CN1909692A - Wireless base station and method for controlling gain of receiving channel - Google Patents
Wireless base station and method for controlling gain of receiving channel Download PDFInfo
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- CN1909692A CN1909692A CNA2006101095432A CN200610109543A CN1909692A CN 1909692 A CN1909692 A CN 1909692A CN A2006101095432 A CNA2006101095432 A CN A2006101095432A CN 200610109543 A CN200610109543 A CN 200610109543A CN 1909692 A CN1909692 A CN 1909692A
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Abstract
The invention relates to a wireless base station and a method for controlling the increment of receiving channel, wherein said wireless base station comprises base band, automatic increment control module, signal coupler, signal diverter and N radio forward modules; said radio forward module has duplexer and the receiver and sender connected to the duplexer; said base band comprises connected base band demodulator and base band modulator; N receivers are connected to the signal coupler; said signal coupler, automatic increment control module and the base band modulator are connected; the signal diverter is connected to N senders and base band modulator. The inventive method comprises: coupling the ascending signals of each radio forward module to adjust the automatic increment. The invention can confirm the best service capacity of multi-radio forward shared region.
Description
Technical field
The present invention relates to wireless communication field, especially many radio-frequency front-ends guarantee RF front-end module, the Base Band Unit of cell capacity maximum and the wireless base station that is made of this RF front-end module or Base Band Unit under the condition of sub-district altogether, and the method for the gain of this wireless base-station control receive path.
Background technology
In wireless communication system, the wireless base station is made of Base Band Unit and RF front-end module two parts.Wherein, Base Band Unit sends to RF front-end module after being used for downstream signal (that is: the wireless base station sends to the signal of portable terminal) modulated, simultaneously, upward signal (that is: portable terminal sends to the signal of wireless base station) is carried out sending to radio network controller after the demodulation.Be provided with transmitter and receiver in the RF front-end module, respectively emission and the signal that receives carried out radio frequency processing.(that is: non-regular hexagon zone) carries out wireless signal when covering in specification region not when the wireless base station, for example: to the indoor wireless signal that carries out when covering, may need to adopt many RF front-end modules to cover, different RF front-end modules covers different zones.The schematic diagram of wireless base station and RF front-end module overlay area thereof is referring to Fig. 1, and circle among Fig. 1 or elliptical region are the overlay area of respective radio-frequency front-end module, and wherein, the overlay area of each RF front-end module belongs to same sub-district.Among Fig. 1, the upward signal that signal combiner in the Base Band Unit receives each RF front-end module is transmitted to base band demodulator after closing the road, simultaneously, the signal shunt in the Base Band Unit sends to each RF front-end module to be transferred to portable terminal simultaneously with the modulation signal that baseband modulator sends.
In the practical application, because of the variation of number of users variation and wireless propagation environment, total power that receiver sends to Base Band Unit is unsteady bigger, has influenced the demodulation performance of base band demodulator to upward signal.In the prior art, in order to adapt to the big dynamic change scope of upward signal, in the receiver of RF front-end module, be provided with AGC (Auto Gain Control, automatic gain control) module, the overall strength that is used for upward signal that this receiver the is received adjustment that gains automatically makes to maintain a steady state value from the signal strength signal intensity of receiver output.Figure 2 shows that the structural representation of prior art wireless base station.
Cell capacity is meant under given conditions, a sub-district the maximum number of user that can hold.The size of cell capacity depends on the minimum value SNR of ratio SNR (Signal to Noise Ratio, signal to noise ratio) of the power of signal that the base band demodulator in the Base Band Unit can be accepted and noise
MinIn WCDMA (Wideband CDMA, Wideband Code Division Multiple Access (WCDMA)) system, the signal that all users send all is superimposed and sends to the receiver of wireless base station, and for one of them user, the signal that other users send all is an interference noise.Suppose that under power control the n of a sub-district user arrives that the signal power of base band demodulator all equates in the wireless base station, then each user's signal to noise ratio all is: SNR=1/ (n-1).Work as SNR=SNR
MinThe time, the value maximum of n, the number of users that this moment, the sub-district held is: n=1+1/SNR
Min, be cell capacity.If it is unequal that each user arrives in the wireless base station signal power of base band demodulator, then that user's of signal power minimum signal to noise ratio snr＜1/ (n-1), that is: n＜1+1/SNR
Min, at this moment, cell capacity is reduced.Therefore, when the power that has only each user to arrive the signal of base band demodulator equated, it is maximum that cell capacity just can reach.Therefore for the such self-interference system of cdma system (comprising WCDMA, CDMA2000, IS95 etc.), must adjust the transmitting power of portable terminal by closed power control in real time, make the intensity of signal base band demodulator input in the wireless base station that all portable terminals are launched equate, just can reach the best cell capacity.
