911-n and n S / P converters 902-
1-902-n, diffusion units 903-1 to 903-n,
26 in that spreading processing is performed on the mapped symbol pattern including “0”, and serial-parallel conversion is performed on the spreading-processed symbol pattern.

Referring to FIG. 28, mapping section 602-1
602-n store the correspondence information between the symbol pattern before conversion and the symbol pattern after conversion,
The pre-conversion symbol patterns output from 1-1 to 601-n are converted into post-conversion symbol patterns, respectively, and the post-conversion symbol patterns are output to spreading sections 901-1 to 901-n.

[0330] Spreading sections 901-1 to 901-n multiply and spread the converted symbol pattern output from mapping sections 602-1 to 602-n by a spreading code. 902-n.

The S / P conversion units 902-1 to 902-n
The converted symbol patterns output from spreading sections 901-1 to 901-n are subjected to serial-to-parallel conversion, and the obtained parallel-sequenced symbol patterns are spread to spreading sections 903-1 to 903.
Output to -n.

The diffusion units 903-1 to 903-n are provided with S / P
The parallel sequence symbol patterns output from the conversion units 902-1 to 902-n are multiplied by different spreading codes, and output to the adders 803-1 to 803-4, respectively. The spreading code to be multiplied here uses the same spreading code for the symbol pattern output from the same S / P converter, and uses a different spreading code for each S / P converter.

The spreading code multiplied by spreading sections 903-1 to 903-n is different from the spreading code multiplied by spreading sections 901-1 to 901-n.

Adders 803-1 to 803-4 add n converted symbol patterns output from spreading sections 903-1 to 903 -n, and add the obtained transmission symbol patterns to scramble code multiplication sections. 804.

The scramble code multiplying unit 811 performs the FFT
The parallel data output from the unit 611 is multiplied by the scramble code multiplied at the time of transmission, and despread, and the obtained received symbol patterns are despread by the despreading units 911-1 to 91-1
11-n.

Despreading sections 911-1 to 911-n despread the received symbol pattern by multiplying the received symbol pattern output from scramble code multiplying section 811 by a spreading code, respectively, and perform n P / S Conversion section 912-1-1
912-n.

The P / S conversion units 912-1 to 912-n
The received symbol patterns output from despreading sections 911-1 to 911-n are converted from parallel to serial to despreading section 9
13-1 to 913-n.

The despreading sections 913-1 to 913 -n are connected to P /
The received symbol patterns output from the S conversion units 912-1 to 912-n are multiplied by the spreading code and output to the demapping units 615-1 to 615-n, respectively.

The demapping units 615-1 to 615-n
Stores P / S conversion sections 813-1 to 813-
n is converted into a symbol pattern before conversion, and the digital demodulation units 616-1 to 61-1
6-n.

As described above, according to the multicarrier communication apparatus of the present embodiment, a symbol pattern having a large peak power is used by performing spreading processing on a symbol converted into a symbol pattern including amplitude 0 and transmitting the symbol. Absent. Further, by multiplying the spread signal by using a different code for each communication device, it is possible to perform transmission using the same band by a plurality of transmitters. As a result, without deteriorating the transmission characteristics and without increasing the size of the device,
It is possible to suppress the peak voltage of the signal and increase the frequency use efficiency.

Further, the multicarrier communication apparatus according to the present embodiment can rearrange transmission signals in the order of subcarriers and the order of transmission time in units of chips. FIG. 29 is a diagram illustrating an example of signal processing in Embodiment 14 of the present invention.

FIG. 29A shows a symbol pattern including amplitude "0" obtained by mapping a digitally modulated symbol pattern.

FIG. 29B is a symbol pattern obtained by performing time domain spreading on the symbol pattern shown in FIG. 29A. FIG. 29C is a symbol pattern obtained by performing frequency domain spreading on the symbol pattern shown in FIG. 29A.

The multi-carrier communication apparatus according to Embodiment 14 of the present invention performs time-domain spreading and frequency-domain spreading, and as shown in FIG. 29-D, a symbol spread two-dimensionally on the time axis and the carrier frequency axis. A pattern can be generated, and interleaving can be performed on this symbol pattern in two-dimensional units on a time axis and a carrier frequency axis in a chip unit. FIG.
9-E indicates a symbol pattern subjected to the interleaving.

As described above, by performing interleaving in units of chips in two dimensions of the time axis and the carrier frequency axis, symbols can be dispersed in units of chips on the time axis and the frequency axis. Communication that is resistant to selective fading can be performed.

