Thèses sur le sujet « Frequency Selective Broadband Channels »
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Kosa, Irfan. « Performance of IEEE 802.11a wireless LAN standard over frequency-selective, slowly fading Nakagami channels in a pulsed jamming environment ». Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Dec%5FKosa.pdf.
Texte intégralThesis advisor(s): R. Clark Robertson, Tri Ha. Includes bibliographical references (p. 107-108). Also available online.
Bemani, Ali. « Affine Frequency Division Multiplexing (AFDM) for Wireless Communications ». Electronic Thesis or Diss., Sorbonne université, 2023. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2023SORUS610.pdf.
Texte intégralIn the realm of next-generation wireless systems (beyond 5G/6G), the vision is clear: to support a broad range of services and applications. This includes ensuring reliable communications in environments marked by high mobility, such as high-speed railway systems and various vehicular communications. Despite the deployment of various multicarrier techniques like orthogonal frequency division multiplexing (OFDM) and single-carrier frequency division multiple access (SC-FDMA) in standardized communication systems, the challenge persists. These techniques, while effective in time-invariant frequency selective channels, face performance degradation in high mobility scenarios due to the destruction of orthogonality among subcarriers caused by significant Doppler frequency shifts. Addressing this, the search for new, robust modulation techniques is paramount. It stands as a key area of investigation aiming to resolve the reliable communications issue for next-generation wireless networks within doubly-selective wireless channels. In this thesis, a novel solution, affine frequency division multiplexing (AFDM), is proposed. This new chirp-based multicarrier waveform is based on the discrete affine Fourier transform (DAFT), a variant of the discrete Fourier transform characterized with two parameters that can be adapted to better cope with doubly dispersive channels. This thesis provides a comprehensive investigation into the principles of AFDM within high mobility communications. It provides insight into the explicit input-output relation in the DAFT domain, unveiling the consequential impact of AFDM parameters. The manuscript details the precise setting of DAFT parameters, ensuring a full delay-Doppler representation of the channel. Through analytical demonstrations, it asserts that AFDM optimally achieves the diversity order in doubly dispersive channels due to its full delay-Doppler representation. The thesis also proposes two low-complexity detection algorithms for AFDM, taking advantage of its inherent channel sparsity. The first is a low complexity MMSE detector based on LDL factorization. The second is a low complexity iterative decision feedback equalizer (DFE) based on weighted maximal ratio combining (MRC) of the channel impaired input symbols received from different paths. Additionally, the thesis presents an embedded channel estimation strategy for AFDM systems, leveraging AFDM's ability to achieve full delay-Doppler representation of the channel. In this approach, an AFDM frame contains a pilot symbol and data symbols, with zero-padded symbols employed as guard intervals to prevent interference. A practical channel estimation algorithm based on an approximate maximum likelihood (ML) approach and compatible with this pilot scheme is also provided. The thesis concludes by delving into the expanded applications of AFDM, specifically in integrated sensing and communication (ISAC) and extremely high frequency (EHF) band communications. It is demonstrated that to identify all delay and Doppler components linked with the propagation medium, one can use either the full AFDM signal or only its pilot part consisting of one DAFT domain symbol and its guard interval. Furthermore, the chirp nature of AFDM allows for unique and simple self-interference cancellation with a single pilot, eliminating the need for costly full-duplex methods. The thesis also highlights AFDM's efficient performance in high-frequency bands (with or without mobility), where the maximal spreading of its signal in time and frequency ensures a coverage gain. Unlike other waveforms, AFDM not only provides maximal time-frequency spreading but also ensures robust and efficient detection, characterized by one-tap equalization and resilience to carrier frequency offset (CFO) and phase noise
Qin, Tianrui. « Over-the-air computation via broadband channels ». Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/26460.
Texte intégralEkinci, Umut Utku. « Code Aided Frame Synchronization For Frequency Selective Channels ». Thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/2/12611951/index.pdf.
Texte intégralChen, Xuan. « Adaptive equalization of frequency selective indoor wireless channels ». Thesis, University of Ottawa (Canada), 1995. http://hdl.handle.net/10393/10132.
Texte intégralSo, Daniel Ka Chun. « MIMO wireless communications in frequency selective fading channels / ». View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202003%20SO.
