WO2006093286A1 - 無線通信装置 - Google Patents
無線通信装置 Download PDFInfo
- Publication number
- WO2006093286A1 WO2006093286A1 PCT/JP2006/304139 JP2006304139W WO2006093286A1 WO 2006093286 A1 WO2006093286 A1 WO 2006093286A1 JP 2006304139 W JP2006304139 W JP 2006304139W WO 2006093286 A1 WO2006093286 A1 WO 2006093286A1
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- WIPO (PCT)
- Prior art keywords
- wireless communication
- signal
- error correction
- correction decoding
- error
- Prior art date
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Classifications
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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
- H04L1/0045—Arrangements at the receiver end
- H04L1/0054—Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
- H04L25/067—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing soft decisions, i.e. decisions together with an estimate of reliability
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L2001/0092—Error control systems characterised by the topology of the transmission link
- H04L2001/0097—Relays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
Definitions
- the present invention relates to a wireless communication apparatus having a function of relaying a signal transmitted from a transmitting station to a receiving station.
- FIG. 12 shows a schematic configuration of a conventional wireless communication device (hereinafter referred to as a relay station or a repeater) 123.
- the conventional relay station 123 corrects and decodes a reception antenna 41 that receives radio waves from a transmission station (not shown), a reception RF unit 42 that amplifies the received signal at a high frequency, and a signal error that has occurred in the propagation path.
- An error correction decoding unit 43 a hard decision unit 121, 122 for judging a signal error by “0” or “1”, an error detection unit 44 for detecting an error of a signal subjected to hard decision processing, and a hard decision unit 121 , 122 for switching output, re-encoding unit 46 for re-encoding the signal output from switching unit 45, transmission RF unit 47 for high-frequency amplification of the re-encoded signal, and high-frequency signal Is transmitted to a receiving station (not shown).
- Such conventional repeater 123 performs error correction decoding processing (turbo code, convolutional code, LDPC code (low density parity check codes), etc.) on the received signal. Then, error detection processing is performed on the hard decision bits after error correction decoding (the bit string obtained as a result of error correction by “hard decision” for the received signal).
- error correction decoding processing turbo code, convolutional code, LDPC code (low density parity check codes), etc.
- the error-corrected decoded bit (hard decision bit) is error-correction-encoded again and relay-transmitted.
- the error-corrected decoded bit (hard decision bit) is error-correction-encoded again and relay-transmitted.
- relay transmission is not performed, or hard decision bits before error correction decoding are relayed.
- the signal after error correction decoding processing has a value of "1” or "1". For example, the value changes from “1” to “1” and from “1” to "0".
- a bit sequence converted to “0” and “1” is called a bit after error correction decoding, and error detection processing is performed on this bit after error correction decoding (see, for example, non-patent literature) .
- Non-Patent Document 1 Cooperation using STBC in multi-hop communication between single-antenna terminals ⁇ Method: IEICE Technical Report Technical Report of IEICE. WBS2003-149, A-P2003 -342, RCS2003-365 MoMuC2003-143, MW2003-311 (2004-03)
- the error correction decoding process requires a large number of repetitive operations in the process, and thus consumes various resources (power, CPU power, etc.) in the relay station. For this reason, if relay transmission is not performed, resources spent for error correction decoding are wasted.
- the error correction decoding process performs a process of improving the reliability of a received signal and reducing (correcting) errors.
- the conventional method if the error remains even 1 bit after error correction processing, relay transmission is not performed, and the improved reliability is wasted.
- the present invention has been made in view of the above-described conventional circumstances, and does not waste a consumed resource, and also enables flexible error correction while maintaining an increase in reliability due to error correction.
- Means for solving the problem For the purpose of providing a wireless communication device.
- the wireless communication apparatus of the present invention performs error correction decoding processing on the received signal and transmits a soft decision value obtained by re-encoding the signal after error correction decoding processing as a relay signal.
- the hard decision value is a decision value such as bit (0, 1), and since the bit is treated as “1” and “one 1” in radio, the hard decision value in the radio is It will be either "1" or "-1".
- the soft decision value is a decision value having an intermediate value (for example, 0.55) that is not “1” or “1”.
