Patent ID: 7929620

Claim:
A method of using an orthogonal frequency division multiplexing (OFDM) system for blind channel estimation, comprising the steps of: (a) generating an i-th symbol block S i including N carriers; (b) using the OFDM system for performing an inverse fast Fourier transform (IFFT) operation on the i-th symbol block and forming an OFDM symbol block; (c) attaching a guard interval sample in front of the i-th OFDM symbol block U i and forming at least one OFDM symbol block U i,cp ; and (d) modeling the formed OFDM symbol block U i,cp with a channel finite impulse response (FIR) filter h and noise v, and estimating channel impulse response using signals y i received through a channel, wherein N and i are non-zero positive integers, and wherein the signals y i received in step (d) are defined by the following: y i =H[ u T i−1,q−1 u T i,cp ] T + v i , wherein H is a channel matrix, u i−1,q−1 is a signal of a (q−1)th sub-block of an (i−1)th transmission block, and v i is an i-th block noise signal vector.