Performance Analysis Of Amplify And Forward Wireless Relay Networks
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Performance Analysis Of Amplify And Forward Wireless Relay Networks
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Author : Muhammad Khalil
language : en
Publisher:
Release Date : 2017
Performance Analysis Of Amplify And Forward Wireless Relay Networks written by Muhammad Khalil and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Bit error rate categories.
Wireless relay technology plays an important role in the next-generation mobile and wireless networks. It has been proposed as a cost effective solution to addressing a growing demand for high data rates and low power consumption. In the relay communication model, a source communicates to a destination through a wireless node(s) called a relay. There are two main relaying techniques: Decode-and-Forward (DF) and Amplify-and-Forward (AF). AF is the focus of this thesis. The AF relay networks provide considerable performance improvement in link reliability, Spectral Efficiency (SE), Energy Efficiency (EE) and Bit Error Rate (BER) performance. They also offer a low-complexity solution for practical relay networks that have critical energy constraints, as they enable the received signal to be amplified without the decoding process at the relays. This thesis proposes new methods of reducing the energy consumption and evaluating the error performance of AF relay networks, when the relay is either one-way (unidirectional) or two-way (bidirectional). The analysis is commenced by formulating the actual Signals-to-Noise Ratio (SNR) level, which corresponds to a low SNR level, in order to calculate the Exact Bit Error Rate (EBER) performance. Then, the approximated SNR, which refers to a high SNR level, is expressed and adopted to evaluate the Asymptotic Bit Error Rate (ABER). Another SNR level is presented in this work and defined as an optimal SNR level, which is obtained by optimal balancing of the SE and EE. The optimal SNR level allows evaluation of the ABER and the EBER of AF relay networks under optimal SNR conditions. Accordingly, a unifying BER evaluation at low, high, and optimal levels of AF relay networks is provided in this study. This thesis focuses on a high SNR level to derive an effective method for evaluating the ABER and EBER, whether in optimal or sub-optimal AF relay networks. The effectiveness of such a BER evaluation method is demonstrated by enhancing the ABER of AF relay networks at all SNR levels (i.e., low, high, optimal SNR levels). This is shown when disparity between the ABER and the EBER at a low SNR level is reduced, and this helps to calculate the accurate BER of AF relay networks under any SNR levels using either the ABER or EBER. The proposed methods are examined under different channels environments, as in practice the channel of each hop of an AF relay network can be located in a different environment. When both hops are located in the same environment, the fading channels of the hops are equal, while for different environments, the fading channels of the hops are different. Furthermore, relay location is also investigated for the aforementioned ABER and EBER, and a new method for determining the relationship between the EE and EBER with relay location is derived.
Amplify And Forward Relaying In Wireless Communications
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Author : Leonardo Jiménez Rodríguez
language : en
Publisher: Springer
Release Date : 2015-05-22
Amplify And Forward Relaying In Wireless Communications written by Leonardo Jiménez Rodríguez and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-05-22 with Computers categories.
This SpringerBrief explores the advantage of relaying techniques in addressing the increasing demand for high data rates and reliable services over the air. It demonstrates how to design cost-effective relay systems that provide high spectral efficiency and fully exploit the diversity of the relay channel. The brief covers advances in achievable rates, power allocation schemes, and error performance for half-duplex (HD) and full-duplex (FD) amplify-and-forward (AF) single-relay systems. The authors discuss the capacity and respective optimal power allocation for a wide range of HD protocols over static and fading channels. Then, optimal amplification coefficients in terms of achievable rate are presented. Chapters also examine performance with finite constellations, including the error and diversity performance. The brief concludes with a capacity and error performance analysis of the FD relay mode of operation, where the residual self-interference due to FD transmission is explicitly taken into account. Amplify-and-Forward Relaying in Wireless Communications reveals the benefits and challenges of relaying techniques. It is designed for researchers and professionals in wireless communication. This material is also appropriate for advanced-level students in electrical engineering and computer science.
Lifetime Analysis And Improvement Of An Amplify And Forward Wireless Relay Network
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Author : Shuotong Li
language : en
Publisher:
Release Date : 2014
Lifetime Analysis And Improvement Of An Amplify And Forward Wireless Relay Network written by Shuotong Li and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Signal Processing And Performance Analysis Techniques For Relay Networks In The Presence Of I Q Imbalance
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Author : Mohamed Mokhtar Gaber Moursi Awadin
language : en
Publisher:
Release Date : 2014
Signal Processing And Performance Analysis Techniques For Relay Networks In The Presence Of I Q Imbalance written by Mohamed Mokhtar Gaber Moursi Awadin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Radio frequency modulation categories.
