WO2006090856A1 - Système de communication, dispositif de communication, méthode de correction d’erreur et programme de contrôle de communication - Google Patents

Système de communication, dispositif de communication, méthode de correction d’erreur et programme de contrôle de communication Download PDF

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Publication number
WO2006090856A1
WO2006090856A1 PCT/JP2006/303481 JP2006303481W WO2006090856A1 WO 2006090856 A1 WO2006090856 A1 WO 2006090856A1 JP 2006303481 W JP2006303481 W JP 2006303481W WO 2006090856 A1 WO2006090856 A1 WO 2006090856A1
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WIPO (PCT)
Prior art keywords
communication data
data
processed
communication
error correction
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PCT/JP2006/303481
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English (en)
Japanese (ja)
Inventor
Masamitsu Nishikido
Yasuhiro Nakamura
Nobuyuki Tanaka
Yuuya Tounai
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Kyocera Corporation
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Application filed by Kyocera Corporation filed Critical Kyocera Corporation
Priority to CN2006800056369A priority Critical patent/CN101129011B/zh
Publication of WO2006090856A1 publication Critical patent/WO2006090856A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0041—Arrangements at the transmitter end
    • 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
    • H04L1/0045—Arrangements at the receiver end

Definitions

  • the present invention relates to a communication system, a communication device, an error correction method, and a communication control program.
  • the present invention relates to a technique for correcting an error occurring in a communication path.
  • error correction is generally performed on a communication path using an error correction code.
  • the transmission device performs modulation processing on the communication data that has been subjected to error correction coding and transmits the data
  • the reception device performs demodulation processing on the received communication data and then performs error correction decoding.
  • Patent Document 1 describes an example of such error correction.
  • Patent Document 1 Japanese Patent Laid-Open No. 2001-251197
  • a communication system according to the present invention for solving the above problem is a communication system including a transmission device and a reception device, wherein the transmission device is a process that is at least a part of communication data to be communicated.
  • a processed communication data generating means for generating processed communication data as a processed portion subjected to differential encoding and error correction encoding in this order for the target portion, and the processed communication data Transmitting means for transmitting the processed communication data generated by the generating means, wherein the receiving device receives the transmitted processed communication data, and the received processed communication data
  • An error correction decoded data acquisition means for acquiring error correction decoding data obtained by performing error correction decoding on the processed portion is different from the error correction decoding data. Including differential decoding means for decoding, and wherein the.
  • bit errors of processed communication data that have occurred in the communication path are reduced to the same number of error bits as the number of error bits. Correction can be made by an error correction code that can be corrected.
  • the processed communication data generating means includes: a differential encoding means before transmission for differentially encoding a given portion of the communication data; and the differential Error correction encoding means for performing error correction encoding on the encoded part, and the predetermined generation processing differentially encodes the processing target part by the pre-transmission differential encoding means,
  • the process may be a process of generating the processed communication data by performing an error correction code by means of the error correction code.
  • bit errors of processed communication data that have occurred in the communication path are represented by the same number of error bits as the number of error bits. Can be corrected by an error correction code that can correct the error.
  • the communication data is data composed of at least one type of code data each indicating a code
  • the processed communication data generation means includes the code data
  • a storage unit that stores predetermined generation data in association with each other, and a given part of the communication data is stored by the storage unit in association with the code data constituting the given part.
  • a pre-transmission differential encoding unit that reads the generation data and differentially encodes the read generation data;
  • the generation data is obtained by performing differential encoding and error correction encoding on the code data stored in association with the generation data when the generation data is differentially encoded.
  • the predetermined generation process generates the data obtained by performing differential code input by the pre-transmission differential code input means on the processing target portion.
  • the processed part may be a process for generating the processed communication data.
  • bit errors of processed communication data that have occurred in the communication path are represented by the same number of error bits as the number of error bits. Can be corrected by an error correction code that can correct the error.
  • the configuration of the transmission apparatus can be simplified.
  • the receiving means includes delay detecting means for performing delay detection on the processed communication data transmitted by the transmitting means, and the error correction decoding means is the delay detecting means.
  • a post-reception differential code key means for performing differential code keying on the processed portion of the processed communication data delayed-detected by the error correction decoding means, wherein the error correction decoding means comprises the post-reception difference
  • the error correction decoded data may be obtained by performing error correction decoding on the processed portion that has been differentially encoded by the dynamic encoding means.
  • differential decoding is performed at the same time as detection, so that it is difficult to perform error correction decoding before differential decoding. Therefore, according to the present invention, differential encoding can be performed once after delay detection, error correction decoding can be performed, and then differential decoding can be performed again. Therefore, even when delay detection is performed, the processing that has occurred in the communication path can be performed. Bit errors in processed communication data can be corrected with an error correction code that can correct the same number of error bits as the number of error bits.
  • the transmitting means transmits the processed communication data generated by the processed communication data generating means as a phase-modulated symbol, and the communication data is The symbol corresponding to the predetermined content portion of the communication data is designed to have a known phase.
