A carrier recovery scheme for 4-CPFSK with h=1/4

A carrier recovery scheme for 4-CPFSK with h=1/4

A carrier recovery scheme for 4-level CPFSK with h=1/4 is proposed. It is based on four frequency-switched Costas or in phase-quadrature (I-Q) loops, each synchronized on one of the signalling frequencies. The term "frequency-switched" refers to the way which one loop at a time is closed,...

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Hauptverfasser: Schoonees, J.A., Braun, R.M.
Format: Tagungsbericht
Sprache:eng
Schlagworte:
Africa
Circuits
Cities and towns
Decoding
Frequency estimation
Frequency synchronization
Oscillators
Quadrature phase shift keying
Switches
Tracking loops
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description A carrier recovery scheme for 4-level CPFSK with h=1/4 is proposed. It is based on four frequency-switched Costas or in phase-quadrature (I-Q) loops, each synchronized on one of the signalling frequencies. The term "frequency-switched" refers to the way which one loop at a time is closed, depending on the data (frequency) estimate after decoding. From the I-Q loop's viewpoint, the CPFSK signal contains the correct signaling frequency on average only a quarter of the time. For the rest of the time, the signal is tracked by the other loops. This is not to be confused with data-aided or decision-feedback synchronization. Each loop resembles the conventional QPSK Costas loop synchronizer, with additional circuitry to rotate the signal space. Simulation results are presented.< >
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subjects Africa
Circuits
Cities and towns
Decoding
Frequency estimation
Frequency synchronization
Oscillators
Quadrature phase shift keying
Switches
Tracking loops
title A carrier recovery scheme for 4-CPFSK with h=1/4
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