Incremental-data stealth-transmission method in DSSS

A direct-sequence spread-spectrum (DSSS) signal has many advantages, such as low SNR and strong anti-jamming ability; thus, it is widely used in various military and civil communication systems. However, hiding and high-data-rate transmission technologies have become the key factors affecting the future applications of the existing DSSS. To solve these problems, an incremental-data stealth-transmission (IDST) method is proposed, which stealthily transmits incremental data through variations in the spread spectrum function and alternation of the weighted fractional Fourier transform modulation order. The incremental data are not transmitted through a real channel but through the function relationship to achieve index transmission. Without affecting the spread spectrum gain and SNR tolerance of the original data, the proposed method greatly improves the amount of information transmitted and enhances the concealment of incremental data.