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On Pseudo-Random and Orthogonal Binary Spreading Sequences

Authors: Abhijit Mitra


Different pseudo-random or pseudo-noise (PN) as well as orthogonal sequences that can be used as spreading codes for code division multiple access (CDMA) cellular networks or can be used for encrypting speech signals to reduce the residual intelligence are investigated. We briefly review the theoretical background for direct sequence CDMA systems and describe the main characteristics of the maximal length, Gold, Barker, and Kasami sequences. We also discuss about variable- and fixed-length orthogonal codes like Walsh- Hadamard codes. The equivalence of PN and orthogonal codes are also derived. Finally, a new PN sequence is proposed which is shown to have certain better properties than the existing codes.

Keywords: Gold, autocorrelation, code division multiple access, Kasami, pseudo-noise codes, Barker, Walsh-Hadamard, crosscorrelation, figure of merit, maximal length

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