By Jack L. Burbank
This ebook presents the practising engineer with a concise directory of industrial and open-source modeling and simulation instruments at the moment to be had together with examples of enforcing these instruments for fixing particular Modeling and Simulation examples. rather than targeting the underlying thought of Modeling and Simulation and primary construction blocks for customized simulations, this booklet compares structures utilized in perform, and offers principles allowing the training engineer to make use of to be had Modeling and Simulation instruments. This publication will include insights concerning universal pitfalls in community Modeling and Simulation and useful equipment for operating engineers.
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Additional resources for An Introduction to Network Modeling and Simulation for the Practicing Engineer (The ComSoc Guides to Communications Technologies)
Is there a significant difference in the antenna heights between transmitting nodes? This difference is not captured in the Friis equations, but is a parameter in the two-ray model. In the case where LOS does not hold and there are path obstructions between nodes, the lognormal shadowing model is probably best suited. The geometry of the scenario being modeled is driven by acceptable separation distance between transmitter and receiver. Ultimately, this is driven by the receiver sensitivity of the radios being modeled and the maximum path loss that can be incurred.
NS-2 is currently licensed for use under version 2 of the GNU General Public License. Documentation has historically been poor for NS-2, with users left to rely on online user forums and newsgroups; however, there have been additional information sources emerging recently that may help someone new to NS-2, such as [6, 13]. 2 OPNET OPNET Technologies was founded in 1986, becoming a public company in 2000. The company provides a suite of software tools for network designers and administrators. But its flagship product is OPNET Modeler, which is a software tool for network M&S that was originally developed by the company’s founder as a graduate project while at the Massachussetts Institute of Technology (MIT).
The approach used by the common network simulators and described in  is to pre-compute a data set of multipath components that are time correlated based on time-averaged power, maximum Doppler frequency, and Ricean K factor. This sequence is constructed such that it can be repeated without discontinuities and large simulations may repeat the sequence multiple times as necessary. The statistical validity of this approach is demonstrated in . The effects of large-scale fading are also incorporated into this model as affecting the mean received power and hence the mean of the Ricean or Rayleigh distributed multipath components.