International Telemetering Conference Proceedings / October 28-31, 1996 / Town and Country Hotel and Convention Center, San Diego, California / With every new spacecraft that is designed comes a greater density of information that will be stored once it is in operation. This, coupled with the desire to reduce the number of ground stations needed to download this information from the spacecraft, places new requirements on telemetry transmitters. These new transmitters must be capable of data rates of 320 Mbps and beyond. Although the necessary bandwidth is available for some non-bandwidth-limited transmissions in Ka-Band and above, many systems will continue to rely on more narrow allocations down to X-Band. These systems will require filtering of the modulation to meet spectral limits. The usual requirements of this filtering also include that it not introduce high levels of inter-symbol interference (ISI) to the transmission. These constraints have been addressed at CE by implementing a DSP technique that pre-filters a QPSK symbol set to achieve bandwidth-limited 320 Mbps operation. This implementation operates within the speed range of the radiation-hardened digital technologies that are currently available and consumes less power than the traditional high-speed FIR techniques.

International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California / TSI TelSys, Inc. is in the process of developing a production level, continuously tunable satellite receiver designed to support multiple high data rate, low earth and geostationary orbit missions in the 20 Mbps to 800 Mbps composite QPSK data rate range. This paper will evaluate market demands on satellite receivers and outline receiver design technique as a solution to high rate, multi-mission support.

International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, California / This paper overviews the High Explosive Radio Telemetry (HERT) system, under co-development by Los Alamos National Laboratories and AlliedSignal Federal Manufacturing & Technologies. This telemetry system is designed to measure the initial performance of an explosive package under flight environment conditions, transmitting data from up to 64 sensors. It features high speed, accurate time resolution (10 ns) and has the ability to complete transmission of data before the system is destroyed by the explosion. In order to affect the resources and performance of a flight delivery vehicle as little as possible, the system is designed such that physical size, power requirements, and antenna demands are as small as possible.

International Telemetering Conference Proceedings / October 30-November 02, 1995 / Riviera Hotel, Las Vegas, Nevada / A Communication Subsystem has been developed capable of 25 Megasymbol per Second (MSPS) data rates. The unit operates in the 8300 to 8400 MHz band and uses shaped QPSK for excellent spectral containment properties. The Communication Subsystem (CSS) has a number of features which make it attractive for many applications: (1) Data is convolutionally encoded inside the transmitter resulting in excellent link performance without using external hardware. (2) Data is encrypted inside the transmitter. The DES standard is currently implemented, however, military encryption is an option which requires minimal changes in the CSS design. (3) Frame Synchronization Sequences and Block Identification Numbers are inserted into the data by the CSS. (4) Cyclic Redundancy Checked Codes for each data block are generated within the CSS. (5) Health and Status of the CSS is formatted into digital words. (6) Mode Control, Key Maintenance, and Health and Status Reporting is easily handled through an RS-422 interface. (7) The CSS is ruggedized for launch environments and is highly reliable for space applications.

<p>This thesis work investigates the effects of crosstalk on on-chip interconnects. We use optimal repeater insertion as a reference and derive analytical expressions for signal latency, maximum data-rate and power consumption. Through calculations and simulations we show that despite large uncertainties in arrival time of a signal that is subject to crosstalk, we are able to make predictions about the maximum data-rate on a bus. We also show that data-rates can exceed the classical limit of the latency inverted by using wave pipelining. To increase the data-rate, we can increase the number of repeaters to a limit, at the cost of additional latency and power. Savings in power consumption can be achieved by using fewer repeaters, paying in latency and data-rate. Through fewer repeaters, the top metal layer shows better performance in all investigated aspects.</p>

This thesis work investigates the effects of crosstalk on on-chip interconnects. We use optimal repeater insertion as a reference and derive analytical expressions for signal latency, maximum data-rate and power consumption. Through calculations and simulations we show that despite large uncertainties in arrival time of a signal that is subject to crosstalk, we are able to make predictions about the maximum data-rate on a bus. We also show that data-rates can exceed the classical limit of the latency inverted by using wave pipelining. To increase the data-rate, we can increase the number of repeaters to a limit, at the cost of additional latency and power. Savings in power consumption can be achieved by using fewer repeaters, paying in latency and data-rate. Through fewer repeaters, the top metal layer shows better performance in all investigated aspects.

