一种新的OFDMA系统功率与比特分配算法

A New Power and Bit Allocation Algorithm for OFDMA System

针对实际正交频分复用多址访问(OFDMA,Orthogonal Frequency Division Multiple Access)系统中整数比特的限制问题,以及用户间公平性要求较为松弛的情况,提出了一种新的整数比特条件下的功率与比特分配算法。该算法首先按公平比例进行功率和比特分配,然后对分配结果取整,并将剩余的功率与比特再进行分配。仿真结果表明:该算法保持用户间的比例公平性的基础上取得与贪婪算法接近的系统容量,公平性优于贪婪算法。

For the limitations of integer bits in real OFDMA systems and comparatively low fairness requirement among between the users,a new power and bit allocation algorithm in integer-bit condition is proposed.This algorithm first allocates the power and bits fairly among users,then truncates allocated bits to integer,and finally reallocates the remaining power and bits.The simulation results indicate that the proposed algorithm could achieve the similar system capacity close to the greedy algorithm,while ensuring the proportional fairness among between the users.