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    • 5. 发明申请
    • WIRELESS LOCAL AREA NETWORK SPREAD SPECTRUM TRANSCEIVER WITH MULTIPATH INTERFERENCE MITIGATION
    • 无线本地区域网络传输频谱收发器具有多路干扰减轻
    • WO9946887A3
    • 1999-10-21
    • PCT/US9900852
    • 1999-01-15
    • HARRIS CORPANDREN CARLWEBSTER MARK A
    • ANDREN CARLWEBSTER MARK A
    • H04L27/00H04B1/707H04B7/08H04B7/26H04L12/28H04L12/56H04L25/03H04L27/227H04L27/233H04L27/38
    • H04L27/2332H04B1/707H04B1/709H04B7/08H04B7/0811H04L25/03057H04L25/03267H04L27/2273H04L2025/03401H04L2025/0349H04W84/12H04W88/02
    • A demodulator used in a base band processor of the spread spectrum radio transceiver includes a demodulator circuit for spread spectrum phase shift keying (PSK) demodulating an information signal received from a radio circuit. The information signal includes data symbols formed from a plurality of high rate mode chips forming a spread spectrum information signal. At least one predetermined code function correlator is in line with a signal input for decoding the information signal according to a predetermined code. A carrier loop circuit allows phase and frequency tracking of the information signal and a chip decision circuit is operative with the carrier loop circuit for tracking high rate mode chips. A decision feedback equalizer formed from a feedback finite impulse response filter is operative with the chip decision circuit and the carrier loop circuit. It has a plurality of feedback taps. At least one feedback tap is selected for logical add/subtract operations to aid in canceling multipath signal echoes. A feed forward finite impulse response filter can also be positioned in line to the code function correlator and the signal input and has a plurality of feed forward taps that are selected for logical multiply operations to aid in reducing multipath signal echoes. A method aspect of the invention is also disclosed.
    • 在扩频无线电收发机的基带处理器中使用的解调器包括解调从无线电电路接收的信息信号的扩展频谱相移键控(PSK)的解调器电路。 信息信号包括由形成扩频信息信号的多个高速率模式芯片形成的数据符号。 至少一个预定代码函数相关器与根据预定代码对信息信号进行解码的信号输入相一致。 载波回路允许信号信号的相位和频率跟踪,并且芯片判定电路与用于跟踪高速率模式芯片的载波回路电路一起工作。 由反馈有限脉冲响应滤波器形成的判决反馈均衡器与芯片判决电路和载波回路电路一起工作。 它有多个反馈抽头。 为逻辑加/减操作选择至少一个反馈抽头,以帮助消除多径信号回波。 前馈有限脉冲响应滤波器还可以被定位成与码功能相关器和信号输入一致,并且具有多个前馈抽头,其被选择用于逻辑乘法运算以帮助减少多径信号回波。 还公开了本发明的方法方面。