Opportunistic Spectrum Access for Mobile Users of Cognitive Wireless Networks
Primary Faculty Mentor’s Name
Dr. Danda Rawat
Proposal Track
Student
Session Format
Poster
Abstract
Many of the devices we use every day rely on multiple wireless communication standards. For example, a typical smart phone communicates with: cell towers using GSM, CDMA, or LTE; Wi-Fi base stations in the 2.4 and 5 GHz ranges; Bluetooth headsets or vehicle stereos; GPS satellites; and NFC payment systems. One element all of these features have in common is that they require Radio Frequency (RF) channels—a portion of the electromagnetic spectrum as described by frequency or wavelength—to operate. Since there is a direct relationship between the bandwidth of a channel and the speed of information transmitted using a given protocol, RF spectrum has become a major limiting factor in wireless communications. The FCC was created, in part, to regulate the spectrum in order to reduce the number of collisions that occur when multiple nearby transmitters use the same frequency without cooperating. This has worked well for many years, but as an increasing number of devices are manufactured that use wireless communication, the amount of unassigned usable spectrum is diminishing or, for some application requiring long wavelength, depleted.
Cognitive Radio (CR) with Opportunistic Spectrum Access (OSA) is a proposed solution to this RF spectrum crisis. CR technology uses sensors to scan large portions of the RF spectrum in a given location, determine what frequencies are idle, and allow secondary users access to those vacant frequencies without significantly interfering with primary users who have exclusive license from the FCC to operate in that portion of the spectrum. When spectral interweaving—transmitting for a short period of time on unused slices of the spectrum—is the method used to prevent packet collisions this is known as Opportunistic Spectrum Access. Despite the way most commercial wireless communication devices are used, much of the existing research into OSA assumes that user mobility is negligible. In this presentation we evaluate the impact of user mobility on OSA based communications using the CR testbed developed by the CWiNs lab at Georgia Southern University. This project is funded by the US National Science Foundation grant CNS 1405670.
Keywords
Opportunistic Spectrum Access, Cognitive Radio, Wireless Communications, Mobility, Dynamic Spectrum Access
Location
Concourse and Atrium
Presentation Year
2015
Start Date
11-7-2015 10:10 AM
End Date
11-7-2015 11:20 AM
Publication Type and Release Option
Presentation (Open Access)
Recommended Citation
source:http://digitalcommons.georgiasouthern.edu/gurc/2015/2015/49/
Opportunistic Spectrum Access for Mobile Users of Cognitive Wireless Networks
Concourse and Atrium
Many of the devices we use every day rely on multiple wireless communication standards. For example, a typical smart phone communicates with: cell towers using GSM, CDMA, or LTE; Wi-Fi base stations in the 2.4 and 5 GHz ranges; Bluetooth headsets or vehicle stereos; GPS satellites; and NFC payment systems. One element all of these features have in common is that they require Radio Frequency (RF) channels—a portion of the electromagnetic spectrum as described by frequency or wavelength—to operate. Since there is a direct relationship between the bandwidth of a channel and the speed of information transmitted using a given protocol, RF spectrum has become a major limiting factor in wireless communications. The FCC was created, in part, to regulate the spectrum in order to reduce the number of collisions that occur when multiple nearby transmitters use the same frequency without cooperating. This has worked well for many years, but as an increasing number of devices are manufactured that use wireless communication, the amount of unassigned usable spectrum is diminishing or, for some application requiring long wavelength, depleted.
Cognitive Radio (CR) with Opportunistic Spectrum Access (OSA) is a proposed solution to this RF spectrum crisis. CR technology uses sensors to scan large portions of the RF spectrum in a given location, determine what frequencies are idle, and allow secondary users access to those vacant frequencies without significantly interfering with primary users who have exclusive license from the FCC to operate in that portion of the spectrum. When spectral interweaving—transmitting for a short period of time on unused slices of the spectrum—is the method used to prevent packet collisions this is known as Opportunistic Spectrum Access. Despite the way most commercial wireless communication devices are used, much of the existing research into OSA assumes that user mobility is negligible. In this presentation we evaluate the impact of user mobility on OSA based communications using the CR testbed developed by the CWiNs lab at Georgia Southern University. This project is funded by the US National Science Foundation grant CNS 1405670.
