WO2007126008A1 - 無線通信方法、無線通信装置及び無線通信システム - Google Patents
無線通信方法、無線通信装置及び無線通信システム Download PDFInfo
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- WO2007126008A1 WO2007126008A1 PCT/JP2007/059077 JP2007059077W WO2007126008A1 WO 2007126008 A1 WO2007126008 A1 WO 2007126008A1 JP 2007059077 W JP2007059077 W JP 2007059077W WO 2007126008 A1 WO2007126008 A1 WO 2007126008A1
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- Prior art keywords
- wireless communication
- communication device
- base station
- directivity
- signal
- Prior art date
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- 238000004891 communication Methods 0.000 title claims description 175
- 238000000034 method Methods 0.000 title claims description 16
- 230000003044 adaptive effect Effects 0.000 claims abstract description 39
- 238000012544 monitoring process Methods 0.000 claims description 21
- 230000015556 catabolic process Effects 0.000 claims description 12
- 238000006731 degradation reaction Methods 0.000 claims description 12
- 230000000630 rising effect Effects 0.000 claims description 10
- 238000012545 processing Methods 0.000 description 26
- 230000005540 biological transmission Effects 0.000 description 17
- 238000011144 upstream manufacturing Methods 0.000 description 13
- 230000001629 suppression Effects 0.000 description 12
- 238000012549 training Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 10
- 238000012937 correction Methods 0.000 description 5
- 230000003111 delayed effect Effects 0.000 description 4
- 238000005457 optimization Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005562 fading Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/005—Control of transmission; Equalising
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- 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
- H04B7/0613—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 simultaneous transmission
- H04B7/0615—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 simultaneous transmission of weighted versions of same signal
- H04B7/0619—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 simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
-
- 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
- H04B7/204—Multiple access
- H04B7/212—Time-division multiple access [TDMA]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/364—Delay profiles
Definitions
- Wireless communication method Wireless communication apparatus, and wireless communication system
- the present invention relates to a wireless communication method, a wireless communication apparatus, and a wireless communication system that employ TDD (Time Division Duplex).
- TDD Time Division Duplex
- a TDD-T DMA system is known as an air interface used in a radio communication system that forms a service area divided into a plurality of cells (one sector) and includes a plurality of base station apparatuses.
- TDD In a wireless communication system using TDMA (for example, Personal Handyphone System), the effect of fading on the communication path inhibits the increase in communication capacity.
- multipath fading is caused by the presence of several delayed waves.
- the characteristics of the propagation path can be improved by equalizing the delayed wave.
- the same frequency is used in uplink and downlink communication paths. For example, when a mobile station (terminal) equalizes a delayed wave in an uplink communication channel, the downlink communication channel Therefore, the delay spread estimated in the reception can be directly applied to the delay spread of the uplink communication channel.
- Patent Document 1 discloses an asymmetric wireless communication method in which the communication speed in the downlink direction is higher than that in the uplink direction. Specifically, in the asymmetric wireless communication method, orthogonal frequency division multiplexing (OFDM) is used in the downlink direction.
- OFDM orthogonal frequency division multiplexing
- the IDFT input signal used in the modulation unit according to OFDM is given a characteristic that is opposite to the frequency characteristic of the propagation path estimated from the uplink signal (uplink communication channel).
- the frequency characteristic of the propagation path is estimated by performing Fourier transform on the demodulated signal. It is disclosed.
- a technique for controlling antenna directivity using a technique such as an adaptive array antenna is introduced on the base station side.
- the base station optimally sets the antenna directivity according to the characteristics of the uplink propagation path, and uses the set directivity. To transmit a downstream signal.
- the base station uses the known signal pattern (preamble, uplink pilot) included in the uplink TDD frame that is repeatedly transmitted at a predetermined cycle, to direct the directivity of the adaptive array antenna. To optimize.
- the base station transmits and receives user data using optimized directivity patterns (weights).
