Multicode chip-interleaved DS-CDMA to effect synchronous correlation of spreading codes in quasi-synchronous transmission over multipath channels

The performance of conventional DS-CDMA systems is greatly affected by asynchronous or multipath propagation. We show that, with a certain way of multicode assignment, chip-interleaved DS-CDMA (CIDS-CDMA) can perform better in such a condition thanks to its ability to preserve the synchronous correlations among the spreading codes. Compared to the recently proposed chip-interleaved block-spread CDMA (CIBS-CDMA) that requires a single-user equalizer, the presented scheme can attain better or comparable performance in channel-coded transmission with a rake receiver that has lower complexity

[1]  Dimitris A. Pados,et al.  New bounds on the total squared correlation and optimum design of DS-CDMA binary signature sets , 2003, IEEE Trans. Commun..

[2]  M. Pursley,et al.  Performance Evaluation for Phase-Coded Spread-Spectrum Multiple-Access Communication - Part I: System Analysis , 1977, IEEE Transactions on Communications.

[3]  Georgios B. Giannakis,et al.  Chip-interleaved block-spread code division multiple access , 2002, IEEE Trans. Commun..

[4]  Alain Glavieux,et al.  Turbo-detection: a new approach to combat channel frequency selectivity , 1997, Proceedings of ICC'97 - International Conference on Communications.

[5]  Shahid U. H. Qureshi,et al.  Reduced-state sequence estimation for coded modulation of intersymbol interference channels , 1989, IEEE J. Sel. Areas Commun..

[6]  Yu-Nan Lin,et al.  A chip-interleaved synchronous DS-CDMA technique enabling MAI-free and reduced-ISI transmission with low complexity receiving , 2004, IEEE 5th Workshop on Signal Processing Advances in Wireless Communications, 2004..

[7]  Alain Glavieux,et al.  Turbo equalization: adaptive equalization and channel decoding jointly optimized , 2001, IEEE J. Sel. Areas Commun..

[8]  Pentti Leppanen,et al.  Comparison of the performance of some linear spreading code families for asynchronous DS/SSMA systems , 1991, MILCOM 91 - Conference record.

[9]  Fuqin Xiong.  Sequential decoding of convolutional codes in channels with intersymbol interference , 1995, IEEE Trans. Commun..

[10]  Georgios B. Giannakis,et al.  Chip-interleaved block-spread CDMA versus DS-CDMA for cellular downlink: a comparative study , 2004, IEEE Transactions on Wireless Communications.