WO2013152542A1

WO2013152542A1 - Interference elimination method and device

Info

Publication number: WO2013152542A1
Application number: PCT/CN2012/075374
Authority: WO
Inventors: 佘海波; 梁攀峰; 刘凤鹏; 孙钦利; 郭帅
Original assignee: 中兴通讯股份有限公司
Priority date: 2012-04-11
Filing date: 2012-05-11
Publication date: 2013-10-17
Also published as: CN103379643A

Abstract

Disclosed are an interference elimination method and device, the method comprising: determining whether the multiple frequency of an interference source working frequency interferes with a system working frequency; if the multiple frequency of the interference source working frequency interferes with the system working frequency, then adjusting the interference source working frequency. The present invention solves the problem that the interference elimination method in the relevant art cannot satisfy the requirements, thus achieving the effects of better interference elimination and lower cost.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a method and apparatus for eliminating interference. BACKGROUND In a wireless communication device, a system often receives an interference signal from itself, especially in a mobile terminal, where the speed of the baseband signal is higher and higher, and the interference of the higher harmonics to the radio frequency module, especially the antenna, is increasingly many. For example, with the advancement of display technology of Liquid Crystal Display (LCD), the system interface has been improved from serial port and CPU interface to RGB, LVDS and MIPI interfaces. As the screen resolution increases, the LCD interface The clock frequency is constantly increasing, and the higher harmonics of the clock often fall within the communication bandwidth, causing interference. 1 is a schematic diagram of higher harmonics and radio frequency operating points of an interference source according to the related art. As shown in FIG. 1, the interference source is assumed to be a CLK signal of the LCD, and the interference operating frequency is fl, which is x, y, z times. The frequency just falls within the RF operating frequency of the system (x*fl in Figure 1 represents the X multiplier of fl, y*fl represents the Y multiplier of fl, and z*fl represents the Z multiplier of fl). If at some point, the system works within a certain distance of the frequency of fl *x, it will be interfered by the higher harmonics fl *x of CLK, resulting in system performance degradation or even failure. In order to reduce the interference of other devices in the system, the commonly used method is to reduce the interference by filtering and shielding as much as possible while improving the capability of the receiving system, such as filtering the clock at the interface or fully shielding the clock. In some cases, however, the elimination of interference requires an unacceptable price, and sometimes it is difficult to eliminate the interference. In view of the problem that the interference cancellation method in the related art cannot satisfy the demand, an effective solution has not been proposed yet. SUMMARY OF THE INVENTION Embodiments of the present invention provide a method and apparatus for eliminating interference, so as to at least solve the problem that the interference cancellation method in the related art cannot meet the requirement. According to an aspect of an embodiment of the present invention, a method for eliminating interference is provided, including: determining whether a frequency multiplication of an interference source operating frequency causes interference to an operating frequency of the system; and multiplying the frequency of the interference source operating frequency In the case where the operating frequency of the system causes interference, the operating frequency of the interference source is adjusted. Preferably, after adjusting the interference source operating frequency, the method further includes: detecting whether the operating frequency of the system changes; when the operating frequency of the system changes, re-determining the frequency multiplication of the interference source operating frequency to the system Does the operating frequency cause interference? Preferably, determining whether the frequency multiplication of the interference source operating frequency causes interference to the operating frequency of the system includes: determining whether a difference between the frequency multiplication of the interference source operating frequency and the operating frequency of the system is not greater than a preset Threshold; determining, in a case where a difference between a frequency multiplication of the interference source operating frequency and an operating frequency of the system is not greater than a preset threshold, determining a frequency multiplication of the interference source operating frequency to an operating frequency of the system Cause interference. Preferably, an operating frequency of at least two interference sources is preset, wherein a frequency multiplication of the operating frequencies of the at least two interference sources does not coincide with an operating frequency of the system, and adjusting the working frequency of the interference source includes : The interference source operating frequency is adjusted in the operating frequency of at least two sources of interference. Preferably, before determining whether the multiplication frequency of the interference source operating frequency causes interference to the operating frequency of the system, the method further includes: acquiring, by the baseband processor, an operating frequency of the system that the radio frequency module is using. Preferably, the interference source comprises at least one of the following: an LCD interface