Real Time Subsample Time Resolution Signal Alignment in Time Domain

摘要

System and method for subsample time resolution signal alignment. First and second signals may be aligned by iteratively performing the following until a termination condition is met: current samples of the first and second signals may be acquired, a delayed copy of the current samples of the first signal may be generated and subtracted from the current samples of the first signal to generate a third signal, a delayed copy of the current samples of the second signal may be generated with a current subsample delay and subtracted from the current samples of the first signal to generate a fourth signal, and an alignment error may be generated based on the third and fourth signals and the current subsample may be delay adjusted accordingly. The iteratively adjusting may generate a subsample resolution delay aligning the second signal to the first signal. Subsequent samples the first signal and the second signal may be aligned and output per the subsample resolution delay.

主权项

1. A system, comprising:
an input; a functional unit, coupled to the input; and an output, coupled to the functional unit; wherein the functional unit is configured to:
a) acquire, via the input, a current set of samples of a first signal and a second signal;b) generate a delayed copy of the current set of samples of the first signal using a first delay;c) subtract the delayed copy of the current set of samples of the first signal from the current set of samples of the first signal, thereby generating a third signal;d) generate a delayed copy of the current set of samples of the second signal using a second delay, wherein the second delay has a current sub sample resolution time duration;e) subtract the delayed copy of the current set of samples of the second signal from the current set of samples of the first signal, thereby generating a fourth signal;f) generate an error in alignment of the first and second signals based on the third and fourth signals; andg) adjust the current subsample resolution time duration based on the error in alignment;perform a)-g) one or more times in an iterative manner, wherein iteratively adjusting the current subsample resolution time duration generates a subsample resolution delay that aligns the second signal to the first signal; andoutput, via the output, subsequent sets of samples of the first signal and the second signal in accordance with the subsample resolution delay, wherein the subsequent sets of samples of the second signal are aligned with the subsequent sets of samples of the first signal.