CN111416787A - Modem and baseband board card - Google Patents
Modem and baseband board card Download PDFInfo
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- CN111416787A CN111416787A CN202010301948.6A CN202010301948A CN111416787A CN 111416787 A CN111416787 A CN 111416787A CN 202010301948 A CN202010301948 A CN 202010301948A CN 111416787 A CN111416787 A CN 111416787A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
Abstract
The invention is suitable for the technical field of satellite communication, and provides a modem and a baseband board card, comprising: the system comprises a baseband processing module, a modulator module, a demodulator module and a demodulation self-checking module; the modulator module receives a baseband signal of the baseband processing module and modulates the baseband signal into a transmitting signal; the demodulation self-checking module sends a reference signal to the demodulator module and sends a detection signal to the baseband processing module; the demodulator module demodulates the received external signal and the reference signal into a first demodulation signal and also demodulates the transmission signal into a second demodulation signal; the baseband processing module judges whether the demodulator module works normally according to the first demodulation signal and the detection signal, and judges whether the modulator module works normally according to the second demodulation signal. The invention has extremely high integration level, can be used for modulation and demodulation, has self-checking and mutual-testing functions, and greatly improves the reliability and usability of the whole board card.
Description
Technical Field
The invention belongs to the technical field of satellite communication, and particularly relates to a modem and a baseband board card.
Background
In recent years, with the development of satellite communication technology, satellite communication systems have become more and more popular for people to work and live, and meanwhile, higher requirements are put forward on stability, cost, performance, batch test and the like of the satellite communication systems.
The traditional satellite communication baseband board cards have the defects of more independent board cards, higher cost, weaker expansibility and difficulty in systematic testing, and when sudden problems occur, other testing equipment is required, so that faults cannot be found in time, and unnecessary loss is caused.
Disclosure of Invention
In view of this, embodiments of the present invention provide a modem and a baseband board card, so as to solve the problems that in the prior art, many independent board cards of a conventional baseband board card are provided, and other test devices are required when a burst problem occurs.
A first aspect of an embodiment of the present invention provides a modem, including: the system comprises a baseband processing module, a modulator module, a demodulator module and a demodulation self-checking module; the baseband processing module is connected with the modulator module, the demodulator module and the demodulation self-checking module, the modulator module is further connected with the demodulator module and an external receiving end, and the demodulator module is further connected with an external sending end and the demodulation self-checking module;
the modulator module is used for receiving the baseband signal sent by the baseband processing module, modulating the baseband signal into a transmitting signal and sending the transmitting signal to an external receiving end and the demodulator module;
the demodulation self-checking module is used for sending a reference signal to the demodulator module and sending a detection signal to the baseband processing module;
the demodulator module is used for demodulating a received signal sent by an external sending end and the reference signal to obtain a first demodulation signal, sending the first demodulation signal to the baseband processing module, and demodulating the transmission signal into a second demodulation signal and sending the second demodulation signal to the baseband processing module;
the baseband processing module is further configured to determine whether the demodulator module operates normally according to the first demodulation signal and the detection signal, and further configured to determine whether the modulator module operates normally according to the second demodulation signal.
Further, the baseband processing module is also connected with an external network management server;
the baseband processing module is further configured to: and when the demodulator module is judged to work abnormally, sending demodulation fault information to the external network management server, and further, when the demodulator module is judged to work abnormally, sending modulation fault information to the external network management server.
Further, the demodulation fault information comprises fault position information of the demodulator module and fault maintenance scheme information of the demodulator module;
the modulation fault information includes fault location information of the modulator module and fault repair scenario information of the modulator module.
Further, the modulator module includes: an IQ (In-phase Quadrature) filtering unit, an up-conversion unit and a power self-regulation unit;
the input end of the IQ filtering unit is connected with the baseband processing module, the output end of the IQ filtering unit is connected with the input end of the up-conversion unit, and the output end of the up-conversion unit is connected with the input end of the power self-regulation unit; the output end of the power self-adjusting unit is connected with the baseband processing module, the demodulator module and an external receiving end; the baseband signal comprises two paths of IQ signals.
The IQ filtering unit is used for receiving the two paths of IQ signals sent by the baseband processing module, filtering the two paths of IQ signals and sending the two paths of IQ signals to the up-conversion unit;
the up-conversion unit is used for up-converting the two paths of filtered IQ signals into radio frequency signals with preset frequency and sending the radio frequency signals with the preset frequency to the power self-regulation unit;
the power self-adjusting unit is used for receiving a preset power control signal of the baseband processing module and adjusting the radio-frequency signal with the preset frequency into the transmitting signal according to the preset power control signal.
