Optical LNB with Digital Channelizer for Satellite Signal Conversion
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Solution Overview
Problem
Existing satellite signal conversion systems face inefficiencies in converting high-frequency satellite signals to intermediate frequencies for decoding, particularly due to signal loss in coaxial cables and limitations in selecting multiple content channels without additional cables.
Innovation Solution
The use of an optical Low Noise Block Converter (LNB) with a digital channelizer switch that downconverts satellite signals to intermediate frequencies, digitizes them, and uses digital channelizers to select content channels, reducing power consumption and component costs by replacing analog RF circuitry with high-speed analog-to-digital and digital-to-analog converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If high-frequency satellite signals are transmitted through coaxial cables, then signal transmission is achieved, but signal loss increases with frequency and cable length
Solution Approach 1:
The patent replaces the traditional coaxial cable transmission system with an optical fiber transmission system. The LNB converts received satellite signals to optical signals that can be transmitted over fiber optic cables to the receiver, eliminating the signal loss problems associated with high-frequency coaxial cable transmission while maintaining signal integrity over long distances
Solution Approach 2:
The patent changes the transmission medium parameter from electrical coaxial cable to optical fiber, and changes the signal frequency parameter by converting RF signals to intermediate frequencies and then to optical signals. This parameter transformation allows signal transmission without the frequency-dependent losses characteristic of coaxial cables
2Use of energy by moving object
If traditional analog LNB systems are used, then signal conversion is achieved, but power consumption and component costs are high
Solution Approach 1:
The patent replaces analog RF circuitry with digital signal processing components. The LNB incorporates ADCs to convert analog intermediate frequency signals to digital signals, and uses digital channelizers and processors that consume less power and reduce the need for expensive analog components like high-frequency amplifiers and filters
Solution Approach 2:
The patent changes the signal processing domain from analog to digital. By converting signals to digital format early in the processing chain and maintaining them in digital form through channelization and selection, the system eliminates power-hungry analog components and reduces manufacturing costs through standardized digital electronics
3Speed
If analog circuitry is used for channel selection, then content channel selection is achieved, but switching speed is limited and scalability is restricted
Solution Approach 1:
The patent replaces analog switching circuitry with digital signal processing for channel selection. The system uses digital channelizers that can rapidly switch between channels in the digital domain, achieving instantaneous channel changes without the settling times and mechanical limitations of analog switches and filters
Solution Approach 2:
The patent segments the broadband signal into multiple narrowband channels using digital channelizers. Each channel can be independently processed and selected through digital switching, enabling fast channel changes and allowing the system to scale to support more channels by simply adding digital processing capacity rather than complex analog filtering networks
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 solution enables efficient conversion and selection of satellite signals, reducing power consumption and costs while allowing for instantaneous content channel switching and scalability to handle multiple channels, overcoming traditional analog circuitry limitations.
Implementation Method 1
a photo detector configured to generate a radio frequency (RF) signal from an input signal found on an optical cable
Implementation Method 2
a high speed analog to digital converter configured to digitize the radio frequency signal generated by the photodiode
Implementation Method 3
a high speed digital to analog converter configured to generate an analog output signal from the digitized radio frequency signal
Data Source
AI summary
Systems and methods in accordance with embodiments of the invention convert satellite signals to an intermediate frequency signal and selecting modulated digital data within the satellite signals for content decoding. One embodiment includes an optical low noise block converter (LNB) including a digital channelizer switch configured to select at least one content channel from an input signal including a plurality of content channels modulated onto a carrier and to output an optical signal including the selected at least one content channel.