Title :
Comparison of modulation schemes for a pseudo-ternary 2.048 Mbit/s PCM multiplex signal in rural communications
Author :
de Krom, W.H.C. ; Verlijsdonk, A.P.
Author_Institution :
Div. of Telecommun., Eindhoven Univ. of Technol., Netherlands
Abstract :
In some rural communication systems, BPSK modulation is used for transmission of a pseudo-ternary primary multiplex PCM signal. In general the application of BPSK modulation has been appropriate, since BPSK modulation yields reasonable bandwidth utilization at low system complexity. However, a trellis-coded modulation system with rate R=1/2 convolutional coding and QPSK modulation is found to be superior. This system has a coding gain compared to BPSK modulation of approximately 3.3 dB, assuming ideal QPSK (de)modulation.<>
Keywords :
digital radio systems; encoding; phase shift keying; pulse-code modulation; 2.048 Mbit/s; 3.3 dB; BPSK modulation; QPSK modulation; coding gain; convolutional coding; pseudo-ternary primary multiplex PCM signal; rural communications; trellis-coded modulation system; Amplitude modulation; Bandwidth; Binary phase shift keying; Convolution; Convolutional codes; Costs; Decoding; Modulation coding; Phase change materials; Phase modulation;
Conference_Titel :
Communications, Computers and Signal Processing, 1989. Conference Proceeding., IEEE Pacific Rim Conference on
Conference_Location :
Victoria, BC, Canada
DOI :
10.1109/PACRIM.1989.48384
