A new spread spectrum technique by using orthogonal carrier frequencies

This paper proposes a multicarrier spread spectrum, which uses few carriers, but provides a high processing gain. Normally, the multicarrier spread spectrum applies in a multicarrier CDMA system that must use many orthogonal carrier frequencies, which complicate the system by making it complex. So, one should apply an m-sequence that has a high speed for reducing the number of carrier frequencies. This paper shows that this system can also have a spreading spectrum