Rozprawy doktorskie na temat „Iterative receiver”
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Nguyen, Xuan Huan Electrical Engineering & Telecommunications Faculty of Engineering UNSW. "OFDM receiver design with iterative techniques". Awarded by:University of New South Wales. School of Electrical Engineering and Telecommunications, 2006. http://handle.unsw.edu.au/1959.4/26776.
Pełny tekst źródłaSchmitt, Lars. "On iterative receiver algorithms for concatenated codes /". Aachen : Shaker, 2008. http://d-nb.info/98808757X/04.
Pełny tekst źródłaMathur, Avinash. "Iterative LDPC CDMA receiver with EM estimation". Thesis, Wichita State University, 2007. http://hdl.handle.net/10057/1547.
Pełny tekst źródłaThesis (M.S.)--Wichita State University, College of Engineering, Dept. of Electrical and Computer Engineering
"July 2007."
Mathur, Avinash Kwon Hyuck M. "Iterative LDPC CDMA receiver with EM estimation /". Thesis, A link to full text of this thesis in SOAR, 2007. http://hdl.handle.net/10057/1547.
Pełny tekst źródłaSun, Kyung Tae (John) Electrical Engineering & Telecommunications Faculty of Engineering UNSW. "Selective detection in an iterative soft interference cancellation receiver". Awarded by:University of New South Wales. School of Electrical Engineering and Telecommunications, 2006. http://handle.unsw.edu.au/1959.4/35224.
Pełny tekst źródłaSchmitt, Lars [Verfasser]. "On Iterative Receiver Algorithms for Concatenated Codes / Lars Schmitt". Aachen : Shaker, 2008. http://d-nb.info/1161312811/34.
Pełny tekst źródłaTervo, V. (Valtteri). "Joint multiuser power allocation and iterative multi-antenna receiver design". Doctoral thesis, Oulun yliopisto, 2015. http://urn.fi/urn:isbn:9789526207292.
Pełny tekst źródłaTiivistelmä Väitöskirjassa tutkitaan lähettimessä tapahtuvan tehoallokoinnin sekä vastaanottimessa tapahtuvan signaalin suodatuksen yhteisoptimointia monikäyttöön suunnatussa langattomassa moniantennikommunikaatiossa. Langattomien laitteiden lukumäärän kasvaessa energiatehokkuuden merkitys tiedonsiirtolinkkien suunnittelussa korostuu. Soluihin perustuvassa langattomassa tietoliikenteessä keskimääräisen tehonkulutuksen pienentäminen ylälinkkilähetyksessä (käyttäjältä tukiasemaan) on tärkeää käyttäjän kannalta, sillä se pidentää laitteen akun kestoa. Lähettimen tehovahvistimen (high power amplifier (HPA)) tehonkulutus on kuitenkin verrannollinen lähetyksen huipputehoon. Väitöskirjassa luodaaan uusia menetelmiä sekä vertaillaan tehoallokointia yhden kantoaallon taajuustason monikäyttöön (single carrier frequency division multiple access (SC-FDMA)) ja ortogonaalisen taajuustason monikäyttöön (orthogonal FDMA (OFDMA)) perustuvissa lähetysteknologioissa. Työn ensimmäisessä osiossa tavoitteena on keskimääräisen tehonkulutuksen pienentäminen monen käyttäjän ylälinkkikommunikaatiossa suunnittelemalla tehoallokointimenetelmä, joka ottaa huomioon iteratiivisen vastaanottimen konvergenssiominaisuudet. Työssä ehdotettu menetelmä takaa vastaanotetun informaation halutun laadun (quality of service (QoS)) riittävän monen vastaanottimessa tehdyn iteraation jälkeen. Huipputehon ja keskitehon suhteen (peak to average power ratio (PAPR)) pienentäminen missä tahansa lähetyksessä on hyödyllistä, sillä sen ansiosta voidaan käyttää energiatehokkaampia ja halvempia tehovahvistimia. Työn jälkimmäisessä osiossa tavoitteena on kontrolloida lähetetyn signaalin huipputehon ja keskitehon suhdetta. Työn ensimmäisessä osiossa esitetyn QoS-rajoitteen lisäksi tehoallokointia rajoitetaan symbolisekvenssikohtaisella PAPR-rajoitteella SCFDMA- ja OFDMA-lähetyksessä. Lisäksi esitetään tilastollinen menetelmä, jossa rajoitetaan lähetetyn signaalin tehon varianssia. Kun käytetään yhtäaikaisesti QoS- ja PAPR-rajoitteita, voidaan tiedonsiirtokanavaan suunnitella optimaalinen tehoallokointi ottaen huomioon tehovahvistimen epälineaarisuudet. Työssä esitetty PAPR-rajoite on kuitenkin geneerinen, ja se voidaan sovittaa mihin tahansa SCFDMA- tai OFDMA- optimointikehykseen. Työssä esitettävien optimointiongelmien tavoitteena on käyttäjien summatehon minimointi. Suurin osa työssä esiintyvistä ongelmista on ei-konvekseja, joten siinä esitetään kaksi vaihtoehtoista peräkkäinen konveksi approksimaatio (successive convex approximation (SCA)) -menetelmää kaikille ei-konvekseille rajoitteille. Numeeriset tulokset osoittavat, että esitetyt tehoallokointimenetelmät pienentävät merkittävästi keskimääräistä tehonkulutusta mahdollistaen lisäksi adaptiivisen PAPR-kontrolloinnin. Väitöskirjassa esitettyjen menetelmien avulla voidaan pidentää mobiilikäyttäjien akun kestoa sekä erityisesti parantaa solun reunakäyttäjien palvelun laatua
Lillie, Andrew G. "Iterative receiver techniques for high data rate indoor wireless communication systems". Thesis, University of Bristol, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419135.
