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Performance of Cognitive Radio (CR) is affected by the estimation of availability of vacant channels based on traffic distribution observation of licensed users. Telecom traffic prediction at a particular instant depends on thorough knowledge of day of the week, hour of the day and instant of the hour. Distributed cooperative spectrum sensing is infrastructure based in which the sensor nodes themselves...
A microcontroller based monitoring and control system for a Variable Frequency Drive system (VFD) is developed which controls a material handling system (conveyor belt) using VFD and three-phase induction motor connected to it. The conveyor belt is used for linear movement of products in front of electron beam for irradiation. The position of product box (which is to be irradiated) is obtained with...
Mobile WiMAX based on OFDM technology has been implemented in several countries at 2600 MHz and 3500 MHz bands. OFDM technology promises high throughput based on availability of good signal strength and CINR which helps to achieve higher modulation coding gain. MIMO is an additional technology which enhances the throughput further. In the present study, an WiMAX installation was taken at a green field...
Basis of cognitive radio is to exploit unused frequency channels in licensed bands. Recently standardised IEEE 802.22 set of cognitive radio protocols envisages fixed and nomadic receivers at below 800 MHz bands. Existing mobile communication system uses CDMA in 800 MHz band and GSM in 900 MHz band. Research works has established that there are some vacant channels in these mobile communications bands...
Mobile WiMAX based on OFDM technology has been implemented in several countries at 2600MHz and 3500MHz bands. OFDM technology promises high throughput based on availability of good signal strength and CINR which helps to achieve higher modulation coding gain. In the present paper, anWiMAX installation at a green field area was studied. Spectral efficiency obtained established a definite relationship...
Basis of cognitive radio is to exploit unused frequency channels in licensed band. Recently standardized IEEE 802.22 set of cognitive radio protocols envisages fixed and nomadic receivers at below 800 MHz bands. Radio link design for this cognitive radio consider that the channels are available only dynamically to secondary users. Scanning period is thus embedded in link layer control as overhead...
Current wireless networks are characterized by a static spectrum allocation policy, where governmental agencies assign wireless spectrum to license holders on a long term basis for large geographical regions. Because of the increase in spectrum demand, this policy faces spectrum scarcity in particular spectrum bands. As a result, a significant amount of spectrum is underutilized. Hence, dynamic spectrum...
Basis of cognitive radio is to exploit unused frequency channels in licensed band. Recently standardised IEEE 802.22 set of cognitive radio protocols envisages fixed and nomadic receivers at below 800 MHz bands. Radio link design for this cognitive radio consider that the channels are available only dynamically to secondary users. Scanning period is thus embedded in link layer control as overhead...
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