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In this letter, the joint of Hadamard transform and Alamouti scheme is proposed. By applying Hadamard transform in the Alamouti scheme, two points of constellation can be merged into one symbol. This symbol is used for input of Alamouti scheme without changing the behavior of Alamouti scheme. System model for joint Hadamard transform and Alamouti scheme is also suggested and formulated. Simulation...
In this paper, the applied MIMO based on Hadamard transform in IEEE 802.16 WiMAX system is proposed. After modulation process, the two points of constellation are merged into one new symbol by Hadamard transform. The result of the addition of two constellations is transmitted through first antenna and the result of the reduction of two constellations is transmitted through second antenna. System model...
In this paper, we present an adaptive transmission power control in cluster-based routing to enhance performance of information dissemination in Vehicular Ad-hoc Networks (VANETs). In our scheme, transmission power is adapted based on the distance between vehicles and cluster head. The proposed algorithm also considers the uncertainty of vehicle mobility to achieve better performance in real situation...
Instead of using hexagonal model to form cellular coverage, the clustering method is used in this paper. This method is rarely considered but suitable for cellular network planning. We propose an idea by using clustering method considering geographical elements to obtain better solution called Geo-Clustering Algorithm. Usually the simulated terrain is modeled as regular area such as urban, metropolitan,...
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