CN104469819A - Interference processing method and device - Google Patents

Abstract

The invention discloses a method and a device for processing interference. The method comprises the following steps of determining isolation between a wifi system and a time division-synchronization code division multiple access TD-SCDMA system; and determining transmitting power of a wifi signal according to the isolation, a maximum interference limit value of the TD-SCDMA system and a minimum attenuation value of a TD-SCDMA system filter about a 2.4G signal. By adopting the method and the device, the interference of the wifi signal with the TD-SCDMA signal can be avoided when Mifi equipment is integrated with a TD-SCDMA chip and a wifi chip.

Description

Interference processing method and device

technical field

The present invention relates to the technical field of wireless signal processing, in particular to an interference processing method and device.

Background technique

The MiFi is a portable broadband wireless device about the size of a credit card that functions as a modem, router and access point all in one. The built-in modem provides access to a wireless signal, and the internal router shares the connection among multiple users and wireless devices (up to 5 wireless devices can be supported). On the one hand, it acts as a receiver to receive HSDPA (High Speed Downlink Packet Access) data signals of TD-SCDMA (Time Division Synchronized Code Division Multiple Access, Time Division Synchronized Code Division Multiple Access), on the other hand As a wifi access point, it provides Internet service for connected devices.

However, because the Mifi device integrates the TD-SCDMA chip and the wifi chip, the two chip systems will interfere with each other, especially the interference of the wifi signal to the TD-SCDMA signal is more serious.

Contents of the invention

The embodiment of the present invention provides an interference processing method to solve the interference problem of wifi signals on TD-SCDMA signals on Mifi hotspot application equipment. The method includes:

Determine the isolation between the wifi system and the time division synchronous code division multiple access TD-SCDMA system;

According to the isolation degree, the maximum interference limit of the TD-SCDMA system and the minimum attenuation value of the TD-SCDMA system filter to the 2.4G signal, determine the wifi signal transmission power.

In one embodiment, the wifi signal transmission power is determined according to the isolation degree, the maximum interference limit of the TD-SCDMA system and the minimum attenuation value of the TD-SCDMA system filter to the 2.4G signal, including:

Determine the wifi signal transmission power according to the following formula:

P-X-Y<Z;

Among them, P is the wifi signal transmission power, X is the minimum attenuation value of the TD-SCDMA system filter to the 2.4G signal, Y is the isolation, and Z is the maximum interference limit of the TD-SCDMA system.

In one embodiment, the minimum attenuation value of the TD-SCDMA system filter for 2.4G signals is 29dB.

In one embodiment, the maximum interference limit of the TD-SCDMA system is: the maximum limit of the spurious signal power of the receiver of the TD-SCDMA terminal on the corresponding frequency point of 2.4 GHz.

In one embodiment, the maximum interference limit of the TD-SCDMA system is -49dBm.

In one embodiment, when the determined maximum transmission power limit of the wifi signal is greater than 20 dBm, 20 dBm is selected as the maximum transmission power of the wifi signal.

The embodiment of the present invention also provides an interference processing device to solve the problem of interference of wifi signals on TD-SCDMA signals on Mifi hotspot application equipment. The device includes:

The isolation degree determination module is used to determine the isolation degree between the wifi system and the time division synchronous code division multiple access TD-SCDMA system;

The transmission power determination module is used to determine the wifi signal transmission power according to the isolation, the maximum interference limit of the TD-SCDMA system and the minimum attenuation value of the TD-SCDMA system filter to the 2.4G signal.

In one embodiment, the transmission power determination module is specifically used for:

Determine the wifi signal transmission power according to the following formula:

P-X-Y<Z;

Among them, P is the wifi signal transmission power, X is the minimum attenuation value of the TD-SCDMA system filter to the 2.4G signal, Y is the isolation, and Z is the maximum interference limit of the TD-SCDMA system.

In an embodiment, the interference processing device further includes:

The attenuation value determination module is used to determine the minimum attenuation value of the TD-SCDMA system filter for 2.4G signals is 29dB.

In an embodiment, the interference processing device further includes:

The interference limit determination module is used to determine the maximum interference limit of the TD-SCDMA system: the maximum limit of the spurious signal power of the TD-SCDMA terminal receiver spurious at the corresponding frequency point of 2.4GHz.

In one embodiment, the interference limit determination module is specifically configured to determine the maximum interference limit of the TD-SCDMA system as -49dBm.

In one embodiment, the transmit power determining unit is specifically configured to select 20 dBm as the maximum transmit power of the wifi signal when the determined maximum limit of the transmit power of the wifi signal is greater than 20 dBm.

