WO2004047347A1 - 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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- WO2004047347A1 WO2004047347A1 PCT/JP2003/014418 JP0314418W WO2004047347A1 WO 2004047347 A1 WO2004047347 A1 WO 2004047347A1 JP 0314418 W JP0314418 W JP 0314418W WO 2004047347 A1 WO2004047347 A1 WO 2004047347A1
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Classifications
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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
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
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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
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
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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
- H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
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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
- H04L1/1874—Buffer management
- H04L1/1877—Buffer management for semi-reliable protocols, e.g. for less sensitive applications like streaming video
Definitions
- the present invention relates to a transmission apparatus and a transmission method using a multi-carrier modulation scheme such as an OFDM (Orthogonal Frequency Division Multiplexing) scheme.
- a multi-carrier modulation scheme such as an OFDM (Orthogonal Frequency Division Multiplexing) scheme.
- OFDM transceivers adopt a frame configuration in which a signal with the same waveform as the end of an effective symbol is added to the beginning of the effective symbol as a guard interval (hereinafter referred to as “GI”).
- GI guard interval
- Delayed waves with a delay time shorter than the length of the guard section can be removed by fast Fourier transform (FFT) processing in the receiving system.
- FFT fast Fourier transform
- the delay time of the multipath is longer than the length of GI, or if there is a timing error, the previous signal may leak into the effective symbol of the next signal, causing intersymbol interference.
- GI is inserted into the signal processed by Inverse Fast Fourier Transform (hereinafter referred to as "IFFT"), and the signal is converted from a digital signal to an analog signal, thereby obtaining a transmission signal.
- IFFT Inverse Fast Fourier Transform
- the received signal is converted from an analog signal to a digital signal. Then, the received signal from which GI has been removed by the GI removal circuit is subjected to FFT processing to obtain a baseband signal.
- the baseband signal is synchronously detected by a synchronous detector to obtain a synchronously detected signal.
- Multi-carrier modulation is a technology that achieves high-speed transmission by transmitting data using multiple carriers (subcarriers) whose transmission speed is suppressed to the extent that frequency-selective fading does not occur. is there.
- the OFDM method has the highest frequency use efficiency among multi-carrier modulation methods because multiple subcarriers on which data are arranged are orthogonal to each other, and is realized with a relatively simple hardware configuration. It is of particular interest because it can be done, and various considerations are being made.
- a transmission error of a received signal is detected, and when an error is detected, a retransmission request signal is transmitted to a wireless station of a communication partner.
- the wireless station of the communication partner receiving the retransmission request retransmits the data corresponding to the retransmission request. This process is repeated until there is no error in the received signal.
- This series of processing is called AR Q.
- An object of the present invention is to prevent an increase in transmission delay due to an excessive increase in the number of retransmissions. It is another object of the present invention to provide a transmitting apparatus and a transmitting method capable of performing the above.
- This object is achieved by increasing the length of the GI as the number of retransmissions increases, or by setting the length of the GI in consideration of delay dispersion information, a transmission time interval, or a used bandwidth. Further, this object is achieved by increasing only the length of the GI of the systematic bits output by turbo coding when the number of retransmissions increases.
- the purpose is to increase the number of subcarriers in which the same signal is allocated as the number of retransmissions increases, or the number of subcarriers in which the same signal is allocated in consideration of line quality information, transmission time interval, or used bandwidth, etc.
- FIG. 1 is a block diagram showing a configuration of a transmitting apparatus according to Embodiment 1 of the present invention
- FIG. 2 is a diagram showing a signal arrangement of an OFDM-CDMA communication system
- FIG. 3 is a flowchart showing the operation of the transmitting apparatus according to Embodiment 1 of the present invention
- FIG. 4 is a diagram of a transmission signal with GI inserted
- Figure 5 is a diagram of the transmitted signal with GI inserted
- Figure 6 is a diagram of the transmitted signal with GI inserted
- FIG. 7 is a block diagram illustrating a configuration of a transmitting apparatus according to Embodiment 2 of the present invention
- FIG. 8 is a flowchart illustrating an operation of the transmitting apparatus according to Embodiment 2 of the present invention
- FIG. FIG. 10 is a block diagram illustrating a configuration of a delay variance information generation unit
- FIG. 10 is a block diagram illustrating a configuration of a transmission apparatus according to Embodiment 3.
- FIG. 11 is a flowchart showing the operation of the transmitting apparatus according to Embodiment 3 of the present invention
- FIG. 12 is a block diagram showing the configuration of the transmitting apparatus according to Embodiment 4 of the present invention
- FIG. FIG. 14 is a flowchart showing the operation of the transmitting apparatus according to Embodiment 4 of the present invention.
- FIG. 14 is a block diagram showing the configuration of the transmitting apparatus according to Embodiment 5 of the present invention.
- FIG. 15 is a flowchart showing the operation of the transmitting apparatus according to Embodiment 5 of the present invention
- FIG. 16 is a block diagram showing the configuration of the transmitting apparatus according to Embodiment 1 of the present invention
- FIG. 18 is a diagram showing rearrangement of transmission signals
- FIG. 19 is a diagram showing rearrangement of transmission signals.
- FIG. 20 is a diagram showing rearrangement of transmission signals
- Figure 21 shows the assignment of signals to subcarriers
- Figure 22 shows the assignment of signals to subcarriers
- FIG. 23 shows the assignment of signals to subcarriers.
- FIG. 24 is a block diagram showing the configuration of the transmitting apparatus according to Embodiment 2 of the present invention
- FIG. 25 is a flowchart showing the operation of the transmitting apparatus according to Embodiment 2 of the present invention
- FIG. FIG. 27 is a block diagram illustrating a configuration of a transmitting apparatus according to Embodiment 3 of the present invention.
- FIG. 27 is a flowchart illustrating an operation of the transmitting apparatus according to Embodiment 3 of the present invention.
- FIG. FIG. 29 is a block diagram illustrating a configuration of a transmitting apparatus according to Embodiment 4
- FIG. 29 is a flowchart illustrating an operation of the transmitting apparatus according to Embodiment 4 of the present invention
- FIG. 30 is an embodiment of the present invention.
- FIG. 31 is a block diagram showing the configuration of the transmitting apparatus according to Embodiment 5
- FIG. 31 is a flowchart showing the operation of the transmitting apparatus according to Embodiment 5 of the present invention,
- FIG. 32 is a block diagram showing the configuration of the transmitting apparatus according to Embodiment 6 of the present invention.
- FIG. 1 is a diagram showing a part of the configuration of a transmitting apparatus according to Embodiment 1 of the present invention ( transmitting apparatus 100 includes control section 101, spreading section 102, and IFFT section 103. , GI insertion section 104, GI insertion section 105, GI insertion section 106, selection section 107, and It is mainly composed of Tena 108.
- Control section 101 temporarily stores the transmission signal modulated by a modulation section (not shown), and outputs the transmission signal to spreading section 102 when the transmission timing comes.
- the control unit 101 since there are two types of transmission signals, a normal transmission signal that is not a retransmission signal and a retransmission signal, the control unit 101 separates the transmission signal into a retransmission signal and other normal signals, and In the case of retransmission, the number of retransmissions is determined, and retransmission information is output to selecting section 107.
- the retransmission information includes information on whether or not retransmission is performed and information on the number of retransmissions.
- Spreading section 102 spreads the transmission signal input from control section 101 using different spreading codes, generates a CDMA signal by code division multiplexing, and outputs the CDMA signal to IFFT section 103.
- spreading section 102 may output the transmission signal to IFFT section 103 without spreading the transmission signal as spreading factor 1.
- the signal subjected to the IFFT processing in IFFT section 103 is an OFDM signal.
- IFFT section 103 which is an orthogonal frequency division multiplexing means, performs IFFT processing on the transmission signal input from spreading section 102, generates an OFDM-CDMA signal, and outputs it to GI input sections 104, 105, and 106. As shown in FIG.
- a QFDM-CDMA signal can be generated by assigning one type of spreading code to one subcarrier.
- Figure 2 shows the case where all subcarriers are divided into four groups, G1 to G4.
- the OFDM-CDMA signal generated by IFFT section 103 can select any number of code multiplexes, such as 1 code multiplex.
- the code multiplexing number is the number of multiplexing for each carrier, and is determined by the number of users (how many codes) to multiplex. Therefore, when the code multiplex number is 1, only one user is assigned to one subcarrier.
- GI insertion section 104 inserts the GI into the transmission signal input from IFFT section 103, and inserts the GI into the transmission signal before outputting to selection section 107.
- the length of the GI to be inserted at the GI input section 104 is shorter than the GI input section 105 and the GI insertion section 106.
- GI input section 105 inserts GI into the transmission signal input from IFFT section 103, inserts GI into the transmission signal, and outputs the result to selection section 107.
- the length of the GI inserted at the GI input section 105 is longer than the length of the GI inserted at the GI input section 104 and shorter than the length of the GI inserted at the GI insertion section 106.
- GI insertion section 105 sets the length of the GI to be inserted into the transmission signal longer than the length of the GI inserted by GI insertion section 104 and shorter than the length of the GI inserted by GI insertion section 106.
- the GI input unit 104 may insert a GI having a length that is an integral multiple of the length of the GI to be inserted.
- GI input section 106 inserts GI into the transmission signal input from IFFT section 103, inserts GI into the transmission signal, and outputs the signal to selection section 107.
- the length of the GI inserted at the GI insertion part 106 is longer than the GI insertion part 104 and the GI insertion part 105.
- GI insertion section 106 can arbitrarily set the length of the GI to be inserted into the transmission signal as long as it is longer than the length of the GI inserted by GI insertion section 104 and GI input section 105.
- a GI having a length that is an integral multiple of the length of the GI input at 104 may be inserted.
