Title :
A packet reservation multiple access assisted cordless telecommunication scheme
Author :
Hanzo, Lajos ; Cheung, Joseph C S ; Steele, Raymond ; Webb, William T.
Author_Institution :
Dept. of Electron. & Comput. Sci., Southampton Univ., UK
fDate :
5/1/1994 12:00:00 AM
Abstract :
A packet reservation multiple access (PRMA) assisted microcellular cordless telecommunications (CT) system is investigated for office type environments in absence of cochannel interference. The objective speech quality is found as a function of channel signal-to-noise ratio (SNR) for transmissions over narrowband Rayleigh fading channels, parameterized with the number of PRA users. A moderate complexity 16-ary CT scheme constituted by a 4-bit/symbol 32-kbps adaptive differential pulse code modulation (ADPCM) speech codec, Reed-Solomon forward error correction (FEC) codec, and 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 a mobile speed of 2 mi/h if the signal-to-interference ratio (SIR) is above 30 dB
Keywords :
Reed-Solomon codes; amplitude modulation; cellular radio; codecs; cordless telephone systems; fading; multi-access systems; protocols; pulse-code modulation; speech intelligibility; telecommunication channels; 16-StQAM; 16-level star quadrature amplitude modulation; 25 dB; 32 kbit/s; ADPCM; FEC codec; PRMA; Reed-Solomon forward error correction; SIR; SNR; adaptive differential pulse code modulation; channel signal-to-noise ratio; microcellular cordless telecommunications; mobile speed; modem; narrowband Rayleigh fading channels; objective speech quality; office type environments; packet reservation multiple access; signal-to-interference ratio; speech codec; Amplitude modulation; Fading; Forward error correction; Interchannel interference; Modulation coding; Narrowband; Pulse modulation; Quadrature amplitude modulation; Signal to noise ratio; Speech;
Journal_Title :
Vehicular Technology, IEEE Transactions on
