Transceiver Attenuator Triple Transit Noise Reduction
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Solution Overview
Problem
Microwave radio systems face performance degradation due to the triple transit effect, where data signals bounce back and cause self-interference, requiring complex filters and tunable components to separate frequencies and reduce noise, but these solutions are costly and time-consuming to implement.
Innovation Solution
The system employs attenuators and gain modules in transceiver units to attenuate and adjust signals, using sensors and controllers to manage attenuation and gain based on signal thresholds, reducing the triple transit effect by attenuating reflected signals multiple times while maintaining desired signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex filters and tunable components are used to separate frequencies and reduce noise, then signal quality is improved, but device complexity and implementation cost increase
Solution Approach 1:
The patent extracts and removes the reflected signal component from the transmission path using a directional coupler, separating the harmful reflected energy from the forward traveling signal. This extraction approach eliminates the need for complex filtering while maintaining signal quality.
Solution Approach 2:
The patent converts the harmful reflected signal into a beneficial measurement tool by using it to control the attenuator. The reflected signal that would normally cause interference is instead used as feedback to dynamically adjust attenuation, reducing the triple transit effect and improving signal integrity.
2Reliability
If complex filters and tunable components are used to separate frequencies, then noise reduction is improved, but ease of manufacture deteriorates
Solution Approach 1:
The harmful reflected signal is extracted from the main transmission path using a directional coupler, allowing simple attenuation of the reflected component without requiring complex frequency-selective filters. This simplifies manufacturing while maintaining noise reduction performance.
Solution Approach 2:
The system uses the reflected signal itself to control the attenuator through feedback, making the noise reduction adaptive and self-regulating. This eliminates the need for manual tuning or complex programmable filters, greatly simplifying manufacturing and deployment.
3Reliability
If multiple attenuations of reflected signals are applied, then triple transit effect is reduced, but signal loss increases
Solution Approach 1:
The patent segments the signal path into forward-traveling and reflected components using a directional coupler. By treating these segments separately, the system can apply attenuation only to the reflected signal segment while leaving the forward signal unaffected, thus reducing triple transit without significant signal loss.
Solution Approach 2:
The directional coupler acts as an intermediary device that selectively couples only the reflected signal to the attenuator while allowing the forward signal to pass through unaffected. This mediator approach enables targeted attenuation of harmful reflections without energy loss in the main transmission path.
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 significantly reduces noise caused by the triple transit effect without the need for expensive or sophisticated tuning, improving signal quality and reducing the complexity of component management in microwave radio systems.
Implementation Method 1
The first attenuator may be configured to attenuate a transmission signal from a second transceiver module over a coaxial cable. The first attenuator may further be configured to attenuate and provide a reflection signal over the coaxial cable to the second transceiver module.
Implementation Method 2
The sensor may be configured to provide a sensor signal based on the transmission signal.
Implementation Method 3
The controller may be configured to compare the sensor signal to an attenuation threshold, to generate an attenuator control signal based on the comparison, and to control the first attenuator with the attenuator control signal.
Implementation Method 4
The gain module may be configured to increase the gain of the transmission signal from the filter.
Data Source
AI summary
Systems and methods for transceiver communication are discussed herein. A filter module may be configured to filter each carrier signal of a multicarrier transmit signal with a different bandpass filter, each bandpass filter configured to filter a different frequency band. A carrier control module may be configured to control the plurality of bandpass filters of the filter module using a carrier selection signal to enable or disable each bandpass filter, thereby coupling carrier signals of the multicarrier transmit signal to a first set of bandpass filters and decoupling a second set of bandpass filters. Filtering the carrier signals of the multicarrier transmit signal is performed by the first set of bandpass filters while the decoupling of the second set of bandpass filters limits energy in the respective frequency band. An antenna may be configured to transmit the filtered multicarrier transmit signal.