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Title: Channel characterization for acoustic communications in shallow water using QPSK data.
Creator: Caimi, F. M., Murshid, S. H., Tongta, R., Carroll, M.
Date Issued: 1998
PURL: http://purl.flvc.org/FCLA/DT/3338526
Subject Headings: Underwater acoustic telemetry, System identification, Digital communications
Format: Document (PDF)

Title: Digital acoustic communications using decision directed learning.
Creator: Alleyne, Jochen Raoul, Florida Atlantic University, LeBlanc, Lester R., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: This document serves as a dissertation for the Doctor of Philosophy in Ocean Engineering degree at Florida Atlantic University's Department of Ocean Engineering. This dissertation documents the design, development, and performance analysis of an acoustic receiver system that incorporates a decision directed learning filter for acoustic multi-phase shift keying signals. The system makes use of advanced signal processing, inclusive of spatial diversity and decision directed learning techniques...
Show moreThis document serves as a dissertation for the Doctor of Philosophy in Ocean Engineering degree at Florida Atlantic University's Department of Ocean Engineering. This dissertation documents the design, development, and performance analysis of an acoustic receiver system that incorporates a decision directed learning filter for acoustic multi-phase shift keying signals. The system makes use of advanced signal processing, inclusive of spatial diversity and decision directed learning techniques in order to decode digital acoustic data. Error correcting techniques are also employed as well as methods of analyzing the efficiency of the system.
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Date Issued: 2001
PURL: http://purl.flvc.org/fcla/dt/11951
Subject Headings: Underwater acoustic telemetry, Digital communications, Acoustic filters
Format: Document (PDF)

Title: High-rate wireless data communications: an underwater acoustic communications framework at the physical layer.
Creator: Bessios, Anthony G., Caimi, F. M., Harbor Branch Oceanographic Institute
Date Issued: 1996
PURL: http://purl.flvc.org/FCLA/DT/3351962
Subject Headings: Wireless communication systems, Underwater acoustic telemetry, Underwater acoustics, Digital communications
Format: Document (PDF)

Title: Fast underwater acoustic data link design via multicarrier modulation and higher-order statistics equalization.
Creator: Bessios, Anthony G., Caimi, F. M., Harbor Branch Oceanographic Institute
Date Issued: 1995
PURL: http://purl.flvc.org/FCLA/DT/3172993
Subject Headings: Wireless communication systems, Digital communications, Remote submersibles, Robotics, Stochastic analysis
Format: Document (PDF)

Title: Control system for a QPSK burst modem used for ACTS satellite testing.
Creator: Knight, Terence Robert., Florida Atlantic University, Helmken, Henry, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: A test system was designed to determine the performance a QPSK satellite burst modem when using the Ka band link of the Advanced Communications Technology Satellite. Interface circuitry, largely based on the 22V10 programmable logic device, was designed to allow the modem to be controlled by a personal computer. Communication between the interface and the computer was accomplished through the computer's parallel port. TDMA frame timing was automatically controlled by the interface. A C...
Show moreA test system was designed to determine the performance a QPSK satellite burst modem when using the Ka band link of the Advanced Communications Technology Satellite. Interface circuitry, largely based on the 22V10 programmable logic device, was designed to allow the modem to be controlled by a personal computer. Communication between the interface and the computer was accomplished through the computer's parallel port. TDMA frame timing was automatically controlled by the interface. A C language program provided operator control of the interface itself. Tests using this system showed that a severe night-time fading problem is experienced at the FAU receiver site. Very low error rates were recorded by this system in a loop-back transmission at the NASA satellite control terminal.
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Date Issued: 1995
PURL: http://purl.flvc.org/fcla/dt/15139
Subject Headings: Advanced Communications Technology Satellite, Artificial satellites in telecommunication, Digital communications
Format: Document (PDF)

