And that is why America's telecoms regulator, the Federal Communications Commission (FCC), ruled in February 2002 that UWB devices could operate across a broad swathe of the radio spectrum, from 3.1GHz to 10.6GHz, without requiring spectrum licences.This unusual approach makes UWB very different from Wi-Fi and Bluetooth, two other unlicensed radio technologies.
The increasing use of wireless communications systems dedicated to vehicles will require spectrum availability for V2V communication system.
The proposed algorithms process and assign frequencies to the SUs requiring spectrum access in a sequence where in each iteration step the most difficult SU is selected.
The routing and mobility services can require spectrum for the selected paths and mobile devices to the dynamic spectrum management service and thus the joint of routing, mobility, and spectrum occurs.
Although this paper focuses on multiple cognitive radio networks for tactical communications, the proposed algorithm can be applied to any application requiring spectrum management between multiple cognitive radio networks for parallel multicast channels with only common information.
Each operator first calculates the minimum required spectrum size in terms of Hz or the number of subcarriers, calculated based on its users' data rate requirements and transmitting power budget.
Further, we classify different risk regions for miss detecting the PU based on the temporal characteristics of the PU transmission, and consequently derive the minimum required spectrum sensing time to reliably detect the PU with a given confidence level.
And all that traffic, all those bits and bytes and gigs, they all require spectrum to travel from points A to B, which is why wireless providers are currently on major shopping sprees.
For this purpose many chemical methods involving specific colour reactions have been developed, requiring spectrum-analyzing instruments (spectrophotometers) for quantitative measurement.
