Half-Duplex Monostatic Waveforms for Self-Interference-Free RF Sensing
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently performing RF sensing operations due to self-interference issues in full duplex operations, which are not compatible with all sensing nodes, particularly for long-range and short-range target sensing.
Innovation Solution
Implementing half-duplex monostatic RF sensing using OFDM waveforms and time division multiplexing to enable joint communication and RF sensing, allowing for reduced complexity and avoiding self-interference, with configurations compatible with both long and short-range sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full-duplex RF sensing is used to enable simultaneous transmission and reception, then sensing capability is improved, but self-interference and system complexity increase
Solution Approach 1:
The patent implements half-duplex monostatic sensing by periodically alternating between transmission and reception phases. The waveform is designed with specific periodicity parameters that define when the wireless node transmits sensing signals and when it receives reflected signals, avoiding simultaneous operation and thus eliminating self-interference while maintaining sensing capability.
Solution Approach 2:
Instead of using full-duplex operation with complex self-interference cancellation, the patent inverts the approach by using half-duplex operation where the node completely stops transmitting during reception phases and stops receiving during transmission phases. This inversion simplifies the system by eliminating the need for complex self-interference management mechanisms.
2Productivity
If spectral efficiency is enhanced to support more connections, then network capacity is improved, but waveform design complexity and latency increase
Solution Approach 1:
The patent designs waveforms that serve dual purposes: they function as both communication signals and RF sensing signals. By configuring waveforms with specific time domain parameters and periodicity that satisfy both communication protocol requirements and sensing measurement requirements, the system achieves spectral efficiency enhancement while avoiding the need for separate dedicated sensing waveforms, thus limiting complexity increase.
Solution Approach 2:
The patent adjusts waveform parameters such as time domain duration, periodicity, and numerology configurations to optimize for both high spectral efficiency and reduced latency. By carefully selecting parameter values that align with 5G NR standards while meeting sensing performance requirements, the system enhances network capacity without excessive complexity.
3Measurement precision
If waveform duration is extended to improve sensing accuracy, then measurement precision is improved, but latency increases
Solution Approach 1:
The patent implements dynamic waveform configuration where the time domain parameters and periodicity are adjustable based on specific sensing requirements. Rather than using fixed extended-duration waveforms, the system dynamically selects waveform parameters that provide sufficient measurement precision for the current application while minimizing latency, allowing adaptation to different sensing scenarios.
Data Source
AI summary
Techniques are provided for defining waveforms for half-duplex monostatic radio frequency (RF) sensing. An example method for performing RF sensing operations includes receiving assistance data for radio frequency sensing operations including at least a waveform time domain parameter and a waveform periodicity parameter, and performing radio frequency sensing operations utilizing the waveform time domain parameter and the waveform periodicity parameter.