Title :
Iterative demodulation and decoding for parallel combinatorial SS systems
Author :
Takizawa, Ken-Ichi ; Sasaki, Shigenobu ; ZHou, Jie ; Muramatsu, Shogo ; Kikuchi, Hisakazu
Author_Institution :
Dept. of Electr. & Electron. Eng., Nagaoka Univ. of Technol., Niigata, Japan
fDate :
6/23/1905 12:00:00 AM
Abstract :
This paper proposes iterative demodulation/decoding for parallel combinatorial spread spectrum (PC/SS) systems. The PC/SS systems convey the information data by a combination of pre-assigned spreading sequences with polarity. Convolutional coding with a random interleaver is implemented as channel coding, like serial concatenated coding. A ´soft-in/soft-out´ PC/SS demodulator, based on an a posteriori probability algorithm, is proposed to perform the iterative demodulation and decoding. Simulation results demonstrate that the proposed iterative demodulation and decoding bring significant improvement in the bit error rate performance
Keywords :
block codes; channel coding; code division multiple access; concatenated codes; convolutional codes; demodulation; error statistics; interleaved codes; iterative decoding; probability; radio links; spread spectrum communication; CDMA; a posteriori probability; bit error rate; block coding; channel coding; concatenated coding; convolutional coding; iterative decoding; iterative demodulation; parallel combinatorial spread spectrum systems; random interleaver; soft-in soft-out decoder; Bit error rate; Concatenated codes; Convolution; Convolutional codes; Demodulation; Forward error correction; Iterative algorithms; Iterative decoding; Multiaccess communication; Spread spectrum communication;
Conference_Titel :
Global Telecommunications Conference, 2001. GLOBECOM '01. IEEE
Print_ISBN :
0-7803-7206-9
DOI :
10.1109/GLOCOM.2001.965531
