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Integrated Self Interference Cancellation For Full Duplex And Frequency Division Duplexing Wireless Communication Systems
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Book Synopsis Integrated Self-Interference Cancellation for Full-Duplex and Frequency-Division Duplexing Wireless Communication Systems by : Jin Zhou
Download or read book Integrated Self-Interference Cancellation for Full-Duplex and Frequency-Division Duplexing Wireless Communication Systems written by Jin Zhou and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: To enable experimental characterization of full-duplex MAC layer algorithms, a cross-layered software-defined full-duplex radio testbed has been developed. In collaboration with researchers from the field of micro-electro-mechanical systems, we demonstrate a multi-band frequency-division duplexing system using a cavity-filter-based tunable duplexer and our integrated widely-tunable self-interference-cancelling receiver.
Book Synopsis Integrated Wideband Self-interference Cancellation Techniques for FDD and Full-duplex Wireless Communication by : Tong Zhang
Download or read book Integrated Wideband Self-interference Cancellation Techniques for FDD and Full-duplex Wireless Communication written by Tong Zhang and published by . This book was released on 2017 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Adaptive Baseband Interference Cancellation for Full Duplex Wireless Communication by : Sanjay Avasarala
Download or read book Adaptive Baseband Interference Cancellation for Full Duplex Wireless Communication written by Sanjay Avasarala and published by . This book was released on 2016 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: Traditional wireless communication systems operate in duplexed modes i.e. using time division duplexing or frequency division duplexing. These methods can respectively emulate full duplex mode operation or realize full duplex mode operation with decreased spectral efficiency. This thesis presents a novel method of achieving full duplex operation by actively cancelling out the transmitted signal in pseudo-real time. With appropriate hardware, the algorithms and techniques used in this work can be implemented in real time without any knowledge of the channel or any training sequence. Convergence times of down to 1 ms can be achieved which is adequate for the coherence bandwidths associated with an indoor environment. By utilizing adaptive cancellation, additional overhead for re-calibrating the system in other open-loop methods is not needed.
Book Synopsis Self Interferometry by : Dinesh Bharadia
Download or read book Self Interferometry written by Dinesh Bharadia and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Wireless radios are typically half-duplex radios, and hence, the current wireless networks are Time Division Duplex(TDD) or Frequency Division Duplex (FDD). Full-duplex for wireless communications is considered impossible i.e. radios cannot transmit and receive at the same frequency at the same time. If we could achieve full duplex radios we won't need TDD or FDD strategy, we could potentially double the spectral efficiency. The fundamental challenge in achieving full duplex radios, when a radio is transmitting while simultaneously trying to receive (hear another radio) on the same frequency, it cannot. It's own transmission acts as a very strong self-interference. In this dissertation, we present the design, prototype and implementation of full duplex mimo radios. In particular, we built the first single antenna per chain full-duplex MIMO radios for 2.4 GHz WiFi-PHY i.e. to achieve an m-chain MIMO transceiver we need only m antenna. We design novel cancellation algorithms and circuits that reduce all self-interference to the noise floor and enable full-duplex MIMO PHY with almost no loss. The cancellation algorithms designed for full duplex themselves are of independent interest and apply to many other interference problems in wireless. We exploit this to build a full duplex relay which is the first one to provide both range extension and increase the capacity, is oblivious to ongoing transmission the source and the destination don't even realise that relay exist. Further, we build on top of the cancellation BackFi; a system that provides high throughput connectivity using backscatter to IoT devices at a very lower power. BackFi backscatters all ubiquitous ongoing WiFi signals to provide connectivity. Thus, providing connectivity without using extra spectrum just leveraging full duplex link. The cancellation, in essence, cancels all the reflections from the environment of self transmitted signal, inferring the reflection from cancellation provides us information about the environment. Towards the end, we abstract this information with a platform of Self-Interferometry, which provides with a unique way of looking at environment using wireless signals instead of light. Thus building a camera with wireless radios.
