CN102291725A - Multimode digital radio frequency remote system - Google Patents
Multimode digital radio frequency remote system Download PDFInfo
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- CN102291725A CN102291725A CN2011100007030A CN201110000703A CN102291725A CN 102291725 A CN102291725 A CN 102291725A CN 2011100007030 A CN2011100007030 A CN 2011100007030A CN 201110000703 A CN201110000703 A CN 201110000703A CN 102291725 A CN102291725 A CN 102291725A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/10—Access point devices adapted for operation in multiple networks, e.g. multi-mode access points
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
Abstract
The invention discloses a multimode digital radio frequency remote system, which comprises at least one far end covering machine, a base band router and a plurality of near end relays, wherein the far end covering machine is connected with the base band router, and the base band router is then respectively connected with each near end relay, is used for receiving signals in different systems in the near end relays, sends the merged signals to the remote end covering machine, receives the signals in the far end covering machine and respectively sends the dismounted signals to each near end relay in correspondingly systems. The multimode digital radio frequency remote system can solve the problem that when the near end relays in different systems are not in the same plate and no optical fiber connection is adopted between the near end relays in different systems, the application of the multimode digital radio frequency remote system is limited, the application limitation of the multimode digital radio frequency remote system is improved, the flexible application of the multimode digital radio frequency remote system is realized, in addition, the multimode digital radio frequency remote system can save a large number of optical fiber resources, the networking is convenient, and good market prospects are realized.
Description
Technical field
The present invention relates to the digital direct discharging station design field, be specifically related to a kind of multimode digital RF far-drawing system.
Background technology
In the mobile communications network, digital RF far-drawing system is as the extension of base station in the overlay network and replenish, and can improve signal quality, solves the call drop problem of weak signal area and blind area, becomes the major part that mobile communications network covers day by day.2G network and 3G network are with long-term co-existence in the present stage mobile communications network, the 2G network that mobile operator has the TD licence plate of 3G network at present and runs always, add the wlan network that more and more widely uses, the multimode digital RF far-drawing system that possesses 2G, 3G and WLAN transmission simultaneously, will carry out many nets to operator builds together and saves a large amount of costs, also the engineering that can build together for many nets is brought very big facility, therefore has extensive market prospects.
With TD+GSM+WLAN multimode digital RF far-drawing system is example: the GSM of this system is descending be by the GSM relay directly from base station coupling downstream signal, reach the far-end mulch-laying machine through optical fiber, cover through after the processing and amplifying; GSM is up to be that signal is connected to the base station receiving terminal by coupler after the far-end mulch-laying machine reaches the relaying terminal.The descending TD of the being near-end of TD reaches the far-end mulch-laying machine from the TD-RRU downstream signal that directly is coupled through optical fiber, covers through after the processing and amplifying; TD is up to be that signal is connected to the TD-RRU receiving terminal by coupler after the far-end mulch-laying machine reaches the relaying terminal.The WLAN transmission is a transparent baseband transmission link to be provided between GSM near-end and the far-end or between TD near-end and the far-end, to make full use of existing fiber resource.Realize the multimode digital RF far-drawing system, the description of the course of work of the communication network by above-mentioned different systems, can find a defective, promptly working as GSM base station and TD-RRU is not in same place, and the words that do not have fiber resource to connect between the two places, bring significant limitation can for like this application of multimode digital RF far-drawing system, be unfavorable for very much the popularization and the application of multimode digital RF far-drawing system.
Summary of the invention
For addressing the above problem, the present invention discloses a kind of multimode digital RF far-drawing system, can solve relay when a plurality of different network formats not in same place, and the problem that does not have the application of multimode digital RF far-drawing system under the situation that fiber resource connects to be restricted each other.
The present invention adopts following technical scheme:
A kind of multimode digital RF far-drawing system comprises at least one far-end mulch-laying machine, base band router and a plurality of near-end repeater; The far-end mulch-laying machine is connected with the base band router, and the base band router is connected with each near-end repeater respectively again;
The base band router is used for receiving the signal of a plurality of near-end repeater different systems, merges processing, and the signal after will merging sends to the far-end mulch-laying machine; And the signal in the reception far-end mulch-laying machine, carry out deconsolidation process, and the signal after will splitting sends to each near-end repeater of corresponding standard respectively.
