Carrier frequency offset estimation method and system
AssigneeIndustrial Technology Research Institute
InventorsJiun-Yo Lai, Jen-Yuan Hsu, Chin-Hung Chen, Pang-An Ting
Life of this patent
Estimating the term…
Abstract
In one aspect of the invention, a carrier frequency offset (CFO) estimation method to estimate a CFO value of a received signal is provided, and the method comprises: receiving a preamble signal which includes several non-perfect repeat segments; applying an interpolation procedure to interpolate the perfect repeat point of one segment compared with the next segment or the previous segment; acquiring a delay correlation value based on the two perfect repeat signal segments and estimating the CFO value based on the delay correlation value.
Claims18
A carrier frequency offset estimation method to estimate a carrier frequency offset value of a received signal, comprising:
- receiving a preamble signal including a first repeat signal segment and a second repeat signal segment;
- applying an interpolation procedure on the first repeat signal to generate a first signal;
- and
- acquiring a delay correlation value based on the first and the second repeat signals and estimating the carrier frequency offset value based on the delay correlation value,
- wherein the interpolation procedure comprises:
- determining data values of a plurality of interpolation points based on at least two sampling point of the first repeat signal;
- and
- selecting corresponding data values from the sampling points of the first repeat signal and the interpolation points based on positions of the second repeat signal to generate the first signal.
A carrier frequency offset estimation system to estimate a carrier frequency offset value of a received signal comprising a first repeat signal and a second repeat signal, the system comprising:
- a conjugate signal generator comprising an interpolation filter and a computing unit, receiving the first repeat signal to generate a first conjugate signal corresponding to the second repeat signal by the interpolation filter and the computing unit;
- a first multiplier to calculate a first product of the second repeat signal and the first conjugate signal;
- and
- a carrier frequency offset estimator to estimate the carrier frequency offset value based on the first product, wherein the interpolation filter implements an interpolation procedure and the interpolation procedure comprises:
- determining data values of a first interpolation point and a second interpolation point based on a first sampling point and a second sampling point of the first repeat signal;
- and
- selecting corresponding data values from the data values of the first interpolation point, the second interpolation point, the first sampling point and the second sampling point based on positions of the second repeat signal to generate a first signal.
Dependencies are inferred from the claim text.