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    • 54. 发明授权
    • Radio communication system, radio communication device, and channel correlation matrix decision method
    • 无线电通信系统,无线电通信设备和信道相关矩阵决策方法
    • US08081702B2
    • 2011-12-20
    • US12280677
    • 2007-02-28
    • Masayuki HoshinoKenichi MiyoshiYasuaki YudaKatsuhiko HiramatsuRyohei Kimura
    • Masayuki HoshinoKenichi MiyoshiYasuaki YudaKatsuhiko HiramatsuRyohei Kimura
    • H04B7/02
    • H04B7/0626H04B7/0417H04B7/0434H04B7/063H04B7/0689
    • It is possible to prevent lowering of a throughput of a radio communication system even when propagation path environments of an uplink line and downlink line are asymmetric. A maximum proper value calculation unit (115) calculates a maximum proper value from a channel matrix. A maximum proper value comparison unit (116) compares the maximum proper value with a maximum proper value of the downlink line reported separately from a base station. According to the comparison result obtained by the maximum proper value comparison unit (116), a proper mode initiative instruction unit (117) decides to pass the proper mode initiative to a communication partner or to the local device. When the initiative is to be passed to the local device, this fact is reported to a proper bam correction unit (118). When the proper beam correction unit (118) gets the proper mode initiative, the proper beam correction unit (118) corrects the correlation matrix by using the proper values of both of the downlink line and the uplink line and instructs a directivity forming unit (103) to form a proper beam according to the correlation matrix after the correction.
    • 即使上行链路和下行链路的传播路径环境不对称,也可以防止无线通信系统的吞吐量的降低。 最大适当值计算单元(115)从信道矩阵计算最大适当值。 最大适当值比较单元(116)将最大适当值与从基站分开报告的下行线路的最大适当值进行比较。 根据由最大适当值比较单元(116)获得的比较结果,正确的模式主动指示单元(117)决定将适当的模式主动通过通信对方或本地设备。 当该举措传递给本地设备时,这一事实报告给适当的巴姆纠正单位(118)。 当正确的光束校正单元(118)获得适当的模式主动时,适当的光束校正单元(118)通过使用下行链路线路和上行线路两者的适当值来校正相关矩阵,并且指示方向性形成单元(103 )根据校正后的相关矩阵形成适当的波束。
    • 55. 发明申请
    • WIRELESS RECEIVER AND FEEDBACK METHOD
    • 无线接收机和反馈方法
    • US20110096877A1
    • 2011-04-28
    • US12920030
    • 2009-03-05
    • Ryohei KimuraKenichi MiyoshiKatsuhiko Hiramatsu
    • Ryohei KimuraKenichi MiyoshiKatsuhiko Hiramatsu
    • H04L1/02
    • H04L1/003H04L1/0026H04L1/0029H04L1/06H04L25/0204H04L25/0224H04L25/0248H04W72/0413H04W72/085
    • Disclosed is a wireless receiver and feedback method for reducing the amount of CQI feedback in a MIMO channel. A channel estimation unit (103) uses a received pilot signal to estimate the channel matrix for each RB between respective transceiver antennas, and then performs eigenvalue decomposition of the estimated channel matrix to find eigenvalues and eigenvectors. A feedback data generator (104) is provided with a feedback bit table that correlates the number of quantized bits for the averaged CQI to be transmitted for each eigenvalue and the number of quantized bits for the CQI in each RB, and then reduces the number of quantized bits for the averaged CQI Xk commensurate with the magnitude of the eigenvalue number k. The feedback data generator (104) averages eigenvalues found by the channel estimator (103) for each RB, converts the averaged eigenvalue to a CQI for each eigenvalue number, and generates feedback data from the CQI for each eigenvalue with the number of quantized bits according to the feedback table.
