Phase estimation method and apparatus for polarization multiplexing system
AssigneeHuawei Technologies Co., Ltd.
InventorYuanda Huang
Life of this patent
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Abstract
A phase estimation method and apparatus for a polarization multiplexing system, where the method includes performing, by a receive end, state of polarization (SOP) rotation on a received first SOP signal and second SOP signal according to an angle of previous SOP rotation, extracting a pilot using adaptive filtering, and performing carrier phase estimation according to the extracted pilot. This prevents a noise signal from being extracted and can make a carrier phase estimation result more accurate.
Claims18
A phase estimation method for a polarization multiplexing system, comprising:
- performing, by a receive end, state of polarization (SOP) rotation on a received first SOP signal (Xin) and a second SOP signal (Yin) according to an angle of previous SOP rotation;
- extracting, by the receive end, a pilot (Z2) using adaptive filtering, the SOP rotation being performed and the Z2 being extracted by:
- performing, by the receive end, the SOP rotation on the received Xin and the Yin using a formula Z2=Xin*hx+Yin*hy;
- tracking, by the receive end using the adaptive filtering, an angle of the SOP rotation;
- and
- extracting the Z2 by the receive end using the adaptive filtering, the hx and the hy indicating adaptive filtering coefficients obtained according to the angle of the previous SOP rotation;
- and
- performing, by the receive end, carrier phase estimation according to the Z2, the Xin and the Yin being orthogonal polarization signals.
A phase estimation method for a polarization multiplexing system, comprising:
- performing, by a receive end, state of polarization (SOP) rotation on a received first SOP signal (Xin) and a second SOP signal (Yin) according to an angle of previous SOP rotation;
- extracting, by the receive end, a pilot (Z2) using adaptive filtering, the SOP rotation being performed and the Z2 being extracted by:
- performing, by the receive end, the SOP rotation on the received Xin and the Yin according to the angle of the previous SOP rotation to obtain an SOP signal (Z1) after the SOP rotation;
- extracting, by the receive end using the adaptive filtering, the Z2 from the Z1;
- and
- performing, by the receive end, the SOP rotation on the received Xin and the Yin using a formula Z1=a·Xin+b·Yin, the a and the b being weighting coefficients obtained according to the angle of the previous SOP rotation, the Z2 being extracted from the Z1 comprising extracting, by the receive end using a formula Z2=Z1*h, the Z2 from the Z1, the h indicating an adaptive filtering coefficient, and the * indicating convolution;
- and
- performing, by the receive end, carrier phase estimation according to the Z2, the Xin and the Yin being orthogonal polarization signals.
A phase estimation apparatus for a polarization multiplexing system, comprising:
- a non-transitory computer-readable storage medium storing instructions;
- and
- a processor coupled to the non-transitory computer-readable storage medium, the instructions causing the processor to be configured to:
- perform state of polarization (SOP) rotation on a received first SOP signal (Xin) and a second SOP signal (Yin) according to an angle of previous SOP rotation;
- extract a pilot (Z2) using adaptive filtering, the SOP rotation being performed and the Z2 being extracted by:
- performing the SOP rotation on the received Xin and the Yin using a formula Z2=Xin*hx+Yin*hy;
- tracking, using the adaptive filtering, an angle of the SOP rotation;
- and
- extracting, using the adaptive filtering, the Z2, the hx and the hy indicating adaptive filtering coefficients obtained according to the angle of the previous SOP rotation;
- and
- perform carrier phase estimation according to the extracted Z2, the Xin and the Yin being orthogonal polarization signals.
Dependencies are inferred from the claim text.