CN204967810U - Frequency selective device of ARC digit intercom system - Google Patents
Frequency selective device of ARC digit intercom system Download PDFInfo
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- CN204967810U CN204967810U CN201520712689.0U CN201520712689U CN204967810U CN 204967810 U CN204967810 U CN 204967810U CN 201520712689 U CN201520712689 U CN 201520712689U CN 204967810 U CN204967810 U CN 204967810U
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Abstract
The utility model relates to a communication system provides a ARC digit intercom system frequency selective device, including first first detector, analog -to -digital conversion module, digital intermediate frequency module, digital analog conversion module, second first detector, local oscillator circuit, little the control unit, power module, clock module and RS485 interface circuit, digit intermediate frequency module is FPGA digit intermediate frequency module, numeral intermediate frequency module under by the numeral frequency conversion module, baseband signal processing module and numerically frequency conversion module constitute, little the control unit is connected with digital intermediate frequency module and is during digital intermediate frequency module provides required filter factor and deposit digital intermediate frequency module, RS485 interface circuit is connected with little the control unit, the local oscillator circuit is first first detector respectively and the second first detector provides the local oscillator signal, the clock module provides the required clock of stabilizing for each module of device, power module provides steady voltage DC power supply for each module.
Description
Technical field
The utility model relates to communication system, particularly a kind of frequency selective device of ARC digital intecommunication system.
Background technology
The establishment of ARC technical standard and use will will produce huge positive role to Chinese wireless private network (intercom) industry development.ARC technology repeater is a kind of a kind of radio transmission transferring equipment played in wireless communication transmissions process signal enhancing, it have compared with base station structure simple, invest the advantages such as less and easy for installation, the blind area and weak district that are difficult to cover can be widely used in, for improving communication quality, solve the problems such as call drop.And digital frequency-selecting device can be used in various ARC technology digital high-frequency amplification station, be especially applied in the digital high-frequency amplification station in the intensive complex wireless environments in the base station such as urban district or county town.Because frequency is seriously polluted, traditional broad band repeater is inapplicable.And adopt the digital high-frequency amplification station of digital frequency-selecting device selectively can amplify main website wireless signal, reduce Intermodulation Interference and noise level, thus greatly improve the performance of repeater.With reference to Figure of description 1 repeater in the downlink, the wireless signal received by donor antenna is after duplexer and low noise amplifier (LNA), enter digital frequency-selecting device, power amplifier (PA) is used to amplify the signal selected afterwards, and launched by retransmitting antenna, thus realize the covering to weak signal area; The principle of up link is similar, and in uplink path, the signal of the travelling carriage mobile phone in overlay area is transmitted into corresponding base station with same working method by after up amplification link processing, thus reaches the signal transmission of base station and mobile phone.And the frequency-selector in repeater is used for selecting the carrier wave needed for system, its principle utilizes one group of arrowband frequency-selecting filter, only the signal of required frequency is selected, out-of-band noise is then played to the effect of filtration, thus achieve digital frequency-selecting function.The selection of frequency-selector is most important, directly affects the performance of whole repeater.
Wireless frequency selecting device in existing ARC technology repeater mostly adopts the mode of intermediate frequency filtering, realize aspect and mostly adopt simulation frequency-selecting equipment, the selection of channel is completed by SAW (Surface Acoustic Wave) filter, one road carrier wave needs a filter, for the filter of the simulation of multichannel carrier, need multiple SAW (Surface Acoustic Wave) filter to realize, owing to being analog machine, consistency and the extensibility of device are poor, be unfavorable for debugging and batch production, and the use of multiple filter will cause the decline of the performance index such as cost, volume, power consumption of system.In addition, some digital filters occurred in the market, the monolithic carrier number provided is also limited, and the digital high-frequency amplification station on market has the demand of 12,16 railway digital intermediate-frequency filters, meet this demand, just needs multiple hardware to support.This also will cause device structure complicated, function reduction, and cost raises.
Utility model content
Therefore, for above-mentioned problem, the utility model proposes a kind ARC digital handset system frequency selective device, this device is by digitlization means, signal transacting is carried out to realize frequency-selecting function at numeric field, and can according to the different demands of network, required carrier number is provided, substantially increase flexibility and the extensibility of ARC digital handset system, the simultaneously cost reducing ARC digital handset system, volume and power consumption at double, shorten product development cycle, reduce test and production cost.
