naa a22 4500 510797563 CHVBK 20180411083342.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s11277-013-1034-y doi (NATIONALLICENCE)springer-10.1007/s11277-013-1034-y A Low-Complexity Hybrid Framework for Combining-Type Non-regenerative MIMO Relaying [Elektronische Daten] [Chao Zhao, Benoît Champagne] Combining-type relay systems can benefit from distributed array gain if the signals retransmitted from different relays are superimposed coherently at the destination. For this purpose, we propose a low-complexity hybrid framework in which the non-regenerative multiple-input-multiple-output relaying matrix at each relay is generated by cascading two substructures, akin to an equalizer for the backward channel and a precoder for the forward channel. For each of these two substructures, we introduced two one-dimensional parametric families of candidate matrix transformations. The first family, non-cooperative by nature, depends only on the backward or forward channel of the same relay. The second (cooperative) family also makes use of information derived from the channels of other relays. This hybrid framework allows for the classification and comparison of all possible combinations of these substructures, including several previously investigated methods and their generalizations. The design parameters can be optimized based on individual channel realizations or on channel statistics; in the latter case, the optimum parameters can be well approximated by linear functions of the signal-to-noise ratios. The proposed methods achieve a good balance between performance and complexity: they outperform existing low-complexity strategies by a large margin in terms of both capacity and bit-error rate, and at the same time, are significantly simpler than previous near-optimal iterative algorithms. Springer Science+Business Media New York, 2013 Combining-type nationallicence Distributed array gain nationallicence Hybrid relaying nationallicence MIMO nationallicence Non-regenerative relaying nationallicence Zhao Chao Department of Electrical and Computer Engineering, McGill University, 3480 University Street, H3A 0E9, Montreal, QC, Canada aut Champagne Benoît Department of Electrical and Computer Engineering, McGill University, 3480 University Street, H3A 0E9, Montreal, QC, Canada aut Wireless Personal Communications Springer US; http://www.springer-ny.com 72/1(2013-09-01), 635-652 0929-6212 72:1<635 2013 72 11277 https://doi.org/10.1007/s11277-013-1034-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-013-1034-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhao Chao Department of Electrical and Computer Engineering, McGill University, 3480 University Street, H3A 0E9, Montreal, QC, Canada aut NATIONALLICENCE 700 1- Champagne Benoît Department of Electrical and Computer Engineering, McGill University, 3480 University Street, H3A 0E9, Montreal, QC, Canada aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 72/1(2013-09-01), 635-652 0929-6212 72:1<635 2013 72 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer