Single Gateway Satellite Capacity via Spectral Efficiency
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Solution Overview
Problem
Current multi-beam High-Throughput Satellite (HTS) systems are limited by the number of geographically separated gateways, which restricts satellite capacity and incurs significant costs, as each gateway must be placed far enough apart to avoid mutual interference.
Innovation Solution
A method and system that utilize spectrally efficient coding/modulation in the high Signal-to-Noise Ratio (SNR) uplink portion of a bent-pipe relay, allowing a single gateway to transmit multiple carriers' worth of data, which is then partitioned into multiple downlink signals using high-order constellations and Forward Error Correction (FEC) codes, reducing the need for multiple gateways and increasing satellite capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple gateways are used to increase satellite capacity, then the total data transmission capacity increases, but the geographical separation requirement increases the complexity and cost of the system
Solution Approach 1:
The patent combines multiple gateway functions into a single gateway by using spectral efficiency enhancement techniques. Multiple carriers are multiplexed and transmitted through one gateway, which then relays them to the satellite. This merging approach achieves the capacity of multiple gateways while using only one physical location, resolving the contradiction between increasing satellite capacity and reducing geographical distribution complexity.
Solution Approach 2:
The single gateway is designed to handle multiple carriers and serve multiple downlink beams simultaneously. By making the gateway multi-functional, it can perform the roles of multiple traditional gateways, thereby increasing satellite capacity without requiring multiple geographically separated gateway locations.
2Ease of manufacture
If the number of gateways is reduced to save costs, then the system cost decreases, but the satellite capacity is limited
Solution Approach 1:
The patent changes the spectral efficiency parameter of the uplink transmission by using enhanced modulation and multiplexing techniques. This parameter change allows a single gateway to transmit multiple carriers with higher spectral efficiency, effectively increasing the data transmission capacity without adding more gateways, thus maintaining satellite capacity while reducing system cost.
3Reliability
If geographically separated gateways are used to avoid mutual interference, then signal quality is maintained, but the number of available gateway locations is limited
Solution Approach 1:
The patent segments the data stream into multiple carriers that are multiplexed together. Each carrier can be independently modulated and transmitted, allowing them to be separated and processed individually at the satellite side. This segmentation enables a single gateway to effectively serve multiple downlink beams without mutual interference, as the carriers are kept orthogonal through proper modulation schemes.
Data Source
AI summary
A method and system for providing high throughput communications via a Radio Frequency (RF) satellite are disclosed. The method includes providing a plurality of information bit streams intended for a plurality of downlinks; modulating an uplink stream including the plurality of information bit streams with an uplink modulation scheme to generate an uplink signal; transmitting the uplink signal to the satellite; and partitioning, at the satellite, the uplink signal into a plurality of downlink signals, each one intended for one of the plurality of downlinks. In the method, the uplink stream includes the plurality of information bit streams.