Direct Sequence Spread Spectrum Communication System with Interference

Design of a direct sequence spread spectrum communication system with interference. The PN code is generated by an m-sequence generator and transmitted through an additive white Gaussian noise channel. The received signal at the receiver consists of "useful signal + Gaussian white noise + interference." The received signal undergoes despreading and decision-making to obtain user signal detection results. Plot the bit error rate versus Eb/N0 curves for different spreading gains (gain values of 10, 30, and 50).