Texte intégralIncludes bibliographical references (leaves 136-144). Also available in electronic version. Access restricted to campus users.
Liu, Shoumin. « Soft-decision equalization techniques for frequency selective MIMO channels / ». Available online. Click here, 2005. http://sunshine.lib.mtu.edu/ETD/DISS/lius/Dissertation.pdf.
Texte intégralXu, Ying Lin 1975. « OFDMA schemes with diversity in frequency-selective fading channels ». Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81577.
Texte intégralThe research presented in this thesis aims to provide diversity in OFDMA for broadband wireless access communications in frequency-selective fading channels. First, the diversity characteristics in OFDMA are examined to establish the diversity equivalence in the time and frequency domains. Based on these characteristics, suitable techniques to achieve the full diversity gain in OFDMA are developed. When channel information is available to transmitters, a group-optimal adaptive-tone-diversity OFDMA (GO-ATD-OFDMA) scheme that combines adaptive diversity gain and bit loading, is proposed. It is shown that the GO-ATD-OFDMA can offer a better performance than the conventional time-domain Rake receiver. In the case of unavailable channel information, spreading is combined with diversity in the proposed group-spreading OFDMA (GS-OFDMA) scheme to provide both diversity protection and interference suppression. The GS-OFDMA has a comparable performance to the group-orthogonal multi-carrier code-division multiple-access (GO-MC-CDMA) scheme but with a reduced transmitted peak-to-average power ratio (PAR). Performance of the proposed schemes in terms of error rates, spectral efficiency, achievable system throughput, and computational complexity is investigated by analysis and simulations.
Davies, Martin. « Polynomial matrix decomposition techniques for frequency selective MIMO channels ». Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/6047.
Texte intégralLitchfield, Charan. « Single user diversity receivers for frequency selective WCDMA channels ». Thesis, University of Kent, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.443772.
Texte intégralAssimi, Abdel Nasser. « Diversity techniques for HARQ transmissions over frequency-selective channels ». Cergy-Pontoise, 2009. http://biblioweb.u-cergy.fr/theses/09CERG0428.pdf.
Texte intégralIn this thesis, we consider the problem of reliable data packets transmission using single-carrier signaling over frequency-selective fading channels. Our objective is to design enhanced transceivers with improved detection performance in the absence of channel state information at the transmitter by exploiting the available time-diversity in Chase combining Hybrid Automatic Repeat reQuest (HARQ) protocols. By analyzing the performance of the transmission scheme using an optimal maximum-likelihood receiver, we establish a suitable criterion for the study of system performance based on the statistics of the Euclidean distance at the output of a frequency-selective channel. From this theoretical framework, we propose a novel transmit-diversity scheme between subsequent HARQ transmissions, called phase-precoding, which allows the mitigation of intersymbol interference for slow time-varying channels. Then, with the help of our analytical tools, we revisit another transmit-diversity scheme which is the bit-interleaving diversity scheme. In particular, we emphasize the double advantage offered by this diversity scheme including the inherent modulation diversity in addition to the intersymbol interference reduction. Subsequently, we perform a comparative study between phase-precoding and bit-interleaving diversity schemes under iterative and non-iterative receiver structures. Finally, we introduce a new adaptive retransmission protocol for a multi-layer transmission scheme for the mitigation of inter-layers interference for rapidly time-varying channels using limited feedback information
Zhu, Xu. « Wireless MIMO antenna systems for frequency selective fading channels / ». View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202003%20ZHU.
Texte intégralIncludes bibliographical references (leaves 116-118). Also available in electronic version. Access restricted to campus users.
Liu, Yuan. « FREQUENCY DOMAIN INDEPENDENT COMPONENT ANALYSIS APPLIED TO WIRELESS COMMUNICATIONS OVER FREQUENCY-SELECTIVE CHANNELS ». Doctoral diss., University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3150.
Texte intégralPh.D.
Department of Electrical and Computer Engineering
Engineering and Computer Science
Electrical Engineering
Zheng, Jun. « Analysis of coded OFDM system over frequency-selective fading channels ». Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969.1/1137.
