-
公开(公告)号：US10778499B2
公开(公告)日：2020-09-15
申请号：US16052835
申请日：2018-08-02
Applicant: TELEFONICA, S.A.
Inventor： Javier Lorca Hernando , Carlos González Sánchez
Abstract: 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.
Search Results
1
records
(took 0.009 seconds)
