WO2004040832A1 - 送信装置及び送信方法 - Google Patents
送信装置及び送信方法 Download PDFInfo
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- WO2004040832A1 WO2004040832A1 PCT/JP2003/013806 JP0313806W WO2004040832A1 WO 2004040832 A1 WO2004040832 A1 WO 2004040832A1 JP 0313806 W JP0313806 W JP 0313806W WO 2004040832 A1 WO2004040832 A1 WO 2004040832A1
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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
- 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
- H03M13/25—Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM]
-
- 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
- H03M13/25—Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM]
- H03M13/256—Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM] with trellis coding, e.g. with convolutional codes and TCM
-
- 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
- H03M13/25—Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM]
- H03M13/258—Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM] with turbo codes, e.g. Turbo Trellis Coded Modulation [TTCM]
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
- H04L1/0004—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes applied to control information
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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
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1893—Physical mapping arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
- H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
- H04L27/2053—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases
- H04L27/206—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
Definitions
- the present invention relates to a transmission apparatus and a transmission method, and more particularly to a transmission apparatus and a transmission method for transmitting transmission data that has been encoded using a single-point encoder.
- FIG. 1 shows an example of a conventional transmitting apparatus using an evening code.
- the transmitting apparatus 10 shown in FIG. 1 includes an evening encoding section 11, a parallel serial (hereinafter referred to as “PZS”) converting section 12, a spreading section 13, a radio transmitting section 14 and an antenna 15. I have it.
- the evening code encoder 11 receives the transmission signal, performs turbo coding, generates a systematic bit data and a parity bit data, and provides them to the PZS converter 12.
- the P / S conversion section 12 receives the systematic bit data and parity bit data from the evening encoding section 11 and performs PZS modulation to generate a serial modulation signal and generate a spread signal.
- PZS parallel serial
- Spreading section 13 spreads the modulated signal from PZS conversion section 12 to generate a spread signal, and provides the spread signal to radio transmitting section 14.
- the spreading section 13 uses the same spreading code for the systematic bit data and the parity bit data of the modulated signal, and The rate and the number of spreading codes to be assigned are the same.
- Radio transmitting section 14 receives the spread signal from spreading section 13 and transmits it via antenna 15.
- Some devices have means for allocating and spreading a plurality of spread signals to the signal.
- the conventional CDMA transmitting apparatus includes a data adding unit for converting a variable bit input data sequence into a data sequence XA of a predetermined number of bits, and a code conversion unit for converting the data sequence XA.
- a first encoding unit that encodes the data stream XA ′ after the in-leave, and a puncturing output of the first and second encoding units 2 And two punctures.
- An object of the present invention is to provide a transmission device and a transmission method that can further achieve both error rate characteristics and transmission efficiency.
- the purpose is to adaptively modulate the systematic bit data and the parity bit data independently. That is, when the line quality is degraded, the systematic bit rate is changed to a modulation scheme with a small number of values to prevent a decrease in the error rate characteristic. When an error occurs, the systematic bit rate is reduced. This can be achieved by performing error correction with a parity bit transmitted by a modulation scheme having a larger number of levels than that of the data transmission and reducing the number of retransmissions in the data transmission.
- FIG. 1 is a block diagram showing a configuration of a conventional transmission device
- FIG. 2 is a block diagram showing a configuration of a transmitting apparatus according to Embodiment 1 of the present invention
- FIG. 3 is a block diagram showing a configuration of an encoding unit according to Embodiment 1 of the present invention
- FIG. FIG. 5 is a block diagram illustrating the operation of the transmitting apparatus according to Embodiment 1 of the present invention
- FIG. 5 is a block diagram illustrating the configuration of the transmitting apparatus according to Embodiment 2 of the present invention
- FIG. FIG. 8 is a block diagram illustrating a configuration of a control unit according to Embodiment 2
- FIG. 8 is a schematic diagram illustrating an operation of a transmission apparatus according to Embodiment 2 of the present invention
- FIG. 8 is a diagram illustrating an operation according to Embodiment 3 of the present invention.
