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(1 - 14 of 14)
- Title
- An advanced intelligent network: Description and performance evaluation.
- Creator
- Kadioglu, Ceri., Florida Atlantic University, Ilyas, Mohammad, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
An Advanced Intelligent Network (AIN) is described and its performance is evaluated in this thesis. First, the AIN architecture is presented. This is followed by the description of the operation and the creation of the telephone services in the AIN architecture. Finally, the AIN architecture is evaluated on the performance of the user-network interface and the network elements, and the expandability and cost effectiveness of the architecture. The result of the evaluation shows that the...
Show moreAn Advanced Intelligent Network (AIN) is described and its performance is evaluated in this thesis. First, the AIN architecture is presented. This is followed by the description of the operation and the creation of the telephone services in the AIN architecture. Finally, the AIN architecture is evaluated on the performance of the user-network interface and the network elements, and the expandability and cost effectiveness of the architecture. The result of the evaluation shows that the operation of the telephone services in the AIN architecture are acceptable according to the standards set by Bellcore. Therefore, the AIN architecture meets the objectives set by the telephone operating companies and provides a basis for faster development and deployment of new telephone services in a cost effective manner.
Show less - Date Issued
- 1991
- PURL
- http://purl.flvc.org/fcla/dt/14688
- Subject Headings
- Telecommunication systems, Telephone systems, Data transmission systems
- Format
- Document (PDF)
- Title
- Automated nursing knowledge classification using indexing.
- Creator
- Chinchanikar, Sucharita Vijay., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
Promoting healthcare and wellbeing requires the dedication of a multi-tiered health service delivery system, which is comprised of specialists, medical doctors and nurses. A holistic view to a patient care perspective involves emotional, mental and physical healthcare needs, in which caring is understood as the essence of nursing. Properly and efficiently capturing and managing nursing knowledge is essential to advocating health promotion and illness prevention. This thesis proposes a...
Show morePromoting healthcare and wellbeing requires the dedication of a multi-tiered health service delivery system, which is comprised of specialists, medical doctors and nurses. A holistic view to a patient care perspective involves emotional, mental and physical healthcare needs, in which caring is understood as the essence of nursing. Properly and efficiently capturing and managing nursing knowledge is essential to advocating health promotion and illness prevention. This thesis proposes a document-indexing framework for automating classification of nursing knowledge based on nursing theory and practice model. The documents defining the numerous categories in nursing care model are structured with the help of expert nurse practitioners and professionals. These documents are indexed and used as a benchmark for the process of automatic mapping of each expression in the assessment form of a patient to the corresponding category in the nursing theory model. As an illustration of the proposed methodology, a prototype application is developed using the Latent Semantic Indexing (LSI) technique. The prototype application is tested in a nursing practice environment to validate the accuracy of the proposed algorithm. The simulation results are also compared with an application using Lucene indexing technique that internally uses modified vector space model for indexing. The result comparison showed that the LSI strategy gives 87.5% accurate results compared to the Lucene indexing technique that gives 80% accuracy. Both indexing methods maintain 100% consistency in the results.
Show less - Date Issued
- 2009
- PURL
- http://purl.flvc.org/FAU/186677
- Subject Headings
- Nursing, Computer-assisted instruction, Data transmission systems, Outcome assessment (Medical care), Nursing assessment, Digital techniques
- Format
- Document (PDF)
- Title
- Broadband-ISDN signaling: Protocol description and enhancements for future services.
- Creator
- Vasi, Idris Taher., Florida Atlantic University, Lobo, Andrea, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
Broadband-ISDN Network Architecture and Signaling concepts are described with particular emphasis on Asynchronous Transfer Mode (ATM) technology. A consolidated view of various aspects of B-ISDN/ATM Access and Network Signaling functions, architecture and protocols is presented. Additionally, a suggested evolutionary growth path for the B-ISDN signaling protocols is summarized. This is followed by a high-level comparison of two protocols under consideration for network signaling. The result...
