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oai:niigata-u.repo.nii.ac.jp:00001889
2022-12-15T03:34:43Z
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Iterative Demodulation and Decoding for Parallel Combinatotial SS Systems
Iterative Demodulation and Decoding for Parallel Combinatotial SS Systems
Takizawa, Ken-ichi
Sasaki, Shigenobu
Muramatsu, Shogo
Kikuchi, Hisakazu
copyright©2001 IEICE(許諾番号07RB0183)
spread spectrum
multi-code CDMA
iterative decoding
channel coding
This paper proposes iterative demodulation/decoding for parallel combinatorial spread spectrum(PC/SS)systems. A PC/SS system conveys information data by a combination of pre-assigned orthogonal spreading sequences with polarity. In this paper, convolutional coding with a uniform random interleaver is implemented in channel coding, just like as a serial concatenated coding. A 'soft-in/soft-out' PC/SS demodulator based on a posteriori probability algorithm is proposed to perform the iterative demodulation and decoding. Simulation results demonstrate that the proposed iterative demodulation/decoding scheme bring significant improvement in bit error rate performance. This proposed decoding scheme achieves highspeed transmission by two approaches. One is a puncturing operation, and the other is to increase the number of transmitting sequences. In the latter approach, lower error rate performance is achieved comparing with that the punctured convolutional code is used to increase the information bit rate.
The Institute of Electronics, Information and Communication Engineers
2001-12
eng
journal article
http://hdl.handle.net/10191/6214
https://niigata-u.repo.nii.ac.jp/records/1889
http://www.ieice.org/jpn/trans_online/
AA10826239
09168508
IEICE transactions on fundamentals of electronics, communications and computer sciences
IEICE transactions on fundamentals of electronics, communications and computer sciences
E84-A
12
2991
2999
https://niigata-u.repo.nii.ac.jp/record/1889/files/1_0020.pdf
application/pdf
1.0 MB
2019-07-29