CN103731914A - Method and device for calibrating channel reciprocity between RRHs in wireless network base station - Google Patents

Abstract

The invention relates to a method for calibrating the channel reciprocity between RRHs in a wireless network base station. The RRHs are jointly connected to a between-RRH calibrating module, and each RRH comprises an RRH internal calibrating module. The method includes the steps of selecting the between-RRH calibrating module, opening the between-RRH calibrating module under a joint transmission application scene, executing transmitting and receiving calibration with the between-RRH calibrating module, calculating a calibration weight with a base band, and applying the calibration weight to calibration of a transmitting antenna array composed of the RRHs, wherein the calibration weight comprises at least one of a between-RRH calibrating module calibrating weight, a RRH internal calibrating weight and a comprehensive weight. By means of the method, the between-RRH calibrating module calibrating weight can be easily calculated under the condition that hardware is not changed or slightly changed, the between-RRH calibrating module calibrating weight can be applied to calibration of the transmitting antenna array composed of the RRHs, and therefore the aim of calibrating the channel reciprocity between the RRHs in the wireless network base station can be achieved.

Description

Method and the device of the channel reciprocity between wireless network base station alignment RRH

Technical field

The present invention relates to cordless communication network, more specifically, relate to method and the device of the channel reciprocity between wireless network base station alignment RRH.

Background technology

Utilizing in the system of cooperative multipoint transmission technology (Coordinated Multi-Point, CoMP), system need to obtain exactly descending channel information and carry out precoding work.At time division multiplexing duplex (Time Division Duplexing, TDD) under, because uplink downlink is used the different time-gap of identical frequency range, if slot time is less than the relevant time delay of channel, the channel status of uplink and downlink has symmetry, i.e. reciprocity.CoMP system can utilize channel reciprocity directly by uplink information, to obtain downlink information and without user's feedback.This just TDD system with respect to one of considerable advantage of Frequency Division Duplexing (FDD) (Frequency Division Duplexing, FDD) system.But in real system, owing to being subject to the impact of the factors such as Doppler frequency shift that transmitting terminal do not mate with receiving terminal radio frequency link, causes because of mobility and the user side interference environment different from base station end, caused channel reciprocity unsatisfactory.How to eliminate the problem that channel reciprocity error is concerned about us.In order to guarantee channel reciprocity, must take corresponding indemnifying measure to regain channel reciprocity.

Nowadays, base station is divided into radio base band control (Radio Server) and remote radio head (Remote Radio Head, RRH) two parts conventionally.This wireless device part can be carried out separately remote setting, and then when building network flexibly, reduces Capital expenditure and the operation cost of operator.

Fig. 1 and Fig. 2 show the existing wireless self calibration solution zooming out in head (Remote Radio Head, RRH) and between RRH.

In Fig. 1, in order to realize the self calibration of RRH inside, calibration transceiver (Cal TRX) is by by multiple couplers and one and close the calibration cable network that device forms and be connected to common transceiver.Radiofrequency signal exchanges between common transceiver and calibration transceiver, thus the reciprocity of calibrating common transceiver.

Calibration solution between existing RRH is exactly that the calibration solution of RRH inside is expanded under the application scenarios of the multiple RRH that are positioned at same place simply.In the solution shown in Fig. 2, all RRH share a calibration transceiver.At all transceivers of hypothesis, have common timer and general purpose controller, can use equally the calibration algorithm that is similar to RRH internal calibration.But this solution also has a lot of problems, such as:

1) this scheme forces timing and control restriction on the RRH to all connections, even if these RRH carry out single RRH transmission individually, this has just reduced the flexibility ratio of system; Moreover,

2) there is compatible problem in the RRH being manufactured by different manufacturers, thereby has caused this solution not implement well too.

At 3GPP RAN1Tdoc for LTE and LTE-A, R1-094622, R1-093026, R1-080494, R1-090563, R1-093378, R1-094623, has proposed multiple air interface (Over The Air, OTA) the calibration solution for calibrating between RRH/eNB in 2009.The performance simulation of these OTA calibration solutions all can reach higher accuracy, but problem be, the enforcement of these solutions also depends on the support of further standard.

Therefore, in prior art, there is series of problems, for example, utilize the inner self calibration of simple RRH, can not be under multiple RRH joint transmission application scenarioss the reciprocity of calibration channel; And calibration program between traditional RRH also exists two above-mentioned aspect problems, so the channel reciprocity how to realize between wireless network base station alignment RRH under the prerequisite of minimum change still lacks effective technical scheme.

