Wireless Communication Beam Weight Vector Control for Millimeter-Wave Side Lobe Suppression
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Solution Overview
Problem
In indoor millimeter-wave wireless communication systems, switching between direct and reflected waves to maintain continuous transmission is challenging due to the need for rapid beam direction adjustment, which increases transmission-disconnected time, especially for real-time data like non-compressed images, and is complicated by the adverse effects of antenna array side lobes when determining array weight vectors based on training signal results.
Innovation Solution
A method involving a control system that transmits a training signal while scanning beam patterns, determines primary and secondary directions of departure and arrival, and obtains array weight vectors (AWVs) to selectively use in communication, thereby reducing the time to find and set optimal beam directions and mitigating side lobe effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam direction is adjusted rapidly to switch between direct and reflected waves, then communication continuity is improved, but transmission-disconnected time increases
Solution Approach 1:
The system performs preliminary scanning to identify multiple candidate beam directions (including both direct wave paths and reflected wave paths) before actual communication begins. By pre-positioning beams at potential transmission paths, the system eliminates the need for time-consuming beam switching during communication, thus maintaining continuity without increasing disconnection time.
Solution Approach 2:
The system dynamically adjusts beam directions based on real-time detection of direct wave availability. When the direct wave is blocked, the system transitions to using reflected wave paths that were previously identified during scanning. This dynamic adaptation allows seamless switching between transmission paths without significant interruption.
2Measurement precision
If array weight vector is determined based on training signal results, then beam direction accuracy is improved, but side lobe effects occur
Solution Approach 1:
The system modifies the array weight vector parameters by incorporating constraints that suppress side lobe levels. Instead of simply maximizing main lobe gain based on training signals, the optimization process adjusts multiple parameters simultaneously to achieve both accurate beam pointing and reduced side lobe effects, balancing measurement precision with harmful factor reduction.
Data Source
AI summary
To suppress an adverse effect caused by side lobes of an antenna array when determining an AWV to be used in communication. A first communication device transmits/receives a training signal while scanning a beam pattern, and a second communication device receives/transmits the training signal with a fixed beam pattern. A primary DOD/DOA in the first communication device is determined based on the transmission/reception result of the training signal. Then, second round training is performed. In this point, the first communication device transmits/receives the training signal while scanning a beam pattern in a state where transmission to the primary DOD or reception from the primary DOA is restricted. A secondary DOD/DOA is determined based on the result of the second round training. An AWV corresponding to the primary DOD/DOA and an AWV corresponding to the secondary DOD/DOA are selectively used in communication between the first and second devices.