WO2023082837A1 - Terminal chip, base station device, and bidirectional wireless communication system - Google Patents

Abstract

Embodiments of the present invention relate to the technical field of communications, and provide a terminal chip, a base station device, and a bidirectional wireless communication system. The terminal chip comprises: a backward linear frequency modulation scattering circuit and an ASK modulation receiving circuit; the backward linear frequency modulation scattering circuit is used for scattering a single-frequency carrier of a radio-frequency source so as to send a data packet to a base station; and the ASK modulation receiving circuit is used for receiving an ASK modulation signal from the base station. Bidirectional communication between a terminal and a base station is realized while maintaining the ultra-low power consumption performance of the terminal.

Description

Terminal chip, base station equipment and two-way wireless communication system technical field

The invention relates to the technical field of communication, in particular to a terminal chip, base station equipment and a two-way wireless communication system.

Background technique

The backscattering device used in LoRa scattering communication technology is an ultra-low power consumption device. However, as a terminal backscatter device, there is no way to receive LoRa signals. In this communication system, the terminal only sends signals but does not receive signals, and the base station only receives signals but does not send signals, which belongs to one-way communication. If a receiver for receiving LoRa signals is added to the terminal forcibly, the power consumption of the terminal will be greatly increased, and the ultra-low power consumption characteristics of LoRa scattering communication technology will be offset.

Contents of the invention

The purpose of the embodiment of the present invention is to provide a terminal chip, base station equipment and two-way wireless communication system, the terminal chip, base station equipment and two-way wireless communication system realize the two-way communication between the terminal and the base station, and at the same time maintain the ultra- low power performance.

In order to achieve the above object, an embodiment of the present invention provides a terminal chip, the terminal chip includes: a back chirp scattering circuit and an ASK modulation receiving circuit, the back chirp scattering circuit is used to scatter a single frequency carrier of a radio frequency source, To send data packets to the base station, the ASK modulation receiving circuit is used to receive the ASK modulation signal from the base station.

Preferably, the back chirp scattering circuit includes: a first digital baseband, a switch array and an impedance load array, wherein the first digital baseband is connected to the switch array for controlling the switches in the switch array The on/off combination of the switch array; the impedance load array is connected to the switch array, and is used to change the impedance value according to the on/off combination of the switches in the switch array, so as to change the magnitude of the transmitted chirp signal.

Preferably, the back chirp scattering circuit further includes: a first clock circuit connected to the first digital baseband and used to provide a reference clock for the first digital baseband.

Preferably, the ASK modulation receiving circuit includes: an ASK demodulation circuit, a hysteresis curve comparator and a second digital baseband, wherein the ASK demodulation circuit is used to filter out the high frequency component of the received ASK signal to obtain ASK envelope signal; the hysteresis curve comparator is connected to the ASK demodulation circuit for outputting a high/low level signal according to the amplitude of the ASK envelope signal; the second digital baseband is connected to the hysteresis The return curve comparator is connected to analyze and extract the ASK signal according to the high/low level signal.

Preferably, the ASK modulation receiving circuit further includes: a second clock circuit, connected to the second digital baseband, for providing a reference clock for the second digital baseband.

Preferably, the terminal chip further includes: a battery, configured to provide power for devices in the terminal.

Preferably, the terminal chip further includes: a terminal antenna connected to the switch array and the ASK demodulation circuit.

Preferably, different carrier frequencies are used for back chirp scattering and ASK modulation.

An embodiment of the present invention also provides a base station device, the base station device is based on the above-mentioned terminal chip, the base station device includes: a chirp receiving circuit and an ASK modulation transmitting circuit, and the chirp receiving circuit is used to receive the For a data packet, the ASK modulation transmitting circuit is used to transmit the ASK modulation signal.

Preferably, the chirp receiving circuit includes: a third digital baseband, a first mixer, a chirp signal synchronization unit, and a first amplifier, wherein the first amplifier is used to amplify the received chirp signal The chirp synchronization unit is connected to the first amplifier for synchronizing the received chirp signal with the local chirp signal; the first mixer is connected to the chirp synchronization unit, Used to mix the received chirp signal and the local chirp signal; the third digital baseband is connected to the first mixer for fast Fourier transform to complete the received chirp Signal demodulation.

Preferably, the ASK modulation transmission circuit includes: a fourth digital baseband, a digital-to-analog conversion unit, a second mixer, and a second amplifier, wherein the digital-to-analog conversion unit is connected to the fourth digital baseband for converting the digital signal of the fourth data baseband into an analog signal; the second mixer is used to mix the analog signal output by the digital-to-analog conversion unit with a local carrier signal; the second amplifier and the The second mixer is connected to amplify the mixed signal.

