CN109495179B - X-band wide-band high-capacity communication device - Google Patents

X-band wide-band high-capacity communication device Download PDF

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Publication number
CN109495179B
CN109495179B CN201811554055.1A CN201811554055A CN109495179B CN 109495179 B CN109495179 B CN 109495179B CN 201811554055 A CN201811554055 A CN 201811554055A CN 109495179 B CN109495179 B CN 109495179B
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China
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module
output
signal
decoding
frequency
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CN201811554055.1A
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Chinese (zh)
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CN109495179A (en
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任文成
全亮
李志勇
王晓春
何占林
宋迎东
毛晶晶
韩燕杰
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中国电子科技集团公司第五十四研究所
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/40Transceivers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/005Details 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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25Arrangements specific to fibre transmission
    • H04B10/2589Bidirectional transmission
    • H04B10/25891Transmission components
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50Transmitters
    • H04B10/516Details of coding or modulation

Abstract

The invention discloses an X-band wide-band high-capacity communication device, and belongs to the technical field of wireless microwave communication. The indoor unit and the outdoor unit are connected through optical fibers; the indoor unit comprises a monitoring service card, a security card and a first digital optical interface; the outdoor unit comprises a second digital optical interface, a baseband processing board card, a wireless broadband data conditioner, a transmitter, a power amplifier, an electric tuning duplexer, an antenna, a low noise amplifier and a receiver; the baseband processing board card carries out local monitoring; the optical fiber is connected between the first digital optical interface and the second digital optical interface. The device has the advantages of compact structure, low cost and convenient installation, and is suitable for being popularized and applied to occasions with the requirements of line-of-sight broadband microwave communication.

Description

X-band wide-band high-capacity communication device

Technical Field

The invention belongs to the technical field of wireless microwave communication, and particularly relates to an X-band wide-band large-capacity communication device.

Background

Under the normal condition, the X-band microwave communication equipment is fixed in a certain communication bandwidth in the X band to receive and transmit wireless data, and does not support adjustable receiving and transmitting frequency points. At this time, if a strong interference signal exists continuously in the frequency band, the communication link will be interrupted, and the normal communication function cannot be performed.

In addition, as one of the widely used wireless communication means, microwave communication is evolving in the direction of transmission broadband, service IP, service intelligence, and the like, and it is required that microwave devices can provide data transmission with a larger capacity than ever before.

Therefore, the anti-interference and high-capacity transmission performance of the X-band microwave communication equipment in the prior art needs to be enhanced.

Disclosure of Invention

In view of this, the present invention provides an X-band wide-band large-capacity communication device, which has the characteristics of strong anti-interference performance, large communication capacity, compact structure, and small equipment quantity.

In order to achieve the purpose, the invention adopts the technical scheme that:

an X-band wide-band large-capacity communication device comprises an indoor unit and an outdoor unit, wherein the indoor unit and the outdoor unit are connected through an optical fiber; the indoor unit comprises a monitoring service card 1, a service card 2, a security card 3 and a first digital optical interface 4; the outdoor unit is provided with a transmitting channel and a receiving channel, the transmitting channel comprises a second digital optical interface 5, a baseband processing board 6, a wireless broadband data conditioner 7, a transmitter 8, a power amplifier 9, an electric tuning duplexer 10 and an antenna 11 which are connected in sequence, the receiving channel comprises an antenna 11, an electric tuning duplexer 10, a low noise amplifier 13, a receiver 12, a wireless broadband data conditioner 7, a baseband processing board 6 and a second digital optical interface 5 which are connected in sequence, and the transmitting channel and the receiving channel share the second digital optical interface 5, the baseband processing board 6, the wireless broadband data conditioner 7, the electric tuning duplexer 10 and the antenna 11; the baseband processing board 6 locally monitors the wireless broadband data conditioner 7, the transmitter 8, the power amplifier 9, the receiver 12, the low noise amplifier 13 and the baseband processing board 6; the optical fiber is connected between the first digital optical interface 4 and the second digital optical interface 5;

when data is sent, a service signal sent from the outside is encrypted by the security card 3, and then is subjected to synchronous auxiliary multiplexing processing with monitoring service information sent by the monitoring service card 1 to form a combined signal, the combined signal is converted into an optical signal by an electric signal through the first digital optical interface 4 and then is transmitted to the second digital optical interface 5 through an optical fiber, the optical signal is converted into an electric signal by the second digital optical interface 5, the combined signal is restored and is transmitted to the baseband processing board 6, the baseband processing board 6 is subjected to auxiliary tapping processing on the combined signal to separate service information and monitoring information, the service information comprises a service clock and service data, wherein the monitoring information is used for carrying out parameter setting on the wireless broadband data conditioner 7, the sender 8, the power amplifier 9, the electrical modulation duplexer 10 and the receiver 12, and the service information is transmitted to the wireless broadband data conditioner 7, the wireless broadband data conditioner 7 performs channel coding and high-order modulation on the service information, generates a baseband waveform suitable for microwave wireless channel transmission, then modulating the baseband waveform to a low intermediate frequency, performing digital-to-analog conversion and up-conversion, outputting an intermediate frequency signal to the transmitter 8, sampling the intermediate frequency signal by the transmitter 8 on one hand to detect the intermediate frequency transmission power, performing up-conversion on the intermediate frequency signal on the other hand, converting the signal frequency from the intermediate frequency to a transmission radio frequency under a local monitoring setting, amplifying the radio frequency signal output by the transmitter 8 to an output power required by the local monitoring by the power amplifier 9, and simultaneously, sampling the amplified radio frequency signal to obtain radio frequency output power, filtering the amplified radio frequency signal by the electrical modulation duplexer 10 to filter out signal components outside a transmitting frequency band, and feeding the filtered signal into a microwave wireless channel by an antenna 11 for transmission;

