Multipath Signal Processor for UWB Interference Mitigation
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Solution Overview
Problem
Real-time location systems (RTLS) face interference from mobile devices operating in the same frequency band as RFID tags, leading to reduced detection accuracy and coverage, especially in environments like football stadiums where multiple interfering systems are present.
Innovation Solution
The implementation of a multipath signal processor (MSP) with parallel RF signal processing paths using bandpass filters of varying bandwidths to differentiate and filter out interfering signals, allowing for improved detection of ultra-wideband (UWB) transmissions by attenuating signal energy in specific frequency bands associated with interfering systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bandpass filters of varying bandwidths are used to filter out interfering signals, then detection accuracy in the presence of interference is improved, but device complexity increases
Solution Approach 1:
The system divides the frequency spectrum into multiple bands using parallel bandpass filters with different bandwidths (e.g., wideband filter covering 6.35-6.75 GHz, narrowband filters covering specific sub-bands). Each filter processes a segmented portion of the signal, allowing selective attenuation of interfering frequency bands while preserving UWB transmission detection capability across the entire spectrum.
Solution Approach 2:
The system transitions from single-dimension signal processing to multi-dimensional processing by implementing parallel signal paths with different filter characteristics. This adds the dimension of frequency selectivity at multiple levels, enabling the system to detect UWB transmissions while simultaneously filtering out narrowband interferers through the combined output of multiple filtered paths.
2Object-affected harmful factors
If parallel RF signal processing paths with bandpass filters are implemented, then interference mitigation is improved, but the system requires more signal processing paths increasing complexity
Solution Approach 1:
The system segments the signal processing function into multiple parallel paths, each containing a bandpass filter with specific bandwidth characteristics. This segmentation allows each path to independently process signals with different frequency selectivity, collectively providing comprehensive interference mitigation across the entire UWB spectrum through their combined output.
Solution Approach 2:
Each parallel signal processing path serves multiple functions: it detects UWB transmissions within its passband, filters out narrowband interferers outside its passband, and contributes to overall detection accuracy. The combined system universally handles both detection and interference rejection across the entire frequency range through the collaborative operation of all paths.
3Measurement precision
If bandpass filters attenuate signal energy in specific frequency bands, then detection sensitivity to UWB transmissions is improved, but signal energy loss increases
Solution Approach 1:
The system segments the frequency spectrum into multiple bands and processes each segment independently through dedicated bandpass filters. By combining the outputs of these segmented paths, the system achieves selective attenuation of only the interfering frequency bands while preserving signal energy across the entire UWB transmission spectrum, minimizing overall energy loss.
Solution Approach 2:
The system merges the outputs of multiple parallel filtered signal paths to reconstruct the complete UWB signal spectrum. This combining process integrates the attenuated interferer components from each path while preserving the desired UWB transmission energy, achieving interference mitigation without proportional signal energy loss through constructive combination of filtered paths.
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
This approach enhances the detection of UWB transmissions by minimizing interference, providing broader coverage and higher sensitivity in the absence of interference, while maintaining accuracy in the presence of interference, thus improving the overall precision of location tracking in RTLS.
Implementation Method 1
a first filter (205a) is configured to pass first signal energy in a first radio frequency (RF) spectral band associated with a signaling bandwidth of an ultra-wideband (UWB) RF signaling system, and to output a first filtered signal. A second filter (205b) is configured to pass second signal energy in a second RF spectral band associated with the signaling bandwidth of the UWB RF signaling system, and to output a second filtered signal
Data Source
AI summary
An example apparatus includes a first detector configured to generate a first digitized stream of pulses and a second detector configured to generate a second digitized stream of pulses; a first packet decoder configured to decode a first valid over-the-air packet from the first digitized stream of pulses and generate a first time-stamped tag data packet; a second packet decoder configured to decode a second valid over-the-air packet from the second digitized stream of pulses; an arbiter configured to receive at least one of first and second time-stamped tag data packets and to select a time-stamped tag data packet from the at least one of the first and second time-stamped tag data packets; and a packet formatter to formulate a network data packet based on the selected time-stamped tag data packet.