- the wireless communication device of the present invention performs relay transmission using a soft decision value obtained by re-encoding the signal after error correction decoding processing as a relay signal. Do. In this case, if there is no error in the hard decision bit, it is useless to send the soft decision value. In this case, the soft decision value is not sent. However, if a special solution (binary value) with a reduced soft decision stage is positioned as a hard decision, the soft decision value can be sent.
- the reliability of the signal after error correction decoding processing is higher than that of the hard decision bit before error correction decoding processing.
- a relay signal can be transmitted. This increases the possibility that the final receiver can receive the signal correctly.
- the soft decision value can be used as it is, the overall calculation time can be shortened.
- the wireless communication device of the present invention extracts a soft decision value from the signal power during the error correction decoding process and detects the soft decision value when an error is detected in the hard decision bit after error correction decoding.
- Relay transmission is performed using the re-encoded signal as a relay signal. In this case, if an error is not detected, the bit after error correction decoding is re-encoded and transmitted as before. A re-encoded version of a signal with no errors becomes a complete signal at the time of relay transmission with the highest bit reliability.
- a signal with improved reliability by error correction decoding processing can be transmitted, so that the possibility that the receiving station can correctly receive the signal can be increased.
- the resources consumed by the relay station can be used effectively. Since the processing performed at the relay station produces an “increase in reliability”, the resources consumed at the relay station are not wasted.
- the wireless communication apparatus of the present invention can be used in accordance with the error correction decoding processing capability of the receiving station.
- the number of iterations can be changed, the number of iterations is reduced when the error correction decoding processing capability of the receiving station is high, and the number of iterations is increased when the error correction decoding processing capability of the receiving station is low.
- the throughput of the entire system can be improved.
- the number of repeater error correction decoding processes it becomes possible for one repeater to relay signals for a plurality of recipients, thus improving the throughput of the entire system. it can.
- the wireless communication device of the present invention is a wireless communication device having a function of relaying a signal transmitted from a transmitting station to a receiving station, and means for receiving a signal from the transmitting station, Means for performing error correction decoding processing of the signal, means for performing hard decision processing on the signal after error correction decoding processing, means for performing error detection of the signal subjected to hard decision processing, and an error in the signal subjected to hard decision processing
- the means for extracting the soft decision value extracts the soft decision value based on the number of iterations.
- the means for extracting the soft decision value extracts the soft decision value based on the iteration time.
- the means for performing the error correction decoding process repeats the means for calculating the bit likelihood of the received signal and the process for repeatedly processing the received signal to correct an error. Processing means, and means for converting the bit likelihood in the signal in the middle of the iterative processing into a soft decision value.
- the iterative processing means decodes the received signal.
- a first decoder that decodes an interleaver that rearranges the output data of the first decoder, a second decoder that decodes the output of the interleaver, and rearranges the output data of the second decoder, A dintariba returning to the i-th decoder.
- the radio communication apparatus of the present invention further includes means for determining the number of iterations according to the error correction decoding processing capability at the receiving station.
- the wireless communication apparatus of the present invention is configured such that when the means for determining the number of iterations is based on the number of iteration indication information transmitted from the receiving station and the error correction decoding processing capability of the receiving station is high, The number of iterations is reduced, and the number of iterations is increased when the error correction decoding processing capability of the receiving station is low.
- the final receiver can enjoy the data reliability improvement effect by the error correction decoding process in the repeater, even if an error is detected after the error correction decoding process in the repeater, the final receiver The error rate characteristics at the receiver can be improved.
- the load of error correction decoding processing at the final receiver can be reduced as compared with the conventional method as compared with the conventional method under the condition that the required condition of the error rate at the final receiver is constant.
- the reason is that the reliability of the bit is increased at the relay station, so that the error correction decoding process necessary for the final receiver to satisfy the desired error rate must be obtained, and the bit reliability gain is increased. This is because it can be made smaller than before.
- FIG. 1 is a system configuration diagram of a radio communication apparatus (relay station) for explaining an embodiment of the present invention.
- FIG. 5 is a schematic block diagram of the error correction decoding unit 43 in the wireless communication apparatus of this embodiment.