clock, a memory, a camera. According to another aspect of the present invention, an apparatus for eliminating interference is provided, including: a determining module, configured to determine whether a frequency multiplication of an operating frequency of an interference source causes interference to an operating frequency of the system; and an adjustment module is set to When the result of the judgment by the judgment module is that the frequency multiplication of the interference source operating frequency causes interference to the operating frequency of the system, the interference source operating frequency is adjusted. Preferably, the device further includes: a detecting module, configured to detect whether a working frequency of the system changes; when the operating frequency of the system changes, the determining module is further configured to re-determine the working frequency of the interference source Does the multiplier interfere with the operating frequency of the system? Preferably, the determining module includes: a second determining module, configured to determine whether a difference between a frequency multiplication of the interference source operating frequency and an operating frequency of the system is not greater than a preset threshold; determining a module, configured to Determining, by the second judging module, that the difference between the multiplication frequency of the interference source operating frequency and the operating frequency of the system is not greater than a preset threshold, determining a frequency multiplication pair of the interference source operating frequency The operating frequency of the system causes interference. Preferably, the device further comprises: an obtaining module, configured to acquire, by the baseband processor, an operating frequency of a system that the radio frequency module is using. According to the embodiment of the present invention, whether the frequency multiplication of the operating frequency of the interference source is used to cause interference to the operating frequency of the system; when the frequency multiplication of the working frequency of the interference source causes interference to the operating frequency of the system, the interference source is adjusted. working frequency. The problem that the interference cancellation method in the related art cannot meet the demand is solved, thereby achieving the effect of eliminating interference better and lowering cost. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a schematic diagram of higher harmonics and radio frequency operating points of an interference source according to the related art; FIG. 2 is a flow chart of a method for canceling interference according to an embodiment of the present invention; FIG. FIG. 4 is a block diagram showing a preferred structure of an apparatus for canceling interference according to an embodiment of the present invention; FIG. 5 is a block diagram showing a preferred structure of a judging module of apparatus for eliminating interference according to an embodiment of the present invention; 6 is a block diagram of a preferred structure of an apparatus for canceling interference according to an embodiment of the present invention; FIG. 7 is a schematic diagram showing the influence of an interference source higher harmonic on an RF operating frequency band after transforming an operating frequency of an interference source according to a preferred embodiment of the present invention; 8 is a flow chart of interference frequency adjustment at a single radio frequency operating frequency point according to a preferred embodiment of the present invention; and FIG. 9 is an interference working frequency point adjustment during radio frequency operation frequency hopping according to a preferred embodiment 3 of the present invention. Flow chart. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The present embodiment provides a method for eliminating interference. FIG. 2 is a flowchart of a method for eliminating interference according to an embodiment of the present invention. As shown in FIG. 2, the method includes the following steps: Step S202: determining an operating frequency of an interference source Does the frequency multiplier interfere with the operating frequency of the system; Step S204: Adjust the interference source operating frequency when the frequency multiplication of the interference source operating frequency causes interference to the operating frequency of the system. In the embodiment, when it is determined that the frequency multiplication of the interference source operating frequency causes interference to the operating frequency of the system, the interference is eliminated by adjusting the working frequency of the interference source, and the filtering is performed compared to the related technology. Shielding and other means to reduce the interference, because the interference frequency of the interference source itself is adjusted to eliminate interference, which can eliminate some interference that cannot be eliminated by filtering, shielding, etc.; and since it is not necessary to add components such as filter shielding, The cost of eliminating interference is even lower. Of course, this solution can also be used together with filtering, shielding, etc. to reduce interference and achieve better interference cancellation effects. The problem that the interference cancellation method in the related art cannot meet the demand is solved. As a preferred implementation manner, it is also possible to detect whether the operating frequency of the system changes after step S204, and if a change occurs, the step of step S202 may be re-executed. In this way, when the operating frequency of the system changes, the interference