STORM Waveform Synthesis for Low PAPR Wireless Transmission
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Solution Overview
Problem
Existing wireless transmission signals, particularly OFDM and SC-FDM signals, suffer from high Peak to Average Power Ratio (PAPR), which leads to significant attenuation and increased complexity in equipment design, resulting in reduced communication link coverage and higher costs.
Innovation Solution
The SynThesis Of a neaR-constant Modulus (STORM) technique generates low-PAPR signals by complementing primary signals with auxiliary signals, using carefully constructed primary and auxiliary pulse shapes, where the auxiliary signal's power is significantly smaller than the primary signal's power, to increase amplitude constancy and reduce PAPR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If OFDM or SC-FDM signals are used for wireless transmission, then throughput and bandwidth utilization are improved, but Peak to Average Power Ratio (PAPR) increases significantly
Solution Approach 1:
The transmitted signal is segmented into multiple components: a primary signal carrying the main data and multiple auxiliary signals (first auxiliary signal, second auxiliary signal, etc.) that compensate for amplitude variations. Each signal component is processed and combined to achieve low PAPR while maintaining the throughput benefits of OFDM/SC-FDM.
Solution Approach 2:
Auxiliary signals act as intermediary elements that mediate between the high-PAPR primary signal and the power amplifier. These auxiliary signals are designed to cancel out the peaks in the primary signal, thereby reducing the overall PAPR without significantly impacting the main data transmission.
2Productivity
If high PAPR signals are transmitted, then bandwidth utilization is improved, but signal attenuation increases and link coverage is reduced
Solution Approach 1:
The signal is divided into primary and auxiliary components that can be independently optimized. The auxiliary signals are specifically designed to address amplitude variations without affecting the bandwidth utilization of the primary signal, thereby maintaining both high bandwidth efficiency and reliable link coverage.
Solution Approach 2:
The invention changes the amplitude parameter of the transmitted signal by adding auxiliary signals that compensate for peaks. This parameter modification reduces signal attenuation in the power amplifier and extends link coverage while preserving the bandwidth utilization characteristics of OFDM/SC-FDM.
3Device complexity
If power amplifiers operate with high PAPR signals, then equipment complexity is reduced, but power efficiency decreases due to required back-off
Solution Approach 1:
The auxiliary signals are generated and combined with the primary signal before amplification. This preliminary action pre-compensates for amplitude variations, allowing the power amplifier to operate more efficiently without requiring significant back-off, thereby improving power efficiency while maintaining equipment simplicity.
Solution Approach 2:
The auxiliary signals are generated from the same primary sequence through deterministic processing, making the system self-sufficient. The low-PAPR signal structure serves the dual purpose of reducing power amplifier back-off and maintaining spectral containment, eliminating the need for additional complex equipment.
4Stability 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 are generated by applying specific parameter transformations to the primary sequence, such as phase rotations and cyclic shifts. These parameter changes create signals with complementary amplitude characteristics that improve overall amplitude constancy while keeping the processing relatively simple and systematic.
Data Source
Figure 1
Figure 2A~2C
Figure 3A
AI summary
A transmitter, comprising a processor adapted to convert a primary sequence of modulation symbols into a primary signal, using a primary pulse shape, convert an auxiliary sequence of modulation symbols, created from the primary sequence, to an auxiliary signal using an auxiliary pulse shape and create a joint output signal based on the primary signal and on the auxiliary signal.