Direct sequence spread spectrum scheme for an unmanned aerial vehicle PPM control signal protection

@article{Todorovic2009DirectSS,
  title={Direct sequence spread spectrum scheme for an unmanned aerial vehicle PPM control signal protection},
  author={Branislav M. Todorovic and Vladimir D. Orlic},
  journal={IEEE Communications Letters},
  year={2009},
  volume={13}
}
In this letter, a new direct sequence spread spectrum scheme for protection of an unmanned aerial vehicle (UAV) binary pulse-position modulated (PPM)control signal is proposed. The UAV PPM control signal consists of data frames. Each of them contains a synchronizing pulse followed by a number of shorter pulses equal to the number of channels N. At the beginning of any pulse is the pause long 0.3 ms. The proposed scheme uses (N + 1) pseudonoise (PN) codes: one of them (PN0) is assigned to the… CONTINUE READING