Satellite Forward Channel Dummy Frame Header Reduction
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Solution Overview
Problem
Interference in satellite communications due to transmissions using the same frequencies degrades reception performance and limits channel throughput, with existing active cancellation methods being costly and imperfect, and current standards like DVB-S2 and DVB-S2X increasing satellite power consumption through continuous dummy frames.
Innovation Solution
Replacing full dummy frames with dummy frames' headers and inserting pilot sequences at gaps, transmitting these headers and pilot signals at reduced power, and optimizing their timing to minimize inter-beam interference, even when data is available for transmission, to reduce interference between satellite beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If full dummy frames are transmitted continuously to maintain TDM operation, then continuous transmission is achieved, but satellite power consumption increases
Solution Approach 1:
The patent extracts only the essential header portion of dummy frames and transmits it at reduced power, while omitting the full dummy frame payload. This extraction approach maintains the necessary synchronization and timing information while significantly reducing the energy consumption associated with transmitting complete dummy frames continuously.
Solution Approach 2:
Instead of continuous full dummy frame transmission, the patent implements periodic transmission of dummy frame headers at reduced power levels. This periodic action maintains the TDM operation rhythm and allows receiving satellites to synchronize properly while reducing overall power consumption compared to continuous full frame transmission.
2Productivity
If dummy frames are transmitted to compensate for peak to average information rate difference, then rate matching is achieved, but interference to adjacent beams increases
Solution Approach 1:
The patent applies local quality by transmitting dummy frame headers at reduced power levels specifically during time slots when data frames would cause interference to adjacent beams. This localized reduction in transmission power minimizes harmful interference to adjacent beams while maintaining the rate matching function through the presence of the header information.
3Object-affected harmful factors
If active interference cancellation means are used, then interference is reduced, but system cost and complexity increase
Solution Approach 1:
The patent implements preliminary action by having the transmitting satellite deliberately transmit dummy frame headers at reduced power before the harmful interference can affect adjacent beams. This advance preparation allows receiving satellites to properly synchronize and maintain their operations without requiring complex active interference cancellation systems.
Data Source
AI summary
The present invention provides a method for reducing interference to transmissions, occurring due to other transmissions sent from/to neighboring satellites using same frequencies and/or interference that occur due to other communications transmitted along different satellite's beams using the same frequencies, wherein the method comprises the step of replacing full dummy frames that should be transmitted in a TDM continuous satellite forward channel, by dummy frames' headers with or without a pilot sequence. Also, the dummy frames' headers and the pilot sequence if available, may be transmitted at a reduced power.