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首页> 外文期刊>IEICE Transactions on Communications >Maximizing the Effective Channel Capacity of Power Controlled WCDMA Systems under Rayleigh Fading Environments
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Maximizing the Effective Channel Capacity of Power Controlled WCDMA Systems under Rayleigh Fading Environments

机译：在瑞利衰落环境下最大化功率控制WCDMA系统的有效信道容量

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摘要

This paper studies the optimization of the effective channel capacity of wideband code division multiple access (WCDMA) systems under Rayleigh fading environments. Firstly, the results for Shannon capacity of fading channels with channel side information are reviewed, where the capacity is achieved by using an optimal power control scheme. Secondly, an optimal interference threshold α_0~* is set for a given system outage probability P_(out) to minimize total interference. Finally, the effective channel capacity of WCDMA is defined and a target SIR level γ~* is derived with the Lagrangian multiplier method to maximize the effective channel capacity. It is shown that α_0~* is dependent on the power control interference ratio (PCIR) ρ, the number of diversity paths identified by the receiver M, and the outage probability of the system. Simulation results are provided to validate the theoretical deductions. We conclude that the total effective channel capacity will be maximized as long as M ≥ 4, and ρ ≤ 0.5 for a proper value of α_0~*.
机译：本文研究了瑞利衰落环境下宽带码分多址（WCDMA）系统有效信道容量的优化。首先，回顾了具有信道侧信息的衰落信道的香农容量的结果，该容量是通过使用最佳功率控制方案来实现的。其次，针对给定的系统中断概率P_（out）设置最佳干扰阈值α_0〜*，以使总干扰最小。最后，定义了WCDMA的有效信道容量，并使用拉格朗日乘数法得出目标SIR等级γ〜*，以使有效信道容量最大化。结果表明，α_0〜*取决于功率控制干扰比（PCIR）ρ，接收机M标识的分集路径的数量以及系统的中断概率。提供仿真结果以验证理论推论。我们得出结论，对于适当的值α_0〜*，只要M≥4，并且ρ≤0.5，总的有效信道容量将最大化。

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