CN113810078A - Communication system, communication method, and computer storage medium - Google Patents

Communication system, communication method, and computer storage medium Download PDF

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Publication number
CN113810078A
CN113810078A CN202010536981.7A CN202010536981A CN113810078A CN 113810078 A CN113810078 A CN 113810078A CN 202010536981 A CN202010536981 A CN 202010536981A CN 113810078 A CN113810078 A CN 113810078A
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millimeter wave
wave communication
communication unit
frequency
units
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樊鹏
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2021/096390 priority patent/WO2021249198A1/en
Publication of CN113810078A publication Critical patent/CN113810078A/en
Priority to CONC2023/0000232A priority patent/CO2023000232A2/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/401—Circuits for selecting or indicating operating mode
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
    • H04L7/033—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase

Abstract

The embodiment of the invention provides a communication system, a communication method and a computer storage medium, wherein 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 other millimeter wave communication unit, and reference frequency is transmitted to each other millimeter wave communication unit through the frequency synchronization channel; each millimeter wave communication unit demodulates the received millimeter wave signal through the corresponding radio frequency module based on the reference frequency, so that frequency difference intermodulation caused by reverse leakage is eliminated, the condition that the received millimeter wave signal cannot be correctly demodulated due to the frequency difference intermodulation is avoided, the signal frequency stability is improved, and the sensitivity of the received signal is improved.

Description

Communication system, communication method, and computer storage medium
Technical Field
The present invention relates to the field of communications, and in particular, to a communication system, a communication method, and a computer storage medium.
Background
Millimeter wave communication is an important subject of 5G technology, and is mainly applied to 5G high-capacity forward transmission/return transmission. Millimeter wave communication systems are used at higher carrier frequencies, and use higher symbol rates during the transmission process to transmit larger amounts of information.
The millimeter wave communication implementation scheme includes a superheterodyne scheme and a quadrature IQ modulation and demodulation scheme. The superheterodyne scheme requires multi-stage frequency conversion, has high circuit complexity, and has high requirements for receiving signals in the field of millimeter wave communication, particularly millimeter wave outdoor equipment, so that the design of the circuit is also complex. Under the condition that the demodulation quality is not changed, the complexity of a circuit level needs to be increased if the requirement of receiving signals is simply reduced, so that the superheterodyne scheme is not suitable for a millimeter wave communication system.
When the quadrature IQ modulation and demodulation scheme is adopted, the frequency of the millimeter wave communication system is high, so that the architecture design is simple, the transmitting end applies quadrature IQ modulation to directly up-convert a baseband signal to a millimeter wave frequency band, and the receiving end applies quadrature IQ modulation to down-convert a millimeter wave signal to the baseband. When the carrier frequency rises to the millimeter wave frequency band, the input IQ signal is directly up-converted to the millimeter wave, and the carrier signal is positioned at the center of the frequency spectrum signal. With the increase of carrier frequency, the leakage of the radio frequency module modem can cause the quality of transmission signals to be reduced, and further the receiving sensitivity of the millimeter wave communication system is influenced. For example, when the reverse leakage signal of the rf module modem is mixed with the normal signal, a frequency difference intermodulation occurs, which may result in that the received millimeter wave signal cannot be demodulated correctly.
Disclosure of Invention
The communication system, the communication method and the computer storage medium provided by the embodiment of the invention solve the problem that the received millimeter wave signal cannot be correctly demodulated due to frequency difference intermodulation.
In order to solve the above technical problem, an embodiment of the present invention provides a communication system, where the communication system includes at least two millimeter wave communication units, and each millimeter wave communication unit includes 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 reference frequency is transmitted to each of the other millimeter wave communication units through the frequency synchronization channel;
and each millimeter wave communication unit demodulates the received millimeter wave signal through a corresponding radio frequency module based on the reference frequency.
In order to solve the above technical problem, an embodiment of the present invention further provides a communication method applied to the communication system described above, including:
each millimeter wave communication unit receives a millimeter wave signal from a signal sending end;
and the millimeter wave communication units demodulate each received millimeter wave signal through a corresponding radio frequency module based on the reference frequency.
To solve the above technical problem, an embodiment of the present invention further provides a communication method computer storage medium, where at least one computer program is stored, and when the computer program is executed by a processor, at least one step of the communication method is performed.