In the embodiment of the present invention, determine the degree of isolation between the wifi system and the TD-SCDMA system; according to the degree of isolation, the maximum interference limit of the TD-SCDMA system and the TD-SCDMA system filter For the minimum attenuation value of the 2.4G signal, determine the wifi signal transmission power; it can avoid the interference of the wifi signal to the TD-SCDMA signal when the Mifi device integrates the TD-SCDMA chip and the wifi chip.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort. In the attached picture:

FIG. 1 is a schematic diagram of a processing flow of an interference processing method in an embodiment of the present invention;

Fig. 2 is a schematic diagram of WLAN (Wireless Local Area Network, wireless local area network) channel and frequency point distribution in the embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an interference processing device in an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a specific example of an interference processing device in an embodiment of the present invention;

Fig. 5 is a schematic structural diagram of a specific example of an interference processing device in an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

The inventor considers that when the wifi signal is coupled to the TD-SCDMA system receiver through the antenna of the TD-SCDMA system, interference spurious signals will be generated. If the strength of the interference spurious signals exceeds the maximum interference limit of the TD-SCDMA system, It will cause serious interference to the TD-SCMA system; according to the European standard EIRP (Equivalent Isotropic Radiated Power, Equivalent Isotropic Radiated Power) standard, the maximum transmission power of wifi signals shall not exceed 100mW, that is, 20dBm; this standard only specifies the Maximum transmit power. Based on this, in the embodiment of the present invention, in the case of ensuring a certain wifi coverage, by appropriately reducing the wifi signal transmission power, the power of the interference spurious signal coupled to the receiving end of the TD-SCDMA system can be reduced until it meets the industry standard Requirements to solve the interference problem of wifi signal on TD-SCDMA signal on Mifi hotspot application equipment.

Fig. 1 is a processing flowchart of the interference processing method in the embodiment of the present invention. As shown in Fig. 1, the interference processing method in the embodiment of the present invention may include:

Step 101, determine the degree of isolation between the wifi system and the time division synchronous code division multiple access TD-SCDMA system;

Step 102: Determine the wifi signal transmission power according to the isolation degree, the maximum interference limit of the TD-SCDMA system, and the minimum attenuation value of the 2.4G signal by the filter of the TD-SCDMA system.

As can be known from the process shown in Figure 1, in the embodiment of the present invention, determine the degree of isolation between the wifi system and the TD-SCDMA system; according to the degree of isolation, the interference of the TD-SCDMA system The maximum limit value and the minimum attenuation value of the TD-SCDMA system filter to the 2.4G signal determine the wifi signal transmission power; it can avoid the interference of the wifi signal to the TD-SCDMA signal when the Mifi device integrates the TD-SCDMA chip and the wifi chip.

During specific implementation, the isolation between the wifi system and the TD-SCDMA system can be determined by measurement; according to the isolation between the wifi system and the TD-SCDMA system, the maximum interference limit of the TD-SCDMA system, and the TD-SCDMA system filtering The minimum attenuation value of the 2.4G signal can be calculated to obtain the maximum transmission power of the wifi signal allowed. Specifically, the wifi signal transmission power can be determined according to the following formula (1):

P-X-Y<Z; (1)

Among them, P is the wifi signal transmission power, X is the minimum attenuation value of the TD-SCDMA system filter to the 2.4G signal, Y is the isolation, and Z is the maximum interference limit of the TD-SCDMA system.

The following describes the determination of the maximum interference limit of the TD-SCDMA system. Firstly, the interference of wifi signal to TD-SCDMA signal is explained. Fig. 2 is a schematic diagram of distribution of WLAN channels and frequency points. As shown in Fig. 2, the WLAN system works in the 2.4G frequency band. It can be seen from the above that when the wifi signal is coupled to the receiver of the TD-SCDMA system through the antenna of the TD-SCDMA system, interference spurious signals will be generated. If the strength of the interfering stray signal exceeds the maximum interference limit of the TD-SCDMA system, it will cause serious interference to the TD-SCDMA system. Specifically, the maximum interference limit of the TD-SCDMA system can be: According to the communication industry standard YD/T1368.1-20XX, the receiver spurious (conducted spurious) of the TD-SCDMA terminal at the corresponding frequency point of 2.4GHz Maximum limit for spurious signal power. According to the communication industry standard YD/T1368.1-20XX, the spurious signal power of the TD-SCDMA terminal receiver at the corresponding frequency point of 2.4GHz is less than -49dBm, that is, the maximum interference limit of the TD-SCDMA system is -49dBm .

