A Relay Assisted Cooperative Transmission Protocol for Wireless Multiple Access Systems
A Relay Assisted Cooperative Transmission Protocol for Wireless Multiple Access Systems
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DOI：
10.1109/tcomm.2010.062310.080466
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发表时间：
2010-08
影响因子：
8.3
通讯作者：
Z. Ding;K. Leung;D. Goeckel;D. Towsley
中科院分区：
文献类型：
--
作者：
Z. Ding;K. Leung;D. Goeckel;D. Towsley
本文提出了一种适用于多接入场景的频谱高效协作传输协议。它的关键特征是利用多用户分集，充分利用无线电传播的动态性质。具体地说，通过仔细地调度多个源和中继器的传输，到目的地的连接较差的源可以具有更高的优先级，以从具有较好信道条件的中继器获得帮助。因此，即使只有一小部分中继被调度来帮助每个用户，完全分集增益也是可以实现的。我们为所提出的传输协议开发了一个可实现的分集-多路复用折衷方案来辅助性能评估。在中继数较大的情况下，该方案所实现的分集复用折衷能够接近多输入单输出的最优上界。分析和数值结果表明，在大多数情况下，该协议的性能优于其他同类方案。
In this paper, we propose a spectrally efficient cooperative transmission protocol for multiple access scenarios. The key feature is to utilize multi-user diversity and fully exploit the dynamic nature of radio propagation. In particular, by carefully scheduling the multiple sources and relays' transmissions, a source with a poor connection to the destination can have higher priority to obtain help from a relay with better channel condition. As a result, the full diversity gain is achievable even though only a fraction of relays is scheduled to help each user. We developed an achievable diversity-multiplexing tradeoff for the proposed transmission protocol to assist performance evaluation. When the number of relays is large, the diversity-multiplexing tradeoff achieved by the proposed scheme can approximate the optimal multiple-input single-output upper bound. Both analytical and numerical results show that the proposed protocol outperform other comparable schemes in most conditions.