Academic literature on the topic 'Orthogonal frequency division multiplexing. Wireless communication systems. Broadband communication systems'

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Journal articles on the topic "Orthogonal frequency division multiplexing. Wireless communication systems. Broadband communication systems"

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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.

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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
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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.

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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
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MINOMO, MASAHIRO, and TATSURO MASAMURA. "PROSPECTS FOR MOBILE COMMUNICATION SYSTEMS AND KEY TECHNOLOGIES CAPABLE OF SUPPORTING EXPANDING MOBILE MULTIMEDIA SERVICES." Journal of Circuits, Systems and Computers 13, no. 02 (2004): 237–51. http://dx.doi.org/10.1142/s0218126604001404.

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The first commercial service of the 3rd generation (3G) mobile communication system, IMT-2000 (International Mobile Telecommunications), was launched in October 2001 in Japan. This is the first 3G service employing Wideband Code Division Multiple Access (W-CDMA) as its air interface between mobile terminals and base stations. This new system, 3G, is expected to accelerate the deployment of future mobile multimedia services, which substantially got started with the "i-mode" service in February 1999 in Japan. Research activities into future mobile communication systems capable of supporting a va
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Çalişir, Bircan, and Ayhan Akbal. "Hardware Prototyping and Modelling of Prototype Filter for FBMC." Wireless Communications and Mobile Computing 2020 (November 16, 2020): 1–10. http://dx.doi.org/10.1155/2020/8831568.

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Filter bank multicarrier (FBMC) is one of the effective candidates for the fifth generation of wireless communication networks. 5G (5th-generation wireless systems) is accepted as the next major stage of mobile telecommunication technology. The extent of 5G will be expanded mobile broadband services to next-generation automobiles and connected machines. In particular, filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) is determined as the future generation 5G air interface by researchers recently. Filter bank multicarrier (FBMC) is admitted as one of the alternati
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Louliej, Abdelhamid, Younes Jabrane, Víctor P. Gil Jiménez, and Frédéric Guilloud. "Dimensioning an FPGA for Real-Time Implementation of State of the Art Neural Network-Based HPA Predistorter." Electronics 10, no. 13 (2021): 1538. http://dx.doi.org/10.3390/electronics10131538.

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Orthogonal Frequency Division Multiplexing (OFDM) is one of the key modulations for current and novel broadband communications standards. For example, Multi-band Orthogonal Frequency Division Multiplexing (MB-OFDM) is an excellent choice for the ECMA-368 Ultra Wideband (UWB) wireless communication standard. Nevertheless, the high Peak to Average Power Ratio (PAPR) of MB-OFDM UWB signals reduces the power efficiency of the key element in mobile devices, the High Power Amplifier (HPA), due to non-linear distortion, known as the non-linear saturation of the HPA. In order to deal with this limitin
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El Ghzaoui, M., A. Hmamou, J. Foshi, and J. Mestoui. "Compensation of Non-linear Distortion Effects in MIMO-OFDM Systems Using Constant Envelope OFDM for 5G Applications." Journal of Circuits, Systems and Computers 29, no. 16 (2020): 2050257. http://dx.doi.org/10.1142/s0218126620502576.

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Orthogonal frequency division multiplexing (OFDM) is a multicarrier transmission system that can achieve high data rate over wireless channels. At the same time, multiple input multiple output OFDM (MIMO-OFDM) in wireless communication systems has been exposed to offer significant improvement over wireless technology by providing transmit diversity. It has become a promising technique for high-performance 5G broadband wireless communications. However, the main problem associated with MIMO-OFDM is that its signal exhibits high peak-to-average power ratio (PAPR), which causes nonlinear distortio
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Zheng, Zi Wei. "Frame Synchronization for the DTMB Systems with the Multiple-Antenna Receivers." Advanced Engineering Forum 6-7 (September 2012): 434–38. http://dx.doi.org/10.4028/www.scientific.net/aef.6-7.434.

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Faced with the challenges of modern communication, high data throughput requirements, extensive research has been paid to broadband modulation. The multi-carrier modulation is one of the most important wide band modulation techniques. Orthogonal frequency division multiplexing (OFDM) is an effective blow to the broadcast channel multipath fading and high bit rate transmission multi-carrier modulation technology of wireless channels, it is widely used in modern digital television terrestrial broadcasting (DTTB) system to support performance bandwidth-efficient multimedia services with the aid o
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Kareem, Marwa M., Sameer A. S. Lafta, Hadi Fakhir Hashim, Raed Khalid Al-Azzawi, and Adnan Hussein Ali. "Analyzing the BER and optical fiber length performances in OFDM RoF links." Indonesian Journal of Electrical Engineering and Computer Science 23, no. 3 (2021): 1501. http://dx.doi.org/10.11591/ijeecs.v23.i3.pp1501-1509.