during data receiving, the electrical modulation duplexer 10 filters the radio frequency signal received by the antenna 11, filters clutter interference outside the receiving frequency band, separates out the signal in the receiving frequency band, the low noise amplifier 13 amplifies the signal separated by the electrical modulation duplexer 10, the receiver 12 down-converts the signal amplified by the low noise amplifier 13, converts the radio frequency signal in the X-band to an intermediate frequency signal, the wireless broadband data conditioner 7 down-converts the intermediate frequency signal output by the receiver 12 to zero intermediate frequency, then performs analog-to-digital conversion, high order demodulation and channel decoding, outputs service information, the baseband processing board 6 performs auxiliary multiple reception processing on the service information output by the wireless broadband data conditioner 7 together with local monitoring information to generate group channel information, and the group channel information is converted into optical signals at the second digital optical interface 5, the first digital optical interface 4 converts the optical signal into an electrical signal and sends the electrical signal to the service card 2 for tapping processing, the security card 3 decrypts the service information tapped by the service card 2 and sends the decrypted information to the corresponding interface circuit of the service card 2 for output, and the monitoring and service information generated by tapping processing is displayed and output at the monitoring service card 1.

Specifically, the wireless broadband data conditioner 7 includes a down-conversion module 14, an a/D conversion module 15, a high-order modulation/demodulation module 16, an LDPC coding/decoding module 17, an up-conversion module 18, and a D/a conversion module 19;

when receiving data, the down-conversion module 14 performs down-conversion operation on the intermediate frequency signal output by the receiver 12 to output a zero intermediate frequency signal, the a/D conversion module 15 performs analog-digital conversion on the zero intermediate frequency signal to output digital IQ two-path signals, the high-order modulation and demodulation module 16 performs demodulation processing on the two-path digital signals to output demodulation codes and demodulation clock signals, the LDPC coding and decoding module 17 performs LDPC channel decoding processing by using the demodulation codes and the demodulation clock signals to recover service information, and sends the information to the baseband processing board 6 in the form of decoding clocks and decoding data;

when data is sent, the LDPC coding and decoding module 17 performs LDPC channel coding processing by using the service clock and the service data output by the baseband processing board 6, outputs the coding clock and the coding data to the high-order modulation and demodulation module 16, performs high-order modulation processing on the coding data by the high-order modulation and demodulation module 16, outputs a digital low-intermediate frequency signal to the D/a conversion module 19 for digital-analog conversion, and up-converts the converted analog zero-intermediate frequency signal to an intermediate frequency point at the up-conversion module 18, and then sends the intermediate frequency signal to the transmitter 8 for further processing.

Specifically, the high-order modem module 16 includes a matched filter module 20, a modulation interpolation module 21, a synchronization module 22, a channel equalization module 23, a constellation mapping module 24, a frame synchronization module 25, a demodulation interpolation module 26, a baseband shaping module 27, a constellation mapping module 28, and a serial/parallel conversion module 29;

when receiving data, the matched filtering module 20 performs matched filtering processing on a zero intermediate frequency signal output by the a/D conversion module 15, the matched filtered signal performs interpolation processing at the modulation interpolation module 21, the synchronization module 22 extracts carrier phase information from the interpolated signal output by the modulation interpolation module 21, the channel equalization module 23 performs LMS channel equalization on the interpolated signal output by the modulation interpolation module 21 by using the carrier phase information extracted by the synchronization module 22, the output equalization result is demapped into constellation map points by the constellation map module 24, the frame synchronization module 25 performs frame positioning by using output bits of the constellation map module 24 to extract a frame header, outputs a demodulated clock signal and a demodulation clock signal, and sends frame positioning information to the LDPC coding and decoding module 17 for LDPC decoding operation;

when data is transmitted, the serial/parallel conversion module 29 performs serial/parallel conversion on the coded output of the LDPC coding module 17, the two output parallel signals are mapped into two digital signals at the constellation mapping module 28, the baseband forming module 27 performs baseband forming on the two digital signals, respectively, the demodulation interpolation module 26 performs interpolation on the baseband formed signals output by the baseband forming module 27, and sends the output low-intermediate frequency signals to the D/a conversion module 19.

Specifically, the LDPC encoding and decoding module 17 includes a frame header detection module 30, an LDPC decoding core module 31, a decoding output buffer module 32, an encoding output buffer module 33, an LDPC encoding core module 34, and an encoding input buffer module 35;

when receiving data, the frame header detection module 30 processes the demodulated and demodulated clock signals output by the frame synchronization module 25 to obtain a decoding clock and soft information to be decoded, the LDPC decoding core module 31 performs decoding output hard decision by using the soft information to be decoded to output a decoded bit stream, the decoding output buffer module 32 buffers the decoded bit stream, adjusts the decoding clock, outputs the bit clock, and then transmits the buffered decoded bit stream and bit clock to the baseband processing board 6;

when data is sent, the service clock and the service data of the baseband processing board 6 are buffered and code rate adjusted at the encoding input buffer module 35 and output to the LDPC encoding core module 34, the LDPC encoding core module 34 encodes the buffered service clock and service data and outputs an encoded bit stream and an encoded clock, and the encoding output buffer module 33 performs frame header adding processing on the encoded bit stream and the encoded clock and outputs the result to the serial/parallel conversion module 29.

