UWB Signal Configuration for Ranging Accuracy
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, face challenges in achieving accurate and efficient ranging and sensing using Ultra-Wideband (UWB) technology, due to limitations in signal configuration and synchronization methods.
Innovation Solution
The proposed solution involves an apparatus and method that determines whether to transmit an ultra-wideband physical-layer signal with a first configuration or a second configuration based on the application, using a transceiver to transmit the signal. This approach allows for customized signal configurations for ranging and sensing applications, enhancing accuracy and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single fixed configuration is used for UWB physical-layer signals, then device complexity is reduced, but ranging accuracy and sensing capability deteriorate
Solution Approach 1:
The patent implements dynamic signal configuration by enabling the UWB transceiver to switch between multiple physical-layer signal configurations (e.g., different subcarrier spacings, cyclic prefix lengths, FFT sizes) based on the specific ranging or sensing application requirements. This allows the system to adapt signal parameters in real-time to optimize ranging accuracy for different scenarios such as indoor positioning, vehicle-to-vehicle ranging, or impulse radio applications.
Solution Approach 2:
The patent changes physical signal parameters including subcarrier spacing, cyclic prefix duration, FFT size, and windowing functions according to different application needs. For example, larger FFT sizes and longer cyclic prefixes may be used for multipath-rich environments to improve timing estimation accuracy, while smaller configurations may be used for low-latency applications.
2Measurement precision
If UWB signals are used for both synchronization and ranging, then device complexity is reduced, but measurement precision deteriorates due to signal energy dispersion
Solution Approach 1:
The patent segments the UWB signal into distinct functional portions: a synchronization portion (e.g., synchronization preamble, training sequences) and a ranging portion (e.g., data-carrying symbols, ranging reference signals). Each portion is optimized with different configurations and energy allocations - the synchronization portion uses robust, repetition-heavy designs for reliable timing/frequency acquisition, while the ranging portion uses high-precision configurations for accurate distance measurement.
Solution Approach 2:
The patent introduces an intermediary configuration layer that coordinates between synchronization and ranging functions. The system first establishes synchronization using dedicated synchronization signals, then transitions to ranging measurements using separately optimized ranging signals. This intermediary process ensures that synchronization requirements do not compromise ranging precision and vice versa.
Data Source
AI summary
An example signal transfer method includes: determining, at a first apparatus, whether to transmit an ultra-wideband physical-layer signal with a first configuration or a second configuration based on an application for transfer of the ultra-wideband physical-layer signal, the first configuration being different from the second configuration; and transmitting, from the first apparatus to a second apparatus, the ultra-wideband physical-layer signal.[Continued on next page]