Accession Number : ADA136461

Title :   The Performance of an LMS (Least Mean Square) Adaptive Array with Frequency Hopped Signals.

Descriptive Note : Technical rept.,


Personal Author(s) : Acar,L ; Compton,R T , Jr

PDF Url : ADA136461

Report Date : Jun 1983

Pagination or Media Count : 45

Abstract : This report examines the performance of an LMS adaptive array with a frequency hopped, spread spectrum desired signal and a CW interference signal. It is shown that frequency hopping has several effects on an adaptive array. It causes the array to modulate both the amplitude and the phase of the received signal. Also, it causes the array output SINR (signal-to-interference-plus-noise ratio) to vary with time and thus increases the bit error probability for the received signal. Typical curves of the desired signal modulation and the time-varying SINR at the array output are presented. It is shown how the array performance depends on hopping frequency, frequency jump size, interference frequency, signal arrival angles and signal powers.

Descriptors :   *Antenna arrays, *Adaptive systems, *Spread spectrum, *Least squares method, *Algorithms, Signal processing, Signal to noise ratio, Amplitude modulation, Error analysis, Demodulation, Continuous waves, Interference, Angle of arrival, Antenna radiation patterns

Subject Categories : Electrical and Electronic Equipment
      Statistics and Probability
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE