Design and Performance Evaluation of Concatenated Coding for Future DVB-S Systems

Abstract

It is imperative to maximize bandwidth efficiency and achieve low probabilities of bit errors over satellite channels which suffer large noise effect. Digital Video Broadcasting (DVB) describes a new coding and modulation schemes based on LDPC codes concatenated with BCH codes allowing a quasierror free operation at about 0.7 dB to 1.0 dB close to Shannon’s limit that permits greater flexibility and more efficient use of bandwidth capacity without significant increase of system complexity. This research intends to test the BCH and LDPC code using Mat Lab simulations and implement the QPSK, 8-PSK and 16-QAM (16-APSK) based digital transmission systems in AWGN with a concatenation of LDPC and BCH codes at standard DVB-S2 code rates of 1/2 and 9/10. Simulations are to be carried out to obtain BERs and other performance measures were carried out and these results were compared with specifications of Shannon’s information capacity theorem.