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Radio over fiber (RoF) can be assessed as a system of most convenient combination of optical fiber and radio signals. The technique of orthogonal frequency division multiplexing (OFDM) considers as a data distribution over a huge number of carriers having spaced from each other with specific frequencies at overlap bands. Hence incorporates OFDM with the optical fiber, OFDM-RoF system can be increased the modulation RF access capacity besides high-speed data transmission, it considers a broadband communication trend of the current and future applications specifically for 5G mobile. The optical
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Jake, J., E. Mwangi, and K. Langat. "Spectral Re-Growth Suppression in the FBMC-OQAM Signal Under the Non-linear Behavior of a Power Amplifier." Engineering, Technology & Applied Science Research 9, no. 5 (2019): 4801–7. http://dx.doi.org/10.48084/etasr.3097.

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Typically, the filter bank multicarrier with offset quadrature amplitude modulation (FBMC-OQAM) bears some impressive properties that make it popular as one of the substitutes to orthogonal frequency division multiplexing (OFDM) for the upcoming technology of broadband wireless communication systems. Although FBMC-OQAM preserves the multicarrier modulation (MCM) features, its spectrum usually suffers from impairments when subjected to the nonlinear behavior of a power amplifier (PA) which results in spectral re-growth. Due to the spectrum limitation and low energy efficiency foreseen in the fo
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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.

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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)
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Dissertations / Theses on the topic "Orthogonal frequency division multiplexing. Wireless communication systems. Broadband communication systems"

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Li, Guoqing. "Resource allocation in OFDMA networks /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/6136.

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Shao, Lei. "Code design for MIMO-OFDM(A) systems /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/5859.

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Zheng, Haomian. "Performance and implementation issues of a multi-band OFDM ultra-wideband transceiver /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?ECED%202008%20ZHENGH.

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Lei, Sai-weng. "Adaptive interleaving for orthogonal frequency division multiplexing systems /." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk:8888/cgi-bin/hkuto%5Ftoc%5Fpdf?B23295065.

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李世榮 and Sai-weng Lei. "Adaptive interleaving for orthogonal frequency division multiplexing systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31224702.

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Oz, Ersoy. "A comparison of timing methods in orthogonal frequency division multiplexing (OFDM) systems." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Sep%5FOz.pdf.

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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, Sept. 2004.<br>Thesis Advisor(s): Roberto Cristi, Murali Tummala. Includes bibliographical references (p. 169-173). Also available online.
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Clark, Alan. "On Coding for Orthogonal Frequency Division Multiplexing Systems." Thesis, University of Canterbury. Electrical and Computer Engineering, 2006. http://hdl.handle.net/10092/1092.

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The main contribution of this thesis is the statistical analysis of orthogonal frequency di- vision multiplexing (OFDM) systems operating over wireless channels that are both fre- quency selective and Rayleigh fading. We first describe the instantaneous capacity of such systems using a central limit theorem, as well as the asymptotic capacity of a power lim- ited OFDM system as the number of subcarriers approaches infinity. We then analyse the performance of uncoded OFDM systems by first developing bounds on the block error rate. Next we show that the distribution of the number of symbol
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Zhang, Hua. "Orthogonal Frequency Division Multiplexing for Wireless Communications." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4960.

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OFDM is a promising technique for high-data-rate wireless communications because it can combat inter-symbol interference (ISI) caused by the dispersive fading of wireless channels. The proposed research focuses on techniques that improve the performance of OFDM-based wireless communications and its commercial and military applications. In particular, we address the following aspects of OFDM: inter-channel interference (ICI) suppression, interference suppression for clustered OFDM, clustered OFDM based anti-jamming modulation, channel estimation for MIMO-OFDM, MIMO transmission with limited fee
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Lee, King F. "Space-time and space-frequency coded orthogonal frequency division multiplexing transmitter diversity techniques." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/14981.

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Bala, Erdem. "Multichannel, multiuser and multiple antenna wireless communication systems." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 184 p, 2007. http://proquest.umi.com/pqdlink?did=1251904851&Fmt=7&clientId=79356&RQT=309&VName=PQD.

