Wireless Clock Phase Adjustment Under Doppler and Multipath Drift
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Solution Overview
Problem
Existing wireless communication systems struggle to maintain synchronization of clock signals when phase changes occur due to fluctuations in wireless transmission path characteristics, such as those caused by Doppler shift or multipath propagation.
Innovation Solution
A wireless communication system with phase adjustment units that detect phase changes in the transmission path and adjust the phase of clock signals to synchronize them, using feedback loops and phase comparators to equalize phase differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless communication is performed without phase adjustment, then device complexity is reduced, but synchronization between clock signals deteriorates when transmission path characteristics fluctuate
Solution Approach 1:
The patent implements a feedback mechanism where the second wireless communication apparatus transmits back a signal containing phase information about the received first signal. The first wireless communication apparatus uses this feedback to detect phase changes and adjust its transmitted clock signal phase accordingly, maintaining synchronization despite transmission path fluctuations.
Solution Approach 2:
The patent changes the phase parameter of the clock signal dynamically based on detected phase changes in the transmission path. The phase adjustment unit modifies the phase of the first clock signal in response to feedback information, allowing the system to adapt to varying transmission conditions and maintain synchronization.
2Reliability
If phase adjustment is implemented to maintain synchronization, then reliability of clock signal synchronization is improved, but pull-in time increases
Solution Approach 1:
The patent performs preliminary phase adjustment by continuously monitoring and adjusting the phase of the first clock signal before synchronization issues arise. The phase adjustment unit operates proactively using feedback information to prevent phase drift, thereby reducing the time needed to achieve and maintain synchronization.
3Stability of the object's composition
If no phase adjustment is performed, then ease of operation is maintained, but communication stability deteriorates in fluctuating environments
Solution Approach 1:
The patent implements self-service through automatic phase adjustment where the system uses its own transmitted signals and received feedback to autonomously detect and correct phase changes. The first wireless communication apparatus automatically adjusts its phase based on the feedback from the second apparatus, maintaining communication stability without external intervention.
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
Enables synchronization of clock signals between apparatuses even in environments with fluctuating wireless transmission path characteristics, reducing pull-in time and maintaining stable communication.
Implementation Method 1
a signal phase can change due to a Doppler shift, which is caused by a change in distance of the wireless transmission path
Implementation Method 2
an influence of multipath propagation, for example. Hereinbelow, such a phase change is referred to as a phase change due to a fluctuation in a wireless transmission path characteristic
Data Source
AI summary
A wireless communication system includes two wireless communication apparatuses. One of the wireless communication apparatuses wirelessly transmits a signal obtained by up-converting a clock signal. The other of the wireless communication apparatuses generates a clock signal based on a received signal and feeds back a signal obtained by up-converting the generated clock signal to the one wireless communication apparatus. The one wireless communication apparatus generates a clock signal based on the fed-back signal, detects a phase change due to a fluctuation in a transmission path characteristic based on the generated clock signal, and adjusts a phase of a reference clock signal based on the detected phase change.