Wireless Clock Synchronization Using Phase Feedback Control
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Solution Overview
Problem
Existing clock synchronization techniques fail to maintain synchronization between wireless communication apparatuses when phase changes occur due to variations in wireless transmission path characteristics, such as those caused by Doppler shift or multi-path effects.
Innovation Solution
A wireless communication apparatus with a phase adjustment unit that detects phase changes in the transmission path and adjusts the phase of transmitted signals to synchronize with a reference clock signal, using a feedback mechanism to correct for these changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If clock signals are transmitted wirelessly between apparatuses, then communication flexibility and mobility are improved, but phase changes occur due to transmission path variations causing desynchronization
Solution Approach 1:
The transmitting apparatus feeds back control information about the phase of the transmitted signal to the receiving apparatus. The receiving apparatus uses this feedback to adjust its regenerated clock signal phase, creating a closed-loop system that maintains synchronization despite wireless transmission path variations.
Solution Approach 2:
The system dynamically adjusts the phase parameter of the clock signal based on detected phase changes in the wireless transmission path. By changing the phase parameter in response to transmission conditions, the system maintains synchronization between transmitted and regenerated clock signals.
2Reliability
If phase adjustment based on feedback control is implemented, then clock signal synchronization is improved, but system complexity increases due to additional control circuits
Solution Approach 1:
The feedback control mechanism is integrated into the existing wireless communication signal processing chain. The same communication channels transmit both data signals and control information for phase adjustment, allowing the system to perform multiple functions without adding separate dedicated control circuits.
Solution Approach 2:
The receiving apparatus autonomously adjusts its own clock signal phase based on control information received from the transmitting apparatus. Each apparatus serves itself by independently correcting its synchronization based on feedback, eliminating the need for complex centralized control circuits.
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
Ensures synchronization of clock signals between apparatuses even in environments with varying wireless transmission path characteristics, reducing lock-in time and maintaining stable communication.
Implementation Method 1
a phase of a signal changes due to an influence of a Doppler shift or a multi-path caused by change of distance of the wireless transmission path
Implementation Method 2
a phase of a signal changes due to an influence of a Doppler shift or a multi-path caused by change of distance of the wireless transmission path
Data Source
AI summary
A wireless communication apparatus includes a transmission circuit unit, a modulation unit, an encoding unit, a reception circuit unit, a phase adjustment unit, and an antenna unit, wherein the transmission circuit unit transmits a first modulated signal, as a first signal, which is encoded by the encoding unit based on a first clock signal and modulated by the modulation unit, to another wireless communication apparatus via a transmission path from the antenna unit, wherein the reception circuit unit generates a second clock signal based on a second signal received by the antenna unit from the other wireless communication apparatus, and wherein the phase adjustment unit detects a phase change caused by the transmission path based on the second clock signal, and controls a code of the first modulated signal based on the phase change.