CN212486536U - Correcting device for GFSK frequency offset of Bluetooth low energy - Google Patents
Correcting device for GFSK frequency offset of Bluetooth low energy Download PDFInfo
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Abstract
The utility model discloses a correcting unit of GFSK frequency deviation of bluetooth low energy, correcting unit include frequency deviation correction control circuit and baseband processor, and frequency deviation correction control circuit includes frequency deviation detection circuitry and frequency deviation correction circuit. The baseband processor takes the correction control value related to the amplitude of the signal to be corrected as the input of the first alternative selector, and the frequency offset detection circuit outputs the scale factor of the correction control value. The baseband processor takes the scale factor and the signal to be corrected as the input of the frequency offset correction circuit, and the frequency offset correction circuit corrects the GFSK frequency offset of the signal to be corrected based on the scale factor. The frequency offset of the signal to be corrected is corrected by the frequency offset detection circuit and the frequency offset correction circuit, so that the problem that the GFSK frequency offset is too large from frequency offset values (such as 250KHZ and 500KHZ) specified by a standard is avoided, and the normal work of the Bluetooth chip is ensured.
Description
Technical Field
The utility model relates to a wireless communication field especially relates to a correcting unit of GFSK frequency deviation of bluetooth low energy.
Background
The transmission modulation mode of the bluetooth low energy is Gaussian Frequency Shift Keying (GFSK), and the frequency offset of the modulation signal of the bluetooth low energy is adjusted by the GFSK. Under the condition that the data transmission bit rate of a physical layer is 1Mbps, when the low-power consumption Bluetooth standard requires to send data 1, the frequency deviation of a GFSK modulation signal of the low-power consumption Bluetooth based on GFSK modulation is 250 KHZ; when the bluetooth low energy standard requires data 0 to be transmitted, the frequency offset of the GFSK modulated signal of bluetooth low energy based on GFSK modulation is-250 KHZ. Under the condition that the data transmission bit rate of a physical layer is 2Mbps, when the low-power consumption Bluetooth standard requires to send data 1, the frequency deviation of a GFSK modulation signal of the low-power consumption Bluetooth based on GFSK modulation is 500 KHZ; when the bluetooth low energy standard requires data 0 to be transmitted, the frequency offset of the GFSK modulated signal based on GFSK modulated bluetooth low energy is-500 KHZ.
When the absolute value of the frequency offset of the GFSK modulation signal is too small, the bit error rate of a receiver of the corresponding Bluetooth low energy can be increased, and when the absolute value of the frequency offset of the GFSK modulation signal is too large, the spectrum template violation can be caused. Factors influencing GFSK frequency deviation include chip-to-chip process variation and power supply variation, and one prominent factor is the working temperature of the low-power Bluetooth chip. As the operating temperature of the bluetooth low energy chip varies, many bluetooth chips cannot operate normally at very high or very low temperatures (e.g., above 105 celsius or below minus 30 celsius). One of the reasons is that the GFSK frequency offset is too large to deviate from the standard-specified frequency offset values (e.g., 250KHZ and 500KHZ), and therefore, how to stabilize the GFSK frequency offset value around the specified frequency offset value is an important way to ensure the normal operation of the bluetooth chip.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problem that the frequency deviation value of GFSK frequency deviation regulation in the prior art causes the bluetooth chip not to work normally
In order to solve the above problem, an embodiment of the present invention discloses a correction device for GFSK frequency offset of bluetooth low energy, the correction device includes:
a frequency offset correction control circuit and a baseband processor connected to the frequency offset correction control circuit;
the frequency offset correction control circuit comprises a frequency offset detection circuit and a frequency offset correction circuit;
the frequency offset detection circuit and the frequency offset correction circuit are connected through a first alternative selector;
when the baseband processor takes a correction control value related to the amplitude of a signal to be corrected as the input of the first alternative selector, the frequency offset detection circuit outputs a scale factor of the correction control value;
the baseband processor takes the scale factor and the signal to be corrected as the input of the frequency offset correction circuit, and the frequency offset correction circuit corrects the GFSK frequency offset of the signal to be corrected based on the scale factor.
