平均速率受限条件下OFDM系统联合自适应分配策略

Margin adaptive allocation algorithm with average data rate constraint in multiuser OFDM systems

提出一种满足不同用户速率要求的OFDM系统的联合子载波、比特和功率分配算法,以达到进一步减小发射功率的目的。首先在用户平均速率受限的条件下进行子载波分配,然后对分给每个用户的子载波进行速率注水,进行比特和功率分配,使系统在满足用户传输速率要求的同时传输功率最小。仿真结果表明,该算法功率分配部分具有较低的复杂度,相同性能要求下所需最小传输功率比其他算法小。

A novel margin adaptive resource allocation algorithm was proposed for multiuser OFDM systems to reduce the total transmit power. In the algorithm the following two steps were considered. In the first step, subcarriers were assigned with the average data rate constraint, and in the second, power and bits were distributed to the subcarriers which was assigned in the first step based on the waterfilling theory. Computer simulations show that the proposed algorithm has low calculating complex and the total transmit power is smaller than the existing algorithm.