A new packet detection algorithm for IEEE 802.15.4a DBO-CSS in AWGN channel

In this paper, we propose a new packet detection algorithm for differentially bi-orthogonal chirp-spread-spectrum (DBO-CSS) over multiple piconets. Because of the band hopping property of the DBO-CSS, the conventional packet detection algorithms based on auto-correlation cannot avoid side band noise. And the conventional algorithms employed in DBO-CSS systems are not performed well over simultaneously operating piconets (SOP) because they did not consider the waveforms of signal. First, the proposed detector includes matched filters to eliminate the side band noise and to make SNR at the end of matched filters maximal. Second, the proposed detector also includes auto-correlators in order to make outputs of matched filters inphase. Finally, the proposed detector gathers the energy of all sub-chirps and employs the Permutator in order to operate regardless of piconet. Simulation results show that we can detect packets by using the proposed algorithm compared with the conventional one in about -4 dB SNR with the same miss detection probability and the false alarm probability between them.