Summary of the invention

According to the understanding of the above-mentioned technical problem to background technology and existence, if can provide a kind of does not slightly change even and changes existing hardware, and can realize the method and apparatus of the channel reciprocity between wireless network base station alignment RRH simultaneously, will be highly profitable.

According to a first aspect of the invention, a kind of method of the channel reciprocity between wireless network base station alignment RRH has been proposed, wherein, described RRH is connected to the each RRH of the comprising internal calibration module in calibration module between RRH and described RRH jointly, and described method comprises: calibration module open calibration module between described RRH under joint transmission application scenarios between the selected described RRH of a.; B. utilize calibration module between described RRH carry out sending and receiving calibration and calculate calibration weight by base band; And c. is applied to described calibration weight the calibration of the transmit antenna array being comprised of described RRH, wherein, described calibration weight comprises at least one in calibration module calibration weight between RRH and RRH internal calibration weight and comprehensive weight.Utilize the method just can in the situation that hardware is not changed or slightly done a little change, calculate easily relevant such as RRH between the calibration weight of calibration module calibration weight, and calibration module calibration weight between this RRH can be applied to the calibration of the transmit antenna array being formed by RRH, just can realize thus the object of the channel reciprocity between wireless network base station alignment RRH.

In one embodiment, described step b further comprises: between the described RRH of o., calibration module is set to sending mode, by the transmitter of the transceiver of calibration module between described RRH, to the receiver of the calibration transceiver of coupled described RRH inside, sends the first calibrating signal; P. between described RRH, calibration module is set to receiving mode, by the transmitter of the calibration transceiver of described RRH inside, to the receiver of the transceiver of calibration module between described RRH, sends the 3rd calibrating signal; Q. described base band calculates calibration module calibration weight between described RRH according to the channel response in step o and p.In this form of implementation, can realize the defect that overcomes calibration steps between traditional RRH by a little change of computational algorithm.

In one embodiment, described step o further comprises: the while sends the second calibrating signal by the transmitter of the normal transceiver of described RRH inside to the receiver of the calibration transceiver of described RRH inside, wherein, described the second calibrating signal and described the first calibrating signal are mutually orthogonal; And described step p further comprises: by with described RRH between the transmitter of calibration transceiver of the described RRH inside that is connected of calibration module to the receiver of calibration module between described RRH, send the 4th calibrating signal simultaneously, wherein, described the 4th calibrating signal and described the 3rd calibrating signal are mutually orthogonal; And further comprise at described step q: described base band calculates calibration module calibration weight and comprehensive weight between RRH internal calibration weight, RRH according to the channel response in step o and p.In this form of implementation, realized the fusion of calibrating between traditional RRH internal calibration and RRH, can obtain calibration module calibration weight between RRH, RRH internal calibration weight and comprehensive weight, the redundancy of relevant parameter can be provided, thus for the dynamic switching of the associating between multiple RRH and non-joint transmission provide may.

In one embodiment, that between described RRH, calibration module comprises a port with the quantity corresponding with the quantity of connected described RRH and close device.Be somebody's turn to do and close device and can realize the multiple calibrated channels that form with other related sides.

In addition, a second aspect of the present invention has also proposed a kind of device of the channel reciprocity between wireless network base station alignment RRH, described device comprises: at least two RRH modules, wherein, the each RRH internal calibration module that comprises in described at least two RRH modules; And calibration module between RRH, it is connected with described at least two RRH modules, between described RRH, calibration module is in the RRH internal calibration module in independent calibration module or the described RRH being independent of outside described RRH, wherein, under joint transmission application scenarios, open calibration module between described RRH, carry out sending and receiving calibration and calculated calibration weight and described calibration weight is applied to the calibration of transmitted signal by base band, described calibration weight comprises at least one in calibration module calibration weight between RRH and RRH internal calibration weight and comprehensive weight.

In one embodiment, that between described RRH, calibration module comprises a port with the quantity corresponding with the quantity of connected described RRH and close device.

In one embodiment, between described RRH, in calibration module, carry out following steps:

O. between described RRH, calibration module is set to sending mode, by the transmitter of the transceiver of calibration module between described RRH, to the receiver of the calibration transceiver of coupled described RRH inside, sends the first calibrating signal;

P. between described RRH, calibration module is set to receiving mode, by the transmitter of the calibration transceiver of described RRH inside, to the receiver of the transceiver of calibration module between described RRH, sends the 3rd calibrating signal;

Q. described base band calculates calibration module calibration weight between described RRH according to the channel response in step o and p.

