Relevant bibliographies by topics / Wireless communication systems. Radio relay systems

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  1. Journal articles
  2. Dissertations / Theses
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  5. Conference papers

Academic literature on the topic 'Wireless communication systems. Radio relay systems'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Wireless communication systems. Radio relay systems"

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Alvi, Shakeel A., Riaz Hussain, Atif Shakeel, Muhammad Awais Javed, Qadeer Ul Hasan, Byung Moo Lee, and Shahzad A. Malik. "QoS-Oriented Optimal Relay Selection in Cognitive Radio Networks." Wireless Communications and Mobile Computing 2021 (April 24, 2021): 1–15. http://dx.doi.org/10.1155/2021/5580963.

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A cognitive radio network can be employed in any wireless communication systems, including military communications, public safety, emergency networks, aeronautical communications, and wireless-based Internet of Things, to enhance spectral efficiency. The performance of a cognitive radio network (CRN) can be enhanced through the use of cooperative relays with buffers; however, this incurs additional delays which can be reduced by using virtual duplex relaying that requires selection of a suitable relay pair. In a virtual duplex mode, we mimic full-duplex links by using simultaneous two half-duplex links, one transmitting and the other one receiving, in such a way that the overall effect of duplex mode is achieved. The relays are generally selected based on signal-to-interference-plus-noise ratio (SINR). However, other factors such as power consumption and buffer capacity can also have a significant impact on relay selection. In this work, a multiobjective relay selection scheme is proposed that simultaneously takes into account throughput, delay performance, battery power, and buffer status (i.e., both occupied and available) at the relay nodes while maintaining the required SINR. The proposed scheme involves the formulation of four objective functions to, respectively, maximize throughput and buffer space availability while minimizing the delay and battery power consumption. The weighted sum approach is then used to combine these objective functions to form the multiobjective optimization problem and an optimal solution is obtained. The assignments of weights to objectives have been done using the rank sum (RS) method, and several quality-of-service (QoS) profiles have been considered by varying the assignment of weights. The results gathered through simulations demonstrate that the proposed scheme efficiently determines the optimal solution for each application scenario and selects the best relay for the respective QoS profile. The results are further verified by using the genetic algorithm (GA) and particle swarm optimization (PSO) techniques. Both techniques gave identical solutions, thus validating our claim.
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Senthamarai, C., and N. Malmurugan. "Efficient Spectral Allocation for Cognitive Full Duplex Relay Network Systems Based Soft Computing Technique." Current Signal Transduction Therapy 15, no. 1 (July 31, 2020): 46–55. http://dx.doi.org/10.2174/1574362413666180831105203.

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Background: Due to the huge development of wireless devices and mobile data traffic had gained attention towards identifying accurate solutions for more proficient utilization of the wireless spectrum. An essential issue confronting the future in wireless systems is to identify the appropriate spectrum bands to satisfy the request of future administrations. While the greater part of the radio spectrum is allocated to various services, applications and users show that spectrum usage is quite low. Materials and Methods: The spectrum sensing is performed at the start of each time slot before the data transmission. As a promising framework to improve the spectrum utilization, Cognitive Radio (CR) technique has the immense potential to meet such a necessity by permitting unlicensed users to exist together in licensed bands. In this paper Cognitive radio and Full-Duplex (FD) based two-way relay communications are developed to enhance spectrum utilization for multichannel and to decrease the false alarm rate. Results: To solve the optimization problems in spectral efficiency, soft computing techniques is proposed to minimize the self-interference and delay to the licensed users. In this proposed work the kurtosis parameter is used for channel detection to determine whether the signal is present or not. Conclusion: The performance results of the proposed method are evaluated in terms of spectral allocation and outage probability which achieves better performance than the existing Multi- Objective Genetic Algorithm (MOGA) optimization.
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Krstic, Dragana, Petar Nikolic, Danijela Aleksic, Sinisa Minic, Dragan Vuckovic, and Mihajlo Stefanovic. "Product of Three Random Variables and its Application in Relay Telecommunication Systems in the Presence of Multipath Fading." Journal of Telecommunications and Information Technology 1 (March 29, 2019): 83–92. http://dx.doi.org/10.26636/jtit.2019.130018.

