Log in

Relevant bibliographies by topics / Orthogonal Frequency Division Multiplexing (OFDMA) / Journal articles

To see the other types of publications on this topic, follow the link: Orthogonal Frequency Division Multiplexing (OFDMA).

Journal articles on the topic 'Orthogonal Frequency Division Multiplexing (OFDMA)'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 September 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Orthogonal Frequency Division Multiplexing (OFDMA).'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Al-Rawi, M. "Performance analysis of OFDMA and SC-FDMA." International Review of Applied Sciences and Engineering 8, no. 2 (2017): 113–16. http://dx.doi.org/10.1556/1848.2017.8.2.2.

Full text

Abstract:

The main challenge in any high-speed digital communication system is how to maximize the data rate with minimizing the bit error rate. Several techniques have been developed to achieve this point. Some of these techniques are orthogonal frequency division multiplexing (OFDM), single-carrier frequency domain equalization (SC-FDE), orthogonal frequency division multiple access (OFDMA), and single-carrier frequency division multiple access (SC-FDMA). These four techniques are described briefly in this paper. Also, the paper measures the performances of OFDMA and SC-FDMA systems over international

APA, Harvard, Vancouver, ISO, and other styles

2

Ahmed, Mohamed H., Octavia A. Dobre, and Rabie K. Almatarneh. "Analytical Evaluation of the Performance of Proportional Fair Scheduling in OFDMA-Based Wireless Systems." Journal of Electrical and Computer Engineering 2012 (2012): 1–12. http://dx.doi.org/10.1155/2012/680318.

Full text

Abstract:

This paper provides an analytical evaluation of the performance of proportional fair (PF) scheduling in Orthogonal Frequency-Division Multiple Access (OFDMA) wireless systems. OFDMA represents a promising multiple access scheme for transmission over wireless channels, as it combines the orthogonal frequency division multiplexing (OFDM) modulation and subcarrier allocation. On the other hand, the PF scheduling is an efficient resource allocation scheme with good fairness characteristics. Consequently, OFDMA with PF scheduling represents an attractive solution to deliver high data rate services

APA, Harvard, Vancouver, ISO, and other styles

3

L. N. Balai, Girraj Kumar Jangid, Ashish Kumar Sharma,. "Investigations on PAPR and SER Performance Analysis of OFDMA and SCFDMA under Different Channels." International Journal on Recent Technologies in Mechanical and Electrical Engineering 9, no. 5 (2022): 28–35. http://dx.doi.org/10.17762/ijrmee.v9i5.371.

Full text

Abstract:

Code Division Multiple Access (CDMA) and Orthogonal Frequency Division Multiplexing are two multicarrier regulatory systems that have improved due to the growing demand in quick communication (OFDM). A frequency division multiplexing (FDM) plot called orthogonal frequency division multiplexing is utilized as a sophisticated multi carrier regulation approach. Due to its excellent spectrum efficiency and low data rate, the single carrier multiple access system (SC-FDMA) is a unique radio transmission technique that is now employed in long-term evolution (LTE) technology for uplink. When co

APA, Harvard, Vancouver, ISO, and other styles

4

L. N. Balai, Girraj Kumar Jangid, Ashish Kumar Sharma,. "Investigations on PAPR and SER Performance Analysis of OFDMA and SCFDMA under Different Channels." International Journal on Recent Technologies in Mechanical and Electrical Engineering 9, no. 3 (2022): 28–35. http://dx.doi.org/10.17762/ijrmee.v9i3.371.

Full text

Abstract:

Code Division Multiple Access (CDMA) and Orthogonal Frequency Division Multiplexing are two multicarrier regulatory systems that have improved due to the growing demand in quick communication (OFDM). A frequency division multiplexing (FDM) plot called orthogonal frequency division multiplexing is utilized as a sophisticated multi carrier regulation approach. Due to its excellent spectrum efficiency and low data rate, the single carrier multiple access system (SC-FDMA) is a unique radio transmission technique that is now employed in long-term evolution (LTE) technology for uplink. When co

APA, Harvard, Vancouver, ISO, and other styles

5

Mahender, Kommabatla, Tipparti Anil Kumar, and K. S Ramesh. "PAPR Analysis of Fifth Generation Multiple Access Waveforms for Advanced Wireless Communication." International Journal of Engineering & Technology 7, no. 3.34 (2018): 487. http://dx.doi.org/10.14419/ijet.v7i3.34.19364.

Full text

Abstract:

This paper describes the aspects of multiple access for emerging (5G) Wireless Communication Systems. Orthogonal Frequency Division Multiplexing (OFDM) is best suited for fourth generation (4G) but it suffers from the problem of high Peak to Average Power Ratio (PAPR) & Side band leakage. Single carrier frequency division multiple access (SC-FDMA) has worked like an alternative to OFDMA only in the uplink process and PAPR was reduced. OFDM based 4G network is not capable of supporting diverse applications and these applications can be implemented by 5G. High traffic requirements of 5G can

APA, Harvard, Vancouver, ISO, and other styles

6

Junejo, Naveed Ur Rehman, Mariyam Sattar, Saifullah Adnan, et al. "A Survey on Physical Layer Techniques and Challenges in Underwater Communication Systems." Journal of Marine Science and Engineering 11, no. 4 (2023): 885. http://dx.doi.org/10.3390/jmse11040885.