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-141888
- the propagation path characteristics in the downlink direction and the uplink transmission transmitted thereafter are optimized. Differences may occur in the transport path characteristics. For this reason, there is a problem that a deviation occurs in the equalization parameter for compensating the uplink channel characteristic based on the downlink channel characteristic.
- the directivity of the adaptive array antenna When transmitting an uplink signal by applying a delay spread estimated based on a signal received via a downlink communication channel, the directivity of the adaptive array antenna If the delay spread of the upstream signal is equalized in the section used for optimization (training section), the directivity of the adaptive array antenna cannot be optimized normally. 2) The directivity of the adaptive array antenna When the directivity changes due to the optimization of the directivity, the delay spread changes, and therefore there is a problem that the effect of compensating the uplink channel characteristics cannot be obtained.
- the mobile station when the mobile station is located inside a building or the like, for example, when communicating with a base station installed outdoors, the mobile station does not move. Although the speed is low, there is a relatively large level of delayed waves, and a decrease in communication speed, particularly in the uplink communication channel, has been a problem.
- An object of the present invention is to provide a wireless communication method, a wireless communication apparatus, and a wireless communication system that can prevent a decrease in communication speed by preventing a shift in equalization parameters that compensates for propagation path characteristics.
- a first feature of the present invention is that wireless communication is performed between a first wireless communication device including an adaptive array antenna and the first wireless communication device.
- a wireless communication method executed with a second wireless communication device wherein the first wireless communication device is used to control the directivity of a beam transmitted to the second wireless communication device.
- the first wireless communication apparatus indicates that the value indicating the change is lower than the predetermined value.
- a second feature of the present invention relates to the first feature of the present invention, and is included in a signal transmitted to the first radio communication device in the equalizing step, and the first radio The gist is to stop equalization of the signal used by the communication device to control the directivity of the adaptive array antenna.
- a third feature of the present invention relates to the first or second feature of the present invention and relates to the monitoring step.
- the first wireless communication apparatus transmits ascending information indicating that the value indicating the change exceeds the predetermined value to the second wireless communication device.
- the present invention includes a step of transmitting to a communication device and a step of controlling equalization of a signal to be transmitted to the first wireless communication device based on the rising information, the second wireless communication device. To do.
- a fourth feature of the present invention is a wireless communication apparatus equipped with an adaptive array antenna, which is a parameter of the adaptive array antenna used for controlling the directivity of a beam to be transmitted.
- a monitoring unit that monitors changes, and when the monitoring unit detects that the value indicating the change is lower than a predetermined value, the directivity control is suppressed, and the value indicating the change is And a directivity control unit that transmits degradation information indicating that the value is lower than the value.
- a fifth feature of the present invention is a wireless communication apparatus that performs wireless communication with a base station including an adaptive array antenna, and is used to control the directivity of a beam to be transmitted.
- a determination unit that determines a delay state of a received signal received from the base station when degradation information indicating that a value indicating a change in a parameter of the active array antenna is lower than a predetermined value is received from the base station;
- an equalization control unit that equalizes the signal to be transmitted to the base station based on the delay state of the received signal determined by the determination unit and transmits the equalized signal to the base station. Is the gist.
- a sixth feature of the present invention relates to the fifth feature of the present invention, wherein the equalization control unit equalizes a signal used by the base station to control the directivity of an adaptive array antenna.
- the gist is to transmit to the base station without doing.
- a seventh feature of the present invention relates to the fifth or sixth feature of the present invention, wherein the equalization control unit receives ascent information indicating that the value indicating the change exceeds the predetermined value.
- the gist is to control equalization of a signal transmitted to the base station based on the rising information when received from the base station.
- An eighth feature of the present invention is that: a first wireless communication device including an adaptive array antenna; a second wireless communication device that performs wireless communication with the first wireless communication device;
- the first wireless communication device is the second wireless communication device
- the directivity control unit that suppresses the directivity control and transmits degradation information indicating that the value indicating the change is below the predetermined value to the second wireless communication device.
