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Статті в журналах з теми "Windowing-OFDM":
Sahin, Alphan, and Huseyin Arslan. "Edge Windowing for OFDM Based Systems." IEEE Communications Letters 15, no. 11 (November 2011): 1208–11. http://dx.doi.org/10.1109/lcomm.2011.090611.111530.
Muller-Weinfurtner, S. H. "Optimum Nyquist windowing in OFDM receivers." IEEE Transactions on Communications 49, no. 3 (March 2001): 417–20. http://dx.doi.org/10.1109/26.911448.
Zhang, Li Jun, Yu Wang, and Qiu Yu Zhu. "The Application of Partial Response Window in OFDM Systems without Guard Interval." Applied Mechanics and Materials 610 (August 2014): 867–77. http://dx.doi.org/10.4028/www.scientific.net/amm.610.867.
Castanheira, Daniel, and Atilio Gameiro. "Novel Windowing Scheme for Cognitive OFDM Systems." IEEE Wireless Communications Letters 2, no. 3 (June 2013): 251–54. http://dx.doi.org/10.1109/wcl.2013.020513.120848.
Muschallik, C. "Improving an OFDM reception using an adaptive Nyquist windowing." IEEE Transactions on Consumer Electronics 42, no. 3 (1996): 259–69. http://dx.doi.org/10.1109/30.536046.
Zhong, Qing Hua, Kai Yan Chen, and Han Zhang. "Equalization of Rapidly Varying Channels for OFDM Systems Using Subblock Tracking." Applied Mechanics and Materials 263-266 (December 2012): 1044–50. http://dx.doi.org/10.4028/www.scientific.net/amm.263-266.1044.
Pekoz, Berker, Zekeriyya Esat Ankarali, Selcuk Kose, and Huseyin Arslan. "Non-Redundant OFDM Receiver Windowing for 5G Frames and Beyond." IEEE Transactions on Vehicular Technology 69, no. 1 (January 2020): 676–84. http://dx.doi.org/10.1109/tvt.2019.2953233.
Yadav, Pankaj K., Vivek K. Dwivedi, V. Karwal, and J. P. Gupta. "A new windowing function to reduce ICI in OFDM systems." International Journal of Electronics Letters 2, no. 1 (November 28, 2013): 2–7. http://dx.doi.org/10.1080/21681724.2013.854155.
SONG, Rong-fang, Si AI, and Shu-hung LEUNG. "A Novel OFDM Receiver with Optimum Second Order Polynomial Nyquist Windowing." Journal of China Universities of Posts and Telecommunications 13, no. 2 (June 2006): 84–102. http://dx.doi.org/10.1016/s1005-8885(07)60110-1.
Islam, S. M. Riazul, and Kyung Sup Kwak. "Two-Stage Channel Estimation With Estimated Windowing for MB-OFDM UWB System." IEEE Communications Letters 20, no. 2 (February 2016): 272–75. http://dx.doi.org/10.1109/lcomm.2015.2499745.
Дисертації з теми "Windowing-OFDM":
Guo, Fukang, and Luoan Lu. "Overcoming Inter-carrier-interference in OFDM System." Thesis, Linköpings universitet, Kommunikationssystem, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-176637.
Etiler, Burkay. "Comparison Of The Intercarrier Interference Cancellation Methods In Ofdm Systems." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/2/12608825/index.pdf.
Conventional Pilots&rdquo
and &ldquo
Clustered Pilots&rdquo
pilot-aided CFO estimation techniques for ICI cancellation. Furthermore, we also implemented a new scheme by using the odd symmetry between pilot symbols. Nyquist windowing techniques apply windowing at the receiver side. We have implemented second order polynomial class of Nyquist windows and Nyquist window with Franks pulse used to mitigate ICI. These ICI cancellation methods are compared in AWGN and multipath Rayleigh fading channel models in terms of BER and carrier to interference ratio. It is shown that repeated data methods shows better performances than pilot-aided CFO estimation methods with a cost of increased bandwidth usage especially in high SNR&rsquo
s.
Huang, Yu-Ji, and 黃昱智. "An Intercarrier Interference Suppression Technique Using Time-Domain Windowing for OFDM Systems." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/32161030592207679095.