Book Synopsis Self-interference Cancellation for Full-duplex Wireless Communication Systems by : Ahmed Masmoudi
Download or read book Self-interference Cancellation for Full-duplex Wireless Communication Systems written by Ahmed Masmoudi and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Full-duplex operation for wireless communications can potentially double the spectral efficiency, compared to half-duplex operation, by using the same wireless resource to transmit and receive at the cost of a large power difference between the high-power self-interference (SI) from its own transmitted signal and the low-power intended signal received from the other distant transceiver. The SI can be gradually reduced by a combination of radiofrequency (RF) and baseband cancellation stages. Each stage requires the estimation of the different distortions that the SI endures such as the SI channel and the transceiver nonlinearities. This thesis deals with the development of SI-cancellation techniques that are well-adapted to the full-duplex operation.First, we recognize the sparseness of the SI channel and exploit it to develop a compressedsensing (CS) based SI channel estimator. The obtained estimate is used to reduce the SI at the RF prior to the receiver low-noise amplifier and analog-to- digital converter to avoid overloading them. To further reduce the SI, a subspace-based algorithm is developed to jointly estimate the residual SI channel, the intended channel between the two transceivers and the transmitter nonlinearities for the baseband cancellation stage. Including the unknown received intended signal in the estimation process represents the main advantage of the proposed algorithm compared to previous data-aided estimators that assume the intended signal as additive noise. By using the second-order statistics of the received signal, it is possible to obtain the noise subspace and then to estimate the different coefficients without knowing the intended signal. Depending on the number of transmit and receive antennas, we propose to use either the received signal or a combination of the received signal and its complex conjugate. Also, we develop a semi-blind maximum likelihood (ML) estimator that combines the known pilot and unknown data symbols from the intended transceiver to formulate the likelihood function. A closed-form expression of the ML solution is first derived, and an iterative procedure is developed to further improve the estimation performance at moderate to high signal-to-noise ratio. Simulations show significant improvement in SI-cancellation gain compared to the data-aided estimators. Moreover, we present two new SI-cancellation methods using active signal injection (ASI) for full-duplex MIMO-OFDM systems. The ASI approach adds an appropriate cancelling signal to each transmitted signal such that the combined signals from transmit antennas attenuate the SI at the receive antennas. In the first method, the SI-pre-cancelling signal uses some reserved subcarriers which do not carry data. In the second method, the constellation points are dynamically extended within the constellation boundary in order to minimize the received SI. Thus, the SI-pre-cancelling signal does not affect the data-bearing signal. Simulation results show that the proposed methods considerably reduce the SI at a modest computational complexity." --
Book Synopsis Self-Interference Cancellation in Full-duplex Communication Systems by : Ruozhu Li
Download or read book Self-Interference Cancellation in Full-duplex Communication Systems written by Ruozhu Li and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Full-duplex (FD) wireless communications can potentially double the spectral efficiency by transmitting and receiving simultaneously over the same frequency at a cost of a large power difference between the high-power self-interference (SI), and the low-power intended signal received from the remote transmitter. SI can be reduced gradually by a combination of radio-frequency (RF) and baseband SI-cancellation stages. Each stage requires the estimation of various distortions that the SI endures, such as SI-channel and transceiver nonlinearities. This thesis deals with the development of SI-cancellation techniques that are well adapted to FD operations.We address SI-cancellation for FD operations in the presence of imperfect RF components. In particular, we develop a new scheme to jointly estimate the IQ mixer imbalance, power amplifier (PA) nonlinearities, up-/down-conversion phase-noise and SI-channel. First, we study and develop a baseband model that captures the most significant transceiver RF imperfections, for both separate- and common-oscillator structures used in the up- and down-conversions. A basis expansion model (BEM) is then derived to approximate the time-varying phase-noise, and to transform the problem of estimating the time-varying phase-noise into the estimation of a set of static coefficients. Using the method of maximum likelihood (ML) criterion, the