- the second wireless communication device receives the degradation information from the first wireless communication device, the second wireless communication device determines a delay state of the received signal received from the first wireless communication device. Based on a delay state of the received signal determined by the determination unit and the determination unit, a signal to be transmitted to the first wireless communication device is equalized and the equalized signal is transmitted to the first wireless communication device. Equalization control to send And summarized in that a and.
- a ninth feature of the present invention relates to the eighth feature of the present invention, wherein the equalization control unit is a signal used by the first wireless communication apparatus to control the directivity of an adaptive array antenna. The gist is to transmit to the base station without equalization.
- a tenth feature of the present invention relates to the eighth or ninth feature of the present invention, wherein the directivity control unit is configured to provide a value indicating the change when the value indicating the change exceeds the predetermined value. Is transmitted to the second wireless communication apparatus, and the equalization control unit transmits to the first wireless communication apparatus based on the increased information. It is important to control signal equalization.
- FIG. 1 is a schematic configuration diagram of a radio communication system according to an embodiment of the present invention.
- FIG. 2 is a block diagram of a transmission slot.
- FIG. 3 is a block diagram of a first wireless communication apparatus (base station) according to the present embodiment.
- FIG. 4 is a block diagram of a second wireless communication apparatus (mobile terminal apparatus) according to the present embodiment.
- FIG. 5 is an explanatory diagram for explaining the content of processing for applying OFDM to the downlink slot and compensating for the uplink channel characteristics.
- FIG. 6 is an explanatory diagram of directivity suppression bit information and directivity flag information.
- FIG. 7 is a flowchart showing processing for each frame in the base station according to the present embodiment.
- FIG. 8 is a flowchart showing slot processing for each mobile terminal apparatus according to the present embodiment.
- FIG. 9 is an explanatory diagram of signal transmission / reception operations between the base station and the mobile terminal apparatus according to the present embodiment.
- FIG. 1 is a schematic configuration diagram of a radio communication system according to an embodiment of the present invention.
- a radio communication system 10 includes a base station 20 as a first radio communication device.
- a mobile terminal device (mobile station) 30 as a second wireless communication device such as a mobile phone.
- the direction from the base station 20 to the mobile terminal device 30 is the downlink direction
- the direction from the mobile terminal device 30 to the base station 20 is the uplink direction
- OFDM is used in the downlink direction
- BPSK, QPSK, 8PSK, or QAM is used in the uplink direction.
- the downlink (DL) slot used in the downlink direction and the uplink (UL) slot used in the uplink direction are formed by the preamble 41 and the user data 42 following the preamble 41. Is done.
- the base station 20 includes an adaptive array antenna, and monitors changes in parameters of the adaptive array antenna used to control the directivity of a signal (beam) transmitted to the mobile terminal device 30. To do.
- the base station 20 directs the signal to be transmitted to the mobile terminal device 30 when a value indicating the change in the parameter (amount of change) falls below a predetermined value set in advance. Suppress sex control. Furthermore, the base station 20 transmits, to the mobile terminal device 30, flag information that indicates that the value indicating the change has fallen below a predetermined value. In addition, if the value indicating the change in the parameter exceeds the predetermined value, the base station 20 Is transmitted to the mobile terminal device 30 as flag information.
- FIG. 3 is a block diagram of the base station 20.
- the base station 20 constitutes a first radio communication device.
- Base station 20 includes an adaptive array antenna (hereinafter referred to as AA). As shown in FIG. 3, the base station 20 includes an RF switch 230 including a plurality (K in this embodiment) of antennas 210-1 to 210-K, an adaptive array processing unit 220, an antenna switcher (Duplexer), and the like.
- AA adaptive array antenna
- a receiving unit 240 that performs channel estimation and channel equalization processing on the received signals of each antenna, performs demodulation processing on the signals by the receiving unit 240, and 1) a data demodulation unit 250 that obtains received data, and transmits transmission data according to OFDM
- a data modulation unit 260 that modulates, an inverse Fourier transform unit (IFFT) 270 that performs inverse Fourier transform processing on the modulated data, and a transmission unit 280 that converts the signal subjected to the inverse Fourier transform processing into a transmission format.