國立清華大學
通訊工程研究所
93
In orthogonal frequency division multiplexing (OFDM) systems, the property of spectrum overlapping in an orthogonal way makes the system very sensitive to the frequency offset, which is usually introduced by the mismatch of oscillators in the transmitter and receiver or the Doppler effect. It is well known that the intercarrier interference (ICI) caused by the frequency offset may significantly degrade the system performance. Conventional ICI self-cancellation schemes can mitigate the ICI effect dramatically without doing frequency offset compensation, but the expense of halving spectral efficiency makes them less valuable. On the other hand, ICI can be suppressed by performing correlative coding in the frequency domain without halving spectral efficiency; however, this scheme usually cannot provide satisfactory performance in terms of the carrier-to-interference ratio (CIR) and the detection errors generated in the receiver would be propagated through OFDM symbols. In this thesis, we propose a new ICI suppression scheme that can be regarded as an improved version of the approach based on correlative coding; the main difference is that, for the proposed scheme, the data of the last subcarrier in an OFDM symbol is encoded with that of the first subcarrier in the same OFDM symbol, instead of the data of the first subcarrier in the subsequent OFDM symbol used for the original approach. Due to the cyclic nature, the modified correlative encoding procedure in the frequency domain can be easily realized by a specific time-domain windowing process. As compared to the original correlative coding scheme, the modified approach achieves better performance for ICI suppression and prevents error propagation through OFDM symbols, with a slight increase in the computational complexity at the transmitter but no increase at the receiver. To verify the effectiveness of the proposed scheme, we not only derive the theoretical CIR, but also present a number of computer simulation results, where both of them match pretty well.
Chang, Chan-Shuo, and 張展碩. "Low Complex Windowing Method of ICI Reduction for OFDM Systems in Time-Varying Multipath Channels." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/56262994497205412030.
國立臺灣大學
電信工程學研究所
98
Orthogonal frequency division multiplexing (OFDM) systems may experience significant inter-carrier interference (ICI) when used in time- and frequency-selective, or doubly selective, channels. In high mobility environment mobile communication suffers from critical Doppler effect, the performance is decreasing due to fast fading. The structure of the traditional demodulation system in time-invariant channel can not conquer this problem, so that the BER is rapidly rising. In this thesis we take the advantage of the mechanism generated by ICI effect, and we proposed calculating method of the equalizer. This method contains two stages, the first stage applies time-domain windowing to restrict ICI support, and the second stage uses iterative estimation to estimate finite-alphabet frequency-domain symbols. Simulation results indicate that our equalizer has significant performance and complexity advantages over the classical linear MMSE estimator in doubly selective channels.
Conceição, Filipe João Abrantes Soares da. "New hybrid modulation techniques for future generations of communications." Master's thesis, 2019. http://hdl.handle.net/10316/88126.
As próximas gerações de comunicações móveis, designada por 5ª geração (5G) e pós-5G, possuem requisitos ambiciosos, nos quais se destacam as muito elevadas taxas de transferência de dados, requisitos de elevada eficiência espetral e de potência e também flexibilidade de transmissão em condições de canais adversas e a taxas variáveis. A técnica Orthogonal Frequency Division Multiplexing (OFDM) tem vindo a ser a mais utilizada pois apresenta vantagens interessantes, tais como, a fácil implementação baseada nos algoritmos da transformada de Fourier rápida (FFT) e a sua inversa (IFFT), e o facto de permitir uma igualização eficiente e de baixa complexidade no domínio da frequência. Para além disso, o OFDM apresenta-se como uma técnica robusta quando utilizada na transmissão de dados em canais dispersivos. No entanto, uma das desvantagens inerentes ao uso desta técnica está associada à sua eficiência espetral limitada, devido à elevada amplitude do seu espetro fora da banda útil de informação. Deste modo, o objetivo deste trabalho é o estudo de novas técnicas de modulação híbridas, nomeadamente, Time Interleaved Block Windowed Burst OFDM (TIBWB-OFDM) que permite aumentar a eficiência espetral e de