Wireless Phase Measurement Using Multi-Location Signal Transmission
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Solution Overview
Problem
Existing technologies struggle to eliminate the impact of transmitter-related factors such as clock offset, hardware delay, and initial phase on phase measurement accuracy in wireless communications, particularly in non-terrestrial networks, leading to uncertainties in phase estimation.
Innovation Solution
The method involves sending signals from different locations by the same transmitting device to calculate the phase difference, assuming that hardware delays remain constant, thereby eliminating these delays and enabling accurate phase measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase measurement is performed using signals from a single transmitting location, then the measurement process is simple, but the measurement precision is degraded due to transmitter-related factors such as clock offset, hardware delay, and initial phase
Solution Approach 1:
The patent segments the phase measurement process by using signals from multiple transmitting locations (first location and second location) instead of a single location. This segmentation allows the system to eliminate transmitter-related phase errors through differential measurement, as each location's signals contribute to calculating the phase difference that cancels out common transmitter impairments like clock offset and hardware delay.
Solution Approach 2:
The patent introduces an intermediary measurement approach where the phase difference between signals from different locations serves as a mediator to eliminate the direct impact of transmitter-related factors. By measuring the phase relationship between multiple signals rather than absolute phase at a single location, the system indirectly compensates for transmitter impairments without requiring direct access to or calibration of the transmitter's internal clock or hardware.
2Measurement precision
If multiple signals are transmitted from different locations to eliminate hardware delays, then the measurement accuracy is improved, but the loss of time increases due to additional signal transmission and processing
Solution Approach 1:
The patent employs periodic transmission of reference signals from different locations, where the signals are transmitted in a structured periodic manner. This allows the receiving device to efficiently process multiple signals by exploiting their periodic structure, reducing the overall time required compared to arbitrary non-periodic transmissions. The periodic action enables systematic elimination of hardware delays while minimizing time loss through regular, predictable signal patterns.
3Reliability
If phase estimation is performed without eliminating transmitter factors, then the process is straightforward, but the reliability of the measurement is degraded due to uncertainty from clock offset, hardware delay, and initial phase
Solution Approach 1:
The patent implements a feedback mechanism where the receiving device calculates phase differences between signals from different locations and uses this information to compensate for transmitter-related uncertainties. The phase difference measurement provides feedback that allows the system to eliminate the impact of clock offset, hardware delay, and initial phase, thereby improving measurement reliability. This feedback-based approach systematically addresses reliability issues without requiring complex transmitter modifications.
Data Source
AI summary
A wireless communications method, a terminal device, and a communications device are provided. One example method includes: transmitting capability information; and receiving a first signal and a second signal that are sent by a first device, wherein the first signal and the second signal are used to determine first phase information that comprises a phase difference between the first signal and the second signal, a location at which the first device transmits the first signal is a first location, a location at which the first device transmits the second signal is a second location, and the first location is different from the second location, wherein the capability information indicates whether the first terminal device supports calculation of the phase difference between the first signal and the second signal.