CN101814926B - Signal transmission device and method - Google Patents
Signal transmission device and method Download PDFInfo
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- CN101814926B CN101814926B CN 201010139123 CN201010139123A CN101814926B CN 101814926 B CN101814926 B CN 101814926B CN 201010139123 CN201010139123 CN 201010139123 CN 201010139123 A CN201010139123 A CN 201010139123A CN 101814926 B CN101814926 B CN 101814926B
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Abstract
The embodiment of the invention provides a signal transmission device and a signal transmission method for. The device comprises a signal sending device, a signal receiving device and a corresponding method. In a signal transmission scheme provided by the embodiment of the invention, frequency conversion processing is performed on a signal to be sent, so that the signal to be sent can be coupled to a coaxial cable and is sent in accompany with other signals of the coaxial cable; and the signal is restored in a signal receiving end through corresponding frequency conversion processing. The device and the method have the advantages of simple implementation, no need of the erection of a new optical fiber, no problem of maintaining the optical fiber, and improvement on the utilization rate of a conventional coaxial cable.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of signal transmitting apparatus and method.
Background technology
Development along with the communication technology, standardized base band-radio frequency interface is paid close attention to widely, in the numerous interface standards that in recent years, in succession occurred, common public radio interface (CPRI, Common Public Radio Interface) as the General Open interface standard, because the economical and convenient on it is realized has been subject in many ways supporting, product based on the CRPI consensus standard occurs in succession, and open general-purpose interface is saved cost, raising versatility and flexibility for the NodeB product convenience is provided.
Take BBU+RRU multichannel solution as example, what this scheme was just used is the CPRI interface.Usually the interlayer of building inside has floor, and there is wall in the room, has living space between the indoor and outdoor user and cuts apart, and the BBU+RRU Multi channel utilizes this characteristic exactly.Large-scale stadium for surpassing 100,000 square metres can be divided into grandstand several residential quarters, and each residential quarter arranges several passages, the corresponding plate antenna of each passage.
The BBU+RRU scheme adopts the distribution mode of Optical Fiber Transmission.Baseband processing unit (BBU, Base Band Unit) is concentrated and is placed on machine room, and far-end RF module (RRU, Remote Radio Unit) can be mounted to floor, adopts Optical Fiber Transmission between BBU and the RRU.For down direction: optical fiber is directly linked RRU from BBU, what transmit between BBU and the RRU is baseband digital signal, the base station signal that can control certain user is launched from the RRU passage of appointment like this, can greatly reduce like this interference to user on other passages of this residential quarter.For up direction: the user mobile phone signal is received by nearest passage, then passes to the base station from this passage through optical fiber, so also can greatly reduce the interference between the user on the different passages.
The BBU+RRU scheme is very flexible for capacity configuration, and demand under the prerequisite that does not change RRU and indoor distributed system, is supported the dilatation of every passage from 1/6 carrier wave to 3 carrier waves by disposing BBU by measure.
The inventor finds by the research to prior art, in the existing BBU+RRU scheme, adopt fiber direct connection between BBU and the RRU, need extra fiber plant, and the increase photoelectric conversion unit, and optical fiber is easier to damage, and needs to adopt armouring, so existing BBU+RRU scheme construction is complicated, maintenance load is heavy.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of signal transmitting apparatus and method, realizes utilizing coaxial cable that signal is transmitted.
For achieving the above object, the embodiment of the invention provides following technical scheme:
A kind of sender unit comprises: accompaniment signal frequency determining unit, transmission frequency determining unit, the first converter unit, and the first local oscillator unit, the first local oscillator control unit, the first local oscillator lock unit, wherein:
Described accompaniment signal frequency determining unit is at least one reference frequency of determining to follow with signal to be sent on the coaxial cable transmission;
Described transmission frequency determining unit is for the transmission frequency of determining described signal to be sent according to the original frequency of described reference frequency and described signal to be sent;
Described the first local oscillator control unit is used for according to the original frequency of described transmission frequency and described signal to be sent described the first local oscillator unit being controlled;
Described the first local oscillator unit is used for configuration the first local oscillator radiofrequency signal under the control of described the first local oscillator control unit;
Described the first local oscillator lock unit is used for described the first local oscillator unit is carried out synchronously;
The first converter unit is used for utilizing described the first local oscillator radiofrequency signal that described signal to be sent is sent from being coupled to described coaxial cable after original frequency is converted to described transmission frequency.
