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首页> 外文期刊>International journal of communication systems >Optimum processing gain for a hybrid direct sequence/slow frequency hopping code division multiple access cellular system over Rayleigh fading channels: the direct sequence/slow frequency hopping code division multiple access case
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Optimum processing gain for a hybrid direct sequence/slow frequency hopping code division multiple access cellular system over Rayleigh fading channels: the direct sequence/slow frequency hopping code division multiple access case

机译：瑞利衰落信道上混合直接序列/慢跳频码分多址蜂窝系统的最佳处理增益：直接序列/慢跳频码分多址情况

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摘要

In this paper, the optimum value of the processing gain of a hybrid direct sequence/slow frequency hopping code division multiple access cellular system, when operating in a Rayleigh fading environment, is examined. The optimization is based on the maximization of the average spectral efficiency achieved, expressed in bits per second per Hertz, which is estimated in terms of the achievable average channel capacity (in the Shannon-Hartley theorem sense) per user during the operation over a broadcast cellular time-varying link. The analysis leads to a simple theoretical novel closed-form expression for the optimal processing gain that is related with the system's parameters but becomes independent of hopping frequencies assigned to each system's cell. Finally, the expression derived can be useful for the practical design of a direct sequence/slow frequency hopping code division multiple access cellular system and for an initial quantitative analysis. Numerical results are presented to illustrate the presented analysis.
机译：在本文中，研究了在瑞利衰落环境中工作时，混合直接序列/慢跳频码分多址蜂窝系统的处理增益的最佳值。该优化基于最大化的平均频谱效率，以每秒每赫兹的比特数表示，根据广播操作中每个用户可实现的平均信道容量（在Shannon-Hartley定理意义上）进行估算蜂窝时变链路。通过分析，可以得出一种简单的理论上新颖的闭式表达式，以获得与系统参数有关的最佳处理增益，但与分配给每个系统单元的跳跃频率无关。最后，导出的表达式可用于直接序列/慢频跳频码分多址蜂窝系统的实际设计和初始定量分析。给出数值结果以说明所提出的分析。

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