Communication system, communication method, and computer storage medium

Abstract

The embodiment of the application provides a communication system, a communication method and a computer storage medium, the communication system comprises at least two millimeter wave communication units, one of the millimeter wave communication units is a reference millimeter wave communication unit, a frequency synchronization channel is established between the reference millimeter wave communication unit and each of the other millimeter wave communication units, and the reference millimeter wave communication unit transmits a reference frequency to each of the other millimeter wave communication units through the frequency synchronization channel; each of the millimeter wave communication units demodulates the received millimeter wave signal through a corresponding radio frequency module based on the reference frequency, so that the frequency difference intermodulation caused by the reverse leakage is eliminated, the situation that the received millimeter wave signal cannot be correctly demodulated due to the frequency difference intermodulation is avoided, and then the signal frequency stability is improved, and the received signal sensitivity is improved.

Description

Technical Field

[0001] This invention relates to the field of communications, and more particularly to a communication system, a communication method, and a computer storage medium. Background Technology

[0002] Millimeter-wave communication is an important topic in 5G technology, mainly used for high-capacity fronthaul / backhaul. Millimeter-wave communication systems use higher carrier frequencies and higher symbol rates during transmission to transmit larger amounts of information.

[0003] Millimeter-wave communication implementation schemes include superheterodyne and quadrature IQ modulation / demodulation schemes. Superheterodyne schemes require multi-stage frequency conversion, resulting in high circuit complexity. Furthermore, in millimeter-wave communication, especially in fully outdoor millimeter-wave equipment, the received signal requirements are high, further complicating the circuit design. Simply reducing the received signal requirements while maintaining demodulation quality necessitates increased circuit complexity, making superheterodyne schemes unsuitable for millimeter-wave communication systems.

[0004] When employing a quadrature IQ modulation / demodulation scheme, millimeter-wave communication systems, due to their higher frequencies, employ quadrature IQ modulation at the transmitting end to directly upconvert the baseband signal to the millimeter-wave band for a simplified architecture. At the receiving end, quadrature IQ demodulation downconverts the millimeter-wave signal back to the baseband. When the carrier frequency rises to the millimeter-wave band, the input IQ signal is directly upconverted to the millimeter wave, at which point the carrier signal is at the center of the spectrum. As the carrier frequency increases, leakage from the RF module / modulator / demodulator can degrade the transmitted signal quality, thus affecting the receiving sensitivity of the millimeter-wave communication system. For example, when the reverse leakage signal from the RF module / modulator / demodulator mixes with the normal signal, frequency intermodulation occurs, preventing proper demodulation of the received millimeter-wave signal. Summary of the Invention

[0005] The present invention provides a communication system, communication method, and computer storage medium that solves the problem of how to avoid frequency difference intermodulation, which would prevent the correct demodulation of received millimeter wave signals.

[0006] To address the aforementioned technical problems, embodiments of the present invention provide a communication system comprising at least two millimeter-wave communication units, each of which includes a radio frequency module;

[0007] One of the millimeter-wave communication units is a reference millimeter-wave communication unit. The reference millimeter-wave communication unit establishes a frequency synchronization channel with the other millimeter-wave communication units and transmits the reference frequency to the other millimeter-wave communication units through the frequency synchronization channel.

[0008] Each millimeter-wave communication unit demodulates the received millimeter-wave signal based on the reference frequency through the corresponding radio frequency module.

[0009] To address the aforementioned technical problems, embodiments of the present invention also provide a communication method, applied to the communication system described above, comprising:

[0010] Each of the millimeter-wave communication units receives millimeter-wave signals from the signal transmitting end;

[0011] For each millimeter-wave signal received, the millimeter-wave communication unit demodulates it using the corresponding radio frequency module based on the reference frequency.

[0012] To address the aforementioned technical problems, embodiments of the present invention also provide a communication method computer storage medium, wherein the computer storage medium stores at least one computer program, and the computer program, when executed by a processor, performs at least one step of the communication method described above.

[0013] Beneficial effects

[0014] This invention provides a communication system, a communication method, and a computer storage medium. The communication system includes at least two millimeter-wave communication units, one of which is a reference millimeter-wave communication unit. The reference millimeter-wave communication unit establishes a frequency synchronization channel with the other millimeter-wave communication units and transmits a reference frequency to the other millimeter-wave communication units through the frequency synchronization channel. Each millimeter-wave communication unit demodulates the received millimeter-wave signal based on the reference frequency through a corresponding radio frequency module, thereby eliminating frequency cross-modulation caused by reverse leakage of the modulator chip. This avoids the situation where the received millimeter-wave signal cannot be correctly demodulated due to frequency cross-modulation, thereby improving signal frequency stability and enhancing the sensitivity of the received signal.

