MIMO Channel Emulation via Virtual Circular Antenna Measurements
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Solution Overview
Problem
Current methods for testing wireless communication networks, especially for evaluating multi-input, multi-output (MIMO) channels, face inefficiencies due to the inability to accurately replicate in-field conditions in laboratory settings, leading to unreliable and time-consuming testing processes.
Innovation Solution
A method and system for emulating MIMO wireless channels by obtaining in-field measurements using a virtual circular antenna (VCA) and configuring channel emulators based on these measurements to recreate the MIMO channel in a laboratory setting, allowing for repeatable and controlled evaluations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If in-field testing is conducted to obtain real-world MIMO channel measurements, then measurement accuracy and reliability are improved, but testing time and complexity increase due to the need for multiple measurements at different antenna positions
Solution Approach 1:
The patent performs preliminary channel measurements in the field using a rotating VCA to capture real-world MIMO channel characteristics before laboratory testing. These preliminary measurements include multiple positions at different angular orientations, and the results are stored as channel impulse responses that will be used to configure the channel emulator for subsequent laboratory evaluations, eliminating the need to repeat time-consuming field measurements in the lab
Solution Approach 2:
The patent creates a virtual copy of the real-world MIMO channel by measuring channel characteristics in the field and using these measurements to configure a channel emulator that replicates the measured channel conditions in the laboratory. The channel emulator generates synthetic channel impulse responses based on the measured data, allowing repeated laboratory testing without returning to the field
2Reliability
If multiple channel measurements are taken at different VCA positions to accurately characterize MIMO channels, then channel emulation accuracy is improved, but device complexity and measurement process complexity increase
Solution Approach 1:
The patent uses a single rotating virtual circular antenna (VCA) to perform multiple measurement functions that would otherwise require multiple fixed antennas. The rotating VCA captures channel characteristics from different angular positions and orientations, enabling comprehensive MIMO channel characterization using one multi-functional device rather than multiple specialized antennas
Solution Approach 2:
The patent introduces a channel emulator as an intermediary device that bridges field measurements and laboratory testing. The emulator receives measured channel impulse responses and generates synthetic channel conditions that replicate real-world MIMO characteristics, serving as a mediator that translates field data into controllable laboratory test environments
3Ease of operation
If laboratory testing is conducted to provide controlled evaluation conditions, then testing controllability is improved, but the ability to replicate real-world conditions deteriorates
Solution Approach 1:
The patent performs preliminary field measurements to capture real-world MIMO channel characteristics before laboratory testing. These measurements include channel impulse responses obtained at multiple rotating VCA positions, and the results are stored and used to configure the channel emulator for subsequent laboratory evaluations, ensuring real-world conditions are preserved in the controlled lab environment
Solution Approach 2:
The patent creates a virtual copy of the real-world MIMO channel by measuring channel characteristics in the field and using these measurements to configure a channel emulator that replicates the measured channel conditions in the laboratory. This allows the lab environment to accurately represent real-world conditions while maintaining full controllability
Data Source
AI summary
A system or method for emulating wireless channels, including a multi-input, multi-output (MIMO) channel, for evaluation of a wireless system is provided. To emulate the wireless channel, a series of in-field measurements of the wireless signal may be obtained and used to configure one or more communication devices for the signal evaluation. A virtual circular antenna may be controlled to obtain a first set of measurements based on a first trigger signal and a second set of measurements based on a second trigger signal delayed from the first trigger signal. The second set of measurements of the wireless signal, in addition to the first set of measurements, may approximate or may be an equivalent of the MIMO channel. The obtained or derived characteristics of the in-field wireless signal may be used to emulate a channel in a laboratory setting to evaluate one or more aspects of a wireless communication system.