Cooperative Spectrum Sensing via Belief Propagation in Spectrum-Heterogeneous Cognitive Radio Systems
Cooperative Spectrum Sensing via Belief Propagation in Spectrum-Heterogeneous Cognitive Radio Systems
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DOI：
10.1109/wcnc.2010.5506422
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发表时间：
2010-04
期刊：
影响因子：
--
通讯作者：
Husheng Li
中科院分区：
文献类型：
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作者：
Husheng Li
在异质认知无线电系统中，不同的次用户可能会受到主用户不同活动的影响，从而使得联合协作频谱感知变得困难。然而，相互靠近的二次用户之间通常存在很强的相关性，这对频谱感知有很大的好处。为了利用这种相关性，将信念传播(BP)应用于异质认知无线电系统中的协作频谱感知。为了便于BP中的消息计算和传递，提出了简化和假设。数值结果表明，与单用户频谱感知相比，基于BP的协作频谱感知只需几次迭代即可显著提高系统性能。仿真还表明，该算法的性能不受二次用户之间相互距离的知识以及用于量化信任度、通信范围和丢包率的比特数的影响。
In a heterogeneous cognitive radio system, different secondary users may suffer from different activities of primary user, thus making a joint cooperative spectrum sensing difficult. However, there typically exists strong correlation among secondary users located close to each other, which can substantially benefit the spectrum sensing. To leverage the correlation, belief propagation (BP) is applied for cooperative spectrum sensing in heterogeneous cognitive radio systems. Simplifications and assumptions are proposed to facilitate the message computing and passing in BP. Numerical results show that the BP based cooperative spectrum sensing can significantly improve the performance over single-user spectrum sensing using only a few iterations. Simulation also shows that the performance is insensitive to the knowledge of mutual distance between secondary users, as well as the number of bits used to quantize beliefs, the communication range and packet loss.