Title :
Rapid and stable optimization of CMA adaptive array by Marquardt method
Author :
Kikuma, N. ; Fujimoto, M. ; Inagaki, N.
Author_Institution :
Dept. of Electr. & Comput. Eng., Nagoya Inst. of Technol., Japan
Abstract :
The authors present a rapidly converging and well-conditioned algorithm based on the nonlinear least squares method referred to as the Marquardt method for the CMA (constant modulus algorithm) adaptive array. Computer simulation with a pi /4-shifted QPSK (quadrature phase-shift keying) signal verified its rapid and stable convergence characteristics for any radio environment. Taking into consideration the increase of computation for one weight update, the Marquardt method can reduce the convergence time by a factor of 10 to 100 compared to the steepest descent method.<>
Keywords :
convergence of numerical methods; optimisation; signal processing; Marquardt method; constant modulus algorithm; convergence time; nonlinear least squares method; optimization; pi /4-shifted QPSK; quadrature phase-shift keying; radio environment; rapid stable convergence; Adaptive arrays; Antenna arrays; Computer simulation; Convergence; Cost function; Gaussian processes; Land mobile radio; Least squares methods; Mobile communication; Optimization methods;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1991. AP-S. Digest
Conference_Location :
London, Ontario, Canada
Print_ISBN :
0-7803-0144-7
DOI :
10.1109/APS.1991.174783