can also be eliminated, the flexibility of the solution is improved, and the scope of application is expanded. There are many ways to determine whether the frequency multiplication of the interference source's operating frequency causes interference to the operating frequency of the system. When the frequency multiplication of the interference source operating frequency is within a certain range of the operating frequency of the system, the frequency multiplication of the interference source operating frequency can be determined. It will interfere with the operating frequency of the system. As a preferred implementation manner, the threshold may be preset, and the absolute value of the difference between the frequency multiplication of the interference source operating frequency and the operating frequency of the system (or the difference between the operating frequency of the system and the frequency multiplication of the interference source operating frequency) may be determined. If it is not greater than the preset threshold value, it can be determined that the frequency multiplication of the interference source operating frequency causes interference to the operating frequency of the system. This method is operability and easy to implement. There are many ways to adjust the operating frequency of the interference source in step S204. For example, the adjustment may be performed in a certain interval sequence within an optional working range of the interference source operating frequency. As a preferred embodiment, at least two working frequencies of the interference source may be preset in an optional working range of the interference source operating frequency, wherein the frequency multiplications of the operating frequencies of the set interference sources do not coincide with The system operating frequency, so that when the interference source operating frequency is adjusted, the current interference source operating frequency can be adjusted in the operating frequencies of the at least two interference sources. Adjustments are made in this way, the adjustment speed is fast, the system works efficiently, and the occurrence of interference is reduced. For example, the operating frequency of the interference source can be set to n, and n 2, n can be set according to actual conditions. The higher harmonics of the set n frequencies do not completely coincide. Therefore, when the high-order harmonic of the first operating frequency generates interference, the second operating frequency is used, and if there is interference, the third operating frequency is enabled, and so on. In the RF system, since the operating frequency of the RF system is divided into multiple operating frequency bands, the general frequency is in the higher frequency range such as 800MHz and 1.9GHz, and the baseband signal operating frequency is generally below 100MHz. The interference can come from the baseband signal edge. The higher harmonics, therefore, their interference is reflected in some specific frequencies. If you change the operating frequency of the interfering signal, its higher harmonic interference will also change. Preferably, it can be processed by baseband The device obtains the communication frequency band that the RF module is using as the system operating frequency. Using this method to obtain the operating frequency of the system is easy to operate and achievable. By comparing the operating frequency of the system with the higher harmonic frequency of the interference source, if the two frequencies are close, and there is interference, the frequency of the interference source is adjusted to avoid the operating frequency band. Preferably, the solution can be used to eliminate interference of multiple interference sources, thereby increasing the scope of application of the solution. For example, the above interference source may be an LCD interface clock, a memory (FLASH), a camera, or the like. In the embodiment, a device for eliminating interference is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments, and has not been described again. As used hereinafter, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and conceivable. FIG. 3 is a structural block diagram of an apparatus for canceling interference according to an embodiment of the present invention. As shown in FIG. 3, the apparatus includes a judging module 32 and an adjusting module 34. Each module will be described in detail below. The determining module 32 is configured to determine whether the multiplication frequency of the working frequency of the interference source causes interference to the operating frequency of the system; the adjusting module 34 is connected to the determining module 32, and is set to be a multiplication frequency of the working frequency of the interference source in the determining result of the determining module 32. In the case of interference to the operating frequency of the system, adjust the operating frequency of the interferer. 4 is a block diagram of a preferred structure of an apparatus for eliminating interference according to an embodiment of the present invention. As shown in FIG. 4, the apparatus may further include: a detecting module 42 connected to the determining module 32, configured to detect whether the operating frequency of the system changes. When the operating frequency of the system changes, the determining module 32 may also be configured to re-determine whether the multiplication frequency of the operating frequency of the interference source causes interference to the operating frequency of the system. FIG. 5 is a block diagram showing a preferred structure of the determining module 32 of the apparatus for eliminating interference according to an embodiment of the present invention, as shown in FIG.

