CN101166059B - An automatic time delay measurement method and system for optical fiber remote soft base station - Google Patents
An automatic time delay measurement method and system for optical fiber remote soft base station Download PDFInfo
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- CN101166059B CN101166059B CN2007101657881A CN200710165788A CN101166059B CN 101166059 B CN101166059 B CN 101166059B CN 2007101657881 A CN2007101657881 A CN 2007101657881A CN 200710165788 A CN200710165788 A CN 200710165788A CN 101166059 B CN101166059 B CN 101166059B
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Abstract
This invention discloses a method for measuring time delay of fiber zoom out soft base stations automatically including: a soft base station transmits square wave signal to a base band process module of a large volume base station, receives square signals returned by the module, measures phase difference of transmitted and received signals and determines transmission time delay of circuits. This invention also discloses an automatic time delay measurement system for fiber zoom out soft base stations. The system adopts an automatic time delay compensation technology to measure different path delay of time caused by different length of fiber and adjust the path delay, so as to realize an synchronous transmission of each signal channel in an antenna aperture to synchronize the soft base station with the main base station and the whole network.
Description
This case is dividing an application of Chinese application case CN02112025.0, and the original bill applying date is 2002-06-11, and name is called: a kind of soft base station system and method for synchronous thereof based on fiber optic stretch.
Technical field
The present invention relates to signal cover and simultaneous techniques in the mobile communication network, relate in particular to a kind of optical fiber remote soft base station system and automatic time delay measurement method and system.
Background technology
At present; Mobile communications network on the problem of signal cover, the service coverage problem that also has coverage hole or shadow region and have some special areas such as the lower region of user density (like outlying mountain area), highway are along the line, conference centre, tunnel, tourist district.For addressing the above problem, except increasing the base station, utilize the repeater to enlarge the coverage of network signal at present, also be a kind of comparatively cost-effective means.The repeater can be carried out relaying amplification forwarding to travelling carriage that receives and signal of base station, and it is the equipment that a kind of cost is low, set up simply, have the small base station function.
According to the link mode between base station and the repeater, the CDMA repeater mainly is divided into RF direct amplifying station, microwave repeater, optical fiber repeater.The most akin with implementation of the present invention is optical fiber repeater.As shown in Figure 1, it is made up of proximal device 12 and remote equipment 13.Proximal device places donor base station 11 near-ends; To direct-coupled radiofrequency signal be light signal from the base station through the simulated light modulating transformation; Give remote equipment 13 through Optical Fiber Transmission, after remote equipment 13 converted light signal into the signal of telecommunication again, being radiated by service antenna needed region covered.Same, remote equipment 13 is also followed identical principle to the transmission of donor base station 11.
But optical fiber repeater has and adopts the optical cable remote transmission signal, does not have wireless discharging-directly station to receive the restriction of isolation, signal source and mounting condition, system stability, remote service sky line options plurality of advantages flexible and easy for installation.But there are following two shortcomings in optical fiber repeater:
1, the noise level of optical fiber repeater introducing and the reduction of receiving sensitivity
Adopt the repeater introduce noise level can for base station (alms giver), the noise penalty amount can cause that receiving sensitivity reduces.The repeater is as shown in Figure 2 with being connected of base station, and the A point is a reference point among the figure.
The white Gaussian noise of antenna inlet does
N
0＝KTB＝-113dBm(B＝1.23MHz)
Base station BTS 21 is at the thermal noise level of the reception at this confidential reference items examination point A place, sub-district
N
A/BTS＝N
0-L
DOUPLE-L
CABLE+G
LNA+NF
LNA
In the formula: L
CABLEFeeder loss
L
DOUPLEDuplexer/filter loss
G
LNAThe low noise amplifier gain
NF
LNAThe BTS receiver noise factor
After introducing the repeater, the repeater comprises near-end 22 and far-end 23, and base station BTS 21 is through the thermal noise level of sub-district, repeater in the reception at reference point A place
N
A/RPT＝N
0-L
COUPLE+G
R+NF
R
In the formula: L
COUPLECoupler loss
G
RRepeater reverse link overall gain
NF
RThe repeater receiver noise factor
Introduce the noise penalty amount brought behind the repeater promptly at total thermal noise power level of reference point A
N
A/T＝101g[anti(N
A/BTS)+anti(N
A/RPT)]
So, the reference point A in the base station, the difference of the noise level behind noise level that base station (alms giver) is own and the introducing repeater is (N
A/BTS-N
A/RPT).
