Multiple-Antenna Joint Arrival Estimation Under Bandwidth Limits
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Solution Overview
Problem
Existing methods for time of arrival and angle of arrival estimation in network-based positioning are limited by bandwidth constraints, leading to inaccurate localization, particularly in environments with intense multipath characteristics.
Innovation Solution
A method for joint time of arrival and angle of arrival estimation using multiple antennas, which involves recording time domain samples, generating structured data representations, and applying sparse recovery algorithms and matrix decomposition techniques to enhance measurement diversity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If bandwidth constraints are applied in network-based positioning, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent transitions from single-antenna to multiple-antenna reception, adding a spatial dimension to the measurement system. This dimensional expansion enables the system to capture angle of arrival information while maintaining bandwidth constraints, thereby improving measurement precision without increasing device complexity in the frequency domain.
Solution Approach 2:
The patent segments the received signal into multiple independent measurements across different antenna elements. Each antenna provides a separate measurement of the incoming signal, allowing the system to extract both time of arrival and angle of arrival information through signal processing, thus maintaining precision under bandwidth constraints.
2Device complexity
If single-antenna reception is used, then device complexity is reduced, but measurement precision deteriorates due to insufficient measurement diversity
Solution Approach 1:
The patent adds a spatial dimension by deploying multiple antenna elements in an array configuration. This spatial dimension provides additional measurement diversity through angle of arrival information, significantly improving localization accuracy while maintaining a relatively simple device structure compared to complex signal processing approaches.
Solution Approach 2:
The multiple-antenna system performs multiple functions simultaneously: it captures time of arrival information for distance estimation and angle of arrival information for direction estimation, all within the same bandwidth constraints. This multi-functionality increases measurement diversity without proportionally increasing device complexity.
Data Source
AI summary
A method includes: accessing a ranging signal transmitted from a transmitter and received at a set of antenna elements via a channel; recording time domain samples representing the ranging signal; accessing steering matrices characterized by a time delay grid, a phase angle grid, and distances between antenna elements and a reference antenna element; generating a structured data representation of the time domain samples characterized by the steering matrices; calculating a sparse representation of the channel by executing L1-norm regularization based on the structured data representation; and calculating a time of arrival estimate and an angle of arrival estimate for the ranging signal based on the sparse representation of the channel.