Evaluation of Electromagnetic Interference in Wireless Broadband Systems

Nowadays, the electromagnetic compatibility in radio frequency communication systems attracts a great attention as the wireless spectrum becomes overcrowded. A lot of wireless systems operate in the same bands or in the adjacent frequency ones. This operation results in an electromagnetic interference (EMI) among these systems. This EMI can degrade the performance of the wireless systems. Moreover, critical medical equipment, which is near to an electromagnetic radiation field, may be malfunction. A lot of studies handled the EMI phenomenon in radio systems. These studies range from the definition and the causes of the phenomenon to the development of suitable simulation tools for evaluating the EMI value. This paper handles the effect of the EMI existence on the performance of a broadband communication system in a complex radio environment. Moreover, this performance is clarified in a form of bit error rate. In addition, the complex radio environment is modeled as a summation of noise, narrow band interference (NBI), and ultra wide band interference (UWBI). The complete analysis model of a broadband radio system, which is interfered by a NBI and an UWBI, is carried out. Furthermore, the total interfering power is derived in a novel closed form formula. Finally, the performance of the system is simulated.