Patent ID: 8300736

Claim:
A method used for phase reference tracking of digital phase modulated signals in the receiver, comprising the steps of: converting a received complex signal to the received phase r n ; feeding the received phase r n to a phase reference tracking unit; producing an estimated transmit phase {tilde over (s)} n from the phase reference tracking unit; feeding the estimated transmit phase {tilde over (s)} n to a coherent decoder; and producing a decoded symbol â n from the coherent decoder, wherein the procedure of producing an estimated transmit phase {tilde over (s)} n further comprising the steps of: subtracting a previous phase reference estimate {tilde over (θ)} n-1 from a received phase r n ; producing a tracking error ε n by subtracting a re-modulation phase signal ŝ n from an estimated transmit phase {tilde over (s)} n ; scaling the tracking error ε n by a value of β; adding the scaled of tracking error βε n with a previous phase correction factor {tilde over (θ)}′ n-1 and derive a phase correction factor {tilde over (θ)}′ n ; scaling the tracking error ε n by a value of α; adding the scaled of tracking error αε n with the phase correction factor {tilde over (θ)}′ n ; and adding the scaled of tracking error αε n with the phase correction factor {tilde over (θ)}′ n with the previous phase reference estimate {tilde over (θ)} n-1 and derive the phase reference estimate {tilde over (θ)} n .