In this paper we analyze the sum rate of zero-forcing (ZF) precoding in MISO broadcast channels with limited feedback, transmit correlation and path loss. Our analysis assumes that the number of transmit antennas M and the number of users K are large, while their ratio remains bounded. By applying recent results from random matrix theory we derive a deterministic equivalent of the signal-to-interference plus noise ratio (SINR) and compute the sum rate maximizing number of users as well as the limiting sum rate for high signal-to-noise ratios (SNR), as a function of the channel errors and the channel correlation pattern. Simulations show that theoretical and numerical results match well, even for small system dimensions.
Large system analysis of zero-forcing precoding in MISO broadcast channels with limited feedback
SPAWC 2010, 11th IEEE International Workshop on Signal Processing Advances in Wireless Communications, 20-23 June, 2010, Marrakech, Morocco
Systèmes de Communication
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