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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
71

Design of AM antenna arrays on a small computer using interactive graphics

Leckie, Robert Bedford January 1975 (has links)
No description available.
72

Array processing techniques for interference suppression in mobile communications systems

Schodorf, Jeffrey Brian 05 1900 (has links)
No description available.
73

Angle of arrival estimation utilizing hybrid arrays

Brown, George C. 05 1900 (has links)
No description available.
74

Performance evaluation and enhancement of MIMO broadcast channels

Lu, Peng 25 May 2011 (has links)
In Multiple-Input Multiple-Output (MIMO) broadcast channels, the multi-antenna basestation transmits information to multiple non-cooperative mobile users simultaneously. Among various transmission schemes, zero-forcing beamforming (ZFBF) and random unitary beamforming (RUB) are of particular interest due to their low implementation complexity and ability to explore the multiplexing gain provided by multiple transmit antennas. To investigate the effects of multiuser diversity on sum-rate performance, previous studies of beamforming schemes in multiuser MIMO systems usually employ asymptotical analysis. In this work, while assuming channel gain follows Rayleigh flat fading, we study the sum-rate performance of ZFBF and RUB through exact mathematic analysis. For this purpose, we derive the statistics of selected users's effective channel gain, which enable us to calculate the sum rate accurately and efficiently. With derived sum-rate expressions, we evaluate and compare the sum-rate performance of MIMO broadcast channels with RUB and dual-transmit-antenna ZFBF. In addition, we apply this analytical method to study strategies that mitigate multiuser interference for RUB-based multiuser MIMO systems. The strategies we consider in the thesis include • Reducing the number of served users at a time. We present a new user scheduling scheme, which imposes a threshold On user's SINR for feedback load reduction and only activates those beams that are requested by feedback users. • Exploiting receive diversity. When receivers use more than one antennas, we evaluate the sum-rate performance gain offered by selection combining (SC) and optimum combining (OC) schemes, respectively. In addition to beamforming techniques, we study the symbol error rate (SER) performance of MIMO broadcast channels with vector perturbation (VP) precoding and quantized channel feedback. Based. on the established equivalent relations in terms of minimum mean square error (MMSE) and SER between quantized and perfect channel feedback cases, we investigate the tradeoff between feedback load and achievable diversity gain. / Graduate
75

Arrival directions of medium energy cosmic rays in the southern hemisphere /

Bird, David John, January 1991 (has links) (PDF)
Thesis (Ph. D.)--University of Adelaide, Dept. of Physics and Mathematical Physics, 1991. / Includes bibliographical references (leaves i-xx).
76

Weak signal reception using software defined radios and a two-element antenna array

Rundquist, Victor Frederic, January 2006 (has links) (PDF)
Thesis(M.S.)--Auburn University, 2006. / Abstract. Vita. Includes bibliographic references.
77

Blind adaptive antenna arrays for mobile communications /

Petrus, Paul, January 1994 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1994. / Vita. Abstract. Includes bibliographical references (leaves 121-126). Also available via the Internet.
78

Analysis of spatially distributed adaptive antenna array systems in cellular networks

Da Silveira, Marthinus Willem. January 2005 (has links)
Thesis (Ph.D.(Electrical Engineering)--University of Pretoria, 2004. / Summaries in Afrikaans and English. Includes bibliographical references.
79

A hardware architecture for real-time beamforming

Fuster, Joel J. January 2004 (has links)
Thesis (M.S.)--University of Florida, 2004. / Title from title page of source document. Document formatted into pages; contains 137 pages. Includes vita. Includes bibliographical references.
80

RF variable phase shifters for multiple smart antenna transceivers /

Zarei, Hossein. January 2004 (has links)
Thesis (Ph. D.)--University of Washington, 2004. / Vita. Includes bibliographical references (leaves 135-143).

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