Full text

Abstract:

In the past decades, researchers/scientists have paid attention to the physical layer of underwater communications (UWCs) due to a variety of scientific, military, and civil tasks completed beneath water. This includes numerous activities critical for communication, such as survey and monitoring of oceans, rescue, and response to disasters under the sea. Till the end of the last decade, many review articles addressing the history and survey of UWC have been published which were mostly focused on underwater sensor networks (UWSN), routing protocols, and underwater optical communication (UWOC).

APA, Harvard, Vancouver, ISO, and other styles

7

Richard, E. Alwin. "Performance Analysis of OFDMA vs. NOMA in Cognitive Radio Network." International Journal for Research in Applied Science and Engineering Technology 9, no. VI (2021): 2483–88. http://dx.doi.org/10.22214/ijraset.2021.34751.

Full text

Abstract:

Recent advancements in communication systems have resulted in a new class of multiple access schemes known as non-orthogonal multiple access (NOMA), the primary goal of which is to increase spectrum efficiency by overlapping data from different users in a single time-frequency resource used by the physical layer. NOMA receivers can resolve interference between data symbols from various users, hence increasing throughput. Initially, the combination of SCMA and orthogonal frequency division multiplexing (OFDM) is addressed, establishing a baseline for the overall SER performance of the multiple

APA, Harvard, Vancouver, ISO, and other styles

8

Uppal, Sabhyata, Sanjay Sharma, and Hardeep Singh. "Analytical Investigation on Papr Reduction in OFDM Systems Using Golay Codes." Journal of Electrical Engineering 65, no. 5 (2014): 289–93. http://dx.doi.org/10.2478/jee-2014-0046.

Full text

Abstract:

Abstract Orthogonal frequency division multiplexing (OFDM) is a common technique in multi carrier communications. One of the major issues in developing OFDM is the high peak to average power ratio (PAPR). Golay sequences have been introduced to construct 16-QAM and 256-QAM (quadrature amplitude modulation) code for the orthogonal frequency division multiplexing (OFDM), reducing the peak-to-average power ratio. In this paper we have considered the use of coding to reduce the peakto- average power ratio (PAPR) for orthogonal frequency division multiplexing (OFDM) systems. By using QPSK Golay seq

APA, Harvard, Vancouver, ISO, and other styles

9

Lowery, Arthur James. "Spectrally efficient optical orthogonal frequency division multiplexing." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 378, no. 2169 (2020): 20190180. http://dx.doi.org/10.1098/rsta.2019.0180.

Full text

Abstract:

This paper charts the development of spectrally efficient forms of optical orthogonal frequency division multiplexing (OFDM) that are suited for intensity-modulated direct detection systems, such as wireless optical communications. The journey begins with systems using a DC-bias to ensure that no parts of the signal that modulates the optical source are negative in value, as negative optical intensity is unphysical. As the DC-part of the optical signal carries no information, it is wasteful in energy; thus asymmetrically clipped optical OFDM was developed, removing any negative-going peaks bel

APA, Harvard, Vancouver, ISO, and other styles

10

Yang, Jieying. "Orthogonal frequency division multiplexing technology based on MATLAB." Applied and Computational Engineering 6, no. 1 (2023): 351–58. http://dx.doi.org/10.54254/2755-2721/6/20230807.

Full text

Abstract:

The subcarriers of an orthogonal frequency division multiplexing (OFDM) system are not identical in the time domain, and their spectra also overlap. As a result, the spectrum is being used effectively. Its effective use of frequency resources and capacity to combat channel fading have made it the de facto technical standard. In wireless communication, numerous pathways in the channel can lead to interference between symbols, known as inter-symbol interference (ISI). This research supplements OFDM systems with some safeguards to eliminate inter-symbol interference. Most traditionally, OFDM symb

APA, Harvard, Vancouver, ISO, and other styles

11

Sun, Zeng You, and Fan Ming Zeng. "Optimization and Simulation of OFDM System Based on Orthogonal Wavelet." Applied Mechanics and Materials 548-549 (April 2014): 1221–26. http://dx.doi.org/10.4028/www.scientific.net/amm.548-549.1221.

Full text

Abstract:

In order to reduce the Orthogonal Frequency division Multiplexing (OFDM) Inter-Carrier Interference (ICI), Put forward a kind of modulation method that based on the orthogonal frequency division multiplexing of orthogonal wavelet, Using orthogonal wavelet instead of discrete Fourier transform, optimize the design for OFDM systems, on the premise of without protection interval to reduce the system interference, using MATLAB to simulate the OFDM system, results show that the optimization of the OFDM can reduce the power of the ICI and Inter-symbol Interference (ISI) and improve the comprehensive

APA, Harvard, Vancouver, ISO, and other styles

12

Solyman, Ahmad AA, Hani Attar, Mohammad R. Khosravi, and Baki Koyuncu. "MIMO-OFDM/OCDM low-complexity equalization under a doubly dispersive channel in wireless sensor networks." International Journal of Distributed Sensor Networks 16, no. 6 (2020): 155014772091295. http://dx.doi.org/10.1177/1550147720912950.

