Simulation of Anti-Jamming Technology in Frequency-Hopping Communication System

Abstract

Frequency-hopping communication is widely used in the field of military communication, which has the capability to resist interference. In frequency-hopping system, narrowband interference signals exist in partial dehopping frequency-hopping signals, equivalent to time-varying interference signals existed in the frequency-hopping signals. Through integrating the diversity combining with singular value decomposition method, this paper detects the frequency-hopping points and then combines with undisturbed frequency-hopping signals. MATLAB simulation shows that narrowband interference is well restrained and the system BER is obviously improved.

Overview of commonly used spread spectrum techniques

“…Frequency hopping is a spread spectrum technique that extends a signal to a wide bandwidth by rapidly changing the carrier frequency [9] . The transmitter and receiver ends of the FH system are shown in Figure 2 [8] Relative to the traditional fixed-frequency communication form, frequency hopping system has many fixed-frequency system can not be comparable to the advantages: the first one is strong anti-jamming ability: frequency hopping system using random frequency fast switching and long periodicity, high randomness of the pseudo-random code generated by a large number of different frequency combinations, so that its frequency hopping law can not be interfered with by the interference party to grasp the accuracy, thus making frequency hopping signal is more difficult to be captured and interference, so it has a very strong anti-jamming ability.…”