Wireless Transmission Device DFT-S-OFDM Clipping Optimization
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Solution Overview
Problem
The DFT-S-OFDM method and its clipped variant face issues with reduced frequency resource utilization due to clipping, leading to increased error ratio properties, which affects communication systems.
Innovation Solution
A wireless transmission device and method that groups time domain signals and applies different communication parameters, including clipping ratios, to manage error correction and power allocation, thereby minimizing error ratio degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If clipping processing is applied to DFT-S-OFDM signals, then frequency resource utilization is improved, but error ratio increases
Solution Approach 1:
The patent segments the time domain signal into multiple groups before applying clipping processing. Different groups can have different clipping ratios or clipping characteristics, allowing selective frequency resource allocation. This segmentation enables the system to optimize frequency utilization in certain groups while preserving signal integrity in others, thereby resolving the contradiction between frequency resource utilization and error ratio.
Solution Approach 2:
The patent applies different clipping ratios or clipping parameters to different groups of time domain signals. Instead of uniform clipping, local quality is optimized by tailoring clipping characteristics to specific signal groups based on their importance, channel conditions, or error correction requirements. This allows maximum frequency resource utilization in groups where clipping is beneficial while maintaining low error ratios in groups where signal integrity is critical.
2Productivity
If clipping ratio is increased, then frequency resource allocation efficiency is improved, but signal quality deteriorates
Solution Approach 1:
The patent dynamically adjusts clipping ratios based on varying conditions such as channel quality, signal power, or error correction requirements. The clipping ratio is not fixed but adapts in real-time to optimize the balance between frequency resource allocation efficiency and signal quality. This dynamic adjustment allows the system to achieve high allocation efficiency when conditions permit while maintaining signal quality when needed.
Solution Approach 2:
The patent changes the clipping parameter (clipping ratio) as a variable control mechanism. By adjusting this parameter differentially across signal groups or over time, the system optimizes frequency resource allocation efficiency while preserving signal quality. The parameter change allows flexible trade-off between efficiency and quality based on instantaneous system conditions.
3Device complexity
If uniform clipping is applied to all signal groups, then processing complexity is reduced, but communication efficiency decreases
Solution Approach 1:
The patent segments signals into multiple groups with different clipping characteristics, which increases processing complexity slightly but enables significant communication efficiency improvements. The segmentation allows optimized frequency resource allocation and error correction for each group, resulting in overall higher system throughput and better spectral utilization.
Solution Approach 2:
The patent applies local quality optimization by treating different signal groups differently with tailored clipping parameters. This approach increases processing complexity marginally while dramatically improving communication efficiency through optimized frequency resource allocation and enhanced error correction performance for each local group.
Data Source
AI summary
A wireless transmission device is provisioned with a communication parameter setting unit configured to group time domain signals and setting different communication parameters for each group, a clipping unit configured to perform a clipping processing in the frequency domain on at least a portion of groups of the time domain signal, and a transmitting unit configured to transmit the time domain signal after the clipping processing.