In one embodiment, between described RRH, in calibration module, further carry out following steps:

O '. the while sends the second calibrating signal by the transmitter of the normal transceiver of described RRH inside to the receiver of the calibration transceiver of described RRH inside, and wherein, described the second calibrating signal and described the first calibrating signal are mutually orthogonal;

P '. by with described RRH between the transmitter of calibration transceiver of the described RRH inside that is connected of calibration module to the receiver of calibration module between described RRH, send the 4th calibrating signal simultaneously, wherein, described the 4th calibrating signal and described the 3rd calibrating signal are mutually orthogonal;

Q '. described base band calculates calibration module calibration weight and comprehensive weight between RRH internal calibration weight, RRH according to the channel response in step o ' and p '.

By foundation method and apparatus of the present invention, can realize at hardware and slightly changing under the prerequisite that even work does not change, by the improvement of algorithm, overcome the defect of calibrating between traditional single RRH internal calibration and RRH, can calculate easily the relevant calibration weight such as calibration module calibration weight between RRH, and calibration module calibration weight between this RRH can be applied to the calibration of the transmit antenna array being formed by RRH, just can realize thus the object of the channel reciprocity between wireless network base station alignment RRH.

Accompanying drawing explanation

By reading the following detailed description to non-limiting example with reference to accompanying drawing, it is more obvious that other features, objects and advantages of the present invention will become.

Fig. 1 shows in prior art the structural representation at the device of the channel reciprocity of wireless network base station alignment RRH inside;

Fig. 2 shows the structural representation of the device of the channel reciprocity between wireless network base station alignment RRH in prior art;

Fig. 3 shows the flow chart according to the method for the channel reciprocity between wireless network base station alignment RRH of the present invention;

Fig. 4 shows the structural representation according to the device of the channel reciprocity between wireless network base station alignment RRH of an embodiment of the invention; And

Fig. 5 shows the structural representation according to the device of the channel reciprocity between wireless network base station alignment RRH of another execution mode of the present invention.

In the drawings, run through different diagrams, same or similar Reference numeral represents same or analogous device (module) or step.

Embodiment

Fig. 1 and Fig. 2 show respectively the hardware configuration schematic diagram of calibrating between traditional RRH internal calibration and RRH, and this structure is described in background technology, does not repeat them here.

Fig. 3 shows the flow chart according to the method for the channel reciprocity between wireless network base station alignment RRH of the present invention, as shown in the figure, the method 300 comprises following three steps, that is: first, in step 310, be in step a, calibration module open calibration module between this RRH under joint transmission application scenarios between selected RRH; Next, in step 320,, in step b, utilize calibration module between the RRH opening to carry out sending and receiving calibration and calculate calibration power by base band; Finally, in step 330, be in step c, calculated calibration weight is applied to the calibration of the transmit antenna array being formed by RRH, wherein, this RRH is connected to the each RRH of the comprising internal calibration module in calibration module between RRH and RRH jointly, and calibration weight comprises at least one in calibration module calibration weight between RRH and RRH internal calibration weight and comprehensive weight.Utilize the method just can in the situation that hardware is not changed or slightly done a little change, calculate easily calibration module calibration weight between RRH, and calibration module calibration weight between this RRH can be applied to the calibration of the transmit antenna array being formed by RRH, just can realize thus the object of the channel reciprocity between wireless network base station alignment RRH.

In one embodiment, described step b further comprises: between the described RRH of o., calibration module is set to sending mode, by the transmitter of the transceiver of calibration module between described RRH, to the receiver of the calibration transceiver of coupled described RRH inside, sends the first calibrating signal; P. between described RRH, calibration module is set to receiving mode, by the transmitter of the calibration transceiver of described RRH inside, to the receiver of the transceiver of calibration module between described RRH, sends the 3rd calibrating signal; Q. described base band calculates calibration module calibration weight between described RRH according to the channel response in step o and p.In this form of implementation, can realize the defect that overcomes calibration steps between traditional RRH by a little change of computational algorithm.

In one embodiment, described step o further comprises: the while sends the second calibrating signal by the transmitter of the normal transceiver of described RRH inside to the receiver of the calibration transceiver of described RRH inside, wherein, described the second calibrating signal and described the first calibrating signal are mutually orthogonal; And described step p further comprises: by with described RRH between the transmitter of calibration transceiver of the described RRH inside that is connected of calibration module to the receiver of calibration module between described RRH, send the 4th calibrating signal simultaneously, wherein, described the 4th calibrating signal and described the 3rd calibrating signal are mutually orthogonal; And further comprise at described step q: described base band calculates calibration module calibration weight and comprehensive weight between RRH internal calibration weight, RRH according to the channel response in step o and p.In this form of implementation, realized the fusion of calibrating between traditional RRH internal calibration and RRH, can obtain calibration module calibration weight between RRH, RRH internal calibration weight and comprehensive weight, the redundancy of relevant parameter can be provided, thus for the dynamic switching of the associating between multiple RRH and non-joint transmission provide may.