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In this paper, the product of three random variables (RVs) will be considered. Distribution of the product of independent random variables is very important in many applied problems, including wireless relay telecommunication systems. A few of such products of three random variables are observed in this work: the level crossing rate (LCR) of the product of a Nakagami-m random variable, a Rician random variable and a Rayleigh random variable, and of the products of two Rician RVs and one Nakagami-m RV is calculated in closed forms and presented graphically. The LCR formula may be later used for derivation of average fade duration (AFD) of a wireless relay communication radio system with three sections, working in the multipath fading channel. The impact of fading parameters and multipath fading power on the LCR is analyzed based on the graphs presented.
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Gueye, Ibrahima, Ibra Dioum, Idy Diop, K. Wane Keita, Papis Ndiaye, Moussa Diallo, and Sidi Mohamed Farssi. "Performance of Hybrid RF/FSO Cooperative Systems Based on Quasicyclic LDPC Codes and Space-Coupled LDPC Codes." Wireless Communications and Mobile Computing 2020 (December 30, 2020): 1–15. http://dx.doi.org/10.1155/2020/8814588.

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Free space optical (FSO) communication systems provide wireless line of sight connectivity in the unlicensed spectrum, and wireless optical communication achieves higher data rates compared to their radio frequency (RF) counterparts. FSO systems are particularly attractive for last mile access problem by bridging fiber optic backbone connectivity to RF access networks. To cope with this practical deployment scenario, there has been increasing attention to the so-called dual-hop (RF/FSO) systems where RF transmission is used at a hop followed by FSO transmission to another. In this article, we study the performance of cooperative transmission systems using a mixed RF-FSO DF (decode and forward) relay using error-correcting codes including QC-LDPC codes at the relay level. The FSO link is modeled by the gamma-gamma distribution, and the RF link is modeled by the Additive White Gaussian Noise (AWGN) model. Another innovation in this article is the use of cooperative systems using a mixed FSO/RF DF relay using quasicyclic low-density parity check (QC-LDPC) codes at the relay level. We also use the space-coupled low-density parity check (SC-LDPC) codes on the same scheme to show its importance in cooperative optical transmission but also in hybrid RF/FSO transmission. The latter will be compared with QC-LDPC codes. The use of mixed RF/FSO cooperative transmission systems can improve the reliability and transmission of information in networks. The results demonstrate an improvement in the performance of the cooperative RF/FSO DF system based on QC-LDPC and SC-LDPC codes compared to RF/FSO systems without the use of codes, but also to the DF systems proposed in the existing literature.
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Khan, Rabia, and Dushantha Nalin K. Jayakody. "Full Duplex Component-Forward Cooperative Communication for a Secure Wireless Communication System." Electronics 9, no. 12 (December 10, 2020): 2102. http://dx.doi.org/10.3390/electronics9122102.

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The technological breakthrough in the form of Internet of Things (IoT), Big data and connected world is increasing the demand of better spectrum utilization. Half-Duplex (HD) transmission is mostly used in the earlier communication systems. The high transmission demand requires the better utilization of the existing spectrum. There are several possible ways to overcome the problem of better spectrum usage. In-Band Full Duplex (IBFD) is one of the techniques that can double the Spectral Efficiency (SE) in a Beyond 5G (B5G) communication system. In this paper, our aim is to use the spectral efficient IBFD scheme to improve the security of the system with minimum interference. The interference can be reduced by the addition of orthogonality between the transmitted and received signal of a relay. A component-forward scheme is proposed in this paper to create such orthogonality. For achieving the desired aim, IBFD is used with Device-to-Device (D2D), Artificial Noise (AN), Modulation based orthogonalization, Radio Frequency Energy Harvesting (RFEH) and proposed Full-Duplex Component Forward (FD-CF) algorithm for multiple relays. We also use non-linear harvested power as one of the sources to reuse the exiting power for evaluating the system performance. The derivation of Secrecy Outage Probability (SOP) and throughput is derived in this paper for the FD-CF cooperative communication and is explored with and without non-linear RFEH. The simulation results show the comparison between the component-forward and decode-and-forward communication with one or more relays.
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Bao, Jing-Jing, Qiang Mai, and Jih-Fu Tu. "Study of Cooperative Strategy Based on Space–Time Labeling Diversity in Indoor Visible Light Communication Systems." Symmetry 12, no. 5 (May 2, 2020): 702. http://dx.doi.org/10.3390/sym12050702.

