公开(公告)号：EP3001621B1

公开(公告)日：2018-03-21

申请号：EP14800268.6

申请日：2014-04-29

申请人： Xiaomi Inc.

发明人： WANG, Xiangdong ,  WU, Zhenghai ,  GUO, Feng

IPC分类号： H04L25/02 ,  H04L27/00

CPC分类号： H04W4/027 ,  G01S11/10 ,  G01S19/52 ,  H04L27/0014 ,  H04L2027/0036 ,  H04L2027/0046 ,  H04L2027/0083 ,  H04W56/0035

摘要： Provided are a signal demodulation method and device, so as to reduce the influence of Doppler frequency shift on the communication rate. When a received radio-frequency signal transmitted by a base station is demodulated, after a reference clock signal provided by a PMU is acquired, it is also required to determine a moving speed of a mobile terminal and determine a Doppler frequency offset value generated when the mobile terminal receives the radio-frequency signal transmitted by the base station according to the moving speed, and then the received radio-frequency signal transmitted by the base station is demodulated according to the reference clock signal and the Doppler frequency offset values. Since the influence of Doppler frequency offset is taken into account when a radio-frequency signal transmitted by a base station is demodulated, the demodulation accuracy is very high, thereby avoiding the problem of too slow a communication rate when Doppler frequency shift exists.

公开(公告)号：EP3001621A1

公开(公告)日：2016-03-30

申请号：EP14800268.6

申请日：2014-04-29

申请人： Xiaomi Inc.

发明人： WANG, Xiangdong ,  WU, Zhenghai ,  GUO, Feng

IPC分类号： H04L25/02

CPC分类号： H04W4/027 ,  G01S11/10 ,  G01S19/52 ,  H04L27/0014 ,  H04L2027/0036 ,  H04L2027/0046 ,  H04L2027/0083 ,  H04W56/0035

摘要： Provided are a signal demodulation method and device, so as to reduce the influence of Doppler frequency shift on the communication rate. When a received radio-frequency signal transmitted by a base station is demodulated, after a reference clock signal provided by a PMU is acquired, it is also required to determine a moving speed of a mobile terminal and determine a Doppler frequency offset value generated when the mobile terminal receives the radio-frequency signal transmitted by the base station according to the moving speed, and then the received radio-frequency signal transmitted by the base station is demodulated according to the reference clock signal and the Doppler frequency offset values. Since the influence of Doppler frequency offset is taken into account when a radio-frequency signal transmitted by a base station is demodulated, the demodulation accuracy is very high, thereby avoiding the problem of too slow a communication rate when Doppler frequency shift exists.