WO2023208025A1

WO2023208025A1 - Communication method and communication apparatus

Info

Publication number: WO2023208025A1
Application number: PCT/CN2023/090787
Authority: WO
Inventors: 李强
Original assignee: 华为技术有限公司
Priority date: 2022-04-29
Filing date: 2023-04-26
Publication date: 2023-11-02

Abstract

Provided in the embodiments of the present application are a communication method and a communication apparatus. The communication method comprises: sending a first signal and first data in a frequency division multiplexing manner, wherein the first signal is used for assisting a receiving device in performing frequency offset correction on a local oscillation signal which is generated by the receiving device; and sending a second signal and second data in the frequency division multiplexing manner, wherein the second signal is used for instructing the receiving device to enter a connected state; a first sending parameter of the first signal and a second sending parameter of the second signal are respectively configured; the type of the first sending parameter is the same as that of the second sending parameter, and the first sending parameter comprises: a first frequency protection interval between the first signal and the first data, a modulation order of the first signal, and/or a transmission power of the first signal; and the second sending parameter comprises: a second frequency protection interval between the second signal and the second data, a modulation order of the second signal, and/or a transmission power of the second signal. In this way, starting from a sending end, the signal demodulation performance of a receiving end is prevented from being affected.

Description

Communication method and communication device

This application claims priority to the Chinese patent application filed with the China Patent Office on April 29, 2022, with application number 202210474065.4 and the application title "A Receiver", the entire content of which is incorporated into this application by reference.

This application claims priority to the Chinese patent application filed with the China Patent Office on July 8, 2022, with application number 202210800943.7 and the application name "Communication Method and Communication Device", the entire content of which is incorporated into this application by reference.

Technical field

The embodiments of the present application relate to the field of communication technology, and more specifically, to a communication method and a communication device.

Background technique

In wireless communication systems, signals are radiated into space through antennas in the form of electromagnetic waves. Before transmitting a signal, the sending device generally modulates the signal and moves the spectrum of the baseband signal to a higher carrier frequency through upconversion, so that the communication system can work in the assigned channel. For the receiving device, the receiving device must downconvert and demodulate the signal sent by the sending device in order to obtain the information transmitted by the sending device. Among them, demodulation is the reverse process of modulation. Different modulation methods have different demodulation methods. For example, if the signal modulates the information on the carrier frequency through frequency shift keying (FSK) modulation, then the receiving device needs to obtain the transmitted signal through the frequency of the received signal during the demodulation process. information.

Since the baseband signal sent by the transmitting device uses radio frequency after up-conversion, the received signal needs to be down-converted before the receiving device demodulates the received signal. Generally, the receiving device can mix the local oscillator signal generated by the receiving device and the received signal to complete down-conversion processing of the received signal. However, affected by factors such as the stability of the crystal oscillator of the receiving equipment and the surrounding environment, the frequency of the local oscillator signal generated by the receiving equipment often deviates from the ideal frequency. In this way, the baseband signal obtained after the receiving equipment demodulates the received signal There will be errors, which will seriously affect the demodulation performance of the receiving equipment.

Contents of the invention

Embodiments of the present application provide a communication method and a communication device. The communication method can start from the transmitting side and avoid affecting the signal demodulation performance on the receiving device side.

In a first aspect, a communication method is provided. The communication method includes: using frequency division multiplexing to send a first signal and first data. The first signal is used to assist a receiving device in processing the signal generated by the receiving device. The local oscillator signal performs frequency offset correction; a frequency division multiplexing method is used to send a second signal and second data, and the second signal is used to instruct the receiving device to enter the connected state; wherein, the first part of the first signal The transmission parameter and the second transmission parameter of the second signal are configured separately, the first transmission parameter and the second transmission parameter are of the same type, and the first transmission parameter includes at least one of the following: the first transmission parameter The first frequency guard interval between a signal and the first data, the modulation order of the first signal, the transmission power of the first signal, and the second transmission parameter includes at least one of the following: second letter The second frequency guard interval between the signal and the second data, the modulation order of the second signal, and the transmission power of the second signal.

In this technical solution, the first signal and the second signal are transmitted according to respectively configured transmission parameters of the first signal and transmission parameters of the second signal. In this way, starting from the transmitting side, the impact on the signal demodulation performance on the receiving device side is avoided.

In addition, because the first signal is used by the receiving device to correct the frequency offset of the local oscillator signal generated by it, and the second signal is used to instruct the receiving device to enter the connected state, the receiving device first uses the first signal to correct the local oscillator signal generated by it. The frequency offset of the signal is corrected, and then the second signal is demodulated and entered into the connection state. In this way, when the receiving device demodulates the second signal, since the receiving device has corrected the frequency offset of the local oscillator signal it generates, the receiving device can accurately demodulate the second signal. Furthermore, the demodulation performance of the receiving device will not be seriously affected.

With reference to the first aspect, in some implementations of the first aspect, the first signal adopts a differential frequency modulation modulation method, and/or the second signal adopts a differential frequency modulation modulation method.

Because the time interval between the two time units before and after is very short, even if there is a residual frequency offset in the local oscillator signal generated by the receiving device, the residual frequency offset of the local oscillator signal generated in the two time units before and after can be considered to be the same. Therefore, starting from the transmitting end, the first signal or the second signal is modulated by differential FM. In this way, the receiving device subtracts the frequencies of the first signal or the second signal in the two time units before and after (that is, differential FM Modulation method), which can offset the residual frequency offset of the local oscillator signal generated by the receiving device, thereby not affecting the demodulation performance of the receiving device.

With reference to the first aspect, in some implementations of the first aspect, before transmitting the second signal and the second data using frequency division multiplexing, the communication method further includes: The first frequency difference mapped by every N bits in the sequence modulates the second signal; where, N=log ₂ M, where M is the modulation order of the second signal; the first The frequency difference is the frequency difference between the second signals in two adjacent time units; the frequency of the second signal in the i-th time unit is f(i)=mod[f(i-1)+Δf (i), B1], △f(i) is the first frequency difference between the i-th second signal and the (i-1)-th second signal in the sequence of second signals, B1 is the preset first bandwidth value, and i is an integer greater than 1.

With reference to the first aspect, in some implementations of the first aspect, before transmitting the first signal and the first data using frequency division multiplexing, the communication method further includes: The second frequency difference mapped by every P bits in the sequence modulates the first signal; where, P=log ₂ Q, and the Q is the modulation order of the first signal; the second The frequency difference is the frequency difference between the first signals in two adjacent time units; the frequency of the first signal in the jth time unit is f(j)=mod[f(j-1)+Δf ₁ (j), B2], the △f ₁ (j) is the second frequency of the j-th first signal and the (j-1)-th first signal in the sequence of the first signals. Difference, the B2 is the preset second bandwidth value, and the j is an integer greater than 1.

With reference to the first aspect, in some implementations of the first aspect, the first frequency guard interval is greater than the second frequency guard interval; and/or the modulation order of the first signal is lower than the first frequency guard interval. The modulation order of the two signals, or the first signal is a single frequency signal, or the modulation order of the first signal is 2; and/or the transmission power of the first signal is higher than the The transmit power of the second signal.

Since the first signal is used to assist the receiving device in correcting the frequency offset of the local oscillator signal generated by the receiving device, and the local oscillator signal generated by the receiving device has a frequency offset, the frequency between the first signal and the first data is The guard interval (relative to the frequency guard interval between the second signal and the second data) is set larger to prevent the normally transmitted first data on the adjacent frequency band from entering the receiving device to correct the frequency offset of the local oscillator signal it generates. circuit to avoid affecting the frequency offset correction process of the local oscillator signal generated by the receiving device. Further, since the second signal is used to instruct the receiving device to enter the connected state, and after the receiving device performs frequency offset correction on the local oscillator signal generated by it, the obtained The frequency offset of the local oscillator signal is reduced. Therefore, the frequency guard interval between the second signal and the second data (relative to the frequency guard interval between the first signal and the first data) is set smaller, that is, it can This avoids the interference of the second data normally transmitted on the adjacent frequency band to the demodulation of the second signal by the receiving device. At the same time, the smaller guard interval improves the utilization of system resources and saves the cost of frequency band resources.

Since the first signal is used to assist the receiving device in correcting the frequency offset of the local oscillator signal generated by the receiving device, and the existence of the frequency offset of the local oscillator signal generated by the receiving device will cause the demodulation performance of the first signal to be degraded by the receiving device. Therefore, the modulation order of the first signal (relative to the modulation order of the second signal) is set smaller, so that each symbol (symbol) of the first signal carries less information, and the receiving device changes the frequency The smaller the quantity converted to amplitude. In this way, within the same interval, the smaller the number of amplitudes, the greater the distance between amplitudes, and thus the better the demodulation performance of the first signal by the receiving device.

Further, the second signal is used to instruct the receiving device to enter the connected state. After the receiving device performs frequency offset correction on the local oscillator signal generated by it, the frequency offset of the obtained local oscillator signal is reduced. Therefore, the signal solution of the receiving device is The performance of the modulation will be improved, so that the modulation order of the second signal (relative to the modulation order of the first signal) can be set larger, so that it can transmit more information.

Since the first signal is used to assist the receiving device in correcting the frequency offset of the local oscillator signal generated by the receiving device, and the existence of the frequency offset of the local oscillator signal generated by the receiving device will cause the demodulation performance of the first signal to be degraded by the receiving device. Therefore, a higher transmit power (relative to the transmit power of the second signal) can be used to transmit the first signal, so that the receiving device can obtain the first signal with stronger signal strength and receive the signal based on the first signal with stronger signal strength. The modulation information of the first signal is obtained, thereby improving the demodulation performance of the first signal by the receiving device.

The second signal is used to instruct the receiving device to enter the connected state. After the receiving device corrects the frequency offset of the local oscillator signal generated by it, the frequency offset of the obtained local oscillator signal is reduced. Therefore, the sending device does not need to use an excessively high transmitter. Power, using lower transmit power (relative to the transmit power of the first signal) to transmit the second signal, the receiving device can obtain higher demodulation performance for the second signal, thereby reducing the power overhead of the transmitting device.

In a second aspect, a communication method is provided. The communication method includes: sending a first signal, the first signal being used to assist the receiving device in correcting the frequency offset of the local oscillator signal generated by the receiving device, and the first signal is used to correct the frequency offset of the local oscillator signal generated by the receiving device. The first signal adopts the modulation method of differential frequency modulation; the second signal is sent, the second signal is used to instruct the receiving device to enter the connection state, and the second signal adopts the modulation method of differential frequency modulation.

Because the time interval between the two time units before and after is very short, even if there is a residual frequency offset in the local oscillator signal generated by the receiving device, the residual frequency offset of the local oscillator signal generated in the two time units before and after can be considered to be the same. Therefore, the transmitting end uses differential FM modulation to modulate the first signal or the second signal. In this way, the receiving device subtracts the frequencies of the first signal or the second signal in the two time units before and after (that is, the differential FM modulation method) , can offset the residual frequency offset of the local oscillator signal generated by the receiving device, thereby not affecting the demodulation performance of the receiving device.

With reference to the second aspect, in some implementations of the second aspect, before the sending the first signal, the communication method further includes: according to the first P bits mapped in the sequence of the first signal. Two frequency differences are used to modulate the first signal; where, P = log ₂ Q, and the Q is the modulation order of the first signal; the second frequency difference is the frequency difference between two adjacent time units. The frequency difference between the first signals; the frequency of the first signal in the jth time unit f(j)=mod[f(j-1)+Δf ₁ (j), B2], the Δ f ₁ (j) is the second frequency difference between the j-th first signal and the (j-1)-th first signal in the sequence of first signals, and B2 is the preset second Bandwidth value, j is an integer greater than 1.

With reference to the second aspect, in some implementations of the second aspect, before sending the second signal, the communication The method further includes: modulating the second signal according to the first frequency difference mapped by every N bits in the sequence of the second signal; wherein, N=log ₂ M, and the M is the first frequency difference. The modulation order of the two signals; the first frequency difference is the frequency difference between the second signals in two adjacent time units; the frequency of the second signal of i time units f(i)=mod [f(i-1)+Δf(i),B1], Δf(i) is the i-th second signal and the (i-1)-th second signal in the sequence of the second signal The first frequency difference between the two signals, B1 is the preset first bandwidth value, and i is an integer greater than 1.

In a third aspect, a communication method is provided. The communication method includes: using a differential frequency modulation modulation method to modulate a second signal. The second signal is used to assist a receiving device in processing a local oscillator generated by the receiving device. The signal is corrected for frequency offset, and the second signal is also used to instruct the receiving device that the receiving device performs frequency offset correction on the local oscillator signal generated by the receiving device and then enters the connected state; and sends the modulated second signal. Signal.

Because the time interval between the two time units before and after is very short, even if there is a residual frequency offset in the local oscillator signal generated by the receiving device, the residual frequency offset of the local oscillator signal generated in the two time units before and after can be considered to be the same. Therefore, starting from the transmitting end, the second signal is modulated by differential FM. In this way, the receiving device can subtract the frequencies of the second signal in the two time units before and after (that is, the differential FM modulation method). The residual frequency offset of the generated local oscillator signal is canceled so as not to affect the demodulation performance of the receiving device.

Combined with the third aspect, in some implementations of the third aspect, the modulation method using differential frequency modulation to modulate the second signal includes: mapping each N bits in the sequence of the second signal The first frequency difference is used to modulate the second signal; where, N=log ₂ M, the M is the modulation order of the second signal; the first frequency difference is two adjacent time units The frequency difference between the second signals within (i) is the first frequency difference between the i-th second signal and the (i-1)-th second signal in the sequence of second signals, and B1 is the preset first bandwidth value , i is an integer greater than 1.

For example, in an implementable manner, the communication method may be executed by the access network device, or may also be executed by a chip or circuit used in the access network device. In another implementable manner, the communication method may be executed by a terminal device, or may also be executed by a chip or circuit used in the terminal device or in the terminal device.

The technical effects of any possible implementation method in the third aspect can be referred to the technical effects of the corresponding implementation method in the second aspect, and will not be described again here.

Exemplarily, in an implementable manner, the communication method described in any implementable manner of the first to third aspects may be executed by the access network device, or may also be executed by the access network device. Chip or circuit execution in networked equipment. In another implementable manner, the communication method described in any one of the implementable manners of the first to third aspects can also be executed by a terminal device, or can also be performed by a chip used in the terminal device. or circuit execution.