In the first to fourteenth embodiments, the values “+1” and “−1” obtained by performing BPSK modulation on data are replaced with “+”.
Although the case of converting into three values of “1”, “−1”, and “0” has been described, the present invention is not limited to this, and QP
SK modulation or the like is performed, and the two values of “+1” and “−1” are changed to “+” for one or both of the in-phase component and the quadrature component.
It is also possible to convert to three values of "1", "-1", and "0".

For example, mapping is performed so that the signal point arrangement of the normal QPSK modulation as shown in FIG. 20A is changed to the signal point arrangement of the QPSK modulation as shown in FIG. In this case, the determination in the case of BPSK modulation is performed for each of the in-phase component and the quadrature component. That is, for each of the in-phase component and the quadrature component of each subcarrier component, ternary determination of the amplitude is performed, or the required number of amplitudes is determined to be 0, and the remaining portion is determined to be the polarity. As a result, similarly to the case of BPSK modulation, the number of symbol patterns per OFDM increases, that is, the signal space increases, so that the peak power can be reduced by using a pattern with a small peak power, 1
High-speed transmission can also be performed by increasing the amount of data per OFDM.

The present invention is not limited to this.
6QAM or the like is performed, and three values of “+3”, “+1”, “−1”, and “−3” for one or both of the in-phase component and the quadrature component are respectively “+3”, “+1”, “−1”, "-
It is also possible to convert it into five values of “3” and “0”.

For example, mapping is performed so that the signal point arrangement of 16QAM as shown in FIG. 21B is changed from the signal point arrangement of normal 16QAM as shown in FIG. In this case, in each of the in-phase component and the quadrature component of each subcarrier component, the required number of amplitudes is determined to be 0, and the rest are determined to be quaternary in amplitude. Thus, as in the case of BPSK modulation, the number of symbol patterns per OFDM increases, that is, the signal space increases, so that the data amount per OFDM can be increased and high-speed transmission can be performed.

Although Embodiments 1 to 14 describe the case where each subcarrier component is determined one by one by amplitude determination, in the present invention, the entire symbol pattern (for example, Alternatively, the present invention can be applied to the case where the determination is performed using a symbol pattern of four subcarriers (a component of all four subcarriers).

For example, channel estimation is performed using a known signal such as a pilot symbol, and the obtained channel estimation value is multiplied by each symbol pattern to generate a replica signal of the received symbol pattern. Then, the replica signal is compared with the received symbol pattern, and the most similar replica signal is determined as the transmitted symbol pattern. The determination as to whether or not it is the closest is performed by comparing the replica signal with the received symbol pattern for each subcarrier component to obtain a difference, and determining the symbol pattern corresponding to the replica signal having the smallest cumulative difference in the transmitted symbol pattern. And the like.

In this case, it is possible to judge the symbol patterns collectively, so that a more accurate symbol pattern can be determined.

In the first to fourteenth embodiments, the case where the transmitting device and the receiving device are installed in the same device has been described. In the present invention, however, the mapping of the present invention is applied to the transmitting device. If the multi-carrier communication device having a unit is installed, and the multi-carrier communication device having the demapping unit according to the present invention is installed in the receiving device, the transmitting device and the receiving device are in the same device. It does not have to be installed.

The present invention is not limited to the first to fourteenth embodiments, but can be implemented with various modifications. For example, the number of thresholds and the number of subcarriers in Embodiments 1 to 14 are not particularly limited.

In the twelfth to twelfth embodiments, chip interleaving can be performed on the spread symbol sequence. In this case, the symbol sequence for performing chip interleaving may be subjected to spreading code processing, and chip interleaving may be performed by providing an interleaving section between the spreading section and the IFFT section of the multicarrier communication apparatus according to Embodiments 12 to 14. It can be carried out.

Also, in Embodiments 12 to 14, the multicarrier communication apparatus can provide chip interleaving for each symbol sequence that has been subjected to spreading processing before multiplexing by providing a plurality of interleaving units.

Similarly, in the twelfth to twelfth embodiments, chip deinterleaving can be performed on the spread symbol sequence. In this case, the symbol sequence for performing chip deinterleaving may be subjected to spreading code processing, and by providing a deinterleaving section between the FFT section and the despreading section of the multicarrier communication apparatus according to Embodiments 12 to 14 above. Chip deinterleaving can be performed.

