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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(More)
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(More)
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(More)
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(More)
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