PROCÉDÉ POUR CONFÉRER UNE ROBUSTESSE ACCRUE CONTRE LE BRUIT ET LES INTERFÉRENCES DANS DES COMMUNICATIONS SANS FIL, ÉMETTEUR ET PRODUITS- PROGRAMME INFORMATIQUE CORRESPONDANTS

摘要

A method to provide increased robustness against noise and interference in wireless communications, a transmitter and computer program products thereof The method comprising sending, by a transmitter (11), to a receiver (13), through a wireless channel (12), information using a constant-envelope waveform with complex baseband representation of the form s [ n ] = A c exp{ jÆ [ n ]}, said phase Æ [ n ] following the expression Õ n ˆ’ Õ n ˆ’ 1 = 2 Àm ‹ ˆ‘ k = k 0 + 1 k 0 + N a , FM ˆ’ 1 + x k exp j 2 Àkn N , and said wireless channel (12) having an Additive White Gaussian Noise component and flat-fading conditions, wherein the transmitter (110) calculates a FFT length, N , and a number of active positive subcarriers, N a , FM + , that are needed in order to have a given improvement in the signal to noise ratio at the active positive subcarriers of the instantaneous frequency spectrum containing the information; calculates a cutoff subcarrier k 0 that is needed to overcome Doppler, phase noise and carrier frequency offset impairments at the receiver side, and generates a complex baseband signal waveform of the form s [ n ] = A c exp{ jÆ [ n ]} carrying the desired information with the chosen FFT length, number of active positive subcarriers and cutoff subcarrier.