OTA MIMO Test Chambers With Controlled Multipath Corridors
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Solution Overview
Problem
Existing test environments for wireless systems, such as shielded rooms and anechoic chambers, fail to provide a compact and realistic multipath scenario that accurately replicates real-world conditions for Multiple Input Multiple Output (MIMO) systems, as they either produce excessive or insufficient multipath propagation, and are not easily scalable for testing various path lengths and interference scenarios.
Innovation Solution
A system comprising partially absorber-lined anechoic chambers connected by propagation path corridors of different lengths, with positionable stir paddles and antennas, allows for the creation of a controlled and variable multipath environment that mimics real-world conditions by selectively absorbing and reflecting signals to achieve the desired decay profile and path lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If shielded rooms are used for testing, then isolation from outside interference is achieved, but excessive multipath propagation occurs
Solution Approach 1:
The patent applies local quality by using partially absorber-lined chambers instead of fully shielded rooms. The absorptive and reflective properties are locally varied within the chamber to create controlled multipath propagation, allowing isolation from outside interference while preventing excessive multipath effects through selective placement of absorptive materials.
Solution Approach 2:
The patent changes the parameters of the test environment by using variable path simulators and positionable stir paddles to dynamically adjust path lengths and multipath characteristics. This allows the system to maintain isolation while controlling multipath propagation levels to match realistic scenarios.
2Object-generated harmful factors
If anechoic chambers are used for testing, then multipath propagation is reduced, but unrealistic test conditions result
Solution Approach 1:
The patent uses partially absorber-lined chambers rather than fully anechoic chambers. By selectively placing absorptive materials in certain locations while leaving other areas reflective, the system creates controlled multipath propagation that realistically simulates indoor wireless environments while maintaining sufficient multipath control for reliable testing.
Solution Approach 2:
The patent employs variable path simulators and positionable stir paddles that can dynamically adjust the multipath environment during testing. This allows the system to transition between different multipath conditions, providing both control and realism by simulating varying indoor propagation scenarios.
3Reliability
If fixed test environments are used, then test repeatability is achieved, but adaptability to different path lengths and scenarios is limited
Solution Approach 1:
The patent implements dynamic test environments using variable path simulators and positionable components that can be adjusted between tests. The system maintains repeatability through controlled positioning and simulation of standardized channel models while achieving adaptability by reconfiguring path lengths and multipath characteristics for different testing scenarios.
Solution Approach 2:
The patent creates a universal test environment that can simulate multiple indoor channel models (802.11n standards) and various propagation scenarios within a single chamber configuration. The variable path simulators and adjustable components allow the same physical space to reliably reproduce different path lengths and multipath conditions required for comprehensive MIMO system testing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables efficient and repeatable over-the-air testing of MIMO systems by providing a compact, realistic, and scalable multipath environment that accurately replicates the 802.11n channel models, reducing the impact of extraneous interference and allowing for the testing of various modes of operation.
Implementation Method 1
partially absorber-lined anechoic chambers... selectively absorbing and reflecting signals to achieve the desired decay profile
Implementation Method 2
positionable stir paddles and antennas... reflecting signals to achieve the desired decay profile and path lengths
Data Source
AI summary
Embodiments include systems and methods for over-the-air testing of wireless systems. Embodiments comprise separated anechoic chambers containing wireless devices. The anechoic chambers are connected by propagation path corridors.