Title :
A-Performance-Improved-Iterative-Channel-Code-Decoder-For-High-Order-Modulation-Signals-
Author_Institution :
Networks, Motorola Inc., IL
Abstract :
A method of log-likelihood ratio (LLR) generation for input to channel code decoder is presented in this paper. It will be demonstrated that, in a communication system where iterative channel decoding, namely turbo and low density parity check (LDPC) codes, and high order modulations, such as 8PSK, 16QAM and 64QAM, are used, the input to channel code decoder can be iteratively updated by using intermediate results of the decoder for better performance. This technique is applicable to 3G wireless systems, for example 3GPP and 3GPP2, and WiMax (IEEE 802.16)
Keywords :
channel coding; iterative decoding; modulation coding; parity check codes; phase shift keying; quadrature amplitude modulation; turbo codes; 3G wireless systems; 3GPP2; IEEE 802.16; LDPC codes; PSK; QAM; WiMax; high order modulation signals; iterative channel code decoder; log-likelihood ratio generation; low density parity check codes; turbo codes; Computational complexity; Iterative algorithms; Iterative decoding; Land mobile radio; Maximum likelihood decoding; Mobile computing; Modulation coding; Parity check codes; Turbo codes; WiMAX;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2006 IEEE 17th International Symposium on
Conference_Location :
Helsinki
Print_ISBN :
1-4244-0329-4
Electronic_ISBN :
1-4244-0330-8
DOI :
10.1109/PIMRC.2006.254402
