WO2005109811A1 - 無線通信装置及び無線通信システム - Google Patents
無線通信装置及び無線通信システム Download PDFInfo
- Publication number
- WO2005109811A1 WO2005109811A1 PCT/JP2005/007902 JP2005007902W WO2005109811A1 WO 2005109811 A1 WO2005109811 A1 WO 2005109811A1 JP 2005007902 W JP2005007902 W JP 2005007902W WO 2005109811 A1 WO2005109811 A1 WO 2005109811A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- likelihood
- signal
- variance
- wireless communication
- bit
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0882—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using post-detection diversity
- H04B7/0888—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using post-detection diversity with selection
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/25—Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
- H04B7/0608—Antenna selection according to transmission parameters
Definitions
- the present invention relates to a wireless communication device and a wireless communication system.
- FIG. 1 is a diagram showing the relationship between the ratio of the power per bit of the received signal to the noise power (EbZNO) and the BER (Bit Error Rate).
- the received signal is hard-decided by the maximum likelihood method after demodulation, but as the variance of the likelihood of each bit of the received signal used for the hard decision becomes smaller, as shown in FIG. The rate drops.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2001-244860
- phase shift keying PSK
- quadrature phase shift keying QPSK
- differential phase It is intended for received signals that have been subjected to Differential Phase Shift Keying (DPSK) or Differential Quadrature Phase Shift Keying (DQPSK), with 8 or more PSK or 16 or more quadrature phases.
- DPSK Differential Phase Shift Keying
- DQPSK Differential Quadrature Phase Shift Keying
- QAM Quadrature Amplitude Modulation
- FIGS. 2A to 2C show distribution patterns of likelihood of one symbol of a received signal modulated by 16QAM.
- FIG. 2A shows a distribution pattern of likelihood of a received signal in an ideal receiving state in which the received signal does not include any noise, interference waves, and delayed waves.
- a reception signal modulated by 16QAM has two peaks in the likelihood distribution mode. The reason why the two peaks are formed is that the received signal modulated by 16 QAM is composed of 4 bits, and the criteria for calculating the likelihood differ between the upper 2 bits and the lower 2 bits.
- Fig. 3 shows the constellation of the received signal modulated by 16QAM.
- the likelihood of the upper 2 bits of this received signal is expressed by the distance of the I-axis or Q-axis force. This is because the likelihood of the lower 2 bits is represented by the distance from the central linear force that divides each of the four quadrants in the IQ orthogonal coordinate system. In FIG. 3, only the likelihood on the Q axis is described by simplifying.
- the likelihood and the variance of the likelihood are necessarily calculated for each symbol of the received signal. become.
- the antenna selection diversity technology described in Patent Document 1 for example, when a wireless receiving apparatus having two antenna elements is used, the likelihood of a signal received by antenna element 1 is distributed as shown in FIG. Similarly, the likelihood of the signal received by the antenna element 2 is observed in a distribution manner as shown in FIG. 2C. Therefore, in the antenna selection diversity technology described in Patent Document 1, the variance of likelihood is diffused due to the existence of two peaks in the likelihood distribution of the received signal. Therefore, it becomes difficult to accurately grasp the reception quality of each antenna element, and as a result, it becomes difficult to improve the error rate of a received signal.
- An object of the present invention is to be able to more accurately grasp the reception quality of each antenna element when a wireless signal is received by a plurality of antenna elements, and to improve the error rate of the received signal.
- An object of the present invention is to provide a wireless communication device and a wireless communication system.
- the wireless communication apparatus of the present invention includes a plurality of antenna elements and a plurality of antenna elements for lower-order partial bits of a signal respectively received by the plurality of antenna elements.
- the present invention employs a configuration including a calculating means for calculating the variance of likelihood for each of the antenna elements, and a selecting means for selecting the antenna elements in ascending order of the variance.
- FIG. 1 is a diagram showing bit error rate characteristics of a received signal
- FIG. 2A Diagram showing likelihood distribution of received signal modulated by 16QAM (ideal state)
- FIG. 2B Diagram showing likelihood distribution of received signal modulated by 16QAM (antenna element 1)
- FIG. 2C A diagram showing a likelihood distribution mode of a received signal modulated by 16QAM (antenna element 2)
- FIG. 3 is a diagram showing a constellation of a received signal modulated by 16QAM.
- FIG. 4 is a block diagram showing a configuration of a wireless communication device according to one embodiment of the present invention.
- FIG. 5 is a diagram showing an example of a radio signal frame configuration used in an embodiment of the present invention.