Advantageous effects
The embodiment of the invention provides a communication system, a communication method and a computer storage medium, wherein 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 other millimeter wave communication unit, and reference frequency is transmitted to each other millimeter wave communication unit through the frequency synchronization channel; each millimeter wave communication unit demodulates the received millimeter wave signal through the corresponding radio frequency module based on the reference frequency, so that frequency difference intermodulation caused by reverse leakage of a modulator chip is eliminated, the condition that the received millimeter wave signal cannot be correctly demodulated due to the frequency difference intermodulation is avoided, the signal frequency stability is improved, and the sensitivity of the received signal is improved.
Additional features and corresponding advantages of the invention are set forth in the description which follows, and it is to be understood that at least some of the advantages will be apparent from the description of the invention.
Drawings
Fig. 1 is a schematic diagram of quadrature IQ demodulation of millimeter wave signals by a radio frequency module in the related art according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a communication system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a communication system in which a reference frequency is a baseband frequency of a reference millimeter wave communication unit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a communication system in which a reference frequency is a radio frequency of a reference millimeter wave communication unit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a communication method according to a second embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a second communication method according to a second embodiment of the present invention;
fig. 7 is a structural diagram of a millimeter wave communication unit according to a second embodiment of the present invention;
fig. 8 is a schematic diagram of a millimeter wave communication system in a hot backup scenario according to a second embodiment of the present invention;
fig. 9 is a schematic diagram of a cross-polarization cancellation scene millimeter wave communication system according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are 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.
The first embodiment is as follows:
in the related art, there is a frequency difference intermodulation caused by reverse leakage of a modulator chip in each millimeter wave communication unit serving as a receiving end, and a condition that a received millimeter wave signal cannot be correctly demodulated occurs. See, for example, β cos ω in FIG. 11t, where β is the reverse leakage coefficient of the modem, which is constant once the modem chip is produced. Reverse leakage signal beta cos omega1t is mixed with the normal signal s (t), thereby generating frequency-difference intermodulation. For example, in fig. 1, the IQ modulator at the transmitting end up-converts a and b and outputs the resultSignal s (t) ═ acos ω0t-bsinω0t; at the receiving end of the communication system, since reverse leakage is doped into the s (t) signal, taking the I1 signal obtained by demodulating the I signal (where the demodulation processes of the Q1 path, the I2 path, and the Q2 path are similar and are not described herein again) as an example, the demodulation process is as follows (1):
Figure BDA0002537411270000031
wherein the beta cos omega1t is reverse leakage of the local oscillation signal; omega1＝ω0+Δω；
Figure RE-GDA0002655195310000032
It can be seen that:
when the reverse leakage coefficient beta is very small
Figure BDA0002537411270000034
Thus I1A; but the reverse leakage coefficients of all factory chips are difficult to control to meet the technical requirements based on the prior art;
(ii) when the reverse leakage coefficient β is large, and Δ ω is 0, I1If the frequencies of the communication units are synchronized, only a constant reverse leakage coefficient beta is doped in the baseband signal, and the reverse leakage coefficient beta can be eliminated as a direct current signal through an internal IQ calibration function of the modem, so that the signal is normally demodulated, and the sensitivity of the received signal is improved;
Figure BDA0002537411270000035
(III) when the reverse leakage coefficient beta is larger and delta omega is not equal to 0,
Figure BDA0002537411270000036
at this time, the millimeter wave signal received by the third millimeter wave system cannot be demodulated correctly because the baseband signal is doped with the millimeter wave signal due to the frequency differenceIntermodulation interference, i.e., frequency-difference intermodulation, is generated. Therefore, how to avoid generating frequency difference intermodulation and further causing that the received millimeter wave signal cannot be correctly demodulated is a technical problem which is urgently needed to be solved at present.
The communication system of this embodiment includes at least two millimeter wave communication units that can implement synchronization of reference frequency, and each millimeter wave communication unit demodulates the received millimeter wave signal based on the reference frequency, thereby eliminating frequency difference intermodulation (i.e., reverse leakage and signal inter-modulation) caused by reverse leakage of the modulator chip, further improving signal frequency stability, and improving received signal sensitivity (i.e., the lowest signal strength that can be received by the receiver and can normally operate).
In an application example, the communication system provided in the present embodiment is shown in fig. 2, and includes at least two millimeter wave communication units, and each millimeter wave communication unit includes a radio frequency module; of course, in some application examples, the at least two millimeter wave communication units may also serve as a signal sending end, and in this case, the radio frequency module may be further configured to modulate and send a millimeter wave signal in addition to receiving the millimeter wave signal. It should be understood that the signal demodulation module and the signal demodulation module of the millimeter wave communication unit in this embodiment may be implemented by being integrated in one circuit or chip, or may be two independent modules.