In order to realize above method, thereby realize correlation function, must need the support of relevant hardware designs.Fig. 4 shows the structural representation 400 according to the device of the channel reciprocity between wireless network base station alignment RRH of an embodiment of the invention, as shown in the figure, this device 400 does not change the internal structure 410 of single RRH, but between multiple RRH, added one by and close and between device 430 and RRH, calibrate calibration module between the RRH that transceiver 440 forms.Wherein, that between this RRH, calibration module comprises a port with the quantity corresponding with the quantity of connected RRH and close device 430.Be somebody's turn to do and close device 430 and can realize the multiple calibrated channels that form with other related sides.

Between selected described RRH, calibration module is the independent calibration module being independent of outside the calibration module 418 of RRH inside in this embodiment, so particularly when carrying out said method, obtain respectively: h in described step o and p _{c_rxcal, j}=h _ccth _{cr, j}, j=1,2 ... N and h _{c_txcal, j}=h _{ct, j}h _ccr, n=1,2 ... N, in step q according to formula: calculate calibration module calibration weight between described RRH, wherein, h _{c_rxcal, j}represent receiver calibration channel between j RRH, h _cctrepresent the transmitter channel of calibrating transceiver between RRH, h _{cr, j}represent j calibration receiver channels, h _{c_txcal, j}represent transmitter calibration channel between j RRH, h _{ct, j}represent j calibration transmitter channel, h _ccrrepresent to calibrate between RRH the receiver channels of transceiver, w _{c, j}represent the actual value of calibration weight between the RRH of j RRH internal calibration module,

the substitution value of calibration weight between the RRH of j RRH internal calibration module, w _ccrepresent the weight of calibrating transceiver between RRH; In situation, only with the step of simplifying most, calculated calibration weight between RRH, but this weight has been enough to calibrate the calibration of the transmit antenna array being comprised of RRH under joint transmission application scenarios.In addition, also can carry out RRH internal calibration simultaneously, now, by described step o and p, be obtained respectively: h _{txcal, m}=h _{bt, m}h _cr, m=1,2 ... M, h _{c_rxcal, j}=h _ccth _{cr, j}, j=1,2 ... N and h _{rxcal, m}=h _cth _{br, m}, i=1,2 ... M, h _{c_txcal, j}=h _{ct, j}h _ccr, n=1,2 ... N, and in step q by base band 450 respectively according to below formula calculate calibration module calibration weight and described comprehensive weight between described RRH internal calibration weight, described RRH: $w_m\≡\frac{h_{\mathrm{bt},m}}{h_{\mathrm{br},m}}==\frac{h_{\mathrm{txcal},m}}{h_{\mathrm{rxcal},m}}\frac{h_{\mathrm{ct}}}{h_{\mathrm{cr}}}={\tilde{w}}_m{w}_c,$ $w_{c,j}\≡\frac{h_{\mathrm{ct},j}}{h_{\mathrm{cr},j}}=\frac{h_{c\_\mathrm{txcal},j}}{h_{c\_\mathrm{rxcal},j}}\frac{h_{\mathrm{cct}}}{h_{\mathrm{ccr}}}={\tilde{w}}_{c,j}{w}_{\mathrm{cc}}$ With

m=1,2..., M; J=1,2..., N, wherein, h _{txcal, m}represent m transmitter calibration channel, h _{bt, m}represent m common transmitter channel, h _crrepresent calibration receiver channels, h _{c_rxcal, j}represent receiver calibration channel between j RRH, h _cctrepresent the transmitter channel of calibrating transceiver between RRH, h _{cr, j}represent j calibration receiver channels, h _{rxcal, m}represent m receiver calibration channel, h _ctrepresent calibration transmitter channel, h _{br, m}represent m common receiver channels, h _{c_txcal, j}represent transmitter calibration channel between j RRH, h _{cr, j}represent j calibration transmitter channel, h _ccrrepresent to calibrate between RRH the receiver channels of transceiver, w _mrepresent m RRH internal calibration weight, represent m RRH internal calibration weight, w _{c, j}represent the actual value of calibration weight between the RRH of j RRH internal calibration module,

the substitution value of calibration weight between the RRH of j RRH internal calibration module, w _ccrepresent the weight of calibrating transceiver between RRH.Realized in this embodiment the fusion of calibrating between traditional RRH internal calibration and RRH, can obtain calibration module calibration weight between RRH, RRH internal calibration weight and comprehensive weight, the redundancy of relevant parameter can be provided, thus for the dynamic switching of the associating between multiple RRH and non-joint transmission provide may.

