Sampling Clock Tracking for Multi-Carrier Systems
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Solution Overview
Problem
Multi-carrier communication systems face resource-intensive computations when estimating sampling clock offsets, leading to inefficiencies in eliminating inter-carrier interference caused by phase shifts and noise signals.
Innovation Solution
A method involving a sampling clock tracking apparatus that generates data removal symbols, computes phase shifts, and adjusts a control signal to compensate received symbols, reducing the need for accurate clock offset calculations by using a recursion-based approach to progressively adjust the control signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the receiver performs accurate sampling clock offset estimation using pilot symbols and received symbols, then the sampling clock offset can be eliminated, but a large number of computations are required consuming great deal of resources
Solution Approach 1:
The patent extracts and removes the effect of transmitted data from received symbols to create data removal symbols. By eliminating the data component, the system can estimate phase shifts without needing to process the actual transmitted data, significantly reducing computational complexity while maintaining estimation accuracy
Solution Approach 2:
The patent introduces data removal symbols as an intermediary element between received symbols and phase shift estimation. These intermediate symbols contain only the phase and channel information without the data component, serving as a simplified mediator for clock offset estimation
2Reliability
If the receiver processes carrier phase shift, channel estimation value, and noise signal to obtain sampling clock offset, then the sampling clock offset can be compensated, but resources are consumed during computation processes
Solution Approach 1:
The patent extracts only the necessary phase information from received symbols by removing data components. This extraction approach maintains reliability of phase shift estimation while minimizing computational resource consumption by processing only essential information
Solution Approach 2:
The patent performs preliminary data removal to create simplified symbols before phase shift estimation. By preprocessing the symbols to eliminate data components in advance, the system reduces the computational burden of subsequent processing steps while ensuring accurate phase extraction
Data Source
AI summary
An apparatus and a method for tracking a sampling clock of a multi-carrier communication system are disclosed, the apparatus including a data removal module, a phase estimation module, and a sampling clock offset computation module. The data removal module is for generating a plurality of first and second data removal symbols by removing predetermined transmitted data from a plurality of first and second received symbols, respectively. The phase estimation module for generating a first and a second phase shifts according to correlations of the plurality of first and second data removal symbols. The sampling clock offset computation module for generating a control signal utilized to compensate the sampling clock of a plurality of received symbols according to the first and a second phase shifts.