Weighted one bit hard combination for cooperative spectrum sensing is proposed in this paper. Two thresholds are adopted to divide the possible energy value into three weighted regions. If the energy value falls into ...Weighted one bit hard combination for cooperative spectrum sensing is proposed in this paper. Two thresholds are adopted to divide the possible energy value into three weighted regions. If the energy value falls into the corresponding region,it will be judged as "1",no information or "0". When the probability of false alarm is constrained to be constant,the objective is to maximize the probability of detection. The optimization problem is simplified by separating the weight of the middle region into several intervals. Simulation results show that the sensing performance of the proposed scheme is much better than that of the traditional one bit hard combination scheme and almost the same as that of the equal gain combination(EGC) scheme. Moreover,compared with the traditional one bit hard combination,fewer average sensing bits are required to transmit to the data fusion center with the proposed method.展开更多
A new analytical expression is presented for the instantaneous power Probability Density Function(PDF) of receiver signals over composite κ-μ/gamma fading channels.Moreover,the exact expression of channel capacity i...A new analytical expression is presented for the instantaneous power Probability Density Function(PDF) of receiver signals over composite κ-μ/gamma fading channels.Moreover,the exact expression of channel capacity is derived in the form of an infinite series,while an accurate approximation expression is obtained in closed form.To reveal the implications of the model parameters on capacity,we provide an expression for the case of a high-SNR environment.The relationship of the presented results with previously reported results on generalised-K and K fading channels is also discussed.Finally,numerical and simulation results are presented to prove the correctness of our derived expressions.展开更多
基金supported in part by the Hi-tech research and development program of China (2009AA011805)National Natural Science Foundation of China (61032002)+1 种基金the Important National Science and Technology Specifi c Projects of China (2009ZX03003-007)the Joint State Key Program of the National Natural Science Foundation of China and the National Railway Ministry of China (60830001)
文摘Weighted one bit hard combination for cooperative spectrum sensing is proposed in this paper. Two thresholds are adopted to divide the possible energy value into three weighted regions. If the energy value falls into the corresponding region,it will be judged as "1",no information or "0". When the probability of false alarm is constrained to be constant,the objective is to maximize the probability of detection. The optimization problem is simplified by separating the weight of the middle region into several intervals. Simulation results show that the sensing performance of the proposed scheme is much better than that of the traditional one bit hard combination scheme and almost the same as that of the equal gain combination(EGC) scheme. Moreover,compared with the traditional one bit hard combination,fewer average sensing bits are required to transmit to the data fusion center with the proposed method.
基金supported by the National NatNatural Science Foundation of China under Grants No. 61132003,No. 61101237the Open Research Fund of National Mobile Communications Research Laboratory,Southeast University under Grant No. 2012D07
文摘A new analytical expression is presented for the instantaneous power Probability Density Function(PDF) of receiver signals over composite κ-μ/gamma fading channels.Moreover,the exact expression of channel capacity is derived in the form of an infinite series,while an accurate approximation expression is obtained in closed form.To reveal the implications of the model parameters on capacity,we provide an expression for the case of a high-SNR environment.The relationship of the presented results with previously reported results on generalised-K and K fading channels is also discussed.Finally,numerical and simulation results are presented to prove the correctness of our derived expressions.
