Orthogonal variable rate spreading sequences with improved correlation properties for wireless CDMA cellular networks

This paper discusses a technique for orthogonal multiplexing and scrambling of signals with variable spreading factor in a direct sequence code division multiple access (DS-CDMA) system. The technique extends Gold sequences and yields a bounded autocorrelation and cross correlation for small delays, mostly in the range of interest for microcell multipath channels. Furthermore variable spreading factor multiplexing can readily be implemented similar to those for Hadamard multiplexing