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Author : Rami Khal
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (931 download)
Download or read book Joint Channel and Frequency Offset Estimation for Wireless Communications written by Rami Khal and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yufei Jiang
Publisher : Springer
ISBN 13 : 3319249843
Total Pages : 96 pages
Book Rating : 4.3/5 (192 download)
Download or read book Semi-Blind Carrier Frequency Offset Estimation and Channel Equalization written by Yufei Jiang and published by Springer. This book was released on 2015-12-01 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: This SpringerBrief investigates the performance of semi-blind independent component analysis (ICA) based equalization and carrier frequency offset estimation approaches (CFO) for a number of orthogonal frequency division multiplexing (OFDM) based wireless communication systems. It provides a comprehensive overview of the challenges of channel equalization and frequency synchronization for different wireless systems. The authors present the wireless communication channel and system models. Key existing CFO estimation methods are reviewed, along with a number of the training based and non-training based (blind) channel estimation methods. This is followed by a study of ICA and its applications to OFDM-based wireless communication systems. Later chapters provide a detailed description of recent research on semi-blind CFO estimation and ICA based equalization approaches for various wireless communication systems including multiple-input multiple-output (MIMO) OFDM and coordinated multipoint (CoMP) systems. Semi-blind CFO estimation and equalization structures provide a spectrum-efficient and high-performance solution for high speed wireless communications. This book is suitable for postgraduate students, researchers or professionals in the area of wireless communications.
Author : Prof François Horlin
Publisher : John Wiley & Sons
ISBN 13 : 0470759038
Total Pages : 256 pages
Book Rating : 4.4/5 (77 download)
Download or read book Digital Compensation for Analog Front-Ends written by Prof François Horlin and published by John Wiley & Sons. This book was released on 2008-09-15 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: The desire to build lower cost analog front-ends has triggered interest in a new domain of research. Consequently the joint design of the analog front-end and of the digital baseband algorithms has become an important field of research. It enables the wireless systems and chip designers to more effectively trade the communication performance with the production cost. Digital Compensation for Analog Front-Ends provides a systematic approach to designing a digital communication system. It covers in detail the digital compensation of many non-idealities, for a wide class of emerging broadband standards and with a system approach in the design of the receiver algorithms. In particular, system strategies for joint estimation of synchronization and front-end non-ideality parameters are emphasized. The book is organized to allow the reader to gradually absorb the important information and vast quantity of material on this subject. The first chapter is a comprehensive introduction to the emerging wireless standards which is followed by a detailed description of the front-end non-idealities in chapter two. Chapter three then uses this information to explore what happens when the topics introduced in the first two chapters are merged. The book concludes with two chapters providing an in-depth coverage of the estimation and compensation algorithms. This book is a valuable reference for wireless system architects and chip designers as well as engineers or managers in system design and development. It will also be of interest to researchers in industry and academia, graduate students and wireless network operators. Presents a global, systematic approach to the joint design of the analog front-end compensation, channel estimation, synchronization and of the digital baseband algorithms Describes in depth the main front-end non-idealities such as phase noise, IQ imbalance, non-linearity, clipping, quantization, carrier frequency offset, sampling clock offset and their impact on the modulation Explains how the non-idealities introduced by the analog front-end elements can be compensated digitally Methodologies are applied to the emerging Wireless Local Area Network and outdoor Cellular communication systems, hence covering OFDM(A), SC-FDE and MIMO Written by authors with in-depth expertise developed in the wireless research group of IMEC and projects covering the main broadband wireless standards
Author : Ye Geoffrey Li
Publisher : Springer Science & Business Media
ISBN 13 : 0387302352
Total Pages : 314 pages
Book Rating : 4.3/5 (873 download)
Download or read book Orthogonal Frequency Division Multiplexing for Wireless Communications written by Ye Geoffrey Li and published by Springer Science & Business Media. This book was released on 2006-05-31 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: Orthogonal Frequency Division Multiplexing for Wireless Communications is an edited volume with contributions by leading authorities in the subject of OFDM. Its coverage consists of principles, important wireless topics (e.g. Synchronization, channel estimation, etc.) and techniques. Included is information for advancing wireless communication in a multipath environment with an emphasis on implementation of OFDM in base stations. Orthogonal Frequency Division Multiplexing for Wireless Communications provides a comprehensive introduction of the theory and practice of OFDM. To facilitate the readers, extensive subject indices and references are given at the end of the book. Even though each chapter is written by different experts, symbols and notations in all chapters of the book are consistent.
