Title :
A variable step-size CM array algorithm for fast fading channels
Author :
Mathur, Amit ; Keerthi, Arvind V. ; Shyok, J.J.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA
fDate :
4/1/1997 12:00:00 AM
Abstract :
A new constant modulus (CM) array algorithm with a time-varying step size is presented. It is designed for use in a cascade multistage system where each beamformer stage recovers one cochannel source. We assume that each source has a small angular spread and that the antenna elements are closely spaced. For this scenario, the new algorithm ensures that a stage tracks the same source during fast fading conditions, thus yielding reliable source estimation in a nonstationary environment. We present the cost function associated with the algorithm and compare it with that of the original CM array. Computer simulations for Rayleigh fading channels are presented to illustrate the improved tracking behavior of the multistage CM array
Keywords :
Rayleigh channels; array signal processing; direction-of-arrival estimation; fading; multipath channels; tracking; Rayleigh fading channels; beamformer stage; cascade multistage system; closely spaced antenna elements; cochannel source recovery; computer simulations; constant modulus array algorithm; cost function; fast fading channel; multipath; multistage CM array; nonstationary environment; small angular spread; source estimation; time-varying step size; tracking behavior; variable step-size CM array algorithm; Adaptive arrays; Adaptive systems; Antenna arrays; Computer simulation; Cost function; Fading; Rayleigh channels; Signal processing; Signal processing algorithms; Yield estimation;
Journal_Title :
Signal Processing, IEEE Transactions on
