CN115333580A - Bluetooth device based on Sub-GHz frequency band and implementation method - Google Patents
Bluetooth device based on Sub-GHz frequency band and implementation method Download PDFInfo
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Abstract
The application discloses a Bluetooth device based on a Sub-GHz frequency band and an implementation method thereof. The radio frequency transceiving unit comprises a local oscillator circuit, a mixer circuit, a transceiving port and an analog-to-digital conversion circuit, wherein the mixer circuit can convert an input signal into an intermediate frequency, and the analog-to-digital conversion circuit performs analog-to-digital conversion on the intermediate frequency signal so as to enable the baseband processing unit to process the intermediate frequency signal; and the local oscillation circuit converts the signal output by the modulator into an analog signal of a preset frequency band through a phase-locked loop and a Sigma-Delta modulator and outputs the analog signal through a receiving and transmitting port. The bluetooth device is through above-mentioned structure, with bluetooth transceiver signal for the not easy decay frequency channel signal of predetermineeing to the problem that has the side effect in the solution optimization bluetooth connection process.
Description
Technical Field
The application relates to the field of Internet of things, in particular to a Bluetooth device based on a Sub-GHz frequency band and an implementation method.
Background
With the rise of the concepts of the internet of things and smart home, the bluetooth technology has the characteristics of low cost and low power consumption, and is widely applied to communication among different devices in the internet of things. The typical internet of things is wirelessly connected with electronic equipment with built-in Bluetooth chips around, such as intelligent lamps, cameras and even intelligent household appliances, by arranging a Bluetooth gateway. After receiving a bluetooth signal sent by the electronic device, the bluetooth gateway converts data information contained in the signal into a WIFI or ethernet signal, and sends the WIFI or ethernet signal to a device connected to the ethernet, such as a router.
The Bluetooth signals transmitted by the Bluetooth technology are electromagnetic wave signals with a frequency band of 2.4GHz, the transmission modes of the electromagnetic wave signals comprise diffraction and penetration, and when the wavelength of the electromagnetic wave is compared with the size of an obstacle, the electromagnetic wave signals are transmitted in a diffraction mode; when the wavelength of the electromagnetic wave is far smaller than the size of the obstacle, the electromagnetic wave propagates in a penetrating way. According to the wave speed of the electromagnetic waves, the wavelength of the electromagnetic wave signals with the frequency band of 2.4GHz is about 12cm, and when the Bluetooth gateway and the electronic equipment connected with the Bluetooth gateway are arranged indoors, due to the fact that the number of indoor walls is large and the thickness of the walls is usually larger than 12cm, obstacles exist in the Bluetooth signal propagation process and diffraction is difficult to perform. If the signal is transmitted in a penetrating mode, the intensity of the Bluetooth signal is greatly attenuated when the signal penetrates one wall, and the transmission of data information is not facilitated. Typically, the reception of bluetooth signals can be optimized by increasing the transmission power, increasing the sensitivity of the bluetooth gateway to reception, or by using mesh technology.
However, in practical applications, increasing the transmission power will increase the power consumption of the device and increase the cost; the receiving sensitivity of the Bluetooth gateway is improved, so that the transmission rate is reduced, and the method is not suitable for high throughput or scenes needing quick feedback; the grid technology is that all devices can be connected with the Bluetooth gateway by realizing communication between adjacent devices, the design difficulty is high, and the problem of low transmission rate also exists because communication is needed between different devices. Therefore, it is necessary to provide a technical solution to avoid the problem of poor optimization effect and side effect during the process of optimizing bluetooth connection.
Disclosure of Invention
The application provides a Bluetooth device based on a Sub-GHz frequency band and an implementation method thereof, which are used for solving the problems of poor optimization effect and side effect in the process of optimizing Bluetooth connection.
