MSE TRACKING PERFORMANCE OF DS SS CODE TRACKING SCHEME USING AN FIR ADAPTIVE FILTER/

The authors investigate the mean-square error (MSE) tracking performan ce of a DS/SS code tracking system based on an adaptive filtering tech nique originally proposed in [I]. The ability of this scheme to track a fast linearly changing delay and delay changing in a random walk mod el is presented. It is shown that the proposed scheme outperforms the maximum likelihood estimator (MLE) by similar to 4dB. Also, the MSE re sults indicate that a filter with small number of laps is recommended during tracking. This supports the conclusions made in [1] which was b ased on the mean hold in time performance of the system.