Pełny tekst źródłaOzgur, Soner. "Reduced Complexity Sequential Monte Carlo Algorithms for Blind Receivers". Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10518.
Pełny tekst źródłaFonseca, dos Santos André. "Efficient receiver methods for coded systems under channel uncertainty". Dresden Vogt, 2010. http://d-nb.info/1001706269/04.
Pełny tekst źródłaLi, Rui. "Iterative Receiver for MIMO-OFDM System with ICI Cancellation and Channel Estimation". Thesis, The University of Sydney, 2008. http://hdl.handle.net/2123/3544.
Pełny tekst źródłaLi, Rui. "Iterative Receiver for MIMO-OFDM System with ICI Cancellation and Channel Estimation". University of Sydney, 2008. http://hdl.handle.net/2123/3544.
Pełny tekst źródłaAs a multi-carrier modulation scheme, Orthogonal Frequency Division Multiplexing (OFDM) technique can achieve high data rate in frequency-selective fading channels by splitting a broadband signal into a number of narrowband signals over a number of subcarriers, where each subcarrier is more robust to multipath. The wireless communication system with multiple antennas at both the transmitter and receiver, known as multiple-input multiple-output (MIMO) system, achieves high capacity by transmitting independent information over different antennas simultaneously. The combination of OFDM with multiple antennas has been considered as one of most promising techniques for future wireless communication systems. The challenge in the detection of a space-time signal is to design a low-complexity detector, which can efficiently remove interference resulted from channel variations and approach the interference-free bound. The application of iterative parallel interference canceller (PIC) with joint detection and decoding has been a promising approach. However, the decision statistics of a linear PIC is biased toward the decision boundary after the first cancellation stage. In this thesis, we employ an iterative receiver with a decoder metric, which considerably reduces the bias effect in the second iteration, which is critical for the performance of the iterative algorithm. Channel state information is required in a MIMO-OFDM system signal detection at the receiver. Its accuracy directly affects the overall performance of MIMO-OFDM systems. In order to estimate the channel in high-delay-spread environments, pilot symbols should be inserted among subcarriers before transmission. To estimate the channel over all the subcarriers, various types of interpolators can be used. In this thesis, a linear interpolator and a trigonometric interpolator are compared. Then we propose a new interpolator called the multi-tap method, which has a much better system performance. In MIMO-OFDM systems, the time-varying fading channels can destroy the orthogonality of subcarriers. This causes serious intercarrier interference (ICI), thus leading to significant system performance degradation, which becomes more severe as the normalized Doppler frequency increases. In this thesis, we propose a low-complexity iterative receiver with joint frequency- domain ICI cancellation and pilot-assisted channel estimation to minimize the effect of time-varying fading channels. At the first stage of receiver, the interference between adjacent subcarriers is subtracted from received OFDM symbols. The parallel interference cancellation detection with decision statistics combining (DSC) is then performed to suppress the interference from other antennas. By restricting the interference to a limited number of neighboring subcarriers, the computational complexity of the proposed receiver can be significantly reduced. In order to construct the time variant channel matrix in the frequency domain, channel estimation is required. However, an accurate estimation requiring complete knowledge of channel time variations for each block, cannot be obtained. For time- varying frequency-selective fading channels, the placement of pilot tones also has a significant impact on the quality of the channel estimates. Under the assumption that channel variations can be approximated by a linear model, we can derive channel state information (CSI) in the frequency domain and estimate time-domain channel parameters. In this thesis, an iterative low-complexity channel estimation method is proposed to improve the system performance. Pilot symbols are inserted in the transmitted OFDM symbols to mitigate the effect of ICI and the channel estimates are used to update the results of both the frequency domain equalizer and the PICDSC detector in each iteration. The complexity of this algorithm can be reduced because the matrices are precalculated and stored in the receiver when the placement of pilots symbols is fixed in OFDM symbols before transmission. Finally, simulation results show that the proposed MIMO-OFDM iterative receiver can effectively mitigate the effect of ICI and approach the ICI-free performance over time-varying frequency-selective fading channels.
Shepherd, David Peter, i RSISE [sic]. "Optimisation of Iterative Multi-user Receivers using Analytical Tools". The Australian National University. Research School of Information Sciences and Engineering, 2008. http://thesis.anu.edu.au./public/adt-ANU20081114.221408.
Pełny tekst źródłaMilliner, David Louis 1981. "A low-complexity linear and iterative receiver architecture for multi-antenna communication systems". Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28448.
