WO2004034620A1 - マルチキャリア送信装置及びマルチキャリア送信方法 - Google Patents
マルチキャリア送信装置及びマルチキャリア送信方法 Download PDFInfo
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- WO2004034620A1 WO2004034620A1 PCT/JP2003/012564 JP0312564W WO2004034620A1 WO 2004034620 A1 WO2004034620 A1 WO 2004034620A1 JP 0312564 W JP0312564 W JP 0312564W WO 2004034620 A1 WO2004034620 A1 WO 2004034620A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0059—Convolutional codes
- H04L1/006—Trellis-coded modulation
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/37—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/63—Joint error correction and other techniques
- H03M13/6325—Error control coding in combination with demodulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0064—Concatenated codes
- H04L1/0066—Parallel concatenated codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/29—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes
- H03M13/2957—Turbo codes and decoding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L2001/0098—Unequal error protection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0016—Time-frequency-code
- H04L5/0021—Time-frequency-code in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0037—Inter-user or inter-terminal allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0042—Arrangements for allocating sub-channels of the transmission path intra-user or intra-terminal allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
- H04L5/0046—Determination of how many bits are transmitted on different sub-channels
Definitions
- the present invention relates to a multi-carrier transmission device and a multi-carrier transmission method.
- Yuichibo code which has been adopted as a standard at 3GPP.
- the feature of this evening code is that it has very good error rate characteristics compared to other error correction methods.
- OFDM is an effective communication method for the fourth generation, and is regarded as a promising fourth-generation communication method.
- OFDM cannot perform communication at all if there is an interference wave, and can perform communication even when there is an interference wave from other cells by reducing interference from other cells by despreading processing.
- FDM-CDMA communication system combining CDMA and OFDM is known.
- the error rate characteristic can be improved by using the combination of the evening-both coding and the 0FDM communication system or the combination of the evening-both coding and the OFDM-CDMA communication system.
- the error rate performance is improved to some extent by combining the evening-both coding with the 0 FDM communication system or the evening-both coding with the 0 FDM-CDMA communication system.
- transmission signals of different channels interfere with each other, so that there is a problem that the improvement of the error rate performance is limited.
- An object of the present invention is to significantly improve the error rate characteristics of transmission data for which good quality is required. It is an object of the present invention to provide a multi-carrier transmission apparatus and a multi-carrier transmission method capable of improving the quality and preventing a decrease in the quality of transmission data requiring good quality.
- FIG. 1 is a block diagram showing a configuration of a multi-carrier transmitting apparatus according to Embodiment 1 of the present invention.
- FIG. 2 is a block diagram showing a configuration of an encoding unit according to Embodiment 1 of the present invention.
- FIG. 3 is a diagram showing an arrangement of data for each subcarrier.
- FIG. 4 is a block diagram showing a configuration of a multi-carrier transmitting apparatus according to Embodiment 2 of the present invention.
- FIG. 5 is a schematic diagram showing the arrangement of data for each subcarrier.
- FIG. 6 is a diagram showing an arrangement of data for each subcarrier
- FIG. 7 is a block diagram showing a configuration of a multi-carrier transmitting apparatus according to Embodiment 3 of the present invention.
- FIG. 8 is a diagram showing a configuration of a control unit according to Embodiment 3 of the present invention.
- FIG. 9 is a block diagram showing a configuration of a multi-carrier transmitting apparatus according to Embodiment 4 of the present invention.
- FIG. 10 is a block diagram showing a configuration of a multicarrier transmission apparatus according to Embodiment 5 of the present invention.
- FIG. 11 is a block diagram showing a configuration of a multicarrier transmission apparatus according to Embodiment 6 of the present invention.
- FIG. 12 is a diagram showing an arrangement of data in each subcarrier
- FIG. 13 is a block diagram showing a configuration of a multicarrier transmission apparatus according to Embodiment 8 of the present invention
- FIG. 14 is a diagram illustrating a signal spectrum for one subcarrier
- FIG. 15 is a diagram illustrating a signal spectrum
- FIG. 16 is a schematic diagram showing the arrangement of data for each subcarrier
- FIG. 17 is a block diagram showing a configuration of a multi-carrier transmitting apparatus according to Embodiment 9 of the present invention.
- FIG. 18 is a block diagram illustrating a configuration of a delay spread information generation unit according to Embodiment 9 of the present invention.
- FIG. 19 is a block diagram showing a configuration of a multi-carrier transmitting apparatus according to Embodiment 10 of the present invention.
- FIG. 20 is a block diagram showing a configuration of a multi-carrier transmitting apparatus according to Embodiment 11 of the present invention.
- FIG. 21 is a schematic diagram showing an arrangement of data for each subcarrier.
- FIG. 1 is a diagram illustrating a configuration of a multi-carrier transmission apparatus 100 according to the present embodiment
- FIG. 2 is a diagram illustrating a configuration of an encoding unit 101
- FIG. It is a figure which shows arrangement
- the multi-carrier transmitting apparatus 100 includes an encoding unit 101, a modulation unit 102, a subcarrier arrangement unit 103, an OFDM unit 104, an amplifier 105, an antenna 106, and an F 106.
- the encoding unit 101 serving as a dividing unit is, for example, an evening encoder, and outputs a part of the input transmission data to the modulation unit 102 as a systematic bit data without encoding it. Then, the remaining part of the input transmission data is subjected to recursive convolutional coding, and is output to the modulation unit 102 as a parity bit data.
- the details of the encoding unit 101 will be described later.
- the modulation unit 102 performs modulation processing on the systematic bit data, which is high-quality transmission data input from the encoding unit 101, and the parity bit data, which is normal transmission data, respectively.
- each of the modulated systematic bit data and the parity bit data is output to subcarrier arranging section 1 13.
- the modulation scheme used in the modulation section 102 is adaptively changed according to the channel quality, and 16 QAM or QPSK is used. Then, both the systematic bit data and the parity bit data are modulated by the same modulation scheme.