- FIG. 9 is a block diagram illustrating a configuration of a transmission apparatus according to Embodiment 4 of the present invention.
- FIG. 10 is a block diagram illustrating a configuration of a transmission apparatus according to Embodiment 5 of the present invention.
- FIG. 11 is a block diagram showing a configuration of a transmitting apparatus according to Embodiment 6 of the present invention.
- FIG. 12 is a diagram for explaining an operation of the transmitting apparatus according to Embodiment 6 of the present invention.
- c Note a diagram illustrating a transmission apparatus 1 0 0 configuration according to the first embodiment of the present invention, in the first embodiment, two types of modulation scheme of QPSK and 1 6 QAM The case where it is used will be described. Also, in the first embodiment, the modulation scheme with a large number of multi-values is 16 QAM, and the modulation scheme with a small number of multi-values is QPSK.
- Transmitting apparatus 100 includes a control unit 101 B coding unit 102, modulation unit 103, P / S conversion unit 105, spreader 106, serial / parallel (hereinafter referred to as “S / P”) conversion unit 107, inverse It is mainly composed of a discrete Fourier transform unit (IDFT) 108 and an antenna 109. Further, the modulation section 103 is mainly composed of a first modulation section 103 a and a second modulation section 103 b.
- the control unit 101 determines the communication quality using an RSSI (Received Signal Strength Indicator) signal, and outputs a control signal according to the communication quality to the second modulation unit 103 b.
- RSSI Receiveived Signal Strength Indicator
- the control unit 101 transmits the control signal to the second modulation unit. Do not output to 103 b.
- the modulation scheme having a large number of multi-values refers to a modulation scheme having a large number of constellation matching points on the I-Q plane.
- the evening encoding unit 102 is, for example, an evening encoding unit, and encodes a part of the input transmission data as a systematic bit data without encoding a part of the input transmission data to the first modulation unit 103a. In addition to the output, the remaining part of the input transmission data is subjected to recursive convolutional coding, and output to the second modulation section 103b as a parity bit data.
- the turbo encoding unit 102 may be an encoder other than the Yuichibo encoder. The details of the Yuichibo encoding unit 102 will be described later.
- the first modulation section 103a has a modulation scheme fixed to QPSK, performs QPSK modulation on the systematic bit data input from the evening encoding section 102, and performs PZS conversion. Output to section 105.
- the second modulator 103 b performs QPSK modulation or 16 QAM modulation on the parity bit data input from the turbo encoder 102 based on the control signal input from the controller 101. , And outputs the result to the P / S converter 105.
- the method of changing the modulation scheme will be described later.
- the PZS converter 105 converts the systematic bit data input from the first modulator 103a and the parity bit data input from the second modulator 103b from parallel data to serial data. And outputs it to the diffuser 106.
- Spreader 106 which is a spreading means, multiplies the transmission data input from S / P conversion section 107 by a spreading code and outputs the result to SZP conversion section 107.
- the spreading factor is multiplied by a spreading code other than “1”.
- the spreading factor is set to “1”. Multiply the sign.
- the S / P conversion unit 107 converts the transmission data input from the spreader 106 from serial data into parallel data and outputs it to the inverse discrete Fourier transform unit 108.
- the inverse discrete Fourier transform unit 108 converts the data into a sum of N (N is an arbitrary natural number) subcarriers of different frequencies to generate a transmission data, and transmits the generated transmission data from the antenna 109. I do.
- N is an arbitrary natural number
- the number of multiplexed signals of each subcarrier is “1” and the number of multiplexed codes of the transmitted signal is “1”.
- the SZP converter 107 and the inverse discrete Fourier transformer 108 constitute orthogonal frequency division multiplexing means.
- the evening code encoding unit 102 is mainly composed of an input receiver 201, a convolution encoding unit 202, and a convolution encoding unit 203.
- the data receiver 201 retrieves the transmission data and outputs it to the convolutional encoder 203.
- the convolutional encoder 202 recursively convolutionally encodes a part of the transmission data and outputs the result to the second modulator 103b.
- the output from the convolutional encoder 202 is parity bit data.
