Shared FIR Filtering for MIMO Multi-Path Fading Simulation
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Solution Overview
Problem
Existing methods for simulating dynamic multi-path fading in MIMO communication channels are inefficient, as they require multiple independent FIR filters, which are computationally intensive and less efficient than a single high-speed, long tap-count filter.
Innovation Solution
A single finite impulse response (FIR) filter is used in conjunction with an input multiplexer and output decimator to emulate multiple filters, interleaving samples and applying independent filtering to each, thereby reducing computational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple independent FIR filters are used to simulate MIMO multi-path fading, then each signal channel can be filtered independently, but the computational complexity and resource requirements increase significantly
Solution Approach 1:
The patent combines multiple independent FIR filters into a single shared filter structure. The same filter coefficients and computational resources are reused across multiple input and output channels through a unified filtering operation, eliminating the need for separate filter instances for each channel pair.
Solution Approach 2:
The single FIR filter is designed to serve multiple functions simultaneously by processing multiple input channels and generating multiple output channels. The filter structure is universalized to handle MIMO multi-path fading simulation for all channel combinations through a common computational engine.
2Manufacturing precision
If multiple independent FIR filters are implemented, then independent filtering is applied to each signal, but the computational rate and processing efficiency decrease
Solution Approach 1:
Multiple filtering operations are merged into a single computational pass. The system performs filtering for all MIMO channels simultaneously by reusing the same filter coefficients and computational resources, thereby increasing the overall computational rate while preserving filtering precision.
Solution Approach 2:
The shared filter structure enables continuous processing of multiple channels without the overhead of repeatedly initializing and executing separate filter instances. The computational action is sustained and optimized across all channels through a unified processing pipeline.
3Productivity
If a single filter is used to emulate multiple filters, then computational complexity is reduced, but the device complexity increases due to multiplexer and decimator components
Solution Approach 1:
The patent introduces multiplexer and decimator components as intermediary elements that manage the flow of signals between the single shared filter and multiple input/output channels. These intermediaries enable the filter to serve multiple functions while maintaining a streamlined computational structure.
Solution Approach 2:
The system transforms the filtering problem from multiple independent one-dimensional filter operations into a single multi-dimensional processing operation. By organizing the MIMO channels in a structured interleaved format, the patent enables efficient processing through a unified filter that operates on a higher-dimensional data structure.
Data Source
AI summary
A single finite impulse response filter designed to operate on a single signal is used in conjunction with an input multiplexer that interleaves samples from multiple signals and an output decimator. The output of the decimator contains interleaved samples of the multiple signals with independent filtering applied to each.