Wireless Distance Measurement Using Phase Difference
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately measuring distance between entities, particularly in scenarios where synchronization between transmitter and receiver is not secured, such as in vehicle-to-everything (V2X) communication, which requires precise distance measurement for reliable operations.
Innovation Solution
A method that measures distance by processing phase information of radio signals transmitted between entities using multiple frequencies, allowing for accurate distance calculation even without time synchronization, utilizing techniques like FFT operations to determine the difference in processing and reception times of these signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If time synchronization is implemented between transmitter and receiver, then distance measurement accuracy is improved, but system complexity and cost increase
Solution Approach 1:
The patent extracts the time synchronization requirement from the distance measurement process by using phase difference measurement at a single receiver. Instead of requiring synchronized clocks between transmitter and receiver, the method measures the phase difference between signals received from multiple transmitters, thereby eliminating the need for complex inter-device synchronization while maintaining measurement accuracy.
Solution Approach 2:
The patent introduces phase difference measurement as an intermediary approach. Rather than directly measuring time of flight which requires synchronization, the method uses phase difference at the receiver as an intermediate parameter that can be converted to distance information without requiring the transmitter and receiver to be time-synchronized.
2Ease of operation
If phase difference measurement method is used, then distance measurement can be performed without time synchronization, but measurement precision may be reduced
Solution Approach 1:
The patent transitions from one-dimensional time-based measurement (which requires synchronization) to two-dimensional phase-space measurement. By measuring phase differences across multiple frequencies and combining them mathematically, the system achieves accurate distance measurement without time synchronization, effectively adding a dimensional approach to the measurement problem.
Solution Approach 2:
The patent changes the measurement parameter from time of flight to phase difference. By measuring phase differences at multiple frequencies and using mathematical combination, the system achieves distance measurement accuracy comparable to time-synchronized methods while operating without synchronization. The parameter transformation allows the system to bypass the synchronization requirement while maintaining precision.
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 provides improved accuracy in distance measurement, enabling reliable communication in V2X systems and other applications requiring precise distance determination, without the need for time synchronization between transmitter and receiver.
Implementation Method 1
A method and apparatus for transmitting control information in a wireless communication system supporting vehicletier aggregation (CA)
Implementation Method 2
utilizing techniques like FFT operations to determine the difference in processing and reception times of these signals
Implementation Method 3
measuring a phase difference between the received signal and a reference signal, wherein the reference signal is generated based on a symbol timing of the received signal
Data Source
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AI summary
According to one embodiment, a distance technique between a transmitter and a receiver for processing a signal in symbol units is presented. According to the embodiment, the transmitter transmits a transmission signal to the receiver through preset first and second frequencies. Then, the transmitter receives, from the receiver, a reception signal corresponding to the transmission signal. The reception signal includes a first reception component corresponding to the first frequency and a second reception component corresponding to the second frequency. The phase difference set by the receiver is applied between the phase of the first reception component and the phase of the second reception component. The phase difference is set on the basis of the difference between a reception time at which the transmission signal is received by the receiver and a processing time at which the transmission signal is processed in the receiver.