Title :
Performance of PRMA schemes via fading channels
Author :
Hanzo, L. ; Cheung, J.C.S. ; Steele, R. ; Webb, W.T.
Author_Institution :
Dept. of Electron. & Comput. Sci., Southampton Univ., UK
Abstract :
A packet reservation multiple access (PRMA) assisted microcellular cordless telecommunications (CT) system is investigated for office type environments. The objective speech quality is found as a function of channel signal-to-noise ratio (SNR) for transmissions over narrowband Rayleigh fading channels, parametrized with the number of PRMA users. A moderate-complexity 16-ary CT scheme comprising a 4-b/symbol 32-kb/s adaptive differential pulse code modulation (ADPCM) speech codec, a Reed-Solomon forward error correction (FEC) codec, and a diversity-assisted 16-level star quadrature amplitude modulation (16-StQAM) modem is proposed. The 264-kBd 20-slot PRMA scheme supports 36 users while maintaining virtually imperceptible speech degradation for channel SNRs in excess of about 25 dB and for mobile speeds above 2 mph
Keywords :
Rayleigh channels; Reed-Solomon codes; access protocols; cellular radio; cordless telephone systems; differential pulse code modulation; diversity reception; error correction codes; fading; forward error correction; land mobile radio; office environment; packet radio networks; packet reservation multiple access; quadrature amplitude modulation; speech codecs; 32 kbit/s; ADPCM; PRMA schemes; Reed-Solomon forward error correction; adaptive differential pulse code modulation; diversity-assisted 16-level star quadrature amplitude modulation; microcellular cordless telecommunications; narrowband Rayleigh fading channels; objective speech quality; office type environments; packet reservation multiple access; speech codec; speech degradation; Amplitude modulation; Fading; Forward error correction; Modulation coding; Narrowband; Pulse modulation; Quadrature amplitude modulation; Reed-Solomon codes; Signal to noise ratio; Speech codecs;
Conference_Titel :
Vehicular Technology Conference, 1993., 43rd IEEE
Conference_Location :
Secaucus, NJ
Print_ISBN :
0-7803-1267-8
DOI :
10.1109/VETEC.1993.510959
