Effects of Synchronous Timing Gap on Energy-Efficient MC-CDMA On-Demand WSNs Using Packet Combining Scheme

Abstract

In this study, the effects of different packet reception timings on the packet success rate (PSR) are investigated in a 3-mode-based MC-CDMA on-demand WSN system with a packet composition method. In particular, PSR in the carrier model, which takes into account the code phase difference between pseudonoise codes and the phase difference between carrier waves, is evaluated. Results indicate that the PSR performance is significantly degraded compared with the conventional evaluation results with baseband transmission, in which only the code phase difference between pseudonoise codes is considered. It is also found that there are two steps that improve PSR: increase the number of slots to be combined (N_comb) and increase the number of nodes to be woken up (N_wk).