Title :
A precise approach for computing channel soft information
Author :
Qian, BeiBei ; Yao, Dongping ; Xiong, Lei
Author_Institution :
State Key Lab. of Rail Traffic Control & Safety, Beijing Jiaotong Univ., Beijing, China
Abstract :
LDPC (low-density parity-check) codes have a good performance close to the Shannon limit. To make full error-correcting performance, soft information is used in iterative decoding algorithm. For different types of modulation, there are different expressions of channel soft information. In this paper, we propose approaches for computing channel soft information precisely for BPSK, QPSK, 16QAM, instead of approximation. Taking the example of CMMB standard, simulation of channel coding with channel soft information is done.
Keywords :
channel coding; error correction codes; iterative decoding; parity check codes; quadrature amplitude modulation; quadrature phase shift keying; BPSK; CMMB standard; LDPC; QAM; QPSK; Shannon limit; channel coding; channel soft information computing; error correcting performance; iterative decoding; low-density parity-check codes; AWGN channels; Binary phase shift keying; Constellation diagram; Decoding; Laboratories; Parity check codes; Quadrature phase shift keying; Rails; Railway safety; Traffic control; CMMB; LDPC; channel soft information;
Conference_Titel :
Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, 2009 3rd IEEE International Symposium on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-4076-4
DOI :
10.1109/MAPE.2009.5355835