- the modulation method is not limited to 16 QAM or QPSK, and a modulation method other than 16 QAM and QPSK may be used.
- the subcarrier arranging unit 103 which is a reordering unit, is arranged such that, in the frequency domain of the subcarrier on which the transmission data is allocated, the systematic bit data input from the modulation unit 102 is a subcarrier near the center frequency.
- the systematic bit data and the parity bit data are rearranged so that the parity bit data is allocated to subcarriers near both ends.
- the region on the frequency axis of the subcarrier in which the systematic bit data and the parity bit data are arranged is changed according to the reception level of the adjacent channel interference wave input to the subcarrier arrangement unit 103.
- subcarrier arranging section 103 outputs transmission data including the rearranged systematic bit data and parity bit data to OFDM section 104.
- the OFDM unit 104 which is orthogonal frequency division multiplexing means, performs orthogonal high-speed Fourier transform (IFFT) processing on transmission data input from the subcarrier arranging unit 103, and then performs orthogonal frequency conversion. Divide and multiplex to generate OFDM signal
- the generated OFDM signal is transmitted from the antenna 106 via the amplifier 105.
- the method of arranging the transmission data for each subcarrier will be described later.
- Amplifier 105 transmits the transmission data input from OFDM section 104 at a predetermined transmission power controlled by transmission power control section 109 from antenna 106. At this time, the transmission power of the systematic bit data allocated to the subcarrier near the center frequency is transmitted at a transmission power higher than the transmission power of the parity bit data allocated to the subcarriers near both ends.
- the FTT section 107 performs fast Fourier transform (FTT) processing on the received data received by the antenna 106 and outputs the result to the demodulation section 108.
- FTT fast Fourier transform
- the demodulation unit 108 demodulates the received data input from the FFT unit 107, and
- the demodulated received data is output to the transmission power control unit 109.
- the transmission power control unit 109 serving as transmission power setting means determines transmission power from the received data input from the demodulation unit 108 and transmits the transmission data at the determined transmission power to the amplifier 1. Transmission power control is performed on 05.
- the transmission power control unit 109 sets the transmission power of the systematic bits arranged in the subcarriers near the center frequency to be smaller than the transmission power of the parity bits arranged in the subcarriers at both ends of the frequency. Transmission power control is performed so as to increase the transmission power. As a result, the transmission power can be changed according to the line quality. Therefore, the transmission data is transmitted at transmission power according to the line quality.
- the coding section 101 is mainly composed of an interleaver 201, a convolution coding section 202 and a convolution coding section 203.
- the data receiver 201 outputs the data to the convolutional encoder 203, which is a process for rearranging the transmission data.
- the convolutional encoder 202 recursively encodes a part of the transmission data and outputs the result to the modulator 102.
- the output from the convolutional encoder 202 is parity bit data.
- Convolutional coding section 203 recursively codes a part of the transmission data input from interleaver 201 and outputs the result to modulating section 102.
- the output from the convolutional encoder 203 is parity bit data. Note that a part of the transmission data input to the encoding unit 101 is output as it is without encoding. This output is the systematic bit data.
- L1 in FIG. 3 is a frequency domain of a subcarrier in which a transmission data consisting of a systematic bit data and a parity bit data is arranged.
- the subcarriers 301 and 302 are subcarriers at the ends.
- Subcarrier 304 to subcarrier 305 are subcarriers near the center frequency.
- the subcarriers 301 to 306 and the subcarriers 302 to 307 are subcarriers near the end.
- the parity bit data is arranged in the subcarriers of the frequency domains W1 and W3, and the sub data of the frequency domain W2.
- a systematic bite is placed on the carrier.
- the frequency domain W2 of the subcarrier in which the systematic bit data is arranged is changed according to the reception level of the adjacent channel interference wave. That is, when the reception level of the adjacent channel interference wave is high, the range of the frequency region W2 where the systematic bit data is arranged is narrowed, and when the reception level of the adjacent channel interference wave is low, In this case, the range of the frequency domain W2 in which the systematic bit data is arranged is increased.
- the transmission data is other than the systematic bit data and the parity bit data
- the transmission data may be the same as the transmission data such as control information or retransmission information requiring good quality and the normal quality.
- the present embodiment can be applied to a case where control information and transmission data other than retransmission information are arranged in each subcarrier.
- the encoding unit 101 does not necessarily need to be an evening coder, and an encoder other than the evening coder can be applied.
- the control information is information used for communication control
- the retransmission information is used when receiving data again when the receiving side cannot demodulate correctly due to an error in the data.
- Information. Coding section 101 divides into transmission data requiring good quality and transmission data having good quality and outputs the result to subcarrier locating section 103.
- transmission data requiring good quality is placed in the subcarriers near the center frequency F1
- good quality transmission data in normal quality is placed in the subcarriers near both ends.
- the transmission data is rearranged so as to be performed.
- transmission data requiring good quality is arranged in the subcarrier in the frequency domain W2 near the center frequency F1, and the transmission data near both ends is arranged.
- good transmission data with normal quality is arranged in the frequency domain W1 and W3 subcarriers.
- the multicarrier transmission apparatus and the multicarrier transmission method of the present embodiment systematic bit data is allocated to subcarriers near the center frequency, and parity bit data is allocated to subcarriers near both ends. Since the transmission time is arranged, it is possible to improve the error rate characteristics of transmission data that requires good quality, and to improve the communication quality of transmission data that requires good quality.
- the subcarrier near the center frequency has good quality of control information or retransmission information. Is placed in the subcarriers near both ends, and transmission data with normal quality other than control information and retransmission information is placed in the subcarriers near both ends.
- the transmission power control is performed so that the transmission power of the systematic bit data arranged in the subcarrier near the center frequency is larger than the transmission power of the parity bit data arranged in the subcarriers on both ends of the frequency. Therefore, the error rate characteristic of the systematic bit rate can be improved.