Multimode digital RF far-drawing system among the present invention, with the base band router signal of multiple standard being closed the road before far-end is zoomed out separately in the near-end relay of different systems handles, the signal of multiple standard can be transmitted in an optical fiber, again this is closed the road signal and carry out many net coverings, so just can realize the flexible Application of multimode digital RF far-drawing system by the far-end mulch-laying machine; And radio frequency stretch system of the present invention, can save fiber resource in a large number, networking flexibility is convenient, has market prospects preferably.
Description of drawings
Fig. 1 is a multimode digital RF far-drawing system schematic diagram;
Fig. 2 is a base band router hardware digital module block diagram;
Fig. 3 is a base band router downlink transfer chain graph;
Fig. 4 is a base band router uplink chain graph;
Fig. 5 is specific embodiment one a multimode digital RF far-drawing system schematic diagram;
Fig. 6 is specific embodiment two multimode digital RF far-drawing system schematic diagrames.
Embodiment
The invention provides a kind of multimode digital RF far-drawing system, this system can solve the relay of different network formats in the prior art not in same place, and the problem that does not have the application of multimode digital RF far-drawing system under the situation that fiber resource connects to be restricted between the two places.
Multimode digital RF far-drawing system provided by the invention comprises at least one far-end mulch-laying machine, base band router and a plurality of near-end repeater, and the far-end mulch-laying machine is connected with the base band router, and the base band router also is connected with each near-end repeater respectively; The function of base band router is the signal that receives different systems in a plurality of near-end repeaters, sends signal to the far-end mulch-laying machine after merging processing; And receive signal in the far-end mulch-laying machine, carry out signal being sent to respectively after the deconsolidation process each near-end repeater of corresponding standard, as shown in Figure 1.Describe technical scheme of the present invention in detail below in conjunction with accompanying drawing.
Embodiment one
Multimode digital RF far-drawing system with GSM+TD+WLAN is an example, and multimode digital RF far-drawing system of the present invention comprises GSM repeater, TD repeater, far-end mulch-laying machine and base band router.
Be illustrated in figure 2 as the hardware digital module block diagram of base band router, this base band router comprises fpga chip, CPU, power supply POWER, two light mouth OP1 and OP2, two TLK1501 (serializer/de-serializers), a TLK4015 (serializer/de-serializers), four light mouth OP1 ', OP2 ', OP3 ' and OP4 ' that are connected respectively with different far-end mulch-laying machines that connect respectively with the near-end repeater.With the transmission direction of base band router downstream signal is example, OP1 and OP2 realize that by TLK1501 the serial/parallel conversion of signal sends signal to fpga chip, fpga chip is as requested through realizing the parallel/serial conversion of signal by TLK4015 after the merging of signal or the deconsolidation process, and transmit a signal to light mouth OP1 ', OP2 ', OP3 ' and OP4 ' respectively; POWER provides power supply for the base band router, and CPU is connected with fpga chip, and its function is that the base band router is monitored and controlled.In system of the present invention, CPU and fpga chip are packaged into a module in addition, are called baseband processing unit.
Describe the course of work of base band router below in detail.At first need to prove the respectively corresponding light/electric modular converter of each light mouth in the base band router, the function of this light/electric modular converter is to carry out the conversion of light/electricity, and the light signal that soon receives from optical fiber is converted to the signal of telecommunication or is light signal with electrical signal conversion.
The downgoing baseband transmission course of base band router, at first be (specifically to be included as the GSM downstream signal here by the signal that two light/electric modular converter receives the different systems in connected each near-end repeater respectively, the TD-A downstream signal, TD-F downstream signal and WLAN signal), carry out light/electricity conversion, serial/parallel processing, then signal is delivered to fpga chip in the baseband processing unit, predefined program is arranged in the fpga chip, merge according to the multiple signals of this program running rule these different systems, be about to the GSM downstream signal, the TD-A downstream signal, TD-F downstream signal and WLAN signal merge, again the signal after merging is carried out sending to respectively in four light/electric modular converter after the parallel/serial processing, carry out signal by this four light/electric modular converter again and send to the far-end mulch-laying machine that is connected respectively with it, finally finish the downgoing baseband transmission of base band router, as shown in Figure 3.In fact, fpga chip also needed at first to carry out the process of a fractionation before carrying out the multiple signals merging, promptly GSM downstream signal and WLAN signal are split, or to the TD-A downstream signal, TD-F downstream signal and WLAN signal split, the signal of each the independent standard after just these being split then carries out a total merging, because the signal that is received from each near-end repeater is not the signal of independent standard before this, but signal that merges among a small circle, so just need earlier signal to be split among a small circle, carry out total signal again and merge.