  • Predetermined content portion detection means for detecting the predetermined content portion of the processed communication data delayed-detected by the stage, symbol acquisition means for acquiring a symbol for the portion corresponding to the detected predetermined content portion, and Phase rotation amount acquisition means for acquiring the phase rotation amount of the processed communication data received by the receiving means based on the phase of the acquired symbol and the known phase; and the acquired Phase compensation means for performing phase compensation on the processed portion of the processed communication data delayed-detected by the delay detection means based on the phase rotation amount, and the post-reception differential encoding
  • the means may perform differential signing on the processed part phase-compensated by the phase compensation means.
  • phase rotation occurs in the communication path
  • the phase of the symbol corresponding to the first bit does not return to the phase before phase rotation even by delayed detection. Therefore, if differential encoding is performed again after delay detection, data affected by phase rotation is output.
  • the phase rotation amount in the communication path can be acquired by the known phase and phase compensation can be performed. Therefore, even when differential encoding is performed again after delay detection, the receiving apparatus can perform differential decoding. It is possible to perform error correction decoding before the key.
  • the communication device provides processed communication data obtained by performing differential coding and error correction coding in this order for at least a part of communication data to be communicated. And a processed communication data generating means generated by a predetermined generating process, and a transmitting means for transmitting the processed communication data generated by the processed communication data generating means.
  • a communication device includes: a receiving unit that receives communication data; and error correction obtained by performing error correction decoding on at least a part of the received communication data. It comprises error correction decoded data acquisition means for acquiring decoded data, and differential decoding means for differentially decoding the error correction decoded data.
  • the error correction method is an error correction method for correcting an error occurring in a communication path, and is applied to a processing target portion that is at least a part of communication data to be communicated.
  • a processed communication data generation process for generating processed communication data as a processed part subjected to differential encoding and error correction encoding in this order by a predetermined generation process.
  • a transmission step for transmitting the processed communication data generated in the step, the received communication data generation step, a reception step for receiving the transmitted processed communication data, and the received An error correction decoding data acquisition step for acquiring error correction decoding data obtained by performing error correction decoding on the processed portion of the processed communication data; and differential decoding of the error correction decoding data And a differential decoding step.
  • the communication control program according to the present invention is a processed communication data obtained by performing differential encoding and error correction encoding in this order for at least a part of communication data to be communicated.
  • the computer is caused to function as a processed communication data generating unit that generates a predetermined communication process, and a transmission unit that transmits the processed communication data generated by the processed communication data generating unit. .
  • a communication control program includes a receiving unit that receives communication data, and an error correction that is obtained by performing error correction decoding on at least a part of the received communication data.
  • the computer is caused to function as error correction decoded data acquisition means for acquiring decoded data and differential decoding means for differential decoding of the error correction decoded data.
  • FIG. 1 is a system configuration diagram of a mobile communication system according to an embodiment of the present invention.
  • FIG. 2 is an explanatory diagram of a differential code key process according to an embodiment of the present invention.
  • FIG. 3 is a functional block diagram of a transmitting apparatus according to an embodiment of the present invention.
  • FIG. 4 is a diagram showing a communication frame according to the embodiment of the present invention.
  • FIG. 5 is an explanatory diagram of processing relating to a Hamming code non-execution region according to an embodiment of the present invention.
  • FIG. 6 is an explanatory diagram of processing relating to a Hamming code implementation region according to the embodiment of the present invention.
  • FIG. 7 is a diagram showing a Hamming code key table according to the embodiment of the present invention.
  • FIG. 8 is an explanatory diagram of a process related to an adaptive modulation region according to the embodiment of the present invention.
  • FIG. 9 is a functional block diagram of a receiving apparatus according to an embodiment of the present invention.
  • FIG. 10 is a functional block diagram of a receiving apparatus according to an embodiment of the present invention.
  • FIG. 11 is an explanatory diagram of processing relating to a Hamming code non-execution region according to the embodiment of the present invention.
  • FIG. 12 is an explanatory diagram of processing relating to a Hamming code implementation region according to an embodiment of the present invention.
  • FIG. 13 shows a quasi-hamming code table according to an embodiment of the present invention.
  • FIG. 14 is a functional block diagram of a transmission apparatus according to an embodiment of the present invention.
  • FIG. 1 is a configuration diagram of a mobile communication system 10 according to the present embodiment.
  • the mobile communication system 10 includes a base station device 20, a mobile station device 30, and a communication network 40.
  • the mobile station device 30 and the communication network 40 are configured to be able to communicate with each other via the base station device 20.
  • Base station apparatus 20 is configured to be able to communicate with each other between mobile station apparatus 30 and communication network 40.
  • Both the mobile station device 30 and the base station device 20 are communication devices having a wireless communication function, and are configured to be able to perform wireless communication with each other via an antenna provided therein.
