Pilot Signal Pre-compensation for FTN Interference
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Solution Overview
Problem
In faster than Nyquist (FTN) techniques, the shorter symbol cycle leads to inter-symbol interference, causing distortion in pilot symbols, which complicates channel estimation and synchronization due to varying distortion levels depending on adjacent data symbols.
Innovation Solution
A pilot signal generating apparatus and method that estimates the distortion caused by adjacent data symbols and adjusts the pilot symbols accordingly to cancel this interference, ensuring accurate channel estimation and synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the symbol transmission cycle is shortened to improve transmission efficiency, then productivity increases, but inter-symbol interference is generated causing pilot symbol distortion
Solution Approach 1:
The patent applies preliminary action by estimating the interference from adjacent data symbols before the pilot symbol is transmitted. The changed amount estimating unit calculates the expected interference in advance, and the pilot symbol generating unit pre-compensates the pilot symbol by adding this estimated interference. This pre-compensation ensures that when the pilot symbol passes through the channel, it arrives at the receiver with the interference already canceled, maintaining pilot symbol accuracy despite the shortened transmission cycle.
2Productivity
If the symbol transmission cycle is shortened to improve transmission efficiency, then productivity increases, but measurement precision of channel estimation and synchronization deteriorates
Solution Approach 1:
The patent applies preliminary action by estimating the interference from adjacent data symbols before the pilot symbol is transmitted. The changed amount estimating unit calculates the expected interference in advance, and the pilot symbol generating unit pre-compensates the pilot symbol by adding this estimated interference. This pre-compensation ensures that when the pilot symbol passes through the channel, it arrives at the receiver with the interference already canceled, maintaining pilot symbol accuracy despite the shortened transmission cycle.
3Productivity
If the symbol transmission cycle is shortened to improve transmission efficiency, then productivity increases, but device complexity increases due to distortion compensation requirements
Solution Approach 1:
The patent applies self-service by having the transmitting apparatus generate a compensated pilot symbol that inherently includes the interference cancellation information. The changed amount estimating unit and pilot symbol generating unit work together to create a pilot symbol that is self-sufficient - it carries both the original pilot information and the pre-calculated interference compensation. This eliminates the need for complex post-reception processing to remove interference, as the compensation is already embedded in the transmitted signal.
Data Source
AI summary
An exemplary embodiment of the present invention provides a pilot signal generating apparatus, including: a changed amount estimating unit which estimates a changed amount of a pilot symbol due to interference of a data symbol which is adjacent to a predefined position of the pilot symbol; and a symbol generating unit which generates the pilot symbol in consideration of the estimated changed amount.