@article{oai:niigata-u.repo.nii.ac.jp:00001883,
 author = {Takizawa, Ken-ichi and Sasaki, Shigenobu and Muramatsu, Shogo and Zhou, Jie and Kikuchi, Hisakazu},
 issue = {7},
 journal = {IEICE transactions on fundamentals of electronics, communications and computer sciences, IEICE transactions on fundamentals of electronics, communications and computer sciences},
 month = {Jul},
 note = {Upper bounds on the bit error rate (BER) for maximum likelihood (ML) decoding are derived in convolutional coded parallel combinatorial spread spectrum (PC/SS) systems over additive white Gaussian noise (AWGN) channels. PC/SS systems can achieve higher data transmission than conventional multicode SS systems. To make the derivation tractable, we put a uniform interleaver between a convolutional encoder and a PC/SS transmitter. Since the PC/SS transmitter is employed as the "inner encoder," the bounds are obtained in a similar manner of the derivation in serially concatenated codes through a uniform interleaver. Two different error patterns in the PC/SS system are considered in the performance analysis. Numerical results show that the derived BER bounds are sufficiently accurate. It is found that the coded PC/SS systems outperform coded all-code-parallel DS/SS systems under the same data rate conditions if the number of pre-assigned PN codes increases.},
 pages = {1696--1701},
 title = {Performance Bounds in Convolutional Coded Parallel Combinatorial SS Systems},
 volume = {E85-A},
 year = {2002}
}