Fast carrier recovery in FHSS systems with DDS based Costas loop

Authors

  • Slavko Šajić

DOI:

https://doi.org/10.7251/ELS1519003S

Abstract

Owing to fast change of carrier frequency, the usage
of coherent demodulation methods in Frequency-Hopping Spread
Spectrum (FHSS) communication systems is limited by the
coherent state acquisition performed by the local oscillator. To
get around this difficulty, it is needed to implement the circuit
within the FHSS system that is able to rapidly generate a
coherent carrier. The work presented in this paper proposes a
realization of Costas loop based on a combination of Direct
Digital Synthesis (DDS), (Temperature-Compensated) Voltage-
Controlled Oscillator ((TC)VCXO), and Phase-Locked Loop
(PLL), which in particular enables a short period (less than 100
μs) required for a local oscillator to reach the coherent state. The
implemented model is thoroughly described with measurements
results also provided.

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Published

2015-07-22

Issue

Vol. 19 No. 1 (2015): Electronics, Volume 19, Number 1

Section

Чланци

License

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