Further, the power self-adjustment unit is specifically configured to:
and adjusting the radio frequency signal with the preset frequency into the transmitting signal by an Automatic Gain Control (AGC) method according to the preset power Control signal.
Further, the demodulator module includes: the device comprises a combiner, an IQ demodulation unit, a down-conversion unit and a gain unit;
the combiner is connected with the input end of the IQ demodulation unit, the demodulation self-checking module and an external sending end, the input end of the IQ demodulation unit is also connected with the modulator module, the output end of the IQ demodulation unit is connected with the input end of the down-conversion unit, the output end of the down-conversion unit is connected with the input end of the gain unit, and the output end of the gain unit is connected with the baseband processing module;
the combiner converts the signal and the reference signal sent by the external sending end into a first signal;
the first signal sequentially passes through the IQ demodulation unit, the down-conversion unit and the gain unit to obtain a first demodulation signal;
or the transmitting signal sequentially passes through the IQ demodulation unit, the down-conversion unit and the gain unit to obtain the second demodulation signal.
Further, the demodulation self-test module comprises: the device comprises a local oscillation unit, an adjustable attenuation unit and a detection unit;
the input end of the local oscillator unit is connected with the baseband processing module, the output end of the local oscillator unit is connected with the input end of the adjustable attenuation unit, the output end of the adjustable attenuation unit is connected with the input end of the detection unit and the demodulator module, and the output end of the detection unit is connected with the baseband processing module;
the baseband processing module is further configured to control the local oscillation unit to send a local oscillation signal to the attenuation adjustable unit;
the adjustable attenuation unit is used for adjusting the local oscillator signal into the reference signal and sending the reference signal to the detection unit and the demodulator module;
the detection unit is used for detecting the reference signal into the detection signal and sending the detection signal to the baseband processing module.
Further, the modem further includes: a self-demodulation module; the self-demodulation module is connected with the modulator module;
the modulator module is further used for sending the transmission signal to the self-demodulation module;
the self-demodulation module is used for demodulating the transmitting signal into a third demodulation signal and judging whether the signal output by the modulator module is correct or not according to the third demodulation signal.
A second aspect of the embodiments of the present invention provides a baseband board card, including: a clock module further comprising a plurality of modems according to any of claims 1 to 8 connected to each of the clock modules; the clock module is also connected with an external sending end;
the clock module is used for receiving a clock signal of the external sending end and carrying out clock synchronization on each modem according to the clock signal.
Further, the clock module includes: a GPS (Global Positioning System) receiver, a switch, and an ATCA (Advanced telecommunications Computing Architecture) chassis;
the input end of the GPS receiver is connected with the external sending end, the output end of the GPS receiver is connected with the input end of the switch, the output end of the switch is connected with the input end of the ATCA case, and the output end of the ATCA case is connected with each modem;
the GPS receiver is used for sending the received clock signal sent by the external sending end to the ATCA case through the switch;
and the ATCA case sends the clock signal to each modem.
Compared with the prior art, the modem and the baseband board card of the embodiment of the invention have the following beneficial effects: the modem mainly comprises a baseband processing module, a modulator module, a demodulator module and a demodulation self-checking module, has high integration level and can be used for modulation and demodulation; the modulator module modulates the baseband signal into a transmitting signal, the demodulation self-detection module sends a reference signal to the demodulator module and sends a detection signal to the baseband processing module, and then the demodulator module demodulates the received signal and the reference signal into a first demodulation signal and also demodulates the transmitting signal into a second demodulation signal; the baseband processing module judges whether the demodulator module works normally or not according to the first demodulation signal and the detection signal, and judges whether the modulator module works normally or not according to the second demodulation signal, so that the functions of self-checking and mutual testing are realized, the test and fault location of the whole board card are facilitated, and the reliability and usability of the whole board card are greatly improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a modem according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a modulator module according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a demodulator module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a demodulation self-test module according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a baseband board card according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another baseband board card according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Referring to fig. 1, the present embodiment provides a modem 100, which includes a baseband processing module 110, a modulator module 120, a demodulator module 130, and a demodulation self-test module 140; the baseband processing module 110 is connected to the modulator module 120, the demodulator module 130 and the demodulation self-checking module 140, the modulator module 120 is further connected to the demodulator module 130 and an external receiving end, and the demodulator module 130 is further connected to an external transmitting end and the demodulation self-checking module 140.
