Orthogonal Signal Encoding for Coupled Channel Crosstalk
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Solution Overview
Problem
Current communication systems face issues with energy crosstalk and high equalization complexity due to cross coupling between signal channels, limiting high-density multi-channel interconnection.
Innovation Solution
A transmission system using an orthogonal encoding matrix to process signals, ensuring that each signal on coupled channels has independent electric field directions, reducing crosstalk and equalization complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chord encoding is used to transmit N signals on N coupled signal channels, then signal transmission is achieved, but energy crosstalk occurs between channels
Solution Approach 1:
The patent transforms the encoding parameters from conventional chord encoding to orthogonal encoding using specific orthogonal matrices (Hadamard, DFT, or custom-designed). This parameter change in the encoding domain ensures that encoded signals on coupled channels maintain orthogonality, thereby eliminating energy crosstalk while preserving transmission capability
Solution Approach 2:
The patent converts the harmful effect of channel coupling into a beneficial feature by designing orthogonal encoding matrices that exploit the coupling characteristics. The coupling that normally causes crosstalk is transformed into an advantage where the orthogonal encoded signals naturally cancel out interference, turning the harmful coupling effect into a benefit for crosstalk reduction
2Productivity
If conventional encoding is used on coupled channels, then transmission is possible, but equalization complexity increases
Solution Approach 1:
The patent performs preliminary orthogonal encoding at the transmitter before signal transmission. This pre-processing action embeds the anti-crosstalk characteristics directly into the transmitted signals, so that when signals are received, the equalization process becomes simpler because the orthogonal structure already compensates for channel coupling effects, reducing the complexity of subsequent equalization operations
Data Source
AI summary
A transmission system includes a sending apparatus and N signal channels, where N≥2, and N is an integer. The sending apparatus includes a first apparatus, and the first apparatus is configured to: obtain N to-be-transmitted signals and an encoding coefficient group, where the N to-be-transmitted signals are represented as an N×1 signal matrix X, and the encoding coefficient group is represented as an N×N orthogonal encoding matrix T; process the N to-be-transmitted signals based on the encoding coefficient group to generate N encoded first signals, where the N encoded first signals are represented as a signal matrix Y; and send the N encoded first signals to the N signal channels, where a signal on each signal channel corresponds to an element in a row of the signal matrix Y.