- transmission power control according to the channel quality is performed using the demodulation result.
- the present invention is not limited to this, and transmission power is variably set regardless of the demodulation result. May be.
- the transmission power of both the systematic bit data and the parity bit data is made variable.
- the present invention is not limited to this, and the transmission power of the systematic bit data or parity bit data is not limited to this. Only one of the transmission powers may be variable.
- the transmission power of the systematic bit data is set higher than the transmission power of the parity bit data.
- the present invention is not limited to this. Even if the transmission power of the systematic bit data is the same as the transmission power of the parity bit data.
- the transmission power of the parity bit data may be made larger than the transmission power of the systematic bit data.
- the transmission data is not limited to the systematic bit data and the parity bit data, but may be data other than the systematic bit data and the parity bit data, and the required quality is different. May be.
- an encoder other than the one-time encoder can be applied to the encoding unit 101.
- FIG. 4 is a diagram showing a configuration of a multicarrier transmitting apparatus 400 according to Embodiment 2 of the present invention
- FIGS. 5 and 6 are diagrams showing an arrangement of data for each subcarrier.
- a communication method that combines a CDMA and a multicarrier is used as a communication method.
- One of the most promising communication systems in the fourth generation is the 0 FDM-CDMA communication system that combines CDMA and OFDM.
- the OFDM-CDMA communication system can reduce interference from other cells by despreading processing. Therefore, communication is possible even when interference from other cells exists. However, communication becomes completely impossible in the presence of interference waves.
- the present embodiment differs from FIG. 1 in the configuration in which a spreading section 401 and a despreading section 402 are provided in FIG. 4, and the other configuration is the same as that in FIG. The description is omitted.
- Spreading section 401 spreads the transmission data input from subcarrier arranging section 103 so that the spreading ratio becomes 1/5 of the number of subcarriers, and outputs the result to OFDM section 104.
- the FDM unit 104 performs an inverse high-speed Fourier transform process and a parallel-serial conversion process on the spread data transmitted from the spreading unit 401 and then performs an inverse high-speed Fourier transform process and a parallel-serial conversion process.
- the OFDM signal is generated by orthogonal frequency division multiplexing by distributing and allocating the OFDM signal to a plurality of subcarriers located in a subcarrier, and the generated ⁇ FDM signal is transmitted from the antenna 106 via the amplifier 105.
- Despreading section 402 performs despreading processing on the received data input from demodulation section 108 to obtain received data, and outputs the despread received data to transmission power control section 10'9. I do.
- Transmission power control section 109 determines transmission power from the received data input from despreading section 402 and performs transmission power control on amplifier 105 so as to transmit transmission data at the determined transmission power.
- the transmission power control unit 109 calculates the transmission power of the systematic bit data arranged in the subcarrier near the center frequency from the transmission power of the parity bit data arranged in the subcarriers on both frequency sides. The transmission power control is performed so that
- the spreading factor When performing spreading and multiplexing, the spreading factor, the number of code The same is applied to the subcarrier or all users.
- the number of spreading codes is the number of spreading codes assigned to one user.
- the number of code multiplexes is the number of multiplexes for each carrier, and is determined by the number of users (how many codes) to multiplex.
- FIG. 5 is a diagram showing a state where code division multiplexed signals divided into five groups are arranged in each subcarrier
- FIG. 6 is a diagram showing the arrangement of each subcarrier grouped as in FIG. 5 as in FIG.
- FIG. 6 is a diagram shown by the method of FIG.
- Group 1 is composed of subcarriers #l to #m
- Group 2 is composed of subcarriers # m + l to # 2m
- Group 3 is subcarrier # 2 m + 1 to Group 4
- group 5 is composed of subcarriers # 4m + 1 to # m5.
- Frequency domain W10 contains subcarriers of group 1
- frequency domain W11 1 contains subcarriers of groups 2, 3, and 4
- frequency domain W12 contains subcarriers of group 5. .
- the effects of adjacent channel interference waves are the largest in subcarriers in groups 1 and 5, the next largest in subcarriers in groups 2 and 4, and the least in subcarriers in group 3. Therefore, parity bit data that can be of normal quality is allocated to the subcarriers of groups 1 and 5, and the systematic bit that requires good quality is allocated to the subcarriers of groups 2, 3, and 4. One night is arranged.
- the diffusion unit 401 can select an arbitrary diffusion ratio. Further, the spreading unit 401 sets the spreading ratio between the systematic bit data and the parity bit data. It is possible to independently select and spread the systematic bit data and parity bit data independently at the selected spreading ratio. When the spreading ratio is increased, the gap length of the spreading chip for one symbol becomes longer, so that the accuracy of the despreading can be increased, and the transmission data can be accurately recovered on the receiving side.
- the spreading ratios of the systematic bit data arranged in groups 2, 3, and 4 that are subcarriers near the center frequency can be calculated by using the subcarriers on both ends of the frequency band, groups 1 and 5. It is made larger than the spreading ratio of the parity bit data located in.
- the spreading ratio of the systematic bit data is not limited to the case where the spreading ratio of the parity bit data is larger than the spreading ratio of the parity bit data.
- the spreading ratio of the parity bit data may be made larger than the spreading ratio of the systematic bit data.
- the OFDM section 104 can select an arbitrary number of code multiplexes. Further, the OFDM unit 104 independently selects the number of code multiplexes of the systematic bit data and the parity bit data, and separates the systematic bit data and the parity bit data with the selected number of code multiplexes. Code multiplexing can be performed independently. Subcarriers with a reduced number of code multiplexes have lower transmission power than other subcarriers. For this reason, it is possible to further increase the transmission power, and to further improve the error rate characteristics when there is adjacent channel interference waves or degradation of analog aperture.
