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Beam forming is being used in sensor networks to enhance it communication range. Dual beam can be formed from two sets of sensors array wherein each set forming beam pattern in different direction. When same data need to be transmitted to two different directions, one set of sensors array can be used to form dual beam. The random distribution of sensors causes the beam pattern deviation. The random...
Beamforming is being used in sensor networks to enhance its communication range.The sensors in networks use their own clock adjustment for distributed beamforming by coordinating with other sensors. For this, the Channel State Information(CSI) is required. Since the CSI is not available at the transmitter side, the Channel Phase tracking is used. A novel bisection based phase tracking method is proposed...
A novel video encryption scheme based on chaotic maps is performed. First the video sequence to be encrypted is taken. Then it is split up into frames. If the frames are larger in size, then it is broken into macro-blocks for the operation. The high dimensional Lorenz chaotic system is employed to confuse the position of the pixels. Multi-key concept is used to improve the security of the cryptosystem...
Wireless ad hoc networks consist of nodes which can communicate with each other in a peer-to-peer fashion over single hop or multi hops without any fixed infrastructure such as access point or base station. In flat topology there is no topology management concept and all the nodes participate in routing. In this paper the task of topology management for ad hoc networks is implemented using routing...
Facial expression recognition has attracted a significant interest in the scientific community, as it plays a vital role in human centered interfaces. Many applications require efficient facial expression recognition in order to achieve desired results. In this paper facial expression recognition is presented using self organizing map(SOM). At first placement of Candide grid nodes to face landmarks...
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