Modified Fourier Transform for PAPR Reduction in 5G Wireless
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Solution Overview
Problem
In 5G wireless communication systems, the peak-to-average power ratio (PAPR) of signals transmitted by user equipment (UE) at the cell edge is a challenge due to amplifier performance and battery capacity limitations, which affects signal performance and coverage.
Innovation Solution
A modified Fourier transform is applied to modulation symbols with a phase shift from a reference phase change by a phase offset, reducing PAPR and enabling real multiplication calculations for filter application, thereby reducing computational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power of signals transmitted by the UE is increased to improve cell edge coverage, then the signal performance is improved, but the PAPR increases causing amplifier performance degradation and battery capacity exhaustion
Solution Approach 1:
The patent applies a modified Fourier transform with a specific phase offset parameter to change the phase characteristics of modulation symbols. This parameter change reduces the peak power variations in the time-domain signal, thereby reducing PAPR while maintaining the average power level needed for cell edge coverage, thus improving reliability without exhausting battery capacity
2Use of energy by moving object
If a modified Fourier transform with phase offset is applied to reduce PAPR, then the PAPR is reduced, but the computational complexity increases
Solution Approach 1:
The patent selects specific discrete phase offset values that simplify the modified Fourier transform computation. By constraining the phase offset to specific values, the computational complexity is reduced while still achieving PAPR reduction, thus lowering power consumption without excessive computational burden
3Device complexity
If conventional Fourier transform is applied to modulation symbols, then the transformation is simple, but the PAPR reduction performance is insufficient
Solution Approach 1:
The patent introduces a phase offset parameter to the conventional Fourier transform, creating a modified Fourier transform. This parameter modification changes the phase characteristics of the transformed signal, enabling significant PAPR reduction while maintaining computational complexity close to the conventional transform, thus achieving better PAPR performance without proportionally increasing complexity
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). A method for operating a transmission device in a wireless communication system is provided. The method includes generating modulation symbols based on a modulation scheme, generating transformed data by applying a modified Fourier transform to the modulation symbols, generating a transmission signal based on the transformed data, and transmitting the transmission signal. The modified Fourier transform applies to each of the modulation symbols an amount of phase change that is shifted from an amount of reference phase change by a phase offset.