The uplink baseband transmission course of base band router, by with four light/electric modular converter of far-end mulch-laying machine communication in one or more (according to how many decisions of cascade far-end mulch-laying machine link) received signal, carry out light/electricity conversion, parallel/serial processing, then signal is sent into the fpga chip in the baseband processing unit, fpga chip at first can carry out deconsolidation process to the signal of different systems according to predefined program, the GSM upward signal, the TD-A upward signal, TD-F upward signal and WLAN signal split, then GSM upward signal and WLAN signal are merged some light/electric modular converter of delivering to the communication of near-end repeater, the TD-A upward signal, TD-F upward signal and WLAN signal merge light/electric modular converter of delivering to another near-end repeater communication, then the uplink baseband transmission course of base band router finishes, as shown in Figure 4.
As an embodiment preferably, base band router of the present invention has four light mouths that are connected with the far-end mulch-laying machine, corresponding four light/electric modular converters, the signal of these four light/electric modular converter transmission all is the same, therefore a base band router can draw four far-end mulch-laying machines, can realize star-like networking, daisy chain networking, mixed networking and the ring-shaped network etc. of multimode digital RF far-drawing system, bring great flexibility for the networking of multimode digital RF far-drawing system.
In the base band router, have this module of baseband processing unit in the system of the present invention, GSM repeater, TD repeater and far-end mulch-laying machine also include baseband processing unit, the function of this baseband processing unit is to carry out the fractionation of signal, merging and respectively residing equipment is separately monitored and controlled, so the processing that also all can split, merge signal of each near-end repeater and far-end mulch-laying machine.
The course of work of near-end repeater is: down direction, each near-end repeater of different systems receives the signal of the corresponding standard of respective base station transmission, the GSM signal that receives as repeater herein for the transmission of GSM base station, the TD signal that another repeater receives for the TD-RRU transmission, then in near-end repeater separately, GSM signal and WLAN signal are merged, perhaps TD signal and WLAN signal are merged, the signal after will merging then sends to the base band router respectively; Up direction, the WLAN signal in each near-end repeater reception base band router of different systems and the signal of described corresponding standard, receive WLAN signal and GSM signal as being respectively the GSM repeater here, perhaps receive WLAN signal and TD signal for the TD repeater, carry out after the deconsolidation process will this corresponding standard signal send to corresponding base station, being about to the GSM signal sends in the base station of GSM, the TD signal is sent among the TD-RRU, and the WLAN signal then directly carries out the transmission of wireless signal in each repeater.
The course of work of far-end mulch-laying machine is: down direction, the far-end mulch-laying machine receives the combined signal (GSM+TD-A+TD-F+WLAN) in the base band router, carry out becoming independent GSM signal, TD-A signal, TD-F signal or WLAN signal after the deconsolidation process, respectively that these are independent then signal carries out far-end and covers (sending to the user); Up direction, the far-end mulch-laying machine receives signal and the WLAN signal from each aerial corresponding standard, send to described base band router after merging processing, the signal of corresponding standard is meant GSM signal or TD signal (comprising TD-A signal and TD-F signal) here.
Describe the concrete operation principle of whole multimode digital RF system below in detail.As shown in Figure 5, GSM relaying terminal is by forming with lower module: relay duplexer 100, down conversion module 101, A/D converter 102, Digital Down Convert path 10 3, baseband processing unit 104, Digital Up Convert passage 113, D/A converter 112, up-conversion module 111, light/electric modular converter 105, light/electric modular converter 106; Wherein 100,101,102,103 and 104 connect successively, and 104,113,112,111 and 100 connect successively, and 104 also are connected with 105 and 106 respectively, and 100 by direct coupler and base station communication, and 106 are connected with the base band router by optical fiber.
In addition, the TD repeater is by forming with lower module: relay duplexer 200, circulator 201, down conversion module 202, A/D converter 203, Digital Down Convert passage 204, baseband processing unit 205, Digital Up Convert passage 213, D/A converter 212, up-conversion module 211, light/electric modular converter 206, circulator 221, down conversion module 222, A/D converter 223, Digital Down Convert passage 224, Digital Up Convert passage 233, D/A converter 232, up-conversion module 231, light/electric modular converter 207; 201,202,203,204,205,213,212 and 211 connect into ring successively from beginning to end, 221,222,223,224,205,233,232,231 connect into ring successively from beginning to end, 200 are connected with 201 and 221 respectively, 200 also by direct coupler and TD-RRU communication, 205 also are connected with 206 and 207 respectively, and 206 are connected with the base band router by optical fiber.
