Digital AGC based on coherent adjustment cycle for DSSS receiver

In order to meet the requirements for zero value stability of direct sequence spread spectrum (DSSS) signal processing in high dynamic scenario, digital automatic gain control (AGC) is employed to regulate power. However, conventional AGC causes degradation in the synchronization performance of DSSS receiver. Based on the theoretical analysis of the influence of digital AGC on DSSS signal synchronization, this paper proposes a new AGC algorithm, which is applicable to multi-channel digital DSSS signal receiver. By making power adjustment cycle and synchronization cycle coherent with each other adaptively, the influence of digital AGC on subsequent synchronization processing has been eliminated. Theoretical analysis, simulation results and experimental data verify the validity of the proposed algorithm. By virtue of the proposed algorithm, the influence of digital AGC on DSSS signal synchronization is eliminated. This algorithm applies to an aerospace engineering project successfully.