Tone Reservation PAPR Reduction via Deterministic Sampling
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Solution Overview
Problem
Contemporary wireless communication systems employing orthogonal frequency division multiplexing (OFDM) face challenges with high peak-to-average power ratio (PAPR), which can lead to waveform distortion and reduced transmission efficiency due to power amplifier saturation.
Innovation Solution
The implementation of a tone reservation (TR) algorithm that selects a subset of tones as peak reduction tones (PRTs) using deterministic pseudo-random tone selection methods such as quadratic sampling, cubic sampling, or Fibonacci-type sampling, allowing for the reduction of PAPR by multiplexing a PAPR reduction waveform with the data waveform, thereby optimizing power amplification and minimizing distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If OFDM is used for wireless transmission, then spectral efficiency and data rate are improved, but peak-to-average power ratio increases causing waveform distortion
Solution Approach 1:
The patent extracts the harmful peak power components from the OFDM signal by identifying and isolating tones that contribute most to PAPR. These problematic tones are then treated separately through selective muting or power reduction, removing the distortion-causing elements while preserving the beneficial high-data-rate characteristics of OFDM transmission.
Solution Approach 2:
The patent changes the power allocation parameters across different subcarriers/tones in the OFDM signal. By dynamically adjusting the power levels of individual tones based on their contribution to PAPR, the system reduces peak power while maintaining average power efficiency, thereby preventing waveform distortion without sacrificing data rate.
2Power
If power amplifier operates at high power to increase transmission range, then signal strength is improved, but waveform distortion increases due to saturation
Solution Approach 1:
The patent applies preliminary action by pre-processing the OFDM signal to reduce PAPR before amplification. Through techniques such as selective tone muting, clipping, or filtering applied in advance, the signal peaks are reduced prior to power amplifier operation, enabling the amplifier to operate in its linear region without saturation-induced distortion while maintaining high transmission power.
Solution Approach 2:
The patent converts the harmful effect of high PAPR into a benefit by using the identified peak-causing tones constructively. Instead of simply reducing their power, the system uses iterative algorithms to shape these tones in a way that reduces overall PAPR while maintaining signal integrity, effectively turning the problematic high-power components into useful elements for distortion-free amplification.
3Object-affected harmful factors
If PAPR reduction techniques are applied, then waveform distortion is reduced, but transmission efficiency may decrease
Solution Approach 1:
The patent applies partial action by selectively applying PAPR reduction only to the necessary portions of the signal. Instead of processing the entire OFDM signal uniformly, the system identifies and treats only the specific tones or time segments that contribute most to PAPR, reducing computational overhead and maintaining transmission efficiency while achieving adequate distortion reduction.
Solution Approach 2:
The patent implements self-service through adaptive algorithms that automatically adjust PAPR reduction parameters based on channel conditions and signal characteristics. The system monitors its own performance and dynamically optimizes the balance between distortion reduction and transmission efficiency without external intervention, maintaining high productivity while preventing waveform distortion.
Data Source
AI summary
Aspects of the disclosure relate to techniques for peak-to-average power ratio (PAPR) reduction based on a tone reservation (TR) algorithm. For a TR algorithm, a suitable subset of tones from among a full set of tones in a given resource allocation are reserved for use as peak reduction tones (PRT). An apparatus, such as a wireless communication device, selects a set of PRTs based on a deterministic pseudo-random tone selection algorithm, such as quadratic sampling, cubic sampling, or Fibonacci-type sampling. The apparatus determines a PAPR reduction waveform for transmission on the PRTs and transmits a data waveform multiplexed with the PAPR reduction waveform on resources corresponding to the resource allocation. Other aspects, embodiments, and features are also claimed and described.