- FIG. 6 is a diagram showing a bit configuration of a received signal used in an embodiment of the present invention.
- FIG. 7A is a diagram showing a distribution pattern of likelihood of lower 2 bits of a received signal according to an embodiment of the present invention (ideal state)
- FIG. 7B is a diagram showing the distribution of the likelihood of the lower two bits of the received signal in one embodiment of the present invention (antenna element 101-1)
- FIG. 7C is a diagram showing the distribution of the likelihood of the lower two bits of the received signal in one embodiment of the present invention (antenna element 101-2)
- FIG. 8 is a diagram showing a simulation result of selecting an antenna element according to one embodiment of the present invention (when one antenna element is selected)
- FIG. 9 is a diagram showing a simulation result of selecting an antenna element according to one embodiment of the present invention (when three antenna elements are selected)
- FIG. 4 is a block diagram showing a configuration of the wireless communication device 100 according to one embodiment of the present invention.
- the radio communication device 100 may be mounted on any of a base station device and a communication terminal device such as a mobile phone, but in the present embodiment, it is assumed that the radio communication device 100 is mounted on the base station device and used. Further, in the present embodiment, it is assumed that wireless communication is performed by a TDD (Time Division Duplex) method.
- TDD Time Division Duplex
- Wireless communication apparatus 100 includes a plurality of antenna elements 101-1 to: L01-n, a plurality of reception radio frequency (RF) units 102-1 to 102-n, and a plurality of data channel (ch) demodulation units 103-.
- RF radio frequency
- a plurality of bit likelihood calculation sections 104-1 to 104-11 a control channel demodulation section 105, a modulation scheme detection section 106, a lower bit likelihood extraction section 107, and a plurality of variance calculation sections 108-1 ⁇ 108-n, comparison section 109, selection section 111, error correction decoding section 112, decoding section 113, transmission antenna selection section 114, coding section 115, data channel modulation section 116, control channel modulation section 117, transmission RF It comprises a part 118 and a switch 119.
- a plurality of antenna elements 101-1 to LO- ⁇ capture modulated radio signals and input them to reception RF sections 102-1 to 102-n, respectively, and receive transmission signals from switch 119. When power is input, the transmission signal is transmitted by radio.
- Each of the plurality of reception radio frequency (RF) sections 102-1 to 102-n includes a non-pass filter, an analog Z-digital converter, a low noise amplifier, and the like, and has antenna elements 101-1 to L01-n. After performing predetermined reception radio processing on the reception signal input from, the reception signal is input to the data channel demodulation units 103-1 to 103-n and the control channel demodulation unit 105, respectively.
- Each of the plurality of data channel (ch) demodulation sections 103-1 to 103-n includes a reception RF section 102
- Each of the plurality of bit likelihood calculation sections 104-1 to 104-n performs a soft decision on a reception signal input from data ch demodulation sections 103-1 to 103-n for each symbol. Then, for all bits included in each symbol, the likelihood for each antenna 101-1 to 101-n is calculated. The likelihood is calculated, and the calculated likelihood for each bit (hereinafter, referred to as “bit likelihood”) and the received signal are input to lower bit likelihood extracting section 107 and selecting section 111 for each symbol.
- Control channel demodulation section 105 demodulates the received signal input from received RF sections 102-1 to 102-n using a demodulation scheme corresponding to the modulation scheme of the control channel in the received signal.
- the demodulated control channel reception signal is input to modulation scheme detection section 106.
- Modulation scheme detection section 106 decodes the control channel reception signal input from control ch demodulation section 105, detects the modulation scheme of the data ch in the reception signal, and indicates the detected modulation scheme to the lower bit.
- the likelihood extracting unit 107 is notified.
- Lower bit likelihood extracting section 107 is input from bit likelihood calculating sections 104-1 to 104-n based on the modulation scheme of data ch notified from modulation scheme detecting section 106. From the bit likelihood for each symbol, determine whether to extract only the bit likelihood of the least significant bit (LSB: Least Significant Bit) or the bit likelihood of the second bit from the LSB. Then, according to the determination result, lower bit likelihood extracting section 107 selects, from among the bit likelihoods for each symbol input from bit likelihood calculating sections 104-1 to 104-n, the bit likelihood of only the LSB. Alternatively, two bit likelihoods of two bits are extracted from the LSB and input to the variance calculation units 108-1 to 108-n.
- LSB least significant bit
- Each of the plurality of variance calculation units 108-1 to 108-n accumulates the bit likelihoods input from the lower bit likelihood extracting unit 107 for a predetermined period, thereby forming antennas 101-1 to L01-n.
