Phase Error Compensation with Cyclic Slip Tolerance
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Solution Overview
Problem
Conventional phase error compensation methods in coherent communication systems are prone to cyclic slip, especially under high noise conditions, and often compromise signal quality or require increased overhead, failing to accurately compensate for phase errors in individual symbols.
Innovation Solution
A method and apparatus that determine phase error candidates based on symbol phases of multiple blocks of a received signal, calculating an initial and final estimation error to compensate for phase errors, thereby reducing the likelihood of cyclic slip while maintaining accurate noise compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional phase error compensation is performed using estimation error from received signals, then phase error compensation is achieved, but cyclic slip occurs under high noise conditions
Solution Approach 1:
The patent divides the phase error compensation process into two distinct stages: coarse compensation using differential coding to prevent cyclic slip, and fine compensation using estimation error to achieve high accuracy. This segmentation allows each stage to address specific aspects of the problem without interfering with the other, thereby preventing cyclic slip while maintaining compensation accuracy.
Solution Approach 2:
The patent applies preliminary coarse phase error compensation using differential coding before performing fine compensation with estimation error. By pre-preventing cyclic slip through the first stage, the system ensures that the second stage operates on stable phase values, thereby eliminating the harmful effect of cyclic slip before fine compensation begins.
2Object-affected harmful factors
If differential coding is used to prevent cyclic slip, then cyclic slip is reduced, but more errors occur at the same signal noise
Solution Approach 1:
The patent segments the compensation function into two parts: differential coding handles cyclic slip prevention (coarse compensation), while estimation error handling achieves high accuracy (fine compensation). This segmentation allows the system to benefit from both methods without suffering their respective drawbacks, as each method operates in its optimal domain.
Solution Approach 2:
The patent merges differential coding and estimation error compensation into a unified two-stage process. By combining the cyclic slip prevention capability of differential coding with the high accuracy of estimation error compensation, the system achieves both reliability and precision that neither method could achieve alone.
3Object-affected harmful factors
If block-based phase error compensation is used to suppress cyclic slip, then cyclic slip occurrence is reduced, but phase compensation accuracy for individual symbols deteriorates
Solution Approach 1:
The patent segments the compensation process into coarse and fine stages, where the first stage uses a block-based approach to prevent cyclic slip, and the second stage uses symbol-level estimation error to achieve high precision for individual symbols. This segmentation allows the system to benefit from both block-based stability and symbol-level accuracy.
Solution Approach 2:
The patent applies preliminary coarse compensation using block-based methods to stabilize phases and prevent cyclic slip before performing fine compensation with symbol-level estimation error. This preliminary action ensures that subsequent fine compensation operates on stable phase values, achieving both cyclic slip prevention and high accuracy for individual symbols.
Data Source
AI summary
Disclosed is a method and apparatus for phase error compensation having tolerance to a cyclic slip. The method includes determining first phase error candidates based on symbol phases of a first block of a received signal, determining an initial estimation error according to the first phase error candidates, determining second phase error candidates based on symbol phases of a second block of the received signal, determining a final estimation error according to the initial estimation error and the second phase error candidates, and compensating for a phase of the received signal according to the final estimation error.