Show moreBroadband-ISDN Network Architecture and Signaling concepts are described with particular emphasis on Asynchronous Transfer Mode (ATM) technology. A consolidated view of various aspects of B-ISDN/ATM Access and Network Signaling functions, architecture and protocols is presented. Additionally, a suggested evolutionary growth path for the B-ISDN signaling protocols is summarized. This is followed by a high-level comparison of two protocols under consideration for network signaling. The result of this evaluation indicates that the requirements of network signaling are best met by a protocol stack based on SS7 concepts. Finally, a set of future B-ISDN and Multimedia services is presented in context of the requirements they would impose on the signaling protocols. Enhancements to the access signaling protocol are proposed for the support of multiconnection and/or multiparty calls. These extensions/enhancements consist of a set of simplified messages, information elements and procedures based on message flows. Evolution and backward compatibility to existing protocols are taken into account while developing the extensions.
Show less - Date Issued
- 1994
- PURL
- http://purl.flvc.org/fcla/dt/15016
- Subject Headings
- Asynchronous transfer mode, Computer network architectures, Broadband communication systems, Data transmission systems, Computer network protocols, Integrated services digital networks
- Format
- Document (PDF)
- Title
- Comparison of different realizations and adaptive algorithms for channel equalization.
- Creator
- Kamath, Anuradha K., Florida Atlantic University, Sudhakar, Raghavan, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
This thesis presents simulation results comparing the performance of different realizations and adaptive algorithms for channel equalization. An attempt is made to study and compare the performance of some filter structures used as an equalizer in fast data transmission over the baseband channel. To this end, simulation experiments are performed using minimum and non minimum phase channel models with adaptation algorithms such as the least mean square (LMS) and recursive least square (RLS)...
Show moreThis thesis presents simulation results comparing the performance of different realizations and adaptive algorithms for channel equalization. An attempt is made to study and compare the performance of some filter structures used as an equalizer in fast data transmission over the baseband channel. To this end, simulation experiments are performed using minimum and non minimum phase channel models with adaptation algorithms such as the least mean square (LMS) and recursive least square (RLS) algorithms, filter structures such as the lattice and transversal filters and the input signals such as the binary phase shift keyed (BPSK) and quadrature phase shift keyed (QPSK) signals. Based on the simulation studies, conclusions are drawn regarding the performance of various adaptation algorithms.
Show less - Date Issued
- 1993
- PURL
- http://purl.flvc.org/fcla/dt/14974
- Subject Headings
- Computer algorithms, Data transmission systems, Equalizers (Electronics)
- Format
- Document (PDF)
- Title
- Design and implementation of a wireless ad hoc network.
- Creator
- Neelakanta, Mahesh., Florida Atlantic University, Hsu, Sam, Ilyas, Mohammad, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
This thesis addresses issues faced in the practical implementation of a wireless ad hoc network (WAHN) protocol for data transmission. This study focuses on: (1) Evaluating existing hardware and software options available for the WAHN implementation. (2) Appraising the issues faced while implementing a practical wireless ad hoc protocol. (3) Applying a set of MAC protocol specifications developed for a wireless ad hoc data network to a practical test network. Specific to the above topics of...
Show moreThis thesis addresses issues faced in the practical implementation of a wireless ad hoc network (WAHN) protocol for data transmission. This study focuses on: (1) Evaluating existing hardware and software options available for the WAHN implementation. (2) Appraising the issues faced while implementing a practical wireless ad hoc protocol. (3) Applying a set of MAC protocol specifications developed for a wireless ad hoc data network to a practical test network. Specific to the above topics of interest, the following research tasks are performed: (1) An elaborate survey and relevant discussions on wireless MAC protocols. (2) A comprehensive study comparing various wireless transceivers is performed. Range, data rate, frequency, interfacing method and cost are the factors compared. (3) A simple, low-cost and low baud-rate transceiver is modified with appropriate interface circuits to support wireless communications. A more advanced transceiver is also considered and used for the software foundation of a practical implementation of the ad hoc and MAC protocols. The studies enable assessing the problems faced during the implementation and suggest solutions to resolve these problems. Further areas for study are also discussed.