Author : Cheng Li
Publisher :
ISBN 13 : 9781374709478
Total Pages : pages
Book Rating : 4.7/5 (94 download)
Download or read book Carrier Frequency Offset Estimation for Multicarrier Communications written by Cheng Li and published by . This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Carrier Frequency Offset Estimation for Multicarrier Communications" by Cheng, Li, 李鋮, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled Carrier Frequency Offset Estimation for Multicarrier Communications Submitted by Li Cheng For the degree of Master of Philosophy at the University of Hong Kong in Feb., 2004 Multicarrier (MC) transmission is a promising technology in broadband wireless access involving high-throughput data transmission. MC communications are advantageous over single-carrier transmission in dealing with inter-symbol interference (ISI) due to the channel delay spread. However, MC communications also have certain drawbacks, including the vulnerability to carrier frequency offset (CFO) arising from the difference of oscillator frequencies between the transmitter and the receiver or from the Doppler shift. The performance of MC systems degrades severely even if the CFO is a small fraction of the subcarrier spacing. Therefore, correction of CFO is very important for MC communications. This thesis considers two variants of MC technologies, OFDM and MC-CDMA, and investigates CFO estimation for both systems. For OFDM systems, a semi-blind CFO estimation algorithm utilizing the embedded pilot tones, which are primarily used for channel estimation, is proposed for slowly-varying multipath channels. The algorithm is bandwidth efficient because it requires no training symbols. It is also demonstrated that the proposed algorithm can be regarded as the general form of the virtual-carrier-based CFO estimation algorithm previously proposed in the literature. For the purpose of practical implementation, a reduced-complexity estimator is also developed. It offers a tradeoff between estimation accuracy and implementation complexity. It is shown by simulation results that the proposed algorithm outperforms the cyclic-prefix-based algorithm in terms of the estimated CFO mean-square error performance. For MC- CDMA systems, a blind CFO estimator is proposed for the downlink transmission, where all users' signals are synchronously transmitted. The estimation scheme consists of two stages: feed-forward acquisition and error-feedback data-directed tracking. The acquisition stage is implemented utilizing the orthogonality among spreading codes and it is capable of bringing the CFO as large as the signal bandwidth to a small value. The residual CFO is refined by the tracking stage, which estimates the CFO and users' data simultaneously based on the maximum likelihood criterion. A reduced-complexity estimator based on the zero-padding FFT technique is also developed to reduce the implementation complexity. The performance of the proposed algorithm is investigated by extensive computer simulations. DOI: 10.5353/th_b2972533 Subjects: Signal processing - Digital techniques - Mathematics Multiplexing Wireless communication systems
Author : Jie Zhu
Publisher :
ISBN 13 :
Total Pages : 246 pages
Book Rating : 4.:/5 (614 download)
Download or read book Channel Estimation and Carrier Frequency Offset Estimation for Wireless OFDM Systems written by Jie Zhu and published by . This book was released on 2004 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Xiangnian Zeng
Publisher :
ISBN 13 :
Total Pages : 250 pages
Book Rating : 4.:/5 (463 download)
Download or read book Carrier Frequency Offset Estimation for Orthogonal Frequency Division Multiplexing Systems written by Xiangnian Zeng and published by . This book was released on 2008 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Giorgio A. Vitetta
Publisher : John Wiley & Sons
ISBN 13 : 1118576608
Total Pages : 849 pages
Book Rating : 4.1/5 (185 download)
Download or read book Wireless Communications written by Giorgio A. Vitetta and published by John Wiley & Sons. This book was released on 2013-03-29 with total page 849 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the theoretical elements at the basis of various classes of algorithms commonly employed in the physical layer (and, in part, in MAC layer) of wireless communications systems. It focuses on single user systems, so ignoring multiple access techniques. Moreover, emphasis is put on single-input single-output (SISO) systems, although some relevant topics about multiple-input multiple-output (MIMO) systems are also illustrated. Comprehensive wireless specific guide to algorithmic techniques Provides a detailed analysis of channel equalization and channel coding for wireless applications Unique conceptual approach focusing in single user systems Covers algebraic decoding, modulation techniques, channel coding and channel equalisation
