5G Uplink Waveform Shaping for Low-PAPR Signal Transmission
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing the peak-to-average power ratio (PAPR) of signals, particularly in 5G communication systems, which affects the coverage and performance of IoT devices due to high PAPR leading to distortion and increased power consumption.
Innovation Solution
The method involves selectively applying spectrum shaping and discrete Fourier transform (DFT) spreading at the transmitting end of the wireless communication system, using time domain cyclic filtering or DFT-s-OFDM to reduce PAPR without additional frequency resources, thereby improving data rate and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional wireless communication signals are transmitted without PAPR reduction, then data rate and coverage are maintained at baseline levels, but signal distortion increases and power consumption rises due to high peak-to-average power ratio
Solution Approach 1:
The patent applies parameter changes by modifying the signal waveform parameters through spectrum shaping filtering and DFT spreading operations. These transformations change the statistical properties of the signal to reduce PAPR while maintaining data transmission functionality, directly addressing the contradiction between power consumption and signal distortion
Solution Approach 2:
The patent introduces intermediary processing stages (spectrum shaping filter and DFT spreader) between the modulator and the channel. These intermediaries transform the signal into a form with lower PAPR before transmission, mediating between the original high-PAPR signal and the power amplifier to reduce distortion and power consumption
2Loss of energy
If PAPR reduction techniques are applied to improve power efficiency, then power consumption and distortion are reduced, but system complexity increases due to additional signal processing operations
Solution Approach 1:
The patent employs universal signal processing blocks (spectrum shaping filter and DFT spreader) that can be applied across different wireless communication scenarios and device types. These multi-functional components reduce PAPR while also providing spectral shaping and spreading capabilities, thereby managing complexity through standardized operations
Solution Approach 2:
The patent replaces complex mechanical or hardware-based PAPR reduction methods with digital signal processing operations. By substituting digital filtering and transformation operations for analog or hardware-intensive solutions, the system achieves PAPR reduction with manageable computational complexity
3Reliability
If additional frequency resources are allocated to reduce PAPR, then signal quality and coverage are improved, but available bandwidth and data rate capacity are reduced
Solution Approach 1:
The patent changes the temporal and spectral parameters of the signal through filtering and spreading operations, rather than allocating additional frequency resources. This parameter transformation improves signal quality and reduces PAPR while maintaining the original bandwidth allocation, thus preserving data rate capacity
Solution Approach 2:
The patent addresses PAPR reduction by operating in the time-frequency domain through transformation operations rather than allocating additional frequency dimensions. The DFT spreading and spectrum shaping manipulate the signal in transformed domains, improving quality without consuming additional spectral resources
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5G communication system for supporting higher data rates beyond a 4G system with an IoT technology. The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present disclosure can reduces a peak-to-average power ration (PAPR) by performing time domain cyclic filtering. Further, a data rate or coverage can be improved by selectively transmitting transmission waveforms through cyclic prefix (CP)-orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform-spread-OFDM (DFT-s-OFDM).