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 20 of 59 for “"RF front-end"”.
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Cognitive RF Front-end Control
This research addresses the performance degradation in receivers due to poor selectivity. Poor selectivity is expected to be a primary limitation on the performance of Dynamic-Spectrum-Access (DSA) and millimeter wave (mmWave) technologies. Both DSA and mmWave are highly desired technologies …
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Superconducting RF front-end filters for cell phone base stations
… filters are therefore ideal in the function of front-end filters on cell phone base stations, serving to reject any unnecessary signals, eliminating intermodulation distortion (IMD). Broader geographical coverage and higher calling capacity per tower are other effects of the superconducting …
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Wideband RF Front End Daughterboard Based on the Motorola RFIC
… We still need to convert high-radio frequency (RF) signals that we receive to low intermediate-frequency (IF) or baseband (centered on zero Hz) signals in order for ADCs to sample them and feed them into microchips for processing. The reverse is true when we transmit. Amplification is also …
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Reconfigurable RF front end: A mixer-first architecture and tunable filters
Two ways of achieving a reconfigurable RF receiver system, namely a mixer-first receiver system and an on-chip tunable bandpass filter, are reviewed and verified. For the mixer-first receiver, a pure passive mixer called distributedly modulated capacitor (DMC) is introduced and analyzed, then …
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A Raw processor interface to an 802.11b/g RF front end
… was designed in part to be extremely good at performing streaming-type algorithms such as those found in wireless communications processing. This thesis describes the design and implementation of an interface between the Raw microprocessor and a modified 802.11a/b/g wireless access point. …
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Low-Power RF Front-End Design for Wireless Body Area Networks
Wireless body area networks (WBANs) have tremendous potential to benefit from wireless communication technology and are expected to make sweeping changes in the future human health care and medical fields. While the prospects for WBAN products are high, meeting required device performance with a …
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Power-Efficient Voltage-Mode RF Front-End Using Quantized Analog Signal Processing
… real-estate and reducing overall cost for modern RF front-ends, SAW (Surface Acoustic Wave)-less RF receivers have become a popular topic recently. Unfortunately, removal of SAW filters requires the receiver to handle large blockers (e.g., above 0 dBm) without degrading the noise floor and in turn …
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Design and Implementation of an RF front end for the NeXtRAD radar system
This dissertation presents the design of the RF front end for use on the NeXtRAD radar system. The system is intended for research purposes to investigate potential target detection benefits to be derived from a multistatic, dual-band (X- and L-band), polarimetric radar architecture, particularly …
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Unilateral and multi-functional RF front-end filtering networks using spatiotemporally modulated resonators arrays
… impose stringent demands on radio-frequency front-ends (RFFEs) requiring compact, reconfigurable, and multi-functional RF components that can reduce size, weight, power, and cost (SWaP-C) of the RFFE while maintaining high spectral efficiency and adaptability to a wide range of frequency …
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A High Temperature RF Front-End of a Transceiver for High Speed Downhole Communications
… cooling systems or tolerating degraded performance. Recently, there has been a demand for more robust electronics that can operate at higher temperature without sacrificing the performance or the use of any weighty, power hungry, complex cooling systems. One of the major industries that …
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RF- Front-End Non-Linear coupling cancellation = Cancelación de acoplo no lineal en frontales de RF
Abstract In order to extend the communication range, improve reliability and achieve higher bit rates recent trends in communication industry include the use of multiple antennas in transmitter and at the receiver. At the same time the dimensions of mobile terminals are getting smaller incrementing …
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A dual-mode Q-enhanced RF front-end filter for 5 GHz WLAN and UWB with NB interference rejection
… the two spectrums, the stronger 802.11a signals tend to interfere causing degradation to the UWB receiver. This presents one of the main technical challenges preventing the wide acceptance of UWB. The research work presented in this thesis is to propose a low cost RF receiver front-end filter …
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Analysis of RF Front-End Non-linearity on Symbol Error Rate in the Presence of M-PSK Blocking Signals
Radio frequency (RF) receivers are inherently non-linear due to non-linear components contained within the RF front-end such as the low noise amplifier (LNA) and mixer. When receivers operate in the non-linear region, this will affect the system performance due to intermodulation products, and …
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RF Front End for an Integrated Silhouette Capture and Boundary Detection Frequency Modulated Continuous Wave Ultra-Wideband Radar System for the Extension of Independent Living
… and data transmission. This paper develops the RF front end hardware for the silhouette capture subsystem.</p> <p>System requirements are derived for the silhouette capture subsystem. An architecture for the RF front end is designed, and required individual component specifications are …
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Design and development of a frequency hopper based on the DECT system for the 902-928 MHz ISM band
… (DECT) standard defines a high-performance digital communications system for two-way transfer of speech and data information. This thesis is concerned with the development of a frequency hopping Spread spectrum transceiver based on the DECT radio frequency (RF) front end, and fully …
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An adaptive Orthogonaly Division Multiplexing baseband modem for wideband wireless communication
… The baseband modem is then integrated with a RF Front End. The maximum transmit power of the RF Front End is 7.5 dBm. This prototype takes 128 MHz of bandwidth and divides it into 128 1-MHz bins. The carrier frequency is at 5.25 GHz. Measurements are taken with this prototype to investigate …
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Implementation of Real-Time Software Receiver for Gps or Glonass L1 Signals
… developed here makes use of a reconfigurable RF front end called the Universal Software Radio Peripheral (USRP) with a maximum real sampling frequency of 8MHz of complex samples. The USRP uses interchangeable daughter boards to down-convert and digitize RF signals in the range of DC to 2.9GHz, …
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Design and implementation of L and X-band filters for the NeXtRAD front end
Microwave filters are required at the RF front end of a research radar called NeXtRAD to suppress out of band transmitted and received signals. NeXtRAD is a multistatic pulse-Doppler radar system, developed at the University of Cape Town (UCT) in collaboration with the University College London …
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