Preferably, the base station device further includes: a base station antenna connected to the first amplifier and the second amplifier.

An embodiment of the present invention also provides a two-way wireless communication system, the system includes: a radio frequency source, at least one terminal, and a base station, wherein the radio frequency source is used to transmit a single-frequency carrier; the terminal includes the above-mentioned terminal chip ; The base station includes the above-mentioned base station equipment.

Through the above technical solution, using the terminal chip, base station equipment and two-way wireless communication system provided by the present invention, an ASK modulation receiving circuit is added to the terminal to receive signals, realizing two-way communication between the terminal and the base station, and due to the ASK modulation receiving The characteristics of the circuit while maintaining the ultra-low power consumption performance of the terminal.

Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description.

Description of drawings

The accompanying drawings are used to provide a further understanding of the embodiments of the present invention, and constitute a part of the specification, and are used together with the following specific embodiments to explain the embodiments of the present invention, but do not constitute limitations to the embodiments of the present invention. In the attached picture:

Fig. 1 is a schematic structural diagram of a terminal chip provided by an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a back chirp scattering circuit provided by an embodiment of the present invention;

3 is a schematic structural diagram of an ASK modulation receiving circuit provided by an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of a terminal chip provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a base station device provided by an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a chirp receiving circuit provided by an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of an ASK modulation transmitting circuit provided by an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a base station device provided by another embodiment of the present invention;

Fig. 9 is a schematic structural diagram of a two-way wireless communication system provided by an embodiment of the present invention.

Explanation of reference signs

1-backward chirp scattering circuit; 2-ASK modulation receiving circuit;

11-first digital baseband; 12-switch array;

13-impedance load array; 14-first clock circuit;

21-ASK demodulation circuit; 22-hysteresis curve comparator;

23-second digital baseband; 24-second clock circuit;

3-battery; 4-terminal antenna;

5-Chirp FM receiving; 6-ASK modulation transmitting circuit;

51-the third digital baseband; 52-the first mixer;

53-linear frequency modulation signal synchronization unit; 54-first amplifier;

55-the third clock circuit; 61-the fourth digital baseband;

62-digital-to-analog conversion unit; 63-the second mixer;

64-the second amplifier; 65-the fourth clock circuit;

7- Base station antenna.

Detailed ways

The specific implementation manners of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation manners described here are only used to illustrate and explain the embodiments of the present invention, and are not intended to limit the embodiments of the present invention.

FIG. 1 is a schematic structural diagram of a terminal chip provided by an embodiment of the present invention. As shown in Figure 1, the terminal chip includes: a back chirp scattering circuit 1 and an ASK modulation receiving circuit 2, the back chirp scattering circuit 1 is used to scatter the single frequency carrier of the radio frequency source to send data packets to the base station , the ASK modulation receiving circuit 2 is used for receiving the ASK modulation signal from the base station.

Specifically, the radio frequency source transmits a single-frequency carrier, and the back-chirp scattering circuit 1 acts as a back-scattering device. Through back-scattering, data packets conforming to LoRa rules are transmitted to the base station, and the base station receives data. Although the power consumption of LoRa scattering communication technology is very low, it is a one-way communication. In the embodiment of the present invention, an ASK (Amplitude Shift Keying, Amplitude Shift Keying) modulation receiving circuit 2 is set to receive signals and ensure that the characteristics of low power consumption of the terminal remain unchanged. Preferably, the back chirp scattering and the ASK modulation use different carrier frequencies to avoid mutual interference and improve sensitivity.

The existing LoRa scattering technology must include LoRa-specific Whitenning scrambling, Hamming error correction coding, Interleaving interleaving and Gray coding. The backscattering technology is not only applicable to the LoRa system, but also applicable to the Sub-GHz wireless communication system (wireless communication system with a carrier frequency lower than 1 GHz) based on the self-defined chirp of the present invention. In the self-defined system, the encoding method is already Known, the design process can be greatly simplified, and there is no need to reverse engineer to crack the encoding method of the communication process.

FIG. 2 is a schematic structural diagram of a back chirp scattering circuit provided by an embodiment of the present invention. As shown in Figure 2, the back chirp scattering circuit 1 includes: a first digital baseband 11, a switch array 12 and an impedance load array 13, wherein the first digital baseband 11 is connected to the switch array 12 for To control the on/off combination of the switches in the switch array 12; the impedance load array 13 is connected to the switch array 12 for changing the impedance value according to the on/off combination of the switches in the switch array 12 , to change the magnitude of the transmitted chirp signal.

