Pilot Reuse for Massive MIMO Transmission over Spatially Correlated Rayleigh Fading Channels
Pilot Reuse for Massive MIMO Transmission over Spatially Correlated Rayleigh Fading Channels
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DOI：
10.1109/twc.2015.2404839
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发表时间：
2015-06-01
影响因子：
10.4
通讯作者：
Peng, Yan
中科院分区：
文献类型：
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作者：
You, Li;Gao, Xiqi;Peng, Yan
我们提出了单个单元格中的飞行员重复使用（PR），以进行大规模的多源多输入多输出（MIMO）传输，以减少飞行员开销。对于空间相关的瑞利褪色通道，当基站天线数倾向于无穷大时，我们建立了通道空间相关性与通道功率角谱之间的关系。使用此通道模型，我们显示通道估计的均值均值误差（MSE）可以最小化，只要用户终端的通道到达之间的频道重用飞行员的到达间隔是不重叠的，这表明PR比空间相关的大型MIMO的可行性通道角度扩展约束的通道。由于通道估计性能可能由于PR而降低，因此我们还开发了闭合形式的稳健多源上行链路接收器和下行链路预编码器，从而最大程度地减少信号检测的总和，并揭示它们之间的二元性。随后，我们调查了在两个最低MSE相关标准下确定PR模式的试点计划，并提出了仅依赖于通道统计信息的低复杂性飞行员调度算法。仿真结果表明，拟议的PR方案在净光谱效率方面为常规的正交训练方案提供了显着的性能增长。
We propose pilot reuse (PR) in single cell for massive multiuser multiple-input multiple-output (MIMO) transmission to reduce the pilot overhead. For spatially correlated Rayleigh fading channels, we establish a relationship between channel spatial correlations and channel power angle spectrum when the base station antenna number tends to infinity. With this channel model, we show that sum mean square error (MSE) of channel estimation can be minimized provided that channel angle of arrival intervals of the user terminals reusing the pilots are non-overlapping, which shows feasibility of PR over spatially correlated massive MIMO channels with constrained channel angular spreads. Since channel estimation performance might degrade due to PR, we also develop the closed-form robust multiuser uplink receiver and downlink precoder that minimize sum MSE of signal detection, and reveal a duality between them. Subsequently, we investigate pilot scheduling, which determines the PR pattern, under two minimum MSE related criteria, and propose a low complexity pilot scheduling algorithm, which relies on the channel statistics only. Simulation results show that the proposed PR scheme provides significant performance gains over the conventional orthogonal training scheme in terms of net spectral efficiency.