MATLAB Simulation of BPSK Modulation Communication System in AWGN Channel

Binary Phase Shift Keying (BPSK) is a fundamental digital communication modulation technique employed in Additive White Gaussian Noise (AWGN) channels. This technique encodes binary digital information by converting it into phase shifts of a carrier signal. The receiver decodes these phase shifts to recover the original information. To simulate and evaluate such communication systems, MATLAB provides an ideal platform for creating comprehensive simulation programs. The implementation typically involves generating BPSK modulated signals using phase reversal (0° and 180° phase shifts representing binary 0 and 1) and introducing AWGN noise using MATLAB's built-in functions like awgn() or randn() to emulate real-world communication environments. Key implementation aspects include signal generation using cosine waveforms, symbol mapping, and noise variance calculation based on signal-to-noise ratio (SNR) parameters. By systematically adjusting SNR values, researchers can analyze system performance across various noise conditions, obtaining critical metrics like bit error rate (BER) that serve as foundation for system optimization and enhancement. The simulation typically employs coherent detection algorithms where the receiver correlates received signals with reference carriers and makes decisions based on phase comparisons.