Show less - Date Issued
- 1998
- PURL
- http://purl.flvc.org/fcla/dt/15615
- Subject Headings
- Wireless communication systems, Data transmission systems, Computer networks
- Format
- Document (PDF)
- Title
- A feedback-based multimedia synchronization technique for distributed systems.
- Creator
- Ehley, Lynnae Anne., Florida Atlantic University, Ilyas, Mohammad, Furht, Borko, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
Multimedia applications incorporate the use of more than one type of media, i.e., voice, video, data, text and image. With the advances in high-speed communication, the ability to transmit multimedia is becoming widely available. One of the means of transport for multimedia in distributed networks is Broadband Integrated Services Digital Network (B-ISDN). B-ISDN supports the transport of large volumes of data with a low error rate. It also handles the burstiness of multimedia traffic by...
Show moreMultimedia applications incorporate the use of more than one type of media, i.e., voice, video, data, text and image. With the advances in high-speed communication, the ability to transmit multimedia is becoming widely available. One of the means of transport for multimedia in distributed networks is Broadband Integrated Services Digital Network (B-ISDN). B-ISDN supports the transport of large volumes of data with a low error rate. It also handles the burstiness of multimedia traffic by providing dynamic bandwidth allocation. When multimedia is requested for transport in a distributed network, different Quality of Service (QOS) may be required for each type of media. For example, video can withstand more errors than voice. In order to provide, the most efficient form of transfer, different QOS media are sent using different channels. By using different channels for transport, jitter can impose skews on the temporal relations between the media. Jitter is caused by errors and buffering delays. Since B-ISDN uses Asynchronous Transfer Mode (ATM) as its transfer mode, the jitter that is incurred can be assumed to be bounded if traffic management principles such as admission control and resource reservation are employed. Another network that can assume bounded buffering is the 16 Mbps token-ring LAN when the LAN Server (LS) Ultimedia(TM) software is applied over the OS/2 LAN Server(TM) (using OS/2(TM)). LS Ultimedia(TM) reserves critical resources such as disk, server processor, and network resources for multimedia use. In addition, it also enforces admission control(1). Since jitter is bounded on the networks chosen, buffers can be used to realign the temporal relations in the media. This dissertation presents a solution to this problem by proposing a Feedback-based Multimedia Synchronization Technique (FMST) to correct and compensate for the jitter that is incurred when media are received over high speed communication channels and played back in real time. FMST has been implemented at the session layer for the playback of the streams. A personal computer was used to perform their synchronized playback from a 16 Mbps token-ring and from a simulated B-ISDN network.
Show less - Date Issued
- 1994
- PURL
- http://purl.flvc.org/fcla/dt/12382
- Subject Headings
- Multimedia systems, Broadband communication systems, Data transmission systems, Integrated services digital networks, Electronic data processing--Distributed processing
- Format
- Document (PDF)
- Title
- GENERIC NETWORK EXECUTIVE.
- Creator
- SARMIENTO, JESUS LEOPOLDO., Florida Atlantic University, Fernandez, Eduardo B., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
A Generic Network Executive (GNE) package is presented in this thesis. It encompasses the strategy and methodology to follow when implementing data communication software. GNE was designed for portability and high utilization of available resources (efficiency). It does not impose implementation constraints because it does not include features specific to any system (hardware or operating system}. It uses a highly concurrent process model with a pipelined structure . It is not protocol...
Show moreA Generic Network Executive (GNE) package is presented in this thesis. It encompasses the strategy and methodology to follow when implementing data communication software. GNE was designed for portability and high utilization of available resources (efficiency). It does not impose implementation constraints because it does not include features specific to any system (hardware or operating system}. It uses a highly concurrent process model with a pipelined structure . It is not protocol dependent, rather it is meant to be used to implement low level services for higher level communic ation protocols. It is intended to provide interprocess communication in distributed systems by coupling application programs with a general purpose packet delivery system, i.e., a datagram service.
Show less - Date Issued
- 1986
- PURL
- http://purl.flvc.org/fcla/dt/14321
- Subject Headings
- Computer networks, Data transmission systems
- Format
- Document (PDF)
- Title
- Information-theoretic aspects of local access techniques/ADSL with or without ATM-centric considerations.
