Massive MIMO Array Testing with Programmable Phase Matrix
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Solution Overview
Problem
The development of 5G wireless communication systems requires efficient testing of massive MIMO arrays, which is hindered by the need for extensive hardware resources, leading to cost and space limitations in testing environments.
Innovation Solution
The use of a programmable radio phase shifter and combining matrix (PSM) in conjunction with a high-fidelity radio channel emulator to emulate signals from a massive MIMO base station to a MIMO mobile unit, creating a virtual propagation environment that simulates line-of-sight and multi-pathing, reducing the hardware requirements for testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If massive MIMO array testing is performed using traditional hardware resources, then testing accuracy and completeness are improved, but hardware cost and space requirements increase significantly
Solution Approach 1:
The patent creates virtual copies of propagation environments through software simulation instead of using physical hardware representations. Channel emulators generate virtual signal paths that replicate real-world propagation characteristics (multipath, shadowing, Doppler) without requiring physical antennas or test chambers, thus reducing hardware while maintaining testing accuracy
Solution Approach 2:
The patent replaces physical mechanical testing systems with electronic/software-based systems. Instead of using actual radio wave propagation through physical space, the system uses digital signal processing and mathematical models to simulate propagation effects, substituting mechanical/physical processes with electronic computations
2Adaptability or versatility
If massive MIMO array testing is performed using traditional hardware resources, then comprehensive propagation scenario coverage is improved, but testing environment space requirements increase
Solution Approach 1:
The patent creates a universal testing platform that can simulate multiple different propagation scenarios (urban, rural, indoor, outdoor, moving, stationary) using a single hardware configuration. The channel emulator software can be reprogrammed to represent different environmental conditions, making the testing system multi-functional without requiring separate physical test chambers for each scenario
Solution Approach 2:
The patent transitions from physical spatial representation of propagation environments to a mathematical/digital dimension. Instead of physically constructing different test chambers for different scenarios, the system uses software parameters and algorithms to represent spatial and environmental variations, adding a computational dimension that replaces physical dimensionality
3Productivity
If classical array modeling via MIMO emulation is used, then system capacity is improved, but implementation complexity and cost increase
Solution Approach 1:
The patent divides the complex MIMO testing system into modular functional components: signal generators, channel emulators, phase shifters, combiners, and receivers. Each module performs a specific function and can be independently configured or replaced, reducing overall system complexity while maintaining high system capacity through coordinated operation of segments
Data Source
AI summary
The disclosed systems and methods for conducted massive MIMO array testing uses an efficient method of utilizing hardware resources for emulating signals from a massive MIMO base station transceiver to a MIMO mobile unit as dictated by a channel model; and also for emulating signals from a MIMO mobile unit to a massive MIMO BS transceiver, as dictated by a channel model. The system uses a phase matrix combiner to emulate the angular behavior of the propagation using virtual probes, combined with a radio channel emulator to create the temporal, multipath, and correlation behavior of the propagation. Using a phase matrix function increases the number of antenna elements that can be utilized in a massive MIMO array emulation while keeping the required number of fading channels within the radio channel emulator at a reduced number, thus forming a cost effective, yet realistic test system for massive MIMO testing.