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Optimization of Multiuser MIMO Cooperative Spectrum Sensing in Cognitive Radio Networks

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This paper investigates the multiuser multiple-input–multiple-output (MIMO) linear cooperative spectrum sensing optimization problem, in which the primary user (PU) and the cognitive radio (CR) are equipped with multiple antennas. By optimizing the different weights assigned on the received signals of CRs, the cooperative spectrum sensing optimization aims at maximizing the probability of detection given a targeted probability of false alarm. Statistical characteristics of parameters in MIMO cooperative spectrum sensing systems have been determined for the PU with a single antenna and the CR with multiple antennas, the PU with multiple antennas and the CR with a single antenna, and both the PU and the CR with multiple antennas. Because of the non-convex characteristic of the optimization problem, an alternative approach based on a genetic algorithm (GA) instead of convex approaches is proposed to find the optimal weight vectors without solution domain restrictions and convexity constraints. Furthermore, several classical GA crossover operators have been provided to investigate their effect on sensing performance. The simulation results show that, the reliability of spectrum sensing in cooperative spectrum sensing system can be significantly improved with multiple antennas. Furthermore, the GA method is a promising approach in addressing the cooperative spectrum sensing problem.

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The authors would like to show our gratitude to reviewers for insightful comments and suggestions that have enhanced the quality and readability of this paper. This work was supported by the 111 Project (B08038), the National Science Foundation of China under Grant (61101069,61201134,61201135) and the Fundamental Research Funds for the Central Universities (JB140107, K5051302022,72132826), the National Key Project of New Generation Broad Band Wireless Communication (2012ZX03001027-001).

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Correspondence to Yongqiang Hei.

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Hei, Y., Li, W., Li, M. et al. Optimization of Multiuser MIMO Cooperative Spectrum Sensing in Cognitive Radio Networks. Cogn Comput 7, 359–368 (2015).

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