The far-end mulch-laying machine is by forming with lower module: light/electric modular converter 401, light/electric modular converter 402, light/electric modular converter 403, baseband processing unit 404, duplexer 405, Digital Up Convert passage 411, D/A converter 414, up-conversion module 415, downlink power amplifier 416, circulator 417, Digital Down Convert passage 421, A/D converter 422, down conversion module 423, up LNA module 424, Digital Up Convert passage 431, D/A converter 434, up-conversion module 435, downlink power amplifier 436, circulator 437, Digital Down Convert passage 441, A/D converter 442, down conversion module 443, up LNA module 444, Digital Up Convert passage 451, D/A converter 454, up-conversion module 455, downlink power amplifier 456, Digital Down Convert passage 461, A/D converter 462, down conversion module 463, up LNA module 464; 404,411,414,415,416,417,424,423,422 and 421 connect into ring successively from beginning to end, 404,431,434,435,436,437,444,443,442 and 441 connect into ring successively from beginning to end, 404,451,454,455,456,405,464,463,462 and 461 connect into ring successively from beginning to end, 404 also are connected with 401,402 and 403 respectively, 402 by optical fiber and the communication of base band router, 405 also are connected with 417 and 437 respectively, and 405 cover or receive aerial signal by covering/reception antenna 406.
Describe whole GSM uplink process in detail below in conjunction with accompanying drawing 5.The GSM radiofrequency signal that covering/reception antenna 406 is received from air interface, reach duplexer 405, obtain comparatively pure up radiofrequency signal behind other unwanted signals of duplexer filtering, up radiofrequency signal is through after the up LNA module 464,40dB is amplified in the big appointment of amplitude, pass through down conversion module 463 again, up radiofrequency signal will be downconverted to analog if signal, behind the analog if signal process A/D converter 462, become digital signal, through becoming baseband signal behind the Digital Down Convert passage 461, enter baseband processing unit 404 again, in baseband processing unit, fpga chip is handled signal, according to certain agreement (as the CPRI agreement) with the signal framing, signal after the framing and the signal behind the up framing of TD-A, signal behind the up framing of TD-F, the WLAN signal merges, signal after the merging is reached light/electric modular converter 402, in light/electric modular converter, signal is a light signal from electrical signal conversion, in optical fiber, transmit, signal is through the light/electric modular converter 304 of Optical Fiber Transmission to the base band router, carry out light/electricity conversion through light/electric modular converter, light signal is converted to the signal of telecommunication, through baseband processing unit 303, fpga chip splits to merge to signal and handles, the GSM upward signal, the TD-A upward signal, TD-F upward signal and WLAN signal split and come, GSM upward signal and the merging of WLAN signal are delivered to light/electric modular converter 301, in light/electric modular converter, signal is a light signal from electrical signal conversion, in optical fiber, transmit, signal is through the light/electric modular converter 106 of Optical Fiber Transmission to GSM relaying terminal, by light/electric modular converter light signal is converted to the signal of telecommunication, then by baseband processing unit 104, fpga chip carries out deconsolidation process to signal, GSM upward signal and the shunt of WLAN signal, the GSM signal is separated frame, by Digital Up Convert passage 113, baseband signal is become digital intermediate frequency signal, be transformed to analog if signal by D/A converter 112, be transformed to radiofrequency signal by up-conversion module 111, through reaching the base station behind the relay duplexer 100.
