FFT Based Carrier Recovery with Lower Processing Speed Using DSP Techniques
Author Name : Vikas Kumar, Divya K. N
ABSTRACT Carrier recovery is one of most important block during demodulation. In closed loop system like Costas loop, stability of loop depends on the loop filter drastically, sometimes which become cumbersome when higher accuracy is required. In this paper, a novel approach to track carrier signal in terms of frequency and phase is explained. The concept of digital mixer and decimating filters are used to reduce processing speed. Fast Frequency Transform (FFT) working at lower operating frequency is used to track frequency to higher accuracy. The phase offset is tracked using digital phase comparator and digital phase shifter. The blocks are simulated in Matlab.