Referring to Fig. 2, in the prior art, the AGC module is arranged in the receiver of each RF front-end module, each AGC module works alone, and the intensity of its output signal (signal and the noise that comprise all the user's emissions of this RF front-end module) is constant, each AGC module is carried out the automatic gain adjustment independently according to the signal strength signal intensity of receiving separately respectively, makes that the signal strength signal intensity of AGC module output is a steady state value.Therefore, as long as there is a number of users different in the wireless base station with other RF front-end module access, just the signal strength signal intensity with other user is different for each user's signal strength signal intensity in this RF front-end module output signal, thereby the signal that just can't satisfy all users is in the equal condition of the intensity of base band demodulator input, and cell capacity also just can't reach maximum.For example: the steady state value of the signal strength signal intensity of each AGC output is S in the assumed wireless base station, RF front-end module A receives the upward signal that x user sends, RF front-end module B receives the upward signal that y user sends, then after the AGC of each RF front-end module adjusts, each user's signal strength signal intensity is S/x in the signal of RF front-end module A output, and each user's signal strength signal intensity is S/y in the RF front-end module B output signal, when x is not equal to y, the signal strength signal intensity of user by RF front-end module A and RF front-end module B output is just different at the input of base band demodulator, thereby causes the decline of cell capacity.Suppose the number of users y of the number of users x of RF front-end module A access greater than RF front-end module B access, then the signal strength signal intensity of the user in the signal of the output of the AGC module among the RF front-end module A is on the low side.And, because when the wireless base station improves the user's that RF front-end module A receives signal power by the closed power controlling mechanism, the AGC module reduces gain automatically, thereby make the signal strength signal intensity of this user in the AGC module output signal constant, offset the effect of closed power control, therefore, even also can't make all user power on RF front-end module A and the B all equate, thereby cause the decline of cell capacity by the closed power controlling mechanism.
Summary of the invention
Technical problem to be solved by this invention is, in many radio-frequency front-ends cdma wireless base station at prior art, each AGC module is independently carried out automatic gain and is controlled the defective that caused cell capacity descends, the wireless base station that RF front-end module, Base Band Unit is provided and constitutes by this RF front-end module or Base Band Unit, and the method that reaches the gain of control receive path, to guarantee cell capacity the best.
For solving the problems of the technologies described above, a kind of method of controlling the gain of receive path provided by the invention, it may further comprise the steps:
In the said method, described step 1 is specially: the receiver in each RF front-end module sends to signal combiner with the upward signal that receives, and this signal combiner sends to the automatic gain control module after the upward signal that receives is closed the road.
Described step 1 is specially: signal combiner will be closed the road by the upward signal that signal combiner that connects or the receiver in the RF front-end module send, and the upward signal that will close behind the road sends to signal combiner or the automatic gain control module that connects according to the uplink direction.Described step 1 is specially: send to N-2 signal combiner after N-1 signal combiner closed the road with the individual upward signal that reaches the receiver reception in this N-1 RF front-end module of RF front-end module of N, wherein N is the integer greater than 1; N-1 sends to the 1st signal combiner with N-1 of correspondence receiver and the upward signal that send of the previous signal combiner that is connected to the 2nd RF front-end module after closing the road successively to the 2nd signal combiner; After closing the road, the 1st upward signal that signal combiner receives N RF front-end module send to the automatic gain control module.
A kind of RF front-end module provided by the invention comprises duplexer and the receiver and the transmitter that are connected with this duplexer respectively, it is characterized in that, also comprises: signal combiner, be connected with described receiver, and be used for the upward signal that receives is closed the road.
In the above-mentioned RF front-end module, also comprise: the automatic gain control module, be connected with described signal combiner, be used for the upward signal that this signal combiner sends is carried out the automatic gain adjustment.In addition, RF front-end module can also comprise: signal shunt, be connected with described transmitter, and be used for the signal shunt that sends to described transmitter and connect after the downstream signal shunt that receives according to described downstream signal transmission direction.
