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Downlink Precoding with Mixed Statistical and Imperfect Instantaneous CSI for Massive MIMO Systems. (arXiv:1711.10797v2 [cs.IT] UPDATED)
来源于:arXiv
In this paper, the feasibility of a new downlink transmission mode in massive
multi-input multi-output (MIMO) systems is investigated with two types of
users, i.e., the users with only statistical channel state information (CSI)
and the users with imperfect instantaneous CSI. The problem of downlink
precoding design with mixed utilization of statistical and imperfect
instantaneous CSI is addressed. We first theoretically analyze the impact of
the mutual interference between the two types of users on their achievable
rate. Then, considering the mutual interference suppression, we propose an
extended zero-forcing (eZF) and an extended maximum ratio transmission (eMRT)
precoding methods to minimize the total transmit power of base station and to
maximize the received signal power of users, respectively. Thanks to the
exploitation of statistical CSI, pilot-based channel estimation is avoided
enabling more active users, higher system sum rate and shorter transmission
delay. Finally, simulat 查看全文>>