Title :
RS codes: An attractive choice for low bit rate speech transmission in PCS
Author :
Atungsiri, S.A. ; Kondoz, A.M. ; Evans, B.G.
Abstract :
Differential coherent 8-DPSK, 16-DSPK and 8/8-DAPSK modulation schemes have been investigated for use in a frequency-hopping code division multiple access system. For this purpose, a Rayleigh and Ricean fading model for the frequency hopping system has been developed. A FH system which uses these modulation schemes and Reed-Solomon (RS) codes as forward error correction in the presence of Rayleigh and Rician fading channels has been simulated. A pilot symbol has been used at the beginning of each frequency hop slot in order to overcome the phase ambiguity caused by fading and as a result of hopping the carrier frequency. Block interleaving also been also used and simulated in the system. A performance comparison for the above system which uses each of the modulation schemes is presented for the cases with and without block interleaving.<>
Keywords :
Reed-Solomon codes; code division multiple access; fading; frequency agility; phase shift keying; radio systems; telecommunication channels; 16-DSPK; 8/8-DAPSK; M-ary modulation; Rayleigh fading channel; Rayleigh fading model; Reed Solomon codes; Ricean fading model; Rician fading channels; block interleaving; carrier frequency; code division multiple access; differential coherent 8-DPSK; forward error correction; frequency hop slot; frequency-hopping system; performance comparison; phase ambiguity; pilot symbol; Code division multiaccess; Communication channels; Fading channels; Phase shift keying; Reed-Solomon codes;
Conference_Titel :
Advanced Modulation and Channel Coding Techniques for Mobile and Personal Communications, IEE Colloquium on
Conference_Location :
London, UK