Pełny tekst źródłaVita.
Includes bibliographical references (leaves 60-62).
Multi-antenna systems have been shown to significantly improve channel capacity in wireless environments. The focus of this thesis is on the design of low-complexity multi-antenna receiver architectures for communication networks and their demonstration in a real-time wireless environment. Our practical realization of an orthogonal frequency-division multi-antenna receiver is capable of several forms of linear and iterative detection. Our implementation is based on a division-free reformulation of standard minimum mean-squared-error detection algorithms and uses complex dot-products as the basic building blocks of a folded-pipelined architecture. This folded-pipelined architecture provides significant area savings over non-folded approaches. The demonstration of our receiver architecture is carried out on a rapid-prototyping FPGA communication system. This prototype is used to validate our design and complement theoretical and simulated results with real-time laboratory measurements in a typical office environment.
by David Louis Milliner.
M.Eng.
Bagdiya, Anshul P. "Iterative receiver for flip orthogonal frequency division multiplexing and proposed 5G modulation techniques". Thesis, California State University, Long Beach, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10251768.
Pełny tekst źródłaIn Optical Wireless Communication (OWC) systems, the technique of Flip-Orthogonal Frequency Division Multiplexing (Flip-OFDM) is applied, where the positive segment and negative segment of the signal are transmitted on two continuous OFDM sub-frames. Conventionally in Flip-OFDM, data is recovered by simply subtracting the negative sub-frame from the positive sub-frame. But the signal survey confirms that the information in both sub-frames gets disrupted during signal propagation and an incorrect detection of the received values takes place at the detector.
An iterative receiver is proposed that utilizes the input signal values along with the received signals sub-frames to improve the efficacy of the Flip-OFDM. The Matlab software is used to design the transmitter and iterative receiver. Features such as cyclic prefixing, frame multiplexing, and channel characterization are included in the design.
The results of the simulation depict that the suggested receiver delivers a superior Bit Error Rate (BER) and Signal to Noise Ratio (SNR) gain when compared to the conservative receiver.
Mohd, Tadza Noor Zahrinah Binti. "Energy efficient design of an adaptive switching algorithm for the iterative-MIMO receiver". Thesis, University of Edinburgh, 2015. http://hdl.handle.net/1842/11711.
Pełny tekst źródłaTeekapakvisit, Chakree. "Low Complexity Adaptive Iterative Receivers for Layered Space-Time Coded and CDMA Systems". University of Sydney, 2007. http://hdl.handle.net/2123/1776.
Pełny tekst źródłaIn this thesis, we propose and investigate promising approaches for interference mitigation in multiple input multiple output (MIMO) and code division multiple access (CDMA) systems. Future wireless communication systems will have to achieve high spectral efficiencies in order to meet increasing demands for huge data rates in emerging Internet and multimedia services. Multiuser detection and space diversity techniques are the main principles, which enable efficient use of the available spectrum. The main limitation for the applicability of the techniques in these practical systems is the high complexity of the optimal receiver structures. The research emphasis in this thesis is on the design of a low complexity interference suppression/cancellation algorithm. The most important result of our research is the novel design of interference cancellation receivers which are adaptive and iterative and which are of low computational complexity. We propose various adaptive iterative receivers, based on a joint adaptive iterative detection and decoding algorithm. The proposed receiver can effectively suppress and cancel co-channel interference from the adjacent antennas in the MIMO system with a low computation complexity. The proposed adaptive detector, based on the adaptive least mean square (LMS) algorithm, is investigated and compared with the non-adaptive iterative receiver. Since the LMS algorithm has a slow convergence speed, a partially filtered gradient LMS (PFGLMS) algorithm, which has a faster convergence speed, is proposed to improve the convergence speed of the system. The performance and computational complexity of this receiver are also considered. To further reduce the computational complexity, we apply a frequency domain adaptation technique into the adaptive iterative receivers. The system performance and complexity are investigated. It shows that the computational complexity of the frequency domain based receiver is significantly lower than that of the time domain based receiver with the same system performance. We also consider applications of MIMO techniques in CDMA systems, called MIMO-CDMA. In the MIMO-CDMA, the presence of the co-channel interference (CCI) from the adjacent antennas and multiple access interference (MAI) from other users significantly degrades the system performance. We propose an adaptive iterative receiver, which provides the capability to effectively suppress the interference and cancel the CCI from the adjacent antennas and the MAI from other users so as to improve the system performance. The proposed receiver structure is also based on a joint adaptive detection and decoding scheme. The adaptive detection scheme employs an adaptive normalized LMS algorithm operating in the time and frequency domain. We have investigated and compared their system performance and complexity. Moreover, the system performance is evaluated by using a semi-analytical approach and compared with the simulation results. The results show that there is an excellent agreement between the two approaches.
Teekapakvisit, Chakree. "Low Complexity Adaptive Iterative Receivers for Layered Space-Time Coded and CDMA Systems". Thesis, The University of Sydney, 2006. http://hdl.handle.net/2123/1776.
