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首页> 外文期刊>Microwaves, Antennas & Propagation, IET >Hybrid multiple-input multiple-output scheme combining precoded and non-precoded transmission
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Hybrid multiple-input multiple-output scheme combining precoded and non-precoded transmission

机译：结合了预编码和非预编码传输的混合多输入多输出方案

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摘要

A hybrid multiple-input multiple-output (MIMO) scheme capable of switching between non-precoded transmission and covariance-based precoded transmission is proposed. Such a hybrid scheme is desired as the covariance-based precoding gain is insignificant when transmission takes place in lowly correlated channels. Such a minor performance gain is not sufficient to justify the high-complexity precoding employed at the transmitter. The proposed scheme does not require a feedback channel or pilot symbols as knowledge of the downlink channel covariance and correlation is made available to the downlink transmitter through direct estimation from the uplink received signal energy. Performance studies carried out in both time division duplex and frequency division duplex systems reveal that the performance of the proposed scheme is on par with that of an existing MIMO precoding scheme with the added advantage of lower complexity and improved system efficiency.
机译：提出了一种能够在非预编码传输和基于协方差的预编码传输之间切换的混合多输入多输出（MIMO）方案。期望这种混合方案，因为当在低相关信道中进行传输时，基于协方差的预编码增益不重要。这样的次要性能增益不足以证明在发射机处采用的高复杂度预编码是合理的。所提出的方案不需要反馈信道或导频符号，因为通过根据上行链路接收信号能量的直接估计，下行链路发射机的协方差和相关性可用于下行链路发射机。在时分双工和频分双工系统中进行的性能研究表明，该方案的性能与现有MIMO预编码方案的性能相当，并具有更低的复杂度和更高的系统效率。

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