摘要
针对当前认知无线电动态频谱接入算法实现复杂度高的缺点,提出了在硬件受限制的情况下,基于部分可观察马尔科夫决策过程的动态频谱接入算法。该算法利用多次对外界信道的检测得到对外界环境的估计,然后根据此估计以当前和未来收益总和最大化为目标,实频谱接入,并实现了最优解和贪心法次优解。该算法比随机检测接入算法多获得约25%的带宽,贪心法的次优解在阶段数较少时与最优解性能非常接近。
A POMDP （Partially Observable Markov Decision Process） based DSA （Dynamic Spectrum Access） algorithm is suggested under hardware constrains, after study the faults of two kinds of DSA algorithm： cooperation style and non-cooperation style. The algorithm uses the senses to get the estimate of spectrum environment then use the result to decide access action. Tthe POMDP optimal solution and greedy method are used to solve the model,it can get about 25% more bandwidth opportunities than random sense-access policy; the greedy method solution is a suboptimal one, but it gets similar performance with the optimal solution when the number of horizons is small.
出处
《科学技术与工程》
2009年第12期3288-3291,共4页
Science Technology and Engineering
