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Limited Feedback MU-MIMO-OFDM Systems

机译:有限反馈MU-MIMO-OFDM系统

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Practical precoding schemes inevitably have to deal with the problem of imperfect, rather than ideal, channel state information at the transmitter (CSIT). This impairment permeates all the processing steps conducted at the transmitter side and it also conditions the receiver design. This paper tackles the problem of designing multiuser MIMO-OFDM (MU-MIMO-OFDM) schemes when only limited feedback is available, with a particular emphasis on the case of IEEE 802.11ac. After deriving a statistical model for the interference caused by limited-feedback valid for various linear precoding schemes, it is shown how this information can be incorporated to the processes of user selection and link adaptation in the context of IEEE 802.11ac. Extensive simulation results are presented assessing the performance of the various limited-feedback designs and comparing them with their perfect CSIT counterparts.
机译:实际的预编码方案不可避免地必须处理发射机(CSIT)上的信道状态信息不完美而不是理想的问题。这种损害贯穿了在发送器侧执行的所有处理步骤,并且还制约了接收器的设计。本文解决了在只有有限反馈的情况下设计多用户MIMO-OFDM(MU-MIMO-OFDM)方案的问题,特别着重于IEEE 802.11ac的情况。在推导了对各种线性预编码方案有效的有限反馈引起的干扰的统计模型之后,说明了如何在IEEE 802.11ac的上下文中将此信息合并到用户选择和链路自适应过程中。给出了广泛的仿真结果,以评估各种有限反馈设计的性能,并将其与完美的CSIT同类产品进行比较。

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