By adopting the technical scheme, the frequency offset of the signal to be corrected is corrected through the frequency offset detection circuit and the frequency offset correction circuit, the problem that the GFSK frequency offset is too large from frequency offset values (such as 250KHZ and 500KHZ) specified by a standard is avoided, and the normal work of the Bluetooth chip is ensured.
According to some embodiments of the present application, the frequency offset detection circuit comprises: the device comprises a phase-locked loop frequency modulator, a high-frequency counter and a timer;
the high-frequency counter is respectively connected with the phase-locked loop frequency modulator and the timer;
the baseband processor takes a positive number N and a negative number N as correction control values as the input of the phase-locked loop frequency modulator respectively, and the phase-locked loop frequency modulator outputs a first high-frequency signal and a second high-frequency signal respectively;
in a time interval T, taking the first high-frequency signal and the second high-frequency signal as the input of the high-frequency counter, wherein the high-frequency counter counts the number of cycles of the first high-frequency signal and the second high-frequency signal respectively to obtain a first number of cycles corresponding to the first high-frequency signal and a second number of cycles corresponding to the second high-frequency signal;
the baseband processor determines a scaling factor for the signal to be corrected based on a standard frequency offset value for the signal to be corrected, the first number of cycles, the second number of cycles, a positive number N, and the time interval T.
According to some embodiments of the present application, the correction apparatus for GFSK frequency offset for bluetooth low energy further comprises a memory, the time interval T and the correction control value are stored in the memory, and the correction control value is greater than a first preset threshold and the time interval T is greater than a second preset threshold.
According to some embodiments of the present application, the memory further comprises a storage area having correction conditions stored therein;
the correction conditions include: the Bluetooth chip of the low-power-consumption Bluetooth is in cold start, or the temperature of the Bluetooth chip of the low-power-consumption Bluetooth meets the requirement of a correction range.
According to some embodiments of the present application, the memory further comprises a storage area having a positive number N stored therein, the N being 256.
According to some embodiments of the present application, the baseband processor includes a memory having stored therein a scale factor calculation formula of
Wherein the content of the first and second substances,
said C is1For the second cycle number, said C0Is the first cycle number, T is the time interval, dN is the frequency offset value of the amplitude N of the signal to be corrected.
According to some embodiments of the present application, the frequency offset correction circuit comprises: a second alternative selector, a GFSK filter and a multiplier;
the scale factor is used as the input of the second alternative selector, and the output of the second alternative selector is used as the input of the multiplier;
taking a bit stream related to the signal to be corrected as an input of the GFSK filter, and taking the signal to be corrected output by the GFSK filter as an input of the multiplier;
and the signal to be corrected which is processed by the multiplier is scaled by the scale factor to obtain the corrected value of the GFSK frequency offset of the corrected signal.
According to some embodiments of the present application, a memory in the baseband processor stores a signal to be corrected related to a 1Mbps bit stream, and the baseband processor calculates a scale factor of the 1Mbps bit stream to be
The bit stream of 1Mbps is used as the input of the GFSK low-pass filter, and the output of the GFSK low-pass filter is used as the signal to be corrected;
dividing the scale factor into
Inputting the signal to be corrected to a multiplier for reduction, and using the reduction value as the input of a phase-locked loop frequency modulator;
the corrected value of the GFSK frequency offset of the corrected signal after being modulated by the phase-locked loop frequency modulator is 250 KHz.
According to some embodiments of the present application, a memory in the baseband processor stores a signal to be corrected related to a 2Mbps bit stream, and the baseband processor calculates a scale factor of the signal to be corrected related to the 2Mbps bit stream based on a scale factor calculation formula stored in the memory
A 2Mbps bit stream is used as the input of the GFSK low-pass filter, and the output of the GFSK low-pass filter is used as the signal to be corrected;
dividing the scale factor into
Inputting the signal to be corrected to the multiplier for reduction, and using the reduction value as the input of the phase-locked loop frequency modulator;
and the GFSK frequency deviation value of the corrected signal after passing through the phase-locked loop frequency modulator is 500 KHz.