- the selection unit 107 which is a control unit, selects a GI input unit 104, a GI insertion unit 105, and a GI input unit 106 from the transmission signal in which the GI input from the GI insertion unit 106 is inserted, based on the information on the number of retransmissions input from the control unit 101. Select one and transmit the selected transmission signal from antenna 108.
- the transmission signal selection based on the information on the number of retransmissions, the transmission signal input from the GI insertion unit 104 is selected in the case of transmission other than retransmission, and input from the GI input unit 105 in the case of the first retransmission.
- the transmission signal is selected, and in the case of the second retransmission, the transmission signal input from GI insertion section 106 is selected.
- control unit 101 determines whether the transmission signal is a retransmission signal or another normal signal (step (hereinafter referred to as “ST”) 301). Further, if the transmission signal is a retransmission signal, control section 101 determines whether or not it is the first retransmission. Separated (ST 302). Then, control section 101 outputs retransmission information including information on whether or not the signal is a retransmission signal and information on the number of retransmissions to selection section 107.
- step (hereinafter referred to as “ST”) 301) determines whether or not it is the first retransmission. Separated (ST 302). Then, control section 101 outputs retransmission information including information on whether or not the signal is a retransmission signal and information on the number of retransmissions to selection section 107.
- the OFDM—CDMA signal that has been subjected to spreading processing in spreading section 102 and IFFT processing in IFFT section 103 is subjected to GI input section 104, GI input section 105 and GI insertion section 106 to perform GI Will be introduced.
- the length of the GI to be inserted in the GI insertion section 105 and the GI insertion section 106 is an integral multiple of the GI length inserted in the GI insertion section 104
- the GI insertion section 104 The signal waveform of the GI to be inserted can be inserted repeatedly a certain number of times, which makes the process of inserting the GI easier and makes the GI length longer than the integral multiple of the length of the frame.
- the transmission signal into which the GI has been inserted in the GI input section 104 includes a GI length T g1 that is 8 of the effective symbol length T s1.
- the transmission signal into which GI has been inserted by GI insertion section 105 includes GI length Tg2, which is a quarter of effective symbol length Ts2.
- the transmission signal into which GI is inserted by GI insertion section 106 contains GI length Tg3, which is three-eighths of effective symbol length Ts3.
- the selection unit 107 selects a transmission signal input from the GI insertion units 104, 105, and 106 based on the retransmission information transmitted from the control unit 101. That is, if the transmission signal to be transmitted is not a retransmission signal, as shown in FIG. 4, the GI length Tg 1 that is 1/8 of the effective symbol length T s 1 input from the GI input section 104 is calculated. Select the input transmission signal (ST303).
- the selection unit 107 determines the effective symbol length T s input from the GI input unit 105 as shown in FIG.
- the transmission signal into which the GI length T g 2 of a quarter length of 2 has been inserted is selected (ST 304), and in the case of the second retransmission, as shown in FIG.
- the GI length T g 3 that is 3/8 of the effective symbol length T s 3 input from 6 is ⁇ Select incoming signal (ST 305) o
- selecting section 107 outputs the selected transmission signal (ST 306).
- the length of the GI increases as the number of retransmissions increases. Note that the GI length is Tgl> Tg2> Tg3, and the GI is set longer in the order of FIG. 4, FIG. 5, and FIG.
- the selection unit selects a transmission signal having a longer GI inserted as the number of retransmissions increases, based on the retransmission information input from the control unit. Therefore, the transmission delay can be prevented from increasing due to an excessive increase in the number of retransmissions without substantially reducing the transmission efficiency. Also, by increasing the length of GI as the number of retransmissions increases, the delay time becomes shorter than the GI length, so that intersymbol interference in a multipath environment can be reduced.
- FIG. 7 is a diagram showing a configuration of transmitting apparatus 700 according to Embodiment 2 of the present invention.
- the present embodiment is characterized in that the GI length is set for each of the systematic bit data and the parity bit data.
- This embodiment is different from FIG. 1 in that the configuration in which an evening encoding unit 701, a parallel Z-serial (hereinafter referred to as “P / Sj”) conversion unit 702, and a modulation unit 703 are provided in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
- P / Sj parallel Z-serial
- a turbo code When a turbo code is used as an error correction code, a systematic bit data and a parity bit data are output, but better quality is required for the systematic bit data. Accordingly, by making the length of the GI of the systematic bit data longer than the length of the GI of the parity bit data, it is possible to further achieve both the transmission efficiency and the error rate.
- the control unit 101 temporarily stores the transmission signal and sorts the transmission signal into retransmission information and other normal information. Then, when it is time to send, The retransmission signal is output to spreading section 102 and retransmission information is output to selection section 107.
- the retransmission information includes information on the number of retransmissions. Further, the control unit 101 performs transmission timing at which the systematic bit data and the parity bit data are output, and determines whether the transmission signal is a systematic bit data or a parity bit data. Information on whether there is any is output to the selection unit 107.
- the evening code encoder 701 outputs a part of the transmission signal input from the controller 101 as a systematic bit data to the P / S converter 702 without encoding it. At the same time, recursive convolution coding is performed on the remaining part of the input transmission signal, and the result is output to the P / S conversion unit 702 as a parity bit data.
- the PZS converter 702 which is an arrangement means, converts the systematic bit data and parity bit data input from the evening encoding unit 701 from parallel data format to serial data format. And outputs the result to the modulator 703.
- the systematic bit data and parity bit data converted by the PZS converter 702 are all composed of systematic bits or parity bits for each symbol.
- the modulator 703 serving as an arrangement unit modulates the systematic bit or parity bit of each symbol input from the PZS converter 702 and outputs the modulated symbol or parity to the spreading unit 102.
- the GI input sections 104, 105, and 106 independently input GI for the systematic bit data and parity bit data.
- the length of the GI inserted in the parity bit data may be shorter than the length of the GI inserted in the systematic bit data, and the length of the GI inserted in the parity bit data may be reduced. Regardless of the number of retransmissions, the length of the GI for systematic bit data may be made longer as the number of retransmissions increases.
- the selection unit 107 includes information on the number of retransmissions input from the control unit 101 and whether the transmission signal is systematic bit data or parity bit data.
- GI insertion section 104, GI insertion section 105, and GI insertion section 106 selects one of the transmission signals into which GI has been inserted, and transmits the selected transmission signal from antenna 108. That is, for systematic bit data, the length of the GI increases as the number of retransmissions increases, and for parity bit data, the length of the GI does not change even if the number of retransmissions increases. Control.
- Control section 101 determines whether or not the transmission signal is systematic bit data (ST801), and outputs information as to whether or not the transmission signal is systematic bit data to selection section 107. . Further, if it is systematic bit data transmission, control section 101 determines whether or not retransmission is performed (ST 802), and if it is retransmission, determines whether or not the number of retransmissions is the first time (ST 803). If the transmission signal is a retransmission signal and if the transmission signal is a retransmission signal, retransmission information including information on the number of retransmissions is output to selection section 107.
- the selecting unit 107 determines whether the transmission signal is not the systematic bit data but the parity bit data, As shown in (1), the transmission signal into which the GI length Tg1 of 1/8 of the effective symbol length Ts1 input from the GI insertion section 104 is inserted is selected (ST804).
- the GI length Tg1 of the data bit is fixed to one-eighth of the effective symbol length Ts1, so that it can be used in the transmission signal of the systematic bit data where good quality is required. If only the length of the GI is changed, the error rate characteristics can be improved without lowering the transmission efficiency, and both the transmission efficiency and the error rate characteristics can be achieved.
- the selection unit 107 determines whether the transmission signal is systematic bit data and the transmission signal is not retransmission. As shown in the figure, the transmission signal inserted with the GI length Tg 1 that is 1/8 of the effective symbol length Ts 1 input from the GI input section 104 Select (ST804).
- the selection unit 107 determines the effective symbol length T input from the GI input unit 105 as shown in FIG. A transmission signal into which a GI length T g 2 of a quarter of s 2 has been inserted is selected (ST805), and for the second retransmission, as shown in FIG. Enter 1
- the transmission signal into which the GI length Tg3 of 3/8 of the effective symbol length Ts3 input from 06 has been inserted is selected (ST806).
- the selector 107 outputs a transmission signal (ST807).
- a one-time encoding unit that can obtain a very good error rate characteristic as compared with other error correction methods is provided.
- the transmission signal is encoded by a one-time code, and the selection unit outputs the systematic bit data.
- the length of the GI inserted into the systematic bit data at the time of retransmission is longer than the length of the GI inserted into the parity bit data at the time of retransmission.
- the length of the GI inserted into the systematic bit data at the time of retransmission may be the same as the length of the GI inserted into the knowledge bit data.
- FIG. 9 is a diagram showing a configuration of transmitting apparatus 900 according to Embodiment 3 of the present invention.
- the present embodiment is characterized in that the length of GI is selected in consideration of delay dispersion information.
- This embodiment is different from FIG. 1 in the configuration of FIG. 9 in which an evening encoding unit 901 and a P / S conversion unit 902 are provided. Parts having the same configuration as in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
- the length of the GI can generally be determined by the delay spread. Therefore, if the length of the GI is determined by reflecting the delay dispersion information, it is possible to further achieve both the transmission efficiency and the error rate.
- the control unit 101 temporarily stores the transmission signal, and sorts the transmission signal into retransmission information and other normal information. Then, when the transmission timing comes, the transmission signal is output to spreading section 102 and retransmission information is output to selection section 107.
- the retransmission information includes information on the number of retransmissions. Further, control section 101 outputs the delay dispersion information to selection section 107. Since the delay dispersion information is included in the transmission signal from the communication partner and notified, the delay dispersion information is extracted from the reception signal. The configuration of the delay dispersion generator on the communication partner side will be described later.
