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Bidirectional secondary transmissions with energy harvesting in cognitive wireless sensor networks

Journal of Central South University 2018年第11期25卷 2626-2640页

作者： TANG Kun SHI Rong-hua ZHANG Ming-ying SHI He-yuan LEI Wen-tai School of Information Science and Engineering Central South UniversityChangsha 410083China China Electronics Standardization Institute Beijing 100007China School of Software Tsinghua UniversityBeijing 100084China

To the existing spectrum sharing schemes in wireless-powered cognitive wireless sensor networks,the protocols are limited to either separate the primary and the secondary transmission or allow the secondary user to transmit signals in a time slot when it forwards the primary *** order to address this limitation,a novel cooperative spectrum sharing scheme is proposed,where the secondary transmission is multiplexed with both the primary transmission and the relay ***,the process of transmission is on a three-phase time-switching relaying *** the first phase,a cognitive sensor node SU1 scavenges energy from the primary *** the second phase,another sensor node SU2 and primary transmitter simultaneously transmit signals to the *** the third phase,the node SU1 can assist the primary transmission to acquire the opportunity of spectrum *** decoding and interference cancellation technique is adopted at the receivers to retrieve the desired *** further derive the closed-form expressions for the outage probabilities of both the primary and secondary ***,we address optimization of energy harvesting duration and power allocation coefficient strategy under performance *** effective algorithm is then presented to solve the optimization *** results demonstrate that with the optimized solutions,the sensor nodes with the proposed cooperative spectrum sharing scheme can utilize the spectrum in a more efficient manner without deteriorating the performance of the primary transmission,as compared with the existing one-directional scheme in the literature.

关键词： cooperative transmission cognitive wireless sensor network time-switching relaying wireless energy harvesting joint optimization

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