CN202587393U - Device for realizing multi-frequency broadband high-speed digital distributed antenna system (DAS) - Google Patents
Device for realizing multi-frequency broadband high-speed digital distributed antenna system (DAS) Download PDFInfo
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- CN202587393U CN202587393U CN 201220131201 CN201220131201U CN202587393U CN 202587393 U CN202587393 U CN 202587393U CN 201220131201 CN201220131201 CN 201220131201 CN 201220131201 U CN201220131201 U CN 201220131201U CN 202587393 U CN202587393 U CN 202587393U
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Abstract
The utility model discloses a device for realizing a multi-frequency broadband high-speed digital distributed antenna system (DAS). The device comprises a near terminal machine and at least one remote terminal machine connected with the near terminal machine, wherein output ends of the preset N radio frequency modules of the near terminal machine inside the near terminal machine are connected with the input end of the digital processor of the near terminal machine through corresponding N mixers; the output end of the digital processor of the near terminal machine is connected with the input ports of the remote terminal machines; the input ends of the digital processors of the remote terminal machines are connected with the output ports of the near terminal machine; the output ends of the digital processors of the remote terminal machines are connected with the input ends of the preset N corresponding radio frequency modules of the remote terminal machines through corresponding N modulators; and the output ends of the radio frequency modules of the remote terminal machines are respectively connected to each antenna outside the remote terminal machines. By adopting the device disclosed by the utility model, the cycle of system development can be shortened.
Description
Technical field
The utility model relates to indoor distributed antenna system, relates in particular to a kind of device of realizing multifrequency broadband high-speed numeral DAS.
Background technology
The problem that wireless device faces is in same sub-district, and each wireless application all needs the wireless transmit source usually, consequently causes mutual interference between the infrastructure of various redundancies easily, and the wireless environment of this confusion has hindered wireless application.A kind of DAS (Distributed Antenna System, indoor distributed antenna system) can solve the problem of phase mutual interference between wireless device, thereby high-quality wireless network is provided.
Traditional indoor distributed antenna system (DAS) is analog indoor distributed antenna system (hereinafter to be referred as analog D AS), and the hardware circuit part of analog D AS is as shown in Figure 1.The near-end machine is coupled from BTS (Ba se Transceiver Stat ion through feeder line; Base station transceiver) signal; Deliver to radio-frequency module, close the radiofrequency signal that the road becomes and become light signal through the simulated light module converts through closing the road module, light signal is transferred to remote termination in optical fiber.Remote termination changes into analog signal through the simulated light module with light signal; Analog passband signal crosses filtration module and radio-frequency module obtains the analog bandwidth signal that needs transmit, and the analog bandwidth signal amplifies after antenna is transmitted into the covering that signal is carried out in the space through the power amplifier module signal.
Existing analog D AS has following characteristics: one of which, can support the single infrastructure that multiple frequency range is used; Its two, to difference frequently interference between signals can be reduced.But there is following shortcoming in analog D AS: at first, hardware configuration is fixed, if signal bandwidth needs when changing hardware is made an amendment; Secondly, the information that can monitor is less.
The utility model content
In order to solve the problems of the technologies described above, the utility model provides a kind of device of realizing multifrequency broadband high-speed numeral DAS, can realize shortening the cycle of system development, enriches systemic-function.
The utility model provides the device of realizing multifrequency broadband high-speed numeral DAS, comprising: near-end machine, and at least one remote termination that links to each other with said near-end machine;
Link to each other through accordingly several N frequency mixers between the output of present count N near-end machine radio-frequency module in the said near-end machine and the input of near-end machine digital processing unit, the output of said near-end machine digital processing unit links to each other with the input port of said remote termination;
The input of the remote termination digital processing unit of said remote termination links to each other with the output port of said near-end machine; Link to each other through N modulator of corresponding number between the input of the output of said remote termination digital processing unit and present count N corresponding remote termination radio-frequency module, each power amplifier module of output process of each said remote termination radio-frequency module inserts each the root antenna outside the said remote termination.