Full text

Abstract:

In this article, three novel systems for wireless sensor networks based on Alamouti decoding were investigated and then compared, which are Alamouti space–time block coding multiple-input single-output/multiple-input multiple-output multicarrier modulation (MCM) system, extended orthogonal space–time block coding multiple-input single-output MCM system, and multiple-input multiple-output system. Moreover, the proposed work is applied over multiple-input multiple-output systems rather than the conventional single-antenna orthogonal chirp division multiplexing systems, based on the discrete frac

APA, Harvard, Vancouver, ISO, and other styles

13

Girinath, N. "A Novel Reconfigurable Orthogonal Frequency Division Multiplexing Transceiver." Journal of Computational and Theoretical Nanoscience 16, no. 2 (2019): 430–35. http://dx.doi.org/10.1166/jctn.2019.7745.

Full text

Abstract:

As the world moves toward 3G/4G there is a need for high data rate and relatively wide bandwidths. OFDM (Orthogonal Frequency Division Multiplexing) a form of multicarrier modulation technique is widely used to achieve high speed efficient data transmission at the rate of several Mbps. It is used in Wi-Fi standards like 802.11a, 802.11n, 802.11ac, broadcast standards like Digital Video Broadcast (DVB) and cellular telecommunications standard LTE. The main advantage of OFDM compared to single carrier modulation is their robustness to channel fading in wireless environment, high baud rates and l

APA, Harvard, Vancouver, ISO, and other styles

14

Koti, Jayasudha, and Braj Kishore Mishra. "BER Performance Comparison of DCO-OFDM and Convolutional Coded DCO-OFDM in IM/DD Systems." International Journal of Electronics, Communications, and Measurement Engineering 8, no. 2 (2019): 26–39. http://dx.doi.org/10.4018/ijecme.2019070102.

Full text

Abstract:

Optical wireless communication (OWC) is an alternative technology to meet the demands of the exponentially-growing high data rate applications run by broadband users. The implementation of single carrier modulation techniques in OWC is an age old technology, but for the last few years research is focused towards the multicarrier modulation techniques in OWC. In OWC, information is carried using intensity modulation and retrieved using direct detection. To perform intensity modulation, the baseband signal should be a unipolar signal. To obtain a unipolar signal, various techniques such as DC-bi

APA, Harvard, Vancouver, ISO, and other styles

15

Yang, Xianzhen, Siyuan Yan, Xiao Li, and Fu Li. "A Unified Spectrum Formulation for OFDM, FBMC, and F-OFDM." Electronics 9, no. 8 (2020): 1285. http://dx.doi.org/10.3390/electronics9081285.

Full text

Abstract:

Although orthogonal frequency division multiplexing (OFDM) has been standardized for 5G, filter bank multi-carrier (FBMC) and filtered orthogonal frequency division multiplexing (F-OFDM) remain competitive as candidates for future generations of wireless technologies beyond 5G, due to their reduced spectrum leakage and thus enhanced spectrum efficiency. In this article, we developed a unified spectrum expression for OFDM, FBMC, and F-OFDM, which provides comparative insights into those techniques. A representative sideband quantification is included at the end of this article.

APA, Harvard, Vancouver, ISO, and other styles

16

Praveen Kumar Malik and M P Tripathi. "OFDM: A Mathematical Review." Journal on Today's Ideas - Tomorrow's Technologies 5, no. 2 (2017): 97–111. http://dx.doi.org/10.15415/jotitt.2017.52006.

Full text

Abstract:

Mathematical review of the Orthogonal Frequency Division Multiplexing is demonstrated in terms of Inter symbol interference, Multi carrier modulated system and cyclic prefix. Modeling of the mathematical equation of the Orthogonal Frequency Division Multiplexing, Inverse fast Fourier transform and fast Fourier transform is explained with the suitable example using MATLAB. Bit error rate performance of OFDM is also presented with the help of statistical computation.

APA, Harvard, Vancouver, ISO, and other styles

17

Sahrab, Ammar A., and Alaa Doohee Yaseen. "Filtered orthogonal frequency division multiplexing for improved 5G systems." Bulletin of Electrical Engineering and Informatics 10, no. 4 (2021): 2079–87. http://dx.doi.org/10.11591/eei.v10i4.3119.

Full text

Abstract:

Wireless communications became an integrated part of the human life. Fifth generation (5G) is the modern communication which provides enhanced mobile broadband (eMBB), ultra reliable low latency communications (URLLC), and massive machine type communication (mMTC). Thus, 5G have to provide coverage to multi-numerology devices, therefore, modulation and access schemes are suggested in the literature such as cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) and filtered OFDM (f-OFDM). CP-OFDM suffers from the high out of band emission which limited the multi-numerology applicati

APA, Harvard, Vancouver, ISO, and other styles

18

Li, Chen Wu, Jian Zhang, Qin Xie, and Xiao Hong Zhang. "Carrier Modulation Technology Based on Orthogonal Frequency Division Multiplexing." Advanced Materials Research 774-776 (September 2013): 1671–76. http://dx.doi.org/10.4028/www.scientific.net/amr.774-776.1671.