- ⁇ 6] Explanatory diagram in which data reliability is increased by error correction decoding repetition.
- FIG. 1 shows a system configuration diagram of a wireless communication apparatus (relay station) for explaining an embodiment of the present invention.
- the signal transmitted from the transmitting station 11 is relayed by the wireless communication device (relay station) 12 and transmitted to the final receiving station 13.
- FIG. 2 shows a schematic block diagram of the transmitting station 11.
- the transmission data is subjected to error correction coding in the error correction coding unit 21 of the transmission station 11, and the signal after error correction coding is modulated in the transmission RF unit 22 and transmitted from the transmission antenna 23 to the relay station.
- the signal after error correction coding is modulated in the transmission RF unit 22 and transmitted from the transmission antenna 23 to the relay station.
- FIG. 3 shows a schematic block diagram of the final receiving station 13.
- the radio wave transmitted from the relay station is received by the receiving antenna 31, demodulated by the reception RF unit 32, and input to the error correction decoding unit 33.
- the error correction decoding unit 33 performs error correction processing on the received signal, and the signal after the error correction processing is hard-decided by the hard decision unit 34 and converted into information of “1” and “1”. After that, the bit is judged and “0” and “1” data are output as received data.
- FIG. 4 is a schematic block diagram of the wireless communication device (relay station) 12 of the present embodiment.
- the wireless communication device (relay station) 12 performs a reception antenna 41 that receives a signal transmitted from a transmission station, a reception RF unit 42 that amplifies the received signal at a high frequency, and performs error correction decoding processing on the received signal, An error correction decoding unit 43 that outputs a soft decision value and a decoded bit; an error detection unit 44 that performs a hard decision process on the signal after the error correction decoding process and detects an error of the signal subjected to the hard decision process; and a soft decision value A switching unit 45 that switches between decoding bits, a re-encoding unit 46 that re-encodes the extracted soft decision value, a transmission RF unit 47 that modulates the re-encoded soft decision value, and a signal transmitted to the receiving station A transmitting antenna 48;
- error correction decoding processing is performed on the received signal! Performs hard decision processing on the post-sign signal and generates hard decision bits to detect errors (for example, CRC (Cyclic Redundancy Check) can be used for error detection). If there is no error in the hard decision signal, the hard decision bit after error correction decoding is re-encoded, modulated by the transmission RF unit 47, and transmitted. If there is an error in the hard decision signal, the soft decision value is extracted from the signal strength after the error correction decoding process, the soft decision value is re-encoded, modulated by the transmission RF unit 47, and transmitted.
- CRC Cyclic Redundancy Check
- FIG. 5 shows a schematic block diagram of the error correction decoding unit 43 in the wireless communication apparatus of the present embodiment.
- This block diagram shows a block diagram of turbo code decoding processing.
- the error correction decoding unit 43 includes a bit likelihood calculating unit 51 that calculates a bit likelihood (likelihood) that is a probability of correctness of data, a decoder 1 (52) that decodes a signal, and an input continuous sequence.
- Interleaver 54 that divides the data into different blocks and rearranges it, Decoder 2 (55) that further decodes the output of interleaver 54, Deinterleaver 53 that returns the rearranged data to the original order, and Decoder 2 ( The likelihood of extracting a soft decision value from the output of 55) and outputting the soft decision value 56, and a hard decision unit 57 that performs a hard decision based on the output of the decoder 2 (55) and outputs a decoded bit. Prepare.
- the received signal is repeatedly processed to correct errors.
- the received signal is decoded by decoder 1 (52), the data is rearranged by interleaver 54, and then decoded by decoder 2 (55).
- the deinterleaved signal is decoded again by decoder 1 (52).
- Figure 6 shows how data reliability is improved by repeating this iteration. In the case of a turbo code, iteration is usually performed about 5 times.
- iteration is an iterative process, and signal reliability can be improved by repeating calculations.
- reliability increases, but error correction decoding processing takes time, so the maximum number of iterations is usually determined.
- iteration is performed about 5 times, the effect of increasing reliability is reduced in subsequent iterations, so it is generally repeated up to 5 times.
