CN109756246B - Method and device for inhibiting GSM (global system for mobile communications) from interfering with Bluetooth and mobile terminal - Google Patents
Method and device for inhibiting GSM (global system for mobile communications) from interfering with Bluetooth and mobile terminal Download PDFInfo
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- CN109756246B CN109756246B CN201711064070.3A CN201711064070A CN109756246B CN 109756246 B CN109756246 B CN 109756246B CN 201711064070 A CN201711064070 A CN 201711064070A CN 109756246 B CN109756246 B CN 109756246B
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Abstract
The invention provides a method, a device and a mobile terminal for inhibiting GSM (global system for mobile communications) from interfering Bluetooth. The method comprises the following steps: when the GSM service and the Bluetooth function are simultaneously started, acquiring a frequency band currently used by the GSM service, an intermediate frequency of the GSM and a transmitting/receiving channel frequency; calculating a Bluetooth channel under the GSM service according to the frequency band currently used by the GSM service, the intermediate frequency of the GSM and the frequency of a transmitting/receiving channel; and carrying out intermediate frequency hopping operation on the Bluetooth channel. The invention can effectively inhibit the interference of GSM to the Bluetooth, improve the receiving sensitivity of the Bluetooth and reduce the receiving error rate of the Bluetooth.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a mobile terminal for suppressing bluetooth interference from GSM.
Background
When a user makes a call or makes a cell search using a GSM (Global System for Mobile communication) Mobile terminal, the bluetooth reception sensitivity of the Mobile terminal becomes abnormal. Wherein, the error rate of the Bluetooth receiving will rise to 7% -9.5%, and the sensitivity of the Bluetooth receiving will deteriorate by about 30 dB. This deterioration in sensitivity is unacceptable for the user to use the bluetooth function. And other bluetooth receiving devices will not normally demodulate the interfered bluetooth signal.
Disclosure of Invention
The method, the device and the mobile terminal for inhibiting the GSM from interfering the Bluetooth can effectively inhibit the GSM from interfering the Bluetooth, improve the Bluetooth receiving sensitivity and reduce the Bluetooth receiving error rate.
In a first aspect, the present invention provides a method for suppressing GSM interference to bluetooth, including:
when the GSM service and the Bluetooth function are simultaneously started, acquiring a frequency band currently used by the GSM service, an intermediate frequency of the GSM and a transmitting/receiving channel frequency;
calculating a Bluetooth channel under the GSM service according to the frequency band currently used by the GSM service, the intermediate frequency of the GSM and the frequency of a transmitting/receiving channel;
and carrying out intermediate frequency hopping operation on the Bluetooth channel.
Optionally, under the interference of a GSM voltage-controlled oscillator, the calculating a bluetooth channel in the GSM service according to a frequency band currently used by the GSM service, an intermediate frequency of GSM, and a frequency of a transmission/reception channel includes: calculating the Bluetooth channel under the GSM service according to the following formula:
abs(abs((GSMfreq-GSMIF)*N1-(BTfreq-BTIF)*N2)-abs(BTIF))≤Δ2(F) (2)
GSMfreq is the frequency of a transmitting/receiving channel of GSM, GSMIF is the intermediate frequency of GSM, BTfreq is the frequency of a Bluetooth channel, BTIF is the intermediate frequency of Bluetooth, BTRefFreq is the reference frequency for calculating the Bluetooth channel, BTCH represents the Bluetooth channel, delta 1(F) is the intermediate frequency mixed between a GSM voltage-controlled oscillator and a Bluetooth local oscillator, delta 2(F) is the frequency distance between BTIF and delta 1(F), and N1 and N2 are the frequency multiplication coefficients of the mixed frequency.
Optionally, the performing an intermediate frequency hopping operation on the bluetooth channel includes: and judging whether the formula (2) is established, if so, performing intermediate frequency hopping on the Bluetooth channel calculated according to the formula (1), otherwise, continuing to work at the current intermediate frequency of the Bluetooth channel, and not performing intermediate frequency hopping.
