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This paper considers a large multi-user time-division duplex (TDD) system, where the base station (BS) acquires channel state information via pilot signaling from the users. In the downlink the BS employs zero-forcing (ZF) and regularized zero-forcing (RZF) precoding. We derive the optimal sum rate maximizing amount of channel training using sum rate approximations from the large system analysis of...
In this paper, a deterministic approximation for the rate region of multiple access channels is provided when both the base station and the users have large numbers of antennas, and when the transmission bandwidth is divided into several independent subbands. An explicit formulation is also given for the transmit covariance matrices, at each frequency, that reach the boundary of the rate region. From...
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