PROCESS FOR SUPPRESSING INTERCARRIER INTERFERENCE IN A OFDM RECEIVER

摘要

Process for canceling lntercarrier Interference in a OFDM receiver receiving OFDM blocks in presence of Doppler, comprising the steps of : receiving a OFDM block comprising N samples; applying a FFT for the purpose of generating N frequency domain representations composing the received signal (R); multiplying said received signal (R) by the hermitian value of the channel (HH), with H being the channel estimate; applying on said received signal a preconditioned conjugate gradient algorithm based on a NxN P preconditioner matrix; Characterized in that said preconditionner matrix is computed at follows: Formula (19) and formula (20), where formula (I) is a L FIR X PN selection matrix obtained by extracting a predetermined number (L FIR) of rows from the identity matrix IPN, LFIR being a predetermined integer inferior to PN, with p corresponding to the basis expansion order chosen and N is the FFT size; formula (II) is equal to HF H, with H being the frequency-domain channel matrix and F being the N x N discrete-Fourier transform unitary matrix F; formula (III)is the NxN identity matrix; formula (IV) is the varience of the noise; formula (V) is being the 1 x N vector containing 1 in n-th position and 0 elsewhere.