Clear Channel Assessment
Clear Channel Assessment (CCA) is not strictly an OFDM synchronization algorithm, but a network synchronization method. However, it is closely related to packet detection problem and thus it is included in this chapter. The overall system performance of IEEE 802.11 WLAN is crucially dependent on high quality CCA algorithm, so the algorithm has to be carefully designed. The IEEE 802.11a standard has two different requirements for the CCA algorithm. The first is the detection probability when a preamble is available and the second is the detection probability when the preamble is not available. The requirement for the first case is that the CCA algorithm shall indicate a Busy channel with >90% probability within 4μs observation ...
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