In addition, it should be understood that the number of millimeter wave communication units included in the communication system in the present embodiment may be flexibly set according to specific requirements. For example, in an application scenario, the communication system may include two millimeter wave communication units, where the two millimeter wave communication units are paired communication units; in another application scenario, the communication system may also include three or more millimeter wave communication units. And it should be understood that the relationship between the millimeter wave communication units can be flexibly set according to specific application scenarios. For example, when the current application scenario is a hot backup application scenario, one of the millimeter wave communication units in the communication system is a main millimeter wave communication unit in the hot backup application scenario, and the other communication units are standby millimeter wave communication units in the hot backup application scenario. When the current application scene is a cross polarization cancellation application scene, the millimeter wave communication units in the communication system can be a horizontal millimeter wave communication unit and a vertical millimeter wave communication unit in the cross polarization cancellation application scene, respectively, and the reference millimeter wave communication unit is a horizontal millimeter wave communication unit or a vertical millimeter wave communication unit. When the current application scenario is a 2 × 2MIMO application scenario, one of the two millimeter wave communication units included in the communication system is a first millimeter wave communication unit in the 2 × 2MIMO application scenario, the other millimeter wave communication unit is a second millimeter wave communication unit in the 2 × 2MIMO application scenario, and the reference millimeter wave communication unit may be the first millimeter wave communication unit or the second millimeter wave communication unit. For another example, when the current application scenario is a 4 × 4MIMO application scenario, one of the two millimeter wave communication units included in the communication system is a first dual-transmission and dual-reception millimeter wave communication unit in the 4 × 4MIMO application scenario, the other millimeter wave communication unit is a second dual-transmission and dual-reception millimeter wave communication unit in the 4 × 4MIMO application scenario, and the reference millimeter wave communication unit may be the first dual-transmission and dual-reception millimeter wave communication unit or the second dual-transmission and dual-reception millimeter wave communication unit.
In this embodiment, one of the millimeter wave communication units included in the communication system is a reference millimeter wave communication unit, a frequency synchronization channel is established between the reference millimeter wave communication unit and each other millimeter wave communication unit, and a reference frequency is transmitted to each other millimeter wave communication unit through the frequency synchronization channel, so as to complete 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 a millimeter wave frequency band, each millimeter wave communication unit can demodulate the received millimeter wave signal through a corresponding radio frequency module (i.e. of each millimeter wave communication unit itself) based on the reference frequency, so as to eliminate a frequency difference between the millimeter wave communication units, i.e. eliminate frequency difference intermodulation caused by reverse leakage of a modulator chip in each millimeter wave communication unit serving as a receiving end, the condition that the received millimeter wave signals cannot be correctly demodulated due to frequency difference intermodulation is avoided.
In this embodiment, the reference frequency may be a reference frequency injected from outside the communication system to the reference millimeter wave communication unit; but also a frequency generated by the reference millimeter wave communication unit itself, such as but not limited to a baseband frequency or a radio frequency of the reference millimeter wave communication unit. For the convenience of understanding, the present embodiment will be described below by taking a baseband frequency and a radio frequency of the millimeter wave communication unit as an example with reference to a reference frequency, respectively.
Referring to fig. 3, each millimeter-wave communication unit of the communication system includes a baseband sub-unit and a radio frequency sub-unit, in this example, the upper millimeter-wave communication unit (which may be, of course, the lower millimeter-wave communication unit) in fig. 3 is the reference millimeter-wave communication unit; the baseband subunit comprises a phase-locked loop module, a physical interface transceiver module and a modulation and demodulation module, and the radio frequency subunit comprises a radio frequency module and a frequency synthesis phase-locked loop module; the frequency synchronization channel comprises a baseband frequency reference synchronization channel between the millimeter wave communication units and a frequency synthesis synchronization channel for performing baseband frequency synchronization between a baseband subunit and a radio frequency subunit inside the millimeter wave communication units, wherein:
a baseband frequency reference synchronization channel between the millimeter wave communication units is formed by a channel established between a phase-locked loop module of the reference millimeter wave communication unit in fig. 3 and phase-locked loop modules of other millimeter wave communication units through a physical interface transceiver module;
the frequency synthesis synchronization channel for performing baseband frequency synchronization between the baseband subunit and the radio frequency subunit inside the millimeter wave communication unit is composed of a phase-locked loop module inside the millimeter wave communication unit in fig. 3, a channel between the frequency synthesis phase-locked loop module and the radio frequency module.
