ABSTRACT:

We consider joint scheduling and diversity to enhance the benefits of multiuser diversity in an orthogonal frequency-division multiple access (OFDMA) downlink system. The OFDMA spectrum is assumed to consist of $N_{rm RB}$ resource blocks and the reduced feedback scheme consists of each user feeding back channel quality information (CQI) for only the best-$N_{rm FB}$ resource blocks. Assuming largest normalized CQI scheduling and a general value for $N_{rm FB}$, we develop a unified framework to analyze the sum rate of the system for both the quantized and nonquantized CQI feedback schemes. Based on this framework, we provide closed-form expressions for the sum rate for three different multiantenna transmitter schemes; transmit antenna selection (TAS), orthogonal space time block codes (OSTBC) and cyclic delay diversity (CDD). Furthermore, we approximate the sum rate expression and determine the feedback ratio $left(N_{rm FB}over {N_{rm RB}}right)$ required to achieve a sum rate comparable to the sum rate obtained by a full feedback scheme.


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