CN101350647B - Method and system for processing multi-antenna signal - Google Patents
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Abstract
The present invention discloses a method of processing multi-antenna signals. When the method is used, a single baseband unit BBU in the distributed base station system can support a plurality of antennas which surpass the self designed capacity of the base station system, so as to satisfy the needs of development of communication. Moreover, the network building costs are reduced. In the method, a radio frequency remote unit RRU can respectively transform the multi-channel analog signals received by a plurality of antennas into the corresponding digital signals; the RRU complete the vector superposition of the multi-channel digital signals which are acquired from the multi-channel analog signals of the same subcarrier, according to the same time position; then the multi-channel digital signals are combined to form the digital signals of one path. The present invention also discloses a BBU, a base-band interface unit, a RRU and a system.
Description
Technical field
The present invention relates to the communications field, particularly relate to the method and system of processing multi-antenna signal.
Background technology
Along with developing rapidly of communication user and communication service, existing antenna amount can not satisfy the demands, and for communication system is carried out dilatation, a kind of mode is the quantity that increases antenna, and another kind of mode is that multiple signals are merged into one road signal.
In traditional base station system, what transmit between base band and transceiver is analog signal.Can directly superpose to analog signal by transmission line, and send to the base band side and process.But in the process of transmitting of analog signal, along with the increase of transmission range, analog signal is decay constantly.In the long-distance transmissions process that realizes analog signal, usually use trunking (such as the dried station of putting) that analog signal is amplified processing, the realization non-blind area covers, but, in amplified analog signal, also amplified noise signal, generation has a strong impact on to signal quality, and has larger power consumption, and there is the not shortcoming of easy care in trunking.
At present, occur a kind of Remote Radio Technique in the prior art, the radio frequency unit in the base station is zoomed out, place near the antenna.In this way, realized that a Base Band Unit (BBU) can connect a plurality of Remote Radio Unit (RRU), and owing to being subject to the restriction of existing hardware level, the base band demodulating of BBU can only support to be no more than many antennas of designed capacity, for example a BBU supports at most 6 subcarriers (representing with C), 8 antennas (representing with A), then supports at most 48 road signals.Because there are some defectives in analog signal, then consider to realize that by the mode that increases antenna amount non-blind area covers, and the disposal ability of a BBU is limited, so this just needs to increase the dilatation that BBU realizes communication system.Yet the cost compare of BBU is high, brings pressure to dilatation work.
As seen, prior art is supported more semaphore by the mode of superposed simulation signal, covers to realize non-blind area, and this mode exists transmission range shorter, is subjected to noise signal to disturb larger problem.Perhaps, prior art is supported more antenna by the mode that increases BBU, covers to realize non-blind area, and this mode is so that the cost of networking and maintenance is higher.
Summary of the invention
The embodiment of the invention provides a kind of method and system of processing multi-antenna signal, be used for to realize making single BBU support to surpass many antennas of self designed capacity at distributed base station system, satisfying the growth requirement of the communications field, and reduces the networking cost.
A kind of method of processing multi-antenna signal may further comprise the steps:
Radio frequency remote unit RRU with many antenna receptions to multichannel analog signals be converted to respectively corresponding digital signal;
Described RRU is according to the same time position, the resulting multiply digital signals of the analog signal of same sub-carrier carried out vector superposed, and described multiply digital signals is merged into a railway digital signal.
A kind of method of processing multi-antenna signal comprises step:
The first radio frequency remote unit RRU with antenna reception to multichannel analog signals be converted to corresponding digital signal, and the digital signal that receives the 2nd RRU output;
A described RRU is according to the same time position, multiply digital signals corresponding to same sub-carrier carried out vector superposed, and described multiply digital signals is merged into a railway digital signal.
A kind of method of processing multi-antenna signal may further comprise the steps:
Baseband interface unit B IU receives multiply digital signals from a plurality of radio frequency remote unit RRU;
Described BIU is according to the same time position, and the multiply digital signals that same sub-carrier is corresponding carries out vector superposed, and multiply digital signals is merged into a railway digital signal and output.
A kind of method of processing multi-antenna signal may further comprise the steps:
Baseband processing unit BBU receives the multiply digital signals from a plurality of radio frequency remote unit RRU;
Described BBU is according to the same time position, the multiply digital signals of corresponding same sub-carrier carried out vector superposed, multiply digital signals merged into a railway digital signal, and carry out baseband digital signal and process.
A kind of method of processing multi-antenna signal may further comprise the steps:
The radio frequency remote unit RRU receiving digital signals, and described digital signal copied as multiply digital signals;
The described multiply digital signals that described RRU will obtain is converted to respectively corresponding multichannel analog signals, and multichannel analog signals is sent to respectively each antenna.
A kind of distributed base station system comprises:
Radio frequency remote unit RRU, be used for from the many up analog signals of antenna reception, be digital signal with analog signal conversion, and multiply digital signals corresponding to same sub-carrier carried out vector superposed to merge on the way line number word signal, and the descending digital signal that will receive copies as multiply digital signals, and multiply digital signals is converted to respectively analog signal, output to described many antennas;
Base Band Unit BBU is used for receiving digital uplink signal and carries out the baseband digital signal processing, and descending digital signal carried out baseband digital signal process and export.
A kind of distributed base station system comprises:
A plurality of radio frequency remote unit RRU, be used for will many antenna receptions to multichannel analog signals be converted to respectively corresponding digital signal and export;
Baseband interface unit B IU is used for according to the same time position, multiply digital signals corresponding to same sub-carrier in the multiply digital signals of described a plurality of RRU is carried out vector superposed, and multiply digital signals is merged into a railway digital signal, and output;
Base Band Unit BBU receives the digital signal of described BIU transmission and carries out baseband digital signal and process.
A kind of Remote Radio Unit comprises:
Radio frequency unit is used for to many antennas transmission radiofrequency signals with from these many line received RF signals;
Intermediate frequency unit, being used for up analog signal conversion is digital signal, and descending digital signal is converted to analog signal;
Merging/allocation units are used in up link, multiply digital signals corresponding to same sub-carrier are carried out vector superposed according to the same time position, and multiply digital signals is merged into a railway digital signal; And in down link, digital signal is copied as multiply digital signals;
External interface unit is used for receiving and sending digital signal.
A kind of baseband interface unit comprises:
The remote radio interface unit is used for from a plurality of Remote Radio Unit receiving digital signals, and sends digital signal to a plurality of Remote Radio Unit;
Merging/allocation units, vector superposed for multiply digital signals corresponding to up multiply digital signals same sub-carrier carried out according to the same time position, multiply digital signals is merged into a railway digital signal; And be multiply digital signals with a descending railway digital signal replication;
The baseband interface unit is used for to Base Band Unit transmission digital signal with from this Base Band Unit receiving digital signals.