Certainly, also can by the control of time slot etc., realize the multiplexing of calibration module between the RRH shown in Fig. 4 by RRH internal calibration module, as shown in Figure 5, between selected described RRH, calibration module is in the RRH internal calibration module 518 in described RRH in this embodiment, simultaneously, each RRH does not all do to change, 510 in figure and 520 do not do to change substantially, and just RRH internal calibration module 518 now and to close device be multiport, but not dual-port before close device now obtains: h in described step o and p _{cal, ji}=h _{cr, j}h _{ct, i}; I, j=1,2 ... N, i ≠ j, in step q by base band 550 respectively according to formula:

calculate calibration module calibration weight between described RRH, wherein, h _{cal, ji}represent the calibration channel of j transmitter to a i receiver, h _{cr, j}represent j calibration receiver channels, h _{ct, i}represent i calibration transmitter channel,

the substitution value of calibration weight between the RRH of i RRH internal calibration module, w _{c, i}the actual value of calibration weight between the RRH of i RRH internal calibration module, w _{c, 1}represent the calibration weight of himself, h _{cr, i}represent i calibration receiver channels, h _{cr, 1}represent the calibration receiver channels of calibration module between selected described RRH, h _{cl, 1}represent the calibration transmitter channel of calibration module between selected described RRH, h _{cal, 1i}represent the calibration channel of calibration module to a i receiver between selected described RRH, h _{cal, i1}represent the calibration channel of i transmitter to calibration module between selected described RRH.Additionally, also can synchronously realize in this embodiment RRH internal calibration.Now, by described step o and p, obtained respectively: h _{txcal, m}=h _{bt, m}h _cr, wherein, m=1,2 ... M, h _{rxcal, m}=h _cth _{br, m}, wherein, m=1,2 ... M and h _{cal, ji}=h _{cr, j}h _{ct, i}; I, j=1,2 ... N, i ≠ j, and in step q respectively according to below formula calculate calibration module calibration weight and described comprehensive weight between described RRH internal calibration weight, described RRH: $w_m\≡\frac{h_{\mathrm{bt},m}}{h_{\mathrm{br},m}}=\frac{h_{\mathrm{txcal},m}}{h_{\mathrm{rxcal},m}}\frac{h_{\mathrm{ct}}}{h_{\mathrm{cr}}}={\tilde{w}}_m{w}_c,$ Wherein, $w_c=\frac{h_{\mathrm{ct}}}{h_{\mathrm{cr}}},{\tilde{w}}_m=\frac{h_{\mathrm{txccal},m}}{h_{\mathrm{cxcal},m}},$ ${\tilde{w}}_{c,t}=\frac{w_{c,i}}{w_{c,1}}=\frac{h_{\mathrm{ct},i}}{h_{\mathrm{cr},i}}\frac{h_{\mathrm{cr},1}}{h_{\mathrm{ct},1}}=\frac{h_{\mathrm{cal},1i}}{h_{\mathrm{cal},i1}}$ With $w_{m,i}={\tilde{w}}_{m,i}{w}_{c,i}={\tilde{w}}_{m,i}{\tilde{w}}_{c,i}{w}_{c,1},$ Wherein, h _{txcal, m}represent m transmitter calibration channel, h _{bt, m}represent m common transmitter channel, h _crrepresent calibration receiver channels, h _{rxcal, m}represent m receiver calibration channel, h _ctrepresent calibration transmitter channel, h _{br, m}represent m common receiver channels, h _{cal, ji}represent the calibration channel of j transmitter to a i receiver, h _{cr, j}represent j calibration receiver channels, h _{ct, i}represent i calibration transmitter channel, w _mrepresent m RRH internal calibration weight,

represent m RRH internal calibration weight, the substitution value of calibration weight between the RRH of i RRH internal calibration module, w _{c, i}the actual value of calibration weight between the RRH of i RRH internal calibration module, w _{c, 1}represent the calibration weight of himself, h _{cr, i}represent i calibration receiver channels, h _{cr, 1}represent the calibration receiver channels of calibration module between selected described RRH, h _{ct, 1}represent the calibration transmitter channel of calibration module between selected described RRH, h _{cal, 1i}represent the calibration channel of calibration module to a i receiver between selected described RRH, h _{cal, i1}represent the calibration channel of i transmitter to calibration module between selected described RRH.

