Patent ID: 6363102
Filing Date: 2002-03-26
Classification: H04B,H04L

Abstract:
An apparatus for frequency offset correction, comprising:a phase rotator receiving a pilot and a first phase adjustment value and outputting a rotated pilot, the pilot having a frequency offset and a phase rotation; a frequency discriminator receiving the rotated pilot and outputting a frequency error value; a phase calculation and delay unit receiving the frequency error value and outputting the first phase adjustment value and a second phase adjustment value; a pilot filter receiving the rotated pilot and outputting a channel estimate; and a phase derotator receiving the channel estimate and the second phase adjustment value and outputting a derotated channel estimate, wherein the first and second phase adjustment values are complex values, and wherein the second phase adjustment value is substantially a delayed version of the first phase adjustment value, and wherein the rotated pilot is substantially the pilot without the frequency offset, and wherein the channel estimate is substantially a complex value representing the phase rotation.