Costas loop bandwidth

1. What is the advantage of Costas loop?
2. How does a Costas loop work?
3. What type of feedback is used in Costas loop and why?
4. What are the applications of Costas loop?

What is the advantage of Costas loop?

. This translates to double the sensitivity and also makes the Costas loop uniquely suited for tracking Doppler-shifted carriers, especially in OFDM and GPS receivers.

How does a Costas loop work?

A costas loop is an analog circuit that can regenerate a carrier and its phase from an input signal without any or with minimal carrier content. It is a phase-locked loop that relies on frequency content of the input signal sidebands.

What type of feedback is used in Costas loop and why?

Fig 1 -- In the basic phase-locked loop structure the system relies on feedback formed by mixing a reference signal with a received waveform. received signal are equal in phase and frequency they are locked in sync.

What are the applications of Costas loop?

The Costas loop is a classical analog PLL based circuit for carrier recovery[6–8]. Nowadays, among the applications of Costas loop, there are global positioning systems (GPS)[9, 10], wireless communication[11] and others[8, 12–19].