MIMO Wireless Modulation Switching for Multi-Path Channel Adaptation

Solution Overview

Problem

Current MIMO wireless communication systems face challenges in efficiently selecting between spatial-multiplexing and frequency-multiplexing modulation methods based on channel quality, leading to suboptimal performance in varying environments with different multi-path effects.

Innovation Solution

A wireless communication device that selectively chooses between spatial-multiplexing and frequency-multiplexing modulation methods by evaluating channel quality, using a controller to switch between modems implementing these methods, thereby optimizing data transmission and reception across multiple antennas and channels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If spatial-multiplexing modulation method is used, then data transmission efficiency is improved through parallel transmission over multiple antennas, but system performance deteriorates in environments with strong multi-path effects

Engineering Contradiction:

Improvedata transmission efficiencyVSAvoidsystem performance in multi-path environment

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system dynamically switches between spatial-multiplexing and frequency-multiplexing modulation methods based on real-time channel quality assessment. The controller monitors channel conditions and selects the appropriate modulation method, making the system adaptive to changing environmental conditions rather than fixed to one method

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the modulation method parameter based on channel quality metrics. When channel quality exceeds a threshold, spatial-multiplexing is used; when below threshold, frequency-multiplexing is used. This parameter switching optimizes performance across different environmental conditions

Inventive Principle:

Principle #35Parameter changes

2Reliability

If frequency-multiplexing modulation method is used, then system reliability is improved in multi-path environments, but data transmission throughput is reduced compared to spatial-multiplexing

Engineering Contradiction:

Improvesystem performance in multi-path environmentVSAvoiddata transmission throughput

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The system dynamically switches between spatial-multiplexing and frequency-multiplexing modulation methods based on real-time channel quality assessment. The controller monitors channel conditions and selects the appropriate modulation method, making the system adaptive to changing environmental conditions rather than fixed to one method

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the modulation method parameter based on channel quality metrics. When channel quality exceeds a threshold, spatial-multiplexing is used; when below threshold, frequency-multiplexing is used. This parameter switching optimizes performance across different environmental conditions

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If a fixed modulation method is used, then device complexity is reduced, but adaptability to varying channel conditions deteriorates

Engineering Contradiction:

Improvemodulation method configurationVSAvoidchannel condition adaptation

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The system dynamically switches between spatial-multiplexing and frequency-multiplexing modulation methods based on real-time channel quality assessment. The controller monitors channel conditions and selects the appropriate modulation method, making the system adaptive to changing environmental conditions rather than fixed to one method

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system uses channel quality feedback to automatically select the appropriate modulation method. The controller continuously monitors channel conditions and adjusts the modulation method accordingly, creating a closed-loop control system that adapts to varying conditions

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS7443818B2Method, apparatus and system of multiple-input-multiple-output wireless communication

Publication Date: 2008.10.28 INTEL CORP

AI summary

Embodiments of the present invention provide a method, apparatus and system for selectively modulating a data frame of a signal using either a frequency-multiplexing modulation method or a spatial-multiplexing modulation method based on a predetermined criterion.