UWB Signal Correlation Processing for Distance-Independent Reliability
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Solution Overview
Problem
Ultra wideband (UWB) signal processing faces challenges due to amplitude variations with emission distance, which complicates signal decoding and requires automatic gain control, especially in high-frequency applications like digital pulse interval modulation (DPIM) where sampling frequencies reach several GHz, posing difficulties in CMOS technology implementation.
Innovation Solution
A method and device that process signals by generating correlation signals or masks corresponding to varying distances, ensuring the sum of intercorrelation maxima remains constant over a distance interval, eliminating the need for automatic gain control and enabling stable signal processing without distance detection, using serial/parallel conversion and correlation processing with multiple masks to maintain signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic gain control is used to compensate for signal amplitude variations with distance, then signal processing reliability is improved, but device complexity increases
Solution Approach 1:
The patent divides the correlation processing into multiple parallel channels, each handling a specific distance interval. Instead of using a single complex automatic gain control system, the signal is segmented by distance ranges, and each segment is processed independently with its own correlation mask, simplifying the overall system architecture while maintaining reliability.
Solution Approach 2:
The patent dynamically selects different correlation masks based on the detected distance interval. The system adapts its behavior by choosing appropriate masks for different distance ranges, eliminating the need for complex automatic gain control while maintaining processing reliability across varying distances.
2Stability of the object's composition
If automatic gain control is implemented to handle amplitude variations, then signal processing stability is improved, but manufacturing difficulty increases
Solution Approach 1:
The patent segments the signal processing into multiple parallel correlation channels, each optimized for specific distance intervals. This segmentation allows for simpler, more manufacturable circuit designs compared to a single complex automatic gain control system, while maintaining stability across different distances.
Solution Approach 2:
The patent uses multiple copies of correlation masks stored in memory, each corresponding to a specific distance interval. Instead of using complex dynamic gain control circuitry, the system copies appropriate pre-defined masks for different distance ranges, simplifying manufacturing while maintaining processing stability.
3Measurement precision
If distance detection is performed to select appropriate correlation signals, then processing accuracy is improved, but processing time increases
Solution Approach 1:
The patent performs preliminary action by pre-defining multiple correlation masks for different distance intervals before signal processing. The distance detection quickly identifies which interval the signal falls into, and the corresponding pre-prepared mask is immediately applied, eliminating the need for time-consuming real-time mask generation or selection algorithms.
Solution Approach 2:
The system dynamically selects from pre-defined masks based on distance detection, but the masks themselves are prepared in advance. This dynamic selection from static pre-computed options balances accuracy with speed, avoiding the time penalty of real-time mask generation while maintaining processing precision.
4Productivity
If high-frequency analog-digital converters are used for UWB signal processing, then signal processing capability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent segments the signal processing into multiple parallel correlation channels that operate at lower frequencies. Instead of using a single high-frequency converter, the system divides the processing workload across multiple channels, each handling specific distance intervals, thereby reducing the frequency requirements for individual converters while maintaining overall processing capability.
Solution Approach 2:
The patent replaces the need for high-frequency analog-digital conversion with digital signal processing techniques. By using correlation masks and digital correlation processing, the system achieves UWB signal processing capability without requiring complex high-frequency hardware converters, simplifying the overall device architecture.
Data Source
AI summary
The waveform of the signal varies according to the distance at which the signal was emitted, and several correlation signals are defined and correspond respectively to at least part of several sampled waveforms of the signal respectively emitted at several distances of different values so that the sum of the maxima of intercorrelations performed respectively between the various correlation signals and the various sampled waveforms is substantially constant over an interval including all the values of the distances. The correlation processing includes several elementary correlation processings respectively performed with the correlation signals and each delivering initial correlation values, as well as a summation of the homologous initial correlation values respectively delivered by the elementary correlation processings so as to obtain the correlation values.