method establishes synchronization with high accuracy within one burst. This shortens the WT receiving span and reduces the DL overhead.6.Uplink Synchronization. A transmission automatic frequency control technique is used at the WTs to eliminate the UL overhead for the frequency synchronization [12] . The AP stores the entire burst within the narrow aperture, and clock and frame synchronization are established by differential detection and cross correlation of the training symbols for channel tracking needed for coherent detection. This can also eliminate the UL overhead for the exclusive use of the clock and frame synchronization, and a highly effi cient transmission can be achieved.
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