A kind of Base Band Unit comprises:
External interface unit is used for receiving and sending multiply digital signals;
Merging/allocation units are used in up link, multiply digital signals corresponding to same sub-carrier are carried out vector superposed according to the same time position, and multiply digital signals is merged into a railway digital signal; And in down link, the digital signal after processing is copied as multiply digital signals;
Baseband processing unit is used for carrying out the processing of baseband digital signal.
The method that the embodiment of the invention provides a kind of multi-antenna digital signal phasor to merge has realized that single BBU supports many antennas above self designed capacity, has reduced cost when realizing the distributed base station system dilatation.Simultaneously, the embodiment of the invention is to the not strict restriction of the number of BBU, BIU and RRU, can be series, parallel or chaotic structure between a plurality of RRU, make network system can consist of the network configurations such as chain net, tree type network and stellate reticulum, be convenient to further dilatation and the flexible networking of distributed base station system.And the BBU in the embodiment of the invention, BIU and RRU all can realize the merging of multiply digital signals, and the dilatation ability of communication network is increased substantially.By each BBU, BIU and RRU are carried out control and management, can adjust flexibly according to the semaphore of zones of different the quantity of the digital signal of needs merging, be applicable to variety of network environments and communication system.
Description of drawings
Fig. 1 is the method flow diagram that merges multiply digital signals in the embodiment of the invention;
Fig. 2 is the method flow diagram of the merging multiply digital signals when avoiding signal to overflow in the embodiment of the invention;
Fig. 3 is the method flow diagram of distribution digital signal in the embodiment of the invention;
Fig. 4 is the basic block diagram of distributed base station system in the embodiment of the invention;
Fig. 5 is the structure chart when distributed base station system comprises BIU in the embodiment of the invention;
Fig. 6 A is when BIU is a plurality of in the embodiment of the invention, the structure chart of distributed base station system;
Fig. 6 B is when BBU is a plurality of in the embodiment of the invention, the structure chart of distributed base station system;
Fig. 7 is the structure chart when distributed base station system comprises OM in the embodiment of the invention;
Fig. 8 is the structure chart of RRU in the embodiment of the invention;
Fig. 9 is the schematic diagram of the inter-process flow process of RRU in the embodiment of the invention;
Figure 10 is the structure chart of BIU in the embodiment of the invention;
Figure 11 is the schematic diagram of the inter-process flow process of BIU in the embodiment of the invention;
Figure 12 is the structure chart of BBU in the embodiment of the invention;
Figure 13 is a kind of method flow diagram of processing the multi-antenna digital signal in UL in the embodiment of the invention;
Figure 14 is a kind of method flow diagram of processing the multi-antenna digital signal in DL in the embodiment of the invention;
Figure 15 is the another kind of method flow diagram of processing the multi-antenna digital signal in UL in the embodiment of the invention;
Figure 16 is the another kind of method flow diagram of processing the multi-antenna digital signal in DL in the embodiment of the invention.
Embodiment
The mode of the embodiment of the invention by multiply digital signals is merged makes the BBU in the distributed base station system support more antenna.
The basic technical scheme of the present embodiment is: in up link (UL), the identical multiply digital signals of subcarrier is carried out according to the same time position vector superposed, to merge into a railway digital signal; And in down link (DL), be multiply digital signals with a railway digital signal replication, and be mapped to respectively each port transmission.Wherein, the quantity of the duplicated multiply digital signals of needs depends on the quantity of corresponding port.
Referring to Fig. 1, RRU is as follows to the method flow that multiply digital signals merges in the present embodiment:
Step 101: will from many antenna receptions to multichannel analog signals be converted to respectively corresponding digital signal, obtained simultaneously the corresponding relation of multichannel analog signals and multiply digital signals; Every antenna can be multi-subcarrier antenna or list carrier antenna.
Step 102: according to the corresponding relation of analog signal and subcarrier and the corresponding relation of analog signal and digital signal, determine respectively subcarrier corresponding to each railway digital signal.
Step 103: according to the principle of time synchronized, corresponding same sub-carrier and the multiply digital signals that need to merge are carried out vector superposed operation according to the same time position, to merge into a railway digital signal.
Step 104: the digital signal that obtains is carried out the time division multiplexing operation, and send.
In step 103, determine that mode that the identical multiply digital signals of subcarrier need to merge has multiple, as a kind of mode be according to the configuration information of this locality determine from the multiply digital signals of local antenna all needs merge; Such as another kind of mode be: according to being used for the control command that signal merges configuration from Operation and Maintenance Unit (OM), for example, control command comprises the sign of antenna, such as (T1, T2, T4), then require RRU to merge by identical multiply digital signals from the subcarrier of antenna T1, T2 and T4.Perhaps, the form of control command is such as (T1, T2), (T3, T4) then needs and will merge into one the tunnel from the digital signal of antenna T1 and T2, and will merge into one the tunnel from the digital signal of antenna T3 and T4, as do not receive control command, default to and do not carry out the signal merging.Such as another mode: define a kind of transmission channel (can claim the CA passage), for example, BBU supports 6C/8A, then can be with antenna of a subcarrier as a CA passage, CA channel C A0, CA1...CA47 are arranged, be the sign of each subcarrier mark CA passage of every antenna by configuration file or control command, such as CA1, determine that then the multiply digital signals of corresponding identical CA gap marker needs to merge.
The concrete mode that digital signal merges in step 103 is: with the multiply digital signals of corresponding same sub-carrier on the I component direction, carry out overlap-add operation according to the same time position, and with the multiply digital signals of corresponding same sub-carrier on the Q component direction, carry out overlap-add operation according to the same time position.In the present embodiment, digital signal being regarded as the continuous combination of " 1 " and " 0 ", is 1100 such as the data of a railway digital signal on a time point, and each " 1 " or " 0 " namely are data.According to identical time point, the stack of multiply digital signals is the data step-by-step addition of multiply digital signals, carries out the operation of binary addition.The present embodiment is described further by Mathematical Modeling.Suppose that the digital signal of certain time point is expressed as the form of an+jbn, a represents the data on the I component direction, and j represents Q component, and then b represents the data on the Q component direction, and n gets different values to identify each railway digital signal.So, the merging process of digital signal can be expressed as:
(a1+j*b1)+(a2+j*b2)+...+(an+j*bn)＝(a1+a2+...+an)+j*(b1+b2+...+bn)
If antenna amount is too much, may the situation that signal overflows occur when merging multiply digital signals, namely exceed the bearing capacity of transmission link.Perhaps consider the correlation of multiply digital signals, need to adopt the operation of wave beam forming.The importance of perhaps considering multiply digital signals is different, need to be weighted multiply digital signals.The present embodiment is in the situation that consider above-mentioned situation and other possiblely provides a kind of method of processing multi-antenna signal, and referring to shown in Figure 2, the concrete grammar flow process is as follows:
Step 201: will be converted to respectively digital signal from the multichannel analog signals of many antennas, antenna can be multi-subcarrier antenna or list carrier antenna, or smart antenna etc.
