Design and Analysis of Low-rate Codes
October 29, 2007
NEC Research Laboratories
Monday, October 29, 2:00PM
Stevens Institute of Technology
We consider the design and analysis of low-rate codes, generalized low-density parity-check (GLDPC) codes and the variations, repeat-zigzag-Hadamard (RZH) codes, in AWGN channels. The code ensembles of GLDPC and RZH codes can be optimized using Extrinsic information transfer (EXIT) charts. The simulation results show that a rate-0.003 LDPC-Hadamard code built from designed code ensemble with large block length performs only 0.15 dB away from the ultimate Shannon limit (-1.592 dB). Those low-rate codes are the promising candidates for the channel coding in the applications of sensor network, ultra-wideband communications and code-spread CDMA systems.