Electronic and Communication - Engineering

Abstract: Microwave link is one of several transmission media in modern telecommunications networks; it provides reliable data transfer in a wide variety of systems such as GSM, WLL, televisions and many other applications that need data transfer with reliable transfer rate and bandwidth. This thesis studies the point-to-point, line-of-sight microwave links design and the effective parameters on link performance. It presents the diffraction losses due to obstacles within the first Fresnel zone of a link.

Abstract: The ground stations all over the world have grown in the last 60 years as a part of satellite to earth link systems. One of the important applications for the ground station is to receive the space images acquired by remote sensing satellites. These images are widely used for an applications in the field of cartography, geology, oceanography or intelligence, etc.In this thesis, a proposal of a ground station design configuration that satisfies the needs and requirements of Iraqi users is presented.

Abstract: A major source of impairments in Orthogonal Frequency Division Multiplexing (OFDM) wireless communication systems is the imbalance between the real part (Inphase (I)) and the imaginary part (Quadrature (Q)) of the complex signal. This thesis addresses problem theoretically and introduces a blind estimation algorithm to estimate and then compensate the I/Q imbalance. The preformance of a direct-conversion receiver implemented in OFDM systems is analyzed in the presence of I/Q imbalance. Two types of imbalance (mismatch) between the I-and Q-branches are considered here.