naa a22 4500 510796230 CHVBK 20180411083337.0 cr unu---uuuuu 180411e20130201xx s 000 0 eng 10.1007/s11277-012-0542-5 doi (NATIONALLICENCE)springer-10.1007/s11277-012-0542-5 Robust Relaying Schemes for Multiple-Antenna Multi-Relay Networks [Elektronische Daten] [Y. Attar Izi, A. Falahati] The optimal beamforming weight matrix for amplify and forward multiple-antenna multiple-relay network is investigated. It is assumed that the partial first and second hop channel state information (CSI) is available at relays. In order to minimize the mean square error (MSE) at destination, all relay weight matrices must be designed simultaneously under individual relay power constraints. Using the Lagrange dual variables, it is shown that this general vector optimization problem can be converted into a scalar optimization problem whose scalar Lagrange multipliers can be obtained numerically. This is the generalized version of the scheme suggested for complete CSI. The proposed scheme is evaluated through computer simulation with various numbers of relays and antennas to obtain MSE and bit error rate (BER) metrics. It is also shown that the resulting MSE and BER are less than those of the schemes available in the literature by a good margin depending upon the amount of the utilized relay and antennas as well as the estimation error. Springer Science+Business Media, LLC., 2012 Cooperative communication nationallicence Multiple-antenna multiple relay networks nationallicence Partial channel state information nationallicence Convex optimization nationallicence Amplify-Forward scheme nationallicence Attar Izi Y. Department of Electrical Engineering (DCCS Lab), Iran University of Science and Technology, Narmak, Tehran aut Falahati A. Department of Electrical Engineering (DCCS Lab), Iran University of Science and Technology, Narmak, Tehran aut Wireless Personal Communications Springer US; http://www.springer-ny.com 68/4(2013-02-01), 1611-1631 0929-6212 68:4<1611 2013 68 11277 https://doi.org/10.1007/s11277-012-0542-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0542-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Attar Izi Y. Department of Electrical Engineering (DCCS Lab), Iran University of Science and Technology, Narmak, Tehran aut NATIONALLICENCE 700 1- Falahati A. Department of Electrical Engineering (DCCS Lab), Iran University of Science and Technology, Narmak, Tehran aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 68/4(2013-02-01), 1611-1631 0929-6212 68:4<1611 2013 68 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer