WPDM-CDMA系统中的子载波分配算法研究

A Sub-Carrier Allocation Algorithm in the Multi-Carrier System

针对现有的分组子载波分配算法、间隔子载波分配算法以及自适应分配算法公平性差、误码率高等不足,以多载波通信方案之一WPDM-CDMA为研究系统提出一种新的基于相对比特需求和传输功率函数的子载波分配算法,由于各个用户和基站间经历的信道环境存在差异,要综合考虑各个用户分配的公平性和资源的合理利用等因素,此算法根据用户比特需求,计算出分配过程中优先考虑的用户以及传输功率低的子载波,在5径Rayleigh信道下与分组算法和间隔算法进行仿真对比,仿真结果表明此算法在误码率性能和公平性方面优于其余2种算法.

The current sub-carrier allocation algorithm of grouping, interval sub-carrier allocation algorithm and adaptive sub carrier allocation algorithm are not good enough due to their low fairness and high bit error rate. In order to overcome these shortcomings, a new algorithm based on transmission power and relative bit requirement is proposed in WPDM-CDMA system, which is one of multi-carrier communication schemes. Because of the differences in the physical channel environment between the user and the base station, fairness of allocation and rational use of resources need to be considered. Based on the bit rate requirements of different users, sub-carriers of priority users and low transmission power are calculated. Then simulation is made with grouping and interval in 5-path Rayleigh channels, and the results show that the algorithm proposed in this paper is better than the other two algorithms in bit error rate performance and fairness.