Specifically, in the embodiment of the present invention, the first digital baseband 11 is connected to the switch array 12 to realize the on/off combination of the switches in the switch array 12 controlled by the digital circuit, and the switch array 12 is connected to the impedance load array 13. The specific working method is as follows: Firstly, the switch array 12 is controlled by the first digital baseband 11. The advantage of using the array is that the signal amplitude of the backscattered chirp can generate multiple values, thereby reducing the influence of the third harmonic and the fifth harmonic. Then the switch array 12 can change the impedance load array 13 through different switch combinations to generate different impedance values, so as to change the internal impedance value of the chip, thereby changing the antenna reflection coefficient, so that the signal size of the antenna backscattering is controlled. The principle of antenna back reflection makes the time-domain multiplication of the multivalued signal controlled by the first digital baseband 11 and the received single-frequency signal of the RF source, thereby generating a new frequency component, which is also called a subcarrier. Linear frequency modulation can be realized by controlling the frequency value of the new frequency component or subcarrier to change linearly.

In addition, the back chirp scattering circuit 1 further includes: a first clock circuit 14 connected to the first digital baseband 11 for providing a reference clock for the first digital baseband 11 .

It can be seen from this embodiment that the back chirp scattering circuit 1 is not provided with high-power energy-consuming devices such as power amplifiers and mixers, and has the characteristics of ultra-low power consumption.

FIG. 3 is a schematic structural diagram of an ASK modulation receiving circuit provided by an embodiment of the present invention. As shown in Figure 3, the ASK modulation receiving circuit 2 includes: an ASK demodulation circuit 21, a hysteresis curve comparator 22 and a second digital baseband 23, wherein the ASK demodulation circuit 21 is used to filter out the received The high-frequency component of the ASK signal to obtain the ASK envelope signal; the hysteresis curve comparator 22 is connected to the ASK demodulation circuit 21 for outputting a high/low level signal according to the amplitude of the ASK envelope signal; The second digital baseband 23 is connected to the hysteresis curve comparator 22 for analyzing and extracting the ASK signal according to the high/low level signal.

Specifically, in the embodiment of the present invention, the format of the ASK signal may be a UHF RFID standard, for example, the ISO18000-6C protocol. The basic principle of the ASK demodulation circuit 21 is to filter out the high-frequency components of ASK and extract the envelope of the ASK signal. The ASK demodulation circuit 21 of this embodiment filters the received ASK signal out of the carrier to obtain an envelope signal. The ASK demodulation circuit 21 is connected to the hysteresis curve comparator 22. The hysteresis curve comparator 22 plays the role of comparing signals. The hysteresis curve can effectively eliminate misoperations. Only the ASK envelope signal whose signal amplitude is greater than the threshold value can make the comparator output Flip to high. Thus, the hysteresis curve comparator 22 outputs a digital signal to the second digital baseband 23 . The second digital baseband 23 analyzes and extracts the ASK signal. Specifically, it can be understood that the second digital baseband 23 analyzes the form of the received high/low level signal, for example, the duration of the high/low level and when it changes from high level to low level or from low level turn high.

In addition, the ASK modulation receiving circuit 2 also includes: a second clock circuit 24, connected to the second digital baseband 23, for providing a reference clock for the second digital baseband 23, the second clock circuit 24 and the first The clock circuit 14 may be the same clock circuit or different clock circuits.

In this embodiment, it can be seen that the ASK demodulation circuit 21 is also not provided with power amplifiers, mixers and other high-power energy-consuming devices, and has the characteristics of ultra-low power consumption. The power consumption of the transmission circuit of the common chirp terminal is about 10 mA, while the power consumption of the transmission circuit of the backscatter chirp terminal in this embodiment is about 0.2 mA. The power consumption of the receiving circuit of an ordinary linear modulation terminal is about 1 mA, and the power consumption of the receiving circuit of the terminal in this embodiment is about 0.001 mA.

FIG. 4 is a schematic structural diagram of a terminal chip provided by an embodiment of the present invention. As shown in FIG. 4 , the terminal chip further includes: a battery 3 for providing power for devices in the terminal. The battery 3 facilitates ultra-low power long-distance communication. If the battery 3 is not used but the infinite energy harvesting device is used to provide power, although the characteristics of ultra-low power consumption are maintained, the bottleneck of the communication distance will be the threshold of the infinite energy harvesting device, so that the communication distance is greatly shortened. As mentioned above, the present embodiment greatly reduces the power consumption value, and the lower power consumption value means that the battery 3 has a longer lifespan.

