Patent ID: 7974364
Filing Date: 2011-07-05
Classification: H04B,H04L

Abstract:
1. A method for Doppler frequency estimation and adaptation in a mobile multimedia multicast system, said method comprising: receiving, in a receiver, a mobile multimedia multicast superframe comprising Orthogonal Frequency Division Multiplexing (OFDM) symbols; dividing a Doppler frequency range into N ranges corresponding to N interpolation filters, wherein said N is an integer; determining a correlation estimating a Doppler frequency f determining an α ratio of the correlation of OFDM symbols; comparing the determined α ratio of the correlation of OFDM symbols with a look up table of α stored at said receiver to determine a corresponding Doppler frequency; mapping α ranges stored at said look up table to suitable interpolation filters; estimating an interpolation filter from the mapped α ranges mapped against said determined α ratio; adapting Time Domain Interpolation (TDI) to the estimated interpolation filter; and synchronizing said receiver to said mobile multimedia multicast superframe and the received OFDM symbols based on the adapted TDI filter.