The concept of cognitive radio has arisen as a generalization of the principle of multiple access in radio channels initially developed in the late sixties and early seventies including the pioneering methods of channel sharing depicted in the ALOHA and CSMA protocols. The intent is to go beyond the context of a single homogeneous system or network with a number of terminals that operate accord...

With the technological advancement in wireless applications more effective and efficient utilization of the available spectrum became the urgent requirement. According to the IEEE 802.22 standard the unlicensed secondary devices can operate in the licensed TV band, because this is the high underutilized licensed band, so long they do not interfere the licensed primary users. Therefore the secon...

This paper presents the design and proof-of-concept validation of a novel network-assisted spectrum coordination (NASCOR) service for improved radio coexistence in future shared spectrum bands. The basic idea is to create an overlay network service for dissemination of spectrum usage information between otherwise independent radio devices and systems, enabling them to implement decentralized sp...

Data from Princeton University’s New Immigrant Survey were analyzed to examine the associations between immigrants’ media use and 3 indicators of acculturation—current English proficiency, preference to use English in interactions, and American political knowledge. Findings show that pre-immigration uses of English language TV, radio, and print media and post-immigration use of English language...

The speed and accuracy of spectrum sensing techniques are essential factors in the performance of cognitive radio networks. The limitations imposed by computational complexity and a shortened monitoring time impede the success of spectrum sensing operation performed by cognitive radio nodes. Compressive sensing techniques are viewed as novel approaches to solve scalability problems in some sign...

Wireless communication is used in many different situations such as mobile telephony, radio and TV broadcasting, satellite communication, and military operations. For all these situations, a frequency assignment problem arises with application of specific characteristics. Different modelling ideas for every problem features, have been developed such as the handling of interference among radio s...

We have developed a set of college-level, table-top labs for teaching the basics of radio interferometry and aperture synthesis. These labs are performed with the Very Small Radio Telescope (VSRT), an interferometer using satellite TV electronics as detectors and compact fluorescent light bulbs as microwave signal sources. The hands-on experience provided by the VSRT in these labs allows studen...

With the rapid development in wireless devices, applications and networks, radio frequencies have become scarce resources. Therefore, it is critical to make efficient use of the radio frequencies. A promising way to solve this problem is the use of cognitive radio (CR). In CR, radio frequencies are allocated to licensed users, also called primary users (PUs) and these frequencies can be reused ...