Frequency Domain Processing for Multipath Compensation in Wireless Timing
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Solution Overview
Problem
In wireless networks, accurate clock synchronization between devices is hindered by multipath propagation, which causes reflections of packets to arrive at different times and with varying signal strength, degrading the accuracy of time-based functions.
Innovation Solution
A method using frequency domain processing to determine the degree of multipath propagation's effect on a frame, allowing for compensation of time of arrival calculations without the complexity and expense of time domain processing, thereby improving the accuracy of time synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If time domain processing is used to compensate for multipath propagation effects, then measurement precision of time of arrival is improved, but device complexity and processing cost increase
Solution Approach 1:
The patent replaces complex time domain processing operations with simpler frequency domain processing operations. By transforming the signal processing approach from time domain to frequency domain, the system achieves multipath propagation compensation with reduced computational complexity while maintaining measurement precision.
Solution Approach 2:
The patent changes the domain parameter from time domain to frequency domain for signal processing. This parameter change allows the system to process multipath effects more efficiently by working in the frequency domain, where certain operations become computationally simpler while still achieving the desired measurement precision.
2Device complexity
If frequency domain processing is used instead of time domain processing, then device complexity is reduced, but measurement precision may be compromised
Solution Approach 1:
The patent successfully substitutes frequency domain processing for time domain processing while maintaining measurement precision. The frequency domain approach uses spectral analysis and phase information to achieve the same multipath compensation goals with lower computational complexity.
Solution Approach 2:
By changing the processing domain parameter from time to frequency, the system achieves a better balance between complexity and precision. The frequency domain processing preserves the essential timing information through phase relationships while avoiding the computational burden of time domain algorithms.
3Device complexity
If multipath propagation effects are not compensated, then device complexity remains low, but synchronization accuracy and time-based functions are degraded
Solution Approach 1:
The patent implements a simplified frequency domain processing system that provides multipath compensation capability. This substitution enables the system to maintain both processing simplicity and synchronization accuracy by using efficient frequency domain algorithms rather than complex time domain methods.
Solution Approach 2:
The patent changes the processing approach to frequency domain operations, which enables multipath compensation with acceptable complexity. This parameter change allows the system to achieve reliable synchronization accuracy while keeping the processing relatively simple through efficient spectral analysis methods.
Data Source
AI summary
The present disclosure describes methods and apparatuses for fine timing measurement with frequency domain processing. In some aspects, a first device receives a frame that is transmitted by a second device via a wireless medium. A degree to which the frame is affected by multipath propagation in the wireless medium is determined based on frequency power and linear phase of the frame, which can be calculated using frequency domain processing. Based on the degree to which the frame is affected, a time of arrival calculation for the frame can be compensated for effects related to the multipath propagation. By so doing, the effects of multipath propagation can be addressed without time domain processing, which is typically complex and more expensive to implement.