Title :
New Optimized Solution Method for Beamforming in Cognitive Multicast Transmission
Author :
Phan, A.H. ; Tuan, H.D. ; Kha, H.H.
Author_Institution :
Sch. of Electr. Eng. & Telecommun., Univ. of New South Wales, Sydney, NSW, Australia
Abstract :
The optimal beamforming for cognitive multicast transmission is nonconvex rank-one constrained optimization problem. For a solution, a popular method is the combination of relaxed convex semi-definite programming, where the rank-one constraint is dropped, and randomization. We show that in many cases, this method cannot give satisfactory solutions. As an initial step, we develop a simple alternative method, which gives much better solutions. Our simulation confirms this fact.
Keywords :
array signal processing; cognitive radio; multicast communication; optimisation; cognitive multicast transmission; optimal beamforming; optimization problem; optimized solution method; randomization; rank-one constraint; relaxed convex semidefinite programming; Array signal processing; Downlink; Interference; Optimization; Receivers; Signal to noise ratio; Transmitters;
Conference_Titel :
Vehicular Technology Conference Fall (VTC 2010-Fall), 2010 IEEE 72nd
Conference_Location :
Ottawa, ON
Print_ISBN :
978-1-4244-3573-9
Electronic_ISBN :
1090-3038
DOI :
10.1109/VETECF.2010.5594325