Title: Innovative video error resilient techniques for MBMS systems.
Creator: Sanigepalli, Praveen., Florida Atlantic University, Kalva, Hari, Furht, Borko, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: In the current communications age, the capabilities of mobile devices are increasing. The mobiles are capable of communicating at data rates of hundreds of mbps on 4G networks. This enables playback of rich multimedia content comparable to internet and television networks. However, mobile networks need to be spectrum-efficient to be affordable to users. Multimedia Broadcast Multicast Systems (MBMS) is a wireless broadcasting standard that is being drafted to enable multimedia broadcast while...
Show moreIn the current communications age, the capabilities of mobile devices are increasing. The mobiles are capable of communicating at data rates of hundreds of mbps on 4G networks. This enables playback of rich multimedia content comparable to internet and television networks. However, mobile networks need to be spectrum-efficient to be affordable to users. Multimedia Broadcast Multicast Systems (MBMS) is a wireless broadcasting standard that is being drafted to enable multimedia broadcast while focusing on being spectrum-efficient. The hybrid video coding techniques facilitate low bitrate transmission, but result in dependencies across frames. With a mobile environment being error prone, no error correction technique can guarantee error free transmission. Such errors propagate, resulting in quality degradation. With numerous mobiles sharing the broadcast session, any error resilient scheme should account for heterogeneous device capabilities and channel conditions. The current research on wireless video broadcasting focuses on network based techniques such as FEC and retransmissions, which add bandwidth overhead. There is a need to design innovative error resilient techniques that make video codec robust with minimal bandwidth overhead. This Dissertation introduces novel techniques in the area of MBMS systems. First, robust video structures are proposed in Periodic Intra Frame based Prediction (PIFBP) and Periodic Anchor Frame based Prediction (PAFBP) schemes. In these schemes, the Intra frames or anchor frames serve as reference frames for prediction during GOP period. The intermediate frames are independent of others; any errors in such frames are not propagated, thereby resulting in error resilience. In prior art, intra block rate is adapted based on the channel characteristics for error resilience. This scheme has been generalized in multicasting to address a group of users sharing the same session. Average packet loss is used to determine the intra block rate. This improves performance of the overall group and strives for consistent performance. Also, the inherent diversity in the broadcasting session can be used for its advantage. With mobile devices capable of accessing a WLAN during broadcast, they form an adhoc network on a WLAN to recover lost packets. New error recovery schemes are proposed for error recovery and their performance comparison is presented.
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Date Issued: 2005
PURL: http://purl.flvc.org/fcla/dt/12187
Subject Headings: Wireless communication systems, Signal processing, Digital video, Multimedia systems, Digital communications, Data transmission systems
Format: Document (PDF)

Title: A improved video codec supporting error resilience and resource adaptation.
Creator: Furht, Borko, Sanigepalli, Praveen, Kalva, Hari
Date Issued: 2005-01-8 - 2005-01-12
PURL: http://purl.flvc.org/fcla/dt/351015
Subject Headings: MPEG (Video coding standard), Digital video., Mobile communication systems.
Format: Document (PDF)

Title: Cross-domain authentication for multi-protocol phones.
Creator: Thakker, Chetan., Florida Atlantic University, Pandya, Abhijit S., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: The last decade has seen a surge in demand for cellular and WLAN networks. With the introduction of Voice Over IP, cellular companies are looking at WLAN-Cellular integrated networks that shall provide users with economical voice and data services. These networks shall be complimentary to the existing cellular networks. A lot of money is spent in registering and authenticating new users, since they are separately authenticated and registered on the WLAN and Cellular domains. This leads to...
Show moreThe last decade has seen a surge in demand for cellular and WLAN networks. With the introduction of Voice Over IP, cellular companies are looking at WLAN-Cellular integrated networks that shall provide users with economical voice and data services. These networks shall be complimentary to the existing cellular networks. A lot of money is spent in registering and authenticating new users, since they are separately authenticated and registered on the WLAN and Cellular domains. This leads to extra costs for the company. Thus for the integrated networks to have an impact on the market some issues such as simpler authentication and registration must be resolved. Therefore we propose a new inter-working model that shall addresses the authentication and registration problem for an integrated network for voice and data. The Single authentication system of the new inter-working model, shall authenticate the user in an integrated network using the SIM credentials, this authentication shall be valid for both voice and data. Also registration costs will be saved by preventing separate registration of users in the WLAN and Cellular domain.
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Date Issued: 2005
PURL: http://purl.flvc.org/fcla/dt/13260
Subject Headings: Integrated services digital networks, Digital telephone systems, Wireless communication systems--Technological innovations, Mobile communication systems--Technological innovations
Format: Document (PDF)

