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    • 5. 发明授权
    • Direct-sequence spread-spectrum communication system
    • 直接序列扩频通信系统
    • US5689525A
    • 1997-11-18
    • US511271
    • 1995-08-04
    • Minako TakeishiKen IkedaKenichi Takahashi
    • Minako TakeishiKen IkedaKenichi Takahashi
    • H04B1/707H04B1/7073H04K1/00
    • H04B1/707H04B1/709
    • A clock signal generator produces a basic clock signal. A variable delay device is operative for delaying the basic clock signal by an adjustable interval and thereby converting the basic clock signal into a delay-resultant clock signal. A pseudo-noise code is generated at a timing depending on the delay-resultant clock signal. A spread-spectrum information signal is despread into a non-spread information signal in response to the pseudo-noise code. A correlator detects a correlation between the spread-spectrum information signal and the pseudo-noise code. The adjustable interval provided by the variable delay device is controlled in response to the detected correlation to provide synchronization between the spread-spectrum information signal and the pseudo-noise code.
    • 时钟信号发生器产生基本时钟信号。 可变延迟装置用于将基本时钟信号延迟可调间隔,从而将基本时钟信号转换成延迟结果时钟信号。 在根据延迟结果时钟信号的定时产生伪噪声码。 响应于伪噪声码,扩频信息信号被解扩展成非扩展信息信号。 相关器检测扩频信息信号和伪噪声码之间的相关性。 响应于检测到的相关性来控制可变延迟装置提供的可调节间隔,以提供扩频信息信号和伪噪声码之间的同步。
    • 10. 发明授权
    • Wireless data communication system
    • 无线数据通信系统
    • US5583852A
    • 1996-12-10
    • US360620
    • 1994-12-21
    • Ken IkedaKenichi TakahashiMinako Takeishi
    • Ken IkedaKenichi TakahashiMinako Takeishi
    • H04B7/26H04L12/28H04W16/28H04W16/30H04W16/32H04W24/00H04W24/10H04W36/06H04W48/08H04W56/00H04W64/00H04W72/00H04W72/04H04W76/02H04W84/08H04Q11/04
    • H04B1/7075H04W48/08H04W24/00H04W24/10H04W64/006H04W72/00
    • A wireless data communication system comprises: base stations located to have cells arranged equidistantly therebetween; mobile units, each being located within either of the cells, each of the base stations communicating with mobile units within its cell through plural channels provided by FDM. In the system, each of the base station may comprise a detector for monitoring the channels and detecting a free channel, and a transmission portion for continuously transmitting a signal including data indicative of the detected free channel. In the system, the plurality of channels used in one of cells have given frequency bands respectively which are the same as given frequency bands in other cells. In the system, each of the mobile stations may comprise a chip synchronizing circuit for effecting chip synchronizing between the each of the mobile stations and its base station. In that system, a mobile unit having an antenna whose directivity is controllable, measures distances to determine a direction to its base station with measured distances and received distance from other mobile unit. In that system, a channel with an interference is detected and inhibited to be used and data indicative of the channel with the interference may be stored in a memory and the absence of the interference may be detected and the memory is renewed.
    • 一种无线数据通信系统包括:基站位于具有等距离地间隔的小区; 每个移动单元位于任一小区内,每个基站通过由FDM提供的多个信道与小区内的移动单元通信。 在该系统中,基站中的每一个可以包括用于监视信道和检测空闲信道的检测器,以及用于连续发送包括表示检测到的空闲信道的数据的信号的发送部分。 在系统中,在一个小区中使用的多个信道分别具有与其他小区中的给定频带相同的频带。 在该系统中,每个移动站可以包括用于在每个移动台及其基站之间进行码片同步的码片同步电路。 在该系统中,具有方向性可控的天线的移动单元测量距离,以确定具有测量距离的距离和与其他移动单元的接收距离到其基站的方向。 在该系统中,检测并禁止具有干扰的信道,并且指示具有干扰的信道的数据可以存储在存储器中,并且可以检测不存在干扰并更新存储器。