In the method, a detector retrieves certain signal samples from a data frame that are accumulated in a buffer of a base station receiver. The detector generates a first metric representing a first signal sample and a second metric representing a second signal sample, and calculates a sum of the first and second metrics and a difference between the first and second metrics. A calculator uses the sum to calculate at least one threshold value, and a comparator compares the difference to the calculated threshold value to determine an on-time error for the frame. Based on the determined on-time error, an adjuster adjusts timing for the on-time error, and feeds back an on-time error correction to the buffer for subsequently received data frames.