Experimental assessment of WiMAX transmissions under highly time-varying channels

Abstract

Modern wireless communication systems, such as WiMAX, rely on Orthogonal Frequency Division Multiplexing, a very robust modulation against frequency-selectivity, but very sensitive to time-selectivity, which is a typical feature in mobility scenarios. In this work, experimental measurements in real scenarios are carried out by employing WiMAX signals including the standard-compliant pilot signals. Highly time-varying conditions are induced by enlarging the symbol period by time interpolation in the digital domain. In addition, the performance of Inter-Carrier Interference cancellation techniques, which take advantage of the WiMAX pilot structure, are tested to evaluate their behaviour under highly time-varying conditions.