Title :
Discrete Receive Beamforming
Author :
Israel, Johannes ; Fischer, Anath ; Martinovic, John ; Jorswieck, Eduard A. ; Mesyagutov, Marat
Author_Institution :
Inst. of Numerical Math., Tech. Univ. Dresden, Dresden, Germany
Abstract :
We present a new approach for analog receive beamforming if phase shifters and amplifiers have finite resolution only. Then, the maximization of the signal-to-interference-plus-noise ratio (SINR) is a discrete optimization problem with a nonconcave objective function. The discrete maximization problem is solved exactly by means of a branch-and-bound algorithm. Based on the Capon method, we derive a new and efficient way of computing upper SINR-bounds for the subproblems occurring at the nodes of the branch-and-bound tree. Results of numerical simulations are provided and compared to an earlier approximate approach.
Keywords :
array signal processing; optimisation; radio receivers; tree searching; Capon method; analog receive beamforming; branch-and-bound algorithm; branch-and-bound tree; discrete maximization problem; discrete optimization problem; discrete receive beamforming; finite resolution amplifiers; finite resolution phase shifters; nonconcave objective function; signal-to-interference-plus-noise ratio; Array signal processing; Arrays; Interference; Signal processing algorithms; Signal to noise ratio; Upper bound; Vectors; Branch-and-bound; SINR maximization; discrete antenna weights; receive beamforming;
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2014.2379333