Texte intégralSzubbocsev, Zoltan. « The EM algorithm for frequency selective, quasi-static fading channels / ». Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=111503.
Texte intégral*This dissertation is a compound document (contains both a paper copy and a CD as part of the dissertation).
Count, Patrick A. « Performance analysis of OFDM in frequency selective, slowly fading Nakagami Channels ». Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2001. http://handle.dtic.mil/100.2/ADA401365.
Texte intégralThesis Advisor(s): Ha, Tri T. ; Robertson, R. Clark. "December 2001." Includes bibliographical references (p. 109-110). Also available in print.
Liu, Hong. « Frequency-domain equalization of single carrier transmissions over doubly selective channels ». Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1187064126.
Texte intégralChu, Alice Pin-Chen. « High-Rate Space-Time Block Codes in Frequency-Selective Fading Channels ». Thesis, University of Canterbury. Electrical and Computer Engineering, 2012. http://hdl.handle.net/10092/10360.
Texte intégralSong, Hui. « On statistical characterization of EESM effective SNR over frequency selective channels ». Thesis, University of Bedfordshire, 2010. http://hdl.handle.net/10547/135260.
Texte intégralAhmed, Alaa Hussain. « Physical layer network coding based communication systems in frequency selective channels ». Thesis, University of Newcastle upon Tyne, 2017. http://hdl.handle.net/10443/3871.
Texte intégralViteri, Mera Carlos Andres. « Beamforming Techniques for Frequency-Selective and Millimeter-Wave Indoor Broadcast Channels ». The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu152344603415358.
Texte intégralLe, Bidan Raphaël. « Turbo-equalization for bandwidth-efficient digital communications over frequency-selective channels ». Rennes, INSA, 2003. http://www.theses.fr/2003ISAR0012.
Texte intégralRattray, George G. K. « Joint diversity trellis-coded modulation for frequency selective environments ». Thesis, University of Sussex, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366060.
Texte intégralKatayama, Masaaki. « Keynote : “Power line channels : frequency and time selective” Part 2.-Noise statistics of indoor PLC channels ». IEEE, 2007. http://hdl.handle.net/2237/9424.
Texte intégralSUGAHARA, TOMIE. « DETECTION OF TRELLIS-COBE MODULATED SIGNAL IN FREQUENCY NON-SELECTIVE FADING CHANNELS ». PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1997. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8513@1.
Texte intégralEste trabalho examina uma nova estratégia para detenção de Sinais TCM em presença de desvanecimento não-seletivo em freqüência. Esta estratégia faz uso de um conjunto de estimativas da distorção do canal, cada uma associada a um estado da treliça de decodificação, que são utilizadas simultaneamente no processo de decodificação. No método proposto, a cada intervalo de símbolo calcula-se uma estimativa de canal para cada percurso sobrevivente, usando os sinais associados a este percurso como decisões dos sinais transmitidos até então, juntamente com um algoritmo do tipo Filtro de Kalman. O método é descrito inicialmente para uso em sistemas sem intercalação- desintercalação. Uma versão modificada é proposta para permitir o uso da nova estratégia em associação com esquemas de intercalação-desintercalação. Resultados de desempenho obtidos, via simulação, com os métodos propostos são comparados com os resultados obtidos supondo- se o conhecimento ideal das distorções introduzidas pelo canal bem como os resultados apresentados na literatura, referentes a outros métodos de deteção.
We look into a new strategy for detecting trellis-code modulated signal in the presence of frequency non- selective fading which makes simultaneous use in the decoding procedure of a set of channel distortion estimates, each one associated to a trellis state. During each symbol interval, based on a Kalman Filter-type algorithm, a distinct channel estimate is recursively generated for each survivor path using this path symbols as the truly transmitted symbols. A method is first proposed for use in non-interleaved systems. A modified version for interleaved systems. A modified version for interleaved systens is then presented. Performances are evaluated by computer simulations and comparisons mede to curves pertaining to other methods in the literature and to curves obteined under ideal channel state information assumption.
Aktas, Emre. « Channel estimation and equalization for wireless communication systems in frequency selective channels / ». The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486546889382902.