    • 公开了一种用于减少MIMO信道中的CQI反馈量的无线接收机和反馈方法。 信道估计单元(103)使用接收到的导频信号来估计各个收发天线之间的每个RB的信道矩阵,然后执行所估计的信道矩阵的特征值分解以找到特征值和特征向量。 反馈数据生成器(104)具有将每个特征值要发送的平均CQI的量化比特数与每个RB中的CQI的量化比特数相关联的反馈比特表,然后减少 用于与特征值k的大小相称的平均CQI Xk的量化比特。 反馈数据生成器(104)对于每个RB对由信道估计器(103)找到的特征值进行平均,将每个特征值数的平均特征值转换为CQI,并且针对每个具有量化比特数的特征值的CQI生成反馈数据, 到反馈表。
    • 59. 发明授权
    • Radio infrastructure apparatus
    • 无线电基础设施
    • US07266096B2
    • 2007-09-04
    • US10169902
    • 2001-11-27
    • Kazuyuki MiyaKatsuhiko HiramatsuKenichi Miyoshi
    • Kazuyuki MiyaKatsuhiko HiramatsuKenichi Miyoshi
    • H04B7/212H04B7/216H04B7/00H04Q7/20
    • H04W52/12H04W36/18H04W52/16H04W52/24H04W52/40
    • Error detection section 109 carries out error detection using demodulated data and outputs an error rate to SIR versus error rate estimation section 110. SIR versus error rate estimation section 110 estimates an SIR versus error rate and outputs the result of decision as to whether the correction of the target SIR value is necessary or not to target SIR correction section 111. Target SIR correction section 111 corrects the target SIR value based on the decision result. The information on the demodulation capability of a BTS is output to G parameter control section 112 and G parameter control section 112 determines an optimal gain factor. A G parameter indicating the determined gain factor is output to multiplexing section 107 of the BTS. The G parameter is output to SIR versus error rate estimation section 110. This makes it possible to perform communications with an optimal gain factor and target SIR during diversity handover between base stations with and without an interference canceller or between base stations with interference cancellers of different capabilities.
    • 错误检测部件109使用解调数据进行错误检测,并向SIR与误差率估计部件110输出错误率。 SIR对误差率估计部110估计SIR与误差率,并且输出关于目标SIR值的校正是否需要的目标SIR校正部111的判定结果。 目标SIR校正部111基于判定结果来校正目标SIR值。 关于BTS的解调能力的信息被输出到G参数控制部分112,并且G参数控制部分112确定最佳增益因子。 指示确定的增益因子的G参数被输出到BTS的多路复用部分107。 G参数输出到SIR与误码率估计部分110。 这使得可以在具有和不具有干扰消除器的基站之间或者具有不同能力的干扰消除器的基站之间的分集切换期间执行具有最佳增益因子和目标SIR的通信。
    • 60. 发明授权
    • Communication terminal apparatus, base station apparatus and communication method
    • 通信终端装置,基站装置和通信方法
    • US06788737B1
    • 2004-09-07
    • US10070459
    • 2002-03-07
    • Kenichi MiyoshiKatsuhiko Hiramatsu
    • Kenichi MiyoshiKatsuhiko Hiramatsu
    • H04L516
    • H04L1/0015H04L1/0003H04L1/0025
    • PL demodulation section 203 demodulates pilot signals of a received signal. SIR detection section 205 detects the reception quality of the demodulated pilot signals. fd detection section 206 detects a Doppler frequency using the demodulated pilot signals. Requested modulation method deciding section 207 decides a modulation method to be requested to the base station using the reception quality of pilot signals and the detected Doppler frequency. Command generation section 208 generates a command corresponding to the decided modulation method. Adaptive demodulation section 204 performs demodulation processing on the received signal using the demodulation method corresponding to the modulation method decided by requested modulation method deciding section 207. This makes it possible to maintain good reception quality even in a fading environment.
    • PL解调单元203对接收信号的导频信号进行解调。 SIR检测部件205检测解调的导频信号的接收质量。 fd检测部206使用解调的导频信号来检测多普勒频率。 请求调制方式决定部207使用导频信号的接收质量和检测到的多普勒频率来决定向基站请求的调制方式。 命令生成部208生成与决定的调制方式对应的命令。 自适应解调部204使用与由请求调制方式决定部207决定的调制方式相对应的解调方式,对接收信号进行解调处理。即使在衰落环境中也能够保持良好的接收质量。