OFDMA系统中保证QoS的资源分配研究

Research on providing QoS resource allocation algorithms of OFDMA systems

针对OFDMA系统的下行链路,提出了一种面向不同业务的低复杂度资源分配算法。方案基于上行链路分配的思想,先进行用户功率和子载波数的确定;然后引入基于用户信道状态、速率要求和延时约束的优先级函数。在子载波的分配中,根据优先级函数分配子载波以满足各类业务的具体要求。仿真结果表明,该算法能够充分利用多用户分集增益,在相同的通信服务质量条件下,算法提高了系统性能,降低了计算复杂度,具有现实意义。

This paper proposed a low complexity resource management scheme for the downlink OFDMA systems. Based on the methodology of uplink design, first allocated the power constraints and sub-carriers. A priority function which was based on user＇ s channel state and introduced data transmission rate constraint and delay constraint to satisfy different service for different users. Numerical results and analysis demonstrate that the proposed scheme can exploit muhi-user diversity, the new algorithm has markedly improving of the system capacity and great complexity reduction under the same QoS condition. It has bright prospect in applications algorithm.