GPS (Global Positioning System) has been used to track living beings and devices. It is a vital tool and indispensable over the last few years. Different types of applications including military and civil applications. In this work, a review of the modern application areas and a discussion of the benefits of GPS tracking are given. The software architecture of several tracking systems to position and track a lost child. An analysis of monitoring and tracking technologies are studied in this work. A comparison of different techniques is given. In this technology, navigation of the user (mother) to the destination (child) is implemented and the signal is analyzed. Real simulation of GPS receiver which enables the additional control of the user to the destination by using also GSM towers stations. The angle, position and distance are checked to know the exact position. The error signal has been analyzed for the system for more accurate results. So the new GPS system gives more accurate and fast results. This paper also reviews some of the new applications and discusses the benefits and issues of GPS tracking. It then presents a software architecture of a general tracking system to locate lost objects.

Communication systems are basic in the modern world. OFDM has been used for noise abolition in LTE generation. In this paper, a simulation of OFDM system has been used by MATLAB GUI. Four cases have been studied, simulated, and analyzed. According to the type of noise in the channel, we used these parameters as an effect on the system. The effect of three parameters has been used for each case. The parameters include the number of the subcarrier in OFDM system, the number of samples on each subcarrier and the signal to noise ratio. The simulation used in this paper according to the mathematical communication equations gives accurate and fast results.