Wireless Communication Polarization Alignment Optimization

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Solution Overview

Problem

Conventional MIMO systems face challenges in reducing power losses due to polarization misalignments, especially in high-frequency wireless communication systems where the antenna aperture is small and polarization of user equipment antennas varies relative to base station antennas, making it difficult for user equipment to optimize receive beam polarization.

Innovation Solution

The method involves transmitting configuration data indicating different polarizations for synchronization signals, allowing receiving communication devices to adjust their receiver configurations and request optimal polarizations for future transmissions, thereby optimizing antenna gain and reducing power losses by distinguishing intended from unintended signals based on polarization and directionality information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If multiple antennas with small apertures are used at high transmission frequencies (30 GHz or more), then the received power is increased, but the reception sensitivity becomes significantly dependent on polarization alignment

Engineering Contradiction:

Improvereceived powerVSAvoidreception sensitivity

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The patent implements dynamic polarization adjustment by enabling user equipment to determine the polarization states of received synchronization signals and adjust its receive beam polarization accordingly. This dynamic adaptation allows the system to maintain optimal reception sensitivity despite the small antenna aperture at high frequencies, resolving the contradiction between increased received power and maintained reception sensitivity.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the polarization parameter of the receive beam by determining the polarization state of synchronization signals from different transmit antennas and adjusting the receive beam polarization to match. This parameter adjustment enables the system to overcome the polarization dependency issue inherent in small-aperture high-frequency antennas.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If the user equipment adjusts its receive beam to find the strongest synchronization signal, then the frequency and timing calibration is improved, but the polarization misalignment causes power losses

Engineering Contradiction:

Improvefrequency and timing calibrationVSAvoidpower losses

Core Design Contradiction:

Measurement precisionVSLoss of energy

Solution Approach 1:

The patent implements a feedback mechanism where the user equipment determines the polarization state of received synchronization signals and uses this information to adjust its receive beam polarization. This feedback loop ensures that the receive beam is optimally aligned with the transmit antenna polarization, preventing power losses while maintaining accurate frequency and timing calibration.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent performs preliminary polarization determination during the synchronization signal reception phase, before actual data transmission begins. By determining the polarization states early in the connection establishment process, the system can pre-adjust the receive beam polarization to match the transmit antenna, avoiding power losses during subsequent communications.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If the base station transmits synchronization signals with different polarizations from multiple antennas, then the spatial multiplexing capability is enhanced, but the user equipment faces difficulty in identifying the strongest beam

Engineering Contradiction:

Improvespatial multiplexing capabilityVSAvoidbeam identification

Core Design Contradiction:

ProductivityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent introduces polarization state information as an intermediary that facilitates the user equipment's identification of the strongest beam. By determining and utilizing the polarization states of synchronization signals from different transmit antennas, the user equipment can distinguish between beams and identify the optimal one, even when multiple antennas transmit simultaneously with different polarizations.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11469812B2Operating devices in a wireless communication system

Publication Date: 2022.10.11 SONY GROUP CORP

AI summary

The present application relates to methods for operating a communication de-vice. According to an embodiment, the method comprises transmitting (201) configuration data (300) indicating a first polarization of a first radio frequency signal (301) and a second polarization of a second radio frequency signal (302), transmitting (202) the first radio frequency signal (301) using the first polarization, and transmitting (203) the second radio frequency signal (302) using the second polarization.