CN105356919A - Distributed antenna system, and distributed antenna signal processing method and apparatus - Google Patents
Distributed antenna system, and distributed antenna signal processing method and apparatus Download PDFInfo
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- CN105356919A CN105356919A CN201510834379.0A CN201510834379A CN105356919A CN 105356919 A CN105356919 A CN 105356919A CN 201510834379 A CN201510834379 A CN 201510834379A CN 105356919 A CN105356919 A CN 105356919A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/18—Network planning tools
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
Abstract
The invention discloses a distributed antenna system, and a distributed antenna signal processing method and apparatus. The distributed antenna system comprises a plurality of antenna units and a baseband processing device, wherein the plurality of antenna units are used for receiving radiofrequency signals transmitted from a user terminal; the baseband processing device includes a signal processor and a baseband processing chip; the signal processor is connected with the plurality of antenna units and the baseband processing chip; the signal processor is used for transmitting one-channel of signals to the baseband processing chip; the one-channel of signals are determined among multi-channel of signals received from the plurality of antenna units according to the channel quality information between the same user terminal and the plurality of antenna units; and the multi-channel of signals are digital signals which are converted from the radiofrequency signals transmitted to the plurality of antenna units from the same user terminal. The distributed antenna system, and the distributed antenna signal processing method and apparatus can solve the technical problem that in the prior art, a distributed antenna system is high in cost.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of distributing antenna system and spaced antenna signal processing method and device.
Background technology
For the communications field, Wireless Telecom Equipment generally includes radio-frequency module and baseband module, and wherein, baseband module is for the treatment of digital signal, and radio-frequency module realizes digital signal and can mutual conversion between the air analog signal of space propagation.
In existing wireless communication system, macro base station is mainly used in outdoor scene and is used for supporting wireless traffic, and macro base station can cover wider region, has stronger disposal ability, and owing to being not too subject to the restriction of space for its deployment, therefore volume is also larger.Macro base station comprises baseband module and radio-frequency module usually simultaneously.And for indoor scene, because wireless signal is penetrating in the processes such as building, wall, object and can decayed, therefore in order to meet the demand of the radio communication of this scene, there has been proposed distributing antenna system; Because indoor scene disposes the limited space of wireless device, to be therefore usually separated with baseband module by radio-frequency module, such as " baseband pool " equipment can process the wireless signal corresponding to multiple radio-frequency module, is deployed in machine room; And radio-frequency module volume is very little, on the ceiling that can be deployed in each room or hang wall; Base band pool equipment is connected by cable with radio-frequency module, just can meet indoor radio communication and cover.
The mode that existing distributing antenna system mainly adopts is, together with the radio-frequency module that each antenna element is corresponding is deployed in antenna element, and baseband module corresponding to all antenna elements is concentrated and is deployed in baseband pool, thus each antenna element equals a corresponding community, the program has the benefit of cell splitting.
Inventor finds, the antenna element being distributed in each district in existing distributing antenna system is responsible for the communication to the user terminal in its coverage, this makes " baseband pool " needs to have powerful disposal ability, each antenna element correspondence is provided with a baseband processing chip to process the communication service on it, (multiple community is according to the state of affairs of self even also to need module comprising combined dispatching etc., the situation of wireless channel is independently dispatched, the signal that usual transmission is different, interference will be there is between these signals, interference each other can be stood to need combined dispatching to ensure), thus cause base band processing device very complicated, cost is also higher.And in many scenes, only only have the demand of simple wireless traffic, do not require too high power capacity demand, such as Internet of Things application, the data volume of each internet-of-things terminal is less; Or the data of EXIT pay application, and the data volume involved by wireless payment business is also less.What these scenes were paid close attention to is covering problem and Cost Problems, and existing distributing antenna system is applied in these scenes, and this can make communications cost higher.
For above-mentioned problem, at present effective solution is not yet proposed.
Summary of the invention
Embodiments provide a kind of distributing antenna system and spaced antenna signal processing method and device, at least to solve the high technical problem of distributing antenna system cost of the prior art.
According to an aspect of the embodiment of the present invention, provide a kind of distributing antenna system, comprising: multiple antenna element, for receiving the radiofrequency signal that user terminal sends, base band processing device, comprise signal processor and baseband processing chip, described signal processor is connected respectively with each described antenna element and described baseband processing chip, described signal processor is used for sending a road signal to described baseband processing chip, wherein, a described road signal is the road signal that described signal processor is determined from the corresponding multiple signals received of described multiple antenna element according to the channel quality information between same user terminal to each described antenna element, described multiple signals are that the radiofrequency signal being sent to described multiple antenna element by described same user terminal transforms the digital signal obtained.
Further, described signal processor is also for being merged into a described road signal by corresponding for the described multiple antenna element multiple signals received.
Further, described signal processor is signal selector, and described signal selector is used for the signal selected from the multiple signals that described multiple antenna element receives as a described road signal.
Further, described signal selector also for detecting the signal quality that described multiple antenna element sends, obtaining the signal quality information for the described signal quality of correspondence, selecting a described road signal according to described signal quality information.