Specifically, the modulator module 120 is configured to receive a baseband signal sent by the baseband processing module 110, for example, data to be transmitted, and modulate the baseband signal into a transmission signal to send the transmission signal to the external receiving terminal and the demodulator module 130, the preset frequency may be set by the baseband processing module 110 for the modulator module 120, the preset frequency may be set according to a frequency required by the external receiving terminal, that is, different preset frequencies are set according to different requirements, so as to meet requirements of various devices, and the applicability is high.
Meanwhile, the demodulator module 130 is configured to demodulate and send the received signal sent by the external sending end to the baseband processing module 110, so as to implement modulation and demodulation integration, and the integration level is high.
Secondly, the demodulation self-test module 140 is configured to send a reference signal to the demodulator module 130 and send a detection signal to the baseband processing module 110, where the detection signal can be used as a judgment signal for detecting the demodulator module 130 to judge whether the reception of the demodulator module 130 is accurate or not; further, the demodulator module 130 demodulates a signal and a reference signal sent by an external sending end according to the received signal into a first demodulation signal and sends the first demodulation signal to the baseband processing module 110, and the baseband processing module 110 determines whether the demodulator module 130 is working normally according to the first demodulation signal and the detection signal, and detects whether the demodulator module 130 is out of order in real time, thereby implementing a demodulation self-checking function.
In addition, the demodulator module 130 is further configured to demodulate the transmission signal into a second demodulation signal and send the second demodulation signal to the baseband processing module 110, and the baseband processing module 110 determines whether the modulator module 120 operates normally according to the second demodulation signal, that is, the second demodulation signal may be compared with the baseband signal, and determines whether the modulator module 120 operates normally and the modulated signal is accurate, so as to implement the modulation self-detection function.
In this embodiment, the frequencies of the first demodulation signal, the second demodulation signal, and the demodulation signal for demodulating the received external signal may be the same or different, and the baseband processing module 110 may set different or the same frequency for each demodulation signal according to different requirements.
The traditional satellite communication baseband modem board card is two independent board cards, partial circuit design is not perfect enough, cost is high, systematic testing is not easy to carry out, diagnosis of sudden problems of the whole satellite communication system is inconvenient, other testing equipment is needed, and based on the embodiment, the high-integration modem 100 is provided, so that the stability of the whole system is improved, self testing and problem timely positioning can be completed, and the modem integration can be used together with one board card.
The modem 100 mainly includes a baseband processing module 110, a modulator module 120, a demodulator module 130, and a demodulation self-test module 140, has high integration level, and can be used for modulation and demodulation; the baseband processing module 110 can determine whether the demodulator module 130 works normally according to the first demodulation signal and the detection signal, and can also determine whether the modulator module 120 works normally according to the second demodulation signal, so that the self-test function of demodulation and modulation is realized, the test and fault location of the whole board card are facilitated, and the reliability and usability of the whole board card are greatly improved.
Optionally, the baseband processing module 110 is further connected to an external network management server. The baseband processing module 110 further sends demodulation fault information to an external network management server when determining that the demodulator module 130 is abnormal, so as to notify network management personnel to handle the problem of the demodulator module 130 fault in time, or replace the main/standby facilities, and the like. Optionally, the demodulation fault information may include fault location information of the demodulator module 130 and fault maintenance scheme information of the demodulator module 130, and may also include fault location information of a specific circuit inside the demodulator module 130, such as a fault of the IQ demodulation unit 131, a fault of the gain unit 133, and the like, and a network administrator may timely perform operations such as maintaining or switching a main/standby facility, or replacing an element according to the fault maintenance scheme information, so as to locate a fault and timely find and solve the problem.
Optionally, the baseband processing module 110 further sends modulation fault information to an external network management server when determining that the modulator module 120 is abnormal, so as to notify network management personnel to handle the problem of the fault of the demodulator module 120 in time, or replace the primary and standby facilities, and the like. Optionally, the modulation fault information includes fault location information of the modulator module 120 and fault maintenance scheme information of the modulator module 120, and may also include fault location information of specific circuits inside the modulator module 120, such as a fault of the IQ filtering unit 121, a fault of the up-conversion unit 122, and the like, and a network administrator may timely perform operations such as maintaining or switching between main and standby facilities or replacing elements according to the fault maintenance scheme information, so as to implement fault location and timely find and solve a problem.
