多用户OFDM系统中的联合子载波和功率分配算法

Joint subcarrier and power allocation algorithm for multiuser OFDM systems and its performance

正交频分复用系统中的动态资源分配对提高频谱效率起着至关重要的作用,故提出了一种多用户正交频分复用系统中的新型子载波和功率分配算法,根据用户速率请求进行子载波分配,并结合改进的多用户注水算法,在提高系统频谱效率的同时,满足用户的误比特率要求.研究结果表明,该算法在保证误比特率和用户间公平性的前提下提高频谱效率.

Adaptive resource allocation is crucial to improving the spectrum efficiency for OFDM systems. A novel resource allocation algorithm is developed here to assign subcarriers and power to each user. According to the user＇s rate requirement, the subcarriers are allocated with proportional fairness. The improved multiuser water- filling algorithm, with the consideration of the bit error rate, is used to determine the power on each subcarrier. The results show that the proposed algorithm can obtain a high spectrum efficiency and that the bit error rate and the fairness among the users are considered simultaneously.