Title :
Wireless multi-level graphical correspondence
Author :
Yuen, H. ; Hanzo, L.
Author_Institution :
Dept. of Electron. & Comput. Sci., Southampton Univ., UK
Abstract :
An adaptive fixed-length differential chain coding (FL-DCC) scheme is proposed for the transmission of line graphics, which can be re-configured as a lower rate, lower resolution or higher rate, higher resolution source codec. The dual-rate re-configurable FL-DCC codec is embedded in a voice, video multimedia communicator system, which allocates the FL-DCC graphics packets to idle speech packets with the aid of the packet reservation multiple access (PRMA) multiplexer. In a bandwidth of 200 kHz, which is characteristic of the Pan-European GSM system, nine speech, video and graphics multimedia users can be accommodated using bandwidth efficient 16-level quadrature amplitude modulation (16QAM) over benign microcellular channels. In the diversity-aided and automatic repeat request (ARQ) assisted 16QAM mode of operation the multimedia user bandwidth becomes 22.2 kHz and the minimum required channel signal to noise ratio (SNR) over AWGN and Rayleigh channels is about 11 and 15 dB, respectively
Keywords :
Gaussian channels; Rayleigh channels; adaptive codes; automatic repeat request; cellular radio; codecs; image coding; multimedia communication; multiplexing; multiplexing equipment; packet reservation multiple access; quadrature amplitude modulation; visual communication; 11 dB; 15 dB; 16-level quadrature amplitude modulation; 16QAM; 22.2 kHz; AWGN channel; PRMA multiplexer; Pan-European GSM system; Rayleigh channels; SNR; adaptive fixed length differential chain coding; automatic repeat request; bandwidth; diversity aided mode; dual rate reconfigurable FL-DCC codec; graphics packets; line graphics transmission; microcellular channels; packet reservation multiple access; signal to noise ratio; source codec; speech packets; video multimedia communicator system; voice communicator system; wireless multilevel graphical correspondence; AWGN; Automatic repeat request; Bandwidth; GSM; Graphics; Multimedia communication; Multimedia systems; Multiplexing; Signal to noise ratio; Speech codecs;
Conference_Titel :
Universal Personal Communications. 1995. Record., 1995 Fourth IEEE International Conference on
Conference_Location :
Tokyo
Print_ISBN :
0-7803-2955-4
DOI :
10.1109/ICUPC.1995.496851