A kind of signal receiving device comprises: original frequency determining unit, the second converter unit, and the second local oscillator unit, the second local oscillator control unit, the second local oscillator lock unit, wherein:
Described original frequency determining unit is for the original frequency of the signal of determining to receive;
Described the second local oscillator control unit, be used for according to transmission frequency and the described original frequency of the signal that receives described the second local oscillator unit being controlled, wherein, described transmission frequency is to determine that according to reference frequency and described original frequency described reference frequency is to follow at least one reference frequency of transmission on the coaxial cable with signal to be sent;
The second local oscillator unit is used for configuration the second local oscillator radiofrequency signal under the control of described the second local oscillator control unit;
Described the second local oscillator lock unit is used for described the second local oscillator unit is carried out synchronously;
The second converter unit is used for utilizing described the second local oscillator radiofrequency signal that the signal that receives is converted to described original frequency and reception from transmission frequency.
A kind of signaling method comprises:
Determine to follow with signal to be sent on the coaxial cable at least one reference frequency of transmission;
Determine the transmission frequency of described signal to be sent according to the original frequency of described reference frequency and described signal to be sent;
Original frequency according to described transmission frequency and described signal to be sent disposes the first local oscillator radiofrequency signal;
Utilize described the first local oscillator radiofrequency signal that described signal to be sent is sent from being coupled to described coaxial cable after original frequency is converted to described transmission frequency.
A kind of signal acceptance method comprises:
The original frequency of definite signal that receives;
Transmission frequency and described original frequency according to the signal that receives dispose the second local oscillator radiofrequency signal, wherein, described transmission frequency is to determine that according to reference frequency and described original frequency described reference frequency is to follow at least one reference frequency of transmission on the coaxial cable with signal to be sent;
Utilize described the second local oscillator radiofrequency signal that the signal that receives is converted to described original frequency and reception from transmission frequency.
As seen, the side signal transmission case that the embodiment of the invention provides is by after treating transmitted signal and carrying out frequency-conversion processing, so that signal to be sent can be coupled on the coaxial cable with this coaxial cable on other signals follow transmission, and at signal receiving end, by corresponding frequency-conversion processing, signal is reduced, realize simple, need not to set up new optical fiber, also do not deposit the problem that optical fiber is safeguarded, improved the utilance to existing coaxial cable.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, the accompanying drawing that the following describes only is some embodiment that put down in writing among the application, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The structural representation that installs that Fig. 1 provides for one embodiment of the invention;
Fig. 2 is the square structure schematic diagram of another device that one embodiment of the invention provides;
The structural representation of the device that Fig. 3 provides for another embodiment of the present invention;
The structural representation of another device that Fig. 4 provides for another embodiment of the present invention;
Fig. 5 is the structural representation of the device in one embodiment of the invention one application scenarios;
Fig. 6 is the structural representation of the device of one in one embodiment of the invention Another Application scene;
The flow chart of the method that Fig. 7 provides for one embodiment of the invention;
The flow chart of the method that Fig. 8 provides for another embodiment of the present invention.
Embodiment
In order to make those skilled in the art person understand better technical scheme among the application, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment only is the application's part embodiment, rather than whole embodiment.Based on the embodiment among the application, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all should belong to the scope of the application's protection.
Referring to Fig. 1, a kind of sender unit that one embodiment of the invention provides, this device comprises: accompaniment signal frequency determining unit 101, transmission frequency determining unit 102, the first converter unit 103, the first local oscillator unit 104, the first local oscillator control unit 105, wherein:
Described accompaniment signal frequency determining unit 101 is at least one reference frequency of determining to follow with signal to be sent on the coaxial cable transmission;
Described transmission frequency determining unit 102 is for the transmission frequency of determining described signal to be sent according to the original frequency of described reference frequency and described signal to be sent;
Signal to be sent will be followed transmission at coaxial cable with accompaniment signal, follow in the transmission course each other interference for fear of signal, also will consider a safe isolation frequency band on the basis of reference frequency.Safe isolation frequency band forms the isolated area of an accompaniment signal and signal to be sent, avoids the phase mutual interference of these two signals.The width of this safe isolation frequency band can determine that the present invention can not do restriction according to actual conditions.
Can determine the harmonic wave scope of signal to be sent according to the original frequency of signal to be sent.
After having determined the harmonic wave scope of the safe isolation frequency band of the reference frequency of accompaniment signal and accompaniment signal and signal to be sent and signal to be sent, just the transmission frequency of signal to be sent can have been determined.
In general, if the reference frequency of accompaniment signal is lower, can treats transmitted signal and do upconversion process, for example, add that on the basis of reference signal the resulting value of safe isolation frequency band can be used as minimum transmission frequency; The harmonic wave scope of adding signal to be sent on minimum transmission frequency basis just can obtain the highest transmission frequency of signal to be sent.
If the reference frequency of accompaniment signal is higher, can treat transmitted signal and do down-converted, for example, deduct the resulting value of safe isolation frequency band on the basis of reference signal and can be used as the highest transmission frequency; The harmonic wave scope that deducts again signal to be sent on the highest transmission frequency basis just can obtain the minimum transmission frequency of signal to be sent.
