Abstract
- Direct sequence spread spectrum systems appeared and are used to protect the transmitted data DSSS Systems might be one of the solutions for reliable and secured communications. Also, it is one of the approaches used by signals for transmitting bandwidth larger compared to the satisfied frequency related to the original information. The communication systems of SS were vital to suppress interference, complicating the detection and processing of secure communications, the technology of spread spectrum (DSSS) has been initially created for military applications. In a traditional DSSS system, the PN code is the primary key to make the receiver recover the transmitted data. In this paper, by using the MATLAB R2020a is used to simulate the proposed system, it is considered that the transmitter sends data bits and wants to protect the sent data by making each bit send with a PN code consisting of 127 bits randomly without informing the receiver of that. here the artificial neural network (ANN) was used as a tool to find the PN code for each initial value of 7 flip-flops. so, the receiver could detect the transmitted data with BER =0.
Highlights
Communication intelligence (COMINT) receivers are becoming a necessity due to the widespread use of the spread spectrum in both civilian and military applications [1]
Preparation of the data to the Artificial Neural Network (ANN) – Training the input Train the ANN with matrix size 127 × 254, Each column contains 127 bits, which are produced from each initial value of 7 flip-flops for both bits (0,1) as shown in Table II. – Training the output Training the output with matrix size (7 × 254) with all possible cases of the initial value of 7 flip-flops as shown below in Table III to generate 127 vectors of the different PN code consisting of 127 bits for both data bits (1,0)
OF TESTING THE PROPOSED SYSTEM After the training process, the performance of the trained network will be evaluated by applying data to it and checking whether its outputs are still relevant to the targets
Summary
Communication intelligence (COMINT) receivers are becoming a necessity due to the widespread use of the spread spectrum in both civilian and military applications [1]. Advanced approaches were needed for adequately detecting the existence of the contact signal of interest and to extract information from it [3]. The spectrum spreading system is ensuring a very high level of communication security. This system will spread information across a wide bandwidth and make it difficult for a narrow band receiver for deciphering significant information. The spread spectrum (SS) has been defined as a means of transmission in which the signal occupies bandwidth much over the minimum necessary to send the information, the band spread is accomplished by utilizing a code that is independent of the data and a synchronized reception with the code at the receiver is used for de-spreading and subsequent data recovery
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