The physical interface transceiver module in this embodiment may include an ethernet port, and a baseband frequency reference synchronization channel between the millimeter wave communication units, and may be composed of channels established between a phase-locked loop module of the reference millimeter wave communication unit and phase-locked loop modules of other millimeter wave communication units through the ethernet port; the millimeter wave communication unit is directly connected with an Ethernet Port (Eth Port) which is originally arranged by the millimeter wave communication unit to form a baseband frequency reference synchronous channel, structural transformation of the millimeter wave communication unit is not needed, and the millimeter wave communication unit is small in modification, easy to realize, low in cost and good in universality; of course, in other application scenarios, a new interface may also be arranged on the millimeter wave communication unit to implement 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.
Referring to fig. 4, an example of a reference frequency being a radio frequency of a reference millimeter wave communication unit is shown, in this example, an upper millimeter wave communication unit (which may be a lower millimeter wave communication unit, of course) in fig. 4 is the reference millimeter wave communication unit; in the present application example, the frequency synchronization channel includes a radio frequency reference synchronization channel between the millimeter wave communication units; the video frequency reference synchronization channel between the millimeter wave communication units is composed of channels established between the frequency synthesis phase-locked loop module of the reference millimeter wave communication unit and the frequency synthesis phase-locked loop modules of other millimeter wave communication units through the physical interface transceiver module. In some application scenarios, a new interface may be provided on the millimeter wave communication unit or an interface that is originally provided by the millimeter wave communication unit and satisfies communication performance may be used to implement communication connection 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.
It should be understood that, in each millimeter wave communication unit of the communication system of the present embodiment, which millimeter wave communication unit is specifically selected may be flexibly set according to a specific application scenario. For example, when one of the millimeter wave communication units in the communication system is a main millimeter wave communication unit in a hot standby application scenario, and the other communication units are standby millimeter wave communication units in the hot standby application scenario, the reference millimeter wave communication unit may be set as the main millimeter wave communication unit (of course, the reference millimeter wave communication unit may also be set as one of the standby millimeter wave communication units according to the requirement).
For another example, when the millimeter wave communication unit in the communication system is a horizontal millimeter wave communication unit and a vertical millimeter wave communication unit in the cross polarization cancellation application scenario, the reference millimeter wave communication unit may be the horizontal millimeter wave communication unit in the communication system, and may also be the vertical millimeter wave communication unit in the communication system.
Optionally, in order to improve reliability and practicability of the communication system, frequency synchronization channels are established between the reference millimeter wave communication unit and the reference millimeter wave communication unit in the set communication system and other millimeter wave communication units, so as to achieve frequency synchronization between the millimeter wave communication units; the reference millimeter wave communication unit can also detect and track the frequency synchronization condition, and when the triggering of the reference switching condition is detected, the reference switching notification is sent to at least one of other reference millimeter wave communication units; thereby causing one of the millimeter wave communication units that received the reference switching notification to switch to the reference millimeter wave communication unit. It should be understood that:
the reference switching notification may be sent through, but not limited to, the frequency synchronization channel, or may be sent through another communication channel between the reference millimeter wave communication unit and another millimeter wave communication unit;
the reference switching condition may include, but is not limited to: the reference millimeter wave communication unit malfunctions.
For ease of understanding, the present embodiment is still described below in several application scenarios of the above examples.
In a hot backup scenario of the millimeter wave communication system, after scene recognition is completed and a hot backup scenario is set, reference frequency synchronization setting between a main Unit and a standby Unit (M/S Unit, that is, a main millimeter wave communication Unit and a standby millimeter wave communication Unit) is completed in the above manner, for example, the main millimeter wave communication Unit is set as a reference millimeter wave communication Unit, and a radio frequency synchronization baseband frequency of the millimeter wave communication Unit is set as a reference. In the application scenario, in a hot backup scenario, if a main millimeter wave communication unit fails, main/standby switching and clock switching are performed, and the millimeter wave communication unit switched to a new main millimeter wave communication unit is used as a new reference millimeter wave communication unit; and alarm reporting can be completed according to the application scene requirements.
In a millimeter wave communication cross polarization cancellation scene, completing scene identification and setting as a cross polarization cancellation scene, and completing reference frequency synchronization setting between horizontal/vertical units (H/V units, that is, horizontal millimeter wave communication units and vertical millimeter wave communication units) according to the above manner, for example, setting a main millimeter wave communication Unit as a reference millimeter wave communication Unit, and setting a radio frequency synchronization baseband frequency of the horizontal millimeter wave communication Unit as a reference, that is, setting a radio frequency synchronization baseband reference, and in this scene, if a clock of the horizontal millimeter wave communication Unit fails, performing clock switching, and using the vertical millimeter wave communication Unit as a new reference millimeter wave communication Unit; and alarm reporting can be completed according to the application scene requirements.