GSM is descending to be the signal that comes out by suitable coupling base station, and the signal that is coupled out will have individual suitably scope, promptly will can not make coupled signal too big again by assurance equipment release power.The signal that the base station is coupled out is by relay duplexer 100, guarantee pure downstream signal, by down conversion module 101, downlink radio-frequency signal will be downconverted to analog if signal, analog if signal is through A/D converter 102, become digital signal, through becoming baseband signal behind the Digital Down Convert path 10 3, enter baseband processing unit 104 again, 104 li of baseband processing units, fpga chip is handled signal, according to certain agreement (as the CPRI agreement) with the signal framing, signal and WLAN signal after the framing merge, signal after the merging is reached light/electric modular converter 106, in light/electric modular converter, signal is a light signal from electrical signal conversion, in optical fiber, transmit, signal is through the light/electric modular converter 301 of Optical Fiber Transmission to the base band router, carry out light/electricity conversion, light signal is converted to the signal of telecommunication, pass through baseband processing unit 303 then, fpga chip splits to merge to signal and handles, GSM downstream signal and WLAN signal are split the laggard row that comes to be reconsolidated, the GSM downstream signal, the TD-A downstream signal, after merging, TD-F downstream signal and WLAN signal deliver to the light/electric modular converter 304 of base band router, by light/electric modular converter, is electrical signal conversion light signal, in optical fiber, transmit, signal process Optical Fiber Transmission is to far-end mulch-laying machine light/electric modular converter 402, light signal is converted to the signal of telecommunication, through baseband processing unit 404, fpga chip is handled signal, with the GSM downstream signal, the TD-A downstream signal, TD-F downstream signal and WLAN signal carry out shunt to be handled, the GSM downstream signal is separated frame, by Digital Up Convert passage 451, baseband signal up-converts to digital intermediate frequency signal, be transformed to analog if signal by D/A converter 454, by up-conversion module 455, analog if signal up-converts to radiofrequency signal, behind power amplifier 456 amplifying signals, cover by reaching covering/reception antenna 406 behind the duplexer 405.
The up reception antenna of TD-A is received the TD-A radiofrequency signal from air interface, reach duplexer 405, obtain comparatively pure up radiofrequency signal behind other unwanted signals of duplexer filtering, up radiofrequency signal is through circulator 417, up LNA module 424,30dB is amplified in the big appointment of LNA module, pass through down conversion module 423 again, up radiofrequency signal will be downconverted to analog if signal, analog if signal is through A/D converter 422, become digital signal, through becoming baseband signal behind the Digital Down Convert passage 421, enter baseband processing unit 404 again, in baseband processing unit, fpga chip is handled signal, signal will be by according to certain agreement (as the CPRI agreement) framing, signal after the framing and the signal behind the up framing of GSM, signal behind the up framing of TD-F, the WLAN signal merges, signal after the merging is reached light/electric modular converter 402, in light/electric modular converter, signal is a light signal from electrical signal conversion, in optical fiber, transmit, signal is through the light/electric modular converter 304 of Optical Fiber Transmission to the base band router, carry out light/electricity conversion by light/electric modular converter, light signal is converted to the signal of telecommunication, through baseband processing unit 303, fpga chip splits signal to merge and handles, with the GSM upward signal, the TD-A upward signal, TD-F upward signal and WLAN signal split and come, then the TD-A upward signal, light/electric modular converter 302 of delivering to the base band router after TD-F upward signal and WLAN signal merge is through light/electric modular converter, signal is a light signal from electrical signal conversion, in optical fiber, transmit, signal process Optical Fiber Transmission is to TD relaying terminal light/electric modular converter 206, light signal is converted to the signal of telecommunication, through baseband processing unit 205, fpga chip in the baseband processing unit 205 carries out deconsolidation process to signal, the TD-A upward signal, TD-F upward signal and WLAN signal are along separate routes, then the TD-A signal is separated frame, by Digital Up Convert passage 213, baseband signal up-converts to digital intermediate frequency signal, through D/A converter 212 and up-conversion module 211, signal up-converts to radiofrequency signal, through reaching TD-RRU behind circulator 201 and the relay duplexer 200.