Described the first local oscillator control unit 105 is used for according to the transmission frequency of described signal to be sent and the original frequency of described signal to be sent described the first local oscillator unit being controlled;
The described local oscillator unit is controlled namely forms the parameter that disposes the first local oscillator radiofrequency signal according to the transmission frequency of signal to be sent and the original frequency of signal to be sent, prepares for disposing the first local oscillator radiofrequency signal.The parameter that disposes the first local oscillator radiofrequency signal comprises the local frequency of the first local oscillator radiofrequency signal can also comprise safe isolation frequency band etc.
Described the first local oscillator unit 104 is used for configuration the first local oscillator radiofrequency signal under the control of described the first local oscillator control unit;
The first converter unit 103 is used for utilizing described the first local oscillator radiofrequency signal that described signal to be sent is sent from being coupled to described coaxial cable after original frequency is converted to described transmission frequency.Be understandable that, described signal to be sent can be followed transmission with other signals on coaxial cable here.
In the practical application, the power supply of described the first converter unit 103 can be directly obtained by the feed of cable.
Embodiment of the invention institute generator can utilize coaxial cable that the signal between BBU and the RRU is transmitted, and is understandable that, the coaxial cable that utilizes can be existing coaxial cable, can limit in embodiments of the present invention.Particularly, determine that according to described accompaniment signal frequency determining unit the transmission frequency of the accompaniment signal on the coaxial cable is as the reference frequency of signal to be sent, determine the transmission frequency that signal to be sent can be when this coaxial cable carries out safe transmission by the transmission frequency determining unit according to the original frequency of reference frequency and described signal to be sent again, at last, by the first converter unit signal to be sent being converted to transmission frequency by primary signal sends, with guarantee signal with coaxial cable on other signals interference-free when following transmission, and in order to realize effective frequency conversion, the device that the embodiment of the invention provides is combined into this first local oscillator cell location first local oscillator radiofrequency signal by the first local oscillator control unit and the first local oscillator lock unit condition is provided, further guarantee the smooth realization of frequency conversion, thereby guaranteed the realization that signal sends.
Preferably, in another embodiment of the present invention, in order to guarantee to receive the receiving end exactly through the signal after the frequency conversion, sender unit shown in Figure 1 can also comprise:
The first local oscillator lock unit 106 is used for described the first local oscillator unit is carried out synchronously.Particularly, described the first local oscillator lock unit provides a synchronizing signal for described the first local oscillator unit, clock signal for example, and the first local oscillator unit produces the local oscillator radiofrequency signal according to this clock signal.
Further, signal receiving end can produce according to the synchronizing signal identical with signal receiving end the local oscillator radiofrequency signal of signal receiving end.The first local oscillator lock unit can directly be sent to signal receiving end with this synchronizing signal, so that the same synchronizing signal of signal receiving end utilization produces the local oscillator radiofrequency signal of receiving terminal; The first local oscillator lock unit also can be incorporated this clock signal in the middle of the signal that this sender unit sends, be sent to signal receiving end with this signal, after signal receiving end receives signal, from this signal, synchronizing signal is recovered, and then utilize this synchronizing signal to produce the local oscillator radiofrequency signal of receiving terminal.In the some embodiments of the present invention, can by directly realizing the function of local oscillator lock unit for signal sending end and signal receiving end provide the mode of identical synchronizing signal, can this not done restriction in the embodiment of the invention yet.
Referring to Fig. 2, in order to make the better quality of the signal that sends, the embodiment of the invention also provides another kind of sender unit, and this device has increased newly on the basis of device shown in Figure 1: low pass filter 107, amplifier 108 and high pass filter 109, wherein:
Signal to be sent is by the input input of described low pass filter 107, and 107 pairs of described signals to be sent of described low pass filter carry out low-pass filtering treatment; The output of described low pass filter 107 links to each other with the input of described the first converter unit 103; The output of described the first converter unit 103 links to each other with the input of amplifier 108, and this amplifier amplifies processing to the signal of its input; The output of described amplifier 101 links to each other with the input of described high pass or band pass filter 109, and the signal of high pass or 109 pairs of inputs of band pass filter carries out high pass or bandpass filtering treatment; Signal is coupled on the described coaxial cable by the input of described high pass or band pass filter 109.
Need to prove that in the other embodiments of the invention, this high pass filter 109 also can be realized by band pass filter, as long as can reach the signal that filters out corresponding band.
In other embodiments of the invention, this sender unit can also comprise: difference turns single-end circuit, signal to be sent turns the input of single-end circuit input by described difference, and the output that described difference turns single-end circuit links to each other with the input of described low pass filter.It is single-end circuit for circuit conversion that this difference turns single-end circuit.In the practical application, part amplifying circuit or converter unit all are single-ended structure, can turn single-end circuit by difference circuit conversion is adapted to the single-end circuit structure.
