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A Very-Low Pilot Scheme for mmWave Hybrid Massive MIMO-OFDM Systems
IEEE Wireless Communications Letters ( IF 6.3 ) Pub Date : 2021-06-24 , DOI: 10.1109/lwc.2021.3092073
Fengxia Han , Xiaodong Wang , Hao Deng

To reduce the large training overhead required by a millimeter-wave (mmWave) massive MIMO system, this letter proposes a pilot placement scheme and the corresponding receiver technique for multi-user uplink channel estimation and data detection over frequency-selective fading channels when OFDM is employed. Specifically, a small group of subcarriers transmit a small segment of pilots followed by data payloads; and all other subcarriers transmit data payloads only. To recover all channels and payload data, the basic idea is that for pilot subcarriers, a semi-blind method is employed for channel estimation and data detection based on low-rank matrix completion; while for the non-pilot subcarriers, the sparsity of mmWave channels in the delay-domain is exploited, based on which the channel estimation can be solved using the compressed-sensing (CS) technique. Simulation results show that significant performance gains can be achieved by our proposed scheme with very low pilot overhead.

中文翻译:

毫米波混合大规模 MIMO-OFDM 系统的超低导频方案

为了减少毫米波 (mmWave) 大规模 MIMO 系统所需的大量训练开销,本文提出了一种导频放置方案和相应的接收器技术,用于在 OFDM 时频率选择性衰落信道上的多用户上行链路信道估计和数据检测。受雇。具体来说,一小组子载波传输一小段导频,然后是数据有效载荷;并且所有其他子载波仅传输数据有效载荷。恢复所有信道和有效载荷数据的基本思想是,对于导频子载波,采用基于低秩矩阵补全的半盲方法进行信道估计和数据检测;而对于非导频子载波,则利用了延迟域中毫米波信道的稀疏性,在此基础上,可以使用压缩感知 (CS) 技术解决信道估计问题。仿真结果表明,我们提出的方案可以以非常低的导频开销实现显着的性能提升。
更新日期:2021-06-24
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