Full Duplex CMOS Transceiver with On-chip Self-interference Cancelation
Full Duplex CMOS Transceiver with On-chip Self-interference Cancelation

Author: Seyyed Amir Ayati

Publisher:

Published: 2017

Total Pages: 0

ISBN-13:

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The demand for the higher data rate in the wireless telecommunication is increasing rapidly. Providing higher data rate in cellular telecommunication systems is limited because of the limited physical resources such as telecommunication frequency channels. Besides, interference with the other users and self-interference signal in the receiver are the other challenges in increasing the bandwidth of the wireless telecommunication system. Full duplex wireless communication transmits and receives at the same time and the same frequency which was assumed impossible in the conventional wireless communication systems. Full duplex wireless communication, compared to the conventional wireless communication, doubles the channel efficiency and bandwidth. In addition, full duplex wireless communication system simplifies the reusing of the radio resources in small cells to eliminate the backhaul problem and simplifies the management of the spectrum. Finally, the full duplex telecommunication system reduces the costs of future wireless communication systems. The main challenge in the full duplex wireless is the self-interference signal at the receiver which is very large compared to the receiver noise floor and it degrades the receiver performance significantly. In this dissertation, different techniques for the antenna interface and self-interference cancellation are proposed for the wireless full duplex transceiver. These techniques are designed and implemented on CMOS technology. The measurement results show that the full duplex wireless is possible for the short range and cellular wireless communication systems.

Self-interference Cancellation in Full-duplex Wireless Systems
Self-interference Cancellation in Full-duplex Wireless Systems

Author: Elsayed Ahmed Elsayed Ahmed

Publisher:

Published: 2014

Total Pages: 173

ISBN-13: 9781321300895

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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.

Millimeter-Wave Circuits for 5G and Radar
Millimeter-Wave Circuits for 5G and Radar

Author: Gernot Hueber

Publisher: Cambridge University Press

Published: 2019-06-20

Total Pages: 455

ISBN-13: 1108492789

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Discover the concepts and techniques needed to design millimeter-wave circuits for current and emerging wireless system applications.

Full-Duplex Communications for Future Wireless Networks
Full-Duplex Communications for Future Wireless Networks

Author: Hirley Alves

Publisher: Springer Nature

Published: 2020-04-21

Total Pages: 323

ISBN-13: 9811529698

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This book focuses on the multidisciplinary state-of-the-art of full-duplex wireless communications and applications. Moreover, this book contributes with an overview of the fundamentals of full-duplex communications, and introduces the most recent advances in self-interference cancellation from antenna design to digital domain. Moreover, the reader will discover analytical and empirical models to deal with residual self-interference and to assess its effects in various scenarios and applications. Therefore, this is a highly informative and carefully presented book by the leading scientists in the area, providing a comprehensive overview of full-duplex technology from the perspective of various researchers, and research groups worldwide. This book is designed for researchers and professionals working in wireless communications and engineers willing to understand the challenges and solutions full-duplex communication so to implement a full-duplex system.

Self-interference Cancellation in Full-duplex Radio
Self-interference Cancellation in Full-duplex Radio

Author: Yifan Li

Publisher:

Published: 2017

Total Pages: 106

ISBN-13: 9781369833393

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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.

On Design Concept for Full-duplex Based Flexible Radio Transceivers
On Design Concept for Full-duplex Based Flexible Radio Transceivers

Author: Zhaowu Zhan

Publisher:

Published: 2014

Total Pages: 136

ISBN-13:

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The wireless medium is a shared and limited resource. Current wireless standards always share the medium with Half-Duplex principle: the transmission and reception of signals are done in two separate time slots or two different frequency bands. Besides, the transceiver can only transmit and receive one signal at a time. This dissertation takes an alternate approach: Instead of sharing the medium with Half-Duplex principle, the entire licensed frequency band is shared for simultaneous transmission and reception, which we call Full-Duplex. Besides, the design concept for a wideband flexible radio transceiver can process two different types of signals at a time. To approach this goal, we use an active analog radio frequency self-interference cancellation (AARFSIC) method or a combination scheme of the AARFSIC and active digital self interference cancellation in time domain (ADSICT) to cancel the strong self-interference (SI) induced by the Full-Duplex principle. Based on the Full-Duplex radio, we propose a flexible Full-Duplex Dual-Band (FDDB) OFDM radio transceiver by combining it with a Dual-Band RF front-end. Building on these, we make three main contributions: We present an active self-interference cancellation (ASIC) scheme, which can cancel both the strong one-path and multi-path SI completely, based on the combination of the AARFSIC and DSICT. Next, we introduce the design and evaluation of a Full-Duplex OFDM radio, including the analysis and qualification of the impact of the thermal noise and phase noise on the system performance. Finally, we develop a FDDB OFDM radio that can work on two separate spectrum fragments. In order to eliminate the impact of the I/Q imbalance on the FDDB radio, a simple but practical digital I/Q imbalance estimation and compensation method is presented. The system level simulation conducted with ADS and Matlab software shows that this method can effectively compensate both high and low I/Q imbalance.

