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The SUs can achieve their communication in the time incentive without the need for spectrum sensing.
To alleviate the need for spectrum and make better use of the given resources, opportunistic spectrum access (OSA) [1] has emerged as a sub-field of cognitive radio.
Based on the need for spectrum, these technical enablers shall help to obtain spectrum by negotiating access to it with other entities and also assessing the use of spectrum.
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The Defense Department has said it supports the president's goals of freeing up spectrum, but noted that an increasingly electronically armed military had its own rising needs for spectrum.
It is based on the digital signal processor, sampling ADC and contains other components needed for spectra processing (i.e. RAM, Flash/ROM, real time clock, power supply block).
Verizon officials said that they had no immediate need for additional spectrum, because of the deal with Northcoast, a unit of Cablevision Systems.
That a new technology could become so popular so quickly demonstrates the need for additional spectrum, Mr. Genachowski says, because those technologies can spur new ways to address "major national challenges like education, health care, energy, transportation and public safety".
At the CTIA Wireless conference in New Orleans on Tuesday, the president of the wireless trade group CTIA couldn't stop talking about his industry's need for more spectrum, the government-rationed radio waves that carry voice calls and wireless data.
But the chronic problems of getting through wirelessly demonstrated the need for more spectrum capacity on urban cellular networks -- something the carriers have been trying to obtain through a federal auction process that has hit numerous snags in Washington, leaving the United States behind Europe and Japan in telecom mobility.
It is one of the most fiercely competitive industries in the world, with a mounting need for more spectrum that has not diminished and must be addressed immediately.
This property makes PHY-SI a prominent approach to satisfy the ever-increasing need for radio spectrum.
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