Title :
16-kbps modem design using vector quantization
Author :
Foster, John ; Harris, Sharon F.
Author_Institution :
Dept. of Electr. Eng., North Carolina A&T State Univ., Greensboro, NC, USA
Abstract :
As compared to traditional modem schemes, vector quantisation (VQ) offers higher transmission rates for a fixed SNR or lower SNR´s for a fixed transmission rate. The initial simulation efforts, written in F77, used the AWGN channel with low dimensions (1-8) and data rates of 1-3 bits/sample or equivalently 8000-24000 bits/second. The research strategy involves the following: (1) upgrading the VQ modem algorithm; (2) channel modeling and computer simulation of higher dimension; (3) system performance simulation; and (4) development of VQ modem system. Simulations of higher dimension sizes (8-16) are written in C programming language and using the VQ modem algorithm with AWGN 3.2 kHz channels, transmission rates of 16 kbps are achievable across `average´ telephone lines. The printed circuit board design of a real-time VQ modem system is being ported onto Mentor Graphics CAD tools on Apollo workstations
Keywords :
analogue-digital conversion; circuit CAD; data compression; digital simulation; modems; 16 kbit/s; AWGN channel; Apollo workstations; Mentor Graphics; PCB design; channel modeling; circuit CAD; computer simulation; modem; real-time; vector quantization; AWGN channels; Circuit simulation; Computational modeling; Computer languages; Computer simulation; Modems; Printed circuits; System performance; Telephony; Vector quantization;
Conference_Titel :
System Theory, 1991. Proceedings., Twenty-Third Southeastern Symposium on
Conference_Location :
Columbia, SC
Print_ISBN :
0-8186-2190-7
DOI :
10.1109/SSST.1991.138502