- IFFT inverse Fourier transform unit
- the adaptive array processing unit 220 monitors the amount of change in the AA directivity parameter.
- the adaptive array processing unit 220 suppresses the AA control when the change of the AA parameter, specifically, the directivity parameter is equal to or less than a certain amount over several slots, and suppresses the specific flag (AA) of the downlink communication slot. By setting the control suppression flag) to “1”, degradation information indicating that the suppression has occurred is generated.
- the adaptive array processing unit 220 constitutes a monitoring unit and a directivity control unit.
- the adaptive array processing unit 220 determines the AA directivity parameter based on the AA training signal received via the uplink communication channel.
- the adaptive array processing unit 220 does not control the directivity of the downstream signal from the upstream receiving slot used for training when the upstream communication channel, that is, the upstream propagation path characteristic is equalized.
- the directivity is controlled from the downstream transmission slot.
- adaptive array processing section 220 indicates that fact using a downlink communication slot flag.
- the mobile terminal device 30 uses flag information (decrease information) indicating that the value indicating the change in the directivity parameter of the AA used for controlling the directivity of the signal (beam) to be transmitted is lower than a predetermined value. ) Is received from the base station 20.
- the mobile terminal device 30 When the mobile terminal device 30 receives the flag information from the base station 20, the mobile terminal device 30 Then, the delay state of the received signal received is determined. Further, the mobile terminal apparatus 30 equalizes the signal to be transmitted to the base station 20 based on the determined delay state of the received signal, and transmits the equalized signal to the base station 20. Note that the mobile terminal device 30 transmits the AA directivity control training signal used in the base station 20 to the base station 20 without equalization.
- the mobile terminal device 30 When the mobile terminal device 30 receives from the base station 20 flag information (increase information) indicating that the value indicating the change in the directivity parameter of AA exceeds the predetermined value V, the mobile terminal device 30 And controls the equalization processing of the signal transmitted to the base station 20. Specifically, the mobile terminal device 30 has a function of estimating the propagation path characteristics in the downlink direction from the base station 20, and based on the estimation result of the propagation path characteristics, a baseband filter applied to the uplink communication channel. Change the tap coefficient.
- the mobile terminal device 30 includes a delay profile estimation function 31, a delay profile accumulation Z averaging processing function 32, and a base as a baseband filter optimization function.
- a band filter delay profile application processing function 33 is provided.
- FIG. 4 is a block diagram of the mobile terminal device 30.
- the mobile terminal device 30 constitutes a second wireless communication device.
- the mobile terminal device 30 includes a transmission / reception antenna 310, an RF switch 320 including an antenna switch (Duplexer), etc., a receiving unit 330 that performs channel estimation and channel equalization processing on the received signal of each antenna, and the like.
- FFT Fast Fourier Transform
- the correction unit 370 constitutes a determination unit.
- the equalization control unit is configured by the correction unit 370, the baseband filter 380, and the transmission unit 390.
- the mobile terminal apparatus 30 When receiving the flag information from the base station 20, the mobile terminal apparatus 30 starts estimating the delay profile (propagation path) of the downlink communication channel, and the characteristics are equalized using the estimated delay profile.
- a signal is transmitted using a propagation path, specifically, an uplink communication channel.
- Transmitting section 390 transmits a signal used for AA training in the uplink communication channel without equalization.
- the mobile terminal device 30 in the subsequent communication frame The directivity is controlled by applying the directivity parameter of AA for each slot without equalizing the upstream communication channel.
- the mobile terminal device 30 since OFDM is used for the downlink communication channel, Fourier transform is always performed at the time of demodulation. In other words, in the downlink communication channel, the propagation path characteristics are always estimated.
- the mobile terminal device 30 adds a parameter opposite to the estimated propagation path characteristics to the transmission-side baseband filter, and the transmission side characteristics are input to the transmission side. By compensating for the characteristics of the uplink propagation path using an equalizer, the modulation accuracy can be maintained even when an advanced modulation scheme is used.