Further, described system also comprises detector, described detector is arranged on described antenna element, or be arranged on described base band processing device, described detector is connected with described signal processor, for detecting the channel quality information between described same user terminal to corresponding each antenna element in described multiple antenna element.
Further, described detector comprises: cache module, for the frequency pilot sign in buffered signal transmission; Channel estimation module, is connected with described cache module, for determining described channel quality information by described frequency pilot sign.
Further, described detector comprises: go CP module, for removing the Cyclic Prefix of the signal that corresponding described antenna element exports; FFT module, carries out fast Fourier transform for the signal exported corresponding described antenna element.
Further, described base band processing device also comprises: memory module, for storing the corresponding table of subscriber equipment and antenna element, wherein, described correspondence table stores the corresponding relation of subscriber equipment and antenna element, described signal processor is connected with described memory module, and the signal of described signal processor also for selecting the antenna element corresponding with user terminal to send according to subscriber equipment with the corresponding relation of antenna element, is sent to described baseband processing chip.
Further, described base band processing device also comprises: scheduler, is connected with described signal processor, for the resource indicating described user terminal to be scheduled to described signal processor.
According to the another aspect of the embodiment of the present invention, additionally provide a kind of spaced antenna signal processing method, comprise: receive the multiple signals sent by multiple antenna element, wherein, described multiple signals are that the radiofrequency signal being sent to described multiple antenna element by same user terminal transforms the digital signal obtained; According to the road signal that the channel quality information between described same user terminal and described multiple antenna element is determined from described multiple signals; The road signal determined is sent to baseband processing chip.
Further, the road signal determined from described multiple signals according to the channel quality information between described same user terminal and described multiple antenna element comprises: the road signal determined described in being merged into by the multiple signals received from described multiple antenna element; Or, select from the multiple signals that described multiple antenna element receives as described in the signal of a road signal determined.
Further, before the road signal determined from described multiple signals according to the channel quality information between described same user terminal and described multiple antenna element, described method also comprises: detect the channel quality information between described same user terminal and each antenna element of described multiple antenna element.
Further, the channel quality information detected between described same user terminal and each antenna element of described multiple antenna element comprises: the frequency pilot sign obtaining described multiple signals Zhong Mei road signal; The channel quality information between the antenna element that described multiple signals Zhong Mei road signal is corresponding and described same terminal is determined by described frequency pilot sign.
According to the another aspect of the embodiment of the present invention, additionally provide a kind of spaced antenna signal processing apparatus, comprise: receiving element, for receiving the multiple signals sent by multiple antenna element, wherein, described multiple signals are that the radiofrequency signal being sent to described multiple antenna element by same user terminal transforms the digital signal obtained; Determining unit, for the road signal determined from described multiple signals according to the channel quality information between described same user terminal and described multiple antenna element; Transmitting element, for being sent to baseband processing chip by determine one road signal.
Further, described determining unit comprises: merge module, for the road signal determined described in being merged into by the multiple signals received from described multiple antenna element; Or selection module, for select in the multiple signals that receive from described multiple antenna element as described in the signal of a road signal determined.
Further, described device also comprises: detecting unit, for before the road signal determined from described multiple signals according to the channel quality information between described same user terminal and described multiple antenna element, detect the channel quality information between described same user terminal and each antenna element of described multiple antenna element.
Further, described detecting unit comprises: acquisition module, for obtaining the frequency pilot sign of described multiple signals Zhong Mei road signal; Determination module, for determining the channel quality information between the antenna element that described multiple signals Zhong Mei road signal is corresponding and described same terminal by described frequency pilot sign.
In the embodiment of the present invention, owing to have employed signal processor, in order to determine a road signal from multiple signals, thus ensure, after multiple antenna element receives the signal that same user terminal sends, to be sent to the signal Ye Wei mono-road signal that baseband processing chip carries out processing.The embodiment of the present invention adopts a baseband processing chip to process the road signal sent through signal processor, without the need to multiple baseband processing chip, the corresponding antenna element of each baseband processing chip, reduce greatly the cost of distributing antenna system, solve the technical problem that distributing antenna system cost of the prior art is high.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the distributing antenna system according to the embodiment of the present invention;
Fig. 2 is the schematic diagram of a kind of optional distributing antenna system according to the embodiment of the present invention;
Fig. 3 is the schematic diagram according to the optional distributing antenna system of the another kind of the embodiment of the present invention;
Fig. 4 is the schematic diagram of another the optional distributing antenna system according to the embodiment of the present invention;
Fig. 5 is the schematic diagram of another the optional distributing antenna system according to the embodiment of the present invention;
Fig. 6 is the schematic diagram of another the optional distributing antenna system according to the embodiment of the present invention;
Fig. 7 is the flow chart of the spaced antenna signal processing method according to the embodiment of the present invention;
Fig. 8 is the schematic diagram of the spaced antenna signal processing apparatus according to the embodiment of the present invention.