As shown in FIG. 5, the determining module 32 may include: a second determining module 322, configured to determine whether a difference between the multiplication frequency of the interference source operating frequency and the operating frequency of the system is not greater than a preset threshold; the determining module 324, and the second The determining module 322 is connected, and is configured to determine the frequency multiplication of the working frequency of the interference source if the result of the second determining module 322 is that the frequency difference between the operating frequency of the interference source and the operating frequency of the system is not greater than a preset threshold. Interference with the operating frequency of the system. FIG. 6 is a block diagram of a preferred structure of an apparatus for eliminating interference according to an embodiment of the present invention. As shown in FIG. 6, the apparatus may further include: an obtaining module 62, connected to the determining module 32, configured to acquire a radio frequency module by using a baseband processor. The communication frequency being used as the system operating frequency. The following description is made in conjunction with the preferred embodiments, which are combined with the above-described embodiments and preferred embodiments thereof. In the following preferred embodiments, the interference elimination in the radio frequency system is taken as an example. In order to solve the interference of other devices in the system on the radio frequency module and the antenna, a radio frequency interference cancellation method for the wireless communication system is provided, and the method passes the interference. Source frequency control to resolve the interference of higher harmonics of the interference source frequency to the operating band of the RF system. Preferred Embodiment 1 FIG. 7 is a schematic diagram showing the influence of the interference source higher harmonics on the radio frequency working frequency band after transforming the operating frequency of the interference source according to the preferred embodiment of the present invention. As shown in FIG. 7, the interference source is assumed to be the CLK signal of the LCD. The frequency can be selected from 35MHz to 40MHz. The higher harmonics have interference in the RF operating band. For example, the CLK signal can be operated at 38.4MHz (fl) and 35.5Mhz (£2). If the CLK signal operates at 38.4MHz, its 23 (X) multiplier has interference at 883.2MHz (fl*x), 41 (y) multiplier has interference at 1574.4Mhz (fl*y), 51 (z) multiplier at 1958.45MHz (fl*z) interference; if the CLK signal operates at 35.5MHz (£2), its 25 (a) multiplier has interference at 887MHz, 45 (b) multiplier has interference at 1575Mhz, 55 (c) times There is interference at 1952.5MHz (£2*c). Therefore, the higher harmonics of the selected two operating frequencies do not coincide in the RF operating band. (In Figure 7, x*fl represents the X multiplier of fl, y*fl represents the Y multiplier of fl, z*fl represents the Z multiplier of fl, x*£2 represents the X multiplier of £2, y*£2 Y times the frequency of £2, z*£2 represents the Z frequency multiplication of £2) Preferred Embodiment 2 FIG. 8 is a flow chart of the interference frequency adjustment at the single radio frequency operating frequency point according to the preferred embodiment 2 of the present invention. If the communication terminal works at a single working frequency point, as shown in FIG. 8, the process of the interference working frequency point adjustment includes the following steps: Step S802, start establishing communication. Step S804, the communication terminal acquires a communication working frequency point by using a protocol. Step S806, comparing the RF working frequency with the CLK multiplication of the LCD. If the operating frequency at this time is 883.2Mhz, and the CLK of the LCD is at 38.4MHz (fl), that is, the 23 times of the CLK is just at the operating frequency (fl*x), then the process proceeds to step S808; if the LCD is working at this time At 35.5 MHz (£2), the process proceeds to step S810. In step S808, the terminal processor directly adjusts the CLK of the LCD to 35.5 MHz (£2), thereby avoiding the CLK multiplication interference of the LCD. In step S810, the call ends. Preferred Embodiment 3 FIG. 9 is a flowchart of adjusting an interference working frequency point during radio frequency operation frequency hopping according to a preferred embodiment 3 of the present invention. If the radio frequency operating frequency of the communication terminal frequently jumps, as shown in FIG. The process of disturbing the working frequency adjustment includes the following steps: Step S902, start establishing communication. Step S904, the communication terminal acquires a communication working frequency point by using a protocol. Step S906, comparing the RF working frequency with the CLK multiplication of the LCD. If the operating frequency at this time is 883.2 Mhz, and the CLK of the LCD is at 38.4 MHz (fl), that is, the 23 times of the CLK is just at the operating frequency (fl*x), then the process proceeds to step S908; if the LCD is working at this time 35.5MHz (£2), no processing is required, and the process proceeds to step S904 to obtain the communication working frequency point in real time. Step S908, the terminal processor directly adjusts the CLK of the LCD to 35.5 MHz (£2), thereby avoiding the CLK multiplication interference of the LCD, and proceeds to step S904 to obtain the communication working frequency point in real time. From the above description, it can be seen that, in this embodiment, when it is determined that the frequency multiplication of the interference source operating frequency interferes with the operating frequency of the system, the interference is eliminated by adjusting the working frequency of the interference source. Compared with related technologies, filtering and shielding are used to reduce interference. Since the interference frequency is adjusted to eliminate interference, it can eliminate some interference that cannot be eliminated by filtering, shielding, etc. Filtering shields and other components, so the cost of eliminating interference is much lower. Of course, this solution can also be used together with filtering, shielding, etc. to reduce interference and achieve better interference cancellation effects. In another embodiment, software is also provided for performing the technical solutions described in the above embodiments and preferred embodiments. In another embodiment, a storage medium is also provided, the software being stored, including but not limited to an optical disk, a floppy disk, a hard disk, a rewritable memory, and the like. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. Perform the steps shown or described, or separate them into individual integrated circuit modules, or Multiple of these modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

