Spot Beam Satellite Broadcast Mode Switching
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Solution Overview
Problem
Existing satellite systems require reconfiguration when switching between spot beam and broadcast transmission modes, which is inefficient and costly due to the confined nature of spot beam signals and the wide coverage of broadcast satellites.
Innovation Solution
Implementing a satellite system that uses space-time encoding to enable spot beam satellites to transmit broadcast data over a wide geographical area using the same frequency, eliminating interference between adjacent beams and allowing for flexible operation between spot beam and broadcast modes without reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If spot beam satellites use confined signals for localized content delivery, then frequency reuse is facilitated and receiver design is simplified, but the satellite cannot provide broadcast services over wide geographical areas
Solution Approach 1:
The patent applies dynamics by making the spot beam satellite's transmission mode adjustable and reconfigurable. The satellite can dynamically switch between spot beam mode (for localized content) and broadcast mode (for wide-area coverage) based on service requirements, thereby resolving the contradiction between confined signal coverage and wide-area broadcast capability
Solution Approach 2:
The patent implements multi-functionality by enabling the spot beam satellite to perform both spot beam transmission and broadcast transmission functions. This allows a single satellite to serve multiple purposes - localized content delivery and wide-area broadcasting - eliminating the need for separate satellites for different service modes
2Area of stationary object
If broadcast satellites produce a single large beam for wide coverage, then broadcast services over vast geographical areas are enabled, but frequency reuse is limited and receiver design becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the wide coverage area into multiple spot beam coverage areas. Each spot beam covers a localized region, allowing receivers to detect which specific beam they are receiving and to use simpler processing logic appropriate for spot beam signals, thereby reducing receiver complexity while maintaining wide-area coverage capability
3Productivity
If spot beam satellites transmit on the same frequency across multiple beams, then frequency reuse is maximized, but signal interference occurs between adjacent beams
Solution Approach 1:
The patent converts the potential harm of signal interference into a benefit by using space-time encoding. This encoding technique is specifically designed to handle and eliminate interference between signals transmitted on the same frequency from adjacent spot beams, allowing maximum frequency reuse without the harmful interference effects
Data Source
AI summary
Techniques for providing broadcast services on spot beam satellite are provided. These techniques enable the mission of a spot beam satellite system to be changed from providing spot beam transmission to broadcast transmissions, and vice versa, without requiring that the satellite be reconfigured. Broadcast data may be encoded and transmitted concurrently on a plurality of spot beams. According to some embodiments, the broadcast data may be encoded using a space-time code and/or forward error corrected (FEC) encoded to enable a receiver to correct errors in the signal received from the spot beam satellite.