- Evening encoder 901 outputs a part of the transmission signal input from control unit 101 to P / S conversion unit 902 as systematic bit data without encoding it. At the same time, the remaining part of the input transmission signal is subjected to recursive convolutional coding, and is output to the PZS converter 02 as parity bit data.
- the P / S converter 902 converts the systematic bit data and parity bit data input from the evening encoder unit 901 from a parallel data format to a serial data format. Output to modulation section 903.
- the selection unit 107 receives the GI input from the GI input unit 104, the GI input unit 105, and the GI input unit 106 based on the number of retransmissions and the delay dispersion information input from the control unit 101. One is selected from the transmission signals into which is inserted, and the selected transmission signal is transmitted from the antenna 108. That is, if the delay dispersion is small even at the time of the second retransmission, the transmission signal input from GI insertion section 105 is selected.
- the delay variance generation unit 1000 mainly includes a delay circuit 1001, a subtraction circuit 1002, an absolute value circuit 1003, and an averaging circuit 1004.
- the delay circuit 1001 receives the signal after the FFT processing of the preamble of the received signal, delays the input signal, and outputs it to the subtraction circuit 1002.
- the subtraction circuit 1002 calculates the difference between the signal levels of adjacent subcarriers and outputs the difference to the absolute value conversion circuit 1003.
- the absolute value conversion circuit 1 0 3 calculates the subtraction result input from the subtraction circuit 1 0 2 into an absolute value. And outputs the result to the averaging circuit 1004.
- the averaging circuit 1004 averages the absolute value of the reception level difference input from the absolute value circuit 1003 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 FIG. 10 using the received signal. Detecting delay dispersion from a received signal is possible in the TDD communication system or the like.
- Control section 101 determines whether or not the transmission signal is a retransmission (ST 1101). If it is a retransmission, control section 101 determines whether or not the number of retransmissions is the first time (ST 1102). If the signal is a retransmission signal, retransmission information including information on the number of retransmissions is output to selection section 107. Further, control section 101 outputs delay dispersion information notified from the communication partner included in the received signal to selection section 107.
- selection section 107 has a GI length that is one-eighth of effective symbol length T s 1 as shown in FIG.
- the transmission signal with Tg1 inserted is selected (ST 1103).
- selecting section 107 performs a GI length Tg2, which is a quarter of effective symbol length Ts2, as shown in FIG. Is selected (ST 1104), and if it is the second retransmission, it is determined whether or not the delay dispersion is smaller than the threshold value from the delay dispersion information input from control section 101 (ST 1104). 1105).
- selection section 107 transmits the GI length Tg 2 having a length equal to a quarter of effective symbol length Ts 2 as shown in FIG. Select the signal (ST 1104) and if the delay spread is above the threshold,
- a transmission signal into which a GI length Tg 3 of 3/8 of the effective symbol length Ts 3 is inserted is selected (ST 1106).
- selection section 107 outputs a transmission signal in which the length of the selected GI is inserted (ST 1107).
- the selecting unit selects a transmission signal including a GI having a length in consideration of the delay dispersion information. If it is not necessary to increase the length of the GI even if the number of transmissions increases, the transmission efficiency can be increased as much as possible without selecting a transmission signal having a GI longer than necessary.
- the magnitude of the delay dispersion is determined at the time of the second retransmission.However, the present invention is not limited to this, and the magnitude of the delay dispersion may be determined at the time of the first retransmission. good.
- FIG. 12 is a diagram showing a configuration of transmitting apparatus 1200 according to Embodiment 4 of the present invention.
- the present embodiment is characterized in that the GI length is selected in consideration of the transmission time interval.
- the present embodiment is different from FIG. 1 in the configuration in FIG. 12 in which a counter section 1201, a delay section 122, and a subtraction section 1203 are provided. Parts having the same configuration as in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
- CSMA Carrier Sence Multiple Access
- the time interval between the previous transmission and the current transmission is very short. May be longer. In such a case, if the second or third retransmission fails, the transmission delay may become extremely large. In order to avoid such a situation, it is also effective to select the GI length in consideration of the transmission time interval from the previous transmission to the current transmission.
- the CSMA is transmitted when the terminal performs carrier sense and the reception level is equal to or lower than the threshold.
- the counting unit 1201 generates information indicating the transmission timing based on the transmission timing input from the control unit 101, and outputs the information to the delay unit 122 and the subtraction unit 1203.
- the delay section 1222 delays the information indicating the transmission timing input from the count section 1201 and outputs the information to the subtraction section 1203.
- the subtraction unit 1203 uses the information indicating the transmission timing input from the counter unit 1201 and the information indicating the transmission timing input from the delay unit 122 to determine the last transmission timing and the current transmission. The difference from the timing is calculated, and the calculated transmission timing difference is output to the selection unit 107 as a transmission time interval.
- the selection unit 107 includes a GI insertion unit 104 and a GI input unit 1 based on the information on the number of retransmissions input from the control unit 101 and the information indicating the transmission time interval input from the subtraction unit 123. 05 and the GI input unit 106 selects one of the transmission signals into which the GI has been inserted, and transmits the selected transmission signal from the antenna 108. That is, if the transmission time interval is large even in the case of the first retransmission, the transmission signal input from the GI input unit 106 having the largest GI length among the three types of GI lengths is selected. .
- the control unit 101 determines whether or not the transmission signal is a retransmission (ST 1301), and if it is a retransmission, determines whether or not the number of retransmissions is the first time (ST 13 02). If the signal is a retransmission signal and if the signal is a retransmission signal, retransmission information including information on the number of retransmissions is output to selection section 107. Also, the subtraction unit 1203 outputs information indicating the calculated transmission time interval to the selection unit 107.
- selecting section 107 has a length of one-eighth of effective symbol length T s1.
- GI length T g 1 is inserted and the transmission signal is selected (ST 13 03)
- selecting section 107 determines whether or not the transmission time interval is equal to or greater than a threshold value for the first retransmission (ST 1310). 4) In the case of the second retransmission, as shown in FIG. 6, a transmission signal in which a GI length T g 2 of 3/8 of the effective symbol length T s 2 is selected (ST 1 3 0 6) Further, if the transmission time interval is smaller than the threshold value based on the information indicating the transmission time interval input from the control unit 101, the selection unit 107 sets the effective symbol length T s as shown in FIG.
- a transmission signal in which a GI length T g 2 of a quarter length of 2 has been inserted is selected (ST 13 05), and if the transmission time interval is equal to or greater than the threshold, as shown in FIG. , Select a transmission signal into which a GI length T g3 of 3/8 of the effective symbol length T s 3 has been inserted (ST 13 06)
- the selector 107 outputs a transmission signal in which the selected GI length is inserted (ST 1307).
- the selecting unit selects a transmission signal including a GI having a length in consideration of the transmission time interval. If the interval is long, retransmission is repeated many times, thereby preventing the transmission delay from becoming extremely large.
- the size of the transmission time interval is compared at the time of the first retransmission, but the present invention is not limited to this, and the size of the transmission time interval is compared at the time of non-retransmission. May be.
- FIG. 14 is a diagram showing the configuration of transmitting apparatus 140 according to Embodiment 5 of the present invention.
- the present embodiment is characterized in that the GI length is set in consideration of the band usage.
- the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
- the control unit 101 sets the remaining bandwidth to be more than the currently used bandwidth if the communication partner notifies the usage status information of the bandwidth or if the allowable bandwidth is known as the available bandwidth. Since it is possible to know how much room there is in this band, information on the ratio of the used band to the allowable used band is output to the selection unit 107.
- the selection unit 107 includes a GI insertion unit 104, a GI insertion unit 105, and a G insertion unit based on the information on the number of retransmissions input from the control unit 101 and the information indicating the use state of the band. o
- One of the transmission signals into which the GI input from input section 106 has been inserted is selected, and the selected transmission signal is transmitted from antenna 108. That is, if there is room in the band even in the case of the first retransmission, the transmission signal input from GI input section 106 having the largest GI length among the three types of GI lengths is selected.
- Control section 101 determines whether or not the transmission signal is retransmission (ST 1501), and if retransmission, determines whether or not the number of retransmissions is the first time (ST 1502), and determines whether or not the transmission signal is retransmission. If it is information and a retransmission signal, retransmission information including information on the number of retransmissions is output to selection section 107. Further, control section 101 outputs information indicating the usage status of the band at each communication partner to selection section 107.
- selecting section 1 ⁇ 7 has a length of one-eighth of effective symbol length T s 1 as shown in FIG. Select transmission signal with GI length Tg 1 inserted (ST 1503) o
- selecting section 107 determines whether the ratio of the used band to the allowable used band is equal to or smaller than the threshold value for the first retransmission. (ST1504), and in the case of the second retransmission, as shown in FIG. 6, the transmission signal into which the GI length Tg3 of 3/8 of the effective symbol length Ts3 is inserted is used. Select (ST 1506).
- the selecting section 107 determines, as shown in FIG. 5, a GI length T g of a quarter of the effective symbol length T s 2. 2 is selected (ST 1505), and when the ratio of the used band to the allowable used band is equal to or less than the threshold, as shown in FIG. 6, the effective symbol length Ts 3 A transmission signal in which a GI length Tg3 of 3/8 length is selected is selected (ST 1506).
- selecting section 107 selects a transmission signal in which the GI according to the used band is inserted, the GI can be lengthened without lowering the transmission efficiency when there is a margin in the used band. , The number of retransmissions can be reduced, and the transmission delay can be reduced. If there is not enough available bandwidth, control is performed so that the GI does not become unnecessarily long, so that a reduction in transmission efficiency can be prevented.
- the selection unit 107 outputs a transmission signal in which the selected GI length is inserted (ST1507).
- the selection unit selects the transmission signal in which the GI according to the band usage is inserted, so that the transmission efficiency is improved. Can be prevented without reducing transmission delay.
