2013/10/07 by Gözde Özcan, Ozcan, Gozde, M. Cenk Gursoy +3
Computer Science · Engineering · #Advanced MIMO Systems Optimization #Cognitive Radio Networks and Spectrum Sensing #Distributed Sensor Networks and Detection Algorithms #FOS: Computer and information sciences #Information Theory (cs.IT) #Wireless Communication Networks Research
paper · pdf · doi:10.48550/arxiv.1310.1822
openalex publication_date 2013/10/07 · openalex created_date 2025/10/24 · openalex updated_date 2026/07/28
This paper studies the symbol error rate performance of cognitive radio\ntransmissions in the presence of imperfect sensing decisions. Two different\ntransmission schemes, namely sensing-based spectrum sharing (SSS) and\nopportunistic spectrum access (OSA), are considered. In both schemes, secondary\nusers first perform channel sensing, albeit with possible errors. In SSS,\ndepending on the sensing decisions, they adapt the transmission power level and\ncoexist with primary users in the channel. On the other hand, in OSA, secondary\nusers are allowed to transmit only when the primary user activity is not\ndetected. Initially, for both transmission schemes, general formulations for\nthe optimal decision rule and error probabilities are provided for arbitrary\nmodulation schemes under the assumptions that the receiver is equipped with the\nsensing decision and perfect knowledge of the channel fading, and the primary\nuser's received faded signals at the secondary receiver has a Gaussian mixture\ndistribution. Subsequently, the general approach is specialized to rectangular\nquadrature amplitude modulation (QAM). More specifically, optimal decision rule\nis characterized for rectangular QAM, and closed-form expressions for the\naverage symbol error probability attained with the optimal detector are derived\nunder both transmit power and interference constraints. The effects of\nimperfect channel sensing decisions, interference from the primary user and its\nGaussian mixture model, and the transmit power and interference constraints on\nthe error rate performance of cognitive transmissions are analyzed.\n