学号：24102200012南湖学院毕业设计题目：简易 BPSK 相位调制通信系统的设计作 者陈身光届 别2025系 别机械与电子工程系专 业电子信息工程指导老师刘 翔职 称副教授完成时间2025.05摘 要本文设计了一个 BPSK 调制的简易通信系统。系统由发送端和接收端两部分组成。发送端以 STM32 为控制核心，将接收到的数据进行基带差分编码后，控制直接数字式频率合成技术(Direct Digital Synthesis，DDS)的 AD9854 进行 BPSK 调制，并由功率放大器放大后经天线发送出去；接收端由正交解调芯片 MAX2451 和数字锁相环芯片 CD74HC7046 组成的 Costas 环实现载波提取和相干解调，解调后的信号经高速数字锁相环 CD74HCT297 提取位同步后进行基带差分解码。经实测，系统载波频率为 36MHz；传输 1Mbit 数据的总时延小于 2min，误码率小于 10-2；最大传输距离为 1.8m。关键词：BPSK 调制；基带编解码；DDS；相干解调；位同步AbstractThis paper presents a simple communication system using BPSK modulation. System by the sending and receiving ends of two parts.the sending end to STM32 as the control center , the received data baseband differential encoding , control direct digital frequency synthesis (Direct Digital Synthesis, DDS) of the AD9854 is BPSK modulation, amplified by the power amplifier transmitting the antenna out ; receiving end by quadrature demodulator chip MAX2451 an.Through the test, the system carrier is 36MHz; the total delay of 1Mbit data transmission is less than 2min, the bit error rate is less than 10-2; antenna length is less than 50cm, the transmission distance is greater than 1.5m.Key words: BPSK modulation ; baseband codec ; DDS; coherent demodulation ; bit synchronization目 录第一章 绪论....................................................................................................................................................11.1 课题的讨论背景................................................................................................................................
