Anti-Jam Low Noise Amplifier Self-Interference Rejection
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Solution Overview
Problem
Radio frequency communication systems face a reduction in signal to noise ratio due to self-interference leakage and the use of transmit rejection filters, which cause signal power attenuation.
Innovation Solution
The implementation of an anti-jam low noise amplifier provides resistance to transmitter self-jamming, reducing or eliminating the need for transmit rejection filters and associated losses, thereby improving signal to noise ratio performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmit rejection filters, limiters, or blanking switches are implemented to reject self interference, then self interference rejection is improved, but signal power is attenuated causing signal to noise ratio degradation
Solution Approach 1:
The patent removes the transmit rejection filter from the receive signal path, extracting the harmful filtering element that caused signal attenuation. The system achieves self-interference rejection through alternative means (receiver design and signal processing) rather than through filtering, thereby eliminating the associated signal power loss while maintaining interference rejection capability.
Solution Approach 2:
The patent replaces the mechanical/electrical filtering approach (transmit rejection filter, limiters, blanking switches) with a signal processing approach. The receiver uses digital signal processing techniques to reject self-interference, substituting the physical filtering mechanism with an algorithmic solution that does not attenuate the desired signal.
2Object-affected harmful factors
If transmit rejection filters are used to limit self interference leakage, then interference rejection is improved, but device complexity increases due to additional components
Solution Approach 1:
The patent extracts and removes the transmit rejection filter from the system architecture, simplifying the device by eliminating this complex filtering component. The functionality is transferred to the receiver's signal processing capabilities, reducing the overall number of passive components and simplifying the system design.
Solution Approach 2:
The receiver is designed to perform multiple functions: it both receives the desired signal and rejects self-interference through integrated signal processing. This multi-functionality eliminates the need for separate transmit rejection filtering components, reducing device complexity while maintaining interference rejection performance.
Data Source
AI summary
The signal to noise ratio performance of a RF communication system can be improved by providing resistance to transmitter self-jamming and eliminating or reducing the need for a transmit rejection filter or other measures such as limiters or blanking switches. An anti-jam low noise amplifier provides enough rejection and jamming immunity to reduce or eliminate the need for the transmit reject filter. Thus, the system noise performance is improved by eliminating the filter and the associated losses which cause signal to noise ratio performance degradation.