Optionally, the performing an intermediate frequency hopping operation on the bluetooth channel includes: and switching the current positive intermediate frequency of the Bluetooth channel to a negative intermediate frequency, or switching the current negative intermediate frequency of the Bluetooth channel to a positive intermediate frequency, wherein the absolute values of the intermediate frequencies before and after switching are equal.
In a second aspect, the present invention provides an apparatus for suppressing GSM interference to bluetooth, including:
the device comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring a frequency band currently used by the GSM service, an intermediate frequency of the GSM and a transmitting/receiving channel frequency when the GSM service and the Bluetooth function are simultaneously started;
a calculating unit, configured to calculate a bluetooth channel in the GSM service according to a frequency band currently used by the GSM service, an intermediate frequency of GSM, and a transmitting/receiving channel frequency;
and the processing unit is used for carrying out intermediate frequency hopping operation on the Bluetooth channel.
Optionally, the calculating unit is configured to calculate a bluetooth channel under the GSM service according to the following formula:
abs(abs((GSMfreq-GSMIF)*N1-(BTfreq-BTIF)*N2)-abs(BTIF))≤Δ2(F) (2)
GSMfreq is the frequency of a transmitting/receiving channel of GSM, GSMIF is the intermediate frequency of GSM, BTfreq is the frequency of a Bluetooth channel, BTIF is the intermediate frequency of Bluetooth, BTRefFreq is the reference frequency for calculating the Bluetooth channel, BTCH represents the Bluetooth channel, delta 1(F) is the intermediate frequency mixed between a GSM voltage-controlled oscillator and a Bluetooth local oscillator, delta 2(F) is the frequency distance between BTIF and delta 1(F), and N1 and N2 are the frequency multiplication coefficients of the mixed frequency.
Optionally, the processing unit is configured to determine whether the formula (2) is satisfied, and if so, perform an intermediate frequency hopping on the bluetooth channel calculated according to the formula (1), otherwise, continue to operate at the current intermediate frequency of the bluetooth channel, and do not perform the intermediate frequency hopping.
Optionally, the processing unit is configured to switch the current positive intermediate frequency of the bluetooth channel to a negative intermediate frequency, or switch the current negative intermediate frequency of the bluetooth channel to a positive intermediate frequency, where absolute values of the intermediate frequencies before and after switching are equal.
In a third aspect, the present invention provides a mobile terminal, where the mobile terminal includes the above apparatus for suppressing GSM interference to bluetooth.
According to the method, the device and the mobile terminal for inhibiting the GSM from interfering the Bluetooth, provided by the embodiment of the invention, when the GSM service and the Bluetooth function are simultaneously started, the frequency band currently used by the GSM service, the GSM intermediate frequency and the transmitting/receiving channel frequency are obtained, the Bluetooth channel under the GSM service is calculated according to the frequency band currently used by the GSM service, the GSM intermediate frequency and the transmitting/receiving channel frequency, and the Bluetooth channel is subjected to intermediate frequency hopping operation. Compared with the prior art, the method can effectively inhibit the interference of the GSM to the Bluetooth, improve the Bluetooth receiving sensitivity and reduce the Bluetooth receiving error rate.
Drawings
FIG. 1 is a flowchart illustrating a method for suppressing GSM interference to Bluetooth according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an apparatus for suppressing GSM-to-bluetooth interference according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a method for suppressing interference of GSM to bluetooth, as shown in fig. 1, the method includes:
and S11, when the GSM service and the Bluetooth function are simultaneously started, acquiring the frequency band currently used by the GSM service, the intermediate frequency of the GSM and the frequency of a transmitting/receiving channel.
S12, calculating the Bluetooth channel under the GSM service according to the frequency band currently used by the GSM service, the intermediate frequency of the GSM and the frequency of the transmitting/receiving channel.
And S13, performing intermediate frequency hopping operation on the Bluetooth channel.
