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    • 3. 发明授权
    • Receiver for spread spectrum communication
    • 接收机用于扩频通信
    • US5724381A
    • 1998-03-03
    • US531341
    • 1995-09-20
    • Chisato EndoNaoyuki YamadaTsutayuki ShibataMasanori MiyashitaYoshimi Kitazumi
    • Chisato EndoNaoyuki YamadaTsutayuki ShibataMasanori MiyashitaYoshimi Kitazumi
    • H04B1/707H04B1/7075H04K1/00
    • H04B1/7075H04B1/709
    • A differential detector (2) reproduces a spreading code (S2) of a received signal (S1). A digital correlator (4) calculates a correlation value between the reproduced spreading code (S2) and a reference spreading code (S3) by collating bit by bit. The timing when the correlation value exceeds a predetermined threshold value (D2) means that the reproduced spreading code (S2) and the reference spreading code (S3) match in phase. A phase of the reproduced spreading code (S2), or a phase of the received signal (S1), is discriminated at that timing. A multiplier (8) outputs a modulated signal (S6) by multiplying the received signal (S1) bit by bit in phase by a spreading code (S5) which has the same code as the reference spreading code (S3). In result, a spreading code with an accurate code sequence and phase is obtained for despreading, and theoretical process-gain is obtained.
    • 差分检测器(2)再现接收信号的扩展码(S2)(S1)。 数字相关器(4)通过逐比较来计算再现的扩展码(S2)和参考扩展码(S3)之间的相关值。 当相关值超过预定阈值(D2)时的定时意味着再现的扩展码(S2)和参考扩展码(S3)同相匹配。 在该定时,区分再生扩展码(S2)的相位或接收信号(S1)的相位。 乘法器(8)通过将接收信号(S1)逐位乘以具有与参考扩展码相同的码的扩展码(S5),输出调制信号(S6)(S3)。 结果,获得具有精确代码序列和相位的扩展码用于解扩,并获得理论处理增益。