Outage Probability of Multiuser Relay Networks in Nakagami- $m$ Fading Channels
Outage Probability of Multiuser Relay Networks in Nakagami- $m$ Fading Channels
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DOI：
10.1109/tvt.2010.2042828
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发表时间：
2010-02
影响因子：
6.8
通讯作者：
Nan Yang;M. Elkashlan;Jinhong Yuan
中科院分区：
文献类型：
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作者：
Nan Yang;M. Elkashlan;Jinhong Yuan
我们评估下行链路多用户中继网络（MRN）配备了一个单一的放大转发（AaF）中继的性能。对不同Nakagami-m衰落条件下MRN的中断概率进行了全面准确的分析。更具体地说，我们推导出新的封闭形式的表达式中断概率和概率密度函数（PDF）的最高端到端的信号噪声比（SNR）与最强的目的地与单用户和瑞利衰落作为特殊情况。特别是，我们提供了新的结果信道状态信息（CSI）为基础的增益中继和固定增益中继。然后，我们证明了可实现的分集阶数等于第一跳衰落参数或第二跳衰落参数和目的地数目的乘积。此外，我们推导出紧凑的封闭形式的表达式的时刻的最高端到端的SNR，从其他时刻为基础的措施，如平均SNR和衰落量推导。我们的研究结果突出了机会调度提供的性能改善，并揭示了中继位置与不平衡的跳数对整体性能的影响。各种数值例子说明了所提出的分析。
We evaluate the performance of downlink multiuser relay networks (MRNs) equipped with a single amplify-and-forward (AaF) relay. A thorough and exact analysis is conducted to analyze the outage probability of MRNs under dissimilar Nakagami-m fading conditions. More specifically, we derive new closed-form expressions for the outage probability and the probability density function (pdf) of the highest end-to-end signal-to-noise ratio (SNR) associated with the strongest destination with the single user and Rayleigh fading as special cases. In particular, we provide new results for channel-state information (CSI)-based-gain relaying and fixed-gain relaying. We then demonstrate that the achievable diversity order is equal to either the first-hop fading parameter or the product of the second-hop fading parameter and the number of destinations. Furthermore, we derive compact closed-form expressions for the moments of the highest end-to-end SNR, from which other moment-based measures such as the average SNR and the amount of fading are deduced. Our results highlight the performance improvements offered by opportunistic scheduling and reveal the impact of the relay location with unbalanced hops on the overall performance. Various numerical examples illustrate the proposed analysis.