Step 202: each railway digital signal is carried out respectively the operation of complex multiplication, realizing wave beam forming, or realize that the effect of right shift, the signal after avoiding merging are overflowed etc.Plural s in the operation of complex multiplication (being the weight coefficient vector) can be configured by Operation and Maintenance Unit (OM).
Step 203: determine the subcarrier that each railway digital signal is corresponding.This step and step 202 are two independently operations, without strict execution sequence.
Step 204: the multiply digital signals of the corresponding same sub-carrier that needs are merged carries out vector superposed operation according to identical time location, to merge into a railway digital signal and to send.Can know the operation which digital signal need to merge by control signal or local configuration file from OM channel.
In step 202, with multiply digital signals x=[x
1, x
2..., x
n], x
iRepresent i railway digital signal, i=1,2 ... n, n represent the sum of multiply digital signals.Plural number s=[s
1, s
2..., s
n], plural s
iShape such as an+jbn, represent i railway digital signal times with plural number.The concrete operations that multiply digital signals carries out complex multiplication can be expressed as with Mathematical Modeling:
Y represents the digital signal that obtains after the complex multiplication.This operation can realize effect and/or the weighting operation of wave beam forming, and works as s
i=2
-mThe time, both realized wave beam forming, realized again having avoided signal to overflow the digital signal right shift.And, overflow s for fear of signal
1, s
2..., s
nValue can be identical.
The judgement of overflowing about signal can be expressed as:
Wherein, Saturation represents that signal demand carries out saturated processing, can judge whether thus to occur signal and overflow.Only need to carry out in the first time of digital signal the operation of complex multiplication in the merging process in the present embodiment.
Above-described embodiment has been described the method that RRU merges into multiply digital signals one railway digital signal in detail, needs to realize accordingly the distribution of digital signal.Referring to shown in Figure 3, the method flow that RRU distributes the digital signal of receiving in the present embodiment is as follows:
Step 301: receiving digital signals and demultiplexing go out multiply digital signals.
Step 302: multiply digital signals is copied as respectively multiply digital signals.
Step 303: with different weight coefficient vectors, weight coefficient vector ω is plural number, shape such as an+jbn, ω=[ω to every railway digital signal times
1+ ω
2+ ...+ω
n], wherein n represents the maximum number of subscriber equipment, the corresponding weight coefficient vector of subscriber equipment, this weight coefficient vector can be by beam scanning method (Grid ofBeam, GOB) or the many algorithms such as characteristic vector method (Eigenvalue Based Beamforming, EBB) determine.Different RRU can use identical ω, to realize that a plurality of RRU are as a plurality of subscriber equipment transmitted signals.Also can be weight coefficient vector ω
1, ω
2..., ω
nCompose different values and be weighted to be embodied as multiply digital signals, distinguish their importance.
Step 304: the multiply digital signals after will processing is converted to respectively analog signal and sends to many antennas.
Above-described embodiment has been described RRU in detail multiply digital signals has been merged into the method for a railway digital signal and the method for distribution digital signal.Since realized merging and the distribution of digital signal, so just can realize that a BBU is connected with more RRU.BBU and baseband interface unit (BIU) also can realize the merging of multiply digital signals and the operation of distribution in the present embodiment, referring to step 202-204 and step 302-303.The below is described in detail the distributed base station system in the present embodiment, and referring to shown in Figure 4, distributed base station system comprises: BBU and RRU.
BBU is used for finishing the processing to physical layer symbols level and chip-level digital signal, can connect a plurality of RRU.For example, the design maximum ability of BBU is 6C/8A, namely supports at most 48 CA passages.
It will be to send to BBU after the digital signal from the analog signal conversion of antenna that RRU is used for, and send to antenna after will being converted to analog signal from the digital signal of BBU.A plurality of RRU can be arranged, and the direct or indirect BBU that is connected to, a plurality of RRU consist of series, parallel or series-parallel connection relation to each other.A RRU can connect one or more antenna, and every antenna carries list carrier wave or multi-subcarrier, and each antenna also can be for comprising the smart antenna of a plurality of antenna elements.Direction near BBU in (or the claim cascade) structure of will connecting in the present embodiment is called the higher level, is called subordinate away from the direction of BBU (i.e. close RRU).A plurality of RRU in the cascaded structure are called the RRU in the level, and the RRU in the parallel-connection structure is called the RRU of inter-stage.For example, the designed capacity of each RRU is 3C/8A, can support 24 CA passages.According to above-mentioned for example, when BBU connects RRU more than 3 and 3, already exceed the designed capacity of BBU.
For the interface of simplifying BBU and be convenient to distributed base station system is carried out dilatation, can between BBU and RRU, increase baseband interface unit (BIU), referring to shown in Figure 5, BIU is mainly used in transmitting the digital signal between BBU and the RRU, when having connected more RRU, need and to merge into a railway digital signal and to send to BBU from the digital signal of a plurality of RRU, and will be multiply digital signals from the railway digital signal replication of BBU and be distributed to a plurality of RRU.BIU also can be a plurality of, with the antenna number of further increase BBU connection, shown in Fig. 6 A.BBU also can be a plurality of, and shown in Fig. 6 B, each BBU is connected with each BIU, and a plurality of BBU consist of series, parallel or series-parallel connection relation to each other.A plurality of BBU in the present embodiment can make things convenient for network organizing, and the quantity of these a plurality of BBU can be less than the quantity of BBU in the prior art, and for example 48 antennas need 6 BBU in the prior art, and only need 3 BBU in the present embodiment.Base band side in the present embodiment comprises BBU and BIU.
Any one BBU, BIU and RRU can merge the operation of multiply digital signals in the present embodiment, by OM or the unit of determining to carry out this operation by configuration information, comprise that the structure of distributed base station system of OM is referring to (antenna that not shown each RRU connects) shown in Figure 7.
OM (or claims C﹠amp by the control and management passage; The M passage) BBU, BIU and RRU are carried out control and management, by sending control command BBU, BIU and RRU are configured, the content of configuration comprises the union operation that whether allows to carry out digital signal, need to merge the digital signal of which antenna and carrier wave etc.For example, stipulate that certain RRU can only merge several fixing antennas; Perhaps, regulation RRU can only merge the direct-connected antenna in this locality; Perhaps, regulation RRU merges the digital signal of local and all RRU of subordinate; Perhaps, regulation only has higher level's RRU (i.e. the direct RRU that is connected with the base band side) to carry out union operation; Perhaps, regulation BIU merges the part or all of digital signal from all RRU.