- the ratio of the used bandwidth to the allowable used bandwidth is determined.
- the present invention is not limited to this. You may make it determine the ratio of a band.
- FIG. 16 is a diagram showing a part of the configuration of the transmitting apparatus according to Embodiment 6 of the present invention.
- the transmitting device 1600 includes a control unit 1601, a spreading unit 1602, a serial Z parallel (hereinafter referred to as “SZP”) conversion unit 1603, a PZS conversion unit 1604, It is mainly composed of IFFT section 165, GI insertion section 166 and antenna 167.
- SZP serial Z parallel
- the control unit 1601 which is a control unit, temporarily stores the transmission signal modulated by the modulation unit (not shown) and selects the transmission signal into retransmission information and other normal information. Then, when the transmission timing comes, the transmission signal is output to spreading section 1602, and the retransmission information is output to SZP conversion section 1603 and PZS conversion section 1604.
- the retransmission information includes the number of retransmissions and information on retransmission.
- the spreading section 1602 spreads the transmission signal input from the control section 1601 using different spreading codes, generates a CDMA signal by code division multiplexing, and generates an SZP conversion section 1 Output to 63.
- the spreading section 1602 may output the transmission signal to the IFFT section 103 without spreading the transmission signal as the spreading factor 1.
- the signal processed by IFFT section 103 is an OFDM signal.
- the S / P conversion unit 1603 which is a rearranging unit, converts the transmission signal input from the spreading unit 1602 from the serial data Convert to data format and output to P / S converter 1604.
- SZP conversion section 1603 converts the transmission signal into a parallel data format and stores it in memory, and retransmits the data to be retransmitted included in the retransmission information. The data is read from the memory by the number corresponding to the number of transmissions and output to the PZS conversion unit 1604.
- the PZS conversion unit 1604 which is a rearrangement unit, converts the transmission signal input from the S / P conversion unit 1603 from the parallel data format to the serial data format as it is, and sends it to the IFFT unit 1605. Output.
- PS conversion section 1604 rearranges the transmission signal including retransmission data input from SZP conversion section 1603 based on the retransmission information input from control section 1601, and performs rearranged transmission. The signal is output to IF FT section 1605. The method of rearranging the transmission signals will be described later.
- IFFT section 1605 which is orthogonal frequency division multiplexing means, performs orthogonal frequency division multiplexing such as IFFT on the transmission signal input from PZS conversion section 1604, generates an OFDM-CDMA signal, and outputs it to GI input section 1606.
- OFDM—CDMA signals can be generated by assigning one type of spreading code to one subcarrier.
- the OFDM-CDMA signal generated by IFFT section 103 can select any number of code multiplexes, such as 1 code multiplex.
- the code multiplexing number is the number of multiplexing for each carrier, and is determined by the number of users (how many codes) to multiplex. Therefore, when the code multiplex number is 1, only one user is assigned to one subcarrier.
- GI input section 1606 inserts a predetermined GI into the transmission signal input from IFFT section 1605, and transmits the signal from antenna 1607.
- GI insertion part 1606 A radio unit (not shown) is provided between the antenna and the antenna 1607. The radio unit performs processing such as up-conversion from a baseband frequency to a radio frequency.
- FIG. 17 is a flowchart showing the operation of the transmitting apparatus 160.
- FIGS. 18 to 20 show transmission signals using the SZP conversion section 1603 and the PZS conversion section 1604.
- FIG. 9 is a diagram showing a method of rearranging the symbols.
- control unit 1601 determines whether the transmission signal modulated and input by the modulation unit (not shown) is a normal signal that is not a retransmission signal or a retransmission signal (ST 1701). 1), if it is a retransmission, it is determined whether or not it is the first retransmission (ST1772).
- the control unit 1601 includes information on whether the signal is a normal signal or a retransmission signal (hereinafter, referred to as “signal type information”), information on the number of retransmissions (hereinafter, referred to as “number information”), and Retransmission information consisting of information on which signal the communication partner requests retransmission (hereinafter, referred to as “request information”) is output to SP conversion section 1603 and PZS conversion section 1604.
- signal type information information on whether the signal is a normal signal or a retransmission signal
- number information information on the number of retransmissions
- request information Retransmission information consisting of information on which signal the communication partner requests retransmission
- the transmission signal subjected to spreading processing in spreading section 1602 is converted into serial data format data in SZP conversion section 1603 as shown in FIG. Evening sequence "$ 1, $ 2, $ 3, $ 4" is converted to parallel data format and stored temporarily in memory 1801. Signals $ 1 to $ 4 are code division multiplexed signals.
- the signals $ 1, $ from the top of FIG. 18 are not rearranged by the PZS conversion ⁇ 1664.
- IB columns are stored in the memory 1802 in the order of 2, $ 3, and $ 4, and then read sequentially from the top in Fig. 18 and converted to a serial data format.
- the transmission signal output from the PZS converter 164 is arranged as a data string "$ 1, $ 2, $ 3, $ 4" in the serial data format (ST1703).
- the SZP conversion unit 1603 converts the data sequence "$ 1, $ 2, $ 3, $ 4" in the serial data format into a parallel data format and temporarily stores it in the memory 1801. Then, based on the signal type information, number-of-times information, and request information input from the control unit 1601, the signal $ 1 is read twice from the memory 1801 because it is the first retransmission and the retransmission request is made for the signal $ 1. At the same time, signals $ 2 and $ 3 are read once and output to PZS converter 1604.
- the transmission signal output from the S / P conversion unit 1603 is stored in the memory 1802 of the P / S conversion unit 1604 in the form of signals $ 1, $ 2, $ 1, $ 3 from the top of FIG. They are arranged in order, and then read sequentially from the top in FIG. 19 and converted into a serial data format.
- the transmission signals output from the PZS converter 1604 are arranged in a serial data format "$ 1, $ 2, $ 1, $ 3" (ST 1705).
- ST 1705 serial data format
- the transmission signal subjected to spreading processing in spreading section 1602 is converted into serial data overnight data stream “$ 1, $ 2” in SZP conversion section 1603 as shown in FIG. , $ 3, $ 4 "is converted to a parallel data format and stored temporarily in the memory 1801. Then, based on the signal type information, number-of-times information, and request information input from control section 1601, it is the second retransmission and retransmission request for signal $ 1, so only signal $ 1 from memory 1801 is transmitted. It is read once and output to the PZS converter 1604.
- the transmission signal output from the S / P converter 1603 is stored in the memory 1802 of the PZS converter 1604 in the order of signals $ 1, $ 1, $ 1, $ 1 from the top of FIG. Then, the data is sequentially read from the top of FIG. 20 and converted into a serial data format. Output from PZS converter 1604 The transmitted signals are arranged in a serial data format "$ 1, $ 1, $ 1, $ 1" (ST 1704).
- the transmission signal is subjected to orthogonal frequency division multiplexing such as IFFT processing in IFFT section 1605 to obtain an OFDM-CDMA signal (ST 1706).
- orthogonal frequency division multiplexing such as IFFT processing in IFFT section 1605 to obtain an OFDM-CDMA signal (ST 1706).
- OFDM—CDMA signals have a spreading ratio of one quarter of the number of subcarriers and divide all subcarriers into four subcarrier groups. That is, the OFDM-CDMA signal is composed of a first group G1 composed of subcarrier # 3 m + 1 to subcarrier # 4m, a second group G2 composed of subcarrier # 2m + 1 to subcarrier # 3m, It is divided into a third group G3 consisting of subcarrier # m + 1 to subcarrier # 2m and a fourth group G4 consisting of subcarrier # 1 to subcarrier # m.Each subcarrier group has The code division multiplexed signal is allocated separately.
- signal $ 1 is allocated to each subcarrier of the first group G1 and signal $ 2 is allocated to each subcarrier of the second group G2, as shown in Fig. 21.
- the signal $ 3 is allocated to each subcarrier of the third group G3, and the signal $ 4 is allocated to each subcarrier of the fourth group G4.
- the signal $ 1 is allocated to each subcarrier of the first group G1, and is allocated to the third group G3.
- the signal $ 1 is allocated to each subcarrier and allocated
- the signal $ 2 is allocated to the second group G2
- the signal $ 3 is allocated to the fourth group G4. Therefore, at the time of the first retransmission, the number of subcarriers is twice as much as the signal $ 1 assigned to each subcarrier of the third group G3 as compared with the time of normal transmission.
- the signal $ 1 is allocated to each subcarrier of the second group G2, the third group G3, and the fourth group G4 in the same manner as in the first group. Placed. Therefore, at the time of the second retransmission, compared to the time of the first retransmission, only the signal $ 1 is allocated to each subcarrier of the second group G3 and each subcarrier of the fourth group G4. The number of subcarriers doubles.
- the number of subcarriers to which retransmission signals are allocated is increased, whereby a frequency diversity effect can be obtained, and the error rate characteristics can be improved.
- the number of subcarriers to which retransmission signals are allocated is increased by an integral multiple of 2, so that the frequency can be reduced by half at the time of clock division, and clock generation is easy. At the same time, it is only necessary to add two bits at the time of reception, so it is easy to combine received signals.
- the SZP conversion section generates a retransmission signal based on the retransmission information received from the control section, and the PZS conversion section rearranges the transmission signals including the generated retransmission signal.
- the IFFT section performs orthogonal frequency division multiplexing of the transmission signal, so the number of subcarriers to which retransmission signals are allocated increases as the number of retransmissions increases, and transmission delay increases due to an excessive increase in the number of retransmissions. Can be prevented.
- FIG. 24 is a diagram showing the configuration of transmitting apparatus 240 0 according to Embodiment 7 of the present invention.
- the seventh embodiment is characterized in that each of a systematic bit data and a parity bit data is allocated to a subcarrier.