- the variance of the bit likelihood is calculated every time. Then, the variance calculation units 108-1 to 108-n each input the calculated variance of the bit likelihood to the comparison unit 109.
- the comparing section 109 compares the variances of the bit likelihoods input from the variance calculating sections 108-1 to 108-n with each other, and the antenna elements 101-1 to: LOl-with smaller variance in order. An order is assigned to n, and the order is notified to the selection unit 111 and the transmission antenna selection unit 114, respectively.
- Selection section 111 determines the reception signals input from bit likelihood calculation sections 104-l to 104-n according to the order of antenna elements 101-1 to L01-n notified from comparison section 109. A predetermined number is selected, and the selected received signal is input to error correction decoding section 112. In other words, the selecting unit 111 determines that the smaller the variance of the bit likelihood is the predetermined number in order. Select the receiving antenna element for the target.
- Error correction decoding section 112 makes a hard decision on the received signal input from selection section 111, performs error correction decoding on the received signal after the hard decision by a predetermined method, and then inputs the signal to decoding section 113.
- Decoding section 113 decodes a received signal input from error correction decoding section 112 by a predetermined method to generate received data, and does not show the generated received data in the drawing! I do.
- the transmitting antenna selecting unit 114 transmits the antenna elements 101-1 to LO notified from the comparing unit 109: LO
- a preset number of antenna elements are selected as transmitting antenna elements, and the selection result is notified to switch 119.
- Encoding unit 115 generates a transmission signal by encoding transmission data, which is also input with a baseband unit (not shown), according to a predetermined method, and converts the generated transmission signal into data ch modulation unit 11.
- Data channel modulating section 116 modulates the transmission signal input from coding section 115 by a predetermined method, and inputs the modulated transmission signal to control channel modulating section 117.
- Control channel modulation section 117 modulates a signal indicating the modulation scheme of the transmission signal input from data channel modulation section 116 by a predetermined scheme, and converts a signal indicating the modulation scheme after modulation to a control channel. The signal is added to the transmission signal input from data channel modulation section 116 as a signal. Then, data ch modulation section 116 inputs the transmission signal to which the control ch signal is added to transmission RF section 118.
- the transmission RF section 118 includes a band-pass filter, digital / analog conversion, a low-noise amplifier, and the like, and performs predetermined transmission radio processing on the transmission signal input from the control channel modulation section 117. After that, the transmission signal is input to the switch 119.
- the switch 119 inputs the transmission signal input from the transmission RF unit 118 to the antenna element selected by the transmission antenna selection unit 114 according to the notification from the transmission antenna selection unit 114.
- FIG. 5 shows an example of a frame configuration of a radio signal used in the present embodiment.
- “” indicates an uplink slot
- “ ⁇ ” indicates a downlink slot.
- radio communication apparatus 100 calculates the variance of the bit likelihood of the received signal in the first uplink slot and selects an antenna element with good reception quality in the first uplink slot, as shown in FIG. In, the transmission signal is continuously transmitted using the selected antenna element. Therefore, according to wireless communication apparatus 100, adaptive transmission diversity can be realized.
- the lower bit likelihood extracting section 107 outputs the L likelihood of the L component of the I component and the L likelihood of the L component of the Q component of the received signal modulated by the quadrature phase amplitude modulation method, By extracting the bit likelihood of a bit (hereinafter, sometimes referred to as “lower 2 bits”), the distribution of the likelihood of the received signal can be represented by two peaks as shown in FIGS. 2A to 2C. Can be prevented from being formed. Also, for a received signal modulated by a phase modulation method with 8 or more values such as 8PSK, the lower bit likelihood extracting section 107 extracts only the LSB bit likelihood, thereby reducing the likelihood variance of the received signal. It can be prevented from spreading
- FIG. 7A to 7C show distribution modes of likelihoods of lower two bits of a received signal modulated by 16QAM.
- FIG. 7A shows the distribution of the likelihood of the lower 2 bits of the received signal in an ideal reception state in which no noise, interference wave, and delay wave are included.
- FIG. 7A shows the likelihood for the lower 2 bits of the received signal in an ideal reception state in which no noise, interference wave, and delay wave are included.
- FIG. 7A shows the distribution of the likelihood of the lower 2 bits of the received signal in an ideal reception state in which no noise, interference wave, and delay wave are included.
- FIG. 7A shows the distribution of the likelihood of the lower 2 bits of the received signal in an ideal reception state in which no noise, interference wave, and delay wave are included.