Other features and corresponding advantages of the invention are set forth in the following part of the specification, and it is to be understood that at least some of the advantages become apparent from the description of the invention.
Drawings
Fig. 1(a) is a schematic structural diagram of a correction apparatus for GFSK frequency offset of bluetooth low energy according to an embodiment of the present invention;
fig. 1(b) is a schematic structural diagram of a baseband processor according to an embodiment of the present invention;
fig. 1(c) is a schematic structural diagram of another correction apparatus for GFSK frequency offset of bluetooth low energy according to an embodiment of the present invention.
Detailed Description
The following description is provided for illustrative embodiments of the present invention, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. While the invention will be described in conjunction with the preferred embodiments, it is not intended that features of the invention be limited to only those embodiments. On the contrary, the intention of implementing the novel features described in connection with the embodiments is to cover other alternatives or modifications which may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Furthermore, some of the specific details are omitted from the description so as not to obscure or obscure the present invention. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The transmission modulation mode of the bluetooth low energy is Gaussian Frequency Shift Keying (GFSK), and the frequency offset of the modulation signal of the bluetooth low energy is adjusted by the GFSK. Under the condition that the data transmission bit rate of a physical layer is 1Mbps, when the low-power consumption Bluetooth standard requires to send data 1, the frequency deviation of a GFSK modulation signal of the low-power consumption Bluetooth based on GFSK modulation is 250 KHZ; when the bluetooth low energy standard requires data 0 to be transmitted, the frequency offset of the GFSK modulated signal of bluetooth low energy based on GFSK modulation is-250 KHZ. Under the condition that the data transmission bit rate of a physical layer is 2Mbps, when the low-power consumption Bluetooth standard requires to send data 1, the frequency deviation of a GFSK modulation signal of the low-power consumption Bluetooth based on GFSK modulation is 500 KHZ; when the bluetooth low energy standard requires data 0 to be transmitted, the frequency offset of the GFSK modulated signal based on GFSK modulated bluetooth low energy is-500 KHZ.
The present invention provides an embodiment of a modulation signal (to-be-corrected signal) modulation method for modulating a frequency offset (frequency deviation) amount in a modulation signal of a GFSK, wherein the modulation signal of the GFSK has a frequency offset of 250KHz and-250 KHz when a physical layer data transmission bit rate is 1Mbps, and the frequency offset of the GFSK modulation signal corresponding to 1 and 0 is set as the purpose. The modulated signal of the GFSK is intended to make the frequency offsets of the GFSK modulated signal corresponding to 1 and 0 500KHz and-500 KHz, respectively, when the physical layer data transmission bit rate is 2 Mbps. In chinese, frequency offset is also used to refer to frequency offset (frequency offset) of a carrier frequency, for example, a GFSK modulated signal is transmitted on a 2402MHz channel, and when 1 is continuously transmitted, the frequency of the signal is 2402.4 MHz. When 0 s are continuously transmitted, the signal frequency is 2401.8 MHz. The carrier frequency offset at this time is 100KHz ((2402.4+ 2401.8)/2-2402 ═ 100KHz), and the frequency offset (frequency deviation) in the GFSK modulated signal is 300 KHz. Thus, frequency offset (frequency deviation) and carrier frequency offset (frequency offset) in GFSK modulated signals are two different concepts, and the present invention is directed to correction of frequency offset (frequency deviation) in modulated signals.
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Referring to fig. 1(a), fig. 1(b) and fig. 1(c), fig. 1(a) is a schematic structural diagram of a correction apparatus for GFSK frequency offset of bluetooth low energy according to an embodiment of the present invention, fig. 1(b) is a schematic structural diagram of a baseband processor according to an embodiment of the present invention, and fig. 1(c) is a schematic structural diagram of another correction apparatus for GFSK frequency offset of bluetooth low energy according to an embodiment of the present invention.
The embodiment of the present invention is to take the bit stream of 1Mbps and the bit stream of 2Mbps as the examples of the signal to be corrected, the embodiment of the present invention is to explain the correction device of GFSK frequency deviation of bluetooth low energy.