  • the transmission side communication device modulates communication data by a predetermined modulation method, and transmits it as a wireless signal from the antenna.
  • the receiving side communication device receives the radio signal arriving at the antenna, demodulates it with a predetermined modulation method, and acquires the original communication data.
  • the mobile station device 30 and the base station device 20 each perform such wireless communication as a transmission-side communication device or a reception-side communication device.
  • the base station device 20 will be described as a transmission side communication device and the mobile station device 30 will be described as a reception side communication device. It is the same.
  • Base station apparatus 20 first obtains communication data to be communicated, and performs differential encoding to obtain processed communication data.
  • differential encoding the base station apparatus 20 first sets the first bit 1000-1 of the communication data as it is as the bit 1002-1 of the processed communication data.
  • the base station device 20 performs an exclusive OR operation on the bit 1000-2 of the communication data and the bit 1002-1 of the processed communication data one bit before, thereby obtaining the bit 1000-2. Get bit 1002-2 of the corresponding processed communication data.
  • the base station apparatus 20 generates processed communication data based on the communication data by performing an exclusive OR operation on the communication data one bit before and the communication data.
  • the base station apparatus 20 modulates the processed communication data obtained in this way to generate a radio signal.
  • a radio signal In Fig. 2, an example of BPSK (Binary Phase Shift Keying) is shown.
  • Base station apparatus 20 assigns a symbol of phase ⁇ to bit 0 and a symbol of phase 0 to bit 1 for symbolization. Modulates the processed communication data and acquires the radio signal as a result of the modulation.
  • the radio signal obtained in this way is transmitted from the antenna and received by the mobile station device 30.
  • the mobile station device 30 performs synchronous detection on the received radio signal. In the synchronous detection, the mobile station device 30 replaces the symbol of the radio signal with the bit assigned to the symbol. The bit string obtained in this way becomes processed communication data.
  • the mobile station device 30 performs differential decoding on the processed communication data.
  • Differential decoding is an inverse conversion process of differential encoding.
  • the mobile station device 30 exclusively processes the bit 10082 of the processed communication data and the bit 1008-1 of the processed communication data one bit before.
  • bit 1010-2 of the communication data corresponding to bit 1008-2 is obtained.
  • the mobile station device 30 uses the communication data bit 1010-1 as it is for the first bit 1008-1 of the processed communication data. In this manner, the mobile station device 30 generates communication data based on the processed communication data by performing an exclusive OR operation on the processed communication data one bit before and the processed communication data.
  • the base station device 20 uses the communication data as processed communication data as it is.
  • the mobile station device 30 also does not perform differential decoding, and the received processed communication data is used as communication data as it is.
  • the phase may rotate in the wireless section.
  • the symbol phase ⁇ may change to phase 0 and the phase 0 may change to phase ⁇ .
  • the amount of phase rotation is not limited to ⁇ , and any phase rotation can be received.
  • the phase rotation amount is constant in one communication data, even if the phase rotates in this way, the original communication data can be acquired by performing differential decoding.
  • actual communication data is used in which, for example, a predetermined surplus bit of 1 bit is added to the head of the content of significant data to be transmitted included in the communication data.
  • the bit subjected to phase rotation is used as it is for the first bit of communication data. For this reason, the first bit is not used as significant data but is used only for differential code processing.
  • the base station apparatus 20 assigns a predetermined absolute phase to a symbol at a predetermined position in the radio signal (hereinafter referred to as an absolute phase symbol) so that the inverted bit string can be restored.
  • the predetermined position and the predetermined absolute phase are determined in advance between the base station apparatus 20 and the mobile station apparatus 30. That is, the absolute phase is a known phase between the base station device 20 and the mobile station device 30. Then, the base station apparatus 20 generates communication data such that the absolute phase symbol partial power of the radio signal always has the absolute phase (for example, phase 0). Then, the mobile station device 30 detects the absolute phase symbol and confirms the phase to confirm whether or not the phase is rotating. If it is rotating as a result of confirmation, phase compensation is performed by correcting the phase of the communication signal. In the case where differential decoding is not performed! /, In this case, the phase correction using the absolute phase is performed.
  • a process for the mobile station device 30 to acquire an absolute phase symbol will be described.
  • a predetermined bit string called a unique word is stored in both the base station device 20 and the mobile station device 30.
  • a portion for example, the last bit of the unique word
  • the unique word is designed to be the absolute phase symbol.
  • the base station apparatus 20 generates communication data including the unique word, modulates the processed communication data generated based on the communication data, and transmits it as a radio signal.
  • the mobile station device 30 calculates the cross-correlation between the received data obtained by synchronous detection of the radio signal arriving at the antenna and the unique word. By calculating the cross-correlation in this way, the mobile station device 30 detects a portion having the same bit string as the unique word from the bit string of the received data based on the result. An absolute phase symbol is acquired based on the detected unique word.
  • BPSK has been described as an example of the modulation scheme.