TD-A is descending to be the signal that comes out by suitable coupling TD-RRU, and the signal that is coupled out will have individual suitably scope, promptly will can not make coupled signal too big again by assurance equipment release power.The signal that TD-RRU is coupled out is by relay duplexer 200, guarantee pure downstream signal, by circulator 201 and down conversion module 202, downlink radio-frequency signal will be downconverted to analog if signal, behind the analog if signal process A/D converter 203, become digital signal, through becoming baseband signal behind the Digital Down Convert passage 204, enter baseband processing unit 205 again, in baseband processing unit, fpga chip is handled signal, according to certain agreement (as the CPRI agreement) with the signal framing, signal after the framing merges with downstream signal behind the TD-F framing and WLAN signal, signal after the merging is reached light/electric modular converter 206, in light/electric modular converter, signal is a light signal from electrical signal conversion, in optical fiber, transmit, signal is through the light/electric modular converter 302 of Optical Fiber Transmission to the base band router, carry out light/electricity conversion, light signal is converted to the signal of telecommunication, carry out Base-Band Processing through baseband processing unit 303, fpga chip splits to merge to signal and handles, the TD-A downstream signal, TD-F downstream signal and WLAN signal split the laggard row that comes and reconsolidate, the GSM downstream signal, the TD-A downstream signal, TD-F downstream signal and WLAN signal merge light/electric modular converter 304 of delivering to the base band router, through light/electric modular converter is signal light signal from electrical signal conversion, in optical fiber, transmit, signal is through the light/electric modular converter 402 of Optical Fiber Transmission to the far-end mulch-laying machine, light signal is converted to the signal of telecommunication, carry out Base-Band Processing by baseband processing unit 404, fpga chip in the baseband processing unit 404 carries out deconsolidation process to signal, with the GSM downstream signal, the TD-A downstream signal, TD-F downstream signal and WLAN signal carry out shunt to be handled, the TD-A downstream signal is separated frame, be transformed to digital intermediate frequency signal by Digital Up Convert passage 411, be transformed to analog if signal by D/A converter 414, up-convert to radiofrequency signal through up-conversion module 415, through behind downlink power amplifier 416 and the circulator 417, amplifying signal reaches covering/reception antenna 406 after by duplexer 405 and covers.
The uplink and downlink transmission course of TD-F is the same with the TD-A frequency range, repeats no more here.
WLAN only provides a baseband transmission link, carries out the transparent transmission of WLAN.As follows to transmission course the far-end mulch-laying machine from the GSM repeater: the WLAN light signal is by light/electric modular converter 105 the GSM near-end, light signal is converted to the signal of telecommunication, carry out Base-Band Processing by baseband processing unit 104, fpga chip in the baseband processing unit 104 is handled signal, according to certain agreement (as the CPRI agreement) with the signal framing, signal after the framing and the downstream signal behind the GSM framing merge, signal after the merging is reached light/electric modular converter 106, in light/electric modular converter, signal is a light signal from electrical signal conversion, in optical fiber, transmit, signal is through the light/electric modular converter 301 of Optical Fiber Transmission to the base band router, carry out light/electricity conversion, light signal is converted to the signal of telecommunication, carry out Base-Band Processing through baseband processing unit 303, fpga chip splits to merge to signal and handles, GSM downstream signal and WLAN signal are split the laggard row that comes to be reconsolidated, the GSM downstream signal, the TD-A downstream signal, TD-F downstream signal and WLAN signal merge light/electric modular converter 304 of delivering to the base band router, through light/electric modular converter is signal light signal from electrical signal conversion, in optical fiber, transmit, signal is through the light/electric modular converter 402 of Optical Fiber Transmission to the far-end mulch-laying machine, light signal is converted to the signal of telecommunication, by baseband processing unit 404, fpga chip carries out Base-Band Processing to signal, with the GSM downstream signal, the TD-A downstream signal, TD-F downstream signal and WLAN signal carry out shunt to be handled, the base band data of WLAN is delivered to light/electric modular converter 403 to be handled.
The WLAN signal is as follows to transmission course the GSM near-end repeater from the far-end mulch-laying machine: the WLAN light signal is by light/electric modular converter 403, light signal is converted to the signal of telecommunication, by baseband processing unit 404, in baseband processing unit, fpga chip carries out Base-Band Processing to signal, signal will be by according to certain agreement (as the CPRI agreement) framing, signal after the framing and the signal behind the up framing of TD-A, signal behind the up framing of TD-F, signal behind the up framing of GSM merges, signal after the merging is reached light/electric modular converter 402, in light/electric modular converter, signal is a light signal from electrical signal conversion, in optical fiber, transmit, signal is through the light/electric modular converter 304 of Optical Fiber Transmission to the base band router, carry out light/electricity conversion through light/electric modular converter, light signal is converted to the signal of telecommunication, through baseband processing unit 303, fpga chip splits to merge to signal and handles, the GSM upward signal, the TD-A upward signal, TD-F upward signal and WLAN signal split and come, GSM upward signal and the merging of WLAN signal are delivered to light/electric modular converter 301, in light/electric modular converter, signal is a light signal from electrical signal conversion, in optical fiber, transmit, signal is through the light/electric modular converter 106 of Optical Fiber Transmission to GSM relaying terminal, by light/electric modular converter light signal is converted to the signal of telecommunication, then by baseband processing unit 104, fpga chip carries out deconsolidation process to signal, GSM upward signal and the shunt of WLAN signal, the base band data of WLAN is delivered to light/electric modular converter 105 to be handled.
