The proposed Long Term Evolution (LTE), for UMTS network, study by the Third Generation Partnership Project (3GPP) towards forth generation mobile telecommunication systems was one of the significant trends toward meeting the requirements and services of these future systems. This paper analyzes the requirements for this evolution and evaluates the performance of the Orthogonal Frequency Division Multiplexing (OFDM) UMTS-LTE system under different propagation impairments (AWGN, Pedestrian and Vehicular multipath fading channels of different speeds) in terms of bit and symbol error rates (BER and SER) for different modulation formats.