In a fourth aspect, a communication device is provided. The communication device includes: a transceiver unit configured to send a first signal and first data in a frequency division multiplexing manner. The first signal is used to assist the receiving device in transmitting the received data. The local oscillator signal generated by the receiving device performs frequency offset correction; the transceiver unit is also used to send a second signal and second data in a frequency division multiplexing manner, and the second signal is used to instruct the receiving device to enter Connected state; wherein, the first transmission parameter of the first signal and the second transmission parameter of the second signal are configured separately, the first transmission parameter and the second transmission parameter are of the same type, and the The first transmission parameter includes at least one of the following: a first frequency guard interval between the first signal and the first data, a modulation order of the first signal, and a transmission power of the first signal, so The second transmission parameter includes at least one of the following: a second frequency guard interval between the second signal and the second data, a modulation order of the second signal, and a transmission power of the second signal.

Exemplarily, in an implementable manner, the communication device may be an access network device or an access network device in the access network device. chip or circuit. In another implementable manner, the communication device may be a terminal device or a chip or circuit in the terminal device.

With reference to the fourth aspect, in some implementations of the fourth aspect, the first signal adopts a differential frequency modulation modulation method, and/or the second signal adopts a differential frequency modulation modulation method.

In conjunction with the fourth aspect, in some implementations of the fourth aspect, the communication device further includes: a processing unit configured to map the first frequency difference according to every N bits in the sequence of the second signal, Modulate the second signal; where, N=log ₂ M, where M is the modulation order of the second signal; the first frequency difference is the second signal in two adjacent time units The frequency difference between the The first frequency difference between the i-th second signal and the (i-1)-th second signal in the sequence of second signals, where B1 is a preset first bandwidth value, and i is greater than 1 integer.

In conjunction with the fourth aspect, in some implementations of the fourth aspect, the communication device further includes: a processing unit configured to map a second frequency difference according to each P bits in the sequence of the first signal, Modulate the first signal; where, P = log ₂ Q, the Q is the modulation order of the first signal; the second frequency difference is the first signal in two adjacent time units The frequency difference between them; the frequency f(j) of the first signal in the jth time unit=mod[f(j-1)+Δf ₁ (j), B2], the Δf ₁ (j ) is the second frequency difference between the j-th first signal and the (j-1)-th first signal in the sequence of first signals, and B2 is the preset second bandwidth value, so Said j is an integer greater than 1.

With reference to the fourth aspect, in some implementations of the fourth aspect, the first frequency guard interval is greater than the second frequency guard interval; and/or the modulation order of the first signal is lower than the first frequency guard interval. The modulation order of the two signals, or the first signal is a single frequency signal, or the modulation order of the first signal is 2; and/or the transmission power of the first signal is higher than the The transmit power of the second signal.

The technical effects of any possible implementation method in the fourth aspect can be referred to the technical effects of the corresponding implementation methods in the fourth aspect, and will not be described again here.

In a fifth aspect, a communication device is provided. The communication device includes: a transceiver unit configured to send a first signal. The first signal is used to assist a receiving device in performing frequency offset on a local oscillator signal generated by the receiving device. Correction, the first signal adopts differential frequency modulation modulation method; the transceiver unit is also used to send a second signal, the second signal is used to instruct the receiving device to enter the connected state, and the second signal adopts differential frequency modulation. FM modulation method.

For example, in an implementable manner, the communication device may be an access network device or a chip or circuit in the access network device. In another implementable manner, the communication device may be a terminal device or a chip or circuit in the terminal device.

In conjunction with the fifth aspect, in some implementations of the fifth aspect, the communication device further includes: a processing unit configured to map a second frequency difference according to each P bits in the sequence of the first signal, Modulate the first signal; where, P = log ₂ Q, the Q is the modulation order of the first signal; the second frequency difference is the first signal in two adjacent time units The frequency difference between them; the frequency f(j) of the first signal in the jth time unit=mod[f(j-1)+Δf ₁ (j), B2], the Δf ₁ (j ) is the second frequency difference between the j-th first signal and the (j-1)-th first signal in the sequence of first signals, and B2 is the preset second bandwidth value, so Said j is an integer greater than 1.

In conjunction with the fifth aspect, in some implementations of the fifth aspect, the communication device further includes: a processing unit configured to map the first frequency difference according to every N bits in the sequence of the second signal, Modulate the second signal; where, N=log ₂ M, where M is the modulation order of the second signal; the first frequency difference is the second signal in two adjacent time units The frequency difference between the The i-th second signal in the sequence of second signals is the same as the (i-1)-th a first frequency difference of the second signal, the B1 is a preset first bandwidth value, and i is an integer greater than 1.

The technical effects of any possible implementation method in the fifth aspect can be referred to the technical effects of the corresponding implementation methods in the fifth aspect, and will not be described again here.

In a sixth aspect, a communication device is provided. The communication device includes: a transceiver unit configured to modulate a second signal using a differential frequency modulation modulation method. The second signal is used to assist a receiving device in processing the receiving device. The local oscillator signal generated by the device is corrected for frequency offset, and the second signal is also used to instruct the receiving device that the receiving device performs frequency offset correction on the local oscillator signal generated by the receiving device and then enters the connected state; the transceiver The unit is also configured to send the modulated second signal.

In conjunction with the sixth aspect, in some implementations of the sixth aspect, the communication device further includes: a processing unit configured to map the first frequency difference according to every N bits in the sequence of the second signal, Modulate the second signal; where, N=log ₂ M, where M is the modulation order of the second signal; the first frequency difference is the second signal in two adjacent time units The frequency difference between the The first frequency difference between the i-th second signal and the (i-1)-th second signal in the sequence of second signals, where B1 is a preset first bandwidth value, and i is greater than 1 integer.

The technical effects of any possible implementation method in the sixth aspect can be referred to the technical effects of the corresponding implementation method in the third aspect, and will not be described again here.

Exemplarily, in an implementable manner, the communication device described in any implementable manner of the fourth to sixth aspects may be an access network device or a chip or circuit in the access network device. . In another implementable manner, the communication device described in any implementable manner of the fourth to sixth aspects may be a terminal device or a chip or circuit in the terminal device.

In a seventh aspect, a communication device is provided, including: one or more processors; a memory; and one or more computer programs. Wherein, one or more computer programs are stored in the memory, and the one or more computer programs include instructions. When the instruction is executed by the communication device, the communication device is caused to execute the communication method in the possible implementation of any one of the above-mentioned first to third aspects.

In an eighth aspect, a computer program product containing instructions is provided. When the computer program product is run on a communication device, the communication device causes the communication device to perform any of the possible implementations of the first to third aspects. communication method.

In a ninth aspect, a computer-readable storage medium is provided, and the storage medium may be non-volatile. The storage medium includes instructions that, when run on the communication device, cause the communication device to perform the communication method in the possible implementation of any one of the above-mentioned first to third aspects.

In a tenth aspect, a chip is provided, including at least one processor and an interface circuit. The interface circuit is used to provide program instructions or data to the at least one processor. The at least one processor is used to execute the program instructions. , to implement the communication method in the possible implementation of any one of the above first to third aspects.

In an eleventh aspect, a communication system is provided, including a communication device and a receiving device. Wherein, the communication device is used to perform the communication method in the possible implementation of any one of the above-mentioned first to third aspects.

Description of the drawings

FIG. 1 is a schematic diagram of the architecture of an example communication system suitable for embodiments of the present application.

Figure 2 is a schematic diagram of the relationship between the amplitude and time of the FSK signal.

Figure 3 is a schematic diagram of another example of the relationship between the amplitude and time of the FSK signal.

Figure 4 is a schematic structural diagram of an example of non-coherent FSK receiving equipment.

Figure 5 is a schematic structural diagram of an example FM-AM converter.

Figures 6 and 7 are schematic diagrams of the frequency-amplitude conversion curve of the FM-AM converter respectively.

Figure 8 is a schematic flow chart of an example communication method provided by an embodiment of the present application.

FIG. 9 is a schematic diagram of a first signal, a first data, a second signal and a second data sent by a sending device according to an embodiment of the present application.

FIG. 10 is a schematic diagram of a frequency-amplitude conversion curve of an FM-AM converter provided by an embodiment of the present application.

Figure 11 is a schematic flow chart of another communication method provided by an embodiment of the present application.

Figure 12 is a schematic structural diagram of an example device provided by the embodiment of the present application.

Figure 13 is a schematic structural diagram of another example device provided by the embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

In order to facilitate understanding of the embodiments of the present application, the following explanations are made before introducing the embodiments of the present application.

First, in the embodiment of this application, "instruction" may include direct instruction and indirect instruction, and may also include explicit instruction and implicit instruction. The information indicated by a certain signal (such as the first signal described below) is called information to be indicated. In the specific implementation process, there are many ways to indicate the information to be indicated. For example, but not limited to, the information to be indicated can be directly indicated. Indication information, such as the information to be indicated itself or the index of the information to be indicated, etc. The information to be indicated may also be indirectly indicated by indicating other information, where there is an association relationship between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while other parts of the information to be indicated are known or agreed in advance. For example, the indication of specific information can also be achieved by means of a pre-agreed (for example, protocol stipulated) arrangement order of each piece of information, thereby reducing the indication overhead to a certain extent.

Second, in the embodiments shown below, the first, second and various numerical numbers are only used to distinguish them for convenience of description and are not used to limit the scope of the embodiments of the present application. For example, distinguish between different signals, branches, etc.

Third, the “plurality” mentioned in the embodiments of this application refers to two or more.

The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: global system for mobile communications (GSM) system, code division multiple access (code division multiple access, CDMA) system, wideband code division multiple access (CDMA) system, wideband code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (time division duplex, TDD), universal mobile telecommunication system (UMTS), global interoperability for microwave access (WiMAX) communication system, the future fifth generation (5th generation, 5G) system or new radio (new radio, NR), etc.

In order to facilitate understanding of the embodiments of the present application, a communication system suitable for the method provided by the embodiments of the present application is first described in detail with reference to FIG. 1 . FIG. 1 shows a schematic diagram of a communication system 100 suitable for the method provided by the embodiment of the present application.

In one example, as shown in Figure 1, the communication system 100 may include at least one access network device, such as a base station (gNB) and a satellite station in the 5G system as shown in Figure 1; the communication system 100 may also include at least one terminal Equipment, such as user equipment (UE) 1 to UE 9 shown in Figure 1 . Access network equipment and each terminal equipment can communicate through wireless links. For example, the access network device can send configuration information to the terminal device, and the terminal device can send uplink data to the access network device based on the configuration information; for another example, the access network device can send downlink data to the terminal device. Therefore, the gNB and UEs 1 to UE6 in Figure 1 can form a communication system; the satellite station and UEs 7 to UE 9 in Figure 1 can also form a communication system. In addition, base stations and satellite stations are connected to core network equipment in different ways, and data can be sent to each other between base stations, satellite stations and core network equipment. In this architecture, there can be multiple satellite stations or multiple base stations, and the satellite stations can also serve UEs similar to UE 1 to UE6. This application does not limit this. Each communication device, such as a base station, a satellite station or UE 1 to UE 9, may be configured with multiple antennas, which may include at least one transmitting antenna for transmitting signals and at least one receiving antenna for receiving signals. In addition, each communication device additionally includes a transmitter chain and a receiver chain. Those of ordinary skill in the art can understand that they may include multiple components related to signal transmission and reception (such as processors, modulators, multiplexers). , demodulator, demultiplexer or antenna, etc.). Therefore, the base station and the UEs 11 to UE 6 can communicate through the multi-antenna technology, and the satellite station and the UEs 7 to UE 9 can communicate through the multi-antenna technology.

In another example, the terminal devices in the communication system 100, such as UE4 to UE6, may also constitute a communication system. For example, the links between UE 5 and UE4 and UE6 respectively may be called sidelinks. For example, UE 5 can control UE 4 and UE6 to execute corresponding instructions, which is not limited in this application.

It should also be understood that Figure 1 is only a simplified schematic diagram for ease of understanding. The communication system 100 may also include other access network equipment or other terminal equipment, which are not shown in Figure 1 .

It should be understood that the access network device in the wireless communication system can be any device with wireless transceiver functions. The equipment includes but is not limited to: evolved NodeB (evolved NodeB, eNB or eNodeB), wireless network controller (radio network controller, RNC), Node B (Node B, NB), base station controller (base station controller, BSC) ), base transceiver station (BTS), home base station (e.g., home evolved NodeB, or home Node B, HNB), base band unit (BBU), wireless fidelity (wireless fidelity, WIFI) system The access point (AP), wireless relay node, wireless backhaul node, transmission point (TP) or transmission and reception point (TRP), etc., can also be 5G, such as , NR, a gNB in the system, or a transmission point (TRP or TP), one or a group (including multiple antenna panels) of antenna panels of a base station in a 5G system, or it can also be a network that constitutes a gNB or transmission point Nodes, such as baseband unit (BBU), or distributed unit (DU), etc.

In some deployments, gNB may include centralized units (CUs) and DUs. The gNB may also include a radio unit (RU). CU implements some functions of gNB, and DU implements some functions of gNB. For example, CU implements radio resource control (RRC), packet data convergence protocol (PDCP) layer functions, and DU implements wireless chain Radio link control (RLC) layer, media access control (MAC) layer and physical (physical, PHY) layer functions. Since RRC layer information will eventually become PHY layer information, or transformed from PHY layer information, in this architecture, high-level signaling, such as RRC layer signaling, can also be considered to be sent by DU , or sent by DU+CU. It can be understood that the access network device may be a CU node, a DU node, or a device including a CU node and a DU node. In addition, the CU can be divided into access network equipment in the access network (radio access network, RAN), or the CU can be divided into access network equipment in the core network (core network, CN). This application does not do this. limited.

It should also be understood that the terminal equipment in the wireless communication system may also be called user equipment (UE), Access terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communications equipment, user agent or user device. The terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (pad), a computer with a wireless transceiver function, a virtual reality (VR) terminal device, or an augmented reality (AR) terminal. Equipment, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical, wireless terminals in smart grid, transportation safety ( Wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, etc. The embodiments of this application do not limit application scenarios.

In this embodiment of the present application, the terminal device or the access network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. This hardware layer includes hardware such as central processing unit (CPU), memory management unit (MMU) and memory (also called main memory). The operating system can be any one or more computer operating systems that implement business processing through processes, for example, operating system, operating system, operating system, operating system or operating system, etc. This application layer includes applications such as browsers, address books, word processing software, and instant messaging software. Moreover, the embodiments of the present application do not specifically limit the specific structure of the execution subject of the method provided by the embodiment of the present application, as long as the program that records the code of the method provided by the embodiment of the present application can be run to provide according to the embodiment of the present application. For example, the execution subject of the method provided by the embodiment of the present application can be a terminal device or an access network device, or a functional module in the terminal device or access network device that can call a program and execute the program.