- the convolution encoding unit 203 recursively convolutionally codes a part of the transmission data input from the in-leaver 201 and outputs the result to the second modulation unit 103b.
- the output from the convolutional code unit 203 is parity bit data.
- a part of the transmission data input to the turbo encoder 102 is output as it is without encoding. You. This output is the systematic bit data.
- the transmission data is encoded by the turbo coding unit 102 (step (hereinafter, referred to as "ST" 3) 301) 301, and the systematic bit data is output to the first modulation unit 103a. Then, the first bit data is output to the second modulator 103b.
- the systematic bit data input to first modulation section 103a is subjected to QPSK modulation and output to PS conversion section 105 (ST 302).
- the control unit 101 determines whether or not the RSSI signal is equal to or greater than the threshold based on the RSSI signal (ST303). If the RSSI signal is equal to or greater than the threshold, the communication unit 101 determines that the communication quality is good. Control section 101 outputs a control signal for setting the modulation scheme to 16QAM to second modulation section 103b. Second modulation section 103b sets the modulation scheme to 16 QAM based on the control signal that sets the modulation scheme input from control section 101 (ST 304). The parity bit data input to second modulation section 103b is subjected to 16 QAM modulation and output to P / S conversion section 105 (ST 305).
- control section 101 when the R SS I signal is less than the threshold, control section 101 outputs a control signal for setting the modulation method to Q PSK to second modulation section 103b.
- Second modulation section 103b sets the modulation scheme to QPSK based on the control signal for setting the modulation scheme input from control section 101 (ST 306).
- the parity bit data input to second modulation section 103b is QPSK-modulated and output to PZS conversion section 105 (ST 307).
- PZS conversion section 105 converts the systematic bit data and parity bit data from parallel data to serial data and outputs them to spreader 106 (ST 308).
- the transmission data is multiplied by a spreading code in a spreader 106 (ST309), subjected to SZP transform processing and inverse discrete Fourier transform processing as orthogonal frequency division multiplexing processing, and transmitted from an antenna 109. (ST310).
- the systematic A bit rate modulation method with a small number of multi-levels is used to prevent the degradation of the error rate characteristics, and when an error occurs, a modulation method with a larger number of values than the systematic bit rate is used.
- Error correction can be performed with the parity bit transmitted in step (1), and the number of retransmissions of transmission data is reduced.
- the error rate performance can be improved by changing the systematic bit rate to a modulation scheme with a large number of values, and when an error occurs, the systematic bit rate can be improved.
- Error correction can be performed with parity bits transmitted using a modulation method that has a smaller number of values than bit data but does not degrade error rate characteristics, and reduces the number of retransmissions in transmission data .
- systematic bit data and parity bit data are independently modulated, and the modulation scheme of parity bit data is adaptively changed according to communication quality. Therefore, it is possible to achieve both improvement of the error rate characteristic and improvement of the transmission efficiency.
- the independently modulated systematic bit data and parity bit data are subjected to spreading processing and then orthogonal frequency division multiplexing, the error rate characteristics of transmission data can be further improved.
- only the parity bit data is adaptively modulated according to the communication quality.However, only the systematic bit data is adaptively modulated according to the communication quality. You may do it.
- FIG. 5 is a diagram showing a configuration of transmitting apparatus 400 according to Embodiment 2 of the present invention.
- Embodiment 2 a case will be described in which two types of modulation schemes, QPSK and 16 QAM, are used. Further, in Embodiment 2, the modulation scheme with a large number of multi-values is 16 QAM, and the modulation scheme with a small number of multi-values is QPSK.
- Modulating section 402 in Embodiment 2 mainly includes a first modulating section 402 a and a second modulating section 402 b. Embodiment 2 is characterized in that the modulation schemes in both the first modulation section 402 a and the second modulation section 402 b are adaptively modulated according to the communication quality. . Controlled by the first modulation section 402a The difference from FIG. 2 is that the control signal is input from the unit 401, and the description of the same components as in the first embodiment is omitted.