Pełny tekst źródłaYlioinas, J. (Jari). "Iterative detection, decoding, and channel estimation in MIMO-OFDM". Doctoral thesis, University of Oulu, 2010. http://urn.fi/urn:isbn:9789514262203.
Pełny tekst źródłaBijukchhe, Neelu. "Iterative EM channel estimation for turbo-coded DS CDMA receiver under different communication scenarios". Thesis, Wichita State University, 2008. http://hdl.handle.net/10057/1972.
Pełny tekst źródłaThesis (M.S) - Wichita State University, College of Engineering, Dept. of Electrical and Computer Engineering
Bijukchhe, Neelu Kwon Hyuck M. "Iterative EM channel estimation for turbo-coded DS CDMA receiver under different communication scenarios". A link to full text of this thesis in SOAR, 2008. http://hdl.handle.net/10057/1972.
Pełny tekst źródłaSahin, Mustafa. "Baseband receiver algorithms for 4G co-channel femtocells". [Tampa, Fla] : University of South Florida, 2009. http://purl.fcla.edu/usf/dc/et/SFE0003283.
Pełny tekst źródłaLaw, Tung-man. "An iterative receiver with pilot-aided Kalman filter based channel estimation for wireless MC-CDMA communication systems". Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B38581668.
Pełny tekst źródłaLaw, Tung-man, i 羅東文. "An iterative receiver with pilot-aided Kalman filter based channel estimation for wireless MC-CDMA communication systems". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B38581668.
Pełny tekst źródłaTseng, Hsin-Wu, Jiahua Fan i Matthew A. Kupinski. "Assessing computed tomography image quality for combined detection and estimation tasks". SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS, 2017. http://hdl.handle.net/10150/626451.
Pełny tekst źródłaNing, Baozhu. "Performance Analysis of Iterative Soft Interference Cancellation Algorithms and New Link Adaptation Strategies for Coded MIMO Systems". Thesis, Supélec, 2013. http://www.theses.fr/2013SUPL0034/document.
Pełny tekst źródłaCurrent wireless communication systems evolve toward an enhanced reactivity of Radio Resource Management (RRM) and Fast Link Adaptation (FLA) protocols in order to jointly optimize the Media Access Control (MAC) and Physical (PHY) layers. In parallel, multiple antenna technology and advanced turbo receivers have a large potential to increase the spectral efficiency of future wireless communication system. These two trends, namely, cross layer optimization and turbo processing, call for the development of new PHY-layer abstractions (also called performance prediction method) that can capture the iterative receiver performance per iteration to enable the smooth introduction of such advanced receivers within FLA and RRM. The PhD thesis first revisits in detail the architecture of the turbo receiver, more particularly, the class of iterative Linear Minimum Mean-Square Error (soft) Interference Cancellation (LMMSE-IC) algorithms. Then, a semi-analytical performance prediction method is proposed to analyze its evolution through the stochastic modeling of each of the components. Intrinsically, the performance prediction method is conditional on the available Channel State Information at Receiver (CSIR), the type of channel coding (convolutional code or turbo code), the number of codewords and the type of Log Likelihood Ratios (LLR) on coded bits fed back from the decoder for interference reconstruction and cancellation inside the iterative LMMSE-IC algorithms. In the second part, closed-loop FLA in coded MIMO systems based on the proposed PHY-layer abstractions for iterative LMMSE-IC receiver have been tackled. The proposed link adaptation scheme relies on a low rate feedback and operates joint spatial precoder selection (e.g., antenna selection) and Modulation and Coding Scheme (MCS) selection so as to maximize the average rate subject to a target block error rate constraint. The cross antenna coding (the transmitter employs a Space-Time Bit-Interleaved Coded Modulation (STBICM) ) and per antenna coding (Each antenna employs an independent Bit-Interleaved Coded Modulation(BICM)) cases are both considered. The simulations clearly show the significant gain obtained with turbo receivers compared to that of a conventional MMSE receiver
Luna, Rivera José M. "Iterative multiuser receivers for coded DS-CDMA systems". Thesis, University of Edinburgh, 2003. http://hdl.handle.net/1842/1382.
Pełny tekst źródłaJakubisin, Daniel Joseph. "Advances in Iterative Probabilistic Processing for Communication Receivers". Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/71640.
Pełny tekst źródłaPh. D.
Shepherd, David. "Optimisation of iterative multi-user receivers using analytical tools /". View thesis entry in Australian Digital Theses Program, 2008. http://thesis.anu.edu.au/public/adt-ANU20081114.221408/index.html.
Pełny tekst źródłaNissilä, M. (Mauri). "Iterative receivers for digital communications via variational inference and estimation". Doctoral thesis, University of Oulu, 2008. http://urn.fi/urn:isbn:9789514286865.
Pełny tekst źródłaVeselinovic, N. (Nenad). "Iterative receivers for interference cancellation and suppression in wireless communications". Doctoral thesis, University of Oulu, 2004. http://urn.fi/urn:isbn:9514275977.
Pełny tekst źródłaLiu, Hui. "Iterative receivers for OFDM systems with dispersive fading and frequency offset". Thesis, [College Station, Tex. : Texas A&M University, 2004. http://hdl.handle.net/1969.1/284.