- the number of code multiplexes of the systematic bit data allocated to groups 2, 3, and 4 that are subcarriers near the center frequency is changed to groups 1 and 2 that are subcarriers on both frequency sides. It should be less than the code multiplexing number of the parity bit data allocated in 5.
- the number of code multiplexes in the systematic bit data is not limited to be smaller than the number of code multiplexes in the parity bit data. May be smaller than the number of code multiplexes.
- Spreading section 401 can select an arbitrary number of spreading codes. Also, the spreading section 401 selects the number of spreading codes to be allocated independently from the systematic bit data and the parity bit data, and the systematic bit data is selected using the selected spreading code number. It is possible to perform the diffusion processing on the bit stream and the parity bit data independently. In a multipath environment, the orthogonality between spreading codes is destroyed by a delayed wave, but there are two types of codes, one with large orthogonality degradation and one with small orthogonality! Therefore, the diversity effect can be obtained by multi-code transmission, and the error rate characteristics can be further improved. Therefore, according to FIGS.
- the number of code multiplexes of the systematic bits arranged in groups 2, 3, and 4, which are subcarriers near the center frequency, is a subcarrier on both frequency sides.
- the number is larger than the number of code multiplexes of the parity bit data arranged in groups 1 and 5.
- the number of spreading codes assigned to the systematic bit data is not limited to the case where the number of spreading codes assigned to the parity bit data is larger than the number of spreading codes assigned to the parity bit data. It may be larger than the number of spreading codes assigned.
- the frequency domain W11 of the subcarriers in which the systematic bits are arranged is changed according to the reception level of the adjacent channel interference wave. That is, when the reception level of the adjacent channel interference wave is high, the range of the frequency region W11 where the systematic bit data is arranged is narrowed, and when the reception level of the adjacent channel interference wave is low, the systematic The range of the frequency region W11 where the peak bit data is arranged is widened.
- the subcarriers assigned to groups 1 to 5 also change according to the change in frequency domain Wl1.
- transmission data is spread.
- Processing and orthogonal frequency division multiplexing OFDM-CDMA communication method is used, so that error rate characteristics can be improved even if there is interference from other cells without lowering the frequency use efficiency. Can be.
- the spreading ratio of the systematic bit data is set to be larger than that of the parity bit data, the receiving side can accurately restore the systematic bit data, which is preferable. It is possible to improve the error rate characteristics of a systematic bite that requires high quality.
- the transmission power of the systematic bit data can be increased, so good quality is required. It is possible to improve the error rate characteristics of the systematic bit data obtained.
- the number of code multiplexes in the systematic bit data is set to be larger than the number of code multiplexes in the parity bit data, the error rate of the systematic bit data requiring good quality is required due to the diversity effect in the systematic bit data. Characteristics can be improved.
- the subcarriers are divided into five groups. However, it is not always necessary to divide the subcarriers into five groups, and the number of groups other than the five groups may be used.
- the transmission data is not limited to the systematic bit data and the parity bit data, but may be data having different required qualities other than the systematic bit data and the parity bit data.
- an encoder other than the turbo encoder can be applied to the encoding unit 101.
- FIG. 7 is a diagram illustrating a configuration of multicarrier transmitting apparatus 700 according to Embodiment 3 of the present invention
- FIG. 8 is a diagram illustrating a configuration of control section 720.
- the present embodiment is characterized in that a turbo code is used as an error correction code and adaptive modulation is performed independently on systematic bit data and parity bit data.
- FIG. 1 is different from that of FIG. 1 in that the control unit is provided with the control unit 7102 and the other configuration is the same as that of FIG. Is omitted.
- the control unit 7 ⁇ 2 outputs a control signal to the modulation unit 701a and the modulation unit 701b to make the modulation scheme set based on the RSI (Received Signal Strength Indicator) signal level.
- the control unit 720 sets a threshold value for setting the modulation method for modulating the systematic bit data and a modulation method for modulating the parity bit data. Threshold 5 and two thresholds are used.
- the RSSI signal level is equal to or higher than the threshold value, it is estimated that the line quality is good, and a control signal for setting the modulation system of the systematic bit data to the 16 Q AM modulation system is modulated by the modulation unit 71 a Output to If the RSSI signal level is equal to or higher than the threshold value / ?, it is estimated that the line quality is good, and the control signal for setting the modulation scheme for parity bit data to 16 QAM modulation scheme is applied to the modulation section 7. Output to 0 1 b.
- control section 702 estimates that the line quality is degraded, and sets the modulation method for systematic bit data transmission to QPSK modulation method.
- the control signal is output to the modulation section 70a. If the RSSI signal level is less than the threshold value / ?, it is estimated that the line quality is degraded, and the control signal for setting the modulation method of the parity bit data to the QPSK modulation method is 70 lb. Output to Note that if communication is currently in progress and the result of the determination by the control unit 702 continues to use the currently used modulation scheme, the control unit 702 transmits the control signal to the modulation unit 700 Not output to a and modulation section 70 1 b. The configuration of the control unit 702 will be described later in detail.
- the modulation unit 700a performs QPSK modulation or 16QAM modulation on the systematic bit data input from the encoding unit 101 based on the control signal input from the control unit 720. Are output to the subcarrier arrangement section 103.
- the modulation section 700b performs coding based on the control signal input from the control section 702.
- the parity bit data input from section 101 is subjected to adaptive modulation of QPSK modulation or 16 QAM modulation and output to subcarrier arrangement section 103.
- the control unit 702 mainly includes a first determination control unit 801 and a second determination control unit 802.
- first determination unit # 1 801 If the RSSI signal level is equal to or higher than a predetermined threshold value, first determination unit # 1 801 outputs a control signal for setting the modulation method to 16 QAM to modulation unit 70 la. On the other hand, if the RSSI signal level is less than threshold value ⁇ : (not shown), a control signal for setting the modulation method to QPSK is output to modulation section 701a.