The sender unit that the embodiment of the invention provides is at first treated transmitted signal and is carried out preliminary treatment, for example signal is inputted the low-pass filtering treatment of doing before the first converter unit, after the first converter unit carries out frequency-conversion processing to signal, signal has been carried out amplifying processing, improved the stability of signal, after amplifying processing, again this signal coupling also high pass or bandpass filtering treatment had been carried out to signal to coaxial cable, further remove the noise in the signal, guaranteed the quality of the signal that is coupled, so that the device that the embodiment of the invention provides is utilizing coaxial cable to carry out having improved further when signal sends the quality of the signal that sends.
Referring to Fig. 3, a kind of signal receiving device also is provided in another embodiment of the present invention, this device comprises: original frequency determining unit 301, the second converter unit 302, the second local oscillator unit 303, the second local oscillator control unit 304, wherein:
Described original frequency determining unit 301 is for the original frequency of the signal of determining to receive;
Described the second local oscillator control unit 304 is used for according to transmission frequency and the described original frequency of the signal that receives described the second local oscillator unit being controlled;
The second local oscillator unit 303 is used for configuration the second local oscillator radiofrequency signal under the control of described the second local oscillator control unit;
The second converter unit 302 is used for utilizing described the second local oscillator radiofrequency signal that the signal through the coaxial cable transmission that receives is converted to described original frequency and reception from transmission frequency.
Preferably, in another embodiment of the present invention, in order to guarantee to be received by signal receiving device shown in Figure 3 exactly at the signal of signal sending end after frequency conversion, signal receiving device shown in Figure 3 can also comprise the second local oscillator lock unit 305, is used for described the second local oscillator unit 303 is carried out synchronously; Specifically can comprise, if the first local oscillator lock unit of signal sending end directly is sent to signal receiving end with synchronizing signal, then this second local oscillator lock unit directly receives this synchronizing signal, and this synchronizing signal offered the second local oscillator unit, so that second this synchronizing signal of local oscillator unit by using produces the second local oscillator radiofrequency signal; If the synchronizing signal of transmitting terminal is to be blended in the signal that transmitting terminal sends to send to signal receiving end, the second local oscillator lock unit need to recover this synchronizing signal from the signal that receives so, this synchronizing signal is offered the second local oscillator unit, so that second this synchronizing signal of local oscillator unit by using produces the second local oscillator radiofrequency signal.If among a certain embodiment, directly the local oscillator unit for transmitting terminal and receiving terminal provides identical synchronizing signal, and the second local oscillator unit further directly utilizes this synchronizing signal to produce the second local oscillator radiofrequency signal so.Can this not done restriction in the embodiment of the invention.
The device that the embodiment of the invention provides is mainly used to receive through being coupling in the signal on the coaxial circuit after the frequency-conversion processing.Because being coupling in the signal of following transmission on the coaxial cable does not send according to the primary signal frequency, so need to reduce accordingly to the signal after receiving processing, specifically comprise: the original frequency of at first determining the signal that receives by original frequency determining unit 301, behind the original frequency of the signal of determining to receive, the second local oscillator unit 303 disposes the second local oscillator radiofrequency signal according to transmission frequency and the described original frequency of the signal that receives; The second converter unit 302 utilizes this second local oscillator radiofrequency signal that the signal that receives is converted to described original frequency from transmission frequency, wherein, the second local oscillator control unit 304 and the second local oscillator lock unit 305 are configured and Synchronization Control the second local oscillator unit respectively, so that described the second local oscillator unit 303 can dispose the second local oscillator radiofrequency signal for described the second converter unit 302.The signal that the device that the embodiment of the invention provides will be coupling on the coaxial cable reverts back original signal, has guaranteed being received exactly after the signal of following other is by the coaxial cable transmission of signal, has guaranteed the accuracy of signal transmission.
In order to improve the quality of the signal that receives, in another embodiment of the present invention, the present invention also provides another kind of signal receiving device, referring to Fig. 4, this device also comprises on the basis of device shown in Figure 3: high pass filter 306, amplifier 307 and low pass filter 308, wherein:
The signal that receives is by the input input of described high pass filter 306, and the signal of 306 pairs of receptions of this high pass filter carries out high-pass filtering to be processed; The output of described high pass filter 306 links to each other with the input of described amplifier 307, and 307 pairs of signals after high-pass filtering is processed of described amplifier amplify processing; The output of described amplifier 307 links to each other with the input of described the second converter unit 305; The output of described the second converter unit 305 links to each other with the input of described low pass filter 308.Finally being returned the signal of original frequency by frequency conversion can be by the output of the output of this low pass filter 308.
Among other embodiment of the present invention, this signal receiving device can also comprise: the single-ended transfer difference circuit, the output 308 of described low pass filter links to each other with the input of described single-ended transfer difference circuit, finally returned the signal of original frequency by the output output of described single-ended transfer difference circuit by frequency conversion, this single-ended transfer difference circuit carries out single-ended transfer difference to the received signal to be processed, and converts single-ended signal to differential signal and sends.