  • the present embodiment uses other various modulation schemes. For example, ⁇ ⁇ 4 shift QPSK (7u / 4 Shift Quadrature Phase Shift Keying), 8PSK (8 Phase Shift Keying), 16QAM (16 Quadrature Amplitude Modulation) Amplitude modulation), FSK (Frequency Shift Keying), ASK (Amplitu de Shift Keying), etc.
  • the mobile communication system 10 according to the present embodiment also uses an adaptive modulation scheme that performs communication while appropriately changing the modulation scheme according to the reception state of the radio signal.
  • FIG. 3 is a functional block diagram showing functional blocks of the base station device 20.
  • the base station apparatus 20 includes a switch unit 100a, a differential encoding unit 102a, a Hamming code unit 103, a modulation unit 104a, a switch unit 105, a radio transmission unit 106, and a phase control unit 107. Consists of including.
  • FIG. 4 is a diagram showing a structure of communication data transmitted / received in the present embodiment.
  • Communication data is divided into one or more communication frames and transmitted.
  • this communication frame has a Hamming coding non-execution region S1, a Hamming coding execution region S2, and an adaptive modulation region S3.
  • both the Hamming coding non-execution region S1 and the Hamming coding execution region S2 are modulated by a modulation scheme that performs differential encoding. Specifically, ⁇ ⁇ 4 shift QPSK modulation, BPSK, and other forces can be cited.
  • the explanation is based on the assumption that BPSK modulation is performed.
  • the non-singing code non-execution area S1 includes the unique word described above.
  • the base station apparatus 20 acquires communication data by receiving input of the communication frame as described above from a communication data processing unit (not shown).
  • This communication frame includes the areas SI, S2, and S3 as described above.
  • the switch unit 100a outputs the communication data related to the regions S1 and S2 to the differential encoding unit 102a and the communication data related to the region S3 to the modulation unit 104a.
  • a configuration for transmitting communication data related to region S1 will be described with reference to a diagram illustrating an example of processing of communication data S1 related to region S1 illustrated in FIG.
  • Modulation section 104a performs phase modulation on the input processed communication data based on the phase determined by phase control section 107, and generates a radio signal that is a symbol string.
  • the wireless signal generated in this way is input to the wireless transmission unit 106 via the switch unit 105.
  • the wireless transmission unit 106 transmits the input wireless signal from the antenna.
  • the power shown in the figure is assumed to be one here, for example, a plurality of radio transmitting units 106 may be used.
  • the switch unit 105 inputs the radio signal to the radio transmission unit 106 that should transmit the radio signal input in accordance with an instruction from a control unit (not shown).
  • the differential code key unit 102a generates the differential code key communication data by performing the above-described differential code key on the input communication data S2, thereby generating a differential code key data unit. Enter in 103.
  • the Hamming code unit 103 adds a Hamming code to the differentially encoded communication data.
  • a Hamming code is used as an error correction code
  • other error correction codes such as a cyclic redundancy code (CRC) may be used.
  • the communication apparatus uses a ming code in order to restore the bit inverted by the bit inversion.
  • the ming code can correct 1-bit errors, but cannot correct 2-bit errors.
  • a 1-bit error becomes a 2-bit error due to differential decoding, so that a conventional hamming code that can correct only a 1-bit error cannot be corrected.
  • the communication data S2 which is a part of the communication data, cannot be corrected by correcting the 1-bit error in the radio area even though the differential code is used. It can be corrected with a Hamming code.
  • each of the base station device 20 and the mobile station device 30 stores a Hamming code key table in which communication data and a Hamming code are associated with each other.
  • the base station apparatus 20 stores a hamming code key table in the ming code key unit 103.
  • FIG. 7 shows an example of this ming code table. As shown in the figure, a bit string and a bit string (a bit string after a hamming code) obtained by humming the bit string are stored in association with each other in the ming code table.
  • the ming code unit 103 divides the input differentially encoded communication data into bit string lengths stored in the hamming encoding table, and each corresponds to the hamming code table. It is replaced with the bit string that is stored in addition and stored with the ming code. In this manner, the Hamming code key unit 103 generates Hamming-encoded differentially encoded communication data. The Hamming encoder 103 then inputs the generated Hamming-encoded differentially encoded communication data to the modulator 104a as processed communication data.
  • Modulation section 104a modulates the input processed communication data to generate a radio signal.
  • the generated radio signal is input to the radio transmission unit 106 via the switch unit 105.
  • the line transmission unit 106 transmits the input radio signal from the antenna.
  • Modulation section 104a handles input communication data S3 as processed communication data. Then, the input processed communication data is modulated to generate a radio signal. Since region S3 is an adaptive modulation scheme, the modulation scheme used in modulation section 104a is appropriately changed according to the state of the radio signal. The generated radio signal is input to the radio transmission unit 106 via the switch unit 105. The wireless transmission unit 106 transmits the input wireless signal from the antenna.
  • the base station apparatus 20 transmits a communication frame.