Full text

Abstract:

This paper first analyzes the transmission characteristics of low-voltage power line channels with the focus on the study of carrier modulation technology regarding the power line communication part, then proposes the orthogonal frequency division multiplexing technology that serves for the digital communication of family network power line communication gateways, analyzes the OFDM system principle, actulizes OFDM modulation and demodulation through discrete Fourier transform (DFT) and inverse discrete Fourier transform (IDFT), and build the OFDM simulation model. Finally, a specific plan of u

APA, Harvard, Vancouver, ISO, and other styles

19

Sung, Jiun-Yu, Chien-Hung Yeh, Chi-Wai Chow, Wan-Feng Lin, and Yang Liu. "Orthogonal frequency-division multiplexing access (OFDMA) based wireless visible light communication (VLC) system." Optics Communications 355 (November 2015): 261–68. http://dx.doi.org/10.1016/j.optcom.2015.06.070.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Yonis, Aws Zuheer, and Khalid Khalil Mohammed. "Investigation of pattern division multiple access technique in wireless communication networks." Indonesian Journal of Electrical Engineering and Computer Science 26, no. 1 (2022): 296. http://dx.doi.org/10.11591/ijeecs.v26.i1.pp296-303.

Full text

Abstract:

Recently, <span>pattern division multiple access (PDMA) is a non-orthogonal multiple access system that is now being developed in next-generation telecoms to address the requirement for mass connectivity. The core premise of non-orthogonal multiple access is to simultaneously serve multiple users with varying power levels across the same spectrum resources such as time, frequency, code, as well as space with minimal inter-user interference. A simulation analysis of significant technology enhancements focusing on PDMA aims to describe the benefits of the two plans now being examined by th

APA, Harvard, Vancouver, ISO, and other styles

21

Sun, Enchang, Kechu Yi, Bin Tian, and Dongying Zhang. "Quasi-Orthogonal Time Division Multiplexing and Its Performances in Rayleigh Fading Channels." ISRN Communications and Networking 2012 (March 27, 2012): 1–5. http://dx.doi.org/10.5402/2012/295424.

Full text

Abstract:

This paper proposes an efficient transmission scheme, Quasi-Orthogonal Time Division Multiplexing (QOTDM), which employs the shift orthogonal property of the pulse function with raised-cosine spectral shape, and the signal waveforms are quasi-orthogonal in time domain. Comparing to orthogonal frequency division multiplexing (OFDM), QOTDM is less sensitive to carrier frequency offset and power amplifier nonlinearities while keeping a similar spectral efficiency with OFDM due to single-carrier characteristics. QOTDM is a suitable consideration for the downlink transmission such as in satellite c

APA, Harvard, Vancouver, ISO, and other styles

22

Aljanaby, Ashwaq A. Abed, and Malathe Salah AL Deen Salah AL -Deen. "ADAPTIVE CYCLIC PREFIX LENGTH FOR CONVOLUITIONAL CODE OFDM SYSTEM IN FREQUENCY SELECTIVE CHANNEL." Journal of Engineering 18, no. 1 (2023): 51–63. http://dx.doi.org/10.31026/j.eng.2012.01.04.

Full text

Abstract:

Orthogonal Frequency Division Multiplexing (OFDM) is one of recent years multicarrier modulation used in order to combat the Inter Symbol Interference (ISI) introduced by frequency selective mobile radio channel. The circular extension of the data symbol, commonly referred to as cyclic prefix is one of the key elements in an OFDM transmission scheme. This paper study The influence of the cyclic prefix duration on the BER performance of an OFDM-VCPL (Orthogonal frequency division multiplexing - Variable Cyclic Prefix Length) system and the conventional OFDM system with frame 64-QAM modulation i

APA, Harvard, Vancouver, ISO, and other styles

23

Li, Yong, Zhengguang Zheng, Mingyue Zhao, Shan Jin, and Zhangqin Huang. "Chunk-Based Energy Efficient Resource Allocation in OFDMA Systems." Mathematical Problems in Engineering 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/613470.

Full text

Abstract:

Energy efficiency (EE) capacity analysis of the chunk-based resource allocation is presented by considering the minimum spectrum efficiency (SE) constraint in downlink multiuser orthogonal frequency division multiplexing (OFDM) systems. Considering the minimum SE requirement, an optimization problem to maximize EE with limited transmit power is formulated over frequency selective channels. Based on this model, a low-complexity energy efficient resource allocation is proposed. The effects of system parameters, such as the average channel gain-to-noise ratio (CNR) and the number of subcarriers p

APA, Harvard, Vancouver, ISO, and other styles

24

Abdourahamane, Ali. "ADVANTAGES OF OPTICAL ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING IN COMMUNICATIONS SYSTEMS." EUREKA: Physics and Engineering 2 (March 31, 2016): 27–33. http://dx.doi.org/10.21303/2461-4262.2016.00058.

Full text

Abstract:

The role of the optical transmitter is to generate the optical signal, impose the information bearing signal, and launch the modulated signal into the optical fiber. The semiconductor light sources are commonly used in state-of-the-art optical communication systems. Optical communication systems has become one of the important systems after the advent of telephone, internet, radio networks in the second half of the 20th century. The development of optical communication was caused primarily by the rapidly rising demand for Internet connectivity. Orthogonal frequency-division multiplexing (OFDM)

APA, Harvard, Vancouver, ISO, and other styles

25

Fan, Tong Liang, and Lian Qing Fu. "Channel Estimation for OFDM System with Regularized Total Least-Squares Solution." Key Engineering Materials 467-469 (February 2011): 1621–26. http://dx.doi.org/10.4028/www.scientific.net/kem.467-469.1621.