The device that the embodiment of the invention provides is on the basis of embodiment shown in Figure 3, the treatment circuits such as filter circuit, amplifying circuit have been increased, so that the signal that receives is after being sent to receiving terminal by coaxial cable, can be by on the basis that is correctly received after the process frequency conversion, by filter circuit, amplifying circuit etc. circuit signal is processed, made the quality of the signal that receives that further raising arranged.
Those skilled in the art can know, the signaling method that the embodiment of the invention provides and signal acceptance method for signal, rather than for some equipment, same equipment, both transmitted signal received again signal.
The below is described in detail the method that the embodiment of the invention was provided with the sending and receiving process of parallel series and staticizer (SERDES) signal in the BBU+RRU scheme.
Fig. 5 is the SERDES signal is sent to RRU by coaxial cable from BBU process.In this process, the BBU end has sender unit for the SERDES signal sending end, and the RRU end is to have signal receiving device by the SERDES signal receiving end.In the practical application, the speed of the SERDES signal of BBU output is 1.288Gbps(speed unit) situation under, the harmonic wave major part is at the 2.5GHz(cps) in.In order to guarantee that this signal can correctly recover, to transmit at least the signal of 2.5GHz.In the embodiment of the invention, this SERDES signal and CDMA signal are followed transmission at coaxial cable, and the transmission frequency of CDMA signal is 880MHz, and the accompaniment signal determining unit 5014 in the sender unit 501 among Fig. 5 determines that reference frequency is 880MHz.In order to guarantee that signal can normally be recovered after following transmission, transmission frequency determining unit 5015 determines that according to the original frequency of this reference frequency and described signal to be sent the transmission frequency of signal to be sent in the embodiment of the invention is between the 3.5G-6G.In fact, in the embodiment of the invention, the first converter unit in the signal transmitting unit is treated transmitted signal and is done upconversion process, institute thinks the up-conversion unit, correspondingly, the second converter unit of signal receiving end is done down-converted to the signal that receives, and is down-converter unit.
As shown in Figure 5, the SERDES signal of BBU output is coupled on the coaxial cable by sender unit 501, sends to RRU after coaxial cable is received by the signal receiving device 502 that is positioned at the RRU end again.Wherein, a microcontroller (MCU is respectively arranged in this sender unit 501 and the signal receiving device 502, Micro Controller Unit), is designated as a MCU5016 and the 2nd MCU5026, respectively the first local oscillator unit 5012 and the second local oscillator unit 5022 controlled.In order to guarantee that sender unit and signal receiving device can correctly carry out the sending and receiving of signal, the first local oscillator unit 5012 in the embodiment of the invention in sender unit 501 and the signal receiving device 502 and the second local oscillator unit 5022 need synchronously.In the embodiment of the invention by 10MHz as the local oscillator reference synchronization, realize the first local oscillator lock unit in sender unit and the signal receiving device and the function of the second local oscillator lock unit.The embodiment of the invention is not done restriction to concrete local oscillator reference synchronization, can choose according to actual conditions in the practical application.
The one MCU5016 controls the first local oscillator unit 5012 configurations the first local oscillator radiofrequency signal according to the transmission frequency of signal to be sent, in the embodiment of the invention, this the first local oscillator radiofrequency signal can be 6GHz, upconverter 5013 can utilize this first local oscillator radiofrequency signal with SERDES signal up-conversion between the 3.5-6GHz, be transferred to the signal receiving device 502 of RRU side by coaxial cable, the original frequency determining unit 5021 of signal receiving device 502 determines that at first the original rate of the signal that receives is 1.288Gbps, then the 2nd MCU5026 of this signal receiving device 502 controls the second local oscillator unit 5022 configurations the second local oscillator radiofrequency signal according to transmission frequency and the original frequency of the signal that receives, such as, in the embodiment of the invention, this second local oscillator radiofrequency signal can be 6GHz; This signal receiving device 502 utilizes 5023 pairs of these signals of low-converter to carry out down-converted, and the signal after the down-conversion is carried out sending to RRU after the equilibrium.
So far, the scheme that the embodiment of the invention provides is by increasing sender unit and signal receiving device in BBU side and RRU side respectively, realized the process of utilizing coaxial cable that the SERDES signal is sent between BBU and the RRU, because the accompaniment signal transmission is arranged on this coaxial cable, so in the embodiment of the invention need to and accompaniment signal follow that to reduce the signal that the signal that existed transmits between to BBU and RRU when sending interference-free as far as possible, also to avoid the decay of signal in transmission course simultaneously as far as possible, so the dispensing device that the embodiment of the invention provides is by accompaniment signal frequency determining unit and transmitted signal determining unit, determine the transmission frequency of signal to be sent according to the accompaniment signal on the coaxial cable, and utilize local oscillation circuit to treat transmitted signal and carry out frequency-conversion processing, with signal frequency conversion to be sent to frequency range corresponding to transmission frequency; Correspondingly, receiving system reverts back original frequency with signal, thereby has realized the process of the signal send and receive between BBU and the RRU in the corresponding frequency-conversion processing of receiving terminal institute.