It can be seen from the above that when the wifi signal is coupled to the receiver of the TD-SCDMA system through the antenna of the TD-SCDMA system, interference spurious signals are generated. If the strength of the interference spurious signals is greater than -49dBm, it is considered that the wifi signal is harmful to the TD-SCDMA system. Serious interference occurred. That is, formula (1) can be implemented as P-X-Y<-49.

The determination of the minimum attenuation value of the 2.4G signal by the TD-SCDMA system filter is illustrated below with an example.

Embodiment 1: The implementation of TD1900 (1880-1920MHz) filter is selected.

The filter is a band-pass filter with a center frequency of 1900MHz, suitable for TD-SCDMA product design, and mainly used to isolate interference signals outside the A-band of the TD-SCDMA system.

The selected filter attenuation is shown in the following table, among which: the fourth column is the typical attenuation value, that is, the average attenuation value in this frequency band; the third column is the minimum attenuation value when the product operating environment is 25±2°C; The second column is the minimum attenuation value when the product is used in an environment of -30°C to 85°C; dB min refers to the minimum attenuation value.

It can be seen that the frequency band related to the 2.4G frequency band is 2110-2500MHz, and the minimum attenuation value is 29dB.

Embodiment 2: The implementation of TD2100 (2010-2025MHz) filter is selected.

The selected filter attenuation is shown in the table below. Similarly, the fourth column is the typical attenuation value, that is, the average attenuation value in this frequency band; the third column is the minimum attenuation when the product operating environment is 25±2°C value; the second column is the minimum attenuation value when the product is used in an environment of -30°C to 85°C; dB min refers to the minimum attenuation value.

It can be seen that the frequency band related to the 2.4G frequency band is 2170-2500MHz, and the minimum attenuation value is 32dB.

Because the TD-SCDMA system supports two frequency bands of 1900MHz and 2100MHz. So generally speaking, the minimum attenuation value of the TD-SCDMA system filter to the 2.4G signal can be determined as 29dB.

Here is an example to illustrate the calculation of wifi signal transmission power. In this example, during the TD-SCDMA RF test, wifi is in normal working state. The minimum attenuation value of the TD-SCDMA system filter for 2.4G signals is 29dB. The maximum interference limit of the TD-SCDMA system is the standard requirement that the spurious signal power is less than -49dBm. If the isolation between the wifi system and the TD-SCDMA system is measured is 30dB, then according to formula (1), P-29-30<-49, the transmit power of wifi can be reduced below 10dBm.

During specific implementation, since according to the European standard EIRP (Equivalent Isotropic Raditated Power, equivalent isotropic radiated power) standard, the maximum wifi signal transmission power does not exceed 100mW, that is, 20dBm, then the wifi signal transmission determined according to the method of the embodiment of the present invention When the maximum power limit is greater than 20dBm, you can choose 20dBm as the maximum transmission power of the wifi signal.

Based on the same inventive concept, an interference processing device is also provided in an embodiment of the present invention, as described in the following embodiments. Since the problem-solving principle of the device is similar to the interference processing method, the implementation of the device can refer to the implementation of the interference processing method, and repeated descriptions will not be repeated.

FIG. 3 is a schematic structural diagram of an interference processing device in an embodiment of the present invention. As shown in FIG. 3 , the interference processing device in an embodiment of the present invention may include:

Isolation degree determination module 301, is used for determining the isolation degree between wifi system and time division synchronous code division multiple access TD-SCDMA system;

The transmission power determination module 302 is used to determine the wifi signal transmission power according to the isolation, the maximum interference limit of the TD-SCDMA system and the minimum attenuation value of the TD-SCDMA system filter to the 2.4G signal.

During specific implementation, the transmission power determination module 302 can be specifically used for:

Determine the wifi signal transmission power according to the following formula:

P-X-Y<Z;

Among them, P is the wifi signal transmission power, X is the minimum attenuation value of the TD-SCDMA system filter to the 2.4G signal, Y is the isolation, and Z is the maximum interference limit of the TD-SCDMA system.

Fig. 4 is a schematic structural diagram of a specific implementation of the interference processing device in the embodiment of the present invention. As shown in Fig. 4, the interference processing device in the embodiment of the present invention may further include:

The attenuation value determination module 401 is configured to determine the minimum attenuation value of the TD-SCDMA system filter for 2.4G signals to be 29dB.

