engleski

Simulation Model of DVB-S2 System

This paper presents simulation model of the DVB-S2 (Digital Video Broadcasting - Satellite - Second Generation) system implemented in Simulink, Matlab. The model provides simulation of the DVB- S2 system parameters in AWGN (Additive White Gaussian Noise) channel. The aim of this model is to propose optimal DVB-S2 parameters in different propagation conditions. The simulation offers two modulation scheme options QPSK (Quadrature Phase Shift Keying) and 8PSK (8 Phase Shift Keying) with different code ratio values. During the simulation, BER (bit error rate) and PER (packet error rate) are calculated and the constellation diagram is observed. Simulation results, obtained by using two test images with different texture, showed that QPSK modulation is more robust compared to 8PSK modulation in the same propagation conditions. Simulink model results were compared with measurements of several Astra 1 satellite (19, 2° E) transponders parameters. Lab- measured values achieved higher SNR values than simulation cases because of real wireless channel conditions. Optimal operation parameters for a DVB-S2 system according to channel conditions and the required bit rate are proposed.

DVB-S2; FEC; Code Rate; Modulation; LDPC code; PER; BER

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