@article{oai:niigata-u.repo.nii.ac.jp:00001889,
 author = {Takizawa, Ken-ichi and Sasaki, Shigenobu and Muramatsu, Shogo and Kikuchi, Hisakazu},
 issue = {12},
 journal = {IEICE transactions on fundamentals of electronics, communications and computer sciences, IEICE transactions on fundamentals of electronics, communications and computer sciences},
 month = {Dec},
 note = {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.},
 pages = {2991--2999},
 title = {Iterative Demodulation and Decoding for Parallel Combinatotial SS Systems},
 volume = {E84-A},
 year = {2001}
}