In a 2 × 2MIMO application scenario, the reference frequency synchronization setting between the first millimeter wave communication unit and the second millimeter wave communication unit is completed in the above manner, for example, the first millimeter wave communication unit is initially set as the reference millimeter wave communication unit, and the radio frequency synchronization baseband frequency of the millimeter wave communication unit is set as the reference. In the application scenario, if the first millimeter wave communication unit is detected to have a fault and switched, the second millimeter wave communication unit is switched to serve as a new reference millimeter wave communication unit, and alarm reporting can be completed according to the requirements of the application scenario.
In the 4 × 4mimo application scenario, the reference frequency synchronization setting between the first dual-transmission and dual-reception millimeter wave communication unit and the second dual-transmission and dual-reception millimeter wave communication unit is completed in the above manner, for example, the second dual-transmission and dual-reception millimeter wave communication unit is initially set as the reference millimeter wave communication unit, and the radio frequency synchronization baseband frequency of the millimeter wave communication unit is set as the reference. In the application scenario, if the second dual-transmitting and dual-receiving millimeter wave communication unit is detected to have a fault and switched, the first dual-transmitting and dual-receiving millimeter wave communication unit is switched to serve as a new reference millimeter wave communication unit, and alarm reporting can be completed according to the application scenario requirements.
That is, in this embodiment, the reference millimeter wave communication unit providing the reference frequency may be dynamically switched, so that under the scenarios of hot backup protection and cross polarization cancellation of millimeter wave communication, the reference frequency is used as the reference synchronization to solve the frequency difference cross modulation interference, eliminate the frequency difference cross modulation caused by reverse leakage, improve the signal frequency stability, and improve the sensitivity of receiving signals.
Example two:
for convenience of understanding, the present embodiment will be described below by taking a communication method of the communication system as an example based on the communication system architecture shown in the above embodiment. Referring to fig. 5, the process includes:
s501: and identifying the application scene, pairing according to the identification result, and completing the synchronization of the reference frequency.
For example, identifying a hot backup application scene, a cross polarization cancellation application scene, 2 x 2MIMO or 4 x 4MIMO of the millimeter wave communication system, and then performing corresponding pairing of millimeter wave communication units in the communication system according to the identification result; synchronization of the reference frequency is then accomplished in the manner described above.
S502: and tracking and switching the reference frequency synchronization condition.
The clock tracking and switching between the main and standby (M/S) units, the horizontal and vertical (H/V) units, the first and second millimeter wave communication units, or the first and second dual-transmission and dual-reception millimeter wave communication units is performed, for example, in the above-described exemplary manner.
S503: and the radio frequency module of the millimeter wave communication unit completes the direct current calibration of the baseband IQ signal.
Fig. 6 shows a process of receiving and demodulating a signal, which includes:
s601: each millimeter wave communication unit receives a millimeter wave signal from the signal transmitting end.
S602: each millimeter wave communication unit demodulates each received millimeter wave signal through a radio frequency module based on the reference frequency; the millimeter wave signal may be demodulated by, but not limited to, quadrature IQ demodulation.
And optionally, after the radio frequency module demodulates the millimeter wave signal in an orthogonal IQ demodulation mode, the constant inverse coefficient β in the demodulated signal can be eliminated as a direct current signal by an IQ calibration function. For example, in some application examples, after the radio frequency module demodulates the millimeter wave signal in the quadrature IQ demodulation manner, the constant inverse coefficient β in the demodulated signal may be directly eliminated as a direct current signal by the IQ calibration function; or judging whether the constant inverse coefficient beta is larger than a set inverse coefficient threshold value or not, if so, eliminating the constant inverse coefficient beta in the demodulated signal which is equivalent to a direct current signal through an IQ calibration function; if not, the demodulation is completed. The specific value of the reverse coefficient threshold can be flexibly set according to requirements.
In the communication method shown in this embodiment, after identifying an application scenario, performing pairing according to an identification result, and completing synchronization of reference frequencies, the method may further specifically include sending a reference switching notification to at least one of other reference millimeter wave communication units when a trigger of a reference switching condition is detected; one millimeter wave communication unit in the received reference switching notification is switched to be the reference millimeter wave communication unit; that is, the tracking and switching of the reference frequency synchronization condition in S502 described above are realized.
