Modulation and Demodulation Algorithms and Programming

In this article, we will discuss MATLAB-based modulation and demodulation algorithms and programming implementations for BPSK, QPSK, 16QAM, and 64QAM. We will delve into the fundamental principles and implementation methodologies for each modulation scheme, accompanied by practical code examples. The implementation typically involves key MATLAB functions such as pskmod/pskdemod for phase shift keying schemes and qammod/qamdemod for quadrature amplitude modulation, with proper constellation mapping and signal normalization. Additionally, we will examine performance evaluation and comparison methods for different modulation techniques, including BER (Bit Error Rate) calculations using biterr function and SNR simulations. We will also analyze the advantages and disadvantages of each modulation scheme in various application scenarios, considering factors like spectral efficiency, power requirements, and implementation complexity. Through detailed explanations and code demonstrations, we aim to help readers better understand and apply these modulation and demodulation techniques in practical communication systems.