[0358] In Embodiments 12 to 14, the multicarrier communication apparatus can also provide chip deinterleaving for each symbol sequence subjected to spreading processing before multiplexing by providing a plurality of deinterleaving units. .

[0359]

As described above, according to the present invention,
The signal peak voltage can be suppressed with a simple device configuration without deteriorating the transmission characteristics and without increasing the size of the device.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a multicarrier communication apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a diagram showing an OFDM symbol pattern used in the multicarrier communication apparatus according to the embodiment.

FIG. 3 is a diagram showing an OFDM symbol pattern used in the multicarrier communication apparatus according to the embodiment.

FIG. 4 is a diagram showing an OFDM symbol pattern correspondence table used in the multicarrier communication apparatus according to the embodiment.

FIG. 5 is a diagram showing an OFDM symbol pattern used in the multicarrier communication apparatus according to Embodiment 1.

FIG. 6 is a diagram showing an OFDM symbol pattern correspondence table used in the multicarrier communication apparatus according to the first embodiment.

FIG. 7 is a block diagram showing a configuration of a multicarrier communication apparatus according to Embodiment 2 of the present invention.

FIG. 8 is a block diagram showing a configuration of a multicarrier communication apparatus according to Embodiment 3 of the present invention.

FIG. 9 is a block diagram showing a configuration of a multicarrier communication apparatus according to Embodiment 4 of the present invention.

FIG. 10 is a diagram showing a symbol determination operation of the multicarrier communication apparatus according to Embodiment 4 of the present invention.

FIG. 11 is a diagram showing a symbol determination operation of the multicarrier communication apparatus according to Embodiment 4 of the present invention.

FIG. 12 is a diagram showing an example of a correspondence table between a pre-conversion symbol pattern and a post-conversion symbol pattern in the pattern conversion section according to Embodiment 5 of the present invention.

FIG. 13 is a diagram showing an example of a correspondence table between a pre-conversion symbol pattern and a post-conversion symbol pattern in a pattern conversion unit according to Embodiment 6 of the present invention.

FIG. 14 shows a new OFDM according to the seventh embodiment of the present invention.
Diagram showing symbol pattern

FIG. 15 is a diagram showing an example of a correspondence table between a pre-conversion symbol pattern and a post-conversion symbol pattern in the pattern conversion section according to Embodiment 7 of the present invention.

FIG. 16 is a diagram showing an example in which two symbols of amplitude “0” are arranged on eight subcarriers according to Embodiment 8 of the present invention.

FIG. 17 is a diagram showing an example of a correspondence table between a pre-conversion symbol pattern and a post-conversion symbol pattern in the pattern conversion section according to Embodiment 8 of the present invention.

FIG. 18 is a block diagram showing a configuration of a multicarrier communication apparatus according to Embodiment 9 of the present invention.

FIG. 19 is a diagram showing an example of converting binary data to ternary data according to the ninth embodiment of the present invention;

FIG. 20 is a diagram showing signal points of QPSK modulation in the multicarrier communication apparatus according to the embodiment of the present invention.

FIG. 21 is a diagram showing signal points of 16QAM in the multicarrier communication apparatus according to the embodiment of the present invention.

FIG. 22 shows a configuration of a multicarrier communication apparatus according to Embodiment 10 of the present invention.

FIG. 23 is a diagram illustrating an example of signal processing according to the tenth embodiment of the present invention.

FIG. 24 shows a configuration of a multicarrier communication apparatus according to Embodiment 11 of the present invention.

FIG. 25 is a diagram showing a configuration of a multicarrier communication apparatus according to Embodiment 12 of the present invention.

FIG. 26 shows a configuration of a multicarrier communication apparatus according to Embodiment 13 of the present invention.

FIG. 27 is a diagram illustrating an example of signal processing according to Embodiment 13 of the present invention.

FIG. 28 shows a configuration of a multicarrier communication apparatus according to Embodiment 14 of the present invention.

FIG. 29 is a diagram illustrating an example of signal processing according to Embodiment 14 of the present invention.

FIG. 30 is a block diagram showing a configuration of a conventional multicarrier communication device.