Embodiment
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
It should be noted that, term " first ", " second " etc. in specification of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiments of the invention described herein can with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
Embodiments provide a kind of distributing antenna system, this distributed system may be used in the application scenarios such as Internet of Things application, data payment application.
Fig. 1 is the schematic diagram of the distributing antenna system according to the embodiment of the present invention, and as shown in Figure 1, this system comprises: multiple antenna element 10 and base band processing device 20, and wherein, base band processing device 20 comprises signal processor 202 and baseband processing chip 204.
The radiofrequency signal that multiple antenna element 10 sends for receiving user terminal; Signal processor 202 is connected respectively with each antenna element 10 and baseband processing chip 204, this signal processor 202 is for sending a road signal to baseband processing chip 204, wherein, one road signal is the road signal that signal processor 202 is determined from the corresponding multiple signals received of multiple antenna element 10 according to the channel quality information between same user terminal to each antenna element, and multiple signals are that the radiofrequency signal being sent to multiple antenna element 10 by same user terminal transforms the digital signal obtained.
As shown in Figure 1, the antenna element of the present embodiment also comprises radio-frequency module 102 and physical antenna (quantity does not limit), radio-frequency module 102 for the reception of radiofrequency signal and process, i.e. the radiofrequency signal transmitted of reception antenna, and be translated into digital signal.Wherein, radiofrequency signal is that user terminal (UserEquipment, referred to as UE) sends to antenna.Can refer to that multiple antenna element, each antenna element sends a road signal from the corresponding multiple signals received of multiple antenna element 10, the multichannel model formed, also can be the multiple signals that in multiple antenna element, some antennas unit sends, wherein, in some antennas unit, each antenna element sends a road signal.
In the present embodiment, multiple antenna element can be arranged on same indoor, and such as, supermarket, market or user are indoor, to be comparatively closely distributed in same place indoor or adjacent indoor scene, thus meets sufficient coverage rate.Different antenna elements can receive the radiofrequency signal that same user terminal sends, like this, signal processor can be determined according to the channel quality between this user terminal with antenna element and be sent to baseband processing chip by the road signal that the more excellent channel of a road quality is corresponding from multiple signals.
In the embodiment of the present invention, owing to have employed signal processor, in order to determine a road signal from multiple signals, significantly decrease the complexity of baseband processing chip, thus ensure, after multiple antenna element receives the signal that same user terminal sends, to be sent to the signal Ye Wei mono-road signal that baseband processing chip carries out processing.The embodiment of the present invention adopts a baseband processing chip to process the road signal sent through signal processor, without the need to multiple baseband processing chip, also without the need to the base band pool equipment of complexity, the corresponding antenna element of each baseband processing chip, reduce greatly the cost of distributing antenna system, solve the technical problem that distributing antenna system cost of the prior art is high.
A kind of distributing antenna system of the embodiment of the present invention as shown in Figure 2, in such systems, not multiple community of multiple antenna element 10 correspondence, but a community (as the region that dotted line in Fig. 2 covers), wherein, antenna element 10 and base band processing device can pass through common public radio interface (CommonPublicRadioInterface, referred to as CPRI) and connect.For uplink service (UE sends to network), after multiple antenna element 10 receives the upward signal of UE transmission, pass to base band processing device by CPRI interface to process, different UEs uses different resource (such as different time or different frequencies) transmitting wireless signals, for different resources, base band processing device can carry out processing from the signal behavior one from multiple CPRI interface, and therefore base band processing device only needs to have the wireless communication needs that lower complexity can meet this scene generally.Such as, carry out for 20MHz radio spectrum resources, if each antenna element can use the data service of 20MHz bandwidth for transmission 100Mbps, in distributing antenna system in the prior art, whole volume is exactly 4*100Mbps, but needs base band processing device to possess the process complexity of corresponding magnitude; And in embodiments of the present invention, whole volume is then 100Mbps, only need simple disposal ability, the T2200 series baseband chip such as only needing one piece of such as Intel Company to produce just can support the covering that above-mentioned scene is same, and does not need 4 pieces of these chips.
Preferably, signal processor is also for being merged into a road signal by corresponding for the multiple antenna element multiple signals received.
In the embodiment of the present invention, when the multiple signals that multiple antenna element sends can be merged into a road signal by signal processor, or from above-mentioned multiple signals, select two paths of signals to be wherein merged into a road signal (if only have two-way, then direct by two paths of signals merging).Alternatively, this Method compare is suitable for the situation (quality of wireless channel of UE and 2 antenna element suitable) of UE in the middle of the overlay area of two antenna elements.Wherein, the mode of merging can be equal gain combining, alternative amalgamate, maximum-ratio combing etc.
Alternatively, signal processor is signal selector, and signal selector is used for the signal selected from the multiple signals that multiple antenna element receives as a road signal.
The signal selector of the embodiment of the present invention can select a road signal from the multiple signals that antenna element receives, or therefrom selects two paths of signals and be merged into a road signal, sends to baseband processing chip to process.This Method compare is suitable for the situation (quality of wireless channel of UE and one of them antenna element better) of UE near antenna element.Such as, the best road signal of signal quality is selected to carry out service communication.