According to a first aspect of the embodiments of the present invention, there is provided a bluetooth device based on Sub-GHz band, including a controller, a communication bus, a baseband processing unit, a modem, and a radio frequency transceiving unit, wherein: the controller is connected with the baseband processing unit through a communication bus; the modem comprises a modulator and a demodulator, wherein the input end of the modulator is connected with the baseband processing unit, and the output end of the demodulator is connected with the baseband processing unit; the radio frequency transceiving unit comprises a local oscillator circuit, a mixer circuit, a transceiving port and an analog-to-digital conversion circuit, wherein the mixer circuit comprises two mixers connected in parallel, and the mixer circuit is connected with the transceiving port in series; the local oscillator circuit and the analog-to-digital conversion circuit are respectively connected with the two frequency mixers; the output end of the analog-to-digital conversion circuit is connected with the input end of the demodulator; the local oscillation circuit comprises a phase-locked loop and a Sigma-Delta modulator, and the phase-locked loop is connected with the output end of the modulator through the input end of the Sigma-Delta modulator; the Sigma-Delta modulator is used for carrying out digital-to-analog conversion on an output signal of the modulator output end; and the phase-locked loop is used for converting the output signal of the Sigma-Delta modulator to a preset frequency band.
The radio frequency receiving and transmitting unit can receive and transmit radio frequency signals of a specific frequency band, so that the Bluetooth device avoids the situation that the transmitted 2.4GHz radio frequency signals are attenuated greatly after penetrating through a wall and cannot be received by other Bluetooth devices. The local oscillation circuit in the radio frequency transceiving unit can modulate the baseband signal, convert the baseband signal after preliminary modulation into an analog signal format and convert the frequency to a preset frequency band for output.
Optionally, the preset frequency band is a Sub-GHz frequency band. The preset frequency band is a Sub-GHz frequency band, the wavelength of an electromagnetic wave signal in the frequency band is longer, diffraction and transmission can be realized in an indoor environment, and attenuation in the signal transmission process is reduced.
Optionally, the radio frequency transceiver unit further includes a power amplifying circuit, and an output power amplifier and an input power amplifier are arranged in the power amplifying circuit; the input end of the output power amplifier is connected with the output end of the phase-locked loop, and the output end of the output power amplifier is connected with the transceiving port in series; the output power amplifier is used for amplifying the power of the output signal of the phase-locked loop; the output end of the input power amplifier is connected with the mixer circuit in series, and the input end of the input power amplifier is connected with the transceiving port in series; the input power amplifier is used for amplifying the power of the radio frequency signal received by the transceiving port. The power amplifying circuit can respectively amplify the power of the input radio frequency signal and the output radio frequency signal. The output radio frequency signal is subjected to power amplification, so that the insufficient power of the signal can be prevented, and the signal can still be detected and received after being attenuated in the propagation process; the power amplification is carried out on the input radio frequency signal, so that the information in the signal can be extracted as much as possible, and the information loss is avoided.
Optionally, the radio frequency transceiver unit further includes a transceiver switch, one end of the transceiver switch is connected in series with the transceiver port, the other end of the transceiver switch is connected to the power amplification circuit, and the transceiver switch is used to communicate the transceiver port with the output power amplifier or communicate the transceiver port with the input power amplifier. The receiving and transmitting switch can control the Bluetooth device to receive or transmit signals, so that the Bluetooth device can realize the separation of receiving and transmitting through only one port, and the signal interference is avoided.
Optionally, the phase-locked loop circuit includes a voltage-controlled oscillator, a loop filter, a phase frequency detector, and a multi-mode frequency divider, where: the multi-modulus frequency divider is connected with the output end of the Sigma-Delta modulator; the phase frequency detector is connected with the multi-mode frequency divider in series, and the phase frequency detector is connected with the input end of the voltage-controlled oscillator in series through the loop filter; and the output end of the voltage-controlled oscillator is respectively connected with the output power amplifier and the multi-mode frequency divider. The voltage-controlled oscillator can convert the received signals into high-frequency signals to be output, one part of the output high-frequency signals are output to the multi-mode frequency divider, and the other part of the output high-frequency signals are output to the output power amplifier to be amplified and output.
Optionally, the phase frequency detector is provided with two input ends, and the phase-locked loop further includes a reference signal end; one input end of the phase frequency detector is connected with the multi-mode frequency divider, and the other input end of the phase frequency detector is connected with the reference signal end; the reference signal terminal is configured to output a reference signal having a frequency of the preset frequency band. The reference signal and the signal output by the multi-mode frequency divider are compared through the phase frequency detector, so that the frequency of the output signal of the phase-locked loop can be limited to the preset frequency band.
Optionally, the phase-locked loop further includes a charge pump, and the charge pump is connected in series between the phase frequency detector and the loop filter; the charge pump is used for gaining the signal output by the phase frequency detector so as to eliminate stray and quantization noise.
