Systems and methods for noise tolerant signal processing in pilot assisted data receivers
The present disclosure provides systems and methods for noise tolerant signal processing in a pilot assisted data receiver, including: given received pilots with common pilot components and individual pilot components, computing coefficients associated with the individual pilot components of the received pilots; and applying the computed coefficients to the received pilots to obtain conditioned pilots. The individual pilot components result from relatively slow changes of the received pilots relative to the common pilot components. The common pilot components result from relatively fast changes of the received pilots relative to the individual pilot components.
1. A method for noise tolerant signal processing in a pilot assisted data receiver, comprising:
given received pilots with common pilot components and individual pilot components that collectively describe the received pilots completely and are averaged/filtered separately, computing coefficients associated with the individual pilot components of the received pilots;
applying the computed coefficients to the received pilots to obtain conditioned pilots, wherein applying the computed coefficients to the received pilots to obtain the conditioned pilots comprises deriving a linear combination of the individual pilot components with weights corresponding to the computed coefficients; and
converting the conditioned pilots to a constant amplitude phasor by removing associated noise related to amplitude fluctuations,
wherein the common pilot components comprise a dynamic phase factor produced by a frequency offset and a phase noise and the individual pilot components comprise a quasi-static portion related to a polarization evolution.
2. The method of claim 1 , further comprising removing noise from the individual pilot components by averaging/filtering the individual pilot components.
3. The method of claim 2 , wherein the averaging/filtering the individual pilot components comprises one of averaging the individual pilot components in a time domain and low pass filtering the individual components in a frequency domain.
4. The method of claim 1 , further comprising preserving the common pilot components using wideband signal processing.
5. The method of claim 1 , further comprising down converting the received pilots to a baseband.
6. A pilot assisted data receiver for noise tolerant signal processing, comprising:
a processing circuit operable for: given received pilots with common pilot components and individual pilot components that collectively describe the received pilots completely and are averaged/filtered separately, computing coefficients associated with the individual pilot components of the received pilots;
applying the computed coefficients to the received pilots to obtain conditioned pilots, wherein applying the computed coefficients to the received pilots to obtain the conditioned pilots comprises deriving a linear combination of the individual pilot components with weights corresponding to the computed coefficients; and
converting the conditioned pilots to a constant amplitude phasor by removing associated noise related to amplitude fluctuations,
wherein the common pilot components comprise a dynamic phase factor produced by a frequency offset and a phase noise and the individual pilot components comprise a quasi-static portion related to a polarization evolution.
7. The data receiver of claim 6 , wherein the processing circuit is further operable for removing noise from the individual pilot components by averaging/filtering the individual pilot components.
8. The data receiver of claim 7 , wherein the averaging/filtering the individual pilot components comprises one of averaging the individual pilot components in a time domain and low pass filtering the individual components in a frequency domain.
9. The data receiver of claim 6 , wherein the processing circuit is further operable for preserving the common pilot components using wideband signal processing.
10. The data receiver of claim 6 , wherein the processing circuit is further operable for down converting the received pilots to a baseband.