Pełny tekst źródła"Major Subject: Electrical Engineering" Title from author supplied metadata (automated record created on Jul. 18, 2005.) Vita. Abstract. Includes bibliographical references.
Zhou, Jiahuai. "Iterative map and Apri-SOVA receivers for the frequency-selective Rayleigh fading channel". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0001/MQ32293.pdf.
Pełny tekst źródłaLi, Yim Cheung. "Comparison of iterative MAP and SOVA receivers for the frequency non-selective fading channel". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0003/MQ45085.pdf.
Pełny tekst źródłaNhan, Nhat-Quang. "Optimisation de précodeurs linéaires pour les systèmes MIMO à récepteurs itératifs". Thesis, Brest, 2016. http://www.theses.fr/2016BRES0062/document.
Pełny tekst źródłaThe long-term evolution (LTE) and the LTE-Advanced (LTE-A) standardizations are predicted to play essential roles in the future fifth-generation (5G) mobile networks. These standardizations require high data rate and high quality of service, which assures low error-rate and low latency. Besides, as discussed in the recent surveys, low complexity communication systems are also essential in the next 5G mobile networks. To adapt to the modern trend of technology, in this PhD thesis, we investigate the multiple-input multiple-output (MIMO) wireless communication schemes. In the first part of this thesis, low-complex forward error correction (FEC) codes are used for low complexity and latency. By considering iterative receivers at the receiver side, we exploit MIMO linear precoding and mapping methods to optimize the error-rate performance of these systems. In the second part of this thesis, non-binary low density parity check (NB-LDPC) codes are investigated. We propose to use MIMO precoders to reduce the complexity for NB-LDPC encoded MIMO systems. A novel low complexity decoding algorithm for NB-LDPC codes is also proposed at the end of this thesis
Otnes, Roald. "Improved Receivers for Digital High Frequency Communications : Iterative Channel Estimation, Equalization, and Decoding (Adaptive Turbo Equalization)". Doctoral thesis, Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, 2002. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-86.
Pełny tekst źródłaWe address the problem of improving the throughput and the availability of digital communications in the High Frequency (HF, 3-30 MHz) band. In standardized military waveforms, the data is protected by an error-correcting code (ECC), and the code bits are shuffled by an interleaver and mapped onto a signal constellation for modulation onto a single carrier. Training sequences are multiplexed into the stream of transmitted symbols to aid the receiver in tracking the channel variations. The channel imposes severe time-varying intersymbol interference (ISI) as well as additive noise. Conventional receivers for such a system would first perform adaptive equalization (to mitigate the ISI) and symbol demapping, deinterleave the received code bits, and finally perform decoding, where the redundancy of the ECC is used to make high-quality decisions on the transmitted data bits even when bit errors have been introduced by the channel. Such a receiver is suboptimal because the equalizer does not make use of the redundancy introduced by the ECC, and is outperformed by an iterative scheme called turbo equalization. In turbo equalization, a.k.a. iterative equalization and decoding, soft information on the code bits is fed back from the decoder to the equalizer in an iterative fashion, and by performing the equalization and decoding tasks several times the bit error rates become significantly smaller than for a conventional “single-pass” receiver. Since we are dealing with an unknown time-varying channel, we must also perform channel estimation. We include channel estimation in the iterative loop of the turbo equalizer, using soft information fed back from the decoder as “training sequences” between the ordinary transmitted training sequences. Then, the receiver performs iterative channel estimation, equalization, and decoding, which can also be called adaptive turbo equalization. We have proposed a receiver using adaptive turbo equalization, and performed simulations using the MIL-STD-188-110 waveform at 2400 bps, transmitted over an ITU-R poor channel (a commonly used channel to test HF modems). We find that the proposed receiver outperforms a conventional receiver by 2-3 dB in terms of required signal-to-noise ratio to achieve a certain bit error rate. In this dissertation, we give an introduction to the fields of HF communications and standardized HF waveforms, channel modelling, and turbo equalization. We present an analysis of measured channel data to motivate our research in turbo equalization. We then present our research contributions to the field of turbo equalization: A low-complexity soft-in soft-out equalizer for time-varying channels, a comparative study of channel estimation algorithms using soft information as the input signal, and an investigation of adaptive turbo equalization using a technique known as EXIT charts. Finally, we present our main practical result, which is our proposed receiver and the corresponding simulation results.
Borlenghi, Filippo Verfasser], Gerd [Akademischer Betreuer] [Ascheid, Heinrich [Akademischer Betreuer] Meyr i Andreas [Akademischer Betreuer] Burg. "Silicon implementation of iterative detection and decoding for multi-antenna receivers / Filippo Borlenghi ; Gerd Ascheid, Heinrich Meyr, Andreas Burg". Aachen : Universitätsbibliothek der RWTH Aachen, 2015. http://d-nb.info/1128597942/34.
Pełny tekst źródłaBorlenghi, Filippo [Verfasser], Gerd [Akademischer Betreuer] Ascheid, Heinrich [Akademischer Betreuer] Meyr i Andreas [Akademischer Betreuer] Burg. "Silicon implementation of iterative detection and decoding for multi-antenna receivers / Filippo Borlenghi ; Gerd Ascheid, Heinrich Meyr, Andreas Burg". Aachen : Universitätsbibliothek der RWTH Aachen, 2015. http://d-nb.info/1128597942/34.
