In this paper we consider the broadband-narrowband coexistence scenario where the unused spectral gaps in the professional mobile radio (PMR) frequency band are used for broadband data communications. Spectrally conﬁned ﬁlter bank based multicarrier (FBMC) waveform is applied for broadband transmission in order to minimize the interference leakage between the new broadband system and the legacy narrowband system. Fast convolution ﬁlter banks (FC-FBs) are used for ﬂexible waveform processing both on the transmitter and the receiver sides. Furthermore, subband energy detection based methods utilizing FC-FBs are proposed for robust spectrum sensing of the legacy PMR signals of the terrestrial trunked radio (TETRA) family. The main idea in this study is to observe the spectral variability due to primary transmissions by dividing the sensing frequency band into relatively narrow subbands and then comparing the subband energies. The ﬂexibility of FC-FB makes it possible to optimize the broadband waveform processing and spectrum sensing ﬁlter characteristics independently. Our proposed maximum and minimum subband energy based approach shows improved robustness to the uncertainty of noise, considering also the interference due to power leakage effects.
|Name||IEEE Military Communications Conference proceedings|
|Conference||IEEE Military Communications Conference|
|Period||1/01/00 → …|
- Publication forum level 1