A kind of Base Band Unit provided by the invention comprises base band demodulator and baseband modulator, also comprises: the automatic gain control module, be connected with described base band demodulator, and the upward signal that is used to receive carries out the automatic gain adjustment.
In the above-mentioned Base Band Unit, also comprise: signal combiner, be connected with described automatic gain control module, be used for the upward signal that receives is closed the road.In addition, Base Band Unit can also comprise: signal shunt, be connected with described transmitter, and be used for the signal shunt that sends to described transmitter and connect after the downstream signal shunt that receives according to described downstream signal transmission direction.
A kind of wireless base station provided by the invention, comprise Base Band Unit, automatic gain control module, the 1st signal combiner, the 1st signal shunt and N RF front-end module, receiver and transmitter that described RF front-end module is provided with duplexer and is connected with this duplexer respectively; Described Base Band Unit comprises base band demodulator and baseband modulator, N described receiver is connected with described signal combiner respectively, this signal combiner, described automatic gain control module and described base band demodulator connect successively, and described signal shunt is connected with N described transmitter and described baseband modulator respectively; Wherein, N is the integer greater than 1.
In the above-mentioned wireless base station, described automatic gain control module is digital Auto Gain control module or simulation automatic gain control module.
Described automatic gain control module, described the 1st signal combiner and described the 1st signal shunt and described Base Band Unit are wholely set.
Above-mentioned wireless base station also comprises K signal combiner, and the 2nd one or more to N the receiver are connected with described the 1st signal combiner by K signal combiner respectively; Wherein, K is the integer in 2 to N-1.
In addition, the wireless base station also comprises K signal shunt, and the 2nd one or more to N the transmitter are connected with described the 1st signal shunt by K signal shunt respectively.Wherein, K signal combiner, a K signal shunt are wholely set with K RF front-end module respectively, and described automatic gain control module, described the 1st signal combiner and described the 1st signal shunt and the 1st RF front-end module are wholely set.In this wireless base station, the receiver in N RF front-end module is connected with N-1 signal combiner, and the transmitter in N RF front-end module is connected with N-1 signal shunt; Signal combiner in the 2nd to N-1 RF front-end module is connected with previous signal combiner respectively, and the signal shunt in the 2nd to N-1 RF front-end module is connected with previous signal shunt respectively.
Based on technique scheme, the present invention has following beneficial technical effects:
The automatic gain control module is arranged on after the signal combiner, the upward signal that all RF front-end modules are received closes Lu Houzai and carries out automatic gain control, after adjusting to equal value, the power that can be earlier each portable terminal be sent to the upward signal of RF front-end module by close-loop power controlling method closes the road again, because the gain of upward signal before closing the road that all radio-frequency front-ends send all fixed, intensity when making all portable terminals send in the sub-district upward signal reach base band demodulator is identical, thereby make its signal to noise ratio equate, guaranteed Zone capacity the best.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is the schematic diagram of wireless base station and RF front-end module overlay area thereof.
Fig. 2 is the structural representation of prior art wireless base station.
Fig. 3 controls the basic flow sheet of method of the gain of receive path for the present invention.
Fig. 4 is the structural representation of RF front-end module embodiment one of the present invention.
Fig. 5 is the structural representation of RF front-end module embodiment two of the present invention.
Fig. 6 is the structural representation of RF front-end module embodiment three of the present invention.
Fig. 7 is the structural representation of Base Band Unit embodiment one of the present invention.
Fig. 8 is the structural representation of Base Band Unit embodiment two of the present invention.
Fig. 9 is the structural representation of Base Band Unit embodiment three of the present invention.
Figure 10 is the basic structure schematic diagram of the wireless base station of realization method of the present invention.
Figure 11 is the structural representation of wireless base station embodiment one of the present invention.
Figure 12 is the flow chart of the gain of wireless base-station control receive path shown in Figure 11.
Figure 13 is the structural representation of wireless base station embodiment two of the present invention.
Figure 14 is the flow chart of method of the gain of wireless base-station control receive path shown in Figure 13.
Figure 15 is the structural representation of wireless base station embodiment three of the present invention.