[0015] Other features and corresponding beneficial effects of the present invention will be described in the latter part of the specification, and it should be understood that at least some of the beneficial effects will become obvious from the description in the specification. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the radio frequency module orthogonally IQ demodulating millimeter-wave signals in the related technology provided in Embodiment 1 of the present invention;

[0017] Figure 2 This is a schematic diagram of the communication system structure provided in Embodiment 1 of the present invention;

[0018] Figure 3 This is a schematic diagram of a communication system structure in Embodiment 1 of the present invention, where the reference frequency is the baseband frequency of the reference millimeter-wave communication unit.

[0019] Figure 4 This is a schematic diagram of a communication system structure in Embodiment 1 of the present invention, where the reference frequency is the radio frequency of the reference millimeter-wave communication unit.

[0020] Figure 5 This is a schematic diagram of the communication method provided in Embodiment 2 of the present invention. Figure 1 ;

[0021] Figure 6 This is a schematic diagram of the communication method provided in Embodiment 2 of the present invention. Figure 2 ;

[0022] Figure 7 This is a schematic diagram of the millimeter-wave communication unit structure provided in Embodiment 2 of the present invention;

[0023] Figure 8 This is a schematic diagram of a millimeter-wave communication system for a hot backup scenario provided in Embodiment 2 of the present invention;

[0024] Figure 9 This is a schematic diagram of a millimeter-wave communication system with cross-polarization cancellation scenario provided in Embodiment 2 of the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the embodiments of this invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0026] Example 1:

[0027] In related technologies, there is a problem where reverse leakage from the modulator chips within each millimeter-wave communication unit acting as the receiver leads to frequency cross-modulation, resulting in the inability to correctly demodulate the received millimeter-wave signal. For example, see... Figure 1 In the equation βcosω1t, β is the reverse leakage coefficient of the modem, which is constant once the modem chip is manufactured. The reverse leakage signal βcosω1t mixes with the normal signal s(t), thus producing frequency intermodulation. For example, in... Figure 1 In the transmission end, the IQ modulator upconverts a and b and outputs a normal signal s(t) = acosω0t - bsinω0t; at the receiving end of the communication system, due to reverse leakage doping into the s(t) signal, taking the I1 signal obtained by demodulating the I signal (where the demodulation process of Q1, I2 and Q2 is similar and will not be repeated here) as an example, the demodulation process is as follows (1):

[0028]

[0029] Where: βcosω1t is the reverse leakage of the local oscillator signal; ω1=ω0+Δω; visible:

[0030] (i) When the reverse leakage coefficient β is very small, at this time Therefore, I1 = a; however, based on existing technology, it is difficult to control the reverse leakage coefficient of all manufactured chips to meet the technical requirements;

[0031] (ii) When the reverse leakage coefficient β is large and Δω=0, I1=a+β, the calculation process is as shown in equation (2). It can be seen that if the frequencies between communication units are synchronized, the baseband signal will only be doped with a constant reverse leakage coefficient β. The reverse leakage coefficient β can be eliminated as a DC signal through the IQ calibration function inside the modem, thereby demodulating the signal normally and improving the sensitivity of the received signal.

[0032]

[0033] (iii) When the reverse leakage coefficient β is large and Δω≠0, The reason why the millimeter-wave system cannot correctly demodulate the received millimeter-wave signal at this point is that the baseband signal is mixed with intermodulation interference caused by frequency difference, i.e., frequency difference intermodulation has occurred. Therefore, how to avoid frequency difference intermodulation and thus prevent the correct demodulation of the received millimeter-wave signal is a technical problem that urgently needs to be solved.

[0034] The communication system of this embodiment includes at least two millimeter-wave communication units that can synchronize with a reference frequency, and each millimeter-wave communication unit demodulates the received millimeter-wave signal based on the reference frequency, thereby eliminating frequency difference intermodulation caused by reverse leakage of the modulator chip (i.e., reverse leakage and signal intermodulation), thereby improving signal frequency stability and enhancing the sensitivity of the received signal (i.e., the minimum signal strength that the receiver can receive and function normally).

[0035] In one application example, the communication system provided in this embodiment can be found in [link to relevant documentation]. Figure 2 As shown, it includes at least two millimeter-wave communication units, and each millimeter-wave communication unit includes a radio frequency (RF) module. Of course, in some application examples, these at least two millimeter-wave communication units can also serve as signal transmitters. In this case, the RF module, in addition to receiving millimeter-wave signals, can also be used to modulate and transmit millimeter-wave signals. It should be understood that in this embodiment, the signal demodulation module and signal modulation module of the millimeter-wave communication unit can be integrated into a single circuit or chip, or they can be two independent modules.