Full text

Abstract:

Orthogonal frequency-division multiplexing (OFDM) combines the advantages of high performance and relatively low implementation complexity. However, for reliable coherent detection of the input signal, the OFDM receiver needs accurate channel information. The Doppler shift of fast-fading channels will generate inter-carrier interference (ICI) and, hence, degrade the performance of orthogonal frequency-division multiplexing (OFDM) systems. In this paper, we present regularized total least-squares (RTLS) scheme to eliminate the ICI and noise. A closed-form mathematical expression has been derive

APA, Harvard, Vancouver, ISO, and other styles

26

Bai, Yiqi, and Pierre-Jean Bouvet. "Orthogonal Chirp Division Multiplexing for Underwater Acoustic Communication." Sensors 18, no. 11 (2018): 3815. http://dx.doi.org/10.3390/s18113815.

Full text

Abstract:

The objective of this study is to investigate a novel Underwater Acoustic Communication (UWAC) system based on a modulated chirp signal termed as Orthogonal Chirp Division Multiplexing (OCDM). Originating from the Fresnel transform, OCDM uses chirp signals to exploit the multipath diversity of the channel, achieving a good robustness against frequency fading, especially in the underloaded scenario where only a subset of the available waveforms is modulated. The implementation of the OCDM system for the UWAC scenario is described, and the performance results over an experimental water tank and

APA, Harvard, Vancouver, ISO, and other styles

27

Chen, Chien Sheng, Yung Chuan Lin, He Nian Shou, and Chi Tien Sun. "Compensation of Phase Noise Effects for IEEE 802.16e OFDMA Systems." Advanced Materials Research 204-210 (February 2011): 1330–35. http://dx.doi.org/10.4028/www.scientific.net/amr.204-210.1330.

Full text

Abstract:

Orthogonal frequency division multiplexing (OFDM) system which provides high spectral efficiency has obvious advantages in robustness against the multipath delay spread and the fading channel. One of the major disadvantages of such a multi-carrier modulated system is the sensitivity of its performance to synchronization error, such as phase noise and frequency offset. Phase noise is caused by the mismatch between the transmitter and the receiver oscillators. Phase noise in an OFDM system can destroy the orthogonality of the subcarriers and cause inter-carrier interference (ICI). Phase noise re

APA, Harvard, Vancouver, ISO, and other styles

28

Ding, Qingan, Li Zheng, Huixin Liu, et al. "Design and Performance Analysis of Hybrid Multidimensional OAM-DM-WDM-OFDM-PON System with High-Capacity and Long-Distance Transmission." Photonics 9, no. 7 (2022): 448. http://dx.doi.org/10.3390/photonics9070448.

Full text

Abstract:

Orbital angular momentum (OAM) with mutually orthogonal advantage attribute to break through the high capacity and long-reach transmission limited in the classical passive optical network (PON). Employing Laguerre Gaussian (LG) mode as the orthogonal OAM excitation, a more dimensional multiplexing PON system is proposed to creatively hybridize OAM division multiplexing (OAM-DM) based on wavelength division multiplexing (WDM) and orthogonal frequency division multiplexing (OFDM). By utilizing the compatibility of OAM-DM and WDM, data of 40 Gbit/s OFDM signals is successfully transmitted in 80 k

APA, Harvard, Vancouver, ISO, and other styles

29

Shakhtarin, B. I., V. V. Chudnikov, and R. M. Dyabirov. "Methods of Frequency Synchronization of OFDM Signals in an Underwater Acoustic Channel." Herald of the Bauman Moscow State Technical University. Series Instrument Engineering, no. 4 (127) (August 2019): 62–70. http://dx.doi.org/10.18698/0236-3933-2019-4-62-70.

Full text

Abstract:

Application of signals with orthogonal frequency division multiplexing in underwater communication systems allows efficient use of the information transfer channel bandwidth and thereby increase the carrying capacity of the system. Among the main distinguishing features of the underwater channel there are the relatively low speed of sound propagation in water, multiple reflections from the water surface and the bottom of the reservoir and the Doppler effect, which leads to compression / stretching of the signal in time. The model of the underwater acoustic channel was developed on the assumpti

APA, Harvard, Vancouver, ISO, and other styles

30

Ahmed, Abu Shakil, Husam Al-amaireh, and Zsolt Kollar. "Multicarrier Modulation Schemes for 5G Wireless Access." ECTI Transactions on Computer and Information Technology (ECTI-CIT) 16, no. 4 (2022): 378–92. http://dx.doi.org/10.37936/ecti-cit.2022164.248710.

Full text

Abstract:

The 5G wireless access technology will supersede its predecessor, 4G, in the current decade, at first coexisting with it and later as a standalone technology. This work examines and compares the performance of the following orthogonal multicarrier schemes: Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM), Windowed Orthogonal Frequency Division Multiplexing (W-OFDM), Filtered Orthogonal Frequency Division Multiplexing (F-OFDM), Universal Filtered Multi-Carrier (UFMC), and Filter Bank Multi-Carrier (FBMC). The system architecture of each scheme is investigated while considering

APA, Harvard, Vancouver, ISO, and other styles

31

Banerjee, Purnima. "Transmission of Data over Orthogonal Frequency Division Multiplexing (OFDM)." International Journal of P2P Network Trends and Technology 13 (November 25, 2014): 11–15. http://dx.doi.org/10.14445/22492593/ijptt-v13p403.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Kamorudeen Adewale, Rahmon, Ogunti Erastus Olarewaju, and Apena Waliu Olalekan. "Characterization of Orthogonal Frequency Division Multiplexing (OFDM) Communication Links." American Journal of Electrical and Electronic Engineering 8, no. 3 (2020): 91–97. http://dx.doi.org/10.12691/ajeee-8-3-4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Et.al, G. Jagga Rao. "Milli meter Wave MIMO-OFDMA Scheme with MMSE-based VEMF in 6G Wireless Technology." Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 3 (2021): 4701–7. http://dx.doi.org/10.17762/turcomat.v12i3.1890.

