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首页> 外文期刊>IEEE Transactions on Communications >The Multicell Multiuser MIMO Uplink with Very Large Antenna Arrays and a Finite-Dimensional Channel
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The Multicell Multiuser MIMO Uplink with Very Large Antenna Arrays and a Finite-Dimensional Channel

机译：具有超大天线阵列和有限维度信道的多小区多用户MIMO上行链路

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摘要

We consider multicell multiuser MIMO systems with a very large number of antennas at the base station (BS). We assume that the channel is estimated by using uplink training. We further consider a physical channel model where the angular domain is separated into a finite number of distinct directions. We analyze the so-called pilot contamination effect discovered in previous work, and show that this effect persists under the finite-dimensional channel model that we consider. In particular, we consider a uniform array at the BS. For this scenario, we show that when the number of BS antennas goes to infinity, the system performance under a finite-dimensional channel model with P angular bins is the same as the performance under an uncorrelated channel model with P antennas. We further derive a lower bound on the achievable rate of uplink data transmission with a linear detector at the BS. We then specialize this lower bound to the cases of maximum-ratio combining (MRC) and zero-forcing (ZF) receivers, for a finite and an infinite number of BS antennas. Numerical results corroborate our analysis and show a comparison between the performances of MRC and ZF in terms of sum-rate.
机译：我们考虑在基站（BS）上具有大量天线的多小区多用户MIMO系统。我们假设通过使用上行链路训练来估计信道。我们进一步考虑一个物理信道模型，其中角域被分成有限数量的不同方向。我们分析了先前工作中发现的所谓的飞行员污染效应，并表明该效应在我们考虑的有限维通道模型下仍然存在。特别地，我们考虑在BS处的统一阵列。对于这种情况，我们表明，当BS天线的数量达到无穷大时，带有P个角箱的有限维信道模型下的系统性能与带有P个天线的不相关信道模型下的系统性能相同。我们进一步在BS上使用线性检测器得出上行链路数据传输可达到速率的下限。然后，我们针对有限数量和无限数量的BS天线，将此下限专门用于最大比率组合（MRC）和迫零（ZF）接收机的情况。数值结果证实了我们的分析，并显示了MRC和ZF在总和率方面的性能比较。

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