Uplink/downlink duality in massive MIMO systems with hardware impairments
Uplink/downlink duality in massive MIMO systems with hardware impairments
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DOI：
10.1109/icc.2016.7510762
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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. Zarei;W. Gerstacker;R. Schober
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文献类型：
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作者：
S. Zarei;W. Gerstacker;R. Schober
在本文中，我们提供了一个新的框架，在单小区的大规模多输入多输出（MIMO）系统遭受残留的硬件损伤（HWI）在基站和用户终端的上行链路/下行链路的对偶。利用所提出的对偶，复杂的下行链路优化问题可以转化为等价的对偶上行链路问题，这是更容易解决。作为一个例子，我们应用所提出的上行链路/下行链路的二元性，以获得HWI意识的最小均方误差（HWIA-MMSE）预编码器，它最小化的总和下的功率约束在单小区的大规模MIMO系统与残留的HWI的总和均方误差。因此，我们使用随机矩阵理论的结果推导出大量天线的下行链路功率分配的渐近表达式，这只取决于信道统计，而不是对个人的信道实现。还提供了大量的BS天线的建议HWIA-MMSE预编码器的渐近可实现的和速率的分析结果。我们的仿真和分析结果表明，建议的HWIA-MMSE预编码器实现了较高的和速率比常规的正则化迫零预编码器的适度大量的基站天线。
In this paper, we provide a new framework for the uplink/downlink duality in single-cell massive multiple-input multiple-output (MIMO) systems suffering from residual hardware impairments (HWIs) at the base station and the user terminals. Using the proposed duality, complex downlink optimization problems can be converted to equivalent dual uplink problems, which are easier to solve. As an example, we apply the proposed uplink/downlink duality to derive an HWI aware minimum mean square error (HWIA-MMSE) precoder, which minimizes the sum mean square error under a sum power constraint in a single-cell massive MIMO system with residual HWIs. Thereby, we use results from random matrix theory to derive an asymptotic expression for the downlink power allocation for large numbers of antennas, which only depends on the channel statistics and not on the individual channel realizations. Analytical results for the asymptotic achievable sum rate of the proposed HWIA-MMSE precoder for a large number of BS antennas are also provided. Our simulation and analytical results show that the proposed HWIA-MMSE precoder achieves a higher sum rate than the conventional regularized zero-forcing precoder for moderately large numbers of base station antennas.