When the SERDES signal was sent to BBU from RRU by coaxial cable, the RRU end had sender unit for the SERDES signal sending end, and the BBU end is to have signal receiving device by the SERDES signal receiving end; Those skilled in the art can know that transmitting terminal all is relative with receiving terminal, and just transmit leg and recipient's main body change, but the process that signal is processed is basic identical, can referring to Fig. 5, repeat no more herein.
The scheme that the embodiment of the invention provides can also be supported PCI Express, XAUI, Serial RapidIO, the agreements such as SONET/SDH.Be that the scheme that the embodiment of the invention provides not only can be applied to wireless network, also can be applied in medium other networks of fixed network.
The BBU that Fig. 6 provides for another embodiment of the present invention and the uplink downlink structural representation among the RRU.Mainly comprise four modules among the figure, be respectively first signal sending module 601 and secondary signal sending module 603, first signal receiver module 602 and secondary signal receiver module 604.In the embodiment of the invention, synchronous in order to guarantee local oscillator, so local oscillator unit 6051 and 6052 is interrelated, wherein, local oscillator unit 6051 provides the local oscillator radiofrequency signal for signal transmitting module 601 and signal receiving module 604, and local oscillator unit 6052 provides the local oscillator radiofrequency signal for signal receiving module 602 and signal transmitting module 603.
First signal sending module 601 is identical with secondary signal sending module 603 structures, first signal receiver module 602 is identical with secondary signal receiver module 604 structures, and the below as an example of first signal sending module 601 and secondary signal receiver module 604 example the signal that the embodiment of the invention was provided is sent and signal receiving device is elaborated.
First signal sending module 601 is in fact mainly realized the upconversion process of the signal of SERDES signal TX output.Among the embodiment shown in Figure 6, determined the frequency to be sent of signal to be sent by the accompaniment signal frequency determining unit in the sender unit and transmission frequency determining unit, simultaneously, the frequency range of signal demand up-conversion to be sent has been determined in the up-conversion unit, at this moment, the upconversion process flow process comprises: difference turns single-ended → low-pass filtering → up-conversion → amplification → high pass filter → be coupled to coaxial cable, be specially: will carry out difference from the signal that SERDES signal TX port sends and turn single-ended processing, utilize low-pass filtering 6011 devices that this signal is carried out low-pass filtering, the radiofrequency signal that upconverter 6012 utilizes local oscillator unit 6051 to provide is carried out upconversion process to filtered signal, signal after 6013 pairs of up-conversions of amplifier amplifies, signal after 6014 pairs of amplifications of high pass or band pass filter carries out filtering to be processed, then with this signal coupling to coaxial cable.
Secondary signal receiver module 604 is in fact mainly realized the down-converted of the signal that SERDES signal RX receives.Among the embodiment shown in Figure 6, determined the original frequency of the signal that receives by the described original frequency determining unit in the signal receiving device, simultaneously, down-converter unit has been determined the frequency range of the signal demand down-conversion that receives, at this moment, the down-converted flow process comprises: separate coupling → high pass filter → amplification → down-conversion → low-pass filtering → single-ended transfer difference, be specially: will follow the SERDES signal of transmission to separate coupling from coaxial cable at coaxial circuit, utilizing 6041 pairs of signals of separating after being coupled of high pass filter to carry out high-pass filtering processes, signal after 6042 pairs of high-pass filterings of amplifier amplifies processing, the radiofrequency signal that low-converter 6043 utilizes local oscillator unit 6051 to provide is carried out down-converted to the signal after amplifying, signal after 6044 pairs of down-conversions of low pass filter carries out low-pass filtering treatment, then signal is sent to the BBU-RX port.
The embodiment of the invention realizes signal transmission two-way between BBU and the RRU for the scheme that BBU and RRU provide by coaxial cable, realize simple, need not to set up new optical fiber, also need not problem that optical fiber is safeguarded, can improve the utilance to existing coaxial cable.
Referring to Fig. 7, another embodiment of the present invention also provides a kind of signaling method, and the method comprises:
S701, determine to follow with signal to be sent on the coaxial cable at least one reference frequency of transmission;
S702, determine the transmission frequency of described signal to be sent according to the original frequency of described reference frequency and described signal to be sent;
S703, dispose the first local oscillator radiofrequency signal according to the transmission frequency of described signal to be sent and the original frequency of described signal to be sent;
S704, utilize described the first local oscillator radiofrequency signal that described signal to be sent is sent from being coupled to described coaxial cable after original frequency is converted to described transmission frequency.