Additionally, various aspects or features of the present application may be implemented as methods, apparatus, or articles of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used in this application encompasses a computer program accessible from any computer-readable device, carrier or medium. For example, computer-readable media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks, tapes, etc.), optical disks (e.g., compact discs (CD), digital versatile discs (DVD)) etc.), smart cards and flash memory devices (e.g. erasable programmable read-only memory (EPROM), cards, sticks or key drives, etc.). Additionally, the various storage media described herein may represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing and/or carrying instructions and/or data.

In order to facilitate understanding of the embodiments of the present application, the relevant technical contents involved in the present application are briefly described first.

1. Modulation technology: A technology that controls the changes in the amplitude, phase or frequency of the carrier wave according to the information that needs to be sent, so that the information is transmitted through the carrier wave.

2. FSK modulation technology: a modulation technology that modulates information on the carrier frequency.

3. Modulation order: used to calculate the number of bits that each symbol (code element) of the code pattern can represent. If the modulation order is M, then the number of bits that each symbol (symbol) can represent is log ₂ M, that is, one symbol (symbol) can carry log ₂ M bits of information. At this time, FSK with modulation order M can be called M-FSK.

For example, if the modulation order is 2, one symbol (symbol) can carry 1 bit of information. At this time, it can be considered as a 01-bit sequence of transmitted information, and each symbol can transmit 1 bit. The FSK signal with frequency f ₁ can represent the transmission of "0", and the FSK signal with frequency f ₂ can represent the transmission of "1". The carrier frequency f _c of the FSK signal is the average of f ₁ and f ₂ value. For example, as shown in Figure 2, it is a schematic diagram of the relationship between the amplitude and time of an FSK signal with a modulation order of 2.

For another example, if the modulation order is 4, one symbol (symbol) can carry 2 bits of information. At this time, it can be considered as a 01-bit sequence of transmitted information, and each symbol can transmit 2 bits. Sending an FSK signal with frequency f ₁ can represent What is lost is "00", sending an FSK signal with a frequency of f ₂ can represent that the transmission is "01", sending an FSK signal with a frequency of f ₃ can represent that the transmission is "10", sending an FSK signal with a frequency of f ₄ can represent The one that represents transmission is "11". The carrier frequency f _c of this FSK signal is the average of f ₁ , f ₂ , f ₃ and f ₄ . For example, as shown in Figure 3, it is a schematic diagram of the relationship between the amplitude and time of an FSK signal with a modulation order of 4.

It should be noted that Figure 2 and Figure 3 are only two examples of FSK signals, which should not limit the present application.

4. Demodulation technology: It is the reverse process of modulation technology. Generally, the receiving device obtains the information sent by the sending device from the modulated signal (the signal modulated by the sending device) through some signal processing means.

5. FSK receiving equipment: It can be divided into two basic modes: coherent FSK receiving equipment and non-coherent FSK receiving equipment. Among them, the coherent FSK receiving equipment needs to recover the carrier wave. That is to say, the coherent FSK receiving equipment needs to recover the carrier and use the recovered carrier to demodulate the FSK signal to obtain the demodulated information. Non-coherent FSK receiving equipment does not have such a need. That is to say, non-coherent FSK receiving equipment does not need to recover the carrier. It can directly demodulate based on the received FSK signal and obtain demodulated information.

Generally, coherent FSK receiving equipment has better demodulation performance, but the corresponding power consumption will be higher. There are some gaps in the demodulation performance of non-coherent FSK receiving equipment, but the advantages are simple structure and low power consumption. In many communication systems, the requirements for low power consumption are very high, and non-coherent FSK receiving equipment is often selected at this time.

It should be noted that the receiving device involved in the embodiment of this application is a non-coherent FSK receiving device.

Next, taking the non-coherent FSK receiving device shown in Figure 4 as an example, the circuit of the non-coherent FSK receiving device will be described.

For example, as shown in Figure 4, the non-coherent FSK receiving equipment includes: radio frequency band pass filter (RF BPF), radio frequency signal amplifier (radio frequency low noise amplifier, RF LNA), local crystal oscillator (local oscillator (LO) (also called local oscillator), multiplier, intermediate noise amplifying (IF LNA), BPF, frequency modulation (FM) amplitude modulation (AM) converter, low pass Filter (low-pass filter, LPF), envelope or amplitude detection module (envelop detector).

The process of the non-coherent FSK receiving device receiving the FSK signal (for example, 1GHz) is roughly as follows: after the FSK signal is received by the antenna of the non-coherent FSK receiving device, first, it is filtered by the RF BPF, and the signal is amplified by the RF LNA. After that, it is mixed with the local oscillator signal output by the LO through a multiplier, and the mixed FSK signal is down-converted to an intermediate frequency (for example, 50MHz); then, it is filtered again through the BPF, and the filtered signal is The frequency information is converted into amplitude information through the FM-AM converter, and after the noise is removed by LPF, the envelope or amplitude detection module (envelop detector) can be used to detect the modulation information through the amplitude information.

On the one hand, in the non-coherent FSK receiving device as shown in Figure 4, the FM-AM converter can convert signals of different frequencies into signals of different amplitudes.

Next, the FM-AM converter will be described, taking the internal structure of the FM-AM converter shown in Figure 5 as an example. It should be noted that Figure 5 is only an example of the internal structure of the FM-AM converter, which should not limit the present application.

For example, as shown in Figure 5, the FM-AM converter includes a phase shift module and a multiplier, where the phase shift module can perform different phase rotations on signals of different frequencies. The signal S(t) input to the FM-AM converter is divided into two channels. One channel directly enters the multiplier, and the other channel first enters the phase shift module. After the signal S(t) passes through the phase shift module, the signal Sp(t) is obtained. The signal Sp( t) then enters the multiplier to mix with the signal S(t) to obtain the mixed signal S(t)Sp(t).

Among them, the phase φ _rot (f) rotated by the phase shift module on the signal S(t) satisfies the following formula:

Among them, f _c is the carrier frequency, and f _FSK (t) is the frequency corresponding to the signal S(t).

In this way, the relationship between the amplitude of the signal Sp(t) and time is as follows:
Sp(t)＝cos[2πf _c t+φ(t,α)+φ _rot (f _FSK (t))]

The relationship between the amplitude and time of the signal S(t)Sp(t) after filtering out the high-frequency components is as follows:

When 2πK(f _FSK (t)-f _c ) is small, sin[2πK(f _FSK (t)-f _c )]≈2πK(f _FSK (t)-f _c ), so the FM-AM converter is completed Convert frequency to amplitude.

Regardless of the content structure of the FM-AM converter, there is a linear operating range in the internal structure of the FM-AM converter. Usually, according to the frequency range of the signal received by the receiving device, it is enough to set the frequency-amplitude conversion curve of the FM-AM converter to have a linear relationship within the frequency range of the intermediate frequency signal.

Figures 6 and 7 are respectively schematic diagrams of an example of the frequency-amplitude conversion curve of an FM-AM converter. For example, as shown in Figures 6 and 7, under ideal conditions, the frequency-amplitude conversion curve of an FM-AM converter has a linear relationship, as shown by the solid lines in Figures 6 and 7. In the actual state, the frequency-amplitude conversion curve of the FM-AM converter can only have an approximately linear relationship within a certain frequency range, as shown by the dotted lines in Figures 6 and 7. The frequency of the FM-AM converter -The amplitude conversion curve only has an approximately linear relationship within the [f ₁₁ , f ₁₂ ] interval.

For the convenience of description, the frequency range in which the frequency-amplitude conversion curve of the FM-AM converter has an approximately linear relationship within a certain frequency range is called the linear working range of the FM-AM converter.

If the frequencies of the signals after mixing the local oscillator signal generated by the LO and the received signal are f ₁ , f ₂ , f ₃ , and f ₄ , and f ₁ , f ₂ , f ₃ , and f ₄ are all in [f ₁₁ ,f ₁₂ ] interval, the amplitudes converted by the FM-AM converter are e ₁ , e ₂ , e ₃ , and e ₄ respectively. As shown in Figure 6, if the frequency difference between two adjacent frequencies in f ₁ , f ₂ , f ₃ , and f ₄ is the same, then the two adjacent frequencies in e ₁ , e ₂ , e ₃ , and e ₄ The amplitude difference between the amplitudes is also the same.

However, due to reasons of the LO itself (such as the stability of the LO), its performance may be unstable, or because the performance of the LO is easily affected by its surrounding environment such as temperature, the frequency of the local oscillator signal generated by the LO is often different from the ideal There will be a deviation in frequency, which will cause the frequency of the signal after mixing the local oscillator signal generated by the LO and the received signal to deviate from the ideal frequency by Δf. If the deviation △f is large, the mixing frequency of the local oscillator signal generated by the LO and the received signal will exceed the linear working range of the FM-AM converter, which may cause the converted amplitude to no longer have a linear relationship.

For example, if the frequency of the local oscillator signal generated by the LO and the received signal after mixing are f ₁ , f ₂ , f ₃ , f ₄ , however, due to the deviation _△ f in the local oscillator signal generated by the LO, the frequency of the local oscillator signal generated by the LO is f The frequencies of the signals after mixing the local oscillator signal and the received signal become f ₁ +△f, f ₂ +△f, f ₃ +△f, f ₄ +△f. For example, as shown in Figure 7, f ₁ + △f and f ₂ + △f are within the interval [f ₁₁ , f ₁₂ ], and f ₃ + △f and f ₄ + △f exceed the interval [f ₁₁ , f ₁₂ ]. . In this way, even if the intervals between f ₁ + △f, f ₂ + △f, f ₃ + △f, and f ₄ + △f are the same, e ₁ ', e ₂ ', e ₃ ', e ₄ 'The intervals between the two are not the same.

In this way, the baseband signal obtained after the receiving device demodulates the received signal will have errors, which will seriously affect the demodulation performance of the receiving device.

Therefore, embodiments of the present application provide a communication method, which can be applied in a communication system between a sending device and a receiving device.

In one example, the sending device may be the base station or satellite station described in Figure 1, and the receiving device may be the terminal device described in Figure 1.

In another example, the sending device may be a terminal device described in FIG. 1 , and the receiving device may be another terminal device described in FIG. 1 .

The communication method provided by the embodiment of the present application will be described below with reference to specific drawings.

Figure 8 is a schematic flow chart of an example communication method 800 provided by the embodiment of the present application.

For example, as shown in Figure 8, the communication method 800 includes S810 and S820. The S810 and S820 are described in detail below.

S810: The sending device uses frequency division multiplexing (FDM) to send the first signal and the first data to the receiving device. Correspondingly, the receiving device receives the first signal and the first data sent by the sending device.

The first signal is used to assist the receiving device in correcting the frequency offset of the local oscillator signal generated by the receiving device. That is to say, after receiving the first signal, the receiving device will perform frequency offset correction on the local oscillator signal generated by the receiving device according to the first signal.

It should be noted that this application is not limited to the sending device sending the first signal and the first data to the receiving device in a frequency division multiplexing manner. It may also send the first signal and the first data in a time division manner. .

Optionally, in some embodiments, in S820, the sending device may also only send the first signal to the receiving device. Thereafter, if the sending device has first data to send to the receiving device, the sending device sends the first data to the receiving device. If the sending device does not send the first data to the receiving device, the sending device will not send the first data to the receiving device.

It should be understood that before the sending device sends the first signal, the sending device needs to modulate the first signal.

The embodiment of the present application does not limit the modulation method of the first signal by the sending device.

In one example, the transmitting device may frequency shift key modulate the first signal. For example, if the modulation order of the first signal is 2, one symbol can carry 1 bit of information. At this time, it can be considered that the bits of the transmitted information include a sequence of "0" and "1". The first signal transmitted with the frequency f ₁ can represent that "0" is transmitted, and the second signal transmitted with the frequency f ₂ can represent What represents transmission is "1", and the carrier frequency of the first signal is f _c1 .

In another example, the sending device performs differential frequency modulation modulation on the first signal, that is, the first signal adopts a differential frequency modulation modulation method.

Specifically, the sending device modulates the first signal according to the second frequency difference mapped by each P bits in the sequence of the first signal.

Wherein, P=log ₂ Q, Q is the modulation order of the first signal, that is to say, every P bits in the sequence of the first signal are mapped to a second frequency difference. The second frequency difference is the frequency difference between the first signal in two adjacent time units. The frequency of the first signal in the jth time unit f(j)=mod[f(j-1)+Δf ₁ (j), B2], Δf ₁ (j) is the jth in the sequence of the first signal The second frequency difference between the first signal and the (j-1)th first signal, B2 is the preset second bandwidth value, and j is an integer greater than 1.

It should be noted that when j is 2, f(j-1)=f(1) can take any value, and the embodiment of the present application does not limit the specific value of f(1).

In addition, the time unit described in all embodiments of this application can be understood as the period of one symbol in the bit sequence. The value of the time unit in this application is not limited. For example, the time unit may be a symbol.

Because the time interval between the two time units before and after is very short, even if there is a residual frequency offset in the local oscillator signal generated by the receiving device, the residual frequency offset of the local oscillator signal generated in the two time units before and after can be considered to be the same. In this way, the sending device Right A signal uses differential FM modulation. The receiving device can offset the residual frequency offset of the local oscillator signal generated by the receiving device by subtracting the frequencies of the first signal in the two time units before and after (i.e., differential FM modulation). , thus not affecting the demodulation performance of the receiving device.

It should be noted that the mapping relationship between the bit sequence of the first signal and/or the mapping relationship between each P bits in the bit sequence of the first signal and the second frequency difference may be configured.

The embodiment of the present application does not limit the configuration of the mapping relationship between the bit sequence of the first signal and/or the mapping relationship between each P bits in the bit sequence of the first signal and the second frequency difference.

In one example, the mapping relationship between the bit sequence of the first signal and/or the mapping relationship between each P bits in the bit sequence of the first signal and the second frequency difference may be configured by the base station or the satellite station.

In this example, if the sending device is not a base station or a satellite station, the base station or satellite station needs to send the bit sequence of the first signal to the sending device and/or the receiving device, and/or, each P bit sequence of the first signal The mapping relationship between bits and the second frequency difference.

In this example, if the sending device is a base station or a satellite station, the sending device may also map the bit sequence of the first signal and/or the mapping relationship between each P bits in the bit sequence of the first signal and the second frequency difference. sent to the receiving device.

In another example, the mapping relationship between the bit sequence of the first signal and/or the mapping relationship between each P bits in the bit sequence of the first signal and the second frequency difference may be pre-specified or configured by (protocol).