The noise size that introduce the repeater and the L of repeater
COUPLE(coupler loss), G
R(repeater reverse link overall gain), NF
R(repeater receiver noise factor) is relevant.
According to " 800MHz CDMA repeater specification requirement and method of testing " standard code: repeater receiver noise factor, outdoor repeater≤5dB, indoor repeater≤6dB; Maximum gain≤113dB.
Difference (the N of reference point A in the base station
A/BTS-N
A/RPT) with the thermal noise deterioration amount certain relation is arranged.Visible according to above result of calculation, (N
A/BTS-N
A/RPT) corresponding certain thermal noise deterioration amount, can require to confirm that a base station can drive several optical fiber repeaters according to the surplus of the thermal noise of base station thus.
Even the repeater has reached the index that requires of standard code, generally speaking, noise can be raised about 3dB, and the sensitivity meeting reduces about 3dB.
Optical fiber repeater can adopt three kinds of networking modes usually: star-like, chain and tree type.Because what transmit on the optical fiber is analog signal, can introduce noise.Can know by above analysis, each base station be restricted with the quantity of optical fiber repeater, need multifiber as transfer resource during the optical fiber repeater chain networking in addition, greatly wasted fiber resource.
2, the delay problem of repeater
In CDMA Cellular System, a Pilot PN coded signal all will be launched in each base station or sector.The cycle of CDMA short code is MN=2
15=32768 chips.The PN bit rate is 1.2288MHz, and its width is Tc=1/1.2288=0.814us.M=512 sign indicating number skew arranged at most in the cdma system, and it is spaced apart the N=64 chip.Because travelling carriage is in different distance search base station pilot signal, the time system clock of base station and the time system clock of travelling carriage exist D chip delay, and D is the function of distance between base station and the travelling carriage.The geographical distribution meeting of travelling carriage makes travelling carriage time of origin skew when catching base station pilot signals, and travelling carriage possibly is used as the multipath signal reception to some pilot signal and cause pilot pollution to produce interference.When the planning base station pilot, designed the pilot signal searches window, solve location of mobile station uncertainty and The pilot pollution problem.The size of the search window of different offset code is different.
Because the repeater is the extension of donor base station, calculate between repeater and the base station apart from the time must consider the size of the search window of donor base station sign indicating number skew.
Make the search window of M pilot signal be ± D
MChip, the maximum delay between base station and the travelling carriage are D
MChip, the maximum service physical distance between base station and the travelling carriage
d(km)＝c*Tc*D
M，
D
M(us)＝c*Tc/d
The c=light velocity wherein
Tc＝0.814us/chip
According to " 800MHz CDMA repeater specification requirement and method of testing " standard code: propagation delay time is meant the time delay of output signal in repeater to input signal.
Optical fiber repeater≤5.0us
Make Te=5.0us (repeater equipment time delay)
Sc=c/1.46 (light velocity in optical cable) Dc=5us/km
Maximum delay between Dr=r/c repeater and the portable terminal, (r is the maximum service distance between repeater and the portable terminal)
D=Dc*H, H are the fiber lengths (km) of repeater to the base station
From the base station to the repeater maximum delay of the travelling carriage of the area of coverage (distance)
Dmax＝Te+D+Dr(us)
Dmax＜D
M
Te+Dc*H+Dr＜c*Tc/d
H(km)＜(c*Tc/d-Te-Dr)/Dc
This shows that there is the theoretic limit in optical fiber repeater to the distance of donor base station, when surpassing this limit (being generally about 10km), travelling carriage can't pass through the repeater access base station, thereby also can't obtain service.
Summary of the invention
In the technology to present signal cover; The existing shortcoming in repeater the objective of the invention is to propose a kind of soft base station system and method for synchronous thereof based on fiber optic stretch, through optical fiber big capacity signal of base station is transferred to soft base station; And be radiated by the service antenna of soft base station and need region covered; Solved the problem of caused noise in repeater and sensitivity, and the fiber optic stretch distance problem of being limited to, and utilize soft base station; Can increase power system capacity, and improve network quality through switching.
