QUADRATICALLY CONSTRAINED ADAPTIVE BEAMFORMING FOR COHERENT SIGNALS AND INTERFERENCE

被引:15
作者
QIAN, F
VANVEEN, BD
机构
[1] Department of Electrical and Computer Engineering, University of Wisconsin, Madison
基金
美国国家科学基金会;
关键词
D O I
10.1109/78.403348
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Severe signal cancellation often occurs in conventional adaptive beamforming if coherent interferers are present, This paper proposes adding quadratic constraints to a linearly constrained minimum variance (LCMV) adaptive beamformer to prevent signal cancellation in coherent interference environments, The additional constraint limits the beamformer output mean squared error to be less than a specified level, It is shown that if the quadratic constraint is properly chosen, then the original linearly constrained beamformer's signal cancellation is reduced to an arbitrarily small level while the interference cancellation is unchanged. In practice, the quadratic constraint is constructed based on estimates of the interference parameters. Sensitivity analyses show the performance of the resulting beamformer is robust with respect to this approximate constraint, The effectiveness of the quadratically constrained adaptive beamformer is further illustrated through simulations.
引用
收藏
页码:1890 / 1900
页数:11
相关论文
共 16 条
[1]   ROBUST ADAPTIVE BEAMFORMING [J].
COX, H ;
ZESKIND, RM ;
OWEN, MM .
IEEE TRANSACTIONS ON ACOUSTICS SPEECH AND SIGNAL PROCESSING, 1987, 35 (10) :1365-1376
[2]  
DUVALL K, 1983, THESIS STANFORD U
[3]  
Elden L., 1977, BIT (Nordisk Tidskrift for Informationsbehandling), V17, P134, DOI 10.1007/BF01932285
[4]   AN APPLICATION OF SYSTOLIC ARRAYS TO LINEAR DISCRETE ILL-POSED PROBLEMS [J].
ELDEN, L ;
SCHREIBER, R .
SIAM JOURNAL ON SCIENTIFIC AND STATISTICAL COMPUTING, 1986, 7 (03) :892-903
[5]   AN ALTERNATIVE FORMULATION FOR AN OPTIMUM BEAMFORMER WITH ROBUSTNESS CAPABILITY [J].
ER, MH ;
CANTONI, A .
IEE PROCEEDINGS-F RADAR AND SIGNAL PROCESSING, 1985, 132 (06) :447-460
[6]   ALGORITHM FOR LINEARLY CONSTRAINED ADAPTIVE ARRAY PROCESSING [J].
FROST, OL .
PROCEEDINGS OF THE INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, 1972, 60 (08) :926-&
[8]   AN ALTERNATIVE APPROACH TO LINEARLY CONSTRAINED ADAPTIVE BEAMFORMING [J].
GRIFFITHS, LJ ;
JIM, CW .
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 1982, 30 (01) :27-34
[9]  
LAWSON CL, 1974, SOLVING LEAST SQUARE, P42
[10]  
QIAN F, 1992, 1992 P ICASSP, V4, P441