机会式频谱接入问题基于事件的优化方法

研究机会式频谱接入技术中次用户对可利用频谱进行探测和接入策略的优化问题. 通过引入事件的概念, 将含有可数无限状态的原问题转化为包含有限个事件的决策问题. 从性能灵敏度的角度出发, 分析不同策略下平均传输率的差异, 给出了基于事件策略的性能差分公式. 以此为基础, 通过合理的近似, 设计了基于事件的策略迭代算法. 仿真示例验证了所提出算法的有效性和近似处理的合理性.

Event-Based Optimization Approach to Opportunistic Spectrum Access Problem

The sense and access optimization problem in opportunistic spectrum access technology is considered. By introducing the concept of event, the original problem with countably infinite states is converted to an event-based decision problem with finite events. From a sensitivity-based view, the performance differences between two event-based policies are investigated. Based on the event-based performance difference formula, with the appropriate approximation, the sample-path based policy iteration algorithm is developed. An example is provided to illustrate the effectiveness and reasonableness of the proposed algorithm.