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    • 41. 发明授权
    • Wireless communication apparatus, wireless communication system and wireless communication method
    • 无线通信装置,无线通信系统及无线通信方式
    • US08588321B2
    • 2013-11-19
    • US12809701
    • 2008-10-23
    • Masayuki HoshinoKatsuhiko HiramatsuKenichi Miyoshi
    • Masayuki HoshinoKatsuhiko HiramatsuKenichi Miyoshi
    • H04K1/10
    • H04B7/0452H04B7/0417H04B7/0426H04B7/0632H04L1/0025H04L1/0026H04L1/0036H04W72/08
    • When power scaling is applied to multi-user MIMO, a reduction in transmission rate is suppressed and transmission efficiency is improved. When signals are transmitted through spatial multiplexing from a wireless base station 11 to a plurality of pieces of user equipment 12 and 13, notification of a transmission parameter (MCS) of the distant user equipment (UE-B) 13 is provided as control information to the adjacent user equipment (UE-A) 12. The user equipment 12 calculates, based on the received control information, a reception quality (CQI) after cancellation of a signal serving as an interference signal and destined for the other user equipment 13, and feeds back the calculated result to the wireless base station 11. Based on this feedback, the wireless base station 11 sets a transmission parameter (MCS) of each piece of the user equipment 12 and 13 using the CQI after the cancellation, and transmits signals intended for respective users through spatial multiplexing after performing power distribution between the users by power scaling.
    • 当对多用户MIMO进行功率缩放时,传输速率的降低被抑制并且传输效率提高。 当通过空中复用将信号从无线基站11发送到多个用户设备12和13时,提供远程用户设备(UE-B)13的传输参数(MCS)的通知作为控制信息 相邻用户设备(UE-A)12。用户设备12基于接收到的控制信息计算在用作干扰信号并发往另一用户设备13的信号的消除之后的接收质量(CQI),以及 将计算结果反馈给无线基站11.基于该反馈,无线基站11在消除之后使用CQI来设置用户设备12和13的每一段的传输参数(MCS),并发送预期的信号 通过功率缩放在用户进行功率分配之后通过空间复用对各个用户进行。
    • 46. 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。
    • 47. 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。