Texte intégralIyer, Karthik S. « Iterative equalization and decoding for modified D-BLAST in frequency selective MIMO channels ». Ann Arbor, Mich. : ProQuest, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1432940.
Texte intégralTitle from PDF title page (viewed July 9, 2007). Source: Masters Abstracts International, Volume: 44-04, page: 1928. Adviser: Dinesh Rajan. Includes bibliographical references.
Tung, Tai-Lai, Kung Yao et Don Whiteman. « MULTIPLE-ANTENNA SPATIO-TEMPORAL PROCESSING FOR OFDM COMMUNICATIONS OVER FREQUENCY-SELECTIVE FADING CHANNELS ». International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/606486.
Texte intégralIn this paper, we propose applying the spatio-temporal signal processing and OFDM techniques to a multiple-antenna system in order to achieve high data rate and high performance transmission capability. In order to perform real time processing for this system, we also propose a complexity reduced QR beamforming algorithm. The performance of the proposed system has been investigated for a two-ray frequency-selective fading model by extensive computer simulations. These results show that significant benefits can be realized in terms of lower bit error rate and higher data transmission rate.
Gao, Wei, Shih-Ho Wang et Kamilo Feher. « BLIND EQUALIZATION FOR FQPSK AND FQAM SYSTEMS IN MULTIPATH FREQUENCY SELECTIVE FADING CHANNELS ». International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/607298.
Texte intégralBlind adaptive equalization with application for Non-Linearly Amplified (NLA) quadrature amplitude modulation (QAM) systems in multipath selective fading channels is presented. With an offset sampling strategy in the receiver, the proposed blind equalization using Constant Modulus Algorithm (CMA) exhibits a fast convergent speed for a family of quadrature modulated systems in NLA and multipath fading channels. Feher’s patented Quadrature Phase Shift Keying (FQPSK) and Feher’s Quadrature Amplitude Modulation (FQAM) which correspond respectively to 4-state and 16-state QAM are used due to their higher Radio Frequency (RF) power and spectral efficiency in NLA channel. It has been shown that blind adaptive equalization can significantly open the eye signals in multipath frequency selective fading channels.
Eddaghel, Masoud. « Mitigating PAPR in cooperative wireless networks with frequency selective channels and relay selection ». Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/16339.
Texte intégralPham, Edward Carleton University Dissertation Engineering Electrical. « SER prediction for transmission of PSAM 16-QAM in frequency selective fading channels ». Ottawa, 1992.
Trouver le texte intégralSong, Liying Tugnait Jitendra K. « Channel estimation and equalization for doubly-selective channels using basis expansion models ». Auburn, Ala, 2008. http://repo.lib.auburn.edu/EtdRoot/2008/SPRING/Electrical_and_Computer_Engineering/Dissertation/Song_Liying_29.pdf.
Texte intégralD'Amours, Claude. « Differential and coherent RAKE receivers for DS-CDMA in frequency-selective Rayleigh fading channels ». Thesis, University of Ottawa (Canada), 1992. http://hdl.handle.net/10393/10753.
Texte intégralKao, Chi-Han. « Performance of IEEE 802.11a wireless LAN standard over frequency-selective, slow, ricean fading channels ». Thesis, Monterey California. Naval Postgraduate School, 2002. http://hdl.handle.net/10945/5020.
Texte intégralWith the rapidly growing demand for more reliable and higher data rate wireless communications, the Institute of the Electrical and Electronics Engineers (IEEE) 802.11 working group approved a standard for 5 GHz band, wireless local area networks (WLAN) in 1999. This standard, IEEE 802.11a, supports data rates from 6 up to 54 Mbps, and uses orthogonal frequency division multiplexing (OFDM) for transmission in indoor wireless environments. This thesis examines the performance of the IEEE 802.11a standard for different combinations of sub-carrier modulation type and code rate and determines the signal-to-noise ratio required to obtain a probability of bit error b P of 10-5. The channel is modeled as a frequency-selective, slow, Ricean fading channel with additive white Gaussian noise (AWGN). Contrary to expectations, for the combinations of sub-carrier modulation type and code rate utilized by the IEEE 802.11a standard, some of the higher data rate combinations outperform some of the lower data rate combinations. On the other hand, the results also show significant coding gain when applying convolutional coding with Viterbi decoding, and hence highlight the importance of forward error correction (FEC) coding to the performance of wireless communications systems.