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As an emerging technique of wireless communication, visible light communication is experiencing a boom in the global communications field, and the dream of accessing the Internet with light is fast becoming a reality. Multiple input multiple output, which is a key technique in radio frequency communication, can multiply channel capacity. However, it suffers the trouble of too large channel correlation when directly applied to visible light communication. The aims of this paper were to investigate spatial modulation and cooperative communication, then put forward a cooperative strategy based on space–time labeling diversity for indoor visible light communication systems to achieve high reliability. This scheme was conceived in two steps: (1) a cooperative indoor visible light communication system with a source luminaire, a relay luminaire, and a destination receiver was set up by employing the idea of cooperative transmission. Relative to the destination receiver, these two luminaires can be symmetric or asymmetric in geographical distribution. (2) Space–time labeling diversity of the constellations at the source luminaire was re-adjusted at the relay luminaire to enlarge the product of the distance of corresponding points on both constellations and was introduced on the basis of spatial modulation. Furthermore, total bit error ratio of the proposed cooperative indoor visible light communication system was derived. This scheme was implemented through Monte Carlo simulation. Evaluations of performance demonstrated the superiority of the cooperative strategy based on space–time labeling diversity over conventional optical transmission schemes. The presented approach in this paper could be of some value and interest to those who are working on visible light communication devices.
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Gong, Shimin, Jing Xu, Dusit Niyato, Xiaoxia Huang, and Zhu Han. "Backscatter-Aided Cooperative Relay Communications in Wireless-Powered Hybrid Radio Networks." IEEE Network 33, no. 5 (September 2019): 234–41. http://dx.doi.org/10.1109/mnet.2019.1800335.

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Chen, Qian Matteo, Alberto Finzi, Toni Mancini, Igor Melatti, and Enrico Tronci. "MILP, Pseudo-Boolean, and OMT Solvers for Optimal Fault-Tolerant Placements of Relay Nodes in Mission Critical Wireless Networks*." Fundamenta Informaticae 174, no. 3-4 (September 28, 2020): 229–58. http://dx.doi.org/10.3233/fi-2020-1941.

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In critical infrastructures like airports, much care has to be devoted in protecting radio communication networks from external electromagnetic interference. Protection of such mission-critical radio communication networks is usually tackled by exploiting radiogoniometers: at least three suitably deployed radiogoniometers, and a gateway gathering information from them, permit to monitor and localise sources of electromagnetic emissions that are not supposed to be present in the monitored area. Typically, radiogoniometers are connected to the gateway through relay nodes. As a result, some degree of fault-tolerance for the network of relay nodes is essential in order to offer a reliable monitoring. On the other hand, deployment of relay nodes is typically quite expensive. As a result, we have two conflicting requirements: minimise costs while guaranteeing a given fault-tolerance. In this paper, we address the problem of computing a deployment for relay nodes that minimises the overall cost while at the same time guaranteeing proper working of the network even when some of the relay nodes (up to a given maximum number) become faulty (fault-tolerance). We show that, by means of a computation-intensive pre-processing on a HPC infrastructure, the above optimisation problem can be encoded as a 0/1 Linear Program, becoming suitable to be approached with standard Artificial Intelligence reasoners like MILP, PB-SAT, and SMT/OMT solvers. Our problem formulation enables us to present experimental results comparing the performance of these three solving technologies on a real case study of a relay node network deployment in areas of the Leonardo da Vinci Airport in Rome, Italy.
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Авдєєнко, Гліб Леонідович, Сергій Георгійович Бунін, and Теодор Миколайович Наритник. "ТЕРАГЕРЦОВІ ТЕХНОЛОГІЇ В ТЕЛЕКОМУНІКАЦІЙНИХ СИСТЕМАХ. ЧАСТИНА 2. ДОСЛІДЖЕННЯ ТА МОДЕЛЮВАННЯ ПЕРЕДАВАННЯ ТЕЛЕВІЗІЙНИХ СИГНАЛІВ СТАНДАРТУ DVB-C І ІМПУЛЬСНОГО НАДШИРОКОСМУГОВОГО СИГНАЛУ РАДІОЛІНІЄЮ ТЕРАГЕРЦОВОГО ДІАПАЗОНУ." RADIOELECTRONIC AND COMPUTER SYSTEMS, no. 3 (October 30, 2018): 80–96. http://dx.doi.org/10.32620/reks.2018.3.09.