Optionally, the radio frequency transceiver unit further includes a filter circuit, and the filter circuit is disposed between the mixer circuit and the analog-to-digital conversion circuit to limit a bandwidth of an output signal of the mixer circuit.
According to a second aspect of the embodiments of the present invention, a bluetooth implementation method based on a Sub-GHz band is provided, which is applied to any one of the above bluetooth devices, and includes a transmission implementation method and a reception implementation method: the method for realizing the transmission comprises the following steps: controlling a baseband processing unit to generate a baseband signal and carrying out GFSK modulation to obtain a modulation signal; carrying out Sigma-Delta modulation on the modulation signal to generate a radio frequency signal in an analog signal format; frequency converting the radio frequency signal to a preset frequency band; the radio frequency signals located in the preset frequency band are sent through broadcasting; the receiving implementation method comprises the following steps: receiving the signal in the preset frequency band to obtain a received signal; frequency converting the received signal to an intermediate frequency; performing analog-to-digital conversion on the frequency-converted received signal to generate a processed signal in a digital signal format; and performing GFSK demodulation on the processed signal, and sending the processed signal to a baseband processing unit for processing.
Optionally, the preset frequency band is a Sub-GHz frequency band.
According to the technical scheme, the bluetooth device based on the Sub-GHz band and the implementation method thereof are provided. The radio frequency transceiving unit comprises a local oscillator circuit, a mixer circuit, a transceiving port and an analog-to-digital conversion circuit, wherein the mixer circuit can convert an input signal into an intermediate frequency, and the analog-to-digital conversion circuit can perform analog-to-digital conversion on the intermediate frequency signal so as to facilitate the processing of the baseband processing unit; the local oscillation circuit comprises a phase-locked loop and a Sigma-Delta modulator, and can convert signals output by the modem into analog signals of a preset frequency band and output the analog signals through a receiving and transmitting port. The bluetooth device is through setting up above-mentioned structure for the signal that the bluetooth produced and handled becomes the difficult decay predetermines the frequency channel signal, produces speed reduction, cost increase scheduling problem when avoiding optimizing the bluetooth and connecting.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a Sub-GHz band-based bluetooth device in an embodiment of the present application;
fig. 2 is a schematic structural diagram of an rf transceiver unit according to an embodiment of the present application;
FIG. 3 is a flowchart of a method for implementing a Sub-GHz band-based Bluetooth transmission in an embodiment of the present application;
fig. 4 is a flowchart of a method for implementing bluetooth reception based on Sub-GHz band in this embodiment.
Illustration of the drawings: 100-a radio frequency transceiver unit; 110-a transceiver port; 120-a mixer circuit; 130-analog-to-digital conversion circuit; 140-local oscillator circuitry; 150-a power amplification circuit; 160-a transmit receive switch; 170-a filter circuit; 200-a modem; 300-baseband processing unit; 400-a communication bus; 500-a controller; 121-a mixer; 141-phase locked loop; a 142-Sigma-Delta modulator; 151-output power amplifier; 152-an input power amplifier; 210-a modulator; 220-a demodulator; 1410-a voltage controlled oscillator; 1411-a loop filter; 1412-phase frequency detector; 1413-reference signal terminal; 1414 — a multi-modulus divider; 1415-charge pump.
Detailed Description
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of apparatus and methods consistent with certain aspects of the application, as recited in the claims.
The Bluetooth technology is a short-distance wireless communication technology, and can realize convenient, quick, flexible, safe, low-cost and low-power-consumption data communication and voice communication among different devices. Due to popularization of the internet of things and smart home concepts, the bluetooth technology is widely applied to various devices due to the advantages, so that the bluetooth technology can be wirelessly connected with other devices.
