Energy Efficient Cooperation with Chip-Interleaved Transceivers in WSNs Over Frequency-Selective Fading Channels

• Published in: Wireless personal communications Vol. 95; no. 4; pp. 3933 - 3953
• Main Authors: Tian, Jianjie, Berber, Stevan, Rowe, Gerard
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.08.2017; Springer Nature B.V
• Subjects: Bit error rate; Channels; Codes; Communications Engineering; Computer Communication Networks; Energy conservation; Energy management; Energy transmission; Engineering; Exact solutions; Indoor environments; Networks; Power efficiency; Remote sensors; Selective fading; Signal to noise ratio; Signal,Image and Speech Processing; Transceivers; Wireless sensor networks; Wireless sensor networks; Cooperative communication; Partner selection; Chip interleaving; Energy efficiency; Power allocation; Frequency-selective fading
• ISSN: 0929-6212; 1572-834X
• DOI: 10.1007/s11277-017-4033-6

Cooperative diversity techniques have been utilized to improve the energy efficiency of wireless sensor networks (WSNs) operating over flat fading channels in a considerable number of literature. However, wireless channels of WSNs operating in indoor environments are supposed to be characterised by frequency-selective fading. Theoretical analysis of energy efficient cooperative communications in WSNs operating in indoor environments are rarely addressed. Therefore, this paper studies the energy efficient cooperative communications in WSNs operating over frequency-selective fading channels. Closed-form bit error rate expressions are derived for systems over frequency-selective fading channels. In order to fully explore the energy conservation potential of cooperative communications, solutions of the optimal transmit power allocation and the partner node selection are provided. Moreover, it is proven that the communication quality can be greatly improved by using chip-interleaving techniques in WSNs subject to flat fading channels. Thus, this paper investigates the energy-saving potential of chip-interleaved transceivers in WSNs subject to frequency-selective fading. Numerical results show that significant energy savings can be achieved via cooperations with chip-interleaved transceivers in WSNs operating in indoor environments.