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    • 89. 发明授权
    • Asynchronous modulation and demodulation for spread spectrum and code-division multiple access communication
    • 用于扩频和码分多址通信的异步调制和解调
    • US07406066B2
    • 2008-07-29
    • US10684150
    • 2003-10-09
    • Yi ZhengAiping Yao
    • Yi ZhengAiping Yao
    • H04B7/216
    • H04J13/00H04B1/70718H04J13/0022H04J13/16
    • The present invention of the modulation and demondulation removes the carry synchronization requirement for spread spectrum systems and code-division multiple access communication systems. The invention uses the PN codes that are specially selected and asynchronous demodulation procedure. If number of transmitters is limited, the Multiple Access Interference (MAI) due to carry differences of transmitters can be completely cancelled. Using this invention, signal from a desired transmitter can be demodulated and detected from received signals included from other transmitters in multiple access applications, even when the frequencies of transmitters are different from each other and are not synchronized with a receiver. The invention greatly reduces complexities of a wireless system where Code Division Multiple Access (CDMA) or spread spectrum is used. It expands applications of wireless communication. One of the applications is for a CDMA communication for multiple users without a centralized base station.
    • 调制和解调的本发明消除了扩频系统和码分多址通信系统的进位同步要求。 本发明使用特殊选择的PN码和异步解调程序。 如果发射机数量有限,则由于发射机的差异导致的多址干扰(MAI)可以被完全取消。 使用本发明,即使当发射机的频率彼此不同并且与接收机不同步时,来自所需发射机的信号可以从在多个接入应用中的其他发射机所包含的接收信号中进行解调和检测。 本发明大大降低了使用码分多址(CDMA)或扩频的无线系统的复杂性。 它扩展了无线通信的应用。 其中一个应用是用于没有集中式基站的多个用户的CDMA通信。