Title :
Performance prediction of GSM digital cellular speech and image transmission
Author :
Quincy, E.A. ; Achatz, R.J.
Author_Institution :
Inst. for Telecommun. Sci., US Dept. of Commerce, Boulder, CO, USA
Abstract :
The Group Special Mobile (GSM) digital cellular system provides the European countries with a standard land mobile radio (LMR) architecture. This paper illustrates how voice coded (vocoded) speech and uncompressed image transmission can be expected to degrade as a function of signal to noise ratio (SNR) and carrier to interference ratio (CIR) for a cochannel GSM interferer. Performance is predicted by Monte Carlo simulation of the system. This simulated GSM system employed (1) a Gaussian minimum shift keying (GMSK) modem with convolutional coding and Viterbi decoding, (2) a five-path urban channel impulse response with additive white Gaussian noise (AWGN), (3) a minimum mean square error (MMSE) equalizer, and (4) limiter-discriminator detection. These results demonstrate that GSM systems in an urban environment can transport useable speech and images without packet retransmission provided the SNR⩾8 dB and CIR⩾8 dB
Keywords :
Gaussian channels; Monte Carlo methods; Viterbi decoding; cellular radio; cochannel interference; convolutional codes; digital radio; discriminators; equalisers; image coding; land mobile radio; minimum shift keying; radiofrequency interference; speech coding; transient response; vocoders; GSM digital cellular system; Gaussian minimum shift keying modem; Monte Carlo simulation; Viterbi decoding; additive white Gaussian noise; carrier to interference ratio; cochannel GSM interferer; convolutional coding; five-path urban channel impulse response; limiter-discriminator detection; minimum mean square error equaliser; packet retransmission; performance prediction; signal to noise ratio; speech transmission; standard land mobile radio architecture; uncompressed image transmission; urban environment; voice coded speech; AWGN; Convolutional codes; Degradation; GSM; Image communication; Interference; Land mobile radio; Modems; Signal to noise ratio; Speech enhancement;
Conference_Titel :
Communications, Computers, and Signal Processing, 1995. Proceedings., IEEE Pacific Rim Conference on
Conference_Location :
Victoria, BC
Print_ISBN :
0-7803-2553-2
DOI :
10.1109/PACRIM.1995.519402
