Patent ID: 9008198
Filing Date: 2015-04-14
Classification: H04L

Abstract:
1. A method for time tracking synchronization in an orthogonal frequency-division multiplex (OFDM) system, the method comprising: receiving, by a mobile device, at least one time-division multiplexed (TDM) transitional pilot symbol comprising a plurality of modulated sub-carriers that provide a channel estimate having a length that is equal to a duration of an FFT used for data, wherein the at least one TDM transitional pilot symbol provides the channel estimate having the length equal to the duration of the FFT used for data when all sub-carriers of the at least one TDM transitional pilot symbol are modulated as pilots, and wherein the at least one TDM transitional pilot symbol is positioned within a superframe at a boundary between wide area data and local area data; determining an instantaneous channel estimate from the plurality of modulated sub-carriers included in the at least one TDM transitional pilot symbol; and calculating a timing offset based on the instantaneous channel estimate.