混沌模拟退火法在下行链路功控中的应用  

Application of Chaotic Simulated Annealing Algorithm in Downlink Power Control

作　　者：何迪[1] 何晨[1] 蒋铃鸽[1] 诸鸿文[1] 胡光锐[1] 

机构地区：[1]上海交通大学电子工程系,上海200030

出　　处：《上海交通大学学报》2002年第5期624-627,共4页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金重点项目 (6973 5 10 1)

摘　　要：以混沌模拟退火法为基础 ,提出一种基于分形结构的全局最优化算法 ,并将其应用于解决同步码分多址 ( CDMA)移动通信系统的下行链路功率控制问题中 ,有效地避免了落入局部极小值的情况 .通过将下行链路功率控制归结为形式简单的组合优化问题 ,并适当分析能量函数的连续性与可导性 ,以及求导过程的特殊性 ,说明了利用混沌模拟退火法解决此问题的可行性 .模拟结果表明 ,该方法比一般的载波干扰比功率控制方法性能更优 。A novel fractal based global optimization algorithm oriented from chaotic simulated annealing was proposed. It can be applied to solve the problem of downlink power control in a synchronous CDMA system, which can avoid the solution of local optimum efficiently. By changing the problem of downlink power control to a combination optimization one with simple form, analyzing the continuity and derivative of energy function, and explaining the particularity of obtaining derivatives, the feasibility of solving the problem using chaotic simulated annealing algorithm was explicated. Compared with conventional power control method utilizing carrier-to-interference ratio, the simulation results show that it can achieve lower bit error ratio and higher channel capacity.

关 键 词：同步码分多址系统 下行功率控制 混沌模拟退火法 优化 

分 类 号：TN914[电子电信—通信与信息系统]