- Embodiment 7 is different from FIG. 16 in that, in FIG. 24, the configuration in which an evening-both encoding unit 2401 and a parallel / serial (hereinafter referred to as “PZS”) conversion unit 2402 are provided. Different. Portions having the same configuration as in FIG. 16 are denoted by the same reference numerals, and description thereof is omitted.
- the one-bit code When the one-bit code is used as the error correction code, the systematic bit Evening and parity bit data are output, but better quality is required for systematic bit data. Therefore, by making the number of subcarriers to which the systematic bit data is allocated larger than the number of the subcarriers to which the parity bit data is allocated, it is possible to further achieve both the transmission efficiency and the error rate.
- the control unit 1601 temporarily stores the transmission signal and sorts the transmission signal into retransmission information and other normal information.
- the transmission signal is output to spreading section 1602, and the retransmission information is output to SZP conversion section 1603 and PZS conversion section 1604.
- the retransmission information consists of only signal type information during normal transmission, and consists of signal type information, frequency information and request information at the time of retransmission.
- the $ control section 1601 controls the transmission timing at which the systematic bit data and the parity bit data are output, and determines whether the transmission signal is systematic bit data or parity bit data. Information on whether it is evening is output to the S / P converter 1603 and the PZS converter 1604.
- the encoding unit 2401 is a P / S conversion unit 2404 as systematic bit data without encoding a part of the transmission signal input from the control unit 1601. 2 and performs recursive convolutional coding on the remaining part of the input transmission signal, and outputs the result to the PZS conversion section 2402 as parity bit data.
- the PZS converter 2402 converts the systematic bit data and the parity bit data input from the receiver encoding unit 2401 from the parallel data format to the serial data format and spreads them. Output to section 1602.
- the systematic bit data and the parity bit data are assigned to different symbols.
- FIG. 160 is a flowchart showing the operation of transmitting apparatus 240.
- the control section 1601 determines whether or not the transmission signal is parity bit data (ST2501), and further determines whether or not the transmission signal is a retransmission signal (ST2501). T2502), if it is a retransmission, it is determined whether or not it is the first retransmission (ST2504). Then, control section 1601 obtains information on whether the transmission signal is systematic bit data or parity bit data (hereinafter referred to as “bit information”), signal type information, frequency information, and request information. This retransmission information is output to SZ ⁇ conversion section 1603 and PZS conversion section 1604.
- bit information systematic bit data or parity bit data
- the transmission signal subjected to spreading processing in spreading section 1602 is converted into serial data overnight parity bit data string "$ 1" in SZP conversion section 1603, as shown in FIG. , $ 2, $ 3, $ 4 "to the parallel data format and temporarily stored in the memory 1801.
- the PZS conversion section 1604 Since the transmission signal output from the SZP conversion section 1603 is at the time of normal transmission, the PZS conversion section 1604 does not rearrange the signals, and the parity bit data signals $ 1, $ 2, The data is arranged in the memory 1802 in the order of $ 3 and $ 4, and is sequentially read from the top of FIG. 18 and converted into the serial data format.
- the transmission signals output from the PZS conversion section 1604 are arranged as a parity bit data sequence “$ 1, $ 2, $ 3, $ 4” in a serial data format (S ⁇ 2503).
- the transmission signal spread by the spreading section 1602 is, as shown in FIG.
- the conversion unit 1603 converts the systematic bit data sequence "$ 1, $ 2, $ 3, $ 4" in the serial data format into the parallel data format and temporarily stores it in the memory 1801.
- the transmission signal output from S / P conversion section 1603 Since the transmission signal output from S / P conversion section 1603 is at the time of normal transmission, the signals of systematic bit data $ 1, $ 2, They are arranged in the memory 1802 in the order of $ 3, $ 4, and are sequentially read from the top of FIG. 18 and converted into the serial data format.
- the transmission signal output from the PZS converter 1604 is a serialized overnight systematic bit data string "$ 1, $ 2, $ 3, $ 4" (ST 2503).
- the transmission signal subjected to spreading processing in spreading section 1602 is, as shown in FIG.
- the parity bit data sequence "$ 1, $ 2, $ 3, $ 4" of the serial data format is converted into the parallel data format, and is temporarily stored in the memory 1801. Since the retransmission request is made for the signal $ 1 of the systematic bit data from the signal type information, the count information, the request information, and the bit information input from the control unit 1601, the systematic bit data is read from the memory 1801. The evening signal $ 1 is read out twice, and the systematic bit data signals $ 2 and $ 3 are read out once and output to the PZS converter 1604.
- the transmission signal output from the SZP conversion unit 1603 is stored in the memory 1802 of the PZS conversion unit 1604 from the top of FIG. 19 in the signals $ 1, $ 2, $ 1, They are arranged in the order of $ 3, and are sequentially read from the top of Fig. 19 and converted to serial data format.
- the transmission signals output from the PZS conversion section 1604 are arranged as a systematic bit sequence "$ 1, $ 2, $ 1, $ 3" in a serial format (ST2506).
- the transmission signal subjected to spreading processing by spreading section 1602 is converted to serial data by SZP conversion section 1603 as shown in FIG.
- the parity bit data in the evening format is converted from "$ 1, $ 2, $ 3, $ 4" into the parallel data format and is temporarily stored in the memory 1801. Then, based on the signal type information, number of times information, request information, and bit information input from the control unit 1601, the second retransmission and the retransmission request for the signal $ 1 of the systematic bit data are requested, so that the memory 1801 Only the signal $ 1 of the systematic bit data is read out four times and output to the P / S converter 1604. As shown in FIG.
- the transmission signal output from the S / P conversion unit 1603 is stored in the memory 1802 of the PZS conversion unit 1604 from above the signal $ 1, $ 1, $ 1 of the systematic bit data in FIG. , $ 1, and are sequentially read from the top of FIG. 20 and converted into a serial data format.
- the transmission signals output from the PZS conversion section 1604 are arranged in a serial data format format systematic bit sequence "$ 1, $ 1, $ 1, $ 1" (ST2505) o
- the transmission signal is subjected to orthogonal frequency division multiplexing such as IFFT processing in IFFT section 1605 to obtain an OFDM-CDMA signal (ST 2507).
- orthogonal frequency division multiplexing such as IFFT processing in IFFT section 1605
- OFDM-CDMA signal an OFDM-CDMA signal
- Signal $ 2 is allocated and allocated to subcarriers
- signal $ 2 is allocated and allocated to each subcarrier of second group G2
- signal $ 3 is allocated and allocated to each subcarrier of third group G3
- signal $ 4 is allocated and allocated to each subcarrier of the fourth group G4.
- signal $ 1 is distributed to each subcarrier of the first group G1 and arranged.
- the signal $ 1 is allocated to each subcarrier and arranged similarly to the first group G1
- the signal $ 2 is allocated to the second group G2
- the signal $ 3 is allocated to the second group G2.
- the number of subcarriers is twice as much as that at the time of normal transmission, by the amount of signal $ 1 allocated to each subcarrier of the third group G3.
- the signal $ 1 is allocated to each subcarrier of the first group G1, and is allocated to each of the second group G2, the third group G3, and the fourth group G4. Also, similarly to the first group, signal $ 1 is allocated to each subcarrier and arranged. Therefore, at the time of the second retransmission, compared to the time of the first retransmission, each subcarrier of the second group G3 and each subcarrier of the fourth group G4 are allocated the same subcarrier as the signal $ 1 is allocated. The number doubles.
- the number of subcarriers to which parity bit data is allocated is not changed.However, the number of subcarriers to which parity bit data is allocated may be increased according to the number of retransmissions. . Further, in the seventh embodiment, at the time of retransmission, the number of subcarriers to which systematic bit data is allocated is different from the number of subcarriers to which parity bit data is allocated. However, the present invention is not limited to this. Accordingly, the number of subcarriers for allocating the systematic bit data and the number of subcarriers for allocating the parity bit data may be made the same according to the number of retransmissions.
- FIG. 26 is a diagram showing the configuration of transmitting apparatus 260 according to Embodiment 8 of the present invention.
- Embodiment 8 is characterized in that a retransmission signal is allocated to a subcarrier according to channel quality information. Portions having the same configuration as in FIG. 16 are denoted by the same reference numerals and description thereof will be omitted.
- the control unit 1601 temporarily accumulates the transmission signal modulated by the modulation unit (not shown) and selects the transmission signal into retransmission information and other normal information. And send , ⁇ ,
- the transmission signal is output to spreading section 1602, and the retransmission information is output to SZP conversion section 1603 and P_ / S conversion section 1604.
- the control unit 1601 obtains the channel quality such as CIR (desired wave to interference wave ratio) from the received signal, and uses the obtained line quality as line quality information as the SZP conversion unit 1603 and the PZS conversion unit. Output to 1604.
- the method of detecting the line quality from the received signal can be adopted in the case of a TDD (Time Division Duplex) communication system.
- the line quality information may be transmitted from a communication partner that has been detected.
- the communication partner may transmit the line quality information such as the SIR measurement result measured by the communication partner.
- the S / P conversion unit 1603 serializes the transmission signal input from the spreading unit 1602 as it is.
- the data format is converted to the parallel data format and output to the PZS converter 164.
- SZP conversion section 1603 generates the number of data to be retransmitted included in the retransmission information according to the number of retransmissions.
- the data is converted from the serial data format to the parallel data format and output to the PZS converter 164.
- the number of retransmission signals generated is the same as the number generated at the time of retransmission.
- the PZS converter 1604 converts the transmission signal input from the SZP converter 163 from parallel data format to serial data format and outputs it to the IFFT unit 165 I do. Also, at the time of retransmission, the PZS converter 1604 transmits the retransmission data received from the controller 1601, including the retransmission data generated by the S / P converter 1603. The signals are rearranged, and the rearranged and rearranged transmission signals are output to the IFFT section 1605.