[0036] Furthermore, it should be understood that the number of millimeter-wave communication units included in the communication system in this embodiment can be flexibly set according to specific needs. For example, in one application scenario, the communication system may include two millimeter-wave communication units, which are paired communication units; in another application scenario, the communication system may also include three or more millimeter-wave communication units. It should also be understood that the relationship between the millimeter-wave communication units can be flexibly set according to the specific application scenario. For example, when the current application scenario is a hot-standby application scenario, one of the millimeter-wave communication units in the communication system is the primary millimeter-wave communication unit in the hot-standby application scenario, and the other communication units are backup millimeter-wave communication units in the hot-standby application scenario. When the current application scenario is a cross-polarization cancellation application scenario, the millimeter-wave communication units in the communication system can be respectively a horizontal millimeter-wave communication unit and a vertical millimeter-wave communication unit in the cross-polarization cancellation application scenario, and the reference millimeter-wave communication unit is either a horizontal millimeter-wave communication unit or a vertical millimeter-wave communication unit. In a 2x2 MIMO application scenario, the communication system includes two millimeter-wave communication units. One of these units is the first millimeter-wave communication unit in the 2x2 MIMO application scenario, and the other is the second millimeter-wave communication unit in the 2x2 MIMO application scenario. The reference millimeter-wave communication unit can be either the first or the second millimeter-wave communication unit. Similarly, in a 4x4 MIMO application scenario, the communication system includes two millimeter-wave communication units. One of these units is the first dual-transmit, dual-receive millimeter-wave communication unit in the 4x4 MIMOx application scenario, and the other is the second dual-transmit, dual-receive millimeter-wave communication unit in the 4x4 MIMOx application scenario. The reference millimeter-wave communication unit can be either the first or the second dual-transmit, dual-receive millimeter-wave communication unit.

[0037] In this embodiment, among the millimeter-wave communication units included in the communication system, one millimeter-wave communication unit is a reference millimeter-wave communication unit. The reference millimeter-wave communication unit establishes a frequency synchronization channel with the other millimeter-wave communication units and transmits the reference frequency to the other millimeter-wave communication units through the frequency synchronization channel, thereby completing the carrier synchronization between the millimeter-wave communication units in the communication system. Then, after each millimeter-wave communication unit receives a millimeter-wave signal in the millimeter-wave frequency band, it can demodulate the received millimeter-wave signal based on the reference frequency through the corresponding (i.e., each millimeter-wave communication unit's own) radio frequency module, thereby eliminating the frequency difference between the millimeter-wave communication units, that is, eliminating the frequency cross-modulation caused by the reverse leakage of the modulator chip in each millimeter-wave communication unit as the receiving end, and avoiding the situation where the received millimeter-wave signal cannot be correctly demodulated due to frequency cross-modulation.

[0038] In this embodiment, the aforementioned reference frequency can be a reference frequency injected into the reference millimeter-wave communication unit from outside the communication system; it can also be a frequency generated by the reference millimeter-wave communication unit itself, such as, but not limited to, the baseband frequency or radio frequency of the reference millimeter-wave communication unit. For ease of understanding, this embodiment will be described below using the baseband frequency and radio frequency of the reference millimeter-wave communication unit as examples, respectively.

[0039] For an example of a reference frequency for a reference millimeter-wave communication unit's baseband frequency, please refer to [link to example]. Figure 3 As shown, each millimeter-wave communication unit of the communication system includes a baseband subunit and a radio frequency subunit. In this example... Figure 3 The upper (or lower) millimeter-wave communication unit is the reference millimeter-wave communication unit; the baseband subunit includes a phase-locked loop module, a physical interface transceiver module, and a modulation / demodulation module; the radio frequency (RF) subunit includes an RF module and a frequency synthesizer phase-locked loop module; the frequency synchronization channels include a baseband frequency reference synchronization channel between millimeter-wave communication units and a frequency synthesizer synchronization channel for baseband frequency synchronization between baseband and RF subunits within the millimeter-wave communication unit, wherein:

[0040] The baseband frequency reference synchronization channel between millimeter-wave communication units is provided by Figure 3 The phase-locked loop module of the middle reference millimeter-wave communication unit consists of a channel established between the physical interface transceiver module and the phase-locked loop modules of other millimeter-wave communication units.

[0041] The frequency synchronization channel for baseband frequency synchronization between the baseband subunit and the radio frequency subunit within the millimeter-wave communication unit is composed of... Figure 3 The medium millimeter-wave communication unit consists of a phase-locked loop module, a frequency synthesis phase-locked loop module, and a radio frequency module, forming a channel between them.

