Distributed Channel Emulation System for RF Path Loss Reduction
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Solution Overview
Problem
Current RF channel emulators face limitations in producing a scalable and efficient over-the-air testing environment due to physical constraints, such as the need for a large number of antennas and amplifiers, which results in significant RF path losses and increased costs, especially as the frequency and size of the test volume increase.
Innovation Solution
A distributed channel emulation system is implemented, where the functions of a spatial channel emulator are split between a central location and a remote location within the test chamber, using up and down converters at the remote location to minimize RF signal losses by transmitting intermediate frequency or baseband signals, and moving power amplification directly to the antennas to reduce path losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large number of antennas and amplifiers are used to produce sufficient output channels, then the channel emulation capability is improved, but the RF path losses increase and system cost increases
Solution Approach 1:
The system divides the boundary array into multiple distributed nodes, each with its own channel emulator and antenna subset. This segmentation allows independent optimization of each node's RF path length, reducing overall path losses while maintaining comprehensive channel emulation capability across the test volume.
Solution Approach 2:
The patent transitions from a centralized single-point channel emulation architecture to a distributed multi-node spatial architecture. By adding the spatial dimension of distribution, the system reduces RF path losses through shorter individual paths while maintaining or enhancing channel emulation versatility through coordinated multi-node operation.
2Adaptability or versatility
If the frequency range is increased to microwave and milli-meter wave, then the testing capability is improved, but the RF path losses increase significantly
Solution Approach 1:
By segmenting the system into distributed nodes, each handling a portion of the frequency spectrum and spatial coverage, the patent enables high-frequency testing with reduced path losses. Each node can be optimized for specific frequency ranges, and the distributed architecture ensures that no single RF path becomes excessively long at microwave and milli-meter wave frequencies.
3Volume of moving object
If the test volume size is increased, then the testing coverage is improved, but the number of antennas and amplifiers must increase, resulting in increased RF path losses
Solution Approach 1:
The patent applies segmentation by dividing the large test volume into multiple zones, each served by a distributed node with its own antenna array and channel emulator. This allows the system to cover a large overall volume while maintaining short RF paths within each local zone, thereby reducing path losses despite the increased total test volume.
Solution Approach 2:
The distributed node architecture adds spatial distribution as a new dimension, allowing the system to scale test volume capacity without proportionally increasing RF path losses. Each node independently serves its local volume, and the collective coverage expands the total testable volume while maintaining efficient local RF paths.
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 approach reduces signal loss and improves system efficiency by allowing for higher frequency testing with lower loss cables, enhancing the scalability and cost-effectiveness of RF channel emulation systems while maintaining accurate signal replication and impairment simulation.
Implementation Method 1
an up-converter configured to up-convert an impaired signal of the emulated channel to produce a radio frequency, RF, signal
Implementation Method 2
a down-converter configured to down-convert an RF signal to produce a baseband signal
Data Source
AI summary
A method and system for measuring a device under test are disclosed. Some embodiments include a distributed channel emulation system implementing a downlink channel, including at a central location, an emulator core configured to introduce an impairment in each of at least one transmit signal to produce at least one impaired signal for each of at least one emulated channel. The system includes, at a remote location, for each of at the least one emulated channel, an up-converter configured to up-convert an impaired signal of the emulated channel to produce a radio frequency, RF, signal.