A novel parameters estimation and code recovery approach of spread spectrum code based on distributed cooperation under non-collaborative condition

This paper proposes a novel parameters estimation and code recovery approach of spread spectrum code based on distributed cooperation under non-collaborative condition. The proposed approach takes full advantage of the difference in the characteristic between direct sequence spread spectrum (DSSS) signals and noises to filter out the high frequency component and some noises by wavelet decomposition in monitor nodes. And the fusion decision based on the credibility of the monitor nodes is employed in sink node, which can improves the performance of parameters estimation and code recovery of spread spectrum code and reduces the impact of these incredible monitor nodes on the fusion decision. Theory analysis and simulation results show that the proposed approach can decrease the impact on parameters estimation and code recovery of spread spectrum code resulting from the lack of prior knowledge and the recovered code by these incredible monitor nodes. So it can accurately recover the spread spectrum code so that it can help the attacker to access to DSSS systems in wireless network space.