The terminal chip further includes: a terminal antenna 4 connected to the switch array 12 and the ASK demodulation circuit 21 . The terminal antenna 4 is used for sending and receiving signals.

Fig. 5 is a schematic structural diagram of a base station device provided by an embodiment of the present invention. As shown in Figure 5, the base station equipment is based on the above-mentioned terminal chip, and the base station equipment includes: a chirp receiving circuit 5 and an ASK modulation transmitting circuit 6, and the chirp receiving circuit 5 is used to receive the data packet , the ASK modulation transmitting circuit 6 is configured to transmit the ASK modulation signal.

Specifically, corresponding to the above-mentioned terminal chip, the base station equipment has a chirp receiving circuit 5 for receiving data packets sent back to the chirp scattering circuit 1, and has an ASK modulation transmitting circuit 6 for sending ASK modulation signals. The base station equipment may be in the form of a chip, or in the form of a discrete circuit.

Fig. 6 is a schematic structural diagram of a chirp receiving circuit provided by an embodiment of the present invention. As shown in FIG. 6, the chirp receiving circuit 5 includes: a third digital baseband 51, a first mixer 52, a chirp signal synchronizing unit 53, and a first amplifier 54, wherein the first amplifier 54 is used for The received chirp signal is amplified; the chirp signal synchronization unit 53 is connected to the first amplifier 54 for synchronizing the received chirp signal with the local chirp signal; the first frequency mixing The device 52 is connected with the chirp synchronizing unit 53 for mixing the received chirp signal and the local chirp signal; the third digital baseband 51 is connected with the first mixer 52 for using To perform fast Fourier transform to complete the demodulation of the received chirp signal.

In addition, the chirp receiving circuit 5 further includes: a third clock circuit 55 connected to the third digital baseband 51 for providing a reference clock for the third digital baseband 51 .

Specifically, firstly, the first amplifier 54 amplifies the received chirp signal, and the first amplifier 54 may be a low noise amplifier. The received chirp signal and the local chirp signal are then synchronized by the chirp signal synchronizing unit 53, and then the first mixer 52 makes the local chirp signal and the received chirp signal mixed, and then in the third The fast Fourier transform calculation is performed in the digital baseband 51 to obtain the characteristics of the chirp signal and realize the demodulation of the chirp signal.

Fig. 7 is a schematic structural diagram of an ASK modulation transmitting circuit provided by an embodiment of the present invention. As shown in FIG. 7, the ASK modulation transmitting circuit 6 includes: a fourth digital baseband 61, a digital-to-analog conversion unit 62, a second mixer 63, and a second amplifier 64, wherein the digital-to-analog conversion unit 62 and the The fourth digital baseband 61 is connected to convert the digital signal of the fourth data baseband into an analog signal; the second mixer 63 is used to combine the analog signal output by the digital-to-analog conversion unit 62 with the local carrier The signals are mixed; the second amplifier 64 is connected to the second mixer 63 for amplifying the mixed signals.

In addition, the ASK modulation transmitting circuit 6 also includes: a fourth clock circuit 65, connected to the fourth digital baseband 61, for providing a reference clock for the fourth digital baseband 61. Similarly, the fourth clock circuit 65 It can be the same clock circuit as the third clock circuit 55, or it can be a different clock circuit.

Specifically, the function of the ASK modulation transmitting circuit 6 is to generate an ASK modulation signal controlled by the fourth digital baseband 61 and amplify the signal through the second amplifier 64, which may be a power amplifier. First, the fourth data baseband generates a digital signal, which is converted into an analog signal by the digital-to-analog conversion unit 62 (DAC), then mixed with the local carrier signal by the second mixer 63, and finally amplified by the second amplifier 64 and then Send out to complete ASK modulation.

Fig. 8 is a schematic structural diagram of a base station device provided by another embodiment of the present invention. As shown in FIG. 8 , the base station device further includes: a base station antenna 7 connected to the first amplifier 54 and the second amplifier 64 . The base station antenna 7 is used for sending and receiving signals.

Fig. 9 is a schematic structural diagram of a two-way wireless communication system provided by an embodiment of the present invention. As shown in Figure 9, the system includes: a radio frequency source, at least one terminal, and a base station, wherein the radio frequency source is used to transmit a single frequency carrier; the terminal includes the terminal chip described above; the base station includes the above The base station equipment.

