Wideband RF Receiver Bypass Path for Critical Condition Adaptation
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Solution Overview
Problem
Conventional wideband RF receivers face challenges due to the negative influence of signal content outside the desired frequency band on the demodulation stage, leading to difficult reception conditions and high costs associated with analog filter circuitry.
Innovation Solution
An RF receiver design that includes an analog-to-digital converter, cascaded decimation units, and a signal processing unit with a bypass path, allowing for detection and adaptation to critical reception conditions by analyzing a bypass signal, thereby reducing the need for expensive analog filter circuitry and enabling robust reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wideband analog-to-digital conversion is used to omit analog filter circuitry, then cost is reduced and integration is improved, but signal content outside the desired frequency band negatively influences demodulation performance
Solution Approach 1:
The patent applies preliminary action by performing spectral analysis and detecting critical reception conditions before the final demodulation stage. The signal processing unit analyzes the bypass signal to identify interfering signals and adjusts processing parameters in advance, preventing degradation of demodulation performance before it occurs.
Solution Approach 2:
The patent implements feedback by using the bypass signal path to continuously monitor the wideband digital signal for critical reception conditions. The signal processing unit uses this feedback information to adaptively adjust the processing of the decimated signal, maintaining demodulation performance despite the wide passband.
2Reliability
If analog filter circuitry is used to select the wanted intermediate frequency band, then demodulation performance is maintained, but cost increases and integration with digital circuitry becomes difficult
Solution Approach 1:
The patent extracts the filtering function from the analog domain and moves it to the digital domain. Instead of using analog filter circuitry to select the wanted frequency band, the system uses digital signal processing techniques including decimation units and adaptive processing to achieve frequency selection, enabling full integration with digital circuitry.
Solution Approach 2:
The patent replaces the mechanical analog filter circuitry with a digital signal processing system. The analog filtering mechanism is substituted with digital decimation units, bypass signal analysis, and software-based signal processing, achieving both integration and performance.
3Adaptability or versatility
If wideband reception is implemented to enable simultaneous reception of multiple signals, then functionality is improved, but signal interference from out-of-band content increases
Solution Approach 1:
The patent applies dynamics by making the signal processing adaptive rather than static. The signal processing unit dynamically adjusts processing parameters based on real-time analysis of the bypass signal, allowing the system to optimize performance for different reception conditions while maintaining wideband capability.
Solution Approach 2:
The patent implements local quality by applying different processing strategies to different frequency components. The system identifies specific interfering signals in the bypass signal and applies targeted processing adjustments to affected frequency bands while maintaining optimal processing for other bands, enabling simultaneous reception of multiple signals with reduced interference.
Data Source
AI summary
An RF receiver is disclosed. The RF receiver includes an analog-to-digital converter for converting an analog intermediate frequency band signal to a digital intermediate frequency band signal. A plurality of decimation units coupled in cascade for generating a decimated signal based on the digital intermediate frequency band signal are also included. The RF receiver further includes a signal processing unit for processing the decimated signal and a bypass path for feeding a bypass signal to the signal processing unit. The bypass signal is either the digital intermediate frequency band signal or an output signal from one of the decimation units which is not the last one of the cascade coupled decimation units. The signal processing unit is adapted to detect critical reception conditions based on the bypass signal and to adapt the processing of the decimated signal in accordance with detected critical reception conditions.