- second determination control section 802 If the R SSI signal level is equal to or higher than a preset threshold value / ?, second determination control section 802 outputs a control signal for setting the modulation method to 16 QAM to modulation section 70 lb. On the other hand, if the RSSI signal level is less than the threshold value /? (Not shown), a control signal for setting the modulation method to QPSK is output to modulation section 701b.
- the threshold ⁇ is higher than the threshold 5: set to the SSI signal level.
- the systematic bit data and parity bit data that are independently adaptively modulated are subjected to orthogonal frequency division multiplexing in the FDM section 104.
- the parity bit data is arranged, and the systematic bit data is arranged in the subcarrier near the center frequency F1.
- systematic bit parity and parity bit parity are adapted according to communication quality. Because of the modulation, systematic bit data that requires good quality is By modulating the parity bit data with a modulation method with a large number of multi-levels, the error rate of the parity bit data is increased even if the parity bit data is arranged on subcarriers near both ends. Deterioration of characteristics can be reduced. Further, since systematic bit data and parity bit data are adaptively modulated according to communication quality, it is possible to achieve both an improvement in error rate characteristics and an improvement in transmission efficiency. Further, in the control unit 722, since the systematic bit data and the parity bit data are compared with different threshold values and different threshold values 5, the error rate characteristics can be improved flexibly in response to changes in communication quality. It is possible to improve the transmission efficiency.
- both the systematic bit data and the parity bit data are adaptively modulated.
- the present invention is not limited to this, and either one of the systematic bit data and the parity bit data is modulated. May be used as a fixed modulation method, and only one of them may be adaptively modulated.
- the RSSI signal level is compared with the threshold value and the threshold value /? In the control unit 72, but the present invention is not limited to this, and indicates the line quality other than the RSSI signal. The signal and the like may be compared with the threshold value and the threshold value /.
- the threshold ⁇ and the threshold 3 are set to different values, but the present invention is not limited to this, and the threshold one threshold /?
- the threshold value may be smaller than the threshold value?.
- adaptive modulation may be performed by a modulation method such as BPSK other than 16 QAM and QPSK.
- the systematic bit data is modulated by the modulating section 71a and the parity bit data is modulated by the modulating section 71b, the present invention is not limited to this.
- the parity bit may be adaptively modulated independently.
- the transmission data is not limited to the system bit data and the parity bit data, but may be data data having different required quality other than the system bit data and the parity bit data.
- the coding unit 101 is a code other than the one-button encoder. No. is applicable.
- FIG. 9 is a diagram showing a configuration of a multi-carrier transmitting apparatus 900 according to Embodiment 4 of the present invention.
- the present embodiment uses a one-bit code as an error correction code, and adaptively modulates the systematic bit data and the parity bit data independently of each other.
- the feature is that the modulation method is set by comparing the reception level of the channel interference wave with the threshold value / ?.
- FIG. 9 shows a configuration in which modulation section 701 is composed of modulation section 701 a and modulation section 701 b, and control sections 901 and 902 are provided. 1 and the other configuration is the same as that of FIG. 1, and therefore, the same reference numerals are given and the description thereof is omitted.
- the configuration and operation of the modulators 701a and 701b are the same as those in Embodiment 3 described above, and thus description thereof is omitted.
- the control section 901 outputs a control signal to the modulation section 701 a to make the modulation scheme set based on the R SSI signal level. That is, if the R SSI signal level is equal to or higher than the threshold value, a control signal for setting the modulation system of the systematic bit decoding to the 16 QAM modulation system is output to the modulation unit 71a.
- control section 901 outputs a control signal for setting the modulation scheme of the systematic bit data to the QPSK modulation scheme to modulation section 701a.
- the control unit 92 outputs a control signal to the modulation unit 70 lb to be a modulation method set based on the adjacent channel interference wave reception level. That is, if the adjacent channel interference wave reception level is equal to or higher than the threshold value / ?, a control signal for setting the modulation scheme for parity bit decoding to the QPSK modulation scheme is output to modulator 70 lb.
- the method for measuring the reception level of the adjacent channel interference wave is a method of detecting the level difference before and after the filter for adjacent channel removal (not shown) of the radio section or the frequency of the P adjacent channel during a time period when neither transmission nor reception is performed. To switch the level and measure the level Etc.
- the control unit 902 modulates the control signal for setting the modulation method of the parity bit data to the 16 Q AM modulation method. Output to 7 0 1 b.
- the parity bit data is determined in accordance with the adjacent channel interference wave reception level.
- the parity bit data can be modulated using a modulation method with a small number of modulation levels, so that the parity bit data is arranged in subcarriers near both ends. Also, it is possible to reduce the deterioration of the error rate characteristics of the parity bit data.
- both the systematic bit data and the parity bit data are adaptively modulated.
- the present invention is not limited to this, and either one of the systematic bit data and the parity bit data is modulated. May be used as a fixed modulation method, and only one of them may be adaptively modulated.
- the control unit 901 compares: the RSSI signal level and the threshold value, but the present invention is not limited to this. Signals indicating line quality other than the RSSI signal and the threshold value are compared. May be compared. For example, the reception level of the adjacent channel interference wave may be compared with a threshold value. Further, adaptive modulation may be performed by a modulation method other than 16 QAM and QPSK.
- the systematic bit data is modulated by the modulating section 71a and the parity bit data is modulated by the modulating section 71b.
- the present invention is not limited to this. It is also possible to adaptively modulate the seek bit and the parity bit independently.
- the transmission data is not limited to the systematic bit data and parity bit data, but may be data having different required quality other than systematic bit data and parity bit data.
- an encoder other than the Yuichibo encoder can be applied to the encoding unit 101. (Embodiment 5)
- FIG. 10 is a diagram showing a configuration of the multi-carrier transmitting apparatus 1000 according to Embodiment 5 of the present invention.
- a user relatively far from the base station is strongly affected by adjacent channel interference waves from many cells, and thus the channel quality is greatly degraded.