The below is described in detail the structure of BBU, BIU and RRU respectively.
Referring to Fig. 8, RRU comprises radio frequency unit 801, intermediate frequency unit 802, merging/allocation units 803, multiplex/demultiplex unit 804, external interface unit 805 and master control and clock synchronous unit 806 in the present embodiment.
Merging/allocation units 803, in UL, the control command of sending according to configuration information or OM, the multiply digital signals identical to part or all of subcarrier carries out vector superposed according to the same time position, to merge into a railway digital signal, before overlap-add operation, can multiply by respectively the weight coefficient vector to multiply digital signals; And in DL, each railway digital signal is copied as respectively multiply digital signals, can further multiply by respectively the weight coefficient vector to the multiply digital signals after copying.Merging/allocation units 803 can comprise a plurality of merging/distribution subelement, and each merges/distribute subelement and is responsible for merging and the distribution of part multiply digital signals.
Multiplex/demultiplex unit 804 according to the control command that configuration information or OM send, is a railway digital signal with multichannel digital uplink signal time division multiplexing; Decomposition multiplex is multiply digital signals during with one tunnel descending digital signal.
Master control and clock synchronous unit 806, the clock of control and synchronous radio frequency unit 801, intermediate frequency unit 802, merging/allocation units 803, multiplex/demultiplex unit 804 and external interface unit 805.
More than described the basic composition unit of RRU inside, the processing procedure of brief description RRU inside is referring to shown in Figure 9.
In up link (UL), intermediate frequency unit 802 is digital signal with analog signal conversion, and 803 pairs of multiply digital signals of merging/allocation units carry out union operation, and the 804 pairs of multiply digital signals in multiplex/demultiplex unit carry out time division multiplexing.If external interface unit 805 receives the digital signal that other RRU sends, and need to carry out union operation to the digital signal that receives, then the 804 pairs of digital signals of receiving in multiplex/demultiplex unit are carried out demultiplexing, 803 pairs of digital signals of receiving of merging/allocation units are carried out union operation with local digital signal, this merging process can carry out after the union operation of local digital signal, also can merge without the digital signal that merges with this locality, digital signal was multiplexing after then multiplex/demultiplex unit 804 will merge is one or more digital signal and superior transmission.Before union operation, can carry out respectively to multiply digital signals the operation of complex multiplication.The concrete merging mode of union operation is for example: configure 10 transmission channels, obtain 30 railway digital signals after the analog-to-digital conversion, per 3 railway digital signals are merged into a railway digital signal and corresponding 1 transmission channel; Perhaps 5 railway digital signals do not participate in merging and corresponding 5 transmission channels, and 25 railway digital signals are merged into 5 railway digital signals and corresponding 5 transmission channels in addition.
In down link (DL), the 804 pairs of digital signals of receiving in multiplex/demultiplex unit are carried out demultiplexing, obtain multiply digital signals, merging/allocation units 803 copy as respectively multiply digital signals with each railway digital signal, and intermediate frequency unit 802 is converted to multiply digital signals multichannel analog signals and sends to radio frequency unit 801.After copy operation, can carry out respectively to multiply digital signals the operation of complex multiplication.For example distribute the concrete copy mode of operation: this RRU disposes 10 transmission channels, 3 equal corresponding transmission channel 1-5 of antenna in 6 antennas of its connection, other is 3 equal corresponding transmission channel 6-10 of antenna, 2 parts of 10 railway digital signal replications that then need 10 transmission channels that will obtain, obtain 30 railway digital signals, i.e. 3 groups of digital signals, each group is 10 identical railway digital signals; Perhaps, 3 antennas are corresponding transmission channel 1-3 respectively, and 3 equal corresponding transmission channel 4-10 of antenna in addition then need the 4-10 railway digital signal in the 10 railway digital signals of 10 transmission channels that will obtain to copy, obtain 3 groups of totally 21 railway digital signals, 1-3 railway digital signal does not need to copy.
Referring to Figure 10, the BIU in the present embodiment comprises: remote radio interface unit 1001, merging/allocation units 1002, multiplex/demultiplex unit A1003, multiplex/demultiplex unit B 1004, baseband interface unit 1005 and master control and clock synchronous unit 1006.
Remote radio interface unit 1001 connects a plurality of RRU, and mutual with these a plurality of RRU.At up direction, receiving digital signals is if what receive is the light digital signal, then the light digital signal is converted to electric digital signal, and electric digital signal is gone here and there and changed line decoding, produce parallel digital signal, send to other unit of BIU inside.At down direction, parallel digital signal is carried out line coding, parallel-serial conversion, send after producing serial electricity digital signal, if be connected with outside by optical fiber, send after then electric digital signal being converted to the light digital signal, if be connected with outside by cable, then directly send electric digital signal.Remote radio interface unit 1001 comprises a plurality of ports, and a port connects a RRU.This port is applicable to various protocols, zooms out interface (TD-SCDMA Remote Interface, TDRI) agreement etc. such as common public radio interface (Common Public Radio Interface, CPRI) agreement, TD-SCDMA.
Multiplex/demultiplex unit A1003, the control command of sending according to configuration information or OM, decomposition multiplex is multiply digital signals during a railway digital signal that remote radio interface unit 1001 is sent, and is to send to remote radio interface unit 1001 behind the railway digital signal with the multiply digital signals time division multiplexing.
Merging/allocation units 1002, the control command of sending according to configuration information or OM, in UL, the multiply digital signals identical to part or all of subcarrier carries out vector superposed according to the same time position, to merge into a railway digital signal, before overlap-add operation, can multiply by respectively the weight coefficient vector to multiply digital signals; And in DL, each railway digital signal is copied as respectively multiply digital signals, can further multiply by respectively the weight coefficient vector to the multiply digital signals after copying.Merging/allocation units 1002 can comprise a plurality of merging/distribution subelement, and each merges/distribute subelement and is responsible for merging and the distribution of part multiply digital signals.
Multiplex/demultiplex unit B 1004, the control command of sending according to configuration information or OM, the multiply digital signals time division multiplexing that merging/allocation units 1002 are sent is a railway digital signal, and decomposition multiplex is to send to merging/allocation units 1002 behind the multiply digital signals during with a railway digital signal.
Master control and clock synchronous unit 1006, the clock of control and synchronous remote radio interface unit 1001, merging/allocation units 1002, multiplex/demultiplex unit A1003, multiplex/demultiplex unit B 1004 and baseband interface unit 1005.
