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Quantum-dot cellular automata (QCA) is an attractive nanotechnology with the potential alterative to CMOS technology. QCA provides an interesting paradigm for faster speed, smaller size, and lower power consumption in comparison to transistor-based technology, in both communication and computation. This paper describes the design of a 4-bit multifunction nanosensor data processor (NSDP). The functions of NSDP contain (i) sending the preprocessed raw data to high-level processor, (ii) counting the number of the active majority gates, and (iii) generating the approximate sigmoid function. The whole system is designed and simulated with several different input data.

Abstract:In this paper, we have proposed a time efficient, energy saving and robust broadcast/multicast protocol for reconfigurable cluster-based sensor network. In our broadcast protocol, a broadcast can be executed in rounds and each node needs to be awake in rounds, where and d are the degrees of G and the sub-network induced by the network backbone, respectively, and h is the height of the backbone. When k channels are available, the broadcast can be executed in rounds and each. We show that our broadcast protocol can be readily modified to the one for multicast. The cluster-based architecture used in this paper for a sensor network is an improved version in [19]. The proposed network architecture is self-constructible and self-reconfigurable by using two topological management operations: node-move-in and node-move-out. Details of the protocol along with experimental results are discussed. Simulation results show that the protocol performance is much better than that in the theoretical analysis. IntroductionWireless sensor networks (WSNs) are clear application specific and have specialized communication patterns in which broadcast, multicast and data gathering are more important than traditional point-to-point communication in computer networks. The geographical topology of a WSN changes when network connectivity changes. For example, a power-trained sensor node withdraws its connection from its network when its battery voltage is low and comes back to the network when it is recharged. When the topology of a WSN is changed as such, the routing protocol and network architecture are necessary to be updated.Broadcast protocols have been well studied in WSNs. Given a flat WSN, say G (an unstructured WSN formed naturally after sensor nodes are deployed) with n sensor nodes, assuming that the nodes know only their IDs and use a single radio channel without collision detection capability, the lower bound of a broadcast is rounds [1]. An broadcast is achieved in [9]. If the nodes have topology awareness, the lower bound of a broadcast can be ) (n ) (n O *

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