Title :
Cycle frequency estimation of time/frequency diversity transmissions in a dense noise environment
Author_Institution :
US Naval Coastal Syst. Center, Panama City Beach, FL, USA
Abstract :
A cycle rate estimation technique for weak diversity transmissions in noise is presented. The processing procedure is based on performing a weighted-average discrete Wigner distribution inner product operation at the input to a discrete Fourier analyzer followed by a low-frequency block then a weighted running sum across the fast Fourier transform (FFT) analyzer output. Fourier transformation across overlapping blocks of the summed outputs are then averaged to produce a cycle frequency estimate. The cycle frequency estimator is tested on a frequency hopped Welch 11 code Costas array in 0-dB SNR and on a dual-tone frequency hop/4-ary frequency shift keyed (FSK) signal where random time jitter and Gaussian pulse shaping have been employed
Keywords :
diversity reception; frequency agility; frequency shift keying; noise; signal processing; 4-ary FSK; FFT analyzer; Gaussian pulse shaping; SNR; Welch 11 code Costas array; cycle frequency estimator; dense noise environment; discrete Fourier analyzer; dual tone frequency hop signal; fast Fourier transform; frequency diversity; inner product; low-frequency block; random time jitter; spread spectrum signal; time diversity; weak diversity transmissions; weighted running sum; weighted-average discrete Wigner distribution; Frequency diversity; Frequency estimation; Frequency modulation; Frequency shift keying; Performance analysis; Pulse modulation; Signal processing; Spread spectrum communication; Working environment noise; Yield estimation;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1992. ICASSP-92., 1992 IEEE International Conference on
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-0532-9
DOI :
10.1109/ICASSP.1992.226643