It should be understood that the structure of the baseband processing module 110 is not specifically limited in this embodiment, and may be an integration of an FPGA chip and a DA chip, or the like.
In one embodiment, referring to fig. 2, the modulator module 120 includes: an IQ filtering unit 121, an up-conversion unit 122 and a power self-regulation unit 123; the input end of the IQ filtering unit 121 is connected to the baseband processing module 110, the output end of the IQ filtering unit 121 is connected to the input end of the up-conversion unit 122, and the output end of the up-conversion unit 122 is connected to the input end of the power self-adjusting unit 123; the output end of the power self-adjusting unit 123 is connected to the baseband processing module 110, the demodulator module 130 and the external receiving end; the baseband signal comprises two paths of IQ signals.
The IQ filtering unit 121 receives the two IQ signals sent by the baseband processing module 110, filters the two IQ signals, and sends the filtered two IQ signals to the up-conversion unit 122; the up-conversion unit 122 up-converts the two filtered IQ signals into radio frequency signals with preset frequencies, and sends the radio frequency signals with the preset frequencies to the power self-adjustment unit 123; the power self-adjusting unit 123 receives the preset power control signal of the baseband processing module 110, and adjusts the radio frequency signal with the preset frequency into a transmission signal according to the preset power control signal. Optionally, the power self-adjusting unit 123 adjusts the radio frequency signal with the preset frequency into the transmission signal by using an AGC method according to the preset power control signal.
Specifically, the baseband processing module 110 converts the communication data into two IQ signals, the two IQ signals are sequentially converted into radio frequency signals with preset frequency by the IQ filtering unit 121 and the up-conversion unit 122, then the power self-adjustment unit 123 adjusts the radio frequency signals in an AGC manner, the signal power of the whole channel is automatically adjusted according to the preset power of the baseband processing module 110, and the signals are stably output after the output power of the signals reaches the preset power; optionally, the transmission signal may be divided into three paths through a shunt circuit, one path is a formal output port and is sent to an external receiving end, the other path is sent to the demodulator module 130 through the interface 1, the other path is sent to the demodulation module, the demodulation module demodulates the demodulation signal, and the demodulated information is fed back to the baseband processing module 110 again.
According to the present embodiment, according to the requirements of different output bandwidths, the up-conversion mirror image caused by the analog offset generated by the DA (digital to analog conversion) output inside the baseband processing module 110 can be filtered, and the power self-adjusting unit 123 can control the operation of the adjusting circuit through the baseband processing module 110 to perform compensation adjustment on the output signal of the up-conversion unit 122, so as to improve the accuracy of the output power of the modulator, and improve the quality of the signal transmitted by the modulator module 120.
It should be understood that the present embodiment does not specifically limit the structures of the IQ filtering unit 121, the up-conversion unit 122, and the power self-adjustment unit 123, and may be a chip, a circuit, or the like.
In one example, referring to fig. 3, the demodulator module 130 may include: a combiner, IQ demodulation unit 131, down conversion unit 132, and gain unit 133; the combiner is connected to the input end of the IQ demodulation unit 131, the demodulation self-test module 140, and the external transmitting end, the input end of the IQ demodulation unit 131 is further connected to the modulator module 120, the output end of the IQ demodulation unit 131 is connected to the input end of the down-conversion unit 132, the output end of the down-conversion unit 132 is connected to the input end of the gain unit 133, and the output end of the gain unit 133 is connected to the baseband processing module 110.
The combiner converts the signal and the reference signal sent by the external sending end into a first signal, and the first signal sequentially passes through the IQ demodulation unit 131, the down-conversion unit 132 and the gain unit 133 to obtain a first demodulation signal; or the transmission signal sequentially passes through the IQ demodulation unit 131, the down-conversion unit 132, and the gain unit 133 to obtain a first demodulation signal.
