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首页> 外文期刊>EURASIP journal on applied signal processing >Performance of Reverse-Link Synchronous DS-CDMA System on a Frequency-Selective Multipath Fading Channel with Imperfect Power Control
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Performance of Reverse-Link Synchronous DS-CDMA System on a Frequency-Selective Multipath Fading Channel with Imperfect Power Control

机译：功率控制不完善的频率选择性多径衰落信道上反向链路同步DS-CDMA系统的性能

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摘要

We analyze the performance for reverse-link synchronous DS-CDMA system in a frequency-selective Rayleigh fading channel with an imperfect power control scheme. The performance degradation due to power control error (PCE), which is approximated by a log-normally distributed random variable, is estimated as function of the standard deviation of the PCE. In addition, we investigate the impacts of the multipath intensity profile (MIP) shape and the number of resolvable paths on the performance. Finally, the coded bit error performance is evaluated in order to estimate the system capacity. Comparing with the conventional CDMA system, we show an achievable gain of from 59% to 23% for reverse-link synchronous transmission technique (RLSTT) in the presence of imperfect power control over asynchronous transmission for BER = 10~(-6). As well, the effect of tradeoff between orthogonality and diversity can be seen according to the number of multipaths, and the tendency is kept even in the presence of PCE. We conclude that the capacity can be further improved via the RLSTT, because the DS-CDMA system is very sensitive to power control imperfection.
机译：我们分析了具有不完善功率控制方案的选频瑞利衰落信道中反向链路同步DS-CDMA系统的性能。估计由于功率控制误差（PCE）而导致的性能下降，该误差由对数正态分布的随机变量估算，是PCE标准偏差的函数。此外，我们研究了多路径强度分布图（MIP）形状和可解决路径数量对性能的影响。最后，评估编码误码性能，以估计系统容量。与常规的CDMA系统相比，在BER = 10〜（-6）的情况下，对于异步传输的功率控制不完善，反向链路同步传输技术（RLSTT）可获得59％至23％的可实现增益。同样，可以根据多径的数量看到正交性和多样性之间折衷的效果，并且即使在存在PCE的情况下也可以保持这种趋势。我们得出结论，因为DS-CDMA系统对功率控制缺陷非常敏感，所以可以通过RLSTT进一步提高容量。

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