Signal Anti-Jamming Through Encrypted Spreading Codes Based On Frequency Hopping Spread Spectrum

Now a days is fully digitalized time and communication is the one of the most important part in our modern life [1]. Everywhere digital system are present like railway, radar, satellite, missile launchers, GPS, Wi-Fi, radio transmission, cellular mobile communication, vehicles, sensors,  etc. digital signal play very important role in digital communication system for assessment of signal security, anti-jamming is very important for secure communication system, interferences [2]. In preset time many technique are developed for anti-jamming but here we are focused on Frequency hopping spread spectrum anti-jamming improvement with Encrypted spreading codes. This technique is based on encrypted PN-sequence which is based on frequency hopping spread spectrum modulation technique. This technique give better result in signal anti-jamming in terms of signal-to-noise ratio, throughput and Bit error rate. This new method based on encryption algorithm applied over spreading codes, named hidden frequency hopping is proposed to improve the security of FHSS. Existing data communication systems based on spread spectrum techniques, which is very useful us. This paper addresses a study of spread spectrum signal by analyzing the performance of the system using the MATLAB code. To achieve this, after a brief introduction the principles of the spread spectrum systems are explained in details, then the techniques of the detection which are used to retrieve the message signal are presented..