Preferably, signal selector also for detecting the signal quality that multiple antenna element sends, obtaining the signal quality information for respective signal quality, selecting a road signal according to signal quality information.
In the embodiment of the present invention, signal selector can also be used for detection signal quality, this signal quality can refer to the signal quality between user terminal and antenna element, this signal quality can send in the signal of signal processor to detect by antenna element and obtain, so that according to the processing mode of signal quality determination signal.Such as, signal processor can be measured above-mentioned multiple signals, such as, measure these multiple signals and divide other signal to noise ratio (SINR), and selects SINR most Gao mono-road signal to carry out subsequent treatment; Or select wherein to carry out merging etc. more than some roads signal of SINR thresholding.
Preferably, system also comprises detector, and detector is arranged on antenna element, or is arranged on base band processing device, detector is connected with signal processor, for detecting the channel quality information between same user terminal each antenna element corresponding to multiple antenna element.
In the present embodiment, detecting the channel quality for detecting between user terminal and antenna element, obtaining channel quality information.This detector can be arranged on base band processing device, also can be arranged on antenna element.When selecting detector to be arranged on antenna element, can a detector being set separately on each antenna element, for detecting the channel quality information of corresponding antenna element, then sending it to signal processor.When detector is arranged on base band processing device, detected the channel quality information of all antenna elements by this detector.
According to the embodiment of the present invention, detect the channel quality information between antenna element and user terminal by detector, so that signal processor determines the signal sending to baseband processing chip according to channel quality information.
Preferably, detector comprises: cache module, for the frequency pilot sign in buffered signal transmission; Channel estimation module, is connected with cache module, for determining channel quality information by frequency pilot sign.
Fig. 3 shows that a kind of the execution mode be arranged on antenna element 10 (illustrate only the module that the detector in an antenna element comprises in figure by detector (not shown), other antenna elements in like manner), as shown in Figure 3, cache module 1041 is for the frequency pilot sign in buffered signal transmission, channel estimation module 1042 directly can carry out to wireless channel the information estimating acquisition channel quality, thus auxiliary signal processor determination respective handling mode.
For LTE communication system, for the uplink of LTE system, each sub-frame of uplink comprises 14 symbols, frequency pilot sign (that is to say the DMRS in LTE system) wherein for channel estimating is the 4th, 11 symbol, therefore after antenna element receives the signal of a subframe, at least need buffer memory the 4th symbol for after channel estimating, respective handling mode could be determined.Therefore, in embodiments of the present invention, cache module is used for the signal of buffer memory at least 4 symbols, and determines respective handling mode according to the 4th the symbol result of carrying out after channel estimating.
Preferably, detector comprises: go CP module and FFT module.Wherein, go CP module for removing the Cyclic Prefix (CyclicPrefix, referred to as CP) of the signal of corresponding antenna element output; FFT module is used for carrying out fast Fourier transform (FastFourierTransformation, referred to as FFT) to the signal that corresponding antenna element exports.
As shown in Figure 4, go CP module 1043 to be connected with cache module 1041, FFT module 1044 also connects (illustrate only the module comprised in an antenna element in figure, other antenna elements in like manner) in cache module 1041.
The signal processor of the embodiment of the present invention can also determine processing mode according to the intensity of frequency-region signal.Particularly, the distributing antenna system that the embodiment of the present invention provides may be used for LTE communication system, this LTE communication system adopts OFDM technology, therefore corresponding module can also be comprised with the behavior of auxiliary signal processor on antenna element, such as shown in Fig. 4, antenna element 10 increases and goes CP module 1043, cache module 1041 and FFT module 1044, thus obtain the signal of frequency domain, because LTE system have employed OFDM technology, the resource that scheduler is dispatched is the resource of frequency domain, therefore the signal of frequency domain is obtained by the method, just can judge the intensity of the signal from these antenna unit, thus determine.Such as, select the strongest signal of the signal strength signal intensity of frequency domain to carry out subsequent treatment, or the signal selecting the signal strength signal intensity of frequency domain to exceed a certain thresholding carries out subsequent treatment, when the signal exceeding thresholding has at least 2, then carry out signal union operation.
Alternatively, base band processing device also comprises: memory module, for storing the corresponding table of subscriber equipment and antenna element, wherein, corresponding table stores the corresponding relation of subscriber equipment and antenna element, signal processor is connected with memory module, and the signal of signal processor also for selecting the antenna element corresponding with user terminal to send according to subscriber equipment with the corresponding relation of antenna element, is sent to baseband processing chip.
Such as, in corresponding table, store UE1 respective antenna unit 4, then when signal processor is when processing the signal of UE1, determine to process the signal from antenna element 4 according to correspondence table.Wherein, signal processor knows that the mode of the information of UE is not limit, such as, by other module, this information is sent to signal processor etc.