For ease of understanding, the present embodiment will be described below by taking the structure of a millimeter wave communication unit included in a specific communication system as an example. Please refer to fig. 7, which includes a Base-band Unit (Base-band Unit) and a radio frequency Unit (RF-band Unit). The baseband sub-unit mainly includes a Modem (i.e., a modulator and a demodulator are integrated in one chip), a phase-locked loop module (PLL), and a PHY (physical interface transceiver) module, where the PHY module includes an ethernet interface Eth Port. The radio frequency subunit mainly comprises a frequency synthesis phase-locked loop (PLL) and a radio frequency module (RF Block), and the radio frequency module adopts an orthogonal IQ modulation and demodulation scheme.
Based on the millimeter wave communication units shown in fig. 7, please refer to fig. 8 for a millimeter wave communication system in a hot backup scenario, where two millimeter wave communication units on the left side of the millimeter wave communication system are signal sending terminals, and two millimeter wave communication units on the right side are signal receiving terminals; correspondingly, the two millimeter wave communication units on the left side can also be used as signal receiving ends, and the two millimeter wave communication units on the right side can be used as signal sending ends. The upper millimeter wave communication unit of the two millimeter wave communication units on the left side is used as a main millimeter wave communication unit, and the lower millimeter wave communication unit is used as a standby millimeter wave communication unit; the upper millimeter wave communication unit of the two millimeter wave communication units on the right serves as a main millimeter wave communication unit, and the lower millimeter wave communication unit serves as a standby millimeter wave communication unit. In the application scenario, an Ethernet Port (Eth Port) is provided between millimeter wave communication units of a sending end and a receiving end as a baseband frequency reference synchronization channel of reference frequency between units; and a frequency synthesis synchronous channel is provided between the baseband subunit and the radio frequency subunit in the millimeter wave communication unit. In the application scenario, in a hot backup scenario of the millimeter wave communication system, scene recognition can be completed through software on the millimeter wave communication Unit, the scene recognition is set as the hot backup scenario, the reference frequency synchronization setting between the main millimeter wave communication Unit and the standby millimeter wave communication Unit (M/S Unit) is completed, the radio frequency synchronization baseband frequency is set, the main/standby switching and the clock switching are performed in the hot backup scenario if the main millimeter wave communication Unit fails, and alarm reporting can be completed according to requirements.
For a 2 x 2MIMO application scenario, a first millimeter wave communication unit and a second millimeter wave communication unit in a communication system can also be used as a signal sending end and a signal receiving end at the same time; when the first spatial signal and the second spatial signal are received from the signal transmitting end respectively as the signal receiving end, the demodulation mode of the received first spatial signal and the received second spatial signal is similar to that described above, and details are not repeated here.
Based on the millimeter wave communication units shown in fig. 7, please refer to fig. 9 for a millimeter wave communication system with a cross polarization cancellation scenario, where two millimeter wave communication units on the left side of the millimeter wave communication system are signal sending terminals, and two millimeter wave communication units on the right side are signal receiving terminals; correspondingly, the two millimeter wave communication units on the left side can also be used as signal receiving ends, and the two millimeter wave communication units on the right side can be used as signal sending ends. The two millimeter wave communication units on the left side are respectively used as a horizontal millimeter wave communication unit and a vertical millimeter wave communication unit; and the two millimeter wave communication units on the right side are respectively used as a horizontal millimeter wave communication unit and a vertical millimeter wave communication unit. In the application scenario, an Ethernet Port (Eth Port) is provided between millimeter wave communication units of a sending end and a receiving end as a baseband frequency reference synchronous channel of reference frequency between units; and a frequency synthesis synchronous channel is provided between the baseband subunit and the radio frequency subunit in the millimeter wave communication unit. In the application scenario, in the cross polarization cancellation scenario of the millimeter wave communication system, scene recognition can be completed through software on the millimeter wave communication Unit without limitation, the scene recognition is set as a hot backup scenario, the reference frequency synchronization setting between horizontal/vertical millimeter wave communication units (H/V units) is completed, the radio frequency synchronization baseband frequency is set, and in the cross polarization cancellation scenario, if a clock fails, clock switching is performed, and finally alarm reporting is completed.
