Receiving a spread spectrum signal
    7.
    发明授权
    Receiving a spread spectrum signal 失效
    接收扩频信号

    公开(公告)号:US06628699B2

    公开(公告)日:2003-09-30

    申请号:US08880637

    申请日:1997-06-23

    IPC分类号: H04B169

    摘要: A receiver for use in a spread spectrum communication system includes the following components: an acquisition system configured to detect a transmitted spread spectrum signal by simultaneously correlating multiple search phases of a reference spreading signal against an output from a receiver channel; a demodulation system configured to recover data embedded in the spread spectrum signal by simultaneously correlating the spread spectrum signal with multiple possible data phases of the reference spreading signal over consecutive data periods; and a bank of correlating devices configured for use both in the acquisition system and in the demodulation system.

    摘要翻译: 用于扩展频谱通信系统的接收机包括以下部件:被配置为通过将参考扩展信号的多个搜索相位与来自接收机信道的输出同时相关联来检测所发送的扩频信号的采集系统; 解调系统,被配置为通过在扩展频谱信号与连续数据周期的参考扩展信号的多个可能的数据相位同时关联来恢复嵌入在扩频信号中的数据; 以及配置为在采集系统和解调系统中使用的一组相关设备。

    Direct sequence spread spectrum system
    9.
    发明授权
    Direct sequence spread spectrum system 失效
    直接序列扩频系统

    公开(公告)号:US5661750A

    公开(公告)日:1997-08-26

    申请号:US473011

    申请日:1995-06-06

    申请人: Forrest F. Fulton

    发明人: Forrest F. Fulton

    IPC分类号: H04B1/707 H04L27/18 H04K1/00

    CPC分类号: H04L27/18 H04B1/707

    摘要: A direct-sequence spread spectrum communication system using a high power transmitter and a short spreading sequence which still satisfies FCC Rule 15.247 regarding power density. In addition to the spreading sequence, the carrier signal is modulated with a phase reversal sequence. Typically, each period of the phase reversal sequence has a duration equal to the total duration of the spreading sequence. The phase reversal sequence reduces the maximum power density of the signal, but is transparent to a receiver.

    摘要翻译: 一种使用高功率发射机和短扩频序列的直接序列扩频通信系统,其仍然符合FCC规则15.247关于功率密度。 除了扩展序列之外,载波信号用相位反转序列调制。 通常,相位反转序列的每个周期的持续时间等于扩展序列的总持续时间。 相位反转序列降低了信号的最大功率密度,但对接收机是透明的。

    Frequency synchronized bidirectional radio system
    10.
    发明授权
    Frequency synchronized bidirectional radio system 失效
    频率同步双向无线电系统

    公开(公告)号:US5377232A

    公开(公告)日:1994-12-27

    申请号:US818693

    申请日:1992-01-09

    摘要: A bidirectional radio system for low cost, high through-put accumulation of data from a large number of site units. The site units are connected to remote radio transceivers in radio communication with a plurality of base stations. Accurate frequency synchronization allows multiple carriers within a 12.5 kHz FCC bandwidth. Frequency synchronization is achieved at low cost by transmitting a high accuracy carrier and clock signal at a base station, and using receiving circuitry a remote stations to extract the base clock signal and base carrier frequency and a phase-lock loop to stabilize the remote station carriers. The reception circuitry at a remote station provides independent carrier frequency and clock rate recovery, a phase-lock loop at baseband, and a coarse clock rate recovery circuit coupled to a fine clock rate recovery circuit. Remote station responses are time domain multiplexed. A base station receiver can decode a very short remote station response by scaling the response with the phase and amplitude of an initial segment of the response. Spatial reuse of carrier frequencies further increases the rate of data through-put.

    摘要翻译: 一种双向无线电系统,用于从大量现场单元的低成本,高通量累积数据。 站点单元连接到与多个基站进行无线电通信的远程无线电收发机。 精确的频率同步允许12.5 kHz FCC带宽内的多个载波。 通过在基站发送高精度载波和时钟信号,并且使用接收电路,远程站提取基本时钟信号和基本载波频率以及锁相环路以稳定远程站载波,以低成本实现频率同步 。 远程站的接收电路提供独立的载波频率和时钟速率恢复,基带上的锁相环以及耦合到精细时钟速率恢复电路的粗略时钟速率恢复电路。 远程站响应是时域多路复用的。 基站接收机可以通过响应的初始段的相位和幅度缩放响应来解码非常短的远程站响应。 载波频率的空间重用进一步提高了数据吞吐率。