VSAT Terminal Blind Synchronization for Mesh Latency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing satellite-based VSAT networks face challenges in time synchronization and interference management between remote user terminals, particularly in mesh topologies where direct communication is desired without relying on a centralized hub, especially for latency-sensitive applications like VoIP in offshore drilling sites.
Innovation Solution
A remote user terminal capable of operating in both star and mesh topologies, utilizing a blind synchronization module and multi-channel demodulator to derive a master time reference independently, allowing direct communication between terminals while maintaining non-interfering transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If remote terminals communicate directly in mesh topology without hub, then communication latency is reduced and network capacity is enhanced, but time synchronization and interference management become more difficult
Solution Approach 1:
Each remote terminal independently derives its own timing reference by processing received signals from other terminals, without requiring the hub to provide centralized timing information. The terminal uses its received signal to determine timing offset and generates local timing references for transmission, enabling autonomous time synchronization in mesh topology.
2Adaptability or versatility
If remote terminals derive timing reference independently in mesh topology, then hub dependency is reduced and direct communication is enabled, but the difficulty of detecting and measuring timing parameters increases
Solution Approach 1:
The terminal measures timing parameters by analyzing feedback information contained in received signals from other terminals. It determines timing offset based on the received signal characteristics and uses this feedback to adjust its own transmission timing, enabling accurate synchronization through iterative measurement and adjustment.
3Adaptability or versatility
If VSAT network operates in mesh topology for direct communication, then network flexibility is improved, but the device complexity for maintaining synchronization increases
Solution Approach 1:
The remote terminal is designed with multi-functionality to operate in both star topology (communicating through hub) and mesh topology (direct communication). The terminal can adapt its synchronization method based on the operating mode, using hub-provided timing in star mode and independently derived timing in mesh mode, thereby reducing overall system complexity while maintaining versatility.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A mesh receiver, computer readable storage medium and method for a very small aperture terminal (VSAT) performing communications in a satellite-based network. The mesh receiver includes a receiver that receives a plurality of TDMA mesh carriers simultaneously in the network in plural channels. The mesh carriers have a transmitted frequency, transmitted gain, and transmitted timing that is unknown to the mesh receiver. The mesh receiver also includes circuitry configured to blindly derive gain, frequency, and timing values from the received mesh carriers, and a demodulator that demodulates the received TDMA mesh carriers and generates demodulated bursts for packets of the communications based on the blindly derived gain, frequency, and timing values.