More than described the basic composition unit of BIU inside, the processing procedure of brief description BIU inside is referring to shown in Figure 11.
In up link (UL), multiplex/demultiplex unit A1003 carries out demultiplexing to the digital signal of receiving, obtain multiply digital signals, 1002 pairs of multiply digital signals of merging/allocation units carry out union operation, multiply digital signals after multiplex/demultiplex unit B 1004 is combined carries out time division multiplexing, obtains a railway digital signal.Before union operation, can carry out respectively to multiply digital signals the operation of complex multiplication.The concrete merging mode of union operation is for example: configure 10 transmission channels, obtain 30 railway digital signals by a plurality of RRU, per 3 railway digital signals are merged into a railway digital signal and corresponding 1 transmission channel; Perhaps 5 railway digital signals do not participate in merging and corresponding 5 transmission channels, and 25 railway digital signals are merged into 5 railway digital signals and corresponding 5 transmission channels in addition.
In down link (DL), 1004 pairs of digital signals of receiving of multiplex/demultiplex unit B are carried out demultiplexing, obtain multiply digital signals, merging/allocation units 1002 copy as respectively multiply digital signals with each railway digital signal, multiplex/demultiplex unit A1003 carries out time division multiplexing to multiply digital signals, obtains one or more digital signal.After copy operation, can carry out respectively to multiply digital signals the operation of complex multiplication.For example distribute the concrete copy mode of operation: this BIU disposes 10 transmission channels, 3 equal corresponding transmission channel 1-5 of RRU among its direct-connected 6 RRU, other is 3 equal corresponding transmission channel 6-10 of RRU, 2 parts of 10 railway digital signal replications that then need 10 transmission channels that will obtain, obtain 30 railway digital signals, i.e. 3 groups of digital signals, each group is 10 identical railway digital signals; Perhaps, 3 RRU are corresponding transmission channel 1-3 respectively, and 3 equal corresponding transmission channel 4-10 of RRU in addition then need the 4-10 railway digital signal in the 10 railway digital signals of 10 transmission channels that will obtain to copy, obtain 3 groups of totally 21 railway digital signals, 1-3 railway digital signal does not need to copy.
Referring to Figure 12, the BBU in the present embodiment comprises: external interface unit 1201, multiplex/demultiplex unit 1206, merging/allocation units 1202, base band data I/Q control unit 1203, baseband processing unit 1204 and master control and clock synchronous unit 1205.
Multiplex/demultiplex unit 1206, the control command of sending according to configuration information or OM, decomposition multiplex is multiply digital signals during a railway digital signal that external interface unit 1201 is sent, and is to send to external interface unit 1201 behind the railway digital signal with the multiply digital signals time division multiplexing.
Merging/allocation units 1202, the control command of sending according to configuration information or OM, in UL, the multiply digital signals identical to part or all of subcarrier carries out vector superposed according to the same time position, to merge into a railway digital signal, before overlap-add operation, can multiply by respectively the weight coefficient vector to multiply digital signals; And in DL, each railway digital signal is copied as respectively multiply digital signals, can further multiply by respectively the weight coefficient vector to the multiply digital signals after copying.Merging/allocation units 1202 can comprise a plurality of merging/distribution subelement, and each merges/distribute subelement and is responsible for merging and the distribution of part multiply digital signals.
Base band data I/Q control unit 1203, being used for baseband processing unit 1204 and merging/allocation units 1202, to carry out interface adaptive.
Master control and clock synchronous unit 1205, control and synchronous external interface unit 1201, multiplex/demultiplex unit 1206, merging/allocation units 1202, base band data I/Q control unit 1203 and baseband processing unit 1204.
The basic composition unit of BBU inside has more than been described, the processing procedure of brief description BBU inside.
In up link (UL), the 1206 pairs of digital signals of receiving in multiplex/demultiplex unit are carried out demultiplexing, obtain multiply digital signals, 1202 pairs of multiply digital signals of merging/allocation units carry out union operation, and the digital signal after baseband processing unit 1204 is combined is carried out baseband digital signal and processed.Before union operation, can carry out respectively to multiply digital signals the operation of complex multiplication.
In down link (DL), 1204 pairs of digital signals of baseband processing unit are carried out baseband digital signal and are processed, merging/allocation units 1202 are multiply digital signals with the railway digital signal replication after the Base-Band Processing, the 1206 pairs of multiply digital signals in multiplex/demultiplex unit carry out time division multiplexing, obtain one or more digital signal.After copy operation, can carry out respectively to multiply digital signals the operation of complex multiplication.
By above built-in function and the structure that can clearly know respectively BBU, BIU and RRU to the description of BBU, BIU and RRU, the below describes connection and the signal transitive relation between BBU, BIU and the RRU in detail.The present embodiment makes BBU, BIU and RRU all need to merge the operation of digital signal by configuration BBU, BIU and RRU, is elaborated as example.BBU, BIU and RRU middle part subdivision merge the method flow of the operation of digital signal and can consult and carry out.
Referring to Figure 13, each RRU of configuration requirement all needs the multiply digital signals from all same sub-carrier of this locality and the RRU of subordinate is merged in UL, and the signal processing flow of distributed base station system is as follows:
Step 1301: each RRU will by antenna reception to analog signal conversion be digital signal.For example, the designed capacity of RRU is 3C/8A, then 1 corresponding at least 2 railway digital signal of subcarrier.For example have 8 RRU, 2 BIU and 1 BBU in the network, 1 BIU directly connects 2 RRU, and direct-connected each RRU connects 1 RRU.
Step 1302: each RRU carries out vector superposed operation to the identical multiply digital signals of the subcarrier of this locality according to the same time position, to merge into the multiply digital signals of one group of different sub carrier.For example, RRU carries out obtaining 3 railway digital signals behind the union operation, the subcarrier that this 3 railway digital signal is corresponding different.For convenience of description, the mutually different multiply digital signals of subcarrier is called the set of number signal each other in the present embodiment.
Each RRU can carry out first the operation of complex multiplication to multiply digital signals before carrying out vector superposed operation.
Step 1303: the RRU of subordinate is a railway digital signal with the multiply digital signals time division multiplexing of local different carrier, and superior sends.
The RRU of non-subordinate will be the multiply digital signals of different carrier from the railway digital signal demultiplexing of the RRU of subordinate, and the multiply digital signals after merging with this locality further merges, and time division multiplexing is a railway digital signal again, and superior sends.If certain RRU, then can only merge the multiply digital signals from the RRU of subordinate not by antenna receiving signal at this time point, perhaps directly transmit the digital signal from the RRU of subordinate.Perhaps certain RRU according to configuration information or control command not needs carry out union operation, then be transmitted to the higher level with this locality and from the digital signal of the RRU of subordinate.For example, this moment the higher level RRU with the 3 railway digital signals of this locality with merge into 3 railway digital signals from the 3 railway digital signals of the RRU of subordinate, then 48 railway digital signals in the level have been merged into 3 railway digital signals, obtain 1 railway digital signal after time division multiplexing.