- FIG. 7 shows a comparison between the soft decision value and the hard decision value. If the hard decision value is greater than “0”, If it is less than “+ 1” or “0”, it is judged as “-i”, whereas the soft decision value takes a value after the decimal point.
- FIG. 8 shows a comparison between this embodiment and the conventional method related to data reliability when there is an error in the signal after error correction decoding of the relay station.
- the signal is highly reliable because there is no error in the transmitted signal.
- the signal is transmitted wirelessly from the transmitting station to the relay station, the signal is transmitted along the propagation path. Reliability deteriorates.
- the relay station of this embodiment re-encodes and transmits the soft decision value of the signal after error correction decoding, so that the relay station increases the reliability of data. It is possible to relay the improved signal.
- the conventional relay station re-encodes and transmits the hard decision value of the signal before error correction decoding. Cannot be improved.
- the reliability of the received signal can be improved by the error correction decoding process of the final receiving station, so that errors can be eliminated.
- a relay station of the type even if error correction decoding processing is performed at the final receiving station, the reliability of data cannot be recovered until the error can be completely removed, so that an error remains.
- FIG. 9 shows a system configuration diagram of the wireless communication apparatus (relay station) according to the second embodiment of the present invention.
- the data channel transmitted from the transmitting station 11 is relayed by the wireless communication device (relay station) 103 and transmitted to the final receiving station 13.
- the relay station 103 hateation number indication information is transmitted from the final receiving station 13.
- FIG. 10 shows a schematic block diagram of the wireless communication apparatus (relay station) 103 of the present embodiment.
- the wireless communication device (relay station) 103 includes a reception antenna 41 that receives a signal transmitted from a transmission station, a reception RF unit 42 that amplifies the received signal at a high frequency, and an iteration from the received signal.
- Iteration number indication information detection unit 101 that detects the number of indication instructions, iteration number decision unit 102 that determines the number of iterations, and error correction decoding processing of the number of iterations determined for the received signal are performed!
- An error correction decoding unit 43 that outputs a decoded bit, an error detection unit 44 that performs a hard decision process on the signal after the error correction decoding process and detects an error of the signal subjected to the hard decision process, and a soft decision value and a decoded bit
- a re-encoding unit 46 that re-encodes the extracted soft decision value, a transmission RF unit 47 that modulates the re-encoded soft decision value, and a transmission antenna 48 that transmits the signal to the receiving station.
- the iteration number instruction information is notified from the final receiving station 13, so the number of iterations is controlled so that error correction decoding processing is performed at the designated number of times. To do.
- FIG. 11 shows the distribution of the number of iterations in the present embodiment.
- the processing capacity of the receiving station is high, that is, when error correction decoding processing can be performed at high speed, the number of iterations at the receiving station is large.
- the processing capacity of the receiving station is low, the number of iterations at the receiving station is reduced.
- the number of iterations of the relay station is controlled according to the processing capability of the receiving station. As shown in Fig. 11, for example, when the processing capacity of the receiving station is high (when 8 iterations are possible), the number of iterations from the receiving station to the relay station so that the number of iterations at the relay station is 2. Send instruction information.
- the number of iterations at the relay station is five, and when the processing capacity of the receiving station is low (two iterations are possible) ), The number of iterations is transmitted from the receiving station to the relay station so that the number of iterations at the relay station is 8. This makes it possible to reduce the relay delay at the relay station while maintaining the quality at the final receiving station.
- the processing time and the processing capacity of the terminal are considered, and relaying is performed by allocating the processing time in the relay station to a plurality of relay processes. It is also possible to increase the number of data that can be generated. For example, if only 1 terminal is relayed with 8 repetitions in the conventional method, 4 terminals are repeated with 2 repetitions. By relaying, the number of data that can be relayed can be increased.
- the wireless communication apparatus described above conventionally, when there is an error in the hard decision bit after repeatedly performing the error correction decoding process, since the signal is not relayed, the reliability is increased by the error correction decoding process. Although it was wasted, by transmitting the soft decision value extracted from the signal in the middle of error correction decoding processing, even if there is an error in the hard decision bit, the error correction decoding is performed at the receiving station. Since the reliability improvement effect by processing can be enjoyed, the error rate characteristics at the receiving station can be improved.
