Performance Analysis of Concatenated LDPC Codes for Video Broadcast Satellite System

摘要

For the emerging digital video broadcast applications of satellite communication system, there is a demand to achieve the low bit error rate, reduced receiver end processing delay with high data rate transmission. Advance forward error correction techniques such as LDPC codes, Turbo codes and BCH codes can be employed to achieve this. LDPC code provides the high throughput, high data rate, improved coding gain and low complexity. It provides a coding gain of 5.12 dB at 3.1×10~(-3) bit error rate in comparison with convolution code over fading environment however LDPC codes give flat error performance beyond a certain value of SNR, known as error floor region. To improve this, LDPC codes along with BCH code are used for emerging application of satellite communication e. g. digital video broadcast satellite/terrestrial (DVB-S2/T2). Present paper analyzes the performance of forward error correction subsystem (BCH code along with LDPC code) in video broadcast satellite system.