CN201467477U - Cluster optical fiber coverage system and near-end machine thereof - Google Patents
Cluster optical fiber coverage system and near-end machine thereof Download PDFInfo
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- CN201467477U CN201467477U CN200920133086XU CN200920133086U CN201467477U CN 201467477 U CN201467477 U CN 201467477U CN 200920133086X U CN200920133086X U CN 200920133086XU CN 200920133086 U CN200920133086 U CN 200920133086U CN 201467477 U CN201467477 U CN 201467477U
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Abstract
The utility model discloses a cluster optical fiber coverage system and a near-end machine thereof. The near-end machine is used for transmitting and filtering communication signals between a cluster communication base station and a far-end machine, and comprises a near-end optical module for communicating with the far-end machine and a near-end duplexer for communicating with the cluster communication base station, wherein a digital filtering device is connected between the near-end optical module and the near-end duplexer, and the digital filtering device is used for performing digital frequency selection filtering on the communication signals transmitted between the near-end optical module and the near-end duplexer by adopting a digital frequency selecting filtering technique. The cluster optical fiber coverage system and the near-end machine thereof enhance the inhibition to scatterings and interferences in a cluster signal band of the cluster optical fiber coverage system, and improve the signal coverage effect of the system, and compared with the prior analog filter technique, the system has a simple hardware structure and high reliability.
Description
Technical field
The utility model relates to communication technical field, relates in particular to a kind of cluster optical fiber covering system and near-end machine thereof.
Background technology
In the current cluster multicarrier frequency-selecting optical fiber covering system, the frequency-selective filtering of near-end machine generally all is a method of taking analog filtering, and the filtering of intermediate frequency is finished by Surface Acoustic Wave Filter or crystal filter.Because the smaller bandwidth of cluster signal is generally 25kHz, it is limit by the performance of filter device, adopts the analog filtering effect undesirable, causes the spuious and interference in the signal band bigger, influences covering effect of signals.In addition, for multi-carrier signal, system must all carry out frequency-selective filtering by corresponding module separately to each carrier wave and handle, because the analog filtering employing is hardware configuration entirely, so just causes the system hardware structure complexity, and reliability reduces.
And the employing analog filter, each carrier wave for multi-carrier signal all need set in advance center frequency point, and frequency can not be changed after system design was finished, and was unfavorable for system upgrade and expanded application.
Therefore, prior art is still waiting to improve and improve.
The utility model content
The purpose of this utility model is, above-mentioned shortcoming at prior art, provide a kind of and can strengthen, improve the trunked communication system covering effect of signals, strengthened the cluster optical fiber covering system and the near-end machine thereof of the scope of application and the autgmentability of system inhibition spuious in the cluster signal band and that disturb.
Technical solutions of the utility model are:
A kind of near-end machine of cluster optical fiber covering system, be used for the signal of communication between trunking communication base station and the remote termination is transmitted and Filtering Processing, comprise and be used for the near-end optical module of communicating by letter and be used for near-end duplexer with described trunking communication base station communication with described remote termination; Wherein,
Be connected with digital filter apparatus between described near-end optical module and the near-end duplexer, described digital filter apparatus is used to adopt the digital filtering frequency-selecting technology, and transmission communication signal between described near-end optical module and the near-end duplexer is carried out the digital frequency-selecting Filtering Processing.
Near-end machine described in the utility model, wherein, described digital filter apparatus comprises up analog down module, up simulation up-conversion module and the uplink baseband signal processing module that connects successively; Wherein,
Described up analog down module connects described near-end optical module, and described up simulation up-conversion module connects described near-end duplexer;
Described up analog down module is used to receive the upward signal from described near-end optical module, and described upward signal is converted to analog if signal;
Described uplink baseband signal processing module is used for described analog if signal is carried out the digital frequency-selecting Filtering Processing;
Described up simulation up-conversion module after being used for the analog if signal after the Filtering Processing carried out up-conversion, sends to described near-end duplexer.
Near-end machine described in the utility model, wherein, described digital filter apparatus also comprises descending analog down module, descending simulation up-conversion module and the downgoing baseband signal processing module that connects successively; Wherein,
Described descending analog down module connects described near-end duplexer, and described descending simulation up-conversion module connects described near-end optical module;
Described descending analog down module is used to receive the downstream signal from described near-end duplexer, and described downstream signal is converted to analog if signal;
Described downgoing baseband signal processing module is used for described analog if signal is carried out the digital frequency-selecting Filtering Processing;
Described descending simulation up-conversion module after being used for the analog if signal after the Filtering Processing carried out up-conversion, sends to described near-end optical module.