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The laboratory testbed of a digital simplex radio-relay system of the terahertz range has been studied for the first time in practical terms. It consists of the receiver and transmitter parts of 130÷134 GHz frequency range and a digital modem with a channel data transmission of up to 1200 Mbps for a communication point-to-point distance under normal conditions within 1 km. It is shown that the proposed telecommunication system, which implements the concept of the creation of software-defined radio systems based on Wi-Fi technology, can be highly productive in the next generation mobile communication networks providing the appropriate transmission speeds, reliability, and security. It is studied the parameters of multichannel digital TV signal DVB-C standard when it is transmitted through the testbed of the transmitter and receiver parts of 130 GHz band. The results of the research showed that the application of lower part of terahertz frequency band (130 GHz) with a bandwidth of 24 MHz allows the transmission of three DVB-C television broadcasting channels with a total transport speed of 125 Mbit/s with a high subjective quality of TV programs. The results of the simulation of impulse ultrawideband (IR-UWB) signal transmission by the wireless link of terahertz band are presented. The results of researches of changes of IR-UWB Gaussian monocycle in the transmitter part and its reception by the receiver part of 130.4÷131.5 GHz terahertz band are presented for the first time. On the basis of the results of the research, the requirements for parameters of terahertz wireless link are formulated to ensure acceptable quality of ultrawideband impulse signals receiving. Development of the transmitter and receiver parts of radio relay system of the terahertz range has no direct current analogs in Ukraine. It can provide a significant breakthrough in the development of the telecommunications industry. The obtained research results will also contribute to the development of telecommunications-related industries, in particular: radio astronomy, inter-satellite communication, radar systems, medicine, etc.
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Rauniyar, Ashish, Paal Engelstad, and Olav Østerbø. "RF Energy Harvesting and Information Transmission Based on NOMA for Wireless Powered IoT Relay Systems." Sensors 18, no. 10 (September 27, 2018): 3254. http://dx.doi.org/10.3390/s18103254.

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Amidst the rapid development of the fifth generation (5G) networks, Internet of Things (IoT) is considered as one of the most important part of 5G next generation networks as it can support massive object communications. These massive object communications in the context of IoT is expected to consume a huge power. Furthermore, IoT sensors or devices are rather power constrained and are mostly battery operated. Therefore, energy efficiency of such network of IoT devices is a major concern. On the other hand, energy harvesting (EH) is an emerging paradigm that allows the wireless nodes to recharge themselves through radio frequency (RF) signals directed to them from the source node and then relaying or transmitting the information. Although a myriad of works have been carried out in the literature for EH, the vast majority of those works only consider RF EH at the relay node and successfully transmitting the source node data. Those approaches do not consider the data transmission of the relay node that may be an energy deprived IoT node which needs to transmit its own data along with the source node data to their respective destination nodes. Therefore, in this paper, we envisioned a RF EH and information transmission system based on time switching (TS) relaying, power splitting (PS) relaying and non-orthogonal multiple access (NOMA) which is suitable for wireless powered IoT relay systems. A source node information data is relayed through power constrained IoT relay node I o T R that first harvests the energy from source node RF signal using either TS and PS relaying protocol and then transmits the source node information along with its information using NOMA protocol to the respective destination nodes. Considering NOMA as a transmission protocol, we have mathematically derived analytical expressions for TS and PS relaying protocol for our proposed system. We have also formulated an algorithm to find out optimal TS and PS factor that maximizes the sum-throughput for our proposed system. Our proposed system analytical results for TS and PS protocol are validated by the simulation results.
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Dissertations / Theses on the topic "Wireless communication systems. Radio relay systems"

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Dai, Gao Yang. "A novel soft forwarding technique for cooperative communication /." View abstract or full-text, 2010. http://library.ust.hk/cgi/db/thesis.pl?ECED%202010%20DAI.

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Xing, Chengwen, and 邢成文. "Linear minimum mean-square-error transceiver design for amplify-and-forward multiple antenna relaying systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B44769738.

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Alotaibi, Faisal T. "Distributed space-time block coding in cooperative relay networks with application in cognitive radio." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/10965.