  • FIG. 9 is a functional block diagram showing functional blocks of the mobile station device 30.
  • the mobile station device 30 includes a radio reception unit 200, a switch unit 201a, a synchronous detection unit 202a, a correlation acquisition unit 203a, a phase estimation unit 204a, a phase compensation unit 205a, a Hamming decoding unit 206a, A differential decoding unit 207 and a switch unit 208a are included.
  • Radio receiving section 200 receives a radio signal arriving at the antenna, and inputs the signal to synchronous detection section 202a via switch section 201a.
  • the synchronous detection unit 202a performs synchronous detection on the input wireless signal to generate reception data.
  • the received data generated here should be the processed communication data if the radio signal is received without undergoing phase rotation!
  • the mobile station device 30 needs to confirm whether the received data is transmitted by the base station device 20 or not. Therefore, the wireless reception unit 200 inputs the generated reception data to the correlation acquisition unit 203a.
  • the correlation acquisition unit 203a stores a unique word (differential code key unique word) that has been differentially coded. Then, by calculating the cross-correlation between the differential code key unique word and the input received bit string, the differential code key unique word included in the received data bit string is detected.
  • phase estimation unit 204a since there is a possibility of being subjected to phase rotation as described above, this embodiment Then, a differential code key unique word received when subjected to phase rotation is also stored. Then, the cross-correlation between the differential code key unique word and the bit string that is the input received data is also calculated. Then, information indicating the differential code key unique word determined to be included in the bit string that is the received data input based on the cross-correlation calculation result is output to the phase estimation unit 204a.
  • the phase estimation unit 204a associates and stores the phase rotation amount and the differential code key unique word received when the phase rotation indicated by the phase rotation amount is received. Then, the phase rotation amount stored in association with the information indicating the differential code key unique word input from the correlation acquisition unit 203a is read. By doing so, the phase estimation unit 204a determines that the received data is subjected to the phase rotation of the read phase rotation amount, and estimates the phase rotation amount. Then, the phase estimation unit 204a outputs the estimated phase rotation amount to the phase compensation unit 205a.
  • Correlation acquisition section 203a also determines that the received data is processed communication data when differential code key unique word is detected, and detects correlation received by synchronous detection section 202a and switch section 201a. The reception data is notified of the processed communication data and the reception timing. Furthermore, correlation acquisition section 203a outputs the content of the last bit of the differential code unique word included in the detected processed communication data to phase estimation section 204a. Further, based on the detected position of the differentially encoded unique word in the received data, a portion corresponding to the region S1 including the unique word is extracted from the processed communication data and output to the differential decoding unit 207.
  • the switch unit 201a When notified from the correlation acquisition unit 203a that the received data is processed communication data, the switch unit 201a generates a communication frame region S2, S3 from the radio signal based on the notified reception timing. Are extracted, and the output destination corresponding to each is determined. In the present embodiment, switch unit 201a outputs all to synchronous detection unit 202a.
  • the synchronous detection unit 202a performs synchronous detection processing corresponding to each region of the communication frame input from the switch unit 201a. That is, as described above, a process of replacing the symbol of the radio signal with a bit is performed. Then, the processed communication data subjected to synchronous detection is output to the phase compensation unit 205a.
  • the configuration for receiving the communication data related to each area will be described with reference to the diagrams showing examples of processing of the communication data related to each area shown in each figure of FIGS. To do.
  • Correlation acquisition section 203a outputs processed communication data corresponding to region S1 to differential decoding section 207.
  • the processed communication data after being synchronously detected by the synchronous detection unit 202a may be rotated in phase, and are shown as processed communication data A and processed communication data B in FIG. .
  • the differential decoding unit 207 differentially decodes the input processed communication data to generate communication data S1. In this differential decoding, the same result is output regardless of whether the processed communication data is the processed communication data A or the processed communication data B.
  • the differential decoding unit 207 outputs the generated communication data S1 to the switch unit 208a, and the switch unit 208a generates a communication frame based on communication data S2 and S3 described later, which is not illustrated. Output to the data processor.
  • the communication data S2 will be described.
  • the phase of the processed communication data corresponding to the region S2 input from the synchronous detection unit 202a to the phase compensation unit 205a is rotating. That is, if the phase is not rotated, the processed communication data A shown in FIG. 6 is obtained, and if the phase is rotated, the processed communication data B shown in FIG. 6 is obtained. Therefore, the phase compensation unit 205a performs phase compensation on the processed communication data based on the phase rotation amount input from the phase estimation unit 204a. That is, the phase compensation unit 205a reversely rotates the processed communication data by the amount of phase rotation indicated by the input phase rotation amount.
  • the phase compensation unit 205a performs phase compensation on the processed communication data.
  • the phase compensation unit 205a outputs the processed communication data subjected to phase compensation to the hamming decoding unit 206a.
  • the Hamming decoding unit 206a stores a Hamming code table. This node code table is the same as that stored in the base station apparatus 20.
