Design of long code direct sequence spread spectrum rake receiver to deal with repeater interference

A code design with a very high repetition length is used to strengthen the links of a direct sequence spread spectrum against all types of detection, eavesdropping and deception. Synchronization is one of the most important parts of a spread spectrum system. Assuming the Raisin channel, the signal will reach the receiver from different paths, and by using the rake receiver and correcting the delay of each path, the signals will be combined. In the direct sequence spread spectrum receiver, the signal is received from the direct path and the reflected path. Considering that the repeater interference prevents code interception, in order to deal with it, a rake receiver has been used. In this research, repeater interference and its effect on code interception is investigated and simulated, and the performance of the spread-spectrum direct sequence system of all long codes is compared based on the bit error ratio in the presence and absence of repeater interference. Then an innovative method, which is the main innovation of this research, is presented as a smart rake receiver, which is a rake receiver to deal with interference and increase the signal-to-noise ratio by distinguishing between the path of repeating interference and the direct vision path and the multipath signal eliminate the repeater interference effect