A novel implitation of reverse link acquisition

Abstract

A simple and economic scheme for coarse code acquisition of reverse link for UMTS (FDD-WCDMA) application is presented. The acquisition performance is evaluated in terms of probability of false detection (pf) in a multiple cell and multipath fading operating environment. The large timing uncertainties region of acquisition in the presence of fading channel and multiple access interference may impose a significant limitation on system capacity. Knowledge of initial code uncertainty phases help to reduce the overhead of the preamble on the access channel and a very simple scheme for acquisition to be determined. In the reverse link this uncertainty is due to the cell radius only. Acquisition time required for a simple serial search scheme may therefore be unacceptably large. On the other hand, for parallel acquisition using parallel branches in accordance with the chip uncertainty time region leads to a lot of hardware complexity. We propose a very simple architecture to find real phase easily. Numerical results based on analysis of acquisition performance in the presence of multiple access interference and fading environment with multipath products are employed to show that the proposed acquisition scheme is efficient robust, fast and suitable for real time low cost implementation.