Techniques are provided for fine-tuning estimates of a delay value for a sampled signal. One aspect of the invention is to perform, for the sampled signal, coarse-grained calculations of the In Phase and Quadrature (I and Q) correlation integrals at a limited number of points, wherein the calculations are performed over a range of hypothesized delay values. A range of delay values of interest are then determined from the coarse-grained calculations of the I and Q correlation integrals. A subset of I and Q values based on the coarse granularity calculations of the I and Q correlation functions is used to perform a time-domain interpolation to obtain fine-grained values of the I and Q integrals in the range of the delay values of interest. Magnitude calculations are performed based on the fine-grained values of the I and Q integrals. Fine-tuned estimates of delay value are based on the magnitude calculations. Alternatively, fine-tuned estimates of delay value are based on the template-matching approach.
Methods (FIGS. 7 and 8) and corresponding apparatus (200) for estimating a parameter (125) associated with a received signal (120), one method comprising: providing (704, 806) a signal sample (129, 301) corresponding to the received signal (120); processing the signal sample (705, 807) to suppress on channel interference and provide a processed sample or signal estimate; and determining, for example, a delay parameter by comparing (709, 809) the processed sample to a predetermined sample.