For example, if the sending device uses modulation order 2 to perform differential FM modulation on the first signal, then each bit of the 0/1 bit sequence of the transmitted first signal can be mapped to a symbol, and each bit includes " There are two possibilities: 0" and "1". The sending device may map each bit in the bit sequence of the first signal to a second frequency difference, and modulate the first signal according to the second frequency difference mapped to each bit in the bit sequence.

Table 1 is an example of the mapping relationship between each bit in the bit sequence and the second frequency difference provided by the embodiment of the present application.

It should be noted that Table 1 is only an example, and it should not limit this application. The embodiment of the present application does not limit the value of the second frequency difference mapped to each bit in the bit sequence.

Table 1

For example, the following assumptions are made: (1) The bit sequence of the first signal transmitted by the sending device is: "0110"; (2) When j is 2, f(j-1)=f(1)=50kHz, at this time , f(1) can be called the initial frequency of the first signal; (3) B2 = 180 kHz; (4) The mapping relationship between each bit in the bit sequence and the second frequency difference is the mapping relationship shown in Table 1. Then, the sending device needs to modulate the first signal according to the bit sequence of the first signal. The specific process is as follows:

S1: After the sending device modulates the first signal transmitted by the symbol corresponding to the first bit ("0") in the bit sequence of the first signal, the obtained frequency is 50kHz (initial frequency) + 0kHz (first bit ("0") mapped second frequency difference) = 50 kHz.

S2: After the sending device modulates the first signal transmitted by the symbol corresponding to the second bit ("1") in the bit sequence of the first signal, the obtained frequency is 50kHz (corresponding to the first bit ("0") The modulated frequency of the first signal transmitted by the symbol) + 100 kHz (the second frequency difference mapped by the second bit (“1”)) = 150 kHz.

S3: After the sending device modulates the first signal transmitted by the symbol corresponding to the third bit ("1") in the bit sequence of the first signal, the obtained frequency is 150kHz (corresponding to the second bit ("1") The symbol is transmitted first The frequency after modulation of the signal) + 100kHz (the second frequency difference mapped by the third bit (“1”)) = 250kHz. However, since 250kHz exceeds the preset second bandwidth value B2, it is necessary to modify the bit sequence of the first signal according to f(j)=mod[f(j-1)+Δf ₁ (j), B2] The frequency after modulation of the first signal transmitted by the symbol corresponding to the third bit ("1") in the bit sequence of the first signal is adjusted, and finally the third bit ("1") corresponding to the symbol transmitted by the bit sequence of the first signal The modulated frequency of a signal is mod[250,180]=70kHz.

S4: After the sending device modulates the first signal transmitted by the symbol corresponding to the fourth bit ("0") in the bit sequence of the first signal, the obtained frequency is 70kHz (corresponding to the third bit ("1") The modulated frequency of the first signal transmitted by the symbol) + 0 kHz (the second frequency difference mapped by the fourth bit (“0”)) = 70 kHz. In this way, the frequency after the transmitting device modulates the bit sequence of the transmitted first signal is as shown in Table 2.

Table 2

It should be noted that the bit sequence of the first signal sent by the sending device may be the information bits sent by the sending device to the receiving device, or the bit sequence of the first signal sent by the sending device may be predetermined or configured. This application provides This is not a limitation.

In one example, the first signal may carry no content.

In another example, the first signal may also carry content.

For example, the first signal may carry the identity of the cell. The cell is the area served by the sending device, and the identity of the cell is used to assist the receiving device in determining whether it is receiving information from the correct sending device.

It should be noted that if the receiving device is within the coverage of the sending device, then the sending device can be understood as the correct sending device as mentioned above. Alternatively, if the receiving device and the sending device have established a connection, then the sending device can also be understood as the correct sending device as mentioned above.

It should be noted that the embodiment of the present application does not limit whether the first signal carries content. Moreover, the embodiment of the present application does not limit the name of the first signal. For example, the first signal can also be called other signals such as a reference signal. Any signal with the same function as the first signal can be considered as the first signal.

In one example, the sending device may send the first signal and the first data periodically. Correspondingly, the receiving device may periodically receive the first signal and the first data sent by the sending device.

For example, the period in which the sending device sends the first signal and the first data may be notified by the sending device to the receiving device, or the period in which the sending device sends the first signal and the first data may be predetermined or configured. This application implements This example does not limit this.

The embodiment of the present application does not limit the value of the period for sending the first signal and the first data, and it can be determined according to the actual situation.

S820: The sending device uses frequency division multiplexing to send the second signal and the second data to the receiving device. Correspondingly, the receiving device receives the second signal and the second data sent by the sending device.

The second signal is used to instruct the receiving device to enter the connected state. That is, the second signal is used to indicate receiving The device enters the connected state and receives the data (first data and second data) sent by the sending device.

It should be noted that this application is not limited to the sending device sending the second signal and the second data to the receiving device in a frequency division multiplexing manner. It may also send the second signal and the second data in a time division manner. .

Optionally, in some embodiments, in S820, the sending device may also only send the second signal to the receiving device. Afterwards, if the sending device has second data to send to the receiving device, the sending device sends the second data to the receiving device. If the sending device does not have second data to send to the receiving device, the sending device will not send the second data to the receiving device.

Optionally, in one example, the sending device sends corresponding signals and data to the receiving device according to the configured sending parameters of the first signal and the second signal. In this way, starting from the sending device side, the impact on the demodulation performance of the signal sent by the sending device on the receiving device side can be avoided.

In this example, the first transmission parameter of the first signal in S810 and the second transmission parameter of the second signal in S820 are configured separately, and the first transmission parameter and the second transmission parameter are of the same type. . The first transmission parameter includes at least one of the following: a first frequency guard interval between the first signal and the first data, a modulation order of the first signal, and a transmission power of the first signal. The second transmission parameter includes at least one of the following: a second frequency guard interval between the second signal and the second data, a modulation order of the second signal, and a transmission power of the second signal.

A frequency protection bandwidth is set between the first signal and the first data, and between the second signal and the second data. Furthermore, when the local oscillator signal generated by the receiving device has a frequency offset, the receiving device can be prevented from converting the adjacent band The signal is received to affect the demodulation performance.

The embodiment of the present application does not limit the configuration side of the first transmission parameter and the second transmission parameter. For example, the first transmission parameter and the second transmission parameter may be configured by the base station or satellite station. Alternatively, the first transmission parameter and the second transmission parameter may be pre-specified or configured (protocol).

It should be noted that if the sending device is a base station or a satellite station, and the first sending parameter and the second sending parameter are configured by the base station or the satellite station, the sending device can also send the first sending parameter and the second sending parameter to the receiving device. .

If the sending device is not a base station or a satellite station, and the first sending parameter and the second sending parameter are configured by the base station or satellite station, the base station or satellite station needs to send the first sending parameter and the second sending parameter to the sending device and/or the receiving device. .

This application does not limit how to configure the first sending parameter and the second sending parameter.

In an implementable manner, the first sending parameter and the second sending parameter may be configured by configuring a relationship between the first sending parameter and the second sending parameter.

In one example, the first sending parameter and the second sending parameter may be configured by configuring a size relationship between the first sending parameter and the second sending parameter.

For example, it can be configured that: the first frequency guard interval is greater than the second frequency guard interval; and/or the modulation order of the first signal is lower than the modulation order of the second signal; and/or the transmit power of the first signal is high. to the transmit power of the second signal.

It should be noted that the above description takes the first sending parameter and the second sending parameter as being different (the specific values corresponding to the parameters are different) as an example. In another example, the first sending parameter and the second sending parameter are different. It can also be the same, and this application does not limit this.

Since the first signal is used to assist the receiving device in correcting the frequency offset of the local oscillator signal generated by the receiving device, and the local oscillator signal generated by the receiving device has a frequency offset, the frequency between the first signal and the first data is The guard interval (relative to the frequency guard interval between the second signal and the second data) is set larger to prevent the normally transmitted first data on the adjacent frequency band from entering the receiving device to correct the frequency offset of the local oscillator signal it generates. circuit to avoid affecting the frequency offset correction process of the local oscillator signal generated by the receiving device.

For example, in an example in which the communication method 800 also includes S830-B and S840-B described below, the receiving device uses a first filter to mix the first signal and the first local oscillator signal to obtain a third signal. filtered, then setting the frequency guard interval between the first signal and the first data (relative to the frequency guard interval between the second signal and the second data) larger can ensure normal transmission on the adjacent frequency band. The first data does not enter the passband of the first filter, which has a larger bandwidth (relative to the second filter).

Further, since the second signal is used to instruct the receiving device to enter the connected state, and after the receiving device performs frequency offset correction on the local oscillator signal generated by it, the frequency offset of the obtained local oscillator signal is reduced, therefore, the third signal is The frequency guard interval between the second signal and the second data (relative to the frequency guard interval between the first signal and the first data) is set smaller to prevent the normal transmission of the second data on the adjacent frequency band from affecting the receiving device. The interference to demodulation of the second signal is eliminated. At the same time, the smaller guard interval improves the utilization of system resources and saves the cost of frequency band resources.

For example, in the example where the communication method 800 also includes S830-B and S840-B described below, the receiving device is a fourth signal obtained by mixing the second signal and the second local oscillator signal through the second filter. filtering is performed, and the second local oscillator signal is a signal obtained by frequency offset correction of the first local oscillator signal, then even if there is a residual frequency offset in the fourth signal, the residual frequency offset is small. In this way, the bandwidth of the second filter on the receiving device side (relative to the bandwidth of the first filter) can be used to complete the demodulation process of the fourth signal using a smaller bandwidth. At this time, since the receiving device uses a second filter with a smaller bandwidth (relative to the bandwidth of the first filter) to complete the demodulation of the second signal, starting from the transmitting end, the second signal and the third signal can also be reduced. The frequency guard interval between the two data (relative to the frequency guard interval between the first signal and the first data) improves the utilization of system resources and saves the cost of frequency band resources.

Further, since the second signal is used to instruct the receiving device to enter the connected state, and after the receiving device performs frequency offset correction on the local oscillator signal generated by it, the frequency offset of the obtained local oscillator signal is reduced, therefore, the third signal is The modulation order of the second signal (relative to the modulation order of the first signal) is set larger and does not need to be set too low. In this way, in the same interval, even if the number of bit sequences of the second signal collected by the receiving device is larger More, it will not affect the demodulation performance of the second signal by the receiving device.

Since the second signal is used to instruct the receiving device to enter the connected state, and after the receiving device corrects the frequency offset of the local oscillator signal generated by it, the frequency offset of the obtained local oscillator signal is reduced. Therefore, the sending device does not need to use High transmit power, using lower transmit power (relative to the transmit power of the first signal) to transmit the second signal, the receiving device can obtain higher demodulation performance for the second signal, thus reducing the cost of the sending device Power overhead.

In another example, the first sending parameter and the second sending parameter may be configured by configuring whether the first sending parameter and the second sending parameter are the same.

For example, it can be configured that: the first frequency guard interval and the second frequency guard interval are different; and/or, the modulation order of the first signal and the modulation order of the second signal are different; and/or, the modulation order of the first signal is different. The transmission power is different from the transmission power of the second signal.

In another implementable manner, the first sending parameter and the second sending parameter may be configured by configuring specific values of the first sending parameter and the second sending parameter.

For example, the configuration can be: the first frequency guard interval is W1, the second frequency guard interval is W2; and/or the modulation order of the first signal is A1 or the first signal is a single frequency signal, and the second signal The modulation order is A2; and/or, the transmission power of the first signal is P1, and the transmission power of the second signal is P2.

It should be noted that the same type of the first sending parameter and the second sending parameter can be understood as: the parameter type included in the first sending parameter and the parameter type included in the second sending parameter are the same. For example, if the first transmission parameter includes a first frequency guard interval between the first signal and the first data, then the second transmission parameter includes a second frequency guard interval between the second signal and the second data. If the first transmission parameter includes the modulation order of the first signal, then the second transmission parameter includes the modulation order of the second signal. If the first transmission parameter includes the transmission power of the first signal, then the second transmission parameter includes the transmission power of the second signal.

In one example, in order to reduce the power consumption of the receiving device, two links are usually provided in the receiving device. Among them, one link is used to receive normal sending and receiving data. When the link is activated, the power consumption of the communication device is relatively large; the other link is used when the receiving device is in a non-connected state. When the link is up, the receiving device consumes very little power. That is, in order to reduce the power consumption of the receiving device, the receiving device may receive signals (such as the first signal and the second signal) and data (such as the first data and the second data) through two links respectively.

Specifically, when the receiving device is in the non-connected state, the first link of the receiving device is in the working state, and at this time, the second link of the receiving device is in the closed state. When the receiving device needs to enter the connected state, the receiving device needs to start the second link first. For example, when the receiving device is in a non-connected state, the receiving device receives a first signal and a second signal through the first link, and the receiving device receives in the second signal a signal indicating receiving data or entering the connected state. After receiving the instruction information, the receiving device triggers the receiving device to start the second link, and then after exchanging information with the sending device, the receiving device enters the connected state, and then receives the first data and the second data through the second link.

For example, the first link mentioned above can also be called a wake up link (wake up radio, WUR), and the second link can also be called a main link (main radio), which is not limited in this application. .

It should be noted that the receiving device can also be provided with only one link, and the receiving device can also receive signals (such as the first signal and the second signal) and data (such as the first data and the second data) respectively through this one link. , this application does not limit this.

In addition, in the example where the receiving device sets two links (the first link and the second link), the receiving device can receive the configuration parameters sent by the sending device through any one of the two links. This application The embodiment does not limit which link of the two links the receiving device uses to receive the configuration parameters sent by the sending device. Exemplarily, the configuration parameter may include at least one of the following: a bit sequence of the first signal, a mapping relationship between each P bits in the bit sequence of the first signal and the second frequency difference, a mapping relationship between the first signal and the first data. The transmission cycle, the bit sequence of the second signal, the mapping relationship between every N bits in the bit sequence of the second signal and the first frequency difference, the first transmission parameter and the second transmission parameter, the transmission of the second signal and the second data cycle.

It should be understood that before the sending device sends the second signal, the sending device needs to modulate the second signal.

The embodiment of the present application does not limit the modulation method of the second signal by the sending device.

Optionally, in one example, the sending device may perform frequency shift keying modulation on the second signal. For example, if the second The modulation order of the signal is 2, so one symbol can carry 1 bit of information. At this time, it can be considered that the bits of the transmitted information include a sequence of "0" and "1". The second signal transmitted with the frequency f ₃ can represent that "0" is transmitted, and the second signal transmitted with the frequency f ₄ can represent It means "1" is transmitted, and the carrier frequency of the second signal is f _c2 .

In another example, the sending device performs differential FM modulation on the second signal, that is, the second signal adopts a differential FM modulation method.

