Adaptive Subsample Time Delay Estimation for Narrowband Signal Synchronisation

This paper addresses the problem of subsample or fractional sample time delay estimation of narrowband signals of known centre frequency, in order to synchronise the signals. The Lagrange interpolator filter is incorporated into the explicit time delay estimator (ETDE) method. In order to achieve this, a new form of the Lagrange interpolator is presented in this paper. Further modifications are made to the ETDE algorithm. Simulations show delay estimation bias using the new algorithm is orders of magnitude smaller than conventional “sinc”-based ETDE.