Further, the device of said realization multifrequency broadband high-speed numeral DAS comprises:
The output port of said near-end machine comprises, the number/photoconverter that links to each other with the output of said near-end machine digital processing unit;
The input port of said remote termination comprises, the light/number converter that links to each other with the input of said remote termination digital processing unit;
Said number changes between optical module and the said smooth revolution module and is connected through optical fiber.
Further, the device of said realization multifrequency broadband high-speed numeral DAS also comprises:
Said near-end machine digital processing unit comprises:
The corresponding several N that link to each other with a said number/photoconverter DDC filter unit; Corresponding several N DDC extracting units that link to each other with each DDC filter unit; The corresponding several N that link to each other with each an extracting unit base band shaping filter unit; The DDC baseband processing unit that links to each other with each base band shaping filter unit, the DDC HSSI High-Speed Serial Interface unit that links to each other with this DDC baseband processing unit.
Said remote termination digital processing unit comprises:
The DUC HSSI High-Speed Serial Interface unit that links to each other with said light/number converter; The DUC baseband processing unit that links to each other with this DUC HSSI High-Speed Serial Interface unit; Corresponding several N DUC filter units that link to each other with this DUC baseband processing unit, corresponding several N the DUC extracting units that link to each other that link to each other with each DUC filter unit.
Further, the device of said realization multifrequency broadband high-speed numeral DAS also comprises:
Type of attachment between said near-end machine and at least two remote terminations is: begin from said near-end machine, successively each remote termination of cascade.Or,
Type of attachment between said near-end machine and at least two remote terminations is: with said near-end machine is the center, and each remote termination links to each other with said near-end machine.
Correspondingly, the utility model provides a kind of system that realizes multifrequency broadband high-speed numeral DAS, comprises base station transceiver, also comprises the device of foregoing realization multifrequency broadband high-speed numeral DAS, and said device and base station transceiver are of coupled connections.
Implement the utility model, have following beneficial effect:
AS compares with analog D, and digital DAS has following advantage to be, at first, when the analog signal bandwidth of system requirements changed, the mode that only needs to revise software can realize that hardware can form the scheme of hardware and software platform, shortens the cycle of system development.Secondly, increase noise suppressed, the time delay adjustment, functions such as fluctuation calibration enrich that it is functional.At last, further, networking mode flexibly can be adopted, chrysanthemum chain, star-like or mixed networking mode can be supported.
Description of drawings
Fig. 1 is the hardware configuration sketch map of the DAS of prior art;
Fig. 2 is a kind of schematic representation of apparatus that realizes multifrequency broadband high-speed numeral DAS of the utility model;
Fig. 3 is the structural representation of the DDC digital processing unit of the utility model;
Fig. 4 is the structural representation of the DUC digital processing unit of the utility model;
Fig. 5 is the sketch map of the utility model DAS digit groups net mode.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer, will combine accompanying drawing that the utility model is done to describe in detail further below.
Fig. 1 is the hardware configuration sketch map of the DAS of prior art.As shown in Figure 1, belonging to traditional indoor distributed antenna system (DAS) is analog indoor distributed antenna system.
Fig. 2 is a kind of schematic representation of apparatus that realizes multifrequency broadband high-speed numeral DAS of the utility model, and compared to Figure 1, what Fig. 2 adopted is digital DAS technology.As shown in Figure 2, comprising: near-end machine, and at least one remote termination that links to each other with said near-end machine;
Link to each other through accordingly several N frequency mixers between the output of present count N near-end machine radio-frequency module in the said near-end machine and the input of near-end machine digital processing unit, the output of said near-end machine digital processing unit links to each other with the input port of said remote termination;
The input of the remote termination digital processing unit of said remote termination links to each other with the output port of said near-end machine; Link to each other through N modulator of corresponding number between the input of the output of said remote termination digital processing unit and present count N corresponding remote termination radio-frequency module, each power amplifier module of output process of each said remote termination radio-frequency module inserts each the root antenna outside the said remote termination.
In existing indoor distributed system, mainly adopt BBU, and for base-band information provides the RHUB and the RRU of route, and the utility model can easyly be realized the multiple networking mode of indoor distributed system neatly through this method.But the present technique difference with the prior art comprises: the utility model need not use RHUB, only uses the supporting remote termination of near-end machine, uses high-speed data serial line interface and optical fiber to zoom out; Can save certain cost; In addition, the utility model is not divided into inner ring and outer ring with indoor distributed system, is applicable to the covering of indoor multi-band signal; And support multiple networking modes such as chrysanthemum chain, star-like, mixing, so strengthened the flexibility of wiring.
