is that the RF chain comprising at least two wireless communication apparatus is provided. That the wireless communication device can use at least two RF chains for performing feature detection to reduce the data communication interruption is silent time (quiet time) or the no . During a single RF chain it is characteristic detected because one RF chain is capable of performing data communication , that the wireless communications apparatus to meet the service quality (Quality of Service) required by the user . ; cognitive wireless , sensing , spectrum , frequency , in- band, out-of-band, energy detection , feature detection
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