Title: Complexity reduction tools for MPEG-2 to H.264 video transcoding.
Creator: Furht, Borko, Kalva, Hari, Petljanski, Branko
PURL: http://purl.flvc.org/fcla/dt/332412
Subject Headings: Digital video., Video recording --Standards., MPEG (Video coding standard)., Digital communications.
Format: Document (PDF)

Title: Characterization and performance evaluation of video conference traffic in ATM networks.
Creator: Nayak, Chandrika Narayana., Florida Atlantic University, Ilyas, Mohammad, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: In order to effectively transport digital compressed video over Broadband Integrated Services Digital Networks (B-ISDN) with Asynchronous Transfer Mode (ATM), the characteristics of the video source traffic should be understood. The nature of the video traffic depends primarily on the source, the content of the video and the coding algorithm that removes redundancies for efficient transmission over networks. In this study, video conference data encoded using a subband coding scheme, Digital...
Show moreIn order to effectively transport digital compressed video over Broadband Integrated Services Digital Networks (B-ISDN) with Asynchronous Transfer Mode (ATM), the characteristics of the video source traffic should be understood. The nature of the video traffic depends primarily on the source, the content of the video and the coding algorithm that removes redundancies for efficient transmission over networks. In this study, video conference data encoded using a subband coding scheme, Digital Video Compression System (DVCS), is analyzed to determine its characteristics. Several video traffic sources are multiplexed through an ATM network node with limited capacity and the performance of this environment is evaluated by using a simulation technique. The simulation results are presented for the performance measures for varying traffic and network conditions.
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Date Issued: 1995
PURL: http://purl.flvc.org/fcla/dt/15166
Subject Headings: Broadband communications systems, Integrated services digital networks, Asynchronous transfer mode, Digital video, Video compression
Format: Document (PDF)

Title: DSP implementation of turbo decoder using the Modified-Log-MAP algorithm.
Creator: Khan, Zeeshan Haneef., Florida Atlantic University, Zhuang, Hanqi, Sudhakar, Raghavan, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: The design of any communication receiver needs to addresses the issues of operating under the lowest possible signal-to-noise ratio. Among various algorithms that facilitate this objective are those used for iterative decoding of two-dimensional systematic convolutional codes in applications such as spread spectrum communications and Code Division Multiple Access (CDMA) detection. A main theme of any decoding schemes is to approach the Shannon limit in signal-to-noise ratio. All these...
Show moreThe design of any communication receiver needs to addresses the issues of operating under the lowest possible signal-to-noise ratio. Among various algorithms that facilitate this objective are those used for iterative decoding of two-dimensional systematic convolutional codes in applications such as spread spectrum communications and Code Division Multiple Access (CDMA) detection. A main theme of any decoding schemes is to approach the Shannon limit in signal-to-noise ratio. All these decoding algorithms have various complexity levels and processing delay issues. Hence, the optimality depends on how they are used in the system. The technique used in various decoding algorithms is termed as iterative decoding. Iterative decoding was first developed as a practical means for decoding turbo codes. With the Log-Likelihood algebra, it is shown that a decoder can be developed that accepts soft inputs as a priori information and delivers soft outputs consisting of channel information, a posteriori information and extrinsic information to subsequent stages of iteration. Different algorithms such as Soft Output Viterbi Algorithm (SOVA), Maximum A Posteriori (MAP), and Log-MAP are compared and their complexities are analyzed in this thesis. A turbo decoder is implemented on the Digital Signal Processing (DSP) chip, TMS320C30 by Texas Instruments using a Modified-Log-MAP algorithm. For the Modified-Log-MAP-Algorithm, the optimal choice of the lookup table (LUT) is analyzed by experimenting with different LUT approximations. A low complexity decoder is proposed for a (7,5) code and implemented in the DSP chip. Performance of the decoder is verified under the Additive Wide Gaussian Noise (AWGN) environment. Hardware issues such as memory requirements and processing time are addressed for the chosen decoding scheme. Test results of the bit error rate (BER) performance are presented for a fixed number of frames and iterations.
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Date Issued: 2002
PURL: http://purl.flvc.org/fcla/dt/12948
Subject Headings: Error-correcting codes (Information theory), Signal processing--Digital techniques, Coding theory, Digital communications
Format: Document (PDF)