According to the method for inhibiting the interference of the GSM on the Bluetooth, provided by the embodiment of the invention, when the GSM service and the Bluetooth function are simultaneously started, the frequency band currently used by the GSM service, the intermediate frequency of the GSM and the frequency of the transmitting/receiving channel are obtained, the Bluetooth channel under the GSM service is calculated according to the frequency band currently used by the GSM service, the intermediate frequency of the GSM and the frequency of the transmitting/receiving channel, and the intermediate frequency hopping operation is carried out on the Bluetooth channel. Compared with the prior art, the method can effectively inhibit the interference of the GSM to the Bluetooth, improve the Bluetooth receiving sensitivity and reduce the Bluetooth receiving error rate.
The method for suppressing the interference of GSM to bluetooth according to the present invention is described in detail with reference to the following embodiments.
Taking bluetooth 2DH 578 channel as an example, the following table 1 shows the interference ranges of the transmission/reception channels corresponding to different GSM frequency bands.
TABLE 1
The dark gray display position is a channel with the most serious interference of the frequency band to the Bluetooth, and under the channel, the Bluetooth receiving error rate reaches the range of 7% -9%.
The detailed process of the method for inhibiting the interference of the GSM on the Bluetooth is as follows:
step 1: the GSM software transmits the frequency band, the intermediate frequency and the frequency currently used by the GSM service to the bluetooth host together, and the following parameters are transmitted:
GSM frequency band: 850/900/1800/1900.
GSM transmit/receive intermediate frequency: +/-200 kHz.
GSM frequency: the transmission/reception frequency.
Step 2: under the interference of the GSM voltage-controlled oscillator, after the Bluetooth host receives the information transmitted from the GSM, the Bluetooth host calculates the Bluetooth channel under the GSM information according to the following formulas (1) and (2).
abs(abs((GSMfreq-GSMIF)*N1-(BTfreq-BTIF)*N2)-abs(BTIF))≤Δ2(F) (2)
Wherein, GSMfreq is the frequency of the transmitting/receiving channel of GSM 850/900/1800/1900;
GSMIF is the intermediate frequency of GSM, e.g. +/-200 kHz;
BTfreq is the bluetooth channel frequency from channel 0 to channel 78;
BTIF is the intermediate frequency of Bluetooth, such as +/-750kHz, +/-1 MHz;
BTRefFreq is the reference frequency for calculating the Bluetooth channel, 2402 MHz;
BTCH denotes the bluetooth channel;
delta 1(F) is the mixed intermediate frequency between the GSM voltage-controlled oscillator and the Bluetooth local oscillator;
Δ 2(F) is the frequency distance between BTIF and Δ 1 (F);
n1 and N2 are frequency multiplication coefficients of the mixed frequency, which can be specifically determined according to table 2;
TABLE 2
| Frequency band | N1 | N2 |
| Low frequency (850/900) | 8 | 3 |
| High frequency (1800/1900) | 4 | 3 |
Specifically, firstly, a bluetooth channel is obtained through calculation according to formula (1), then whether formula (2) is established or not is judged, if yes, step 3 is executed, otherwise, the intermediate frequency of the bluetooth channel is continuously worked, and the intermediate frequency is not jumped.
And step 3: and the Bluetooth host sends the calculated Bluetooth channel to the Bluetooth controller, and the Bluetooth controller performs intermediate frequency hopping according to the Bluetooth channel information.
Specifically, the bluetooth controller switches the current positive intermediate frequency of the bluetooth channel to a negative intermediate frequency, or switches the current negative intermediate frequency of the bluetooth channel to a positive intermediate frequency, wherein absolute values of the intermediate frequencies before and after switching are equal.
For example, from 0.75MHz to-0.75 MHz.
The bluetooth receiving performance under the frequency hopping intermediate frequency scheme provided by the embodiment of the invention is compared with the bluetooth receiving performance under the default intermediate frequency scheme for verification.
As shown in table 3, the bluetooth reception performance in the default if scheme is adopted.
TABLE 3
As shown in table 4, the bluetooth reception performance under the frequency hopping scheme provided by the embodiment of the present invention is shown.
