FBMC Receiver Architecture Linear Phase Rotation Compensation
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Solution Overview
Problem
Current receiver architectures for filter-bank multicarrier communication systems, particularly FBMC/OQAM, face challenges in achieving low hardware complexity and robustness against channel impairments and mobility requirements, especially in 5G scenarios, due to the complexity of prototype filters and sensitivity to Doppler shift and CFO.
Innovation Solution
A Filter Bank Multicarrier frequency spread receiver is designed with a linear phase rotation module, discrete Fourier transform, and a Finite Impulse Response digital filter, where the coefficients of the digital filter are truncated to minimize non-zero coefficients, and a frequency shift is introduced to compensate for carrier-frequency offset, reducing hardware complexity and improving Signal to Interference ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the length of the prototype filter is increased to improve time and frequency localization properties, then the robustness against channel impairments and mobility requirements is improved, but the receiver complexity increases considerably
Solution Approach 1:
The patent applies parameter changes by optimizing the prototype filter coefficients and length parameters to achieve the desired robustness with minimal complexity. The filter length L and coefficients are carefully selected to balance performance requirements with receiver complexity constraints in 5G scenarios
Solution Approach 2:
The patent uses partial action by employing a reduced-length prototype filter that provides sufficient robustness against channel impairments and mobility requirements without the excessive complexity of longer filters. The filter length is optimized to provide just enough performance for 5G scenarios
2Device complexity
If the number of non-zero filter coefficients is reduced to minimize hardware complexity, then the device complexity is reduced, but the Signal to Interference ratio may deteriorate
Solution Approach 1:
The patent optimizes the filter coefficients parameters to achieve the desired Signal to Interference ratio with minimal non-zero coefficients. The coefficients are carefully designed to maintain performance while reducing hardware complexity
Solution Approach 2:
The patent extracts only the essential non-zero filter coefficients needed to achieve the target performance, removing unnecessary coefficients while maintaining the required Signal to Interference ratio and robustness against channel impairments
3Adaptability or versatility
If the receiver is designed to support high mobility requirements in 5G scenarios, then the adaptability to varying communication scenarios is improved, but the sensitivity to Doppler shift and carrier-frequency offset increases
Solution Approach 1:
The patent optimizes the prototype filter parameters including length and coefficients to reduce sensitivity to Doppler shift and carrier-frequency offset while maintaining adaptability to high mobility scenarios. The filter design is specifically tailored to perform robustly under varying channel conditions
Solution Approach 2:
The patent applies beforehand cushioning by designing the prototype filter to preemptively compensate for expected Doppler shift and frequency offset effects, reducing their impact before they can degrade performance in high mobility 5G scenarios
Data Source
AI summary
A receiver for Filter Bank Multicarrier frequency spread signals such as FBMC, FBMC/OQAM, OFDM, comprises a linear phase rotation module adapted to introduce a linear phase rotation to a received time domain signal, a discrete Fourier transform and a Finite Impulse response digital filter. The coefficients of the digital filter define a shift of the frequency response of the prototype filter of the receiver, and the coefficients of the digital filter are fixed so as to compensate the linear phase rotation introduced by the filter. The frequency shift introduced may be equal to the reciprocal of a power of two of the modulation sub carrier spacing.