  • the ming decoding unit 206a is configured to store the input processed communication data in the hamming code key table and the length of the bit string after the ming code key is stored. Then, each bit string is replaced with a bit string stored in association with the ming code table. In this manner, the node decoding unit 206a performs the Hamming decoding process on the processed communication data.
  • This node decoding data is differential code communication data.
  • the decoding decoder unit 206a inputs the differential code communication data to the differential decoding unit 207.
  • the differential decoding unit 207 differentially decodes the input differentially encoded communication data to generate communication data S2. Then, the differential decoding unit 207 outputs the generated communication data S2 to the switch unit 208a.
  • phase compensation unit 205a obtains communication data S3 by performing phase compensation even if the processed communication data has been processed, and outputs the communication data S3 to the switch unit 208a.
  • the communication data S2 is differentially signed, a bit error occurring in the communication path can be corrected with the same number of error bits as the number of error bits. It can be corrected with possible error correction codes. Further, even when phase rotation occurs in the communication path, the mobile station device 30 can perform hamming decoding before the differential code.
  • the second embodiment of the present invention is characterized by the mobile station device 30. That is, in the mobile station device 30, synchronous detection is performed in the first embodiment, whereas in the second embodiment, delayed detection is performed on the communication data S1 and the communication data S2.
  • the mobile station device 30 performs differential decoding while acquiring each bit of the processed communication data by synchronously detecting each symbol of the radio signal. For this reason, Data output as a result of the delay detection is data obtained by performing synchronous detection and differential decoding in this order (hereinafter referred to as communication data after delay detection).
  • a functional block diagram of the base station apparatus 20 is shown in FIG. 3 as in the first embodiment.
  • the work word is different from the first embodiment.
  • the correlation acquisition unit 203b described later calculates a correlation with a unique word that has already been differentially decoded. The amount of phase rotation cannot be acquired based on the correlation result. Therefore, in the second embodiment, as in the case where the above-described differential encoding is not performed, it is decided to use a unique word in which a predetermined absolute phase symbol has a predetermined absolute phase. More specifically, it is decided to use a unique word such that an absolute phase symbol obtained by modulating a predetermined absolute phase corresponding bit (for example, the last bit of the unique word) has a predetermined absolute phase. In this way, the mobile station device 30 tries to acquire an absolute phase symbol to which an absolute phase is assigned!
  • the mobile station device 30 confirms whether or not the phase is rotating by confirming the phase of the symbol at the predetermined position. If it is rotating, phase compensation is performed by correcting the phase of the communication signal.
  • FIG. 10 is a functional block diagram of mobile station apparatus 30 in the present embodiment.
  • mobile station apparatus 30 includes radio receiving section 200, switch section 20 lb, synchronous detection section 202b, correlation acquisition section 203b, phase estimation section 204b, phase compensation section 205b, , A ming decoding unit 206b, a switch unit 208b, a delay detection unit 210, a differential coding unit 211, and a differential decoding unit 212.
  • radio reception section 200 receives a radio signal arriving at the antenna. And it inputs into the delay detection part 210 via the switch part 201b.
  • the delay detection unit 210 performs delay detection on the input radio signal to generate reception data. Then, the delay detection unit 210 inputs the generated reception data to the correlation acquisition unit 203b.
  • the correlation acquisition unit 203b stores the unique word as it is, and calculates the cross-correlation between the stored unique word and the bit string that is the input received data, thereby obtaining the bit string that is the received data. Detect unique words included. [0082] Then, when the unique word can be detected, the correlation acquisition unit 203b determines that the received data is communication data after delay detection, and the received data is delayed with respect to the delay detection unit 210 and the switch unit 201b. Notify that it was communication data after detection and its reception timing. Further, the correlation acquisition unit 203b detects an absolute phase corresponding bit (for example, the last bit of the unique word) based on the detected unique word.
  • the correlation acquisition unit 203b acquires absolute phase information indicating the phase of the absolute phase symbol corresponding to the absolute phase corresponding bit, and outputs the absolute phase information to the phase estimation unit 204b. Further, based on the detected position of the unique word in the received data, the portion corresponding to the area S1 including the unique word is extracted from the communication data after delay detection, and is output to the switch unit 208b.
  • the phase estimation unit 204b stores the absolute phase. Then, the amount of phase rotation is calculated based on the absolute phase indicated by the absolute phase information input from the correlation acquisition unit 203b and the stored absolute phase. By doing so, the phase estimation unit 204b determines that the received data is subjected to the phase rotation of the calculated phase rotation amount, and estimates the phase rotation amount. Then, the phase estimation unit 204b outputs the estimated phase rotation amount to the phase compensation unit 205b.
  • the switch unit 201b When the switch unit 201b is notified from the correlation acquisition unit 203b that the received data is communication data after delay detection, the switch unit 201b generates a communication frame region S2, from the radio signal based on the notified reception timing. S3 is extracted and the output destination corresponding to each is determined. In the present embodiment, the switch unit 201b outputs the region S2 to the delay detection unit 210 and the region S3 to the synchronous detection unit 202b.