As shown in fig. 1(a), the correction device 1 includes a frequency offset correction control circuit 10 and a baseband processor 20 connected to the frequency offset correction control circuit 10.
The frequency offset correction control circuit 10 includes a frequency offset detection circuit 100 and a frequency offset correction circuit 200.
The frequency offset detection circuit 100 and the frequency offset correction circuit 200 are connected through a first alternative selector 300.
When the correction control value associated with the signal to be corrected is input to the first alternative selector 300, the frequency offset detection circuit 100 outputs a scaling factor of the correction control value.
In the case where the scale factor and the signal to be corrected are input to the frequency offset correction circuit 200, the frequency offset correction circuit 200 corrects the GFSK frequency offset of the signal to be corrected based on the scale factor.
According to some embodiments of the present invention, the frequency offset detection circuit 100 includes, but is not limited to, a phase-locked loop frequency modulator, a high frequency counter, and a timer. Any model can be selected for the models of the pll frequency modulator, the high frequency counter and the timer, and the embodiments of the present invention are not limited herein.
According to some embodiments of the invention, the high frequency counter is connected to the phase locked loop frequency modulator and the timer, respectively;
the baseband processor 20 uses a positive number N and a negative number N as input of the pll frequency modulator, and the pll frequency modulator respectively outputs the first high frequency signal and the second high frequency signal;
in the time interval T, the baseband processor 20 takes the first high frequency signal and the second high frequency signal as the input of a high frequency counter, and the high frequency counter counts the number of cycles of the first high frequency signal and the second high frequency signal respectively to obtain a first number of cycles corresponding to the first high frequency signal and a second number of cycles corresponding to the second high frequency signal;
the baseband processor 20 determines a scaling factor for the signal to be corrected based on the standard frequency offset value, the first number of cycles, the second number of cycles, the positive number N, and the time interval T of the signal to be corrected.
According to some embodiments of the present invention, the frequency offset correction circuit includes, but is not limited to, a GFSK filter, a multiplier 202, a second alternative selector 301, and a power amplifier.
The baseband processor 20 takes the scale factor as the input of the second alternative selector 301, and the output of the second alternative selector 301 is taken as the input of the multiplier 202;
the baseband processor 20 takes the bit stream related to the signal to be corrected as the input of the GFSK filter, and the signal to be corrected output by the GFSK filter is taken as the input of the multiplier 202;
the signal to be corrected, which is passed through the multiplier 202, is scaled by the scale factor to obtain a corrected signal, which is used as the input of the pll frequency modulator.
It should be noted that the structure of the frequency offset detection circuit and the frequency offset correction circuit may also be other structures, and the embodiments of the present invention are not limited herein.
According to some embodiments of the present application, as shown in fig. 1(c), the correction apparatus for GFSK frequency offset of bluetooth low energy further includes a memory 30, the memory 30 is connected to the baseband processor 20, the time interval T and the correction control value are stored in the memory 30, and the correction control value is greater than a first preset threshold and the time interval T is greater than a second preset threshold.
The second preset threshold can be set in a self-defined mode, and in principle, the second preset threshold is set to be larger so as to ensure the correction precision of the GFSK frequency offset.
According to some embodiments of the present application, the memory 30 further includes a storage area, in which the correction condition is stored;
it is noted that the correction of the GFSK frequency offset of bluetooth low energy may be performed after the baseband processor 20 detects a trigger of a correction condition.
According to some embodiments of the invention, the correction condition comprises: the bluetooth chip of bluetooth low energy is in cold start.
According to some embodiments of the invention, the correction condition comprises: the temperature of the Bluetooth chip of the low-power Bluetooth meets the requirement of a correction range.
Specifically, the temperature of the bluetooth chip can be divided into several sections: below-20 degrees, -20 degrees to positive 50 degrees, above 50 degrees. The bluetooth chip will be once corrected when in cold start, and the temperature when the bluetooth chip is in cold start is assumed to be 10 degrees. After the Bluetooth chip is cold started, the temperature sensor can measure the temperature of the Bluetooth chip at regular time, and when the measured temperature of the Bluetooth chip exceeds the range of 10 degrees when the temperature is corrected last time, the correction condition is triggered to start the next correction. It should be noted that the temperature of the bluetooth chip is not limited to the above manner, and the temperature of the bluetooth chip in the calibration condition may be other values according to the practical application.