Embodiment
The present invention a kind ofly solves each AGC module in the prior art and independently carries out the method for the problem that the caused cell capacity of AGC module descends and the wireless base station of realizing this method, its core concept is: after the AGC module is arranged on the signal combiner that the upward signal that all radio-frequency front-ends in the wireless base station are received closes the road, the upward signal that all radio-frequency front-ends are received closes the road earlier, and then carry out the automatic gain adjustment, be applicable to that many radio-frequency front-ends are total to the code division multiple access system under the condition of sub-district.
Figure 3 shows that the present invention controls the basic flow sheet of method of the gain of receive path, it may further comprise the steps:
Step 301, signal combiner is closed the road to the upward signal that each RF front-end module sends;
Step 302, the upward signal behind the involutory road of AGC module carries out the automatic gain adjustment, and the power of this upward signal is adjusted to predefined calibration power value.
Can pass through close-loop power controlling method earlier, make and to equate from the power of the upward signal of each RF front-end module output, thereby the signal to noise ratio of the signal that feasible each portable terminal that reaches the AGC module sends equates, and then make the quantity maximum of the portable terminal of this sub-district of living in, wireless base station, cell capacity the best.
Figure 4 shows that the structural representation of RF front-end module embodiment one of the present invention, this RF front-end module comprises duplexer Y11 and the receiver Y12 and the transmitter Y13 that are connected with this duplexer Y11 respectively, also comprises the signal combiner Y14 that is connected with receiver Y12 in addition.Can close the road to the upward signal that all RF front-end modules that are in the same wireless base station receive by signal combiner Y14, and then sending to an AGC module, the signal to noise ratio of the signal that feasible each portable terminal that reaches the AGC module sends equates.
In addition, RF front-end module shown in Figure 4 can be wholely set with the AGC module, that is: the AGC module Y16 that will be connected with signal combiner Y14 is arranged in the RF front-end module, and the structural representation of the RF front-end module embodiment two of Gou Chenging as shown in Figure 5 thus.
Equally, Fig. 4 or RF front-end module shown in Figure 5 also can be connected signal shunt is wholely set, the structural representation that signal shunt Y15 is arranged at the RF front-end module embodiment three that constitutes in the RF front-end module shown in Figure 5 is as shown in Figure 6.
Figure 7 shows that the structural representation of Base Band Unit embodiment one of the present invention, comprise AGC module 22, base band demodulator 23 and baseband modulator 24, wherein AGC module 22 is connected with base band demodulator 23.Send to this AGC module 22 after can closing the road by the upward signal that a signal combiner sends in the wireless base station of living in RF front-end module, the signal to noise ratio of the signal that feasible each portable terminal that reaches the AGC module sends equates.
In addition, signal combiner 21 23 that be connected with base band demodulator, that be used for the upward signal that all RF front-end modules of same wireless base station send is closed the road can be arranged in the Base Band Unit shown in Figure 7, the structural representation of the Base Band Unit embodiment two of Gou Chenging is referring to Fig. 8 thus.
Equally, also can signal shunt 25 be arranged at the structural representation of the Base Band Unit embodiment three that constitutes in the Base Band Unit shown in Figure 8 referring to Fig. 9 with being arranged at Fig. 7 or Base Band Unit shown in Figure 8 with baseband modulator 24 downstream signal signal shunts 25 along separate routes that be connected, that be used for baseband modulator 24 is sent.
Figure 10 shows that the basic structure schematic diagram of the wireless base station of realizing method shown in Figure 3, this wireless base station comprises Base Band Unit, AGC module, the 1st signal combiner, the 1st signal shunt and N RF front-end module, receiver and transmitter that RF front-end module is provided with duplexer and is connected with this duplexer respectively; Wherein, Base Band Unit comprises base band demodulator and baseband modulator, and N receiver is connected with signal combiner respectively, and this signal combiner, AGC module and base band demodulator connect successively, and signal shunt is connected with N transmitter and baseband modulator respectively.Wherein, N is the integer greater than 1.Wherein, the upward signal that each duplexer is used to receive each portable terminal transmission in the zone of administering this wireless base station is transmitted to the receiver of connection, and simultaneously, the downstream signal that the transmitter that connects is sent sends to portable terminal; The upward signal that the duplexer that receiver is used for connecting sends is transmitted to signal combiner, and transmitter is used for the downstream signal that signal shunt sends is sent to the duplexer of connection; Signal combiner sends to the AGC module after being used for the upward signal that each receiver sends closed the road; The AGC module is used for the upward signal that receives is carried out the automatic gain adjustment, sends to base band demodulator after its power is adjusted to a predefined calibration power value; Base band demodulator is used for sending to radio network controller behind the upward signal rectification; Send to signal shunt after the downstream signal modulation that baseband modulator is used for radio network controller is sent; Send to each transmitter simultaneously after the downstream signal shunt that signal shunt is used for baseband modulator is sent.
