Scopul nostru este sprijinirea şi promovarea cercetării ştiinţifice şi facilitarea comunicării între cercetătorii români din întreaga lume.
Autori: Matthias Hildebrand, Klaus David, Guihua Piao, Gabriel Cristache,Frank Fechter*, Rolf Sigle*, Anja Warich*
Editorial: IST Summit on Mobile & Wireless Communications, Aveiro, Portugal, June 15 - 18, 2003, 2003.
The upcoming 3G systems like UMTS are defined using code division multiple access schemes (CDMA) in order to improve system characteristics compared to legacy systems using time division multiple access schemes (TDMA). [1, 2]
The use of CDMA results in an interference limited system where the transmissions of close-by concurrent communications have direct impact on the capacity and coverage of a cell [2, 3]. Since the coverage of a CDMA cell changes when the current load is changing, the cell seems to “breath”, hence the term “cell breathing” is used to describe this behavior.
In  an efficient approach for simulating a CDMA-based cellular system was introduced, showing first results on the cell breathing effect. Here this topic is investigated in more detail.
The first part of this article gives an introduction as well as a short overview on the simulation environment. The second part discusses the simulation results and in the third part a summary is given.
Cuvinte cheie: CDMA, cell breathing effect, simulations, wireless