- the present embodiment is characterized in that the data of a user relatively far from the base station is allocated to subcarriers near the center frequency.
- the present embodiment is different from FIG. 1 in the configuration in which a serial / parallel (hereinafter, referred to as “SZP”) conversion unit 1001 is provided in FIG. 10, and other configurations are the same as those in FIG. The description is omitted.
- SZP serial / parallel
- the S / P converter 100 based on user information input from a user information storage unit (not shown), performs transmission data transmission to a nearby user and transmission data transmission to a distant user. And outputs each transmission data to the subcarrier locating section 103.
- the subcarrier arranging section 103 arranges the transmission data to be transmitted to a nearby user in the subcarrier of the frequency domain W1 in FIG. 3, and the transmission data to be transmitted to a distant user is in the frequency domain W2.
- the transmission data is rearranged such that the transmission data is arranged in the subcarrier, and the transmission data is rearranged and output to the FDM section 104.
- the transmission data to be transmitted to the user far away from the sub-carrier near the center frequency is arranged, and the sub-carrier near the both ends is near. Since the transmission data to be transmitted to the user is arranged, the line quality of the transmission data of a user relatively far from the base station can be improved without lowering the transmission efficiency.
- the transmission power of the transmission data transmitted to a distant user located in the subcarrier near the center frequency is transmitted to the nearby user disposed in the subcarriers on both frequency sides. Since the transmission power is controlled so that it is larger than the transmission power, the error rate characteristics of transmission data transmitted to distant users are improved. Can be done.
- the present embodiment can be applied to both the case where error correction is performed using the evening-both encoder and the case where error correction is performed using an encoder other than the evening-both encoder.
- error correction is performed using a one-time encoder
- systematic bit data is further allocated to subcarriers near the center frequency among subcarriers in which transmission data of users relatively far from the base station are arranged. May be arranged.
- the transmission data output from SZP conversion section 1001 is
- the evening was divided into two parts, the transmission data of the user near the base station and the transmission data of the user relatively far from the base station, but this was not the only option.
- the data may be divided into three or more pieces of transmission data and output.
- FIG. 11 is a diagram showing a configuration of a multi-carrier transmitting apparatus 110 according to Embodiment 6 of the present invention.
- rearrangement for arranging the systematic bit data and the parity bit data on each carrier is performed. It is characterized in that it is performed.
- the interleaving is performed collectively for all subcarriers.
- a part of the data requiring higher quality than the normal data is allocated to the subcarriers near both ends, so that a better data than the normal data is used.
- the effect of improving the error rate over time when quality is required is reduced.
- the present embodiment is different from FIG. 1 in the configuration in which the interleaving units 1101, 1102 are provided in FIG. 11 and the other configuration is the same as that in FIG. The description is omitted.
- the interleave section 1101 interleaves the systematic bit data coded by the encoding section 101 at the same time, and outputs it to the modulation section 102.
- the interleaving section 1102 interleaves the parity bit data encoded in the encoding section 101 in the evening mode and outputs the interleaved parity bit data to the modulating section 102.
- the systematic bit data and the parity bit data are independently transmitted and received.
- the transmission data is rearranged by the subcarrier arranging unit 103, so that it is possible to prevent the systematic bit data from being allocated to the subcarriers on both frequency sides due to interleaving.
- Systematic bit rate can improve the error rate performance in the evening.
- the parity bit data is correctly demodulated by performing the interleaving. be able to. Further, even if errors occur consecutively in the systematic bit data arranged in the subcarrier near the center frequency F1, the systematic bit data can be correctly demodulated.
- error correction is performed using an evening-both encoder.
- the present invention is not limited to this. Is divided into transmission data that requires high quality and transmission data with good quality, and transmission data that requires good quality and transmission data with good quality can be independently transmitted separately. good.
- FIG. 12 is a diagram showing an arrangement of transmission data for each subcarrier according to Embodiment 7 of the present invention.
- a DC offset is generated by an analog circuit provided in an amplifier (not shown) of a wireless transmission unit, so that an error of a signal transmitted by a subcarrier near a DC point is generated. The rate is worse than the error rate of signals transmitted by other subcarriers.
- transmission data requiring high quality is not arranged in subcarriers including DC points.
- multi-carrier Since the configuration of the transmitting apparatus is the same as that of FIG. 1, the description is omitted.
- the subcarrier arranging unit 103 is a systematic system in which good quality is required for the subcarriers in the regions W21 and W22 near the center frequency F1 excluding the subcarrier 1201 including the DC point P1.
- the bit data is arranged, and the transmission data is rearranged so that the parity bit data is arranged in the subcarriers 1201, including the areas W20 and W23 near both ends and the DC point P1.
- the transmission data subjected to orthogonal frequency division multiplexing in OFDM section 104 is arranged in each subcarrier as shown in FIG.
- the subcarrier frequency regions W21 and W22 in which the systematic bits are arranged are changed according to the reception level of the adjacent channel interference wave. That is, when the reception level of the adjacent channel interference wave is high, the range of the frequency regions W 21 and W 22 where the systematic bit data is arranged is narrowed, and when the reception level of the adjacent channel interference wave is low, The range of the frequency regions W21 and W22 where the systematic bits are arranged is increased.
- the systematic bit data is added to the subcarrier of center frequency F1. Since no delay is arranged, it is possible to prevent the error rate characteristic from deteriorating due to the influence of the DC offset.
- the DC point: P1 is on the same frequency as the center frequency F1, but the DC point P1 is on the same frequency as the center frequency F1.
- the present invention is not limited to this, and can be applied to a case where the DC point and the center frequency exist on different frequencies.
- the transmission data is not limited to the systematic bit data and the parity bit data, but the required quality other than the systematic bit data and the parity bit data is not limited to the systematic bit data and the parity bit data. A different day—even in the evening.
- an encoder other than the turbo encoder can be used as the encoding unit 101.