Although the method described in Fig. 5 does not need calibration module between independent RRH, owing to having lacked calibration module between independent RRH, thereby make multiple RRH, be no longer like that symmetrical before, this can bring certain trouble to aspects such as compatibility and maintenances.

In sum, because the calibration of calibration module between RRH depends on wired network, and such network can avoid the interference of outside noise substantially, and between this RRH that must make to draw according to method of the present invention, the precision of the calibration weight of calibration module is very high.

By foundation method and apparatus of the present invention, can realize at hardware and slightly changing under the prerequisite that even work does not change, by the improvement of algorithm, overcome the defect of calibrating between traditional single RRH internal calibration and RRH, can calculate easily the relevant calibration weight such as calibration module calibration weight between RRH, and calibration module calibration weight between this RRH can be applied to the calibration of the transmit antenna array being formed by RRH, just can realize thus the object of the channel reciprocity between wireless network base station alignment RRH.

Those skilled in the art will be understood that each device alleged in the present invention both can be realized by hardware module, also can be by the Implement of Function Modules in software, can also be realized by the hardware module of integrated software function module.

Those skilled in the art will be understood that above-described embodiment is all exemplary and nonrestrictive.The different technologies feature occurring in different embodiment can combine, to obtain beneficial effect.Those skilled in the art, on the basis of research accompanying drawing, specification and claims, will be understood that and realize the embodiment of other variations of disclosed embodiment.In claims, term " comprises " does not get rid of other devices or step; Indefinite article " one " is not got rid of multiple; Term " first ", " second " are for indicating title but not for representing any specific order.Any Reference numeral in claim all should not be understood to the restriction to protection range.The function of the multiple parts that occur in claim can be realized by an independent hardware or software module.Some technical characterictic appears in different dependent claims and does not mean that and these technical characterictics can not be combined to obtain beneficial effect.

Claims (10)

1. a method for the channel reciprocity between wireless network base station alignment RRH, wherein, described RRH is connected to the each RRH of the comprising internal calibration module in calibration module between RRH and described RRH jointly, and described method comprises:

A. calibration module open calibration module between described RRH under joint transmission application scenarios between selected described RRH;

B. utilize calibration module between described RRH carry out sending and receiving calibration and calculate calibration weight by base band; And

C. described calibration weight is applied to the calibration of the transmit antenna array being formed by described RRH,

Wherein, described calibration weight comprises at least one in calibration module calibration weight between RRH and RRH internal calibration weight and comprehensive weight.

2. method according to claim 1, wherein, step b further comprises:

O. between described RRH, calibration module is set to sending mode, by the transmitter of the transceiver of calibration module between described RRH, to the receiver of the calibration transceiver of coupled described RRH inside, sends the first calibrating signal;

P. between described RRH, calibration module is set to receiving mode, by the transmitter of the calibration transceiver of described RRH inside, to the receiver of the transceiver of calibration module between described RRH, sends the 3rd calibrating signal;

Q. described base band calculates calibration module calibration weight between described RRH according to the channel response in step o and p.

3. method according to claim 2, wherein, if in described step a between selected described RRH calibration module be the independent calibration module being independent of outside described RRH, in described step o and p, obtain respectively: h _{c_rxcal, j}=h _ccth _{cr, j}, j=1,2 ... N and h _{c_txcal, j}=h _{ct, j}h _ccr, n=1,2 ... N, in step q according to formula:

calculate calibration module calibration weight between described RRH, wherein, h _{c_rxcal, j}represent receiver calibration channel between j RRH, h _ccirepresent the transmitter channel of calibrating transceiver between RRH, h _{cr, j}represent j calibration receiver channels, h _{c_txcal, j}represent transmitter calibration channel between j RRH, h _{ct, j}represent j calibration transmitter channel, h _ccrrepresent to calibrate between RRH the receiver channels of transceiver, w _{c, j}represent the actual value of calibration weight between the RRH of j RRH internal calibration module,

the substitution value of calibration weight between the RRH of j RRH internal calibration module, w _ccrepresent the weight of calibrating transceiver between RRH;