- the evening encoding unit 2601 converts the part of the transmission signal input from the control unit 1601 into a systematic bit data without encoding a part of the transmission signal, and the P / S conversion unit 2602 What At the same time, it performs recursive convolutional encoding on the remaining part of the input transmission signal, and outputs the result to the P / S conversion section 2602 as parity bit data.
- the P / S converter 2602 converts the systematic bit data and parity bit data input from the turbo encoder 2601 from the parallel data format to the serial data format and spreads them. Output to 1602.
- the systematic bit data and the parity bit data are arranged in different symbols.
- control section 1601 determines whether or not the transmission signal is a retransmission signal (ST 270 1), and if retransmission, determines whether or not it is the first retransmission (ST 2701). 7 0 2). Further, control section 1601 determines whether or not the line quality is good, based on the line quality obtained from the received signal. As a method of determining the line quality, it is possible to determine by an arbitrary method such as determining whether or not the line quality is equal to or higher than a threshold. Then, control section 1601 outputs retransmission information composed of signal type information, number of times information, and request information and channel quality information to SZP conversion section 1603 and PZS conversion section 1604.
- the transmission signal subjected to spreading processing in spreading section 1602, as shown in FIG. 18, is converted into a systematic bit of serial data format in SZP conversion section 163.
- the data string "$ 1, $ 2, $ 3, $ 4" is converted into a parallel data format and temporarily stored in the memory 1801.
- the signals $ 1 and $ from the top of FIG. 18 are not rearranged by the PZS conversion section 1604. They are arranged in the memory 1802 in the order of 2, $ 3, and $ 4, and are sequentially read from the top of Fig. 18 and converted into the serial data format.
- the transmission signals output from the PZS conversion section 1604 are arranged in a serial data format "$ 1, $ 2, $ 3, $ 4" (ST2703) .
- the transmission signal subjected to spreading processing in the unit 1602 is converted into a systematic bit sequence “$ 1, $” in the serial data format in the S / P conversion unit 1603. 2, $ 3, $ 4 "is converted into a parallel data format and temporarily stored in the memory 1801. Then, based on the signal type information, number-of-times information, request information, and channel quality information input from control section 1601, the first retransmission is requested for signal $ 1, and control section 16 is requested.
- the transmission signal output from the S / P conversion unit 16 03 is transmitted from the top of FIG. They are arranged in the order of $ 2, $ 1, $ 3, and are sequentially read from the top of Fig. 19 and converted to the serial data format.
- the transmission signals output from the PZS converter 164 are arranged in a serial data format such as "$ 1, $ 2, $ 1, $ 3" (ST2706).
- the transmission signal spread by spreading section 1602 is converted to SZP conversion section 1603 as shown in FIG. Then, the systematic bit sequence "$ 1, $ 2, $ 3, $ 4" in the serial data format is converted into the parallel data format and stored in the memory 1801 once. Then, based on the signal type information, the number of times information, the request information, and the line quality information input from the control unit 1601, it is the first retransmission, a retransmission request for the signal $ 1, and the line quality is poor. Therefore, only signal $ 1 is read four times from memory 1801 and output to P / S converter 164.
- the transmission signal output from the SZP conversion unit 1603 is a signal $ 1, from the top of FIG. 20 in the memory 18 ⁇ 2 of the P / S conversion unit 1604, They are arranged in the order of $ 1, $ 1, $ 1, then read sequentially from the top in Fig. 20 and converted to serial data format.
- Output from P / S conversion section 16 04 The transmitted signals are arranged in a serial data format "$ 1, $ 1, $ 1, $ 1" (ST2704).
- the transmission signal subjected to spreading processing in spreading section 1602 is subjected to a systematic serial data format in SZP converting section 1603 as shown in FIG.
- the bit data sequence "$ 1, $ 2, $ 3, $ 4" is converted into a parallel data format and stored in the memory 1801 once. Then, based on the signal type information, number-of-times information, and request information input from the control unit 1601, the second retransmission and the retransmission request for the signal $ 1 have been made. Only $ 1 is read four times and output to the PZS converter 164.
- the transmission signal output from the SZP conversion unit 16 03 receives a signal $ 1 from the top of FIG. They are arranged in the order of $ 1, $ 1, $ 1, and then read sequentially from the top of Fig. 20 and converted to the serial data format.
- the transmission signals output from the PZS conversion section 1604 are arranged as a systematic bit sequence "$ 1, $ 1, $ 1, $ 1" in the serial data format (ST 27 0 4).
- the transmission signal is subjected to orthogonal frequency division multiplexing processing such as IFFT processing in the IFFT section 165 to obtain an OFDM-CDMA signal (ST2707).
- orthogonal frequency division multiplexing processing such as IFFT processing in the IFFT section 165 to obtain an OFDM-CDMA signal (ST2707).
- the assignment of each signal to the subcarrier in the 0 FDM-CDMA signal thus obtained will be described with reference to FIGS. 21 to 23.
- signal $ 1 is allocated to each subcarrier of the first group G1
- signal $ 2 is allocated to the second group G2.
- the signal $ 3 is allocated and allocated to each subcarrier of the third group G3, and the signal $ 4 is allocated and allocated to each subcarrier of the fourth group G4.
- signal $ 1 is allocated to each subcarrier of the first group G1 and arranged.
- 3 Group G 3 has the same signals as Group 1 $ 1 is allocated to each subcarrier, signal $ 2 is allocated to the second group G2, and signal $ 3 is allocated to the fourth group G4. Therefore, at the time of the first retransmission, the number of subcarriers is twice as much as that at the time of normal transmission, by the amount of signal $ 1 allocated to each subcarrier of the third group G3.
- signal $ 1 is distributed to each subcarrier of the first group G1, as shown in Fig. 23.
- the signal $ 1 is allocated to each subcarrier similarly to the first group. Therefore, at the time of the second retransmission, the number of subcarriers is 2 compared to the time of normal transmission, as much as signal $ 1 is allocated to each subcarrier of second group G3 and each subcarrier of fourth group G4. Double.
- the SZP conversion section and the PZS conversion section are arranged such that the retransmission signal is assigned to the subcarrier in consideration of the channel quality. Therefore, when the line quality is poor, the error rate characteristics can be reliably improved.
- FIG. 28 is a diagram showing the configuration of transmitting apparatus 2800 according to Embodiment 9 of the present invention.
- Embodiment 9 is characterized in that the number of subcarriers to which retransmission signals are allocated is changed in consideration of transmission time intervals.
- Embodiment 9 differs from FIG. 16 in the configuration in which the count unit 2801, the delay unit 2802, the subtraction unit 2803, and the magnitude comparison unit 2804 in FIG. 28 are provided. I do. Portions having the same configuration as in FIG. 16 are denoted by the same reference numerals, and description thereof is omitted.
- CSMA Carrier Sence Multiple Access
- the time interval between the previous transmission and the current transmission is very short. May be longer. In this case, if the second or third retransmission results in an error, the transmission delay may become extremely large. To avoid this, it is also effective to change the number of subcarriers to which retransmission signals are allocated, taking into account the transmission time interval from the previous transmission to the current transmission.
- the CSMA is transmitted when the terminal performs carrier sensing and the reception level is below the threshold.
- the counter section 2801 generates information indicating the transmission timing based on the transmission timing input from the control section 1601, and outputs the information to the delay section 2802 and the subtraction section 2803.
- the delay unit 2802 delays the information indicating the transmission timing input from the count unit 2801, and outputs the information to the subtraction unit 2803.
- the subtraction unit 2803 transmits the previously transmitted transmission timing and the current transmission based on the information indicating the transmission timing input from the counter unit 2801 and the information indicating the transmission timing input from the delay unit 2802.
- the difference from the transmission timing is calculated, and the calculated transmission timing difference is output as a transmission time interval to the magnitude comparison unit 2804.
- the magnitude comparison unit 280 4 compares the transmission time interval input from the subtraction unit 280 3 with the threshold, and outputs transmission time interval information indicating whether or not the transmission time interval is greater than or equal to the threshold value. Output to the SZP converter 166 and PZS converter 164.
- the SZP conversion unit 1603 converts the transmission signal input from the spreading unit 1602 from the serial data Convert to evening format and output to PZS converter 164.
- S / P conversion section 1603 determines the number of data to be retransmitted included in the retransmission information according to the number of retransmissions. Generate and convert from serial data format to parallel data format and output to P / S converter 164.
- the SZP conversion unit 1603 performs the first retransmission. Even if it does, it generates retransmission signals for the number of subcarriers assigned to the retransmission signal during the second retransmission.
- P / S conversion section 1604 converts the transmission signal input from S / P conversion section 1603 from a parallel data format to a serial data format and outputs it to IFFT section 1605.
- P / S conversion section 1604 rearranges transmission signals including retransmission data generated by S / P conversion section 1603 based on the retransmission information input from control section 1601.
- the rearranged transmission signals are output to the IFFT unit 1605.
- control section 1601 determines whether or not the transmission signal is a retransmission signal (ST 2901) and, if retransmission, determines whether or not it is the first retransmission (ST 2902). Also, the subtraction unit 2803 converts the calculated transmission time interval into an SZP conversion unit.
- the transmission signal that has been spread by spreading section 1602 is subjected to serial data format systematic bit decoding in S / converting section 1603, as shown in FIG. $ 1, $ 2, $ 3, $ 4 "is converted into a parallel data format and stored in the memory 1801 once.
- the signals $ 1, $ 2, $ 3, and $ 4 from the top of FIG. They are arranged in the memory 1802 in order, and are sequentially read from the top of FIG. 18 and converted into serial data format.
- the transmission signals output from PZS conversion section 1604 are arranged in a serial data format "$ 1, $ 2, $ 3, $ 4" (ST 2903).