The transmission of WLAN from TD near-end repeater to the far-end mulch-laying machine is identical with GSM to the transmission of TD near-end repeater with the far-end mulch-laying machine, repeats no more here.The transmission bandwidth of WLAN can dynamic assignment, when few or TD carrier number is few when the carrier number of the GSM that in fact uses, can give WLAN resource allocation dynamically, makes WLAN have bigger transmission bandwidth.
Because the WLAN function system only provides a transparent baseband transmission, fixedly downlink data will not transmit to the far-end mulch-laying machine from the near-end repeater, transmit from the far-end mulch-laying machine to the near-end repeater and also to be fine, like this by behind the base band router, WLAN can realize that all far-ends arrive the transmission of all near-ends and the transmission that all near-ends arrive all far-ends, have improved the scope of WLAN baseband transmission in the multimode digital RF far-drawing system greatly.
When being combined, the radio frequency stretch system of different systems also to solve the problem of clock synchronization.Clock synchronization scheme provided by the present invention is as follows: whole system has only a clock, and the clock of setting here with GSM relaying terminal is a reference clock, and other equipment in the whole system and GSM relaying terminal carry out clock synchronization.The base band router adopts clock Recovery by OP1 light/electric modular converter, realizes that the laggard row clock of Clock Extraction is synchronous.
Multimode digital RF far-drawing system of the present invention, because signal accords with by flag of frame after framing and distinguishing, therefore under the situation that keeps independence separately, the uplink and downlink of multiple signal can transmit in same optical fiber, so this system can only use a pair of light/electric modular converter, an optical fiber to realize transmitting multiple signal.As a preferred embodiment, light/electric modular converter of selecting to have the wavelength division multiplexing function can be realized this function better.Light/electric modular converter with wavelength division multiplexing function can be used the recovery that sends and receive two kinds of different wave lengths to an optical fiber, like this, all only need an optical fiber to connect between near-end repeater and base band router, base band router and the far-end mulch-laying machine, saved fiber resource greatly.
Multimode digital RF far-drawing system disclosed by the invention closes the road by the base band router to the signal of multiple standard and handles, and the signal of multiple standard can be transmitted in an optical fiber, thereby realizes that far-end covers.This function of base band router has determined it not only only to be applicable to TD+GSM+WLAN multimode digital RF far-drawing system, can be applied in equally in the multimode digital RF far-drawing system of other standards, as WCDMA+GSM+WLAN multimode digital RF far-drawing system, WCDMA+DCS1800+WLAN multimode digital RF far-drawing system, TD+DCS1800+WLAN multimode digital RF far-drawing system etc.
Embodiment two
As a preferred embodiment, the far-end mulch-laying machine can also comprise CFR (Crest Factor Reduction, crest factor dwindles) module, DPD (Digital Pre-Distortion, digital pre-distortion) module, feedback down-conversion module and feedback A/D converter, the CFR module is connected with Digital Up Convert passage and DPD module respectively, the DPD module also is connected with the D/A converter, the feedback down-conversion module is connected with downlink power amplifier and feedback A/D converter respectively, feedback A/D converter also is connected with the DPD module, as shown in Figure 6.
With the GSM passage is example, after baseband signal up-converts to digital intermediate frequency signal by Digital Up Convert passage 451, at first adopt the peak technology that disappears that the signal peak that disappears is handled by CFR module 452, DPD module 453 receives the signal that sends among the CFR and adopts the DPD technology further to handle then, signal after handling is sent in the D/A converter, at this moment corresponding DPD module also need be at signal of downlink power amplifier 456 outputs coupling, it is the signal that feedback down-conversion module 457 receives in the downlink power amplifier 456, process is transformed to analog if signal, and is sent to feedback A/D converter 458; Feedback A/D converter is transformed into digital signal with intermediate-freuqncy signal, sends to DPD module 453 and carries out the DPD algorithm process with forward signal.
TD-A passage and TD-F passage and GSM channel types seemingly repeat no more here.CFR technology and DPD technology are applied to the multimode digital RF far-drawing system, can reduce signal peak-to-average ratio, improve the signal linearity and overall efficiency, make smaller and more exquisite, light that complete machine structure can do.