Step 1304: higher level's RRU sends to BIU with the digital signal in the level.
Step 1305:BIU carries out respectively demultiplexing to the multiply digital signals from the RRU of each inter-stage.
Step 1306:BIU carries out vector superposed operation to the multiply digital signals of many groups different sub carrier of the RRU of each inter-stage, merging into one group of multiply digital signals, and be to send to BBU behind the railway digital signal according to configuration information with one group of multiply digital signals time division multiplexing.For example, BIU merges into 3 railway digital signals with the 6 railway digital signals that 2 RRU send, and obtains 1 railway digital signal after time division multiplexing.
Step 1307:BBU carries out respectively demultiplexing to the multiply digital signals from one or more BIU, obtains the multiply digital signals of one or more groups different sub carrier.
Step 1308:BBU carries out base band signal process to multiply digital signals.
In step 1307 and step 1308, BBU is when connecting a plurality of BIU, many groups digital signal that may receive still surpasses the designed capacity of self, then need the identical multiply digital signals of many groups digital signal sub-carriers is carried out vector superposed operation according to the same time position, obtain the multiply digital signals of one group of different sub carrier.
All need merging from all identical multiply digital signals of the subcarrier of this locality and the RRU of subordinate correspondingly with each RRU of configuration requirement, the signal processing flow of distributed base station system is as follows in DL, referring to shown in Figure 14:
The multiply digital signals that step 1401:BBU will carry out one group of different sub carrier after the Base-Band Processing copies, obtain the multiply digital signals of many group different sub carrier according to the quantity of the BIU that connects, and the multiply digital signals of one group of different sub carrier is multiplexed with a railway digital signal, send to BIU.Wherein, corresponding BIU of the multiply digital signals of one group of different sub carrier.
Step 1402:BBU carries out multiplexing operation with every group multiply digital signals, obtains many group digital signals, and every group includes only a railway digital signal, and will organize digital signal more and send to respectively each BIU.
Step 1403: the control command that each BIU sends according to local profile or OM is determined the higher level RRU of needs receiving digital signals, and the number of the higher level RRU that obtains to determine.For example multicast or broadcasting service need to send digital signal to a plurality of RRU, again for example, unicast service is only for a specific subscriber equipment, and BIU only need to send digital signal to a RRU, if consider wave beam forming, then BIU can send digital signal to a plurality of RRU.
Step 1404:BIU is many group digital signals with the set of number signal replication, and sends to respectively definite RRU according to the number of the RRU that obtains.
Step 1405: higher level's RRU obtains the multiply digital signals of one group of different sub carrier to carry out demultiplexing from the digital signal of BIU.Higher level's RRU will be transmitted to from the digital signal of BIU the RRU of subordinate simultaneously.Higher level's RRU can judge first the local subscriber equipment that whether has needs reception signal before carrying out de-multiplex operation, if there is no, then step 1405-1407 can omit.If consider wave beam forming, then can carry out subsequent step.Higher level's RRU can determine whether according to the control command that OM sends to need to send digital signal.
Step 1406: higher level's RRU copies as many group digital signals with the multiply digital signals of one group of different sub carrier.Call business for example, an antenna that only needs higher level's RRU to connect needs transmitted signal, and then copy operation can be omitted, if consider wave beam forming, the group number that copies rear acquisition can be identical with locally-attached antenna number.
Step 1407: higher level's RRU is converted to respectively analog signal with every group of digital signal, and sends to respectively the antenna of connection.Need etc. if consider wave beam forming or weighting, higher level's RRU multiply by the weight coefficient vector with multiply digital signals, and sends after being converted to respectively analog signal.
In step 1404, when definite a plurality of RRU need receiving digital signals, the railway digital signal that BIU will receive carries out demultiplexing, obtain the multiply digital signals of one group of different sub carrier, and according to the number of the RRU that obtains, the multiply digital signals of one group of different sub carrier is copied as many group digital signals, then every group of multiply digital signals carried out multiplexing operation, obtain many group digital signals, every group includes only a railway digital signal, and will organize digital signal more and send to respectively definite RRU.
When determining only to have a RRU to need receiving digital signals, after execution in step 1403, BIU directly will send to definite RRU from the railway digital signal of BBU, continue step 1405.
The RRU of subordinate receives from the operating process behind the railway digital signal of higher level RRU identical with the operating process of higher level's RRU, referring to step 1405-step 1407, does not repeat them here.
The RRU of subordinate does not need to carry out the forwarding of digital signal, but its inner digital signal processing is identical with the internal processes of higher level's RRU, also can carry out referring to step 1405-step 1407.
Referring to Figure 15, each RRU of configuration requirement only need to local or merge from the multiply digital signals of specific antenna, will transmit from the direct superior of the multiply digital signals of the RRU of subordinate in UL.Wherein can configure RRU by the mode of transmitting antenna sign, the antenna sign can have multiple, such as coding (such as 10101), numbering (such as 13), IP address, title, the IP address that reaches RRU and the combination of numbering etc.Below mainly be described in detail so that the multiply digital signals of this locality is merged into example, the signal processing flow of this distributed base station system is as follows:
Step 1501: each RRU will by antenna reception to analog signal conversion be digital signal.For example, the designed capacity of RRU is 3C/8A, then 1 corresponding at least 2 railway digital signal of subcarrier.
Step 1502: each RRU carries out vector superposed operation to the identical multiply digital signals of the subcarrier of this locality according to the same time position, to merge into the multiply digital signals of one group of different sub carrier.For example, after merging, RRU obtains one group of 3 railway digital signal, the subcarrier that this 3 railway digital signal is corresponding different.
Each RRU can carry out first the operation of complex multiplication to multiply digital signals before carrying out vector superposed operation.
Step 1503: each RRU is multiplexed with a railway digital signal with the multiply digital signals of local different carrier, and sends in conjunction with one or more digital signal superior from the RRU of subordinate.The RRU of subordinate only needs superior to send local digital signal.
Step 1504: higher level's RRU sends to BIU with the multiply digital signals in the level.
Step 1505:BIU carries out demultiplexing to the multiply digital signals from each higher level's RRU, obtains many group digital signals.
Step 1506:BIU carries out vector superposed operation to the multiply digital signals of many groups different sub carrier of each RRU of inter-stage, merging into one group of multiply digital signals, and sends to BBU after multiplexing.