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Spatial diversity is an effective technique to combat the effects of severe fading in wireless environments. Recently, cooperative communications has emerged as an attractive communications paradigm that can introduce a new form of spatial diversity which is known as cooperative diversity, that can enhance system reliability without sacrificing the scarce bandwidth resource or consuming more transmit power. It enables single-antenna terminals in a wireless relay network to share their antennas to form a virtual antenna array on the basis of their distributed locations. As such, the same diversity gains as in multi-input multi-output systems can be achieved without requiring multiple-antenna terminals. In this thesis, a new approach to cooperative communications via distributed extended orthogonal space-time block coding (D-EO-STBC) based on limited partial feedback is proposed for cooperative relay networks with three and four relay nodes and then generalized for an arbitrary number of relay nodes. This scheme can achieve full cooperative diversity and full transmission rate in addition to array gain, and it has certain properties that make it alluring for practical systems such as orthogonality, flexibility, low computational complexity and decoding delay, and high robustness to node failure. Versions of the closed-loop D-EO-STBC scheme based on cooperative orthogonal frequency division multiplexing type transmission are also proposed for both flat and frequency-selective fading channels which can overcome imperfect synchronization in the network. As such, this proposed technique can effectively cope with the effects of fading and timing errors. Moreover, to increase the end-to-end data rate, this scheme is extended for two-way relay networks through a three-time slot framework. On the other hand, to substantially reduce the feedback channel overhead, limited feedback approaches based on parameter quantization are proposed. In particular, an optimal one-bit partial feedback approach is proposed for the generalized D-O-STBC scheme to maximize the array gain. To further enhance the end-to-end bit error rate performance of the cooperative relay system, a relay selection scheme based on D-EO-STBC is then proposed. Finally, to highlight the utility of the proposed D-EO-STBC scheme, an application to cognitive radio is studied.
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Bui, Tuyen Thi Bich Electrical Engineering &amp Telecommunications Faculty of Engineering UNSW. "Superposition coding and modulation technique for wireless relay systems." Awarded by:University of New South Wales, 2007. http://handle.unsw.edu.au/1959.4/36827.

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Cooperative communication has been considered a promising technique used in wireless network to introduce diversity. Based on distributed architecture, cooperative network enables single-antenna users to share their information as a virtual multiple antenna array, which makes it possible to enhance the user data rates and obtain the diversity gain. Depending on the ways users share and process the information, practical user cooperation is mainly grouped in three modes: Amplify and Forward (AF), Decode and Forward (DF) and Compress and Forward (CF). Generally, DF outperforms AF in most practical implementation and is alternately the best by theoretical analysis. In particular, it is shown in theory that DF outperforms CF when the inter-user link is in good condition and vice versa. Considered as a capacity achieving approach, superposition encoding technique produces approximate Gaussian output signals. It is the power and spectral efficiency of the encoding scheme that make it useful for several wireless communication systems such as MIMO system, relay channels, and so on. The main goal of the thesis is to study how much superposition coding can help when applied to DF user cooperation. In particular, a new DF scheme with soft information relaying technique is proposed to overcome the performance degradation happening when the quality of the inter-user channel is bad. Based on the scheme, soft log-likelihood ratio (LLR) of the relay decoder is quantized, encoded, modulated by superimposition and then forwarded to the destination. The destination receiver employs an iterative superposition decoder and modified maximum a posteriori probability (MAP) decoder to recover the transmitted signal from the source. The performance of the scheme is evaluated by simulation. We show that the new scheme can significantly outperform the conventional DF scheme even in a poor inter-user channel. Furthermore, a new cooperative transmission strategy based on superposition and multiuser detection techniques is also investigated in the thesis. The new scheme is an improved DF scheme in which the two users take turns in being the relay for each other and the signal forwarded by each user is the superimposed data of both users. Here, interleavers are introduced in the superposition process as an efficient user separation tool, providing a large improvement in error performance and also facilitating the decoding process at the destination. Different types of iterative receivers are examined. The performance of the scheme is evaluated by simulation. It is shown that the new transmission scheme outperforms the conventional one in terms of both spectral and power efficiency.
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Negi, Ansuya. "Analysis of Relay-based Cellular Systems." PDXScholar, 2006. https://pdxscholar.library.pdx.edu/open_access_etds/2668.

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Relays can be used in cellular systems to increase coverage as well as reduce the total power consumed by mobiles in a cell. This latter benefit is particularly useful for mobiles operating on a depleted battery. The relay can be a mobile, a car or any other device with the appropriate communication capabilities. In thesis we analyze the impact of using relays under different situations. We first consider the problem of reducing total power consumed in the system by employing relays intelligently. We find that in a simulated, fully random, mobile cellular network for CDMA (Code Division Multiple Access), significant energy savings are possible ranging from 1.76 dB to 8.45 dB. In addition to reducing power needs, relays can increase the coverage area of a cell by enabling mobiles located in dead spots to place relayed calls. We note that use of relays can increase the useful service area by about 10% with real life scenarios. We observe that in heavy building density areas there is more need of relays as compared to low building density areas. However, the chance of finding relays is greater in low building density areas. Indeed, having more available idle nodes helps in choosing relays, so we conclude that unlike present day implementations of cellular networks, the base station should admit more mobiles (beyond the capacity of the cell) even if they are not placing calls since they can be used as relays. One constraint of using relays is the potential to add interference in the same cell and in neighboring cells. This is particularly true if the relays are not under power control. Based on our analysis, we conclude that in interference limited systems like CDMA the relays have to be under power control otherwise we will reduce the total capacity by creating more dead spots. Thus, we believe that either the base station should be responsible to allocate relays or relays should be provided with enough intelligence to do power control of the downlink. Finally, we show how utility of data services can be increased by use of relays.
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Zhang, Jin. "Relay and routing selection in relay-based wireless networks /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?CSED%202009%20ZHANG.

