Optimal pilot power setting in CDMA systems

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Dr. Jeney Gábor
Department of Networked Systems and Services

In CDMA systems, a so-called pilot signal is needed for the downlink traffic to work. Power of this pilot signal affects the performance of the downlink channel. The goal of my studies is to find out how much power should be allocated to the pilot signal to maximize the data throughput of the system. If we manage to decrease the needed pilot power, we free up capacity for useful data traffic (which increases HSDPA performance), and decrease the interference affecting the other base stations (which perceived as further speed increase). For this I created a model, that simulates the wave propagation properties faithfully, takes certain traffic factors into account (intermittent signal transmitting at the base stations) and decreases the needed pilot power. The model is important also when there is no communication in the cells, because significant power savings can be achieved with the decreased pilot power levels.

Besides creating the model, I also wrote a simulation program that uses it, enabling multiple scenarios to test the model. I also confirm the efficiency of the theoretical model with simulations created with the program.


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