THP Precoding Inter-Symbol Interference Reduction
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Solution Overview
Problem
In optical transmission systems, parallel precoding by THP operation units leads to inter-symbol interference due to the inability to feed back the end of one data block to the beginning of another, especially when data blocks are transmitted in the original order, causing interference from near the end of one block to the beginning of the next.
Innovation Solution
A transmission device and method that imparts redundant data to the beginning of each data block, allowing THP operation units to feed back redundant symbols, thereby reducing inter-symbol interference by altering the transmission order and compensating for interference from preceding data blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data blocks are transmitted in the original order without redundant data, then transmission efficiency is maintained, but inter-symbol interference occurs from the end of one block to the beginning of the next block
Solution Approach 1:
Redundant data is prepended to each data block before transmission, enabling the THP operator to perform feedback processing on these redundant symbols. This preliminary action allows interference compensation to occur before the actual data transmission, resolving the inter-symbol interference issue without compromising transmission efficiency
Solution Approach 2:
Redundant data acts as an intermediary element between data blocks. By transmitting redundant data at the beginning of each block and feeding it back through the THP operator, the system creates a buffer that prevents direct interference between adjacent data blocks while maintaining overall transmission efficiency
2Reliability
If redundant data is added to each data block, then inter-symbol interference is reduced, but data block size increases
Solution Approach 1:
The redundant data is discarded at the transmitter side after serving its purpose of enabling feedback processing, and recovered/reconstructed at the receiver side through the inverse THP operation. This allows the system to benefit from the redundant data for interference cancellation without permanently increasing the transmitted data volume
Solution Approach 2:
The system changes the temporal arrangement parameter by moving redundant data to the beginning of data blocks rather than appending it at the end. This parameter change enables the feedback mechanism to work effectively while minimizing the impact on overall data block size and transmission efficiency
Data Source
AI summary
A transmission device includes an imparter configured to impart redundant data to the beginning of each of a plurality of data blocks divided from a data signal, a plurality of THP operators configured to parallelly precode the plurality of data blocks to which the redundant data is imparted, a transmitter configured to sequentially transmit the plurality of data blocks precoded by the plurality of THP operators and the redundant data imparted to each of the plurality of data blocks to a transmission line according to an arrangement order in the data signal, wherein the plurality of THP operators feed back a plurality of pieces of the redundant data to the plurality of data blocks, respectively.