In practical applications, the baseband processing module 110 sets parameters of the IQ demodulation unit 131, the down-conversion unit 132, and the gain unit 133 according to different frequency requirements. The IQ demodulation unit 131 amplifies and demodulates the weak signal, and performs real-time filtering to eliminate out-of-band interference, thereby enhancing the demodulation capability of the whole system. Referring to fig. 3, the demodulator module may have three input ports: a formal input port connected with an external transmitting terminal for receiving satellite signals; the interface 2 receives the reference signal of the demodulation self-checking module 140, and the combiner combines the satellite signal and the reference signal into the reference signal to complete the demodulation of the self-checking module; interface 1 receives the transmitted signal and performs demodulation of the signal from modulator module 120.
Optionally, the demodulator module 130 may further include a switching element for switching the first signal, the satellite signal and the transmission signal to be demodulated. For example, when the demodulator module 130 is not subjected to fault detection, two paths of signals enter, namely, a satellite signal and a transmitting signal, and the satellite signal or the transmitting signal can be switched by the switch switching element to realize a demodulation function and a modulation self-detection function; when the demodulator module is subjected to fault detection, if a first signal and a transmission signal enter, the first signal or the transmission signal can be switched through the switch switching element, and the signal is amplified, filtered, demodulated and the like, and finally data is transmitted to the baseband processing module 110, so that the demodulation self-checking function and the modulation self-checking function are realized.
It should be understood that the present embodiment does not specifically limit the structures of the IQ demodulation unit 131, the down conversion unit 132, and the gain unit 133, and may be a chip, a circuit, or the like.
Further, referring to fig. 4, the demodulation self-test module 140 may include: a local oscillation unit 141, an adjustable attenuation unit 142 and a detection unit 143; the input end of the local oscillator unit 141 is connected to the baseband processing module 110, the output end of the local oscillator unit 141 is connected to the input end of the adjustable attenuation unit 142, the output end of the adjustable attenuation unit 142 is connected to the input end of the detection unit 143 and the demodulator module 130, and the output end of the detection unit 143 is connected to the baseband processing module 110.
The baseband processing module 110 controls the local oscillation unit 141 to send a local oscillation signal to the adjustable attenuation unit 142; the adjustable attenuation unit 142 adjusts the local oscillation signal into a reference signal, and sends the reference signal to the detection unit 143 and the demodulator module 130; the detection unit 143 detects the reference signal as a detection signal and transmits the detection signal to the baseband processing module 110.
The local oscillation unit 141, the adjustable attenuation unit 142 and the detection unit 143 cooperate with the demodulator module 130 to realize a self-checking function. Specifically, the local oscillator unit 141 is controlled by the baseband processing module 110, and is used as a known signal source of the demodulation self-check module 140, and sends signals to the demodulator module 130 and the detection unit through the adjustable attenuation unit 142, that is, one path is monitored and fed back to the baseband processing module 110 through the detection unit 143, the other path enters the demodulator module 130 through the splitter access interface 2, and is demodulated by the demodulator module 130, and then the demodulated data is sent to the baseband processing module 110, and the baseband processing module 110 identifies whether the demodulator module 130 is normal through comparison and judgment, if not, the baseband processing module 110 sends demodulation fault information to a network management server of the whole system, notifies a background user, and performs operations such as main-standby system switching, and ensures that the system continues to operate normally.
It should be understood that the present embodiment does not specifically limit the structures of the local oscillation unit 141, the adjustable attenuation unit 142, and the detection unit 143, and may be a chip, a circuit, or the like.
Further, the modem 100 further includes: a self-demodulation module 150; the self-demodulation module 150 is connected to the modulator module 120 and the baseband processing module 110. In the present embodiment, the specific structure of the self-demodulation module 150 is not specifically limited, and may be a chip, a circuit, or the like.
The modulator module 120 also sends the transmit signal to the self-demodulation module 150; the self-demodulation module 150 demodulates the transmission signal into a third demodulation signal, and determines whether the signal output by the modulator module 120 is correct according to the third demodulation signal. Optionally, the transmission signal may enter the self-demodulation module 150 through a coupler, the coupler serves as a shunt circuit, and the self-demodulation module 150 demodulates the transmission signal and determines whether the modulation signal is correct, thereby implementing a modulation-demodulation mutual detection function. Optionally, the self-demodulation module 150 may further generate an error signal to the baseband processing module 110 when it is determined that the modulation signal is incorrect, and the baseband processing module 110 reconfigures parameters of each unit in the modulator module 120 according to the error signal, so as to ensure accuracy of the output modulation signal.
