Cooperative Diversity for Intervehicular Communication: Performance Analysis and Optimization
Cooperative Diversity for Intervehicular Communication: Performance Analysis and Optimization
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DOI：
10.1109/tvt.2009.2014685
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发表时间：
2009-09-01
影响因子：
6.8
通讯作者：
Altunbas, Ibrahim
中科院分区：
文献类型：
--
作者：
Ilhan, Haci;Uysal, Murat;Altunbas, Ibrahim
虽然关于协作分集的文献越来越多，但目前的文献主要局限于瑞利衰落信道模型，该模型通常假设在屋顶层以上有固定基站天线而在街道层有移动站的无线通信场景。本文研究了基于级联Nakagami衰落的车载通信协作分集技术。该信道模型提供了车厢间信道的真实描述，其中假设两个或更多个独立的Nakagami衰落过程由围绕两个移动终端的独立散射体群组产生。我们研究了由路边接入点或作为中继站的另一辆车辅助的车间协作方案的放大转发中继的性能。我们的分集分析表明，该协作方案能够提取完全分布的空间分集。我们进一步为所考虑的方案制定了功率分配问题，以优化分配给广播和转播阶段的功率。根据中继器位置的不同，通过优化功率分配可获得高达3分贝的性能提升。
Although there has been a growing literature on cooperative diversity, the current literature is mainly limited to the Rayleigh fading channel model, which typically assumes a wireless communication scenario with a stationary base station antenna above rooftop level and a mobile station at street level. In this paper, we investigate cooperative diversity for intervehicular communication based on cascaded Nakagami fading. This channel model provides a realistic description of an intervehicular channel where two or more independent Nakagami fading processes are assumed to be generated by independent groups of scatterers around the two mobile terminals. We investigate the performance of amplify-and-forward relaying for an intervehicular cooperative scheme assisted by either a roadside access point or another vehicle that acts as a relay. Our diversity analysis reveals that the cooperative scheme is able to extract the full distributed spatial diversity. We further formulate a power-allocation problem for the considered scheme to optimize the power allocated to the broadcasting and relaying phases. Performance gains up to 3 dB are obtained through optimum power allocation, depending on the relay location.