The present invention is achieved in that
A kind of soft base station system based on fiber optic stretch comprises a big capacity base station (central station) and several soft base stations.This soft base station is by transceiver (Transceiver; TRX) module, power amplifier module (HPA), RF front-end module, environment and HPA monitor module and power module are formed; Share baseband processing resource and master clock unit through optical fiber and dominant base, its role is to through optical fiber and digitalization radio frequency unit to be moved a big capacity base station (central station) to far-end and cover adjacent area on every side.For the soft base station system of forming through the optical fiber cascade between this soft base station and the big capacity base station, connected mode comprises star-like networking of TRX or the networking of TRX cascade.The operation principle of this soft base station system is that the digital baseband signal with big capacity base station is transformed to light signal; Give soft base station through Optical Fiber Transmission; Soft base station is a digital baseband signal with converting optical signals again; And said digital baseband signal is carried out Digital IF Processing become radiofrequency signal, being radiated by service antenna needs region covered.
The present invention adopts the star-like networking connected mode of TRX, is from the TRX module of some soft base stations, to be connected through the baseband processing unit of length different fibers with big capacity base station respectively.Adopting the networking of TRX cascade, is to link up far-end TRX level earlier, and the soft base station that will wherein be positioned at first place or position, end again is connected to the baseband processing unit of big capacity base station through an optical fiber.
Support the soft base station of the soft base station cascade or one 6 carrier wave of 6 single carriers on every optical fiber at the most; And distribute 6 Operation and Maintenance signalings and IQ data (being the base band data of two-way quadrature) logical channel, the operation maintenance data stream amount maximum of distributing on every optical fiber is no more than 0.7Mbps.
For multifiber, each road TRX data is to deliver to optical fiber separately after separately, and the TRX on the different fiber need not know the position of oneself; For the different TRX on the same optical fiber; Because TRX does not have the Address Recognition ability; The baseband processing module of big capacity base station is loaded into the configuration management data of each TRX on the optical fiber link according to slotted mode successively; Level each TRX on the connected link takes the data of certain time slot on optical fiber, and the data of the back time slot that moves forward successively, so just can realize that each TRX correctly gets the data of oneself.
A kind of method for synchronous of the soft base station system based on fiber optic stretch; To owing to having introduced the different propagation delay times that the different optical fiber of length brings; The present invention adopts the automatic delay compensation technique to measure the different path delays of time of causing owing to optical fiber length difference; And adjust this part path delay of time, thus realize each channel in the antenna opening synchronized transmissions, make soft base station and dominant base and the whole network synchronous.
The automatic delay compensation technique comprises Time delay measurement and time-delay adjustment.At first, send idle line of parallel port side-draw in the TRX of soft base station module and be used for the measuring route time-delay.On this root line, send the square wave that frequency is very low, this square wave is inserted in the baseband processing module that is sent to the base station in the serial data stream through after the parallel/serial conversion, and the transfer delay that is sent to baseband processing module is t1.Baseband processing module receives and carries out serial/parallel conversion behind this serial signal and recover this square-wave signal, and gets on the sendaisle that the square-wave signal that recovers feeds back to baseband processing module.This feedback signal carries out being inserted in the serial data stream after the parallel/serial conversion equally, and through the time delay transmission arrival TRX module of t2, the TRX module carries out recovering square-wave signal after the serial/parallel conversion to this signal again.The TRX module draws the transmission delay of circuit through the phase difference t (t=t1+t2) of square-wave signal that relatively sends and the square-wave signal that receives.If the transmission path of forward path and backward channel is all identical with transmission medium, then t1, t2 equate that one-way delay is 0.5t.Secondly, consider the constant time lag of serial/parallel conversion and parallel/serial conversion, add that in above-mentioned Time delay measurement result correction value revises this part time-delay, just can obtain precise results, but and above-mentioned measurement Real-time and Dynamic carry out, thereby reach synchronous purpose.And the time-delay adjustment is to use the variable length shift register to realize.
The TRX module of soft base station reports the process of Operation and Maintenance information and IQ data may further comprise the steps to the resource allocation plate of the baseband processing module of big capacity base station:
After the FPGA (Field Programmable Gate Array, field programmable gate array) of data on the TRX module of a. soft base station processor output handles, be inserted in the data flow of optical fiber through parallel serial conversion again;
B. after the data on the optical fiber passed on the resource allocation plate (RD), FPGA cut the data on the optical fiber get off, the data format when being reduced into TRX module transmission data.
RD is the inverse process of said process to the process that the TRX of soft base station module issues data, may further comprise the steps:
The data of exporting among the a.RD are inserted in the data flow of optical fiber through parallel serial conversion after FPGA handles again;
B. after the data on the optical fiber passed to the TRX module of soft base station, FPGA cut the data on the optical fiber get off, the data format when being reduced into RD transmission data.
