Patent ID: 7684774
Filing Date: 2010-03-23
Classification: H04B,H04H

Abstract:
1. A method for recovering a sub-carrier signal from a multiplexed signal having an embedded pilot tone signal, the method comprising: receiving the multiplexed signal; recovering a pilot signal from the received multiplexed signal; generating a frequency-doubled signal from the recovered pilot signal, wherein the frequency-doubled signal includes a band-pass phase offset from the embedded pilot tone signal; phase-shifting the frequency-doubled signal by a compensation phase and a pre-determined phase to generate a phase-shifted frequency-doubled signal, wherein the compensation phase is approximately equal to the band-pass phase offset and wherein a phase difference between the recovered pilot signal and the phase-shifted frequency-doubled signal is approximately equal to the pre-determined phase; and recovering two independent signals from the multiplexed signal based on the recovered pilot signal and the phase-shifted frequency-doubled signal.