[Explanation of symbols]

101, 502 Digital modulation section 102, 503 S / P conversion section 103, 501 Mapping section 104, 504 IFFT section 108, 508 FFT section 109, 201, 301, 401, 511 Demapping section 110, 509 P / S conversion section 111 , 510 Digital demodulation unit 151, 161, 254, 354, 453, 551, 5
61 Pattern conversion unit 152, 162, 252, 352, 454, 552, 5
62 table storage unit 251, 351 pattern matching unit 253 retransmission request unit 353 error correction unit 451 reception level measurement unit 452 signal judgment unit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mitsuru Uesugi 3-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama City, Kanagawa Prefecture Inside Matsushita Communication Industrial Co., Ltd. (72) Inventor Toyoki Ueyoshi Tsunashima Higashishi, Kohoku-ku, Yokohama, Kanagawa Prefecture 3-1, Matsushita Communication Industrial Co., Ltd. (72) Inventor Hiroaki Sudo 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama, Kanagawa Prefecture 4-3-1 Tsunashima Higashi-ku, Matsushita Communication Industrial Co., Ltd. F-term (reference) 5K022 DD01 DD13 DD19 DD23 DD33

Claims (55)

[Claims] 1. A receiving means for receiving a multicarrier signal mapped to a subcarrier in a first symbol sequence including a first symbol having at least one of an in-phase component and a quadrature component having an amplitude of 0, and receiving the multicarrier signal. And a demapping means for demapping to received data. 2. A demapping means for converting a multi-carrier signal mapped to a subcarrier in a first symbol sequence including a first symbol into a second symbol not including the first symbol.
2. The multicarrier communication apparatus according to claim 1, wherein the received data is obtained by demapping the symbol sequence in a predetermined symbol unit and demodulating the demapped symbol pattern. 3. The demapping means demodulates a multicarrier signal mapped to a subcarrier with a first symbol sequence including a first symbol, and converts the demodulated first data represented by three discrete values into two data. 2. The multicarrier communication apparatus according to claim 1, wherein the data is converted into second data represented by discrete values. 4. The demapping means comprises: a storage means for storing a table in which a first symbol string and a second symbol string are associated with each other; and a matching means for checking a received symbol string with the table. The multi-carrier communication device according to claim 2, wherein: 5. The demapping means comprises two discrete values,
4. The multi-carrier communication according to claim 3, further comprising storage means for storing a table in which a second data pattern represented by a value and a first data pattern represented by three discrete values are stored. apparatus. 6. The multicarrier communication apparatus according to claim 4, further comprising retransmission request means for requesting the transmission side to retransmit when the received symbol sequence is not associated with the table. . 7. The apparatus according to claim 4, further comprising error correction means for correcting an error in the symbol sequence when a received symbol sequence is not associated with a table. Multi-carrier communication device. 8. The demapping means includes: an amplitude measuring means for measuring the amplitude of a symbol mapped to each subcarrier; and a pattern determining means for determining the first symbol sequence based on the measured amplitude. The multicarrier communication apparatus according to any one of claims 1 to 7, wherein: 9. A first determining means for determining a subcarrier to which a first symbol is mapped according to the number of subcarriers to which the first symbol whose amplitude is 0 is mapped, in the symbol determination of the received symbol sequence. And a second judging means for judging symbols by polarity judgment for symbols other than those judged as the first symbols in the symbol sequence.
A multicarrier communication apparatus according to any one of claims 1 to 7. 10. The method according to claim 1, wherein the demapping means demaps the plurality of first symbol strings in correspondence with one data pattern in a predetermined symbol unit.
The multi-carrier communication device according to claim 9. 11. A demapping means, comprising: a synthesizing means for synthesizing a plurality of symbols as a synthesized symbol; and a first symbol having the smallest amplitude value among the synthesized symbols.
2. The apparatus according to claim 1, further comprising: first determining means for determining a symbol; and second determining means for performing polarity determination on a symbol other than the first symbol.
0. The multi-carrier communication device according to 0. 12. The multicarrier communication apparatus according to claim 11, wherein the combining means selects and combines a plurality of symbols. 13. The multicarrier communication apparatus according to claim 11, wherein said combining means combines a plurality of symbols with equal gain. 14. The multicarrier communication apparatus according to claim 11, wherein said combining means combines a plurality of symbols at a maximum ratio. 15. A channel estimation unit for performing channel estimation using a known signal, and a replica of a first symbol sequence mapped to a subcarrier in a first symbol sequence including a first symbol by using the result of the channel estimation. Replica signal generating means for generating a signal, received symbol pattern determining means for determining a received symbol pattern by comparing the replica signal with a received symbol pattern, and receiving data from the determined received symbol pattern The multicarrier communication apparatus according to any one of claims 1 to 7, further comprising demodulation means. 