AB  - Beamforming problems in amlify-forward (AF) wireless relay network can be formulated as nonconvex quadratically constrained quadratic programming (QCQP) problems which is very difficult to solve directly. Generally, by transforming a QCQP problem into a semi-definite program (SDP) and by relaxing rank-one constraints, the problem can be tackled essentially. If resulting matrices found after solving SDP problems are of rank-one then the task can be terminated. However, in some scenarios such as minimizing individual power constraints on relays, most of the rank-one dropped SDP solutions have rank higher than one. In this case, a nonsmooth reverse convex optimization technique is employed to solve the problem iteratively then rank-one solutions can be optimized numerically. © 2011 IEEE.
AU  - Phan, AH
AU  - Tuan, HD
AU  - Kha, HH
DA  - 2011/12/01
DO  - 10.1109/GLOCOM.2011.6134324
JO  - GLOBECOM - IEEE Global Telecommunications Conference
PY  - 2011/12/01
TI  - Optimized solutions for beamforming problems in amplify-forward wireless relay networks
Y1  - 2011/12/01
Y2  - 2026/05/20
ER  -