- Fig. 5 illustrates the content of processing that applies OFDM to the downstream slot and compensates the upstream channel characteristics in a slot configuration similar to the Personal Handyphone System (PHS) (8 slots Z5ms). It is explanatory drawing to do.
- PHS Personal Handyphone System
- the frequency band is set to 384 kHz, and one slot is set to 625 s, as in the PHS.
- One frame is composed of a total of 8 slots, 4 slots in the up and down directions.
- OFDM tones are set every 2 KHz, and among 192 tones (384 kHz Z2KH), 12 tones are used as guard tones or pilot tones.
- 180 tones are set per slot.
- one tone is QPSK modulated or 16QAM modulated
- 360 bits or 720 bits can be transmitted per slot.
- the data rate is 36kbps (720 * 200Z4).
- the mobile terminal apparatus 30 After receiving the downlink slot, the mobile terminal apparatus 30 performs a Fourier transform on the received signal. Thus, each OFDM tone is demodulated, and the frequency characteristics of the propagation path are estimated based on the level of each OFDM tone. After estimating the frequency characteristics, the mobile terminal apparatus 30 estimates the delay profile of the propagation path by performing inverse Fourier transform of the frequency characteristics. Further, the mobile terminal apparatus 30 compensates the characteristics of the uplink propagation path by convolving the inverse characteristics of the delay profile with the baseband filter 380.
- the frequency band to be used is the same in the upstream and downstream directions, and when the slot spacing in the upstream and downstream directions is small, the channel characteristics in the upstream and downstream directions are almost the same. Based on the assumption that there is, the control described above is possible.
- mobile terminal apparatus 30 transmits directivity suppression bit information BT30 to base station 20.
- the directivity suppression bit information BT30 When the directivity suppression bit information BT30 is set to "1”, it means “directivity fixation request (equalization execution)", which is a request to fix directivity due to channel equalization processing. To do. On the other hand, if directional suppression bit information BT30 is set to ⁇ 0 '', channel equalization is not performed and the directivity is not fixed! ⁇ ⁇ Directivity fixed request not required (equalization not performed) '' means.
- Base station 20 transmits directivity flag information FLG20 to mobile terminal apparatus 30.
- FIG. 7 is a flowchart showing processing for each frame in the base station 20 in step ST201! /! First, the base station 20 receives the training signal and calculates the directivity parameter of AA.
- step ST202 the base station 20 determines whether or not the change amount of the directivity parameter of AA is equal to or less than p over the past y slots.
- step ST203 base station 20 sets the AA control suppression flag. Set to “1” to suppress AA control.
- step ST204 the base station 20 uses the T-1 slot (the slot used in the immediately preceding transmission slot).
- base station 20 receives a user data slot. Step ST2
- the base station 20 sets the AA directivity parameter of the T slot.
- Step ST207 [Koo! / Take a base station 20 ⁇ or send a preamplifier.
- Step ST208 [KOO! /] Then, the base station 20 sets the ⁇ control suppression flag to “0” and transmits it.
- Step ST209 the base station 20 transmits a user data slot.
- the base station 20 determines that the amount of change in the directivity parameter of ⁇ is not less than or equal to ⁇ over the past y slots (the amount of change exceeds the predetermined value p), in ST210, the base station 20 Set to “0” to not suppress AA control.
- base station 20 sets the directivity parameter of AA in the T slot.
- base station 20 receives the user data slot.
- base station 20 transmits a preamble.
- the base station 20 transmits the AA control suppression flag set to “0”.
- the base station 20 transmits a user data slot.
- FIG. 8 is a flowchart showing slot processing for each mobile terminal device 30.
- ST3 the slot processing for each mobile terminal device 30.
- the mobile terminal device 30 receives the downlink communication slot.
- Step ST302 the mobile terminal apparatus 30 determines whether or not the AA control suppression flag is set to "1"!
- T303 the delay profile of the downlink communication channel is estimated.
