Adaptive FTN Transmission Control for Symbol Interval Interference
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Solution Overview
Problem
Faster-than-Nyquist (FTN) modulation schemes improve frequency use efficiency but introduce inter-symbol interference, increasing the load on reception apparatuses and potentially deteriorating communication quality due to the need for special signal processing.
Innovation Solution
An apparatus and method that adaptively adjust symbol or subcarrier intervals based on communication environment conditions, using a control unit to manage symbol and subcarrier intervals for FTN sequences, allowing for efficient frequency use without excessive processing load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If FTN modulation is applied to narrow symbol intervals beyond Nyquist conditions, then frequency use efficiency is improved, but inter-symbol interference occurs and reception apparatus requires special signal processing
Solution Approach 1:
The patent applies dynamics by making the symbol interval adjustable rather than fixed. The control unit dynamically changes the symbol interval based on communication conditions, allowing the system to adapt between Nyquist and FTN modes. This resolves the contradiction by enabling the reception apparatus to handle variable intervals without requiring complex special processing for all conditions.
Solution Approach 2:
The patent changes the parameter of symbol interval from a fixed value to a variable parameter controlled by communication conditions. By adjusting this parameter, the system can achieve high frequency efficiency when needed while maintaining compatibility with standard reception processing under normal conditions, thus resolving the complexity issue.
2Productivity
If symbol intervals are narrowed in FTN to improve frequency use efficiency, then more data can be transmitted, but the processing load on reception apparatus increases
Solution Approach 1:
The control unit dynamically adjusts symbol intervals based on communication conditions, allowing the system to operate at high data rates only when necessary. This reduces the average processing load on reception apparatus while maintaining high productivity capability when needed.
Solution Approach 2:
By changing the symbol interval parameter adaptively, the system optimizes the balance between data transmission rate and processing load. The parameter is adjusted to match communication conditions, achieving high throughput when possible while reducing processing requirements under less favorable conditions.
3Productivity
If MIMO antennas are increased to improve communication capacity, then data rate increases, but physical installation restrictions are reached
Solution Approach 1:
The patent changes the approach from increasing physical antenna数量 to adjusting temporal parameters (symbol intervals). By narrowing symbol intervals through FTN, the system achieves higher communication capacity without adding more physical antennas, thus avoiding installation restrictions.
Data Source
AI summary
There is provided an apparatus including a communication unit that performs radio communication and a control unit that controls transmission from the communication unit to a terminal by narrowing at least one of a symbol interval of a complex symbol sequence in a time direction and a subcarrier interval of the complex symbol sequence in a frequency direction, the complex symbol sequence being converted from a bit sequence, the symbol interval and the subcarrier interval being set on a basis of a predetermined condition.