[0042] In this embodiment, the physical interface transceiver module may include an Ethernet port. The baseband frequency reference synchronization channel between millimeter-wave communication units can be composed of a channel established between the phase-locked loop module of the reference millimeter-wave communication unit and the phase-locked loop modules of other millimeter-wave communication units through the Ethernet port. That is, the baseband frequency reference synchronization channel is formed by directly using the Ethernet port originally provided by the millimeter-wave communication unit without requiring structural modifications to the millimeter-wave communication unit. This method is minimally modified, easy to implement, low in cost, and has good versatility. Of course, in other application scenarios, new interfaces can also be set on the millimeter-wave communication unit to realize the communication connection between the phase-locked loop module of the reference millimeter-wave communication unit and the phase-locked loop modules of other millimeter-wave communication units.

[0043] For an example of a reference frequency for a reference millimeter-wave communication unit, please refer to [link to example]. Figure 4 As shown in this example Figure 4 The millimeter-wave communication unit at the top (or bottom) is the reference millimeter-wave communication unit. In this application example, the frequency synchronization channel includes the radio frequency reference synchronization channel between millimeter-wave communication units. The video frequency reference synchronization channel between millimeter-wave communication units consists of the channel established between the frequency synthesizer phase-locked loop module of the reference millimeter-wave communication unit and the frequency synthesizer phase-locked loop modules of other millimeter-wave communication units through the physical interface transceiver module. In some application scenarios, new interfaces can be set on the millimeter-wave communication units, or existing interfaces that meet communication performance requirements can be used to achieve communication connections between the frequency synthesizer phase-locked loop modules of the reference millimeter-wave communication unit and the frequency synthesizer phase-locked loop modules of other millimeter-wave communication units.

[0044] It should be understood that the specific millimeter-wave communication unit selected in the communication system of this embodiment can be flexibly set according to the specific application scenario. For example, when one of the millimeter-wave communication units in the communication system is the main millimeter-wave communication unit in a hot backup application scenario, and the other communication units are backup millimeter-wave communication units in a hot backup application scenario, the reference millimeter-wave communication unit can be set as the main millimeter-wave communication unit (of course, depending on the requirements, the reference millimeter-wave communication unit can also be set as one of the backup millimeter-wave communication units).

[0045] For example, when the millimeter-wave communication units in the communication system are the horizontal millimeter-wave communication unit and the vertical millimeter-wave communication unit in the cross-polarization cancellation application scenario, the reference millimeter-wave communication unit can be either the horizontal millimeter-wave communication unit in the communication system or the vertical millimeter-wave communication unit in the communication system.

[0046] Optionally, to improve the reliability and practicality of the communication system, after setting up the aforementioned reference millimeter-wave communication unit in the communication system and establishing a frequency synchronization channel between the reference millimeter-wave communication unit and other millimeter-wave communication units to achieve frequency synchronization among the millimeter-wave communication units, the reference millimeter-wave communication unit can also detect and track the frequency synchronization status. When a reference switching condition is detected, it sends a reference switching notification to at least one of the other reference millimeter-wave communication units; thereby causing one of the millimeter-wave communication units receiving the reference switching notification to switch to the reference millimeter-wave communication unit. It should be understood that:

[0047] The aforementioned reference switching notification can be sent through, but is not limited to, the aforementioned frequency synchronization channel, or through other communication channels between the reference millimeter-wave communication unit and other millimeter-wave communication units;

[0048] The aforementioned reference switching conditions may include, but are not limited to, a failure of the reference millimeter-wave communication unit.

[0049] For ease of understanding, this embodiment will still be described using the application scenarios of the above examples.

[0050] In a hot backup scenario for a millimeter-wave communication system, after scene identification and configuration as a hot backup scenario, the reference frequency synchronization between the primary and backup units (M / S Units, i.e., the primary millimeter-wave communication unit and the standby millimeter-wave communication unit) is set up as described above. For example, the primary millimeter-wave communication unit is set as the reference millimeter-wave communication unit, and its RF synchronization baseband frequency is set as the reference. In this application scenario, under hot backup conditions, if the primary millimeter-wave communication unit fails, a primary / backup switchover and clock switching are performed, switching to the new primary millimeter-wave communication unit as the new reference millimeter-wave communication unit; and alarm reporting can be completed according to the application scenario requirements.

