Iterative mitigation of nonlinear co-channel interference in high-efficiency multibeam satellite systems

A computer implemented method comprising:

• providing a composite signal comprising an induced nonlinear distortion, a desired signal and interferer signals, wherein the desired signal comprises desired symbols and the interferer signals comprise interferer symbols;
• and
• iteratively computing, N frameworks, each of the N frameworks comprising
• partitioning, with a detector, the desired symbols and the interferer symbols based on an interference severity into a dominant group and a non-dominant group, and
• generating A Posteriori Probabilities (APP) of the desired symbols and the interferer symbols,
• wherein the detector of each of the N frameworks generates the APP based on a feedback of the APP from each of the N frameworks,
• the detector reduces the induced nonlinear distortion of the desired signal using a nonlinear mathematical model, and
• the nonlinear mathematical model comprises a Volterra series represented as
• s
• NL
• ,
• n
• (
• t
• )
• =
• ∑
• l
• λ
• ~
• n
• ,
• l
• ·
• (
• s
• n
• (
• t
• )
• ·
• ❘
• "\[LeftBracketingBar]"
• s
• n
• (
• t
• )
• ❘
• "\[RightBracketingBar]"
• l
• -
• 1
• )
• ,
• where {tilde over (λ)}n,l are complex-valued coefficients to account for the induced nonlinear distortion of a respective High-Power Amplifier (HPA) of N HPAs and sn(t) is a baseband representation of the desired signal after pulse shaping.