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首页> 外文期刊>Wireless personal communications: An Internaional Journal >Limited Feedback MU-MIMO in LTE-A System: Concepts, Performance, and Future Works
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Limited Feedback MU-MIMO in LTE-A System: Concepts, Performance, and Future Works

机译：LTE-A系统中的有限反馈MU-MIMO：概念，性能和未来工作

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摘要

In wireless communications, interference is known as a major restricting factor in achieving system capacity. Therefore, in the Long-Term evolution (LTE) system, a transmitter and a receiver collaborate together to tackle the interference. To do so, in the frequency division duplex system, information of downlink channel must be shared among the transceivers via a limited feedback technique. In this regard, this paper discusses the downlink transmission of multi-user multiple-input multiple-output with limited feedback in the LTE-Advanced system. Extensive studies are conducted on all steps of downlink transmissions and receptions which include techniques such as receive antenna combining, channel state information (CSI) acquisition, CSI quantization, precoding, and user scheduling. By utilizing a LTE-A standard compliant simulator, the link-level performance of the system is evaluated under different receive antenna combiners and quantization codebooks. Moreover, the main system constraints such as channel delay and imperfect CSI are applied to the system which results show that the system performance severely degrades under imperfections, especially when the number of transmit antennas increases. The results mainly reveal that to achieve the capacity of LTE-A, with the presence of interference, delay, and limited feedback, more sophisticated methods are required. Hence, this study precisely addresses the future works on CSI quantization, precoding, and user scheduling.
机译：在无线通信中，干扰是实现系统容量的主要限制因素。因此，在长期演进（LTE）系统中，发射机和接收机共同协作以解决干扰。为此，在频分双工系统中，必须通过有限的反馈技术在收发器之间共享下行链路信道的信息。对此，本文讨论了LTE-Advanced系统中反馈受限的多用户多输入多输出的下行传输。对下行链路传输和接收的所有步骤进行了广泛的研究，包括接收天线组合，信道状态信息（CSI）采集，CSI量化，预编码和用户调度等技术。通过使用符合LTE-A标准的模拟器，可以在不同的接收天线组合器和量化代码本下评估系统的链路级性能。此外，将主要的系统约束（例如信道延迟和不完美的CSI）应用于系统，结果表明，在不完美的情况下，尤其是当发射天线的数量增加时，系统性能会严重降低。结果主要表明，要实现LTE-A的容量，存在干扰，延迟和有限的反馈，就需要更复杂的方法。因此，本研究恰好解决了CSI量化，预编码和用户调度方面的未来工作。

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