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Carrier Recovery
47
Transcript
Definition:
Remodulator
- It is a process of extracting a phase-coherent reference carrier from a receiver signal.
- A circuit used to estimate and compensate for frequency and phase difference.
- Sometimes called as Phase Referencing.
- The third method of achieving recovery of a phase and frequency coherent carrier.
- Has faster acquisition time than either the squaring or the costas loop.
Sophisticated Methods of Carrier Recovery
Figure 2 - 39 : Remodulator loop carrier recovery circuit
- Squaring Loop
- Costas Loop
- Remodulator
Overview of the Topic
Carrier Recovery
1. Definition of Carrier Recovery
2. Methods of Carrier Recovery
a. Squaring Loop
b. Costas Loop
c. Remodulator
Costas Loop
- A Costas loop is a phase-locked loop based circuit which is used for carrier phase recovery from suppressed-carrier modulation signals.
- The primary application of Costas loops is in wireless receivers.
- Same result as Squaring loop.
Squaring Loop
- A common method of achieving carrier recovery for BPSK is the squaring loop.
- It removes the modulation and generates the second harmonic of the carrier frequency.
Figure 2-38 : Costas loop carrier recovery circuit
Figure 3 - 27 : Squaring loop carrier recovery circuit for BPSK receiver
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