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University of Nebraska - Lincoln
Computer and Electronics Engineering: Dissertations, Theses, and Student Research
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A Comprehensive Analysis Of Lte Physical Layer, Fahimeh Rezaei
A Comprehensive Analysis Of Lte Physical Layer, Fahimeh Rezaei
Computer and Electronics Engineering: Dissertations, Theses, and Student Research
The 3rd Generation Partnership Project (3GPP) introduced Long Term Evolution (LTE) as the 3rd generation of mobile communication standards. LTE Release 8 describes a mobile communication standard which supports up to 300 Mbps of data transmission in downlink using the OFDM scheme as well as up to 75 Mbps throughput for uplink using the SC-FDMA modulation. In this thesis, an in-depth study of LTE performance based on Release 8 is conducted for uplink and downlink under different scenarios. The main objective of this study is to investigate a comprehensive analysis of physical layer throughput of LTE Release8 based on standard …
Cross-Layer Optimized Wireless Multimedia Networking, Dalei Wu
Cross-Layer Optimized Wireless Multimedia Networking, Dalei Wu
Computer and Electronics Engineering: Dissertations, Theses, and Student Research
Multimedia communications, especially real-time video communications, is expected to be the major application of the next-generation wireless networks. However, bringing delay-sensitive and loss-tolerant multimedia services based on the current wireless Internet is a very challenging task. In this dissertation, we address cross-layer optimized wireless multimedia networking from both theoretical and practical perspectives. In the first part of the dissertation, we propose cross-layer optimization frameworks for real-time video communications over wireless networks, where the expected received video quality is adopted as the objective function. With the user-centric objective function, we first study content-aware video communications in single-hop wireless networks by exploring …
Study Of Physical Layer Security In Wireless Communications, Mustafa Duruturk
Study Of Physical Layer Security In Wireless Communications, Mustafa Duruturk
Computer and Electronics Engineering: Dissertations, Theses, and Student Research
This thesis has investigated security in wireless communications at physical layer. Security is an important issue for wireless communications and poses many challenges. Most security schemes have been applied to the upper layers of communications networks. Since in a typical wireless communication, transmission of data is over the air, third party receiver(s) may have easy access to the transmitted data. This work discusses a new security technique at the physical layer for the MIMO (802.11n) transmitters. For this project, the wireless medium is secured by transmitting a noise signal that is only recoverable by the receiver. This report includes an …
Performance Of Self-Encoded Spread Spectrum Under Worst-Case Jamming, Casey L. Deyle
Performance Of Self-Encoded Spread Spectrum Under Worst-Case Jamming, Casey L. Deyle
Computer and Electronics Engineering: Dissertations, Theses, and Student Research
Performance of Self-Encoded Spread Spectrum Under Worst-Case Jamming Casey Deyle, M.S University of Nebraska 2009 Advisor: Lim Nguyen Spread Spectrum Communications uses m-sequences (sometimes referred to as Pseudo Noise or PN sequences) modulated with a data signal to create a transmission signal that takes up more bandwidth than the original information signal. Self-Encoded Spread Spectrum (SESS) uses spreading codes generated by the transmitted signal, eliminating the need to synchronize m-sequences between the transmitter and receiver, thus making the channel more secure. This paper will discuss the performance of SESS system in Additive White Gaussian Noise (AWGN) and Rayleigh fading channels, …