likelihood function is derived in the presence of the unknown intended signal, which leads to the joint estimation of the intended channel, the SI-channel, the nonlinear impairments and the phase-noise. When the intended signal is unknown, an iterative procedure is developed to find the ML estimate of the different parameters based on its own known transmitted data, the known pilot symbols, and the statistic of the unknown intended signal received from the intended transmitter. We consider the two pilot-insertion structures used in LTE for the frequency-multiplexed pilots and the time-multiplexed pilots. Compared to training-based techniques, the full use of the received signal significantly reduces the required number of pilot symbols. Simulation results indicate that the proposed algorithms can offer a superior SI-cancellation performance, with the resulting signal-to-SI-and-noise ratio (SINR) being very close to the signal-to-noise ratio (SNR).Moreover, we study the power of SI after each cancellation stage, taking into account the transceiver impairments. One SI-cancellation scheme, which combines antenna cancellation, RF cancellation and digital cancellation, provides results from real world experiments that show the feasibility of an FD design. In general, it is difficult to assess the exact level of the SI reduction that is obtainable due to the interactions among factors such as transceiver impairments, wireless propagation channel and estimation error. We hereby identify the main factors that affect the cancellation performance. This allows for a better understanding of the obtained performance, and leads to the development of new methods that improves the cancellation capability of FD systems. We address the impact of each transceiver impairment in FD systems, and specify the limiting factors of the RF and baseband SI-cancellation stages for a given architecture. In addition, we demonstrate that reducing the SI before the LNA/ADC, via the RF SI-cancellation stage is necessary to avoid high quantization noise from the ADC. The analysis further reveals that the transmitter nonlinearities need to be modeled and canceled in the baseband SI-cancellation stage. Finally, in light of our simulation results, we discuss the trade-off between the amount of SI-cancellation and the number of cancellation stages, and propose the potential case scenarios for operations with one digital cancellation." --
Book Synopsis Self-interference Cancellation in Full-duplex Wireless Systems by : Elsayed Ahmed Elsayed Ahmed
Download or read book Self-interference Cancellation in Full-duplex Wireless Systems written by Elsayed Ahmed Elsayed Ahmed and published by . This book was released on 2014 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to the tremendous increase in wireless data traffic, one of the major challenges for future wireless systems is the utilization of the available spectrum to achieve better data rates over limited spectrum. Currently, systems operate in what is termed "Half Duplex Mode," where they are either transmitting or receiving, but never both using the same temporal and spectral resources. Full-duplex transmission promises to double the spectral efficiency where bidirectional communications is carried out over the same temporal and spectral resources. The main limitation impacting full-duplex transmission is managing the strong self-interference signal imposed by the transmit antenna on the receive antenna within the same transceiver. Several recent publications have demonstrated that the key challenge in practical full-duplex systems is un-cancelled self-interference power caused by a combination of hardware imperfections, especially Radio Frequency (RF) circuits' impairments. In this thesis, we consider the problem of self-interference cancellation in full-duplex systems. The ultimate goal of this work is to design and build a complete, real-time, full-duplex system that is capable of achieving wireless full-duplex transmission using practical hardware platforms. Since RF circuits' impairments are shown to have significant impact on the self-interference cancellation performance, first, we present a thorough analysis of the effect of RF impairments on the cancellation performance, with the aim of identifying the main performance limiting factors and bottlenecks. Second, the thesis proposes several impairments mitigation techniques to improve the overall self-interference cancellation capability by mitigating most of the transceiver RF impairments. In addition to impairments mitigation, two novel full-duplex transceiver architectures that achieve significant self-interference cancellation performance are proposed. The performance of the proposed techniques is analytically and experimentally investigated in practical wireless environments. Finally, the proposed self-interference cancellation techniques are used to build a complete full-duplex system with a 90\% experimentally proven full-duplex rate improvement compared to half-duplex systems.