Rice, Michael, Gaston David de, Adam Davis, Gus German et Christian Bettwieser. « ARTM CHANNEL SOUNDING RESULTS – AN INVESTIGATION OF FREQUENCY SELECTIVE FADING ON AERONAUTICAL TELEMETRY CHANNELS ». International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/608746.
Texte intégralInitial results of wideband channel sounding experiments sponsored by the Advanced Range Telemetry (ARTM) program are presented. Data collected at Edwards EAFB during the Winter 1998-1999, are analyzed in the frequency domain to estimate the number, strength, and delays of the significant multipath reflections observed during the experiments. We observe that the channel is adequately modeled using two or three multipath reflections. The multipath fade events are correlated with recorded bit error rates and transmitter location to provide a comprehensive overview of the channel characteristics. Summaries from two test flights are included where it is seen that the 2- and 3-ray channel models provide excellent models for the data. In general, the 3-ray model captures the essential features of the multipath interference. In this model the first multipath is a strong specular reflection with relative amplitude greater than 0.5 and relative delay in the 30 to 70 ns range. The second multipath is a much weaker reflection with relative amplitude less than 0.5 and relative delay in the 175 to 325 ns range.
Kao, Chi-han. « Performance of IEEE 802.11a wireless LAN standard over frequency-selective, slow, ricean fading channels / ». Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02sep%5FKao.pdf.
Texte intégralThesis advisor(s): R. Clark Robertson, Roberto Cristi. Includes bibliographical references (p. 93-94). Also available online.
Wavegedara, Kapila Chandika B. « Advanced receivers for space-time block-coded single-carrier transmissions over frequency-selective fading channels ». Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/620.
Texte intégralPham, Tri. « Soft Detection of Trellis Coded CPM in Frequency-SelectiveChannels ». Thesis, University of Canterbury. Electrical and Electronic Engineering, 2012. http://hdl.handle.net/10092/7178.
Texte intégralLiang, Yan. « Integrated Frequency-Selective Conduction Transmission-Line EMI Filter ». Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/26360.
Texte intégralPh. D.
Gong, Yi. « Space-time coding for high data-rate wireless communications over space and frequency selective fading channels / ». View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202002%20GONG.
Texte intégralIncludes bibliographical references (leaves 105-114). Also available in electronic version. Access restricted to campus users.
Manglani, Manish. « Wavelet Modulation in Gaussian and Rayleigh Fading Channels ». Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/34396.
Texte intégralMaster of Science
Siyau, Ming Fei. « A novel training-based MIMO channel estimation scheme for layered space-time systems in frequency selective wireless channels ». Thesis, Cranfield University, 2009. http://dspace.lib.cranfield.ac.uk/handle/1826/3464.
Texte intégralLI, XIANGTAO. « PERFORMANCE ANALYSIS OF DECORRELATING DETECTORS FOR DUAL-RATE SYNCHRONOUS DS/CDMA SYSTEMS OVER FREQUENCY-SELECTIVE RAYLEIGH FADING CHANNELS ». University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1028644891.
Texte intégralSiyau, M. F. « A Novel training-based MIMO channel estimation scheme for layered space-time systems in frequency selective wireless channels ». Thesis, Department of Aerospace, Power & ; Sensors, 2009. http://hdl.handle.net/1826/3464.
Texte intégralChi, Xuan. « The Impact of Channel Estimation Error on Space-Time Block and Trellis Codes in Flat and Frequency Selective Channels ». Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/33963.
Texte intégralBoth techniques provide a means for combatting the effects of multipath fading without adding much complexity to the receiver. This is especially useful in the downlink of wireless systems. In this thesis we investigate the impact of channel estimation error on the performance of both STBC and STTC.
Channel estimation is especially important to consider in multiple antenna systems since (A) for coherent systems there are more channels to estimate due to multiple antennas and (B) the decoupling of data streams relies on correct channel estimation. The latter effect is due to the intentional cross-talk introduced into STBC.