We analyze the outage performance of half-duplex amplify-and-forward relaying in an orthogonal frequency division multiplexing (OFDM) system with maximum ratio combining (MRC) detection in the presence of inphase (I) and quadrature (Q) branches imbalance (IQI) and compare it with that of the direct transmission mode. Both analytical and numerical results demonstrate that the direct mode can outperform the amplify-and-forward mode even under moderate levels of uncompensated IQI. The cross-over IQI levels are determined analytically to be inversely proportional to the cube of the signal constellation size. In addition, we present a low-complexity receiver-based digital baseband IQI compensation scheme for the amplify-and-forward mode and analyze its error vector magnitude (EVM) performance. Furthermore, we derive accurate analytical approximations for the EVM performance as a function of the relay location and IQI level with and without compensation. Next, we study the outage performance of orthogonal frequency-division multiplexing dual-hop opportunistic amplify-and-forward relaying in the presence of IQI in all nodes. We derive a closed-form expression for the end-to-end outage probability for the general case where each node suffers from a different IQI level and assuming that the distance between source and relay is not the same for all relays. Furthermore, we consider the more general case where there is a direct link between the source and the destination, and we derive a closed-form expression for the end-to-end outage probability for both maximum-ratio and selection combining at the destination. To gain more insights, we analyze a special case where all relays lie on the perpendicular line midway between source and destination and all nodes experience the same IQI level. Our simulations show excellent match to the analytical results and both demonstrate that uncompensated IQI can be detrimental but it can also be effectively mitigated using a few opportunistic relays. Finally, we analyze the outage probability of dual-hop full-duplex decode-and-forward relaying for an orthogonal frequency division multiplexing system in the presence of IQI. We derive accurate analytical approximations which quantify the outage probability's functional dependence on the IQI level and the residual loopback self-interference average power level. Moreover, we derive the condition at which direct transmission outperforms full-duplex decode-and-forward relay-assisted transmission in the presence of IQI. Furthermore, we propose an opportunistic relaying approach and demonstrate its robustness against the detrimental effects of IQI and residual loopback self-interference. Our numerical results confirm the accuracy of our analysis.
Ofdm Based Relay Systems For Future Wireless Communications
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Author : Milica Pejanovic-Djurisic
language : en
Publisher: CRC Press
Release Date : 2022-09-01
Ofdm Based Relay Systems For Future Wireless Communications written by Milica Pejanovic-Djurisic and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-09-01 with Science categories.
Relay systems have become a subject of intensive research interest over the recent years, as it is recognized that they can improve performances and extend the coverage area of wireless communication systems. Special attention has been dedicated to them since the proposal appeared for their implementation in mobile cellular systems. Numerous researches conducted after that proposal have enabled incorporation of OFDM based relay systems in both accepted standards for IMT-Advanced systems. Nowadays, researches are ongoing with the aim to define new solutions for performance improvement of the standardized OFDM relay systems for cellular networks and one of the interesting solutions is implementation of subcarrier permutation (SCP) at the relay (R) station.The book OFDM based relay systems for future wireless communications presents a comprehensive research results in analyzing behavior and performance of the OFDM based relay systems with SCP. Dual-hop relay scenario with three communication terminals, and no direct link between the source (S) and the destination (D) has been analyzed, as it is compliant with the accepted solutions for IMT-Advanced systems. The book includes performance analysis and performance comparison of OFDM based:• amplify-and-forward (AF) relay systems with fixed gain (FG),• amplify-and-forward (AF) relay systems with variable gain (VG),• decode-and-forward (DF) relay systems,each including two SCP schemes, known to maximize the system capacity and/or improve the bit error rate (BER) performances. Performance comparisons have enabled definition of optimal solutions for the future wireless communication systems in a given conditions, and for the given optimality criteria. OFDM based relay systems for future wireless communications contains recent research results in this area and is ideal for the academic staff and master/research students in area of mobile communication systems, as well as for the personnel in communication industry.
Emerging Trends In Ict Security
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Author : Annamalai Annamalai
language : en
Publisher: Elsevier Inc. Chapters
Release Date : 2013-11-06
Emerging Trends In Ict Security written by Annamalai Annamalai and has been published by Elsevier Inc. Chapters this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-06 with Computers categories.
Wireless physical layer security approaches can prevent eavesdropping without upper layer data encryption. However, such techniques are hampered by time-varying wireless channel conditions and they are typically feasible only when the legitimate partners in the Wyner’s wire-tap channel model have an advantage over the source-eavesdropper channels. Node cooperation is an effective strategy to overcome this challenge and enhance the performance of secure wireless communications. This chapter addresses secure wireless communications of a source-destination pair with the help of multiple cooperating amplify-and-forward relays in the presence of one or more eavesdroppers. The role of channel fading is characterized in terms of average (ergodic) secure communication rates. Overall, this work establishes the utility of node cooperation for improving secure wireless communications and provides a unified analytical framework for assessing the ergodic secrecy rates of cooperative amplify-and-forward relay networks in a generalized fading environment with independent but non-identically distributed channel fading statistics.
Power Distribution And Performance Analysis For Wireless Communication Networks
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Author : Dongmei Zhao
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-02-25
Power Distribution And Performance Analysis For Wireless Communication Networks written by Dongmei Zhao and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-02-25 with Computers categories.
