FBMC Reference Signal Pattern Design for Multi-Cell Interference
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Solution Overview
Problem
In the 5G communication system, the Filter-Bank Multi-Carrier (FBMC) technology experiences inter-subcarrier interference due to the lack of frequency domain orthogonality, which affects channel estimation and equalization, and existing methods fail to effectively mitigate inter-cell interference in multi-cell environments.
Innovation Solution
A method for determining Reference Signal (RS) pattern building blocks based on per-cell filter information and Resource Block (RB) size, which configures RS patterns to avoid interference regions and determines specific frequency and time shift values, ensuring non-overlapping mapping of cell-specific and antenna port-specific RSs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If FBMC system uses filter banks to modulate signals and negate subcarrier orthogonality, then spectral efficiency is enhanced and spectrum confinement is improved, but inter-subcarrier interference occurs between neighboring cells
Solution Approach 1:
The patent segments the frequency spectrum into distinct resource blocks for different cells, assigning specific frequency ranges to each cell. This segmentation prevents inter-subcarrier interference between neighboring cells while maintaining the spectral efficiency benefits of FBMC by allowing each cell to fully utilize its allocated frequency resources without orthogonal constraints.
Solution Approach 2:
The patent applies local quality by configuring cell-specific filter banks with tailored parameters for each cell. Each cell's reference signals are processed through filters designed for that specific cell's frequency allocation and interference environment, allowing localized optimization of signal quality while maintaining overall system spectral efficiency.
2Reliability
If conventional CRS mapping is used in FBMC system, then reference signals can be transmitted, but inter-cell interference significantly degrades channel estimation performance
Solution Approach 1:
The patent extracts reference signals from the interfering frequency regions by configuring them in protected resource blocks that are specifically allocated and shielded from inter-cell interference. The filter bank processing is designed to confine reference signals within these protected regions, effectively taking them out from the harmful interference environment while maintaining reliable channel estimation.
Solution Approach 2:
The patent introduces cell-specific filter banks as intermediaries between the reference signals and the transmission medium. These filters act as mediators that shape and confine the reference signal spectra, preventing them from interfering with neighboring cells while ensuring they remain detectable for accurate channel estimation in the serving cell.
3Adaptability or versatility
If frequency shift is applied to CRS mapping in multi-cell environment, then per-cell reference signals can be differentiated, but interference regions are not avoided and channel estimation remains inaccurate
Solution Approach 1:
The patent moves the differentiation mechanism from simple frequency shifting to a two-dimensional approach combining frequency block allocation with cell-specific filter bank parameters. Reference signals are differentiated not only by their frequency position but also by their spectral shape and time-domain characteristics imposed by cell-specific filters, providing robust differentiation while avoiding interference regions.
Data Source
AI summary
The present disclosure relates to a 5G or pre-5G communication system for supporting a higher data transfer rate than a 4G communication system such as LTE. The present invention relates to channel estimation and equalization in a cellular environment on the basis of an FBMC transmission and reception technique. A communication method of a base station according to one embodiment of the present invention may comprise the steps of: determining a reference signal (RS) pattern building block of a plurality of cells according to filter information of the plurality of cells; determining an RS pattern of the plurality of cells by using the determined RS pattern building block and the size of a resource block (RB); and transmitting, to a terminal, information about the determined RS pattern. According to one embodiment of the present invention, it is possible to provide a method and an apparatus for mapping a reference signal in a multi-cell environment.