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Signal demodulation method and device

A signal demodulation, radio frequency signal technology, applied in the field of mobile terminal development, can solve problems such as slow communication rate

Active Publication Date: 2013-08-28
XIAOMI INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The embodiment of the present invention provides a signal demodulation method and device to solve the problem that the communication rate is too slow when there is a Doppler frequency shift

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  • Signal demodulation method and device

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Embodiment Construction

[0034] Embodiments of the present invention provide a signal demodulation method and device to reduce the influence of Doppler frequency shift on communication rate. When demodulating the received radio frequency signal sent by the base station, after obtaining the reference clock signal provided by the PMU, it is also necessary to determine the moving speed of the mobile terminal, and determine the mobile terminal according to the moving speed when it receives the radio frequency signal transmitted by the base station. The Doppler frequency offset value, and then demodulates the received radio frequency signal sent by the base station according to the reference clock signal and the Doppler frequency offset value. Because the influence of Doppler frequency offset is considered when demodulating the radio frequency signal sent by the base station, the demodulation accuracy is high, thus avoiding the reduction of modulation accuracy and the slow communication rate when there is a...

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Abstract

The invention provides a signal demodulation method and device so as to reduce the influence of Doppler frequency shift on transmission speed. When received radio-frequency signals sent by a base station are demodulated, reference clock signals provided by a PMU are obtained, then the movement speed of a mobile terminal needs to be determined, a Doppler frequency offset value generated when the mobile terminal receives the radio-frequency signals transmitted by the base station is determined according to the movement speed, and then the received radio-frequency signals sent by the base station are demodulated according to the reference clock signals and the Doppler frequency offset value. Due to the fact that the influence of Doppler frequency offset is considered when the radio-frequency signals sent by the base station are demodulated, demodulation precision is high, and therefore the problem that the transmission speed is too low when the Doppler frequency offset exists is solved.

Description

technical field [0001] The invention relates to mobile terminal development technology, in particular to a signal demodulation method and device. Background technique [0002] The communication rate has always been valued by users, but when the user is in a mobile state, due to the existence of the Doppler effect, a Doppler frequency shift will occur. When the mobile speed of the user is fast, there will be a large Doppler frequency shift when the mobile terminal receives the signal sent by the base station, that is, the difference between the frequency of the received signal and the frequency of the signal actually sent by the base station, That is, the Doppler frequency deviation value is large, which affects the accuracy of radio frequency demodulation of the communication system and the data throughput rate of communication with the base station. resulting in slower communication rates. [0003] Taking the Wideband Code Division Multiple Access (WCDMA) mobile communica...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04W28/22
CPCH04L27/0014H04L2027/0036H04L2027/0046H04L2027/0083H04W4/027H04W56/0035G01S11/10G01S19/52
Inventor 王向东吴正海郭峰
Owner XIAOMI INC
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