Should between big capacity base station and soft base station, transmit IQ numeral debug signal based on the soft base station system of fiber optic stretch, and can not introduce noise through the fiber optic stretch mode.Each dominant base with the not restriction of quantity of soft base station, every road optical fiber can carry 6 tunnel soft base station signals at least, has avoided optical fiber repeater to monopolize optical fiber, has greatly improved the utilance of optical fiber.Automatically the compensated fiber propagation delay time guarantees that the whole network is accurately synchronous, and makes soft base station single-stage fiber optic stretch ultimate range can reach 40km.In addition, soft base station system is the same with ordinary base station, has the higher acceptance of sensitivity; The emission modulation accuracy is high, and the distortion factor is low; Can equally with management maintenance original service base station manage concentratedly and safeguard; Soft base station system has increased power system capacity when solving covering; The More Soft Handoff relation of soft base station coverage area and original service base station coverage area can avoid occurring coverage hole, and the 3dB that can make full use of soft handover gains and improves network quality, and reduces cutting off rate.
Soft base station system adopts the digital transceiver machine technology, and digital transceiver is mainly accomplished baseband filtering, equalization filtering, and Digital Up Convert, functions such as D/A conversion have solved the problems that the traditional analog transceiver exists, and remarkable advantages is following:
Reduce analog circuit, needed the link of adjusting few, be prone to realize digital tolerance adjustment;
Adopt digital filter to suppress spuious well and noise, can reduce performance requirement analog filter;
Total noise of centrifuge coefficient representative value can be reduced to 4dB, and the sensitivity representative value can reach-128dBm, can reduce transmission power of mobile station effectively, improves power system capacity;
Adopt digital equalising filtering can improve the waveform quality factor significantly, protocol requirement ρ＞0.912, the forward channel capacity can obviously be improved in actual measurement ρ＞0.997.
Description of drawings
Fig. 1, optical fiber repeater schematic diagram.
Fig. 2, repeater noise profile figure.
Fig. 3, soft base station system block diagram.
Fig. 4, the star-like networking diagram of TRX.
Fig. 5, soft architecture of base station block diagram.
Fig. 6, TRX forward path process chart.
Fig. 7, basic soft station system delay illustraton of model.
Fig. 8, Time delay measurement method figure.
The data format that Fig. 9, TRX plate send.
Data format (walks abreast) before Figure 10, the serialization.
Figure 11, TRX cascade networking mode figure.
Figure 12, " bubbling " mode realize Data Dynamic time slot transmission figure.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail.
Be illustrated in figure 3 as the soft base station system block diagram; This soft base station system comprises 31 and soft base stations 32 of a dominant base (being big capacity base station); Comprise baseband subsystems 311 in the dominant base 31, more comprise master clock unit 3111, resource allocation plate 3112 and baseband processing unit 3113 in the baseband subsystems 311.Master clock unit 3111 and baseband processing unit 3113 are shared with dominant base 31 in wherein soft base station 32, and resource allocation plate 3112 picks out optical fiber and links to each other with the transceiver 321 of soft base station 32.Soft base station 32 comprises digital transceiver (being the TRX module) 321, power amplifier module 322, RF front-end module 323, environment and HPA monitoring module 324 and power module 325.
The soft base station system of present embodiment comprises a big capacity base station and 6 soft base stations, and is as shown in Figure 4, and this soft base station system adopts the star-like networking structure of TRX.The TRX module 321 of each soft base station is connected with the baseband processing unit 3113 of this big capacity base station through the length different fibers respectively.Be illustrated in figure 5 as soft architecture of base station block diagram.This soft base station comprises digital TRX module 321, power amplifier module (HPA) 322, RF front-end module 323, environment and HPA monitoring module 324 and power module 325.Baseband processing resource and master clock unit are shared with big capacity base station in this soft base station.Soft base station system becomes light signal with the digital baseband signal of big capacity base station 31 through modulating transformation; Light signal is given soft base station through Optical Fiber Transmission; Soft base station converts light signal into digital baseband signal again; And with being transformed to radiofrequency signal after the said digital baseband signal process Digital IF Processing, being radiated by service antenna needs region covered.
Be illustrated in figure 6 as TRX forward path process chart, the light signal that comes out from base station controller reaches optical fiber through line interface, and through Time delay measurement, time-delay adjustment, again through signal processing, arrives radio frequency unit.
Be illustrated in figure 7 as base station system delay model figure.Because the different path delays of time that optical fiber length difference can cause, soft base station system adopts automatic delay backoff algorithm head it off.Because the different path delay that optical fiber length difference causes, and adjust this part time-delay through measuring, realize that each channel launches in antenna opening.
