摘要
Abstract Wireless sensor networks （WSNs） have been paid more attention in recent years. However, energy efficiency is still a troublesome issue in real WSN applications. In this paper, we studied the performance of a virtual multiple-input multiple-output （VMIMO）-based communications architecture for WSN applications. By analyzing the bit error rate （BER） of each cooperative branch, we presented the closed-form expressions for optimal transmitting power （TP） scheme in K~ 1 VMIMO cluster-based system. Then, the impact of the number of cooperating nodes on energy efficiency with energy-per- useful-bit （EPUB） metric was studied. Performance enhancement of the strategy with optimal TP assignment was verified by extensive simulations under different scenes. A thorough explanation of optimally choosing the number of cooperating nodes was also delivered by the aid of simulation verifications.
Abstract Wireless sensor networks （WSNs） have been paid more attention in recent years. However, energy efficiency is still a troublesome issue in real WSN applications. In this paper, we studied the performance of a virtual multiple-input multiple-output （VMIMO）-based communications architecture for WSN applications. By analyzing the bit error rate （BER） of each cooperative branch, we presented the closed-form expressions for optimal transmitting power （TP） scheme in K~ 1 VMIMO cluster-based system. Then, the impact of the number of cooperating nodes on energy efficiency with energy-per- useful-bit （EPUB） metric was studied. Performance enhancement of the strategy with optimal TP assignment was verified by extensive simulations under different scenes. A thorough explanation of optimally choosing the number of cooperating nodes was also delivered by the aid of simulation verifications.