Specifically, the electrical tunable duplexer 10 includes a first directional coupler 36, a receiver filter 37, a second directional coupler 38, a first frequency calibration unit 39, a first driving board 40, a first stepping motor 41, a first transmission mechanism 42, a third directional coupler 43, a transmitter filter 44, a fourth directional coupler 45, a second frequency calibration unit 46, a second driving board 47, a second stepping motor 48, a second transmission mechanism 49, and a circulator 50;

when data is sent, the baseband processing board 6 sends a local monitoring signal to the second driving board 47, the second driving board 47 controls the second stepping motor 48 to operate, the second stepping motor 48 tunes the transmitter filter 44 through the second transmission mechanism 49, so as to filter the radio frequency signal sent by the power amplifier 9, and the filtered signal is sent to the antenna 11 through the circulator 50;

during data receiving, the circulator 50 separates a received signal received from the antenna 11, meanwhile, the baseband processing board 6 sends a local monitoring signal to the first driving board 40, the first driving board 40 controls the first stepping motor 41 to operate, the first stepping motor 41 tunes the receiver filter 37 through the first transmission mechanism 42, the receiver filter 37 filters the signal separated by the circulator 50, and sends the filtered signal to the low noise amplifier 13;

the first directional coupler 36 and the second directional coupler 38 are respectively disposed at an output end and an input end of the receiver filter 37, and the first frequency calibration unit 39 collects an output signal of the receiver filter 37 through the first directional coupler 36 and performs feedback adjustment on an input of the receiver filter 37 through the second directional coupler 38, so as to correct a frequency offset;

the fourth directional coupler 45 and the third directional coupler 43 are respectively disposed at the output end and the input end of the transmitter filter 44, and the second frequency calibration unit 46 collects the output signal of the transmitter filter 44 through the fourth directional coupler 45, and performs feedback adjustment on the input of the transmitter filter 44 through the third directional coupler 43, thereby performing the function of calibrating the frequency offset.

Compared with the prior art, the invention has the following beneficial effects:

1. the electrically tunable duplexer adopted in the invention can change the receiving and transmitting frequency point according to the quality of the communication link under the control of the monitoring signal, thereby changing the communication frequency range in the X wave band, enhancing the anti-interference performance of the equipment and improving the transmission reliability of the equipment in a complex electromagnetic environment.

2. The invention adopts high-order modulation and demodulation and an advanced LDPC channel coding and decoding technology, overcomes the intersymbol interference introduced by the channel and can provide data transmission with larger capacity than the prior art.

3. The invention has the advantages of high integration degree, less equipment amount, small volume, stable and reliable performance, convenient maintenance and popularization and application value.

Drawings

FIG. 1 is an electrical schematic block diagram of an X-band wideband high capacity communications device in an embodiment of the present invention;

FIG. 2 is an electrical schematic block diagram of the wireless broadband data conditioner of FIG. 1;

FIG. 3 is an electrical schematic block diagram of the high order modem module of FIG. 1;

FIG. 4 is an electrical schematic block diagram of the LDPC encoding and decoding module of FIG. 1;

fig. 5 is an electrical schematic block diagram of the electrical tunable duplexer in fig. 1.

Detailed Description

The invention is described in further detail below with reference to the figures and the detailed description.

An X-band wide-band large-capacity communication device comprises an indoor unit and an outdoor unit, wherein the indoor unit and the outdoor unit are connected through an optical fiber; the indoor unit comprises a monitoring service card 1, a service card 2, a security card 3 and a first digital optical interface 4; the outdoor unit is provided with a transmitting channel and a receiving channel, the transmitting channel comprises a second digital optical interface 5, a baseband processing board 6, a wireless broadband data conditioner 7, a transmitter 8, a power amplifier 9, an electric tuning duplexer 10 and an antenna 11 which are connected in sequence, the receiving channel comprises an antenna 11, an electric tuning duplexer 10, a low noise amplifier 13, a receiver 12, a wireless broadband data conditioner 7, a baseband processing board 6 and a second digital optical interface 5 which are connected in sequence, and the transmitting channel and the receiving channel share the second digital optical interface 5, the baseband processing board 6, the wireless broadband data conditioner 7, the electric tuning duplexer 10 and the antenna 11; the baseband processing board 6 locally monitors the wireless broadband data conditioner 7, the transmitter 8, the power amplifier 9, the receiver 12, the low noise amplifier 13 and the baseband processing board 6; the optical fiber is connected between the first digital optical interface 4 and the second digital optical interface 5;

when data is sent, a service signal sent from the outside is encrypted by the security card 3, and then is subjected to synchronous auxiliary multiplexing processing with monitoring service information sent by the monitoring service card 1 to form a combined signal, the combined signal is converted into an optical signal by an electric signal through the first digital optical interface 4 and then is transmitted to the second digital optical interface 5 through an optical fiber, the optical signal is converted into an electric signal by the second digital optical interface 5, the combined signal is restored and is transmitted to the baseband processing board 6, the baseband processing board 6 is subjected to auxiliary tapping processing on the combined signal to separate service information and monitoring information, the service information comprises a service clock and service data, wherein the monitoring information is used for carrying out parameter setting on the wireless broadband data conditioner 7, the sender 8, the power amplifier 9, the electrical modulation duplexer 10 and the receiver 12, and the service information is transmitted to the wireless broadband data conditioner 7, the wireless broadband data conditioner 7 performs channel coding and high-order modulation on the service information, generates a baseband waveform suitable for microwave wireless channel transmission, then modulating the baseband waveform to a low intermediate frequency, performing digital-to-analog conversion and up-conversion, outputting an intermediate frequency signal to the transmitter 8, sampling the intermediate frequency signal by the transmitter 8 on one hand to detect the intermediate frequency transmission power, performing up-conversion on the intermediate frequency signal on the other hand, converting the signal frequency from the intermediate frequency to a transmission radio frequency under a local monitoring setting, amplifying the radio frequency signal output by the transmitter 8 to an output power required by the local monitoring by the power amplifier 9, and simultaneously, sampling the amplified radio frequency signal to obtain radio frequency output power, filtering the amplified radio frequency signal by the electrical modulation duplexer 10 to filter out signal components outside a transmitting frequency band, and feeding the filtered signal into a microwave wireless channel by an antenna 11 for transmission;