Further, antenna element can corresponding multiple subscriber equipment, like this, after signal processor receives the information identifying subscriber equipment, the antenna element of its correspondence can be found out from correspondence table, thus the signal of this antenna element is sent to baseband processing chip.Subscriber equipment also can corresponding multiple antenna element, and like this, after identifying user profile, the signal processing mode during the embodiment of the present invention can be utilized aforementioned determines a road signal from the signal of multiple antenna elements corresponding to subscriber equipment.
Preferably, base band processing device also comprises: scheduler, is connected with signal processor, for the resource be scheduled to signal processor indicating user terminal.
Usually requiring that the upward signal that different UEs sends needs to use different resources, in the embodiment of the present invention, dispatching to the resource used of user terminal by increasing scheduler.Such as scheduler can control in the subframe (subframe lengths is 1ms in LTE system) being numbered 4 × n, to send signal with the good UE of antenna element 1 communication quality, in the subframe being numbered 4 × n+1, signal is sent with the good UE of antenna element 2 communication quality, in the subframe being numbered 4 × n+2, signal is sent with the good UE of antenna element 3 communication quality, in the subframe being numbered 4 × n+3, send signal etc. with the good UE of antenna element 4 communication quality, thus interference would not be there is each other in the wireless signal that these UE are sent.
For more simple descending, only need the signal (signal of a corresponding road 20MHz) that baseband processing unit exports to be copied to respectively to send to antenna element.Similarly, with the measured different UEs of different antennae unit communication matter, only need to receive the wireless signal of (in different subframe described above) in the resource that is scheduled.
Particularly, as shown in Figure 5, signal processor 202 is connected with scheduler 208, like this, signal processor 202 just can know from scheduler 208 resource (the numbering of such as PRB that certain UE is scheduled, or the numbering etc. of TTI), and then determine the processing mode to the signal in this resource.
Further, as shown in Figure 5, signal processor 202 is connected with memory module 206, show in conjunction with UE is corresponding with antenna element, know the antenna element that UE is corresponding, then know from scheduler the resource that this UE is scheduled, and then just can judge the signal only selecting to be received in these transmitted over resources from respective antenna unit, or only select to process on respective antenna unit, at the signal of these transmitted over resources, thus auxiliary signal processor more suitably processing mode.Interface between scheduler and signal processor can such as SPI interface.
User terminal described in the present invention, can be mobile phone (or mobile phone), or other can send or receive the equipment of wireless signal, comprise subscriber equipment (terminal), wifi signal was stood, movable signal can be converted to personal digital assistant (PDA), wireless modem, radio communication device, hand-held device, laptop computer, cordless telephone, wireless local loop (WLL) CPE or Mifi, intelligent appliance or other obstructed operation unusually just can the spontaneous equipment etc. communicated with mobile communications network.
Preferably, the embodiment of the present invention additionally provides a kind of execution mode of signal processor cascade, specifically as shown in Figure 6, this distributing antenna system comprises: multiple antenna element 10, first signal processor 30 and base band processing device 20, wherein, base band processing device 20 comprises secondary signal processor 202 and baseband processing chip 204.
The radiofrequency signal that multiple antenna element sends for receiving user terminal; First signal processor 30 is arranged on the antenna element in multiple antenna element, be connected respectively, for sending the road signal determined from the multiple signals that the antenna element being connected to the first signal processor 30 sends according to the channel quality information between same user terminal and the antenna element being connected to the first signal processor 30 to secondary signal processor 202 with the signal output part of multiple antenna element and secondary signal processor 202; Secondary signal processor 202 is connected with baseband processing chip 204 respectively with the first signal processor 30, and secondary signal processor 202 is for being sent to baseband processing chip by determine one road signal.
In the present embodiment, secondary signal processor is equivalent to the signal processor in above-described embodiment.The antenna element being connected to the first signal processor 30 comprises the antenna element itself being provided with this first signal processor 30.As shown in Figure 1, each antenna element also comprises radio-frequency module and physical antenna (quantity does not limit), and radio-frequency module is used for reception and the process of radiofrequency signal, i.e. the radiofrequency signal of reception antenna transmission, and is translated into digital signal.Wherein, radiofrequency signal is that user terminal (UserEquipment, referred to as UE) sends to antenna.Wherein, first signal processor 30 is connected on the radio-frequency module of multiple antenna element (comprising the antenna element arranging this first signal processor), in order to receive the signal that in these antenna unit, multiple antenna element sends, and determine that a road signal is sent to the secondary signal processor 202 of base band processing device, by secondary signal processor 202, this signal is sent to baseband processing chip to process, to carry out service communication.
According to the embodiment of the present invention, provide a kind of embodiment of the method for spaced antenna signal processing method, it should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the flow chart of accompanying drawing, the spaced antenna signal processing method of the present embodiment can be performed by the distributing antenna system provided in the embodiment of the present invention.Further, although show logical order in flow charts, in some cases, can be different from the step shown or described by order execution herein.
As shown in Figure 7, this spaced antenna signal processing method comprises the following steps:
Step S602, receives the multiple signals sent by multiple antenna element, and wherein, multiple signals are that the radiofrequency signal being sent to multiple antenna element by same user terminal transforms the digital signal obtained.