- the 3 /? Conversion section 1603 is the case of the first retransmission
- the transmission signal spread by the spreading unit 1602 is transmitted to the S / P conversion unit 1603 as shown in FIG.
- the data sequence "$ 1, $ 2, $ 3, $ 4" is converted into a parallel data format and temporarily stored in the memory 1801.
- the control unit 1601 determines whether or not the first retransmission is performed (ST 290 2), which is the first retransmission and a request for retransmission of signal $ 1 was made, and the result of judging whether the transmission time interval is equal to or greater than the threshold value by the size comparison unit 280 4 (ST Since the transmission time interval is less than the threshold value, signal $ 1 is read twice from memory 1801, and signals $ 2 and $ 3 are read once each, and P / Output to S conversion section 16 04.
- the transmission signal output from the SZP conversion unit 1603 is stored in the memory 1802 of the P / S conversion unit 1604 in the form of a signal $ 1, They are arranged in the order of $ 2, $ 1, $ 3, and are sequentially read from the top of Fig. 19 and converted to the serial data format.
- the transmission signals output from the PS converter 164 are arranged in a serial data format "$ 1, $ 2, $ 1, $ 3" (ST2906) .
- the transmission signal spread by the spreading unit 1602 is As shown in FIG. 20, the SZP conversion section 1603 converts the systematic bit data string "$ 1, $ 2, $ 3, $ 4" in the serial data format into the parallel data format. Once stored in memory 1801. Then, based on the signal type information, number-of-times information, request information, and transmission time interval information input from the control unit 1601, the first retransmission and the retransmission request for the signal $ 1 have been requested. Since the time interval is greater than or equal to the threshold value, only signal $ 1 is read from memory 1801 four times and output to PZS converter 164.
- the transmission signal output from the S / P conversion unit 1603 is converted into a signal $ from the top of FIG. 20 in the memory 1802 of the P / S conversion unit 1604. They are arranged in the order of 1, $ 1, $ 1, $ 1, and are read sequentially from the top of Fig. 20 and converted to the serial data format.
- the transmission signal output from the PZS converter 1604 is a serial data format data stream “$ 1, $ 1, $ 1, $ 1”. (ST 2904) o
- the transmission signal subjected to spreading processing in spreading section 1602 is converted into serial data in S / P conversion section 1603 as shown in FIG.
- the systematic bit data string "$ 1, $ 2, $ 3, $ 4" is converted into a parallel data format and temporarily stored in the memory 1801. Then, based on the signal type information, number-of-times information, and request information input from the control unit 1601, a retransmission request is made for the signal $ 1, so that only the signal $ 1 is read from the memory 1801 four times.
- the transmission signal output from the S / P conversion unit 1603 is converted into a signal $ 1 from the top of FIG. 20 in the memory 1802 of the PZS conversion unit 1604. , $ 1, $ 1, and $ 1 in that order, and are sequentially read from the top of FIG. 20 and converted to serial data format.
- the transmission signals output from the PZS converter 164 are arranged in a systematic bit sequence “$ 1, $ Is $ 1, $ 1” in serial data format (ST 2 904).
- the transmission signal is subjected to orthogonal frequency division multiplexing such as IFFT processing in the IFFT section 1605 to obtain an OFDM-CDMA signal (ST2907).
- orthogonal frequency division multiplexing such as IFFT processing in the IFFT section 1605 to obtain an OFDM-CDMA signal (ST2907).
- the assignment of each signal to the subcarriers in the thus obtained ⁇ FDM-CDMA signal will be described using FIGS. 21 to 23.
- signal $ 1 is allocated to each subcarrier of the first group G1
- signal $ 2 is allocated to the second group G1.
- Signal $ 3 is allocated and allocated to each subcarrier of the third group G3, and signal $ 4 is allocated and allocated to each subcarrier of the fourth group G4. .
- signal $ 1 is distributed to each subcarrier of the first group G1.
- the signal $ 1 is allocated to each subcarrier in the same manner as the first group G1, and the signal $ 2 is allocated. 200
- the number of subcarriers is twice as much as the signal $ 1 assigned to each subcarrier of the third group G3 as compared with the time of normal transmission.
- signal $ 1 is distributed to each subcarrier of the first group G1, as shown in Fig. 23.
- the signal $ 1 is allocated to each subcarrier similarly to the first group. Therefore, at the time of the second retransmission, the number of subcarriers is twice as large as that at the time of normal transmission, as the signal $ 1 is allocated to each subcarrier of the second group G2 and each subcarrier of the fourth group G4. become.
- the s / p converter and the pzs converter allocate the retransmission signal to the subcarrier in consideration of the transmission time interval. In this arrangement, it is possible to prevent the transmission delay from becoming extremely large by performing retransmission many times when the transmission time interval is long.
- FIG. 30 is a diagram showing a configuration of transmitting apparatus 300 0 according to Embodiment 10 of the present invention.
- Embodiment 10 is characterized in that the number of subcarriers to which retransmission signals are allocated is changed in consideration of the usage status of the used band. Portions having the same configuration as in FIG. 16 are denoted by the same reference numerals, and description thereof will be omitted.
- the control unit 1601 receives the information on the usage status of the band from the communication partner or, if the available bandwidth is known as the available bandwidth, uses the currently used bandwidth for the allowable bandwidth. By calculating the bandwidth ratio, it is possible to know how much room is left in the remaining bandwidth, so the information on the ratio of the used bandwidth to the allowable bandwidth (hereinafter referred to as “bandwidth information”) is converted to SZP. Output to the module 1603 and the PZS converter 1604. If normal transmission is performed based on the retransmission information input from the control unit 1601, the SZP conversion unit 1603 converts the transmission signal input from the spreading unit 1602 from the serial data Convert to evening format and output to PZS converter 164.
- SZP conversion section 1603 generates data to be retransmitted included in the retransmission information by the number corresponding to the number of retransmissions, and performs serial transmission.
- the data format is converted to the parallel data format and output to the P / S converter 164.
- the S / P conversion unit 1603 can perform the second retransmission even if it is the first retransmission.
- the number of retransmission signals corresponding to the number of subcarriers assigned to the retransmission signal is generated.
- the PZS converter 1604 converts the transmission signal input from the SZP converter 1603 from a parallel data format to a serial data format, and Go out to 5. Also, at the time of retransmission, the PZS conversion section 1604 rearranges transmission signals, including the retransmission data generated by the conversion section 1603, from the retransmission information input from the control section 1601. Then, the rearranged transmission signals are output to the IFFT section 1605.
- FIG. 31 is a flowchart showing the operation of transmitting apparatus 30000.
- the control unit 16 ⁇ 1 determines whether or not the transmission signal is a retransmission signal (ST 3101) and, if retransmission, determines whether or not it is the first retransmission (ST 3101). 1 0 2). Also, the control unit 1601 determines the size of the ratio of the used band to the allowable used band (ST 3105), and uses the discrimination result as band information and the SZP conversion unit 1613 and the P / S conversion. Output to section 1604.
- the transmission signal subjected to spreading processing in spreading section 1602 is converted into a serial data format system in S / P conversion section 163, as shown in FIG. It is converted from the parallel bit sequence "$ 1, $ 2, $ 3, $ 4" to the parallel sequence and stored in the memory 1801 once. Since the transmission signal output from the SZP conversion section 1603 is at the time of normal transmission, the signals $ 1, $ 2, $ 3, $ from the top of FIG. 18 are not rearranged by the P / S conversion section 1604. They are arranged in the memory 1802 in the order of 4, and are sequentially read from the top of FIG. 18 and converted into serial data format.
- the transmission signals output from PZS conversion section 1 604 are arranged in a serial data format like "$ 1, $ 2, $ 3, $ 4" (ST3103).
- the transmission signal subjected to spreading processing in spreading section 1602 is transmitted to S / P conversion section 1603 as shown in FIG.
- a serial data format systematic data sequence "$ 1, $ 2, $ 3, $ 4" is converted into a parallel data format and temporarily stored in the memory 1801. Then, based on the signal type information, number of times information, request information, and band information input from the control unit 1601, it is the first retransmission, the signal $ 1 is requested to be retransmitted, and there is no room in the band. Thus, signal $ 1 is read out twice, and signals $ 2 and $ 3 are read out once and output to PZS conversion section 1604.
- the transmission signal output from the S / P converter 1603 is stored in the memory 1802 of the PZS converter 1604 in the order of signals $ 1, $ 2, $ 1, $ 3 from the top of FIG. Then, the data is sequentially read from the top of FIG. 19 and converted into a serial data format.
- the transmission signals output from PZS conversion section 1604 are arranged in a serial data format such as "$ 1, $ 2, $ 1, $ 3" (ST 3106).
- the transmission signal spread by the spreading section 1602 is transmitted to the SZP conversion section 1603 as shown in FIG. It is converted into a parallel data format from the text data sequence "$ 1, $ 2, $ 3, $ 4" and temporarily stored in the memory 1801. Then, based on the signal type information, the number of times information, the request information, and the band information input from control section 1601, it is the first retransmission, and a retransmission request is made for signal $ 1. At the same time, since there is room in the bandwidth, only signal $ 1 is read from memory 1801 four times and output to PZS conversion section 1604.
- the transmission signal output from the S / P converter 1603 is stored in the memory 1802 of the PZS converter 1604 in the order of signals $ 1, $ 1, $ 1, $ 1 from the top in FIG. Then, the data is sequentially read from the top of FIG. 20 and converted into a serial data format.
- the transmission signals output from PZS conversion section 1604 are arranged in a serial data format "$ 1, $ 1, $ 1, $ 1" (ST3104).
