OFDMA中继网络上行链路资源分配算法设计

Resource allocation algorithm for uplink OFDMA relay networks

针对放大-转发OFDMA中继网络上行链路,考虑具有不同QoS要求的异构业务场景,在用户与中继独立功率约束条件下,提出一种子载波对匹配分配与功率分配算法,以实现在满足非弹性用户速率需求前提下,最大化弹性用户和速率的目标.为降低算法计算复杂度,将原混合二进制整数规划问题分解为子载波对匹配分配,非弹性用户与中继、弹性用户与中继联合功率分配三个子问题,从而实现计算复杂度从指数级别到线性的下降.仿真结果显示,所提方案能够满足非弹性用户的速率需求,且弹性用户的和速率容量明显高于等功率分配原则和未进行子载波匹配下的资源分配算法.

This paper considers uplink amplify-and-forward or- thogonal frequency division multiple access （OFDMA） relay net- works under heterogeneous traffics scenario where users have dif- ferent 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 non-elastic users. In order to reduce the computational complexi- ty, the original mixed binary integer programming problem is de- composed into three subproblems, i. e. , subearrier pairing as- signment, joint power allocation at the non-elastic users and the relay, and joint power allocation at the elastic users and the re- lay. As a result, the computational complexity is reduced fromthe exponential level to linear polynomial level. Simulation re- sults show that the proposed resource allocation algorithm can satisfy the rate requirements of the non-elastic users, and the a- chieved sum rate for elastic users is significantly higher than that of the algorithms which are designed with the equal power alloca- tion criterion or without considering subcarrier pairing process.