Be illustrated in figure 8 as the method for Time delay measurement, send idle line of parallel port side-draw in the TRX of soft base station module and be used for the measuring route time-delay.On this root line, send the square wave that frequency is very low, this square-wave cycle is 2S.This square wave is inserted in the baseband processing module that is sent to the base station in the serial data stream through after the parallel/serial conversion, and the transfer delay that is sent to baseband processing module is t1.Baseband processing module receives and carries out serial/parallel conversion behind this serial signal and recover this square-wave signal, and gets on the sendaisle that the square-wave signal that recovers feeds back to baseband processing module.This feedback signal carries out being inserted in the serial data stream after the parallel/serial conversion equally, and through the time delay transmission arrival TRX module of t2, the TRX module carries out recovering square-wave signal after the serial/parallel conversion to this signal again.The TRX module is through the square-wave signal that relatively the sends phase difference t with the square-wave signal that receives,
t＝t1+t2
Promptly draw the transmission delay of circuit.If forward path is all identical with transmission medium with the backward channel transmission path, then t1=t2 is the one-way transmission time-delay.Serial/parallel conversion and parallel/serial conversion also can bring time-delay, and this part time-delay is fixed, and not because of environment changes, add that in above-mentioned Time delay measurement result correction value revises this constant time lag, just can obtain accurate transmission delay.
After the transmission delay measurement finishes, again according to the numerical value of time-delay with the adjustment of delaying time of variable length shift register, thereby reach synchronous purpose.
The baseband processing module of big capacity base station is connected with TRX through resource allocation plate (RD), supports the soft base station of the soft base station cascade or one 6 carrier wave of 6 single carriers at the most on every optical fiber, and distributes 6 Operation and Maintenance signalings and IQ data logical channel.The operation maintenance data stream amount that can distribute on every optical fiber is to the maximum:
4.2/6＝0.7Mbps
Be convenient, the flow of operation maintenance information is taken as the half the of 1.2288M clock rate on every optical fiber:
1.2288/2＝0.6144Mbps
Can be with 6 TRX on every optical fiber at most, but then each TRX distribute data flow is:
0.6144/6＝0.1028Mbps
So be for the maximum stream flow of the Operation and Maintenance information of each TRX distribution: 102.8Kbps
The IQ data traffic of each TRX is 78.6432Mbps
The TRX module of soft base station reports the process of Operation and Maintenance information and IQ data may further comprise the steps to the resource allocation plate of baseband processing module:
The data format that the TRX plate sends is as shown in Figure 8, and wherein TS0 represents the data of first TRX, and TS1 represents the data of second TRX ..., total service data speed is 0.6144Mbps, and the IQ Data-carrying ability of 943.7184Mbps can be provided simultaneously.
The data of processor output are inserted in the data flow of optical fiber through parallel serial conversion after handling through the FPGA on the TRX plate.Data format before the serialization is shown in figure 10, and the data rate after optical fiber process string and the conversion is 122.88M, and is that 100fc is a frame, so frame rate is 1.2288M.After data on the optical fiber passed on the resource allocation plate (RD), FPGA cut the data on the optical fiber get off, and the data format when being reduced into TRX module transmission data is as shown in Figure 9.
The RD plate is the inverse process of said process to the process that TRX issues data, because the RD plate does not adopt broadcast mode to the data distributing of TRX plate, the data of every road TRX are delivered to optical fiber separately after separately, so the TRX on the different fiber need not know the position of oneself.RD is the inverse process of said process to the process that the TRX of soft base station module issues data, may further comprise the steps: the data of exporting among the RD are inserted in the data flow of optical fiber through parallel serial conversion after FPGA handles again; After data on the optical fiber passed to the TRX module of soft base station, FPGA cut the data on the optical fiber get off, the data format when being reduced into RD transmission data.
Shown in figure 11 is TRX cascade networking mode.This soft base station system comprises a big capacity base station and 6 soft base stations; Each soft base station is linked up through the optical fiber level; The soft base station that wherein is positioned at first place or position, end is connected through the baseband processing module of an optical fiber with big capacity base station, and this networking mode is compared with the star-like networking mode of TRX can save a large amount of optical fiber.
The structured flowchart of soft base station is identical with embodiment 1.
