FBMC Receiver Frequency Domain Synchronization
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Solution Overview
Problem
Existing FBMC receivers face challenges in synchronizing sampling instants and determining the beginning of packets, especially in noisy conditions and multi-user scenarios, with existing methods being complex and prone to errors.
Innovation Solution
A multi-carrier signal receiver using a frequency domain synchronization method with an error estimation module and interpolating filters to correct sampling instants, allowing for precise synchronization and inter-symbol interference reduction, optionally followed by phase compensation and equalization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time domain synchronization methods are used in FBMC receivers, then packet detection and sampling instant synchronization can be achieved, but the system complexity increases and performance degrades in noisy conditions and multi-user scenarios
Solution Approach 1:
The patent transitions the synchronization process from the time domain to the frequency domain. By performing Fourier transform on the received signal and conducting correlation operations in the frequency domain, the method achieves accurate packet detection and sampling instant synchronization while avoiding the complexity and noise sensitivity of time domain approaches. The frequency domain correlation between received symbols and expected pilot symbols enables robust synchronization even in noisy conditions and multi-user scenarios.
2Measurement precision
If frequency domain synchronization is implemented, then synchronization accuracy improves, but additional processing steps are required
Solution Approach 1:
The patent integrates the synchronization process with the existing frequency domain equalization workflow. The frequency domain correlation operation is performed continuously as part of the signal processing chain, and the obtained synchronization parameters (packet start position and sampling instant) are directly used in subsequent equalization steps. This continuous integration eliminates the need for separate synchronization processing stages, maintaining high precision while avoiding excessive complexity.
3Ease of manufacture
If traditional synchronization methods are used, then implementation is simpler, but inter-symbol interference is not effectively reduced
Solution Approach 1:
The patent employs a feedback mechanism where the frequency domain correlation result is used to determine the optimal packet start position and sampling instant. This feedback information is then applied to adjust the synchronization parameters, which in turn improves the effectiveness of inter-symbol interference reduction. The iterative refinement of synchronization parameters based on correlation metrics ensures that the system achieves both simplicity and effective interference mitigation.
Data Source
AI summary
A filter bank multi-carrier (FBMC) receiver implementing a synchronization in the frequency domain. The receiver includes a synchronization module including an error estimator on the sampling instants and, for each subcarrier, an interpolating filter for reconstructing the samples at the accurate sampling instants. A phase-shifter is provided, for each subcarrier, at the output of the interpolating filter, to make a phase compensation. The phase-shifter can be followed by an equalizer in the frequency domain.