Boundary Detection Device for Wireless Synchronization

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Solution Overview

Problem

Existing synchronization technologies in wireless communication systems, particularly in IEEE 802.11 standards, face challenges in accurately detecting peaks due to cyclic shift and frequency selective fading, leading to unreliable synchronization, especially in low SNR environments and configurations using multi-antenna transmission.

Innovation Solution

A boundary detection device employing a decorrelation filter that reduces the level of repetitive training sequences to zero, while maintaining signal levels for other signals, allowing for robust synchronization by detecting increases in output values at sequence boundaries, thereby mitigating the effects of cyclic shift and frequency selective fading.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If peak detection of cross-correlation is used for synchronization, then synchronization can be achieved, but reliability deteriorates under cyclic shift and frequency selective fading

Engineering Contradiction:

Improvesynchronization reliabilityVSAvoidpeak detection accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent extracts and removes the harmful influence of cyclic shift and frequency selective fading from the synchronization process by applying a decorrelation filter that eliminates periodic components caused by these effects, allowing reliable synchronization without peak detection

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces a decorrelation filter as an intermediary component between the received signal and the synchronization detection, which mediates by removing correlated interference patterns while preserving the synchronization signal characteristics

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If cross-correlation peak detection is used, then synchronization is achieved, but performance deteriorates in low SNR environments

Engineering Contradiction:

Improvesynchronization reliability in low SNRVSAvoidpeak detection precision

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent converts the harmful effect of noise in low SNR environments into a benefit by using the decorrelation filter to remove structured interference, making the synchronization detection more robust to random noise through the enhanced signal-to-interference ratio

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If training sequences are used for synchronization, then synchronization is achieved, but the same sequences cause interference due to cyclic shift

Engineering Contradiction:

Improvesynchronization reliabilityVSAvoidcyclic shift interference

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent extracts and removes the harmful cyclically-shifted components from the received signal using the decorrelation filter, separating the useful synchronization information from the interfering cyclic patterns generated by multiple antennas

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS10091043B2Boundary detection device and wireless communication device including the same

Publication Date: 2018.10.02 INT SEMICON GRP

AI summary

A boundary detection device includes a decorrelation filter and a boundary detector. The decorrelation filter is configured to output an output signal that has a decreased level with respect to an input signal when the input signal has a predetermined signal pattern, and that has a non-decreased level with respect to the input signal when the input signal does not have the predetermined signal pattern. The boundary detector is configured to detect an end of the predetermined signal pattern in the input signal, based on the output signal.