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Multi-format carrier recovery for coherent real-time reception with processing in polar coordinates
Optics Express
|November 10, 2016
Summary
A novel blind frequency and phase search algorithm enables efficient joint recovery. Its FPGA implementation demonstrates real-time performance for advanced digital communication systems.
Area of Science:
- Digital Communications
- Signal Processing
- Hardware Acceleration
Background:
- Carrier recovery is crucial for coherent detection in digital communication systems.
- Existing algorithms often face complexity or hardware limitations.
- Efficient joint frequency and phase recovery is needed for high-speed optical systems.
Purpose of the Study:
- To introduce a low-complexity blind algorithm for joint frequency and phase recovery.
- To demonstrate its real-time implementation on FPGA hardware.
- To evaluate its performance under various impairments and hardware constraints.
Main Methods:
- Processing in polar coordinates to minimize multiplications.
- FPGA implementation for real-time processing at 32 GBd.
- Dynamic multi-format operation supporting 4QAM, 8QAM, and 16QAM.
- Performance evaluation considering laser phase noise and frequency offsets.
Main Results:
- The algorithm achieves low complexity and enables real-time processing.
- FPGA implementation supports flexible format switching (4QAM, 8QAM, 16QAM).
- Negligible performance penalty compared to floating-point simulations was observed.
- Feasibility demonstrated even with limited hardware resources.
Conclusions:
- The proposed blind algorithm offers an efficient solution for joint frequency and phase recovery.
- FPGA implementation validates its real-time capability and flexibility for high-speed optical communications.
- The approach is robust against common impairments and hardware limitations.
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