Rotational Polarization Wireless System for Multipath Signal Separation

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Solution Overview

Problem

Existing wireless communication systems face reliability issues due to noise and interference caused by multiple reflection and scattering of electromagnetic waves between transmitter and receiver, which cannot be effectively handled by existing techniques that use polarized waves.

Innovation Solution

A wireless communication system that employs a transmitter with rotational polarization and a receiver using strongly correlated codes to establish synchronization, calculate correlation values, and select specific reception polarized waves to separate signals from different propagation paths, thereby enhancing reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If wireless communication is used to reduce introduction and maintenance costs, then cost efficiency is improved, but data reliability deteriorates due to external noise and disturbance waves

Engineering Contradiction:

Improveintroduction and maintenance costVSAvoiddata reliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent segments the received signal into multiple propagation path components based on polarization angle differences. Each path component is processed separately through correlation calculation, allowing individual noise reduction while preserving the overall signal integrity and reliability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent converts the harmful effect of multiple reflection paths and noise into a benefit by using polarization angle characteristics to identify and separate useful signal paths from noisy ones, transforming the complex electromagnetic environment into a source of reliable communication

Inventive Principle:

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

2Adaptability or versatility

If signals are transmitted through multiple propagation paths to overcome obstacles, then communication coverage is improved, but noise and interference from different paths worsen signal quality

Engineering Contradiction:

Improvecommunication coverageVSAvoidnoise and interference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by processing each propagation path component with specific polarization angle characteristics differently. Each path is evaluated individually through correlation calculation, allowing selective enhancement of high-quality paths and suppression of noisy paths based on their local signal characteristics

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses feedback through correlation calculation between received signals and reference signals to continuously evaluate the quality of each propagation path. This feedback mechanism enables dynamic selection and combination of the best paths, adapting to changing noise and interference conditions

Inventive Principle:

Principle #23Feedback

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach allows for high-reliability wireless communication by reconstructing information from signals transmitted through multiple paths, effectively reducing noise and interference in a radio wave environment with multiple scatterers.

Implementation Method 1

a transmitter that transmits a carrier wave with rotational polarization on which a strongly correlated code is superimposed

Methodology Applied

Scientific EffectRotational polarization: Polarisation

Implementation Method 2

the receiver receives signals in a plurality of different polarized waves, establishes synchronization between the transmitter and the receiver for the plurality of reception polarized waves using correlation values between the received signals and the strongly correlated code

Methodology Applied

Scientific EffectCorrelation:

Implementation Method 3

separates or selects the signals transmitted in different propagation paths using specific reception polarized waves corresponding to the plurality of transmission polarization angles

Methodology Applied

Scientific EffectPolarization separation: Polarisation

Data Source

PatentUS10153824B2Wireless communication system and system using same

Publication Date: 2018.12.11 HITACHI LTD

AI summary

Provided is a wireless communication system that achieves high-reliability communication between a transmitter and a receiver. Specifically, the wireless communication system includes: a transmitter that transmits a carrier wave with rotational polarization on which a strongly correlated code is superimposed; and a receiver that uses the strongly correlated code in the reception polarized wave from the transmitter to establish synchronization between the transmitter and the receiver, wherein the receiver receives signals in a plurality of different polarized waves, establishes synchronization between the transmitter and the receiver for the plurality of reception polarized waves using correlation values between the received signals and the strongly correlated code corresponding to the reception polarized waves, compares the correlation values to a threshold to extract a specific reception polarized wave and a received signal corresponding to the polarized wave, calculates transmission polarization angles from shifts in synchronization timing, and separates or selects the signals transmitted in different propagation paths using specific reception polarized waves corresponding to the plurality of transmission polarization angles and the received signals corresponding to the polarized waves.