Title: Matched filter bound for frequency-selective Nakagami fading channel.
Creator: Jiao, Jiemei., Florida Atlantic University, Aalo, Valentine A.
Abstract/Description: Based on the theoretical method developed by Clark and Greenstein for frequency-selective Rayleigh fading channel, we develop a general model for frequency-selective Nakagami fading channel. We derive analytical expressions of the average bit-error-rate in an ideal space diversity mobile radio receiver using the matched filter bound. Our simulation results show that the influences of the diversity order, the shape of the multipath delay profile, and delay spread of the multipath delay profile...
Show moreBased on the theoretical method developed by Clark and Greenstein for frequency-selective Rayleigh fading channel, we develop a general model for frequency-selective Nakagami fading channel. We derive analytical expressions of the average bit-error-rate in an ideal space diversity mobile radio receiver using the matched filter bound. Our simulation results show that the influences of the diversity order, the shape of the multipath delay profile, and delay spread of the multipath delay profile. Five shapes are considered in our simulation. Our simulation results highlight the importance of the ratio the normalized delay spread d. The results show that the delay profile is of no importance for $d<0.3,$ but can have a profound influence for $d\geq0.3.$
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Date Issued: 1995
PURL: http://purl.flvc.org/fcla/dt/15223
Subject Headings: Digital communications, Signal processing--Digital techniques, Radio--Transmitters and transmission--Fading
Format: Document (PDF)

Title: Quality of service support in TDMA-based mobile ad hoc networks.
Creator: Jawhar, Imad., Florida Atlantic University, Wu, Jie, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: With the continuing advances in computing and wireless technologies, mobile ad hoc networks (MANETs) are expected to become an indispensable part of the computing environment in the near future. Wireless devices are constantly growing in computing speed, memory, communication capabilities and features, while shrinking in weight and size. With this growth and the proliferation of these devices in every aspect of society, the need for such devices to communicate in a seamless manner is becoming...
Show moreWith the continuing advances in computing and wireless technologies, mobile ad hoc networks (MANETs) are expected to become an indispensable part of the computing environment in the near future. Wireless devices are constantly growing in computing speed, memory, communication capabilities and features, while shrinking in weight and size. With this growth and the proliferation of these devices in every aspect of society, the need for such devices to communicate in a seamless manner is becoming increasingly essential. Multiple routing protocols have been developed for MANETs [51]. As MANETs gain popularity, their need to support real time and multimedia applications is growing as well. Such applications have stringent quality of service (QoS) requirements such as bandwidth, delay, and delay fitter. Design and development of routing algorithms with QoS support is experiencing increased research interest. Several approaches which propose various routing algorithms with QoS support for MANETs have been presented in research. This dissertation addresses the issues and challenges of QoS routing in MANETS and presents three new protocols which provide QoS support for this environment. First, a brief classification of existing QoS routing algorithms is provided. Then, the three new protocols for QoS routing support in MANETs are presented. These protocols focus on resource reservation for QoS provisioning in TDMA-based MANETs. The first protocol improves QoS support by eliminating racing conditions during multiple reservations of QoS paths. The second protocol is a new protocol for resource reservation for QoS support in TDMA-based MANETs using directional antennas. The last protocol provides dynamic range resource reservation for QoS support in MANETs and represents an extension of the previous protocols.
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Date Issued: 2005
PURL: http://purl.flvc.org/fcla/dt/12158
Subject Headings: Digital communications, Time division multiple access, Computer algorithms, Computer network protocols, Wireless communication systems
Format: Document (PDF)

Title: Acoustic impulse response mapping for acoustic communications in shallow water.
Creator: Caimi, F. M., Tongta, R., Harbor Branch Oceanographic Institute
Date Issued: 1998
PURL: http://purl.flvc.org/FCLA/DT/3183706
Subject Headings: Electro-acoustics, Sound --Measurement, Acoustical engineering, Digital communications, Signal processing, Signals and signaling, Underwater acoustics, Signal processing --Digital techniques
Format: Document (PDF)

