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    • 11. 发明授权
    • Coherent detector and a coherent detection method for a digital
communication receiver
    • 相干检测器和数字通信接收机的相干检测方法
    • US5692015A
    • 1997-11-25
    • US553464
    • 1995-11-28
    • Akihiro HigashiFumiyuki AdachiKoji OhnoMamoru Sawahashi
    • Akihiro HigashiFumiyuki AdachiKoji OhnoMamoru Sawahashi
    • H04L7/08H04L25/02H03D1/00H04L27/06
    • H04L25/0236H04L25/0212H04L25/0232H04L7/08
    • A coherent detection method including a step of estimating a transfer function of a propagation path using pseudo-pilot signals which consist of some information symbols adjacent to pilot signals. The information symbols in the pseudo-pilot signals are assumed to be known. The method includes the steps of estimating the transfer functions using the pilot signals, carrying out interpolation coherent detection of the information symbols using the estimated transfer functions, storing the detection results as the pseudo-pilot signals, reestimating the transfer functions associated with the information symbols corresponding to the pseudo-pilot signals by using the pseudo-pilot signals and the corresponding received signal under the assumption that the pseudo-pilot signals have a known correct pattern, and carrying out the interpolation coherent detection of the individual information symbols by using the transfer functions obtained by the reestimation. This makes it possible to estimate the transfer function at high accuracy with a small number of symbols per pilot signal, thereby improving the detection characteristics.
    • PCT No.PCT / JP95 / 01229 Sec。 371日期:1995年11月28日 102(e)1995年11月28日日期PCT 1995年6月21日PCT PCT。 公开号WO95 / 35615 日期1995年12月28日一种相干检测方法,包括使用由与导频信号相邻的一些信息符号组成的伪导频信号来估计传播路径的传递函数的步骤。 伪导频信号中的信息符号被认为是已知的。 该方法包括以下步骤:使用导频信号估计传递函数,使用估计的传递函数执行信息符号的内插相关检测,将检测结果存储为伪导频信号,重新估计与信息符号相关联的传递函数 在伪导频信号具有已知正确模式的假设下,通过使用伪导频信号和相应的接收信号对应于伪导频信号,并且通过使用传输来执行个体信息符号的内插相关检测 通过重新获得的功能。 这使得可以以每个导频信号的少量符号高精度地估计传递函数,从而提高检测特性。
    • 12. 发明授权
    • Receiver and repeater for spread spectrum communications
    • 接收机和中继器用于扩频通信
    • US5652765A
    • 1997-07-29
    • US411645
    • 1995-05-22
    • Fumiyuki AdachiMamoru SawahashiAkihiro HigashiKoji OhnoTomohiro Dohi
    • Fumiyuki AdachiMamoru SawahashiAkihiro HigashiKoji OhnoTomohiro Dohi
    • H04B1/707H04B7/06H04B7/08H04B3/36H04B7/17H04B17/02H04L25/20
    • H04B7/0894H04B1/712H04B7/0671
    • A repeater improving the effect of a RAKE reception. A received signal from a base station parallelly passes a first path including a first delay circuit and a second path including no delay circuit, and is transmitted to a mobile station. A received signal from the mobile station parallelly passes a third path including a second delay circuit and a fourth path including no delay circuit, and is transmitted to the base station. The delay time of the delay circuits are set at one chip interval or more of a spreading code. This forcedly produces multipath waves which are resolvable by a RAKE receiver. The RAKE receiver estimates amplitudes of desired wave components for individual delayed waves, performs weighting of the respective delayed wave components from detectors by using the estimated amplitudes, and makes symbol decision in terms of the combined weighted signal.