Author : 黃毓炫
Publisher :
ISBN 13 :
Total Pages : 96 pages
Book Rating : 4.:/5 (658 download)
Download or read book Joint Estimation of Carrier Frequency Offset, Sampling Frequency Offset and Channel Response for OFDM Systems written by 黃毓炫 and published by . This book was released on 2009 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kosai Raoof
Publisher : ScientificResearchPublishing
ISBN 13 : 1935068024
Total Pages : 252 pages
Book Rating : 4.9/5 (35 download)
Download or read book Advanced Mimo Systems written by Kosai Raoof and published by ScientificResearchPublishing. This book was released on 2009 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Suvra Sekhar Das
Publisher : CRC Press
ISBN 13 : 1000793850
Total Pages : 236 pages
Book Rating : 4.0/5 (7 download)
Download or read book Orthogonal Time Frequency Space Modulation written by Suvra Sekhar Das and published by CRC Press. This book was released on 2022-09-01 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last few decades wireless communications, especially Mobile Communication Technology, has evolved by leaps and bounds. The mobile communication industry has named the different major changes as generations namely 1G, 2G,..5G. We are presently looking at deployment of 5G technologies. The work for 6G has already started. This book is focused on the waveform design of 6G. It presents a discourse on a potential waveform for 6G namely Orthogonal Time Frequency Space (OTFS) modulation. OTFS has a distinct feature when compared to earlier generation waveforms such that information bearing signal is placed in the delay Doppler domain as opposed to the usual placement of such signals in the time-frequency domain. This unique feature of OTFS enables it to overcome several disadvantages of a very popular and highly successful waveform namely Orthogonal Frequency Division Multiplexing (OFDM). OTFS is known to be more resilient to frequency offset and Doppler which is one of the key drawbacks of OFDM. With this feature, OTFS, can support higher mobility as well as higher frequency bands of operation which is also one of the key requirements of the next generation wireless communication technologies. The implementation complexity of OTFS remains comparable to that of OFDM. It is found that OTFS provides significant SNR advantage, higher resilience, lower PAPR, lower out of band signal leakage and higher multi-user spectral efficiency than that of OFDM. This book addresses• Fundamental signal model of OTFS. • Receiver design for OTFS• Channel estimation in OTFS• Multiple Access through non-orthogonal multiple access (NOMA-OTFS) The contents of the books are primarily outcome of the research work done at the G. S. Sanyal School of Telecommunications, Indian Institute of Technology Kharagpur, Kharagpur, India. Orthogonal Time Frequency Space Modulation : A waveform for 6G is ideal for personnel the wireless communication industry as well as academic staff and master/research students in electrical engineering with a specialization in wireless communications.
Author : Patrick Sénac
Publisher : Springer Science & Business Media
ISBN 13 : 3642291562
Total Pages : 467 pages
Book Rating : 4.6/5 (422 download)
Download or read book Wireless Communications and Applications written by Patrick Sénac and published by Springer Science & Business Media. This book was released on 2012-03-29 with total page 467 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the thoroughly refereed post-conference proceedings of the First International ICST Conference on Wireless Communications and Applications, ICWCA 2011, held in Sanya, China, in August 2011. The 43 revised full papers presented were carefully reviewed and selected from around 90 submissions and cover a wide range of topics as mobile ad hoc networks, sensor networks, network architectural design, network protocol design, local area networks, MAC, routing, and transport protocols, quality of service provisioning, reliability and fault tolerance issues, resource allocation and management, signal processing, medical imaging, data aggregation techniques, security and privacy issues, wireless computing and applications for wireless network as smart grid, agriculture, health care, smart home, conditional monitoring, etc.
