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1. 发明授权

US06987794B1 Receiver and received channel estimation method for the same 失效
标题翻译：接收机和接收信道估计方法相同
公开(公告)号：US06987794B1
公开(公告)日：2006-01-17
申请号：US09589170
申请日：2000-06-08
申请人： Ryuji Kohno , Satoru Ishii , Atsushi Hoshikuki
发明人： Ryuji Kohno , Satoru Ishii , Atsushi Hoshikuki
IPC分类号： H04B1/69 , H04B1/707 , H04B1/713
CPC分类号： H04B1/7156 , H04L2027/0065 , H04L2027/0081
摘要： A receiver is provided that can shorten the time during which initial synchronization is established. When the frequency of an output signal from the PLL 12 is set to the receiving channel corresponding to the transmission channel for a transmission signal, the time-constant switching circuit 17 changes the time constant of the loop filter 14 to a low rate mode. Meanwhile, the output signal frequency from the PLL is swept between the highest frequency and the lowest frequency signal of a frequency channel. Thus, a receiving channel corresponding to the transmission channel is estimated by signals received during the sweeping period so that the initial synchronization is established based on the estimation result. Receiving-channel estimation, to which adverse effects due to multi-path fading are reduced, can be reliably performed by selecting each of plural receiving antennas in time-divisional mode and synthesizing envelopes of received signals from respective antennas.
摘要翻译：提供了可以缩短建立初始同步的时间的接收机。当来自PLL12的输出信号的频率被设置为与传输信号的传输信道相对应的接收信道时，时间常数切换电路17将环路滤波器14的时间常数改变为低速率模式。同时，来自PLL的输出信号频率在频率信道的最高频率和最低频率信号之间扫描。因此，通过在扫描周期期间接收到的信号来估计对应于传输信道的接收信道，从而基于估计结果建立初始同步。通过在时分模式中选择多个接收天线中的每一个并且合成来自各个天线的接收信号的包络，可以可靠地执行通过减少由于多径衰落引起的不利影响的接收信道估计。

2. 发明授权

US5222098A Spectrum spread communication system 失效
标题翻译：频谱传播通信系统
公开(公告)号：US5222098A
公开(公告)日：1993-06-22
申请号：US715395
申请日：1991-06-14
申请人： Michio Yamamoto , Atsushi Hoshikuki
发明人： Michio Yamamoto , Atsushi Hoshikuki
IPC分类号： H04B1/713 , H04B1/692 , H04B1/7156 , H04J13/00
CPC分类号： H04B1/7156 , H04B1/69 , H04B1/692 , H04B2001/71362 , H04B2001/71563
摘要： A spectrum spread communication system capable of ensuring positive synchronization and improving error rate characteristics of data. At least one frequency is subject to hopping at an interval equal to one cycle of a DS signal during one cycle of frequency hopping and a cycle of changing-over of hopping is controlled depending upon an output signal of a correlation device, resulting in accomplishing synchronization.
摘要翻译：一种能够确保正向同步并提高数据误码率特性的频谱扩展通信系统。在跳频的一个周期期间，至少一个频率以等于DS信号的一个周期的间隔进行跳频，并且根据相关设备的输出信号来控制跳变的周期，从而实现同步。

3. 发明授权

US6141392A Receive antenna selection method and diversity receiver 失效
标题翻译：接收天线选择方法和分集接收机
公开(公告)号：US6141392A
公开(公告)日：2000-10-31
申请号：US888234
申请日：1997-07-03
申请人： Atsushi Hoshikuki , Satoru Ishii
发明人： Atsushi Hoshikuki , Satoru Ishii
IPC分类号： H04B1/707 , H04B1/711 , H04B7/08 , H04L1/02
CPC分类号： H04B7/0811 , H04B7/0834
摘要： A receive antenna selection method and a diversity receive capable of preventing a deterioration in transmission efficiency in a multipath environment. A receive antenna for receiving a packet is selected during a period of time for which a preamble section of the packet is received, to thereby keep change-over between packets from being carried out during receiving of the packet. This eliminates a situation that a packet must be nullified due to generation of a bit error by change-over between receive antennas during receiving of the packet, to thereby keep transmission efficiency from being deteriorated even in a multipath environment.
摘要翻译：一种接收天线选择方法和能够防止多路径环境中的传输效率恶化的分集接收。在接收到分组的前导码部分的时间段期间选择用于接收分组的接收天线，从而在分组的接收期间保持在分组之间的切换。这消除了由于在接收分组期间在接收天线之间转换而产生位错误而使分组必须无效的情况，从而即使在多径环境中也保持传输效率不劣化的情况。

4. 发明授权

US5838717A Spectrum spread communication system 失效
标题翻译：频谱传播通信系统
公开(公告)号：US5838717A
公开(公告)日：1998-11-17
申请号：US500748
申请日：1995-07-11
申请人： Satoru Ishii , Atsushi Hoshikuki
发明人： Satoru Ishii , Atsushi Hoshikuki
IPC分类号： H04B1/69 , H04B1/692 , H04B1/7097 , H04B1/719 , H04B1/707
CPC分类号： H04B1/69
摘要： A spectrum spread communication system capable of preventing an increase in error rate irrespective of hit while keeping a communication speed from being reduced. A plurality of input data DS-modulated by a DS spread multiplier are fed to an array converter, wherein a first chip of each of the data is collected to form an FH first frame. Likewise, only second to seventh chips are collected to form FH second to seventh frames, respectively. The FH frames each are then subject to FH modulation in an FH spread multiplier and then transmitted. In a receive section, the data are returned to the original data array after FH demodulation, resulting in a burst error being a random error.
摘要翻译：一种频谱扩展通信系统，其能够防止在保持通信速度降低的同时不受命中的错误率的增加。由DS扩展乘法器DS调制的多个输入数据被馈送到阵列转换器，其中收集每个数据的第一芯片以形成FH第一帧。同样地，仅收集第二至第七芯片以分别形成FH第二至第七帧。然后每个FH帧在FH扩展乘数中进行FH调制，然后发送。在接收部分，在FH解调之后，数据返回到原始数据阵列，导致突发错误是随机误差。

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