Abstract
This article presents the results of a study on the noise immunity of satellite DVB channels. Dependencies which determine the error probability at the decoder output are presented taking into consideration the parameters of the used RS, convolutional, BCH and LDPC codes and the error probability at the decoder input. Research of the influence of the packet length, constraint length and code rate on the BER characteristics of Reed-Solomon and convolutional decoder is conducted. The values of the parameters under research, at which the highest code effectiveness is achieved, are determined following an analysis of the results. Investigations have been carried out to determine the influence of the BCH packets length, the BCH code rate, the parameters of LDPC parity-check matrix and the number of iteration in the LDPC decoder on the radio channel noise immunity. BER characteristics of satellite DVB channels are presented upon using concatenated RS-convolutional and BCH-LDPC codes with optimised parameters and are compared to the standard ones for such systems.
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