Chirp Signal Sets for Doppler and Range Estimation
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in utilizing bandwidth for both communication and sensing functions, particularly in detecting moving objects, as high bandwidth chirp signals are often used without prior detection, leading to suboptimal resource allocation and processing power utilization.
Innovation Solution
The method involves transmitting first set chirp signals with a limited bandwidth for initial detection of moving objects and subsequent transmission of second set chirp signals with a larger bandwidth for accurate Doppler and range determination, optimizing bandwidth use by limiting high bandwidth signals to only after object detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high bandwidth chirp signals are used for sensing, then measurement precision is improved, but loss of energy increases
Solution Approach 1:
The system performs preliminary detection using low bandwidth chirp signals before deploying high bandwidth signals. This preliminary action identifies potential moving objects, ensuring that high bandwidth resources are only consumed when necessary for accurate measurement, thus resolving the contradiction between measurement precision and energy loss.
Solution Approach 2:
The patent applies different bandwidth qualities to different sensing scenarios: low bandwidth for initial detection and high bandwidth for confirmed target measurement. This local differentiation of signal quality based on detection needs optimizes the balance between measurement precision and bandwidth resource consumption.
2Measurement precision
If high bandwidth chirp signals are transmitted continuously, then measurement precision is improved, but loss of time increases
Solution Approach 1:
Low bandwidth chirp signals are transmitted first as a preliminary detection phase. Only after detecting a moving object does the system switch to high bandwidth signals for accurate measurement. This sequential approach prevents unnecessary transmission of high bandwidth signals, reducing time loss while maintaining measurement precision when needed.
Solution Approach 2:
The system employs periodic switching between low and high bandwidth signal transmission based on detection requirements. This periodic action pattern ensures that high bandwidth signals are transmitted only in periods when moving objects are detected, optimizing both time efficiency and measurement accuracy.
3Loss of energy
If low bandwidth chirp signals are used, then loss of energy is reduced, but measurement precision deteriorates
Solution Approach 1:
Low bandwidth chirp signals serve as a preliminary detection mechanism to identify the presence of moving objects. This preliminary use of low bandwidth signals conserves energy during the detection phase, while the system reserves the capability to switch to high bandwidth signals when measurement precision becomes necessary.
Solution Approach 2:
The system dynamically adjusts bandwidth allocation based on detection results. It transitions from low bandwidth mode for energy-efficient detection to high bandwidth mode when moving objects are detected and accurate measurement is required. This dynamic adaptation resolves the contradiction between energy conservation and measurement precision.
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 enhances spectral efficiency by reserving high bandwidth chirp signals for instances where moving objects have been detected, effectively utilizing radio resources and processing power for accurate sensing while maintaining communication capabilities.
Implementation Method 1
Chirp signal sets for doppler and range estimation in a cellular communication system
Data Source
AI summary
In an aspect, a network device may transmit one or more first sets of first chirp signals in a first bandwidth of an allocated frequency range assigned to the network device for data communications and sensing signals. The network device may transmit one or more second sets of second chirp signals in a second bandwidth of the allocated frequency range, wherein the second bandwidth is larger than the first bandwidth.