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As a promising technology to significantly increase the spectral efficiency of wireless systems, Multiple-Input and Multiple-Output (MIMO) techniques have drawn much attention over the past two decades. The work of, and the references therein have studied the information-theoretic aspects of MIMO systems and showed the capacity region for BroadCast (BC) and Multiple-ACcess (MAC) channels. Orthogonal Frequency Division Multiple Access (OFDMA) is another technique which has attracted substantial research interest. Almost all newly developed wireless systems, such as 3GPP LTE, LTE-Advanced and IEEE 802.16m, base their air interfaces on MIMO-OFDMA. MIMO-OFDMA systems can be deployed in two flavors: single-user and multi-user. For communications without feedback or with limited feedback, it is reasonable to adopt a single-user MIMO strategy.
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