- mobile terminal apparatus 30 transmits a training signal without correcting the tap coefficient of baseband filter 380.
- mobile terminal apparatus 30 corrects the tap coefficient of baseband filter 380 based on the delay profile.
- user data is transmitted with the tap coefficient of baseband filter 380.
- step ST307 mobile terminal apparatus 30 does not correct the tap coefficient of baseband filter 380. Send a ringing signal.
- DL indicates the downlink and UL indicates the uplink.
- BS is the base station, M
- S indicates a mobile terminal device (mobile station).
- the base station monitors the amount of change in the directivity parameter of AA for a certain period (ST401).
- the base station suppresses AA control, and indicates that the AA control is suppressed by a downlink communication slot flag (ST).
- the mobile terminal apparatus detects the flag set in step ST402, it starts estimating the delay profile of the downlink communication channel (ST403).
- the mobile terminal apparatus equalizes the propagation path characteristics using the estimated delay profile, and transmits a signal via the uplink communication channel (ST404).
- the mobile terminal apparatus transmits, without equalization, a training signal used for AA training in the uplink communication channel.
- the base station receives the AA training signal of the uplink communication channel and determines the AA directivity meter.
- the mobile terminal apparatus does not apply the AA directivity control from the reception slot used for training, but the AA directivity from the next downlink transmission slot is not applied. Control is applied (ST405).
- the base station When the estimated AA directivity parameter changes significantly, the base station indicates this using a downlink communication slot flag (ST406). After that, the base station does not equalize the upstream communication channel in units of frames, and controls the directivity by applying the directivity parameter of AA for each slot (ST407).
- the base station 20 uses the adaptive array antenna parameter (used to control the directivity of the signal (beam) transmitted to the mobile terminal apparatus 30 ( If the monitoring unit that monitors changes in the AA directivity parameter) and the value (change amount) indicating the change in the parameter falls below a preset value, the directivity control is suppressed and Degradation information indicating A directivity control unit that transmits to the mobile terminal device 30 as flag information when the value indicating the change exceeds the predetermined value is transmitted to the device 30.
- the adaptive array antenna parameter used to control the directivity of the signal (beam) transmitted to the mobile terminal apparatus 30 ( If the monitoring unit that monitors changes in the AA directivity parameter) and the value (change amount) indicating the change in the parameter falls below a preset value, the directivity control is suppressed and Degradation information indicating A directivity control unit that transmits to the mobile terminal device 30 as flag information when the value indicating the change exceeds the predetermined value is transmitted to the device 30.
- the mobile terminal device 30 determines the delay state of the received signal, and the delay state of the received signal determined by the determination unit And an equalization control unit for equalizing the signal to be transmitted to the base station 20 and transmitting the equalized signal to the base station 20.
- the wireless communication method, the wireless communication apparatus, and the wireless communication system according to the present invention it is possible to reduce the communication speed by preventing the deviation of the equalization parameter that compensates the propagation path characteristic. This is useful for wireless communications such as mobile communications.
