Title :
Diversity receiver for a serial HF modem
Author :
Müller, G.S. ; Pauw, C.K.
Author_Institution :
Dept. of Electron. & Comput. Eng., Pretoria Univ., South Africa
Abstract :
Two versions of a high-frequency (HF) diversity combination structure for use with an equalizer were investigated via a modem simulation. The two equalizers differ only in the way the weighting coefficients are generated. The output of each receiver is processed by an automatic gain control circuit. This signal is demodulated and fed into a decision-feedback equalizer. The outputs of the two equalizers are multiplied by a weighting factor before summation. A decision is made on this output. A separate error signal is generated for each equalizer by computing the difference between the final decision and the output of each equalizer. This forms an open looped system with no feedback. The equalizers are made adaptive by use of the stochastic gradient algorithm. Results for the structures are presented which differ from those obtained by P. Monsen (1981) for a troposcatter diversity system. The difference is due to the different channel characteristics for which his work was done
Keywords :
diversity reception; equalisers; errors; modems; radiowave propagation; signal processing; telecommunication channels; automatic gain control circuit; channel characteristics; diversity receiver; equalisers; error signal; modem simulation; serial HF modem; troposcatter diversity system; weighting coefficients; Delay lines; Diversity reception; Equalizers; Error correction; Gain control; Hafnium; Modems; Nonlinear filters; Signal generators; Signal to noise ratio;
Conference_Titel :
Communications and Signal Processing, 1988. Proceedings., COMSIG 88. Southern African Conference on
Conference_Location :
Pretoria
Print_ISBN :
0-87942-709-4
DOI :
10.1109/COMSIG.1988.49309