According to the utility model discloses a some embodiments, the correction condition can also include the time difference of time when last correction to the present moment reaches predetermined time interval (can self-defined setting) to periodic correcting frequency offset. In addition, the correction condition may be of other types, and the embodiment of the present invention is not limited herein.
According to some embodiments of the present application, the memory 30 further includes a storage area having a positive number N stored therein, where N is 256. It should be noted that the value of N may also be other values, such as a number with a word length of 16 bits, and the embodiment of the present invention is not limited herein.
According to some embodiments of the present application, as shown in fig. 1(b), a memory 201 is included in the baseband processor 20.
The memory 201 stores a scale factor calculation formula which is
Wherein the content of the first and second substances,
C1is the second cycle number, C0Is the first cycle number, T is the time interval, dN is the frequency offset value of the signal to be corrected.
The method comprises the following specific steps:
a positive number N and a negative number N of correction control values are inputted to a PLL frequency modulator in a frequency offset detection circuit, and the PLL frequency modulator outputs a high frequency signal (a first high frequency signal corresponding to the positive number N and a second high frequency signal corresponding to the negative number N) corresponding to the positive number N and the negative number N, respectively. The signal frequencies of the first high-frequency signal corresponding to the positive number N and the second high-frequency signal corresponding to the negative number N are the sum of the carrier frequency and the frequency offset. In a time interval T (which may be greater than a second preset threshold, which may be set by self-definition, and in principle, the second preset threshold is set to be larger), a high-frequency counter in the frequency offset detection circuit is used to count the number of cycles of the first high-frequency signal and the second high-frequency signal, respectively, so as to obtain a first number of cycles corresponding to the first high-frequency signal and a second number of cycles corresponding to the second high-frequency signal.
First number of cycles C0T is the time interval, fc is the carrier frequency, and dN is the frequency offset corresponding to the corrected control value N.
Number of second cycles C1T is the time interval, fc is the carrier frequency, and dN is the frequency offset corresponding to the negative N of the corrected control value.
The difference between the first and second cycle numbers is 2 × T dN, corresponding to the frequency offset of the correction control value N
Applying the scale factor
And (4) showing.
For the signal to be corrected to be a signal related to 1Mbps bit streamWhen a frequency offset of 250KHz is generated, a control signal M with the amplitude of M is added to 250000 XN/(dN). The scale factor of the bit stream with 1Mbps signal to be corrected is
For the signal to be corrected related to 2Mbps bit stream, which needs to generate 500KHz frequency offset, a control signal M with amplitude M needs to be added, which is 500000 × N/(dN), and the scale factor of the signal to be corrected corresponding to the 2Mbps bit stream is 500000 × N/(dN)
According to some embodiments of the present invention, the calculation mode of calculating the scale factor of the signal to be corrected is described by taking the signal to be corrected as an example, which is related to the bit stream of 1Mbps and 2 Mbps:
when a signal to be corrected related to a bit stream of 1Mbps is corrected, the bit stream of 1Mbps is input into a GFSK low-pass filter in a frequency offset correction circuit, the output of the GFSK low-pass filter is the signal to be corrected, and the amplitude of the signal to be corrected is a correction control value N.
By a scaling factor of
And inputting the signal to be corrected to a multiplier for reduction, and using the reduction value as the input of the phase-locked loop frequency modulator.
When the corrected signal corresponds to a 1Mbps bit stream, the GFSK frequency offset value after the digital 1 PLL frequency modulator corresponding to the 1Mbps bit stream is 250 KHz. The GFSK frequency offset value after the phase-locked loop frequency modulator of digital 0 corresponding to the bit stream of 1Mbps is-250 KHz.
When a signal to be corrected of a 2Mbps bit stream is corrected, the 2Mbps bit stream is input into a GFSK low-pass filter in a frequency offset correction circuit, the output of the GFSK low-pass filter is the signal to be corrected, and the amplitude of the signal to be corrected is a correction control value N.
