基于合作中继的OFDM蜂窝网络的QoS感知子载波分配算法*

针对基于中继的OFDM蜂窝网络，提出了一种基于合作中继的QoS感知子载波分配算法，即C-QSA(cooperative QoS-ware subcarrier allocation)算法。C-QSA算法利用基站与中继节点之间的合作传输机制来保证QoS业务的速率要求，允许中继节点进行比特重分配，充分利用无线系统的时变及多用户分集特性，提高无线资源的利用效率。C-QSA算法将子载波分配问题抽象为非线性整数规划，以最大化系统效用为目标，同时满足QoS业务的速率要求。仿真结果表明，C-QSA算法在用户效用及吞吐量等性能方面都有明显优势，系统实际效用接近理论最优值。

QoS-aware subcarrier allocation agorithm for cooperative relay-based OFDM cellular networks

This paper proposed a QoS-aware subcarrier allocation algorithm for cooperative relay-based OFDM cellular network with both QoS and BE services, referred to as C-QSA. In C-QSA, employed cooperative transmission between the base-station (BS) and the relay-station (RS) to fulfill the requirements of QoS users. Moreover, allowed each RS to perform bit reallocation to fully exploit time-varying channel state and multiuser diversity, so as to achieve efficient radio resource utilization. C-QSA formulated the design of subcarrier allocation as a non-linear integer optimization problem, which aimed at maximizing the system sum utility while satisfying the data rate requirements of QoS users. Numerical results demonstrate that C-QSA is able to significantly improve the network performance in terms of user utility and system throughput, and the system utility achieved by C-QSA is very close to the optimal value.