  • Delay detection section 210 performs a delay detection process on region S2 of the communication frame input from switch section 201b. Then, the communication data after delay detection obtained by delay detection is output to the phase compensation unit 205b.
  • Synchronous detection section 202b performs synchronous detection processing on region S3 of the communication frame input from switch section 201b. Then, the processed communication data subjected to synchronous detection is output to the phase compensation unit 205c. For this processed communication data, the phase compensation for the processed communication data is performed in the phase compensation unit 205c as in the first embodiment. Then, the position compensation unit 205c acquires the communication data S3 and outputs it to the switch unit 208b. [0087]
  • a configuration for receiving communication data related to region SI and region S2 will be described with reference to diagrams illustrating examples of processing of communication data related to each region illustrated in each diagram of FIG. 11 and FIG. To do.
  • the communication data S1 will be described. Since the delayed detection includes differential decoding, the same result is output even if the received signal is shifted from the received signal A or B as shown in FIG. Since the communication data S1 has already been subjected to differential decoding after the delay detection, the communication data after the delay detection is the communication data S1. For this reason, the correlation acquisition unit 203b outputs the communication data after delay detection as it is to the switch unit 208b as communication data S1. The switch unit 208b generates a communication frame based on communication data S2 and S3, which will be described later, and outputs it to the data processing unit, not shown.
  • the phase compensation unit 205b performs phase compensation on the processed communication data corresponding to the input communication data S2. In other words, even after delay detection, the phase of the leading bit remains phase-rotated, and phase compensation of the leading bit is performed.
  • the power that is the deviation of the communication data A after delay detection or the communication data B after delay detection is uncertain! /.
  • the processed communication data affected by the phase rotation is output in the differential code key 211 in the next-stage differential code key unit 211.
  • the phase compensation unit 205b performs phase compensation according to the phase rotation of the first bit. Then, the phase compensation unit 205b acquires post-phase compensation post-delay detection communication data and outputs it to the differential code unit 211.
  • the differential encoding unit 211 generates processed communication data by differentially encoding the input post-phase compensation post-delay detection communication data. That is, since differential decoding has been performed by delay detection, the differential encoding unit 211 performs differential encoding again. At this time, since the phase of the first bit is compensated by the phase compensation unit 205b, the differential encoding unit 211 can obtain the same processed communication data as the processed communication data generated by the base station device 20. it can. Then, the differential code unit 211 outputs the generated processed communication data to the hamming decoding unit 206b.
  • the ming decoding process performed in the ming decoding unit 206b is the same as that performed in the ming decoding unit 206a.
  • the ming decoding unit 206b differentially transmits the differentially encoded communication data generated by the hamming decoding process. The data is input to the decryption unit 212.
  • Differential decoding section 212 performs differential decoding similar to that of differential decoding section 207 on the input differential encoded communication data, and generates communication data S2. Then, differential decoding section 212 outputs generated communication data S2 to switch section 208b.
  • differential encoding is performed once after delay detection, error correction decoding is performed, and then differential decoding is performed again. Therefore, it is possible to correct the bit error of the processed communication data that has occurred in the communication path with an error correction code that can correct the same number of error bits as the number of error bits.
  • the mobile station device 30 can perform error correction decoding before the differential decoding. It ’s like this.
  • Embodiment 3 of the present invention is characterized by the base station device 20, and the mobile station device 30 can be the same as that of Embodiment 1 or Embodiment 2.
  • the base station apparatus 20 performs the differential encoding and the Hamming encoding of the communication data S2 in this order.
  • other processed communication data that can acquire processed communication data obtained by performing the differential code ⁇ and Hamming code ⁇ of communication data S2 in this order. Use a generation method.
  • a quasi-hamming encoding process is performed instead of the no and ming code process.
  • the transmitting side transmission apparatus stores a quasi-hamming code key table instead of the hamming code key table.
  • FIG. 13 shows an example of the quasi-Humming code key table. As shown in the figure, in the quasi-hamming code table, a bit string and a bit string obtained by quasi-hamming code of the bit string (a bit string after the quasi-hamming code) are stored in association with each other.
  • bit string after the quasi-Hamming code the data obtained when the bit string after the quasi-Hamming code is subjected to the differential code is stored in association with the bit string after the humming code.
  • Bit A bit string is stored so that the differential code key and the error correction code key are applied in this order to the data string.
  • the base station apparatus 20 divides the input communication data into bit string lengths stored in the quasi-Hamming code table, and replaces each with a bit string after the quasi-Hamming code table.
  • the base station apparatus 20 By performing differential encoding on the quasi-Hamming code communication data obtained in this way, the base station apparatus 20 generates the same processed communication data as when Hamming encoding is performed after differential encoding. . In this way, the bit string after the quasi-Hamming code is used as generation data for generating processed communication data.
  • base station apparatus 20 for realizing this processed communication data generation method will be described below.