- Creator
- Preechayasomboon, Apiruck., Florida Atlantic University, Neelakanta, Perambur S., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
The research proposed and elaborated in this dissertation is concerned with the development of new and smart techniques for subchannel allocation in the asymmetric digital subscriber lines (ADSLs). The ADSL refers to a class of access technology adopted currently in modern telecommunications to make use of the available channel capacity on the twisted copper-wires, which exist in the "last-mile" between the central office and subscribers. This available spectrum on the voice grade copper...
Show moreThe research proposed and elaborated in this dissertation is concerned with the development of new and smart techniques for subchannel allocation in the asymmetric digital subscriber lines (ADSLs). The ADSL refers to a class of access technology adopted currently in modern telecommunications to make use of the available channel capacity on the twisted copper-wires, which exist in the "last-mile" between the central office and subscribers. This available spectrum on the voice grade copper-lines is judiciously used to transport broadband data over the last mile regime. For this purpose, the channel capacity on the access lines is segmented in subchannels and the traffic to be transported is placed on the subchannels matching the bit-rates of the traffic to the subchannel capacity (as dictated by Hartley-Shannon law). The available subchannels for downstream and upstreams are of different extents (640 kbps for upstream and 9 Mbps for downstream); and, hence are qualified as asymmetric transports. Relevant to the subchannel allocation as above, the specific research, carried out can be enumerated as follows: (1) Development of a subchannel allocation metric (SAM) on the basis of information-theoretic considerations and duly accounting for noise/interference effects on the access lines and BER-based information-impairments on the trunks (feeding the access lines); (2) Use of SAM as an algorithmic support to train an artificial neural network (ANN), which is facilitated at the ADSL modem performing subchannel allocation. A new version of ANN training (and subchannel allocation prediction) strategies is developed by implementing the ANN operation in the entropy-plane. This technique allows a fast convergence of the ANN compatible for telecommunication transports. The incorporation of ANN in the modem renders the subchannel allocation smart; (3) Fuzzy considerations are also included in the ANN indicated above and operation of ADSL modem is then tuned to function as an intelligent neuro inference engine in its efforts towards subchannel allocation; (4) ATM support on ADSL lines is investigated and a scheme for allocating the permanent and switched virtual circuits (supporting ATM specified traffic) on the subchannels of access lines is developed. Relevant call-blocking probabilities are assessed; (5) Lastly, the EMI/RFI, and crosstalks on access lines are studied in the framework of practical considerations and mitigatory efforts are suggested thereof. Simulated results using data commensurate with practical aspects of ADSL transport are furnished and discussed. Background literature is comprehensively presented chapterwise and scope for future work is identified via open questions in the concluding chapter.
Show less - Date Issued
- 2000
- PURL
- http://purl.flvc.org/fcla/dt/12652
- Subject Headings
- Data transmission systems, Asynchronous transfer mode, Information theory
- 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.
Show less - 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
- IPTV on copper-lines converging into "all-optical" trunk transport: A next-generation local-loop solution.
- Creator
- Perez, Angela S., Florida Atlantic University, Neelakanta, Perambur S., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
A promising next-generation version of service that could be availed from local exchange carriers (LECs) refers to streaming Internet protocol based television (IPTV) programs into subscriber premises via traditional copper pairs. The present study addresses provisioning economically-budgeted and optimally-engineered bit rates (EBRs) in implementing IPTV technology in the local-loop via copper-pairs using the so-called (ADSL2/ADSL2+) technology (with high-speed/large bandwidth considerations...
Show moreA promising next-generation version of service that could be availed from local exchange carriers (LECs) refers to streaming Internet protocol based television (IPTV) programs into subscriber premises via traditional copper pairs. The present study addresses provisioning economically-budgeted and optimally-engineered bit rates (EBRs) in implementing IPTV technology in the local-loop via copper-pairs using the so-called (ADSL2/ADSL2+) technology (with high-speed/large bandwidth considerations plus copper-bonding for bandwidth sharing capabilities). Also studied is the way to extend the backhaul transport of IPTV on copper-lines (plus any other local-loop transmissions that may co-exist) onto an "all-optical" trunk of the inter-office facilities (IOFs) in the edge/core network cloud of the telcos. A model of a core network topology is analyzed for traffic considerations so as to decide on blocking probability at a specified egress node under different conditions of burstiness. The problems posed are analyzed via computations/simulations on Matlab(TM) (v6.5). Inferential remarks are gathered, conclusions are drawn and open-questions yet to be researched are indicated.
