The current ns-3 implementation of the 3D Gauss-Markov mobility model (3D-GMMM) allows mobile nodes to reach and bounce off the simulation boundaries. This causes sudden and unnatural movement of the nodes in the vicinity of the simulation boundaries. In this paper, we present a modification to the current ns-3 implementation of the 3D-GMMM. We follow an approach in which mobile nodes are direc...

In the paper, we compare simulation modes and programming interfaces of three popular network simulators: ns-2, J-Sim and OPNET. Our observations and conclusions are based on a “realworld” FTP application case study, and also on our earlier projects.

It is shown that a non-square (NS) 2-ary quadrature amplitude modulation (QAM) can be decomposed into a single-parity-check (SPC) block encoder and a memoryless modulator with independent in-phase (I) and quadrature (Q) symbol mapping. When NS-2-QAM is concatenated with a forward-errorcorrecting (FEC) code, iterative demodulation and decoding of the FEC code and the inherent SPC code of NS-2-QA...

Aims. We aim to investigate the consequences of a fast massive stellar remnant – black hole (BH) or neutron star (NS) encountering planetary system. Methods. modelled close encounter between actual Solar System (SS) and 2 M ⊙ NS 10 BH, using few-body symplectic integrator. used range impact parameters, orbital phases at start simulation derived from current SS velocities, incidence angles relat...

This B.Sc. thesis report documents an implementation of the Pastry Distributed Hash Table (DHT) for the Network Simulator 3 (NS-3) simulation environment. To our knowledge, this thesis constitutes the first and only effort to cover the lack of any Pastry implementation for the NS-3 discrete event simulator. Given that NS-3 comes as an open source distribution, it is expected to meet the high de...

Explicit Congestion Notification (ECN) transfers a clear indication of congestion through the network and, therefore, gives a possibility to construct closed-loop control of effective transmission rate. In the paper, a simulation model of ECN-capable multicast multimedia delivery in ns-2 environment is discussed. The model includes complete ECN-capable network infrastructure (sender, receivers,...

This paper describes a new design of low power 3-2 compressor circuit for high speed multipliers. Power consumption of proposed 3-2 compressor circuit varies from 0.355 nW to 1.6964 nW and delay varies from 2.0390 ns to 2.0224 ns. Further, power delay product of proposed circuit varies from 7.23×10 -18 (J) to 34.30×10 -18 (J) with varying supply voltage from 1.8V to 3.3V. The proposed compresso...

—Ad-hoc networks are basically peer to peer multi-hop mobile wireless networks in which the information packets are transmitted in a 'store and forward' manner from a source to an arbitrary destination via intermediate nodes. The main objective of this paper is to evaluate the performance of various ad-hoc networks routing protocols viz.

A new chip design paradigm called Network on Chip (NOC) offers a promising architectural choice for future systems on chips. NOC architectures offer a packet switched communication among functional cores on the chip. NOC architectures also apply concepts from computer networks and organize on-chip communication among cores in layers similar to OSI reference model. We constructed a protomodel us...