一种降低OFDM系统峰均比的快速算法

OFDM技术具有较高的频谱利用率和良好的抗多径衰落性能,目前已在很多领域得到了应用,但它存在的高峰均比问题对系统的性能产生了一定影响。采用优化的模拟退火PTS算法,通过保存中间最优解,控制降温幅度,设置双阈值和链接补充搜索过程,不仅加快了普通模拟退火算法的收敛速度,而且具备良好的搜索精度。仿真结果表明,所提算法既保持较低的计算复杂度,同时具有良好的峰均功率比性能。

A Fast Algorithm for Reducing PAPR of OFDM System

OFDM technology, with high spectrum efficiency and good anti-multipath fading performance, is widely applied in many fields, and however, its high PAPR has certain impact on the performance of the system. An improved algorithm simulated annealing PTS is proposed, which, by preserving the middle of optimal solution, controlling temperature range, setting the dual-threshold, and adding a search process, speeds up the convergence of simple simulated annealing algorithm while maintains the search accuracy. Simulation results show that the proposed algorithm could have a low computational complexity, while keeps a good performance of PAPR.