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Security of different networks has always been a primary concern as its necessary to protect the resources being shared and communication being done among the legitimate users. If we let down our safeguards, an attacker can transform the routing protocol and interrupt the network operations through mechanisms such as packet drops, flooding, data fabrication etc. MANET is a type of network whose dynamic...
Bitcoin is the most popular cryptocurrency today. A bedrock of the Bitcoin framework is mining, a computation intensive process that is used to verify Bitcoin transactions for profit. We observe that mining is inherently error tolerant due to its embarrassingly parallel and probabilistic nature. We exploit this inherent tolerance to inaccuracy by proposing approximate mining circuits that trade off...
Multipath remains a dominant source of error in satellite-based navigation, despite a great deal of effort by researchers and receiver manufacturers to reduce it. Mitigation of multipath errors is especially difficult when the Doppler shift between the direct and secondary propagation paths is very small (approximately 1-2 Hz) and this is usually the case in urban canyons where the reflectors are...
The network topology in Mobile Ad hoc Networks (MANETs) dynamically changes due to mobility of nodes and power constrained, hence routing is a challenging issue in these networks. QoS aware routing is needed to provide optimal routes as a function of parameters like bandwidth, delay, packet loss etc. Our approach is focused on QoS enabled route discovery procedure which involves estimation of node...
In MANET, nodes are able to communicate with each other for a short range only. To extend the communication range of MANET, an Internet gateway is used which acts as a bridge between the conventional network and MANET. To enable the long range communication, a MANET node needs to discover and then select the appropriate gateway using various proposed schemes. Some of the schemes suffer from lack of...
AODV protocol is a comparatively more popular on demand routing protocol in mobile ad hoc networks. However, reliability in terms of data communication is not much satisfactory in traditional AODV. This paper presents an AODV with end to end reliability (AODV-EER). The main idea of proposed modification in AODV is to find the route with lowest drop rate from source to destination. We also propose...
Software-based path delay fault testing (SPDFT) has been used to identify faulty chips that cannot meet timing constraints due to gross delay defects. In this paper, we propose using SPDFT for a new purpose - aggressively selecting the operating point of a variation-affected design. In order to use SPDFT for this purpose, test routines must provide high coverage of potentially-critical paths and must...
Encoders play a critical role in performance of analog to digital converters (ADCs). These encoders can be implemented in different topologies depending upon the required performance ADCs. In this paper different thermometer to binary (T2B) encoders employed in flash ADCs are analyzed in terms of bubble error, delay and power consumption. ROM encoder, Wallace tree, Fat tree and Multiplexer based encoder...
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