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A feedforward tracking filter. Part 2: Noise performance and applications

A feedforward tracking filter. Part 2: Noise performance and applications

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The performance of a Feedforward Tracking Filter (FTF) in the presence of white additive Gaussian noise is analysed. By studying the spectral properties and input-output signal-to-noise ratio (SNR), it is observed that the output of the nonlinear bandpass model of the FTF contains a mixture of signal and noise cross-modulation products. Due to the nonlinear effect, the FTF achieves tracking abilities at the expense of SNR. In addition, the probability density function of the phase error is evaluated. Finally, experimental results to verify the analysis and an application of the FTF to a fast carrier recovery system are presented.

References

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      • K.K. Lee , T. Le-Ngoc , V.K. Bhargava . A feedforward tracking filter. Part 1: Principle and tracking behaviour. J. Instn Electronic & Radio Engineers , 6 , 262 - 271
    2. 2)
      • A. Papoulis . (1955) , Probability, Random Variables, and Stochastic Processes.
    3. 3)
      • F.M. Gardner . (1979) , Phaselock Technique.
    4. 4)
      • A. Blanchard . (1976) , Phase-locked Loop Application to Coherent Receiver Design.
    5. 5)
      • W.B. Davenport , W.L. Root . (1958) , An Introduction to the Theory of Random Signals and Noise.
    6. 6)
      • D. Middleton . (1960) , An Introduction to Statistical Communication Theory.
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A feedforward tracking filter. Part 1: Principle and tracking behaviour
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