Enhanced Transceiver Performance Through Self-interference Cancellation in Multiple Modalities
Enhanced Transceiver Performance Through Self-interference Cancellation in Multiple Modalities

Author: Thien-An Ngoc Nguyen

Publisher:

Published: 2018

Total Pages: 322

ISBN-13:

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Interference in front end transceivers directly impact system performance by saturating receiver circuitry and generating non-linearities. While proper shielding can effectively eliminate external interference, self-interference continues to limit the performance of sensing and communication systems today. Self-interference exists when the transmitted signal interferes with the received signal through parasitic signal paths and from spurious reflections. This dissertation explores the use of novel transducers, front-end designs, and active cancellers to eliminate self-interference in multiple sensing and communication modalities: acoustic, optical, and electronics. First, we demonstrate integration of electroadhesion with a piezoelectric multimaterial fiber transducer to reduce acoustic signal reflection at the interface with the target substrate. The large acoustic impedance of air introduces a 105 mismatch with the acoustic transducer and the substrate. By monolithically integrating electroadhesive and acoustic functions into a single fiber device, the fiber transducer can controllably adhere to the target and subsequently eliminate the interfacial air microvoids during operation. Second, the limited directivity of optical circulators give rise to parasitic signal paths in optical Mach-Zehdner based laser Doppler vibrometers. Parasitic signal paths are signal paths in an interferometer which are unexpected and unbalanced with respect to the signal and reference arms. The path length imbalance demodulates laser phase noise as amplitude noise at the receiver which degrades sensitivity due to the decrease in signal to noise ratio. We derive an expression for this this parasitic phase induced intensity noise (P-PIIN) and develop a new interferometer design which enables mutually balanced signal, reference, and dominant parasitic paths to achieve 90 dB of signal to noise ratio and femtometer vibration sensitivity. Third, self-interference in modern electronic communication systems limit the maximum achievable throughput in a given bandwidth. Self-interference from both parasitic signal paths and spurious reflections overwhelms the significantly weaker receive signal when both are operating simultaneously. As such, communication systems such as cable only operate either in time domain duplexing (alternate between transmitting and receiving) or frequency domain duplexing (transmit and receive on different frequencies) modes. By actively eliminating self-interference, communication systems are able to send and receive information at the same time on the same frequency: full duplex operation.

CMOS Wireless Transceiver Design
CMOS Wireless Transceiver Design

Author: Jan Crols

Publisher: Springer Science & Business Media

Published: 2013-06-29

Total Pages: 249

ISBN-13: 1475747845

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The world of wireless communications is changing very rapidly since a few years. The introduction of digital data communication in combination with digital signal process ing has created the foundation for the development of many new wireless applications. High-quality digital wireless networks for voice communication with global and local coverage, like the GSM and DECT system, are only faint and early examples of the wide variety of wireless applications that will become available in the remainder of this decade. The new evolutions in wireless communications set new requirements for the trans ceivers (transmitter-receivers). Higher operating frequencies, a lower power consump tion and a very high degree of integration, are new specifications which ask for design approaches quite different from the classical RF design techniques. The integrata bility and power consumption reduction of the digital part will further improve with the continued downscaling of technologies. This is however completely different for the analog transceiver front-end, the part which performs the interfacing between the antenna and the digital signal processing. The analog front-end's integratability and power consumption are closely related to the physical limitations of the transceiver topology and not so much to the scaling of the used technology. Chapter 2 gives a detailed study of the level of integration in current transceiver realization and analyzes their limitations. In chapter 3 of this book the complex signal technique for the analysis and synthesis of multi-path receiver and transmitter topologies is introduced.