FBMC Receiver Blind Phase Tracking via Simplified Symbols
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Solution Overview
Problem
Existing blind phase tracking methods for FBMC receivers suffer from high symbol error rates due to interference terms and are not easily transposable from OFDM systems, requiring a more robust and simple solution.
Innovation Solution
A blind phase tracking method using simplified symbols, where the real and imaginary parts are encoded on a single bit, and a phase estimation module that calculates the phase shift by performing Hermitian products and averaging phase correction factors, supplemented by optional supervised estimation from pilot symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing blind phase tracking methods are used in FBMC receivers, then phase tracking is performed, but symbol error rates are high due to interference terms
Solution Approach 1:
The received signal is segmented into multiple blocks, and phase estimation is performed independently on each block using simplified symbols. This segmentation allows the system to avoid interference terms that affect traditional methods by processing smaller, manageable segments with reduced complexity operations.
Solution Approach 2:
The invention extracts only the essential phase information from the received signal by using simplified symbols (real part and imaginary part encoded on a single bit). This extraction process removes interfering components while preserving the necessary phase data for accurate tracking.
2Adaptability or versatility
If traditional blind phase tracking methods are used, then phase estimation is performed, but the complexity is high and the method is not easily transposable from OFDM systems
Solution Approach 1:
The invention applies local quality by using simplified symbols specifically designed for FBMC systems, where only the real and imaginary parts are encoded on a single bit. This localized simplification reduces complexity while maintaining adaptability to FBMC's specific requirements, making the method easily transposable from OFDM systems.
Solution Approach 2:
The invention changes the parameter representation by encoding the real and imaginary parts on a single bit rather than using traditional multi-bit representations. This parameter change simplifies the phase estimation process and reduces computational complexity while maintaining versatility across different FBMC configurations.
3Measurement precision
If simplified symbols with single-bit encoding are used, then complexity is reduced and accuracy improves, but traditional multi-bit representations are abandoned
Solution Approach 1:
The invention uses simplified symbols that can be viewed as disposable representations - each symbol is processed, used for phase estimation, and then discarded. The single-bit encoding creates a simplified, low-cost representation that is sufficient for its purpose of phase tracking without requiring complex multi-bit representations.
Data Source
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AI summary
The invention relates to a blind phase-tracking method for a FBMC receiver. The frequency components of the received signal, after baseband translation (210) and filtering by an analysis filter bank (220), are processed by a phase estimation module (260). This module estimates, for each subcarrier, the data it carries and, where applicable, the interference generated by other data. A simplified symbol is then constructed using the sign of the data thus estimated and, where applicable, the sign of the interference thus estimated. The phase estimation module (360) determines the phase from the frequency components and the simplified symbols. Phase correction is achieved by multiplication by a phase correction factor (245, 233).