OFDMA下行链路的延迟加权动态子载波分配算法

研究了正交频分多址（OFDMA）下行链路的资源分配算法，提出了延迟加权动态子载波分配算法（DWDSA）. 算法采用内环和外环的控制结构，内环控制的主要功能是在给定某一确定的功率分配方案时，对子载波进行有效分配；外环控制采用延迟调节资源分配算法的参数. 通过仿真表明，DWDSA算法在排队延迟和缓冲区占用方面有很好的性能改善；并且算法兼顾了排队延迟和信道条件，在满足服务质量的同时提高了资源的利用率.

Delay Weighted Dynamic Subcarrier Allocation Algorithm for OFDMA Downlink

The dynamic subcarrier allocation algorithm was studied.A novel algorithm for subcarrier allocation called delay weighted dynamic subcarrier assignment(DWDSA) was proposed.DWDSA was composed of inner and outer loop control structure.The function of inner loop was to allocate the subcarrier with the given power allocation scheme.And that of out loop was to adjust the delay weighted parameters.The performance of the queuing delay and buffer occupancy are improved according the simulation results.Moreover,in this algorithm the queuing delay and channel condition were consi-(dered) to improve the resources utility and to satisfy the requirement of quality of service(QoS).