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Ad-hoc wireless multi-hop network is communication network that consist of wireless nodes, placed together in an ad hoc manner, with minimal prior planning. All nodes have routing capability and forward data packets for other nodes in multi-hop fashion. Since many applications have QoS (quality of service) requirements such as delay and throughput, it is imperative that the wireless part of the communication...
This paper briefly describes the PhD research work on Robust FPGA Design Under Variations. The work proposes design techniques in three primary areas, viz., power yield enhancement, timing yield enhancement and IR-drop reduction. An architecture and CAD enhancement technique is proposed for improving the timing yield of FPGAs under process variations. Two different techniques are proposed for improving...
Leakage power is a key challenge in VLSI design, and process variations have aggravated the problem. Interconnects have become very critical in modern VLSI designs and have started to play a major role in determining the power and performance of a design. Certain VLSI circuits such as FPGAs are interconnect dominated, such that their performance and power are largely governed by the interconnects...
In this paper, we study a wireless sensor network (WSN) as a social network in which the embedded sensors are the main entities as opposed to human beings in a traditional social network. In wireless sensor networks, the nodes resemble individuals in a way that they communicate with their peers, sometimes selectively hiding some information, sometimes selectively exposing some other information, generating...
We propose partial and full link reversal algorithms to bypass voids during geographic routing over duty-cycled wireless sensor networks. We propose a distributed approach that is oblivious to one-hop neighbor information. Upon termination of the algorithm, the resulting network is guaranteed to be destination-oriented. Further, to reduce the delays incurred under reactive link reversal, we propose...
One of the challenging issue in wireless sensor networks (WSNs) is efficiently route the multimedia information. In this letter, we propose an efficient geographic routing algorithm for multimedia data transmission such as audio, video, etc., in WSNs. It finds one near to shortest path per iteration and can be performed repeatedly iteration to find more on-demand shortest node-disjoint routing paths...
Maximizing the lifetime of wireless sensor networks under constrained resources is an interesting problem that has gained increasing attention. Most methods assume an ideal link layer model when increasing the lifetime of wireless sensor networks and energy saving techniques using geographic routing remains largely unexplored. Based on a realistic link layer model, we propose a novel geographic routing...
In this paper, we focus on the design and analysis of a torus-based backbone architecture which targets to meet both the low delay and high reliability requirements of avionic time-critical communications. Reliable optical connection between arbitrary source-destination pairs is proposed by enabling four non-overlapping lightpaths between the source and destination, which makes the network tolerant...
The design of power grid network is critical in scaled technologies for reliable operation of a circuit. This paper presents novel CAD techniques for mitigating IR-drops in FPGAs. Placement and routing techniques are developed in the paper for improving the voltage profile of the power grid network. The proposed techniques not only improve the minimum voltage at any node in the FPGA power grid, but...
In macrocell based SoC design, a routing plan to decongest top channel is an important step during floor planning. While previous approaches attempt at reducing congestion of chip as a whole, there is no attempt to specifically decongest top channel. We present an algorithmic approach to decongest top channel by using very few feedthroughs. Results show that compared to conventional methods, we can...
We present SynECO, a framework to achieve predictable timing improvement via incremental resynthesis and replacement. We target timing-critical paths postplacement and resynthesize and replace promising gates. We show since the wire delays are the non-negligible contributors to a critical-path delay, it is crucial to accurately estimate them to make a predictable synthesis modification. For this purpose,...
Energy-aware routing is important in multi-hop wireless networks that are operated by battery power, e.g., wireless sensor networks. To maximize the network survivability, the energy efficiency of paths must be taken into account for route selection. Simple heuristics such as choosing paths with minimal energy consumption do not perform well, because the energy of the nodes on such paths may deplete...
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