Specifically, the sending device modulates the second signal according to the first frequency difference mapped by every N bits in the sequence of the second signal.

Among them, N=log ₂ M, and M is the modulation order of the second signal. That is to say, every N bits in the sequence of the second signal are mapped to a first frequency difference. The first frequency difference is the frequency difference between the second signal in two adjacent time units. The frequency f(i) of the second signal in the i-th time unit=mod[f(i-1)+Δf(i),B1], where Δf(i) is the i-th second signal in the sequence of the second signal The first frequency difference between the second signal and the (i-1)th second signal, B1 is the preset first bandwidth value, and i is an integer greater than 1.

It should be noted that when i is 2, f(i-1)=f(1) can take any value, and the embodiment of the present application does not limit the specific value of f(1).

Because the time interval between the two time units before and after is very short, even if there is a residual frequency offset in the local oscillator signal generated by the receiving device, the residual frequency offset of the local oscillator signal generated in the two time units before and after can be considered to be the same. In this way, the sending device Using a differential FM modulation method for the second signal, the receiving device can subtract the frequencies of the second signal in the two time units before and after (i.e., the differential FM modulation method), and the residual frequency of the local oscillator signal generated by the receiving device can be partial cancellation, thus not affecting the demodulation performance of the receiving device.

It should be noted that the mapping relationship between the bit sequence of the second signal and/or the mapping relationship between every N bits in the bit sequence of the second signal and the first frequency difference may be configured.

The embodiment of the present application does not limit the configuration of the mapping relationship between the bit sequence of the second signal and/or the mapping relationship between every N bits in the bit sequence of the second signal and the first frequency difference.

In one example, the mapping relationship between the bit sequence of the second signal and/or the mapping relationship between every N bits in the bit sequence of the second signal and the first frequency difference may be configured by the base station or the satellite station.

In this example, if the sending device is not a base station or a satellite station, the base station or satellite station needs to send the bit sequence of the second signal to the sending device and/or the receiving device, and/or, every N bit sequence of the second signal The mapping relationship between bits and the first frequency difference.

In this example, if the sending device is a base station or a satellite station, the sending device may also map the bit sequence of the second signal and/or the mapping relationship between each P bits in the bit sequence of the second signal and the second frequency difference. sent to the receiving device.

In another example, the bit sequence of the second signal, and/or the mapping relationship between every N bits in the bit sequence of the second signal and the first frequency difference may be pre-specified or configured (protocol).

For example, if the sending device uses modulation order 4 to perform differential FM modulation on the second signal, then the 0/1 bit sequence of the transmitted second signal can be mapped to a symbol (symbol) every two bits, and every two bits Including four possibilities: "00", "01", "10" and "11". The sending device may map every two bits in the bit sequence of the second signal to a first frequency difference, and modulate the second signal according to the first frequency difference mapped to every two bits in the bit sequence.

Table 3 is an example of the mapping relationship between each two bits in the bit sequence and the first frequency difference provided by the embodiment of the present application.

It should be noted that Table 3 is only an example, and it should not limit this application. The embodiment of the present application does not limit the value of the first frequency difference mapped to every two bits in the bit sequence.

table 3

For example, the following assumptions are made: (1) The bit sequence of the second signal transmitted by the sending device is: "01100011"; (2) When i is 2, f(i-1)=f(1)=20kHz, at this time , f(1) can be called the initial frequency of the second signal; (3) B1 = 200 kHz; (4) The mapping relationship between every two bits in the bit sequence and the first frequency difference is the mapping relationship shown in Table 1. Then, the sending device needs to modulate the second signal according to the bit sequence of the second signal. The specific process is as follows:

S1: After the sending device modulates the second signal transmitted by the symbols corresponding to the first bit ("0") and the second bit ("1") in the bit sequence of the second signal, the obtained frequency is 20kHz ( Initial frequency) + 50kHz (the first frequency difference mapped by the first bit (“0”) and the second bit (“1”)) = 70kHz.

S2: After the sending device modulates the second signal transmitted by the symbols corresponding to the third bit ("1") and the fourth bit ("0") in the bit sequence of the second signal, the obtained frequency is 70kHz ( The modulated frequency of the second signal transmitted by the symbols corresponding to the first bit ("0") and the second bit ("1")) + 100kHz (the third bit ("1") and the fourth bit (First frequency difference mapped by "0") = 170 kHz.

S3: After the sending device modulates the second signal transmitted by the symbols corresponding to the fifth bit ("0") and the sixth bit ("0") in the bit sequence of the second signal, the obtained frequency is 170kHz ( The modulated frequency of the second signal transmitted by the symbol corresponding to the third bit ("1") and the fourth bit ("0")) + 0kHz (the fifth bit ("0") and the sixth bit (First frequency difference mapped by "0") = 170 kHz.

S4: After the sending device modulates the second signal transmitted by the symbols corresponding to the seventh bit ("1") and the eighth bit ("1") in the bit sequence of the second signal, the obtained frequency is 170kHz ( The fifth bit ("0") and the sixth bit ("0") modulated frequency) + 150kHz (the seventh bit ("1") and the eighth bit ("1") mapped One frequency difference)=320kHz. However, since 320kHz exceeds the preset first bandwidth value B1, it is necessary to modify the bit sequence of the second signal according to f(i)=mod[f(i-1)+Δf ₁ (i), B1] The modulated frequency of the second signal transmitted by the symbols corresponding to the seventh bit ("1") and the eighth bit ("1") is adjusted, and finally the seventh bit ("1") and the eighth bit ("1"), the modulated frequency of the second signal transmitted is mod[320,200]=120kHz.

In this way, the frequency after the transmitting device modulates the bit sequence of the transmitted second signal is as shown in Table 4.

Table 4

It should be noted that the bit sequence for sending the second signal by the sending device may be the information bits sent by the sending device to the receiving device, or the bit sequence for sending the second signal by the sending device may be predetermined or configured, and this application does not make any reference to this. limited.

The embodiment of the present application does not limit the sending method of the second signal and the second data.

In one example, the sending device may periodically send the second signal and the second data. Correspondingly, the receiving device may periodically receive the second signal and the second data sent by the sending device.

For example, the period in which the sending device sends the second signal and the second data may be notified by the sending device to the receiving device, or the period in which the sending device sends the second signal and the second data may be predetermined or configured. This application implements This example does not limit this.

The embodiment of the present application does not limit the value of the period for sending the second signal and the second data, and it can be determined according to the actual situation.

FIG. 9 is a schematic diagram of an example of a sending device sending a first signal, first data, a second signal and a second data according to an embodiment of the present application.

As shown in Figure 9, within a period T, the sending device can send the first signal first and then the second signal. The frequency guard interval between the first signal and the first data is Δf ₁ , the frequency guard interval between the second signal and the second data is Δf ₂ , and Δf ₁ > Δf ₂ .

It should be noted that the embodiment of the present application does not limit the time interval between S810 and S820. For example, the sending device sends the second signal immediately after sending the first signal and the first data. This should not limit the present application. For example, the sending device may send the second signal after sending the first signal; or the sending device may stop for a period of time after sending the first signal and then send the second signal.

Optionally, after the receiving device receives the first signal and the second signal, the receiving device may further process the first signal and the second signal.

In one example, the receiving device includes a first branch and a second branch, the first branch includes a first frequency amplitude converter, the second branch includes a second frequency amplitude converter, and the second frequency amplitude converter The linear working range corresponding to the converter is smaller than the linear working range corresponding to the first frequency amplitude converter.

Optionally, if the internal structure of the first frequency amplitude converter and the internal structure of the second frequency amplitude converter are the same as the internal structure of the FM-AM converter shown in Figure 5 above, at this time, the FM can be used - The slope of the frequency-amplitude conversion curve of the phase shift module of the AM converter is used to set the linear working interval corresponding to the first frequency-amplitude converter and the linear working interval corresponding to the second frequency-amplitude converter.

For example, as shown in Figure 10, the ideal conversion curve 1 is the ideal conversion curve corresponding to the first frequency phase curve, the actual conversion curve 1 is the actual conversion curve corresponding to the first frequency phase curve; the ideal conversion curve 2 is the second frequency phase curve The corresponding ideal conversion curve, actual conversion curve 2 is the actual conversion curve corresponding to the second frequency phase curve. It can be seen that the slope of the actual conversion curve 2 is greater than the actual conversion curve 1, but the linear working interval corresponding to the actual conversion curve 2 is smaller than the actual conversion curve 1. Therefore, the corresponding linear working range of the frequency-amplitude converter can be set according to the slope of the frequency-amplitude conversion curve.

Specifically, the first frequency-amplitude converter includes a first phase moving unit, which moves signals of different frequencies into different phases based on the first frequency phase curve; the second frequency-amplitude converter includes a second phase The moving unit, the second phase moving unit moves signals of different frequencies into different phases based on the second frequency phase curve, The slope of the second frequency phase curve is greater than the slope of the first frequency phase curve.

For example, under ideal circumstances, the frequencies of the signals after mixing the first local oscillator signal and the first signal are f ₁ , f ₂ , f ₃ , and f ₄ . However, in actual situations, the first local oscillator signal has frequencies offset and the frequency offset is △f, then the frequency of the signal after mixing the first local oscillator signal and the first signal becomes f ₁ + △f, f ₂ + △f, f ₃ + △f, f ₄ + △f . As shown in Figure 10, f ₁ + △f, f ₂ + △f, f ₃ + △f, f ₄ + △f are all within the linear interval [f ₂₁ , f ₂₂ ] of the actual conversion curve 1. In this way, f The frequency intervals between two adjacent frequencies in ₁ +△f, f ₂ +△f, f ₃ +△f, f ₄ +△f are the same, and the amplitude e ₁ obtained by using the actual conversion curve 2 is , e ₂ ”, e ₃ ”, e ₄ ”, the intervals between two adjacent amplitudes are also the same. Although compared with the ideal amplitude shown in Figure 6, due to the existence of frequency offset, the actually obtained amplitude shown in Figure 10 has an overall offset, but because it is still corresponding to the first frequency amplitude converter 811 _is _within the linear _working range _of Partially corrected.

In addition, since the slope of the actual conversion curve 2 is greater than the slope of the actual conversion curve 1, the Euclidean distance between the amplitudes converted based on the actual conversion curve 2 is greater than the Euclidean distance between the amplitudes converted based on the actual conversion curve 1 . In addition, within the same interval, the closer the Euclidean distance is, the worse the anti-noise capability of demodulation is. Therefore, in the process of demodulating the fourth signal using the actual conversion curve 2, since the Euclidean distance between the amplitudes is relatively far, higher demodulation performance can be obtained.

In this example, the communication method 800 also includes S830-A and S840-A. The following introduces S830-A and S840-A in detail.

S830-A, the receiving device obtains the first amplitude information of the third signal through the first frequency amplitude converter. The third signal is a signal obtained by mixing the first signal and the first local oscillator signal.

Optionally, in an example, if the first signal carries content, the receiving device can also demodulate the third signal through the first branch. Specifically, obtain the third signal through the first amplitude information of the third signal. Modulation information of three signals.

The embodiments of the present application do not limit how to obtain the modulation information of the third signal based on the first amplitude information.

In one example, if the sending device performs frequency shift keying modulation on the first signal, that is, the first signal adopts a frequency modulation modulation method, then based on the first amplitude information of the third signal, the third signal can be obtained. carried modulation information.

In another example, if the sending device performs differential FM modulation on the first signal, that is, the first signal adopts the differential FM modulation method, then the first branch first obtains based on the first amplitude information of the third signal. The frequency difference of the third signal transmitted in adjacent time units, where the frequency of the third signal transmitted in the jth time unit f(j)=mod[f(j-1)+Δf ₁ (j), B3], the △f ₁ (j) is the frequency difference between the jth third signal and the (j-1)th third signal in the sequence of the third signal, and the B3 is the preset Assume a third bandwidth value, and j is an integer greater than 1; then, according to the frequency difference of the third signal, the modulation information carried by the third signal is obtained.

Because the time interval between the two time units before and after is very short, even if the local oscillator signal generated by the receiving equipment has residual frequency offset, the residual frequency offset of the local oscillator signal generated in the two time units before and after can be considered to be the same. In this way, the receiving equipment By subtracting the frequencies of the third signal in the two time units before and after (that is, the differential FM modulation method), the residual frequency offset of the local oscillator signal generated by the receiving device can be offset, thereby not affecting the demodulation performance of the receiving device.

Optionally, in one example, the first branch further includes an envelope or amplitude detection module, and the modulation information of the third signal can be obtained by inputting the first amplitude information into the envelope or amplitude detection module.

For example, if the sending device performs differential FM modulation on the bit sequence of the first signal according to Table 1, the frequency of each bit in the bit sequence of the first signal shown in Table 2 is obtained. Then, the receiving device responds to the third signal (the second signal and The process of demodulating the mixed signal of the second local oscillator signal) includes:

S1, according to the third amplitude information of the third signal, it can be obtained that the frequencies corresponding to the four symbols of the third signal are: 50kHz, 150kHz, 70kHz, and 70kHz. Among them, the four symbols include: the symbol corresponding to the first bit ("0"), the symbol corresponding to the second bit ("1"), the symbol corresponding to the third bit ("1") and the fourth bit ("0") corresponding symbol.

S2, obtain the frequency difference of the third signal transmitted in adjacent time units, that is, obtain the frequency difference of the second signal transmitted by two adjacent symbols in the bit sequence of the third signal, and calculate the frequency difference according to the bit sequence of the first signal. The mapping relationship between each bit and the second frequency difference obtains the modulation information. Among them, since the sending device modulates the first signal according to Table 2, the mapping relationship between each bit in the bit sequence of the first signal and the second frequency difference is found according to Table 2.

Specifically, the frequency difference between the third signal transmitted by the first symbol of the third signal and the initial frequency of the first signal is: 50kHz-50kHz=0kHz. According to Table 1, it can be seen that a frequency difference of 50kHz corresponds to the "0" bit.

The frequency difference between the third signal transmitted by the second symbol of the third signal and the third signal transmitted by the first symbol of the third signal is: 150kHz-50kHz=100kHz. According to Table 1, it can be seen that a frequency difference of 100kHz corresponds to "1" bit.

Since the frequency of the third signal transmitted by the third symbol in the bit sequence of the third signal is smaller than the frequency of the third signal transmitted by the second symbol in the bit sequence of the third signal, the transmitting device responds to the third signal During the modulation process of the third signal transmitted by the third symbol in the bit sequence, its frequency is adjusted. Therefore, the receiving device needs to adjust the frequency according to f(j)=mod[f(j-1)+Δf ₁ (j),B2], restore it. Specifically, the frequency difference between the frequency of the third signal transmitted by the third symbol in the bit sequence of the third signal and the frequency of the third signal transmitted by the second symbol in the bit sequence of the third signal is: 70kHz+180kHz-150kHz= 100kHz. According to Table 3, it can be seen that a frequency difference of 150kHz corresponds to "1" bit.

