STORM Waveform PAPR Reduction via Auxiliary Signal Segmentation
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Solution Overview
Problem
Current wireless transmission signals, particularly OFDM-based signals, face high Peak to Average Power Ratio (PAPR) issues, leading to increased complexity and cost in transmitter and receiver design, as well as reduced output power due to the need for high power back-off in non-linear power amplifiers.
Innovation Solution
The implementation of a SynThesis Of a neaR-constant Modulus (STORM) signal technique, which uses a universal pulse shape and auxiliary signals to create a joint output signal with reduced PAPR, by combining primary and auxiliary signals generated using altered versions of the universal pulse shape, thereby simplifying transmitter and receiver operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If OFDM-based signals are used for wireless transmission, then bandwidth utilization and throughput are improved, but Peak to Average Power Ratio (PAPR) increases leading to higher transmitter complexity and cost
Solution Approach 1:
The transmitted signal is segmented into multiple components: a primary signal carrying data and multiple auxiliary signals. Each component is modulated and transmitted separately, allowing the receiver to process and combine them. This segmentation enables PAPR reduction while maintaining high throughput by distributing information across multiple signal components with lower individual peak powers.
Solution Approach 2:
Auxiliary signals act as intermediaries between the primary signal and the transmission channel. These auxiliary signals carry additional information and help shape the overall signal characteristics to reduce PAPR. The receiver uses these intermediary signals to reconstruct the original data while maintaining signal integrity and reducing peak power requirements.
2Reliability
If high power back-off is applied in non-linear power amplifiers to reduce PAPR effects, then signal distortion is reduced, but output power decreases
Solution Approach 1:
By segmenting the signal into primary and auxiliary components, each with lower peak power requirements, the system can operate power amplifiers at higher efficiency points without excessive peak power excursions. This maintains signal quality while increasing average output power capability.
Solution Approach 2:
The invention changes the statistical parameters of the transmitted signal by using auxiliary signals with specific power levels and phase relationships. This transforms the composite signal's power distribution to have reduced peak-to-average ratio, allowing power amplifiers to operate closer to their maximum efficient output power while maintaining signal fidelity.
3Stability of the object's composition
If auxiliary signals are added to reduce PAPR, then amplitude constancy is improved, but signal processing complexity increases
Solution Approach 1:
The auxiliary signals serve multiple functions simultaneously: they carry additional data information, shape the composite signal's amplitude envelope to improve constancy, and enable power amplifier efficiency improvement. This multi-functionality reduces the need for separate mechanisms, thereby limiting the increase in processing complexity.
Solution Approach 2:
The auxiliary signals are pre-modulated and prepared at the transmitter with specific power levels and phase relationships before transmission. This preliminary action allows the composite signal to achieve improved amplitude constancy without requiring complex real-time processing at the receiver, as much of the signal structure is predetermined.
Data Source
AI summary
A transmitter includes a processor configured to convert a primary sequence of modulation symbols into a primary signal using a universal pulse shape. The processor is further configured to convert an auxiliary sequence of modulation symbols, created from the primary sequence, to an auxiliary signal using an altered version of the universal pulse shape. In addition, the processor is configured to combine the primary signal and the auxiliary signal to create a joint output signal.