Evaluation of low density parity check codes over various channel types

Abstract EN

Low density parity check (LDPC) codes are one of the best error correcting codes in today’s coding world and are known to approach the Shannon limit.

As with all other channel coding schemes, LDPC codes add redundancy to the uncoded input data to make it more immune to channel impairments.

In this paper, the impact of low-Density Parity-Check code (LDPC) on the performance of system under Binary Phase Shift keying (BPSK) over an Additive White Gaussian Noise (AWGN) and other fading (Raleigh and Rician) channels is investigated.

Obtained results show that LDPC can improve transceiver system for various channel types.

At Bit Error Rate (BER) of 10-4 such code with code rate of ½ reduces the Signal to Noise Ratio (SNR) by range of 6.5 to 9 dB for fading channels in contrast to uncoded system.

By studying modern research it has been found that turbo code can achieved same manner but LDPC decoder faster than turbo decoder and can be implemented in parallel.