The frequency difference between the third signal transmitted by the fourth symbol in the bit sequence of the third signal and the third signal transmitted by the third symbol in the bit sequence of the third signal is: 70kHz-70kHz=0kHz. According to Table 3, it can be seen that the frequency difference of 0kHz corresponds to the "0" bit.

In this way, the bit sequence of the third signal obtained by the receiving device is: "0", "1", "1", "0", thereby completing the demodulation of the third signal.

S840-A, the receiving device demodulates the fourth signal through the second branch. The fourth signal is the signal obtained by mixing the second signal and the second local oscillator signal. The second local oscillator signal is based on the first amplitude The signal obtained by correcting the frequency offset of the first local oscillator signal.

For example, the process for the receiving device to obtain the second local oscillator signal may include: the receiving device first obtains the first frequency offset value based on the first amplitude information and the first ideal amplitude information. Then, the receiving device performs frequency offset correction on the first local oscillator signal according to the first frequency offset value to obtain the second local oscillator signal.

Optionally, in an example, the receiving device may also include a frequency offset estimation module and a local crystal oscillator. The process of the receiving device obtaining the second local oscillator signal may specifically include: the first frequency amplitude converter sends the first amplitude information to the frequency offset estimation module, and the frequency offset estimation module determines the first amplitude information based on the first amplitude information and the first ideal amplitude information. The first frequency offset value is obtained and sent to the local crystal oscillator; the local crystal oscillator performs frequency offset correction on the first local oscillator signal according to the first frequency offset value to obtain the second local oscillator signal.

The first ideal amplitude information can be understood as the amplitude information corresponding to the third signal after mixing the first signal and the first local oscillator signal when there is no frequency offset in the first local oscillator signal.

It should be noted that the first ideal amplitude information can be sent by the transmitting device to the receiving device, or the first ideal amplitude information can also be the conversion curve of the receiving device according to the sending frequency and the first frequency amplitude of the first signal. the slope rate calculated.

Optionally, the receiving device demodulating the fourth signal through the second branch includes: the receiving device obtains the third amplitude information of the fourth signal through the second frequency amplitude converter of the second branch, and obtains the third amplitude information of the fourth signal according to the third The amplitude information obtains the modulation information of the fourth signal.

The embodiments of the present application do not limit how to obtain the modulation information of the fourth signal based on the third amplitude information.

In one example, if the sending device performs frequency shift keying modulation on the second signal, that is, the second signal adopts frequency modulation modulation method, then the second branch can obtain based on the third amplitude information of the fourth signal. Modulation information carried by the fourth signal.

In another example, if the sending device performs differential FM modulation on the second signal, that is, the second signal adopts the differential FM modulation method, then the second branch first obtains the phase information based on the third amplitude information of the fourth signal. The frequency difference of the fourth signal transmitted in adjacent time units, where the frequency of the fourth signal transmitted in the i-th time unit f(i)=mod[f(i-1)+Δf ₁ (i,B1] , the Δf ₁ (i) is the frequency difference between the i-th fourth signal and the (i-1)-th fourth signal in the sequence of the fourth signals, and the B1 is a preset The first bandwidth value, i is an integer greater than 1; then the modulation information carried by the fourth signal is obtained according to the frequency difference of the fourth signal.

For example, if the sending device performs differential FM modulation on the bit sequence of the second signal according to Table 3, the frequency of each two bits in the bit sequence of the second signal shown in Table 4 is obtained. Then, the process of demodulating the fourth signal (the signal after mixing the second signal and the second local oscillator signal) by the receiving device includes:

S1', according to the third amplitude information of the fourth signal, it can be obtained that the frequencies corresponding to the four symbols of the fourth signal are: 70kHz, 170kHz, 170kHz, and 120kHz. Among them, the four symbols include: the symbol corresponding to the first bit ("0") and the second bit ("1"), the symbol corresponding to the third bit ("1") and the fourth bit ("0") The symbol of , the symbol corresponding to the fifth bit ("0") and the sixth bit ("0"), and the symbol corresponding to the seventh bit ("1") and the eighth bit ("1").

S2', obtain the frequency difference of the fourth signal transmitted in adjacent time units, that is, obtain the frequency difference of the second signal transmitted by two adjacent symbols in the bit sequence of the fourth signal, and obtain the frequency difference according to the bit sequence of the second signal. The modulation information is obtained from the mapping relationship between each two bits and the first frequency difference. Since the sending device modulates the second signal according to Table 1, the mapping relationship between each two bits in the bit sequence of the second signal and the first frequency difference is found according to Table 1.

Specifically, the frequency difference between the fourth signal transmitted by the first symbol of the fourth signal and the initial frequency of the second signal is: 70kHz-20kHz=50kHz. According to Table 1, it can be seen that the frequency difference of 50kHz corresponds to the "01" bit.

The frequency difference between the fourth signal transmitted by the second symbol of the fourth signal and the fourth signal transmitted by the first symbol of the fourth signal is: 170kHz-70kHz=150kHz. According to Table 1, it can be seen that the frequency difference of 150kHz corresponds to "11" bit.

The frequency difference between the fourth signal transmitted by the third symbol in the bit sequence of the fourth signal and the fourth signal transmitted by the second symbol of the fourth signal is: 170kHz-170kHz=0kHz. According to Table 1, it can be seen that the frequency difference of 0kHz corresponds to the "00" bit.

Since the frequency of the fourth signal transmitted by the fourth symbol in the bit sequence of the fourth signal is smaller than the frequency of the fourth signal transmitted by the third symbol in the bit sequence of the fourth signal, the transmitting device responds to the fourth signal During the modulation process of the fourth signal transmitted by the fourth symbol, its frequency is adjusted. Therefore, the communication device 800 needs to adjust the frequency according to f(i)=mod[f(i-1)+Δf ₁ ( i),B1], restore it. Specifically, the frequency of the fourth signal transmitted by the fourth symbol in the bit sequence of the fourth signal is the same as the frequency of the fourth signal transmitted by the third symbol in the bit sequence of the fourth signal. The frequency difference of the signal is: 120kHz+200kHz-170kHz=150kHz. According to Table 1, it can be seen that the frequency difference of 150kHz corresponds to "11" bit.

In this way, the bit sequence of the fourth signal obtained by the communication device 800 is: "01", "10", "00", and "11", thereby completing the demodulation of the fourth signal.

According to the relevant descriptions of S830-A and S840-A above, it can be seen that the receiving device first passes through the first frequency amplitude converter of the first branch to obtain the third signal after mixing the first signal and the first local oscillator signal. The first amplitude information. Then, the receiving device demodulates the second local oscillator signal and the fourth signal after mixing the second signal through the second branch, where the second local oscillator signal is based on the first amplitude information. The signal obtained after frequency offset correction of the signal. Since the first local oscillator signal has a frequency offset, setting the linear working range corresponding to the first frequency amplitude converter of the first branch to be larger than the linear working range corresponding to the second frequency amplitude converter can make the third The frequency of the third signal after mixing the first signal and the first local oscillator signal will not exceed the linear working range corresponding to the first frequency amplitude converter, so that the first frequency amplitude converter can accurately obtain the third signal of the third signal. One amplitude information is used to accurately correct the frequency offset of the first local oscillator signal based on the first amplitude information.

Further, the receiving device demodulates the second local oscillator signal and the fourth signal after mixing the second signal through the second branch. Since the second local oscillator signal is a signal obtained by correcting the frequency offset of the first local oscillator signal, the frequency offset value of the fourth signal is smaller than the frequency offset of the signal after mixing the first local oscillator signal and the second signal. value, in this way, by setting the linear working interval corresponding to the second frequency amplitude converter of the second branch to be smaller than the linear working interval corresponding to the first frequency amplitude converter, the fourth signal can still be accurately demodulated. Furthermore, the demodulation performance of the receiving device will not be seriously affected.

In another example, the receiving device includes a first branch and a second branch, the first branch includes a first filter, the second branch includes a second filter, and the passband bandwidth of the second filter is smaller than the first filter. The passband bandwidth of the filter.

It should be noted that the embodiments of the present application do not limit the types of the first filter and/or the second filter. For example, the first filter and/or the second filter may be a band pass filter or a low pass filter.

In this example, the communication method 800 also includes S830-B and S840-B. The following introduces S830-B and S840-B in detail.

S830-B: The receiving device filters the third signal through the first filter. The third signal is a signal obtained by mixing the first signal and the first local oscillator signal.

S840-B, the receiving device filters the fourth signal through the second filter. The fourth signal is the signal obtained by mixing the second signal and the second local oscillator signal. Wherein, the second local oscillator signal is a signal obtained by performing frequency offset correction on the first local oscillator signal based on the first amplitude information of the third signal.

According to the relevant descriptions of S830-B and S840-B above, the receiving device first passes through the first filter of the first branch to filter the third signal obtained by mixing the first signal and the first local oscillator signal. . Then, the receiving device passes the second filter of the second branch to filter the fourth signal obtained by mixing the second signal and the second local oscillator signal. The second local oscillator signal is a signal obtained by performing frequency offset correction on the first local oscillator signal based on the first amplitude information of the third signal. Since the first local oscillator signal has a frequency offset, the passband bandwidth of the first filter of the first branch is set to be larger than the passband bandwidth of the second filter, so that even if the first local oscillator signal has a frequency offset In this case, the first filter still does not filter out the third signal, and then the frequency offset correction of the first local oscillator signal can be performed based on the third signal.

Further, the receiving device filters the fourth signal obtained by mixing the second signal and the second local oscillator signal through the second filter of the second branch. Since the second local oscillator signal is a signal obtained by correcting the frequency offset of the first local oscillator signal, the frequency offset value of the fourth signal is smaller than the frequency offset of the signal obtained by mixing the first local oscillator signal and the second signal. offset value, in this way, the passband bandwidth corresponding to the second filter of the second branch (relative to the passband bandwidth of the first filter) is set to Set to a smaller bandwidth to ensure that the second filter will not filter out the fourth signal under the residual frequency offset. At the same time, because the second filter has a narrow passband, it can filter out-of-band noise and reduce the quality of the receiving equipment. noise level, thereby improving the demodulation performance of the fourth signal by the receiving device.

Optionally, in this example, the first branch of the receiving device further includes a first frequency amplitude converter. At this time, between S830-B and S840-B, the communication method 800 also includes S830-A. For instructions on S830-A, refer to the relevant instructions above and will not be repeated here.

It should be noted that in this example, first, the third signal described in S830-A is the third signal obtained after filtering the third signal by the first filter. Second, on the basis of the S830-A described above, some optional solutions are also applicable to the S830-A in this example, and will not be described again here. Third, the internal structure of the first frequency-to-amplitude converter is the same as the internal structure of the first frequency-to-amplitude converter described above. For undescribed parts of the first frequency-to-amplitude converter, please refer to the above. The relevant description of the first frequency amplitude converter will not be described again here.

Optionally, in this example, the second branch of the receiving device further includes a second frequency amplitude converter, and the linear working interval corresponding to the second frequency amplitude converter is smaller than the linear working interval corresponding to the first frequency amplitude converter. working area. At this time, after S840-B, the communication method 800 also includes S840-A. For instructions on S840-A, refer to the relevant instructions above and will not be repeated here.

It should be noted that in this example, first, the fourth signal described in S840-A is the fourth signal obtained after filtering the fourth signal by the second filter. Second, on the basis of the S840-A described above, some optional solutions are also applicable to the S840-A in this example, and will not be described again here. Third, the internal structure of the second frequency-to-amplitude converter is the same as the internal structure of the second frequency-to-amplitude converter described above. For undescribed parts of the second frequency-to-amplitude converter, please refer to the above. The relevant description of the second frequency amplitude converter will not be described again here.

Regarding the reasons for setting the linear working interval corresponding to the second frequency amplitude converter to be smaller than the linear working interval corresponding to the first frequency amplitude converter, and how to set the linear working interval corresponding to the second frequency amplitude converter to be smaller than The linear working interval corresponding to the first frequency amplitude converter and the technical effect brought about by setting the linear working interval corresponding to the second frequency amplitude converter to be smaller than the linear working interval corresponding to the first frequency amplitude converter can be Refer to the above reasons for setting the linear working interval corresponding to the second frequency amplitude converter to be smaller than the linear working interval corresponding to the first frequency amplitude converter, and how to set the linear working interval corresponding to the second frequency amplitude converter. is smaller than the linear working interval corresponding to the first frequency amplitude converter, and the technical effect brought about by setting the linear working interval corresponding to the second frequency amplitude converter to be smaller than the linear working interval corresponding to the first frequency amplitude converter , we won’t go into details here.

It should be noted that in the communication method 800, after receiving the first signal and/or the second signal, the receiving device may also perform at least one of the following steps: (1) processing the received first signal and/or the second signal Perform filtering (such as radio frequency bandpass filtering); (2) Filter the amplitude information obtained by the first frequency amplitude converter and/or the second frequency amplitude converter (such as low-pass filtering); (3) Filter amplify the subsequent first signal and/or second signal (such as radio frequency signal amplification); (4) amplify the third signal and/or fourth signal (such as intermediate frequency signal amplification).

According to the above description of the communication method 800, in the communication method 800, the sending device first instructs the receiving device to perform frequency offset correction on the local oscillator signal generated by the receiving device by sending a first signal. Then, the sending device instructs the receiving device to enter the connection state by sending a second signal, that is, instructs the receiving device to receive the data sent by the sending device. That is to say, the sending device needs to send two signals (the first signal and the second signal) to the receiving device, so that the receiving device can perform frequency offset correction and correction of the local oscillator signal generated by the receiving device based on the two received signals. The received signal is demodulated in order to access the connected state.

Further, in order to reduce the signaling overhead of the sending device without affecting the demodulation performance of the receiving device, the sending device It is also possible to send only one signal (the second signal), and the signal adopts the differential frequency modulation modulation method. In this way, the receiving device can perform frequency offset correction on the local oscillator signal generated by the receiving device based on the received signal. The signal is demodulated in order to access the connected state. At this time, the specific process of the communication method is shown in Figure 11.

Figure 11 is a schematic flow chart of an example communication method 900 provided by the embodiment of the present application.

For example, as shown in Figure 11, the communication method 900 includes S910 and S920. The S910 and S920 are described in detail below.

S910: The sending device modulates the second signal using a differential frequency modulation modulation method.

The second signal is used to instruct the receiving device to enter the connection state with the access device.

