FBMC Signal Preprocessing for Truncation Interference
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Solution Overview
Problem
Filter bank multi-carrier modulation (FBMC) systems face challenges due to the 'tail effect' or longer tailing effect of filters, which reduces spectrum efficiency in 5G communication scenarios, especially in IoT applications, as it leads to inter-block interferences and requires truncation methods that distort signals and cause inter-carrier interference.
Innovation Solution
A method is introduced to preprocess symbols affected by truncation in FBMC systems, using pre-coding matrices and truncation techniques such as setting or windowing tailing data to minimize interference and maintain signal quality, thereby maximizing spectrum efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If filter bank multi-carrier modulation is used to improve spectrum efficiency, then data transmission capability is enhanced, but tail effect causes inter-block interference requiring truncation which distorts signals and creates inter-carrier interference
Solution Approach 1:
The patent applies preliminary action by performing pre-coding on symbols that will be affected by truncation before the truncation operation. The pre-coding matrix is designed to anticipate and compensate for the distortion that will occur during truncation, thereby preventing inter-carrier interference rather than correcting it after the fact. This proactive approach maintains signal integrity despite the necessary truncation for reducing tail effect.
Solution Approach 2:
The patent implements preliminary anti-action by introducing a pre-coding matrix that generates counteracting signals before truncation. The pre-coding process creates compensatory components that offset the inter-carrier interference that will be generated by the truncation operation. This anti-action approach directly counterbalances the harmful effects of truncation before they manifest in the transmitted signal.
2Object-generated harmful factors
If truncation is applied to remove tailing data and reduce inter-block interference, then signal quality improves, but determined symbols are affected by the truncation causing performance degradation
Solution Approach 1:
The patent applies preliminary action by pre-coding the determined symbols before truncation. The pre-coding matrix is specifically designed to account for which symbols will be affected by truncation and prepares compensatory information in advance. This allows the system to maintain reliable reception of affected symbols despite the truncation operation removing part of the signal.
Solution Approach 2:
The patent applies local quality by treating different symbols differently based on their vulnerability to truncation. The pre-coding matrix is designed to provide enhanced protection specifically for the determined symbols that will be affected by truncation, while leaving other symbols unchanged. This localized approach optimizes protection where needed without unnecessarily processing the entire signal.
Data Source
AI summary
A method for transmitting signal based on a filter bank multi-carrier (FBMC) modulation, a method for receiving signal based on the FBMC modulation, and a corresponding transmitting device and receiving device are disclosed. The method includes preprocessing determined symbols in a data block, modulating the preprocessed data block with the FBMC modulation, truncating the modulated data block to remove a part or all of tailing data therefrom, and transmitting the truncated modulated data block, from which the part or all of tailing data has been removed, and the determined symbols are affected by the truncating of the modulated data block. The data block includes at least one symbol. The method 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).