公开(公告)号：US20190044672A1

公开(公告)日：2019-02-07

申请号：US16052835

申请日：2018-08-02

申请人： TELEFONICA, S.A.

发明人： Javier LORCA HERNANDO ,  Carlos GONZÁLEZ SÁNCHEZ

IPC分类号： H04L5/00 ,  H04W72/08 ,  H04L27/26

摘要： A method to provide robustness against noise and interference in wireless communications, a transmitter and computer program products, involving sending to a receiver (13), through a wireless channel (12), information using a constant-envelope waveform with complex baseband representation of the form s[n]=Ac exp{jϕ[n]}. The phase ϕ[n] following the expression ( φ  [ n ] - φ  [ n - 1 ] ) = 2  π   m · ∑ k = k 0 + 1 k 0 + N a , F   M + - 1  x  [ k ]  exp  ( j   2  π   kn N ) , and the wireless channel has 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, Na,FM+, 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 k0 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]=Ac exp{jϕ[n]} carrying information with the FFT length, number of active positive subcarriers and cutoff subcarrier.