If between selected described RRH, calibration module is in the RRH internal calibration module in described RRH in described step a, in described step o and p, obtain: h _{cal, ji}=h _{cr, j}h _{ct, i}; I, j=1,2 ..N, i ≠ j, in step q according to formula:

calculate calibration module calibration weight between described RRH, wherein, h _{cal, ji}represent the calibration channel of j transmitter to a i receiver, h _{cr, j}represent j calibration receiver channels, h _{ct, i}represent i calibration transmitter channel,

the substitution value of calibration weight between the RRH of i RRH internal calibration module, w _{c, i}the actual value of calibration weight between the RRH of i RRH internal calibration module, w _{c, 1}represent the calibration weight of himself, h _{cr, j}represent i calibration receiver channels, h _{cr, 1}represent the calibration receiver channels of calibration module between selected described RRH, h _{ct, 1}represent the calibration transmitter channel of calibration module between selected described RRH, h _{cal, 1i}represent the calibration channel of calibration module to a i receiver between selected described RRH, h _{cal, i1}represent the calibration channel of i transmitter to calibration module between selected described RRH.

4. method according to claim 2, wherein, described step o further comprises:

While sends the second calibrating signal by the transmitter of the normal transceiver of described RRH inside to the receiver of the calibration transceiver of described RRH inside, and wherein, described the second calibrating signal and described the first calibrating signal are mutually orthogonal;

And described step p further comprises:

By with described RRH between the transmitter of calibration transceiver of the described RRH inside that is connected of calibration module to the receiver of calibration module between described RRH, send the 4th calibrating signal simultaneously, wherein, described the 4th calibrating signal and described the 3rd calibrating signal are mutually orthogonal;

And further comprise at described step q:

Described base band calculates calibration module calibration weight and comprehensive weight between RRH internal calibration weight, RRH according to the channel response in step o and p.

5. method according to claim 4, wherein, if in described step a between selected described RRH calibration module be the independent calibration module being independent of outside described RRH, by described step o and p, obtained respectively: h _{txcal, m}=h _{bt, m}h _cr, m=1,2 ... M, h _{c_rxcal, j}=h _ccrh _{cr, j}, j=1,2 ... N and h _{rxcal, m}=h _crh _{br, m}, i=1,2 ... M, h _{c_rxcal, j}=h _{ct, j}h _ccr, n=1,2 ... N, and in step q respectively according to below formula calculate calibration module calibration weight and described comprehensive weight between described RRH internal calibration weight, described RRH: $w_m\≡\frac{h_{\mathrm{bt},m}}{h_{\mathrm{br},m}}==\frac{h_{\mathrm{txcal},m}}{h_{\mathrm{rxcal},m}}\frac{h_{\mathrm{ct}}}{h_{\mathrm{cr}}}={\tilde{w}}_m{w}_c,$ $w_{c,j}\≡\frac{h_{\mathrm{ct},j}}{h_{\mathrm{cr},j}}=\frac{h_{c\_\mathrm{txcal},j}}{h_{c\_\mathrm{rxcal},j}}\frac{h_{\mathrm{cct}}}{h_{\mathrm{ccr}}}={\tilde{w}}_{c,j}{w}_{\mathrm{cc}}$ With

m=1,2 ..., M; J=1,2 ..., N, wherein, h _{txcal, m}represent m transmitter calibration channel, h _{bt, m}represent m common transmitter channel, h _crrepresent calibration receiver channels, h _{c_rxcal, j}represent receiver calibration channel between j RRH, h _ccirepresent the transmitter channel of calibrating transceiver between RRH, h _{cr, j}represent j calibration receiver channels, h _{rxcal, m}represent m receiver calibration channel, h _ctrepresent calibration transmitter channel, h _{br, m}represent m common receiver channels, h _{c_txcal, j}represent transmitter calibration channel between j RRH, h _{ct, j}represent j calibration transmitter channel, h _ccrrepresent to calibrate between RRH the receiver channels of transceiver, w _mrepresent m RRH internal calibration weight, represent m RRH internal calibration weight, w _{c, j}represent the actual value of calibration weight between the RRH of j RRH internal calibration module, the substitution value of calibration weight between the RRH of j RRH internal calibration module, w _ccrepresent the weight of calibrating transceiver between RRH;

