Securing Physical Layer for FHSS Communication System Using Code andPhase Hopping Techniques in CDMA, System Design and Implementation

Saifuldeen A Mohammed

doi:10.31026/j.eng.2020.07.13

Abstract

The Frequency-hopping Spread Spectrum (FHSS) systems and techniques are using in military and civilianradar recently and in the communication system for securing the information on wireless communications link channels, for example in the Wi-Fi 8.02.X IEEE using multiple number bandwidth and frequencies in the wireless channel in order to hopping on them for increasing the security level during the broadcast, but nowadays FHSS problem, which is, any Smart Software Defined Radio (S-SDR) can easily detect a wireless signal at the transmitter and the receiver for the hopping sequence in both of these, then duplicate this sequence in order to hack the signal on both transmitter and receiver messages using the order of the sequences that will be recognized for next transmissions. In 2017 Code and Phase Hopping Techniques are both proposed to resolve the most recent problem in security-related, but not with FHSS, therefore in this paper presents a new composed proposed system will progress Phase Shift and Code Hopping in Code Division Multiplexing Access (CDMA) to complement with FHSS; because the wireless Communications systems security in the last years became a nightmare for some individuals, also companies, and even countries, also join them needing for higher bits rate in the wireless channels; because of next-generation communication system 5G-6G and the evolution in social networking, IoT, stream media, IoE, visualizations, and cloud computing. The new ideas can be applicable for a large number of users, also fast implementation without synchronization, as well as without any focus on encryption or keys-exchanges, at completion all results are simulation in MATLAB R2017b, the results have been tested by using 8 users in the same time, also our results showing promises effects on security for both applied systems Phases Shift and Codes Hopping especially the Code Hopping, therefor; our results encouraged us to complete research and compare our system with other.

Highlights

INTRODUCTION forFrequency-hopping Spread Spectrum (FHSS), Code Hopping Spared Spectrums with FHSS (CHSS) and PSHSS‬‬‫‪FHSSit stands for Frequency hopping Spread Spectrum andrunningby way of the spreading‬‬‫‪bandwidth frequency of propagatingwireless wave signals, remain to change jumping at‬‬‫‪encoded sequence order time sequence intervals
Fig. 3explains the total systemthat we previously proposed in this paper, all user data will be work as input for complex Code Division Multiplexing Access (CDMA) which is clearly described in (Mohammed, 2011), in
All figures The foremost Result as shown will be exposed to the viewer that, it imaginable to make the new scheme that proposed FHSS and PH or CH, the results above compare between the Phase Hopping and Code hopping in DS-JCDMA with FHSS in Additive White Gaussian Noise (AWGN) wireless channel, the results enlighten that the Code Hopping with FHSS (CHFHSS) is extra protected from the Phase Shift Hopping with FHSS (PSH-FHSS), and we can using together systems if its requirement extra protected scheme in the same time exclusive of growing physical layer

Summary

THE SUGGESTEDSCHEME FOR FHSS COMBINED WITH CH AND PSH

TheFig. 3 and Table. 1 will introduce our novel scheme with its parameters and features, that willbe intended toFHSS with PSH and CH althoughmoreover with CDMA therefor we will rename as PSHSS, CHSS. 1 will introduce our novel scheme with its parameters and features, that willbe intended toFHSS with PSH and CH althoughmoreover with CDMA therefor we will rename as PSHSS, CHSS. Fig. 3explains the total systemthat we previously proposed in this paper, all user data will be work as input for complex CDMA which is clearly described in (Mohammed, 2011), in. Fig. 2which is have PSH and CH controllers parametersalso we will use Eq 25 for modulation and Eq 27 for demodulation with, of certainly, Eq 1 where u(t) will be here DS-JCDMA data as shown below in Eq 29 where both Fhss(t) and c(t) find in Eq 3 and Eq 2respectively. Additive White Gaussian Noise in wireless Channel (AWGN).Below is Table 1. Number matrix and (R) for real 4- Safe matrix ( 0S8), (C) number matrix for code hopping. 5-Complex-Wavelet filtermatrix (WSafe2) 8x8, (C)

Binary Modulation for all user

FIGURES RESULTS