Because the distance of wireless communication realized through the bluetooth is shorter, the scheme of using the bluetooth to carry out equipment interconnection is usually applied to indoor environment, for example, through built-in bluetooth module in electronic equipment such as different household appliances or lamps and lanterns, realizes the remote control of indoor electronic equipment, on this basis, the star type network deployment's mode is connected commonly used, sets up a bluetooth gateway as the node promptly, and other built-in bluetooth module's equipment all carries out wireless connection with bluetooth gateway. However, many obstacles which cannot be avoided in the signal propagation process exist in the indoor environment, such as walls, large furniture and the like. In some embodiments, the bluetooth technology uses 2.4GHz band electromagnetic wave signals for transmission, and the wavelength of the electromagnetic wave signals in the band is about 12cm according to the wave velocity and frequency, which is less than the thickness of a wall in an indoor environment. Furthermore, according to the characteristics of electromagnetic waves, when the electromagnetic waves encounter obstacles while propagating in space, there are two propagation methods: penetration and diffraction, wherein when the wavelength of the electromagnetic wave is compared with the size of the obstacle, the electromagnetic wave is generally transmitted in a diffraction mode; when the electromagnetic wave wavelength is much smaller than the size of the obstacle, it is generally transmitted by means of penetration. However, because the wavelength of the bluetooth signal in the 2.4GHz band is much smaller than the thickness of the indoor wall, in an indoor environment, if the bluetooth signal encounters obstacles such as a wall and the like in the propagation process, the bluetooth signal needs to be propagated in a penetrating manner.
And because barriers such as walls are solid, and the walls contain metal supports, electromagnetic wave signals can be greatly attenuated in the walls, so that the quality of wireless connection is influenced. In order to realize the interaction among different devices, the Bluetooth arranged in the device has the functions of transmitting and receiving, and at the moment, if the Bluetooth connection is optimized by adopting a mode of increasing the power of a Bluetooth transmitting end, the Bluetooth power consumption can be increased, and the use cost of the Bluetooth is increased. If the optimization method for increasing the sensitivity of the receiving end is adopted, the device can receive smaller signals through the Bluetooth, so that the situation that electromagnetic wave signals cannot be received through the Bluetooth after being attenuated is avoided, but the data rate needs to be reduced when the sensitivity of the receiving end is increased, the response time delay of the device is possibly longer due to the reduction of the data rate, and the device is not suitable for application scenes with high throughput. The mesh technology is to perform optimization of bluetooth connection in a mode of networking through pairwise interconnection between different devices, but the design difficulty is high in a scene with many bluetooth devices, and because different devices are required to transfer signals, the data rate can be reduced, and the mesh technology is not suitable for an application scene with high throughput.
To avoid the problems of power consumption increase and speed reduction during the process of optimizing bluetooth connection, refer to fig. 1, which is a schematic structural diagram of a Sub-GHz band-based bluetooth device in an embodiment of the present application. As shown in fig. 1, the present application provides a Sub-GHz band-based bluetooth device, which includes a controller 500, a communication bus 400, a baseband processing unit 300, a modem 200, and a radio frequency transceiving unit 100. In the embodiment of the present application, the bluetooth device may be a bluetooth chip including the above components. It should be noted that, the bluetooth apparatus in the embodiment of the present application is built in different electronic devices, and the different electronic devices only affect data information contained in the bluetooth signal sent by the bluetooth apparatus, and do not affect physical properties of the bluetooth signal.
The controller 500 is connected to the baseband processing unit 300 through a communication bus 400. The controller 500 is configured to control the bluetooth apparatus to perform bluetooth signal transceiving through the baseband processing unit 300. In some embodiments, the controller 500 may be implemented by a single chip, and bluetooth protocol stack information is stored in the single chip so as to facilitate connection between different devices.
The modem 200 includes a modulator 210 and a demodulator 220, an input end of the modulator 210 is connected to the baseband processing unit 300, and an output end of the demodulator 220 is connected to the baseband processing unit 300, and specifically, the modem 200 is configured to decode a received bluetooth signal into a signal that can be processed by the baseband processing unit 300, and preliminarily modulate a baseband signal sent by the baseband processing unit 300 into an output signal. It should be noted that, in the embodiment of the present application, the modulation mode adopted by the bluetooth apparatus is GFSK modulation, that is, gaussian frequency shift keying modulation, and the spectrum width of a baseband signal can be limited, so as to achieve the purpose of reducing power consumption.
