Patent ID: 8654914
Filing Date: 2014-02-18
Classification: H04L

Abstract:
1. A method of estimating a symbol boundary for adaptive time synchronization in a communication system, the method comprising: receiving a signal comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols from a plurality of receiver chains, wherein the OFDM symbols include at least a long training field (LTF) symbol; determining a normalized correlation signal based on correlation between the received LTF symbol and a reference symbol for each of the receiver chains for different lags; estimating an energy window length for the normalized correlation signal, wherein the estimated energy window length comprises at least one of channel delay spread and maximum cyclic shift applied to the signal at a transmitter; and estimating the symbol boundary associated with the received LTF symbol based on a position of peak energy of the normalized correlation signal using the estimated energy window length.