1. Simon M. K., Omura J. K., Scholtz R. A., Levitt B. K. (1994) Spread Spectrum Communications Handbook. McGraw-Hill, NY
2. Vitali, S., & Setti, G. (2006). Improving PA efficiency by Chaos based spreading in MC/DS_CDMA systems. In Proceedings of IEEE international symposium on circuits and systems (ISCAS) (pp. 1195–1198).
3. Kennedy, M. P., Kolumban, G., Kis, G., & Jako, Z. (1998). Recent advances in communicating with chaos. In Proceedings of IEEE international symposium on circuits and systems (pp. 461–464.). CA: Monterey.
4. Bensley S. E., Aazhang B. (1996) Subspace-based channel estimation for code division multiple access communication systems. IEEE Transactions on Communications 44(8): 1009–1020
5. Gaffar M. Y. A., Broadhurst A. D., Takawira F. (2005) Improved subspace-based channel estimation algorithm for DS-CDMA systems exploiting pulse-shaping information. IEEE Communication Proceedings 152(5): 533–540