The radio frequency transceiver unit 100 includes a local oscillation circuit 140, a mixer circuit 120, a transceiver port 110, and an analog-to-digital conversion circuit 130, where the mixer circuit 120 includes two parallel mixers, and the mixer circuit 120 is connected in series with the transceiver port 110. The local oscillator circuit 140 and the analog-to-digital conversion circuit 130 are respectively connected to the two mixers, and an output terminal of the analog-to-digital conversion circuit 130 is connected to an input terminal of the demodulator. It should be noted that, in practical use, the transceiving port 110 needs an external antenna to receive and/or transmit bluetooth signals, and in some embodiments, an antenna having transceiving function is used as the external antenna of the bluetooth device.
In this embodiment, when the bluetooth device receives signals transmitted by other bluetooth devices, the bluetooth device first collects bluetooth signals through an antenna as input signals, and then reduces the input signals to an intermediate frequency through the cooperation of a mixer and the local oscillator circuit 140, where the intermediate frequency is 1MHz in this embodiment. Finally, the analog signal format of the input signal is converted into a digital format by the analog-to-digital conversion circuit 130, so as to facilitate the demodulation by the demodulator 220 and the processing and analysis by the baseband processing unit 300.
The local oscillation circuit 140 comprises a phase-locked loop circuit 141 and a Sigma-Delta modulator 142, wherein the phase-locked loop circuit 141 is connected with the output end of the modulator 210 through the input end of the Sigma-Delta modulator 142; the Sigma-Delta modulator 142 is used for performing digital-to-analog conversion on the output signal of the output end of the modulator 210, and the phase-locked loop is used for frequency converting the output signal of the Sigma-Delta modulator to a preset frequency band. On this basis, the radio frequency transceiver unit 100 can receive and transmit radio frequency signals of a specific frequency band, so that the bluetooth device avoids the situation that the transmitted 2.4GHz radio frequency signals are attenuated greatly after penetrating through the wall and cannot be received by other bluetooth devices.
In some embodiments of the present application, the predetermined frequency band is a Sub-GHz frequency band. The Sub-GHz frequency band is a Sub-GHz frequency band, specifically a frequency range of 27MHz to 960MHz, the wavelength of an electromagnetic wave signal in the frequency band is longer, the electromagnetic wave signal can be diffracted and transmitted in an indoor environment, attenuation in the signal transmission process is reduced, even if the electromagnetic wave signal needs to be transmitted in a penetrating mode in the transmission process, the attenuation degree of the signal relative to the 2.4GHz frequency band is also small, and acquisition by other equipment is facilitated.
Specifically, the frequency of the radio frequency signal transmitted and received by the bluetooth device can be represented as:
f rf_subghz ＝27MHz+N*ChannelSpacing
wherein N is the channel number of the radio frequency signal in Sub-GHz; channelspacing is the channel interval, and is specific, and the channel interval is the same with the intermediate frequency, in this application embodiment, when the intermediate frequency is 1MHz, the channel interval also is 1MHz. In theory, the channel interval and the intermediate frequency can be freely defined, for example, set to 0.5MHz, etc., but since the channel interval adopted in the general bluetooth protocol is 1MHz, changing the channel interval requires changing both the bluetooth protocol stack in the controller 500 and the baseband processing unit 300, and therefore, in some embodiments of the present application, the channel interval and the intermediate frequency are set to 1MHz.
In order to enable the bluetooth apparatus to better process the transmitted and received signals, the rf transceiver unit 100 further includes a power amplifier circuit 150, and the power amplifier circuit 150 is provided with an output power amplifier 151 and an input power amplifier 152. The input terminal of the output power amplifier 151 is connected to the output terminal of the pll loop 141, and the output terminal of the output power amplifier 151 is connected in series to the transceiver port 110. Specifically, the output power amplifier 151 may be a power amplifier PA, which is capable of performing power gain on the rf signal output by the phase-locked loop 141, so that the transmitted signal has higher power and is easily received by other bluetooth devices.
The input power amplifier 152 is disposed between the transceiver port 110 and the mixer circuit 120, an output terminal of the input power amplifier 152 is connected in series with the mixer circuit 120, and an input terminal of the input power amplifier 152 is connected in series with the transceiver port 110. In some embodiments of the present application, the input power amplifier 152 may be a low noise power amplifier LNA, which is capable of eliminating noise generated by amplifying a signal while amplifying the power of a radio frequency signal received by the transceiving port 110, and improving the signal-to-noise ratio of the signal received by the transceiving port 110, compared to a PA, so as to avoid signal distortion caused by the noise generated in the amplifying process when the power of the received signal is low.
