A new class of spreading sequences

This paper is concerned with the construction and analysis of a new class of spreading sequences. A known pseudonoise sequence and a selection of its cyclic shifts is folded into a new type of array and unfolded along its diagonal. The resulting sequence is equivalent to a decimation of a shuffled ensemble of cyclic shifts of the original pseudonoise sequence. The new sequences form a family comparable in size and figure of merit to that of Gold codes, but available in many different (composite) lengths. They possess enhanced immunity against cryptographic attack, owing to their large linear and nonlinear span. These sequences are well suited to CDMA, especially for microcell applications.