Open AccessA New Blind Beamforming Procedure Based on The Conjugate Gradient Method for CDMA Mobile Communications
Author(s) -
Shin Eung Soon,
Choi Seung Won,
Shim Dong Hee,
Kyeong Mun Geon,
Chang Kyung Hi,
Park Youn Ok,
Han Ki Chul,
Lee Chung Kun
Publication year - 1998
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.98.0198.0202
Subject(s) - beamforming , code division multiple access , computer science , electronic engineering , digital signal processing , antenna (radio) , bit error rate , adaptive beamformer , weight , smart antenna , signal (programming language) , interference (communication) , space division multiple access , conjugate gradient method , algorithm , telecommunications , engineering , mathematics , base station , directional antenna , channel (broadcasting) , decoding methods , lie algebra , pure mathematics , programming language
The objective of this paper is to present an adaptive algorithm for computing the weight vector which provides a beam pattern having its maximum gain along the direction of the mobile target signal source in the presence of interfering signals within a cell. The conjugate gradient method (CGM) is modified in such a way that the suboptimal weight vector is produced with the computational load of O(16N), which has been found to be small enough for the real‐time processing of signals in most land mobile communications with the digital signal processor (DSP) off the shelf, where N denotes the number of antenna elements of the array. The adaptive procedure proposed in this paper is applied to code division multiple access (CDMA) mobile communication system to show its excellent performance in terms of signal to interference plus noise ratio (SINR), bit error rate (BER), and capacity, which are enhanced by about 7 dB, times, and 7 times, respectively, when the number of antenna elements is 6 and the processing gain is 20 dB.