In this application, since one transceiving port 110 is used for transceiving signals, in order to avoid interference between received signals and transmitted signals, in some embodiments, the rf transceiving unit 110 further includes a transceiving switch 160, one end of the transceiving switch 160 is connected in series with the transceiving port 110, and the other end of the transceiving switch 160 is connected to the power amplifier circuit 150, and the transceiving switch 160 is configured to connect the transceiving port 110 to the output power amplifier 151 or connect the transceiving port 110 to the input power amplifier 152.
It should be noted that the manner of transmitting and receiving signals through one transceiving port 110 is called time division duplex, that is, different time slots are divided in a period of time, and the transceiving port 110 only performs one task of receiving or transmitting in the same time slot. Specifically, the time slot width may be set by itself, and the number of the receiving and transmitting time slots may not be 1, that is, the number of the receiving time slots and the number of the transmitting time slots in a period of time may be different, and the specific ratio may be manually set by the setting position of the bluetooth device.
In some embodiments of the present application, in order to ensure that reception and transmission do not generate interference, a protection timeslot exists when a reception timeslot and a transmission timeslot are switched, and in the protection timeslot, the bluetooth device does not receive a signal nor transmit a signal, thereby ensuring that reception and transmission are not interfered.
In some embodiments of the present application, the transceiver switch 160 may be a single-pole double-throw switch, or a PIN diode, and specifically, what kind of switch is used, which is not limited in the present application, and the switching function of the bluetooth device for receiving and transmitting may be implemented.
As shown in fig. 2, in some embodiments, the pll loop 141 includes a voltage controlled oscillator 1410, a loop filter 1411, a phase frequency detector 1412, and a multi-modulus divider 1414. The multi-modulus frequency divider 1414 is connected with the output end of the Sigma-Delta modulator 142, and the multi-modulus frequency divider 1414 receives the modulation signal in the analog signal format output by the Sigma-Delta modulator 142, so that the multi-modulus frequency divider 1414 can separate signals in different frequency bands from the modulation signal, and avoid interference.
And the phase frequency detector 1412 is connected with the multi-mode frequency divider 1414 in series, the phase frequency detector 1412 is connected with the input end of the voltage-controlled oscillator 1410 in series through a loop filter 1411, and the output end of the voltage-controlled oscillator 1410 is connected with the output power amplifier 151 and the multi-mode frequency divider 1414 respectively. The phase frequency detector 1412 can control the voltage-controlled oscillator 1410 to frequency-convert and output the signals by comparing the phase difference between the signals. The loop filter 1411 can filter out high-frequency error components in the signal output by the phase frequency detector 1412, thereby improving the anti-interference performance of the phase-locked loop 141.
It should be noted that the multi-modulus divider 1414 can also receive a part of the output signal of the voltage-controlled oscillator 1410, and this part of the output signal can be used as a feedback signal of the pll loop 141 and sent to the phase frequency detector 1412 through the multi-modulus divider 1414, so that the pll loop 141 can lock the frequency of the output signal of the voltage-controlled oscillator 1410.
In order to enable the pll loop 141 to limit the output of the vco 1410 to a predetermined frequency band, in some embodiments, the phase frequency detector 1412 has two input terminals, and the pll loop 141 further includes a reference signal terminal 1413, where the reference signal terminal 1413 is capable of providing a reference signal with a frequency in the predetermined frequency band. One input terminal of the phase frequency detector 1412 is connected to the multi-modulus divider 1414 and the other input terminal of the phase frequency detector 1412 is connected to the reference signal terminal 1413. The phase frequency detector 1412 can use the signal output by the multi-modulus frequency divider 1414 as an input signal, compare the phase difference with a reference signal, generate a frequency conversion control signal for the signal output by the multi-modulus frequency divider 1414, and compare the phase difference of the output signal of the voltage-controlled oscillator 1410, so that the frequency of the output signal of the voltage-controlled oscillator 1410 is a preset frequency.
In some embodiments of the present application, the reference signal output by the reference signal terminal 1413 can also provide a reference clock, so as to prevent interference from the input and the output of the transceiving port 110 due to time error.
