Coherent Optical Transmission Pilot Framing for Faster Interference Tracking
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Solution Overview
Problem
In coherent optical communication systems with dual-polarization transmission and single-polarization reception, rapid changes in interference lead to slow parameter adjustment speeds and inaccurate interference resolution due to calculation delays and parallel processing, which are not effectively addressed by existing correction methods.
Innovation Solution
A data transmission method that includes generating data frames with specific positions for reference pilot information and redundant codes, allowing for timely parameter adjustment of correction functions using pilot information to adapt to rapid interference changes, thereby improving interference elimination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If parameter adjustment is performed continuously based on correction function output in related technology, then the correction function can adapt to changing interference, but calculation delay and parallel processing delay cause slow parameter adjustment speed
Solution Approach 1:
The patent applies preliminary action by inserting reference pilot information at specified positions in data frames before actual data transmission. This reference pilot information enables the receive end to perform parameter adjustment in advance based on known reference data, rather than waiting for correction function output. The reference pilot information includes reference pilot symbols that are predetermined and known to both transmit and receive ends, allowing the system to pre-calculate adjustment parameters before interference significantly changes, thus resolving the contradiction between adaptability and adjustment speed.
2Measurement precision
If parameter adjustment is performed continuously to track rapid interference changes, then interference resolution accuracy improves, but calculation delay prevents timely adaptation
Solution Approach 1:
The patent performs parameter adjustment preliminarily using reference pilot information that is inserted at specified positions in data frames. This allows the receive end to calculate adjustment parameters before processing actual data, eliminating the time delay associated with waiting for correction function output. The reference pilot symbols are predetermined and enable immediate parameter calculation when received, ensuring both high accuracy and timely adaptation to interference changes.
Solution Approach 2:
The patent introduces reference pilot information as an intermediary element between the transmitted data and the parameter adjustment process. This reference pilot information serves as a known reference that mediates the parameter adjustment calculation, allowing the system to determine adjustment parameters based on comparison between received reference pilot symbols and expected reference pilot symbols. This intermediary approach enables accurate and timely interference resolution without the delays of continuous correction function processing.
3Measurement precision
If more reference pilot symbols are used to improve parameter adjustment accuracy, then interference elimination improves, but data transmission efficiency decreases
Solution Approach 1:
The patent applies local quality by inserting reference pilot information only at specified positions in data frames rather than throughout the entire transmission. The reference pilot symbols are placed at specific locations where they provide maximum benefit for parameter adjustment while minimizing impact on overall data transmission. This localized approach ensures sufficient accuracy for interference elimination without unnecessarily reducing data transmission efficiency.
Solution Approach 2:
The patent uses partial action by inserting reference pilot information at selected positions rather than continuously or at every possible position. The reference pilot symbols are inserted at specified positions that provide adequate samples for parameter adjustment without excessive overhead. This partial insertion strategy achieves the necessary adjustment accuracy while maintaining high data transmission efficiency by leaving most of the data frame capacity available for actual data transmission.
Data Source
AI summary
Embodiments of this application disclose a data transmission method and apparatus, a device, and a storage medium, and relate to the field of optical communication technologies. In a coherent optical transmission system with dual-polarization transmission and single-polarization reception, a transmit end sends a data frame including a subframe including reference pilot information, a data unit, and a corresponding redundant code, where a 1st subframe in each data frame includes more reference pilot symbols than other subframes. A receive end performs parameter adjustment on a correction function based on pilot information and the reference pilot information in the received data frame.