System, mobile terminal and method capable of correcting Doppler effect
A Doppler effect, mobile terminal technology, applied in the field of mobile terminals, can solve the problems of large investment, inability to cover all aspects of communication networks, impossible to achieve call quality, etc., to achieve the effect of simple implementation and reduced dependence.
Active Publication Date: 2019-06-18
SHENZHEN FUTAIHONG PRECISION IND CO LTD +1
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Problems solved by technology
However, the construction cycle of wireless network optimization is long and the investment is large. Due to various geographical reasons, many places along the high-speed rail cannot set up communication base stations, so that the coverage of the communication network cannot be exhaustive. Therefore, only by optimizing the wireless network facilities of high-speed rail Impossible to achieve call quality at rest or at low speeds
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[0021] Please refer to figure 1 As shown, it is a functional block diagram of a mobile terminal 200 operated by a system 100 capable of correcting Doppler effect according to the present invention. The mobile terminal 200 includes a processing unit 10 , a storage unit 20 , a voltage-controlled oscillation circuit 30 , a GPS unit 40 and a communication unit 50 . The GPS unit 40 is used to detect the moving speed of the mobile terminal 200 relative to the communication base station 300 . The communication unit 50 is used for communicating with at least one communication base station 300, so as to connect the mobile terminal 200 to a mobile network. The storage unit 20 stores the system 100, and the processing unit 10 is used to invoke and execute the system 100 stored in the storage unit. In other embodiments, the system 100 is a program solidified in the processing unit 10 . Wherein, the voltage-controlled oscillator circuit 30 is used for generating a local oscillator frequ...
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The invention provides a system, a mobile terminal and a method capable of correcting Doppler effect. The system runs in the environment framework of the mobile terminal and a communication base station. The system includes a detection module, a judgment module and an adjustment module. The detection module is used to detect the signal strength sent by the communication base station to the mobile terminal in real time, and determine the change trend of the detected signal strength, and the judgment module is used to compare the acquired speed of the mobile terminal with a threshold The processing module is used to control the processing unit to generate a PWM voltage signal corresponding to the mobile terminal’s moving speed relative to the communication base station and the signal strength variation trend, and control the processing unit to send the generated PWM voltage signal to the mobile terminal’s On the voltage controlled oscillator circuit. The implementation method of the invention is simple, can realize the compensation of the Doppler frequency offset effect of mobile terminals such as mobile phones, and reduces the dependence on the communication network.
Description
technical field [0001] The present invention relates to the field of mobile communication, in particular to a system, mobile terminal and method for automatically correcting Doppler effect based on GPS (Global Positioning System). Background technique [0002] With the popularization of high-speed rail with a speed of more than 300 kilometers per hour, my country's rail transit has entered the high-speed era. While high-speed rail brings convenience and speed to people, it also brings great challenges to the planning and construction of mobile communication networks. An important issue in mobile communication network coverage is that users are moving at high speed, and the Doppler effect is very obvious. Here, the Doppler effect refers to the carrier frequency of the signal received by the receiver due to the relative motion between the signal source and the receiver. Changes, that is, frequency offsets are generated, and the optimization of the network is mainly to overcom...
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IPC IPC(8): H04B7/01H04M1/21H04M1/725H04M1/72454
Inventor 董行
Owner SHENZHEN FUTAIHONG PRECISION IND CO LTD