Transmission Device Phase Adaptation for LOS Reception
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Solution Overview
Problem
Conventional spatial multiplexing MIMO systems experience reception quality degradation in Line-Of-Sight (LOS) environments, particularly in broadcast or multicast communications, where the received electric field strength is high but service reception becomes impossible due to signal degradation.
Innovation Solution
A transmission method and device that regularly change the phase of modulated signals over time using a fixed precoding matrix, improving reception quality in LOS environments by adapting the phase changing pattern to the direct wave conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional spatial multiplexing MIMO systems are used, then data transmission capacity is increased, but reception quality degrades in Line-Of-Sight (LOS) environments
Solution Approach 1:
The system dynamically switches between different transmission modes (SISO, MISO, MIMO) and adjusts precoding matrices based on channel conditions, particularly adapting to LOS environments by selecting appropriate phase changing patterns that stabilize direct wave components while maintaining spatial multiplexing benefits
Solution Approach 2:
The invention changes key transmission parameters including phase shifting patterns, precoding matrix selections, and transmission mode configurations to optimize performance in LOS conditions, transforming the static MIMO approach into an adaptive system that modifies parameters based on environmental characteristics
2Reliability
If phase changing is applied to stabilize direct waves, then reception quality in LOS environments improves, but system complexity increases
Solution Approach 1:
The system employs periodic phase changing patterns that repeat at defined intervals, providing stable reception in LOS environments through regular phase adjustments while maintaining predictable system behavior that simplifies receiver design and processing
Solution Approach 2:
Precoding matrices are pre-calculated and stored based on anticipated channel conditions, allowing the system to quickly select appropriate phase correction patterns without real-time complex computations, thereby improving reception quality while limiting the increase in operational complexity
Data Source
AI summary
Provided is a frame configuration usable for both SISO transmission and MISO and/or MIMO transmission. A frame configurator of a transmission device configures a frame by gathering data for SISO and configures a frame by gathering data for MISO and/or MIMO data, thereby to improve the reception performance (detection performance) of a reception device.