- the control unit 401 determines the communication quality using the RSSI signal, and outputs a control signal corresponding to the communication quality to the first modulation unit 402a and the second modulation unit 402b.
- the control unit 401 sets a threshold value for setting a modulation method for modulating the systematic bit data when setting the modulation method, and sets a modulation method for modulating one parity bit data. And two types of thresholds.
- a control signal for setting the modulation method to a modulation method with a large number of values of 16QA ⁇ is output to the first modulation section 402a, and: If is greater than or equal to the threshold value, a control signal for setting the modulation scheme to a modulation scheme with a large number of multi-levels of 16 QAM is output to second modulation section 402b.
- control section 401 outputs a control signal for setting the modulation scheme to the modulation scheme with a small number of QPSK values to first modulation section 402 a, If the I signal is less than threshold value 5, a control signal for setting the modulation scheme to a modulation scheme with a small number of QPS levels is output to second modulation section 402b. Note that, if the current modulation scheme is being used and the currently used modulation scheme is to be continuously used as a result of the determination in the control section 401, the control section 401 transmits the control signal to the first modulation section 402a and the second modulation section 402a. It is not necessary to output to the second modulation section 402b. The details of the configuration of the control unit 401 will be described later.
- First modulation section 402a performs QPSK modulation or 16QAM modulation on the systematic bit data input from evening encoding section 102 based on the control signal input from control section 401. And outputs it to the PZS converter 105.
- the second modulation unit 402b performs adaptive modulation of QPSK modulation or 16 QAM modulation on the parity bit data input from the evening encoding unit 102 based on the control signal input from the control unit 401. And outputs it to the PZS converter 105. The method of changing the modulation scheme will be described later. Next, details of the configuration of the control unit 401 will be described with reference to FIG.
- the control unit 401 mainly includes a first determination control unit 501 and a second determination control unit 502.
- first determination control section 501 If the RSSI signal is equal to or larger than a preset threshold ⁇ , first determination control section 501 outputs a control signal for setting the modulation method to 16 QAM to first modulation section 402. On the other hand, if the RSSI signal is less than the threshold value, the control signal to set the modulation method to QPSK is output to first modulation section 402a.
- second determination control section 502 If the RSSI signal is equal to or greater than a preset threshold ⁇ , second determination control section 502 outputs a control signal for setting the modulation method to 16 QAM to first modulation section 402. On the other hand, if the RSSI signal is less than the threshold value / ?, a control signal for setting the modulation method to QPSK is output to second modulation section 402b.
- the threshold value is set to an RSSI value higher than the threshold value 5.
- the systematic bit data is always modulated by the same modulation method as the parity bit data or a modulation method having a smaller number of levels than the modulation method of the parity bit data.
- the transmission data is encoded by the turbo encoding unit 102 (ST 601), the systematic bit data is output to the first modulation unit 402a, and the parity bit data is encoded by the second modulation unit 402b. Output to
- the control unit 401 determines whether or not the RSSI signal is higher than the threshold value based on the RSSI signal (ST602). If the RSSI signal is higher than the threshold value, the communication quality is good. Then, control section 401 outputs a control signal for setting the modulation method to 16QAM to first modulation section 402a. First modulation section 402a sets the modulation scheme to 16QAM based on the control signal for setting the modulation scheme input from control section 401 (ST 603). The systematic bit data input to the first modulation section 402a is subjected to 16 QAM modulation to the P / S conversion section 105. It is output (ST 604).
- control section 401 outputs a control signal for setting the modulation method to QPSK.
- First modulation section 402a sets the modulation scheme to QPSK based on the control signal for setting the modulation scheme input from control section 401 (ST 605).
- the systematic bit data input to second modulation section 402b is QPSK-modulated and output to P / S conversion section 105 (ST 606).
- control section 401 determines whether or not the RSSI signal is greater than or equal to a threshold? (ST 607). As a result, the control section 401 outputs a control signal for setting the modulation scheme to 16 QAM to the second modulation section 402b. Second modulation section 402 b sets the modulation scheme to 16QAM based on the control signal for setting the modulation scheme input from control section 401 (ST 608). The parity bit data input to second modulation section 402b is subjected to 16QAM modulation and output to PZS conversion section 105 (ST 609).
