Peak Reduction Tone Allocation for 5G PAPR Control
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing peak-to-average power ratio (PAPR) in 5G NR technology, leading to inefficient power amplifier operations and resource usage, particularly in scenarios involving high PAPR signals.
Innovation Solution
The implementation of a method that uses peak reduction tones (PRTs) allocated based on optimal Golomb rulers or perfect rulers to generate peak cancellation signals, where one set of PRTs does not overlap with data tones and another set overlaps with data tones but not reserved tones, to reduce signal peaks and improve PAPR, along with signal regeneration techniques at the receiving device to restore the peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional PAPR reduction techniques are used, then signal peaks are reduced, but power amplifier efficiency deteriorates due to non-saturated operations
Solution Approach 1:
The patent segments the frequency spectrum into different tone types (data tones, reserved tones, and peak reduction tones) and applies different signal processing strategies to each segment. PRTs are specifically allocated to handle peak reduction while data tones carry information, allowing independent optimization of each segment's function.
Solution Approach 2:
The patent introduces peak reduction tones as intermediary elements that mediate between the data signal and the power amplifier. These PRTs act as a buffer to cancel signal peaks through noise shaping, allowing the power amplifier to operate in a more efficient regime without directly compromising the data signal integrity.
2Object-affected harmful factors
If peak reduction tones are allocated, then PAPR is reduced, but resource usage efficiency deteriorates due to tone overhead
Solution Approach 1:
The patent changes the parameter of tone allocation by using optimal Golomb rulers to determine the positions of peak reduction tones. This mathematical approach optimizes the spacing and distribution of PRTs across the frequency spectrum, achieving effective PAPR reduction with minimal tone overhead compared to uniform or random allocation schemes.
3Reliability
If signal peaks are reduced, then power amplifier operations improve, but signal quality deteriorates due to distortion and EVM
Solution Approach 1:
The patent extracts the peak reduction function from the data signal by allocating separate peak reduction tones. This allows the peak cancellation operation to be performed independently on PRTs without directly modifying data tones, thereby maintaining signal quality while achieving PAPR reduction. The data signal integrity is preserved by keeping data tones separate from the peak reduction operation.
Data Source
AI summary
A transmitting device communicates with a receiving device an indication to apply PAPR reduction for a data transmission. The transmitting device applies a first PAPR reduction signal and a second PAPR reduction signal to the data transmission to reduce at least one signal peak of the data transmission to yield a transmission signal, where the first PAPR reduction signal includes a first set of PRTs that does not overlap with data tones and the second PAPR reduction includes a second set of PRTs that overlaps with the data tones and does not overlap with reserved tones. The transmitting device transmits the transmission signal to the receiving device.