Cooperative Spectrum Sensing With Random Access Reporting Channels in Cognitive Radio Networks

Raed Alhamad, Huaxia Wang, Yu-Dong Yao
2017 IEEE Transactions on Vehicular Technology  
In cognitive radio networks, cooperative spectrum sensing is utilized to improve sensing performance to avoid potential interference to primary users (PUs) and increase spectrum access opportunities for secondary users (SUs). A cooperative spectrum sensing process is divided into three phases, individual sensing/detection, reporting/fusion and data transmission. In the reporting phase, one or more reporting channels are needed to transmit individual sensing results to a fusion center (FC), and
more » ... n center (FC), and global spectrum sensing results are determined at FC. The number of required reporting channels depends on the number of spectrum sensors or SUs, which relates to reporting channel efficiency and channel scheduling complexity. That is to say, the reporting channel design can be a challenge, especially when fixed assignment scheduling is used. Therefore, in this paper, we design a reporting channel scheme based on random access protocols, including slotted Aloha (S-Aloha) and reservation-Aloha (R-Aloha). Performance evaluations in terms of PU detection probabilities and false alarm probabilities considering the proposed reporting channels are presented. In addition, the impact of soft/unquantized spectrum sensors or detectors (SUs) and malicious SUs are considered in this paper. Analytical and simulation results illustrate the effectiveness of the proposed reporting channel scheduling methods in improving cooperative spectrum sensing performance. Index Terms-Cognitive radio, cooperative spectrum sensing, random access. R. Alhamad is with College
doi:10.1109/tvt.2017.2657485 fatcat:ivj7hncehbgipobbd4yjrvhtwi