Step 1507:BBU carries out demultiplexing to the multiply digital signals from one or more BIU respectively, obtains corresponding one or more groups digital signal.
Step 1508: when BBU connected a plurality of BIU, BBU carried out vector superposed operation to the identical multiply digital signals of many groups digital signal sub-carriers according to the same time position, obtains the multiply digital signals of one group of different sub carrier.
When BBU only connects a BIU, from the digital signal of a BIU behind demultiplexing, obtain the multiply digital signals identical with number of subcarriers, obviously be no more than the ability of BBU self design, but skips steps 1508, directly execution in step 1509 realizes that BBU directly carries out base band signal process to this group of multiply digital signals.
Step 1509:BBU carries out base band signal process to the multiply digital signals of one group of different sub carrier.
Because the configuration mode of BBU, BIU and RRU has multiple, when the RRU that only has higher level in the configuration requirement cascaded structure need to carry out union operation, the operating process of so higher level's RRU is with step 1501-step 1504, and other RRU in the cascaded structure then can an execution in step 1501 and 1503.Perhaps, each RRU is according to configuration requirement, will merge from the digital signal of the part antenna of the RRU of subordinate.All RRU do not need to carry out union operation when configuration requirement, and only need to merge multiply digital signals by BIU, and then higher level's RRU can an execution in step 1501,1503 and 1504.
And when the RRU that only has higher level in the configuration requirement cascaded structure need to carry out union operation, higher level's RRU can carry out the operation of complex multiplication to the digital signal that obtains first before carrying out union operation; Perhaps, higher level's RRU only carries out the operation of complex multiplication to the digital signal of this locality before carrying out union operation, and other RRU in the cascaded structure is again superior output after the operation of local separately digital signal being carried out complex multiplication.
Only need to local or merge from the multiply digital signals of specific antenna, will transmit from the direct superior of the multiply digital signals of the RRU of subordinate with each RRU of configuration requirement.Below mainly be described in detail correspondingly the multiply digital signals of this locality is merged into example, the signal processing flow of this distributed base station system is as follows in DL, referring to shown in Figure 16:
The multiply digital signals that step 1601:BBU will carry out one group of different sub carrier after the Base-Band Processing copies, and obtains the multiply digital signals of many group different sub carrier.
Step 1602:BBU sends to BIU after the multiply digital signals of every group of different sub carrier is multiplexed with a railway digital signal.
Step 1603: the number that each BIU determines to need the RRU of receiving digital signals and obtains definite RRU.This RRU is higher level's RRU.
Step 1604: when definite a plurality of RRU needed receiving digital signals, one or more digital signal that BIU will receive was carried out demultiplexing, obtained corresponding one or more groups multiply digital signals, every group of multiply digital signals that comprises different sub carrier.
Step 1605:BIU is according to the number of the RRU that obtains, and the multiply digital signals of one group of different sub carrier is copied as many group digital signals, perhaps, with in many groups digital signal of receiving partly or entirely digital signal copy as respectively multiply digital signals.
Step 1606:BIU is with the multiplexing rear definite RRU that sends to respectively of multiply digital signals.If RRU does not have copying and distributes the ability of digital signal, then BIU need to send digital signal after multiplexed to RRU.
When determining only to have a RRU to need receiving digital signals, after execution in step 1603, BIU directly will send to from the digital signal of BBU definite RRU, continue step 1607.
Step 1607: higher level's RRU obtains the multiply digital signals of one group of different sub carrier to carry out demultiplexing from the set of number signal in the digital signal of BIU.Higher level's RRU directly is transmitted to the RRU of subordinate with other many group digital signals.Call business for example, higher level's RRU is determining this call business and the local operation that can omit demultiplexing when irrelevant, directly transmit digital signal to the RRU of subordinate, if consider wave beam forming, higher level's RRU also can by locally-attached antenna transmitted signal, then need to carry out the operation of demultiplexing.
Step 1608: higher level's RRU copies as many group digital signals with the multiply digital signals of one group of different sub carrier.Unicast service for example, an antenna that only needs higher level's RRU to connect needs transmitted signal, and then copy operation can be omitted, if consider wave beam forming, the group number that copies rear acquisition can be identical with locally-attached antenna number.
Step 1609: higher level's RRU is converted to respectively analog signal with the multiply digital signals of every group of different sub carrier, and sends to respectively each antenna of connection.If consider wave beam forming or weighting etc., higher level's RRU multiply by the weight coefficient vector with multiply digital signals, and sends after being converted to respectively analog signal.
The RRU of subordinate receives from the operating process after the digital signal of higher level RRU identical with the operating process of higher level's RRU, referring to step 1607-step 1609, does not repeat them here.
The RRU of subordinate does not need to carry out the forwarding of digital signal, but its inner digital signal processing is identical with the internal processes of higher level's RRU, also can carry out referring to step 1607-step 1609.
The method that the embodiment of the invention provides a kind of multi-antenna digital signal phasor to merge has realized that BBU connects many antennas above self designed capacity, has reduced cost when realizing the distributed base station system dilatation.Simultaneously, the embodiment of the invention is to the not strict restriction of the number of BBU, BIU and RRU, can be series, parallel or hybrid connected structure between a plurality of RRU, make network system can consist of the network configurations such as chain net, tree type network and stellate reticulum, be convenient to further dilatation and the flexible networking of distributed base station system.And the BBU in the embodiment of the invention, BIU and RRU all can realize merging and the distribution of multiply digital signals, and the dilatation ability of communication network is increased substantially.By each BBU, BIU and RRU are carried out control and management, can adjust flexibly according to the semaphore of zones of different the quantity of the digital signal of needs merging, be applicable to variety of network environments and communication system.And, BBU in the present embodiment, BIU and RRU are merging and are considering wave beam forming during the distribution multiply digital signals, are convenient to adopt multiplexing, classification, wave beam forming and advance the transmission quality that modes such as having more (MIMO) improves network carrying ability and guarantees signal more according to various external environment conditions.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (20)
1. a method of processing multi-antenna signal is characterized in that, may further comprise the steps:
Radio frequency remote unit RRU with many antenna receptions to multichannel analog signals be converted to respectively corresponding digital signal;
Described RRU is according to the same time position, the resulting multiply digital signals of the analog signal of same sub-carrier carried out vector superposed, and described multiply digital signals is merged into a railway digital signal.
2. the method for processing multi-antenna signal as claimed in claim 1 is characterized in that, described vector superposed operating procedure comprises: the data step-by-step of multiply digital signals is carried out the operation of binary addition.
3. the method for processing multi-antenna signal as claimed in claim 1 is characterized in that, described RRU carried out the complex multiplication operation to described multiply digital signals respectively before carrying out vector superposed operation.
