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Rate-optimal and reduced-complexity sequential sensing algorithms for cognitive OFDM radios

机译:认知OFDM无线电的速率最优和复杂度降低的顺序感知算法

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Sequential sensing algorithms are developed for OFDM-based hierarchical cognitive radio (CR) systems. Secondary users sense multiple sub-bands simultaneously for possible spectrum availabilities under hard miss-detection constraints to prevent interference to the primary users. Accounting for the fact that the sensing time overhead can often be significant, a performance metric is developed based on the effective achievable data rate. An optimization problem is formulated in the framework of optimal stopping problems to maximize the average effective data rate by determining the best time to stop taking samples for sensing, as well as the best set of channels to use for data transmission. A basis expansion-based sub-optimal algorithm is derived to reduce the prohibitive complexity of the optimal solution.
机译:顺序感测算法是为基于OFDM的层次认知无线电(CR)系统开发的。次要用户在硬漏检约束下同时感测多个子带以获得可能的频谱可用性,以防止对主要用户的干扰。考虑到感测时间开销通常可能很大的事实,因此基于有效的可达到数据速率来开发性能指标。在最佳停止问题的框架内制定了一个优化问题,以通过确定停止采样以进行感测的最佳时间以及用于数据传输的最佳通道集来最大化平均有效数据速率。推导了基于基本展开的次优算法,以降低最优解的过高复杂度。

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