1. A method of eliminating interference, including:

Determining whether the frequency multiplication of the interference source operating frequency causes interference to the operating frequency of the system; and adjusting the operating frequency of the interference source in the case where the frequency multiplication of the interference source operating frequency causes interference to the operating frequency of the system.

The method according to claim 1, wherein after adjusting the working frequency of the interference source, the method further includes:

Detecting whether the operating frequency of the system changes;

When the operating frequency of the system changes, it is re-determined whether the multiplication frequency of the interference source operating frequency interferes with the operating frequency of the system.

The method according to claim 1 or 2, wherein determining whether the multiplication frequency of the interference source operating frequency causes interference to the operating frequency of the system comprises:

Determining whether a difference between a frequency multiplication of the interference source operating frequency and an operating frequency of the system is not greater than a preset threshold;

In case the difference between the frequency multiplication of the interference source operating frequency and the operating frequency of the system is not greater than a preset threshold, determining that the frequency multiplication of the interference source operating frequency interferes with the operating frequency of the system.

4. The method according to claim 1, wherein an operating frequency of at least two interference sources is preset, wherein a frequency multiplication of the operating frequencies of the at least two interference sources does not coincide with the operation of the system Frequency, adjusting the interference source operating frequency comprises: adjusting the interference source operating frequency in an operating frequency of at least two interference sources.

The method according to claim 1, wherein before determining whether the multiplication frequency of the interference source operating frequency causes interference to the working frequency of the system, the method further includes:

The operating frequency of the system in which the RF module is being used is obtained by the baseband processor.

The method according to any one of claims 1, 2, 4, or 5, wherein the interference source comprises at least one of the following: a liquid crystal display LCD interface clock, a memory, a camera.

7. A device for eliminating interference, comprising: The judging module is configured to determine whether the multiplication frequency of the working frequency of the interference source causes interference to the operating frequency of the system;

The adjusting module is configured to adjust the working frequency of the interference source if the result of the determining by the determining module is that the frequency multiplication of the operating frequency of the interference source causes interference to the operating frequency of the system. The device according to claim 7, wherein the device further comprises: a detecting module configured to detect whether a working frequency of the system changes;

When the operating frequency of the system changes, the determining module is further configured to re-determine whether the frequency multiplication of the operating frequency of the interference source causes interference to the operating frequency of the system. The device according to claim 7 or 8, wherein the determining module comprises: a second determining module, configured to determine whether a difference between a frequency multiplication of the interference source operating frequency and an operating frequency of the system is not greater than a pre-determination Set threshold;

a determining module, configured to determine, in a case that the result of the second determining module is that the frequency multiplication of the interference source operating frequency and the operating frequency of the system are not greater than a preset threshold, determining the interference source The frequency multiplication of the operating frequency interferes with the operating frequency of the system. The device according to claim 7 or 8, wherein the device further comprises: an obtaining module, configured to acquire, by the baseband processor, a working frequency of a system that the radio frequency module is using