Show less - Date Issued
- 2006
- PURL
- http://purl.flvc.org/fcla/dt/13395
- Subject Headings
- Telecommunication wiring, Data transmission systems, TCP/IP (Computer network protocol)
- Format
- Document (PDF)
- Title
- PERFORMANCE EVALUATION OF THE EFFECTS OF MESSAGE SEGMENTATION IN TANDEM NODE COMPUTER NETWORKS.
- Creator
- LAMANNA, PETER JOHN., Florida Atlantic University, Ilyas, Mohammad, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
Analytical and simulation performance evaluation results are presented on the effects of message segmentation and the validity of the Independence Assumption when applied to analytically modeling tandem node computer networks. Simulation results indicate that increasing message segmentation threshold will increase the network traffic intensity and consequently the total packet delay. Simulation and analytical results for total packet delay compared well only at low traffic intensities. At...
Show moreAnalytical and simulation performance evaluation results are presented on the effects of message segmentation and the validity of the Independence Assumption when applied to analytically modeling tandem node computer networks. Simulation results indicate that increasing message segmentation threshold will increase the network traffic intensity and consequently the total packet delay. Simulation and analytical results for total packet delay compared well only at low traffic intensities. At higher traffic intensities the discrepancy is due to the Independence Assumption since it does not account for the increasing dependency of interarrival times and service times as packets are made to wait at the nodes.
Show less - Date Issued
- 1986
- PURL
- http://purl.flvc.org/fcla/dt/14327
- Subject Headings
- Computer networks, Data transmission systems
- Format
- Document (PDF)
- Title
- QoS Driven Communication Backbone for NOC Based Embedded Systems.
- Creator
- Agarwal, Ankur, Shankar, Ravi, Florida Atlantic University, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
With the increasing complexity of the system design, it has become very critical to enhance system design productivity to meet with the time-to-market demands. Real Time embedded system designers are facing extreme challenges in underlying architectural design selection. It involves the selection of a programmable, concurrent, heterogeneous multiprocessor architecture platform. Such a multiprocessor system on chip (MPSoC) platform has set new innovative trends for the real-time systems and...
Show moreWith the increasing complexity of the system design, it has become very critical to enhance system design productivity to meet with the time-to-market demands. Real Time embedded system designers are facing extreme challenges in underlying architectural design selection. It involves the selection of a programmable, concurrent, heterogeneous multiprocessor architecture platform. Such a multiprocessor system on chip (MPSoC) platform has set new innovative trends for the real-time systems and system on Chip (SoC) designers. The consequences of this trend imply the shift in concern from computation and sequential algorithms to modeling concurrency, synchronization and communication in every aspect of hardware and software co-design and development. Some of the main problems in the current deep sub-micron technologies characterized by gate lengths in the range of 60-90 nm arise from non scalable wire delays, errors in signal integrity and un-synchronized communication. These problems have been addressed by the use of packet switched Network on Chip (NOC) architecture for future SoCs and thus, real-time systems. Such a NOC based system should be able to support different levels of quality of service (QoS) to meet the real time systems requirements. It will further help in enhancing the system productivity by providing a reusable communication backbone. Thus, it becomes extremely critical to properly design a communication backbone (CommB) for NOC. Along with offering different levels of QoS, CommB is responsible directing the flow of data from one node to another node through routers, allocators, switches, queues and links. In this dissertation I present a reusable component based, design of CommB, suitable for embedded applications, which supports three types of QoS (real-time, multi-media and control applications).
