This paper considers uplink amplifyandforward orthogonal frequency division multiple access （OFDMA） relay networks under heterogeneous traffics scenario where users have different QoS requirements. Under the users and relay independent transmit power constraints, a subcarrier pairing assignment and power allocation algorithm is proposed to maximize the sum rate of elastic users， while satisfying the transmit rate requirements of nonelastic users. In order to reduce the computational complexity, the original mixed binary integer programming problem is decomposed into three subproblems, i.e., subcarrier pairing assignment, joint power allocation at the nonelastic users and the relay, and joint power allocation at the elastic users and the relay. As a result, the computational complexity is reduced from the exponential level to linear polynomial level. Simulation results show that the proposed resource allocation algorithm can satisfy the rate requirements of the nonelastic users, and the achieved sum rate for elastic users is significantly higher than that of the algorithms which are designed with the equal power allocation criterion or without considering subcarrier pairing process.
Key words
orthogonal frequency division multiple access （OFDMA） /
amplifyandforward /
relay network /
uplink /
heterogeneous traffics /
resource allocation
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