Performance analysis of low density parity check codes implemented in second generations of digital video broadcasting standards

The newly developed second generations standards for digital video broadcasting (DVB-T2, DVB-S2) emerges as a significant upgrade over its first generation predecessor. Low-Density Parity-Check (LDPC) codes received a lot of attention by their superb error-correcting capability and have been adopted as main error correct coding scheme by second generation Digital Video Broadcasting standards. The goal of this paper is to present the main constructive principle of low-density parity check codes, as well as a design methodology, that gives good performance for many communication systems like latest DVB satellite communications standard. In this paper we analyze the structure of LDPC codes and the iterative algorithms that are used to decode them. An analysis and simulation of the LDPC codes has been conducted using various code rates. The simulation results show that LDPC codes are a powerful error correcting coding technique under SNR environments. It has achieved near Shannon capacity. However, there are many factors needed to be considered in the LDPC code design.