The invention has a modulation self-test module, a demodulation self-test module and a modulation demodulation module, the baseband board card can carry out self test independently, and the labor and the equipment cost are saved when the board card is tested in batch; meanwhile, in the using process, when an emergency occurs, problem location can be facilitated.
In the above embodiment, the modem 100 mainly includes the baseband processing module 110, the modulator module 120, the demodulator module 130, and the demodulation self-test module 140, and has a high integration level, and can perform modulation and demodulation in common; the modulator module 120 modulates the baseband signal into a transmit signal, the demodulation self-test module 140 sends a local oscillation signal to the demodulator module 130 and sends a detection signal to the baseband processing module 110, and then the demodulator module 130 demodulates the received signal sent by the external transmitting end and the reference signal into a first demodulation signal and also demodulates the transmit signal into a second demodulation signal; the baseband processing module 110 determines whether the demodulator module 130 works normally according to the first demodulation signal and the detection signal, and also determines whether the modulator module 120 works normally according to the second demodulation signal, so that the functions of self-checking and mutual testing of modulation and demodulation are realized, the test and problem location of the whole board card are facilitated, and the reliability and usability of the whole board card are greatly improved.
Corresponding to the modem 100 in the embodiment, the embodiment further provides a baseband board. Referring specifically to fig. 5, the baseband board card mainly includes: the clock module 200 and the plurality of modems 100 connected to the clock module 200 as in any of the above embodiments also have the advantageous effects of the modems 100 as in any of the above embodiments. The clock module 200 is also connected to an external transmitting terminal. The clock module 200 is configured to receive a clock signal from an external transmitting end and synchronize each modem 100 according to the clock signal. It should be understood that the number of the modems 100 in this embodiment is not limited, and may be 1, 2, 3 or more.
Alternatively, referring to fig. 6, the clock module 200 may include: GPS receiver 210, switch 220, and ATCA chassis 230; the input end of the GPS receiver 210 is connected to an external transmitting end, the output end of the GPS receiver 210 is connected to the input end of the switch 220, the output end of the switch 220 is connected to the input end of the ATCA chassis 230, and the output end of the ATCA chassis 230 is connected to each modem 100. The GPS receiver 210 sends the received clock signal sent by the external sending end to the ATCA chassis 230 through the switch 220; ATCA chassis 230 sends a clock signal to each modem 100.
In the conventional clock synchronization, the modulation board in the baseband board card is used for distributing the clock, and the baseband processing board is used as a clock distribution source, which brings inconvenience to the expansion of the whole system.
For example, the GPS receiver 210 receives 10M clocks and 1PPS from a satellite and distributes the received clocks to the entire ATCA chassis 230 through the switch 220, and all boards in the chassis receive the same 10M clocks and 1PPS as clocks, and finally achieve synchronization. In the using process, the whole system can be infinitely expanded without the limitation of board cards according to different requirements, and the system utilization maximization is achieved.
In the above embodiment, the chassis switch 220 is used as the clock distribution source instead of the modulation board to provide clock distribution, and the clock of the GPS receiver 210 is distributed to each board in the system, which is convenient for system expansion. The invention has the advantages of good reliability, high integration level, easy use and the like, and can be used in a satellite communication system.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the system is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A modem, comprising: the system comprises a baseband processing module, a modulator module, a demodulator module and a demodulation self-checking module; the baseband processing module is connected with the modulator module, the demodulator module and the demodulation self-checking module, the modulator module is further connected with the demodulator module and an external receiving end, and the demodulator module is further connected with an external sending end and the demodulation self-checking module;
the modulator module is used for receiving the baseband signal sent by the baseband processing module, modulating the baseband signal into a transmitting signal and sending the transmitting signal to an external receiving end and the demodulator module;
the demodulation self-checking module is used for sending a reference signal to the demodulator module and sending a detection signal to the baseband processing module;
the demodulator module is used for demodulating a received signal sent by an external sending end and the reference signal to obtain a first demodulation signal, sending the first demodulation signal to the baseband processing module, and demodulating the transmission signal into a second demodulation signal and sending the second demodulation signal to the baseband processing module;
the baseband processing module is further configured to determine whether the demodulator module operates normally according to the first demodulation signal and the detection signal, and further configured to determine whether the modulator module operates normally according to the second demodulation signal.
2. The modem of claim 1, wherein the baseband processing module is further connected to an external network management server;
the baseband processing module is further configured to: and when the demodulator module is judged to work abnormally, sending demodulation fault information to the external network management server, and further, when the demodulator module is judged to work abnormally, sending modulation fault information to the external network management server.