potência, adaptadas a diversos ambientes móveis que se traduzem em canais dispersivos no tempo e na frequência. Esta é considerada uma técnica híbrida, pois combina características relativas a transmissão monoportadora e multiportadora. A forma de onda TIBWB-OFDM permite alcançar um maior confinamento no espetro de sinal que melhora com o aumento do roll-off da janela, uma vez que a amplitude do sinal fora da banda útil (out of band - OOB) diminui. No entanto, o comprimento dos blocos do sinal TIBWB-OFDM cresce temporalmente, correspondendo a uma diminuição da taxa de transmissão, limitando o aumento da eficiência espetral do sistema. Além disso, a operação de multiplicação pela janela é responsável pela redução da potência média do sinal, que, por sua vez, depende do valor do roll-off da janela. Como consequência, a relação entre a potência máxima e a potência média (peak-to-average power ratio - PAPR) do sinal TIBWB-OFDM tende a crescer à medida que o roll-off aumenta. Portanto, este trabalho propõe um método alternativo relativo à construção do símbolo TIBWB-OFDM, permitindo uma sobreposição parcial entre os símbolos OFDM adjacentes para reduzir o PAPR. Para além disso, a nova forma de onda ajuda a melhorar a eficiência espetral em detrimento da interferência introduzida entre os blocos do sinal, que contribui para a degradação nas performances em termos da taxa de erros (bit error rate - BER), que, por sua vez, depende do roll-off da janela. Para compensar o aumento na taxa de erros, este trabalho também propõe diferentes recetores, iterativos e não-iterativos, da técnica TIBWB-OFDM, com igualização em ambos os domínios da frequência e tempo, capazes de cancelar tanto as restrições dos canais dispersivos no tempo e a interferência resultante entre os blocos baseados em OFDM da forma de onda TIBWB-OFDM.
The future generations of mobile communications, known as 5th generation (5G) and post-5G, have ambitious requirements, which include very high data transfer rates, high spectral and power requirements, as well as transmission flexibility under conditions of adverse channels and at variable rates.The Orthogonal Frequency Division Multiplexing (OFDM) technique has been, since the 3rd generation (3G) of wireless communications, the preferred waveform of choice since it presents interesting advantages, such as the easy implementation based on the FFT and its inverse (IFFT) algorithms, and the fact that efficient equalization in the frequency domain can be performed. In addition, OFDM is a robust technique when transmitting through dispersive channels. However, one of the drawbacks inherent to the use this technique is associated with its limited spectral efficiency, due to the high amplitude of its spectrum outside the allocated bandwidth. In this way, the objective of this work is the study of new hybrid modulation techniques, namely Time Interleaved Block Windowed Burst OFDM (TIBWB-OFDM) that allows increasing spectral and power efficiency, adapted to diverse mobile environments that translate into time dispersive (TD) channels and frequency dispersive (FD) channels. This is considered a hybrid technique since it combines features related to single-carrier and multi-carrier transmission. The TIBWB-OFDM waveform enables to achieve greater confinement in the signal spectrum that improves with the increase of the window roll-off since the out of band (OOB) radiation drops. However, the TIBWB-OFDM blocks length grows in time domain, which corresponds to a decrease on the transmission rate, limiting the increase in the spectral efficiency of the system. Furthermore, the windowing operation is responsible for the reduction in the average power of the signal, which, in turn, depends on the value of the window roll-off. As a consequence, the peak-to-average power ratio (PAPR) of the TIBWB-OFDM signal tends to grow as the roll-off increases. Therefore, this work proposes an alternative method concerning the TIBWB-OFDM symbol construction by allowing a partial overlap between adjacent windowed OFDM-based symbols in order to reduce PAPR. Moreover, the new waveform helps to improve the spectral efficiency at the expense of introduced interference between the signal's blocks, that deteriorate the bit error rate (BER) performances, which, in turn, depends on the value of the window roll-off. In order to compensate the loss in BER, this work also proposes different TIBWB-OFDM receivers, iterative and non-iterative ones, with equalization at both frequency and time domains, able to cancel both TD channel constraints and interference between OFDM-based blocks of the TIBWB-OFDM waveform.
