Peak Reduction Tone Power Setting for PAPR Control
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Solution Overview
Problem
Wireless communication networks face performance degradation due to signal interference and peak-to-average power ratio (PAPR) issues, leading to nonlinear power amplifier operation and spectral spreading, which affects both downlink and uplink transmissions.
Innovation Solution
The implementation of peak reduction tones (PRTs) with predetermined location sequences and magnitude/phase optimization using the SCR-TR algorithm, where the power associated with PRTs is set based on path loss to reduce PAPR, thereby improving transmission efficiency and data rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If signal amplification is increased to improve transmission performance, then data rate and capacity are improved, but PAPR increases causing power amplifier to operate in nonlinear region leading to signal distortion and spectral spreading
Solution Approach 1:
The patent introduces peak reduction tones (PRTs) as intermediary elements that act as mediators between the high-PAPR signal and the power amplifier. These PRTs are specifically designed to cancel out the peaks in the time-domain signal, thereby reducing PAPR and enabling the power amplifier to operate in its linear region while maintaining high data rates. The PRTs serve as a buffer that absorbs the harmful peak effects without compromising the main data transmission.
Solution Approach 2:
The patent dynamically adjusts the power levels of peak reduction tones based on path loss conditions between the UE and base station. By changing the power parameter of PRTs according to channel conditions, the system optimizes PAPR reduction effectiveness while minimizing interference and maximizing transmission performance. This adaptive parameter adjustment allows the system to maintain signal fidelity across varying transmission distances and channel qualities.
2Loss of energy
If peak reduction tones are added to reduce PAPR, then power amplifier efficiency is improved, but device complexity and processing requirements increase
Solution Approach 1:
The patent pre-calculates and determines the optimal power levels for peak reduction tones before transmission based on path loss measurements. This preliminary determination of PRT power levels eliminates the need for complex real-time optimization during transmission, significantly reducing processing complexity at the UE while maintaining PAPR reduction effectiveness. The path loss-based power setting is computed in advance, simplifying the overall system complexity.
3Reliability
If PRT power is increased to enhance PAPR reduction, then transmission performance is improved, but interference to other users and spectral spreading increase
Solution Approach 1:
The patent implements dynamic parameter adjustment by setting PRT power levels as a function of path loss. This ensures that PRT power is optimized for each specific transmission scenario - higher power when path loss is high (to maintain PAPR reduction effectiveness) and lower power when path loss is low (to minimize interference). This adaptive parameter change resolves the contradiction by making PRT power context-dependent rather than fixed.
Solution Approach 2:
The patent applies different power levels to different peak reduction tones based on their specific requirements and channel conditions. Rather than using a uniform power level for all PRTs, the system tailors the power allocation locally to each PRT's function and the prevailing channel conditions, thereby achieving effective PAPR reduction while minimizing overall interference to other users and reducing spectral spreading.
Data Source
AI summary
Wireless communication techniques that include techniques for setting power of peak reduction tones are discussed. A UE may receive a signal. The UE may set power associated with at least one peak reduction tone in accordance with a path loss between the UE and a base station. The path loss may be in accordance with the received signal. Other aspects and features are also claimed and described.