A packet reception model for cooperative relaying diversity in wireless multi-cell networks

R. Sámano-Robles, A. Gameiro
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引用次数: 5

Abstract

Conventional abstraction models of physical-layer algorithms have been proven inaccurate for the cross-layer design of wireless networks with cooperative relaying diversity. To partially fill this gap, this paper proposes an enhanced packet reception model to assist in the cross-layer design of physical and link-layer algorithms with cooperative relaying diversity. The analysis is mainly focused on algorithms where relaying-phases are activated whenever a packet error is detected in previous transmissions. A simplification of this model is proposed by assuming that correct reception is achieved whenever the instantaneous signal-to-interference-plus-noise ratio (SINR) surpasses a given threshold. By further assuming operation in Rayleigh channels, reception probabilities are derived in useful closed-form expressions. This novel result is then used to confirm that cooperative diversity in multi-cell environments with fixed and distributed relays considerably outperforms conventional approaches in terms of throughput and power consumption, particularly for users located near the nodes and at the edge of the cell. Finally, average delay is evaluated using an M/G/1 queue model which shows that relaying phases have a minor but finite impact on the waiting time of each user.
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无线多小区网络中协同中继分集的分组接收模型
传统的物理层算法抽象模型在具有协同中继分集的无线网络跨层设计中被证明是不准确的。为了部分填补这一空白,本文提出了一种增强的分组接收模型,以协助具有协作中继分集的物理层和链路层算法的跨层设计。分析主要集中在当在先前的传输中检测到数据包错误时激活中继阶段的算法上。通过假设只要瞬时信噪比(SINR)超过给定阈值,就能实现正确的接收,提出了该模型的简化。通过进一步假设在瑞利信道中的操作,接收概率以有用的封闭形式表达式导出。这一新颖的结果随后被用来证实,在具有固定和分布式中继的多小区环境中,合作分集在吞吐量和功耗方面明显优于传统方法,特别是对于位于节点附近和小区边缘的用户。最后,使用M/G/1队列模型对平均延迟进行了评估,该模型表明中继阶段对每个用户的等待时间影响很小,但影响有限。
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