Show less - Date Issued
- 2006
- PURL
- http://purl.flvc.org/fau/fd/FA00012566
- Subject Headings
- Computer networks--Quality control, Data transmission systems, Embedded computer systems--Quality control, Interconnects (Integrated circuit technology)
- Format
- Document (PDF)
- Title
- Simulation study of beacon time synchronization algorithm in low rate wireless personal area networks.
- Creator
- Shrivastav, Madhu., Florida Atlantic University, Mahgoub, Imad, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
In a beacon-enabled network, nodes send beacons when they are ready to transmit or receive messages from the other sensors in their communication range. If the beacons are not synchronized in time, a sensor might receive more than one beacon and hence will not be able to demodulate the beacon, thereby, being isolated from the network. As a result coverage nulls are introduced in the system. To address the above mentioned issues, Motorola Labs have proposed an algorithm for synchronizing the...
Show moreIn a beacon-enabled network, nodes send beacons when they are ready to transmit or receive messages from the other sensors in their communication range. If the beacons are not synchronized in time, a sensor might receive more than one beacon and hence will not be able to demodulate the beacon, thereby, being isolated from the network. As a result coverage nulls are introduced in the system. To address the above mentioned issues, Motorola Labs have proposed an algorithm for synchronizing the beacons in a wireless personal area network. In this thesis, extensive study of the proposed beacon time synchronization algorithm is done using OPNET as a simulation tool. Simulation is carried out by designing a detailed model of the algorithm using IEEE 802.15.4 as a reference. In depth analysis of the simulation results has been carried out. The results obtained are compared with those of existing time synchronization methods.
Show less - Date Issued
- 2005
- PURL
- http://purl.flvc.org/fcla/dt/13227
- Subject Headings
- Wireless LANs, Extranets (Computer networks), Wireless communication systems, Data transmission systems, Computer network protocols, Home computer networks
- Format
- Document (PDF)
- Title
- Specialized communications processor for layered protocols.
- Creator
- Mandalia, Baiju Dhirajlal., Florida Atlantic University, Ilyas, Mohammad, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
This dissertation describes an architecture for a special purpose communications protocol processor (CPP) that has been developed for open systems interconnection (OSI) type layered protocol processing. There exists a performance problem with the implementation and processing of communication protocols and the problem can have an impact on the throughput of future network interfaces. This problem revolves around two issues, (i) communication processing bottlenecks to fully utilize high speed...
Show moreThis dissertation describes an architecture for a special purpose communications protocol processor (CPP) that has been developed for open systems interconnection (OSI) type layered protocol processing. There exists a performance problem with the implementation and processing of communication protocols and the problem can have an impact on the throughput of future network interfaces. This problem revolves around two issues, (i) communication processing bottlenecks to fully utilize high speed transmission mediums; (ii) mechanism used in the implementation of communications functions. It is the objective of this work to address this problem and develop a first of its kind processor that is dedicated to protocol processing. At first trends in computer communications technology are discussed along with issues that influence throughput in front end controllers for network interfaces that support OSI. Network interface requirements and a survey of existing technology are presented and the state of the art of layered communication is evaluated and specific parameters that contribute to the performance of communications processors are identified. Based on this evaluation a new set of instructions is developed to support the necessary functions. Each component of the new architecture is explained with respect to the mechanism for implementation. The CPP contains special-purpose circuits dedicated to quick performance (e.g. single machine cycle execution) of functions needed to process header and frame information, functions which are repeatedly encountered in all protocol layers, and instructions designed to take advantage of these circuits. The header processing functions include priority branch determination functions, register bit reshaping (rearranging) functions, and instruction address processing functions. Frame processing functions include CRC (cyclic redundancy check) computations, bit insertion/deletion operations and special character detection operations. Justifications for new techniques are provided and their advantages over existing technology are discussed. A hardware register transfer level model is developed to simulate the new architecture for path length computations. A performance queueing model is also developed to analyze the processor characteristics with various load parameters. Finally, a brief discussion indicates how such a processor would apply to future network interfaces along with possible trends.
Show less - Date Issued
- 1989
- PURL
- http://purl.flvc.org/fcla/dt/11933
- Subject Headings
- Computer network protocols, Computer networks, Data transmission systems
- Format
- Document (PDF)
