FBMC Transmitter Resource Block Conjugation for ISI Reduction
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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 original data and the other transmitting conjugated data, and dynamic resource allocation is adjusted based on channel state information to reduce interference, employing techniques like conjugation and opposite numbering of symbols to eliminate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If FBMC/OQAM modulation is used to achieve better spectral efficiency and time-frequency localization, then spectral efficiency is improved, but intrinsic interference from ISI and ICI causes error floors that degrade link reliability
Solution Approach 1:
The data block is divided into two separate resource blocks (first RB and second RB) with different preprocessing treatments. One block transmits original data while the other transmits conjugated data, allowing the system to segment the transmission to mitigate intrinsic interference effects
Solution Approach 2:
A copy of the data block is created with conjugated symbols and transmitted on the second resource block. This copying approach with conjugation enables the receiver to combine signals and eliminate intrinsic interference through appropriate processing
2Area of stationary object
If data is transmitted on fading channels to achieve communication coverage, then coverage is improved, but intrinsic interference from ISI and ICI becomes more severe leading to error floors
Solution Approach 1:
The invention creates a conjugated copy of the data block and transmits it on a separate resource block. This copying mechanism with conjugation allows the receiver to process multiple versions of the data, canceling out intrinsic interference effects that are exacerbated on fading channels
Solution Approach 2:
The invention changes the parameter of the transmitted signal by applying conjugation to symbols in one of the resource blocks. This parameter transformation (conjugation) modifies the signal characteristics to enable interference cancellation at the receiver, improving reliability on fading channels
Data Source
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.