Radio communication systems are very widely present in our current smart lifestyles. It consists of two ends, which can carry the transmitter’s information to the receptor. Before installing any radio communication system, it is necessary to analyze the link resources. Hence, this analysis allows the determination of the received radio communication strength to prove if it is sufficient for the link to work correctly and assure a high quality of service. For this reason, new services and technologies are integrated. The objective of the present work is to improve the performance of the radio communication link of 4G systems. The study is based on real measurements using the drive test. The data collected by the drive test are analyzed to increase the performance of the radio communication. Based on this data analysis, recommendations and suggestions are issued for improving the radio communication link. The obtained results indicate a significant amelioration in the performance of the radio communication link.

In this paper, a Backstepping Sliding Mode controller is designed for the DC-DC buck converter under inherent nonlinearity and time variation. The proposed controller design is based on the integration both the merits of Backstepping control method and sliding mode control method (SMC). Based on Lyapunov synthesis approach, the derived controller can closely track change in reference output voltage and guarantees stability converge. Simulation results demonstrate the effectiveness and robustness of the proposed combination approach