16. A system comprising: mapping means for mapping data to be transmitted to subcarriers in a first symbol sequence including a first symbol; and transmitting means for transmitting a mapped multicarrier signal. Multi-carrier communication device. 17. The multicarrier communication according to claim 16, wherein the mapping unit maps the second symbol sequence obtained by modulating the data to be transmitted to the subcarrier using the first symbol sequence including the first symbol. apparatus. 18. The mapping means converts the second data represented by two discrete values to be transmitted into first data represented by three discrete values, and converts the first data including a first symbol to the first data. 17. The multicarrier communication apparatus according to claim 16, wherein modulation is performed into one symbol sequence. 19. The multicarrier communication apparatus according to claim 17, wherein said mapping means includes storage means for storing a table in which a first symbol sequence and a second symbol sequence are associated with each other. 20. A mapping means comprising two discrete values,
19. The multicarrier communication according to claim 18, further comprising storage means for storing a table in which a second data pattern represented by a value and a first data pattern represented by three discrete values are stored. apparatus. 21. The multicarrier communication apparatus according to claim 16, wherein the mapping unit fixes the number of subcarriers on which the first symbol is mapped. 22. The multicarrier communication apparatus according to claim 16, further comprising a notifying unit for notifying the number of subcarriers on which the first symbol is mapped. 23. The first mapping means for mapping.
23. The multicarrier communication apparatus according to claim 16, wherein a Euclidean distance between a first symbol sequence and another first symbol sequence in the symbol sequence is a predetermined distance or more. 24. The first mapping means for mapping.
24. The multi-carrier transmission method according to claim 16, wherein, in the symbol sequence, a first symbol sequence group is different from another first symbol sequence group in a position of a subcarrier to which a first symbol is mapped. Carrier communication device. 25. The mapping means associates one data pattern with a plurality of first symbol strings, and the transmission means:
25. The multicarrier communication apparatus according to claim 16, wherein one of the plurality of first symbol sequences is transmitted. 26. The first mapping means for mapping.
In the symbol sequence, a Euclidean distance between a first symbol sequence corresponding to one data to be transmitted and another first symbol sequence corresponding to the data to be transmitted is equal to or less than a Euclidean distance to another first symbol sequence. 26. The multi-carrier communication device according to claim 25, wherein: 27. The mapping means according to claim 16, wherein the mapping means arranges the first symbol on a subcarrier different from a subcarrier on which the first symbol has been arranged in the past in the first symbol sequence to be transmitted. A multi-carrier communication device according to claim 1. 28. The mapping device according to claim 27, wherein the mapping device includes an insertion position storage device for storing a position and a timing of the first symbol in the first symbol sequence.
A multi-carrier communication device according to claim 1. 29. The mapping device according to claim 2, wherein the mapping means includes random number generating means for determining a position and a timing of the first symbol in the first symbol sequence by using a random number.
8. The multi-carrier communication device according to 7. 30. The method according to claim 16, wherein the mapping means maps a data pattern to a first symbol sequence by using a plurality of first symbols as one set for one first symbol. Multi-carrier communication device. 31. The multicarrier communication apparatus according to claim 16, further comprising first spreading means for spreading a symbol sequence at a predetermined spreading factor. 32. The apparatus according to claim 31, wherein the first spreading means spreads a first symbol sequence including the first symbol mapped by the mapping means at a predetermined spreading factor.
A multi-carrier communication device according to claim 1. 33. A first spreading unit multiplies a second symbol sequence obtained by modulating data to be transmitted by a spreading code, and a mapping unit converts the second symbol sequence into a first symbol sequence including a first symbol. The multi-carrier communication apparatus according to claim 31, wherein mapping is performed on a carrier. 34. The apparatus according to claim 32, further comprising serial-parallel conversion means for performing serial-parallel conversion on a first symbol sequence including the first symbols spread by the first spreading means at a predetermined spreading factor. Multi-carrier communication device. 35. A serial-parallel conversion means for performing serial-parallel conversion on a symbol sequence, wherein the first spreading means spreads the serial-parallel-converted symbol sequence at a predetermined spreading factor. 32. The multi-carrier communication device according to 31. 36. The multicarrier communication apparatus according to claim 35, wherein the serial / parallel conversion unit performs serial / parallel conversion on a first symbol sequence including the first symbol mapped by the mapping unit. 37. The multicarrier communication apparatus according to claim 35, wherein the mapping means maps the symbol sequence spread by the first spreading means. 38. Second spreading means for spreading a first symbol sequence including the first symbol mapped by the mapping means at a predetermined spreading factor, wherein the serial / parallel conversion means uses the second spreading means to spread the spread code. 36. The multicarrier communication apparatus according to claim 35, wherein serial-parallel conversion is performed on the first symbol sequence multiplied by. 39. A second spreading means for spreading a second symbol sequence at a predetermined spreading factor, wherein the serial / parallel converting means is configured to multiply the second spreading means by the spreading code.
