Dynamic Radio Waveform Configuration for 5G and 6G
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Solution Overview
Problem
In cellular wireless communication, particularly in 5G NR and 6G systems, existing radio waveforms like OFDM and DFT-S-OFDM face limitations in frequency-selective fading environments, leading to high peak-to-average power ratio (PAPR) issues and reduced coverage due to propagation attenuation, especially in higher frequency bands like terahertz frequencies.
Innovation Solution
A communication apparatus that dynamically sets a radio waveform based on the used radio frequency band, adjusting processing units such as DFT, IFFT, CP addition, and windowing to optimize transmission for each band, allowing for adaptable waveform generation suitable for different frequency bands, thereby improving throughput and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed radio waveform (e.g., OFDM or DFT-S-OFDM) is used across all frequency bands, then the system is simple to implement, but transmission performance deteriorates in high-frequency bands due to high PAPR and propagation attenuation
Solution Approach 1:
The patent applies dynamics by making the radio waveform configuration changeable according to the operating frequency band. The baseband signal processing unit dynamically selects and configures waveform parameters (such as applying DFT, IFFT, cyclic prefix addition, and windowing functions) based on whether the system operates in low-frequency or high-frequency bands, allowing optimal performance adaptation without fixed constraints
Solution Approach 2:
The patent changes physical parameters of the radio waveform based on frequency band. Specifically, it adjusts waveform parameters such as applying different windowing functions (e.g., Hann window), different cyclic prefix lengths, and different DFT/IFFT configurations for high-frequency bands compared to low-frequency bands, thereby optimizing transmission performance for each frequency range
2Area of stationary object
If conventional waveforms are used in high-frequency bands, then the apparatus design is simple, but coverage area is reduced due to propagation attenuation and high PAPR
Solution Approach 1:
The system dynamically adapts the radio waveform configuration based on the operating frequency band. For high-frequency bands where propagation attenuation is severe, the baseband signal processing unit applies optimized waveform parameters including specific windowing functions and cyclic prefix configurations that reduce PAPR and improve coverage, whereas simpler configurations are used in low-frequency bands
Solution Approach 2:
The patent changes waveform parameters specifically for high-frequency operation to improve coverage. This includes adjusting the cyclic prefix length, applying appropriate windowing functions to reduce spectral leakage and PAPR, and configuring DFT/IFFT parameters optimally for high-frequency propagation characteristics, thereby extending coverage area
3Productivity
If radio waveform is optimized for high-frequency bands, then coverage and throughput improve, but the system becomes less adaptable to different frequency bands
Solution Approach 1:
The baseband signal processing unit is designed with multi-functionality to handle different frequency bands. It can perform various signal processing operations including DFT, IFFT, cyclic prefix addition/removal, and different windowing functions, allowing it to adapt its configuration for both low-frequency and high-frequency bands while maintaining optimal throughput performance in each
Solution Approach 2:
The system maintains adaptability through dynamic reconfiguration of waveform parameters based on the operating frequency band. The baseband signal processing unit can switch between different waveform configurations (e.g., with or without DFT, different CP lengths, different windowing functions) depending on whether it operates in low-frequency or high-frequency bands, ensuring both throughput optimization and frequency band versatility
Data Source
AI summary
A communication apparatus includes: control circuitry which, in operation, makes a setting of a radio waveform of a signal according to a radio frequency band used for transmission or reception of the signal; and communication circuitry which, in operation, transmits or receives the signal based on the setting of the radio waveform.