Patent ID: 8270503
Filing Date: 2012-09-18
Classification: H04L

Abstract:
1. A method of estimating a carrier frequency offset in a Digital Radio Mondiale (DRM) receiver, the method comprising: performing orthogonal frequency-division multiplexing (OFDM) demodulation of a received DRM signal to produce a plurality of sequential OFDM symbols; for each of a plurality of cells within a first of the OFDM symbols and a corresponding plurality of cells within a second of the OFDM symbols, calculating a ratio of a cell gain and/or phase characteristic for a cell within the first of the OFDM symbols is substantially equal to a cell gain and/or phase characteristic in a corresponding cell within the second of the OFDM symbols; identifying frequency pilot cells in the first and second OFDM symbols by identifying counterpart cells within the first and second OFDM symbols having cell gain and/or phase characteristic value ratios that are substantially equal to one; identifying a carrier index of the frequency pilot cells; and estimating the carrier frequency offset based on the identified carrier index of the frequency pilot cell.