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 15 of 15 for “"IEEE 802.11a"”.
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A comparison of timing methods in orthogonal frequency division multiplexing (OFDM) systems
… local area network (WLAN) standards, such as IEEE 802.11a, and wireless metropolitan area network (MAN) standards, such as IEEE 802.16a. OFDM is a very efficient communications scheme for wireless ADHOC networks. However, the wireless environment causes inter-symbol interference (ISI) and …
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Performance of orthogonal frequency division multiplexing in a high noise, low signal-to-noise ratio environment with co-channel interference
… for modeling outdoor environments and the IEEE 802.11a standard.
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Spread OFDM via carrier interferometry spreading codes: performance, throughput, and PAPR enhancement
… and 1980's. OFDM is now the protocol in the IEEE 802.11a and IEEE 802.1 lg Wireless Local Area Networks (WLANs) standards, as well as the IEEE 802.16 Fixed Broadband standard. It is also a front-runner for implementation in future cellular standards and satellite systems. However, OFDM is not …
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Addressing the challenges facing deep learning based Specific Emitter Identification via preamble based waveforms
… the multi-day classification performance of IEEE 802.11a OFDM emitters.
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Throughput Optimization and Transmitter Power Saving (TOTPS) Algorithm and Extended TOTPS (ETOTPS) Algorithm for IEEE 802.11 Links
The IEEE 802.11 wireless local area network (WLAN) standard supports multiple transmission modes. However, the higher mandatory data rate mode does not necessarily yield higher throughput. This research started from the relationship between the link throughput and the channel's carrier-to-noise …
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Rapid Prototyping of Software Defined Radios using Model Based Design for FPGAs
… achieve prototyping for wireless standards like IEEE 802.11a and IEEE 802.16e on reconfigurable hardware. It also describes the interfacing of the universal software radio peripheral (USRP2), acting as a radio frequency (RF) front end, with an additional FPGA board for baseband processing.
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Quadrature amplitude modulated codes with low peak-to-mean envelope power ratio for orthogonal frequency division multiplexing applications
… area network (LAN) standards HIPERLAN/2, and IEEE 802.11a. One problem inherent in plain vanilla OFDM is that its signal envelope fluctuates greatly with very high power peaks, necessitating the use of inefficient and complex linear power amplifiers. Solutions to the high peak-to-mean envelope …
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Exploiting Cyclostationarity for Radio Environmental Awareness in Cognitive Radios
… is demonstrated through the identification of IEEE 802.11a/g OFDM signals from different Wireless Local Area Network (WLAN) card manufactures using HMMs.
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OPTIMAL ANTENNA DESIGNS FOR WIRELESS COMMUNICATION APPLICATIONS
… characteristics in the entire band of WLAN IEEE 802.11a. A new ultra-wideband low profile microstrip antenna is presented for wireless applications. The proposed antenna has a compact size of 20x16 mm2 and an impedance bandwidth of 134.88% (3.5 GHz to 18 GHz). With the compact, …
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Coding in 802.11 WLANs
… systems to correct transmis- sion errors. In IEEE 802.11a/g transmitters, convolutional codes are used for FEC at the physical (PHY) layer. As is typical in wireless systems, only a limited choice of pre-speci¯ed coding rates is supported. These are implemented in hardware and thus di±cult to …
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Space Time Processing for Third Generation CDMA Systems
… as one of the modulation formats for the IEEE 802.11a wireless LAN standard. OFDM has emerged as one of the primary candidates for the Fourth Generation (4G) wireless communication systems and high speed ad hoc wireless networks. We propose a simple pilot symbol assisted frequency domain …
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Performance analysis of hybrid WiFi and TV white space links
… Experiments focused on the performance of WiFi (IEEE 802.11a) and TVWS (IEEE 802.11g cards downconverted to UHF) with an objective to help improve connectivity in areas with poor coverage, due to environmental factors, such as vegetation and distance. The study utilized the Council of Scientific …
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A 5-6 Ghz Silicon-Germanium Vco With Tunable Polyphase Outputs
In-phase and quadrature (I/Q) signal generation is often required in modern transceiver architectures, such as direct conversion or low-IF, either for vector modulation and demodulation, negative frequency recovery in direct conversion receivers, or image rejection. If imbalance between the I and Q …
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SiGe BiCMOS RF ICs and Components for High Speed Wireless Data Networks
The advent of high-fT silicon CMOS/BiCMOS technologies has led to a dramatic upsurge in the research and development of radio and microwave frequency integrated circuits (ICs) in silicon. The integration of silicon-germanium heterojunction bipolar transistors (SiGe HBTs) into established "digital" …
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Coexistence of Vehicular Communication Technologies and Wi-Fi in the 5 and 6 GHz bands
… dense vehicular settings. Since DSRC uses the IEEE 802.11p standard for its physical (PHY) and medium access control (MAC) layers, the manner in which DSRC and Wi-Fi devices try to gain access to the channel is fundamentally similar. Consequently, we show that spectrum sharing between these two …