help: I need some books about spread spectrum systems.

I want to work on a spread spectrum system and I need books or papers about these topic.
If you know any site that contains downloadable e-books about spread spectrum please tell me.
thank you very much.

U may search in the EDA E-books Upload/Download forum, https://www.edaboard.com/forum68.html

hi
you can download this book.i think it is very good book.
follow this link
https://www.edaboard.com/viewtopic.p...pread+spectrum
these are some good books in this field:
Principles of Spread-Spectrum Communication Systems -- by Don Torrieri
CDMA : Principles of Spread Spectrum Communication (Addison-Wesley Wireless Communications) -- by Andrew J. Viterbi
Introduction to Spread Spectrum Communications -- by Rodger E. Ziemer