FBMC Resource Block Mapping for Fading-Channel Interference
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Solution Overview
Problem
The FBMC/OQAM system experiences link reliability issues due to intrinsic interference from ISI and ICI on fading channels, particularly in high-speed mobility and frequency selective environments, leading to error floors that degrade system performance.
Innovation Solution
A method is introduced where the original data block is mapped to two resource blocks with shared time resources and non-overlapping frequency resources, with one block transmitting the original data and the other block transmitting the conjugate data, and dynamic resource allocation is adjusted based on channel state information to reduce ISI and ICI, enhancing the system's resistance to fading channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If FBMC/OQAM modulation is used to improve spectral efficiency and reduce out-of-band leakage, then spectrum utilization is improved, but intrinsic interference (ISI and ICI) on fading channels causes link reliability degradation
Solution Approach 1:
The transmitter divides the original data block into multiple segments, applying different preprocessing operations (conjugation, sign inversion) to different segments. This segmentation allows the system to combat intrinsic interference through diversity while maintaining the spectral efficiency benefits of FBMC/OQAM modulation.
Solution Approach 2:
The system dynamically changes signal parameters by applying different preprocessing operations (conjugation, sign inversion) to data segments based on channel conditions. This parameter transformation creates diversity that helps overcome the intrinsic interference problem while preserving the modulation scheme's spectral efficiency advantages.
2Productivity
If data is transmitted on fading channels to achieve communication, then data transmission is enabled, but intrinsic interference causes error floors that limit performance improvement
Solution Approach 1:
The system converts the harmful intrinsic interference into a beneficial effect by applying preprocessing operations that create predictable interference patterns. These patterns can be compensated at the receiver, transforming the previously harmful interference into a manageable component that actually helps with synchronization and channel estimation.
Solution Approach 2:
The transmitter creates a composite signal structure by combining the original data block with preprocessed versions (conjugated and sign-inverted segments). This composite transmission provides multiple copies of the information with different interference characteristics, allowing the receiver to combine them for improved reliability while maintaining data transmission capability.
3Reliability
If conventional OFDM with Cyclic Prefix is used to resist ISI, then interference resistance is improved, but spectral efficiency is greatly reduced due to CP overhead
Solution Approach 1:
The invention extracts and removes the Cyclic Prefix from the FBMC/OQAM signal structure. By eliminating the CP overhead that plagues OFDM systems, the system achieves spectral efficiency comparable to or better than OFDM while maintaining interference resistance through the alternative preprocessing and transmission diversity mechanisms.
Data Source
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AI summary
A Filter Bank Multicarrier (FBMC) modulation-based signal transmitting method includes mapping, by a transmitter, an original Data Block (DB) with at least one symbol to a first Resource Block (RB), preprocessing the original DB, and mapping the preprocessed original DB to a second RB, modulating, by the transmitter, data of the first RB and the second RB by using a FBMC modulation, and, transmitting, by the transmitter, the data modulated. A transmitter, comprising a mapping module, a modulating module and a transmitting module, wherein the mapping module is to map an original DB with at least one symbol to a first resource block (RB), preprocess the original DB, and map the preprocessed original DB to a second RB, the modulating module is to modulate data of the first RB and the second RB, by using FBMC modulation, and, the transmitting module is to transmit the data modulated.