For the different TRX on the same optical fiber; Because TRX does not have the Address Recognition ability; TRX itself does not know to lay oneself open to the position in the chain, and present embodiment realizes that through " bubbling " mode the dynamic slot of data sends, and is shown in figure 12; The baseband processing module of big capacity base station is loaded into the configuration management data of each TRX on the optical fiber link according to slotted mode successively; Level each TRX on the connected link takes the data of 0 time slot on optical fiber, and the data of the back time slot that moves forward successively, so just can realize that each TRX correctly gets the data of oneself.
Claims (7)
1. an optical fiber remote soft base station automatic time delay measurement method is characterized in that, comprising:
Soft base station square wave signal is to the baseband processing module of big capacity base station;
Receive that the baseband processing module of big capacity base station returns square-wave signal;
Square-wave signal that measurement sends out and the square-wave signal phase difference that receives;
Confirm the propagation delay time of circuit according to the phase difference of measuring; Wherein
The transceiver T RX module of soft base station is inserted the baseband processing module that serial data stream sends to big capacity base station with square-wave signal through parallel/serial conversion;
The baseband processing module of big capacity base station receives said serial data stream, recovers square-wave signal through serial/parallel conversion, and this square-wave signal is inserted the TRX module that serial data stream sends to soft base station through parallel/serial conversion.
2. the method for claim 1 is characterized in that, when sending square-wave signal when identical with transmission medium with the transmission path that receives square-wave signal, propagation delay time is half of the phase difference that measures.
3. the method for claim 1 is characterized in that, the propagation delay time of circuit further comprises: the time delay that serial/parallel conversion and parallel/serial conversion bring.
4. like any described method of claim 1-3; It is characterized in that; Said method further comprises: the baseband processing module of big capacity base station is notified with the propagation delay time that obtains in soft base station, and the baseband processing module of big capacity base station is adjusted to realize synchronously time delay.
5. method as claimed in claim 4 is characterized in that: the baseband processing module of big capacity base station carries out the time delay adjustment through the variable length shift register.
6. an optical fiber remote soft base station automatic delay measuring system is characterized in that, comprising:
Soft base station is used for the baseband processing module of transmit square waves signal to big capacity base station; And the baseband processing module that receives big capacity base station return square-wave signal; Square-wave signal that measurement sends out and the square-wave signal phase difference that receives; Confirm the propagation delay time of circuit according to the phase difference of measuring;
The baseband processing module of big capacity base station is used to receive the square-wave signal that send soft base station, and said square-wave signal is returned said soft base station; Wherein
The transceiver T RX module of soft base station is inserted the baseband processing module that serial data stream sends to big capacity base station with square-wave signal through parallel/serial conversion;
The baseband processing module of big capacity base station receives said serial data stream, recovers square-wave signal through serial/parallel conversion, and this square-wave signal is inserted the TRX module that serial data stream sends to soft base station through parallel/serial conversion.
7. a soft base station is characterized in that, comprising:
First module is used for the baseband processing module of transmit square waves signal to big capacity base station;
Second module is used to receive the square-wave signal that the baseband processing module of big capacity base station returns;
Three module is used to measure square-wave signal that sends out and the square-wave signal phase difference that receives;
Four module is used for confirming according to the phase difference of measuring the propagation delay time of circuit; Wherein
The transceiver T RX module of soft base station is inserted the baseband processing module that serial data stream sends to big capacity base station with square-wave signal through parallel/serial conversion;
The baseband processing module of big capacity base station receives said serial data stream, recovers square-wave signal through serial/parallel conversion, and this square-wave signal is inserted the TRX module that serial data stream sends to soft base station through parallel/serial conversion.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021120250A CN100382470C (en) | 2002-06-11 | 2002-06-11 | Soft base station system based on fiber optic stretch and synchronous method thereof |
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| CNB021120250A Division CN100382470C (en) | 2002-06-11 | 2002-06-11 | Soft base station system based on fiber optic stretch and synchronous method thereof |
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| CN2007101657881A Expired - Lifetime CN101166059B (en) | 2002-06-11 | 2002-06-11 | An automatic time delay measurement method and system for optical fiber remote soft base station |
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| CN1241849A (en) * | 1998-03-25 | 2000-01-19 | 阿尔斯托姆英国有限公司 | Method for determining propagation delays and method for determining processor-clock drift in communications system |
| CN1351455A (en) * | 2000-10-26 | 2002-05-29 | 华为技术有限公司 | Power distribution method and equipment for broadband multi-carrier base station subsystem |
Also Published As
| Publication number | Publication date |
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| CN100382470C (en) | 2008-04-16 |
| CN1464666A (en) | 2003-12-31 |
| CN101166059A (en) | 2008-04-23 |
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