To achieve two main objectives, viz., to increase the system capacity and having higher data rates, of 3G system for individual users, it comes up to be the unprecedented demand on both communication bandwidth and powerful DSP processing techniques. In this thesis, a new space-time encoding scheme, referred to as the Virtual Constellation Mapping (VCM) scheme associated with the turbo encoder, is devised to enhance transmission data rate and spectral efficiency. It also alleviates the requirement of powerful signal processing technique. In fact, the proposed scheme is very simple and could be used to achieve full utilizing encoding efficiency. It means that the new scheme is easy in practical implementation. To verify the advantages of this new scheme, we apply it to both the 3GPP FDD of WCDMA system and OFDM based Wireless LAN system. First, by comparing the proposed scheme with the conventional standards 3GPP scheme, the information data rate is increased from 384 kbps information data rate to 450.4 kbps, that is 17 % improvement. It should be noted by using the new approach, other system components of 3GPP, e.g., modulation scheme, control bits and the data rate of the QPSK modulators outputs, are all the same. Moreover, this VCM scheme can be applied to the multicarrier modulation or the Wireless LAN with the OFDM modulation. Computer simulation results showed that with the same transmission data rate, our scheme is more robustness compare with the conventional space-time trellis coded OFDM scheme, in high Doppler fading channel. In addition, the proposed scheme required less decoding complexity as the standards, when it is implemented in the 3GPP system and the OFDM system with space-time trellis coding scheme.

With the increase in mobile broadband services the operators are gaining profits by providing high speed Internet access over the mobile network. On the other side they are also facing challenges to give QoS guarantee to the customers. In this thesis we investigate the impact of data rate and payload size on One Way Delay (OWD) and packet loss over TCP performance in 3G networks. Our goal is to evaluate the OWD and packet loss characteristics with respect to payload size and data rate from the collected network level traces. To collect these traces an experimental testbed is setup with Endace Data Acquisition and Generation (DAG) cards, for accurate measurements Endace DAG cards together with Global Positioning System (GPS) synchronization is implemented. The experiments are conducted for three different Swedish mobile operator networks and further the statistics of OWD measurements and packet loss for different data rates and payload sizes are evaluated. Our results indicate that the minimal OWD occurred at higher data rates and also shows a high delay variability. The packet loss has much impact on higher data rates and larger payload sizes, as the packet loss increases with the increase in data rate and payload size.

The aim of the work is to develop an evaluation platform for comunnication on CAN FD bus. This evaluation platform is mainly intended to be used for the application support of the NCV7344 CAN transceiver on given module. The main part of the work is to develop firmware for SAM V71 microcontroller and a control application software for computer. This control application will serve to setup the communication parameters, send and receive data and control communication in the testing network. Attention is also paid to develop and test effectiveness of signal improvement circuits and their impact on bit error rate in real conditions on designed evaluation network.