Specifically, it can be understood that the two-way wireless communication system may include multiple terminals, such as three terminals as shown in FIG. Examples are similar and will not be repeated here.

It should also be noted that the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes Other elements not expressly listed, or elements inherent in the process, method, commodity, or apparatus are also included. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

The above are only examples of the present application, and are not intended to limit the present application. For those skilled in the art, various modifications and changes may occur in this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims (13)

1. A terminal chip, characterized in that the terminal chip comprises:

   A back chirp scattering circuit and an ASK modulation receiving circuit, the back chirp scattering circuit is used to scatter the single-frequency carrier of the radio frequency source to send data packets to the base station, and the ASK modulation receiving circuit is used to receive signals from the base station ASK modulated signal.
2. The terminal chip according to claim 1, wherein the back chirp scattering circuit comprises:

   A first digital baseband, an array of switches, and an array of impedance loads, wherein,

   The first digital baseband is connected to the switch array, and is used to control the on/off combination of the switches in the switch array;

   The impedance load array is connected to the switch array, and is used to change the impedance value according to the on/off combination of the switches in the switch array, so as to change the magnitude of the transmitted chirp signal.
3. The terminal chip according to claim 2, wherein the back chirp scattering circuit further comprises:

   The first clock circuit is connected to the first digital baseband and used to provide a reference clock for the first digital baseband.
4. The terminal chip according to claim 2, wherein the ASK modulation receiving circuit comprises:

   ASK demodulation circuit, hysteresis curve comparator and second digital baseband, wherein,

   The ASK demodulation circuit is used to filter out the high frequency component of the received ASK signal to obtain the ASK envelope signal;

   The hysteresis curve comparator is connected to the ASK demodulation circuit for outputting a high/low level signal according to the amplitude of the ASK envelope signal;

   The second digital baseband is connected to the hysteresis curve comparator for analyzing and extracting the ASK signal according to the high/low level signal.
5. The terminal chip according to claim 4, wherein the ASK modulation receiving circuit further comprises:

   The second clock circuit is connected to the second digital baseband and used to provide a reference clock for the second digital baseband.
6. The terminal chip according to claim 1, wherein the terminal chip further comprises:

   a battery for providing power to devices in the terminal.
7. The terminal chip according to claim 4, wherein the terminal chip further comprises:

   a terminal antenna connected to the switch array and the ASK demodulation circuit.
8. The terminal chip according to claim 1, wherein different carrier frequencies are used for back chirp scattering and ASK modulation.
9. A base station device, characterized in that the base station device is based on the terminal chip according to any one of claims 1-7, and the base station device includes:

   A linear frequency modulation receiving circuit and an ASK modulation transmitting circuit, the linear frequency modulation receiving circuit is used for receiving the data packet, and the ASK modulation transmitting circuit is used for transmitting the ASK modulation signal.
10. The base station device according to claim 9, wherein the chirp receiving circuit comprises:

    The third digital baseband, the first mixer, the chirp synchronization unit and the first amplifier, wherein,

    The first amplifier is used to amplify the received chirp signal;

    The chirp signal synchronizing unit is connected to the first amplifier, and is used for synchronizing the received chirp signal and the local chirp signal;

    The first mixer is connected to the chirp synchronizing unit for mixing the received chirp signal with the local chirp signal;

    The third digital baseband is connected to the first mixer for fast Fourier transform to complete the demodulation of the received chirp signal.
11. The base station device according to claim 10, wherein the ASK modulation transmitting circuit comprises:

    A fourth digital baseband, a digital-to-analog conversion unit, a second mixer, and a second amplifier, wherein,

    The digital-to-analog conversion unit is connected to the fourth digital baseband, and is used to convert the digital signal of the fourth data baseband into an analog signal;

    The second mixer is used to mix the analog signal output by the digital-to-analog conversion unit with a local carrier signal;

    The second amplifier is connected to the second mixer for amplifying the mixed signal.
12. The base station device according to claim 11, wherein the base station device further comprises:

    A base station antenna connected to the first amplifier and the second amplifier.
13. A two-way wireless communication system, characterized in that the system includes:

    A radio frequency source, at least one terminal and a base station, wherein,

    The radio frequency source is used to transmit a single frequency carrier;

    The terminal includes the terminal chip according to any one of claims 1-8;

    The base station includes the base station device according to any one of claims 9-12.

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