AG Kommunikationstheorie

Thema:

Simulation and evaluation of LTE using a realistic model

Abstract:

By increasing demand of mobile users for higher data rate, and lack of unlicensed radio channel, mobile operators trend toward more efficient resource allocation methods, system equipment and components. To forecast behavior of the system with new components in a long run, there is a great need for a system model, and based on it a simulator to mimic the behavior of the system. In building our simulator, one of the main features is the fading channel. One way to model it, is geometry-based stochastic models. Their biggest obstacle is complexity of fading channel calculation for large number of links. Here we try to use an algorithm which results in complexity reduction while keeping the same accuracy. Moreover, we try to implement a new channel model, semi-stochastic channel model, which can be argued to have lower complexity and more accuracy compare with pure stochastic models. Semi-stochastic channel model basically calculates channel power delay profile based on the ray-launching algorithm, then merge this information with a geometry-based stochastic model to simulate the effect of shadowing and moving objects. This model has lower complexity than a pure stochastic model, since the ray-launching can be done in advance and the data is used for the rest of simulation. Besides, it produces fewer scatterer clusters. Other components of the system are built according to the 3GPP standards. Parts, which are not defined by standards, are built in a way that can be replaced due to simple interface between different modules. The result of the simulation can be used to evaluate the performance of the system with a certain configuration.

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