In addition, when the analog signal bandwidth of system requirements changed, the mode that only needs to revise software can realize that hardware can form the scheme of hardware and software platform, shortens the cycle of system development.
In one embodiment, adopt optical fiber to connect near-end machine and remote termination.
The device of said realization multifrequency broadband high-speed numeral DAS comprises:
The output port of said near-end machine comprises, the number/photoconverter that links to each other with the output of said near-end machine digital processing unit;
The input port of said remote termination comprises, the light/number converter that links to each other with the input of said remote termination digital processing unit;
Said number changes between optical module and the said smooth revolution module and is connected through optical fiber.
Different with traditional indoor distributed antenna system, the utility model adopts optical fiber to connect.Before the near-end machine transmits signal, convert digital signal to optical information earlier, after remote termination receives signal, convert light signal to digital signal again.Adopt the advantage of Optical Fiber Transmission to be: bandwidth, loss is low, and fidelity is high, reliable working performance.Especially, its antijamming capability is strong.Because the basis of optical fiber is quartzy, only pass light, non-conductive, do not receive the effect of electromagnetic field, the light signal of transmission does not receive the influence of electromagnetic field therein, so Optical Fiber Transmission has very strong defensive ability/resistance ability to electromagnetic interference, industrial interference.Also Just because of this, the signal that in optical fiber, transmits is difficult for being eavesdropped, thereby is beneficial to secret.
Fig. 3 is the structural representation of the DDC digital processing unit of the utility model.
Said near-end machine digital processing unit comprises:
N DDC filter unit of corresponding number; Corresponding several N DDC extracting units that link to each other with each DDC filter unit; The corresponding several N that link to each other with each an extracting unit base band shaping filter unit; The DDC baseband processing unit that links to each other with each base band shaping filter unit, the DDC HSSI High-Speed Serial Interface unit that links to each other with this DDC baseband processing unit.
DDC (Digital Down Converter, Digital Down Convert) is in superheterodyne receiver, if lower than primary signal through the intermediate-freuqncy signal that obtains after the mixing, this kind mixing mode is called down-conversion (Down Conver ter or DC) so.With radiofrequency signal through once or analog down several times be transformed on the intermediate frequency, to signal digitalized, and then carry out Digital Down Convert at intermediate frequency.Digital Down Convert (DigitalDown Converter or DDC) is one of core technology of software radio.When the input signal sampling rate is very big, then can adopt the down-conversion scheme of multiphase filtering, be arranged in operation link after the extraction, this structure greatly reduces the requirement to the data processing speed.
Fig. 4 is the structural representation of the DUC digital processing unit of the utility model.
Said remote termination digital processing unit comprises:
DUC HSSI High-Speed Serial Interface unit; The DUC baseband processing unit that links to each other with this DUC HSSI High-Speed Serial Interface unit; Corresponding several N DUC filter units that link to each other with this DUC baseband processing unit, corresponding several N the DUC extracting units that link to each other that link to each other with each DUC filter unit.
DUC (Digital Up Converter) Digital Up Convert; In the radio transmission link; Digital signal is through converting analog signal to; Analog signal is through obtaining the radio frequency centre frequency of the expectation higher than primary signal after the mixing, signal passes through and is amplified to suitable power level then, passes through limiting bandwidth after antenna is launched at last.The mode that this mixing frequency upwards changes is called up-conversion.Digital Up Convert (DUC) also is one of core technology of software radio.
The utility model relates to a kind of device of realizing digital DAS, and is as shown in Figure 2, comprises the radio-frequency module that connects successively, frequency mixer, DDC digital processing element, digital light module, optical fiber, DUC digital processing element, modulator, power amplifier module; Wherein the DDC digital processing element comprises interconnective AD analog to digital converter, and digital processing chip, DUC digital processing element comprise interconnective digital processing chip and DA digital to analog converter.
