Wireless Cloud Architecture Based on Thin Clients and Ontologies

Recently, several researchers have discovered the need for radios to use description techniques for the objects in the wireless realm. The concept of RF field-programmable analog array (FPAA) was also proposed recently and the lack of hardware abstractions was identified as a problem. We propose a hardware abstraction for RF FPAAs, which enables an open RF-digital interface. We advance the concept of wireless thin clients. These clients are connected to the cloud using the open RF-digital interface. We describe the architecture of a comprehensive wireless ontology

THROUGHPUT AND LATENCY PERFORMANCE OF IEEE 802.11E WITH 802.11A, 802.11B, AND 802.11G PHYSICAL LAYERS

International Telemetering Conference Proceedings / October 18-21, 2004 / Town & Country Resort, San Diego, CaliforniaIEEE 802.11e is an amendment of the medium-access control (MAC) layer of the standard for wireless local area networking IEEE 802.11. The goal of 802.11e is to provide 802.11 networks with Quality of Service (QoS). 802.11 has three physical layers (PHY) of practical importance: 802.11b, 802.11a, and 802.11g. 802.11a and 802.11g provide data rates between 6 and 54 Mbps, and 802.11b provides data rates of 5.5 Mbps and 11 Mbps. However these data rates are not the actual throughput. The actual throughput that a user will experience will be lower. The throughput depends on both the PHY and MAC layers. It is important to estimate what exactly is the throughput when the physical layer is 802.11a, 802.11b, or 802.11g, and the MAC layer is 802.11e. In other words, how does providing QoS change the throughput for each of the three physical layers? In this paper we provide answers to this problem. Analytic formulae are derived. The maximum achievable throughput and minimum delay involved in data transfers are determined. The obtained results have further significance for the design of high-throughput wireless protocols.International Foundation for TelemeteringProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection

Hands-On Open Access Broadband Wireless Technology Lab Mapping Course Outcomes to Lab Experiments

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, and analyze data, as well as to interact. The proposed labs can be used even in online courses. This paper describes the experiments proposed, the procedures and typical results. The experiments are tied to course objective

Improved low-complexity zero-padded OFDM receivers

The recently suggested Generalized Prefix–Orthogonal Frequency Division Multiplexing (GP–OFDM) uses an optimal non-zero guard interval (GI). A GI consisting of all zeros is also known, and the technique is referred to as Zero Padding (ZP–OFDM). ZP–OFDM performs very well, but suffers from a complexity problem. This paper provides two improved and low-complexity receiver designs for ZP–OFDM, which make the convolutions between the transmitted signal and the channel skew-cyclic. The channel matrix becomes ϕ-circulant. Both designs require a one-dimensional optimization. The first new design requires the result of the optimization to be available at the transmitter. The second new design eliminates completely the feedback to the transmitter. Simulation results indicate that proposed ZP–OFDM receivers have significant performance advantages compared with existing ZP–OFDM receivers such as ZP–OFDM–OLA and ZP–OFDM–FAST. The performance advantages are maintained in the presence of channel estimation errors and error-correction coding

Improved low-complexity zero-padded OFDM receivers

The recently suggested Generalized Prefix-Orthogonal Frequency Division Multiplexing (GP-OFDM) uses an optimal non-zero guard interval (GI). A GI consisting of all zeros is also known, and the technique is referred to as Zero Padding (ZP-OFDM). ZP-OFDM performs very well, but suffers from a complexity problem. This paper provides two improved and low-complexity receiver designs for ZP-OFDM, which make the convolutions between the transmitted signal and the channel skew-cyclic. The channel matrix becomes phi-circulant. Both designs require a one-dimensional optimization. The first new design requires the result of the optimization to be available at the transmitter. The second new design eliminates completely the feedback to the transmitter. Simulation results indicate that proposed ZP-OFDM receivers have significant performance advantages compared with existing ZP-OFDM receivers such as ZP-OFDM-OLA and ZP-OFDM-FAST. The performance advantages are maintained in the presence of channel estimation errors and error-correction coding. (C) 2016 Elsevier Inc. All rights reserved