4. a method of processing multi-antenna signal is characterized in that, comprises step:
The first radio frequency remote unit RRU with antenna reception to multichannel analog signals be converted to corresponding digital signal, and the digital signal that receives the 2nd RRU output;
A described RRU is according to the same time position, multiply digital signals corresponding to same sub-carrier carried out vector superposed, and described multiply digital signals is merged into a railway digital signal.
5. the method for processing multi-antenna signal as claimed in claim 4 is characterized in that, a described RRU carried out the complex multiplication operation to described multiply digital signals respectively before carrying out vector superposed operation.
6. the method for processing multi-antenna signal as claimed in claim 4 is characterized in that, described the 2nd RRU carried out the complex multiplication operation to described digital signal respectively before the digital signal of output.
7. a method of processing multi-antenna signal is characterized in that, may further comprise the steps:
Baseband interface unit B IU receives multiply digital signals from a plurality of radio frequency remote unit RRU;
Described BIU is according to the same time position, and the multiply digital signals that same sub-carrier is corresponding carries out vector superposed, and multiply digital signals is merged into a railway digital signal and output.
8. the method for processing multi-antenna signal as claimed in claim 7 is characterized in that, described BIU carried out the complex multiplication operation to described multiply digital signals respectively before carrying out vector superposed operation.
9. a method of processing multi-antenna signal is characterized in that, may further comprise the steps:
Baseband processing unit BBU receives the multiply digital signals from a plurality of radio frequency remote unit RRU;
Described BBU is according to the same time position, the multiply digital signals of corresponding same sub-carrier carried out vector superposed, and multiply digital signals is merged into a railway digital signal.
10. the method for processing multi-antenna signal as claimed in claim 9 is characterized in that, described BBU carried out the complex multiplication operation to described multiply digital signals respectively before carrying out vector superposed operation.
11. a distributed base station system is characterized in that, comprising:
Radio frequency remote unit RRU, be used for from the many up analog signals of antenna reception, be digital signal with analog signal conversion, and according to identical time location, multiply digital signals corresponding to same sub-carrier carried out vector superposed to merge on the way line number word signal, and the descending digital signal that will receive copies as multiply digital signals, and multiply digital signals is converted to respectively analog signal, outputs to described many antennas;
Base Band Unit BBU is used for receiving digital uplink signal and carries out the baseband digital signal processing, and descending digital signal carried out baseband digital signal process and export.
12. distributed base station system as claimed in claim 11 is characterized in that, this distributed base station system comprises a plurality of RRU, wherein, and at least two RRU cascades, and comprise the described RRU of claim 11 at least among the RRU of two cascades.
13. distributed base station system as claimed in claim 12, it is characterized in that, the described RRU of claim 11 receives the digital signal of other RRU, and the described RRU of claim 11 merges processing with the digital signal of this locality with from the digital signal of other RRU; And the described RRU of claim 11 is transmitted to other RRU with descending digital signal.
14. distributed base station system as claimed in claim 11 is characterized in that, this distributed base station system comprises a plurality of RRU, wherein, and at least two RRU parallel connections, and comprise the described RRU of claim 11 at least among the RRU of two parallel connections; Described BBU receives the multiply digital signals of at least two RRU, and before carrying out the baseband digital signal processing, according to identical time location, the multiply digital signals that same sub-carrier is corresponding carries out vector superposed, to merge into a railway digital signal; And described BBU carries out baseband digital signal to descending digital signal and processes, and the descending digital signal after processing is copied as multiply digital signals, and respectively output.
15. each the described distributed base station system as in the claim 11 to 14 is characterized in that, comprises one or more baseband interface unit B IU, is used for the digital uplink signal of a plurality of RRU is transmitted to described BBU.
16. distributed base station system as claimed in claim 15 is characterized in that, described BIU directly transmits the digital uplink signal that receives, and the descending digital signal that described BIU will receive directly is transmitted to a plurality of RRU; Perhaps
Described BIU is according to the same time position, the multichannel digital uplink signal of corresponding same sub-carrier in the multichannel digital uplink signal that receives is carried out vector superposed, merging on the way line number word signal, and output; And the descending digital signal that described BIU will receive copies as multiply digital signals, and sends to a plurality of RRU respectively.
17. a distributed base station system is characterized in that, comprising:
A plurality of radio frequency remote unit RRU, be used for will many antenna receptions to multichannel analog signals be converted to respectively corresponding digital signal and export;
Baseband interface unit B IU is used for according to the same time position, multiply digital signals corresponding to same sub-carrier in the multiply digital signals of described a plurality of RRU is carried out vector superposed, and multiply digital signals is merged into a railway digital signal, and output;
Base Band Unit BBU receives the digital signal of described BIU transmission and carries out baseband digital signal and process.
18. a Remote Radio Unit is characterized in that, comprising:
Radio frequency unit is used for to many antennas transmission radiofrequency signals with from these many line received RF signals;
Intermediate frequency unit, being used for up analog signal conversion is digital signal, and descending digital signal is converted to analog signal;
Merging/allocation units are used in up link, multiply digital signals corresponding to same sub-carrier are carried out vector superposed according to the same time position, and multiply digital signals is merged into a railway digital signal; And in down link, digital signal is copied as multiply digital signals;
External interface unit is used for receiving and sending digital signal.
19. a baseband interface unit is characterized in that, comprising:
The remote radio interface unit is used for from a plurality of Remote Radio Unit receiving digital signals, and sends digital signal to a plurality of Remote Radio Unit;
Merging/allocation units, vector superposed for multiply digital signals corresponding to up multiply digital signals same sub-carrier carried out according to the same time position, multiply digital signals is merged into a railway digital signal; And be multiply digital signals with a descending railway digital signal replication;
The baseband interface unit is used for to Base Band Unit transmission digital signal with from this Base Band Unit receiving digital signals.
20. a Base Band Unit is characterized in that, comprising:
External interface unit is used for receiving and sending multiply digital signals;
Merging/allocation units are used in up link, multiply digital signals corresponding to same sub-carrier are carried out vector superposed according to the same time position, and multiply digital signals is merged into a railway digital signal; And in down link, the digital signal after processing is copied as multiply digital signals;
Baseband processing unit is used for carrying out the processing of baseband digital signal.
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| CN 200710119131 CN101350647B (en) | 2007-07-16 | 2007-07-16 | Method and system for processing multi-antenna signal |
| PCT/CN2008/001322 WO2009009959A1 (en) | 2007-07-16 | 2008-07-16 | Method and system for processing signals of multiple antennas |
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| CN 200710119131 CN101350647B (en) | 2007-07-16 | 2007-07-16 | Method and system for processing multi-antenna signal |
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| WO2009009959A1 (en) | 2009-01-22 |
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