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Quasi-Walsh PN sequences and their applications in robust CDMA communication systems

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2 Author(s)
Giardina, C. ; AT&T Bell Labs., Whippany, NJ, USA ; Rudrapatna, A.N.

Systems of quasi-Walsh functions are developed which simultaneously enable multiple access as well as secure communication and jamming resistance. In this system, a pseudo random sequence of diagonal isometries post multiplies a Hadamard matrix, thereby generating the orthogonal direct spreading sequences. Minimal mutual interference is a consequence of the resulting orthogonal spreading. Utilizing bit-by-bit distinct orthogonal codes gives the added benefit of high signal hiding capability and jamming resistance. An encoding scheme is presented which uniquely determines the actual quasi-Walsh system in use

Published in:

Personal Wireless Communications, 2000 IEEE International Conference on

Date of Conference:

2000

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