Patent ID: 7961697
Filing Date: 2011-06-14
Classification: H04L

Abstract:
1. A method for estimating a timing error and a frequency offset based on a received signal in a high speed portable Internet system, the method comprising: a) processing the received signal to generate an Orthogonal Frequency Division Multiplexing (OFDM) symbol, wherein the OFDM symbol comprises a predetermined preamble symbol multiplexed with a Pseudo Noise (PN) sequence of a transmitter and wherein a remaining value between two non-zero values of a preamble sequence corresponding to the preamble symbol is 0, and extracting a preamble symbol from the OFDM symbol; b) multiplexing the extracted preamble symbol by a local PN sequence, wherein the local PN sequence is equal to the PN sequence of the transmitter but is shifted; c) estimating the timing error based on an amplitude of a signal having the local PN sequence multiplexed by the extracted preamble symbol, and compensating for the estimated timing error; and d) estimating the frequency offset based on the preamble symbol multiplexed by the local PN sequence, and compensating for the estimated frequency offset, wherein the amplitude of the signal is determined based on the local PN sequence and the PN sequence.