Fig. 5 is a schematic structural diagram of a specific implementation of the interference processing device in the embodiment of the present invention. As shown in Fig. 5, the interference processing device in the embodiment of the present invention may further include:

The interference limit determination module 501 is used to determine the maximum interference limit of the TD-SCDMA system: the maximum limit of the spurious signal power of the receiver of the TD-SCDMA terminal on the corresponding frequency point of 2.4 GHz. During implementation, the interference limit determination module 501 may also be included in the interference processing apparatus shown in FIG. 4 .

During specific implementation, the interference limit determination module 501 may specifically be used to determine the maximum interference limit of the TD-SCDMA system as -49dBm.

During specific implementation, the transmit power determining module 302 may be specifically configured to select 20 dBm as the maximum transmit power of the wifi signal when the determined maximum limit of the transmit power of the wifi signal is greater than 20 dBm.

In the embodiment of the present invention, determine the degree of isolation between the wifi system and the TD-SCDMA system; according to the degree of isolation, the maximum interference limit of the TD-SCDMA system and the TD-SCDMA system filter For the minimum attenuation value of the 2.4G signal, determine the wifi signal transmission power; it can avoid the interference of the wifi signal to the TD-SCDMA signal when the Mifi device integrates the TD-SCDMA chip and the wifi chip.

Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems, or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. Protection scope, within the spirit and principles of the present invention, any modification, equivalent replacement, improvement, etc., shall be included in the protection scope of the present invention.

Claims (12)

1. An interference processing method, characterized in that, comprising: Determine the isolation between the wifi system and the time division synchronous code division multiple access TD-SCDMA system; According to the isolation degree, the maximum interference limit of the TD-SCDMA system and the minimum attenuation value of the TD-SCDMA system filter to the 2.4G signal, determine the wifi signal transmission power. 2. the method for claim 1 is characterized in that, according to the interference maximum limit value of described isolation degree, TD-SCDMA system and TD-SCDMA system filter to the minimum attenuation value of 2.4G signal, determine wifi signal transmission power, including: Determine the wifi signal transmission power according to the following formula: P-X-Y<Z; Among them, P is the wifi signal transmission power, X is the minimum attenuation value of the TD-SCDMA system filter to the 2.4G signal, Y is the isolation, and Z is the maximum interference limit of the TD-SCDMA system. 3. The method according to claim 1 or 2, characterized in that the minimum attenuation value of the TD-SCDMA system filter to the 2.4G signal is 29dB. 4. The method according to claim 1 or 2, characterized in that the maximum interference limit of the TD-SCDMA system is: the receiver of the TD-SCDMA terminal strays to the maximum of the spurious signal power on the corresponding frequency point of 2.4GHz limit. 5. The method according to claim 4, characterized in that the maximum interference limit of the TD-SCDMA system is -49dBm. 6. The method according to claim 1 or 2, wherein, when the determined maximum transmission power limit of the wifi signal is greater than 20dBm, 20dBm is selected as the maximum transmission power of the wifi signal. 7. An interference processing device, comprising: The isolation degree determination module is used to determine the isolation degree between the wifi system and the time division synchronous code division multiple access TD-SCDMA system; The transmission power determination module is used to determine the wifi signal transmission power according to the isolation, the maximum interference limit of the TD-SCDMA system and the minimum attenuation value of the TD-SCDMA system filter to the 2.4G signal. 8. The device according to claim 7, wherein the transmit power determining module is specifically used for: Determine the wifi signal transmission power according to the following formula: P-X-Y<Z; Among them, P is the wifi signal transmission power, X is the minimum attenuation value of the TD-SCDMA system filter to the 2.4G signal, Y is the isolation, and Z is the maximum interference limit of the TD-SCDMA system. 9. The device according to claim 7 or 8, further comprising: The attenuation value determination module is used to determine the minimum attenuation value of the TD-SCDMA system filter for 2.4G signals is 29dB. 10. The device according to claim 7 or 8, further comprising: The interference limit determination module is used to determine the maximum interference limit of the TD-SCDMA system: the maximum limit of the spurious signal power of the TD-SCDMA terminal receiver spurious at the corresponding frequency point of 2.4GHz. 11. The device according to claim 10, wherein the interference limit determination module is specifically configured to determine the maximum interference limit of the TD-SCDMA system as -49dBm. 12. The device according to claim 7 or 8, wherein the transmit power determining unit is specifically configured to select 20dBm as the maximum transmit power of the wifi signal when the determined maximum limit of the transmit power of the wifi signal is greater than 20dBm.