Method for restraining frequency deviation exceeding and mobile terminal

A mobile terminal, first-time technology, applied in the transmitter/receiver shaping network, electrical components, baseband system components, etc., can solve the problem of deteriorating AFC steady-state performance, mobile terminal frequency deviation range, etc.

Active Publication Date: 2012-11-07
HONOR DEVICE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, increasing the bandwidth of the AFC loop filter increases the tracking speed of AFC, but at the same time, it will deteriorate the steady-state performance of AFC—the frequency deviation range of mobile terminals after long-term tracking of AFC

Method used

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  • Method for restraining frequency deviation exceeding and mobile terminal
  • Method for restraining frequency deviation exceeding and mobile terminal
  • Method for restraining frequency deviation exceeding and mobile terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] figure 1 It is a schematic diagram of a mobile terminal for adaptively adjusting the bandwidth of an AFC loop filter according to Embodiment 1 of the present invention. Such as figure 1 As shown, the mobile terminal includes a detection unit 100 and a bandwidth control unit 102 . Wherein the detection unit 100 is used to detect whether the mobile terminal accesses the base station with the maximum power or whether the transmission power increase value of the adjacent time slot of the power amplifier of the mobile terminal exceeds a preset threshold; the bandwidth control unit 102 is used for if the mobile terminal The transmission power increase value of the adjacent time slot of the power access base station or mobile terminal power amplifier exceeds a preset threshold, and the bandwidth of the automatic frequency offset control AFC loop filter is adjusted from the first bandwidth to the second bandwidth; after the first After a period of time, the bandwidth of the A...

Embodiment 2

[0019] figure 2 It is a flowchart of a method for adaptively adjusting the bandwidth of an AFC loop filter according to Embodiment 2 of the present invention. figure 2 The specific workflow of the program is as follows:

[0020] Step 200, detect whether the PA of the mobile terminal accesses the base station with the maximum power, if yes, enter step 202, increase the AFC loop filter bandwidth f_AFC from the initial value f0 to a new value f1, and start a timer at the same time, enter Step 204, judge whether the timer is reset, if not reset, wait for the timer reset, enter step 204 again, if the timer reset, enter step 206, the AFC loop filter bandwidth is transferred back to the AFC loop filter bandwidth initial value f0 .

[0021] figure 2 Among them, f0 and f1 respectively represent the value of the loop filter bandwidth f_AFC under different conditions, and f1>f0, T is the step size of the timer. There is no specific limit on how much f1 is to be chosen. In actual o...

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Abstract

The invention provides a method for restraining frequency deviation exceeding and a mobile terminal. The mobile terminal comprises a detection unit and a bandwidth control unit, wherein the detection unit is used for detecting whether the mobile terminal accesses a base station at a maximum power or not or whether the added value of the transmitted power of adjacent slots of a mobile terminal power amplifier exceeds a preset threshold value or not, if yes, the bandwidth control unit is used for adjusting the bandwidth of an AFC (Automatic Frequency Control) loop filter from a first bandwidth to a second bandwidth and then adjusting the bandwidth from the second bandwidth to the first bandwidth after a while, and the second bandwidth is larger than the first bandwidth. According to the embodiment of the invention, the tracking of the AFC is accelerated through widening the bandwidth of the AFC loop filter, and then the bandwidth is returned at an appropriate time so as to ensure the steady-state performance of the AFC.

Description

technical field [0001] The invention relates to a mobile communication system, in particular to a method and a mobile terminal for suppressing excessive frequency deviation. Background technique [0002] Time division multiple access (TDMA) technology is often used in mobile communication systems to distinguish different mobile terminals with different time slots. Therefore, it is very important to maintain frequency synchronization between the mobile terminal and the base station, because the clock of the mobile terminal is not synchronized with the clock of the base station. The mobile terminal cannot communicate with the base station. The base station performs normal communication. The clock of the mobile terminal and the clock of the base station are respectively provided by the crystal oscillator of the mobile terminal and the crystal oscillator of the base station. In the GSM system, there is a public broadcast control channel, which contains frequency correction info...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04W24/00H04W88/02
Inventor 胡伯承杨靖吴更石
Owner HONOR DEVICE CO LTD
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