摘要
针对高峰均比信号是正交频分复用(OFDM)技术实用化的主要障碍问题,提出了一种基于改进模拟退火优化的部分传输序列(IMSA-PTS)算法.该算法采用改进模拟退火优化搜索最优相位因子,避免了相位因子搜索陷入局部极小值,而且在不改变退火过程的条件下,可以得到历经搜索过程中所有状态的最小峰均比信号.同时,通过设定门限值,提高了收敛速度,显著降低了算法的计算复杂度.仿真结果证明,所提算法在保持良好峰均比降低性能的同时,有效地降低了计算的复杂度.
PAPR（peak-to-average power ratio） is the basic barrier to the practical application of OFDM system. To solve this problem, a novel PTS（partial transmit sequence） algorithm based on improved simulated annealing PTS （IMSA-PTS） is proposed, where the improved SA optimization approach is used to search the optimal combination of phase factors so as to avoid the local minimum due to the search for phase factor and acquire the minimum PAPR signal from all the states occurring in exhaustive search with unchanged simulated annealing process. Simultaneously, a threshold value is set to improve the convergence rate so as to reduce the computational complexity significantly. Simulation results showed that the proposed algorithm can provide favorable PAPR reduction with low computational complexity.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第4期522-525,共4页
Journal of Northeastern University(Natural Science)
基金
教育部高等学校博士学科点专项科研基金资助项目(20050145019)
关键词
正交频分复用
峰均比
部分传输序列
模拟退火
相位因子
OFDM （ orthogonal frequency division multiplexing ）
PAPR
PTS
simulated annealing
phase factor
