MATLAB Implementation of Binary Offset Carrier (BOC) Modulation

In the field of wireless communications, Binary Phase Shift Keying (BPSK) is a modulation technique where the original signal is multiplied by a sine wave. However, this method is susceptible to interference. To address this limitation, spread spectrum technology based on Binary Offset Carrier (BOC) modulation has been developed. This technique first spreads the original signal using a pseudo-random noise code, then multiplies it with a square wave subcarrier. The multiplication creates spectral splitting, effectively shifting the signal's energy away from the carrier frequency and providing superior interference resistance. This enhances communication stability and reliability, particularly in noisy environments. In MATLAB implementation, key functions include generating pseudo-random sequences using pnsequence, creating square waves with square function, and performing modulation through element-wise multiplication (.* operator). The algorithm typically involves three stages: signal spreading, subcarrier multiplication, and carrier modulation for frequency translation.