FBMC Symbol Shifting for Wireless Transmission Efficiency
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Solution Overview
Problem
Current 5G communication systems face challenges in efficiently transmitting filter bank multi-carrier (FBMC) symbols, particularly in reducing transmission time and minimizing power spectrum density (PSD) and channel reception degradation, due to limitations in signal processing and interference management.
Innovation Solution
The method involves selectively shifting sample values of FBMC symbols, both at the transmitting and receiving ends, to overlap symbols on a time axis, allowing for efficient operation of FBMC-based systems while maintaining the feature of well-localization of FBMC filters, thereby reducing transmission time and mitigating interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If FBMC symbols are transmitted using conventional methods without selective shifting, then transmission protocol simplicity is maintained, but transmission time is increased and spectral efficiency is reduced
Solution Approach 1:
The patent applies parameter changes by selectively shifting sample values of FBMC symbols in the time domain. The transmitting end shifts sample values of certain symbols (e.g., even symbols shifted by +L/2 samples, odd symbols shifted by -L/2 samples) to enable overlapping transmission. This parameter modification allows symbols to be transmitted more efficiently in overlapping time slots, reducing overall transmission time while maintaining manageable processing complexity through systematic shift patterns.
2Productivity
If symbols are transmitted in overlapping manner on time axis, then spectral efficiency is improved, but power spectrum density increases causing interference
Solution Approach 1:
The patent applies local quality by performing selective shifting only on specific portions of the FBMC symbols (front end or rear end sample values) rather than uniformly processing all symbols. This localized modification allows certain symbols to be shifted while others remain unshifted or differently shifted, enabling overlapping transmission in specific time regions while maintaining lower PSD in other regions, thus reducing overall interference.
3Loss of time
If sample values are shifted to enable overlapping transmission, then transmission time is reduced, but detection complexity at receiving end increases
Solution Approach 1:
The patent applies preliminary action by pre-defining and signaling the shifting pattern to the receiving end before transmission. The transmitting end determines which symbols will be shifted and by how much, then communicates this information to the receiver. This allows the receiving end to prepare appropriate detection algorithms in advance, compensating for the shifted samples systematically rather than dealing with arbitrary complex patterns, thus reducing detection complexity despite overlapping transmission.
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). The present invention relates to the transmission and the reception of filter bank multi-carrier (FBMC) symbols in a wireless communication system, a method for operating a transmitting end comprises the step of: generating a first symbol in which sample values of a front end are shifted to a rear end; generating a second symbol in which sample values of a rear end are shifted to a front end; and transmitting a plurality of symbols comprising the first symbol and the second symbol on a time axis in an overlapping manner.