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A simple approach for the suppression of Rician interference in a relay backhaul using limited feedback

机译：一种使用有限反馈抑制中继回程中的Rician干扰的简单方法

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摘要

The benefits of Decode and Forward (DF) relaying span from deployment flexibility to coverage extension and improved capacity distribution in the network. Accordingly, relaying has become an integral part of the modern radio access network standards. Besides the evident benefits of DF relaying, the fact is that it uses part of the valuable radio access resources for the communication between network elements. Thus, the amount of radio resources allocated to the Relay Link (RL) between serving Donor Base Station (DBS) and the Relay Node (RN) should be minimised. This easily makes the RL a bottleneck in conventional two-hop infrastructure relaying. Furthermore, current mobile systems apply universal frequency reuse in macrocell deployments where macrocell BS’s serve RN’s as well. As a result, RL’s may suffer from severe interference.We propose a practical limited feedback approach that can be used to simultaneously improve the signal strength and to suppress the interference in the RL. To that end, we deduce analytical formulae for the distribution of the Signal to Interference and Noise Ratio (SINR) in the RL by assuming Rice and Rayleigh fading combinations in desired and interfering links. Furthermore, we compute two-hop end-to-end (e2e) outage probabilities for different interference and limited feedback scenarios. Results show that especially in Rice fading environment, large performance gains can be obtained with only few bits feedback in case where RL has scarce radio resources and suffers from dominant interferer. This makes the proposed method very feasible for the infrastructure relaying where RN’s can be placed either in the rooftop level or other locations that provide a line of sight towards macro BS’s.
机译：解码和转发（DF）中继的好处涵盖了部署的灵活性，覆盖范围的扩展以及网络容量的改善。因此，中继已经成为现代无线电接入网络标准的组成部分。除了DF中继的明显好处外，事实是它使用部分有价值的无线电访问资源来进行网元之间的通信。因此，应最小化分配给服务施主基站（DBS）与中继节点（RN）之间的中继链路（RL）的无线电资源量。这很容易使RL成为常规两跳基础结构中继的瓶颈。此外，当前的移动系统将通用频率复用应用于宏小区部署，其中宏小区BS也为RN服务。因此，RL可能会受到严重的干扰。我们提出了一种实用的有限反馈方法，该方法可用于同时提高信号强度并抑制RL中的干扰。为此，我们通过假设期望和干扰链路中的Rice和Rayleigh衰落组合，推导了RL中信噪比（SINR）分布的解析公式。此外，我们针对不同的干扰和有限的反馈方案计算了两跳端到端（e2e）中断概率。结果表明，特别是在莱斯衰落环境中，如果RL的无线电资源稀少并且受到主要干扰源的干扰，则仅需很少的比特反馈就可以获得很大的性能提升。这使得所提出的方法对于基础设施中继非常可行，在该基础设施中继中，可以将RN放置在屋顶级别或其他位置，从而为宏BS提供视线。

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