Adaptive Equalizer Switching for Wireless Signal Compensation

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Solution Overview

Problem

Existing equalizers in wireless communication systems are ineffective in compensating for signals in varying environments or channel conditions, particularly due to their limited tolerance for long delay waves and channel fluctuations.

Innovation Solution

A wireless communication system that includes an estimation observation unit to assess channel conditions, a first equalizer for general compensation, a second equalizer with higher long delay wave tolerance and lower channel fluctuation tolerance, and a control unit to switch between them based on observed conditions, ensuring effective signal compensation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single equalizer is used for signal compensation, then the device complexity is reduced, but the compensation effectiveness deteriorates under varying channel conditions

Engineering Contradiction:

Improveequalizer structureVSAvoidsignal compensation effectiveness

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The system dynamically switches between the first equalizer and the second equalizer based on channel conditions. The control unit selects which equalizer to use by evaluating channel fluctuation characteristics, making the system adaptive rather than static. This resolves the contradiction by allowing the system to maintain simple structure while achieving reliable compensation through dynamic adaptation to varying environments.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the operational parameters by switching between two different equalizer configurations with distinct characteristics. The first equalizer is optimized for certain channel conditions while the second equalizer is optimized for other conditions. This parameter change approach allows the system to maintain effectiveness across varying channel conditions without requiring a single complex equalizer design.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If the equalizer is continuously used in an initialized state, then the device complexity is reduced, but the compensation effectiveness deteriorates due to inability to adapt to channel variations

Engineering Contradiction:

Improveequalizer control mechanismVSAvoidchannel condition adaptation

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The control unit implements dynamic selection between the first equalizer and the second equalizer based on real-time channel condition assessment. This dynamic mechanism allows the system to adapt to varying channel conditions without requiring complex reconfiguration of the equalizers themselves, maintaining simplicity while achieving adaptability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system incorporates feedback mechanisms where the control unit continuously monitors channel conditions and uses this information to determine which equalizer should be active. This feedback loop enables the system to adapt to changing environments by selecting the appropriate equalizer based on current channel characteristics, resolving the contradiction between simple control and adaptive performance.

Inventive Principle:

Principle #23Feedback

3Reliability

If a second equalizer with higher long delay wave tolerance is introduced, then the compensation effectiveness for specific channel conditions is improved, but the device complexity increases

Engineering Contradiction:

Improvelong delay wave compensationVSAvoidequalizer configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The equalization function is segmented into two separate equalizers, each optimized for specific channel conditions. The first equalizer handles general conditions while the second equalizer specifically addresses long delay wave scenarios. This segmentation allows each equalizer to be simpler and more specialized, improving effectiveness for their respective domains without requiring one overly complex universal equalizer.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system achieves multi-functionality by having two equalizers that together can handle a broader range of channel conditions than either could alone. The control unit determines which equalizer to use based on the specific channel characteristics, allowing the system to universally handle both standard and long delay wave conditions through selective deployment of the appropriate equalizer.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11677597B2Wireless communication device, wireless communication system, and wireless communication method

Publication Date: 2023.06.13 NIPPON TELEGRAPH & TELEPHONE CORP

AI summary

A wireless communication device includes an estimation observation unit that observes a channel condition by estimating a tendency of a long delay wave and a channel fluctuation from a received signal in which a training signal is added to a data frame, a first equalizer that compensates for the received signal, a second equalizer that compensates for the received signal with a property of having a higher long delay wave tolerance and a lower channel fluctuation tolerance than the first equalizer, and a control unit that performs control which switches such that the first equalizer or the second equalizer performs compensation for the received signal, on the basis of the channel condition observed by the estimation observation unit.