Book Synopsis Self-interference Cancellation in Full-duplex Radio by : Yifan Li
Download or read book Self-interference Cancellation in Full-duplex Radio written by Yifan Li and published by . This book was released on 2017 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: With fast increasing demand of the wireless network, the current spectrum used for commercial wireless communication becomes very crowed. So it is critical to find an more efficient way to make the limited spectrum provide larger capacity and throughput. Full-duplex communication technology has caused much attention in the past ten years since it can double the spectrum efficiency theoretically. While the main challenge obstructing it promoting into the market is the self-interference problem in a full duplex system. This dissertation focus on the self-interference cancellation (SIC) theories. The RF impairments occurred in the practical full-duplex system will be discussed. Among them, the phase noise and I/Q imbalance are regarded as the bottleneck of the self-interference cancellation and a detailed analyzing will be included in this dissertation. The general self-interference cancellation methods can be divided into passive self-interference cancellation and active self-interference cancellation where the active cancellation can be further divided into digital cancellation, analog cancellation and hybrid cancellation. This dissertation will review the theories of the passive and active self-interference cancellation. For the analog cancellation, two models (quadratic model and affine model) will be explored to handle the I/Q imbalance and phase noise. Both of these two models are based on the blind tuning algorithm which has two procedures: training and optimizing. This dissertation will introduce the development of the algorithm. It contains the computer simulation results as well as the hardware experimental results to prove the validation of the proposed ideas.
Book Synopsis Signal Processing for 5G by : Fa-Long Luo
Download or read book Signal Processing for 5G written by Fa-Long Luo and published by John Wiley & Sons. This book was released on 2016-10-17 with total page 611 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive and invaluable guide to 5G technology, implementation and practice in one single volume. For all things 5G, this book is a must-read. Signal processing techniques have played the most important role in wireless communications since the second generation of cellular systems. It is anticipated that new techniques employed in 5G wireless networks will not only improve peak service rates significantly, but also enhance capacity, coverage, reliability , low-latency, efficiency, flexibility, compatibility and convergence to meet the increasing demands imposed by applications such as big data, cloud service, machine-to-machine (M2M) and mission-critical communications. This book is a comprehensive and detailed guide to all signal processing techniques employed in 5G wireless networks. Uniquely organized into four categories, New Modulation and Coding, New Spatial Processing, New Spectrum Opportunities and New System-level Enabling Technologies, it covers everything from network architecture, physical-layer (down-link and up-link), protocols and air interface, to cell acquisition, scheduling and rate adaption, access procedures and relaying to spectrum allocations. All technology aspects and major roadmaps of global 5G standard development and deployments are included in the book. Key Features: Offers step-by-step guidance on bringing 5G technology into practice, by applying algorithms and design methodology to real-time circuit implementation, taking into account rapidly growing applications that have multi-standards and multi-systems. Addresses spatial signal processing for 5G, in particular massive multiple-input multiple-output (massive-MIMO), FD-MIMO and 3D-MIMO along with orbital angular momentum multiplexing, 3D beamforming and diversity. Provides detailed algorithms and implementations, and compares all multicarrier modulation and multiple access schemes that offer superior data transmission performance including FBMC, GFDM, F-OFDM, UFMC, SEFDM, FTN, MUSA, SCMA and NOMA. Demonstrates the translation of signal processing theories into practical solutions for new spectrum opportunities in terms of millimeter wave, full-duplex transmission and license assisted access. Presents well-designed implementation examples, from individual function block to system level for effective and accurate learning. Covers signal processing aspects of emerging system and network architectures, including ultra-dense networks (UDN), software-defined networks (SDN), device-to-device (D2D) communications and cloud radio access network (C-RAN).
Book Synopsis RF Imperfections in High-rate Wireless Systems by : Tim Schenk
Download or read book RF Imperfections in High-rate Wireless Systems written by Tim Schenk and published by Springer Science & Business Media. This book was released on 2008-01-29 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is one of the first books on the emerging research topic of digital compensation of RF imperfections. The book presents a new multidisciplinary vision on the design of wireless communication systems. In this approach the imperfections of the RF front-ends are accepted and digital signal processing algorithms are designed to suppress their impact on system performance. The book focuses on multiple-antenna orthogonal frequency division multiplexing (MIMO OFDM).
