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Distributed-Satellite-Clusters-Based Spectrum Sensing with Two-Stage Phase Alignment.

Yunfeng Wang1,2, Xiaojin Ding1,3, Tao Hong1,2

  • 1Telecommunication and Networks National Engineering Research Center, Nanjing 210003, China.

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This summary is machine-generated.

We developed a cooperative spectrum sensing scheme for distributed satellite clusters (DSC) to improve weak signal detection. Our method effectively mitigates phase deviations, enhancing sensing performance against traditional methods.

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Area of Science:

  • Wireless Communication
  • Satellite Systems Engineering
  • Signal Processing

Background:

  • Distributed satellite clusters (DSC) offer enhanced capabilities for spectrum sensing.
  • Phase deviations among satellite clusters, caused by movement and perturbation, degrade spectrum-sensing performance.
  • Accurate detection of weak signals is crucial for efficient spectrum utilization.

Purpose of the Study:

  • To propose a cooperative spectrum-sensing scheme for DSC systems that mitigates phase deviations.
  • To enhance the ability of DSC systems to sense weak signals despite phase inconsistencies.
  • To provide a robust solution for spectrum sensing in dynamic satellite environments.

Main Methods:

  • A two-stage phase synchronization technique is employed to alleviate phase deviations.
  • Stage one uses reference signals and ephemeris for movement-induced deviations.
  • Stage two utilizes a two-bit feedback algorithm with dynamic step size for perturbation-induced deviations.

Main Results:

  • The proposed scheme effectively mitigates phase deviations caused by both satellite movement and perturbation.
  • A closed-form expression for correct detection probability was derived using a novel probability density function.
  • Simulation results demonstrate superior performance compared to traditional energy detection, eigenvalue ratio test, and generalized likelihood ratio test.

Conclusions:

  • The proposed cooperative spectrum-sensing scheme significantly improves performance in DSC systems.
  • The two-stage phase synchronization effectively addresses phase deviations, enhancing weak signal detection.
  • This approach offers a robust and high-performance solution for spectrum sensing in satellite networks.