Title :
A normalized LLR soft information demapping method in DTMB system
Author :
Song, Linqi ; Wang, Jun ; Pan, Changyong ; Fu, Jian
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
This paper presents a normalized demapping method with application to the digital terrestrial multimedia broadcasting (DTMB) system. Normalized logarithm likelihood ratio (NLLR) soft information is computed using this new method in which a normalization factor is proposed. Two ways of determining this factor are illustrated and simulation results show that it performs well with comparison to other factors under 16QAM constellation in additive white gaussian noise (AWGN) and fading channels respectively.
Keywords :
digital television; iterative decoding; multimedia communication; parity check codes; statistical distributions; television broadcasting; LDPC iterative decoding; digital television broadcasting standard; digital terrestrial multimedia broadcasting system; logarithm likelihood ratio; normalization factor; normalized LLR soft information demapping method; statistical method; AWGN; Computational modeling; Concatenated codes; Forward error correction; Iterative decoding; Laboratories; Modulation coding; Parity check codes; Signal processing; Transmitters;
Conference_Titel :
Communication Systems, 2008. ICCS 2008. 11th IEEE Singapore International Conference on
Conference_Location :
Guangzhou
Print_ISBN :
978-1-4244-2423-8
Electronic_ISBN :
978-1-4244-2424-5
DOI :
10.1109/ICCS.2008.4737392