For the description of the second signal and the specific process of S910, please refer to the relevant description in S820 above, and will not be described again here.

S920: The sending device uses frequency division multiplexing to send the modulated second signal and data to the receiving device. Correspondingly, the receiving device receives the modulated second signal and data.

It should be noted that this application is not limited to the sending device sending the second signal and data to the receiving device in a frequency division multiplexing manner. It may also send the second signal and data in a time division manner.

Optionally, in some embodiments, in S920, the sending device may also only send the modulated second signal to the receiving device. After that, if the sending device has data to send to the receiving device, the sending device then sends data to the receiving device. If the sending device has no data to send to the receiving device, the sending device will not send data to the receiving device. For a description of the specific process of S920, please refer to the relevant description in S820 above, and will not be described again here.

Relative to the communication method 800, in the communication method 900, the sending device only needs to send a signal (the second signal) to the receiving device, and the access device can demodulate the signal and then enter the connected state. In this way, the signaling overhead of the sending device can be reduced. In addition, because the time interval between the two time units before and after is very short, even if there is a residual frequency offset in the local oscillator signal generated by the receiving device, the residual frequency offset of the local oscillator signal generated in the two time units before and after can be considered to be the same. In this way, The sending device adopts a differential FM modulation method for the second signal, and the receiving device can subtract the frequencies of the second signal in the two time units before and after (i.e., the differential FM modulation method), so that the residual of the local oscillator signal generated by the receiving device can be The frequency offset is offset, thereby not affecting the demodulation performance of the receiving device.

Optionally, after the receiving device receives the second signal, the receiving device may further process the second signal.

It should be noted that in this example, the internal structure of the first frequency-to-amplitude converter is the same as the internal structure of the first frequency-to-amplitude converter described above. For the description part, reference may be made to the relevant description of the first frequency amplitude converter above, which will not be described again here.

In this example, the communication method 900 also includes S930-A and S940-A. The following introduces S930-A and S940-A in detail.

S930-A, the receiving device obtains the second amplitude information of the fifth signal through the first frequency amplitude converter. The fifth signal is a signal obtained by mixing the second signal and the first local oscillator signal.

By replacing the third signal in S830-A above with the fifth signal, the relevant description of S930-A can be obtained, and therefore will not be described again here.

It should be noted that in this example, based on the S830-A mentioned above, some optional solutions are also the same. It also applies to the S930-A in this example and will not be described again here.

S940-A, the receiving device demodulates the sixth signal through the second branch. The sixth signal is the signal obtained by mixing the second signal and the second local oscillator signal. The second local oscillator signal is based on the second amplitude. The signal obtained by correcting the frequency offset of the first local oscillator signal.

Replace the relevant description in S840-A above with the following two points: (1) Replace the first amplitude information with the second amplitude information, and replace the first frequency offset value with the second frequency offset value; (2) ) By replacing the fourth signal with the sixth signal, the relevant description of S940-A can be obtained, so it will not be described again here.

It should be noted that in this example, on the basis of S840-A described above, some optional solutions are also applicable to S940-A in this example, and will not be described again here.

In this example, the communication method 900 also includes S930-B and S940-B. The following introduces S930-B and S940-B in detail.

S930-B: The receiving device filters the fifth signal through the first filter. The fifth signal is a signal obtained by mixing the second signal and the first local oscillator signal.

By replacing the third signal in S830-B above with the fifth signal, the relevant description of S930-B can be obtained, and therefore will not be described again here.

It should be noted that in this example, on the basis of S830-B described above, some optional solutions are also applicable to S930-B in this example, and will not be described again here.

S940-B, the receiving device filters the sixth signal through the second filter. The sixth signal is the signal obtained by mixing the second signal and the second local oscillator signal. Wherein, the second local oscillator signal is a signal obtained by performing frequency offset correction on the first local oscillator signal based on the second amplitude information of the fifth signal.

By replacing the fourth signal with the sixth signal and the third signal with the fifth signal described in S940-B above, the relevant description of S940-A can be obtained, and therefore will not be described again here.

Regarding the reasons for setting the passband bandwidth of the second filter to be smaller than the passband bandwidth of the first filter, and the consequences of setting the passband bandwidth of the second filter to be smaller than the passband bandwidth of the first filter For technical effects, please refer to the relevant instructions above and will not be repeated here.

Optionally, in this example, the second branch of the receiving device further includes a second frequency amplitude converter, and the linear working interval corresponding to the second frequency amplitude converter is smaller than the linear working interval corresponding to the first frequency amplitude converter. working area. At this time, after S940-B, the communication method 900 also includes S940-A. For instructions on S940-A, refer to the relevant instructions above and will not be repeated here.

It should be noted that in this example, first, the sixth signal described in S940-A is the sixth signal obtained by filtering the fourth signal by the second filter. Second, based on the S940-A described above, some optional solutions are also applicable to the S940-A in this example, and will not be described again here. Third, the internal structure of the second frequency-to-amplitude converter is the same as the internal structure of the second frequency-to-amplitude converter described above. For undescribed parts of the second frequency-to-amplitude converter, please refer to the above. The relevant description of the second frequency amplitude converter will not be described again here.

Regarding setting the linear operating interval corresponding to the second frequency-amplitude converter to be smaller than the pair of first frequency-amplitude converters The reasons for the corresponding linear working interval, how to set the linear working interval corresponding to the second frequency amplitude converter to be smaller than the linear working interval corresponding to the first frequency amplitude converter, and how to set the corresponding linear working interval of the second frequency amplitude converter to The technical effect brought about by setting the linear working interval to be smaller than the linear working interval corresponding to the first frequency amplitude converter can be referred to the above to set the linear working interval corresponding to the second frequency amplitude converter to be smaller than the first frequency amplitude. The reason for the linear working range corresponding to the converter, how to set the linear working range corresponding to the second frequency amplitude converter to be smaller than the linear working range corresponding to the first frequency amplitude converter, and how to set the linear working range corresponding to the second frequency amplitude converter to The technical effect brought about by setting the corresponding linear working interval to be smaller than the corresponding linear working interval of the first frequency amplitude converter will not be described again here.

It should be noted that in the communication method 900, after receiving the second signal, the receiving device may also perform at least one of the following steps: (1) filtering the received second signal (such as radio frequency bandpass filtering); (2) ) Filter the amplitude information obtained by the first frequency amplitude converter and/or the second frequency amplitude converter (such as low-pass filtering); (3) Amplify the filtered second signal (such as radio frequency signal amplification) ); (4) Amplify the fifth signal and/or the sixth signal (such as intermediate frequency signal amplification).

In another example, in order to reduce the complexity and cost of the system of the receiving device, only one line is set in the receiving device, and a linear working interval is set on one line that can be adjusted with the frequency offset of the local oscillator signal generated by the communication device. Frequency to amplitude converter. In this way, the communication device only needs to pass through one path and one frequency amplitude converter, which can not only correct the frequency offset of the local oscillator signal generated by the communication device, but also accurately demodulate the signal received by the communication device.

In this example, the communication method 900 also includes S930-C and S940-C. The following introduces S930-C and S940-C in detail.

S930-C, the frequency-amplitude converter of the receiving device uses the first linear working interval to obtain the second amplitude information of the fifth signal. The fifth signal is a signal obtained by mixing the second signal and the first local oscillator signal.

S940-C, the frequency-to-amplitude converter of the receiving device uses the second linear operating interval to demodulate the sixth signal. Wherein, the sixth signal is a signal obtained by mixing the second signal and the second local oscillator signal, and the second local oscillator signal is a signal obtained by frequency offset correction of the first local oscillator signal based on the second amplitude information. The second linear working interval is smaller than the first linear working interval.

It should be noted that when the receiving device is in a non-connected state, the frequency-to-amplitude converter 1410 of the receiving device adopts the first linear working interval by default.

As mentioned above, the receiving device first obtains the second amplitude information of the fifth signal after mixing the second signal and the first local oscillator signal through the frequency-amplitude converter using the first linear working range. Then, the receiving device demodulates the second local oscillator signal and the sixth signal after mixing the second signal through the frequency-amplitude converter using the second linear working interval, wherein the second local oscillator signal is based on the second signal. The signal obtained by correcting the frequency offset of the first local oscillator signal using two amplitude information. Since the first local oscillator signal has a frequency offset, setting the first linear working interval corresponding to the frequency amplitude converter to be larger than the second linear working interval can make the second signal and the first local oscillator signal mixed. The frequency of the fifth signal will not exceed the second linear working range corresponding to the frequency-amplitude converter, so that the frequency-amplitude converter can accurately obtain the second amplitude information of the fifth signal, so that subsequent steps can be based on the second amplitude information. Accurately correct the frequency offset of the first local oscillator signal.

Further, the receiving device demodulates the second local oscillator signal and the sixth signal after mixing the second signal by using a frequency-amplitude converter in a second linear working interval. Since the second local oscillator signal is a signal obtained by correcting the frequency offset of the first local oscillator signal, the frequency offset value of the sixth signal is smaller than the frequency offset of the signal after mixing the first local oscillator signal and the second signal. value, in this way, even if the second linear working interval (relative to the first linear working interval) corresponding to the frequency-amplitude converter is set smaller, the sixth signal can still be accurately demodulated. Furthermore, the demodulation performance of the receiving device will not be seriously affected.

Optionally, in an example, between S930-C and S940-C, the communication method 900 also includes: S950-C, The receiving device adjusts the linear working interval corresponding to the frequency amplitude converter from the first linear working interval to the second linear working interval.

The receiving device also includes a frequency offset estimation module. S950-C specifically includes: the frequency amplitude converter sends the second amplitude information to the frequency offset estimation module; the frequency offset estimation module obtains the second frequency offset value based on the second amplitude information, And when the second frequency offset value is less than the preset frequency offset value, a control signal is sent to the frequency offset estimation module. The control signal is used to instruct the frequency amplitude converter to reduce its corresponding linear working interval; the frequency amplitude The converter adjusts the linear working interval corresponding to the frequency-amplitude converter from the first linear working interval to the second linear working interval.

The embodiment of the present application does not limit the specific value of the preset frequency offset value, which can be determined according to the actual situation.

Optionally, in this example, the frequency-to-amplitude converter includes a first capacitor, an RLC resonator and a multiplier. The signal S(t) input to the frequency-amplitude converter is divided into two channels. One channel directly enters the multiplier, and the other channel enters the first capacitor, and is combined with the signal generated by the RLC resonator to form the signal Sp(t). The signal Sp( t) then enters the multiplier to mix with the signal S(t) to obtain the mixed signal S(t)Sp(t). Among them, the other end of the RLC resonator is grounded.

Optionally, in one example, the RLC resonator includes a second capacitor, an inductor, and a variable resistor respectively connected in parallel. The frequency f _c of the resonant signal generated by the RLC resonator satisfies:

Among them, L is the inductance value of the inductor, and C is the capacitance value of the second capacitor. f _c is also the frequency of signal S(t).

After the signal S(t) passes through the phase shift module, the signal Sp(t) is obtained. The signal Sp(t) then enters the multiplier and is mixed with the signal S(t) to obtain the mixed signal S(t)Sp(t). .

The phase φ _rot (f) rotated by the frequency-amplitude converter on the signal S(t) satisfies the following formula:

Among them, R is the resistance value of the variable resistor, and -2πf _c RC is the slope of the frequency amplitude transfer curve corresponding to the frequency amplitude converter. It can be seen that the slope of the frequency-amplitude conversion curve is negatively linearly related to the resistance value R of the variable resistor. Then, the frequency-amplitude conversion curve can be adjusted by adjusting the resistance value R of the variable resistor. Slope adjustment.

According to the above description, it can be seen that the linear working range corresponding to the frequency-amplitude converter is related to the slope of the frequency-amplitude conversion curve. The greater the slope of the frequency-amplitude conversion curve, the smaller the linear working range corresponding to the frequency-amplitude converter. . Therefore, if you want to adjust the first linear operating interval to a smaller second linear operating interval, you can increase the slope of the frequency-amplitude conversion curve of the frequency-to-amplitude converter. Furthermore, since the slope of the frequency-amplitude conversion curve is negatively linearly related to the resistance value R of the variable resistor, then the resistance value of the resistor R in the frequency-amplitude converter can be increased to achieve the frequency-amplitude conversion. The purpose of increasing the slope of the frequency-amplitude conversion curve of the converter is to achieve the purpose of reducing the linear working range corresponding to the frequency-amplitude converter.

It should be noted that the specific process of S930-C is similar to the specific process of S930-A. Please refer to the relevant description of S930-A above and will not be repeated here. Also, the specific process of S940-C is similar to the specific process of S940-A. Please refer to the relevant description of S940-A above, which will not be described again here.

In another example, in order to reduce the complexity and cost of the system of the receiving device, only one line is set in the receiving device, and a filter whose bandwidth can be adjusted according to the frequency offset of the local oscillator signal generated by the receiving device is set on one line. device. In this way, the receiving device only needs to pass through one path and one filter, which can not only filter the mixed local oscillator signal before correction and the received signal, but also filter the local oscillator signal after correction and the received signal. The mixed signal is filtered.

In this example, the communication method 900 also includes S930-D and S940-D. The following introduces S930-D and S940-D in detail.

S930-D, the filter of the receiving device uses the first bandwidth to filter the fifth signal. The fifth signal is the signal obtained by mixing the second signal and the first local oscillator signal.

It should be noted that the specific process of S930-D is similar to that of S930-B. Please refer to the relevant description of S930-B above and will not be repeated here.

Optionally, in one example, after S930-D, the communication method 900 further includes S930-C described above. At this time, the fifth signal described in S930-C is the fifth signal obtained by filtering the fifth signal using the first bandwidth by the filter described in S930-D.

S940-D, the receiving device's filter uses the second bandwidth to filter the sixth signal. Wherein, the sixth signal is a signal obtained by mixing the second signal and the second local oscillator signal, and the second local oscillator signal is obtained by performing frequency offset correction on the first local oscillator signal based on the second amplitude information of the fifth signal. signal, the second bandwidth is smaller than the first bandwidth.

It should be noted that the specific process of S940-D is similar to the specific process of S940-B. Please refer to the relevant description of S940-B above and will not be repeated here.

Optionally, in one example, after S940-D, the communication method 900 further includes S940-C described above. At this time, the sixth signal described in S940-C is the sixth signal obtained by filtering the sixth signal using the second bandwidth by the filter described in S940-D.

Optionally, in one example, in the case where the communication method 900 includes S930-C and/or S940-C, the above-mentioned optional solutions relying on S930-C and/or S940-C are also applicable to This example will not be repeated here.

