Abstract

This paper describes a novel type of code division multiple access (CDMA) system, two-layer spreading CDMA (TLS-CDMA). It can combat multiple access interference (MAI) and multipath interference (MPI) efficiently over frequency selective fading channels. Moreover, a two-layer cell-specific scrambling code is proposed for the TLS-CDMA system in the uplink transmission to suppress other-cell interference (OCI). The proposed TLS-CDMA system enables the spreading factor to be adapted to the cell structure and channel propagation conditions to support variable data rate transmission among multiple pseudo-synchronous users. The simulation results show the superior of the proposed TLS-CDMA system over the existed uplink transmission systems.

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