Title: Physical Layer Security of Wireless Transmissions Over Fading Channels.
Creator: Blanc, Sadrac, Aalo, Valentine A., Florida Atlantic University, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: The open nature of the wireless medium makes the wireless communication susceptible to eavesdropping attacks. In addition, fading and shadowing significantly degrade the performance of the communication system in the wireless networks. A versatile approach to circumvent the issues of eavesdropping attacks while exploiting the physical properties of the wireless channel is the so-called physical layer-security. In this work, we consider a model in which two legitimate users communicate in the...
Show moreThe open nature of the wireless medium makes the wireless communication susceptible to eavesdropping attacks. In addition, fading and shadowing significantly degrade the performance of the communication system in the wireless networks. A versatile approach to circumvent the issues of eavesdropping attacks while exploiting the physical properties of the wireless channel is the so-called physical layer-security. In this work, we consider a model in which two legitimate users communicate in the presence of an eavesdropper. We investigate the performance of the wireless network at the physical layer that is subject to a variety of fading environments that may be modeled by the Rayleigh, Nakagami-m, and Generalized-K distributions, to mention a few. We use the secrecy outage probability (SOP) as the standard performance metrics to study the performance of the wireless networks. We propose two different approaches to compute the secrecy outage probability, and derive explicit expressions for the secrecy outage probability that allow us to characterize the performance of the wireless networks. Specifically, we use a direct integration approach as well as a Taylor series base approach to evaluate the secrecy outage probability. Finally, we use computer simulations, based on MATLAB, to confirm the analytical results.
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Date Issued: 2016
PURL: http://purl.flvc.org/fau/fd/FA00004729, http://purl.flvc.org/fau/fd/FA00004729
Subject Headings: Data encryption (Computer science), Digital communications -- Reliability -- Mathematics, Internetworking (Telecommunication), Radio wave propagation, Wireless communication systems -- Security measures
Format: Document (PDF)

Title: Energy-efficient routing in ad hoc wireless networks.
Creator: Dai, Qing., Florida Atlantic University, Wu, Jie
Abstract/Description: The ad hoc wireless network is an infrastructureless network, where mobile stations are typically powered by batteries. Energy conservation has therefore becomes a very important issue. In this thesis, we discuss our work on several problems in energy-efficient routing. Chapter 3 focuses on how to compute the minimum uniform broadcast transmission power in an ad hoc wireless network. Several algorithms are proposed and their running time compared through simulation. It is shown that Prim's...
Show moreThe ad hoc wireless network is an infrastructureless network, where mobile stations are typically powered by batteries. Energy conservation has therefore becomes a very important issue. In this thesis, we discuss our work on several problems in energy-efficient routing. Chapter 3 focuses on how to compute the minimum uniform broadcast transmission power in an ad hoc wireless network. Several algorithms are proposed and their running time compared through simulation. It is shown that Prim's Minimum Spanning Tree (MST) has better performance than Kruskal's MST and the two binary search algorithms. In the following two chapters, routing algorithms are studied for specific situations, when directional antenna is used (Chapter 4) or when partial signal could be collected, stored and integrated (Chapter 5). Different algorithms are discussed and their energy performance illustrated by simulation study. Their application and limitation are also discussed in the thesis.
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Date Issued: 2003
PURL: http://purl.flvc.org/fcla/dt/13077
Subject Headings: Wireless communication systems, Routers (Computer networks), Electronic digital computers--Power supply, Mobile computing
Format: Document (PDF)

Title: Performance studies on digital cellular radio systems operating in a non-Gaussian multipath fading environment.
Creator: Chayawan, Chirasil., Florida Atlantic University, Aalo, Valentine A., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: This dissertation is concerned with studies on the performance aspects of digital cellular radio systems operating in non-Gaussian multipath fading environments. The multipath fading channel, modeled as a superposition of sinusoidal random vectors, is the main focus of this work. Elementary phase distributions, which cause quadrature components of the composite received vector to be correlated, are studied and relevant envelope distribution for the resulting non-Gaussian quadrature components...
Show moreThis dissertation is concerned with studies on the performance aspects of digital cellular radio systems operating in non-Gaussian multipath fading environments. The multipath fading channel, modeled as a superposition of sinusoidal random vectors, is the main focus of this work. Elementary phase distributions, which cause quadrature components of the composite received vector to be correlated, are studied and relevant envelope distribution for the resulting non-Gaussian quadrature components is investigated. The Student-t distributed random process is chosen to model the quadrature components in an indoor multipath fading channel when the number of sinusoidal random vectors is small. For the correlated bivariate non-Gaussian quadrature components, the exact probability distribution function, corresponding to those elementary phase distributions as well as the Gaussian approximation for resultant envelope are evaluated. The scenario where the elementary envelope is beta distributed is also considered. Spherically invariant random process (SIRP) is also used to model the multipath fading channel. The performance analysis based on the spherically invariant multipath fading channel, is then evaluated. The system performance, specified in terms of outage probability and average error probability, significantly depends on the choice of characteristic probability distribution function of the random process that describes the RF ambient. It is shown that the optimality of the optimum combining and maximal ratio combining schemes in interference-limited environments is still retained under the spherically invariant multipath fading channel model.
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Date Issued: 2002
PURL: http://purl.flvc.org/fau/fd/FADT12011
Subject Headings: Cellular telephone systems, Digital communications, Radio--Transmitters and transmission--Fading, Gaussian processes
Format: Document (PDF)