Preferably, in order to improve the quality of the signal that sends, in another embodiment of the present invention, utilize described the first local oscillator radiofrequency signal that described signal to be sent can also be comprised before original frequency is converted to described transmission frequency:
Described signal to be sent is carried out low-pass filtering treatment.
Preferably, after utilizing described the first local oscillator radiofrequency signal that described signal to be sent is converted to described transmission frequency from original frequency, before described signal coupling to be sent sent to the described coaxial cable, can also comprise:
Described signal to be sent is amplified and high pass or bandpass filtering treatment.
Embodiment of the invention institute supplying method utilizes coaxial cable that the signal between BBU and the RRU is transmitted, particularly, can determine that the transmission frequency of other signals on the coaxial cable is as the reference frequency of signal to be sent, determine the transmission frequency that signal to be sent can be when this coaxial cable carries out safe transmission according to the original frequency of reference frequency and described signal to be sent again, at last, utilizing the first local oscillator radiofrequency signal that signal to be sent is converted to transmission frequency by primary signal sends, can guarantee signal with coaxial cable on accompaniment signal follow when transmission interference-free, thereby guaranteed the realization that signal sends.
Referring to Fig. 8, another embodiment of the present invention also provides a kind of signal acceptance method, and the method comprises:
The original frequency of S801, definite signal that receives;
S802, dispose the second local oscillator radiofrequency signal according to the transmission frequency of the signal that receives and the original frequency of the described signal that receives;
S803, utilize described the second local oscillator radiofrequency signal that the signal that receives is converted to described original frequency and receives from transmission frequency.
Preferably, in one embodiment of the invention, utilize before described the second local oscillator radiofrequency signal is converted to described original frequency with the signal that receives from transmission frequency, can also comprise:
The signal that receives is carried out high pass (perhaps band is logical) filtering and amplifies processing.
Preferably, in another embodiment of the present invention, utilize described the second local oscillator radiofrequency signal with the signal that receives after transmission frequency is converted to described original frequency, can also comprise:
The signal that receives is carried out low-pass filtering treatment.
The method that the embodiment of the invention provides is mainly used to receive through being coupling in the signal on the coaxial circuit after the frequency-conversion processing.Because being coupling in the signal of following transmission on the coaxial cable does not send according to the primary signal frequency, so need to reduce accordingly to the signal after receiving processing, specifically comprise: the at first logical original frequency of determining the signal that receives, behind the original frequency of the signal of determining to receive, dispose the second local oscillator radiofrequency signal according to transmission frequency and the described original frequency of the signal that receives; Utilize this second local oscillator radiofrequency signal that the signal that receives is converted to described original frequency from transmission frequency.The method that the embodiment of the invention provides will be coupling on the coaxial cable signal also original position return original signal, guaranteed being received exactly by after the coaxial cable transmission at the signal of following other of signal, guaranteed the accuracy of signal transmission.
The present invention can describe in the general context of the computer executable instructions of being carried out by computer, for example program module.Usually, program module comprises the routine carrying out particular task or realize particular abstract data type, program, object, assembly, data structure etc.Also can in distributed computing environment (DCE), put into practice the present invention, in these distributed computing environment (DCE), be executed the task by the teleprocessing equipment that is connected by communication network.In distributed computing environment (DCE), program module can be arranged in the local and remote computer-readable storage medium that comprises memory device.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a sender unit is characterized in that, comprising: accompaniment signal frequency determining unit, transmission frequency determining unit, the first converter unit, and the first local oscillator unit, the first local oscillator control unit, the first local oscillator lock unit, wherein:
Described accompaniment signal frequency determining unit is at least one reference frequency of determining to follow with signal to be sent on the coaxial cable transmission;
Described transmission frequency determining unit is for the transmission frequency of determining described signal to be sent according to the original frequency of described reference frequency and described signal to be sent;
Described the first local oscillator control unit is used for according to the original frequency of described transmission frequency and described signal to be sent described the first local oscillator unit being controlled;
Described the first local oscillator unit is used for configuration the first local oscillator radiofrequency signal under the control of described the first local oscillator control unit;
The first converter unit is used for utilizing described the first local oscillator radiofrequency signal that described signal to be sent is sent from being coupled to described coaxial cable after original frequency is converted to described transmission frequency.
2. device according to claim 1 is characterized in that, also comprises: low pass filter, amplifier and high pass or band pass filter, wherein:
Signal to be sent is by described low pass filter input input, and the output of described low pass filter links to each other with described the first converter unit input; Described the first converter unit output links to each other with the input of described amplifier, and the output of described amplifier links to each other with the input of described high pass or band pass filter, and signal is coupled on the described coaxial cable by the input of described high pass or band pass filter.
3. device according to claim 2 is characterized in that, also comprises: difference turns single-end circuit, and signal to be sent turns the input of single-end circuit input by described difference, and the output that described difference turns single-end circuit links to each other with the input of described low pass filter.