For solving this technical problem, the utility model takes following scheme: a kind of ARC digital intecommunication system frequency selective device, comprise the first frequency mixer, analog-to-digital conversion module, data intermediate frequency module, D/A converter module, second frequency mixer, local oscillation circuit, micro-control unit, power module, clock module and RS485 interface circuit, described data intermediate frequency module is FPGA data intermediate frequency module, described data intermediate frequency module is by Digital Down Converter Module, baseband signal processing module and Digital Up Convert module composition, described micro-control unit is connected with data intermediate frequency module to be provided required filter factor for data intermediate frequency module and is stored in data intermediate frequency module, described RS485 interface circuit is connected with micro-control unit, described local oscillation circuit is respectively the first frequency mixer and the second frequency mixer provides local oscillation signal, described clock module provides required stabilizing clock for each module of device, described power module provides constant voltage dc source for each module,
Described first frequency mixer received RF signal converts radiofrequency signal to intermediate-freuqncy signal in conjunction with local oscillation circuit to carry out sampling and digitized processing again, and the signal after mixing is sampled by analog-to-digital conversion module, the digital signal changed after sampling is sent into the Digital Down Converter Module process of data intermediate frequency module by described analog-to-digital conversion module, by Digital Down Converter Module, this digital signal is carried out process in conjunction with carrier signal and obtain digital baseband signal, this digital baseband signal carries out sending into Digital Up Convert module after gain-adjusted process through baseband signal processing module, described Digital Up Convert module converts this digital baseband signal to digital medium-frequency signal and forms multicarrier via carrier wave accumulator module and completes frequency-selecting output digital medium-frequency signal, described D/A converter module sends into the second frequency mixer after this digital medium-frequency signal is converted to analog signal, second frequency mixer is launched after this analog signal is carried out being mixed to radio-frequency transmissions frequency range.
Further improvement, described Digital Down Converter Module comprises NOC digital controlled oscillator generation module, frequency overlapped-resistable filter and abstraction module, namely receiving from the digital signal of analog-to-digital conversion module and carrying out digital mixing by the carrier signal of NOC digital controlled oscillator generation module generation, each carrier signal is made up of I road and Q road signal, again this mixed frequency signal is moved to zero-frequency, after frequency overlapped-resistable filter filtering, carry out D times of factor extraction reduction data rate by abstraction module obtain digital baseband signal.
Further improvement, described Digital Up Convert module comprises interpose module, mirror image filtration module, digital mixing module and carrier wave accumulator module, receive and in interpose module, become from the digital baseband signal after baseband signal processing module process the signal meeting nyquist sampling rate, send into mirror image filtration module elimination image component again, corresponding to Digital Down Converter Module, by digital mixing module, signal is moved to intermediate frequency formation digital medium-frequency signal again, then this digital medium-frequency signal forms multicarrier via carrier wave accumulator module and completes frequency-selecting output digital medium-frequency signal.
By adopting preceding solution, the beneficial effects of the utility model are:
(1) by realizing digital frequency-selecting function in the process of numeric field to signal, improve precision and the consistency of signal transacting, owing to have employed digital frequency-selecting technology, the extensibility of system is greatly enhanced, and this device can provide required carrier number easily according to the demand of network;
(2) programmable modules such as FPGA are adopted due to data intermediate frequency module, improve the integrated level of system, shorten the R&D cycle, flexibility and autgmentability have also been obtained large increase, enormously simplify the structure of system simultaneously, meet product progressively to the trend of low-power consumption, miniaturization, miniaturization, have and be convenient to feature such as debugging production in enormous quantities etc.; Device power consumption is low, and the green of response country reduces discharging environmental requirement;
(3) owing to being the thought based on software radio, through simple software upgrading, frequency selective device of the present utility model can be applied in Tetra and DMR system very easily, the frequency-selecting function of 16 channels can be provided at most, can according to network capacity by RS-485 interface circuit download configuration during application.
Accompanying drawing explanation
Fig. 1 is the application block diagram of frequency selective device in repeater in prior art;
Fig. 2 is the theory diagram of the utility model embodiment;
Fig. 3 is the operation logic figure of data intermediate frequency module in the utility model embodiment.