3. The modem of claim 2, wherein the demodulation failure information includes failure location information of the demodulator module and failure repair scenario information of the demodulator module;
the modulation fault information includes fault location information of the modulator module and fault repair scenario information of the modulator module.
4. The modem of claim 1, wherein the modulator module comprises: the device comprises an IQ filtering unit, an up-conversion unit and a power self-regulation unit;
the input end of the IQ filtering unit is connected with the baseband processing module, the output end of the IQ filtering unit is connected with the input end of the up-conversion unit, and the output end of the up-conversion unit is connected with the input end of the power self-regulation unit; the output end of the power self-adjusting unit is connected with the baseband processing module, the demodulator module and an external receiving end; the baseband signal comprises two paths of IQ signals.
The IQ filtering unit is used for receiving the two paths of IQ signals sent by the baseband processing module, filtering the two paths of IQ signals and sending the two paths of IQ signals to the up-conversion unit;
the up-conversion unit is used for up-converting the two paths of filtered IQ signals into radio frequency signals with preset frequency and sending the radio frequency signals with the preset frequency to the power self-regulation unit;
the power self-adjusting unit is used for receiving a preset power control signal of the baseband processing module and adjusting the radio-frequency signal with the preset frequency into the transmitting signal according to the preset power control signal.
5. The modem of claim 4, wherein the power self-adjustment unit is specifically to:
and adjusting the radio frequency signal with the preset frequency into the transmitting signal by an AGC method according to the preset power control signal.
6. The modem of claim 1, wherein the demodulator module comprises: the device comprises a combiner, an IQ demodulation unit, a down-conversion unit and a gain unit;
the combiner is connected with the input end of the IQ demodulation unit, the demodulation self-checking module and an external sending end, the input end of the IQ demodulation unit is also connected with the modulator module, the output end of the IQ demodulation unit is connected with the input end of the down-conversion unit, the output end of the down-conversion unit is connected with the input end of the gain unit, and the output end of the gain unit is connected with the baseband processing module;
the combiner converts the signal and the reference signal sent by the external sending end into a first signal;
the first signal sequentially passes through the IQ demodulation unit, the down-conversion unit and the gain unit to obtain a first demodulation signal;
or the transmitting signal sequentially passes through the IQ demodulation unit, the down-conversion unit and the gain unit to obtain the second demodulation signal.
7. The modem of claim 1, wherein the demodulation self-test module comprises: the device comprises a local oscillation unit, an adjustable attenuation unit and a detection unit;
the input end of the local oscillator unit is connected with the baseband processing module, the output end of the local oscillator unit is connected with the input end of the adjustable attenuation unit, the output end of the adjustable attenuation unit is connected with the input end of the detection unit and the demodulator module, and the output end of the detection unit is connected with the baseband processing module;
the baseband processing module is further configured to control the local oscillation unit to send a local oscillation signal to the attenuation adjustable unit;
the adjustable attenuation unit is used for adjusting the local oscillator signal into the reference signal and sending the reference signal to the detection unit and the demodulator module;
the detection unit is used for detecting the reference signal into the detection signal and sending the detection signal to the baseband processing module.
8. The modem of any one of claims 1 to 7, wherein the modem further comprises: a self-demodulation module; the self-demodulation module is connected with the modulator module;
the modulator module is further used for sending the transmission signal to the self-demodulation module;
the self-demodulation module is used for demodulating the transmitting signal into a third demodulation signal and judging whether the signal output by the modulator module is correct or not according to the third demodulation signal.
9. A baseband board comprising a clock module, and further comprising a plurality of modems according to any of claims 1 to 8 connected to each of said clock modules; the clock module is also connected with an external sending end;
the clock module is used for receiving a clock signal of the external sending end and carrying out clock synchronization on each modem according to the clock signal.
10. The baseband card of claim 9, wherein said clock module comprises: GPS receiver, exchanger and ATCA machine case;
the input end of the GPS receiver is connected with the external sending end, the output end of the GPS receiver is connected with the input end of the switch, the output end of the switch is connected with the input end of the ATCA case, and the output end of the ATCA case is connected with each modem;
the GPS receiver is used for sending the received clock signal sent by the external sending end to the ATCA case through the switch;
and the ATCA case sends the clock signal to each modem.
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