Title :
A LMS and RLS look-ahead adaptive array for spread spectrum signals
Author :
Petroit, R.G. ; Ucci, D.R.
Author_Institution :
Dept. of Electr. & Comput. Eng., Illinois Inst. of Technol., Chicago, IL, USA
Abstract :
The output signal-to-interference-plus-noise ratio (SINR) performance of an adaptive array in a frequency-hopped (FH) environment is examined. The combined effect of the array´s interference nulling ability and the interference protection of FH signals results in a more robust interference rejection communication system. However, frequency hopping degrades the output SINR and thus increases the bit error probability. A look-ahead system that minimizes this variation in the output SINR is proposed. The least mean square (LMS) algorithm and the recursive least squares (RLS) algorithm are discussed. The objective is to compare the performance of the look-ahead adaptive system operating under the control of these algorithms in a frequency-hopping environment.<>
Keywords :
adaptive filters; antenna phased arrays; frequency agility; interference suppression; least squares approximations; signal processing; spread spectrum communication; LMS; RLS; antenna array; bit error probability; communication system; frequency hopping; interference nulling ability; interference protection; least mean square algorithm; look-ahead adaptive array; output SINR; recursive least squares algorithm; signal processing; signal-to-interference-plus-noise ratio; spread spectrum signals; Adaptive arrays; Degradation; Frequency; Interference; Least squares approximation; Protection; Resonance light scattering; Robustness; Signal to noise ratio; Spread spectrum communication;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1990. AP-S. Merging Technologies for the 90's. Digest.
Conference_Location :
Dallas, TX, USA
DOI :
10.1109/APS.1990.115385