Embodiment
Now with embodiment, the utility model is further illustrated by reference to the accompanying drawings.
Referring to figs. 2 and 3, ARC digital intecommunication system frequency selective device of the present utility model, comprises the first frequency mixer 1, analog-to-digital conversion module 2, data intermediate frequency module 3, D/A converter module 4, second frequency mixer 5, local oscillation circuit 6, micro-control unit (being called for short MCU) 7, power module, clock module and RS485 interface circuit 8, described data intermediate frequency module 3 is FPGA data intermediate frequency module, and described data intermediate frequency module 3 is by Digital Down Converter Module, baseband signal processing module and Digital Up Convert module composition, described Digital Down Converter Module comprises NOC digital controlled oscillator generation module, frequency overlapped-resistable filter and abstraction module, described Digital Up Convert module comprises interpose module, mirror image filtration module, digital mixing module and carrier wave accumulator module, described micro-control unit 7 is connected with data intermediate frequency module 3 to be provided required filter factor for data intermediate frequency module 3 and is stored in data intermediate frequency module 3, described RS485 interface circuit 8 is connected with micro-control unit 7, described local oscillation circuit 6 is respectively the first frequency mixer 1 and the second frequency mixer 5 provides local oscillation signal, and described clock module is the first frequency mixer 1 of frequency selective device, analog-to-digital conversion module 2, data intermediate frequency module 3, D/A converter module 4, second frequency mixer 5, local oscillation circuit 6, each modules such as micro-control unit 7 provide required stabilizing clock, and described power module provides constant voltage dc source for each module,
Described first frequency mixer 1 received RF signal converts radiofrequency signal to intermediate-freuqncy signal in conjunction with the local oscillation signal that local oscillation circuit 6 sends to carry out sampling and digitized processing again, and the signal after mixing is sampled by analog-to-digital conversion module 2; the digital signal changed after sampling is sent into the Digital Down Converter Module process of data intermediate frequency module 3 by described analog-to-digital conversion module 2, by Digital Down Converter Module, this digital signal is carried out process in conjunction with carrier signal and obtain digital baseband signal, namely receiving from the digital signal of analog-to-digital conversion module 2 and carrying out digital mixing by the carrier signal of NOC digital controlled oscillator generation module generation, each carrier signal is made up of I road and Q road signal, again this mixed frequency signal is moved to zero-frequency, after frequency overlapped-resistable filter filtering, carry out D times of factor extraction reduction data rate by abstraction module obtain digital baseband signal, again this digital baseband signal is carried out sending into Digital Up Convert module after gain-adjusted process through baseband signal processing module, described Digital Up Convert module converts this digital baseband signal to digital medium-frequency signal and forms multicarrier via carrier wave accumulator module and completes frequency-selecting output digital medium-frequency signal, i.e. Digital Up Convert module receives and in interpose module, becomes from the digital baseband signal after baseband signal processing module process the signal meeting nyquist sampling rate, send into mirror image filtration module elimination image component again, corresponding to Digital Down Converter Module, by digital mixing module, signal is moved to intermediate frequency formation digital medium-frequency signal again, then this digital medium-frequency signal forms multicarrier via carrier wave accumulator module and completes frequency-selecting output digital medium-frequency signal, described D/A converter module 4 sends into the second frequency mixer 5 after this digital medium-frequency signal is converted to analog signal, second frequency mixer 5 is launched after this analog signal is carried out being mixed to radio-frequency transmissions frequency range.
The wherein function of micro-control unit realization, configure FPGA program and filter parameter is managed, be utilize MCU to read in FPGA data intermediate frequency module by the coefficient in PC in the present system, therefore the FPGA program of upgrading or change FPGA data intermediate frequency module is convenient.If change the program in existing system, only need by management system, the configurator after changing is configured FPGA program by MCU.The utility model can provide at most the frequency-selecting function of 16 channels, can according to network capacity by port download configuration such as RS-485 interface circuits during application.
