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首页> 外文期刊>Annales des Telecommunications >Performance analysis of cross layer design with imperfect channel information in distributed antenna systems
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Performance analysis of cross layer design with imperfect channel information in distributed antenna systems

机译：分布式天线系统中信道信息不完善的跨层设计性能分析

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摘要

In this paper, based on the imperfect channel state information (CSI), a cross layer design (CLD) scheme is developed for distributed antenna system (DAS) by combining adaptive modulation (AM) at the physical layer and automatic repeat request (ARQ) at the data link layer. The performance of DAS with CLD is investigated over composite fading channel which considers large-scale path loss and small-scale Rayleigh fading. With the performance analysis, the probability density function of the estimated signal-to-noise ratio (SNR) is derived, and then, the switching thresholds under a target packet error rate constraint are further derived. According to these results, and using numerical calculation, the closed form analytical expressions of average packet error rate and spectrum efficiency of DAS with CLD are, respectively, achieved, which will provide better evaluation way for the DAS performance. To decrease the performance loss caused by the conventional single estimation in the presence of imperfect CSI, the multi-estimation method is proposed to increase the system performance by exploiting previous channel estimation information. Numerical results corroborate our theoretical analysis, and the simulation is in consistence with the theoretical result. Moreover, the system performance can be increased by decreasing the estimation error and/or path loss. Especially, the multi-estimation method can enhance the performance effectively and enable the system to tolerate large estimation errors.
机译：本文基于不完善的信道状态信息（CSI），通过结合物理层的自适应调制（AM）和自动重发请求（ARQ）为分布式天线系统（DAS）开发了跨层设计（CLD）方案。在数据链路层。在考虑了大规模路径损耗和小规模瑞利衰落的复合衰落信道上，研究了具有CLD的DAS的性能。通过性能分析，得出估计信噪比（SNR）的概率密度函数，然后进一步得出目标包错误率约束下的切换阈值。根据这些结果，并利用数值计算，分别得到了带有CLD的DAS的平均误包率和频谱效率的闭合形式的解析表达式，这将为DAS的性能提供更好的评​​估方法。为了减少存在不完善CSI时由传统的单次估计导致的性能损失，提出了一种多估计方法，通过利用先前的信道估计信息来提高系统性能。数值结果证实了我们的理论分析，并且仿真结果与理论结果相符。此外，可以通过减小估计误差和/或路径损耗来提高系统性能。特别是，多重估计方法可以有效地提高性能，并使系统能够承受较大的估计误差。

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