认知无线电系统中顺序切换方法的性能分析
Performance Analysis of Sequential Method for Handover in Cognitive Radio Systems
摘要：
强大的频谱切换方案使认知无线电（CR）能够适当地利用主用户信道中的传输机会。在本文中，我们考虑认知接入的主信道由次要用户。我们评估的平均检测时间和最大可实现的平均吞吐量的次用户时，使用的顺序切换方法（SMHO）。我们假设主用户的存在和不存在概率的先验知识是可用的。当调查的最大可实现的吞吐量的次用户，我们结束到一个优化问题，其中必须选择最佳值的感测时间。在我们的优化问题中，我们考虑到由于主用户的错误检测而导致的频谱切换。我们还提出了一个加权的切换（WBHO）计划，其中信道条件和主用户的存在概率的影响被考虑。该频谱切换方案为SU提供了比SMHO方法更高的平均吞吐量。最大可实现的吞吐量和消耗的能量之间的权衡进行了讨论，最后提供了一个能量有效的优化配方，找到一个合适的感测时间。
英文摘要：
Powerful spectrum handover schemes enable cognitive radios (CRs) to use transmission opportunities in primary users' channels appropriately. In this paper, we consider the cognitive access of primary channels by a secondary user. We evaluate the average detection time and the maximum achievable average throughput of the secondary user when the sequential method for hand-over (SMHO) is used. We assume that a prior knowledge of the primary users' presence and absence probabilities are available. When investigating the maximum achievable throughput of the secondary user, we end into an optimization problem, in which the optimum value of sensing time must be selected. In our optimization problem, we take into account the spectrum hand over due to false detection of the primary user. We also propose a weighted based hand-over (WBHO) scheme in which the impacts of channels conditions and primary users' presence probability are considered. This Spectrum handover scheme provides higher average throughput for the SU than the SMHO method. The tradeoff between the maximum achievable throughput and consumed energy is discussed, and finally an energy efficient optimization formulation for finding a proper sensing time is provided.
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