多用户OFDM系统基于用户调度的子载波和比特分配算法

Subcarrier and bit allocation algorithm based on user scheduling for multiuser OFDM system

在多用户正交频分复用(OFDM)系统中,通过运用调度技术对动态资源分配的贪婪算法进行改进,增加了系统接入用户的数量.该算法中,基站的调度器根据用户的服务要求(QoS)确定用户分配资源的优先权,无线资源分配模块(RRA)根据用户调度信息,利用贪婪算法动态分配子载波和比特给用户.仿真结果表明:与原始贪婪算法相比,改进算法能满足更多用户的服务要求.

In this paper, greedy algorithm used in dynamic resource allocation is improved by importing scheduling technique for muhiuser OFDM system. The number of accessed user is increased in system. In improved algorithm, the scheduler on base station will confirm user＇s priority according to user＇s quality of service （QoS）. Radio Resource Allocation （RRA） dynamically allocates subcarrier and bit to user by applying greedy algorithm. Simulation results show that the improved algorithm can provide satisfied service to more users compared with initial greedy algorithm.