- FIG. 7A shows the likelihood for the lower two bits in FIG. 7A, in such an ideal reception state, no dispersion occurs in the likelihood of the lower 2 bits of the received signal.
- Figures 7B and C the likelihood for the lower two bits is shown in Figures 7B and
- variance calculation sections 108-1 to 108-n when a radio signal is received by antenna elements 101-1 to L 01-n, variance calculation sections 108-1 to 108-n also control the LSB power in the received signal. Since each likelihood of 2 bits or less is calculated, the likelihood variance can be prevented from being spread, and as a result, the reception quality of each of the antenna elements 101-l to 101-n can be accurately grasped. . As a result, the error rate of the received signal can be improved.
- radio communication apparatus 100 adaptively performs transmission diversity in a transmission slot to transmit a radio signal from an antenna element selected in the immediately preceding reception slot. be able to.
- the radio communication apparatus 100 may be modified or applied as follows.
- lower bit likelihood extracting section 107 calculates the variance of the likelihood of the lower 2 bits of a received signal modulated by the quadrature amplitude modulation method.
- the present invention is not limited to this case. You may make it calculate. Even in this case, the spread of the likelihood of the received signal can be prevented from being spread.
- radio communication apparatus 100 is mounted on a base station apparatus
- the present invention is not limited to this case. It may be mounted on a communication terminal device such as a mobile phone.
- the wireless communication device 100 is mounted on both the base station device and the communication terminal device, and a wireless communication system configured to include these devices is configured to perform wireless communication by the TDD method. Is also good.
- the wireless communication device 100 uses OFDM (Orthogonal Frequency Division Multiplexing).
- Wireless communication may be used.
- the present invention may be used for subcarrier selection in DM. Also, the present invention may be used for stream selection in MIMO.
- Each functional block used in the description of the present embodiment is typically realized as an LSI that is an integrated circuit. These may be individually formed into one chip, or one chip may be included to include a part or all of them.
- ICs, system LSIs, super LSIs, and Penoletra LSIs are sometimes called depending on the degree of integration of LSIs.
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
- Programmable FPGA Field
- a programmable gate array or a reconfigurable processor that can reconfigure the connections and settings of the circuit cells inside the LSI may be used for the IJ.
- the present invention when performing antenna selection diversity, it is possible to prevent the variance of the likelihood of a received signal from spreading, and as a result, it is possible to more accurately grasp the reception quality of each antenna element. Further, it has an effect that the error rate of a received signal can be further improved, and is particularly useful for a base station device performing high-speed wireless communication, a wireless terminal device such as a mobile phone, and the like.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Probability & Statistics with Applications (AREA)
- Theoretical Computer Science (AREA)
- Radio Transmission System (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006512960A JPWO2005109811A1 (ja) | 2004-05-11 | 2005-04-26 | 無線通信装置及び無線通信システム |
EP05737123A EP1746792A1 (en) | 2004-05-11 | 2005-04-26 | Radio communication apparatus and radio communication system |
BRPI0510800-4A BRPI0510800A (pt) | 2004-05-11 | 2005-04-26 | aparelho de comunicação de rádio e sistema de comunicação de rádio |
US11/579,956 US20070223616A1 (en) | 2004-05-11 | 2005-04-26 | Radio Communication Apparatus and Radio Communication System |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-140969 | 2004-05-11 | ||
