Reliable Hidden Communication Scheme Based on SCFDM-TDCS System

The purpose of hidden communication is to not be detected, and can transmit information. The transformation domain communication system (TDCS) is a good hidden communication system, which can change the spectrum of sending signals according to the changes in the surrounding environment and hide useful information in the interference signal. The orthogonal frequency division multiplexing-transformation domain communication system (OFDM-TDCS), which has been proposed in some papers, has the characteristics of high spectrum efficiency and strong resistance to multipath decline, which can improve the communication efficiency of TDCS. However, the peak to average power ratio (PAPR) of the OFDM-TDCS is higher, and the anti-interference effect for the sweep interference and the narrow-band noise interference is not good. This paper presents the single-carrier frequency division multiple-transformation domain communication system (SCFDM-TDCS), which has the two advantages of lower PAPR and multi-carrier toughness. For the narrow band interference, the SCFDM-TDCS system can also choose different subcarrier mapping methods to complete reliable hidden communication.