Transceiver Channel State Analyzer for LOS NLOS Classification

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Solution Overview

Problem

Current wireless communication systems face challenges in accurately determining the Line Of Sight (LOS) and Non-Line Of Sight (NLOS) conditions for position determination, leading to inaccuracies in positioning methods such as TDOA, OTDOA, and AoA, due to the lack of effective mechanisms for channel state identification and phase measurement processing.

Innovation Solution

A transceiver system equipped with a measurement unit for detecting the first arriving path and a channel state analyzer that estimates LOS channel conditions by analyzing phase measurements over multiple points in time, enabling classification of channel states as LOS, NLOS, or OLOS, and reporting this information for improved positioning accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional positioning methods (TDOA, OTDOA, AoA) are used without channel state identification, then positioning can be performed with basic equipment, but positioning accuracy deteriorates due to inability to distinguish LOS and NLOS conditions

Engineering Contradiction:

Improvepositioning accuracyVSAvoidchannel state identification mechanism

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent segments the positioning process into distinct channel state identification and positioning execution phases. The channel state analyzer separately evaluates correlation profiles to determine LOS/NLOS conditions before the positioning calculation is performed, allowing the system to select appropriate positioning methods based on channel conditions without complicating the overall positioning architecture

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a channel state analyzer as an intermediary component that processes correlation profiles and provides channel state information to the positioning system. This intermediary analyzes the received signal characteristics and determines LOS/NLOS conditions, enabling the positioning system to make informed decisions about which positioning method to use without directly handling the complex signal processing itself

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If phase measurements are processed without LOS/NLOS classification, then processing is simpler and faster, but measurement reliability deteriorates due to inclusion of faulty NLOS measurements

Engineering Contradiction:

Improvemeasurement reliabilityVSAvoidchannel state analysis mechanism

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by performing channel state analysis and LOS/NLOS classification before the positioning calculation is executed. The channel state analyzer evaluates correlation profiles and determines channel conditions in advance, allowing the system to filter out unreliable NLOS measurements before they can affect positioning accuracy, rather than dealing with measurement validation after the fact

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback by using the channel state analysis results to inform and adjust the positioning process. The determined LOS/NLOS conditions provide feedback that guides the selection of appropriate positioning methods and algorithms, ensuring that measurements are processed with the correct assumptions about signal propagation conditions, thereby improving overall measurement reliability

Inventive Principle:

Principle #23Feedback

3Measurement precision

If channel state identification mechanisms are implemented, then positioning accuracy improves through reliable LOS/NLOS distinction, but processing time increases due to additional analysis steps

Engineering Contradiction:

Improvepositioning accuracyVSAvoidprocessing time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent applies partial action by implementing channel state analysis that focuses specifically on evaluating correlation profiles for LOS/NLOS distinction, rather than performing comprehensive channel characterization. The system performs only the necessary analysis steps required to determine channel state, avoiding unnecessary processing while still achieving improved positioning accuracy through reliable LOS/NLOS identification

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20230314547A1Los, NLOS channel state identification

Publication Date: 2023.10.05 FRAUNHOFER GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG EV

AI summary

Transceiver for receiving a receive signal or the plurality of receive signals to be used for position determination over multiple points of time, the transceiver comprising: a measurement unit configured to perform a measurements to detect an information on a first arriving path, advantageously a time or a direction for a first arriving path; and a channel state analyzer configured to estimate a LOS channel condition to determine a channel state information describing the condition of the FAP.