Title :
A mobile speech, video and data transceiver scheme
Author :
Hanzo, L. ; Stedman, R. ; Steele, R. ; Cheung, J.C.S.
Author_Institution :
Dept. of Electron. & Comput. Sci., Southampton Univ., UK
Abstract :
The complexity robustness, image and speech quality as well as packet multiplexing issues of a re-configurable multi-media mobile communicator are addressed. The proposed moderate complexity motion-compensated discrete cosine transform (DCT) based image communicator provides an image peak signal-to-noise ratio (PSNR) of 38 dB at an average bit rate of about 25 kbits/s. The speech codec used is a low-complexity 32 kbit/s CCITT G721 standard scheme. Bandwidth efficient 16 or 64-level quadrature amplitude modulation (QAM) combined with embedded low-complexity binary Bose-Chaudhuri-Hocquenghem (BCH) forward error correction (FEC) coding is deployed. The 2O-slot packet reservation multiple access (PRMA) scheme used supports an extra 2.4 kbit/s low-rate data channel for each speech user, in addition to providing 5-6 videophone channels. The ADPCM/DCT/BCH/16-QAM and ADPCM/DCT/BCH/64-QAM schemes provide nearly unimpaired speech and image quality for channel SNRs in excess of 30 dB and 38 dB, respectively
Keywords :
BCH codes; data communication equipment; differential pulse code modulation; discrete cosine transforms; error correction codes; land mobile radio; motion compensation; multimedia communication; multiplexing; packet reservation multiple access; quadrature amplitude modulation; speech codecs; telecommunication terminals; transceivers; video equipment; 16QAM; 2.4 kbit/s; 25 kbit/s; 30 dB; 32 kbit/s; 38 dB; 64QAM; ADPCM; CCITT G721 standard; PRMA; average bit rate; binary BCH code; data transceiver; forward error correction; image communicator; image quality; low-rate data channel; mobile speech transceiver; motion-compensated DCT; multimedia mobile communicator; packet multiplexing; packet reservation multiple access; peak signal-to-noise ratio; quadrature amplitude modulation; speech codec; speech quality; video transceiver; Bit rate; Code standards; Discrete cosine transforms; Forward error correction; Multimedia communication; PSNR; Quadrature amplitude modulation; Robustness; Speech codecs; Transceivers;
Conference_Titel :
Vehicular Technology Conference, 1994 IEEE 44th
Conference_Location :
Stockholm
Print_ISBN :
0-7803-1927-3
DOI :
10.1109/VETEC.1994.345087