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Caffery, James Joseph Jr. "Wireless location in CDMA cellular radio systems." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/15504.

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Alves, Hirley. "On the performance analysis of full-duplex networks." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1253.

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Nesta tese estudamos redes cooperativas em modo de operação Full-Duplex (FD). Para tanto, usamos conceitos de teoria da informação e da comunicação, além de estatística aplicada. Assim, fornecemos uma extensa análise de desempenho de sistemas cooperativos em modo FD. Além disso, demonstramos que a operação de relays em modo FD é possível, mesmo sofrendo intensos níveis de auto-interferência. Mostramos também sua aplicação em diversos cenários. Ademais, os resultados obtidos através deste trabalho servem como referência para o design e desenvolvimento de futuras tecnologias de comunicação sem-fio. Primeiramente, contribuímos com uma extensa revisão do estado da arte em comunicações em modo FD, especificamente relays FD, e além disto revisitamos as principais propriedades de esquemas de comunicação cooperativa. Analisamos de maneira extensiva o desempenho de esquemas com relays FD em ambientes com desvanecimento do tipo Rayleigh em termos probabilidade de falha de comunicação, vazão e eficiência energética. Além de todo arcabouço matemático introduzido nesta tese, também identificamos os casos em que sistemas cooperativos em mode Half-Duplex (HD) podem ser vantajosos comparados aos esquemas FD com auto-interferência. Assim, discutimos as relações de custo-benefício entre esquemas HD e FD e entre vazão e eficiência energética. A seguir, elaboramos o modelo estudado e estendemos os resultados iniciais para incorporar os casos com modelos mais gerais de desvanecimento, conhecidos como Nakagami-m. Estes resultados auxiliam na compreensão dos efeitos da auto-interferência residual e linha de visada em sistemas com relays FD. Por fim, contribuímos também com uma análise de desempenho de sistemas cooperativos seguros. Para tanto, usamos ferramentas da teoria da informação para aumentar a privacidade e confidencialidade da comunicação em canais sem-fio. Sendo assim, fornecemos um extenso arcabouço matemático para canais com desvanecimento composto. Além disto, demonstramos que, mesmo sofrendo forte auto-interferência, comunicação segura com relays FD pode também ser obtida, uma vez que segurança perfeita pode ser obtida.
In this thesis we study Full-Duplex (FD) cooperative networks from different perspectives, using concepts of information theory, communication theory and applied statistics. We provide a comprehensive performance analysis of cooperative communications systems operating with FD relays. We demonstrate that FD relaying is feasible even when experiencing strong self-interference, and we show its application under different scenarios. More importantly, the results attained through this work serve as a benchmark for design as well as deployment of current and future wireless communications technologies. Our first contribution is a comprehensive overview of the state-of-the-art on FD communications, more specifically on FD relaying, and we revisit some of the main properties of cooperative schemes. Another contribution comes from an extensive analysis of outage probability, throughput and energy efficiency of FD relaying over Rayleigh fading channels. Besides the mathematical framework introduced herein, we also show that in some cases cooperative Half-Duplex (HD) schemes achieve better performance than FD relaying with self-interference. Therefore, we draw a discussion on the trade-offs between HD and FD schemes as well as between throughput and energy efficiency. Then, we investigate the performance of FD relaying protocols under general fading settings, namely Nakagami-m fading. Our findings allow a better understanding of effects of the residual self-interference and line-of-sight on a FD relaying setup. Our final contribution lies on the performance analysis of secure cooperative networks relying on information theoretical metrics to provide enhanced privacy and confidentiality to wireless networks. Thus, we provide a comprehensive mathematical framework for composite fading channels. Even though experiencing strong self-interference, we demonstrate that FD relaying is feasible also under secrecy constraints, thus perfect secrecy can be achieved.
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Zhang, Shunqing. "Cooperative relay in the next generation wireless networks /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?ECED%202009%20ZHANGS.

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Liu, Yi. "The performance of future wireless communication systems." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:a2f0b75e-3b0d-406e-af1b-6c5038c18fae.

