naa a22 4500 510797903 CHVBK 20180411083343.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s11277-013-1004-4 doi (NATIONALLICENCE)springer-10.1007/s11277-013-1004-4 BER-Constrained Incremental Relaying with Relay Selection in Cooperative Wireless Networks [Elektronische Daten] [Ali Bastami, Ali Olfat] One of the main drawbacks of cooperative communication systems with half-duplex relaying is inefficient use of spectrum. Incremental relaying is an effective technique that overcomes this limitation, particularly in the high-SNR regime. In this paper, for a multi-relay cooperative network with arbitrary number of relay nodes, we propose a spectrally-efficient incremental relaying scheme that eliminates redundant relay transmissions such that an average end-to-end bit error rate (BER) constraint is satisfied. For detect-and-forward relaying, under the assumption of error propagation from the relays to the destination, we analyze the performance of the system in terms of the end-to-end BER, the average spectral efficiency and the outage probability for Rayleigh fading environment. The performance of the system depends on a single threshold employed by the relays and the destination. We optimize this threshold such that the average spectral efficiency of the system is maximized under an average end-to-end BER constraint. This optimization criterion results in a constant-BER, variable-spectral efficiency relaying scheme. The proposed scheme makes use of spectrum as efficiently as possible, while providing the required quality of service at the destination. Springer Science+Business Media New York, 2013 Constrained optimization problem nationallicence Cooperative communications nationallicence Error propagation nationallicence Incremental relaying nationallicence Quality of service (QoS) nationallicence Relay selection nationallicence Spectral efficiency nationallicence Bastami Ali Department of Electrical and Computer Engineering, K.N. Toosi University of Technology, Tehran, Iran aut Olfat Ali Signal Processing and Communication Systems Laboratory, School of Electrical and Computer Engineering, University of Tehran, Tehran, Iran aut Wireless Personal Communications Springer US; http://www.springer-ny.com 72/1(2013-09-01), 121-136 0929-6212 72:1<121 2013 72 11277 https://doi.org/10.1007/s11277-013-1004-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-013-1004-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bastami Ali Department of Electrical and Computer Engineering, K.N. Toosi University of Technology, Tehran, Iran aut NATIONALLICENCE 700 1- Olfat Ali Signal Processing and Communication Systems Laboratory, School of Electrical and Computer Engineering, University of Tehran, Tehran, Iran aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 72/1(2013-09-01), 121-136 0929-6212 72:1<121 2013 72 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer