Beam Acquisition Using Phase Difference for Precise AoA/AoD Estimation
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Solution Overview
Problem
Current beam acquisition techniques in MIMO systems, particularly in the THz band, face challenges with high overhead and computational complexity due to the need for accurate estimation of Angle of Arrival (AoA) and Angle of Departure (AoD) in sparse channels with high path loss and large bandwidth, where conventional methods like beam sweeping are inefficient and require further refinement.
Innovation Solution
The proposed solution involves efficient beam acquisition techniques using phase difference measurements and temporal resolution to estimate AoA/AoD, leveraging the spatial wideband effect and cross-correlation of signals across multiple RF chains with the same beam pattern, allowing for accurate direction estimation without the need for extensive beam sweeping, and utilizing CSI-RS signaling for phase comparison and beam squint analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional beam sweeping methods are used for beam acquisition in MIMO systems, then beam direction can be identified, but high overhead and computational complexity occur due to the need for accurate AoA/AoD estimation in sparse channels with high path loss and large bandwidth
Solution Approach 1:
The patent segments the beam acquisition process into two distinct stages: coarse beam identification using wide beams, and fine AoA/AoD estimation using phase difference measurements. This segmentation allows the system to first quickly identify candidate beam directions with wide beams, then refine the estimation accuracy through phase comparisons, avoiding the need for exhaustive beam sweeping while achieving high precision
Solution Approach 2:
The patent performs preliminary beam identification using wide beams before conducting precise AoA/AoD estimation. By first establishing coarse beam directions through wide beam sweeping, the system prepares the groundwork for subsequent phase difference measurements, reducing the search space and computational burden of the precision estimation stage
2Measurement precision
If beam sweeping is performed to achieve accurate beam acquisition, then beam direction can be determined, but the process becomes inefficient and requires further refinement
Solution Approach 1:
The patent divides beam acquisition into coarse identification and fine estimation phases, allowing efficient initial beam selection followed by precise angle measurement, thereby improving overall acquisition efficiency without sacrificing accuracy
Solution Approach 2:
The patent replaces the mechanical beam sweeping process with a signal processing-based phase difference measurement approach. Instead of physically sweeping through all possible beam directions, the system uses phase comparisons of signals received at different antenna elements to directly calculate AoA/AoD, significantly improving efficiency
3Productivity
If wide beams are used for initial beam identification, then overhead is reduced, but direction estimation accuracy is insufficient
Solution Approach 1:
The patent segments the measurement process into two precision levels: wide beams provide coarse directional information quickly, while subsequent phase difference measurements provide fine-grained angle accuracy. This multi-level segmentation resolves the contradiction between speed and precision
Solution Approach 2:
The patent introduces phase difference measurements as an intermediary step between wide beam identification and final AoA/AoD determination. The phase difference information acts as a mediator that refines the coarse directional data from wide beams into precise angle estimates without requiring narrow beams
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces computational overhead and improves estimation accuracy, enabling fast and efficient beam acquisition with higher accuracy than conventional methods, even with very narrow beams, by directly estimating AoA/AoD from wide beams and minimizing the impact of phase ambiguity.
Implementation Method 1
efficient beam acquisition techniques using phase difference measurements and temporal resolution to estimate AoA/AoD
Implementation Method 2
leveraging the spatial wideband effect and cross-correlation of signals across multiple RF chains with the same beam pattern
Implementation Method 3
cross-correlation of signals across multiple RF chains with the same beam pattern
Data Source
AI summary
At a first communication device in a wireless communication network, reference signaling is received from a second communication device in two or more beams with a same direction, and one or more values associated with a direction at which the first communication device received the reference signaling from the second communication device are determined. The one or more values are determined based on the received reference signaling. The direction has a higher accuracy than a beam width associated with the received reference signaling. The direction may be or include an angle of arrival or an angle of departure, for example, and in the case of an angle of departure signaling indicative of the one or more values is transmitted by the first communication device, to the second communication device or another component such as network equipment.