Step S604, according to the road signal that the channel quality information between same user terminal and multiple antenna element is determined from multiple signals.
Step S606, is sent to baseband processing chip by the road signal determined.
In the present embodiment, multiple antenna element can be arranged on same indoor, and such as, supermarket, market or user are indoor, to be comparatively closely distributed in same place indoor or adjacent indoor scene, thus meets sufficient coverage rate.Different antenna elements can receive the radiofrequency signal that same user terminal sends, like this, signal processor can be determined according to the channel quality between this user terminal with antenna element and be sent to baseband processing chip by the road signal that the more excellent channel of a road quality is corresponding from multiple signals.
In the embodiment of the present invention, by the road signal determined from multiple signals according to the channel quality information between same user terminal and multiple antenna element, significantly decrease the complexity of baseband processing chip, thus ensure, after multiple antenna element receives the signal that same user terminal sends, to be sent to the signal Ye Wei mono-road signal that baseband processing chip carries out processing.The embodiment of the present invention adopts a baseband processing chip to process the road signal sent through signal processor, without the need to multiple baseband processing chip, also without the need to the base band pool equipment of complexity, the corresponding antenna element of each baseband processing chip, reduce greatly the cost of distributing antenna system, solve the technical problem that distributing antenna system cost of the prior art is high.
A kind of distributing antenna system of the embodiment of the present invention as shown in Figure 2, in such systems, not multiple community of multiple antenna element 10 correspondence, but a community (as the region that dotted line in Fig. 2 covers), wherein, antenna element 10 and base band processing device can pass through common public radio interface (CommonPublicRadioInterface, referred to as CPRI) and connect.For uplink service (UE sends to network), after multiple antenna element 10 receives the upward signal of UE transmission, pass to base band processing device by CPRI interface to process, different UEs uses different resource (such as different time or different frequencies) transmitting wireless signals, for different resources, base band processing device can carry out processing from the signal behavior one from multiple CPRI interface, and therefore base band processing device only needs to have the wireless communication needs that lower complexity can meet this scene generally.Such as, carry out for 20MHz radio spectrum resources, if each antenna element can use the data service of 20MHz bandwidth for transmission 100Mbps, in distributing antenna system in the prior art, whole volume is exactly 4*100Mbps, but needs base band processing device to possess the process complexity of corresponding magnitude; And in embodiments of the present invention, whole volume is then 100Mbps, only need simple disposal ability, the T2200 series baseband chip such as only needing one piece of such as Intel Company to produce just can support the covering that above-mentioned scene is same, and does not need 4 pieces of these chips.
Preferably, the road signal determined from multiple signals according to the channel quality information between same user terminal and multiple antenna element comprises: the multiple signals received from multiple antenna element are merged into the road signal determined; Or from the multiple signals that multiple antenna element receives, select the signal as the road signal determined.
In the embodiment of the present invention, the multiple signals that multiple antenna element sends can be merged into a road signal, or from above-mentioned multiple signals, select two paths of signals to be wherein merged into a road signal (if only have two-way, then direct by two paths of signals merging).Alternatively, this Method compare is suitable for the situation (quality of wireless channel of UE and 2 antenna element suitable) of UE in the middle of the overlay area of two antenna elements.Wherein, the mode of merging can be equal gain combining, alternative amalgamate, maximum-ratio combing etc.
In the embodiment of the present invention, a road signal can also be selected from the multiple signals that antenna element receives, or therefrom select two paths of signals and be merged into a road signal, send to baseband processing chip to process.This Method compare is suitable for the situation (quality of wireless channel of UE and one of them antenna element better) of UE near antenna element.Such as, the best road signal of signal quality is selected to carry out service communication.
Preferably, before the road signal determined from multiple signals according to the channel quality information between same user terminal and multiple antenna element, method also comprises: detect the channel quality information between same user terminal and each antenna element of multiple antenna element.
In the embodiment of the present invention, signal quality can refer to the signal quality between user terminal and antenna element, this signal quality can send in the signal of signal processor to detect by antenna element and obtain, so that according to the processing mode of signal quality determination signal.Such as, signal processor can be measured above-mentioned multiple signals, such as, measure these multiple signals and divide other signal to noise ratio (SINR), and selects SINR most Gao mono-road signal to carry out subsequent treatment; Or select wherein to carry out merging etc. more than some roads signal of SINR thresholding.
Alternatively, the channel quality information detected between same user terminal and each antenna element of multiple antenna element comprises: the frequency pilot sign obtaining multiple signals Zhong Mei road signal; The channel quality information between the antenna element that multiple signals Zhong Mei road signal is corresponding and same terminal is determined by frequency pilot sign.
