مرکز منطقه ای اطلاع رسانی علوم و فناوری Journal of Information Systems and Telecommunication (JIST) 2322-1437 1 4 2013 12 20 Multiple Antenna Relay Beamforming for Wireless Peer to Peer Communications Multiple Antenna Relay Beamforming for Wireless Peer to Peer Communications 1 10 10.7508/jist.2013.04.001 en Mohammad Hossein Golbon Haghighi Communication, K. N. Toosi University of Technology Behrad Mahboobi K. N. Toosi Mehrdad Ardebilipour K. N. Toosi 2014 10 22 This paper deals with optimal beamforming in wireless multiple-input-multiple-output (MIMO) relay networks that involves multiple concurrent source-destination pairs with imperfect channel state information (CSI) at the relays. Our aim is the optimization of the MIMO relay weights that minimize the total relay transmit power subject to signal-to-interference-plus-noise ratio (SINR) of all destinations to be kept above a certain threshold. Since power minimization is a non-convex quadratically constrained quadratic programming (QCQP), we use semi-definite programming (SDP) relaxation of above mentioned problem by using a randomization technique. Numerical Monte Carlo simulations verify the performance gain of our proposed multiple antenna relay system in terms of transmit power and symbol error probability. MIMO-Relay Networks Power Allocation Beamforming Semi-Definite Programming http://jist.ir/en/Article/Download/14831