- control section 401 outputs a control signal for setting the modulation scheme to QPSK to second modulation section 402b.
- the second modulation section 402b sets the modulation scheme to QPSK based on the control signal that sets the modulation scheme input from the control section 401 (ST 610).
- C The parity bit input to the second modulation section 402b
- the data is QPSK-modulated and output to P / S conversion section 105 (ST611).
- P / S conversion section 105 converts the systematic bit data and the non-sity bit data from parallel to serial and outputs them to diffuser 106 (ST 612).
- the transmission data is multiplied by a spreading code in a spreader 106 (ST 613), subjected to SZP transform processing and inverse discrete Fourier transform processing as orthogonal frequency division multiplexing processing, and transmitted from an antenna 109. (ST614) o
- control section 401 compares the RSSI signal with different thresholds in the case of systematic bit data and in the case of parity bit data, so that communication quality changes. Therefore, it is possible to flexibly cope with the problem and improve both the error rate characteristics and the transmission efficiency.
- the threshold value and the threshold value /? Used for determining whether the communication quality is equal to or higher than the RSSI signal are set to different values.
- the threshold value /? May be set to the same value, or the value of the threshold value may be smaller than the value of the threshold value?.
- FIG. 8 is a diagram showing a configuration of transmitting apparatus 700 according to Embodiment 3 of the present invention.
- Embodiment 3 a description will be given of a case where QPSK is used as a modulation scheme with a small number of levels when two types of modulation schemes, QPSK and 16 QAM, are used.
- the modulation scheme with a large number of levels is 16 QAM
- the modulation scheme with a small number of levels is QPSK.
- transmission data that does not require good reception quality (other data) is modulated by 16 QAM with a large number of values, while transmission data that requires good reception quality is modulated.
- the modulation method in both the first modulation section 103a and the second modulation section 103b is always set to the modulation method with a small number of QP SK values. Things. Parts having the same configuration as in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.
- First modulation section 103a modulates the transmission data by QPSK and outputs the result to PZS conversion section 105.
- Second modulation section 103b modulates the transmission data by QPSK and outputs the result to PZS conversion section 105.
- the transmission data is transmitted with good communication such as control information and retransmission information. Quality is required. It should be noted that the transmission data is not limited to the control information and the retransmission information, but includes those requiring good communication quality.
- the systematic bit data and parity bit data are each independently modulated, and the modulation scheme is fixedly set to a modulation scheme with a small number of values, the transmission data
- the modulation scheme is fixedly set to a modulation scheme with a small number of values
- the transmission data when good communication quality such as control information and retransmission information is required, it is possible to achieve both improvement of the error rate characteristic and improvement of the transmission efficiency.
- the systematic bit data and the parity bit data independently modulated are subjected to the orthogonal frequency division multiplexing after being spread, the error rate characteristics of the transmission data can be further improved.
- the modulation scheme is QPSK in the third embodiment
- the modulation scheme is not limited to QPSK, and may be other than QPSK as long as the modulation scheme has a small number of values.
- the first modulation section 103a and the second modulation section 103b are both modulated by QPSK.However, it is not always necessary to use the same modulation scheme. However, the first modulation section 103a and the second modulation section 103b may have different modulation schemes.
- FIG. 9 is a block diagram showing a configuration of a transmitting apparatus according to Embodiment 4 of the present invention.
- transmitting apparatus 800 includes an evening-both encoding section 801, a spreading apparatus 800, a spreading section 803, a parallel serial (P / P S) It includes a conversion section 804, a radio transmission section 805, and an antenna 806.
- the diffusion device 800 has a plurality of diffusion units 8002-1, 8002-2, and an addition unit 8002-2.
- the input terminals of the spreading sections 802-1 and 802-2 and the spreading section 803 are connected to the output terminals of the evening-both encoding section 81.
- the input terminals of the adders 802-2-3 are connected to the output terminals of the spreaders 802-1 and 802-2.