TABLE 4
Comparing table 3 with table 4, it can be found that by using the intermediate frequency hopping scheme provided by the embodiment of the present invention, when the GSM service is performed, the deterioration of the bluetooth receiving sensitivity can be greatly improved, the bluetooth receiving sensitivity is improved by 23-28 dB, and the normal level can be reached; the error rate of the bluetooth reception is also improved from 9.8% to 0.014%, which is a great improvement to the performance of the bluetooth reception.
An embodiment of the present invention further provides a device for suppressing interference of GSM to bluetooth, as shown in fig. 2, the device includes:
an obtaining unit 11, configured to obtain a frequency band currently used by a GSM service, an intermediate frequency of the GSM, and a transmission/reception channel frequency when the GSM service and the bluetooth function are simultaneously turned on;
a calculating unit 12, configured to calculate a bluetooth channel in the GSM service according to a frequency band currently used by the GSM service, an intermediate frequency of GSM, and a frequency of a transmitting/receiving channel;
and the processing unit 13 is configured to perform an intermediate frequency hopping operation on the bluetooth channel.
According to the device for inhibiting the interference of the GSM on the Bluetooth, provided by the embodiment of the invention, when the GSM service and the Bluetooth function are simultaneously started, the frequency band currently used by the GSM service, the intermediate frequency of the GSM and the frequency of the transmitting/receiving channel are obtained, the Bluetooth channel under the GSM service is calculated according to the frequency band currently used by the GSM service, the intermediate frequency of the GSM and the frequency of the transmitting/receiving channel, and the intermediate frequency hopping operation is carried out on the Bluetooth channel. Compared with the prior art, the method can effectively inhibit the interference of the GSM to the Bluetooth, improve the Bluetooth receiving sensitivity and reduce the Bluetooth receiving error rate.
Optionally, the calculating unit 12 is configured to calculate a bluetooth channel under the GSM service according to the following formula:
abs(abs((GSMfreq-GSMIF)*N1-(BTfreq-BTIF)*N2)-abs(BTIF))≤Δ2(F) (2)
GSMfreq is the frequency of a transmitting/receiving channel of GSM, GSMIF is the intermediate frequency of GSM, BTfreq is the frequency of a Bluetooth channel, BTIF is the intermediate frequency of Bluetooth, BTRefFreq is the reference frequency for calculating the Bluetooth channel, BTCH represents the Bluetooth channel, delta 1(F) is the intermediate frequency mixed between a GSM voltage-controlled oscillator and a Bluetooth local oscillator, delta 2(F) is the frequency distance between BTIF and delta 1(F), and N1 and N2 are the frequency multiplication coefficients of the mixed frequency.
Optionally, the processing unit 13 is configured to determine whether the formula (2) is satisfied, and if so, perform an intermediate frequency hopping on the bluetooth channel calculated according to the formula (1), otherwise, continue to operate at the current intermediate frequency of the bluetooth channel, and do not perform the intermediate frequency hopping.
Optionally, the processing unit 13 is configured to switch the current positive intermediate frequency of the bluetooth channel to a negative intermediate frequency, or switch the current negative intermediate frequency of the bluetooth channel to a positive intermediate frequency, where absolute values of the intermediate frequencies before and after switching are equal.
The apparatus of this embodiment may be configured to implement the technical solutions of the above method embodiments, and the implementation principles and technical effects are similar, which are not described herein again.
The embodiment of the invention also provides a mobile terminal which comprises the device for inhibiting the interference of the GSM on the Bluetooth.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A method for suppressing GSM-to-bluetooth interference, comprising:
when the GSM service and the Bluetooth function are simultaneously started, acquiring a frequency band currently used by the GSM service, an intermediate frequency of the GSM and a transmitting/receiving channel frequency;
calculating a Bluetooth channel under the GSM service according to the frequency band currently used by the GSM service, the intermediate frequency of the GSM and the frequency of a transmitting/receiving channel;
and carrying out intermediate frequency hopping operation on the Bluetooth channel.