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Books on the topic "Orthogonal frequency division multiplexing. Wireless communication systems. Broadband communication systems"

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1974-, Li Guoqing, ed. OFDM-based broadband wireless networks: Design and optimization. J. Wiley, 2005.

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OFDM towards fixed and mobile broadband wireless access. Artech House, 2007.

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Michele, Morelli, and Kuo C. C. Jay, eds. Multi-carrier techniques for broadband wireless communications: A signal processing perspective. Imperial College Press, 2007.

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Juha, Heiskala, ed. OFDM wireless LANs: A theoretical and practical guide. Sams, 2002.

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Ramjee, Prasad, ed. OFDM wireless multimedia communications. Artech House, 2000.

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Yang, Samuel C. OFDMA system analysis and design. Artech House, 2010.

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MIMO-OFDM wireless communications with MATLAB. IEEE Press, 2010.

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Yang, Hong-Chuan. Order statistics in wireless communications: Diversity, adaptation, and scheduling in MIMO and OFDM systems. Cambridge University Press, 2011.

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Chiueh, Tzi-Dar. Baseband receiver design for wireless MIMO-OFDM communications. 2nd ed. Wiley, 2012.

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Bader, Faouzi, and Nizar Zorba. Advances on processing for multiple carrier schemes: OFDM & OFDMA. Nova Science Publishers, 2011.

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Book chapters on the topic "Orthogonal frequency division multiplexing. Wireless communication systems. Broadband communication systems"

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Yang, Laurence, Tao Jiang, and Yan Zhang. "The Peak-to-Average Power Ratio in Orthogonal Frequency Division Multiplexing Wireless Communication Systems." In Broadband Mobile Multimedia. Auerbach Publications, 2008. http://dx.doi.org/10.1201/9781420051858.ch15.

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Abualhaol, Ibrahim Y., and Mustafa M. Matalgah. "Resource Allocation for a Cooperative Broadband MIMO-OFDM System." In Cooperative Communications for Improved Wireless Network Transmission. IGI Global, 2010. http://dx.doi.org/10.4018/978-1-60566-665-5.ch014.

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In this chapter, a cooperative broadband relay-based resource allocation technique is proposed for adaptive bit and power loading multiple-input-multiple-output/orthogonal frequency division multiplexing (MIMO-OFDM) system. In this technique, sub-channels allocation, M-QAM modulation order, and power distribution among different sub-channels in the relay-based MIMO-OFDM system are jointly optimized according to the channel state information (CSI) of the relay and the direct link. The transmitted stream of bits is divided into two parts according to a suggested cooperative protocol that is based on sub-channel-division. In this protocol, the first part is sent directly from the source to the destination, and the second part is relayed to the destination through an indirect link. Such a cooperative relay-based system enables us to exploit the inherent system diversities in frequency, space and time to maximize the system power efficiency. The BER performance using this cooperative sub-channel-division protocol with adaptive sub-channel assignment and adaptive bit/power loading are presented and compared with a noncooperative ones. The use of cooperation in a broadband relay-based MIMO-OFDM system showed high performance improvement in terms of BER.
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Bandopadhaya, Shuvabrata, and Jibendu Sekhar Roy. "Spectral Efficiency in Wireless Networks through MIMO-OFDM System." In Advances in Wireless Technologies and Telecommunication. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-0486-3.ch010.

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The traffic in Wireless Sensor Network (WSN) is brusty in nature; when any incident takes place, the data load on the channel increases suddenly demanding large channel spectrum. The scarcity of spectrum is the major technical obstacle for high data rate transmission along with better quality of service in any kind of wireless network. Hence it is very essential to enhance the spectrum efficiency of wireless channel. The major technical advancement in the physical layer which brings feasibility of broadband data transmission without increasing the transmission bandwidth or transmitting power are implementation of Multiple Input Multiple Output (MIMO) communication system with Orthogonal Frequency Division Multiplexing (OFDM) as modulation schemes. This chapter includes the fundamental concept of MIMO-OFDM system along with the channel estimation methods and the spectrum utilization issues therein.
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"Near-Ultrasonic Wireless Orthogonal Frequency Division MULTIPLEXING MODEM DESIGN." In Problem-Based Learning in Communication Systems Using Matlab and Simulink. John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119060239.ch30.

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Rohling, Hermann. "OFDM Transmission Technique." In Mobile Computing. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-60566-054-7.ch260.

