Study of spectrum sensing scheme using received power within preamble signals

Time Division Duplex (TDD)-based bidirectional digital field pick-up unit (FPU) system is now being studied. This new digital FPU system shares its frequency band with other wireless systems. Therefore, digital FPU system should detect and avoid the interference from other systems of which the signal format is unknown. To FPU system, it is impossible to apply conventional spectrum sensing schemes which detect known signals such as preamble in other systems. We studied the spectrum sensing scheme using the received power within preamble signals of FPU system. From the results of the baseband link-level computer simulation, it was confirmed that the proposed scheme achieved an excellent performance of the interference detection (the interference false detection rate both with and without the presence of the interference).