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arXiv 1209.3702cs.ITmath.IT
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多输入多输出双向继电保护的空分方法

Multiple-Input Multiple-Output Two-Way Relaying: A Space-Division Approach

Xiaojun Yuan, Tao Yang, Iain B. Collings

摘要:

针对多输入多输出(MIMO)双向中继信道(TWRC),提出了一种新的基于空分复用的网络编码方案,其中两个多天线用户通过一个多天线中继交换信息.在所提出的方案中,在中继的整个信号空间被分成两个子空间。在一个子空间中,两个用户的空间流具有几乎正交的方向,并且在中继处被完全解码。在另一个子空间中,两个用户的信号方向近似平行,并且遵循物理层网络编码(PNC)的原理,在中继处计算空间流的线性函数。基于恢复的消息和消息函数,中继器生成网络编码的消息并将其转发到两个用户。我们表明,在高信噪比(SNR),所提出的方案实现的MIMO TWRC的渐近和速率容量在1/2log(5/4)= 0.161位每用户天线的任何天线配置和信道实现。我们进行大系统分析,以获得平均和速率的建议计划在瑞利衰落MIMO TWRCs。我们表明,平均渐近和速率差距的容量上限是最多0.053位每中继天线。结果表明,该计划显着优于现有的计划。

英文摘要:

We propose a novel space-division based network-coding scheme for multiple-input multiple-output (MIMO) two-way relay channels (TWRCs), in which two multi-antenna users exchange information via a multi-antenna relay. In the proposed scheme, the overall signal space at the relay is divided into two subspaces. In one subspace, the spatial streams of the two users have nearly orthogonal directions, and are completely decoded at the relay. In the other subspace, the signal directions of the two users are nearly parallel, and linear functions of the spatial streams are computed at the relay, following the principle of physical-layer network coding (PNC). Based on the recovered messages and message-functions, the relay generates and forwards network-coded messages to the two users. We show that, at high signal-to-noise ratio (SNR), the proposed scheme achieves the asymptotic sum rate capacity of MIMO TWRCs within 1/2log(5/4) = 0.161 bits per user-antenna for any antenna configuration and channel realization. We perform large-system analysis to derive the average sum-rate of the proposed scheme over Rayleigh-fading MIMO TWRCs. We show that the average asymptotic sum rate gap to the capacity upper bound is at most 0.053 bits per relay-antenna. It is demonstrated that the proposed scheme significantly outperforms the existing schemes.

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