Asynchronous Oversaturated Group Orthogonal CDMA Using Chip Interleaving with Zero Padding

In this article we consider usage of chip interleaving with zero padding in oversaturated systems. It is shown that this approach makes user signals at the receiving end bit-synchronous independently of the user delay profile, making thus chip group orthogonal (GO-CDMA) applicable in asynchronous transmission conditions as well. Theoretical calculations and computer simulations demonstrate that at high signal to noise ratio (SNR) values the performance of the system is equivalent to the one operating in synchronous channels.