一种改进的OFDM自适应功率分配算法

Improved Power Allocation Algorithm for OFDM Systems

注水分配算法是实现正交频分复用(OFDM)系统中功率和误比特率受限条件下总比特速率最大化的最优算法,在估计目标值时,常使用基于拉格朗日乘子法的二分算法。针对迭代过程中估计值偏离目标值时收敛较慢的情况,提出混合二分算法。仿真结果证明,该算法比二分算法具有更快的收敛速度。

Water-filling distribution algorithm is the optimal algorithm for OFDM systems to maximize the overall bit rate under overall power and bit error rate constraints. Dichotomy combined Lagrange-multiplier method is used to estimate the tar aet value. The algorithm has slow convergence when the estimated value is far from the target. This paper presents a mixed dichotomy to solve the problem. Simulation resuhs show that the proposed algorithm has faster convergence than dichotomy.