RF Sensing Waveform Design for 5G Receiver Retuning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems, particularly in the context of 5G, face challenges in efficiently transitioning between communication and radio frequency (RF) sensing operations due to differences in bandwidth and power levels.
Innovation Solution
The method involves transmitting a first radio frequency signal with a first bandwidth and power level, followed by a second radio frequency signal with a larger bandwidth and higher power level, and then transmitting RF sensing signals using the same increased bandwidth and power level. This approach allows for the use of front-loaded training symbols and a scalable cyclic prefix to facilitate receiver tuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the bandwidth and power level are increased for RF sensing signals, then the sensing performance and detection capability are improved, but the receiver requires more time to retune components which reduces operational efficiency
Solution Approach 1:
The patent applies preliminary action by transmitting a second RF signal with increased bandwidth and power level before transmitting the RF sensing signals. This pre-adjusts the receiver components to the required settings for sensing operations, so that when the sensing signals arrive, the receiver is already tuned and ready, minimizing retuning time while maintaining high sensing performance
Solution Approach 2:
The patent implements dynamics by making the bandwidth and power level adjustable and time-varying. The system dynamically transitions from a first RF signal with lower bandwidth/power to a second RF signal with higher bandwidth/power, and then to RF sensing signals. This dynamic adjustment allows the receiver to adapt its tuning requirements over time, reducing the retuning penalty when switching to high-performance sensing mode
2Reliability
If separate transmission configurations are used for communication and RF sensing signals, then each signal type can be optimized independently, but the system complexity and number of required configurations increase
Solution Approach 1:
The patent applies universality by designing a multi-functional transmission system that can operate in multiple modes: communication mode (first RF signal), transition mode (second RF signal), and sensing mode (RF sensing signals). The same transmission apparatus and signal processing chain are used for all modes, with only the signal parameters (bandwidth, power, modulation) being adjusted. This reduces system complexity compared to having separate dedicated hardware for each function while maintaining optimized performance for each signal type
Data Source
AI summary
Techniques are provided for generating radio frequency (RF) sensing waveforms to enable receiver training in cellular based RF sensing applications. An example method of transmitting a RF sensing signal includes transmitting a first radio frequency signal utilizing a first bandwidth at a first transmit power level, transmitting a second radio frequency signal utilizing a second bandwidth at a second transmit power level, wherein the second bandwidth is larger than the first bandwidth and the second transmit power level is greater than the first transmit power level, and transmitting one or more radio frequency sensing signals utilizing the second bandwidth and the second transmit power level.