High gain channel coding for satellite communication system

The main aim of this work is to find a way to replace the current coding scheme implemented on AlSat-2; the second earth observation Algerian Microsatellite (2.5 m of resolution), to be implemented on the future high resolution earth observation Algerian Microsatellite, by the discovered Turbo Codes. This paper describes the performance of the Turbo Code - Binary Phase Shift Keying (BPSK) Modem which was designed at the Centre of Satellite Development (CDS). This proof-of-concept modem is the outcome of a research and development (R&D) project entitled “Design of a smart adaptive communication system for the future satellite communication systems”. The major technical contribution of this work is the new interleaver design using chaotic sequences to produce the dither in the golden interleaver. We compare the performance of Turbo codes for different interleaver sizes and a number of iteration equal to five with the performance of the industry standard rate 1/2, constraint length (K) seven, convolutional code. As example and for practical considerations, the interleaver length is fixed to be equal to 1024. To achieve a bit error rate (BER) of 10^-5, a gain of about 3dB is reached when we replace the current scheme (convolutional encoder) with the suggested Turbo encoder.