Analog Equalizer Network for Wideband LoS-MIMO Channel Separation

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Solution Overview

Problem

Conventional MIMO processing methods face challenges in wideband signal processing due to low signal-to-interference-plus-noise ratio (SINR) performance and inability to compensate for time delays in asymmetric channel matrices, limiting data transmission rates in high-frequency wireless communication.

Innovation Solution

An analog equalizer network apparatus using a power distributor, delay lines, phase shifters, and a power combiner to perform channel separation, compensating for time delays and frequency dependencies in wideband LoS-MIMO networks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a conventional phase shifter is used for MIMO processing, then the device complexity is reduced, but the signal-to-interference-plus-noise ratio (SINR) performance deteriorates for wideband processing

Engineering Contradiction:

Improvedevice complexityVSAvoidSINR performance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The channel separation function is segmented into multiple frequency-specific operations. The analog equalizer processes different frequency components separately through parallel processing paths, allowing optimal phase and amplitude adjustment for each frequency band, thereby improving SINR performance across the wideband spectrum while maintaining manageable device complexity through modular architecture

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system transitions from static phase shifting to dynamic equalization by implementing frequency-dependent phase and amplitude adjustments. The analog equalizer dynamically adapts its response across different frequencies to compensate for channel variations, achieving high SINR performance across the entire wideband spectrum rather than at a single frequency point

Inventive Principle:

Principle #15Dynamics

2Device complexity

If a conventional phase shifter is used, then the device complexity is reduced, but the ability to compensate for time delay deteriorates in asymmetric channel matrices

Engineering Contradiction:

Improvedevice complexityVSAvoidtime delay compensation capability

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The time delay compensation is segmented into frequency-specific delay adjustments. Each frequency component undergoes independent delay compensation through the analog equalizer, allowing precise correction of asymmetric channel delays without requiring a complex monolithic delay compensation mechanism

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system changes the parameter of phase shift to be frequency-dependent rather than constant. The analog equalizer applies different phase and amplitude parameters at different frequencies, enabling it to compensate for time delays in asymmetric channel matrices while maintaining a relatively simple device structure through continuous parameter adjustment

Inventive Principle:

Principle #35Parameter changes

3Use of energy by moving object

If digital MIMO processing is used with low voltage resolution, then energy efficiency is improved, but quantization noise increases and precision decreases

Engineering Contradiction:

Improveenergy efficiencyVSAvoidsignal precision

Core Design Contradiction:

Use of energy by moving objectVSMeasurement precision

Solution Approach 1:

The patent replaces digital signal processing operations with analog equalization operations. By performing channel separation and equalization in the analog domain before ADC conversion, the system avoids the quantization noise inherent in digital processing of low-resolution signals, thereby maintaining high signal precision while achieving energy efficiency through reduced ADC resolution requirements

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Productivity

If wired links are used for high-capacity transmission, then data transmission rate is improved, but network scalability deteriorates due to cost

Engineering Contradiction:

Improvedata transmission rateVSAvoidnetwork scalability

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent replaces wired physical links with wireless communication technology. By implementing advanced analog equalization and MIMO processing, the system achieves high-capacity wireless transmission that can scale more flexibly than wired infrastructure, improving both data transmission rates and network scalability simultaneously

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS20260046013A1Analog equalizer networks apparatus for wideband los-MIMO processing

Publication Date: 2026.02.12 POSTECH ACADEMY INDUSTRY FOUNDATION

AI summary

Disclosed is an analog equalizer network apparatus for wideband LOS-MIMO processing, the apparatus according to an embodiment including: a power distributor configured to distribute a first input signal received through a receiving antenna of a wideband LoS-MIMO network to a first path from a first input terminal to a first output terminal, and distribute a second input signal received through the receiving antenna to a second path from a second input terminal to the first output terminal; a first delay line located on the first path, and configured to delay the first input signal distributed to the first path; a second phase shifter located on the second path and configured to shift a phase of the second input signal distributed to the second path; and a power combiner configured to combine the delayed first input signal and the phase-shifted second input signal to perform channel separation.