ieee 802.22-the first worldwide wireless standard based on congnitive radios

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【文件名】:06911@52RD_ieee 802.22-the first worldwide wireless standard based on congnitive radios.pdf
【格　式】:pdf
【大　小】:307K
【简　介】:ieee 802.22-the first worldwide wireless standard based on congnitive radios
【目　录】:Abstract – In November/2004, we witnessed the
formation of the first worldwide effort to define a
novel wireless air interface1 standard based on
Cognitive Radios (CRs): the IEEE 802.22 Working
Group (WG). The IEEE 802.22 WG is chartered with
the development of a CR-based Wireless Regional
Area Network (WRAN) Physical (PHY) and Medium
Access Control (MAC) layers for use by licenseexempt
devices in the spectrum that is currently
allocated to the Television (TV) service. Since 802.22
is required to reuse the fallow TV spectrum without
causing any harmful interference to incumbents (i.e.,
the TV receivers), cognitive radio techniques are of
primary importance in order to sense and measure
the spectrum and detect the presence/absence of
incumbent signals. On top of that, other advanced
techniques that facilitate coexistence such as dynamic
spectrum management and radio environment
characterization could be designed. In this paper, we
provide a detailed overview of the 802.22
architecture, its requirements, applications, and
coexistence considerations that not only form the
basis for the definition of this groundbreaking
wireless air interface standard, but that will also serve
as foundation for future research in the promising
area of CRs.