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Efficient Maximum Likelihood Algorithm for Estimating Carrier Frequency Offset of Generalized Frequency Division Multiplexing Systems.
Publication Type: Academic Journal
Source(s): Mathematics (2227-7390). Aug2023, Vol. 11 Issue 15, p3426. 16p.
Abstract: This study presents a computationally efficient maximum likelihood (ML) algorithm for estimating the carrier frequency offset (CFO) of generalized frequency division multiplexing systems. The proposed algorithm uses repetitive subsymbols and virtual ca...
Performance Analysis of QoS-Oriented OFDMA Protocol Based on IEEE 802.11ax for Cognitive Radio Network.
Publication Type: Academic Journal
Source(s): Applied Sciences (2076-3417). Jun2023, Vol. 13 Issue 12, p7163. 18p.
Abstract: To improve the quality of service (QoS) on the internet of medical things, a cognitive radio (CR) protocol based on orthogonal frequency division multiple access (OFDMA) is proposed, named CR-OFDMA. In this protocol, we divide a complete channel into m...
Hybrid FSK–FDM Scheme for Data Rate Enhancement in Dual-Function Radar and Communication.
Publication Type: Academic Journal
Source(s): Sensors (14248220). Jun2023, Vol. 23 Issue 12, p5440. 16p.
Abstract: In this paper, we present a hybrid frequency shift keying and frequency division multiplexing (i.e., FSK–FDM) approach for information embedding in dual-function radar and communication (DFRC) design to achieve an improved communication data rate. Sinc...
Self-Mixing Interferometry Cooperating with Frequency Division Multiplexing for Multiple-Dimensional Displacement Measurement.
Publication Type: Academic Journal
Source(s): Photonics. Jul2023, Vol. 10 Issue 7, p839. 12p.
Abstract: In this study, a multiple-dimensional displacement measurement technology is demonstrated by using self-mixing interferometry (SMI) cooperating with a frequency division multiplexing (FDM) technique. The proposed SMI configuration with a single laser g...
IQM Mitigation Algorithm with Channel Awareness for Upstream SC-FDMA Systems in the Context of Dual-Hop Broadcasts.
Publication Type: Academic Journal
Source(s): Applied Sciences (2076-3417). May2023, Vol. 13 Issue 10, p5838. 22p.
Abstract: A challenging issue for single carrier frequency division multiple access (SC-FDMA) transmissions is in-phase and quadrature-phase mismatch (IQM). There has been prior reporting on this issue; however, it has always been in the setting of single-hop br...
Surface Photonic Crystal Engineering of a Multi-Mode VCSEL for a Bit-Loaded Broadband QAM-OFDM Data Link at 99 Gbit/s.
Publication Type: Academic Journal
Source(s): Photonics. May2023, Vol. 10 Issue 5, p549. 18p.
Abstract: Bit-loaded quadrature amplitude modulation-orthogonal frequency division multiplexing (QAM-OFDM) encoding and photonic-crystal-engineered multi-mode vertical-cavity surface-emitting lasers (MM-VCSELs) transmission performance are analyzed. Two differen...
Optimal Resource Allocation for NOMA Wireless Networks.
Publication Type: Academic Journal
Source(s): Computers, Materials & Continua. 2023, Vol. 74 Issue 2, p3249-3261. 13p.
Abstract: The non-orthogonal multiple access (NOMA) method is a novel multiple access technique that aims to increase spectral efficiency (SE) and accommodate enormous user accesses. Multi-user signals are superimposed and transmitted in the power domain at the ...
Efficient Space–Time Signal Processing Scheme of Frequency Synchronization and Positioning for Sensor Networks.
Publication Type: Academic Journal
Source(s): Sensors (14248220). Feb2023, Vol. 23 Issue 4, p2115. 10p.
Abstract: The orthogonal frequency division multiple access (OFDMA) technique has been widely employed in sensor networks as the data modulation scheme. This study presents a one-dimensional (1D) space–time signal processing scheme for the joint estimation of di...
A Powerful Joint Modulation and STBC Identification Algorithm for Multiuser Uplink SC-FDMA Transmissions.
Publication Type: Academic Journal
Source(s): Applied Sciences (2076-3417). Feb2023, Vol. 13 Issue 3, p1853. 18p.
Abstract: Owing to the rapid development and broad adoption of multiple antenna communication systems over the past few years, space-time block coding (STBC) identification has emerged as a crucial responsibility for smart radios. The majority of previous analys...
Non‐linear modelling and distortion compensation in optical Fast‐orthogonal frequency division multiplexing systems.
Publication Type: Academic Journal
Source(s): IET Optoelectronics (Wiley-Blackwell). Aug2023, Vol. 17 Issue 4, p139-148. 10p.
Abstract: Fast‐OFDM‐based intensity‐modulation and direct‐detection (IM/DD) has been proposed for deployment of cost‐efficient optical access networks, due to its implementation simplicity and high spectral efficiency. In this article, the accuracy of the genera...