A delay diversity system based on IEEE 802.15.4 with RAKE-like receiving

In this paper, we investigate the application of delay diversity in die system compliant to the IEEE 802.15.4 standard. In this delay diversity system, we propose a low complexity RAKE-like receiving algorithm to achieve spatial diversity. A joint channel estimation and time synchronization procedure is developed to guarantee fall diversity and a double correlation approach immune to large frequency offset is adopted to implement the system at low cost. The performance of the delay diversity receiving (DDR) system with two receive antennas is analyzed through Monte Carlo simulations. Test results indicate that the proposed scheme can provide a SNR gain of 5.5dB and 4.5dB respectively for the system in a small and large delay spread environment over the system with single antenna at the PER 1%.