Near-end machine described in the utility model, wherein, described uplink baseband signal processing module comprises A/D converting unit, Digital Down Convert unit, digital filtering unit, Digital Up Convert unit and the D/A converting unit that connects successively, wherein,
Described A/D converting unit is used to receive the analog if signal that described up analog down module is exported, and described analog if signal is converted to digital medium-frequency signal;
Described Digital Down Convert unit is used for described digital medium-frequency signal is converted to digital baseband signal, and sends to described digital filtering unit;
Described digital filtering unit is used for described digital baseband signal is carried out the digital frequency-selecting Filtering Processing;
Described Digital Up Convert unit is used for converting filtered digital baseband signal to digital medium-frequency signal;
Described D/A converting unit is used for described digital medium-frequency signal is converted to analog if signal, and sends to described up simulation up-conversion module.
Near-end machine described in the utility model, wherein, described downgoing baseband signal processing module comprises A/D converting unit, Digital Down Convert unit, digital filtering unit, Digital Up Convert unit and the D/A converting unit that connects successively, wherein,
Described A/D converting unit is used to receive the analog if signal that described descending analog down module is exported, and described analog if signal is converted to digital medium-frequency signal;
Described Digital Down Convert unit is used for described digital medium-frequency signal is converted to digital baseband signal, and sends to described digital filtering unit;
Described digital filtering unit is used for described digital baseband signal is carried out the digital frequency-selecting Filtering Processing;
Described Digital Up Convert unit is used for converting filtered digital baseband signal to digital medium-frequency signal;
Described D/A converting unit is used for described digital medium-frequency signal is converted to analog if signal, and sends to described descending simulation up-conversion module.
A kind of cluster optical fiber covering system comprises trunking communication base station and remote termination, wherein, also comprises near-end machine as previously described, is used for the signal of communication between described trunking communication base station and the remote termination is transmitted and the digital frequency-selecting Filtering Processing.
Cluster optical fiber covering system described in the utility model, wherein, described remote termination comprises:
The antenna that is used for the uplink communication signal of telecommunication of receiving terminal;
Be used to transmit the reception far-end duplexer of the uplink communication signal of telecommunication that is received;
Be used for the described uplink communication signal of telecommunication is carried out the ascending power amplifier of processing and amplifying;
With the downlink power amplifier that is used for the downlink communication signal of telecommunication is carried out processing and amplifying;
And the far-end optical module that connects the near-end machine by fiber optic network; Wherein,
Described ascending power amplifier and downlink power amplifier are the multicarrier linear power amplifier.
The utility model carries out digital filtering by adopting Digital Signal Processing to the trunking communication signal, its filter effect is better, strengthened inhibition spuious in the cluster signal band and that disturb, improved the trunked communication system covering effect of signals. and can adopt software to realize the frequency-selective filtering processing of each carrier wave of multi-carrier signal, the center frequency point of each carrier wave can be provided with arbitrarily by software, strengthened the scope of application and the autgmentability of optical fiber covering system greatly, and system configuration is simple, the reliability height.
Description of drawings
Fig. 1 is the cluster optical fiber covering system structured flowchart of the utility model embodiment;
Fig. 2 is the detailed block diagram of the cluster optical fiber covering system near-end machine of the utility model embodiment;
Fig. 3 is the base band processor module structured flowchart of the near-end machine of the utility model embodiment.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, clear and definite, below the utility model is further described with reference to the accompanying drawing embodiment that develops simultaneously.
The cluster optical fiber covering system near-end machine that present embodiment provided, with the syndeton block diagram of trunking communication base station and remote termination as shown in Figure 1, wherein, near-end machine 200 is used for the signal of communication between trunking communication base station 100 and the remote termination 300 is transmitted and Filtering Processing, and it comprises near-end optical module 230 and near-end duplexer 210.Wherein, near-end optical module 230 is used for communicating by letter with remote termination 300, and near-end duplexer 210 is used for communicating by letter with trunking communication base station 100.Between near-end optical module 230 and near-end duplexer 210, be connected with digital filter apparatus 220, this digital filter apparatus 220 adopts digital filtering technique, and the trunking communication signal between near-end optical module 230 and the near-end duplexer 210 is carried out the digital frequency-selecting Filtering Processing.
