College of Engineering

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.

Abstract: The digital video coding is a rapidly evolving field. Although its applications are numerous (from TV broadcasting to video conference), bit rate reduction is always needed .This has led to intensive efforts toward effective video compression techniques. In this work an adaptive codec scheme of H.263 standard that depends on transform coding (DCT) and quantization process in compression is proposed. In addition motion estimation search algorithms were used to estimate the predictive frames.