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Multimedia services provided through wireless networks, such as mobile television and video calls, have recently attracted great attention. These systems require higher data rates, better communication quality, and wider channel bandwidth compared with traditional wireless network services, such as voice calling and text messaging. In response to these demands, multiple-input multiple-output (MIMO) employing multiple antennas at both transmitter and receiver, has been investigated in recent years. Nevertheless, the major impediment in MIMO based wireless systems is the cost of the hardware due to the requirement of the complete radio frequency (RF) chain for each transmit and receive path. One technique named antenna subset selection has been proposed which can reduce the hardware complexity, for example, provide and smaller number of RF chains which are reconfigurable to serve multiple antennas, but retain good communication performance, such as increasing data rates and improving communication quality. On the other hand, network service providers have in recent years established wideband communication systems in order to provide more services and higher bandwidth to customers. However, this development lowers the communication link quality, since signals transmitted in wideband communication systems suffer frequency-selective fading. In order to reduce the fading, orthogonal frequency division multiplexing (OFDM) as a potential infrastructure in the fourth generation mobile communication networks is developed. Referring to the cost-performance ratio, an attractive future wireless system named antenna selection based MIMO-OFDM is considered to be widely utilized in civil wireless communications in near future. The working theory of antenna selection based MIMO-OFDM systems can be simply represented as that a data stream at each selected transmit/receiver antenna is sent/receive over a number of narrow band orthogonal subcarriers. This thesis addresses analysis of wireless channel and performance investigation of future wireless communication systems, such as MIMO and OFDM structures. Moreover, a novel significantly low computational complexity algorithm is introduced in this thesis, which is proposed for antenna selection MIMO-OFDM systems on the basis of multiple selection criteria. It is shown that the proposed selection algorithm clearly reduces the computational complexity load of the selection process and efficiently selects the optimum antenna subset of antenna selection MIMO-OFDM systems. The thesis concludes by outlining the advantage of the proposed antenna selection technique and points out its potential role in future wireless communications.
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Books on the topic "Wireless communication systems. Radio relay systems"

1

Hong, Peter Y. W. Cooperative Communications and Networking: Technologies and System Design. Boston, MA: Springer Science+Business Media, LLC, 2010.

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1964-, Ruggiero Michael, ed. Femtocells: Design & application. New York: McGraw-Hill, 2011.

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Bertoni, Henry L. Radio propagation for modern wireless systems. Upper Saddle River, NJ: Prentice Hall PTR, 2000.

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Roda, Giovanni. Troposcatter radio links. Boston: Artech House, 1988.

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Chang, Kai. RF and Microwave Wireless Systems. New York: John Wiley & Sons, Ltd., 2005.

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Advanced RF engineering for wireless systems and networks. Hoboken, NJ: John Wiley, 2005.

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Wireless location in CDMA cellular radio systems. Boston: Kluwer Academic, 2000.

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1957-, Rose Christopher, ed. Interference avoidance methods for wireless systems. New York: Kluwer Academic/Plenum, 2004.

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Brown, Tim. Practical guide to the MIMO radio channel with MATLAB examples. Chichester, West Sussex, U.K: Wiley, 2012.

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service), SpringerLink (Online, ed. Wireless Transceiver Systems Design. Boston, MA: Springer Science+Business Media, LLC, 2008.

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Book chapters on the topic "Wireless communication systems. Radio relay systems"

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Silva, Yuri C. B., Tarcisio F. Maciel, and Francisco R. P. Cavalcanti. "Radio Resource Management Performance for the GSM/EDGE Radio Acess Network." In Optimizing Wireless Communication Systems, 51–94. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-0155-2_2.

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da Silva, Alex P., Leonardo S. Cardoso, Vicente A. de Souza, and Francisco R. P. Cavalcanti. "Common Radio Resource Management for Multiaccess Wireless Networks." In Optimizing Wireless Communication Systems, 233–65. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-0155-2_6.

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Rappaport, Theodore S., and Sandip Sandhu. "Radio Wave Propagation for Emerging Wireless Personal Communication Systems." In Wireless Personal Communications, 1–27. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4757-2368-7_1.

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Bonnet, Christian, Giuseppe Caire, Alain Enout, Pierre A. Humblet, Giuseppe Montalbano, Alessandro Nordio, and Domnique Nussbaum. "A Software Radio Platform for New Generations of Wireless Communication Systems." In Software Radio, 105–16. London: Springer London, 2001. http://dx.doi.org/10.1007/978-1-4471-0343-1_9.

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Kim, Seon Jin, Gino J. Lim, and Jaeyoung Cho. "Drone Relay Stations for Supporting Wireless Communication in Military Operations." In Advances in Intelligent Systems and Computing, 123–30. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60384-1_12.