[0051] In millimeter-wave communication cross-polarization cancellation scenarios, the scenario is identified and set as a cross-polarization cancellation scenario. The reference frequency synchronization between the horizontal / vertical units (H / V Unit, i.e., the horizontal millimeter-wave communication unit and the vertical millimeter-wave communication unit) is set up in the manner described above. For example, the main millimeter-wave communication unit is set as the reference millimeter-wave communication unit, and the RF synchronization baseband frequency of the horizontal millimeter-wave communication unit is set as the reference reference. In this scenario, if the clock of the horizontal millimeter-wave communication unit fails, the clock is switched, and the vertical millimeter-wave communication unit is used as the new reference millimeter-wave communication unit. Alarm reporting can also be completed according to the application scenario requirements.

[0052] In a 2*2 MIMO application scenario, the reference frequency synchronization between the first and second millimeter-wave communication units is set up as described above. For example, the first millimeter-wave communication unit is initially set as the reference millimeter-wave communication unit, and its RF synchronization baseband frequency is set as the reference. In this application scenario, if a fault is detected in the first millimeter-wave communication unit, a switchover is performed, replacing it with the second millimeter-wave communication unit as the new reference millimeter-wave communication unit. Alarm reporting can be completed according to the application scenario requirements.

[0053] In a 4x4 MIMOx application scenario, the reference frequency synchronization between the first and second dual-transmit / dual-receive millimeter-wave communication units is set as described above. For example, the second dual-transmit / dual-receive millimeter-wave communication unit is initially set as the reference millimeter-wave communication unit, and its RF synchronization baseband frequency is set as the reference. In this application scenario, if a fault is detected in the second dual-transmit / dual-receive millimeter-wave communication unit, a switchover is performed, replacing it with the first dual-transmit / dual-receive millimeter-wave communication unit as the new reference millimeter-wave communication unit. Alarm reporting can be completed according to the application scenario requirements.

[0054] In other words, in this embodiment, the reference millimeter-wave communication unit that provides the reference frequency can be dynamically switched. In the hot backup protection and cross-polarization cancellation scenarios of millimeter-wave communication, the reference frequency is used as a reference to synchronously solve frequency difference intermodulation interference, eliminate frequency difference intermodulation caused by reverse leakage, improve signal frequency stability, and improve the sensitivity of received signal.

[0055] Example 2:

[0056] For ease of understanding, this embodiment will be described below based on the communication system architecture shown in the above embodiments, using the communication method of that communication system as an example. Please refer to... Figure 5 As shown, the process includes:

[0057] S501: Identify application scenarios, match them according to the identification results, and complete the synchronization of the reference frequency.

[0058] For example, the system identifies hot backup application scenarios, cross-polarization cancellation application scenarios, and 2*2 MIMO or 4*4 MIMOx in millimeter-wave communication systems. Then, based on the identification results, the corresponding pairing of millimeter-wave communication units in the communication system is performed. Finally, the synchronization of the reference frequency is completed in the manner described above.

[0059] S502: Tracks and switches the reference frequency synchronization status.

[0060] For example, clock tracking and switching between the main and backup (M / S) units, horizontal and vertical (H / V) units, first and second millimeter-wave communication units, or first and second dual-transmit and dual-receive millimeter-wave communication units can be performed in the manner described above.

[0061] S503: The RF module of the millimeter-wave communication unit completes the DC calibration of the baseband IQ signal.

[0062] For details on signal reception and demodulation, please refer to [link to relevant documentation]. Figure 6 As shown, it includes:

[0063] S601: Each millimeter-wave communication unit receives millimeter-wave signals from the signal transmitting end.

[0064] S602: Each millimeter-wave communication unit demodulates each received millimeter-wave signal using a radio frequency module based on a reference frequency; the millimeter-wave signal can be demodulated using, but is not limited to, a quadrature IQ demodulation method.

[0065] Optionally, after the RF module demodulates the millimeter-wave signal using orthogonal IQ demodulation, the constant inverse coefficient β in the demodulated signal can be eliminated by using the IQ calibration function, treating it as a DC signal. For example, in some applications, after the RF module demodulates the millimeter-wave signal using orthogonal IQ demodulation, the constant inverse coefficient β in the demodulated signal can be directly eliminated by using the IQ calibration function, treating it as a DC signal. Alternatively, it can first determine whether the constant inverse coefficient β is greater than a set inverse coefficient threshold. If so, the constant inverse coefficient β in the demodulated signal is eliminated by using the IQ calibration function; otherwise, demodulation is complete. The specific value of this inverse coefficient threshold can be flexibly set according to requirements.

[0066] In the communication method shown in this embodiment, after identifying the application scenario, pairing according to the identification result, and completing the synchronization of the reference frequency, it may further include sending a reference switching notification to at least one of the other reference millimeter-wave communication units when the reference switching condition is detected; and switching one of the millimeter-wave communication units receiving the reference switching notification to become a reference millimeter-wave communication unit; that is, realizing the tracking and switching of the reference frequency synchronization status in S502 above.

