Frequency offset estimation of WiMAX using repeated preamble

Wide area network for cellular communications, are implemented by towers. The main advantage of WiMAX is that it supports movement from one place to another. However this WiMAX faces the mismatch in frequency during transmission which in turn leads to inter carrier interference and loss of orthogonality in the carriers used for transmission. Thus CFO estimation and compensation needs to be carried out for these systems to increase the efficiency of data transmission. The CFO estimation technique used here is a data aided technique that makes use of a preamble to attain the estimate. The preamble has been designed using optimized GCL sequences which increases the accuracy of CFO estimation. The method used for phase compensation in this method is phase rotation.