Dynamic Scene Channel Model Construction in 4D-MPAC
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Solution Overview
Problem
Current Multi-Probe Anechoic Chamber (MPAC) technology is inadequate for simulating dynamic channel changes in high-speed motion scenes, such as those involving 6G systems with high mobility, as it primarily addresses static spatial parameters and lacks a systematic method for multi-time point testing, leading to inaccurate communication performance evaluation.
Innovation Solution
A four-dimensional over-the-air performance test method that models dynamic scene channels by discretizing time into moments, simulating spatial channel models at each moment, correcting for relative line-of-sight directions, and using a probe selection algorithm to reduce the number of channel simulator ports, while introducing a four-dimensional power spectrum similarity percentage for evaluating construction quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If probe configuration is optimized for a certain time moment, then channel simulation accuracy is improved at that moment, but simulation accuracy deteriorates at other time moments due to time-domain non-stationarity
Solution Approach 1:
The patent transforms the static probe configuration optimization into a dynamic process by introducing time-varying optimization. The probe selection is no longer fixed for a single time moment but is optimized across multiple time moments, allowing the system to adapt to time-domain non-stationary characteristics. This is achieved through multi-time point channel simulation that captures the evolving channel properties during high-speed motion.
Solution Approach 2:
The patent adds a time dimension to the traditional spatial-only probe optimization problem. By considering multiple time moments in the optimization process, the system transitions from optimizing for a single static configuration to optimizing for a time-varying sequence of configurations. This dimensional expansion enables the system to handle dynamic scenes where channel characteristics change over time.
2Measurement precision
If multiple antenna probes are arranged to simulate multiple angles of incidence, then spatial channel environment simulation is improved, but test system cost increases due to more channel simulator ports
Solution Approach 1:
The patent makes the probe configuration serve multiple functions: it simultaneously optimizes for channel simulation accuracy across multiple time moments while reducing the total number of channel simulator ports required. The multi-time point optimization identifies redundant probes that can be shared across different time moments, making each probe more versatile and reducing overall system complexity.
Solution Approach 2:
The patent changes the optimization parameters from single-time-point spatial parameters to multi-time-point spatiotemporal parameters. By optimizing probe selection based on channel characteristics across multiple time moments, the system achieves better spatial simulation accuracy with fewer probes, thereby reducing the number of expensive channel simulator ports needed.
3Ease of operation
If static evaluation criteria are used for channel simulation accuracy, then single-time-point testing is simplified, but dynamic scene channel simulation accuracy deteriorates
Solution Approach 1:
The patent replaces static evaluation criteria with dynamic evaluation criteria that assess channel simulation accuracy across multiple time moments. This dynamic evaluation captures the time-varying nature of high-speed channels and provides a more accurate measure of simulation quality, even though it increases operational complexity compared to single-time-point evaluation.
Data Source
AI summary
The present disclosure discloses a four-dimensional over the air performance test method for a dynamic scene channel. By constructing a time-domain non-stationary dynamic scene channel model, and selecting over the air (OTA) probes of appropriate number, positions and power weight in a four-dimensional multi-probe anechoic chamber (4D-MPAC) test system through a probe selection algorithm, finally a 4D-MPAC dynamic channel test system for a target channel in a DUT test area is constructed, which makes a contribution to solve the current problem of OTA performance test for a time-domain non-stationary channel. The present disclosure aims to provide a four-dimensional multi-probe anechoic chamber (4D-MPAC) for the dynamic scene channel, which can effectively and accurately reproduce a target dynamic scene channel model in an anechoic chamber on the basis of reducing the cost of the test system as much as possible by constructing the dynamic scene channel model, and provide an index for judging the accuracy of constructing the dynamic scene channel model.