UWB Kernel Pre-Correlation for Signal Detection
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Solution Overview
Problem
Ultra Wide Band (UWB) communication systems face limitations in operating range due to the rapid reduction of the safety margin between true and false correlation peaks caused by propagation and multi-path losses, making it difficult to distinguish UWB signals from noise.
Innovation Solution
Implementing a pre-correlation step using a short UWB pulse, referred to as a UWB kernel, before correlating the received signal with a pseudo-random noise (PRN) code to enhance the safety margin between true and false correlation peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the UWB signal is transmitted over distance, then the coverage range is extended, but the safety margin between true and false correlation peaks quickly vanishes due to propagation loss and multi-path loss
Solution Approach 1:
The patent applies pre-correlation with a UWB kernel pulse before the main correlation with the PRN code. This preliminary action enhances the signal components while suppressing noise and interference early in the detection process, thereby maintaining a sufficient safety margin between true and false correlation peaks even at extended transmission distances where propagation and multi-path losses occur
2Reliability
If the PRN code length is increased to improve the safety margin, then the detection reliability improves, but the processing time and system complexity increase
Solution Approach 1:
The patent segments the correlation process into two distinct stages: first pre-correlation with a short UWB kernel pulse, then correlation with the PRN code. This segmentation allows the system to achieve reliable detection with a moderate-length PRN code by preparing the signal in advance through kernel correlation, thereby reducing the required PRN code length and associated processing complexity while maintaining detection reliability
3Reliability
If the PRN code length is increased to improve the safety margin, then the detection reliability improves, but the processing time increases
Solution Approach 1:
By performing pre-correlation with the UWB kernel pulse before the main PRN code correlation, the system prepares the signal in advance, enhancing signal components and suppressing noise. This preliminary processing reduces the effective processing burden during the main correlation stage, allowing for faster detection while maintaining the safety margin between true and false correlation peaks
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
Significantly improves the signal-to-noise ratio, allowing for the detection of weak UWB signals in noisy conditions and extending the operational range of UWB communication systems.
Implementation Method 1
A received signal is first correlated with a 'UWB kernel' before being correlated with the PRN code. The UWB kernel is a very short UWB pulse having the same pulse shape as the UWB signal pulses.
Implementation Method 2
By correlating a received signal with the same code in a UWB receiver, the UWB signal train can be detected and recovered from noise.
Data Source
AI summary
A system and method is provided for improving the operating range for UWB communication systems by increasing the margin between true correlation peaks and false correlation peaks in a received UWB signal. A received signal is first correlated with a UWB kernel before being correlated with the PRN code. The UWB kernel is a very short UWB pulse having the same pulse shape as the UWB signal pulses. By pre-correlating the received signal with the UWB kernel at least once prior to correlating with the PRN code, the margin between true correlation peaks and false correlation peaks is substantially improved.