移动卫星突发通信全数字接收机设计  

An All-digital Receiver for Mobile Satellite Burst Communication

作　　者：陈寅健[1] 李荔[1] 李国通[1] 梁旭文[1] 杨根庆[1] 

机构地区：[1]中国科学院上海小卫星工程部,上海200050

出　　处：《应用科学学报》2001年第1期20-23,共4页Journal of Applied Sciences

摘　　要：移动卫星突发通信具有通信速率低、频率偏移大、频率变化快、突发帧短等特点 ,常规的解调器不能满足要求 ,文中提出了一种新的基于 FFT频率捕获和非相干检测的 DPSK/ DQPSK全数字解调器结构 .仿真结果表明 ,该解调器具有频率捕获范围宽、频率捕获时间短等特点 。Mobile satellite burst communication operates under severe noise conditions, large Doppler offset, fast Doppler frequency shifts, and multi path fading, so synchronization in receiver becomes very difficult, especially when the burst frame is too short. This paper proposes a new all digital receiver structure, which relies on FFT based burst acquisition and noncoherent detection. Simulation results demonstrate that the receiver can work under large frequency offset and have short acquisition time, so that can be used in mobile satellite burst communication.

关 键 词：移动卫星通信 多普勒频偏 快速傅里叶变换 非相干检测 频率捕获 解调器 全数字接收机 

分 类 号：TN927.23[电子电信—通信与信息系统] TN763.2[电子电信—信息与通信工程]