[0067] For ease of understanding, this embodiment will be described below using the structure of a millimeter-wave communication unit included in a specific communication system as an example. Please refer to... Figure 7 As shown, it includes a baseband unit and an RF-band unit. The baseband unit mainly includes a modem module (i.e., the modulator and demodulator are integrated into one chip), a phase-locked loop (PLL) module, and a PHY (physical interface transceiver) module. The PHY module includes an Ethernet interface (Eth Port). The RF unit mainly includes a frequency synthesized phase-locked loop (PLL) and an RF block. The RF block adopts an orthogonal IQ modulation and demodulation scheme.

[0068] based on Figure 7 The millimeter-wave communication unit shown is illustrated in the image. For a millimeter-wave communication system in a hot backup scenario, please refer to [link / reference]. Figure 8As shown, the two millimeter-wave communication units on the left side of the millimeter-wave communication system are signal transmitters, and the two millimeter-wave communication units on the right side are signal receivers. Correspondingly, the two millimeter-wave communication units on the left can also simultaneously be signal receivers, and the two millimeter-wave communication units on the right can simultaneously be signal transmitters. In the two millimeter-wave communication units on the left, the upper millimeter-wave communication unit serves as the primary millimeter-wave communication unit, and the lower millimeter-wave communication unit serves as the backup millimeter-wave communication unit. Similarly, in the two millimeter-wave communication units on the right, the upper millimeter-wave communication unit serves as the primary millimeter-wave communication unit, and the lower millimeter-wave communication unit serves as the backup millimeter-wave communication unit. In this application scenario, an Ethernet port (Eth Port) is provided between the millimeter-wave communication units at the transmitter and receiver ends as a baseband frequency reference synchronization channel for the inter-unit reference frequency; a frequency synthesis synchronization channel is provided between the baseband sub-units and radio frequency sub-units within each millimeter-wave communication unit. In this application scenario, under the hot backup scenario of the millimeter-wave communication system, the scenario identification and setting to hot backup scenario can be completed through software on the millimeter-wave communication unit, including but not limited to the main and backup millimeter-wave communication units (M / S Unit), the reference frequency synchronization setting between the main and backup millimeter-wave communication units (M / S Unit) can be completed, the radio frequency synchronization baseband frequency can be set, and if the main millimeter-wave communication unit fails in the hot backup scenario, the main backup switchover and clock switching can be performed, and alarm reporting can be completed as needed.

[0069] In 2*2 MIMO application scenarios, the first millimeter-wave communication unit and the second millimeter-wave communication unit in the communication system can also serve as both signal transmitters and signal receivers. When serving as signal receivers, they receive the first spatial signal and the second spatial signal from the signal transmitter, respectively. The demodulation methods for the received first spatial signal and the second spatial signal are similar to those described above and will not be repeated here.

[0070] based on Figure 7 The millimeter-wave communication unit shown is illustrated in the image. For a millimeter-wave communication system in a cross-polarization cancellation scenario, please refer to [link / reference]. Figure 9As shown, the two millimeter-wave communication units on the left side of the millimeter-wave communication system are signal transmitters, and the two millimeter-wave communication units on the right side are signal receivers. Correspondingly, the two millimeter-wave communication units on the left can also simultaneously be signal receivers, and the two millimeter-wave communication units on the right can simultaneously be signal transmitters. The two millimeter-wave communication units on the left serve as a horizontal millimeter-wave communication unit and a vertical millimeter-wave communication unit, respectively; the two millimeter-wave communication units on the right serve as a horizontal millimeter-wave communication unit and a vertical millimeter-wave communication unit, respectively. In this application scenario, an Ethernet port is provided between the millimeter-wave communication units at the transmitter and receiver ends as a baseband frequency reference synchronization channel for the inter-unit reference frequency; a frequency synthesis synchronization channel is provided between the baseband sub-units and RF sub-units within the millimeter-wave communication units. In this application scenario, under cross-polarization cancellation, the millimeter-wave communication system can complete scene identification and set it as a hot backup scenario through software on the millimeter-wave communication units, complete the reference frequency synchronization setting between the horizontal / vertical millimeter-wave communication units (H / V Units), set the RF synchronization baseband frequency, perform clock switching if a clock failure occurs in the cross-polarization cancellation scenario, and finally complete alarm reporting.