For LTE communication system, for the uplink of LTE system, each sub-frame of uplink comprises 14 symbols, frequency pilot sign (that is to say the DMRS in LTE system) wherein for channel estimating is the 4th, 11 symbol, therefore after antenna element receives the signal of a subframe, at least need buffer memory the 4th symbol for after channel estimating, respective handling mode could be determined.Therefore, in embodiments of the present invention, cache module is used for the signal of buffer memory at least 4 symbols, and determines respective handling mode according to the 4th the symbol result of carrying out after channel estimating.
The embodiment of the present invention additionally provides a kind of spaced antenna signal processing apparatus, this device may be used for the spaced antenna signal processing method performing the embodiment of the present invention, wherein, spaced antenna signal processing apparatus can be arranged on the base band processing device of the embodiment of the present invention, specifically can have the signal processor of the embodiment of the present invention to realize.
The spaced antenna signal processing apparatus of the embodiment of the present invention comprises: receiving element 801, determining unit 803 and transmitting element 805.
Receiving element 801 is for receiving the multiple signals sent by multiple antenna element, and wherein, multiple signals are that the radiofrequency signal being sent to multiple antenna element by same user terminal transforms the digital signal obtained.
The road signal of determining unit 803 for determining from multiple signals according to the channel quality information between same user terminal and multiple antenna element.
Transmitting element 805 is for being sent to baseband processing chip by determine one road signal.
In the present embodiment, multiple antenna element can be arranged on same indoor, and such as, supermarket, market or user are indoor, to be comparatively closely distributed in same place indoor or adjacent indoor scene, thus meets sufficient coverage rate.Different antenna elements can receive the radiofrequency signal that same user terminal sends, like this, signal processor can be determined according to the channel quality between this user terminal with antenna element and be sent to baseband processing chip by the road signal that the more excellent channel of a road quality is corresponding from multiple signals.
In the embodiment of the present invention, by the road signal determined from multiple signals according to the channel quality information between same user terminal and multiple antenna element, significantly decrease the complexity of baseband processing chip, thus ensure, after multiple antenna element receives the signal that same user terminal sends, to be sent to the signal Ye Wei mono-road signal that baseband processing chip carries out processing.The embodiment of the present invention adopts a baseband processing chip to process the road signal sent through signal processor, without the need to multiple baseband processing chip, also without the need to the base band pool equipment of complexity, the corresponding antenna element of each baseband processing chip, reduce greatly the cost of distributing antenna system, solve the technical problem that distributing antenna system cost of the prior art is high.
A kind of distributing antenna system of the embodiment of the present invention as shown in Figure 2, in such systems, not multiple community of multiple antenna element 10 correspondence, but a community (as the region that dotted line in Fig. 2 covers), wherein, antenna element 10 and base band processing device can pass through common public radio interface (CommonPublicRadioInterface, referred to as CPRI) and connect.For uplink service (UE sends to network), after multiple antenna element 10 receives the upward signal of UE transmission, pass to base band processing device by CPRI interface to process, different UEs uses different resource (such as different time or different frequencies) transmitting wireless signals, for different resources, base band processing device can carry out processing from the signal behavior one from multiple CPRI interface, and therefore base band processing device only needs to have the wireless communication needs that lower complexity can meet this scene generally.Such as, carry out for 20MHz radio spectrum resources, if each antenna element can use the data service of 20MHz bandwidth for transmission 100Mbps, in distributing antenna system in the prior art, whole volume is exactly 4*100Mbps, but needs base band processing device to possess the process complexity of corresponding magnitude; And in embodiments of the present invention, whole volume is then 100Mbps, only need simple disposal ability, the T2200 series baseband chip such as only needing one piece of such as Intel Company to produce just can support the covering that above-mentioned scene is same, and does not need 4 pieces of these chips.
Preferably, determining unit comprises: merge module, for the multiple signals received from multiple antenna element being merged into the road signal determined; Or, select module, for selecting the signal as the road signal determined in the multiple signals that receive from multiple antenna element.
In the embodiment of the present invention, the multiple signals that multiple antenna element sends can be merged into a road signal, or from above-mentioned multiple signals, select two paths of signals to be wherein merged into a road signal (if only have two-way, then direct by two paths of signals merging).Alternatively, this Method compare is suitable for the situation (quality of wireless channel of UE and 2 antenna element suitable) of UE in the middle of the overlay area of two antenna elements.Wherein, the mode of merging can be equal gain combining, alternative amalgamate, maximum-ratio combing etc.
In the embodiment of the present invention, a road signal can also be selected from the multiple signals that antenna element receives, or therefrom select two paths of signals and be merged into a road signal, send to baseband processing chip to process.This Method compare is suitable for the situation (quality of wireless channel of UE and one of them antenna element better) of UE near antenna element.Such as, the best road signal of signal quality is selected to carry out service communication.
Preferably, device also comprises: detecting unit, for before the road signal determined from multiple signals according to the channel quality information between same user terminal and multiple antenna element, detect the channel quality information between same user terminal and each antenna element of multiple antenna element.