For the 4 x 4MIMOx application scenario, the first dual-transmitting and dual-receiving millimeter wave communication unit and the second dual-transmitting and dual-receiving millimeter wave communication unit in the communication system can also be used as a signal transmitting end and a signal receiving end at the same time, the dual-transmitting and dual-receiving in the application scenario means that one millimeter wave communication unit can simultaneously transmit two antenna signals when being used as the signal transmitting end, and can simultaneously receive two signals when being used as the signal receiving end, and the two signals transmitted by one dual-transmitting and dual-receiving millimeter wave communication unit can be two signals with cross polarization cancellation relation, and can also be two spatial signals without the relation; in the implementation of bottom layer hardware, a dual-transmitting and dual-receiving millimeter wave communication unit can be implemented by, but not limited to, setting two radio frequency transceiver modules to share one modem module with dual-transmitting and dual-receiving functions. In this application scenario, because the modem in the dual-transmitting and dual-receiving millimeter wave communication unit supports dual-transmitting and dual-receiving, the cancellation signal inside the dual-transmitting and dual-receiving millimeter wave communication unit can be directly transmitted inside the modem, the cancellation signal between the dual-transmitting and dual-receiving millimeter wave communication units can be transmitted according to the analog signal by frequency division multiplexing the two cancellation signals, or the cancellation signal between the dual-transmitting and dual-receiving millimeter wave communication units can be transmitted by high-speed digital signal multiplexing. The reverse leakage does not exist between the double-transmitting signals inside the double-transmitting and double-receiving millimeter wave communication unit, but the reverse leakage still exists between the double-transmitting and double-receiving millimeter wave communication units, so that the millimeter wave signals received by the receiving end can be demodulated by adopting the mode based on the same reference frequency shown in the embodiment for the reverse leakage still existing between the double-transmitting and double-receiving millimeter wave communication units, so that the frequency difference intermodulation caused by the reverse leakage of the modulator chip is eliminated, the situation that the received millimeter wave signals cannot be correctly demodulated due to the frequency difference intermodulation is avoided, the signal frequency stability is further improved, the specific demodulation mode is similar to the above mode, and the description is not repeated.
As can be seen, in the present embodiment, the millimeter wave communication unit performs direct up-down conversion of the baseband signal using the quadrature IQ modulation and demodulation scheme, as opposed to the superheterodyne scheme. And aiming at the problem that the signal cannot be demodulated due to frequency difference intermodulation caused by reverse leakage under the scenes of millimeter wave hot backup and cross polarization cancellation, the embodiment demodulates the received millimeter wave signal by adopting the same reference frequency for the paired millimeter wave communication units so as to eliminate the frequency difference intermodulation, and optionally eliminates a constant reverse leakage coefficient beta doped in the obtained baseband signal by combining the IQ calibration function of the modulation regulator, thereby not only avoiding the occurrence of the situation that the received millimeter wave signal cannot be correctly demodulated due to the frequency difference intermodulation, but also improving the signal frequency stability and improving the sensitivity of the received signal.
The present embodiment also provides a computer-readable storage medium storing a computer program executable by a processor to implement at least one step of the communication method as described above.
The computer-readable storage media in this embodiment include volatile or nonvolatile, removable or non-removable media implemented in any method or technology for storage of 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 technology, CD-ROM (Compact disk Read-Only Memory), Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer.
The present embodiment also provides a computer program (or computer software), which can be distributed on a computer-readable medium and executed by a computing device (for example, including but not limited to the millimeter wave communication unit) to implement at least one step of the communication method described above; and in some cases at least one of the steps shown or described may be performed in an order different than that described in the embodiments above.
The present embodiments also provide a computer program product comprising a computer readable means having stored thereon any of the computer programs as set out above. The computer readable means in this embodiment may comprise a computer readable storage medium as shown above.
It will be apparent to those skilled in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software (which may be implemented in computer program code executable by a computing device), firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to a division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit.
In addition, communication media typically embodies computer readable instructions, data structures, computer program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to one of ordinary skill in the art. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is a more detailed description of the embodiments of the present invention with reference to specific embodiments, and it should not be construed that the embodiments of the present invention are limited to these descriptions. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (11)

1. A communication system is characterized in that the communication system comprises at least two millimeter wave communication units, each millimeter wave communication unit comprises a radio frequency module, and 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 reference frequency is transmitted to each of the other millimeter wave communication units through the frequency synchronization channel;
and each millimeter wave communication unit demodulates the received millimeter wave signal through a corresponding radio frequency module based on the reference frequency.
2. The communication system according to claim 1, wherein the reference millimeter wave communication unit transmits a reference switching notification to at least one of the other reference millimeter wave communication units when a reference switching condition trigger is detected;
and receiving one of the millimeter wave communication units in the reference switching notification to switch to the reference millimeter wave communication unit.