- the radio reception apparatus may adaptively notify the relay station of the number of iterations according to the processing being performed. For example, when a high-definition image is being received at the receiving station, the processing load at the receiving station is large, so notification is given to increase the number of iterations of error correction processing at the relay station.
- the number of iterations at the relay station may be controlled according to the requirements for the quality of the received signal. For example, the processing delay may be very short, but the error rate may be low. VoIP (Voice When receiving (over IP), etc., reduce the number of iterations at the relay station to reduce the relay delay.
- VoIP Voice When receiving (over IP), etc.
- receiving station 1 may be a relay station with an iteration count of 2
- receiving station 2 may be a relay station with an iteration count of 6.
- the receiving station causes the relay station to perform processing and support the iteration, so that the resources of the relay station can be used without waste.
- the relay station power receiving station is notified of the number of iterations that can be processed. Good.
- the receiving station notifies the relay station of the number of iterations desired to be processed within the range of the iteration count notified of the relay station power, and the relay station performs relay processing with the number of iterations specified by the receiving station power. As a result, the resources of the relay station can be used without waste.
- the iteration process in the relay station may be controlled from the mobile station so as to be larger than that in the mobile station.
- the fewer errors that occur in the previous stage the more effective the overall system error rate reduction.
- the number of iterations in the relay station is greater than the number of iterations in the mobile station. Increasing the number of times improves the performance of the entire system.
- the present invention does not waste the consumed resources and flexibly maintains an increase in reliability due to error correction. It has the effect of enabling error correction, and is useful for a wireless communication apparatus having a function of relaying a signal transmitted from a transmitting station to a receiving station.
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- Power Engineering (AREA)
- Artificial Intelligence (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Radio Relay Systems (AREA)
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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JP2007506031A JP4727655B2 (ja) | 2005-03-03 | 2006-03-03 | 無線通信装置 |
EP06728618A EP1855394B1 (en) | 2005-03-03 | 2006-03-03 | Wireless communication apparatus relaying either soft information or hard decoded bits |
US11/817,526 US7787524B2 (en) | 2005-03-03 | 2006-03-03 | Wireless communication apparatus |
US12/841,548 US7945000B2 (en) | 2005-03-03 | 2010-07-22 | Wireless communication apparatus |
Applications Claiming Priority (2)
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JP2005-059245 | 2005-03-03 | ||
JP2005059245 | 2005-03-03 |
Related Child Applications (2)
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US11/817,526 A-371-Of-International US7787524B2 (en) | 2005-03-03 | 2006-03-03 | Wireless communication apparatus |
US12/841,548 Continuation US7945000B2 (en) | 2005-03-03 | 2010-07-22 | Wireless communication apparatus |