Pełny tekst źródłaSenst, Martin Verfasser], Gerd [Akademischer Betreuer] [Ascheid i Peter [Akademischer Betreuer] Vary. "On the design of iterative wireless receivers : the divergence minimization approach to approximate Bayesian inference / Martin Senst ; Gerd Ascheid, Peter Vary". Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/1162498137/34.
Pełny tekst źródłaSenst, Martin [Verfasser], Gerd [Akademischer Betreuer] Ascheid i Peter [Akademischer Betreuer] Vary. "On the design of iterative wireless receivers : the divergence minimization approach to approximate Bayesian inference / Martin Senst ; Gerd Ascheid, Peter Vary". Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/1162498137/34.
Pełny tekst źródłaEl, chall Rida. "Récepteur itératif pour les systèmes MIMO-OFDM basé sur le décodage sphérique : convergence, performance et complexité". Thesis, Rennes, INSA, 2015. http://www.theses.fr/2015ISAR0019/document.
Pełny tekst źródłaRecently, iterative processing has been widely considered to achieve near-capacity performance and reliable high data rate transmission, for future wireless communication systems. However, such an iterative processing poses significant challenges for efficient receiver design. In this thesis, iterative receiver combining multiple-input multiple-output (MIMO) detection with channel decoding is investigated for high data rate transmission. The convergence, the performance and the computational complexity of the iterative receiver for MIMO-OFDM system are considered. First, we review the most relevant hard-output and soft-output MIMO detection algorithms based on sphere decoding, K-Best decoding, and interference cancellation. Consequently, a low-complexity K-best (LCK- Best) based decoder is proposed in order to substantially reduce the computational complexity without significant performance degradation. We then analyze the convergence behaviors of combining these detection algorithms with various forward error correction codes, namely LTE turbo decoder and LDPC decoder with the help of Extrinsic Information Transfer (EXIT) charts. Based on this analysis, a new scheduling order of the required inner and outer iterations is suggested. The performance of the proposed receiver is evaluated in various LTE channel environments, and compared with other MIMO detection schemes. Secondly, the computational complexity of the iterative receiver with different channel coding techniques is evaluated and compared for different modulation orders and coding rates. Simulation results show that our proposed approaches achieve near optimal performance but more importantly it can substantially reduce the computational complexity of the system. From a practical point of view, fixed-point representation is usually used in order to reduce the hardware costs in terms of area, power consumption and execution time. Therefore, we present efficient fixed point arithmetic of the proposed iterative receiver based on LC-KBest decoder. Additionally, the impact of the channel estimation on the system performance is studied. The proposed iterative receiver is tested in a real-time environment using the MIMO WARP platform
Sahin, Serdar. "Advanced receivers for distributed cooperation in mobile ad hoc networks". Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0089.
Pełny tekst źródłaMobile ad hoc networks (MANETs) are rapidly deployable wireless communications systems, operating with minimal coordination in order to avoid spectral efficiency losses caused by overhead. Cooperative transmission schemes are attractive for MANETs, but the distributed nature of such protocols comes with an increased level of interference, whose impact is further amplified by the need to push the limits of energy and spectral efficiency. Hence, the impact of interference has to be mitigated through with the use PHY layer signal processing algorithms with reasonable computational complexity. Recent advances in iterative digital receiver design techniques exploit approximate Bayesian inference and derivative message passing techniques to improve the capabilities of well-established turbo detectors. In particular, expectation propagation (EP) is a flexible technique which offers attractive complexity-performance trade-offs in situations where conventional belief propagation is limited by computational complexity. Moreover, thanks to emerging techniques in deep learning, such iterative structures are cast into deep detection networks, where learning the algorithmic hyper-parameters further improves receiver performance. In this thesis, EP-based finite-impulse response decision feedback equalizers are designed, and they achieve significant improvements, especially in high spectral efficiency applications, over more conventional turbo-equalization techniques, while having the advantage of being asymptotically predictable. A framework for designing frequency-domain EP-based receivers is proposed, in order to obtain detection architectures with low computational complexity. This framework is theoretically and numerically analysed with a focus on channel equalization, and then it is also extended to handle detection for time-varying channels and multiple-antenna systems. The design of multiple-user detectors and the impact of channel estimation are also explored to understand the capabilities and limits of this framework. Finally, a finite-length performance prediction method is presented for carrying out link abstraction for the EP-based frequency domain equalizer. The impact of accurate physical layer modelling is evaluated in the context of cooperative broadcasting in tactical MANETs, thanks to a flexible MAC-level simulator
Vargas, Paredero David Eduardo. "Transmit and Receive Signal Processing for MIMO Terrestrial Broadcast Systems". Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/66081.