Full text

Abstract:

Millimetre Wave (MmWave) massive multiple-input multiple-output (MmWave-massive-MIMO) has developed as beneficial for gigabit-per-second data broadcast into 6G digitized wireless technology. The collection of low-rate and energy-efficient (EE) types of machinery, low power consumptions, multi-bit quantized massive MIMO-Orthogonal Frequency Division Multiplexing Access (OFDMA) structure have been planned for the receiver manner. The main concentration effort is the minimization of a state-of-the-art pilot-symbol quantized (PSQ) massive MIMO-OFDMA system (m-MIMO-OFDM-S). Accordingly, in this ana

APA, Harvard, Vancouver, ISO, and other styles

34

Wirastuti, N. M. A. E. Dewi, I. G. A. K. Diafari Djuni Hartawan, I. Made Arsa Suyadnya, and Duman Care Khrisne. "Carrier Frequency Offset Effects on OFDM System over Rayleigh Fading Channel." Journal of Electrical, Electronics and Informatics 3, no. 2 (2020): 45. http://dx.doi.org/10.24843/jeei.2019.v03.i02.p03.

Full text

Abstract:

Orthogonal Frequency Division Multiplexing (OFDM) system showed the use of Discrete Fourier Transform (DFT) and Inverse Discrete Fourier Transform (IDFT) to perform the baseband modulation and demodulation. So that, it can increase and improve the efficiency of the modulation and demodulation. Currently, the OFDM is being utilized in the field of broadband wireless communication, which transmit signals orthogonally, that increases speed of information transmission. It also has high proficiency with high bandwidth and provide large data rates and robust against the multipath delay spread. On th

APA, Harvard, Vancouver, ISO, and other styles

35

Moreira, Túlio Fernandes, Ândrei Camponogara, Sobia Baig, and Moisés Vidal Ribeiro. "Performance Analysis of Orthogonal Multiplexing Techniques for PLC Systems with Low Cyclic Prefix Length and Symbol Timing Offset." Sensors 23, no. 9 (2023): 4363. http://dx.doi.org/10.3390/s23094363.

Full text

Abstract:

This paper investigates the degradation caused by interference resulting from cyclic prefix violation and symbol timing offset in narrowband power line communication systems. In this sense, it presents a unified formulation from which Hermitian symmetric orthogonal frequency division multiplexing (HS-OFDM), orthogonal chirp division multiplexing (OCDM), single-carrier cyclic prefix (SCCP), and orthogonal time–frequency division multiplexing (OTFDM) can be easily derived. The paper then provides closed-form expressions for quantifying the aforementioned interference in the presence of a frequen

APA, Harvard, Vancouver, ISO, and other styles

36

Ahmad and Chang. "Downlink Power Allocation Strategy for Next-Generation Underwater Acoustic Communications Networks." Electronics 8, no. 11 (2019): 1297. http://dx.doi.org/10.3390/electronics8111297.

Full text

Abstract:

The increasing interest in next-generation underwater acoustic communications networks is due to vast investigation of oceans for oceanography, commercial operations in maritime areas, military surveillance, and more. A surface buoy or underwater base station controller (UBSC) communicates with either transceivers or underwater base stations (UBSs) via acoustic links. Transceivers further communicate with underwater sensor nodes using acoustic links. In this paper, we employ a downlink (DL) power allocation (PA) strategy using an orthogonal frequency-division multiple access (OFDMA) technique

APA, Harvard, Vancouver, ISO, and other styles

37

Kumar, Abhishek. "ON VARIOUS TECHNIQUES IN OFDM AND GFDM: A SURVEY." International Journal of Students' Research in Technology & Management 5, no. 4 (2017): 39–45. http://dx.doi.org/10.18510/ijsrtm.2017.545.

Full text

Abstract:

Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation that divides the available spectrum into a finite number of carriers and applied into a digital transmission system. But it has some drawbacks such as sensitivity in inter-carrier interference, high peak to average power ratio and insufficient cyclic prefix in spectrum. These drawbacks may be reduced by a technique known as Generalized Frequency Division Multiplexing (GFDM). In the present scenario, it is a high speed multi-carrier multiplexing data transfer scheme for the cellular network. This paper deals with a

APA, Harvard, Vancouver, ISO, and other styles

38

Al-Asady, Heba Abdul-Jaleel, Hassan Falah Fakhruldeen, and Mustafa Qahtan Alsudani. "Channel estimation of OFDM in C-band communication systems under different distribution conditions." Indonesian Journal of Electrical Engineering and Computer Science 23, no. 3 (2021): 1778. http://dx.doi.org/10.11591/ijeecs.v23.i3.pp1778-1782.

