一种OFDMA实时子载波分配算法及仿真

A Real-Time OFDMA Sub-Carrier Allocation Algorithm and Its Simulation

正交频分多址(OFDMA)是以OFDM调制为基础的新一代无线接入技术,在这种方式中,多址是通过给每个用户分配可用子载波总数的一部分来实现的。介绍了一种OFDMA下行链路的实时动态子载波分配算法,算法根据各个子载波对各个用户的瞬时信道增益,在使系统总的发送功率最小的准则下,为各用户分配最优的子载波组。最后用MATLAB语言仿真实现了该算法.仿真结果表明该算法性能要优于传统的静态子信道方案。

Orthogonal frequency division multiple access （OFDMA） is a new wireless access technology based on OFDM, which realizes multiple access by providing each user with a fraction of the available number of subcarriers. This paper introduces a real - time dynamic sub - carrier distribution algorithm for OFDMA downlink transmission. Knowing the channel characteristics of all the users at the base station, the sub - carrier allocation algorithm assigns subcarriers to the users in such a way that the total transmit power is minimized. Finally the algorithm is simulated using MATLAB and the result indicates that the performance of the proposed algorithm is better than conventional static subchannel scheme.