Adaptive Receiver Transimpedance Control for RF Signal Recovery
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Solution Overview
Problem
The conversion of data between radio frequency and optical signals creates temporal bottlenecks, and radio frequency transmissions face challenges in cluttered environments, such as urban areas, making it difficult to establish line of sight communications.
Innovation Solution
An adaptive receiver system that includes a current buffer, inverter-based transimpedance circuit, average current control loop, variable gain circuit, and automatic gain control loop to recover radio frequency signals from modulated coherent optical signals, and an optical test system to simulate and adjust for variations in signal propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data is converted between radio frequency and optical signals, then data can be transmitted between space and ground platforms, but temporal bottlenecks are created at conversion locations
Solution Approach 1:
The patent extracts the RF signal directly from the optical signal at the photodetector output without converting to baseband data first. The RF transimpedance amplifier and subsequent RF processing circuits recover the RF signal in its original form, eliminating the intermediate data conversion step that creates temporal bottlenecks.
Solution Approach 2:
The patent introduces an RF transimpedance amplifier as an intermediary component that directly converts the optical signal to RF signal form. This intermediary circuit preserves the RF signal characteristics while enabling direct transmission, avoiding the need for full data conversion and re-encoding.
2Reliability
If radio frequency signals are used for data transmission, then communication can be established, but line of sight communication is difficult in physically cluttered environments
Solution Approach 1:
The patent replaces traditional RF transmission with optical signal transmission carrying RF information. Optical signals have smaller wavelengths that can better penetrate or diffract around obstacles in cluttered environments, while the RF signal structure is preserved for compatibility with existing RF systems.
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
Enhances data transfer efficiency and bandwidth by directly encoding RF signals onto optical carriers, reducing bottlenecks and improving signal recovery in challenging environments.
Implementation Method 1
The inverter based transimpedance circuit receives a buffered current from the current buffer and converts the buffered current to a variable gain voltage
Implementation Method 2
The automatic gain control loop feeds back from the differential voltage amplifier to the inverter based transimpedance circuit and variable gain circuit, wherein the automatic gain control loop adaptively controls a peak to peak voltage output by the differential voltage amplifier based on a desired peak-to-peak level for the output of the differential voltage amplifier
Data Source
AI summary
An adaptive receiver comprising a current buffer, an inverter that receives input from the current buffer, an average current control loop that feeds back from the inverter to the current buffer, a variable gain circuit that receives input from the inverter, a differential voltage amplifier that receives input from the variable gain circuit, an automatic gain control loop that feeds back from the differential voltage amplifier to the inverter and variable gain circuit, and a differential buffer that receives input from the differential amplifier.