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Priority Applications (5)
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KR1020087028084A KR101030845B1 (ko) | 2006-04-27 | 2007-04-26 | 무선 통신 방법, 무선 통신 장치 및 무선 통신 시스템 |
CN200780015132XA CN101432988B (zh) | 2006-04-27 | 2007-04-26 | 无线通信方法、无线通信装置及无线通信系统 |
US12/298,340 US8249514B2 (en) | 2006-04-27 | 2007-04-26 | Radio communication method, device and system for equalizing a signal |
JP2008513264A JP4422778B2 (ja) | 2006-04-27 | 2007-04-26 | 無線通信方法、無線通信装置及び無線通信システム |
EP07742512A EP2023506A1 (en) | 2006-04-27 | 2007-04-26 | Radio communication method, radio communication device, and radio communication system |
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JP2006124507 | 2006-04-27 | ||
JP2006-124507 | 2006-04-27 |
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EP (1) | EP2023506A1 (ja) |
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KR (1) | KR101030845B1 (ja) |
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US8270514B2 (en) * | 2005-01-17 | 2012-09-18 | Sharp Kabushiki Kaisha | Communication device |
CN102739602B (zh) | 2007-08-14 | 2016-03-16 | 株式会社Ntt都科摩 | 接收装置和数据取得方法 |
EP2112775B1 (en) * | 2008-04-25 | 2018-06-06 | Telefonaktiebolaget LM Ericsson (publ) | Method and apparatus for compensation for propagation delay in a wireless communication system |
CN102223648B (zh) * | 2010-04-13 | 2017-02-08 | 中兴通讯股份有限公司 | 获取基站天线端口配置参数的方法及装置 |
WO2017006528A1 (ja) * | 2015-07-07 | 2017-01-12 | パナソニックIpマネジメント株式会社 | 通信システム、送信端末および受信端末 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001102970A (ja) * | 1999-09-29 | 2001-04-13 | Matsushita Electric Ind Co Ltd | 通信端末装置及び無線通信方法 |
JP2002141888A (ja) | 2000-11-02 | 2002-05-17 | Matsushita Electric Ind Co Ltd | 非対称無線通信方法 |
JP3375139B2 (ja) * | 1997-06-03 | 2003-02-10 | 株式会社エヌ・ティ・ティ・ドコモ | アダプティブアレイ送受信機 |
JP2006124507A (ja) | 2004-10-28 | 2006-05-18 | Jfe Steel Kk | コークス炉用放散弁 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6895253B1 (en) * | 1995-03-14 | 2005-05-17 | Lucent Technologies Inc. | Wireless indoor communications using antenna arrays |
JP3872953B2 (ja) * | 1999-12-27 | 2007-01-24 | 株式会社東芝 | アダプティブアンテナを用いた無線通信装置 |
US7054292B2 (en) * | 2000-10-27 | 2006-05-30 | L-3 Communications Corporation | Hybrid synchronous space/code multiple access system using an adaptive antenna system |
JP4309110B2 (ja) * | 2002-09-27 | 2009-08-05 | パナソニック株式会社 | 適応アンテナ無線通信装置 |
JP4247019B2 (ja) * | 2003-03-24 | 2009-04-02 | 京セラ株式会社 | 無線通信機 |
-
2007
- 2007-04-26 US US12/298,340 patent/US8249514B2/en not_active Expired - Fee Related
- 2007-04-26 KR KR1020087028084A patent/KR101030845B1/ko not_active IP Right Cessation
- 2007-04-26 JP JP2008513264A patent/JP4422778B2/ja not_active Expired - Fee Related
- 2007-04-26 EP EP07742512A patent/EP2023506A1/en not_active Withdrawn
- 2007-04-26 WO PCT/JP2007/059077 patent/WO2007126008A1/ja active Application Filing
- 2007-04-26 CN CN200780015132XA patent/CN101432988B/zh not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3375139B2 (ja) * | 1997-06-03 | 2003-02-10 | 株式会社エヌ・ティ・ティ・ドコモ | アダプティブアレイ送受信機 |
JP2001102970A (ja) * | 1999-09-29 | 2001-04-13 | Matsushita Electric Ind Co Ltd | 通信端末装置及び無線通信方法 |
JP2002141888A (ja) | 2000-11-02 | 2002-05-17 | Matsushita Electric Ind Co Ltd | 非対称無線通信方法 |
JP2006124507A (ja) | 2004-10-28 | 2006-05-18 | Jfe Steel Kk | コークス炉用放散弁 |
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JPWO2007126008A1 (ja) | 2009-09-10 |
JP4422778B2 (ja) | 2010-02-24 |
KR20080110911A (ko) | 2008-12-19 |
US8249514B2 (en) | 2012-08-21 |
EP2023506A1 (en) | 2009-02-11 |
CN101432988B (zh) | 2012-08-29 |
CN101432988A (zh) | 2009-05-13 |
US20100233966A1 (en) | 2010-09-16 |
KR101030845B1 (ko) | 2011-04-22 |
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