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.
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Showing 1 to 10 of 10 for “"channel hopping"”.
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Randomised shuffle and applied misinformation: An enhanced model for contact-based smart-card serial data transfer
… multiplexing techniques, known as frequency or channel-hopping, serve to increase the task complexity for and/or confuse potential eavesdroppers. The study seeks to ascertain the applicability and value of protection provided by channel-hopping techniques, when realised with minimal additional …
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Simulation and performance analysis of Cellular Digital Packet Data
… bursts of Reed-Solomon encoded information while channel hopping to avoid interfering with voice transmissions. This thesis assesses the performance of CDPD for different channel environments through simulation. Specifically, Gaussian noise, Rayleigh fading, co-channel interference models are …
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Error and erasure decoding for a CDPD system
… telephone network to transmit data with a channel hopping technique. The CDPD system employs Gaussian minimum shift keying (GMSK) as a modulation scheme and a Reed-Solomon code for error control to transmit high-quality data in the mobile and wireless environment. Most current CDPD …
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Enhancing Reliability, Throughput, and Energy Efficiency in UWB-based Applications
… entirely compatible with the UWB radio standard. Channel hopping for higher throughput may not be feasible in UWB networks that include nodes from different vendors. To reduce energy consumption, UWB applications have relied on low-power radios, such as Bluetooth Low Energy (BLE), for neighbor …
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Medium Access Control in Cognitive Radio Networks
… bands, and secondary users must vacate the channel where incumbent user signals are detected. A CR network is composed of secondary users equipped with CRs and it can coexist with incumbent users in licensed bands under the OSS paradigm. The coexistence between incumbent users and secondary …
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Wireless Sensor Networking in Challenging Environments
… protocols including the Adaptive and Robust Channel Hopping (ARCH) protocol and the Adaptive Energy Detection Protocol (AEDP). ARCH enhances network reliability through opportunistically changing radio's frequency to avoid interference and environmental noise and AEDP reduces false wakeups in …
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Pedestrian traffic monitoring using Wi-Fi technology
… the three aspects: hardware configuration, channel hopping methods, and pedestrian behaviours. Based on the results of tests and experiments, the optimized system configuration has been determined to ensure a good ability of packets capturing. Given the nature of outdoor environment …
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Adaptive and autonomous protocol for spectrum identification and coordination in ad hoc cognitive radio network
… to achieve interference free communication channel. In a CR system, Dynamic Spectrum Access (DSA) is made feasible. CR has been proposed as a candidate solution to the challenge of spectrum scarcity. CR works to solve this challenge by providing DSA to unlicensed (secondary) users. The …
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WIRELESS SENSOR NETWORKS FOR REAL-TIME APPLICATIONS IN INDUSTRY 4.0
… principalmente sulla modalità Time Slotted Channel Hopping (TSCH), definita nello standard IEEE 802.15.4-2015. TSCH è uno dei meccanismi di accesso al canale più diffuso e adatto alle IWSN. TSCH offre latenza dei pacchetti limitata, alta affidabilità, scalabilità e velocità di …
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Data Gathering in Cognitive Radio Ad Hoc and Sensor Wireless Networks
… secondary users (SUs) opportunistically use channels when the licensed primary users are not using them. Therefore, the channels available to each SU vary with time and location, which makes the development of data gathering algorithms for CR-AHSWNs challenging.</p> <p>In this thesis, a data …