The near-end duplexer 210 of present embodiment can be alien frequencies duplex radio station, and its effect is that the signal that transmits and receives is isolated, and guaranteeing to receive and launch can both the while operate as normal.The digital frequency-selecting filtering technique is meant, by the intermediate-freuqncy signal of cluster signal being carried out processes such as analog-to-digital conversion, Digital Down Convert, digital filtering processing, Digital Up Convert, digital-to-analogue conversion, finishes the digital filtering to intermediate-freuqncy signal.Because the smaller bandwidth of cluster signal adopts Digital Signal Processing filtering more accurate, to reach better filter effect.
In the present embodiment, cluster optical fiber covering system near-end machine detailed block diagram as shown in Figure 2, wherein digital filter apparatus 220 comprises downstream signal passage and upward signal passage.The upward signal passage is used to transmit also filtering by the downstream signal of near-end duplexer 210 to near-end optical module 230.The downstream signal passage is used to transmit also filtering by the upward signal of near-end optical module 230 to described near-end duplexer 210.Upward signal passage and downstream signal passage are that the near-end machine of general cluster optical fiber covering system all has, its difference is, comprised respectively in the upward signal passage of present embodiment and the downstream signal, be used to carry out the uplink baseband signal processing module 225 and the downgoing baseband signal processing module 222 of digital filtering.Owing to adopted digital filtering, it has strengthened inhibition spuious in the cluster signal band and that disturb, and has improved the trunked communication system covering effect of signals.
Wherein, the upward signal passage comprises: the up analog down module 224 of Lian Jieing, up simulation up-conversion module 226 and uplink baseband signal processing module 225 successively, as shown in Figure 2.Up analog down module 224 connects near-end optical module 230, and up simulation up-conversion module 226 connects near-end duplexer 210.Wherein, up analog down module 224 is used to receive the upward signal that near-end optical module 230 sends, and upward signal is converted to analog if signal.Uplink baseband signal processing module 225 is used for analog if signal is carried out Filtering Processing, and the analog if signal after the Filtering Processing is sent to up simulation up-conversion module 226.Up simulation up-conversion module 226 after being used for the analog if signal after the Filtering Processing is transformed to the radiofrequency signal of communication needs, sends to near-end duplexer 210.Because uplink baseband signal processing module 225 has adopted digital filtering, it can strengthen inhibition spuious in the up cluster signal band and that disturb, improves up trunked communication system covering effect of signals.
The downstream signal passage comprises: the descending analog down module 221 of Lian Jieing, descending simulation up-conversion module 223 and downgoing baseband signal processing module 222 successively, as shown in Figure 2.Descending analog down module 221 connects near-end duplexer 210, and descending simulation up-conversion module 223 connects near-end optical module 230.Wherein, descending analog down module 221 is used to receive the downstream signal that near-end duplexer 210 sends, and downstream signal is converted to analog if signal.Downgoing baseband signal processing module 222 is used for analog if signal is carried out the digital frequency-selecting Filtering Processing.Descending simulation up-conversion module 223 after being used for the analog if signal after the Filtering Processing is transformed to the radiofrequency signal of communication needs, sends to near-end optical module 230.Equally, because downgoing baseband signal processing module 222 has adopted digital filtering technique, it can strengthen inhibition spuious in the descending cluster signal band and that disturb, improves descending trunked communication system covering effect of signals.
Uplink baseband signal processing module 225 and downgoing baseband signal processing module 222 have same structure, include the A/D converting unit 401, Digital Down Convert unit 402, digital filtering unit 403, Digital Up Convert unit 404 and the D/A converting unit 405 that connect successively, as shown in Figure 3.A/D converting unit 401 is used to receive the analog if signal of described up analog down module 221 or 226 outputs of descending analog down module, and analog if signal is converted to digital medium-frequency signal.Digital Down Convert unit 402, be used to receive the digital medium-frequency signal of A/D converting unit 401 outputs, and digital medium-frequency signal is converted to digital baseband signal, and reduce signal rate, to reach better coverage effect, again digital baseband signal is sent to digital filtering unit 403.Digital filtering unit 403 is used for digital baseband signal is carried out the digital frequency-selecting Filtering Processing, and filtered digital baseband signal is sent to Digital Up Convert unit 404.Digital Up Convert unit 404 is used for converting filtered digital baseband signal to digital medium-frequency signal, and sends to D/A converting unit 405.D/A converting unit 405 is used for the digital medium-frequency signal of Digital Up Convert unit 404 outputs is converted to analog if signal, and sends to up simulation up-conversion module 224 or descending simulation up-conversion module 223.By adopting digital filtering technique, strengthened inhibition spuious in the cluster signal band and that disturb, improved the trunked communication system covering effect of signals.
