Performance of M ary orthogonal direct sequence code division multiple access ( DS-CDMA) signals over multipath Rayleigh fading channel with noncoherent RAKE receiver is examed. Two maximum selection diversity reception schemes, maximum signal to noise ratio selection and muximum output selection, are considered. 研究了随机M进制正交码直接序列扩频码分多址信号经过多径瑞利频率非选择性衰落,在非相干RAKE接收机中采用最大输出信噪比选择或最大输出选择分集接收时系统的性能;
Narration in code process in television documentary film, entrusted with it in content and form by rhythm, may enhance the television documentary film esthetic value, and has enormous practical significance in realizing invisibility and the effective reception of TV documentary film. 在电视纪录片的叙事编码过程中,给电视纪录片的内容和形式赋予节奏,可以提高电视纪录片的美学价值,对实现纪录片的可视性和有效收视具有较大的意义。
Direct sequence code division multiple access ( DS-CDMA) signals have found wide applications in military and civil communications, which makes the non-cooperative reception of DS-CDMA signals of great significance. 直接序列扩频码分多址(DS-CDMA)信号在军事和民用通信中有着广泛的应用,研究DS-CDMA信号的非合作接收有重要意义。