[0071] In 4x4 MIMOx applications, the first and second dual-transmit / dual-receive millimeter-wave communication units in the communication system can simultaneously function as signal transmitters and receivers. In this application scenario, "dual-transmit / dual-receive" means that a single millimeter-wave communication unit can simultaneously transmit two antenna signals when acting as a transmitter and simultaneously receive two signals when acting as a receiver. The two signals transmitted by a single dual-transmit / dual-receive millimeter-wave communication unit can be two signals with cross-polarization cancellation or two spatial signals without this relationship. At the underlying hardware implementation level, a dual-transmit / dual-receive millimeter-wave communication unit can be implemented by, but is not limited to, setting up two RF transceiver modules sharing a modem with dual-transmit / dual-receive functionality. In this application scenario, because the modem in the dual-transmit / dual-receive millimeter-wave communication unit supports dual-transmit / dual-receive, the cancellation signal within the dual-transmit / dual-receive millimeter-wave communication unit can be directly transmitted within the modem. The cancellation signal between dual-transmit / dual-receive millimeter-wave communication units can be transmitted as analog signals via frequency division multiplexing, or the cancellation signal between dual-transmit / dual-receive millimeter-wave communication units can be transmitted via high-speed digital signal multiplexing. There is no reverse leakage between the two transmitted signals within the dual-transmit and dual-receive millimeter-wave communication unit. However, there is still reverse leakage between the dual-transmit and dual-receive millimeter-wave communication units. Therefore, for the reverse leakage that still exists between the dual-transmit and dual-receive millimeter-wave communication units, the millimeter-wave signal received by the receiving end can be demodulated using the same reference frequency method as shown in this embodiment. This eliminates the frequency difference intermodulation caused by the reverse leakage of the modulator chip, avoids the situation where the received millimeter-wave signal cannot be properly demodulated due to frequency difference intermodulation, and thus improves the signal frequency stability. The specific demodulation method is similar to that described above and will not be repeated here.

[0072] As can be seen, in this embodiment, compared to the superheterodyne scheme, the millimeter-wave communication unit uses an orthogonal IQ modulation and demodulation scheme to directly up-convert the baseband signal. Furthermore, addressing the issue of frequency cross-modulation caused by reverse leakage in millimeter-wave hot backup and cross-polarization cancellation scenarios, which prevents signal demodulation and leads to decreased receiving sensitivity, this embodiment uses the same reference frequency for paired millimeter-wave communication units to demodulate the received millimeter-wave signal to eliminate frequency cross-modulation. Optionally, it combines the IQ calibration function of the modulator to eliminate the constant reverse leakage coefficient β doped in the obtained baseband signal. This not only avoids the inability to correctly demodulate the received millimeter-wave signal due to frequency cross-modulation but also improves signal frequency stability and enhances receiving signal sensitivity.

[0073] This embodiment also provides a computer-readable storage medium storing a computer program that can be executed by a processor to implement at least one step of the communication method described above.

[0074] The computer-readable storage medium in this embodiment includes volatile or non-volatile, removable or non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, computer program modules or other data). Computer-readable storage media include, but are not limited to, RAM (Random Access Memory), ROM (Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), flash memory or other memory technologies, CD-ROM (Compact Disc Read-Only Memory), DVD or other optical disc storage, cartridges, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible by a computer.

[0075] This embodiment also provides a computer program (or computer software) that can be distributed on a computer-readable medium and executed by a computable device (e.g., including but not limited to the millimeter-wave communication unit described above) to implement at least one step in the communication method described above; and in some cases, at least one step shown or described can be executed in a different order than that described in the above embodiments.

[0076] This embodiment also provides a computer program product, including a computer-readable device on which any of the computer programs shown above are stored. In this embodiment, the computer-readable device may include the computer-readable storage medium shown above.

[0077] Therefore, those skilled in the art should understand that all or some of the steps, systems, and devices disclosed above, as well as the functional modules / units, can be implemented as software (which can be implemented using computer program code executable by a computing device), firmware, hardware, and suitable combinations thereof. In hardware implementations, the division between functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed collaboratively by several physical components. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as integrated circuits, such as application-specific integrated circuits (ASICs).

[0078] Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, computer program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium. Therefore, this invention is not limited to any particular combination of hardware and software.

[0079] The above description, in conjunction with specific implementation methods, provides a further detailed explanation of the embodiments of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A communication system, characterized by The communication system comprises at least two millimeter wave communication units, each of the millimeter wave communication units comprises a radio frequency module, one of the millimeter wave communication units is a reference millimeter wave communication unit; A frequency synchronization channel is established between the reference millimeter wave communication unit and each of the other millimeter wave communication units, and the reference frequency is transmitted to each of the other millimeter wave communication units through the frequency synchronization channel; Each of the millimeter wave communication units demodulates the received millimeter wave signal through the corresponding radio frequency module based on the reference frequency.

2. The communication system of claim 1, wherein, When detecting a reference switching condition trigger, the reference millimeter wave communication unit sends a reference switching notification to at least one of the other reference millimeter wave communication units; One of the millimeter wave communication units receiving the reference switching notification switches to a reference millimeter wave communication unit.