Pełny tekst źródła[ES] La tecnología de múltiples entradas y múltiples salidas (MIMO) en redes de Televisión Digital Terrestre (TDT) tiene el potencial de incrementar la eficiencia espectral y mejorar la cobertura de red para afrontar las demandas de uso del escaso espectro electromagnético (e.g., designación del dividendo digital y la demanda de espectro por parte de las redes de comunicaciones móviles), la aparición de nuevos contenidos de alta tasa de datos (e.g., ultra-high definition TV - UHDTV) y la ubicuidad del contenido (e.g., fijo, portable y móvil). Es ampliamente reconocido que MIMO puede proporcionar múltiples beneficios como: potencia recibida adicional gracias a las ganancias de array, mayor robustez contra desvanecimientos de la señal gracias a la diversidad espacial y mayores tasas de transmisión gracias a la ganancia por multiplexado del canal MIMO. Estos beneficios se pueden conseguir sin incrementar la potencia transmitida ni el ancho de banda, pero normalmente se obtienen a expensas de una mayor complejidad del sistema tanto en el transmisor como en el receptor. Las ganancias de rendimiento finales debido al uso de MIMO dependen directamente de las características físicas del entorno de propagación como: la correlación entre los canales espaciales, la orientación de las antenas y/o los desbalances de potencia sufridos en las antenas transmisoras. Adicionalmente, debido a restricciones en la complejidad y aritmética de precisión finita en los receptores, es fundamental para el rendimiento global del sistema un diseño cuidadoso de algoritmos específicos de procesado de señal. Esta tesis doctoral se centra en el procesado de señal, tanto en el transmisor como en el receptor, para sistemas TDT que implementan MIMO-BICM (Bit-Interleaved Coded Modulation) sin canal de retorno hacia el transmisor desde los receptores. En el transmisor esta tesis presenta investigaciones en precoding MIMO en sistemas TDT para superar las degradaciones del sistema debidas a diferentes condiciones del canal. En el receptor se presta especial atención al diseño y evaluación de receptores prácticos MIMO-BICM basados en información cuantificada y a su impacto tanto en la memoria del chip como en el rendimiento del sistema. Estas investigaciones se llevan a cabo en el contexto de estandarización de DVB-NGH (Digital Video Broadcasting - Next Generation Handheld), la evolución portátil de DVB-T2 (Second Generation Terrestrial), y ATSC 3.0 (Advanced Television Systems Commitee - Third Generation) que incorporan MIMO-BICM como clave tecnológica para superar el límite de Shannon para comunicaciones con una única antena. No obstante, esta tesis doctoral emplea un método genérico tanto para el diseño, análisis y evaluación, por lo que los resultados e ideas pueden ser aplicados a otros sistemas de comunicación inalámbricos que empleen MIMO-BICM.
[CAT] La tecnologia de múltiples entrades i múltiples eixides (MIMO) en xarxes de Televisió Digital Terrestre (TDT) té el potencial d'incrementar l'eficiència espectral i millorar la cobertura de xarxa per a afrontar les demandes d'ús de l'escàs espectre electromagnètic (e.g., designació del dividend digital i la demanda d'espectre per part de les xarxes de comunicacions mòbils), l'aparició de nous continguts d'alta taxa de dades (e.g., ultra-high deffinition TV - UHDTV) i la ubiqüitat del contingut (e.g., fix, portàtil i mòbil). És àmpliament reconegut que MIMO pot proporcionar múltiples beneficis com: potència rebuda addicional gràcies als guanys de array, major robustesa contra esvaïments del senyal gràcies a la diversitat espacial i majors taxes de transmissió gràcies al guany per multiplexat del canal MIMO. Aquests beneficis es poden aconseguir sense incrementar la potència transmesa ni l'ample de banda, però normalment s'obtenen a costa d'una major complexitat del sistema tant en el transmissor com en el receptor. Els guanys de rendiment finals a causa de l'ús de MIMO depenen directament de les característiques físiques de l'entorn de propagació com: la correlació entre els canals espacials, l'orientació de les antenes, i/o els desequilibris de potència patits en les antenes transmissores. Addicionalment, a causa de restriccions en la complexitat i aritmètica de precisió finita en els receptors, és fonamental per al rendiment global del sistema un disseny acurat d'algorismes específics de processament de senyal. Aquesta tesi doctoral se centra en el processament de senyal tant en el transmissor com en el receptor per a sistemes TDT que implementen MIMO-BICM (Bit-Interleaved Coded Modulation) sense canal de tornada cap al transmissor des dels receptors. En el transmissor aquesta tesi presenta recerques en precoding MIMO en sistemes TDT per a superar les degradacions del sistema degudes a diferents condicions del canal. En el receptor es presta especial atenció al disseny i avaluació de receptors pràctics MIMO-BICM basats en informació quantificada i al seu impacte tant en la memòria del xip com en el rendiment del sistema. Aquestes recerques es duen a terme en el context d'estandardització de DVB-NGH (Digital Video Broadcasting - Next Generation Handheld), l'evolució portàtil de DVB-T2 (Second Generation Terrestrial), i ATSC 3.0 (Advanced Television Systems Commitee - Third Generation) que incorporen MIMO-BICM com a clau tecnològica per a superar el límit de Shannon per a comunicacions amb una única antena. No obstant açò, aquesta tesi doctoral empra un mètode genèric tant per al disseny, anàlisi i avaluació, per la qual cosa els resultats i idees poden ser aplicats a altres sistemes de comunicació sense fils que empren MIMO-BICM.
