Variable UWB Bandpass Filter for Non-UWB Interference Rejection
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Solution Overview
Problem
UWB radios face interference from non-UWB signals due to fixed passband filters, leading to performance degradation and uncorrectable errors, and adding notch filters increases cost and complexity.
Innovation Solution
Implementing a variable bandpass filter with tunable cutoff frequencies controlled by a control circuit to filter out non-UWB signals, adjusting the passband to avoid interference without increasing cost or complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed passband filter is used in UWB radio, then the filter structure is simple and cost is low, but non-UWB signals interfere with UWB signals causing performance degradation and uncorrectable errors
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a fixed passband filter to a variable bandpass filter with tunable cutoff frequencies. The control circuit dynamically adjusts the filter's passband to adapt to different signal conditions, enabling the system to maintain optimal filtering performance across varying operational environments without requiring multiple fixed filter configurations.
Solution Approach 2:
The patent implements parameter changes by modifying the cutoff frequencies of the bandpass filter based on detected signal characteristics. The control circuit changes the filter parameters (lower and upper cutoff frequencies) in response to detected non-UWB signals, allowing the filter to adapt its transmission characteristics to eliminate interference while maintaining UWB signal integrity.
2Object-affected harmful factors
If notch filters are added to filter non-UWB signals, then interference is reduced, but cost and device complexity increase
Solution Approach 1:
The patent applies universality by designing a single variable bandpass filter that performs multiple functions: it filters UWB signals during normal operation and simultaneously suppresses non-UWB interference when detected. This multi-functional approach eliminates the need for separate notch filters, achieving interference rejection without adding additional filter components or increasing overall system complexity.
Solution Approach 2:
The patent merges the functions of UWB signal filtering and non-UWB interference suppression into a single variable bandpass filter. By combining these functions in one filter component rather than using separate filters, the system achieves interference rejection while maintaining a simple, cost-effective structure without the complexity of multiple specialized filters.
Data Source
AI summary
An ultra-wideband (UWB) radio includes a first bandpass filter, a first analog-to-digital converter (ADC), a baseband processor, and a first control circuit. The first bandpass filter is configured to filter a radio frequency (RF) signal according a first lower cutoff frequency and a first upper cutoff frequency, thereby forming a first filtered signal. The first ADC is configured to convert the first filtered signal to a first digital signal. The baseband processor is configured to process the first digital signal. The first control circuit is configured to control the first lower cutoff frequency and the first upper cutoff frequency.