during data receiving, the electrical modulation duplexer 10 filters the radio frequency signal received by the antenna 11, filters clutter interference outside the receiving frequency band, separates out the signal in the receiving frequency band, the low noise amplifier 13 amplifies the signal separated by the electrical modulation duplexer 10, the receiver 12 down-converts the signal amplified by the low noise amplifier 13, converts the radio frequency signal in the X-band to an intermediate frequency signal, the wireless broadband data conditioner 7 down-converts the intermediate frequency signal output by the receiver 12 to zero intermediate frequency, then performs analog-to-digital conversion, high order demodulation and channel decoding, outputs service information, the baseband processing board 6 performs auxiliary multiple reception processing on the service information output by the wireless broadband data conditioner 7 together with local monitoring information to generate group channel information, and the group channel information is converted into optical signals at the second digital optical interface 5, the first digital optical interface 4 converts the optical signal into an electrical signal and sends the electrical signal to the service card 2 for tapping processing, the security card 3 decrypts the service information tapped by the service card 2 and sends the decrypted information to the corresponding interface circuit of the service card 2 for output, and the monitoring and service information generated by tapping processing is displayed and output at the monitoring service card 1.

Specifically, the wireless broadband data conditioner 7 includes a down-conversion module 14, an a/D conversion module 15, a high-order modulation/demodulation module 16, an LDPC coding/decoding module 17, an up-conversion module 18, and a D/a conversion module 19;

when receiving data, the down-conversion module 14 performs down-conversion operation on the intermediate frequency signal output by the receiver 12 to output a zero intermediate frequency signal, the a/D conversion module 15 performs analog-digital conversion on the zero intermediate frequency signal to output digital IQ two-path signals, the high-order modulation and demodulation module 16 performs demodulation processing on the two-path digital signals to output demodulation codes and demodulation clock signals, the LDPC coding and decoding module 17 performs LDPC channel decoding processing by using the demodulation codes and the demodulation clock signals to recover service information, and sends the information to the baseband processing board 6 in the form of decoding clocks and decoding data;

when data is sent, the LDPC coding and decoding module 17 performs LDPC channel coding processing by using the service clock and the service data output by the baseband processing board 6, outputs the coding clock and the coding data to the high-order modulation and demodulation module 16, performs high-order modulation processing on the coding data by the high-order modulation and demodulation module 16, outputs a digital low-intermediate frequency signal to the D/a conversion module 19 for digital-analog conversion, and up-converts the converted analog zero-intermediate frequency signal to an intermediate frequency point at the up-conversion module 18, and then sends the intermediate frequency signal to the transmitter 8 for further processing.

Specifically, the high-order modem module 16 includes a matched filter module 20, a modulation interpolation module 21, a synchronization module 22, a channel equalization module 23, a constellation mapping module 24, a frame synchronization module 25, a demodulation interpolation module 26, a baseband shaping module 27, a constellation mapping module 28, and a serial/parallel conversion module 29;

when receiving data, the matched filtering module 20 performs matched filtering processing on a zero intermediate frequency signal output by the a/D conversion module 15, the matched filtered signal performs interpolation processing at the modulation interpolation module 21, the synchronization module 22 extracts carrier phase information from the interpolated signal output by the modulation interpolation module 21, the channel equalization module 23 performs LMS channel equalization on the interpolated signal output by the modulation interpolation module 21 by using the carrier phase information extracted by the synchronization module 22, the output equalization result is demapped into constellation map points by the constellation map module 24, the frame synchronization module 25 performs frame positioning by using output bits of the constellation map module 24 to extract a frame header, outputs a demodulated clock signal and a demodulation clock signal, and sends frame positioning information to the LDPC coding and decoding module 17 for LDPC decoding operation;

when data is transmitted, the serial/parallel conversion module 29 performs serial/parallel conversion on the coded output of the LDPC coding module 17, the two output parallel signals are mapped into two digital signals at the constellation mapping module 28, the baseband forming module 27 performs baseband forming on the two digital signals, respectively, the demodulation interpolation module 26 performs interpolation on the baseband formed signals output by the baseband forming module 27, and sends the output low-intermediate frequency signals to the D/a conversion module 19.

