Baishuo Zhang, Yansong Song, Lei Xiao, Dechun Zhao. Quadrature Phase Shift Keying Coherent Receiving Technology Based on Field Programmable Gate Array[J]. Laser & Optoelectronics Progress, 2023, 60(1): 0103001
- Laser & Optoelectronics Progress
- Vol. 60, Issue 1, 0103001 (2023)
Fig. 1. Classic structure of Costas loop
Fig. 2. Structure of four phase Costas loop
Fig. 3. Structure of improved Costas loop
Fig. 4. Improved Costas loop phase tracking diagram
Fig. 5. Comparison of enlarged diagram of frequency capture and tracking
Fig. 6. Costas loop performance simulation diagram based on Matlab
Fig. 7. Comparison of data before and after Costas loop I and Q
Fig. 8. Simulation diagram of random source
Fig. 9. Constellation mapping simulation diagram
Fig. 10. Modulation simulation diagram
Fig. 11. Register transfer level (RTL) diagram of demodulator module
Fig. 12. Data simulation before and after demodulating LPF
Fig. 13. Costas loop output simulation diagram
Fig. 14. Simulation diagram of decision module
Fig. 15. Comparison of simulation results
Fig. 16. Comparison of Costas loop frequency tracking curves. (a) Frequency tracking response of improved Coatas loop; (b) frequency tracking response of traditional Coatas loop
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