A Master thesis was discussed in Department of Electrical Engineering / College of Engineering at University of Mosul, specialize in Electrical Engineering, entitled Improving Spectral Efficiency in Communication Systems by different methods, Supervised By Assist. Prof. Dr. Saad Ahmed Ayoob Al_Salami On Thursday, August, 28, 2025. The thesis presented by, “Zuhoor Maher Ismail Fareeq” aimed To study the impact of carrier aggregation and mmWave technologies on spectral efficiency and signal quality in 5G networks, analyzing the impact of subcarrier spacing, Doppler shift, and other factors, and proposing strategies for selecting optimal carriers to improve network performance. The thesis discusses Evaluating the [Read More]