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WO2006093286A1 true WO2006093286A1 (ja) | 2006-09-08 |
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PCT/JP2006/304139 WO2006093286A1 (ja) | 2005-03-03 | 2006-03-03 | 無線通信装置 |
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US (2) | US7787524B2 (ja) |
EP (2) | EP2323277A1 (ja) |
JP (2) | JP4727655B2 (ja) |
CN (1) | CN101133568A (ja) |
WO (1) | WO2006093286A1 (ja) |
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JP2009147609A (ja) * | 2007-12-13 | 2009-07-02 | Nippon Telegr & Teleph Corp <Ntt> | 無線通信方法、無線通信システム、および中継局 |
JP2011103667A (ja) * | 2005-03-03 | 2011-05-26 | Panasonic Corp | 無線通信装置及び中継方法 |
JP2011517199A (ja) * | 2008-04-02 | 2011-05-26 | フランス・テレコム | 少なくとも1つの中継器と、対応するプログラム製品および中継デバイスとを使用して、少なくとも2つの送信機と少なくとも1つの受信機間でディジタル信号を送信する方法 |
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- 2006-03-03 JP JP2007506031A patent/JP4727655B2/ja not_active Expired - Fee Related
- 2006-03-03 EP EP06728618A patent/EP1855394B1/en not_active Not-in-force
- 2006-03-03 US US11/817,526 patent/US7787524B2/en active Active
- 2006-03-03 WO PCT/JP2006/304139 patent/WO2006093286A1/ja active Application Filing
- 2006-03-03 CN CNA2006800069867A patent/CN101133568A/zh active Pending
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- 2010-12-10 JP JP2010275405A patent/JP5175919B2/ja not_active Expired - Fee Related
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Cited By (15)
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JP2011103667A (ja) * | 2005-03-03 | 2011-05-26 | Panasonic Corp | 無線通信装置及び中継方法 |
JP4800378B2 (ja) * | 2006-02-28 | 2011-10-26 | パナソニック株式会社 | 無線通信装置および中継送信方法 |
KR101288826B1 (ko) | 2007-04-03 | 2013-07-23 | 삼성전자주식회사 | 릴레이를 포함한 데이터 전송 시스템에서 데이터 오류를제어하는 방법 및 장치 |
JP2009010781A (ja) * | 2007-06-28 | 2009-01-15 | Kenwood Corp | 無線中継装置、無線中継装置の制御方法 |
JP2009147609A (ja) * | 2007-12-13 | 2009-07-02 | Nippon Telegr & Teleph Corp <Ntt> | 無線通信方法、無線通信システム、および中継局 |
JP2011517199A (ja) * | 2008-04-02 | 2011-05-26 | フランス・テレコム | 少なくとも1つの中継器と、対応するプログラム製品および中継デバイスとを使用して、少なくとも2つの送信機と少なくとも1つの受信機間でディジタル信号を送信する方法 |
KR101576816B1 (ko) * | 2008-04-02 | 2015-12-11 | 엥스띠뛰 텔레컴/텔레컴 브레따뉴 | 적어도 하나의 릴레이를 이용하여 적어도 2개의 송신기와 적어도 하나의 수신기 사이에서 디지털 신호를 전송하는 방법 및 대응하는 프로그램 제품과 릴레이 장치 |
JP2016021751A (ja) * | 2008-04-02 | 2016-02-04 | オランジュ | 少なくとも2つの符号の連結を実施する方法、そのコンピュータプログラム、および中継デバイス |
CN101729213B (zh) * | 2008-10-29 | 2013-12-04 | 上海华为技术有限公司 | 一种数据通信方法、装置及系统 |
JP5435027B2 (ja) * | 2009-05-25 | 2014-03-05 | 富士通株式会社 | 中継装置、送信装置、通信システムおよび通信方法 |
US8804600B2 (en) | 2009-05-25 | 2014-08-12 | Fujitsu Limited | Relay apparatus, transmitting apparatus, communication system, receiving apparatus, and communication method |
WO2012120743A1 (ja) * | 2011-03-04 | 2012-09-13 | 三菱電機株式会社 | 中継装置および中継補助装置 |
US9184827B2 (en) | 2011-03-04 | 2015-11-10 | Mitsubishi Electric Corporation | Relay device and auxiliary relay device |
WO2018220675A1 (ja) * | 2017-05-29 | 2018-12-06 | 三菱電機株式会社 | 中継装置および誤り訂正方法 |
JPWO2018220675A1 (ja) * | 2017-05-29 | 2019-06-27 | 三菱電機株式会社 | 中継装置 |
Also Published As
Publication number | Publication date |
---|---|
EP1855394A1 (en) | 2007-11-14 |
EP1855394B1 (en) | 2011-11-09 |
EP2323277A1 (en) | 2011-05-18 |
JPWO2006093286A1 (ja) | 2008-08-07 |
JP5175919B2 (ja) | 2013-04-03 |
JP2011103667A (ja) | 2011-05-26 |
JP4727655B2 (ja) | 2011-07-20 |
CN101133568A (zh) | 2008-02-27 |
US20100284448A1 (en) | 2010-11-11 |
US7787524B2 (en) | 2010-08-31 |
US7945000B2 (en) | 2011-05-17 |
EP1855394A4 (en) | 2009-08-05 |
US20100040119A1 (en) | 2010-02-18 |
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