Peak-to-Average Ratio Reduction via Cancellation Pulse Generation
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Solution Overview
Problem
In wireless communication systems, high Peak-to-Average Ratio (PAR) signals require large input back-off for high power amplifiers, leading to inefficient amplification and a need for an effective method to reduce PAR.
Innovation Solution
An apparatus and method that generate a cancellation pulse using the symmetry property of a basic waveform to attenuate peak components of a signal, reducing the processing time for generating the cancellation pulse and enabling efficient reduction of PAR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a high power amplifier is used to amplify high PAR signals, then the signal can be transmitted, but the amplification efficiency is low due to large input back-off
Solution Approach 1:
The invention generates a cancellation pulse before the peak component occurs, which is designed to cancel the peak when added to the original signal. This preliminary action reduces the PAR before amplification, allowing the power amplifier to operate more efficiently without excessive back-off, thereby improving amplification efficiency and reducing power loss.
2Productivity
If a cancellation pulse is generated using conventional methods, then the peak component can be attenuated, but the processing time is long and cannot handle continuously generated peaks
Solution Approach 1:
The cancellation pulse generation process is segmented into two parts: a first part generated in real-time and a second part generated by time-reversing the first part. This segmentation allows the system to generate the complete cancellation pulse more quickly by reusing the computational work already done for the first part, thereby reducing processing time and enabling handling of continuously generated peaks.
Solution Approach 2:
The invention utilizes the periodic or repeating nature of the cancellation pulse structure by generating the second part through time-reversal of the first part. This periodic action pattern allows the system to efficiently generate complete cancellation pulses for continuously occurring peaks without repeating the full generation process each time, thus improving productivity and reducing time loss.
Data Source
AI summary
The purpose of the present invention is to reduce the Peak-to-Average Ratio (PAR) of a transmission signal. A transmission device includes a generation part for generating a cancellation pulse corresponding to a peak component of a transmission signal, and a cancellation part for attenuating the peak component using the cancellation pulse. In addition, the present invention includes some embodiments other than the aforesaid embodiment.