Author : Dexu Lin
Publisher :
ISBN 13 : 9780494398227
Total Pages : 336 pages
Book Rating : 4.3/5 (982 download)
Download or read book Variational Inference Methods for Signal Processing in Wireless Communications written by Dexu Lin and published by . This book was released on 2008 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: The transmission of information over a wireless medium often introduces additional unknown variables corrupting the primary signal of interest. These unknowns originate from different sources (e.g., channel distortions or inultiuser interference) and possess different characteristics (additive or multiplicative, static or time-varying). A consequence of this phenomenon is that the extra unknowns need to be taken into consideration at the receiver when detecting the desired signal. The factor graph depiction of this problem setting is straightforward. Yet performing exact inference on the graph to optimally remove the effects of distortion via direct belief propagation is often computationally prohibitive. This thesis aims to establish a new framework, based on variational inference, to guide the design of near-optimal algorithms for joint detection and estimation in such a scenario. The application of this framework in the OFDM area results in a novel detector with phase noise cancellation capability. The proposed algorithm generates near optimal soft estimates of the desired OFDM signal in the presence of unknown phase noise. To provide accurate channel information for this detector, we also propose an optimal (maximum a posteriori) joint estimator for the channel impulse response, carrier frequency offset amid phase noise. This implies that the frequency synchronization and channel estimation algorithms for OFDM can be derived from statistical estimation theory even in the presence of phase noise. This variational inference framework is also used to established a unified approach for studying joint detection and decoding in multiple-access and ISI channels. It produces low-complexity, near-optimal detector/estimator designs for turbo receivers, including the built-in capability to deal with channel uncertainty. Various existing turbo receivers can be seen as its special cases, leading to insights on how new improvements can be made.
Author : Xiaoyu Fu
Publisher :
ISBN 13 :
Total Pages : 314 pages
Book Rating : 4.:/5 (762 download)
Download or read book Synchronization and Channel Estimation in Broadband Wireless Systems written by Xiaoyu Fu and published by . This book was released on 2006 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: Broadband wireless communication requires fast and reliable synchronization and channel estimation with low overhead and computation complexity. In this work, we address the above issue by two aspects. First, we develop training signal design for not only achieving low complexity reliable receiver processing algorithms, but also improving the theoretical limit. Second, we develop low complexity high performance receiver algorithms for both single user and multiuser system. We first investigate the optimal periodic preamble design for frequency offset estimation over frequency-selective fading channels by minimizing the average Cramer-Rao bound (CRB). The proposed design includes the optimal sequence structure design and the optimal signal design, and brings new dimensions into the existing theory of the training signal designs for frequency offset estimation. To track the channel variations as well as the phase shift, data-pilot multiplexing scheme is commonly used in OFDM (orthogonal frequency division multiplex) systems. The two performance metrics which are not jointly incorporated yet in the existing data-pilot multiplexing scheme design are the number of data tones transmitted over one OFDM symbol (data throughput) and the channel response and phase estimation performance. In this work, we propose two multiplexing schemes which significantly improve the estimation performance with low data throughput sacrifice, resulting in a substantial performance improvement over current pilot-data multiplexed schemes. In the uplink of OFDMA (orthogonal frequency division multiple access) systems, synchronization and channel estimation problems become more challenging since multiuser, multi-dimension parameters rather than single user parameters issue have to be estimated. The existing techniques have one or more of the following unfavorable requirements: high computation complexity, loss of frequency diversity, and performance sensitivity to the number of subscribe stations. To address the above drawbacks, we propose several training designs as well as the corresponding estimators for OFDMA uplink in this thesis, yielding robust low complexity estimators with enhanced performance.
Author : 吳凱迪
Publisher :
ISBN 13 :
Total Pages : 106 pages
Book Rating : 4.:/5 (318 download)
Download or read book Joint Estimation of I/Q Imbalance, Carrier Frequency Offset, Phase Noise, and Channel Response for Broadband Communication Systems written by 吳凱迪 and published by . This book was released on 2008 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Galib Asadullah M. M.