Title: Performance analysis of a very fast packet switching system for broadband ISDN.
Creator: Rao, Radha Nallur Seshagiri., Florida Atlantic University, Ilyas, Mohammad, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: Rapid advances in technology have resulted in the evolution of Integrated Services Digital Networks (ISDNs) to Broadband ISDNs (BISDNs). This thesis discusses and evaluates the performance of a high speed and high capacity packet switching system architecture for BISDNs. This system supports various high speed communication services like data, voice, and video services. The main performance criterion is the mean switching delay, which is defined as the packet transfer delay through the bus...
Show moreRapid advances in technology have resulted in the evolution of Integrated Services Digital Networks (ISDNs) to Broadband ISDNs (BISDNs). This thesis discusses and evaluates the performance of a high speed and high capacity packet switching system architecture for BISDNs. This system supports various high speed communication services like data, voice, and video services. The main performance criterion is the mean switching delay, which is defined as the packet transfer delay through the bus and through the loop connecting various switch modules in the system. Other performance criteria are power and system throughput. The performance parameters are evaluated separately for both data and control (signaling) packets. The effects of the number of switch modules in the system, the data packet length, and the ratio of arrival rate of data to control packets are examined. It is observed that the switching delay and throughput increase with an increase in the traffic intensity for any number of switching modules and the ratio of arrival rate of data to control packets. The delay for data packets is found to be higher for lower values of this ratio and vice versa. The power is found to be maximum for about 70% load. The switching delay in this simulation model is found to be less than one millisecond for data packets.
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Date Issued: 1990
PURL: http://purl.flvc.org/fcla/dt/14603
Subject Headings: Packet switching (Data transmission), Integrated services digital networks, Broadband communication systems
Format: Document (PDF)

Title: Power-aware broadcasting and activity scheduling in ad hoc wireless networks using connected dominating sets.
Creator: Wu, Bing., Florida Atlantic University, Wu, Jie, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: In mobile ad hoc wireless networks (MANET), due to host mobility, broadcasting is expected to be frequently used to find a route to a particular host, to page a host, and to alarm all hosts. A straightforward broadcasting by flooding is usually very costly and results in substantial redundancy and more energy consumption. Power consumption is an important issue since most mobile hosts operate on battery. Broadcasting based on a connected dominating set (CDS) is a promising approach, where...
Show moreIn mobile ad hoc wireless networks (MANET), due to host mobility, broadcasting is expected to be frequently used to find a route to a particular host, to page a host, and to alarm all hosts. A straightforward broadcasting by flooding is usually very costly and results in substantial redundancy and more energy consumption. Power consumption is an important issue since most mobile hosts operate on battery. Broadcasting based on a connected dominating set (CDS) is a promising approach, where only nodes inside CDS need to relay the broadcast packet. Wu and Li proposed a simple distributed algorithm for calculating CDS in MANET. In general, nodes inside CDS consume more energy to handle various bypass traffics than nodes outside the set. To prolong the life span of each node and, hence, the network by balancing the energy consumption in the system, nodes should be alternated in being chosen to form a CDS. Activity scheduling deals with the way to rotate the role of each node among a set of given operation modes. In thesis I propose to apply power-aware CDS notions to broadcasting and activity scheduling. I also introduce distance rule and extended rules to further reduce broadcasting energy consumption. The effectiveness of the proposed method are confirmed through my simulation experiment.
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Date Issued: 2002
PURL: http://purl.flvc.org/fcla/dt/12958
Subject Headings: Mobile computing, Wireless communication systems, Electronic digital computers--Power supply
Format: Document (PDF)

