Title :
Simple estimators for HF channel estimation
Author :
Hariharan, S. ; Clark, A.P.
Author_Institution :
Telecommun. Eng. Center, New Delhi, India
Abstract :
A comparison is made of four different estimators, for estimating the sampled impulse-response (SIR) of an HF radio link that is designed for the transmission of analog speech signals. The particular application studied is the transmission of digital data at 4800 bit/s, employing a serial quadrature phase shift keyed (QPSK) signal with a carrier frequency of 1800 Hz. The HF radio link is modeled as having three different Rayleigh-fading paths (sky waves). System 1 is the conventional gradient (least mean square, or LMS) estimator while system 2 is the gradient estimator with degree-1 least-squares fading memory prediction. Systems 3 and 4 are novel and are developments of system 2. Results of computer simulation tests on the four different estimators are presented
Keywords :
data communication systems; least squares approximations; phase shift keying; radio links; telecommunication channels; 1800 Hz; 4800 bit/s; HF channel estimation; HF radio link; Rayleigh-fading paths; digital data; digital data transmission; gradient estimator; least-squares fading memory prediction; sampled impulse-response; serial OPSK signal; serial quadrature phase shift keyed; sky waves; Channel estimation; Frequency shift keying; Hafnium; Least squares approximation; Quadrature phase shift keying; RF signals; Radio link; Rayleigh channels; Signal design; Speech;
Conference_Titel :
TENCON '89. Fourth IEEE Region 10 International Conference
Conference_Location :
Bombay
DOI :
10.1109/TENCON.1989.176927