Vargas Paredero, DE. (2016). Transmit and Receive Signal Processing for MIMO Terrestrial Broadcast Systems [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/66081
TESIS
Premiado
Hassan, Khurrum Kwon H. M. "LDPC encoded pilots for iterative receiver improvement". Diss., 2005. http://il.proquest.com/products_umi/dissertations.
Pełny tekst źródła"December 2005." Title from PDF title page (viewed on April 22, 2007). Thesis adviser: H. M. Kwon. UMI Number: AAT 1436560 Includes bibliographic references (leaves 31-35).
Hassan, Khurrum. "LDPC encoded pilots for iterative receiver improvement". Thesis, 2005. http://hdl.handle.net/10057/769.
Pełny tekst źródłaThesis (M.S.)--Wichita State University, College of Engineering, Dept. of Electrical and Computer Engineering.
"December 2005."
Reed, Mark C. "Iterative receiver techniques for coded multiple access communication systems". 1999. http://arrow.unisa.edu.au:8081/1959.8/24962.
Pełny tekst źródłaThesis (PhD)--University of South Australia, 1999
Karuppasami, Sridhar. "LDPC code based iterative receiver techniques for phase varying channels". 2009. http://arrow.unisa.edu.au:8081/1959.8/83062.
Pełny tekst źródłaThesis (PhDTelecommunications)--University of South Australia, 2009
Yu, Ying-Shin, i 游英信. "Iterative Parallel Interference Cancellation Receiver with QR Decompositionin MIMO System". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/87321917195676937137.
Pełny tekst źródła中原大學
電子工程研究所
96
In this thesis, we propose a new iterative parallel interference cancellation receiver architecture. QR-decomposition algorithm is used to compute the transmitted signals roughly in advance, and followed by an iterative parallel interference cancellation (Iterative PIC) to calculate them several times. The simulation shows that the new receiver architecture not only keeps the original frame error rate(FER) in several iteration but also reduces large number of operations comparing with standard iterative parallel interference cancellation (Iterative PIC-STD) and iterative parallel interference cancellation with decision statistics combining (Iterative PIC-DSC).
Lin, Ray-Kao, i 林瑞國. "An Efficient Iterative Multiuser Receiver for Turbo-Coded CDMA Systems". Thesis, 2001. http://ndltd.ncl.edu.tw/handle/26253619167269658617.
Pełny tekst źródła國立清華大學
電機工程學系
89
Abstract Turbo codes can provide surprising bit error rate performance on digital communications. They have been considered for use in third-generation wireless mobile communication systems, such as direct-sequence code-division-multiple-access (DS-CDMA) systems. In order to provide better performance in DS-CDMA systems, an appropriate joint design of the turbo code decoder and the multiuser detector is highly desirable. In this thesis, an efficient iterative multiuser receiver is proposed for turbo-coded CDMA systems. The proposed structure consists of a likelihood calculator, a metric generator, and a bank of K turbo decoders, where K is the number of users and one multiuser detection iteration includes only one turbo decoding iteration. The metric generator can make use of the reliability information fed back from the turbo decoders to provide the a priori information for use in the turbo decoders. The reliability information passed from the turbo decoders to the metric generator in the conventional iterative scheme is either the extrinsic information or the a posteriori information. In this thesis, we propose a simple rule to choose the type of reliability information delivery; if the component decoders inside a turbo decoder have the same decision for the concerned symbol at an iteration, the extrinsic information generated at the turbo decoder is passed to the metric generator, or the a posteriori information is passed. Computer simulation results show that the iterative scheme with the proposed rule outperforms the conventional schemes with no increase in computational complexity. In addition, we propose a reduced-complexity metric generator for iterative coded CDMA systems. As compared to the conventional method, the proposed metric generator achieves a significant complexity reduction. For the optimal iterative multiuser receiver, the complexity per user bit per iteration is reduced from O(2KK) to O(2K/K). For the suboptimal iterative multiuser receiver proposed by Reed et al., the corresponding complexity is further reduced to be O(1). The good-performance and low-complexity features make the proposed approaches attractive for use in practical applications.
Tsai, Song-Da, i 蔡松達. "Iterative Receiver Design for OFDM Systems in Impulsive Noise Channels". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/51948126954434440708.
Pełny tekst źródła淡江大學
電機工程學系碩士班
103
In this thesis, the orthogonal frequency division multiple (OFDM) signals with blanking nonlinearity in impulsive noise channels is presented. Blanking nonlinearity has been widely used in practical OFDM systems to suppress impulsive noise at the expense of reducing signal power and generating intercarrier interference (ICI). To improve the performance of blanking nonlinearity element, we propose an iterative interference cancellation scheme which can effectively reduce the level of ICI caused by the blanking operation at the OFDM receiver. With adaptive blanking threshold for each iteration, the proposed iterative receiver design can converge to its best performance with only three iterations. Simulation results achieved by the proposed scheme significant improvement.