RAKE Receiving Methods for IEEE 802.15.4a CSS System

In this paper, we propose two RAKE receiving methods of the chirp spread spectrum (CSS) system to suppress the influence of the multipath-fading channel. The first one has low complexity by using the simple accumulator to collect the energies of the multi-paths. The second one can enhance the PER performance of the differential detection by adopting the concept of the multiple-symbol differential detection (MS-DD). We verified the proposed architectures through Monte-carlo simulations in diffuse channels. The simulation results show that the RAKE receiving methods can efficiently reduce performance degradation in multipath channel.