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首页> 外文会议>Information Sciences and Systems, 2009. CISS 2009 >Cooperative sensing of primary users in cognitive radio networks based on message passing
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Cooperative sensing of primary users in cognitive radio networks based on message passing

机译：基于消息传递的认知无线电网络中主要用户的协作感知

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Opportunistic access to temporarily unused licensed frequency bands has been recognized as a cost-effective solution to mitigate the scarcity of radio spectrum incurred by the proliferation and evolution of wireless devices. In order to accomplish a more efficient spectrum utilization across time, space and frequency, the functionality of spectral awareness is expected to be incorporated into transceivers of cognitive radios (CR) in the foreseeable future. However, the agility requirements imposed on an individual CR might be very stringent since the spectrum has to be monitored on a continuous basis and the spectral holes must be detected reliably in the presence of channel fading and/or hardware failure, especially in a broadband wireless network with multiple primary users. To remedy this problem, light-weight collaboration among CRs becomes attractive since distributed signal processing can exploit the spatial diversity through network cooperation to improve the sensing reliability. To this end, we extend the classical framework for distributed detection of a single user to the case of multiuser detection, and introduce a Tanner graph description of the network topology. We designate the transmission pattern of primaries by a binary space-frequency signature sequence and view all possible patterns collectively as a low-density parity check (LDPC) codebook. Then, we invoke belief propagation message passing algorithm across the entire CR network to infer the unknown pattern iteratively from the noisy observations of all spectrum sensors. Based on the pattern inferred, the fusion centers can determine the spectral and spatial access pattern of secondary users, without interfering with the normal functioning of incumbent primaries.
机译：机会性地访问暂时未使用的许可频段是一种经济有效的解决方案，可缓解无线设备的扩散和发展所引起的无线电频谱短缺。为了在时间，空间和频率上实现更有效的频谱利用，预计在可预见的将来，频谱感知功能将被纳入认知无线电（CR）的收发器中。但是，由于必须连续监控频谱，并且必须在存在信道衰落和/或硬件故障的情况下（尤其是在宽带无线网络中）可靠地检测频谱孔，因此对单个CR施加的敏捷性要求可能非常严格。具有多个主要用户的网络。为了解决这个问题，CR之间的轻量级协作变得很有吸引力，因为分布式信号处理可以通过网络协作利用空间分集来提高传感可靠性。为此，我们将用于单个用户的分布式检测的经典框架扩展到多用户检测的情况，并介绍了网络拓扑的Tanner图描述。我们通过二进制空间频率签名序列指定原语的传输模式，并将所有可能的模式集中查看为低密度奇偶校验（LDPC）码本。然后，我们调用整个CR网络上的置信传播消息传递算法，以从所有频谱传感器的嘈杂观测中迭代地推断出未知模式。根据推断出的模式，融合中心可以确定二级用户的频谱和空间访问模式，而不会干扰现有主要用户的正常功能。

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