Between digital filter apparatus in the present embodiment and the near-end duplexer, and all amplifier can be set as required between digital filter apparatus and the near-end optical module, as shown in Figure 2, to carry out the laggard line number word select of processing and amplifying Filtering Processing frequently for the weak radio-frequency signal that receives, and will after the weak radiofrequency signal after the digital frequency-selecting Filtering Processing is amplified, send to the point of destination, to improve signal stabilization.
In addition, for multi-carrier signal, it all is partly to finish in base band signal process that the frequency-selective filtering of each carrier wave is handled, all can adopt software programming to realize, have only a digital signal processor (DSP) or chip to get final product on the hardware, therefore the center frequency point of each carrier wave can be provided with arbitrarily by software, has strengthened the scope of application and the autgmentability of system greatly.Relative analog filtering technology before this, system hardware structure is simpler, the reliability height.
The utility model also provides a kind of cluster optical fiber covering system, comprise trunking communication base station and remote termination, also comprise the described near-end machine of each embodiment of front, the near-end machine connects trunking communication base station and remote termination, adopts fiber optic network to communicate by letter between near-end machine and the remote termination.
Remote termination in the cluster optical fiber covering system of present embodiment is provided with antenna, the uplink communication signal of telecommunication that is used for receiving terminal, also be provided with far-end duplexer 302 and modules such as amplification, noise processed in the remote termination, and far-end optical module 301, as shown in Figure 3, be used for finishing the signal processing of remote termination.Wherein amplifier comprises downlink power amplifier 303 and ascending power amplifier 304, all adopt multicarrier linear power amplifier (MCPA), and adopt feedforward or digital pre-distortion technology to finish power amplification, otherwise, can't satisfy index request during multicarrier as adopting traditional power amplifier.
The near-end machine detailed structure view of present embodiment as shown in Figure 3, the functional description of its each module and unit is no longer described at this, can be referring to the embodiment of front. the near-end machine is mainly used in the signal of communication between trunking communication base station and the remote termination is transmitted and Filtering Processing. have the near-end machine of digital frequency-selecting filter function by employing, cluster multi-carrier signal to cluster optical fiber covering system carries out Filtering Processing, reduce the spuious and interference in the signal band, make the covering effect of signals of whole optical fiber covering system better.
The utility model carries out digital filtering by adopting Digital Signal Processing to the trunking communication signal, and its filter effect is better, has strengthened inhibition spuious in the cluster signal band and that disturb, has improved the trunked communication system covering effect of signals.And can adopt software to realize the frequency-selective filtering processing of each carrier wave of multi-carrier signal, the center frequency point of each carrier wave can be provided with arbitrarily by software, strengthened the scope of application and the autgmentability of optical fiber covering system greatly, and system configuration is simple, the reliability height.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection range of the utility model claims.
Claims (7)
1. the near-end machine of a cluster optical fiber covering system, be used for the signal of communication between trunking communication base station and the remote termination is transmitted and Filtering Processing, comprise and be used for the near-end optical module of communicating by letter and be used for near-end duplexer with described trunking communication base station communication with described remote termination; It is characterized in that,
Be connected with digital filter apparatus between described near-end optical module and the near-end duplexer, described digital filter apparatus is used to adopt the digital frequency-selecting filtering technique, and transmission communication signal between described near-end optical module and the near-end duplexer is carried out the digital frequency-selecting Filtering Processing.
2. near-end machine as claimed in claim 1 is characterized in that, described digital filter apparatus comprises up analog down module, up simulation up-conversion module and the uplink baseband signal processing module that connects successively; Wherein,
Described up analog down module connects described near-end optical module, and described up simulation up-conversion module connects described near-end duplexer;
Described up analog down module is used to receive the upward signal from described near-end optical module, and described upward signal is converted to analog if signal;
Described uplink baseband signal processing module is used for described analog if signal is carried out the digital frequency-selecting Filtering Processing;
Described up simulation up-conversion module after being used for the analog if signal after the Filtering Processing carried out up-conversion, sends to described near-end duplexer.
3. near-end machine as claimed in claim 1 or 2 is characterized in that, described digital filter apparatus also comprises descending analog down module, descending simulation up-conversion module and the downgoing baseband signal processing module that connects successively; Wherein,
Described descending analog down module connects described near-end duplexer, and described descending simulation up-conversion module connects described near-end optical module;
Described descending analog down module is used to receive the downstream signal from described near-end duplexer, and described downstream signal is converted to analog if signal;
Described downgoing baseband signal processing module is used for described analog if signal is carried out the digital frequency-selecting Filtering Processing;
Described descending simulation up-conversion module after being used for the analog if signal after the Filtering Processing carried out up-conversion, sends to described near-end optical module.