3. The communication system of claim 2, wherein the reference handover condition comprises: the reference millimeter wave communication unit malfunctions.
4. The communication system according to any one of claims 1 to 3, wherein one of the millimeter wave communication units in the communication system is a main millimeter wave communication unit in a hot standby application scenario, the other millimeter wave communication units are standby millimeter wave communication units in the hot standby application scenario, and the reference millimeter wave communication unit is the main millimeter wave communication unit;
or the like, or, alternatively,
the millimeter wave communication units in the communication system are respectively a horizontal millimeter wave communication unit and a vertical millimeter wave communication unit under a cross polarization cancellation application scene, and the reference millimeter wave communication unit is the horizontal millimeter wave communication unit or the vertical millimeter wave communication unit;
or the like, or, alternatively,
the communication system comprises two millimeter wave communication units, wherein one millimeter wave communication unit is a first millimeter wave communication unit in a 2 x 2MIMO application scene, the other millimeter wave communication unit is a second millimeter wave communication unit in the 2 x 2MIMO application scene, and the reference millimeter wave communication unit is the first millimeter wave communication unit or the second millimeter wave communication unit;
or the like, or, alternatively,
the communication system comprises two millimeter wave communication units, wherein one millimeter wave communication unit is a first dual-transmitting and dual-receiving millimeter wave communication unit in a 4 x 4MIMOx application scene, the other millimeter wave communication unit is a second dual-transmitting and dual-receiving millimeter wave communication unit in the 4 x 4MIMOx application scene, and the reference millimeter wave communication unit is the first dual-transmitting and dual-receiving millimeter wave communication unit or the second dual-transmitting and dual-receiving 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 comprising a modem module, a phase-locked loop module, a physical interface transceiver module, the radio frequency subunit comprising a frequency synthesizer phase-locked loop module and the radio frequency module;
the frequency synchronization channel includes: a baseband frequency reference synchronization channel between the millimeter wave communication units, and a frequency synthesis synchronization channel for performing baseband frequency synchronization between a baseband subunit and a radio frequency subunit inside the millimeter wave communication units;
the baseband frequency reference synchronization channel is composed of channels 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 a physical interface transceiver module;
the frequency synthesis synchronous channel is composed of a phase-locked loop module inside the millimeter wave communication unit, a channel between the frequency synthesis phase-locked loop module and the radio frequency module.
6. The communication system of claim 5, wherein said physical interface transceiver module comprises an ethernet port, and a baseband frequency reference synchronization channel between said millimeter wave communication units is comprised of channels established between a phase locked loop module of said reference millimeter wave communication unit and phase locked loop modules of other said millimeter wave communication units through said ethernet port.
7. The communication system of any of claims 1-3, wherein each of the millimeter wave communication units comprises a baseband sub-unit and a radio frequency sub-unit, the radio frequency sub-unit comprising a frequency synthesizer phase-locked loop module and the radio frequency module;
the frequency synchronization channel comprises a radio frequency reference synchronization channel between the millimeter wave communication units;
and the radio frequency reference synchronous channel between the millimeter wave communication units is formed by channels established between the frequency synthesis phase-locked loop module of the reference millimeter wave communication unit and the frequency synthesis phase-locked loop modules of other millimeter wave communication units through a physical interface transceiver module.
8. A communication method applied to the communication system according to any one of claims 1 to 7, comprising:
each millimeter wave communication unit receives a millimeter wave signal from a signal sending end;
and the millimeter wave communication units demodulate each received millimeter wave signal through a corresponding radio frequency module based on the reference frequency.
9. The communication method of claim 8, wherein the method further comprises:
when the trigger of the reference switching condition is detected, sending a reference switching notice to at least one of the other reference millimeter wave communication units;
and receiving one of the millimeter wave communication units in the reference switching notification to switch to the reference millimeter wave communication unit.
10. The communication method according to claim 8 or 9, wherein the radio frequency module demodulates the millimeter wave signal by a quadrature IQ demodulation method;
the method further comprises the following steps: after the radio frequency module demodulates the millimeter wave signal in an orthogonal IQ demodulation mode, a constant inverse coefficient in the demodulated signal is equivalently eliminated as a direct current signal through an IQ calibration function.
11. A computer storage medium, characterized in that it stores at least one computer program which, when executed by a processor, performs at least one step of the communication method according to any one of claims 8-10.
CN202010536981.7A 2020-06-12 2020-06-12 Communication system, communication method, and computer storage medium Pending CN113810078A (en)

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