As shown in Figure 2; The course of work of the utility model is: the near-end machine is through the signal of feeder line coupling from BTS (base station transceiver); Deliver to radio-frequency module, be modulated into intermediate-freuqncy signal through frequency mixer, intermediate-freuqncy signal gets into the DDC digital processing element; The DDC digital processing element carries out digitized processing with signal, becomes light signal in optical fiber, to transmit through the digital light module converts.Remote termination converts light signal to digital signal through the digital light module and gets into the DUC digital processing element; The DUC digital processing element is reduced into analog if signal with digital signal; Obtain radiofrequency signal through modulator, signal is amplified after antenna is transmitted into the covering that signal is carried out in the space through radio-frequency module and power amplifier module.
Described DDC digital processing element is as shown in Figure 3; Wherein the black discontinuity point is represented a plurality of modules that possess said function; The DDC digital processing element comprises AD analog to digital converter (AD6655) and digital processing chip (FPGA), is digital processing chip inter-process part in the frame of broken lines wherein, and embodiment is following: the AD analog to digital converter receives and carries out analog-to-digital conversion after the intermediate-freuqncy signal and obtain digital signal; The entering digital processing chip is inner; Through obtaining base band data behind the filtering extraction, base band data utilizes HSSI High-Speed Serial Interface, is transformed into light signal through the digital light module and in optical fiber, transmits.
Described DUC digital processing element is as shown in Figure 4; Wherein the black discontinuity point is represented a plurality of modules that possess said function; The DUC digital processing element comprises digital processing chip (FPGA) and DA digital to analog converter (AD9788), is digital processing chip inter-process part in the frame of broken lines wherein.Light signal is transformed into digital signal after optical fiber arrives the digital light module, revert to baseband signal through HSSI High-Speed Serial Interface in digital processing chip inside, reverts to analog if signal through inputing to the DA digital to analog converter after interior the inserting.
Fig. 5 is the sketch map of the utility model DAS digit groups net mode.
Type of attachment between said near-end machine and at least two remote terminations is: begin from said near-end machine, each remote termination of cascade successively is the version of daisy chain;
Type of attachment between said near-end machine and at least two remote terminations is: with said near-end machine is the center, and each remote termination links to each other with said near-end machine, is the version of star topology.
The networking mode of the digital DAS of the utility model is as shown in Figure 5, can support chrysanthemum chain, star-like or mixed networking mode.
Correspondingly, the utility model provides a kind of system that realizes multifrequency broadband high-speed numeral DAS, comprises base station transceiver, also comprises the device of foregoing realization multifrequency broadband high-speed numeral DAS, and said device and base station transceiver are of coupled connections.
Above-described the utility model execution mode does not constitute the qualification to the utility model protection range.The modification of being done within any spirit and principle at the utility model, be equal to replacement and improvement etc., all should be included within the claim protection range of the utility model.
Claims (9)
1. a device of realizing multifrequency broadband high-speed numeral DAS is characterized in that, comprising: near-end machine, and at least one remote termination that links to each other with said near-end machine;
Link to each other through accordingly several N frequency mixers between the output of present count N near-end machine radio-frequency module in the said near-end machine and the input of near-end machine digital processing unit, the output of said near-end machine digital processing unit links to each other with the input port of said remote termination;
The input of the remote termination digital processing unit of said remote termination links to each other with the output port of said near-end machine; Link to each other through N modulator of corresponding number between the input of the output of said remote termination digital processing unit and present count N corresponding remote termination radio-frequency module, each power amplifier module of output process of each said remote termination radio-frequency module inserts each the root antenna outside the said remote termination.
2. the device of realization multifrequency broadband high-speed numeral DAS according to claim 1 is characterized in that:
The output port of said near-end machine comprises, the number/photoconverter that links to each other with the output of said near-end machine digital processing unit;
The input port of said remote termination comprises, the light/number converter that links to each other with the input of said remote termination digital processing unit;
Said number changes between optical module and the said smooth revolution module and is connected through optical fiber.
