This paper presents the WiMAX- IEEE 802.16e real throughput analysis, measurement and evaluation. As throughput is a term with diverse definitions, the analysis starts from a theoretical modeling for throughput estimation in ideal radio propagation conditions, based on IEEE 802.16e standard and related works on throughput estimation. The tests were conducted using CTC (Convolutional Turbo Code) channel coding scheme with the rates 1/2, 2/3, 3/4 and 5/6 and QPSK, 16 QAM and 64 QAM modulations. The experimental study was aimed to determine the maximum data transfer rates for each type of modulation and coding rate in a quasi-ideal transmission medium with line of sight between the subscriber station and base station. Important results were obtained using WiMAX Window Scaling option for increasing the Windows Size. The experimental results, interpretations and conclusions are used in order to provide improvement of real throughput offered by WiMAX to user experience, including optimization rules for a better network operation in some specific conditions.