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The orthogonal frequency division multiplexing (OFDM) transmission technique can efficiently deal with multi-path propagation effects especially in broadband radio channels. It also has a high degree of system flexibility in multiple access schemes by combining the conventional TDMA; FDMA; and CDMA approaches with the OFDM modulation procedure; which is especially important in the uplink of a multi-user system. In OFDM-FDMA schemes carrier synchronization and the resulting sub-carrier orthogonality plays an important role to avoid any multiple access interferences (MAI) in the base station receiver. An additional technical challenge in system design is the required amplifier linearity to avoid any non-linear effects caused by a large peak-to-average ratio (PAR) of an OFDM signal. The OFDM transmission technique is used for the time being in some broadcast applications (DVB-T; DAB; DRM) and wireless local loop (WLL) standards (HIPERLAN/2; IEEE 802.11a) but OFDM has not been used so far in cellular communication networks. The general idea of the OFDM scheme is to split the total bandwidth into many narrowband sub-channels which are equidistantly distributed on the frequency axis. The sub-channel spectra overlap each other but the sub-carriers are still orthogonal in the receiver and can therefore be separated by a Fourier transformation. The system flexibility and use of sub-carrier specific adaptive modulation schemes in frequency selective radio channels are some advantages which make the OFDM transmission technique a strong and technically attractive candidate for the next generation of mobile communications. The objective of this chapter is to describe an OFDM-based system concept for the fourth generation (4G) of mobile communications and to discuss all technical details when establishing a cellular network which requires synchronization in time and frequency domain with sufficient accuracy. In this cellular environment a flexible frequency division multiple access scheme based on OFDM-FDMA is developed and a radio resource management (RRM) employing dynamic channel allocation (DCA) techniques is used. A purely decentralized and self-organized synchronization technique using specific test signals and RRM techniques based on co-channel interference (CCI) measurements has been developed and will be described in this chapter.
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Al Bassam, Nizar, Vidhyalavanya Ramachandran, and Sumesh Eratt Parameswaran. "Wavelet Theory and Application in Communication and Signal Processing." In Wavelet Theory. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95047.

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Wavelet analysis is the recent development in applied mathematics. For several applications, Fourier analysis fails to provide tangible results due to non-stationary behavior of signals. In such situation, wavelet transforms can be used as a potential alternative. The book chapter starts with the description about importance of frequency domain representation with the concept of Fourier series and Fourier transform for periodic, aperiodic signals in continuous and discrete domain followed by shortcoming of Fourier transform. Further, Short Time Fourier Transform (STFT) will be discussed to induce the concept of time frequency analysis. Explanation of Continuous Wavelet Transform (CWT) and Discrete Wavelet Transform (DWT) will be provided with the help of theoretical approach involving mathematical equations. Decomposition of 1D and 2D signals will be discussed suitable examples, leading to application concept. Wavelet based communication systems are becoming popular due to growing multimedia applications. Wavelet based Orthogonal Frequency Division Multiplexing (OFDM) technique and its merit also presented. Biomedical signal processing is an emerging field where wavelet provides considerable improvement in performance ranging from extraction of abnormal areas and improved feature extraction scheme for further processing. Advancement in multimedia systems together with the developments in wireless technologies demands effective data compression schemes. Wavelet transform along with EZW, SPIHT algorithms are discussed. The chapter will be a useful guide to undergraduate and post graduate who would like to conduct a research study that include wavelet transform and its usage.
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Al Kattan, I. "Multi-User OFDM in Mobile Multimedia Network." In Encyclopedia of Mobile Computing and Commerce. IGI Global, 2007. http://dx.doi.org/10.4018/978-1-59904-002-8.ch114.

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The optimization of resource allocation in multi-user orthogonal frequency division multiplexing (OFDM) has been of great concern to the mobile commerce. The major concern is the allocation of subcarrier and power to different users in order to minimize the total transmitted power, consequently increasing the total data rate and improving the performance of the wireless communication system. Multi-user OFDM systems have been in use recently and seem promising for future mobile network applications. This research would mainly focus on modeling and improving the wireless communication system with multi-user OFDM. The proposed optimization techniques for OFDM wireless communication will be conducted in two phases. Phase one is to optimize the subcarrier allocation to mobile hosts, and the second phase is to optimize the power allocation (depends on the number of transmitted bits) in a multi-user OFDM system.
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S., Sankar Ganesh, Mohanaprasad K., Arunprakash Jayaprakash, and Sivanantham Sathasivam. "Optimized-Fuzzy-Logic-Based Bit Loading Algorithms." In Handbook of Research on Fuzzy and Rough Set Theory in Organizational Decision Making. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-1008-6.ch013.