3. The communication system of claim 2, wherein, The reference switching condition comprises a reference millimeter wave communication unit failure.

4. The communication system of any one of claims 1-3, wherein, One of the millimeter wave communication units in the communication system is a master millimeter wave communication unit in a hot backup application scenario, and the other millimeter wave communication units are standby millimeter wave communication units in the hot backup application scenario, and the reference millimeter wave communication unit is the master millimeter wave communication unit; Or, The millimeter wave communication units in the communication system are horizontal millimeter wave communication units and vertical millimeter wave communication units in a cross-polarization cancellation application scenario, and the reference millimeter wave communication unit is the horizontal millimeter wave communication unit or the vertical millimeter wave communication unit; Or, The communication system comprises two millimeter wave communication units, one of the millimeter wave communication units is a first millimeter wave communication unit in a 2*2 MIMO application scenario, and the other millimeter wave communication unit is a second millimeter wave communication unit in the 2*2 MIMO application scenario, and the reference millimeter wave communication unit is the first millimeter wave communication unit or the second millimeter wave communication unit; Or, The communication system comprises two millimeter wave communication units, one of the millimeter wave communication units is a first dual-transmit dual-receive millimeter wave communication unit in a 4*4 MIMO application scenario, and the other millimeter wave communication unit is a second dual-transmit dual-receive millimeter wave communication unit in the 4*4 MIMO application scenario, and the reference millimeter wave communication unit is the first dual-transmit dual-receive millimeter wave communication unit or the second dual-transmit dual-receive millimeter wave communication unit.

5. The communication system of any of claims 1-3, wherein, Each of the millimeter wave communication units comprises a baseband subunit and a radio frequency subunit, the baseband subunit comprises a modem module, a phase-locked loop module, and a physical interface transceiver module, and the radio frequency subunit comprises a frequency synthesizer phase-locked loop module and the radio frequency module; The frequency synchronization channel comprises a baseband frequency reference synchronization channel between the millimeter wave communication units, and a frequency synthesizer synchronization channel for baseband frequency synchronization between the baseband subunit and the radio frequency subunit inside the millimeter wave communication unit; The baseband frequency reference synchronization channel is composed of a channel established between the phase-locked loop module of the reference millimeter wave communication unit and the phase-locked loop module of each of the other millimeter wave communication units through the physical interface transceiver module; The frequency synthesizer synchronization channel is composed of a channel between the phase-locked loop module, the frequency synthesizer phase-locked loop module, and the radio frequency module inside the millimeter wave communication unit.

6. The communication system of claim 5 wherein, The physical interface transceiver module comprises an Ethernet port, a baseband frequency reference synchronization channel between the millimeter wave communication units, and a channel established between the phase-locked loop modules of the reference millimeter wave communication unit and the phase-locked loop modules of other millimeter wave communication units through the Ethernet port by the phase-locked loop module of the reference millimeter wave communication unit.

7. The communication system of any one of claims 1-3, wherein, Each of the millimeter wave communication units comprises a baseband subunit and a radio frequency subunit, and the radio frequency subunit comprises a frequency synthesizer phase-locked loop module and the radio frequency module; The frequency synchronization channel comprises a radio frequency frequency reference synchronization channel between the millimeter wave communication units; The radio frequency frequency reference synchronization channel between the millimeter wave communication units comprises a channel established between the frequency synthesizer phase-locked loop modules of the reference millimeter wave communication unit and the frequency synthesizer phase-locked loop modules of other millimeter wave communication units through the physical interface transceiver module.

8. A communication method applied to the communication system of any one of claims 1-7, comprising: Each of the millimeter wave communication units receives a millimeter wave signal from a signal transmitting end; Each of the millimeter wave communication units demodulates each received millimeter wave signal through the corresponding radio frequency module based on the reference frequency.

9. The communication method of claim 8, wherein, The method further comprises: When a reference switching condition trigger is detected, sending a reference switching notification to at least one of the other reference millimeter wave communication units; Switching to a reference millimeter wave communication unit by the millimeter wave communication unit receiving one of the reference switching notifications.

10. The communication method according to claim 8 or 9, characterized by, The radio frequency module demodulates the millimeter wave signal through a quadrature IQ demodulation method; The method further comprises: after the radio frequency module demodulates the millimeter wave signal through the quadrature IQ demodulation method, eliminating constant reverse coefficients in the demodulated signal as a direct current signal through an IQ calibration function.

11. A computer storage medium, characterized in that The computer storage medium stores at least one computer program, and the computer program is run by the processor to execute at least one step of the communication method of any one of claims 8-10.

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