PAPR Reduction via Pulse Shaping in Wireless Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in reducing the peak-to-average power ratio (PAPR) of signals, which affects power amplifier efficiency and signal distortion.
Innovation Solution
The implementation of a pulse shaping operation using a frequency domain spectrum shaping (FDSS) filter, combined with discrete Fourier transform (DFT) and inverse fast Fourier transform (IFFT) operations, to extend the symbol block and reduce PAPR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional signal transmission is used without pulse shaping, then the system is simpler to implement, but the peak-to-average power ratio (PAPR) is high causing power amplifier inefficiency and signal distortion
Solution Approach 1:
The pulse shaping filter is applied in advance to the modulated symbols before OFDM modulation, pre-conditioning the signal to reduce PAPR. This preliminary action modifies the signal characteristics proactively rather than reacting to high PAPR after modulation, thereby improving power amplifier efficiency while maintaining manageable system complexity
Solution Approach 2:
A pulse shaping filter serves as an intermediary component between the modulation stage and the OFDM modulation stage. This intermediary element smooths the signal transitions and reduces spectral leakage, thereby lowering PAPR without requiring fundamental changes to the overall system architecture, thus balancing energy efficiency with implementation complexity
2Object-generated harmful factors
If pulse shaping operation is applied to reduce PAPR, then power amplifier efficiency improves and signal distortion reduces, but the system complexity increases due to additional signal processing steps
Solution Approach 1:
The pulse shaping filter is applied in advance to the modulated symbols before OFDM modulation, pre-conditioning the signal to reduce PAPR. This preliminary action modifies the signal characteristics proactively rather than reacting to high PAPR after modulation, thereby improving power amplifier efficiency while maintaining manageable system complexity
Solution Approach 2:
A pulse shaping filter serves as an intermediary component between the modulation stage and the OFDM modulation stage. This intermediary element smooths the signal transitions and reduces spectral leakage, thereby lowering PAPR without requiring fundamental changes to the overall system architecture, thus balancing energy efficiency with implementation complexity
Data Source
AI summary
Methods and apparatuses for PAPR reduction based on a pulse shaping operation in a wireless communication system. A method of operating a UE includes: converting, using a DFT, a modulated block of data symbols to a first symbol block in a frequency domain; extending, based on a spectral extension ratio associated with extended subcarriers (Nse), the first symbol block to a second symbol block with a length that is identified based on a number of scheduled subcarriers (NSC), wherein the second symbol block is symmetrically extended DFT symbol block; generating, using an FDSS filter with a number of tap values (NP), third symbol block based on the second symbol block that is symmetrically extended DFT symbol block; mapping the generated third symbol block to the NSC; generating, based on the mapped third symbol block, OFDM symbols in a time domain using an IFFT; and transmitting, to a BS, signals including the OFDM symbols.