Signal Generation With Dynamic Phase Changes for LOS MIMO

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Solution Overview

Problem

MIMO systems experience reception quality degradation in Line-Of-Sight (LOS) environments, particularly in broadcast or multicast communication, where existing precoding methods fail to address this issue when feedback information is unavailable.

Innovation Solution

A signal generation method involving phase and weighting changes for multiple baseband signals using real numbers and a predetermined matrix, applying phase modification values sequentially from candidates to improve reception quality in LOS environments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If spatial multiplexing MIMO system transmits multiple modulated signals from different antennas simultaneously on common frequency, then transmission speed increases, but reception quality deteriorates in LOS environment with large Rician factor

Engineering Contradiction:

Improvetransmission speedVSAvoidreception quality

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The invention applies dynamic phase changing to the precoded signals transmitted from multiple antennas. By sequentially changing the phase of transmission signals according to a predetermined pattern, the system adapts to LOS propagation conditions while maintaining spatial multiplexing benefits. This dynamic adjustment prevents reception quality deterioration without reducing transmission speed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the phase parameter of transmission signals in a time-varying manner. By modifying the phase of precoded signals before transmission from each antenna, the system resolves the contradiction between maintaining high transmission speed and ensuring reliable reception in LOS environments with large Rician factors.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If conventional precoding method is used in broadcast or multicast communication without feedback information, then system complexity is reduced, but reception quality degradation occurs in LOS environments

Engineering Contradiction:

Improvesystem complexityVSAvoidreception quality

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The invention performs preliminary phase changing on transmission signals before they are transmitted from multiple antennas. By pre-adjusting the phase of precoded signals according to a predetermined changing pattern, the system proactively compensates for LOS propagation effects without requiring complex feedback mechanisms, thus maintaining low system complexity while improving reception quality.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250309965A1Method of signal generation and signal generating device

Publication Date: 2025.10.02 SUN PATENT TRUST

AI summary

A transmission method simultaneously transmitting a first modulated signal and a second modulated signal at a common frequency performs precoding on both signals using a fixed precoding matrix and regularly changes the phase of at least one of the signals, thereby improving received data signal quality for a reception device.