Digital Switch Matrix Layout for Delay-Uniform Beam Routing
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Solution Overview
Problem
Existing multi-beam satellite communication systems face issues with increased circuit size, power consumption, and time delays due to the use of grid-like digital switch matrices, which require additional buffers and longer calculation times for routing settings as the number of beams increases.
Innovation Solution
A satellite communication system with a switch unit that receives time-division multiplexed data and routes it without causing delays, using a configuration with reduced memory requirements and a method to calculate setting values quickly, allowing for a compact and low-power digital switch matrix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a grid-like digital switch matrix is used to handle multiple beams, then routing flexibility is improved, but circuit size increases
Solution Approach 1:
The digital switch matrix is segmented into multiple switching modules arranged in a grid, where each module handles a subset of beams. This segmentation allows the system to achieve routing flexibility for multiple beams while keeping each individual module's circuit size manageable, avoiding the need for a single large monolithic switch matrix.
Solution Approach 2:
The switch matrix transitions from a one-dimensional linear arrangement to a two-dimensional grid structure. This dimensional change allows the system to handle N beams using approximately sqrt(N) switching modules instead of N individual modules, significantly reducing the overall circuit size while maintaining routing flexibility through the grid's multi-path capabilities.
2Adaptability or versatility
If a grid-like digital switch matrix is used to handle multiple beams, then routing flexibility is improved, but power consumption increases
Solution Approach 1:
The digital switch matrix is divided into multiple independent switching modules in a grid configuration. Each module consumes power independently and can be activated only when needed for specific routing operations. This segmentation reduces total power consumption compared to a monolithic switch matrix that would require all components to be active simultaneously.
Solution Approach 2:
The switching modules dynamically activate only the necessary paths for current routing operations. In a grid structure, not all modules need to be active simultaneously - only those required for the current set of beam routings. This dynamic activation pattern significantly reduces power consumption while maintaining routing flexibility when needed.
3Reliability
If buffers are added to each switching module to eliminate delay differences, then routing delay uniformity is improved, but circuit size increases
Solution Approach 1:
The grid structure provides multiple parallel paths between input and output ports. By strategically routing signals through different numbers of switching modules and using the grid's geometric properties, the system achieves uniform effective delay across all paths without requiring additional buffering components, thus avoiding the area increase that would result from adding buffers to each module.
4Adaptability or versatility
If the number of switching modules is increased to handle more beams, then beam capacity is improved, but calculation time for routing settings increases
Solution Approach 1:
The grid structure segments the switching functionality into modular units arranged systematically. This segmentation enables the use of efficient routing algorithms that can calculate settings for large numbers of beams by breaking down the problem into smaller sub-problems for each module, significantly reducing the overall calculation time compared to optimizing a monolithic switch matrix.
Solution Approach 2:
The systematic grid arrangement allows routing calculations to be performed in a staged manner, calculating settings for subsets of beams and modules separately before combining results. This partial action approach reduces the computational complexity from exponential to polynomial time, enabling the system to handle increased beam capacity without proportionally increasing calculation time.
Data Source
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AI summary
Provided is a digital switch including: a plurality of input-side memories, which are arranged in a one-to-one correspondence with a plurality of input ports, and are configured to accumulate time-division multiplexed data; a plurality of output-side memories, which are arranged in a one-to-one correspondence with a plurality of output ports, and are configured to accumulate time-division multiplexed data; and a switch matrix configured to receive, as input, the time-division multiplexed data read out in every cycle from each of the plurality of input-side memories, and execute routing for selecting, in accordance with a connection control signal received from outside, any one of the plurality of output-side memories such that the time-division multiplexed data read out in every cycle is output from each of the plurality of output ports without causing a difference in delay, to output the time-division multiplexed data.