Event Details
Performance of Low Density Parity Check Codes in Fading Channels
Presenter: Zabnan Aldossary
Supervisor: Dr. T. Aaron Gulliver
Date: Fri, February 25, 2011
Time: 09:30:00 - 10:30:00
Place: EOW 430
ABSTRACT
Abstract:
Low density parity check (LDPC) codes are near capacity achieving error correcting codes. It has been shown that using a messages passing algorithm, LDPC codes can achieve performance at a signal-to-noise ratio (SNR) close to the Shannon limit on an additive white Gaussian noise (AWGN) channel. The best LDPC codes have been found to be those with a sparse parity check matrix (H matrix).
With the advent of wireless communications, fading of the transmission channels is unavoidable. This project investigates the performance of LDPC codes under Rayleigh fading for different parity check matrix sizes and different numbers of sum-product algorithm (SPA) iterations. The results show the performance difference between AWGN and fading channel for LDPC codes, in particular that fading has a significant effect on code performance. Thus codes should be designed specifically for fading channels.