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    • 10. 发明授权
    • Spread-spectrum receiver with fast M-sequence transform
    • 具有快速M序列变换的扩频接收机
    • US07433391B2
    • 2008-10-07
    • US11681759
    • 2007-03-03
    • James F. StaffordScott A. McDermottWilliam F. Seng
    • James F. StaffordScott A. McDermottWilliam F. Seng
    • H04B1/69H04B1/707H04B1/713
    • H04B1/7093H04B2001/70935
    • A receiving system dynamically searches a communications band for transmissions of messages having the same nominal communications parameters, including the use of the same spreading code, but having potentially different specific frequencies and code-phases. The receiver samples the communications band at each code-phase of the spreading code over a span of down-converted transmission frequencies. When a message element is detected at a particular code-phase and frequency, it is forwarded to a demodulator that demodulates the message and sends it to its intended destination. This technique allows each transmitter to be independent of the receiver. In a preferred embodiment of this invention, a Fast M-Sequence Transform (a Walsh-Hadamard Transform) is used to determine the power level at multiple code-phases at a given frequency in parallel, thereby substantially reducing the time required to search for transmissions at each discrete code-phase.
    • 接收系统动态地搜索通信频带中具有相同标称通信参数的消息的传输,包括使用相同的扩展码,但具有潜在不同的特定频率和码相位。 接收机在扩展码的每个代码阶段通过下变频传输频率的跨度对通信频带进行采样。 当在特定码相和频率处检测到消息元素时,它被转发到解调器,解调器将其发送到其预定的目的地。 这种技术允许每个发射机独立于接收机。 在本发明的优选实施例中,使用快速M序列变换(沃尔什 - 哈达马夫变换)来以给定频率并行确定多个码相的功率电平,从而大大减少搜索传输所需的时间 在每个离散代码阶段。