Massive MIMO two-way relay networks with channel imperfections
Massive MIMO two-way relay networks with channel imperfections
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DOI：
10.1109/icc.2016.7511517
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发表时间：
2016-05
期刊：
影响因子：
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通讯作者：
S. Silva;Gayan Amarasuriya;C. Tellambura;M. Ardakani
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文献类型：
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作者：
S. Silva;Gayan Amarasuriya;C. Tellambura;M. Ardakani
本文研究了同信道干扰 (CCI)、不完善信道状态信息 (CSI) 和导频污染对多对大规模多输入多输出 (MIMO) 双向中继网络 (TWRN) 的影响。我们考虑由单天线用户节点和具有非常大的天线阵列的放大转发（AF）中继节点组成的多小区 TWRN 系统。在上述信道缺陷下，只要中继天线的数量相对于用户节点的数量无限制地增长，就可以以封闭形式导出渐近信号干扰噪声比和渐近和速率表达式。对于完美的CSI情况，用户节点和中继处的发射功率可以与中继处的天线数量成反比地缩小。此外，对于不完美的CSI情况，这些发射功率只能与中继天线数量的平方根成反比地按比例缩小。因此，即使 CSI 不完善，采用支持大规模 MIMO 的中继对于节省发射功率的好处也是显着的。此外，我们的分析表明，虽然CCI的有害影响可以被渐近地完全消除，但即使在无限多个中继天线的限制下，由于导频污染造成的残余干扰也无法减轻。
This paper investigates the impact of co-channel interference (CCI), imperfect channel state information (CSI) and pilot contamination for multi-pair massive multiple-input multiple-output (MIMO) two-way relay networks (TWRNs). We consider a multi-cell TWRN system consisting of single-antenna user nodes and amplify-and-forward (AF) relay nodes having very large antenna arrays. Under the aforementioned channel imperfections, the asymptotic signal-to-interference-noise ratio and asymptotic sum rate expressions are derived in closed-form whenever the number of relay antennas grows unbounded with respect to the number of user nodes. For perfect CSI case, the transmit power at the user nodes and the relay can be scaled down inversely proportional to the number of antennas at the relay. Moreover, for the imperfect CSI case, these transmit powers can only be scaled down inversely proportional to the square-root of the relay antenna count. Thus, even with imperfect CSI, the benefits of employing a massive MIMO-enabled relay on transmit power savings are significant. Moreover, our analysis shows that although the detrimental effect of CCI can be asymptotically negated completely, the residual interference due to pilot contamination cannot be mitigated even in the limit of infinitely many relay antennas.