Uplink Throughput of TDMA Cellular Systems with Multicell Processing and Amplify-and-Forward Cooperation Between Mobiles
Uplink Throughput of TDMA Cellular Systems with Multicell Processing and Amplify-and-Forward Cooperation Between Mobiles
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DOI：
10.1109/twc.2007.051026
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发表时间：
2007-08
影响因子：
10.4
通讯作者：
O. Simeone;O. Somekh;Y. Bar-Ness;U. Spagnolini
中科院分区：
文献类型：
--
作者：
O. Simeone;O. Somekh;Y. Bar-Ness;U. Spagnolini
基站之间的协作和移动的终端之间的协作传输是当前作为下一代通信系统的有希望的范例而正在研究的两种技术。在本文中，我们提供了第一个期待这两种方法之间的相互作用，通过研究每个小区可实现的总和速率（吞吐量）的不同的合作协议下的一个简化模型的TDMA蜂窝系统的上行链路。分析仅限于终端之间的非再生（放大和转发）合作方案，因为它们的简单性和吸引力的实际实现。对于AWGN（即，无衰落）场景。此外，衰落的影响进行了数值研究，允许得出一些结论的影响，多小区分集（或宏分集）的终端之间的协作计划的性能。特别是，我们表明，虽然AF合作通常有利于单细胞处理（即，在基站之间没有协作），当与多小区处理结合时，其益处限于低到中等传输速率的范围。
Cooperation between base stations and collaborative transmission between mobile terminals are two technologies currently under study as promising paradigms for next generation communications systems. In this paper, we provide a first look to the interplay between these two approaches by studying the per-cell achievable sum-rate (throughput) of different cooperative protocols under a simplified model for the uplink of a TDMA cellular system. The analysis is limited to non-regenerative (amplify-and-forward) cooperation schemes between terminals for their'simplicity and appeal to a practical implementation. A closed form expression for the (asymptotic) achievable rate of multicell processing combined with amplify-and-forward collaboration at the terminals is derived for an AWGN (i.e., no fading) scenario. Moreover, the impact of fading is investigated numerically, allowing to draw some conclusions on the impact of multicell diversity (or macrodiversity) on the performance of collaborative schemes among the terminals. In particular, we show that while AF cooperation is generally advantageous for single cell processing (i.e., with no collaboration between base stations), its benefits when combined with multicell processing are limited to the regime of low to moderate transmission rates.