RIGOL DG5000 Series - Manual (Page 132)

RIGOL Chapter 8 FH Output (Option)
User’s Guide for DG5000 8-2
FH Overview
Traditional radio communication, which works at a fixed frequency, could easily be
intercepted and electrically disturbed and the security is very poor.
Frequency hopping (FH) is a spread spectrum technique which uses carrier waveform
frequency hopping to realize spread frequency spectrum and is widely used in
anti-interference communication system. In FH communication, the radio frequency
bandwidth used for transmitting the signal is tens, hundreds even thousands times of
its initial bandwidth. But for a certain time, it works at a certain frequency.
In FH communication, the pseudo-random sequence used to control carrier frequency
hopping is usually called “FH Sequence”. Under the control of the FH sequence, the
hopping rule of the carrier frequency is called “FH Map” which reflects the change law
of the carrier frequency. The commonly used FH sequences are pseudo-random
sequences designed on the basis of m sequence or M sequence. The pseudo-random
sequences are realized through the combination of shift register and feedback
structure which has simple structure, stable performance and could be quickly
synchronized.