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arXiv 0908.4208cs.ITmath.IT
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半双工单中继协议在慢衰落信道下的性能分析:解码或量化转发

Performance Analysis over Slow Fading Channels of a Half-Duplex Single-Relay Protocol: Decode or Quantize and Forward

Nassar Ksairi, Philippe Ciblat, Pascal Bianchi, Walid Hachem

摘要:

在这项工作中,一个新的静态中继协议介绍了半双工单中继网络,其性能进行了研究的背景下,通信慢衰落无线信道。所提出的协议是基于解码或量化和转发(DoQF)的方法。在慢衰落的情况下,两个性能指标是相关的和互补的,即中断概率增益和分集复用权衡(DMT)。首先,我们分析了当信噪比趋于无穷大时,与所提出的协议相关联的中断概率P_o的行为。在这种情况下,我们证明了SNR^2 P_o收敛于一个常数。我们指的是这个常数的中断增益,我们推导出其封闭形式的表达为一般类的无线信道,包括瑞利和赖斯信道作为特殊情况。我们还证明了DoQF协议具有最好的可实现的中断增益在宽类的半双工静态中继协议。还提供了一种用于最小化关于源和中继之间的功率分布以及关于时隙的持续时间的中断增益的方法。接下来,我们专注于瑞利分布衰落信道推导出DMT与建议的DoQF协议。我们的结果表明,对于复用增益r < 0.25,DoQF的DMT达到2 × 1 MISO上限。

英文摘要:

In this work, a new static relaying protocol is introduced for half duplex single-relay networks, and its performance is studied in the context of communications over slow fading wireless channels. The proposed protocol is based on a Decode or Quantize and Forward (DoQF) approach. In slow fading scenarios, two performance metrics are relevant and complementary, namely the outage probability gain and the Diversity-Multiplexing Tradeoff (DMT). First, we analyze the behavior of the outage probability P_o associated with the proposed protocol as the SNR tends to infinity. In this case, we prove that SNR^2 P_o converges to a constant. We refer to this constant as the outage gain and we derive its closed-form expression for a general class of wireless channels that includes the Rayleigh and the Rice channels as particular cases. We furthermore prove that the DoQF protocol has the best achievable outage gain in the wide class of half-duplex static relaying protocols. A method for minimizing the outage gain with respect to the power distribution between the source and the relay, and with respect to the durations of the slots is also provided. Next, we focus on Rayleigh distributed fading channels to derive the DMT associated with the proposed DoQF protocol. Our results show that the DMT of DoQF achieves the 2 by 1 MISO upper-bound for multiplexing gains r < 0.25.

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