4. near-end machine as claimed in claim 2 is characterized in that, described uplink baseband signal processing module comprises A/D converting unit, Digital Down Convert unit, digital filtering unit, Digital Up Convert unit and the D/A converting unit that connects successively, wherein,
Described A/D converting unit is used to receive the analog if signal that described up analog down module is exported, and described analog if signal is converted to digital medium-frequency signal;
Described Digital Down Convert unit is used for described digital medium-frequency signal is converted to digital baseband signal, and sends to described digital filtering unit;
Described digital filtering unit is used for described digital baseband signal is carried out the digital frequency-selecting Filtering Processing;
Described Digital Up Convert unit is used for converting filtered digital baseband signal to digital medium-frequency signal;
Described D/A converting unit is used for described digital medium-frequency signal is converted to analog if signal, and sends to described up simulation up-conversion module.
5. near-end machine as claimed in claim 3 is characterized in that, described downgoing baseband signal processing module comprises A/D converting unit, Digital Down Convert unit, digital filtering unit, Digital Up Convert unit and the D/A converting unit that connects successively, wherein,
Described A/D converting unit is used to receive the analog if signal that described descending analog down module is exported, and described analog if signal is converted to digital medium-frequency signal;
Described Digital Down Convert unit is used for described digital medium-frequency signal is converted to digital baseband signal, and sends to described digital filtering unit;
Described digital filtering unit is used for described digital baseband signal is carried out the digital frequency-selecting Filtering Processing;
Described Digital Up Convert unit is used for converting filtered digital baseband signal to digital medium-frequency signal;
Described D/A converting unit is used for described digital medium-frequency signal is converted to analog if signal, and sends to described descending simulation up-conversion module.
6. cluster optical fiber covering system, comprise trunking communication base station and remote termination, it is characterized in that, be connected with near-end machine as claimed in claim 1 between described trunking communication base station and the remote termination, be used for the signal of communication between described trunking communication base station and the remote termination is transmitted and the digital frequency-selecting Filtering Processing.
7. cluster optical fiber covering system as claimed in claim 6 is characterized in that described remote termination comprises:
The antenna that is used for the uplink communication signal of telecommunication of receiving terminal;
Be used to transmit the reception far-end duplexer of the uplink communication signal of telecommunication that is received;
Be used for the described uplink communication signal of telecommunication is carried out the ascending power amplifier of processing and amplifying;
With the downlink power amplifier that is used for the downlink communication signal of telecommunication is carried out processing and amplifying;
And the far-end optical module that connects the near-end machine by fiber optic network; Wherein,
Described ascending power amplifier and downlink power amplifier are the multicarrier linear power amplifier.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200920133086XU CN201467477U (en) | 2009-06-26 | 2009-06-26 | Cluster optical fiber coverage system and near-end machine thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200920133086XU CN201467477U (en) | 2009-06-26 | 2009-06-26 | Cluster optical fiber coverage system and near-end machine thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101969331A (en) * | 2010-05-27 | 2011-02-09 | 福建京奥通信技术有限公司 | Digital frequency selecting method for solving resource consumption |
| CN102833766A (en) * | 2012-08-02 | 2012-12-19 | 奥维通信股份有限公司 | System and method for locking base station based on CDMA 2000 continuous carriers |
| CN103220687A (en) * | 2013-04-11 | 2013-07-24 | 四川邮科通信技术有限公司 | Multi-standard type category 5 cable home-entry covering system |
| CN107294609A (en) * | 2017-07-19 | 2017-10-24 | 泉州泽仕通科技有限公司 | Wideband digital cluster optical fiber coverage system |
-
2009
- 2009-06-26 CN CN200920133086XU patent/CN201467477U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101969331A (en) * | 2010-05-27 | 2011-02-09 | 福建京奥通信技术有限公司 | Digital frequency selecting method for solving resource consumption |
| CN102833766A (en) * | 2012-08-02 | 2012-12-19 | 奥维通信股份有限公司 | System and method for locking base station based on CDMA 2000 continuous carriers |
| CN103220687A (en) * | 2013-04-11 | 2013-07-24 | 四川邮科通信技术有限公司 | Multi-standard type category 5 cable home-entry covering system |
| CN107294609A (en) * | 2017-07-19 | 2017-10-24 | 泉州泽仕通科技有限公司 | Wideband digital cluster optical fiber coverage system |
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Granted publication date: 20100512 Termination date: 20160626 |