Book Synopsis Full-Duplex Communications and Networks by : Lingyang Song
Download or read book Full-Duplex Communications and Networks written by Lingyang Song and published by Cambridge University Press. This book was released on 2017-03-02 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: Learn about the key technologies and state of the art in research for full-duplex communications with this comprehensive guide.
Book Synopsis Full-duplex Wireless Communication Duplexing Scheme: Methodology and Self-interference Characteristics by : Ramez Askar
Download or read book Full-duplex Wireless Communication Duplexing Scheme: Methodology and Self-interference Characteristics written by Ramez Askar and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Full-Duplex Communications and Networks by : Lingyang Song
Download or read book Full-Duplex Communications and Networks written by Lingyang Song and published by Cambridge University Press. This book was released on 2017-03-02 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: Learn about the key technologies and understand the state of the art in research for full-duplex communication networks and systems with this comprehensive and interdisciplinary guide. Incorporating physical, MAC, network, and application layer perspectives, it explains the fundamental theories on which full-duplex communications are built, and lays out the techniques needed for network design, analysis and optimization. Techniques covered in detail include self-interference cancellation and signal processing algorithms, physical layer algorithms, methods for efficient resource allocation, and game theory. Potential applications and networking schemes are discussed, including full-duplex cognitive radio networks, cooperative networks, and heterogeneous networks. The first book to focus exclusively on full-duplex communications, this is an indispensable reference for both researchers and practitioners designing the next generation of wireless networks.
Book Synopsis Self-interference Cancellation in Full Duplex Radios and LTE-unlicensed by : Chaitanya Umesh Mauskar
Download or read book Self-interference Cancellation in Full Duplex Radios and LTE-unlicensed written by Chaitanya Umesh Mauskar and published by . This book was released on 2016 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: Currently deployed cellular networks use bands which have been licensed and approved by the FCC. With the developments in cellular standards Rel-10 LTE advanced which supports carrier aggregation has been established where a multiple carriers are aggregated to provide a larger bandwidth. As cellular operators explore the possibility of extending the carrier aggregation to the unlicensed spectrum in the 5GHz, current developments in creating a friendly ecosystem in unlicensed bands have been summarized which form the basis of Rel-13 LTE- Licensed Assisted Access.
Book Synopsis Self-interference Handling in OFDM Based Wireless Communication Systems by : Tevfik Yücek
Download or read book Self-interference Handling in OFDM Based Wireless Communication Systems written by Tevfik Yücek and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation scheme that provides efficient bandwidth utilization and robustness against time dispersive channels. This thesis deals with self-interference, or the corruption of desired signal by itself, in OFDM systems. Inter-symbol Interference (ISI) and Inter-carrier Interference (ICI) are two types of self-interference in OFDM systems. Cyclic prefix is one method to prevent the ISI which is the interference of the echoes of a transmitted signal with the original transmitted signal. The length of cyclic prefix required to remove ISI depends on the channel conditions, and usually it is chosen according to the worst case channel scenario. Methods to find the required parameters to adapt the length of the cyclic prefix to the instantaneous channel conditions are investigated.
Book Synopsis Proceedings of the 1st International Congress on Engineering Technologies by : Suhil Kiwan
Download or read book Proceedings of the 1st International Congress on Engineering Technologies written by Suhil Kiwan and published by CRC Press. This book was released on 2021-09-30 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first volume in the Mosharaka for Research and Studies International Conference Proceedings series (P-MIC) contains peer-reviewed papers presented at the 1st International Congress on Engineering Technologies (EngiTek 2020). This event was held remotely on 16-18 June 2020, and hosted by the Faculty of Engineering, Jordan University of Science & Technology (Irbid, Jordan). The conference represented a major forum for professors, students, and professionals from all over the world to present their latest research results, and to exchange new ideas and practical experiences in the most cutting-edge areas of the field of engineering technologies. Topics covered include electrical engineering, computer science and electronics.
Book Synopsis Self-interference Cancellation in Full-Duplex Radio by :
Download or read book Self-interference Cancellation in Full-Duplex Radio written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