  • FIG. 14 is a functional block diagram showing functional blocks of the base station apparatus 20 in the present embodiment.
  • the base station apparatus 20 includes a switch unit 100b, a differential encoding unit 102b, a modulation unit 104b, a switch unit 105, a radio transmission unit 106, a phase control unit 107, and a quasi-hamming encoding unit 108. Consists of including.
  • the functions of the switch unit 105, the wireless transmission unit 106, and the phase control unit 107 are the same as those in the first embodiment.
  • the switch unit 100b relates the communication data related to the region S1 to the differential encoding unit 102b, the communication data related to the region S2 to the quasi-hamming code control unit 108, and the related to the region S3. Communication data is output to modulation section 104b.
  • the configuration for transmitting communication data related to areas S1 and S3 is the same as that in the first or second embodiment.
  • the configuration for transmitting communication data related to area S2 will be described below.
  • the semi-hamming code key unit 108 stores the above-described semi-hamming code key table, and performs the above-described semi-hamming code key processing on the input communication data S2. Then, the quasi-hamming code key unit 108 outputs the quasi-hamming code key communication data obtained as a result to the differential code key unit 102b.
  • the differential code unit 102b performs the differential code on the input forward Hamming code communication data. As a result, the differential encoding unit 102b generates the same processed communication data as in the case of Hamming encoding after differential encoding in the first embodiment. And the differential mark The signal input unit 102b inputs the generated processed communication data to the modulation unit 104b.
  • the processed communication data transmitted from the base station device 20 is the same as that of the first embodiment, and therefore, the mobile station device 30 has the configuration of the base station device 20. Regardless, each process related to reception of processed communication data can be performed with the same configuration. On the other hand, in the base station device 20, it is not necessary to perform error correction coding after differential coding! Therefore, the device configuration can be simplified.
  • the correlation acquisition unit 203a stores the unique word in the differentially signed state, and instead stores the unique word in a state where the differentially signed key is not stored and calculates the correlation every time the correlation is calculated. It may be a dynamic code.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Detection And Correction Of Errors (AREA)
  • Error Detection And Correction (AREA)

Abstract

Dans un système de communication employant un traitement de modulation pour réaliser un codage différentiel, une erreur de bit de données de communication générée dans une route de communication est corrigée par un code de correction d’erreur pouvant corriger le même nombre de bits erronés que le nombre de bits d’erreur. Un dispositif de station de base génère des données traitées de communication en tant que partie traitée soumise au codage différentiel et au codage de traitement d’erreur, dans cet ordre, par un processus de génération prédéterminé pour la partie devant être traitée qui est au moins une partie des données de communication en tant qu’objet de communication. Le dispositif de station de base transmet les données de communication traitées générées. Un dispositif de station mobile reçoit les données de communication traitées qui ont été transmises, acquiert des données décodées corrigées obtenues par correction d’erreur et décodage de la partie traitée parmi les données de communication traitées reçues et soumet les données décodées corrigées au décodage différentiel.
PCT/JP2006/303481 2005-02-24 2006-02-24 Système de communication, dispositif de communication, méthode de correction d’erreur et programme de contrôle de communication WO2006090856A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8315200B2 (en) 2007-03-05 2012-11-20 Sony Corporation Transmission device, transmission method, reception device, and communication system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5116567B2 (ja) * 2008-06-05 2013-01-09 三菱電機株式会社 光受信装置
JP5682458B2 (ja) * 2011-06-06 2015-03-11 富士通株式会社 データ送受信システム

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49106708A (fr) * 1973-02-12 1974-10-09
JPH05199270A (ja) * 1992-01-23 1993-08-06 Toshiba Corp ディジタルマイクロ波無線装置
JP2000036763A (ja) * 1998-07-16 2000-02-02 Matsushita Electric Ind Co Ltd 誤り訂正回路
JP2003283454A (ja) * 2002-03-26 2003-10-03 Toshiba Corp Ｏｆｄｍ受信装置およびｏｆｄｍ受信装置におけるデータ復調方法
JP2004032432A (ja) * 2002-06-26 2004-01-29 Matsushita Electric Ind Co Ltd 受信装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49106708A (fr) * 1973-02-12 1974-10-09
JPH05199270A (ja) * 1992-01-23 1993-08-06 Toshiba Corp ディジタルマイクロ波無線装置
JP2000036763A (ja) * 1998-07-16 2000-02-02 Matsushita Electric Ind Co Ltd 誤り訂正回路
JP2003283454A (ja) * 2002-03-26 2003-10-03 Toshiba Corp Ｏｆｄｍ受信装置およびｏｆｄｍ受信装置におけるデータ復調方法
JP2004032432A (ja) * 2002-06-26 2004-01-29 Matsushita Electric Ind Co Ltd 受信装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8315200B2 (en) 2007-03-05 2012-11-20 Sony Corporation Transmission device, transmission method, reception device, and communication system

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