To improve the reliable performance of information transmission in cooperative relay networks, the scheme of the max-rate spatial channel pairing （SCP） based on maximum ratio combining （MRC） is proposed. The schem...
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To improve the reliable performance of information transmission in cooperative relay networks, the scheme of the max-rate spatial channel pairing （SCP） based on maximum ratio combining （MRC） is proposed. The scheme includes three steps： channel phase cancellation, MRC, and SCP. Eventually, the solution of the scheme is modeled as convex optimization. The objective function of the optimization problem is to maximize the transmission rate and the optimization variable is the strategy of pairing between the uplink spatial sub-channels of each user and the corresponding downlink spatial ones. The theorem of the arrangement inequalities is adopted to obtain the approximate closed-form solution of the optimal pairing for this convex optimization. Simulation results demonstrate that compared to the existing distributed space-time block coding and coherent combined schemes without SCP, the proposed max-rate SCP plus MRC algorithm achieves appreciable improvements in symbol error rate in medium and high signal-to-noise ratio regimes. The achievable performance gain is due to the use of maxrate SCP.
通过序贯检测可以提高协作频谱感知的准确度,但是在具有频谱感知数据窜改(spectrum sensing data falsification,SSDF)节点的环境下,系统感知性能急剧下降。为了解决上述问题,提出了一种基于加权序贯检测(weighted sequential probabili...
详细信息
通过序贯检测可以提高协作频谱感知的准确度,但是在具有频谱感知数据窜改(spectrum sensing data falsification,SSDF)节点的环境下,系统感知性能急剧下降。为了解决上述问题,提出了一种基于加权序贯检测(weighted sequential probability ratio test,WSPRT)的频谱感知融合算法。通过给每个节点赋予信誉度权值,设置合理的信誉度奖惩方案来区分SSDF节点,从而优化系统感知性能。仿真实验表明,所提出的算法减少了SSDF节点带来的影响,提高了系统的检测准确率和稳定性。
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