36. The multicarrier communication apparatus according to claim 35, wherein serial-parallel conversion is performed on the symbol sequence, and the mapping unit performs a mapping process on the signal spread by the first spreading unit. 40. The multi-carrier communication apparatus according to claim 38, further comprising a two-dimensional interleaving means for rearranging the spread signal on a chip basis in a subcarrier order and a transmission time order. 41. The apparatus according to claim 31, further comprising third spreading means for spreading the signal spread by the first spreading means using a different spreading code for each communication device at a predetermined spreading factor. 38. The multi-carrier communication device according to any one of 38. 42. The multicarrier communication apparatus according to claim 41, further comprising interleaving means for rearranging the signals spread by the third spreading means on a chip-by-chip basis. 43. The multicarrier communication apparatus according to claim 31, further comprising interleaving means for rearranging the signals spread by the first spreading means on a chip-by-chip basis. 44. The apparatus according to claim 43, further comprising third spreading means for spreading the signals rearranged in units of chips by the interleaving means at a predetermined spreading factor using a spreading code different for each communication apparatus. A multi-carrier communication device as described. 45. The communication device according to any one of claims 31 to 44, wherein the communication device communicates with the communication device according to any one of claims 31 to 44.
The multi-carrier communication device according to any one of the above. 46. A communication terminal device comprising the multicarrier communication device according to claim 1. Description: 47. A base station apparatus comprising the multicarrier communication apparatus according to claim 1. Description: 48. The transmitting device comprises: a mapping step of mapping data to be transmitted to subcarriers in a first symbol sequence including a first symbol; and a transmitting step of transmitting a mapped multicarrier signal. Receiving a multicarrier signal mapped to a subcarrier in a first symbol sequence including the first symbol on the receiving device side; and demapping the multicarrier signal to received data. A peak power suppression method comprising: 49. The peak power suppression according to claim 48, wherein the mapping step maps the second symbol sequence obtained by modulating the data to be transmitted to the subcarrier using the first symbol sequence including the first symbol. Method. 50. The mapping step converts the second data represented by the two discrete values to be transmitted into the first data represented by the three discrete values, and converts the first data including the first symbol into the first data. 49. The peak power suppressing method according to claim 48, wherein modulation is performed into one symbol sequence. 51. The demapping step demaps a multicarrier signal mapped to a subcarrier with a first symbol sequence including a first symbol to a second symbol sequence not including the first symbol in a predetermined symbol unit. And
The demodulated symbol pattern is demodulated to obtain received data.
The peak power suppression method according to any one of the above. 52. A demapping step demodulates a multicarrier signal mapped to a subcarrier with a first symbol sequence including a first symbol, and converts the demodulated first data represented by three discrete values into two data. The peak power suppressing method according to any one of claims 48 to 50, wherein the method converts the data into second data represented by discrete values. 53. A demapping step, comprising: an amplitude measuring step of measuring an amplitude of a symbol mapped to each subcarrier; and a pattern determining step of determining the first symbol sequence based on the measured amplitude. 53. The peak power suppression method according to any one of claims 48 to 52, wherein: 54. The transmitting device includes a notification step of notifying the number of subcarriers on which the first symbol having the amplitude of 0 is mapped, and the receiving apparatus has a first mapping method in which the amplitude is set to 0 in the demapping step. A first determining step of determining a subcarrier on which the first symbol is mapped according to the number of subcarriers on which the symbol is mapped;
53. The peak power suppression method according to claim 48, further comprising: a second determination step of performing polarity determination on a symbol other than a symbol. 55. A transmitting device, comprising: a transmitting process of transmitting a known signal; a receiving device receiving the known signal; and a channel estimating process of performing channel estimation using the received signal. A replica signal generating step of generating a replica signal of a first symbol sequence including a first symbol using a result of the channel estimation, and determining a received symbol pattern by comparing the replica signal with a received symbol pattern. 53. The peak power suppression method according to claim 48, further comprising: a receiving symbol pattern determining step of performing a receiving symbol pattern determining step; and a demodulating step of obtaining received data from the determined receiving symbol pattern.