In the wireless base station shown in Figure 10, signal combiner, AGC module and signal shunt can be wholely set with RF front-end module or Base Band Unit, that is: both can be arranged in the RF front-end module, also can be arranged in the Base Band Unit.
Figure 11 shows that the structural representation of wireless base station embodiment one of the present invention.In this wireless base station, signal combiner, AGC module and signal shunt are arranged in the Base Band Unit 2, and at this moment, the Base Band Unit of employing is Base Band Unit shown in Figure 9.Among this embodiment, the Base Band Unit 2 and the first RF front-end module X1, the second RF front-end module X2 ..., N RF front-end module XN (N is the integer greater than 1) connects with star-like networking mode.Each RF front-end module X1, X2 ..., structure and the function of XN be all identical, the first RF front-end module X1 comprises duplexer X11 and the receiver X12 and the transmitter X13 that are connected with this duplexer X11, equally, the second RF front-end module X2 comprises duplexer X21 and the receiver X22 and the transmitter X23 that are connected with this duplexer X21, ..., N RF front-end module XN comprises duplexer XN1 and the receiver XN2 and the transmitter XN3 that are connected with this duplexer XN1; Base Band Unit 2 comprises signal combiner 21, the AGC module 22 and base band demodulator 23 that connects successively, and interconnective baseband modulator 24 and signal shunt 25, AGC module 22 can be AAGC module or DAGC module, signal combiner 21 also with receiver X12, X22 ..., XN2 connects, signal shunt 25 also with transmitter X13, X23 ..., XN3 connects.Wherein, each duplexer X11, X21 ..., the XN1 upward signal that is used to receive each portable terminal transmission in the zone of administering this wireless base station be transmitted to respective receiver X12, X22 ..., XN2, simultaneously, with transmitter X13, X23 ..., the downstream signal that sends of XN3 sends to portable terminal; Receiver X12, X22 ..., XN2 be used for duplexer X11, X21 ..., the upward signal that sends of XN1 is transmitted to signal combiner 21, transmitter X13, X23 ..., XN3 be used for the downstream signal that signal shunt 25 sends send to corresponding duplexer X11, X21 ..., XN1; Signal combiner 21 be used for to receiver X12, X22 ..., the upward signal that sends of XN2 sends to AGC module 22 after closing the road; AGC module by signal splitter 25 be used for downstream signal that baseband modulator 24 is sent send to simultaneously after along separate routes transmitter X13, X23 ..., XN3.
Figure 12 is the flow chart of the gain of wireless base-station control receive path shown in Figure 11, and it specifically may further comprise the steps:
Step 1201, each duplexer X11, X21 ..., XN1 by respective receiver X12, X22 ..., XN2 sends to signal combiner 21 with upward signal;
Step 1202, signal combiner 21 send to AGC module 22 after the upward signal that receives is closed the road;
In the embodiment shown in fig. 12, can pass through close-loop power controlling method earlier, make from each receiver X12, X22 ..., the power of the upward signal that sends of each portable terminal of XN2 output equates, thereby the signal to noise ratio of the signal that feasible each portable terminal that reaches the AGC module sends equates, and then make the quantity maximum of the portable terminal of this sub-district of living in, wireless base station, cell capacity the best.
