摘要
QPSK调制方法以其具有频带利用率高、抗干扰能力强的优势,被广泛应用于卫星通讯数据传输,QPSK解调过程中产生相位模糊,导致误码率升高,通信性能急剧下降。为了解决上述问题,详细阐述差分编码的定义,提出8种结构相似的差分编码方式,明确了差分编码方法的多种表达形式;基于卫星通讯数据传输的相关特点,详细推导了QPSK解调产生相位模糊公式与基本原理,并分析了不同差分编码方式能够消除的相位模糊类型。对所提出差分编码方法进行仿真验证。Simulink仿真结果与理论分析相一致,验证了所提出方法的有效性。
The QPSK modulation method is widely used in satellite communication data transmission due to its such advantages as high frequency band utilization rate and strong anti-interference ability.However,phase ambiguity occurs during the QPSK demodulation process,leading to an increase in bit error rate and a sharp decline in communication performance.To address the aforementioned issues,firstly the definition of differential coding is elaborated in detail and eight kinds of similar differential coding methods in structure are proposed,several expression forms of differential coding methods are clarified.Secondly,based on the relevant characteristics of satellite communication data transmission,the formula and the basic principle of phase ambiguity generated by QPSK demodulation are derived in detail,and the types of phase ambiguity that can be eliminated by different differential coding methods are analyzed.Finally,the proposed differential coding method is simulated and verified.The Simulink simulation results are consistent with the theoretical analysis,the effectiveness of the proposed method is verified.
作者
简熠
卢欧欣
林华鹏
熊达福
古礼衍
JIAN Yi;LU Ouxin;LIN Huapeng;XIONG Dafu;GU Liyan(Southwest Institute of Electronic Technology of China,Chengdu 610036,China)
出处
《火力与指挥控制》
北大核心
2025年第5期97-102,110,共7页
Fire Control & Command Control
关键词
卫星通信
QPSK
差分编码
差分解码
相位模糊
satellite communication
QPSK
differential encoding
differential decoding
phase ambi-guity
