Adaptive Receiver Filter Paths for In-Band WLAN Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional WLAN devices suffer from reduced sensitivity and performance due to inadequate suppression of in-band interference, especially in high deployment scenarios, leading to degraded signal-to-noise ratio and increased power consumption.
Innovation Solution
A receiver unit with an adaptable filter unit comprising multiple filters, controlled by a monitoring and control unit, selectively attenuates undesired frequency ranges while allowing desired signals to pass through, enhancing sensitivity and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the front end power amplifier is attenuated to protect from signal degradation caused by high in-band input power, then signal degradation is reduced, but thermal noise performance and receiver sensitivity are significantly deteriorated
Solution Approach 1:
The receiver is divided into two parallel paths: a conventional path and a bypass path. The bypass path includes a bypass amplifier that operates independently to handle high-power interferers, while the conventional path processes desired signals. This segmentation allows the system to protect against signal degradation without attenuating the entire signal chain, thereby maintaining receiver sensitivity.
Solution Approach 2:
A bypass amplifier is introduced as an intermediary component between the antenna and the conventional amplifier. This bypass amplifier specifically handles high-power interferers and cellular signals, preventing them from degrading the conventional amplifier's performance. The intermediary bypass path allows the main conventional path to operate at optimal sensitivity without being compromised by high-power inputs.
2Reliability
If additional stages are added to the receiver to mitigate interference (e.g., IASO technique), then interference suppression is improved, but device complexity and power consumption increase
Solution Approach 1:
The receiver is divided into two parallel paths: a conventional path and a bypass path. The bypass path includes a bypass amplifier that operates independently to handle high-power interferers, while the conventional path processes desired signals. This segmentation allows the system to protect against signal degradation without attenuating the entire signal chain, thereby maintaining receiver sensitivity.
Solution Approach 2:
The bypass amplifier extracts and handles only the high-power interferer signals separately from the conventional signal path. By taking out the interferer processing function into a dedicated bypass path, the system avoids the complexity of integrating interference suppression into the main receiver chain, thus reducing overall device complexity while maintaining suppression capability.
3Object-affected harmful factors
If a bypass stage is activated at high power-input levels to bypass the input LNA, then high-power interferer handling is improved, but noise figure and receiver sensitivity are degraded
Solution Approach 1:
The receiver is divided into two parallel paths: a conventional path and a bypass path. The bypass path includes a bypass amplifier that operates independently to handle high-power interferers, while the conventional path processes desired signals. This segmentation allows the system to protect against signal degradation without attenuating the entire signal chain, thereby maintaining receiver sensitivity.
Solution Approach 2:
The bypass amplifier is positioned to specifically handle high-power interferers and cellular signals, while the conventional amplifier continues to process desired signals at optimal sensitivity. This local quality differentiation ensures that high-power interferers are managed without compromising the sensitivity performance for weak desired signals, as each path is optimized for its specific function.
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
The solution effectively suppresses in-band interference, improving receiver performance and throughput in dense wireless networks by dynamically filtering out interfering signals, thus maintaining signal integrity and reducing power consumption.
Implementation Method 1
an adaptable filter unit comprising a plurality of filters of different types arranged to selectively attenuate the at least second frequency range, while letting the first frequency range through to the front-end module
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
A receiver unit for use in a wireless network, includes a front-end module arranged to receive an incoming signal from an antenna. The incoming signal comprises a first frequency range corresponding to a desired channel and at least a second frequency range comprising an undesired signal. The receiver unit further comprises an adaptable filter unit arranged between the antenna and the front-end module, and includes at least one filter arranged to selectively attenuate the at least second frequency range, while letting the first frequency range through to the front-end module. The receiver unit further comprises a control unit arranged to control the adaptable filter unit to control the frequencies included in the first and/or the second frequency range.