Diversity Combining Considerations for Incoherent Frequency Hopping Multiple Access Systems
Diversity Combining Considerations for Incoherent Frequency Hopping Multiple Access Systems
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DOI：
10.1109/49.345878
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发表时间：
1995-02
期刊：
影响因子：
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通讯作者：
C. Hung;Y. Su
中科院分区：
文献类型：
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作者：
C. Hung;Y. Su
本文研究了跳频多址(FHMA)系统的分集合并问题，该系统工作在具有频率非选择性莱斯多径衰落的移动卫星环境中。所考虑的调制方案是非相干M进制频移键控(MFSK)。在系统活跃用户数(K)已知、所有用户是码片(跳)同步的、每个用户使用随机跳频地址的假设下，推导了最优分集合并规则。我们提出了接近最优规则的实际实现方案，并研究了各种系统参数对结果接收器的影响。对误码率性能进行了分析，并给出了数值算例。分析了分集阶数(L)、信令大小(M)和接收功率不等对系统性能的影响，并对系统容量和频谱效率等相关系统设计问题进行了评估。>；
This paper studies the problem of diversity combining for frequency hopped multiple access (FHMA) systems that operate in a mobile satellite environment characterized by frequency-nonselective Rician multipath fading. The modulation scheme considered is the incoherent M-ary frequency-shift keying (MFSK). The optimal diversity combining rule is derived under the assumptions that the number of active users (K) in the system is known, all users are chip (hop)-synchronous, and each user employs a random FH address. We suggest practical implementations that are close approximations of the optimal rule and examine the effects of various system parameters on the resulting receivers. The bit error probability performance is analyzed and numerical examples are provided. The effects of the diversity order (L), the signaling size (M) and unequal received powers are examined and related system design concerns such as system capacity and spectral efficiency are evaluated as well. >