In some embodiments, the pll loop 141 further includes a charge pump 1415, the charge pump 1415 is connected in series between the phase frequency detector 1412 and the loop filter 1411, and the charge pump 1415 is capable of performing a gain on a signal output by the phase frequency detector 1412 to remove spurs and quantization noise, so as to generate a control signal for the voltage-controlled oscillator 1410, and the voltage-controlled oscillator 1410 is controlled by the control signal to convert the signal to a preset frequency and output the signal.
In order to enable the baseband processing unit 300 to process the received signal more quickly and without interference during the signal reception process of the bluetooth device, the rf transceiver unit 100 further includes a filter circuit 170, and the filter circuit 170 is disposed between the mixer circuit 120 and the analog-to-digital conversion circuit 130 to limit the bandwidth of the output signal of the mixer circuit 120. It should be noted that, the bandwidth is a frequency bandwidth, and the filter circuit 170 can limit the frequency bandwidth of the output signal thereof, so that the spurious interference in a non-local frequency band in the signal mixed by the mixer circuit 120 is filtered. In some embodiments, the filter in the filter circuit 170 may be a band pass filter, which suppresses signals below or above the limited range by limiting the frequency band of the signals, thereby eliminating clutter interference.
Based on the above bluetooth device, as shown in fig. 3 to fig. 4, the present application further provides a bluetooth implementation method based on Sub-GHz band, which is applied to any of the above bluetooth devices, and since the radio frequency transceiving of the bluetooth devices is integrated, the bluetooth implementation method also includes a transmission implementation method and a reception implementation method.
The transmission implementation method comprises the following steps: controlling the baseband processing unit 300 to generate a baseband signal and perform GFSK modulation to obtain a modulation signal; carrying out Sigma-Delta modulation on the modulation signal to generate a radio frequency signal in an analog signal format; frequency converting the radio frequency signal to a preset frequency band; and sending the radio frequency signals in the preset frequency band by broadcasting.
The receiving implementation method comprises the following steps: receiving a signal in a preset frequency band to obtain a received signal; frequency-converting the received signal to an intermediate frequency; performing analog-to-digital conversion on the frequency-converted received signal to generate a processed signal in a digital signal format; the processed signal is GFSK demodulated and sent to the baseband processing unit 300 for processing. In this embodiment, the intermediate frequency is 1MHz.
It should be noted that, in some embodiments, in order to ensure that the bluetooth output signal can be diffracted in an indoor environment, the preset frequency band is a Sub-GHz frequency band, and the specific frequency range is between 27MHz and 960 MHz.
As can be seen from the above technical solutions, the present application provides a bluetooth device based on Sub-GHz band, where the bluetooth device includes a controller 500, a communication bus 400, a baseband processing unit 300, a modem 200, and a radio frequency transceiver unit 100, the controller 500 is connected to the baseband processing unit 300 through the communication bus 400, and the radio frequency transceiver unit 100 is connected to the baseband processing unit 300 through the modem 200. The radio frequency transceiver unit 100 includes a local oscillator circuit 140, a mixer circuit 120, a transceiver port 110, and an analog-to-digital conversion circuit 130, where the mixer circuit 120 can convert an input signal into an intermediate frequency, and the analog-to-digital conversion circuit 130 can perform analog-to-digital conversion on the intermediate frequency signal so as to facilitate processing by the baseband processing unit 300; the local oscillation circuit 140 includes a phase-locked loop 141 and a Sigma-Delta modulator 142, and can convert the signal output by the modem 200 into an analog signal of a predetermined frequency band and output the analog signal through the transceiving port 110. The Bluetooth device is provided with the structure, so that signals generated and processed by Bluetooth are changed into preset frequency band signals which are not easy to attenuate, and the problems of speed reduction, cost increase and the like caused by optimized Bluetooth connection are avoided.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments that can be extended by the solution according to the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (10)
1. The utility model provides a bluetooth device based on Sub-GHz frequency channel which characterized in that, includes controller, communication bus, baseband processing unit, modem and radio frequency transceiver unit, wherein:
the controller is connected with the baseband processing unit through a communication bus;
the modem comprises a modulator and a demodulator, wherein the input end of the modulator is connected with the baseband processing unit, and the output end of the demodulator is connected with the baseband processing unit;
the radio frequency transceiving unit comprises a local oscillator circuit, a mixer circuit, a transceiving port and an analog-to-digital conversion circuit, wherein the mixer circuit comprises two mixers connected in parallel, and the mixer circuit is connected with the transceiving port in series; the local oscillator circuit and the analog-to-digital conversion circuit are respectively connected with the two frequency mixers; the output end of the analog-to-digital conversion circuit is connected with the input end of the demodulator;
the local oscillation circuit comprises a phase-locked loop and a Sigma-Delta modulator, and the phase-locked loop is connected with the output end of the modulator through the input end of the Sigma-Delta modulator; the Sigma-Delta modulator is used for carrying out digital-to-analog conversion on an output signal of the output end of the modulator; and the phase-locked loop is used for converting the output signal of the Sigma-Delta modulator to a preset frequency band.