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Next generation wireless communication systems promise the subscribers with Giga-bit-data-rate experience at low Bit Error Rate (BER) under adverse channel conditions. In order to maximize the overall system throughput of Orthogonal Frequency Division Multiplexing (OFDM), adaptive modulation is one of the key solutions. In adaptive modulated OFDM, the subcarriers are allocated with data bits and energy in accordance with the Signal to Interference Ratio (SIR) of the multipath channel, which is referred to as adaptive bit loading and adaptive power allocation respectively. The number of iterations required allocating the target bits and energy to a sub channel is optimized. The key choice of the paper is to allocate the bits with minimum number of iterations after clustering the sub channels using fuzzy logic. The proposed method exhibits a faster convergence in obtaining the optimal solution.
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Kaur, Inderjeet. "Frequency Domain Equalization and Adaptive OFDM vs. Single Carrier Modulation." In Innovations in Mobile Multimedia Communications and Applications. IGI Global, 2011. http://dx.doi.org/10.4018/978-1-60960-563-6.ch009.

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In the present article an attempt is made to compare multi-carrier and single carrier modulation schemes for wireless communication systems with the utilization of fast Fourier transform (FFT) and its inverse in both cases. With the assumption that in OFDM (orthogonal frequency division multiplexing), the inverse FFT transforms the complex amplitudes of the individual sub-carriers at the transmitter into time domain, the inverse operation is carried out at the receiver. In case of single carrier modulation, the FFT and its inverse are used at the input and output of the frequency domain equalizer in the receiver. Different single carrier and multi-carrier transmission systems are simulated with time-variant transfer functions measured with a wideband channel sounder. In case of OFDM, the individual sub-carriers are modulated with fixed and adaptive signal alphabets. Furthermore, a frequency-independent as well as the optimum power distribution are used. Single carrier modulation uses a single carrier, instead of the hundreds or thousands typically used in OFDM, so the peak-to-average transmitted power ratio for single carrier modulated signals is smaller. This in turn means that a SC system requires a smaller linear range to support a given average power. This enables the use of cheaper power amplifier as compared to OFDM system.[Article copies are available for purchase from InfoSci-on-Demand.com]
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Conference papers on the topic "Orthogonal frequency division multiplexing. Wireless communication systems. Broadband communication systems"

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Gayosso-Ri, Elsa, M. Mauricio Lara, Aldo G. Orozco-Lugo, and Desmond McLernon. "Symbol-Blanking Superimposed Training for Orthogonal Frequency Division Multiplexing systems." In 2010 7th International Symposium on Wireless Communication Systems (ISWCS 2010). IEEE, 2010. http://dx.doi.org/10.1109/iswcs.2010.5624254.

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Sivadasan, J. "Effectiveness of orthogonal frequency division multiplexing technique for wireless telecommunication systems." In IET-UK International Conference on Information and Communication Technology in Electrical Sciences (ICTES 2007). IEE, 2007. http://dx.doi.org/10.1049/ic:20070713.

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Lu, Feng, Lin Cheng, Mu Xu, Jing Wang, Shuyi Shen, and Gee-Kung Chang. "Orthogonal Chirp Division Multiplexing in Millimeter-Wave Fiber-Wireless Integrated Systems for Enhanced Mobile Broadband and Ultra-Reliable Communications." In Optical Fiber Communication Conference. OSA, 2017. http://dx.doi.org/10.1364/ofc.2017.th4e.5.

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Abdullahi, Muhammad Bello. "Appraisal of OFDM for multi-carrier, high-speed data rate wireless communication networks." In The 19th International Conference on Modelling and Applied Simulation. CAL-TEK srl, 2019. http://dx.doi.org/10.46354/i3m.2019.mas.002.

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Orthogonal Frequency Division Multiplexing (OFDM) is used to achieve multi-carrier signals and high- Speed data rate in free space. OFDM-based systems operate in the hostile multipath radio environment, which allows efficient sharing of limited resources. This research work was designed, developed and simulated an OFDM System using the basic blocks of Simulink in MATLAB/Simulink software, to support multi-carrier, high-speed data rates. This was achieved in backing of collection and review of high-quality research papers, which reported the latest research developments in OFDM communications n
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