This book provides an analysis of transmission power and network performance in different wireless communication networks. It presents the latest research and techniques for power and interference control and performance modeling in wireless communication networks with different network topologies, air interfaces, and transmission techniques. While studying the power distributions and resource management, the reader will also learn basic methodology and skills for problem formulations, can ascertain the complexity for designing radio resource management strategies in modern wireless communication networks, thus keeping pace with state-of-the-art research progress in radio transmission technologies.
Design And Analysis Of New Wireless Transmission Strategies For Cooperative Relay Networks
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Author : Gayan Lasintha Amarasuriya Aruma Baduge
language : en
Publisher:
Release Date : 2013
Design And Analysis Of New Wireless Transmission Strategies For Cooperative Relay Networks written by Gayan Lasintha Amarasuriya Aruma Baduge and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Antennas (Electronics) categories.
Cooperative relay technologies are currently being researched to address the ever-increasing demand for higher data rates, extended coverage, greater mobility, and enhanced reliability. This thesis thus focuses on (1) developing new physical-layer wireless technologies for cooperative relay networks and (2) ascertaining their viability through performance analysis. Specifically, (i) new system and channel models, (ii) signaling and relay-processing algorithms, (iii) joint relay-antenna selection strategies, (iv) joint transmit-receive beamforming techniques, and (v) comprehensive performance analysis frameworks are developed for one-way, two-way, and multi-way cooperative relay networks. Our first research focuses on developing a comprehensive analytical framework for deriving closed-form performance bounds of multi-hop amplify-and-forward (AF) relay networks. Specifically, mathematically-tractable, asymptotically-exact end-to-end signal-to-noise ratio bounds are first formulated, and thereby, the outage probability and average bit error rate bounds are derived. In our second work, adaptive multiple-relay selection strategies are designed and analyzed for multi-relay AF networks to optimize the tradeoffs among the system performance, complexity, and wireless resource usage. Our third research investigates joint antenna and relay selection strategies, which are optimal in the sense of the achievable diversity gains, for multiple-input multiple-output (MIMO) one-way relay networks and MIMO two-way relay networks. Finally, joint transmit/receive zero forcing transmission strategies are developed for MIMO multi-way relay networks for optimizing the achievable diversity-multiplexing trade-off. The key design criterion of the aforementioned transmission designs is to leverage spatial diversity and/or spatial multiplexing gains available among distributed single-antenna and/or multiple-antenna wireless terminals through distributed transmission and efficient signal processing. Moreover, the fundamental relationships among the data rate, coverage, and reliability metrics are characterized, and thereby, the detrimental impact of practical wireless transmission impairments on the performance of the aforementioned transmission strategies are quantified. The insights obtained through these analyses are then used to refine our physical-layer designs to achieve desirable trade-offs between the system performance, resource usage and implementation complexity.
Amplify And Forward Relay Performance In Wimax 802 16j
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Author : Jimish Ashok Thakkar
language : en
Publisher:
Release Date : 2009
Amplify And Forward Relay Performance In Wimax 802 16j written by Jimish Ashok Thakkar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
WiMAX has been proven to be a better alternative to the DSL and cable broadband services and also supports point to multipoint and mesh networks. Furthermore, the WiMAX 802.16j Network has been proposed by the relay task group to improve coverage, throughput and cost effectiveness. The WiMAX relay task group has proposed different relaying techniques using various types of relays mainly 'Decode and Forward' and 'Amplify and Forward'. In this thesis, the performance of the two hop relay network has been evaluated using the 'Amplify and Forward Relay' due to the ability of an 'Amplify and forward' relay to provide better performance in short distances with reduction in cost. The effects of placement of the relay station on the performance of the network for different applications were also studied, The two hop network with an "Amplify and forward" relay was successfully evaluated to provide better link quality to users.
Resource Constrained Cooperative Wireless Networks
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Author : Behrouz Maham
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2010
Resource Constrained Cooperative Wireless Networks written by Behrouz Maham and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
In this book, we consider the design of practical distributed space-time codes and power efficient fading mitigation techniques for wireless relay networks. Furthermore, the performance analysis of the wireless relay networks under different protocols and fading channels are investigated. The formulas for the symbol error rate (SER), outage probability, and diversity order of the investigated schemes are presented in fading channels. Based on these SER expressions, power allocations are also introduced to further improve the performance of these systems. The proposed cooperative schemes are next applied to some practical wireless networks. For instance, several amplify-and-forward cooperative schemes are proposed which consider the residual battery energy, as well as the statistical CSI, for the purpose of lifetime maximization in multi-branch, multihop wireless networks. In addition, new energy-efficient cooperative routing protocols are proposed in multihop wireless networks. In contrast to previous works, the proposed cooperating routings depend only on the statistics of the channels, and are implemented by both the centralized and distributed approaches.