- the input terminal of the parallel-serial conversion unit 804 is connected to the output terminal of the addition unit 802-3 and the diffusion unit 803.
- the input terminal of the wireless transmission section 805 is connected to the output terminal of the parallel-serial conversion section 804.
- the input terminal of the antenna 806 is connected to the output terminal of the wireless transmission unit 805.
- the receiver encoding unit 8001 receives the transmission signal, performs receiver encoding, generates systematic bit data and parity bit data, and spreads the systematic bit data. 2-1 and 802 to 2 and the nobility data to the diffusion unit 803.
- the spreading device 8002 assigns a plurality of different spreading codes to the systematic bit data from the evening encoding unit 801 and spreads the systematic bit data in the evening to spread the systematic bit data.
- the systematic bit data is multiplexed, and the multiplexed systematic bit data is supplied to the parallel / serial conversion unit 804.
- the spreading sections 802-1 and 800-2-2 assign different spreading codes to the systematic bit data from the evening encoding section 811, and assign The bitstream is diffused, and the systematic bitstream after the diffusion is given to the adder 800-2-3.
- the adder 800-2-3 receives the spread of the systematic bits from the spreaders 802-1 and 802-2 and multiplexes them, and multiplexes the multiplexed systematic bits.
- the data is supplied to the parallel-to-serial converter 804.
- the spreading section 803 receives the parity bit data from the turbo coding section 801 and allocates and spreads one spreading code.
- the spread bit data is then converted to a P / S conversion section 803 Give to.
- the PZS converter 804 modulates the systematic bit data from the adder 802-3 and the parity bit data from the spreader 803 into one serial modulated signal. To transmit the modulated signal to the wireless transmission section 805. Radio transmitting section 805 receives the modulated signal from PZS converting section 804 and transmits it via antenna 806.
- spreading apparatus 802 assigns three or more different spreading codes to the systematic bit data, spreads the systematic bit data, and spreads the systematic bit after spreading.
- Data may be multiplexed, and the multiplexed systematic bit data may be provided to the PZS converter 804.
- the number of spreading codes of spreading apparatus 802 may be variable based on channel quality (for example, R SSI) and multipath delay dispersion time information.
- a plurality of spreading codes may be assigned to parity bit data, a plurality of spreading codes of parity bit data may be variable, and a plurality of May be variable based on channel quality (eg, SSI) and multipath delay dispersion time information.
- channel quality eg, SSI
- the number of spreading codes assigned to systematic bit data requiring good channel quality is low, and the number of spreading codes assigned to parity bit data may be low for channel quality. Since the number is larger than the number, it is possible to improve the error rate characteristics and the transmission efficiency at the same time. (Embodiment 5)
- FIG. 10 is a block diagram showing a configuration of a transmitting apparatus according to Embodiment 5 of the present invention.
- C In Embodiment 5 of the present invention, the same components as those of Embodiment 4 of the present invention are the same. The reference numerals are attached and the description is omitted.
- transmitting apparatus 900 includes: an encoding section 801, a spreading section 901, a spreading section 803, a spreading factor setting section 902, a parallel-serial conversion unit 804, a wireless transmission unit 805, and an antenna 806.
- the input terminal of the spreading unit 901 is connected to the output terminal of the evening code unit 801.
- the output terminal of the diffusion unit 901 is connected to the input terminal of the PZS conversion unit 804.
- the output terminal of the spreading factor setting unit 902 is connected to the control terminals of the spreading unit 803 and the spreading unit 901.
- the spreading factor setting unit 902 sets the first spreading factor and a second spreading factor that is larger than the first spreading factor, gives the first spreading factor to the spreading unit 803, and Is given to the diffusion unit 901.
- Turbo encoding section 8001 receives the transmission signal, performs one-time encoding and generates a systematic bit data and a parity bit data, and transmits the systematic bit data to spreading section 91. And the parity bit data is spread by the spreading unit 803 Oo
- the spreading unit 803 receives the parity bit data from the encoding unit 801 and assigns and spreads one spreading code.