Full text

Abstract:

<p>Orthogonal frequency division multiplexing (OFDM) is a transmission system that uses multiple orthogonal carriers that are sent out at the same time. OFDM is a technique for mobile and wireless communication that has high-efficient frequency utilization, high data-rate transmission, simple and efficient implementation using the fast Fourier transform (FFT) and the inverse fast Fourier transform (IFFT), and reduces inter symbol interference (ISI) by inserting cyclic prefix (CP). One of the most important approaches in an OFDM system is channel estimation. In this paper, the orthogonal

APA, Harvard, Vancouver, ISO, and other styles

39

Yadav, Sarita, Ashish Nema, and Jitendra Mishra. "Space Time Trellis Code Frequency Index Modulation with Neuro-LS Channel Estimation in OFDM." SMART MOVES JOURNAL IJOSCIENCE 5, no. 9 (2019): 7. http://dx.doi.org/10.24113/ijoscience.v5i9.226.

Full text

Abstract:

In wireless communication, orthogonal frequency division multiplexing (OFDM) plays a major role because of its high transmission rate. In space-time shift keying (STSK), the information is conveyed by both the spatial and time dimensions, which can be used to strike a trade-off between the diversity and multiplexing gains. On the other hand, orthogonal frequency division multiplexing (OFDM) relying on index modulation (IM) conveys information not only by the conventional signal constellations as in classical OFDM, but also by the indices of the subcarriers. In this paper compressed sensing(CS)

APA, Harvard, Vancouver, ISO, and other styles

40

Reddy, D. Yamini, K. Hari Hruthvik, M. Harsha Vardhan Reddy, and Pendli Pradeep. "Reduction of PAPR and improved BER using SLM technique." International Journal for Research in Applied Science and Engineering Technology 10, no. 6 (2022): 852–57. http://dx.doi.org/10.22214/ijraset.2022.43887.

Full text

Abstract:

Abstract: With the introduction of 5G wireless technology, mankind has achieved a massive leap in data throughput of gigabits per second thanks to the combination of multiple input, multiple output, and orthogonal frequency division multiplexing technologies. Multiple (OFDM MIMO) can be achieved via frequency selective fading. PAPR (Peak-to-Average Power Ratio) is one of the most crucial performance concerns, since it makes OFDM particularly prone to harmonic distortion, reducing channel estimate accuracy and resulting in a lower bit error rate (BER). In the MIMO-OFDM system, we present a sele

APA, Harvard, Vancouver, ISO, and other styles

41

K M, Delphin Raj, Sun-Ho Yum, Eunbi Ko, Soo-Young Shin, Jung-Il Namgung, and Soo-Hyun Park. "Multi-Media and Multi-Band Based Adaptation Layer Techniques for Underwater Sensor Networks." Applied Sciences 9, no. 15 (2019): 3187. http://dx.doi.org/10.3390/app9153187.

Full text

Abstract:

In the last few decades, underwater communication systems have been widely used for the development of navy, military, business, and safety applications, etc. However, in underwater communication systems, there are several challenging issues, such as limitations in bandwidth, propagation delay, 3D topology, media access control, routing, resource utilization, and power constraints. Underwater communication systems work under severe channel conditions such as ambient noise, frequency selectivity, multi-path and Doppler shifts. In order to collect and transmit the data in effective ways, multi-m

APA, Harvard, Vancouver, ISO, and other styles

42

Soni, G. "Performance Evaluation of OFDM Based Link Using LabVIEW 2012." Information Technologies and Control 14, no. 4 (2016): 33–38. http://dx.doi.org/10.1515/itc-2017-0015.

Full text

Abstract:

Abstract Background: Orthogonal Frequency Division Multiplexing (OFDM) has emerged as the core technology of the 4th generation mobile communication due to its capacity to combat channel fading also OFDM is highly spectral efficient. Methods/Statistical Analysis: LabVIEW 2012 is used to simulate and evaluate the performance of OFDM link. Bit Error Rate (BER) evaluation of discrete Fourier transform (DFT) based OFDM system is carried out in this work. The simulation based analysis is demonstrated by means of different modulation schemes like QPSK, 16-QAM for OFDM based wireless system. Findings

APA, Harvard, Vancouver, ISO, and other styles

43

Gunawan, Wahyu-Hendra, Yang Liu, Chi-Wai Chow, Yun-Han Chang, and Chien-Hung Yeh. "High Speed Visible Light Communication Using Digital Power Domain Multiplexing of Orthogonal Frequency Division Multiplexed (OFDM) Signals." Photonics 8, no. 11 (2021): 500. http://dx.doi.org/10.3390/photonics8110500.

Full text

Abstract:

In order to increase transmission capacity, multiplexing schemes in different physical dimensions, including time, frequency, modulation quadrature, polarization, and space, can be employed. In this work, we propose and demonstrate a red color laser-diode (LD) based visible-light-communication (VLC) system using two kinds of digital domain multiplexing schemes, orthogonal-frequency-division-multiplexing (OFDM) and power-domain division-multiplexing (PowDM). The two digital domain multiplexed data can achieve data rates of 1.66 Gbit/s and 6.41 Gbit/s, respectively, providing a total data rate o

APA, Harvard, Vancouver, ISO, and other styles

44

Ch, Gangadhar, and Md Habibulla. "Lucas Algorithm for Medical Images Encryption and Transmission using Orthogonal Frequency Division Multiplexing for Medical Health Information Systems and its VLSI Realization." International Journal of Online and Biomedical Engineering (iJOE) 17, no. 06 (2021): 128. http://dx.doi.org/10.3991/ijoe.v17i06.23107.

