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 160 for “"high data rate"”.
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High data rate acoustic communications with nonideal channels
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-12-01
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Space-Time Codes for High Data Rate Wireless Communications
Space-time codes (STC) are a class of signaling techniques, offering coding and diversity gains along with improved spectral efficiency. These codes exploit both the spatial and the temporal diversity of the wireless link by combining the design of the error correction code, modulation scheme and …
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Analysis Of Time Synchronization Errors In High Data Rate Ultrawideban
… systems hold the promise of delivering wireless data at high speeds, exceeding hundreds of megabits per second over typical distances of 10 meters or less. The purpose of this Thesis is to estimate the timing accuracies required with such systems in order to achieve Bit Error Rates (BER) of the …
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Delta-Sigma digital-RF modulation for high data rate transmitters
… presented. The transmitter architecture replaces high dynamic range analog circuits with high speed digital circuits and a passive LC bandpass filter, saving power and area compared to conventional IQ modulators for wideband systems. A prototype transmitter IC built in 0.13 pm CMOS demonstrates a …
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High Data Rate Coherent Optical OFDM System for Long-Haul Transmission
… driven the increase in demand for bandwidth and high data rates. Optical Orthogonal Frequency Division Multiplexing is considered as a promising technology to satisfy the increased demand for bandwidth in broadband services. Optical OFDM received a great attention after proposing it as a …
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A Proposed Architecture for a High-Data Rate Mobile Lmds Network
This thesis proposes a system architecture for a high-data rate mobile Local Multipoint Distribution Service (LMDS) Network. Its goal is to provide a workable "strawman" design that can serve as a basis for further research. The architecture is designed to offer broadband services to train …
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Effects of user and spatial diversity on high data rate wireless systems
A novel design paradigm for wireless data delivery involves use of a scheduler at a base station to schedule users awaiting transmission and send downlink data to these users with all available cell power. This is unlike previous systems that share the available downlink power between users and …
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An implementation of a 5.25 GHz transceiver for high data rate wireless applications
The desire for transmission of high data rate information across wireless channels has grown immensely over the past decade. Wireless devices available today including mobile phones, wireless local area networks (WLANs) and Bluetooth radios have realized a wide variety of applications at data rates …
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Multiple-input multiple-output visible light communication receivers for high data-rate mobile applications
… of optical wireless communication that transmits data by modulating light in the visible spectrum. To meet the growing demand for wireless communication capacity from mobile devices, we investigate multiple-input multiple-output (MIMO) VLC to achieve multiplexing capacity gains and to allow …
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Techniques for high data rate modulation and low power operation of fractional-N frequency synthesizers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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An analysis of a broadband multicarrier CDMA cellular communications system
… environment will require fading resistant, high data rate, non-exploitable communications. The large volumes of video and data information, i.e. Internet access, video teleconferencing and data transfer, required to support the war fighter within a Joint Task Force demands technologies that …
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THz Cryo-CMOS Link for Quantum Computing
… can efficiently deliver the control signals and data between room temperature and cryogenic environment. Its operation allows for a small antenna aperture size, high data rate, and minimal interference with the operation of the qubits.
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Harvesting time-frequency-space diversity with coded modulation for underwater acoustic communications
… of this thesis is to design a low-complexity, high data-rate acoustic communications system with robust performance under various channel conditions. The need for robust performance emerges because underwater acoustic (UWA) channels have time-varying statistics, thus a coded modulation scheme …
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A Study of a Versatile Low Power CMOS Pulse Generator for Ultra Wideband Radios
… offering the possibility to provide extremely high data rate wireless solutions. In addition to high data rate applications, UWB technologies also offer an extremely low cost alternative for many low data rate systems. In this thesis, we describe the design of a CMOS pulse generator for impulse …
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The application of SOA for dispersion management of 2D-WH/TS codesin incoherent OCDMA system
In high data rate optical fibre communication networks, dispersion phenomenon plays a pivotal role. It is important to investigate the dispersion effects in a multi-wavelength picosecond optical code division multiple access (OCDMA) system. This research is focused on the analysis of the effects of …
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The Bit Error Rate (BER) Performance in Multi-Carrier (OFDM) and Single-Carrier
… several issues with how service is provided. The high user demand has forced developers to overcome the problems of the old analog systems and to introduce OFDM as a promising technique that can fulfill users' high demands. This technique matches well with high data rate connection and provides a …
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Performance analysis for near-field atmospheric optical communications
Establishing, high data rate communication links over short distances via fiber-optic cables may prove costly and time consuming, particularly in urban areas. Through-the-air optical communication systems are a reliable and cost effective alternative for establishing high data rate links when the …
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Equalizers for communications satellites
… at MIT Lincoln Laboratory. Equalizers facilitate high data rate communication by correcting dispersion in the transmitter and receiver signal chains. An automated calibration procedure for finding optimal equalizers was developed. Repeated testing addressed questions about noise amplification, …
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A Study of Wireless Modem Performance Using Multiple Element Antennas
… hardware platforms, following the demand for high data rate. In correlated channels Channel State Information (CSI) at the transmitter provides a significant capacity increase over conventional Multiple Input Multiple Output (MIMO) systems. In such a case, the Singular Value Decomposition …
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On-Chip Voltage Controlled Oscillator for Clock Data Recovery Systems
As the clock rates of microprocessors keep increasing, high data rate input/output (IO) should be designed to realize their maximum benefit. However, designing robust, low power, high speed IO links is very challenging due to the increased transmission line loss, cross talk, and signal distortion …
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