- the spread parity bit data is PZ
- the spreading unit 901 assigns one spreading code to the systematic bit data from the evening encoding unit 801 and spreads the systematic bit data at the second spreading factor.
- the systematic bit data after the diffusion is given to the P / S converter 804.
- the spreading device 802 is provided with a plurality of spreading factors larger than the first spreading factor to the spreading portions 802-1 and 802-2 of the spreading device 8002 as described above.
- a plurality of spreading codes may be allotted to the Tode overnight, and spreading may be performed with the plurality of spreading factors.
- the spreading factors of spreading sections 803 and 901 may be variable based on channel quality (for example, RSS) and multipath delay dispersion time information. Further, one of the spreading factors of the spreading units 803 and 901 may be appropriately variable. Further, in Embodiment 5 of the present invention, the parity bit data may be spread with a plurality of spreading factors, the plurality of spreading factors of the parity bit data may be variable, and the plurality of parity bit data may be variable. The spreading factor may be variable based on line quality (eg, RSSI) and multipath delay dispersion time information.
- line quality eg, RSSI
- Embodiment 5 of the present invention since the spreading factor of the systematic bit data where good channel quality is required is set to a value larger than that of the parity bit data, It is possible to achieve both improvement of the error rate characteristic and improvement of the transmission efficiency.
- FIG. 11 is a block diagram showing a configuration of a transmitting apparatus according to Embodiment 6 of the present invention.
- FIG. 11 is a diagram for explaining an operation of the transmitting apparatus according to Embodiment 6 of the present invention.
- the same components as those in the fourth embodiment of the present invention are denoted by the same reference numerals, and description thereof will be omitted.
- transmitting apparatus 1000 according to Embodiment 6 of the present invention includes orthogonal frequency division multiplexing apparatus 100 1 in transmitting apparatus 800 according to Embodiment 4 of the present invention. Is added.
- the transmitting apparatus 1000 includes a decoding unit 8001, a spreading apparatus 802, a spreading unit 803, a parallel-serial converting unit 804, It comprises an orthogonal frequency division multiplexing (OFDM) device 1001, a radio transmission unit 805 and an antenna 806.
- the spreading device 802 has a plurality of spreading units 802-1, 802-2 and an adding unit 802-2.
- An input terminal of the orthogonal frequency division multiplexing device 1001 is connected to an output terminal of the PZS converter 804.
- An output terminal of the orthogonal frequency division multiplexing device 1001 is connected to an input terminal of the wireless transmission unit 805.
- Orthogonal frequency division multiplexing apparatus 1001 receives the modulated signal from PZS conversion section 804, performs orthogonal frequency division multiplexing to generate an OFDM-CDMA signal, and provides it to radio transmission section 805.
- Radio transmitting section 805 receives the OFDM-CDMA signal from orthogonal frequency division multiplexing apparatus 1001, and transmits the signal via antenna 806.
- the orthogonal frequency division multiplexing apparatus 1001 sets the spreading ratio to 1-5 of the number of subcarriers, divides all subcarriers into five groups G1 to G5, and performs parallel-serial conversion.
- the systematic bit data and the parity bit data of the modulated signal from the section 104 are arranged in subcarriers for each of the groups G1 to G5.
- the parallel-serial conversion unit 804 rearranges the modulation signals so as to have a subcarrier arrangement as shown in FIG.
- the diffusion ratio is not limited to the subcarrier number 1Z5, but may be any value.
- the diffusion ratio of each subcarrier group is not necessarily required to be the same, and can be set to an arbitrary value.
- a communication method (generally, a combination of the CDMA communication method and the multicarrier communication method (including the OFDM method)) is used.
- the number of spreading codes assigned to user signals to be retransmitted is increased as the number of retransmissions is increased. In this case, it is possible to prevent an excessive increase in the number of retransmissions.
- the multi-carrier Since the interference between adjacent codes before and after in a multipath environment can be removed by a guard interval, the error rate in a multipath environment can be greatly improved compared to the CDMA method, and the number of retransmissions is further prevented from increasing. be able to.
