Title :
A novel efficient soft output demodulation algorithm for high order modulation
Author :
Gu, Xinyu ; Niu, Kai ; Wu, Weiling
Author_Institution :
Sch. of Inf. Eng., Beijing Univ. of Posts & Telecommun., China
Abstract :
Combining Turbo-codes and high order modulation is a simple but effective way to improve the bandwidth efficiency. Since the Turbo decoder requires binary soft decisions as the input information, the demodulator has to provide bit level soft information (LLR) to it. In this paper, a novel simplified algorithm to calculate LLR is developed, which will remarkably reduce the computational complexity, and has nearly no performance loss.
Keywords :
binary codes; computational complexity; decoding; electronic engineering computing; modulation coding; telecommunication computing; turbo codes; LLR calculation; Turbo codes; Turbo decoder; bandwidth efficiency; binary soft decisions; bit level soft information; computational complexity; high order modulation; performance loss; soft output demodulation algorithm; Bandwidth; Computational complexity; Computational modeling; Decoding; Demodulation; Downlink; Multiaccess communication; Performance loss; Roentgenium; Turbo codes;
Conference_Titel :
Computer and Information Technology, 2004. CIT '04. The Fourth International Conference on
Print_ISBN :
0-7695-2216-5
DOI :
10.1109/CIT.2004.1357243