Figure 13 shows that the structural representation of wireless base station embodiment two of the present invention.The Base Band Unit 3 in this wireless base station and the first RF front-end module Y1, the second RF front-end module Y2 ..., N-1 RF front-end module Y (N-1), N RF front-end module YN (N for greater than 1 integer) connect in the chain networking mode.N RF front-end module YN comprises duplexer YN1 and the receiver YN2 and the transmitter YN3 that are connected with this duplexer YN1, the the 1st to N-1 RF front-end module removes and is respectively equipped with duplexer Y11 in RF front-end module separately, Y21, ..., Y (N-1) 1 and respectively with duplexer Y11, Y21, ..., the receiver Y12 that Y (N-1) 1 connects, Y22, ..., Y (N-1) 2 and transmitter Y13, Y23, ..., outside the Y (N-1) 3, also be respectively equipped with and receiver Y12, Y22, ..., the signal combiner Y14 that Y (N-1) 2 connects, Y24, ..., Y (N-1) 4, and with transmitter Y13, Y23, ..., the signal shunt Y15 that Y (N-1) 3 connects, Y25, ..., Y (N-1) 5; In addition, receiver Y12 among the first RF front-end module Y1 also connects an AGC module Y16, this AGC module Y16 can be AAGC module or DAGC module, be connected with the base band demodulator 31 in the Base Band Unit 3, this base band demodulator 31 is used for sending to radio network controller behind the upward signal rectification that receives; Also be provided with the baseband modulator 32 that is connected with signal shunt Y15 in this Base Band Unit 3, send to signal shunt Y15 after the downstream signal modulation that is used for radio network controller is sent; Receiver YN2 is connected with signal combiner Y (N-1) 4, the upward signal that is used for receiving sends to signal combiner Y (N-1) 4, signal combiner Y (N-1) 4, ..., Y24, Y14 connects successively, be respectively applied for receiver in the same RF front-end module that will connect and the signal combiner in the next RF front-end module and (be not provided with signal combiner in the N RF front-end module, signal combiner Y (N-1) the 4th, the upward signal that receiver YN2 and receiver Y (N-1) 2 are received closes the road) signal that sends closes the signal combiner that sends to behind the road in the last RF front-end module, send to AGC module Y16 after finally closing the road by the signal combiner Y14 among the first RF front-end module Y1, Y16 carries out the automatic gain adjustment to its power by the AGC module, sends to base band demodulator 31 after it is adjusted to a predefined calibration power value; Signal shunt Y15, Y25 ..., Y (N-1) 5 and transmitter YN3 connect successively, be used for downstream signal that baseband modulator 32 is sent send to after along separate routes successively transmitter Y13, Y23 ..., YN3 to be to send.
After removing the AGC module in the radio-frequency front-end, earlier all upward signals are closed Lu Houzai and send to the AGC module and carry out the automatic gain adjustment, avoided independently the signal strength signal intensity of receiving separately being carried out the decline of the cell capacity that the automatic gain adjustment brought because of each AGC module by the signal combiner in the Base Band Unit.
AGC modules A GC module
Figure 14 shows that the flow chart of method of the gain of Figure 13 wireless base-station control receive path,, it specifically may further comprise the steps:
Step 1401, duplexer Y11, Y21 ..., YN1 by respective receiver Y12, Y22 ..., YN2 with upward signal send to corresponding signal combiner Y14, the Y24 that is connected with each receiver ..., Y (N-1) 4;
Step 1402, each signal combiner Y24 ..., Y (N-1) 4 sends to previous signal combiner after respectively the signal that receives being closed the road, finally sends to AGC module Y16 after by the signal combiner Y14 among the first RF front-end module Y1 all upward signals being closed the road;
Step 1403, AGC module Y16 carries out the automatic gain adjustment to the upward signal that receives, and the power of this upward signal is adjusted to the base band demodulator 31 that sends to after the predefined calibration power value in the Base Band Unit 3.
Between RF front-end module and the Base Band Unit except star-like as Figure 11 and employing shown in Figure 13, beyond the chain networking mode connects, can also adopt and star-likely be connected with the chain hybrid mode, the structural representation of the wireless base station embodiment three of Gou Chenging can be referring to Figure 15 thus, that is: K signal combiner can be set before the AGC module in the wireless base station shown in Figure 11, and/or K signal shunt, this K signal combiner can adopt star-like with K signal shunt and/or the chain networking mode is connected N RF front-end module with Base Band Unit, sends to the AGC module after the upward signal that all RF front-end modules send in the wireless base station closes the road the most at last.In this wireless base station, the method of the gain of control receive path is identical with the principle of Figure 12 and Figure 14, signal combiner will be closed the road by the upward signal that signal combiner that connects or the receiver in the RF front-end module send, and the upward signal that will close behind the road sends to signal combiner or the AGC module that connects according to the uplink signal transmissions direction.
