A single-frequency duplex/multiplex security communication system

A full duplex/multiplex security communication system with single radio carrier frequency is described. Totally different from traditional simplex or double-frequency-full-duplex radio techniques, this novel communication system utilizes time compression and expansion techniques and uses the idea of time slot allocation for multiplexing. By this scheme, full-duplex/multiplex communication system can be established on a single carrier frequency. With conventional radio techniques, it will be quite complicated to establish a full triplex or quadruplex communication system. With the proposed scheme, it is not difficult to implement this kind of system. The intrinsic security characteristic of this system is attractive. The signal compression algorithms provide various levels of security. Segmenting time slots and synchronizing signals provide another level of complexity