By a scaling factor of
And inputting the amplitude correction control value N as the signal to be corrected to a multiplier for reduction, and taking the reduction value as the input of the phase-locked loop frequency modulator.
When the corrected signal corresponds to a 2Mbps bit stream, the GFSK frequency offset value after the digital 1 PLL frequency modulator corresponding to the 2Mbps bit stream is 500 KHz. And when the bit stream of 2Mbps corresponds to the phase-locked loop frequency modulator of digital 0, the GFSK frequency offset value is-500 KHz.
It is worth noting that the model of the second alternative selector, the GFSK filter, the multiplier, the phase-locked loop frequency modulator, the high-frequency counter, the timer and the baseband processor (the single chip can be selected for use) in the correction device of the GFSK frequency deviation of the bluetooth low energy can be selected by user-defining, as long as the technical scheme in the embodiment of the present application can be realized, the embodiment of the present invention is not limited herein.
The embodiment of the utility model discloses a correcting unit of GFSK frequency deviation of bluetooth low energy, frequency deviation who treats the correction signal through frequency deviation detection circuitry and frequency deviation correction circuit rectifies, has avoided GFSK frequency deviation to deviate from the too big problem of frequency deviation value (like 250KHZ and 500KHZ) of standard regulation, has guaranteed bluetooth chip's normal work.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (5)
1. A correction device for GFSK frequency offset for bluetooth low energy, the correction device comprising: a frequency offset correction control circuit and a baseband processor connected to the frequency offset correction control circuit;
the frequency offset correction control circuit comprises a frequency offset detection circuit and a frequency offset correction circuit;
the frequency offset detection circuit and the frequency offset correction circuit are connected through a first alternative selector;
when the baseband processor takes a correction control value related to the amplitude of a signal to be corrected as the input of the first alternative selector, the frequency offset detection circuit outputs a scale factor of the correction control value;
the baseband processor takes the scale factor and the signal to be corrected as the input of the frequency offset correction circuit, and the frequency offset correction circuit corrects the GFSK frequency offset of the signal to be corrected based on the scale factor.
2. The apparatus for correcting GFSK frequency offset for bluetooth low energy according to claim 1, wherein the frequency offset detection circuit comprises: the device comprises a phase-locked loop frequency modulator, a high-frequency counter and a timer;
the high-frequency counter is respectively connected with the phase-locked loop frequency modulator and the timer;
the baseband processor takes a positive number N and a negative number N as correction control values as the input of the phase-locked loop frequency modulator respectively, and the phase-locked loop frequency modulator outputs a first high-frequency signal and a second high-frequency signal respectively;
in a time interval T, taking the first high-frequency signal and the second high-frequency signal as the input of the high-frequency counter, wherein the high-frequency counter counts the number of cycles of the first high-frequency signal and the second high-frequency signal respectively to obtain a first number of cycles corresponding to the first high-frequency signal and a second number of cycles corresponding to the second high-frequency signal;
the baseband processor determines a scaling factor for the signal to be corrected based on a standard frequency offset value for the signal to be corrected, the first number of cycles, the second number of cycles, a positive number N, and the time interval T.
3. The apparatus for correcting GFSK frequency offset of bluetooth low energy as claimed in claim 2, wherein the apparatus further comprises a memory, the memory is connected to the baseband processor, the time interval T and the correction control value are stored in the memory, and the correction control value is greater than a first preset threshold and the time interval T is greater than a second preset threshold.
4. The apparatus for correcting GFSK frequency offset of Bluetooth low energy according to claim 3, wherein the memory further comprises a storage area, in which the correction condition is stored;
the correction conditions include: the Bluetooth chip of the low-power-consumption Bluetooth is in cold start, or the temperature of the Bluetooth chip of the low-power-consumption Bluetooth meets the requirement of a correction range.
5. The apparatus for correcting GFSK frequency offset for bluetooth low energy as claimed in claim 3, wherein the memory further comprises a storage area having a positive number N stored therein, wherein N is 256.
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