By above two embodiment, solved in the prior art relay in the multimode digital RF far-drawing system not in same place, and do not had under the situation that fiber resource connects the problem that the application of multimode digital RF far-drawing system is restricted between the two places.Multimode digital RF far-drawing system of the present invention, the near-end repeater separates, and owing to used the base band router, improved the application limitation of multimode digital RF far-drawing system, realized the flexible networking of multimode digital RF far-drawing system, the multi-modulation scheme that has guaranteed far-end covers, and has saved a large amount of fiber resources, has broad application prospect on using.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (9)
1. a multimode digital RF far-drawing system comprises at least one far-end mulch-laying machine and a plurality of near-end repeater, it is characterized in that, also comprises the base band router; Described far-end mulch-laying machine is connected with described base band router, and described base band router also is connected with described each near-end repeater respectively;
Described base band router is used for receiving the signal of described a plurality of near-end repeater different systems, merges processing, and the signal after will merging sends to described far-end mulch-laying machine; And receive signal in the described far-end mulch-laying machine, carry out deconsolidation process, and the signal after will splitting sends to each near-end repeater of corresponding standard respectively.
2. multimode digital RF far-drawing system according to claim 1 is characterized in that, described near-end repeater is used to receive the signal of the corresponding standard that different base station sends, and sends to described base band router after merging with the WLAN signal; And receive the WLAN signal in the described base band router and the signal of described corresponding standard, carry out after the deconsolidation process signal of described corresponding standard is sent to corresponding base station.
3. multimode digital RF far-drawing system according to claim 2 is characterized in that described far-end mulch-laying machine is used for receiving the combined signal of described base band router, carries out carrying out the far-end covering after the deconsolidation process; And the signal and the WLAN signal that receive each corresponding standard, send to described base band router after merging processing.
4. multimode digital RF far-drawing system according to claim 1, it is characterized in that, described far-end mulch-laying machine comprises the CFR module, described CFR module is used for receiving the signal of the Digital Up Convert passage of described far-end mulch-laying machine, adopts crest factor to dwindle and after the CFR technology is handled signal is sent.
5. multimode digital RF far-drawing system according to claim 4, it is characterized in that, described far-end mulch-laying machine also comprises the DPD module, described DPD module is used for receiving the signal of described CFR, after employing digital pre-distortion DPD technology is handled signal is sent to the D/A converter of described far-end mulch-laying machine.
6. multimode digital RF far-drawing system according to claim 5, it is characterized in that, described far-end mulch-laying machine also comprises feedback down-conversion module and feedback A/D converter, described feedback down-conversion module receives the signal in the downlink power amplifier, process is transformed to analog if signal, and is sent to described feedback A/D converter; Described feedback A/D converter is transformed into digital signal with described intermediate-freuqncy signal, sends to described DPD module and forward signal and carries out the DPD algorithm process.
7. according to the described multimode digital RF far-drawing system of claim 1-6, it is characterized in that, each light mouth draws a near-end repeater or far-end mulch-laying machine in the described base band router, and the networking mode of realization comprises: Star network, chrysanthemum link network, ring-like net or hybrid network.
8. multimode digital RF far-drawing system according to claim 7, it is characterized in that, corresponding light/electric the modular converter of described each light mouth, described light/electric modular converter are used for light/electricity conversion, also are used for the recovery of two kinds of different wave lengths is used to an optical fiber.
9. multimode digital RF far-drawing system according to claim 3, it is characterized in that the standard of the multimode digital RF far-drawing system that described base band router is suitable for comprises: TD+GSM+WLAN, WCDMA+GSM+WLAN, WCDMA+DCS1800+WLAN, TD+DCS1800+WLAN.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110000703.0A CN102291725B (en) | 2011-01-04 | 2011-01-04 | Multimode digital radio frequency remote system |
| PCT/CN2011/084259 WO2012092810A1 (en) | 2011-01-04 | 2011-12-20 | Multimode digital radio-frequency remote system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110000703.0A CN102291725B (en) | 2011-01-04 | 2011-01-04 | Multimode digital radio frequency remote system |
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| CN102291725A true CN102291725A (en) | 2011-12-21 |
| CN102291725B CN102291725B (en) | 2014-09-10 |
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| CN201110000703.0A Expired - Fee Related CN102291725B (en) | 2011-01-04 | 2011-01-04 | Multimode digital radio frequency remote system |
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Also Published As
| Publication number | Publication date |
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| WO2012092810A1 (en) | 2012-07-12 |
| CN102291725B (en) | 2014-09-10 |
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