2. The Sub-GHz band-based bluetooth device of claim 1, wherein the predetermined frequency band is a Sub-GHz band.
3. The Sub-GHz band-based bluetooth device according to claim 2, wherein the radio frequency transceiver unit further comprises a power amplifier circuit, and an output power amplifier and an input power amplifier are disposed in the power amplifier circuit;
the input end of the output power amplifier is connected with the output end of the phase-locked loop, and the output end of the output power amplifier is connected with the transceiving port in series; the output power amplifier is used for amplifying the power of the output signal of the phase-locked loop;
the output end of the input power amplifier is connected with the mixer circuit in series, and the input end of the input power amplifier is connected with the transceiving port in series; the input power amplifier is used for amplifying the power of the radio frequency signal received by the transceiving port.
4. The Sub-GHz band-based bluetooth device according to claim 3, wherein the rf transceiver unit further comprises a transceiver switch, one end of the transceiver switch is connected in series with the transceiver port, and the other end of the transceiver switch is connected to the power amplifier circuit, and the transceiver switch is configured to connect the transceiver port to the output power amplifier or connect the transceiver port to the input power amplifier.
5. The Sub-GHz band-based bluetooth device of claim 3, wherein the phase-locked loop comprises a voltage-controlled oscillator, a loop filter, a phase frequency detector, and a multi-modulus divider, wherein:
the multi-modulus frequency divider is connected with the output end of the Sigma-Delta modulator;
the phase frequency detector is connected with the multi-mode frequency divider in series, and is connected with the input end of the voltage-controlled oscillator in series through the loop filter;
and the output end of the voltage-controlled oscillator is respectively connected with the output power amplifier and the multi-mode frequency divider.
6. The Sub-GHz band-based Bluetooth device of claim 5, wherein the phase frequency detector has two input terminals, and the phase-locked loop further comprises a reference signal terminal;
one input end of the phase frequency detector is connected with the multi-mode frequency divider, and the other input end of the phase frequency detector is connected with the reference signal end; the reference signal terminal is configured to output a reference signal having a frequency of the preset frequency band.
7. The Sub-GHz band-based bluetooth device according to claim 5, wherein the phase-locked loop further comprises a charge pump connected in series between the phase frequency detector and the loop filter; the charge pump is used for gaining the signal output by the phase frequency detector so as to eliminate stray and quantization noise.
8. The Sub-GHz band-based bluetooth device according to claim 2, wherein the radio frequency transceiver unit further comprises a filter circuit disposed between the mixer circuit and the analog-to-digital conversion circuit to limit a bandwidth of an output signal of the mixer circuit.
9. A Bluetooth realization method based on Sub-GHz frequency band is applied to the Bluetooth device in any one of claims 1-8, and is characterized by comprising a transmission realization method and a receiving realization method:
the method for realizing the transmission comprises the following steps: controlling a baseband processing unit to generate a baseband signal and carrying out GFSK modulation to obtain a modulation signal; carrying out Sigma-Delta modulation on the modulation signal to generate a radio frequency signal in an analog signal format; frequency converting the radio frequency signal to a preset frequency band; the radio frequency signals located in the preset frequency band are sent through broadcasting;
the receiving implementation method comprises the following steps: receiving the signal in the preset frequency band to obtain a received signal; frequency converting the received signal to an intermediate frequency; performing analog-to-digital conversion on the frequency-converted received signal to generate a processing signal in a digital signal format; and performing GFSK demodulation on the processed signal, and sending the processed signal to a baseband processing unit for processing.
10. The method of claim 9, wherein the predetermined frequency band is a Sub-GHz frequency band.
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