What term describes a wide-band communications system in which the RF carrier varies according to some predetermined sequence?

Spread spectrum communication is a technique where a signal is intentionally spread over a much wider bandwidth than is strictly necessary to transmit the information. This spreading is accomplished by varying the RF carrier according to a predetermined, pseudorandom sequence known to both the transmitting and receiving stations. Because the signal is spread out, it resembles background noise to unauthorized receivers, providing excellent security and resistance to interference. Distractors like AMTOR refer to specific digital modes, while 'time domain frequency modulation' is a fabricated term.