Outro - FCT/MEC e, quando aplicável, ao Fundo Europeu de Desenvolvimento Regional (FEDER), Programa Operacional Competitividade e Internacionalização (COMPETE 2020) e Programa Operacional Regional de Lisboa e Apoio Financeiro ao Público Nacional (FCT) (OE) financiou em parte este trabalho no âmbito dos projetos UID/EEA/ 50008/2019, MASSIVE5G (POCI-01-0145-FEDER-030588) e PES3N (2018-SAICT-45-2017-POCI-01-0145-FEDER-030629)
Частини книг з теми "Windowing-OFDM":
Pal, Ranjushree. "Effect of Windowing in the Performance of OFDM Systems." In Lecture Notes on Data Engineering and Communications Technologies, 247–54. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-8339-6_27.
Ahmed, Rana, Frank Schaich, and Thorsten Wild. "OFDM Enhancements for 5G Based on Filtering and Windowing." In Multiple Access Techniques for 5G Wireless Networks and Beyond, 39–61. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-92090-0_2.
Magesacher, Thomas. "Egress Reduction for OFDM Via Transmit Windowing — Framework and Comparison." In Lecture Notes in Electrical Engineering, 365–73. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2530-2_35.
Peiker, Eva, Werner G. Teich, and Jürgen Lindner. "Windowing in the Receiver for OFDM Systems in High-Mobility Scenarios." In Lecture Notes in Electrical Engineering, 57–65. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2530-2_6.
Тези доповідей конференцій з теми "Windowing-OFDM":
Arkhipov, Alexander. "Optimum equalizer for OFDM systems with windowing." In 2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications - (PIMRC 2009). IEEE, 2009. http://dx.doi.org/10.1109/pimrc.2009.5450323.
Chen, Guoguang, Rashid Ansari, and Yingwei Yao. "Improved Peak Windowing for PAPR Reduction in OFDM." In 2009 IEEE 69th Vehicular Technology Conference Spring. IEEE, 2009. http://dx.doi.org/10.1109/vetecs.2009.5073593.
Taheri, Tayebeh, Rickard Nilsson, and Jaap van de Beek. "Hybrid Spectral Precoding/Windowing for Low-Latency OFDM." In 2017 IEEE 85th Vehicular Technology Conference (VTC Spring). IEEE, 2017. http://dx.doi.org/10.1109/vtcspring.2017.8108399.
Khedkar, A. R., M. Murugan, and Ashwini A. Mate. "ICI cancellation using Raised Cosine windowing in OFDM system." In 2014 Annual IEEE India Conference (INDICON). IEEE, 2014. http://dx.doi.org/10.1109/indicon.2014.7030550.
Taheri, Tayebeh, Rickard Nilsson, and Jaap van de Beek. "Asymmetric Transmit-Windowing for Low-Latency and Robust OFDM." In 2016 IEEE Globecom Workshops (GC Wkshps). IEEE, 2016. http://dx.doi.org/10.1109/glocomw.2016.7848842.
Copeland, Andrew D., Daniel W. Bliss, and Andrew L. McKellips. "Optimal windowing in MIMO OFDM for network interference suppression." In 2009 Conference Record of the Forty-Third Asilomar Conference on Signals, Systems and Computers. IEEE, 2009. http://dx.doi.org/10.1109/acssc.2009.5469708.
Hui Xiaowei and Wang Qi. "Channel estimation technology based on windowing in OFDM system." In 2010 2nd International Conference on Networking and Digital Society (ICNDS). IEEE, 2010. http://dx.doi.org/10.1109/icnds.2010.5479472.
Maham, Behrouz, and Are Hjorungnes. "ICI Reduction in OFDM by using Maximally Flat Windowing." In 2007 IEEE International Conference on Signal Processing and Communications. IEEE, 2007. http://dx.doi.org/10.1109/icspc.2007.4728500.
An, Changyoung, Byeongjae Kim, and Heung-Gyoon Ryu. "WF-OFDM (windowing and filtering OFDM) system for the 5G new radio waveform." In 2017 IEEE XXIV International Conference on Electronics, Electrical Engineering and Computing (INTERCON). IEEE, 2017. http://dx.doi.org/10.1109/intercon.2017.8079635.
An, Changyoung, and Heung-Gyoon Ryu. "CPW-OFDM(Cyclic Postfix Windowing OFDM) for the B5G (Beyond 5th Generation) Waveform." In 2018 IEEE 10th Latin-American Conference on Communications (LATINCOM). IEEE, 2018. http://dx.doi.org/10.1109/latincom.2018.8613242.