- the transmission signal subjected to spreading processing in spreading section 1602 is converted into a serial data bit stream in SZP conversion section 1603 as shown in FIG. "$ 1, $ 2, $ 3, $ 4" is converted into a parallel data format and stored in the memory 1801 once. Then, based on the signal type information, the number of times information, and the request information input from the control unit 1601, since the second retransmission and the retransmission request for the signal $ 1 have been made, only the signal $ 1 from the memory 1801 is received. It is read four times and output to the PZS converter 1604.
- the transmission signal output from the SZP conversion unit 1603 is stored in the memory 1802 of the P / S conversion unit 16 ⁇ 4 from the top of the signal $ 1, $ 1, $ 1, $ 1 in FIG. They are arranged in order, and are sequentially read from the top of FIG. 20 and converted into serial data format.
- the transmission signals output from P / S conversion section 1604 are arranged as a systematic bit sequence "$ 1, $ 1, $ 1, $ 1j" in a serial data format (ST 3104 ).
- the transmission signal is subjected to orthogonal frequency division multiplexing such as IFFT processing in IFFT section 1605 to obtain an OFDM-CDMA signal (ST3107).
- orthogonal frequency division multiplexing such as IFFT processing in IFFT section 1605 to obtain an OFDM-CDMA signal (ST3107).
- signal $ 1 is allocated to each subcarrier of the first group G1 and arranged.
- $ 2 is allocated and allocated to each subcarrier of the second group G2
- signal $ 3 is allocated and allocated to each subcarrier of the third group G3
- signal $ 4 is allocated to each of the fourth group G4. Allocated to subcarriers and arranged.
- signal $ 1 is allocated to each subcarrier of the first group G1 and arranged.
- the signal $ 1 is allocated to each subcarrier, and the signal $ 2 is allocated to the second group G2, and the signal $ 3 is allocated to the second group G2.
- the number of subcarriers is twice as much as the signal $ 1 assigned to each subcarrier of the third group G3 as compared with the normal transmission.
- the signal $ 1 is distributed to each subcarrier of the first group G1.
- the signal $ 1 is allocated to each subcarrier similarly to the first group. Therefore, at the time of the second retransmission, the number of subcarriers is twice as large as that at the time of normal transmission, as signal $ 1 is allocated to each subcarrier of second group G2 and each subcarrier of fourth group G4. become.
- the S / P conversion section and the PZS conversion section perform retransmission by taking into consideration whether or not there is a margin in the band.
- They are arranged so that they can be assigned to subcarriers, so that it is possible to prevent an increase in transmission delay without lowering the transmission efficiency when there is sufficient bandwidth.
- FIG. 32 is a diagram showing the configuration of transmitting apparatus 320 according to Embodiment 11 of the present invention.
- Embodiment 11 is characterized in that the upper limit of the number of retransmissions is set. Is what you do.
- the evening-both coding section 3201, the P / S conversion section 3202, the selection section 3203, and the size comparison section 3204 are provided in FIG.
- the configuration differs from that in FIG. Portions having the same configuration as in FIG. 16 are denoted by the same reference numerals, and description thereof will be omitted.
- the control section 1601 serving as retransmission number control means temporarily stores a transmission signal modulated by a modulation section (not shown), and sorts the transmission signal into retransmission information and other normal information. .
- the transmission signal is output to spreading section 1602, and the retransmission information is transmitted to S / P conversion section 1603, PZS conversion section 1604 and size comparison section.
- the control unit 1601 obtains the line quality such as a desired signal to interference wave ratio (CIR) from the received signal, and uses the obtained line quality as the line quality information as the SZP conversion unit 1603 and the PZS conversion.
- CIR desired signal to interference wave ratio
- control section 1601 outputs band information to selection section 3203.
- control section 1601 stops outputting the retransmission signal.
- the turbo coding unit 3201 outputs a part of the transmission signal input from the control unit 1601 to the PZS conversion unit 3202 as a systematic bit data without coding, Then, recursive convolution coding is performed on the remaining part of the input transmission signal, and the result is output to the P / S conversion section 3202 as parity bit data.
- the PZS conversion unit 3202 converts the systematic bit data and parity bit data input from the evening encoding unit 3201 from the parallel data format to the serial data format, and Output to the scatter section 1602. All of the systematic bit data and parity bit data converted by the PZS converter 322 are composed of systematic bits or parity bits for each symbol.
- the selection section 3203 selects the threshold value ⁇ or the threshold value ⁇ based on the band information input from the control section 1601, and outputs the selected value to the magnitude comparison section 3204. In other words, if the ratio of the current bandwidth used to the allowed bandwidth is large, the threshold /? Select Threshold> Threshold 5), and select Threshold if the percentage of the current bandwidth used to the allowable bandwidth is small. As described above, since the threshold is selected according to the bandwidth information, the upper limit of the number of retransmissions can be adaptively changed according to the bandwidth usage, thereby achieving both system throughput and error rate characteristics. be able to.
- the size comparison unit 3204 compares the number of retransmissions with the threshold or threshold ⁇ input from the selection unit 3203 based on the number of times information input from the control unit 1601, and determines the number of retransmissions. If it is not less than the threshold value, it outputs a termination signal to the control unit 1601. On the other hand, if the number of retransmissions is less than the threshold, nothing is output.
- the operation of transmitting apparatus 320 is the same as that in FIG. 27 except that retransmission is terminated when the number of retransmissions reaches a predetermined number in accordance with the band information, and therefore description thereof is omitted.
- the magnitude comparison unit performs a case where the number of retransmissions is equal to or greater than the threshold. Since the retransmission is terminated in the first time, the throughput of the entire system can be increased.
- the thresholds to be selected depending on whether there is enough bandwidth are two types of thresholds, one threshold / ?, but the present invention is not limited to this, and three or more types are available. May be selected from the following threshold values.
- the transmission signal is encoded at the same time, the transmission signal is not limited to this, and the transmission signal may be encoded by an encoding method other than the turbo encoding.
- transmission signals are rearranged using channel quality information. However, the present invention is not limited to this, and transmission signals may be rearranged using only retransmission information.
- the threshold value is selected by the selecting unit in accordance with the ratio of the used bandwidth to the allowable used bandwidth.
- the present invention is not limited to this, and only the size of the used bandwidth is used. Any method, such as selecting a threshold, can be adopted.
- the number of retransmissions is set to two has been described, but the number of retransmissions is not limited to two, and the number of retransmissions can be set to any number other than two. can do.
- Embodiments 1 to 5 described above three types of GI lengths are set.
- the present invention is not limited to the case where three types of GI lengths are set. It is possible to set the length.
- the length of the GI is set to 1/8, 1/4, and 3/8 of the effective symbol length according to the number of retransmissions.
- the length of the GI can be set to an arbitrary length according to the number of retransmissions.
- all subcarriers are divided into four groups.
- the present invention is not limited to this, and it is possible to arrange subcarriers arbitrarily.
- the number of subcarriers to which signals are allocated is changed from the time of normal transmission to the time of second retransmission, but the present invention is not limited to this. Up to three or more retransmissions, the number of subcarriers to which retransmission signals are allocated may be increased.
- the number of subcarriers to be allocated from the time of normal transmission to the time of the second retransmission is increased for each group.
- the present invention is not limited to this. In this case, the number of subcarriers to be allocated from the time of normal transmission to the time of the second retransmission without subcarrier grouping may be increased for each subcarrier.
- the retransmission signal is read out multiple times from the S / P converter and the number of subcarriers for arranging the retransmission signal is rearranged by rearranging the transmission signals by the PZS converter.
- the present invention is not limited to this, and it is possible to increase the number of subcarriers for arranging retransmission signals when performing orthogonal frequency division multiplexing processing in the IFFT unit without rearranging.
- the number of subcarriers in which retransmission signals are arranged may be increased by separately providing an IFFT section for performing division multiplexing.
- the subcarriers are divided into four groups.
- the present invention is not limited to this, and the number of groups can be any number.
- the retransmission signal is newly generated in the SZP conversion unit.
- the retransmission signal may be read out from the memory a corresponding number of times.
- Embodiments 1 to 11 can be applied to a base station apparatus or a communication terminal apparatus.
- the present invention is suitable for use in a transmission apparatus and a transmission method that use a multicarrier modulation scheme such as an OFDM (Orthogonal Frequency Division Multiplexing) scheme.
- a multicarrier modulation scheme such as an OFDM (Orthogonal Frequency Division Multiplexing) scheme.
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CN200380103519.2A CN1711710B (zh) | 2002-11-18 | 2003-11-13 | 发送装置和发送方法 |
EP03774003A EP1564920B1 (en) | 2002-11-18 | 2003-11-13 | Transmitter apparatus and transmitting method |
US10/534,987 US7746762B2 (en) | 2002-11-18 | 2003-11-13 | Transmitting apparatus and transmitting method |
AU2003284544A AU2003284544A1 (en) | 2002-11-18 | 2003-11-13 | Transmitter apparatus and transmitting method |
DE60332146T DE60332146D1 (de) | 2002-11-18 | 2003-11-13 | Sendervorrichtung und Sendeverfahren |
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JP2002333448A JP3796211B2 (ja) | 2002-11-18 | 2002-11-18 | 送信装置及び送信方法 |
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JP2002-355079 | 2002-12-06 | ||
JP2002355079A JP4163937B2 (ja) | 2002-12-06 | 2002-12-06 | Ofdm−cdma送信装置及びofdm−cdma送信方法 |
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Also Published As
Publication number | Publication date |
---|---|
US7746762B2 (en) | 2010-06-29 |
US20060062140A1 (en) | 2006-03-23 |
EP1564920A4 (en) | 2008-11-05 |
EP1564920B1 (en) | 2010-04-14 |
AU2003284544A1 (en) | 2004-06-15 |
DE60332146D1 (de) | 2010-05-27 |
EP1564920A1 (en) | 2005-08-17 |
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