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (268 download)
Download or read book Robust Wireless Communications Under Co-channel Interference and Jamming written by Galib Asadullah M. M. and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Interference and jamming severely disrupt our ability to communicate by decreasing the effective signal-to-noise ratio and by making parameter estimation difficult at the receiver. The objective of this research work is to design robust wireless systems and algorithms to suppress the adverse effects of non-intentional co-channel interference (CCI) or intentional jamming. In particular, we develop chip-combining schemes with timing, channel, and noise-power estimation techniques, all of which mitigate CCI or jamming. We also exploit the spatial diversity and iterative receiver techniques for this purpose. Most of the existing timing estimation algorithms are robust against either large frequency offsets or CCI, but not against both at the same time. Hence, we develop a new frame boundary estimation method that is robust in the presence of severe co-channel interference and large carrier-frequency offsets. To solve the high peak-to-average-power ratio problem of a multicarrier code division multiple access (MC-CDMA) system and enhance its robustness against fading and jamming, we propose a constant-envelope MC-CDMA system employing cyclic delay diversity (CDD) as transmit diversity. We analyze the diversity order, coding gain, and bit-error rate upper bound. We also propose a blind, accurate, and computationally efficient signal-to-noise ratio estimator for the proposed system. We propose a configurable robust anti-jam receiver that estimates the frequency- or time-domain jammer state information (JSI) and uses it for chip combining in the corresponding domain. A soft-JSI-based chip-combining technique is proposed that outperforms conventional hard-JSI-based chip combining. We also derive a chip combiner that provides sufficient statistics to the decoder. Channel estimation is necessary for coherent signal detection and JSI estimation. Conversely, knowledge of the jamming signal power and JSI of different subcarriers can improve the accuracy of the channel estimates. Hence, we propose joint iterative estimation of the multiple-input multiple-output (MIMO) channel coefficients, jamming power, and JSI for a coded MC-CDMA MIMO system operating under jamming and a time-varying frequency-selective fading channel. Finally, we reduce the computational complexity of the JSI-based anti-jam receivers by introducing an expectation-maximization-based joint channel and noise-covariance estimator that does not need either the subcarrier JSI or the individual powers of the AWGN and jamming signal.
Author : Kai Wu
Publisher : John Wiley & Sons
ISBN 13 : 1119982936
Total Pages : 327 pages
Book Rating : 4.1/5 (199 download)
Download or read book Joint Communications and Sensing written by Kai Wu and published by John Wiley & Sons. This book was released on 2022-11-21 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt: JOINT COMMUNICATIONS AND SENSING Authoritative resource systematically introducing JCAS technologies and providing valuable information and knowledge to researchers and engineers Based on over six years of dedicated research on joint communications and sensing (JCAS) by the authors, their collaborators, and students, Joint Communications and Sensing is the first book to comprehensively cover the subject of JCAS, which is expected to deliver huge cost and energy savings, and therefore has become a hallmark of future 6G and next generation radar technologies. The book has three parts. Part I presents the basic JCAS concepts and applications and the basic signal processing algorithms to support JCAS. Part II covers communications-centric JCAS designs that describe how sensing can be integrated into communications networks such as 5G and 6G. Part III presents ways to integrate communications in various radar sensing technologies and platforms. Specific sample topics covered in Joint Communications and Sensing include: Three categories of JCAS systems, potential sensing applications of JCAS, signal processing fundamentals, and channel models for communications and radar Frameworks for perceptive mobile networks (PMNs), system modifications to enable PMN sensing, and PMN system issues Orthogonal time-frequency space waveform-based JCAS for IoT, including signal models, echo pre-processing, and target parameter estimation Joint Communications and Sensing provides valuable information and knowledge to researchers and engineers in the communications and radar sensing communities and industries, enabling them to upskill and prepare for JCAS technology research and development. The text is of particular interest to engineers in the wireless communications industry who are pursuing new capabilities in 6G.
