一种低复杂度OFDMA功率分配算法

A lower complexity algorithm of power allocation on OFDMA

为了使正交频分多址接入系统中用户的数据传输速率的总和达到最大化,提出一种线性的功率分配算法,该算法通过放松对用户之间速率相互成比例的约束,将迭代非线性问题转换成联立线性方程组的问题,从而使求解功率分配的非线性迭代算法得以简化。仿真结果显示,新算法与原迭代算法相比,可免除对信噪比高的子信道的限制,且能提高约2%的系统吞吐量。

In order to maximize the sum of user data rates of the Orthogonal Frequency Division Multiple Access（OFDMA）system, a linear algorithm of power allocation is proposed. This algorithm converts the iterative nonlinear problem into the problem of simultaneous linear equations by the relaxation of strict user rate proportionality constraints. Therefore the nonlinear iterative algorithm to solve the power allocation is simplified. The simulation results show the proposed method increases the throughput of the system by 1.02 times compared to the traditional iterative method.