3. the device of realization multifrequency broadband high-speed numeral DAS according to claim 1 and 2 is characterized in that said near-end machine digital processing unit comprises:
N DDC filter unit of corresponding number; Corresponding several N DDC extracting units that link to each other with each DDC filter unit; The corresponding several N that link to each other with each an extracting unit base band shaping filter unit; The DDC baseband processing unit that links to each other with each base band shaping filter unit, the DDC HSSI High-Speed Serial Interface unit that links to each other with this DDC baseband processing unit.
4. the device of realization multifrequency broadband high-speed numeral DAS according to claim 3 is characterized in that said remote termination digital processing unit comprises:
DUC HSSI High-Speed Serial Interface unit; The DUC baseband processing unit that links to each other with this DUC HSSI High-Speed Serial Interface unit; Corresponding several N DUC filter units that link to each other with this DUC baseband processing unit, corresponding several N the DUC extracting units that link to each other that link to each other with each DUC filter unit.
5. the device of realization multifrequency broadband high-speed according to claim 1 and 2 numeral DAS is characterized in that, the type of attachment between said near-end machine and at least two remote terminations is: begin from said near-end machine, successively each remote termination of cascade.
6. the device of realization multifrequency broadband high-speed according to claim 4 numeral DAS is characterized in that, the type of attachment between said near-end machine and at least two remote terminations is: begin from said near-end machine, successively each remote termination of cascade.
7. the device of realization multifrequency broadband high-speed according to claim 1 and 2 numeral DAS is characterized in that, the type of attachment between said near-end machine and at least two remote terminations is: with said near-end machine is the center, and each remote termination links to each other with said near-end machine.
8. the device of realization multifrequency broadband high-speed according to claim 4 numeral DAS is characterized in that, the type of attachment between said near-end machine and at least two remote terminations is: with said near-end machine is the center, and each remote termination links to each other with said near-end machine.
9. a system that realizes multifrequency broadband high-speed numeral DAS comprises base station transceiver, it is characterized in that: comprise that also said device and base station transceiver are of coupled connections like the device of the arbitrary described realization multifrequency broadband high-speed numeral DAS of claim 1 to 8.
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| CN 201220131201 CN202587393U (en) | 2012-03-30 | 2012-03-30 | Device for realizing multi-frequency broadband high-speed digital distributed antenna system (DAS) |
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| CN 201220131201 CN202587393U (en) | 2012-03-30 | 2012-03-30 | Device for realizing multi-frequency broadband high-speed digital distributed antenna system (DAS) |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103313271A (en) * | 2013-05-24 | 2013-09-18 | 南京泰通电子科技有限公司 | Tunnel TD-LTE (Time Division Long Term Evolution) fiber-distributed covering system and working method thereof |
| CN111181595A (en) * | 2019-12-31 | 2020-05-19 | 京信通信系统（中国）有限公司 | Second harmonic cancellation method and device and DAS remote machine |
| WO2020248529A1 (en) * | 2019-06-12 | 2020-12-17 | 京信通信系统（中国）有限公司 | Distributed antenna system, method and apparatus |
| CN113794665A (en) * | 2021-09-14 | 2021-12-14 | 广州犇一信息科技有限公司 | System and method for reducing tunnel communication interference |
-
2012
- 2012-03-30 CN CN 201220131201 patent/CN202587393U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103313271A (en) * | 2013-05-24 | 2013-09-18 | 南京泰通电子科技有限公司 | Tunnel TD-LTE (Time Division Long Term Evolution) fiber-distributed covering system and working method thereof |
| WO2020248529A1 (en) * | 2019-06-12 | 2020-12-17 | 京信通信系统（中国）有限公司 | Distributed antenna system, method and apparatus |
| US11923905B2 (en) | 2019-06-12 | 2024-03-05 | Comba Network Systems Company Limited | Distributed antenna system, method and apparatus |
| CN111181595A (en) * | 2019-12-31 | 2020-05-19 | 京信通信系统（中国）有限公司 | Second harmonic cancellation method and device and DAS remote machine |
| CN113794665A (en) * | 2021-09-14 | 2021-12-14 | 广州犇一信息科技有限公司 | System and method for reducing tunnel communication interference |
| CN113794665B (en) * | 2021-09-14 | 2024-01-05 | 广州犇一信息科技有限公司 | System and method for reducing tunnel communication interference |
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Granted publication date: 20121205 |