JP2004140969 | 2004-05-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005109811A1 true WO2005109811A1 (ja) | 2005-11-17 |
Family
ID=35320576
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/007902 WO2005109811A1 (ja) | 2004-05-11 | 2005-04-26 | 無線通信装置及び無線通信システム |
Country Status (7)
Country | Link |
---|---|
US (1) | US20070223616A1 (ja) |
EP (1) | EP1746792A1 (ja) |
JP (1) | JPWO2005109811A1 (ja) |
KR (1) | KR20070009665A (ja) |
CN (1) | CN1947396A (ja) |
BR (1) | BRPI0510800A (ja) |
WO (1) | WO2005109811A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006025371A (ja) * | 2004-07-09 | 2006-01-26 | Sanyo Electric Co Ltd | ダイバーシチ方法およびそれを利用した受信装置 |
JP2008523760A (ja) * | 2004-12-14 | 2008-07-03 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | プログラム可能信号処理回路及び復調方法 |
WO2014091879A1 (ja) | 2012-12-14 | 2014-06-19 | 三菱電機株式会社 | Qam変調通信システムの多値差動復号装置および方法 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100691303B1 (ko) * | 2005-05-25 | 2007-03-12 | 한국전자통신연구원 | 위성통신시스템에서 오차에 강인한 bpsk/qpsk블라인드 변조 분류 장치 및 그 방법 |
US20100022192A1 (en) * | 2008-07-24 | 2010-01-28 | Infineon Technologies Ag | Systems and Methods for Transmitter/Receiver Diversity |
KR102133415B1 (ko) * | 2018-12-31 | 2020-07-14 | 강릉원주대학교산학협력단 | 직교진폭변조의 복조 장치 및 방법 |
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JPH06338835A (ja) * | 1993-05-26 | 1994-12-06 | Sanyo Electric Co Ltd | 無線電話システムの基地局装置 |
JPH10136046A (ja) * | 1996-10-31 | 1998-05-22 | Jisedai Digital Television Hoso Syst Kenkyusho:Kk | 軟判定方式及び受信装置 |
JP2001244860A (ja) * | 2000-03-01 | 2001-09-07 | Hitachi Kokusai Electric Inc | 受信機 |
JP2004023392A (ja) * | 2002-06-14 | 2004-01-22 | Toshiba Corp | ビタビ復号装置、通信システム及びビタビ復号方法 |
JP2004032125A (ja) * | 2002-06-24 | 2004-01-29 | Hitachi Ltd | 通信システムおよび信号処理方法 |
JP2004260712A (ja) * | 2003-02-27 | 2004-09-16 | Mitsubishi Electric Corp | 受信装置 |
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US6298092B1 (en) * | 1999-12-15 | 2001-10-02 | Iospan Wireless, Inc. | Methods of controlling communication parameters of wireless systems |
-
2005
- 2005-04-26 US US11/579,956 patent/US20070223616A1/en not_active Abandoned
- 2005-04-26 BR BRPI0510800-4A patent/BRPI0510800A/pt not_active IP Right Cessation
- 2005-04-26 CN CNA2005800125947A patent/CN1947396A/zh active Pending
- 2005-04-26 EP EP05737123A patent/EP1746792A1/en not_active Withdrawn
- 2005-04-26 KR KR1020067023088A patent/KR20070009665A/ko not_active Application Discontinuation
- 2005-04-26 JP JP2006512960A patent/JPWO2005109811A1/ja active Pending
- 2005-04-26 WO PCT/JP2005/007902 patent/WO2005109811A1/ja not_active Application Discontinuation
Patent Citations (6)
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JPH06338835A (ja) * | 1993-05-26 | 1994-12-06 | Sanyo Electric Co Ltd | 無線電話システムの基地局装置 |
JPH10136046A (ja) * | 1996-10-31 | 1998-05-22 | Jisedai Digital Television Hoso Syst Kenkyusho:Kk | 軟判定方式及び受信装置 |
JP2001244860A (ja) * | 2000-03-01 | 2001-09-07 | Hitachi Kokusai Electric Inc | 受信機 |
JP2004023392A (ja) * | 2002-06-14 | 2004-01-22 | Toshiba Corp | ビタビ復号装置、通信システム及びビタビ復号方法 |
JP2004032125A (ja) * | 2002-06-24 | 2004-01-29 | Hitachi Ltd | 通信システムおよび信号処理方法 |
JP2004260712A (ja) * | 2003-02-27 | 2004-09-16 | Mitsubishi Electric Corp | 受信装置 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006025371A (ja) * | 2004-07-09 | 2006-01-26 | Sanyo Electric Co Ltd | ダイバーシチ方法およびそれを利用した受信装置 |
JP4610248B2 (ja) * | 2004-07-09 | 2011-01-12 | 京セラ株式会社 | ダイバーシチ方法およびそれを利用した受信装置 |
JP2008523760A (ja) * | 2004-12-14 | 2008-07-03 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | プログラム可能信号処理回路及び復調方法 |
WO2014091879A1 (ja) | 2012-12-14 | 2014-06-19 | 三菱電機株式会社 | Qam変調通信システムの多値差動復号装置および方法 |
US9143273B2 (en) | 2012-12-14 | 2015-09-22 | Mitsubishi Electric Corporation | Multi-level differential decoding device and method for quadrature amplitude modulation communication system |
Also Published As
Publication number | Publication date |
---|---|
US20070223616A1 (en) | 2007-09-27 |
JPWO2005109811A1 (ja) | 2008-03-21 |
CN1947396A (zh) | 2007-04-11 |
BRPI0510800A (pt) | 2007-11-06 |
KR20070009665A (ko) | 2007-01-18 |
EP1746792A1 (en) | 2007-01-24 |
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