Specifically, the LDPC encoding and decoding module 17 includes a frame header detection module 30, an LDPC decoding core module 31, a decoding output buffer module 32, an encoding output buffer module 33, an LDPC encoding core module 34, and an encoding input buffer module 35;

when receiving data, the frame header detection module 30 processes the demodulated and demodulated clock signals output by the frame synchronization module 25 to obtain a decoding clock and soft information to be decoded, the LDPC decoding core module 31 performs decoding output hard decision by using the soft information to be decoded to output a decoded bit stream, the decoding output buffer module 32 buffers the decoded bit stream, adjusts the decoding clock, outputs the bit clock, and then transmits the buffered decoded bit stream and bit clock to the baseband processing board 6;

when data is sent, the service clock and the service data of the baseband processing board 6 are buffered and code rate adjusted at the encoding input buffer module 35 and output to the LDPC encoding core module 34, the LDPC encoding core module 34 encodes the buffered service clock and service data and outputs an encoded bit stream and an encoded clock, and the encoding output buffer module 33 performs frame header adding processing on the encoded bit stream and the encoded clock and outputs the result to the serial/parallel conversion module 29.

Specifically, the electrical tunable duplexer 10 includes a first directional coupler 36, a receiver filter 37, a second directional coupler 38, a first frequency calibration unit 39, a first driving board 40, a first stepping motor 41, a first transmission mechanism 42, a third directional coupler 43, a transmitter filter 44, a fourth directional coupler 45, a second frequency calibration unit 46, a second driving board 47, a second stepping motor 48, a second transmission mechanism 49, and a circulator 50;

when data is sent, the baseband processing board 6 sends a local monitoring signal to the second driving board 47, the second driving board 47 controls the second stepping motor 48 to operate, the second stepping motor 48 tunes the transmitter filter 44 through the second transmission mechanism 49, so as to filter the radio frequency signal sent by the power amplifier 9, and the filtered signal is sent to the antenna 11 through the circulator 50;

during data receiving, the circulator 50 separates a received signal received from the antenna 11, meanwhile, the baseband processing board 6 sends a local monitoring signal to the first driving board 40, the first driving board 40 controls the first stepping motor 41 to operate, the first stepping motor 41 tunes the receiver filter 37 through the first transmission mechanism 42, the receiver filter 37 filters the signal separated by the circulator 50, and sends the filtered signal to the low noise amplifier 13;

the first directional coupler 36 and the second directional coupler 38 are respectively disposed at an output end and an input end of the receiver filter 37, and the first frequency calibration unit 39 collects an output signal of the receiver filter 37 through the first directional coupler 36 and performs feedback adjustment on an input of the receiver filter 37 through the second directional coupler 38, so as to correct a frequency offset;

the fourth directional coupler 45 and the third directional coupler 43 are respectively disposed at the output end and the input end of the transmitter filter 44, and the second frequency calibration unit 46 collects the output signal of the transmitter filter 44 through the fourth directional coupler 45, and performs feedback adjustment on the input of the transmitter filter 44 through the third directional coupler 43, thereby performing the function of calibrating the frequency offset.

Specifically, referring to fig. 1, an X-band broadband large-capacity communication device includes a monitoring service card 1, a service card 2, a security card 3, a digital optical interface 4, a digital optical interface 5, a baseband processing board 6, a wireless broadband data conditioner 7, a transmitter 8, a power amplifier 9, a power tunable duplexer 10, an antenna 11, a receiver 12, and a low noise amplifier 13.

When data is sent, a service signal sent from the outside is encrypted by the security card 3, then synchronous auxiliary multiplexing processing is carried out on the service signal and monitoring service information sent from the monitoring service card 1 to form a combined signal transmitted by a channel, the combined signal is converted into an optical signal from an electric signal through the digital optical interface 4, then the optical signal is transmitted to the digital optical interface 5 through a remote optical fiber, the digital optical interface 5 carries out photoelectric conversion to restore the combined signal, and the baseband processing board card 6 carries out auxiliary tapping processing on the combined signal to separate out the service information and the monitoring information. The monitoring information sets parameters of the wireless broadband data conditioner 7, the transmitter 8, the power amplifier 9, the electrical tunable duplexer 10 and the receiver 12. The wireless broadband data conditioner 7 performs channel coding and high-order modulation on the separated service information, generates a baseband waveform suitable for transmission in a microwave wireless channel, modulates the baseband waveform to a low intermediate frequency, and finally outputs a 1.6GHz intermediate frequency signal through digital-to-analog conversion and up-conversion operation, the transmitter 8 samples the intermediate frequency signal to detect intermediate frequency transmission power on one hand, performs up-conversion processing on the intermediate frequency signal on the other hand, converts the signal frequency from the intermediate frequency to a transmission radio frequency under monitoring setting, the power amplifier 9 amplifies the radio frequency signal output by the transmitter 8 to required output power, and simultaneously samples the radio frequency output signal to obtain information such as radio frequency output power, the radio frequency output is filtered by the electrically tunable duplexer 10, and finally the signal is fed to the microwave wireless channel by the antenna 11 for transmission.

Data reception is basically the reverse operation of data transmission. Firstly, the electrical modulation duplexer 10 filters the weak radio frequency signal received by the antenna 11 to separate out the signal in the receiving frequency band of interest, then the low noise amplifier 13 amplifies the signal to make the power of the signal meet the processing requirement, the receiver 12 performs down-conversion processing on the signal to convert the radio frequency signal in the X wave band to the 1.2GHz intermediate frequency signal, then the wireless broadband data conditioner 7 down-converts the intermediate frequency signal to zero intermediate frequency, the analog-to-digital conversion is followed by high-order demodulation and channel decoding to output the service information, the baseband processing board 6 performs auxiliary multiplexing processing on the service information and the local monitoring state information to generate group channel information, the group channel information is converted into the optical signal transmitted in the digital optical fiber at the digital optical interface 5, the digital optical interface 4 receives the optical signal transmitted in the digital optical fiber, and send it to the business card 2 and carry on the tapping process, the security card carries on the decipher process to the encrypted business information and sends to the corresponding interface circuit to export, monitor and service information that tapping process produce get display and output in monitoring the service card 1.