Several heterogeneous, intelligent and distributed devices can be connected to interact with one another over the internet in what is known as the internet of things (IoT). Also, the concept of IoT can be exploited in the industrial environment for increasing the production output of goods and services and for mitigating the risk of disaster occurrences. This application of IoT for enhancing industrial production is known as industrial IoT (IIoT). More so, the benefits of IoT technology can be particularly exploited across the maritime industry in what is termed the internet of maritime things (IoMT) where sensors and actuator devices are implanted on marine equipment in order to foster the communication efficacy of nautical radio networks. Marine explorations may suffer from unwanted situations such as transactional delays, environmental degradation, insecurity, seaport congestions, accidents and collisions etc, which could arise from severe environmental conditions. As a result, there is a need to develop proper communication techniques that will improve the overall quality of service (QoS) and quality of experience (QoE) of marine users. To address these, the merits of contemporaneous technologies such as ubiquitous computing, software-defined networking (SDN) and network functions virtualization (NFV) in addition to salubrious communication techniques including emergent configurations (EC), channel estimation (CE) and communication routing protocols etc, can be utilized for sustaining optimal operation of pelagic networks. Emergent configuration (EC) is a technology that can be adapted into maritime radio networks to support the operation and collaboration of IoT connected devices in order to improve the efficiency of the connected IoT systems for maximum user satisfaction. To meet user goals, the connected devices are required to cooperate with one another in an adaptive, interoperable, and homogeneous manner. In this thesis, a survey on the concept of IoT is presented in addition to a review of IIoT systems. The applications of ubiquitous computing and SDN technology are employed to design a newfangled network architecture which is specifically propounded for enhancing the throughput of oil and gas production in the maritime ecosystem. The components of this architecture work in collaboration with one another by attempting to manage and control the exploration process of deep ocean activities especially during emergencies involving anthropogenic oil and gas spillages. Several heterogeneous, intelligent and distributed devices can be connected to interact with one another over the internet in what is known as the internet of things (IoT). Also, the concept of IoT can be exploited in the industrial environment for increasing the production output of goods and services and for mitigating the risk of disaster occurrences. This application of IoT for enhancing industrial production is known as industrial IoT (IIoT). More so, the benefits of IoT technology can be particularly exploited across the maritime industry in what is termed the internet of maritime things (IoMT) where sensors and actuator devices are implanted on marine equipment in order to foster the communication efficacy of nautical radio networks. Marine explorations may suffer from unwanted situations such as transactional delays, environmental degradation, insecurity, seaport congestions, accidents and collisions etc, which could arise from severe environmental conditions. As a result, there is a need to develop proper communication techniques that will improve the overall quality of service (QoS) and quality of experience (QoE) of marine users. To address these, the merits of contemporaneous technologies such as ubiquitous computing, software-defined networking (SDN) and network functions virtualization (NFV) in addition to salubrious communication techniques including emergent configurations (EC), channel estimation (CE) and communication routing protocols etc, can be utilized for sustaining optimal operation of pelagic networks. Emergent configuration (EC) is a technology that can be adapted into maritime radio networks to support the operation and collaboration of IoT connected devices in order to improve the efficiency of the connected IoT systems for maximum user satisfaction. To meet user goals, the connected devices are required to cooperate with one another in an adaptive, interoperable, and homogeneous manner. In this thesis, a survey on the concept of IoT is presented in addition to a review of IIoT systems. The applications of ubiquitous computing and SDN technology are employed to design a newfangled network architecture which is specifically propounded for enhancing the throughput of oil and gas production in the maritime ecosystem. The components of this architecture work in collaboration with one another by attempting to manage and control the exploration process of deep ocean activities especially during emergencies involving anthropogenic oil and gas spillages. On the other hand, CE is a utilitarian communication technique that can be exploited during maritime exploration processes which offer additional reinforcement to the capacities of the nautical radio network. This technique enables the receivers of deep-sea networks to efficiently approximate the channel impulse response (CIR) of the wireless communication channel so that the effects of the communication channel on the transmitting aggregated cluster head information can be proficiently understood and predicted for useful decision-making procedures. Two CE schemes named inter-symbol interference/ average noise reduction (ISI/ANR) and reweighted error-reducing (RER) are designed in this study for estimating maritime channels for supporting the communication performances of nautical radio networks in both severe and light-fading environmental conditions. In the proposed RER method, the Manhattan distance of the CIR of an orthodox adaptive estimator is taken, which is subsequently normalised by a stability constant ɛ whose responsibility is for correcting any potential numerical system instability that may arise during the updating stages of the estimation process. To decrease the received signal error, a log-sum penalty function is eventually multiplied by an adjustable leakage (ɛ ) ̈that provides additional stability to the oscillating channel behaviour. The performance of the proposed RER method is further strengthened and made resilient against channel effects by the introduction of a reweighting attractor that further contracts the mean square error of this proposed estimator. In the ISI/ANR technique, the effects of possible ISI that may arise from maritime transmissions is considered and transformed using a low-pass filter that is incorporated for eliminating the effects of channel noise possible effects of multipath propagation. The RER scheme offered superior CE performances in comparison to other customary techniques such as the adaptive recursive least squares and normalised least mean square method in addition to conventional linear approaches such as least squares, linear minimum mean square error and maximum-likelihood estimation method. The proposed ISI/ANR technique offered an improved MSE performance in comparison to all considered linear methods. Finally, from this study, we were able to establish that accurate CE methods can improve the QoS and QoE of nautical radio networks in terms of network data rate and system outage probability. / Thesis (PhD (Computer Engineering))--University of Pretoria, 2021. / University of Pretoria Doctoral research grant, South African National Research Foundation/Research and Innovation Support and Advancement (NRF/RISA) research grant. Center for Connected Intelligence, Advanced Sensor Networks research group, University of Pretoria. / Electrical, Electronic and Computer Engineering / PhD (Computer Engineering) / Unrestricted