摘要
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.
出处
《计算机工程》
CAS
CSCD
北大核心
2008年第1期37-39,共3页
Computer Engineering
关键词
正交频分复用
注水分配
自适应调制
功率分配
OFDM
water-filling distribution
adaptive modulation
power allocation