Referring to fig. 2, the wireless broadband data conditioner 7 includes a down-conversion module 14, an a/D conversion module 15, a high-order modem module 16, an LDPC coding module 17, an up-conversion module 18, and a D/a conversion module 19.

The down-conversion module 14 performs down-conversion operation on the 1.2GHz intermediate frequency signal output by the receiver 12 to output a zero intermediate frequency signal, the a/D conversion module 15 performs analog-digital conversion on the zero intermediate frequency signal to output digital IQ two-path signals, the high-order modulation and demodulation module 16 performs demodulation processing on the two-path digital signals to output demodulation codes and demodulation clock signals, the LDPC coding and decoding module 17 performs LDPC channel decoding processing by using the demodulation codes and the demodulation clock signals to recover service information, and sends the information to the baseband processing board 6 in the form of decoding clocks and decoding data.

Meanwhile, the LDPC coding and decoding module 17 performs LDPC channel coding processing by using the service clock and the service data output by the baseband processing board 6, outputs the coding clock and the coding data to the high-order modulation and demodulation module 16, then performs high-order modulation processing by the LDPC coding and decoding module, outputs a digital low-intermediate frequency signal to the D/a conversion module 19 for digital-analog conversion, and up-converts the processed analog zero-intermediate frequency signal to a 1.6GHz intermediate frequency point at the up-conversion module 18, and then sends the processed analog zero-intermediate frequency signal to the transmitter 8 for further processing.

Referring to fig. 3, the high-order modem module 16 includes a matched filter module 20, a modulation interpolation module 21, a synchronization module 22, a channel equalization module 23, a constellation mapping module 24, a frame synchronization module 25, a demodulation interpolation module 26, a baseband shaping module 27, a constellation mapping module 28, and a serial/parallel conversion module 29.

The matched filtering module 20 performs matched filtering processing on the zero intermediate frequency signal output by the a/D conversion module 15, and performs interpolation processing at the modulation interpolation module 21, the synchronization module 22 performs synchronization operations such as extracting carrier phase information from the interpolation output, the channel equalization module 23 performs LMS channel equalization on the interpolation output by using the synchronization result of the synchronization module 22, the output equalization result is demapped into constellation points by the constellation mapping module 24, the frame synchronization module 25 performs frame positioning by using the output bits of the constellation mapping module 24 to extract a frame header, and sends the frame positioning information to the LDPC coding module 17 for LDPC decoding operation.

Meanwhile, the serial/parallel conversion module 29 performs serial/parallel conversion on the coded output of the LDPC coding module 17, the two output parallel signals are mapped as constellation points at the constellation mapping module 28, the baseband forming module 27 performs baseband forming on the two digital signals, respectively, and the demodulation interpolation module 26 performs interpolation on the modulated baseband signals and sends the output low-intermediate frequency signals to the D/a conversion module 19.

Referring to fig. 4, the LDPC encoding module 17 includes a frame header detection module 30, an LDPC decoding core module 31, a decoding output buffer module 32, an encoding output buffer module 33, an LDPC encoding core module 34, and an encoding input buffer module 35.

The frame header detection module 30 processes the demodulated and demodulated clock signals output by the frame synchronization module 25 to obtain a decoding clock and soft information to be decoded, the LDPC decoding core module 31 performs decoding using the information to output a decoding clock and a decoded bit stream of hard decision, the decoding output buffer module 32 buffers the decoded bits to adjust the bit clock, and then outputs the decoding clock and decoded data to the baseband processing board 6.

Meanwhile, the service clock and the service data of the baseband processing board 6 are buffered and adjusted in code speed at the encoding input buffer module 35 and output to the LDPC encoding core module 34, the LDPC encoding core module 34 encodes the buffered service clock and the service data and outputs an encoded bit stream and an encoded clock, and the encoding output buffer module 33 performs frame header adding processing on the encoded bit stream and the encoded clock and outputs the result to the serial/parallel conversion module 29.

Referring to fig. 5, electrical tunable duplexer 10 includes a directional coupler 36, a receiver filter 37, a directional coupler 38, a frequency calibration unit 39, a driving plate 40, a stepping motor 41, a transmission mechanism 42, a directional coupler 43, a transmitter filter 44, a directional coupler 45, a frequency calibration unit 46, a driving plate 47, a stepping motor 48, a transmission mechanism 49, and a circulator 50.

The baseband processing board 6 sends out a motor control signal, and controls the stepping motor 41 and the stepping motor 48 after being driven by the driving board 40 and the driving board 47, respectively, and tunes the receiver filter 37 and the transmitter filter 44 through the transmission mechanism 49 and the transmission mechanism 42. The transmitter filter 44 is configured to filter the radio frequency signal sent by the power amplifier 9, the filtered signal is sent to the antenna 11 through the circulator 50, and the receiver filter 37 is configured to filter the antenna signal sent by the circulator 50 and send the filtered signal to the low noise amplifier 13.

The directional coupler 36, the directional coupler 38 and the frequency calibration unit 39 are arranged at the receiver filter 37 to form a feedback structure for correcting the frequency offset of the receiver filter 37; the directional coupler 43, the directional coupler 45, and the frequency calibration unit 46 are disposed at the transmitter filter 44, and constitute a feedback structure for correcting the frequency offset of the transmitter filter 44.

