Satellite Signal Frame Tagging for Baud Rate Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The average bit rate through user terminals in satellite systems is limited by channel decoder capacity, restricting the maximum baud rate in forward link applications, where not all frames need to be processed at all destinations.
Innovation Solution
Implementing a method where receivers identify and decode only frames destined for their specific group by using a frame tag field in the signal header, reducing unnecessary decoding and thus lowering the average bit rate through the channel decoder, allowing higher baud rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all frames are decoded at all destinations to ensure complete signal processing, then reliability is improved, but channel decoder capacity is exceeded and baud rate is limited
Solution Approach 1:
The invention segments the frame stream by inserting a frame tag field that identifies destination groups. Receivers are segmented into specific destination groups and only decode frames tagged with their group identifier, dividing the decoding workload across multiple receivers rather than requiring all receivers to process all frames.
Solution Approach 2:
The invention extracts only the necessary frames for each receiver by using the frame tag field to identify and select frames destined for specific destination groups. Each receiver extracts and decodes only the subset of frames relevant to its destination group, eliminating unnecessary decoding operations.
2Productivity
If channel decoder capacity is increased to handle higher baud rates, then productivity is improved, but device complexity and cost increase
Solution Approach 1:
The invention applies partial action by having receivers decode only a portion of the total frames (those tagged for their destination group) rather than all frames. This reduces the decoding capacity required at each receiver, allowing the system to achieve higher overall baud rates without requiring proportionally higher decoder capacity at each endpoint.
3Productivity
If frame tagging is implemented to enable selective decoding, then channel decoder time is reduced and baud rate increases, but signal structure complexity increases
Solution Approach 1:
The frame tag field is inserted into the signal header during the encoding phase, before transmission. This preliminary tagging action allows receivers to identify and select relevant frames through simple header inspection without requiring complex processing during decoding, reducing decoder time and enabling higher baud rates.
Data Source
Figure 1~3
Figure 2
Figure 4~5
AI summary
In high speed applications, the decoder is the limiting factor for the maximum baudrate in the FW link. In applications, however, where not all frames need to be processed at all destinations, quite some decoder time can be saved, if the receiver 'knows' in advance (i.e. before decoding) the destination of a frame, simply by ignoring the unwanted frames. A satellite broadcasting system is described using a signal having up to three fields: a frame tag field for frame tagging to define one of a plurality of destination groups, a modcode field for defining one of a plurality of modulation codes and a type field for defining whether pilot signals are used or not.