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 77 for “"TDMA"”.
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Spatial reuse in TDMA wireless networks
In this thesis we investigate the performance of spatial reuse in wireless networks. More specifically, we investigate the performance of location-based spatial reuse built upon the identification of links in the network that form Collision-Free Sets (CFSs). We develop algorithms that efficiently …
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TDMA Slot Reservation in Cluster-Based VANETs
… <p>1. A multi-channel cluster-based TDMA MAC protocol to coordinate intracluster communications (TC-MAC)</p> <p>2. A CH election and cluster formation algorithm based on the traffic flow and a cluster maintenance algorithm that benefits from our cluster formation algorithm</p> <p>3. A …
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Ss/tdma Time Slot Assignment With Generalized Switching Modes
… time division multiple access (SS/TDMA) method are studied. Given an m x n real matrix T, and a set of (0, 1)-matrices {Z(,1), Z(,2), (.)(.)(.) , Z(,(nu))}, the optimization problem we wish to solve is to find non-negative real constants (gamma)(,1), (gamma)(,2), ... , …
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MAC layer resource allocation algorithms for OFDM/TDMA wireless networks
In wireless networks employing OFDMA/TDMA, orthogonal channels and timeslots are available resources that should be distributed between users fairly and in a collision-free manner. Furthermore, the available resources should be used efficiently. In this dissertation, the resource allocation …
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Fast Chirped Signals for a TDMA Ultrasonic Indoor Positioning System
… 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 signals are used to form …
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Modeling and Analysis of Synchronization Schemes for the TDMA Based Satellite Communication System
… access technique, time division multiple access (TDMA) is becoming more widespread in satellite communications. Although single-carrier (SC) modulation techniques has been mostly employed in the TDMA satellite communication system, multi-carrier modulation techniques, like orthogonal frequency …
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Performance of adaptive admission\congestion control policies on a hybrid MC-CDMA\TDMA integrated multimedia networks
… In this work, a new hybrid Multicode (MC)-CDMA/TDMA medium access control technique utilizing multi-user detection accompanied with a traffic flow control scheme is proposed and analyzed. Secondly, the End-to-End performance criteria of the proposed MAC such as packet delay, channel utilization, …
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Slow frequency and time hopping in wireless communication
… achievable diversity in the scheme called SFH/TDMA (Slow Frequency Hopping/Time Division Multiple Access). Comparing the performance of SFH/TDMA with that of CDMA (Code Division Multiple Access) is a problem of both practical and theoretical interest. We contribute to the understanding of the …
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Protocol stacks for power-aware wireless microsensor networks
… broaderview knowledge of the environment. TDMA has been chosen as a MAC Layer protocol for its inherited power-aware mechanism of radio shutdowns outside its TDMA slot and in absence of sensing events. Another level of power-aware features can be deployed in MAC ID and TDMA slot …
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MAC and physical layer energy efficiency for ad hoc wireless sensor networks
… Non-contention based MAC protocols introduced TDMA I CDMA I FDMA that did not suffer from those problematic issues. However, they suffered from other problems, such as energy inefficient hierarchies. The hierarchy uses cluster-heads to co-ordinate neighbours which is a continual requires that …
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Wireless ATM Networks Medium Access Control with Adaptive Parallel Multiple Substream CDMA Air-inteface
… variations of the time-division-multiple-access (TDMA) method for the wireless aspect of WATM networks. However, there are many advantages that the direct-sequence code-division-multiple-access (DS-CDMA) air-interface method has, such as inherent robustness against multipath fading, better …
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Data Chunking in Quasi-synchronous DS-CDMA
… premise is derived by making a link between TDMA and synchronous DS-CDMA. By considering some basic TDMA limitations, a proposed “data chunked” quasi-synchronous DS-CDMA system is derived from a TDMA system. The effects of such a system are compared to those of a chip interleaved system. …
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Low computational complexity bit error rate simulation for personal communications systems in multipath and fading environments
… Access (CDMA) and Time Division Multiple Access (TDMA) are both multiple access techniques for wireless systems that can support significantly more users per cell than the present analog FDMA system. Both CDMA and TDMA use digital modulation, and so performance is compared based on bit and packet …
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Design of a medium access control protocol that exploits the structures of vehicular networks
… exploited to design a protocol based on dynamic TDMA that is well suited for VANETs. We present the Dynamic Channel Partition and Reservation (DCPR) Protocol, which is a specific VANET MAC protocol designed for operating a dynamic TDMA mechanism in a way robust to vehicular mobility, by …
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Simulation Study of Local Multipoint Distribution Service
… under study are Time Division Multiple Access (TDMA), and Frequency Division Multiple Access (FDMA). The duplexing schemes under study are Time Division Duplexing (TDD), and Frequency Division Duplexing (FDD). For the system under study, it was observed that TDMA results in lower end-to-end …
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Scheduling with privacy constraints
… policy and time-division-multiple-access (TDMA) are identified as two extreme policies on the privacy metric, FCFS has the least, and TDMA has the highest. However, on performance based metrics, such as throughput and delay, it is well known that FCFS significantly outperforms TDMA. This …
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Performance Analysis of Wireless Networks with QoS Adaptations
… QoS to the end-user. We first look at a request TDMA/CDMA protocol for supporting wireless multimedia traffic, where CDMA is laid over TDMA. Then we look at a hybrid push-pull algorithm for wireless networks, and present a generalized performance analysis of the proposed protocol. Some of the QoS …
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Design of Media Access Control Schemes for Performance Enhancement of Future Generation Wireless Systems
… proposes a new Time Division Multiple Access (TDMA) based scheme for providing video, voice and data services (also known as the Triple-Play services) in a point-to-multipoint network. By dynamically allocating transmission slots, the proposed Television TDMA (TV-TDMA) scheme is shown to better …
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