- adaptive modulation is performed using 16QAM and QP SK.However, the present invention is not limited to this, and modulation schemes such as 8 PSK and BPSK other than 16QAM and QP SK are used. Adaptive modulation may be performed.
- systematic bit data is modulated by the first modulator and parity bit data is modulated by the second modulator.
- one modulation unit may modulate the systematic bits and the parity bits.
- the communication quality is determined based on the RSSI signal.
- the present invention is not limited to this.
- the communication quality may be determined based on a signal other than the RSSI signal or the like.
- the transmission apparatus and the transmission method according to Embodiments 1 to 6 are applicable to any communication method such as CDMA, OFDM, OFDM-CDMA, multicarrier CDMA, and single carrier.
- the transmitting apparatus and the transmitting method according to Embodiments 1 to 6 can be applied to a base station apparatus and a communication terminal apparatus.
- the present invention relates to a transmission device and a transmission method, and is particularly suitable for use in a transmission device and a transmission method for transmitting transmission data that has been encoded using an Elliptic encoder.
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Probability & Statistics with Applications (AREA)
- Theoretical Computer Science (AREA)
- Quality & Reliability (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Error Detection And Correction (AREA)
Abstract
Description
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Priority Applications (3)
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EP03769922A EP1503535A4 (en) | 2002-10-31 | 2003-10-29 | TRANSMISSION DEVICE AND METHOD |
AU2003280576A AU2003280576A1 (en) | 2002-10-31 | 2003-10-29 | Transmitting device and transmitting method |
US10/515,913 US7281189B2 (en) | 2002-10-31 | 2003-10-29 | Apparatus and method for separately modulating systematic bits and parity bits in accordance with communication quality |
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JP2002317728A JP3619821B2 (ja) | 2002-10-31 | 2002-10-31 | 送信装置及び送信方法 |
JP2002-317728 | 2002-10-31 | ||
JP2002-350026 | 2002-12-02 | ||
JP2002350026A JP4197428B2 (ja) | 2002-12-02 | 2002-12-02 | Cdma送信装置及び方法 |
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WO2004040832A1 true WO2004040832A1 (ja) | 2004-05-13 |
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PCT/JP2003/013806 WO2004040832A1 (ja) | 2002-10-31 | 2003-10-29 | 送信装置及び送信方法 |
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US (1) | US7281189B2 (ja) |
EP (1) | EP1503535A4 (ja) |
AU (1) | AU2003280576A1 (ja) |
WO (1) | WO2004040832A1 (ja) |
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JP4065283B2 (ja) | 2005-07-06 | 2008-03-19 | 松下電器産業株式会社 | 送信方法 |
PL3337113T3 (pl) | 2005-09-30 | 2020-11-16 | Optis Wireless Technology, Llc | Urządzenie do transmisji radiowej oraz sposób transmisji radiowej |
FR2894416B1 (fr) | 2005-12-05 | 2008-02-29 | Commissariat Energie Atomique | Procede et dispositif de selection des parametres d'etalement d'un systeme ofdm cdma |
FI20065826A0 (fi) * | 2006-12-20 | 2006-12-20 | Nokia Corp | Koodaus ja dekoodaus menetelmä ja laite |
KR101192359B1 (ko) * | 2007-12-17 | 2012-10-18 | 삼성전자주식회사 | Nand 플래시 메모리 소자 및 그 제조 방법 |
KR100925440B1 (ko) | 2008-01-28 | 2009-11-06 | 엘지전자 주식회사 | 물리 하이브리드 arq 지시 채널 할당 방법 |
US10305630B2 (en) * | 2015-10-30 | 2019-05-28 | Panasonic Corporation | Base station, controller, communication system, and interference avoidance method |
CN115865590A (zh) * | 2021-09-23 | 2023-03-28 | 中兴通讯股份有限公司 | 信号调制方法、设备和存储介质 |
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EP1503535A4 (en) | 2011-07-06 |
AU2003280576A1 (en) | 2004-05-25 |
US7281189B2 (en) | 2007-10-09 |
US20050229073A1 (en) | 2005-10-13 |
EP1503535A1 (en) | 2005-02-02 |
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