Full text

Abstract:

<p>Security of medical images is critical for transmission of medical images and relevant patient information through public health information systems networks. Image encryption is an important tool for protecting Medical images by converting them into unrecognisable formats for the transmission and receiption of medical images. This paper proposes an algorithm for medical image encryption using Lucas Algorithm, and a discrete wavelet transform based transmission and reception technique, which is known as orthogonal frequency division multiplexing(OFDM). This paper presents an implement

APA, Harvard, Vancouver, ISO, and other styles

45

Lian, Jie, Yan Gao, Peng Wu, and Dianbin Lian. "Orthogonal Frequency Division Multiplexing Techniques Comparison for Underwater Optical Wireless Communication Systems." Sensors 19, no. 1 (2019): 160. http://dx.doi.org/10.3390/s19010160.

Full text

Abstract:

Optical wireless communication is an energy-efficient and cost-effective solution for high-speed and highly-secure wireless connections. In this paper, we compare, discuss, and analyze three popular optical orthogonal frequency division multiplexing (OFDM) techniques, such as DC-biased optical OFDM (DCO-OFDM), asymmetrically-clipped optical OFDM (ACO-OFDM), and unipolar OFDM (U-OFDM), for underwater optical wireless communication systems. The peak power constraint, bandwidth limit of the light source, turbulence fading underwater channel, and the channel estimation error are taken into account

APA, Harvard, Vancouver, ISO, and other styles

46

Amertet, Sairoel. "F-OFDM in a novel form for analyzing 5G networks." Journal of Information Technology and Computing 3, no. 1 (2022): 1–16. http://dx.doi.org/10.48185/jitc.v3i1.489.

Full text

Abstract:

The need for internet of things (IoT) and machine-to-machine communication (MTC) has been growing rapidly all across the world. To meet the client's needs, many literature reviews were undertaken in several countries. Orthogonal frequency division multiplexing (OFDM), Universal Filtered Multi-Carrier (UFMC), filter-bank multicarrier offset construction amplitude modulation (FBMC-OQAM), generalized frequency division multiplexing (GFDM), and others are candidates for LTE, LTE advance, and 5G, according to the majority of the researchers. However, because it is sensitive to propagation and noise

APA, Harvard, Vancouver, ISO, and other styles

47

Chen, Lu, Jianxiong Pan, Jing Zhang, Junfeng Cheng, Luyan Xu, and Neng Ye. "FDSS-Based DFT-s-OFDM for 6G Wireless Sensing." Sensors 23, no. 3 (2023): 1495. http://dx.doi.org/10.3390/s23031495.

Full text

Abstract:

Integrated sensing and communications (ISAC) is emerging as a key technology of 6G. Owing to the low peak-to-average power ratio (PAPR) property, discrete Fourier transform spread orthogonal frequency-division multiplexing (DFT-s-OFDM) is helpful to improve the sensing range and suitable for high-frequency transmission. However, compared to orthogonal frequency-division multiplexing (OFDM), the sensing accuracy of DFT-s-OFDM is relatively poor. In this paper, frequency-domain spectral shaping (FDSS) is adopted to enhance the performances of DFT-s-OFDM including sensing accuracy and PAPR by adj

APA, Harvard, Vancouver, ISO, and other styles

48

Guo, Kai, Yun Jia Zhang, Dan Luo, and Zhuo Liu. "High Capacity and Power Efficient PON Combining ACO-OFDM and WDM Technologies." Advanced Materials Research 909 (March 2014): 260–64. http://dx.doi.org/10.4028/www.scientific.net/amr.909.260.

Full text

Abstract:

An upstream transmission scheme of asymmetric clipping optical orthogonal frequency division multiplexing (ACO-OFDM) based WDMA-PON is proposed. Performance of 10Gbit/s/ONU upstream ACO-OFDM signal is analyzed. The scheme is high capacity and power efficient.

APA, Harvard, Vancouver, ISO, and other styles

49

Cashion, Avery, and Grzegorz Cieslewki. "High Temperature Quadrature Amplitude Modulation over Orthogonal Frequency Division Multiplexing." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2017, HiTEN (2017): 000020–30. http://dx.doi.org/10.4071/2380-4491.2017.hiten.20.

Full text

Abstract:

As downhole tools advance, they require increasingly higher data rates in communication with the surface. Current data rates over HT single-conductor wireline are limited to approximately 200 kbps. Long cables and harsh environments create a limiting challenge to standard serial bit rates due to high cable impedance and component availability. Keying techniques are often used to improve the robustness and speed of data links over long cables. Frequency shift keying (FSK) is a common implementation where data is encoded by specific frequencies on the data line. Amplitude shift keying (ASK) and

APA, Harvard, Vancouver, ISO, and other styles

50

Rashid Ahmed, Saadaldeen, Ahmed S.Abdullah, and Nayif Mohammed Hammash. "Universal Filtered Multicarrier (UFMC) vs. Orthogonal Frequency Division Multiplexing (OFDM)." Journal of Physics: Conference Series 1530 (May 2020): 012092. http://dx.doi.org/10.1088/1742-6596/1530/1/012092.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!