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:
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.
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:
Download or read book Channel Estimation Data Detection and Carrier Frequency Offset Estimation in OFDM Systems written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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
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:
Download or read book Carrier Frequency Offset and Channel Estimation with Superimposed Training Sequence in OFDM Systems written by Chia-Hua Chang and published by . This book was released on 2008 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Comparative Analysis to Remove CFO in OFDM System written by Santosh Gupta and published by LAP Lambert Academic Publishing. This book was released on 2012 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most important aspect in an OFDM is frequency and time synchronization as this form the reason for orthogonality between the subcarriers. However OFDM is susceptible to synchronization errors between transmitter and receiver local oscillator frequencies. This error is known as the carrier frequency offset (CFO) and causes ICI and also destroys the orthogonality between the subcarriers. In this literature we study the effects that CFO can cause to the SNR in an OFDM system, estimate the amount of frequency offset. Also the performance of the estimate is studied in a multipath environment. This book discusses and investigates the estimation of carrier offset frequency in orthogonal frequency division multiplexing (OFDM) mobile systems. Although OFDM is resistant to multipath fading, it requires a high degree of synchronization to maintain sub-carrier orthogonality. Therefore the level of performance of the system depends first on the accuracy in estimating the carrier frequency offset and then the estimation of the channel.
Download or read book Carrier Frequency Offset Estimation for OFDM Systems Using Subspace based Methods written by 戴尉任 and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Studies in Carrier Frequency Offset Estimation for OFDM Systems written by Rajesh Ambati and published by . This book was released on 2003 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Link Enhancement Techniques for Future Multicarrier Systems written by Muhammad Obaid Obaid Ullah Ullah and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Orthogonal Frequency Division Multiplexing (OFDM) is very effective in combating the distortive effects of wireless channel and promises high data rate capabilities with reasonable complexity and accuracy. Other advantages of OFDM include significantly simple equalizer requirement, high spectral efficiency, computationally inexpensive implementation, increased immunity to impulse noise, ability to support adaptive modulation schemes and high flexibility in resource allocation. This thesis investigates two vital issues regarding the OFDM system design requirements, namely, Channel Estimation (CE) and Carrier Frequency Offset Estimation (CFOE). The accuracy of these two estimators plays a crucial role in the overall performance of OFDM systems. Whether it is a single antenna or a multi-antenna OFDM system, accurate channel estimation (CE) is required for coherent reception. The channel estimation requirement is further exacerbated in the case of OFDM systems with multiple transmit and/or receive antennas as the signals are simultaneously transmitted / received and consequently arrive at the receiver through many channels. CE techniques for OFDM systems are broadly classified into pilot-aided and blind techniques. As compared to blind algorithms, pilot-aided CE algorithms are more robust to high Doppler frequency, and hence, are useful for high mobility applications. One of the major drawbacks of OFDM is its sensitivity to time and frequency synchronization errors. Owing to its inherent cyclic symbol structure, the time synchronization requirements are somewhat relaxed for OFDM systems. Conversely, the frequency synchronization requirements are more stringent because of its tightly packed subcarriers. The frequency offset results in loss of orthogonality of subcarriers which subsequently causes significant performance degradation. Therefore, it is imperative to estimate the CFO and thereafter eliminate or minimize its effects. This thesis proposes a new set of techniques for pilot-aided CE namely "undersampledchannel estimation" for OFDM systems. In such techniques, the number of pilots used to sample the channel are less than those allowed by Nyquist sampling theorem. Virtually blind (VB) CE uses only one pilot to estimate the channel frequency response (CFR). The performance of VB CE is hindered by the occurrence of CFR inversion (CFRI). Uniformly spaced fixed additional pilots and dynamically assigned additional pilots were then augmented with the only pilot in order to take more samples of channel and to stop propagating CFRIeffect further. For joint blind channel and control signal estimation for OFDM systems, the detectability of control information dependent (CID) pilot sequences is highly dependent on the type of sequences used. An algorithm to design a new set of pilot sequences with better detectability is proposed in this thesis.
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
Download or read book Blind Carrier Frequency Offset Estimation for Differentially Coded OFDM Systems written by Binwei Weng and published by . This book was released on 2003 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computer Engineering and Technology written by Weixia Xu and published by Springer. This book was released on 2016-01-13 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 19th CCF Conference on Computer Engineering and Technology, NCCET 2015, held in Hefei, China, in October 2015. The 18 papers presented were carefully reviewed and selected from 158 submissions. They are organized in topical sections on processor architecture; application specific processors; computer application and software optimization; technology on the horizon.
Download or read book Blind Estimation of Carrier Frequency Offset and Symbol Timing Offset in OFDM and OFDMA Systems written by 王彥青 and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Electronic Commerce Web Application and Communication written by David Jin and published by Springer Science & Business Media. This book was released on 2012-02-24 with total page 605 pages. Available in PDF, EPUB and Kindle. Book excerpt: ECWAC2012 is an integrated conference devoted to Electronic Commerce, Web Application and Communication. In the this proceedings you can find the carefully reviewed scientific outcome of the second International Conference on Electronic Commerce, Web Application and Communication (ECWAC 2012) held at March 17-18,2012 in Wuhan, China, bringing together researchers from all around the world in the field.
Download or read book Carrier Frequency Offset in OFDM written by Javad Hoseyni and published by LAP Lambert Academic Publishing. This book was released on 2013 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Orthogonal Frequency Division Multiplexing (OFDM) is a popular multicarrier modulation technique with the ability to provide high data rates over echo-ladened channels. It has excellent robustness to impairments caused by multipath, which includes frequency selective fading. Unfortunately, OFDM is very sensitive to the carrier frequency o set (CFO) that is introduced by the down conversion process. The objective of this book is to develop and analyze an algorithm for blind CFO recovery suitable for use with a practical zero-Intermediate Frequency (zero-IF) OFDM telecommunications system. A blind CFO recovery algorithm based upon characteristics of the received signal power spectrum is proposed. The algorithm's error performance is mathematically analyzed and the theoretical results are veri ed with simulations. The simulation shows that the performance of the proposed algorithm agrees with the mathematical analysis. The proposed algorithm performs well in comparison and does not su er from many of the disadvantages of existing blind CFO recovery techniques. Most notably, its performance is not signi cantly degraded by noisy, frequency selective channels."