In the embodiment of the present invention, signal quality can refer to the signal quality between user terminal and antenna element, this signal quality can send in the signal of signal processor to detect by antenna element and obtain, so that according to the processing mode of signal quality determination signal.Such as, signal processor can be measured above-mentioned multiple signals, such as, measure these multiple signals and divide other signal to noise ratio (SINR), and selects SINR most Gao mono-road signal to carry out subsequent treatment; Or select wherein to carry out merging etc. more than some roads signal of SINR thresholding.
Preferably, detecting unit comprises: acquisition module, for obtaining the frequency pilot sign of multiple signals Zhong Mei road signal; Determination module, for determining the channel quality information between the antenna element that multiple signals Zhong Mei road signal is corresponding and same terminal by frequency pilot sign.
For LTE communication system, for the uplink of LTE system, each sub-frame of uplink comprises 14 symbols, frequency pilot sign (that is to say the DMRS in LTE system) wherein for channel estimating is the 4th, 11 symbol, therefore after antenna element receives the signal of a subframe, at least need buffer memory the 4th symbol for after channel estimating, respective handling mode could be determined.Therefore, in embodiments of the present invention, cache module is used for the signal of buffer memory at least 4 symbols, and determines respective handling mode according to the 4th the symbol result of carrying out after channel estimating.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
In the above embodiment of the present invention, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiments.
In several embodiments that the application provides, should be understood that, disclosed technology contents, the mode by other realizes.Wherein, device embodiment described above is only schematic, the such as division of described unit, can be that a kind of logic function divides, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of unit or module or communication connection can be electrical or other form.
The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed on multiple unit.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form of SFU software functional unit also can be adopted to realize.
If described integrated unit using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computer read/write memory medium.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words or all or part of of this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprises all or part of step of some instructions in order to make a computer equipment (can be personal computer, server or the network equipment etc.) perform method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, read-only memory (ROM, Read-OnlyMemory), random access memory (RAM, RandomAccessMemory), portable hard drive, magnetic disc or CD etc. various can be program code stored medium.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles 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 distributing antenna system, is characterized in that, comprising:
Multiple antenna element, for receiving the radiofrequency signal that user terminal sends;
Base band processing device, comprise signal processor and baseband processing chip, described signal processor is connected respectively with each described antenna element and described baseband processing chip, described signal processor is used for sending a road signal to described baseband processing chip, wherein, a described road signal is the road signal that described signal processor is determined from the corresponding multiple signals received of described multiple antenna element according to the channel quality information between same user terminal to each described antenna element, described multiple signals are that the radiofrequency signal being sent to described multiple antenna element by described same user terminal transforms the digital signal obtained.
2. system according to claim 1, is characterized in that, described signal processor is also for being merged into a described road signal by corresponding for the described multiple antenna element multiple signals received.
3. system according to claim 1, is characterized in that, described signal processor is signal selector, and described signal selector is used for the signal selected from the multiple signals that described multiple antenna element receives as a described road signal.
4. system according to claim 3, it is characterized in that, described signal selector also for detecting the signal quality that described multiple antenna element sends, obtaining the signal quality information for the described signal quality of correspondence, selecting a described road signal according to described signal quality information.
5. system according to claim 1, it is characterized in that, described system also comprises detector, described detector is arranged on described antenna element, or be arranged on described base band processing device, described detector is connected with described signal processor, for detecting the channel quality information between described same user terminal each antenna element corresponding to described multiple antenna element.
6. system according to claim 5, is characterized in that, described detector comprises:
Cache module, for the frequency pilot sign in buffered signal transmission;
Channel estimation module, is connected with described cache module, for determining described channel quality information by described frequency pilot sign.
7. system according to claim 5, is characterized in that, described detector comprises:
Go CP module, for removing the Cyclic Prefix of the signal that corresponding described antenna element exports;
FFT module, carries out fast Fourier transform for the signal exported corresponding described antenna element.
8. system according to claim 1, is characterized in that, described base band processing device also comprises:
Memory module, for storing the corresponding table of subscriber equipment and antenna element, wherein, described correspondence table stores the corresponding relation of subscriber equipment and antenna element, described signal processor is connected with described memory module, the signal of described signal processor also for selecting the antenna element corresponding with user terminal to send according to subscriber equipment with the corresponding relation of antenna element, is sent to described baseband processing chip.
9. a spaced antenna signal processing method, is characterized in that, comprising:
Receive the multiple signals that sent by multiple antenna element, wherein, described multiple signals are that the radiofrequency signal being sent to described multiple antenna element by same user terminal transforms the digital signal obtained;
According to the road signal that the channel quality information between described same user terminal and described multiple antenna element is determined from described multiple signals;
The road signal determined is sent to baseband processing chip.
10. a spaced antenna signal processing apparatus, is characterized in that, comprising:
Receiving element, for receiving the multiple signals sent by multiple antenna element, wherein, described multiple signals are that the radiofrequency signal being sent to described multiple antenna element by same user terminal transforms the digital signal obtained;
Determining unit, for the road signal determined from described multiple signals according to the channel quality information between described same user terminal and described multiple antenna element;
Transmitting element, for being sent to baseband processing chip by determine one road signal.
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Application publication date: 20160224 |