Duplexer Routing Logic for Multi-Module Wireless Interference
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Solution Overview
Problem
In wireless communication systems with multiple modules, interference between transmitter and receiver modules can occur, leading to signal saturation and degradation of the signal-to-noise ratio, particularly when signals from one module overlap with the frequency band of another module, causing 'desense' and reducing the ability to accurately receive information.
Innovation Solution
A transceiver system using a duplexer with a transmit band pass filter and control logic to selectively route data through or bypass the duplexer based on the active state of the second wireless module, attenuating frequencies within the receiver's band to mitigate interference and reduce transmission loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transmitter and receiver operate simultaneously in the same wireless device at different frequency bands, then the device provides versatile communication functionality, but the transmitter signal can saturate and jam the receiver, preventing accurate information reception
Solution Approach 1:
The patent divides the frequency spectrum into distinct bands with a guard band separating the transmitter frequency band from the receiver frequency band. This segmentation prevents the transmitter signal from overlapping with and saturating the receiver, allowing both functions to operate simultaneously without interference while maintaining signal reception accuracy.
Solution Approach 2:
The patent introduces a guard band as an intermediary frequency range between the transmitter and receiver bands. This guard band acts as a buffer that absorbs and attenuates transmitter signals before they can reach the receiver, preventing saturation and jamming while enabling versatile communication functionality.
2Power
If a transmitter operates at a frequency that produces noise outside the intended transmission band, then the transmitter provides robust signal transmission, but the noise can reach and desense simultaneously operating receivers, decreasing their ability to accurately receive information
Solution Approach 1:
The patent applies different frequency allocation strategies to different parts of the spectrum. The guard band is specifically designed with local quality characteristics to absorb and attenuate out-of-band noise from the transmitter. This localized frequency management reduces noise interference reaching receivers while maintaining robust transmission signal strength in the intended band.
3Adaptability or versatility
If multiple wireless modules operate in the same device with overlapping frequency bands, then the device achieves multi-band and multi-mode capability, but inter-module interference occurs causing signal saturation and desense
Solution Approach 1:
The patent segments the frequency spectrum into distinct allocated bands for different wireless modules, separated by guard bands. This segmentation allows multiple modules to operate simultaneously with multi-band and multi-mode capability while preventing inter-module interference through the protective guard band barriers.
Solution Approach 2:
The guard band serves as an intermediary frequency region between different wireless modules' operating bands. It acts as a buffer that attenuates signals and noise from one module before they can interfere with another module's receiver, enabling versatile multi-module operation without harmful inter-module interference.
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
Effectively reduces inter-module interference, allowing for improved signal reception and power savings by dynamically managing the duplexer's usage based on the active state of the second module, thereby enhancing the overall performance of wireless devices with multiple bands and modes.
Implementation Method 1
A duplexer is provided that includes a transmit band pass filter with a rejection band near the receive band
Implementation Method 2
A switch is provided that connects the transmitter to the duplexer when the second module is active and that connects the transmitter to the antenna while bypassing the duplexer when the second module is inactive
Data Source
AI summary
Wireless communications devices, methods and systems are implemented in various fashions. According to one such implementation, a method is used in a device using time-division-multiple access and multiple-mode wireless modules. Logic generates a signal indicative (304) of a first (e.g., TV) wireless module (150) being active. In a first state where the first wireless module (150) is active, a switch connects a transmitter of a second (e.g., cellular) wireless module (100) to a duplexer (202). In a second state where the first wireless module is not active, logic connects the transmitter of the second wireless module (100) to an antenna (102) while bypassing the duplexer (202). Logic connects, in the first state, the duplexer (202) to the antenna (102) and connects, in the second state, the transmitter to the antenna while bypassing the duplexer (202). The duplexer (202) connects a receiver of the second wireless module (100) to the antenna (202) and includes a transmit band pass filter designed with a rejection band near an operating band of the first wireless module (150).