多小区OFDMA系统基于改进PSA的资源分配算法

针对载波、功率资源分配问题，考虑本小区对其它小区的干扰情况，提出了一种应用于多 小区正交频分多址复用（OFDMA）系统中的改进罚函数模拟退火(PSA)算法。该问题模型是在 传输速率和性能 一定的条件下，最小化传输功率。该算法是一种随机寻优算法，是一种能将局部搜索扩展为 全局搜索的启发式算法。仿真结果表明，改进算法简化了问题模型，可以在不影响系统性能 的情况下减少运算时间。基于模拟退火算法的离散功率的取值具有随机性，但是整体规律性 仍很明显，且能够获得较高的单位功率吞吐量。

An Improved Penalty-SA Based Resouce Allocation Algorithm for OFDMA Cellular Systems

In consideration of the interference from other cells,an improved penalty simula ted an nealing(PSA) algorithm used in multi-cell OFDMA systems is proposed for carrier and power allocation. The question model is to minimize transmitted power subject t o transmitted rate and performance. This stochastic optimizing algorithm is an h euristic algorithm which expands local search into global search. Experimental r esults show that the improved algorithm can decrease the complexity of the mode l and operation time without affecting system performance. Though the value of d iscrete power based on simulated annealing algorithm is random, the whole regula rity is ob vious with high throughput per unit power.