Title :
Effects of PRMA on objective speech quality
Author :
Hanzo, Lajos ; Webb, W.T. ; Steele, R.
Abstract :
When transmitting 32 kbit/s adaptive differential pulse code modulation (ADPCM) speech using Reed-Solomon error correction coding and 16 level quadrature amplitude modulation (16-QAM), a 20 slot packet reservation multiple access (PRMA) assisted cordless telecommunications (CT) scheme supported 36-38 speech users with negligible objective and subjective speech degradation. The average number of users per slot was nearly doubled due to deploying PRMA and toll quality speech was transmitted in a user bandwidth approximately 11.6 kHz. For a channel signal-to-noise ratio (SNR) in excess of 25 dB, a Rayleigh fading channel and mobile speeds above 2 mph the speech segmental SNR degradation was less than 0.3 dB.
Keywords :
Reed-Solomon codes; amplitude modulation; cordless telephone systems; digital radio systems; multi-access systems; pulse-code modulation; speech coding; speech intelligibility; 11.6 kHz; 16 level quadrature amplitude modulation; 32 kbit/s; ADPCM speech transmission; PRMA; Rayleigh fading channel; Reed-Solomon error correction coding; channel signal-to-noise ratio; cordless telecommunications; objective speech quality; packet reservation multiple access; speech segmental SNR degradation; toll quality speech; user bandwidth;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19930102
