Patent ID: 9042488
Filing Date: 2015-05-26
Classification: H04L

Abstract:
1. A phase offset compensator for compensating a phase offset, the phase offset comprising a first phase sub-offset and a second phase sub-offset, the phase offset compensator comprising: a feedback loop configured to compensate the first phase sub-offset of the phase offset; a feed forward loop configured to compensate the second phase sub-offset of the phase offset; wherein the feedback loop and the feed forward loop commonly comprise a phase offset detector, a first loop filter comprising a first order loop filter and a second order loop filter arranged in parallel, an adder, a second loop filter and a Cordic unit, and the phase offset detector is configured to detect the phase offset upon a basis of an input signal and a lookup table in which the in-phase component and quadrant component of a quantized complex signal are the addresses of the lookup table, the first order loop filter is configured to receive the output of the phase offset detector and estimate a third phase sub-offset, the second order loop filter is configured to receive the output of the phase offset detector and estimate an accumulated phase sub-offset introduced by a frequency offset, the adder is configured to sum up the third phase sub-offset and the accumulated phase sub-offset, the second loop filter is a low-pass filter configured to filter the output of the adder, the Cordic unit is configured to implement conversion on a phase offset estimate output by the second loop filter.