UWB Timing Recovery Using CIR Correlation and Matched Filtering
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Solution Overview
Problem
Ultra-wideband (UWB) communication systems face challenges in accurately determining the angle of incidence of RF signals due to channel-induced noise and power consumption issues in existing receiver implementations, particularly in multi-path spread-spectrum systems, where known techniques for carrier recovery and timing recovery are less than optimal and consume excessive power.
Innovation Solution
A method for a UWB communication system that involves developing complex estimates of the impulse response to perform carrier and timing recovery, using a carrier acquisition mode and data recovery mode, which includes correlating and accumulating complex estimates to determine carrier error angles and timing phase errors, thereby improving signal processing efficiency and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If known techniques for carrier recovery and timing recovery are used in multi-path spread-spectrum systems, then signal processing can be performed, but power consumption is excessive
Solution Approach 1:
The patent extracts and eliminates redundant processing steps from traditional carrier and timing recovery algorithms. By identifying and removing unnecessary computational operations that do not contribute to actual signal recovery, the system achieves significant power reduction while maintaining processing reliability.
Solution Approach 2:
The patent applies partial action by performing only the essential correlation and accumulation operations needed for recovery, rather than executing complete traditional algorithms. The system performs correlation of complex estimates with impulse response and accumulates results only when necessary, avoiding excessive computation and reducing power consumption.
2Measurement precision
If traditional carrier and timing recovery methods are implemented, then signal processing is possible, but accuracy of angle of incidence determination is reduced due to channel-induced noise
Solution Approach 1:
The patent converts the harmful effect of channel-induced noise into a beneficial process by using correlation with the known impulse response. The correlation operation inherently filters out uncorrelated noise components while reinforcing the signal, transforming noise contamination into an opportunity for selective signal enhancement and accurate angle determination.
Solution Approach 2:
The patent implements feedback through iterative correlation and accumulation processes. By continuously correlating received signals with estimated impulse responses and using the accumulated results to refine angle of incidence calculations, the system progressively improves measurement accuracy despite the presence of channel-induced noise.
Data Source
AI summary
In an ultra-wideband (“UWB”) receiver, a received UWB signal is periodically digitized as a series of ternary samples. During a carrier acquisition mode, the samples are continuously correlated with a predetermined preamble sequence to develop a correlation value. When the value exceeds a predetermined threshold, indicating that the preamble sequence is being received, estimates of the channel impulse response (“CIR”) are developed. When a start-of-frame delimiter (“SFD”) is detected, the best CIR estimate is provided to a channel matched filter (“CMF”). During a data recovery mode, the CMF filters channel-injected noise from the sample stream. Both carrier phase errors and data timing errors are continuously detected and corrected during both the carrier acquisition and data recovery modes of operation.