Title :
LDPC Coded Irregular Modulation Based on Degree Distribution
Author :
Jia Minli ; He Zunwen ; Kuang Jingming ; Fei Zesong
Author_Institution :
Dept. of Electron. Eng., Beijing Inst. of Technol., Beijing
Abstract :
A novel irregular low density parity check (LDPC) coded link adaptation technique is presented to achieve flexible spectral efficiency and various reliabilities with irregular modulation. The mapping rule between LDPC coded bits and signal constellations is optimized in terms of LDPC code degree distribution and inherent unequal error protection property of irregular modulation. Simulation results show that the combination of various modulations can achieve not only fine data rate adaptation, but also better bit error rate (BER) performance with optimized mapping rule. Convergence performance is also analyzed using extrinsic information transfer (EXIT) chart based on actual probability dense function of extrinsic information by Monte Carlo simulations.
Keywords :
Monte Carlo methods; error statistics; modulation; parity check codes; telecommunication network reliability; BER performance; LDPC code degree distribution; LDPC coded irregular modulation; Monte Carlo simulations; actual probability dense function; bit error rate; data rate adaptation; extrinsic information transfer chart; inherent unequal error protection property; low density parity check code; mapping rule; Bit error rate; Constellation diagram; Convergence; Decoding; Modulation coding; Parity check codes; Reliability engineering; Robustness; Signal mapping; Turbo codes;
Conference_Titel :
Wireless Communications, Networking and Mobile Computing, 2007. WiCom 2007. International Conference on
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-1311-9
DOI :
10.1109/WICOM.2007.225