MIMO Transmission Device Phase Stabilization for LOS Reception
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Solution Overview
Problem
Conventional MIMO systems experience reception quality degradation in Line-Of-Sight (LOS) environments, particularly in spatial multiplexing MIMO systems, where the Rician factor increases, leading to poor bit error rate performance and service disruption in broadcast or multicast communications.
Innovation Solution
A transmission method and device that employ a precoding matrix with a regular phase changing pattern, combined with iterative decoding techniques, to improve reception quality in LOS environments by adapting the phase of signals over time and using a fixed precoding matrix, enhancing the detection and decoding of MIMO signals.
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 due to increased Rician factor
Solution Approach 1:
The patent applies dynamics by switching between different transmission schemes (SISO, MISO, MIMO) and adjusting precoding matrices based on channel conditions. The system dynamically selects the optimal transmission mode and precoding configuration to adapt to varying LOS and NLOS environments, thereby maintaining both high data transmission rates and reliable reception quality.
Solution Approach 2:
The patent changes parameters by adjusting the precoding matrix selection and transmission scheme configuration based on detected channel states. By modifying parameters such as precoding matrix indices and transmission mode selections, the system optimizes performance for different propagation conditions, resolving the contradiction between transmission speed and reception quality.
2Device complexity
If conventional MIMO detection is used, then system complexity is reduced, but detection accuracy deteriorates in LOS environments
Solution Approach 1:
The patent applies preliminary action by performing channel state detection and selecting appropriate precoding matrices before actual data transmission and detection. The receiver first detects channel information, selects optimal detection parameters, and prepares detection settings in advance, which improves detection accuracy without significantly increasing system complexity during the actual detection process.
Data Source
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AI summary
Provided is a frame configuration usable for both SISO transmission and MISO and/or MIMO transmission. According to the frame configuration, a frame has a preamble, a control symbol, and transmission data symbols. A transmission device includes the designation of a transmission scheme of the transmission data symbols in the control symbol and includes the designation of a transmission scheme of the control symbol in the preamble. This improves the reception performance (detection performance) of a reception device.