Mobile Relay Signal-Path Switching for Weak-Signal Interference
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Solution Overview
Problem
Radio signals with undesired frequency bands interfere with weak radio signals in desired frequency bands, leading to deterioration in reception sensitivity in wireless communication systems, particularly in scenarios involving IoT terminals and low earth orbiting satellites.
Innovation Solution
A wireless communication system with a mobile relay device that includes an antenna, measurement unit, and switching control unit to dynamically switch the signal processing system based on interference levels, using band-pass filters and amplifiers to isolate and amplify desired frequency bands, thereby inhibiting interference from undesired signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a low noise amplifier is provided immediately after the reception antenna to inhibit noise figure increase, then reception sensitivity of weak radio signals is improved, but unnecessary waves at high signal levels interfere with desired weak radio signals causing deterioration in reception sensitivity
Solution Approach 1:
The signal processing path is segmented into two separate processing chains: one for handling weak desired signals (with LNA first) and another for handling strong unnecessary waves (with band-pass filter first). The switching unit selects the appropriate chain based on signal strength, allowing each chain to be optimized for its specific purpose without compromise
Solution Approach 2:
The system dynamically switches between two different signal processing configurations based on the strength of received signals. When unnecessary waves are strong, the system switches to the band-pass filter first configuration; when desired weak signals are strong, it switches to the LNA first configuration. This dynamic adaptation resolves the contradiction by selecting the optimal configuration for current conditions
2Object-affected harmful factors
If band-pass filters are placed before amplifiers to remove unnecessary waves, then interference from undesired frequency bands is reduced, but weak desired radio signals may be lost or attenuated before amplification
Solution Approach 1:
The system creates separate processing chains with different component orderings. One chain has the band-pass filter before the amplifier (for handling strong interference), while the other has the amplifier before the filter (for handling weak signals). This segmentation allows each chain to be optimized for its specific operating condition without compromising the other
Solution Approach 2:
The switching unit dynamically selects between the two processing chain configurations based on signal characteristics. When interference is detected, the system switches to the filter-first configuration; when only weak desired signals are present, it switches to the amplifier-first configuration, thereby adapting to conditions and resolving the contradiction
3Device complexity
If a single fixed signal processing system is used, then device complexity is reduced, but the system cannot adapt to varying interference conditions and signal strengths
Solution Approach 1:
The system achieves multi-functionality by incorporating two complete signal processing chains with different component orderings, along with a switching unit that selects between them. This universal design allows the single device to handle both weak desired signals and strong interference conditions effectively, adapting to varying operational requirements
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 effectively inhibits deterioration in reception sensitivity by isolating and amplifying desired frequency bands, improving communication quality and link budget in wireless communication systems.
Implementation Method 1
extract the analog signal with the desired frequency band from the analog signal
Implementation Method 2
amplify the amplitude of the input analog signal
Data Source
AI summary
A wireless communication system includes: a measurement unit that measures a signal level of an analog signal corresponding to a received radio signal; a first output unit that amplifies an amplitude of the analog signal and extracts an analog signal with a desired frequency band from the analog signal with the amplified amplitude; a second output unit that extracts an analog signal with a desired frequency band from the analog signal and amplifies an amplitude of the extracted analog signal; and a switching control unit that inputs the analog signal corresponding to the received radio signal to the first output unit when the signal level of the analog signal other than the desired frequency band is less than a threshold, and inputs the analog signal corresponding to the received radio signal to the second output unit when the signal level of the analog signal other than the desired frequency band is equal to or greater than the threshold.