MIMO Signal Generation with Dynamic Phase Changes for LOS Reception
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Solution Overview
Problem
MIMO systems experience degradation in reception quality in Line-Of-Sight (LOS) environments, particularly in spatial multiplexing systems, which affects broadcast or multicast communication services.
Innovation Solution
A signal generation method and apparatus that applies phase modification and weighting to baseband signals using a predetermined matrix and sequential phase change values to improve reception quality in LOS environments, ensuring high-quality service during broadcast or multicast communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spatial multiplexing MIMO system is used to increase transmission speed, then data transmission rate is improved, but reception quality deteriorates in LOS environments with high Rician factor
Solution Approach 1:
The patent applies dynamic phase changing to the transmitted signals, where the phase modification value varies over time according to a predetermined pattern. This dynamic adjustment prevents the reception quality from deteriorating in LOS environments while maintaining the spatial multiplexing MIMO system's high data transmission rate capability.
Solution Approach 2:
The patent modifies the phase parameter of the transmitted signals by applying sequential phase change values from a set of N candidates. This parameter change approach resolves the reception quality issue in high Rician factor environments without sacrificing the transmission speed advantage of spatial multiplexing MIMO systems.
2Reliability
If phase modification is applied to mitigate reception quality degradation, then reception quality is improved, but signal processing complexity increases
Solution Approach 1:
The patent applies phase modification only to specific signal components rather than the entire signal processing chain. By selectively modifying the phase of transmitted signals using a predetermined matrix and sequential phase change values, the system achieves reception quality improvement while avoiding excessive signal processing complexity.
Data Source
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.