UWB Receiver Ternary ADC First Path Detection
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Solution Overview
Problem
Existing ultra-wideband (UWB) communication systems face challenges in determining the first path of a received signal due to noise, multipath components, and interference, which affects accurate ranging estimates and consumes excessive power in known implementations.
Innovation Solution
A UWB receiver using a ternary analog-to-digital converter (ADC) with positive and negative magnitude thresholds, correlator, and accumulator to determine the first path with reduced circuitry and power consumption, employing triangular interpolation to find the peak of the slope of the impulse response for improved signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional implementations are used to determine the first path in UWB systems, then measurement precision can be achieved, but power consumption increases excessively
Solution Approach 1:
The patent changes the fundamental parameter of signal representation from binary to ternary (three-valued: positive, zero, negative). This parameter change enables the ADC to process signals with three distinct magnitude levels, reducing the need for complex subsequent processing while maintaining first path detection accuracy, thereby lowering overall power consumption.
Solution Approach 2:
The patent applies different processing approaches to different signal components. By using triangular interpolation specifically for identifying the peak of the slope of the impulse response, the system achieves precise first path determination only where needed, rather than applying complex processing uniformly across all signal aspects.
2Measurement precision
If conventional implementations are used to determine the first path in UWB systems, then measurement precision can be achieved, but device complexity increases
Solution Approach 1:
The ternary ADC output format simplifies the data structure that needs to be processed downstream. By encoding signal magnitudes as positive, zero, or negative values rather than full binary representations, the patent reduces the complexity of correlators and accumulators while maintaining the ability to accurately determine the first path.
Solution Approach 2:
The patent extracts only the essential information needed for first path determination from the received signal. By focusing on detecting positive, zero, and negative magnitude crossings rather than processing the complete signal waveform, the system reduces computational complexity while preserving measurement precision.
3Reliability
If noise and multipath components are present in the received signal, then signal recovery becomes difficult, but increasing processing complexity to overcome this worsens power consumption
Solution Approach 1:
The patent performs preliminary signal conditioning by using the ternary ADC to immediately classify incoming signal samples as positive, zero, or negative. This preliminary classification occurs at the earliest possible stage, creating a simplified representation that is inherently more robust to noise and multipath effects before further processing occurs.
Solution Approach 2:
The patent converts the presence of noise and multipath components into a benefit by using triangular interpolation on the ternary signal. The interpolation method naturally smooths out noise variations while preserving the essential first path information, effectively using the signal's structure to overcome the harmful effects of interference.
Data Source
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Figure 4a
AI summary
In an ultra-wideband ("UWB") receiver, a received UWB signal is periodically digitized as a series of ternary samples. Statistics relating to coefficients of a CIR channel impulse response (CIR) as well as a noise region preceding a leading edge of the CIR are used to calculate a threshold. Interpolation is performed on a window of coefficients around the first path exceeding the threshold and the point of maximum rate of change of the leading edge of the impulse responseis taken as the first path.