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 MSK digital demodulator suitable for large carrier frequency offset is introduced, which is based on the joint algorithm of synchronization and frequency offset correction. The normalization process is adopted to solve the problem of signal amplitude instability. By Matlab simulation, the circuit structure and Each module parameter. The demodulator with good performance, bit error rate of 10-3 @ Eb / N0 = 9, while being able to adapt to higher carrier frequency offset in the 5 × 10-4 transceiver frequency offset, the demodulation performance only 0.4dB lower than non-frequency deviation. The hardware circuit of MSK demodulator has already passed FPGA verification, and used in endoscopic capsule in vitro portable base station.