But both of them are sensitive to carrierfrequencyshift, further, they have comparative BER under AWGN and Doppler shift environment.
但两者都对载波频率偏移敏感，且在AWGN和多普勒频移环境下表现相当。
2
A form of frequency modulation in which the carrierfrequency is shifted between a mark frequency and a space frequency in response to the impressed intelligence signal (frequency-shift keying).
频率调制的一种方式，其中载波频率在标志频率和场频率之间移动，以响应外加的情报(数据)信号。
3
About GPS receiver, the research importance is high-dynamic receiver. The key is to solve the Doppler frequencyshift caused by the high-speed movement of carrier.