If between selected described RRH, calibration module is in the RRH internal calibration module in described RRH in described step a, by described step o and p, obtained respectively: h _{txcal, m}=h _{bt, m}h _cr, wherein, m=1,2 ... M, h _{rxcal, m}=h _cth _{br, m}, wherein, m=1,2 ... M and h _{cal, ji}=h _{cr, j}h _{ct, i}; I, j=1,2 ... N, i ≠ j, and in step q respectively according to below formula calculate calibration module calibration weight and described comprehensive weight between described RRH internal calibration weight, described RRH: $w_m\≡\frac{h_{\mathrm{bt},m}}{h_{\mathrm{br},m}}=\frac{h_{\mathrm{txcal},m}}{h_{\mathrm{rxcal},m}}\frac{h_{\mathrm{ct}}}{h_{\mathrm{cr}}}={\tilde{w}}_m{w}_c,$ Wherein, $w_c=\frac{h_{\mathrm{ct}}}{h_{\mathrm{cr}}},{\tilde{w}}_m=\frac{h_{\mathrm{txccal},m}}{h_{\mathrm{cxcal},m}},$ ${\tilde{w}}_{c,i}=\frac{w_{c,i}}{w_{c,1}}=\frac{h_{\mathrm{ct},i}}{h_{\mathrm{cr},i}}\frac{h_{\mathrm{cr},1}}{h_{\mathrm{ct},1}}=\frac{h_{\mathrm{cal},1i}}{h_{\mathrm{cal},i1}}$ With $w_{m,i}={\tilde{w}}_{m,i}{w}_{c,i}={\tilde{w}}_{m,i}{\tilde{w}}_{c,i}{w}_{c,1},$ Wherein, h _{txcal, m}represent m transmitter calibration channel, h _{bt, m}represent m common transmitter channel, h _crrepresent calibration receiver channels, h _{rxcal, m}represent m receiver calibration channel, h _ctrepresent calibration transmitter channel, h _{br, m}represent m common receiver channels, h _{cal, ji table}show the calibration channel of j transmitter to a i receiver, h _{cr, j}represent j calibration receiver channels, h _{ct, i}represent i calibration transmitter channel, w _mrepresent m RRH internal calibration weight, represent m RRH internal calibration weight,

the substitution value of calibration weight between the RRH of i RRH internal calibration module, w _{c, i}the actual value of calibration weight between the RRH of i RRH internal calibration module, w _{c, 1}represent the calibration weight of himself, h _{cr, i}represent i calibration receiver channels, h _{cr, 1}represent the calibration receiver channels of calibration module between selected described RRH, h _{ct, 1}represent the calibration transmitter channel of calibration module between selected described RRH, h _{cal, 1i}represent the calibration channel of calibration module to a i receiver between selected described RRH, h _{cal, i1}represent the calibration channel of i transmitter to calibration module between selected described RRH.

6. according to the method described in any one in claim 1 to 5, wherein, between described RRH, calibration module comprises a port with the quantity corresponding with the quantity of connected described RRH and close device.

7. a device for the channel reciprocity between wireless network base station alignment RRH, described device comprises:

At least two RRH modules, wherein, the each RRH internal calibration module that comprises in described at least two RRH modules; And

Calibration module between RRH, it is connected with described at least two RRH modules, between described RRH, calibration module is in the RRH internal calibration module in independent calibration module or the described RRH being independent of outside described RRH, wherein, under joint transmission application scenarios, open calibration module between described RRH, carry out sending and receiving calibration and calculated calibration weight and described calibration weight is applied to the calibration of transmitted signal by base band, described calibration weight comprises at least one in calibration module calibration weight between RRH and RRH internal calibration weight and comprehensive weight.

8. device according to claim 7, wherein, between described RRH, calibration module comprises a port with the quantity corresponding with the quantity of connected described RRH and close device.

9. device according to claim 7, wherein, between described RRH, in calibration module, carry out following steps:

O. between described RRH, calibration module is set to sending mode, by the transmitter of the transceiver of calibration module between described RRH, to the receiver of the calibration transceiver of coupled described RRH inside, sends the first calibrating signal;

P. between described RRH, calibration module is set to receiving mode, by the transmitter of the calibration transceiver of described RRH inside, to the receiver of the transceiver of calibration module between described RRH, sends the 3rd calibrating signal;

Q. described base band calculates calibration module calibration weight between described RRH according to the channel response in step o and p.

10. device according to claim 9, wherein, between described RRH, in calibration module, further carry out following steps:

O '. the while sends the second calibrating signal by the transmitter of the normal transceiver of described RRH inside to the receiver of the calibration transceiver of described RRH inside, and wherein, described the second calibrating signal and described the first calibrating signal are mutually orthogonal;

P '. by with described RRH between the transmitter of calibration transceiver of the described RRH inside that is connected of calibration module to the receiver of calibration module between described RRH, send the 4th calibrating signal simultaneously, wherein, described the 4th calibrating signal and described the 3rd calibrating signal are mutually orthogonal;

Q '. described base band calculates calibration module calibration weight and comprehensive weight between RRH internal calibration weight, RRH according to the channel response in step o ' and p '.

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