- FIG. 13 is a diagram showing a configuration of the multi-carrier transmitting apparatus 130 according to Embodiment 8 of the present invention.
- a parity bit is obtained by independently and adaptively modulating systematic bit data and parity bit data independently using an error correcting code as an error correcting code.
- the transmitting apparatus that arranges the sub data on the subcarriers near both ends, it is characterized in that: based on the SSI signal, a part of the subcarrier in which the parity bit data is arranged is not transmitted. .
- This embodiment is different from FIG. 1 in the configuration in which the selection unit 1301 is provided. Parts having the same configuration as in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
- the selection unit 1301 is arranged in the subcarrier that is not transmitted from the parity bit data arranged in the subcarriers near both ends in the rearranged transmission data input from the subcarrier arrangement unit 103.
- a null signal is selected instead of the parity bit data, and the parity bit data including the selected null signal and the systematic bit data are output to the OFDM unit 104.
- the selection unit 13001 When selecting the parity bit data, the selection unit 13001 reduces the number of null signals to be selected because the number of subcarriers not to be transmitted is reduced when the line quality is lower than the input RSSI signal, so that the line quality is good. In such a case, the number of null signals to be selected is increased because more subcarriers are not transmitted.
- Figure 14 shows the signal spectrum for one subcarrier.
- the sidelobe component is larger nearer to the main lobe.
- the spectrum of Fig. 14 is arranged by the number of subcarriers as shown in Fig. 15, so the unnecessary frequency components, that is, sidelobe components, are dominated by the sidelobe components of the subcarriers at both ends. Become. For this reason, the side lobe component can be further reduced by arranging the parity bit data in the subcarriers near both ends and preventing transmission of some subcarriers with the sine bit set. is there. Therefore, unnecessary frequency components can be further reduced.
- the transmission data subjected to the orthogonal frequency division multiplexing processing in the OFDM section 104 has parity bit data arranged in the frequency domains W 30 and W 32, and the frequency domain W 31 Is a systematic bite.
- the subcarriers 1401, 1402, 1403, 1404 are subcarriers that are not transmitted, and the subcarriers 1401, 1402, 1403, A null signal is transmitted instead of 1404.
- 0 Multi-carrier communication schemes such as FDM and NI C-CDM are said to degrade the error rate characteristics if some subcarriers are not transmitted as a method of reducing peak power. Problems arise.
- an evening code is used as the error correction code, better quality is required for the systematic bit data than for the parity bit data. Therefore, it is possible to achieve both error rate characteristics and peak power reduction by not transmitting subcarriers in which parity bits are arranged.
- the multicarrier transmission apparatus and the multicarrier transmission method in the present embodiment in addition to the effects of the first embodiment, in addition to preventing the transmission of some of the parity bit data arranged in the subcarriers near both ends.
- the peak power is reduced with almost no reduction in the error rate. Out-of-band leakage can be reduced.
- a null signal is selected based on the RSI signal.
- the present invention is not limited to this, and a null signal can be selected using arbitrary line quality information.
- the number of subcarriers that do not transmit is four. However, the present invention is not limited to this. Any number of subcarriers that do not transmit can be arbitrarily selected.
- FIG. 17 is a diagram showing a configuration of a multi-carrier transmitting apparatus 170 according to Embodiment 9 of the present invention.
- the present embodiment is characterized in that, based on delay dispersion information, a selection unit does not transmit a part of subcarriers in which parity bit data is arranged.
- the selection unit 1701 selects, from the rearranged transmission data input from the subcarrier arrangement unit 103, the parity bit data allocated to the subcarriers near both ends based on the delay dispersion information. When it is time to input the parity bit data arranged in the subcarrier that is not transmitted, a null signal is selected instead of the parity bit data, and the parity bit data including the selected null signal and the systematic bit are selected. ⁇ Output the data to the OFDM section 104.
- the selection unit 17001 When selecting the parity bit data, the selection unit 17001 reduces the number of null signals to be selected because the number of subcarriers not to be transmitted is reduced when the delay spread is large, based on the input delay spread information. If the value is small, the number of null signals to be selected is increased because more subcarriers are not transmitted.
- the delay dispersion information is extracted from the received signal because it is included in the transmission signal and notified from the communication partner.
- the delay sharing information generating unit 180 is mainly composed of a delay circuit 1801, a subtracting circuit 1802, an absolute value converting circuit 1803, and an averaging circuit 1804.
- the delay circuit 1801 receives the signal after the FFT processing of the received signal preamble, delays the input signal, and outputs the delayed signal to the subtraction circuit 1802.
- the subtraction circuit 1802 calculates the difference between the signal levels of adjacent subcarriers and outputs the difference to the absolute value conversion circuit 1803.
- the absolute value conversion circuit 1803 converts the subtraction result input from the subtraction circuit 1802 into an absolute value. And outputs the result to the averaging circuit 1804.
- the averaging circuit 1804 averages the absolute values of the reception level differences input from the absolute value averaging circuit 1803 by the number of subcarriers to obtain delay dispersion information.
- the delay dispersion information obtained in this way is included in the transmission signal at the communication partner and transmitted.
- the delay dispersion information is not limited to the case where the communication partner seeks the delay dispersion information, and the delay dispersion may be detected from the received signal using the circuit in FIG. Detecting delay dispersion from a received signal is possible in the TDD communication system or the like. Since the transmission data allocated to each subcarrier after the orthogonal frequency division multiplexing processing in OFDM section 104 is the same as that in FIG. 16, description thereof will be omitted.
- the multicarrier transmission apparatus and the multicarrier transmission method of the present embodiment in addition to the effects of the first embodiment, it is also possible to prevent some of the parity bit data arranged in the subcarriers near both ends from being transmitted.
- it since it is parity bit data that does not require much higher quality compared to systematic bit data, it is necessary to reduce the peak power without substantially reducing the error rate. It is possible to reduce out-of-band leakage.
