Patent ID: 8165229
Filing Date: 2012-04-24
Classification: H04L

Abstract:
1. A channel estimation method using pilots in an Orthogonal Frequency Division Multiplexing (OFDM) system, the channel estimation method comprising: receiving a symbol at an OFDM receiver; performing a first channel estimation at a pilot position of the received symbol, thereby calculating a first channel estimate; performing interpolation in a diagonal direction exclusively between the first channel estimate and a channel estimate for another pilot position that is different from the pilot position of the first channel estimate when viewed in directions of time and frequency axes, thereby calculating a second channel estimate for a data position, wherein the data position of the second channel estimate differs from both the pilot position of the first channel estimate, and the another pilot position, when viewed in directions of time and frequency axes; performing interpolation in the direction of the time axis between the second channel estimate and a channel estimate for another pilot position that is identical to the pilot position of the second channel estimate when viewed in the direction of the time axis, thereby calculating a third channel estimate for another data position; and performing interpolation in the direction of the frequency axis by using the channel estimates for the pilot positions and the second and third channel estimates, thereby calculating channel estimates for remaining data positions.