Title: YACAD: Yet Another Congestion Avoidance Design for ATM-based networks.
Creator: Hsu, Sam, Florida Atlantic University, Ilyas, Mohammad, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: This dissertation proposes YACAD (Yet Another Congestion Avoidance Design for ATM-based Networks), a congestion prevention model that includes admission control, traffic shaping, and link-by-link flow control for ATM-based networks. Network traffic in this model is composed of real-time traffic and data traffic. As real-time traffic is delay-sensitive and connection-oriented, its call acceptance is based upon the effective bandwidth at all nodes. Effective bandwidth is defined as a vector of...
Show moreThis dissertation proposes YACAD (Yet Another Congestion Avoidance Design for ATM-based Networks), a congestion prevention model that includes admission control, traffic shaping, and link-by-link flow control for ATM-based networks. Network traffic in this model is composed of real-time traffic and data traffic. As real-time traffic is delay-sensitive and connection-oriented, its call acceptance is based upon the effective bandwidth at all nodes. Effective bandwidth is defined as a vector of bandwidth and maximum node delay. As data traffic can be either connection-oriented or connectionless, it is subject to link-by-link flow control based on a criterion known as effective buffer which is defined as a scalar of buffer size. Data traffic is not delay-sensitive but is loss-sensitive. Traffic shaping is imposed on real-time traffic to ensure a smooth inflow of real-time cells. YACAD also allocates a large buffer (fat bucket) to data traffic to accommodate sudden long bursts of data cells. Absence of data cell loss is a major feature of YACAD. Two simulation studies on the performance of the model are conducted. Analyses of the simulation results show that the proposed congestion avoidance model can achieve congestion-free networking and bounded network delays for real-time traffic at high levels of channel utilization. The maximum buffer requirements for loss-free cell delivery for data traffic, and the cell loss probabilities for real-time traffic are also obtained. In addition, results of performance comparisons to other similar models have shown that YACAD outperforms several other leaky-bucket based congestion control methods in terms of cell loss probability for real-time traffic. The simulation source program has also been verified using existing queueing theories, and the Paired-t Confidence Interval method with satisfactory results at 99% confidence level.
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Date Issued: 1993
PURL: http://purl.flvc.org/fcla/dt/12336
Subject Headings: Integrated services digital networks, Broadband communications systems, Packet switching (Data transmission), Computer networks--Management
Format: Document (PDF)

FAU Theses and Dissertations (28)	+ -
HBOI Faculty Contributions (4)	+ -
FAU College Collections (2)	+ -

Digital communications (13)	+ -
Wireless communication systems (10)	+ -
Integrated services digital networks (8)	+ -
Broadband communication systems (5)	+ -
Computer network protocols (4)	+ -

Underwater acoustic telemetry (4)	+ -
Asynchronous transfer mode (3)	+ -
Code division multiple access (3)	+ -
Data transmission systems (3)	+ -
Electronic digital computers--Power supply (3)	+ -
Mobile computing (3)	+ -
Packet switching (Data transmission) (3)	+ -
Signal processing (3)	+ -
Signal processing--Digital techniques (3)	+ -
Broadband communications systems (2)	+ -
Computer networks--Management (2)	+ -
Digital video (2)	+ -
Digital video. (2)	+ -
Mobile communication systems. (2)	+ -
Modulation (Electronics) (2)	+ -
Multimedia systems (2)	+ -
Radio--Transmitters and transmission--Fading (2)	+ -
Time division multiple access (2)	+ -
Underwater acoustics (2)	+ -
. (1)	+ -
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Artificial intelligence. (1)	+ -

Electronic Thesis or Dissertation (28)	+ -
article (6)	+ -

Florida Atlantic University (26)	+ -
College of Engineering and Computer Science (24)	+ -
Department of Computer and Electrical Engineering and Computer Science (22)	+ -
Ilyas, Mohammad (5)	+ -
Caimi, F. M. (4)	+ -

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