Joint RF Sensing Waveform for Spectrally Efficient Communications
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently combining communications and radio frequency (RF) sensing using a single waveform, particularly with the increasing bandwidth requirements and diverse use cases in 5G and future cellular systems.
Innovation Solution
The implementation of a waveform, such as an orthogonal frequency-division multiplexing (OFDM) waveform, that integrates both communications instances and sensing instances, allowing for monostatic and bistatic RF sensing while efficiently utilizing frequency bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate waveforms are used for communications and RF sensing, then each function can be optimized independently, but spectral efficiency is reduced due to duplication of resources
Solution Approach 1:
The patent combines communications and RF sensing functions into a single waveform structure. The transmitted signal contains both communication data symbols and sensing reference signals that can be processed independently. This merging allows the system to achieve both communication reliability and spectral efficiency by utilizing the same frequency resources for dual purposes rather than allocating separate resources for each function.
Solution Approach 2:
The patent creates a universal waveform that serves multiple functions simultaneously. The same transmitted signal is used for both communication data transmission and RF sensing operations. The waveform structure includes communication symbols for data transmission and integrated sensing reference signals that enable target detection, ranging, and velocity measurement, making the system multi-functional without requiring separate dedicated waveforms for each purpose.
2Adaptability or versatility
If bandwidth is increased to support more use cases, then system capability is improved, but device complexity and resource management become more difficult
Solution Approach 1:
The patent segments the waveform into distinct functional components including communication data symbols and sensing reference signals. This segmentation allows independent processing and optimization of each function while maintaining a unified waveform structure. The separated components can be independently configured and managed, reducing the overall complexity of waveform management despite supporting multiple use cases and functions within the same bandwidth.
3Measurement precision
If dedicated sensing resources are allocated, then sensing accuracy is improved, but communication resources are reduced
Solution Approach 1:
The patent merges sensing reference signals with communication signals in the same waveform. The sensing reference signals are integrated within the communication frame structure, allowing them to share the same time-frequency resources. This merging enables the system to maintain sensing accuracy through dedicated reference signals while simultaneously preserving communication throughput by utilizing the same resources efficiently for both purposes rather than allocating separate dedicated sensing resources that would reduce communication capacity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables high spectral efficiency, allowing for effective joint communications and RF sensing, which is essential for future cellular systems to manage increasing bandwidth demands and diverse use cases.
Implementation Method 1
receiving, by a receiver, a first signal based on a reflection of a second signal from a target
Data Source
AI summary
Disclosed are systems and techniques for efficient joint communications and radio frequency (RF) sensing. For example, a method for communications and sensing can include receiving, by a receiver, a first signal based on a reflection of a second signal from a target, wherein the first signal comprises a waveform including a plurality of communications instances and a plurality of sensing instances. The method can include determining, using radio frequency sensing, at least one characteristic of the target based on information in at least one of the plurality of sensing instances.