Abstract
AbstractThis paper investigates the problem of source encoding in multiuser multiple‐input multiple‐output (MIMO)–orthogonal frequency division multiplexing (OFDMA) downlink with a limited feedback channel. The proposed encoding scheme, including beamforming, subcarrier distribution and rate loading, applies a pre‐designed codebook of beamforming vectors, which is stored at both the transmitter and the receiver. The receiver selects the beamforming vector and user for each subcarrier aiming at SINR maximization and conveys the index of the chosen vector and equivalent gain to the transmitter. At the transmitter, the rate is loaded to each subcarrier using the ‘greedy’ algorithm. The methods of codebook construction and rate loading are discussed in detail. Simulation results show that the scheme decreases the amount of feedback data while maintaining quite a large downlink capacity and the capacity approaches that of perfect CSI with an increase in codebook elements. Copyright © 2008 John Wiley & Sons, Ltd.
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