The device can select proper frequency points to receive and transmit data within the frequency band range of 7.1-8.5 GHz, and simultaneously, the function of receiving and transmitting high-capacity broadband wireless data of the equipment is ensured due to the adoption of the advanced channel coding and decoding technology and the high-order modulation and demodulation technology.

Claims (5)

1. An X-band wide-band large-capacity communication device comprises an indoor unit and an outdoor unit, wherein the indoor unit and the outdoor unit are connected through an optical fiber; the method is characterized in that: the indoor unit comprises a monitoring service card (1), a service card (2), a security card (3) and a first digital optical interface (4); the outdoor unit is provided with a transmitting channel and a receiving channel, the transmitting channel comprises a second digital optical interface (5), a baseband processing board card (6), a wireless broadband data conditioner (7), a transmitter (8), a power amplifier (9), an electric tuning duplexer (10) and an antenna (11) which are connected in sequence, the receiving channel comprises an antenna (11), an electric tuning duplexer (10), a low noise amplifier (13), a receiver (12), a wireless broadband data conditioner (7), a baseband processing board card (6) and a second digital optical interface (5) which are connected in sequence, and the transmitting channel and the receiving channel share the second digital optical interface (5), the baseband processing board card (6), the wireless broadband data conditioner (7), the electric tuning duplexer (10) and the antenna (11); the baseband processing board card (6) locally monitors the wireless broadband data conditioner (7), the transmitter (8), the power amplifier (9), the receiver (12), the low-noise amplifier (13) and the baseband processing board card (6); the optical fiber is connected between the first digital optical interface (4) and the second digital optical interface (5);
when data is sent, a service signal sent from the outside is encrypted through a security card (3), then synchronous auxiliary multiplexing processing is carried out on the encrypted service signal and monitoring service information sent from a monitoring service card (1) to form a combined signal, the combined signal is converted into an optical signal through a first digital optical interface (4) and then is transmitted to a second digital optical interface (5) through an optical fiber, the optical signal is converted into an electric signal through the second digital optical interface (5), the combined signal is restored and is transmitted to a baseband processing board card (6), the baseband processing board card (6) carries out auxiliary tapping processing on the combined signal, service information and monitoring information are separated out, the service information comprises a service clock and service data, wherein the monitoring information is used for carrying out parameter setting on a wireless broadband data conditioner (7), a transmitter (8), a power amplifier (9), an electric tuning duplexer (10) and a receiver (12), service information is transmitted to a wireless broadband data conditioner (7), the wireless broadband data conditioner (7) performs channel coding and high-order modulation on the service information to generate a baseband waveform suitable for microwave wireless channel transmission, then modulates the baseband waveform to a low intermediate frequency, performs digital-to-analog conversion and up-conversion operation, outputs an intermediate frequency signal to a transmitter (8), the transmitter (8) samples the intermediate frequency signal on one hand to detect intermediate frequency transmission power, and performs up-conversion processing on the intermediate frequency signal on the other hand to convert the signal frequency from the intermediate frequency to a transmission radio frequency under local monitoring setting, a power amplifier (9) amplifies the radio frequency signal output by the transmitter (8) to output power required by local monitoring, and simultaneously samples the amplified radio frequency signal to obtain radio frequency output power, and an electric-tuning duplexer (10) filters the amplified radio frequency signal, filtering out signal components outside a transmitting frequency band, and feeding the filtered signal into a microwave wireless channel by an antenna (11) for transmission;
when receiving data, the electric tuning duplexer (10) filters the radio frequency signals received by the antenna (11), filters clutter interference outside a receiving frequency band, separates out signals in the receiving frequency band, the low noise amplifier (13) amplifies the signals separated by the electric tuning duplexer (10), the receiver (12) performs down-conversion processing on the signals amplified by the low noise amplifier (13), converts the radio frequency signals in an X-band to intermediate frequency signals, the wireless broadband data conditioner (7) down-converts the intermediate frequency signals output by the receiver (12) to zero intermediate frequency, then performs analog-to-digital conversion, high-order demodulation and channel decoding processing, outputs service information, the baseband processing board card (6) performs auxiliary complex reception processing on the service information output by the wireless broadband data conditioner (7) together with local monitoring information to generate group information, the group information is converted into optical signals at the second digital optical interface (5), the optical signals are converted into electric signals by the first digital optical interface (4) and are sent to the service card (2) for tapping processing, the service information tapped by the service card (2) is decrypted by the security card (3) and is sent to the corresponding interface circuit of the service card (2) for output, and the monitoring and service information generated by tapping processing is displayed and output at the monitoring service card (1).
2. The device of claim 1, wherein the device comprises: the wireless broadband data conditioner (7) comprises a down-conversion module (14), an A/D conversion module (15), a high-order modulation and demodulation module (16), an LDPC coding and decoding module (17), an up-conversion module (18) and a D/A conversion module (19);
when data is received, a down-conversion module (14) performs down-conversion operation on an intermediate frequency signal output by a receiver (12) to output a zero intermediate frequency signal, an A/D conversion module (15) performs analog-digital conversion on the zero intermediate frequency signal to output two paths of digital IQ signals, a high-order modulation and demodulation module (16) performs demodulation processing on the two paths of digital signals to output a demodulation code and a demodulation clock signal, an LDPC coding and decoding module (17) performs LDPC channel decoding processing by using the demodulation code and the demodulation clock signal to recover service information, and sends the information to a baseband processing board card (6) in the form of a decoding clock and decoding data;
