Energy Detection Technique for Spectrum Sensing in Cognitive Radio: A Survey

Abstract

ABSTRACT

A Modified TV Tuner for Spectrum Sensing in TV UHF Bands

“…IF one or more of PUs back to reuse his band (White or Gray space), the CR moves to another available spectrum hole as shown in Figure 1 [4], and that's why Cognitive Radio considered as intelligent adaptable wireless communication system used to achieve the mission of spectrum utilization regarding causing interference between licensed users and unlicensed (portable) users, by using one or more of the spectrum sensing techniques which is discussed in next section.…”

“…A temporal spectrum hole is unoccupied band by the PU during the sensing time. Hence, the SUs can occupy this band in the current time slot [3,4].…”

“…However, there are restrictions on which channels are permissible for use by TVBDs. Channels (3)(4) in the VHF channels and channels (36-38) in the UHF channels are not permitted for fixed devices. Fixed devices are forbidden to use channel (3)(4) to prevent interference with external devices (e.g.…”

Optimization in Cooperative Spectrum Sensing Techniques of CRN

“…The binary hypothesis is represented as: H 0 : primary user is absent; H 1 :primary user is present This hypothesis consider the spectrum sensing in the i th CR .the sensing model is to decide between the following two hypothesis [6] ,…”

“…There are two important metrics in spectrum sensing:(1) detection probability and (2) false alarm probability [6] . The higher the , the better the PUs are protected; the lower the , the more efficiently the channel can be reutilized by SUs.…”