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Transceiver design in multiuser MISO systems with imperfect transmit CSI

机译:具有不完美传输CSI的多用户MISO系统中的收发器设计

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Multiple transmit antennas can be employed in a downlink channel to serve multiple users under the assumption of perfect channel state information (CSI) of all users at the base station. In practice, however, the channel knowledge available at the base station is not perfect. For instance, in case of a time division duplex (TDD) system, the transmit CSI is the estimated uplink channel. On the other hand, in a frequency division duplex (FDD) system, feedback from the users is required to obtain transmit CSI. In this case, we assume the transmit CSI consists of a quantized version of the normalized estimated channel vector and the statistics of the channel norm of each user. In this work we consider the transceiver design of the downlink of a multiuser MISO system based on the minimum mean square error (MMSE) criterion with imperfect CSI as discussed above.
机译:在基站处所有用户的完美信道状态信息(CSI)的假设下,可以在下行链路信道中使用多个发射天线来服务多个用户。然而,实际上,基站可用的信道知识并不完善。例如,在时分双工(TDD)系统的情况下,发送CSI是估计的上行链路信道。另一方面,在频分双工(FDD)系统中,需要来自用户的反馈以获得发送CSI。在这种情况下,我们假设发送CSI由归一化估计的信道向量的量化版本和每个用户的信道范数的统计组成。在这项工作中,如上所述,我们基于具有不完善CSI的最小均方误差(MMSE)准则,考虑了多用户MISO系统的下行链路的收发器设计。

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