With the rapid development of the information age, the demands on communication technology continue to grow. As a crucial communication method, digital communication systems play a vital role in achieving efficient transmission speeds and reliability. This paper centers around modulation techniques within digital communication systems, with a specific emphasis on the analysis of reducing bit error rates and enhancing transmission speeds. Consequently, this study delves into the current methods employed for achieving an all-encompassing optimization of both transmission speed and reliability, while also proposing novel insights. The paper will detail the benefits and drawbacks of contemporary noise processing techniques that aim to enhance channel performance and explore methods for their improvement.