    • PCT No.PCT / JP94 / 01283第 371日期:1995年5月22日 102(e)日期1995年5月22日PCT 1994年8月4日PCT PCT。 第WO95 / 05037号公报 日期1995年2月16日中继器改善RAKE接收的效果。 来自基站的接收信号并行地通过包括第一延迟电路和不包括延迟电路的第二路径的第一路径,并被发送到移动站。 来自移动站的接收信号并行地通过包括第二延迟电路的第三路径和不包括延迟电路的第四路径,并且被发送到基站。 延迟电路的延迟时间设定为扩展码的一个码片间隔或更多个码片间隔。 这强制产生可由RAKE接收机解析的多径波。 RAKE接收机估计各个延迟波的期望波分量的振幅,通过使用估计的幅度对来自检测器的各个延迟波分量进行加权,并根据组合的加权信号进行符号判定。
    • 13. 发明授权
    • Transmission power control method and a communication system using the
same
    • 传输功率控制方法及使用该方法的通信系统
    • US5566165A
    • 1996-10-15
    • US439302
    • 1995-05-11
    • Mamoru SawahashiNarumi UmedaTomohiro DohiKoji Ohno
    • Mamoru SawahashiNarumi UmedaTomohiro DohiKoji Ohno
    • H04W16/24H04B7/005H04B7/26H04J13/00H04W52/04H04W52/14H04W52/24H04W52/34
    • H04W52/146H04W52/241H04W52/248H04W52/343Y02B60/50
    • A transmission power control method for a CDMA system including the steps of calculating an actual SIR (Signal-to-Interference Ratio) of a desired signal; deciding whether the actual SIR is greater than a predetermined reference SIR which satisfies a predetermined conununication quality; forming a transmission power control bit on the basis of a result of deciding; inserting the transmission power control bit periodically into a forward frame, which steps are performed at the base station, and steps of calculating tentative reverse transmission power in accordance with the transmission power control bit in the forward frame; deciding reverse transmission power such that the reverse transmission power is made equal to the tentative reverse transmission power when the tentative reverse transmission power is less than a predetermined maximum transmission power, but otherwise made equal to the predetermined maximum transmission power; and transmitting a signal from the mobile station to the base station at the reverse transmission power, which steps are performed at the mobile station. This makes it possible to prevent the transmission power from diverging to the maximum output of a transmitter power amplifier.
    • 一种用于CDMA系统的发射功率控制方法,包括以下步骤:计算期望信号的实际SIR(信号与干扰比); 确定实际SIR是否大于满足预定协调质量的预定参考SIR; 基于决定结果形成发送功率控制位; 将发送功率控制位周期性地插入前向帧,在基站执行哪些步骤,以及根据前向帧中的发送功率控制比特来计算暂定反向发送功率的步骤; 确定反向传输功率,使得当临时反向传输功率小于预定的最大传输功率时,反向传输功率等于暂定反向传输功率,但是否则等于预定的最大传输功率; 并且以所述反向发射功率从所述移动台向所述基站发送信号,所述步骤在所述移动台执行。 这使得可以防止发射功率发散到发射机功率放大器的最大输出。
    • 17. 发明授权
    • Centralized control using different base stations for uplink and downlink mobile communications
    • 集中控制使用不同的基站进行上行和下行移动通信
    • US08971897B2
    • 2015-03-03
    • US13000304
    • 2009-06-22
    • Motohiro TannoMamoru SawahashiYoshihisa Kishiyama
    • Motohiro TannoMamoru SawahashiYoshihisa Kishiyama
    • H04W36/18H04W72/08H04W36/30
    • H04W36/18H04W36/30H04W72/085
    • A centralized-control base station connected to a first transceiving unit and a second transceiving unit includes a first signal quality obtaining unit configured to obtain both uplink signal quality from a mobile station to the first transceiving unit and downlink signal quality from the first transceiving unit to the mobile station; a second signal quality obtaining unit configured to obtain both uplink signal quality from the mobile station to the second transceiving unit and downlink signal quality from the second transceiving unit to the mobile station; and a control unit configured to allow downlink data to be transmitted from the first transceiving unit, downlink feedback information to be received by the second transceiving unit, uplink data to be received by the second transceiving unit, and uplink feedback information to be transmitted from the first transceiving unit, when the downlink signal quality from the first transceiving unit to the mobile station is better than the downlink signal quality from the second transceiving unit to the mobile station and the uplink signal quality from the mobile station to the second transceiving unit is better than the uplink signal quality from the mobile station to the first transceiving unit.
    • 连接到第一收发单元和第二收发单元的集中控制基站包括:第一信号质量获取单元,被配置为获得从移动站到第一收发单元的上行链路信号质量以及从第一收发单元到下行链路信号质量 移动台; 第二信号质量获取单元,被配置为获得从所述移动站到所述第二收发单元的上行链路信号质量以及从所述第二收发单元到所述移动站的下行链路信号质量; 以及控制单元,被配置为允许从第一收发单元发送下行链路数据,要由第二收发单元接收的下行链路反馈信息,要由第二收发单元接收的上行链路数据以及要从第二收发单元发送的上行链路反馈信息 第一收发单元,当从第一收发单元到移动站的下行链路信号质量优于从第二收发单元到移动站的下行链路信号质量,并且从移动站到第二收发单元的上行链路信号质量较好时 比从移动站到第一收发单元的上行链路信号质量。