Antenna Evaluation Apparatus for MIMO Multipath Simulation
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Solution Overview
Problem
Current antenna evaluation methods for MIMO wireless communication systems fail to accurately create multipath propagation environments with different fadings and delays for various substreams, which are essential for evaluating the performance of receiving antennas effectively.
Innovation Solution
An antenna evaluation apparatus is designed with multiple signal generators, delaying means, and radio frequency circuit means to create independent delays and adjust phases and amplitudes of radio frequency signals, producing uncorrelated fadings and delays around receiving antennas, simulating various propagation paths and clusters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single fading is applied to all substreams in MIMO systems, then the device complexity is reduced, but the measurement precision of transmission characteristics deteriorates
Solution Approach 1:
The patent divides the signal processing into separate paths for each substream. Each substream receives independent fading application through separate signal processing chains, allowing different fading characteristics to be applied to different substreams while maintaining manageable complexity through modular architecture.
Solution Approach 2:
The patent extends the fading processing from a single-dimensional common fading to multi-dimensional independent fadings across different substream dimensions. This allows the system to simulate realistic multipath environments where different spatial streams experience different fading conditions.
2Measurement precision
If independent delays and fadings are applied to each substream, then the measurement precision of transmission characteristics is improved, but the device complexity increases
Solution Approach 1:
The patent segments the signal processing into independent processing chains for each substream, where each chain applies delays and fadings independently. This modular segmentation enables accurate simulation of multipath environments while keeping each processing unit manageable in complexity.
Solution Approach 2:
The patent implements dynamic and adjustable delay and fading parameters for each substream, allowing the system to adaptively simulate various propagation conditions. The independent processing chains can be dynamically configured to match different channel characteristics.
3Measurement precision
If realistic multipath propagation environments are created for MIMO systems, then the measurement precision of antenna performance is improved, but the device complexity increases
Solution Approach 1:
The patent divides the evaluation apparatus into separate processing chains for each substream, with each chain independently generating and applying multipath propagation effects. This segmentation enables realistic simulation while maintaining modular architecture that manages overall system complexity.
Solution Approach 2:
The patent extends the multipath simulation to multiple dimensions by applying independent delays and fadings across different substream dimensions. This creates a more realistic three-dimensional multipath environment for MIMO antenna evaluation.
Data Source
AI summary
An antenna evaluation apparatus includes receiving antennas to be evaluated, scatterer antennas provided around them, signal generators, delay circuits, dividers, phase-shift circuits, and attenuation circuits. A computer controls the delay circuits to add delay times to radio frequency signals, and controls the phase-shift circuits and attenuation circuits to change phases and amplitudes of the radio frequency signals to produce a first fading. The antenna evaluation apparatus radiates the radio frequency signals from the scatterer antennas, thus creating multipath waves including delay and fading around the receiving antenna.