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Ruffieux, David, Jérémie Chabloz, Matteo Contaldo, and Christian C. Enz. "A 2.4-GHz Narrowband MEMS-Based Radio." In MEMS-based Circuits and Systems for Wireless Communication, 259–87. Boston, MA: Springer US, 2012. http://dx.doi.org/10.1007/978-1-4419-8798-3_10.

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Mohaisen, Rami, and Mamoun F. Al-Mistarihi. "Performance Evaluation of Bit Error Rate in Relay-Based Cooperative Diversity Systems over Rayleigh Fading Channels with Interference." In Wired/Wireless Internet Communication, 241–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-38401-1_19.

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López-Benítez, Miguel. "Overview of Recent Applications of Cognitive Radio in Wireless Communication Systems." In Handbook of Cognitive Radio, 1–32. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-1389-8_59-1.

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López-Benítez, Miguel. "Overview of Recent Applications of Cognitive Radio in Wireless Communication Systems." In Handbook of Cognitive Radio, 1887–918. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-10-1394-2_59.

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Patil, Vinayak Laxman. "Electromagnetic Waves in Communication." In Chronological Developments of Wireless Radio Systems before World War II, 19–31. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4905-6_3.

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Conference papers on the topic "Wireless communication systems. Radio relay systems"

1

Louni, Alireza, and Babak Hossein Khalaj. "Joint power control and pricing for underlay relay-based cognitive radio networks." In 2011 8th International Symposium on Wireless Communication Systems (ISWCS 2011). IEEE, 2011. http://dx.doi.org/10.1109/iswcs.2011.6125361.

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Shaat, Musbah, and Faouzi Bader. "Comparison of OFDM and FBMC performance in multi-relay cognitive radio network." In 2012 9th International Symposium on Wireless Communication Systems (ISWCS 2012). IEEE, 2012. http://dx.doi.org/10.1109/iswcs.2012.6328469.

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Mu, Hua, and Jitendra K. Tugnait. "MSE-based source and relay precoder design for cognitive radio multiuser two-way relay systems." In 2012 IEEE Wireless Communications and Networking Conference (WCNC). IEEE, 2012. http://dx.doi.org/10.1109/wcnc.2012.6214469.

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Yan, Zhi, Xing Zhang, and Wenbo Wang. "Outage performance of relay assisted hybrid overlay/underlay cognitive radio systems." In 2011 IEEE Wireless Communications and Networking Conference (WCNC). IEEE, 2011. http://dx.doi.org/10.1109/wcnc.2011.5779452.

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Pandharipande, Ashish, and Chin Keong Ho. "Spectrum pool reassignment for wireless multi-hop relay systems." In 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008). IEEE, 2008. http://dx.doi.org/10.1109/crowncom.2008.4562547.

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Sanguanpuak, Tachporn, Nandana Rajatheva, Attaphongse Taparugssanagorn, and Hirley Alves. "Performance of energy detector over Nakagami-m fading for relay-based cognitive radio networks." In 2012 9th International Symposium on Wireless Communication Systems (ISWCS 2012). IEEE, 2012. http://dx.doi.org/10.1109/iswcs.2012.6328427.

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Abualhaol, Ibrahim Y. "Symbol error rate analysis of relay-based wireless systems." In 2011 IEEE 22nd International Symposium on Personal, Indoor and Mobile Radio Communications - (PIMRC 2011). IEEE, 2011. http://dx.doi.org/10.1109/pimrc.2011.6139839.

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Gautam, Sumit, Eva Lagunas, Shree K. Sharma, Symeon Chatzinotas, and Bjorn Ottersten. "Relay selection strategies for SWIPT-enabled cooperative wireless systems." In 2017 IEEE 28th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC). IEEE, 2017. http://dx.doi.org/10.1109/pimrc.2017.8292374.

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Yu, Yang, Chaowei Wang, Weidong Wang, and Yinghai Zhang. "Relay selection and power allocation with minimum rate guarantees for cognitive radio systems." In 2014 IEEE Wireless Communications and Networking Conference (WCNC). IEEE, 2014. http://dx.doi.org/10.1109/wcnc.2014.6953029.

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Yan, Shengnan, and Xiaoxiang Wang. "Power Allocation for Cognitive Radio Systems Based on Nonregenerative OFDM Relay Transmission." In 2009 5th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM). IEEE, 2009. http://dx.doi.org/10.1109/wicom.2009.5302883.

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