The utility model is by indoor distribution application the utility model, employing multifrequency, multimode compatible technique carry out compatible operations in conjunction with mounted other indoor distributed system (as PDT, ARC), present networks is made to optimize existing PDT digital cluster system base station coverage not enough, expanding the signal cover of base station, is the extremely effective equipment of one of filling coverage hole; Superior effect of the present utility model is that method for designing is simple simultaneously, is easy to realize, is convenient to batch production and reduces costs; And network optimization equipment of the present utility model, because employing diffraction is better, do relay transmission by the frequency range that external environment is little, makes transmission range farther.
Although specifically show in conjunction with preferred embodiment and describe the utility model; but those skilled in the art should be understood that; not departing from the spirit and scope of the present utility model that appended claims limits; can make a variety of changes the utility model in the form and details, be protection range of the present utility model.
Claims (3)
1. an ARC digital intecommunication system frequency selective device, it is characterized in that: comprise the first frequency mixer, analog-to-digital conversion module, data intermediate frequency module, D/A converter module, second frequency mixer, local oscillation circuit, micro-control unit, power module, clock module and RS485 interface circuit, described data intermediate frequency module is FPGA data intermediate frequency module, described data intermediate frequency module is by Digital Down Converter Module, baseband signal processing module and Digital Up Convert module composition, described micro-control unit is connected with data intermediate frequency module to be provided required filter factor for data intermediate frequency module and is stored in data intermediate frequency module, described RS485 interface circuit is connected with micro-control unit, described local oscillation circuit is respectively the first frequency mixer and the second frequency mixer provides local oscillation signal, described clock module provides required stabilizing clock for each module of device, described power module provides constant voltage dc source for each module,
Described first frequency mixer received RF signal converts radiofrequency signal to intermediate-freuqncy signal in conjunction with local oscillation circuit to carry out sampling and digitized processing again, and the signal after mixing is sampled by analog-to-digital conversion module, the digital signal changed after sampling is sent into the Digital Down Converter Module process of data intermediate frequency module by described analog-to-digital conversion module, by Digital Down Converter Module, this digital signal is carried out process in conjunction with carrier signal and obtain digital baseband signal, this digital baseband signal carries out sending into Digital Up Convert module after gain-adjusted process through baseband signal processing module, described Digital Up Convert module converts this digital baseband signal to digital medium-frequency signal and forms multicarrier via carrier wave accumulator module and completes frequency-selecting output digital medium-frequency signal, described D/A converter module sends into the second frequency mixer after this digital medium-frequency signal is converted to analog signal, second frequency mixer is launched after this analog signal is carried out being mixed to radio-frequency transmissions frequency range.
2. ARC digital intecommunication system frequency selective device according to claim 1, it is characterized in that: described Digital Down Converter Module comprises NOC digital controlled oscillator generation module, frequency overlapped-resistable filter and abstraction module, namely receiving from the digital signal of analog-to-digital conversion module and carrying out digital mixing by the carrier signal of NOC digital controlled oscillator generation module generation, each carrier signal is made up of I road and Q road signal, again this mixed frequency signal is moved to zero-frequency, after frequency overlapped-resistable filter filtering, carry out D times of factor extraction reduction data rate by abstraction module obtain digital baseband signal.
3. ARC digital intecommunication system frequency selective device according to claim 1, it is characterized in that: described Digital Up Convert module comprises interpose module, mirror image filtration module, digital mixing module and carrier wave accumulator module, receive and in interpose module, become from the digital baseband signal after baseband signal processing module process the signal meeting nyquist sampling rate, send into mirror image filtration module elimination image component again, corresponding to Digital Down Converter Module, by digital mixing module, signal is moved to intermediate frequency formation digital medium-frequency signal again, then this digital medium-frequency signal forms multicarrier via carrier wave accumulator module and completes frequency-selecting output digital medium-frequency signal.
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| CN201520712689.0U CN204967810U (en) | 2015-09-15 | 2015-09-15 | Frequency selective device of ARC digit intercom system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119628A (en) * | 2015-09-15 | 2015-12-02 | 福建联拓科技有限公司 | Frequency-selecting device of ARC digital intercom system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119628A (en) * | 2015-09-15 | 2015-12-02 | 福建联拓科技有限公司 | Frequency-selecting device of ARC digital intercom system |
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Granted publication date: 20160113 Termination date: 20180915 |