MIMO Testing Device Frequency Domain Signal Processing

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Solution Overview

Problem

The existing testing devices for MIMO systems with a large number of arrayed transmitting antennas face significant challenges in reducing circuit scale and power consumption, particularly when implementing multicarrier modulation, MIMO schemes, and beam forming processes, leading to increased manufacturing costs and complexity.

Innovation Solution

The proposed solution involves a device and method that generate receiving signals using a pseudo propagation channel, incorporating layer frequency domain signal generation, propagation channel arithmetic operations, Fourier transform, window function processing, and time domain signal generation to reduce the circuit scale and power consumption, while maintaining accurate propagation channel characteristics simulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If beam forming process is implemented with a large number of arrayed transmitting antennas, then radiation efficiency and directionality are improved, but circuit scale and device complexity increase significantly

Engineering Contradiction:

Improveradiation efficiencyVSAvoidcircuit scale

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

The patent changes the computational domain from time domain to frequency domain for beam forming operations. By performing arithmetic operations in the frequency domain, the system avoids complex time-domain signal processing circuits, thereby reducing circuit scale while maintaining beam forming functionality and radiation efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces physical time-domain signal processing hardware with frequency-domain computational methods. This substitution eliminates the need for large-scale inverse Fourier transform circuits and complex propagation channel characteristic generation circuits, significantly reducing device complexity while preserving the essential beam forming function

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If inverse Fourier transform and propagation channel characteristic generation circuits are implemented, then accurate propagation channel simulation is achieved, but power consumption and circuit scale increase

Engineering Contradiction:

Improvepropagation channel simulation accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent changes the operational domain from time domain to frequency domain, performing all propagation channel simulations and signal processing operations in the frequency domain. This approach maintains simulation accuracy while eliminating the need for power-intensive inverse Fourier transform circuits and complex time-domain processing hardware

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

Instead of performing forward inverse Fourier transform operations to generate time-domain signals for testing, the patent inverts the approach by directly generating frequency-domain signals with embedded propagation channel characteristics. This inversion eliminates the need for complex time-domain generation circuits and reduces power consumption while maintaining simulation fidelity

Inventive Principle:

Principle #13The other way round (Inversion)

3Manufacturing precision

If time domain signal processing is performed for each transmitting antenna, then accurate beam forming is achieved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improvebeam forming accuracyVSAvoidmanufacturing cost

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent changes the processing domain from time domain to frequency domain for beam forming operations. By performing arithmetic operations in the frequency domain, the system achieves accurate beam forming with simplified circuitry, reducing manufacturing complexity and cost while maintaining the required precision

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent merges multiple time-domain processing functions into a single frequency-domain processing framework. By combining propagation channel simulation, beam forming, and signal generation into unified frequency-domain arithmetic operations, the system reduces the number of separate circuits needed, simplifying manufacturing while preserving beam forming accuracy

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS10432282B2Device and method for testing MIMO scheme system

Publication Date: 2019.10.01 ANRITSU CORP

AI summary

The present application relates to a technique for reducing the circuit scale of a testing device having a function of performing a fading process with respect to a propagation channel of S×U channels assumed between transmitting and receiving antennas, using a terminal compatible with MIMO for transmitting a downlink signal from a base station to a mobile terminal with the number of base station-side antennas S and the number of terminal-side antennas U, or a circuit substrate, an integrated circuit and the like built into the terminal, as a test object. The multiplication arithmetic operation of the characteristics of the propagation channel and the modulation signal is performed in the frequency domain, and a time domain signal is generated from the arithmetic operation result. It's possible to considerably reduce the scale of a circuit that performs inverse Fourier transform and the scale of a circuit that generates propagation channel characteristics.