A high spectrum efficient multiple access code

Abstract

A new class of high spectrum efficient multiple access codes and its modifications are presented. These codes have some nice properties such that: (1) the sidelobes of their non-cyclic auto-correlations and cross-correlations can be simultaneously controlled to their minimum value +1 or -1. (2) For any auto-correlation or cross-correlation, from the main lobe (origin) to the 1st sidelobe, there exists a "zero correlation window" and the window width can also be controlled. The construction method of such a class of multiple access codes is presented. The application of such codes to a high data rate CDMA system with a much higher capacity than IS-95 is also discussed.