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Full-Text Articles in Engineering
Hands-On Open Access Broadband Wireless Technology Lab, Todor Cooklev, Y. Alqudah
Hands-On Open Access Broadband Wireless Technology Lab, Todor Cooklev, Y. Alqudah
Todor Cooklev
The unprecedented growth in wireless communication is offering opportunities and challenges for educators. Thanks to technology advances and job opportunities, more and more students are interested in wireless communications courses. However, bridging the gap between classroom and real-world experience remains a challenge. Advanced undergraduate communications courses typically focus more on theory. Some courses are given online, and lack hands-on experiments. Driven by feedback from industry and students, we propose practical laboratory experiments that attempt to bridge the gap between classroom and real world. The laboratory exercises take advantage of the infrastructure of deployed wireless networks and allow students to measure, …
Generalized Prefix For Ofdm Wireless Systems Over Quasi-Static Channels, Todor Cooklev, H. Dogan, R. Cintra, H. Yildiz
Generalized Prefix For Ofdm Wireless Systems Over Quasi-Static Channels, Todor Cooklev, H. Dogan, R. Cintra, H. Yildiz
Todor Cooklev
All practical orthogonal frequency-division multiplexing (OFDM) systems require a prefix to eliminate intersymbol interference (ISI) at the receiver. Cyclic prefix (CP) and zero padding are well-known prefix construction methods, with the former being the most employed technique in practice due to its lower complexity. In this paper, we construct an OFDM system with a generalized CP. It is shown that the proposed generalized prefix effectively makes the channel experienced by the packet different from the actual channel. Using an optimization procedure, lower bit error rates (BERs) can be achieved, outperforming other prefix construction techniques. At the same time, the complexity …
An Improved Prefix For Ofdm-Based Cognitive Radios, Todor Cooklev
An Improved Prefix For Ofdm-Based Cognitive Radios, Todor Cooklev
Todor Cooklev
In OFDM-based cognitive radios several carriers are left unused to enable coexistence with other wireless systems. Proposed is a prefix design technique that depends on the wireless channel and on the set of unused carriers. It is shown that in this way considerable performance improvement can be obtained.
Engineering Standards And Engineering Education, Todor Cooklev
Engineering Standards And Engineering Education, Todor Cooklev
Todor Cooklev
The role of standards is increasing, and as a result the role of education about standards should also increase. At the same time, there are a set of requirements—accreditation criteria—toward engineering programs. The close relationships between the accreditation criteria and standards education is not fully recognized, even by accreditation bodies and educators. The goal of this article is to uncover these relationships. Furthermore, the article establishes connections between other components of engineering education such as ethics, engineering design, labs, and integrated courses, on one hand and standards education on another. The conclusion from these relationships is that standards education is …
Uwb-Fsk: Performance Tradeoffs For High And Low Complexity Receivers, F. Ramirez-Mireles, Todor Cooklev, G. Paredes-Orozco
Uwb-Fsk: Performance Tradeoffs For High And Low Complexity Receivers, F. Ramirez-Mireles, Todor Cooklev, G. Paredes-Orozco
Todor Cooklev
In this work we explore flexible modulations to allow demodulation using receivers with different complexity and cost. More specifically, we study pulse-based ultra wideband (UWB) communications over channels with dense multipath effects using frequency shift keying (FSK) data modulation. Our aim is to explore the performance tradeoffs between high and low complexity receivers. For this purpose we determine the performance of coherent, non-coherent and mismatched (e.g., non-coherent detection using templates consisting of a single path) demodulators. We take into account the influence of the frequency response of the antenna system and the effects of the frequency selectivity of the multipath …
The Vita 49 Analog-Rf Digital Interface, Todor Cooklev, R. Normoyle, D. Clendenen
The Vita 49 Analog-Rf Digital Interface, Todor Cooklev, R. Normoyle, D. Clendenen
Todor Cooklev
Over the last several years, the interface between the digital and analog RF subsystems of a radio (the analog RF-digital interface) has become increasingly important. this article first discusses the different technology alternatives that exist for this interface and the rationale behind them. the emergence of cognitive radio technology is identified as a trend that increases the importance of the analog RF-digital interface. then the article discusses in detail the VmE bus International trade association (VIta) 49 standard. VIta 49 is a packet-based protocol to convey digitized signal data and metadata (or context data) pertaining to different reference points within …