It should be noted that in the communication method 800, the first branch and the second branch work in time-sharing. In the communication method 900, the first branch and the second branch work simultaneously.

In one example, time-sharing operation of two branches can be achieved through switches. Specifically, each branch is provided with at least one switch. When one of the two branches is required to work, the switch in the branch can be closed so that the branch can be connected to other modules of the communication device. When the other branch of the two branches is required to work, the switch in the branch can be opened and the switch in the other branch can be closed so that the branch is connected to the communication device. The other modules are disconnected, and the other branch is connected to other modules of the communication device.

Next, the device provided by the embodiment of the present application will be described in detail with reference to FIG. 12 and FIG. 13 .

Figure 12 is a schematic structural diagram of an example device 1000 provided by an embodiment of the present application.

Exemplarily, the apparatus 1000 may be provided in the sending device or receiving device described in the above embodiments.

For example, as shown in Figure 12, the device 1000 includes a transceiver unit 1010, and the transceiver unit 1010 can communicate with the outside. The transceiver unit 1010 may also be called a communication interface or a communication unit.

Optionally, the device 1000 may also include a processing unit 1020 for data processing.

Optionally, the device 1000 may further include a storage unit, which may be used to store instructions and/or data, and the processing unit 1020 may read the instructions and/or data in the storage unit.

In an implementable manner, the device 1000 can be used to perform the actions performed by the sending device in the above method embodiment. In this case, the device 1000 can be a sending device or a component that can be configured in the sending device, a transceiver unit. The processing unit 1010 is used to perform transceiver-related operations on the sending device side in the above method embodiment, and the processing unit 1020 is used to perform processing-related operations on the sending device side in the above method embodiment.

In another implementable manner, the device 1000 can be used to perform the actions performed by the receiving device in the above method embodiment. In this case, the device 1000 can be a receiving device or a component that can be configured in the receiving device. one The unit 1010 is used to perform transceiver-related operations on the receiving device side in the above method embodiment, and the processing unit 1020 is used to perform processing-related operations on the receiving device side in the above method embodiment.

Figure 13 shows a schematic structural diagram of the device 1100 provided by the embodiment of the present application.

Illustratively, the apparatus 1100 may be provided in the sending device or receiving device described in the above embodiment.

As shown in Figure 13, the device 1100 includes: one or more processors 1110, one or more memories 1120, the one or more memories 1120 store one or more computer programs, the one or more computer programs Includes instructions. When the instruction is executed by the one or more processors 1110, the device 1100 is caused to perform the technical solution performed by the sending device in the above embodiment or the device 1100 is caused to perform the technology performed by the receiving device in the above embodiment. plan.

Embodiments of the present application provide a communication system, including a sending device and a receiving device, and the system is used to implement the technical solutions in the above embodiments. The implementation principles and technical effects are similar to the above-mentioned method-related embodiments, and will not be described again here.

Embodiments of the present application provide a computer program product. When the computer program product is run on a device, it causes the device to execute the technical solutions in the above embodiments. The implementation principles and technical effects are similar to the above-mentioned method-related embodiments, and will not be described again here. Wherein, the device may include the sending device or receiving device described in the above embodiment.

Embodiments of the present application provide a readable storage medium. The readable storage medium contains instructions. When the instructions are run on a device, they cause the device to execute the technical solutions of the above embodiments. The implementation principles and technical effects are similar and will not be described again here. Wherein, the device may include the sending device or receiving device described in the above embodiment.

Embodiments of the present application provide a chip. The chip is used to execute instructions. When the chip is running, the technical solutions in the above embodiments are executed. The implementation principles and technical effects are similar and will not be described again here.

Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of the embodiments of the present application.

Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be described again here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application can be integrated into one processing unit, each unit can exist physically alone, or two or more units can be integrated into one unit.

If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiments of the present application is essentially or contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions to cause a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program code. .

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application. should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A communication method, characterized in that the communication method includes:

Using frequency division multiplexing, the first signal and the first data are sent, and the first signal is used to assist the receiving device in correcting the frequency offset of the local oscillator signal generated by the receiving device;

Use frequency division multiplexing to send a second signal and second data, where the second signal is used to instruct the receiving device to enter a connected state;

Wherein, the first transmission parameter of the first signal and the second transmission parameter of the second signal are configured separately, and the first transmission parameter and the second transmission parameter are of the same type,

The first transmission parameter includes at least one of the following: a first frequency guard interval between the first signal and the first data, a modulation order of the first signal, and a transmission power of the first signal. ,

The second transmission parameter includes at least one of the following: a second frequency guard interval between the second signal and the second data, a modulation order of the second signal, and a transmission power of the second signal. .
The communication method according to claim 1, wherein the first signal adopts a differential frequency modulation modulation method, and/or the second signal adopts a differential frequency modulation modulation method.
The communication method according to claim 2, characterized in that before using frequency division multiplexing to send the second signal and the second data, the communication method further includes:

Modulate the second signal according to the first frequency difference mapped by every N bits in the sequence of the second signal;

Wherein, N=log 2 M, where M is the modulation order of the second signal;

The first frequency difference is the frequency difference between the second signals in two adjacent time units;

The frequency f(i) of the second signal in the i-th time unit=mod[f(i-1)+Δf(i),B1], where Δf(i) is the sequence of the second signal The first frequency difference between the i-th second signal and the (i-1)-th second signal, where B1 is a preset first bandwidth value, and i is an integer greater than 1.
The communication method according to claim 2 or 3, characterized in that, before transmitting the first signal and the first data using frequency division multiplexing, the communication method further includes:

Modulate the first signal according to the second frequency difference mapped by each P bits in the sequence of the first signal;

Wherein, P=log 2 Q, the Q is the modulation order of the first signal;

The second frequency difference is the frequency difference between the first signals in two adjacent time units;

The frequency f(j) of the first signal in the jth time unit=mod[f(j-1)+Δf 1 (j), B2], and the Δf 1 (j) is the first The second frequency difference between the j-th first signal and the (j-1)-th first signal in the signal sequence, B2 is a preset second bandwidth value, and j is greater than 1 integer.
The communication method according to any one of claims 1 to 4, characterized in that:

The first frequency guard interval is greater than the second frequency guard interval; and/or,

The modulation order of the first signal is lower than the modulation order of the second signal, or the first signal is a single frequency signal, or the modulation order of the first signal is 2; and/ or,

The transmission power of the first signal is higher than the transmission power of the second signal.
A communication method, characterized in that the communication method includes:

Send a first signal, the first signal is used to assist the receiving device in correcting the frequency offset of the local oscillator signal generated by the receiving device, and the first signal adopts a differential frequency modulation modulation method;

Send a second signal, the second signal is used to instruct the receiving device to enter the connection state, and the second signal adopts a differential frequency modulation modulation method.
The communication method according to claim 6, characterized in that, before sending the first signal, the communication method further includes:

Modulate the first signal according to the second frequency difference mapped by each P bits in the sequence of the first signal;

Wherein, P=log 2 Q, the Q is the modulation order of the first signal;

The second frequency difference is the frequency difference between the first signals in two adjacent time units;

The frequency f(j) of the first signal in the jth time unit=mod[f(j-1)+Δf 1 (j), B2], and the Δf 1 (j) is the first The second frequency difference between the j-th first signal and the (j-1)-th first signal in the signal sequence, B2 is a preset second bandwidth value, and j is greater than 1 integer.
The communication method according to claim 6 or 7, characterized in that, before sending the second signal, the communication method further includes:

Modulate the second signal according to the first frequency difference mapped by every N bits in the sequence of the second signal;

Wherein, N=log 2 M, where M is the modulation order of the second signal;

The first frequency difference is the frequency difference between the second signals in two adjacent time units;

The frequency f(i) of the second signal in the i-th time unit=mod[f(i-1)+Δf(i),B1], where Δf(i) is the sequence of the second signal The first frequency difference between the i-th second signal and the (i-1)-th second signal, where B1 is a preset first bandwidth value, and i is an integer greater than 1.
A communication method, characterized in that the communication method includes:

The second signal is modulated using a differential frequency modulation modulation method. The second signal is used to assist the receiving device in correcting the frequency offset of the local oscillator signal generated by the receiving device. The second signal is also used to indicate the The receiving device performs frequency offset correction on the local oscillator signal generated by the receiving device and then enters the connected state;

The modulated second signal is sent.
The communication method according to claim 9, characterized in that the modulation method using differential frequency modulation to modulate the second signal includes:

Modulate the second signal according to the first frequency difference mapped by every N bits in the sequence of the second signal;

Wherein, N=log 2 M, where M is the modulation order of the second signal;

The first frequency difference is the frequency difference between the second signals in two adjacent time units;

The frequency f(i) of the second signal in the i-th time unit=mod[f(i-1)+Δf(i),B1], where Δf(i) is the sequence of the second signal The first frequency difference between the i-th second signal and the (i-1)-th second signal, where B1 is a preset first bandwidth value, and i is an integer greater than 1.
A communication device, characterized in that the communication device includes:

A transceiver unit, configured to send a first signal and first data in a frequency division multiplexing manner, where the first signal is used to assist the receiving device in correcting the frequency offset of the local oscillator signal generated by the receiving device;

The transceiver unit is also configured to use frequency division multiplexing to send a second signal and second data. The second signal Used to instruct the receiving device to enter the connected state;

Wherein, the first transmission parameter of the first signal and the second transmission parameter of the second signal are configured separately, and the first transmission parameter and the second transmission parameter are of the same type,

The first transmission parameter includes at least one of the following: a first frequency guard interval between the first signal and the first data, a modulation order of the first signal, and a transmission power of the first signal. ,

The second transmission parameter includes at least one of the following: a second frequency guard interval between the second signal and the second data, a modulation order of the second signal, and a transmission power of the second signal. .
The communication device according to claim 11, wherein the first signal adopts a differential frequency modulation modulation method, and/or the second signal adopts a differential frequency modulation modulation method.
The communication device according to claim 12, characterized in that the communication device further includes:

A processing unit configured to modulate the second signal according to the first frequency difference mapped by every N bits in the sequence of the second signal;

Wherein, N=log 2 M, where M is the modulation order of the second signal;

The first frequency difference is the frequency difference between the second signals in two adjacent time units;

The frequency f(i) of the second signal in the i-th time unit=mod[f(i-1)+Δf(i),B1], where Δf(i) is the sequence of the second signal The first frequency difference between the i-th second signal and the (i-1)-th second signal, where B1 is a preset first bandwidth value, and i is an integer greater than 1.
The communication device according to claim 12 or 13, characterized in that the communication device further includes:

A processing unit configured to modulate the first signal according to the second frequency difference mapped by each P bits in the sequence of the first signal;

Wherein, P=log 2 Q, the Q is the modulation order of the first signal;

The second frequency difference is the frequency difference between the first signals in two adjacent time units;

The frequency f(j) of the first signal in the jth time unit=mod[f(j-1)+Δf 1 (j), B2], and the Δf 1 (j) is the first The second frequency difference between the j-th first signal and the (j-1)-th first signal in the signal sequence, B2 is a preset second bandwidth value, and j is greater than 1 integer.
The communication device according to any one of claims 11 to 14, characterized in that:

The first frequency guard interval is greater than the second frequency guard interval; and/or,

The modulation order of the first signal is lower than the modulation order of the second signal, or the first signal is a single frequency signal, or the modulation order of the first signal is 2; and/ or,

The transmission power of the first signal is higher than the transmission power of the second signal.
A communication device, characterized in that the communication device includes:

A transceiver unit configured to send a first signal. The first signal is used to assist the receiving device in correcting the frequency offset of the local oscillator signal generated by the receiving device. The first signal adopts a differential frequency modulation modulation method;

The transceiver unit is also configured to send a second signal. The second signal is used to instruct the receiving device to enter the connection state. The second signal adopts a differential frequency modulation modulation method.
The communication device according to claim 16, characterized in that the communication device further includes:

A processing unit configured to modulate the first signal according to the second frequency difference mapped by each P bits in the sequence of the first signal;

Wherein, P=log 2 Q, the Q is the modulation order of the first signal;

The second frequency difference is the frequency difference between the first signals in two adjacent time units;

The frequency f(j) of the first signal in the jth time unit=mod[f(j-1)+Δf 1 (j), B2], and the Δf 1 (j) is the first The second frequency difference between the j-th first signal and the (j-1)-th first signal in the signal sequence, B2 is a preset second bandwidth value, and j is greater than 1 integer.
The communication device according to claim 16 or 17, characterized in that the communication device further includes:

A processing unit configured to modulate the second signal according to the first frequency difference mapped by every N bits in the sequence of the second signal;

Wherein, N=log 2 M, where M is the modulation order of the second signal;

The first frequency difference is the frequency difference between the second signals in two adjacent time units;

The frequency f(i) of the second signal in the i-th time unit=mod[f(i-1)+Δf(i),B1], where Δf(i) is the sequence of the second signal The first frequency difference between the i-th second signal and the (i-1)-th second signal, where B1 is a preset first bandwidth value, and i is an integer greater than 1.
A communication device, characterized in that the communication device includes:

The transceiver unit is used to modulate the second signal using a differential frequency modulation modulation method. The second signal is used to assist the receiving device in correcting the frequency offset of the local oscillator signal generated by the receiving device. The second signal also Used to instruct the receiving device that the receiving device performs frequency offset correction on the local oscillator signal generated by the receiving device and then enters the connected state;

The transceiver unit is also configured to send the modulated second signal.
The communication device according to claim 19, characterized in that the communication device further includes:

A processing unit configured to modulate the second signal according to the first frequency difference mapped by every N bits in the sequence of the second signal;

Wherein, N=log 2 M, where M is the modulation order of the second signal;

The first frequency difference is the frequency difference between the second signals in two adjacent time units;

The frequency f(i) of the second signal in the i-th time unit=mod[f(i-1)+Δf(i),B1], where Δf(i) is the sequence of the second signal The first frequency difference between the i-th second signal and the (i-1)-th second signal, B1 is a preset first bandwidth value, and i is an integer greater than 1.
A communication device, characterized by including:

one or more processors;

one or more memories;

and one or more computer programs, wherein said one or more computer programs are stored in said one or more memories, said one or more computer programs include instructions that, when said instructions are processed by said one or more When a processor is executed, the communication device is caused to execute the communication method according to any one of claims 1 to 10.
A computer-readable storage medium, characterized in that it includes computer instructions, which when the computer instructions are run on a communication device, cause the communication device to perform the communication method according to any one of claims 1 to 10.
A chip, characterized in that it includes at least one processor and an interface circuit, the interface circuit is used to provide program instructions or data to the at least one processor, and the at least one processor is used to execute the program instructions to Implement the communication method according to any one of claims 1 to 10.