Master of Science
Fhima, Hayfa. « Study and implementation of widely linear (WL) receiver for filter bank based multicarrier (FBMC-OQAM) modulations over frequency selective channels ». Electronic Thesis or Diss., Paris, CNAM, 2019. http://www.theses.fr/2019CNAM1266.
Texte intégralThe increasing demand of user’s requirements is one of the main reasons in technical progress and development of modern wireless communication systems. Thus, since 2G and beyond, there have been many changes, especially, the switch from the mono carrier to the multi-carrier (MC), introduced for the Down-Link (DL) 4G transmission. Indeed, the predo- minant idea behind introducing MC waveforms (WF) is to get rid of the propagation channel effects, by relaxing the equalization process through the transmission of the data symbols over flat fading sub-channels or sub-carriers. Furthermore, the widely adopted MC WF is the ortho- gonal frequency division multiplexing (OFDM), which became very popular and widely used in many wireless standards like long term evolution (LTE)- Advanced (LTE-A) andWi-Fi. The standardization of OFDM, for these applications and also for some others, is related to the ad- vantages shown by this MC WF. One of these advantages is its simple implementation through the use of the inverse fast Fourier transform (IFFT) at the transmitter side, and a FFT at the receiver side. Also, OFDM introduces a cyclic prefix (CP), making the transmission free from inter-symbol-interference (ISI).Despite the large success of the OFDM WF, this technique suffers from the loss of spec- tral efficiency due to the use of the CP. Besides, it suffers from bad frequency localization due the use of a rectangular prototype filter. These OFDM drawbacks, have motivated researchers to design new MC WF, with better frequency domain localization, better robustness to user’s synchronism, while keeping moderate implementation complexity. In this context, high num- ber of post-OFDM MC WF have been proposed and implemented to meet 5G scenarios and requirements in a flexible manner.Therefore, the offset-quadratureamplitudemodulation-based filter-bankmulti-carrier(FBMC- OQAM) has been proposed as an alternative to overcome some drawbacks of the OFDM WF. Indeed, FBMC-OQAM is characterized by owning one of the best frequency localiza- tion among all the post-OFDM WFs, thanks to its prototype filter (Phydyas), providing then the best performance in supporting asynchronous and mixed numerologies transmissions. Be- sides, it offers high spectrum efficiency since it avoids the use of CP and large guard bands. Furthermore, the orthogonality in real domain is guaranteed thanks to the use of the OQAM modulation. However, this orthogonality is lost under frequency selective channels which re- quires advanced equalization techniques.In this context, the main objective of this thesis is to study different types of equalization applied on FBMC-OQAM system. Since the modulation used in the FBMC-OQAM system can be seen as the transmission of two M−PAM modulations over one single carrier and since the widely linear processing outperforms the classical one for M−PAM modulation, we will focus on the advantages of using the widely linear processing over FBMC-OQAM system. Ad- ditionally, and based on the cyclo-stationarity of the FBMC-OQAM signal, we have proposed an advanced equalization structure based on FRESH processing that have been applied in to a FBMC-OQAM system using different numerologies
Franklin, Daniel Robert. « Enhancements to channel models, DMT modulation and coding for channels subject to impulsive noise ». School of Electrical, Computer & ; Telecommunications Engineering - Faculty of Informatics, 2007. http://ro.uow.edu.au/theses/18.
Texte intégralKalogrias, Christos. « Performance analysis of the IEEE 802.11A WLAN standard optimum and sub-optimum receiver in frequency-selective, slowly fading Nakagami channels with AWGN and pulsed noise jamming ». Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Mar%5FKalogrias.pdf.
Texte intégralThesis advisor(s): Clark Robertson. Includes bibliographical references (p. 143). Also available online.
Fung, Victor. « Bit error simulation of FSK, BPSK, and pi/4 DQPSK in flat and frequency-selective fading mobile radio channels using two-ray and measurement- based impulse response models ». Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-08142009-040410/.
Texte intégralOsman, Ammar. « Low-complexity OFDM transceiver design for UMTS-LTE ». Thesis, Blekinge Tekniska Högskola, Avdelningen för signalbehandling, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3716.
Texte intégralTel: +46-704469795 Email: osman@ftw.at,amos04@student.bth.se, ammarmao@gmail.com