Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 26 for “"Time Division Multiple Access (TDMA)"”.
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Low computational complexity bit error rate simulation for personal communications systems in multipath and fading environments
… the performance of future wireless digital multiple access standards for fast and slow moving vehicles in outdoor environments. Code Division Multiple Access (CDMA) and Time Division Multiple Access (TDMA) are both multiple access techniques for wireless systems that can support …
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Simulation Study of Local Multipoint Distribution Service
… to examine the performance of two different multiple access schemes and two different duplexing schemes. LMDS is a broadband wireless point-to-multipoint access network that aims to improve network access capacity for end-users by solving the "last mile" problem. This study involves building …
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Impact of processing energy on the capacity of wireless channels
… perform our study in terms of power per unit of time, or energy. Traditional in- formation theoretic energy constraints consider only the energy used for transmission purposes. We study optimal transmission strategies by explicitly taking into account the energy expended by processes other than …
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Design of Media Access Control Schemes for Performance Enhancement of Future Generation Wireless Systems
… resource. WLAN devices utilize a complex medium access control (MAC) mechanism to allow multiple users to share the wireless resource. The distributed coordination function (DCF) is the most commonly used multiple access scheme in WLANs and a member of the 802.11 standard [1]. In this thesis, two …
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Integration of Wireless Sensor Network with CubeSat Satellite System for Enhanced Agricultural Monitoring
… protocol that combines randomized backoff with a Time Division Multiple Access (TDMA) style slotting. A simulation was developed that shows a gateway discovery model (effective slot budget B, per-window randomized access, deterministic polling once discovered) with an implementation of a …
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Fast Chirped Signals for a TDMA Ultrasonic Indoor Positioning System
… In order to incorporate more transmitters, a time-division multiple access (TDMA) scheme is applied to ensure orthogonality of signals. The concept includes four ultrasonic transmitters and a single receiver, which can uniquely identify each transmitter by a distinct signal sweep. Linear chirp …
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Design of the control systems operations for the Iridium satellite system
… Groupe Speciale Mobile (GSM), a combination of time division mUltiple access, TDMA, and frequency division multiple access, FDMA, is recommended for use by Iridium. A bus topology with a fiber backbone is suggested to support the operations at each facility and a separate landline is considered …
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Advances in integrating autonomy with acoustic communications for intelligent networks of marine robots
… messages based both on overall importance and time sensitivity; 3) Time Division Multiple Access (TDMA) Medium Access Control (MAC) with automatic discovery; and 4) an abstract acoustic modem driver. Building on this networking framework, two approaches that use the vehicle’s “intelligence” to …
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Optimal Hybrid MIMO Beamforming Designs for Energy-Efficient Communication Systems
… the carbon footprint. In this context, hybrid multiple-input multiple-output (MIMO) beamforming designs emerge as a crucial solution for achieving energy-efficient communication systems. These designs leverage low-complexity, low-cost, and low-power applications, primarily due to the use of …
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Optimisation and algorithms in wireless networks for mission critical applications
… two interfering users in an Orthogonal Frequency Division Multiple Access (OFDMA)-based cooperative base stations and (b) event-region detection in Wireless Sensor Networks (WSNs). The first area of work makes contribution on problem of maximising the sum rate of two interfering users, while …
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Multiple access protocols for multichannel communication systems
… In this thesis, we introduce the concept of multiple access communication and the need to use efficient transmission techniques to expand both present and future wireless communication networks. We will study two areas regarding multiple access on multichannel communication systems. First, we …
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Advances in integrating autonomy with acoustic communications for intelligent networks of marine robots
… messages based both on overall importance and time sensitivity; 3) Time Division Multiple Access (TDMA) Medium Access Control (MAC) with automatic discovery; and 4) an abstract acoustic modem driver. Building on this networking framework, two approaches that use the vehicle's "intelligence" to …
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Guaranteeing Communication Quality in Real World WSN Deployments
… of the widely used approaches to coordinate access to the communication medium. This thesis also argues that the currently employed solutions at the MAC layer are insufficient to provide guarantees to the resource user. Therefore, we introduce Reins-MAC, a Time-Division Multiple-Access (TDMA) …
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Wireless ATM Networks Medium Access Control with Adaptive Parallel Multiple Substream CDMA Air-inteface
… components of any wireless network is the medium access control protocol. This research deals with wireless ATM (WATM) medium access control (MAC) protocol. Conventional studies concerning WATM have focused mainly on variations of the time-division-multiple-access (TDMA) method for the wireless …
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Scheduling with privacy constraints
… where a common processor is shared among multiple users, one also has to consider the associated privacy which is a measure of the information about the usage pattern of one user of the system that can be learned by another as a consequence of sharing the scheduler. Consider two processes, …
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Radio Resource Management in 5G Cellular Networks
… and the sub-6GHz transmissions, different access techniques, like Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA) and the novel Sparse Code Multiple Access (SCMA), the support of advanced radio access technologies, such as beamforming technique …
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Simulation of an Anti-Collision Algorithm for RFID Systems using a Code Division Multiple Access with Adaptive Interference Cancellation (CDMA/AIC) Approach with Dynamic Processing Gain (Gp)
… is limited by collision problems when multiple tags transmit simultaneously. Due to the collision problem, much research has been developed using anti-collision algorithms to enhance the systems' efficiency, save energy, and ensure the correct transmission of information. Most research …
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Energy harvesting-aware design of wireless networks
… systems is mainly concerned with the battery lifetime, a key advantage of EH is that it enables potential perpetual operation of the devices, without requiring maintenance for battery substitutions. However, the inherent unpredictability regarding the amount of energy that can be collected from …
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Development of Methodology for Achieving Reliable GPS Performance In 3G Handset Noisy Environments
… Global System for Mobile (GSM) and Wideband Code Division Multiple Access (WCDMA), where the transmit (TX) section of the latter can interfere with the performance of the GPS due to TX band noise injected into the GPS band. For the case of WCDMA, the problem is out-of-band interference due to its …
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Fixed chain-based wireless sensor network for intelligent transportation systems
… propagation, energy constraints and the Media Access Control (MAC) protocol. This thesis develops a ground level radio propagation model for communication between road studs, and energy efficiency metrics to manage the resources to overcome the energy constraints, as well as a MAC protocol …
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