2. The method of claim 1, wherein the calculating the bluetooth channel in the GSM service according to the currently used frequency band of the GSM service, the intermediate frequency of GSM, and the frequency of the transmit/receive channel under the interference of a GSM voltage-controlled oscillator comprises: calculating the Bluetooth channel under the GSM service according to the following formula:
abs(abs((GSMfreq-GSMIF)*N1-(BTfreq-BTIF)*N2)-abs(BTIF))≤Δ2(F) (2)
GSMfreq is the frequency of a transmitting/receiving channel of GSM, GSMIF is the intermediate frequency of GSM, BTfreq is the frequency of a Bluetooth channel, BTIF is the intermediate frequency of Bluetooth, BTRefFreq is the reference frequency for calculating the Bluetooth channel, BTCH represents the Bluetooth channel, delta 1(F) is the intermediate frequency mixed between a GSM voltage-controlled oscillator and a Bluetooth local oscillator, delta 2(F) is the frequency distance between BTIF and delta 1(F), and N1 and N2 are the frequency multiplication coefficients of the mixed frequency.
3. The method according to claim 1 or 2, wherein the performing the frequency hopping operation on the bluetooth channel comprises: and judging whether the formula (2) is established, if so, performing intermediate frequency hopping on the Bluetooth channel calculated according to the formula (1), otherwise, continuing to work at the current intermediate frequency of the Bluetooth channel, and not performing intermediate frequency hopping.
4. The method of claim 3, wherein the performing the IF hopping operation on the Bluetooth channel comprises: and switching the current positive intermediate frequency of the Bluetooth channel to a negative intermediate frequency, or switching the current negative intermediate frequency of the Bluetooth channel to a positive intermediate frequency, wherein the absolute values of the intermediate frequencies before and after switching are equal.
5. An apparatus for suppressing GSM-to-bluetooth interference, comprising:
the device comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring a frequency band currently used by the GSM service, an intermediate frequency of the GSM and a transmitting/receiving channel frequency when the GSM service and the Bluetooth function are simultaneously started;
a calculating unit, configured to calculate a bluetooth channel in the GSM service according to a frequency band currently used by the GSM service, an intermediate frequency of GSM, and a transmitting/receiving channel frequency;
and the processing unit is used for carrying out intermediate frequency hopping operation on the Bluetooth channel.
6. The apparatus of claim 5, wherein the calculating unit is configured to calculate the bluetooth channel under the GSM service according to the following formula:
abs(abs((GSMfreq-GSMIF)*N1-(BTfreq-BTIF)*N2)-abs(BTIF))≤Δ2(F) (2)
GSMfreq is the frequency of a transmitting/receiving channel of GSM, GSMIF is the intermediate frequency of GSM, BTfreq is the frequency of a Bluetooth channel, BTIF is the intermediate frequency of Bluetooth, BTRefFreq is the reference frequency for calculating the Bluetooth channel, BTCH represents the Bluetooth channel, delta 1(F) is the intermediate frequency mixed between a GSM voltage-controlled oscillator and a Bluetooth local oscillator, delta 2(F) is the frequency distance between BTIF and delta 1(F), and N1 and N2 are the frequency multiplication coefficients of the mixed frequency.
7. The apparatus according to claim 5 or 6, wherein the processing unit is configured to determine whether equation (2) is satisfied, and if so, perform an intermediate frequency hopping on the bluetooth channel calculated according to equation (1), otherwise, continue to operate at the current intermediate frequency of the bluetooth channel without performing the intermediate frequency hopping.
8. The apparatus of claim 7, wherein the processing unit is configured to switch a current positive intermediate frequency of the bluetooth channel to a negative intermediate frequency, or switch a current negative intermediate frequency of the bluetooth channel to a positive intermediate frequency, and wherein absolute values of the intermediate frequencies before and after switching are equal.
9. A mobile terminal, characterized in that it comprises an apparatus for suppressing GSM-to-bluetooth interference according to any one of claims 5 to 8.
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