- the parity bit data allocated to the subcarrier to be transmitted is selected based on the delay dispersion information, it is necessary to change the number of subcarriers not to be transmitted due to the temporary transmission data because of the temporary delay. By inadvertently changing the number of subcarriers that are not transmitted, it is possible to prevent the peak power from becoming too high and causing out-of-band leakage to increase or the error rate performance from deteriorating.
- FIG. 19 is a diagram showing a configuration of the multi-carrier transmitting apparatus 190 according to Embodiment 10 of the present invention.
- the present embodiment is characterized in that, based on the reception level information, the selection section does not transmit a part of the subcarriers in which the bit rate information is arranged.
- This embodiment is different from FIG. 1 in the configuration in which the selection unit 1901 is provided. Parts having the same configuration as in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
- TDD is used as the access method
- the propagation path is the same for the uplink and the downlink, so there is a method that preferentially does not transmit subcarriers with reduced reception levels.
- the selection section 1901 in the rearranged transmission data input from the subcarrier arranging section 103, selects one of the parity bit data allocated to the subcarriers near both ends based on the reception level information. Therefore, when it is time to input the parity bit data arranged in the subcarrier that is not transmitted, a null signal is selected instead of the parity bit data, and the parity bit data including the selected null signal and the system Outputs the mark bit data to 0 FDM section 104.
- the selection unit 1901 When selecting the parity bit data, the selection unit 1901 replaces the parity bit data allocated to the sub-carriers whose reception level is lower than the received reception level information of each sub-carrier. A null signal is selected, and a systematic bit data and a parity bit data including a null signal are selected. It is possible to determine whether the reception level has decreased by an arbitrary method such as a case where a determination is made based on a predetermined threshold value or a case where a relative determination is made by comparing with a reception level of another subcarrier. . Since the transmission data allocated to each subcarrier after the orthogonal frequency division multiplexing processing in OFDM section 104 is the same as in FIG. 16, the description thereof will be omitted.
- the multicarrier transmission apparatus and the multicarrier transmission method of the present embodiment in addition to the effects of the first embodiment, it is also possible to prevent transmission of some parity bit data arranged in subcarriers near both ends. And not sending it is compared to systematic bit data Since the parity bit data does not require such high quality, the reduction of the peak power can be reduced and the out-of-band leakage can be reduced without substantially reducing the error rate. In addition, since a null signal is selected based on the reception level information, the parity bit data allocated to the subcarrier whose reception level has decreased is not transmitted at the next transmission, so that the error rate performance is further improved. And both reduction of peak power and reduction of unnecessary frequency components can be achieved.
- FIG. 20 is a diagram showing a configuration of the multi-carrier transmitting apparatus 2000 according to Embodiment 11 of the present invention.
- the present embodiment is characterized in that, based on the adjacent channel interference wave reception level information, the selection unit does not transmit a part of the subcarrier in which the parity bit data is arranged.
- This embodiment is different from FIG. 1 in the configuration in which the selection unit 2001 is provided. Parts having the same configuration as in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. It is also effective to determine the number of non-transmitted subcarriers in consideration of the reception level of adjacent channel interference waves. The higher the adjacent channel interference wave reception level, the worse the subcarrier quality at both ends. For this reason, the error rate performance may be improved by increasing the number of subcarriers that are not transmitted for the subcarriers at both ends. Also, it goes without saying that the peak power and the unnecessary frequency components are reduced.
- the selection unit 2001 performs parity bit data allocation at both ends of the subcarriers at which the influence of the adjacent channel interference wave reception level is the largest in the rearranged transmission data input from the subcarrier allocation unit 103.
- a null signal is selected instead of overnight, and a systematic bit data and a parity bit data including the selected null signal are output to the OFDM unit 104.
- the transmission data subjected to the orthogonal frequency division multiplexing processing in the FDM section 104 has parity bit data arranged in the frequency domains W 40 and W 42, and the frequency domain W 41 Is a systematic bite.
- the subcarriers 2101 and 2102 at both ends are non-transmitted subcarriers, and a null signal is transmitted instead of the subcarriers 2101 and 2102.
- the number of non-transmitted subcarriers is two.However, the number of non-transmitted subcarriers is not limited to two, and it is possible not to transmit an arbitrary number of subcarriers on the center frequency side from both ends. it can.
- the multicarrier transmission apparatus and the multicarrier transmission method according to Embodiments 1 to 11 can be applied to a base station apparatus and a communication terminal apparatus.
- the error rate characteristic of transmission data requiring good quality is remarkably improved, and the quality of transmission data requiring good quality is prevented from deteriorating. be able to.
- the present invention is suitable for use in a multicarrier transmission apparatus and a multicarrier transmission method.
Abstract
Description
Claims
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EP03748632A EP1551121A4 (en) | 2002-10-10 | 2003-10-01 | MULTI-CARRIER TRANSMISSION APPARATUS AND METHOD |
US10/530,368 US7529315B2 (en) | 2002-10-10 | 2003-10-01 | Multi-carrier transmitting apparatus and multi-carrier transmitting method |
AU2003268705A AU2003268705A1 (en) | 2002-10-10 | 2003-10-01 | Multi-carrier transmitting apparatus and multi-carrier transmitting method |
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JP2003007616A JP3732830B2 (ja) | 2002-10-10 | 2003-01-15 | マルチキャリア送信装置及びマルチキャリア送信方法 |
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EP (1) | EP1551121A4 (ja) |
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Also Published As
Publication number | Publication date |
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US20060160498A1 (en) | 2006-07-20 |
JP2004187257A (ja) | 2004-07-02 |
EP1551121A1 (en) | 2005-07-06 |
AU2003268705A1 (en) | 2004-05-04 |
JP3732830B2 (ja) | 2006-01-11 |
EP1551121A4 (en) | 2009-06-10 |
US7529315B2 (en) | 2009-05-05 |
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