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A decision confidence based multiuser MIMO cooperative spectrum sensing in CRNs

机译：CRN中基于决策置信度的多用户MIMO协作频谱感知

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摘要

In this paper, we propose a novel spectrum sensing scheme for multiuser multiple-input-multiple-output cooperative cognitive radio networks and a decision confidence algorithm for the antenna selection in FC to reduce its computational burden. Here first, a log-likelihood-ratio test (LRT) based energy detection of primary user link is performed by each secondary user employing multiple receive antennas and with imperfect channel state information. Next, the local decision is sent to the fusion center (FC) via multiple transmit antennas to combat the hidden node problem. Finally, the global decision is made at FC, equipped with multiple receive antennas using maximal ratio combining algorithm considering correlated fading channel between FC and SUs. Closed form expressions are obtained for probability of detection (P d ) and probability of false alarm. The performance evaluations show that the P-d >= 0.95 with N-t = 2, N-rf = 8, SNR = -5 dB at P-fa = 0.1 is achieved with the proposed scheme even in the presence of antenna interference between the MIMO channel. Further, the proposed scheme reduces the overall computational complexity and time complexity of MIMO cooperative sensing technique. (C) 2020 Elsevier B.V. All rights reserved.
机译：在本文中，我们提出了一种用于多用户多输入多输出协作认知无线电网络的新颖频谱感知方案，以及一种用于FC中天线选择的决策置信算法，以减轻其计算负担。在此，首先，由每个次要用户使用多个接收天线并使用不完善的信道状态信息来执行对主要用户链路的基于对数似然比测试（LRT）的能量检测。接下来，将本地决策通过多个发射天线发送到融合中心（FC），以解决隐藏节点问题。最后，在考虑到FC和SU之间的相关衰落信道的情况下，使用最大比合并算法在配备有多个接收天线的FC上做出全局决策。获得检测概率（P d）和虚警概率的闭式表达式。性能评估表明，即使在MIMO信道之间存在天线干扰的情况下，使用本发明的方案也可以实现N-t = 2，N-rf = 8，P-fa = 0.1时SNR = -5 dB的P-d> = 0.95。此外，提出的方案降低了MIMO协作感测技术的总体计算复杂度和时间复杂度。 （C）2020 Elsevier B.V.保留所有权利。

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