Satellite Signal Demodulation for Overlapping Bandwidth
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Solution Overview
Problem
In satellite communications, separating signals in frequency or physical distance to minimize interference can decrease data transmission rates and efficiency, especially when interfering signals from unknown or hostile sources are involved, limiting the reuse of bandwidth and increasing interference among overlapping transmitted signals.
Innovation Solution
A demodulation apparatus and method that processes composite signals by exponentiating them to extract continuous waves corresponding to individual signals, deriving symbol rates, and resampling to determine modulation types and offset information, allowing for the regeneration and separation of overlapping signals, thereby increasing data throughput and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If signals are separated in frequency or physical distance to minimize interference, then interference is reduced, but data transmission rates and efficiency decrease
Solution Approach 1:
The patent applies envelope feedback interference reduction to convert the harmful effect of overlapping signals into beneficial information. By detecting the envelope of the composite signal and using it to estimate and cancel interfering components, the system recovers the original signal while maintaining frequency overlap, thus preserving bandwidth efficiency while reducing interference
Solution Approach 2:
The patent implements a feedback mechanism where the received composite signal is processed to extract envelope information, which then feeds back into the system to generate cancellation signals. This feedback loop enables continuous interference mitigation, allowing the system to maintain high data transmission rates even with overlapping frequencies by dynamically adjusting cancellation based on actual received signal characteristics
2Productivity
If bandwidth is reused to increase data transmission capacity, then throughput increases, but interference among transmissions increases
Solution Approach 1:
The system converts the harmful interference caused by bandwidth reuse into useful envelope information. By treating the composite signal's envelope as a source of cancellation data rather than mere noise, the patent enables multiple transmissions to share the same bandwidth efficiently, increasing throughput while maintaining signal integrity through intelligent interference exploitation
Solution Approach 2:
The patent changes the approach to handling interfering signals by shifting from frequency separation to envelope-based cancellation. This parameter change allows the system to maintain frequency overlap (high throughput) while dynamically adjusting the cancellation process based on envelope characteristics, effectively managing interference without sacrificing bandwidth reuse benefits
Data Source
AI summary
A device and method for demodulation of multiple received signals is provided. The device can have a receiver configured to receive a composite signal having two or more constituent signals overlapped in frequency. The device can have one or more processors configured to determine a at least one modulation type and at least one symbol rate corresponding to the two or more constituent signals. The one or more processors can further resample the composite signal at a sampling rate that is a multiple of the at least one symbol rate to determine the characteristics of the two or more constituent signals. The one or more processors can separate and output the two or more constituent signals using the determined characteristics.