4. a signal receiving device is characterized in that, comprising: original frequency determining unit, the second converter unit, and the second local oscillator unit, the second local oscillator control unit, the second local oscillator lock unit, wherein:
Described original frequency determining unit is for the original frequency of the signal of determining to receive;
Described the second local oscillator control unit, be used for according to transmission frequency and the described original frequency of the signal that receives described the second local oscillator unit being controlled, wherein, described transmission frequency is to determine that according to reference frequency and described original frequency described reference frequency is to follow at least one reference frequency of transmission on the coaxial cable with signal to be sent;
The second local oscillator unit is used for configuration the second local oscillator radiofrequency signal under the control of described the second local oscillator control unit;
The second converter unit is used for utilizing described the second local oscillator radiofrequency signal that the signal that receives is converted to described original frequency and reception from transmission frequency.
5. device according to claim 4 is characterized in that, also comprises: high pass filter, amplifier and low pass filter, wherein:
The signal that receives is by described high pass filter input input, and the output of described high pass filter links to each other with the input of described amplifier, and the output of described amplifier links to each other with described the second converter unit input; Described the second converter unit output links to each other with the input of described low pass filter.
6. device according to claim 5, it is characterized in that, also comprise: the single-ended transfer difference circuit, the output of described low pass filter links to each other with the input of described single-ended transfer difference circuit, and the signal that receives is through the output output of described single-ended transfer difference circuit.
7. a signaling method is characterized in that, comprising:
Determine to follow with signal to be sent on the coaxial cable at least one reference frequency of transmission;
Determine the transmission frequency of described signal to be sent according to the original frequency of described reference frequency and described signal to be sent;
Dispose the first local oscillator radiofrequency signal according to the transmission frequency of described signal to be sent and the original frequency of described signal to be sent;
Utilize described the first local oscillator radiofrequency signal that described signal to be sent is sent by described coaxial cable with accompaniment signal after original frequency is converted to described transmission frequency.
8. method according to claim 7, it is characterized in that, also comprise: after utilizing described the first local oscillator radiofrequency signal that described signal to be sent is converted to described transmission frequency from original frequency, before described signal coupling to be sent sent to the described coaxial cable, also comprise:
Described signal to be sent is amplified and high pass or bandpass filtering treatment.
9. a signal acceptance method is characterized in that, comprising:
The original frequency of definite signal that receives;
Transmission frequency and described original frequency according to the signal that receives dispose the second local oscillator radiofrequency signal, wherein, described transmission frequency is to determine that according to reference frequency and described original frequency described reference frequency is to follow at least one reference frequency of transmission on the coaxial cable with signal to be sent;
Utilize described the second local oscillator radiofrequency signal that the signal that receives is converted to described original frequency and reception from transmission frequency.
10. method according to claim 9 is characterized in that, also comprises:
Utilize before described the second local oscillator radiofrequency signal is converted to described original frequency with the signal that receives from transmission frequency, also comprise:
The signal that receives is carried out high-pass filtering and amplifies processing.
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| CN 201010139123 CN101814926B (en) | 2010-04-01 | 2010-04-01 | Signal transmission device and method |
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| CN 201010139123 CN101814926B (en) | 2010-04-01 | 2010-04-01 | Signal transmission device and method |
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| CN103475611B (en) * | 2013-08-02 | 2016-12-28 | 华为技术有限公司 | A kind of from coherent transfer method, equipment and system |
| CN105450311A (en) * | 2015-11-06 | 2016-03-30 | 北京邮电大学 | Signal receiving device |
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| US6486986B1 (en) * | 1998-10-14 | 2002-11-26 | Matsushita Electric Industrial Co., Ltd. | System for optically transmitting frequency-division-multiplexed signal and transmitter therefor |
| CN1466836A (en) * | 2000-07-27 | 2004-01-07 | 莱恩克实验股份有限公司 | Data transmission equipment and method |
| CN101304279A (en) * | 2008-06-30 | 2008-11-12 | 京信通信系统（中国）有限公司 | Radio frequency extension apparatus and base station system |
| CN101635930A (en) * | 2008-07-21 | 2010-01-27 | 中兴通讯股份有限公司 | Method for covering tunnel in time division-synchronous code division multiple access mobile communication system |
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| US6486986B1 (en) * | 1998-10-14 | 2002-11-26 | Matsushita Electric Industrial Co., Ltd. | System for optically transmitting frequency-division-multiplexed signal and transmitter therefor |
| CN1466836A (en) * | 2000-07-27 | 2004-01-07 | 莱恩克实验股份有限公司 | Data transmission equipment and method |
| CN101304279A (en) * | 2008-06-30 | 2008-11-12 | 京信通信系统（中国）有限公司 | Radio frequency extension apparatus and base station system |
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