Data-Driven Beam Tracking for Mobile mmWave Systems
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Solution Overview
Problem
Current mmWave communication systems face challenges in beam alignment due to mobility, requiring time-consuming exhaustive searches and relying on channel information for beamforming, which is unsuitable for mobile environments and results in poor performance at low SNR.
Innovation Solution
A data-driven beam tracking method using a dynamically linearized representation of a time-varying pseudo-gradient parameter estimation process, relying solely on real-time I/O measurement data to adapt the array weight vector and reduce alignment time, without requiring explicit system structure or dynamic information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional exhaustive searching is used to find optimal beam direction, then beam alignment accuracy is improved, but alignment time increases to several seconds which is unsuitable for mobile systems
Solution Approach 1:
The patent applies preliminary action by performing channel estimation and obtaining channel information before the beam tracking process. This allows the system to have advance knowledge of the channel characteristics, enabling faster beam tracking without exhaustive searching. The channel information is prepared in advance and used to guide the beam tracking algorithm, reducing the time needed for beam alignment in mobile scenarios.
Solution Approach 2:
The patent implements feedback by using the obtained channel information to continuously update and adjust the beam tracking process. The system monitors the channel state and uses this feedback to adaptively adjust beam directions and weights, eliminating the need for time-consuming exhaustive searches while maintaining accurate beam alignment in dynamic mobile environments.
2Loss of time
If hierarchical codebook searching is used to accelerate beam tracking, then alignment time is reduced, but adjacent signal directions may conflict and cause wrong direction selection
Solution Approach 1:
The patent uses feedback from channel estimation results to guide the hierarchical codebook searching process. By incorporating channel information obtained in advance, the system can identify and avoid conflicting signal directions during the hierarchical search, preventing wrong beam selections while maintaining fast alignment time. The feedback mechanism allows the system to adaptively adjust the search process based on actual channel conditions.
Solution Approach 2:
The patent applies preliminary action by performing channel estimation before hierarchical codebook searching. This preliminary channel information is used to pre-identify potential conflicting directions and adjust the search strategy accordingly, allowing the hierarchical method to maintain both speed and reliability by avoiding known problematic directions from the outset.
3Measurement precision
If precoding algorithm is developed through basis pursuit technology, then beamforming accuracy is improved, but channel information must be obtained first requiring reliable channel estimation which performs poorly at low SNR
Solution Approach 1:
The patent merges channel estimation with beam tracking into a joint process. Instead of performing channel estimation separately before beam tracking, the system combines both operations, allowing the beam tracking process itself to contribute to channel estimation accuracy. This joint approach enables the system to achieve reliable beamforming accuracy even at low SNR by mutually reinforcing the channel estimation and beam tracking functions.
Data Source
AI summary
Based on real-time measurement data, disclosed is a data-driven beam tracking solution for a mobile Millimeter Wave (mmWave) communication system. A disclosed data driving method is based on a dynamically linearized representation of a time-varying pseudo-gradient parameter estimation process. In the disclosure, an effective codebook design method is introduced, so that beam tracking may further be accelerated with a low overhead by beam rotation.