when data is sent, the LDPC coding and decoding module (17) utilizes the service clock and the service data output by the baseband processing board card (6) to perform LDPC channel coding processing, outputs the coding clock and the coding data to the high-order modulation and demodulation module (16), the high-order modulation and demodulation module (16) performs high-order modulation processing on the coding data, outputs a digital low-intermediate frequency signal to the D/A conversion module (19) to perform digital-analog conversion, and up-converts the converted analog zero-intermediate frequency signal to an intermediate frequency point at the up-conversion module (18) and then sends the intermediate frequency signal to the transmitter (8) for further processing.
3. The device according to claim 2, wherein the device comprises: the high-order modulation and demodulation module (16) comprises a matched filtering module (20), a modulation interpolation module (21), a synchronization module (22), a channel equalization module (23), a constellation diagram mapping module (24), a frame synchronization module (25), a demodulation interpolation module (26), a baseband shaping module (27), a constellation diagram mapping module (28) and a serial/parallel conversion module (29);
when receiving data, the matched filtering module (20) performs matched filtering processing on a zero intermediate frequency signal output by the A/D conversion module (15), the matched filtered signal performs interpolation processing at the modulation interpolation module (21), the synchronization module (22) extracts carrier phase information from the interpolated signal output by the modulation interpolation module (21), the channel equalization module (23) performs LMS channel equalization on the interpolated signal output by the modulation interpolation module (21) by using the carrier phase information extracted by the synchronization module (22), the output equalization result is demapped into constellation points by the constellation mapping module (24), the frame synchronization module (25) performs frame positioning by using an output bit extraction frame header of the constellation mapping module (24), and outputs a demodulated code and a demodulated clock signal, sending the frame positioning information to an LDPC coding and decoding module (17) for LDPC decoding operation;
when data is sent, a serial/parallel conversion module (29) carries out serial/parallel conversion on the encoding output of the LDPC encoding and decoding module (17), the two output parallel signals are mapped into two digital signals at a constellation mapping module (28), a baseband forming module (27) carries out baseband forming on the two digital signals respectively, a demodulation interpolation module (26) carries out interpolation operation on the baseband forming signals output by the baseband forming module (27), and the output low-intermediate frequency signals are sent to a D/A conversion module (19).
4. The device according to claim 3, wherein the device comprises: the LDPC coding and decoding module (17) comprises a frame header detection module (30), an LDPC decoding core module (31), a decoding output buffer module (32), an encoding output buffer module (33), an LDPC encoding core module (34) and an encoding input buffer module (35);
when receiving data, a frame header detection module (30) processes demodulation decoding and demodulation clock signals output by a frame synchronization module (25) to obtain a decoding clock and soft information to be decoded, an LDPC decoding core module (31) performs decoding output hard decision by using the soft information to be decoded to output a decoding bit stream, a decoding output buffer module (32) buffers the decoding bit stream, adjusts the decoding clock, outputs the bit clock, and then transmits the buffered decoding bit stream and the bit clock to a baseband processing board card (6);
when data is sent, a service clock and service data of the baseband processing board (6) are cached and code speed adjusted at a coding input buffer module (35) and output to an LDPC coding core module (34), the LDPC coding core module (34) codes the cached service clock and service data and outputs a coded bit stream and a coding clock, and a coding output buffer module (33) performs frame header adding processing on the coded bit stream and the coding clock and outputs to a serial/parallel conversion module (29).
5. The device of claim 1, wherein the device comprises: the electric-tuning duplexer (10) comprises a first directional coupler (36), a receiver filter (37), a second directional coupler (38), a first frequency correction unit (39), a first driving plate (40), a first stepping motor (41), a first transmission mechanism (42), a third directional coupler (43), a transmitter filter (44), a fourth directional coupler (45), a second frequency correction unit (46), a second driving plate (47), a second stepping motor (48), a second transmission mechanism (49) and a circulator (50);
when data is sent, the baseband processing board card (6) sends a local monitoring signal to the second driving board (47), the second driving board (47) controls the second stepping motor (48) to operate, the second stepping motor (48) tunes the transmitter filter (44) through the second transmission mechanism (49), so that a radio frequency signal sent by the power amplifier (9) is filtered, and the filtered signal is sent to the antenna (11) through the circulator (50);
when data is received, a circulator (50) separates a received signal received from an antenna (11), meanwhile, a baseband processing board card (6) sends a local monitoring signal to a first driving board (40), the first driving board (40) controls a first stepping motor (41) to operate, the first stepping motor (41) tunes a receiver filter (37) through a first transmission mechanism (42), and the receiver filter (37) filters the signal separated by the circulator (50) and sends the filtered signal to a low noise amplifier (13);
the first directional coupler (36) and the second directional coupler (38) are respectively arranged at the output end and the input end of the receiver filter (37), the first frequency calibration unit (39) collects the output signal of the receiver filter (37) through the first directional coupler (36), and performs feedback adjustment on the input of the receiver filter (37) through the second directional coupler (38) to play a role in correcting frequency offset;
the fourth directional coupler (45) and the third directional coupler (43) are respectively arranged at the output end and the input end of the transmitter filter (44), the second frequency correction unit (46) collects the output signal of the transmitter filter (44) through the fourth directional coupler (45) and performs feedback adjustment on the input of the transmitter filter (44) through the third directional coupler (43), and the effect of correcting frequency deviation is achieved.
CN201811554055.1A 2018-12-19 2018-12-19 X-band wide-band high-capacity communication device CN109495179B (en)

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