摘要
介绍了一种适用于大载波频偏的MSK数字解调器,基于同步-频偏校正联合算法实现,利用归一化处理,解决信号幅度不稳的问题;通过Matlab仿真,确定了电路结构和各模块参数。该解调器性能良好,误码率可达到10-3@Eb/N0=9,同时能够适应较高的载波频偏,在5×10-4的收发机频偏影响下,解调性能仅比无频偏时下降0.4dB。MSK解调器的硬件电路已通过FPGA验证,并应用于内窥镜胶囊体外便携式基站中。
A digital MSK demodulator for high carrier frequency offset was presented.This demodulator was based on joint synchronization and frequency offset compensation algorithm,including normalization circuit for signal amplitude stability.System architecture and parameters of each module were defined with simulation.The demodulator had a BER of 10^-3@ Eb/N0=9 ideally.When affected by a 5×10^-4 frequency-offset,performance was 0.4 dB lower than ideal situation.The MSK demodulator was verified on FPGA,and applied in portable base station for endoscopic capsule.
出处
《微电子学》
CAS
CSCD
北大核心
2011年第6期810-814,共5页
Microelectronics
基金
国家高技术研究发展(863)计划基金资助项目(2008AA010708)
关键词
MSK
载波频偏
数字解调器
便携式基站
MSK
Carrier frequency offset
Digital demodulator
Portable base station
