Exprimental investigation of the GSM transmission quality in the vicinity of the power line system

In this paper we have analyzed the GSM (Global System for Mobile communications) transmission quality in the vicinity of the power line system and its EM effect to the RF interface of the mobile telecommunication system. These electric lines and its associated equipments produce the noise around their proximity, which are likely to have dangerous effects on their environment. The characteristic of the power line noise and its correlation with the GSM burst; showing that the considered noise source to the mobile station (MS) and Base Transceiver Stations (BTS) of GSM system is due to the presence of fundamentals and harmonics fields (electric and magnetic fields) in the proximity of power lines functioning at the permanent state; specially the present of the 5^th harmonic field which is close to the GSM pulsed field at the frequency 217 Hz. The measurements and simulated results of GSM system were done inside and outside an area of 50m distance from the tower of power line. These experiments take on consideration the two real situations (in the case of the presence of BTS and in the case of the absence of the BTS of the GSM equipments). It has been observed that the effect of the power line on the quality of service (QoS) of GSM signal in idle mode and dedicated mode is more important, and the experimental results show the influence leading to a degradation of the reception level (RxLev) and the reception quality of the GSM signal (RxQual) with an important Frame error rate (FER).