Asynchronous TDD Phase Synchronization Using Level-Fluctuation Selection
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Solution Overview
Problem
In asynchronous TDD systems, achieving phase synchronization is inefficient due to the need for a large number of random signals, leading to high overheads and reduced transmission efficiency.
Innovation Solution
A phase synchronization method and apparatus using N timing phase adjusters, a level calculator, and a selector to perform phase adjustments and determine the signal with minimum level fluctuation, allowing for fast phase synchronization without the need for numerous random signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large quantity of random signals are inserted to enable clock signal synchronization, then phase synchronization accuracy is improved, but transmission overhead increases and transmission efficiency decreases
Solution Approach 1:
The patent changes the parameter of signal type from random signals to pilot signals with known sequences. This allows the receiving end to accurately detect phase information through correlation processing, achieving precise phase synchronization without requiring large quantities of random signals, thus resolving the contradiction between synchronization accuracy and transmission efficiency
Solution Approach 2:
The patent introduces pilot signals as an intermediary carrier for phase information transmission. These pilot signals serve as a mediator between transmitting and receiving ends, enabling accurate phase detection through known sequence correlation, thereby achieving precise synchronization with minimal overhead
2Measurement precision
If a large quantity of random signals are inserted to enable clock signal synchronization, then phase synchronization accuracy is improved, but transmission overhead increases
Solution Approach 1:
The patent changes the signal parameter from random sequences to known pilot sequences, enabling accurate phase detection with minimal signal quantity. The known sequence structure allows correlation-based detection that achieves high precision with far fewer signals, reducing transmission overhead while maintaining synchronization accuracy
Solution Approach 2:
The patent uses pilot signals that are known copies of specific sequences at the receiving end. By comparing the received signal against these known copies through correlation processing, the system can accurately determine phase information without requiring multiple random signals, thus reducing overhead while maintaining precision
Data Source
AI summary
Embodiments of the present invention provide a apparatus. The apparatus includes: N timing phase adjusters, a level calculator, and a first selector, where N is an integer greater than or equal to 2; the timing phase adjuster is configured to perform phase adjustment on a first signal according to a phase adjustment value, to obtain an adjusted first signal, where the first signal is a baseband signal, and the N timing phase adjusters respectively correspond to different phase adjustment values; the level calculator is configured to acquire level fluctuation values, within a preset time, of N adjusted first signals, determine an identifier of an adjusted first signal corresponding to a minimum level fluctuation value, and send the identifier to the first selector; and the first selector is configured to output the adjusted first signal corresponding to the identifier.