Total beneficial effect:
The automatic gain control module is arranged on after the signal combiner, the upward signal that all RF front-end modules are received closes Lu Houzai and carries out automatic gain control, close the road again after earlier the power that each portable terminal is sent to the upward signal of RF front-end module by close-loop power controlling method is adjusted to equal value, because the gain of the receive path of all radio-frequency front-ends before closing the road is all fixed, thereby the intensity when making all portable terminals send in the sub-district upward signal reach base band demodulator is identical, and then make its signal to noise ratio equate, guaranteed Zone capacity the best.
It should be noted last that: above embodiment is only in order to illustrating technical scheme of the present invention, but not the present invention is made restrictive sense.Although the present invention is had been described in detail with reference to above-mentioned preferred embodiment, those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement technical scheme of the present invention, and this modification or be equal to the spirit and scope that replacement does not break away from technical solution of the present invention.
Claims (17)
1, a kind of method of controlling the gain of receive path wherein, may further comprise the steps:
Step 1, the upward signal that each RF front-end module is sent closes the road;
Step 2, the upward signal behind the involutory road carries out the automatic gain adjustment.
2, method according to claim 1, wherein, described step 1 is specially:
Receiver in each RF front-end module sends to signal combiner with the upward signal that receives, and this signal combiner sends to the automatic gain control module after the upward signal that receives is closed the road.
3, method according to claim 1, wherein, described step 1 is specially:
Signal combiner will be closed the road by the upward signal that signal combiner that connects or the receiver in the RF front-end module send, and the upward signal that will close behind the road sends to signal combiner or the automatic gain control module that connects according to the uplink direction.
4, method according to claim 3, wherein, described step 1 is specially:
Send to N-2 signal combiner after N-1 signal combiner closed the road with the individual upward signal that reaches the receiver reception in this N-1 RF front-end module of RF front-end module of N, wherein N is the integer greater than 1;
N-1 sends to the 1st signal combiner with N-1 of correspondence receiver and the upward signal that send of the previous signal combiner that is connected to the 2nd RF front-end module after closing the road successively to the 2nd signal combiner;
After closing the road, the 1st upward signal that signal combiner receives N RF front-end module send to the automatic gain control module.
5, a kind of RF front-end module comprises duplexer and the receiver and the transmitter that are connected with this duplexer respectively, it is characterized in that, also comprises:
Signal combiner is connected with described receiver, is used for the upward signal that receives is closed the road.
6, RF front-end module according to claim 5 is characterized in that, also comprises:
The automatic gain control module is connected with described signal combiner, is used for the upward signal that described signal combiner sends is carried out the automatic gain adjustment.
7, according to claim 5 or 6 described RF front-end modules, it is characterized in that, also comprise:
Signal shunt is connected with described transmitter, is used for the signal shunt that sends to described transmitter and connect according to described downstream signal transmission direction after the downstream signal shunt that receives.
8, a kind of Base Band Unit comprises base band demodulator and baseband modulator, it is characterized in that, also comprises:
The automatic gain control module is connected with described base band demodulator, and the upward signal that is used to receive carries out the automatic gain adjustment.
9, Base Band Unit according to claim 8 is characterized in that, also comprises:
Signal combiner is connected with described automatic gain control module, is used for the upward signal that receives is closed the road.
10, according to Claim 8 or 9 described Base Band Unit, it is characterized in that, also comprise:
Signal shunt is connected with described transmitter, is used for the signal shunt that sends to described transmitter and connect according to described downstream signal transmission direction after the downstream signal shunt that receives.
11, a kind of wireless base station of realizing any described method of claim 1 to 4, comprise Base Band Unit, automatic gain control module, the 1st signal combiner, the 1st signal shunt and N RF front-end module, receiver and transmitter that described RF front-end module is provided with duplexer and is connected with this duplexer respectively; Described Base Band Unit comprises base band demodulator and baseband modulator, it is characterized in that, N described receiver is connected with described signal combiner respectively, this signal combiner, described automatic gain control module and described base band demodulator connect successively, and described signal shunt is connected with N described transmitter and described baseband modulator respectively; Wherein, N is the integer greater than 1.
12, wireless base station according to claim 11 is characterized in that, described automatic gain control module is digital Auto Gain control module or simulation automatic gain control module.
According to claim 11 or 12 described wireless base stations, it is characterized in that 13, described automatic gain control module, described the 1st signal combiner and described the 1st signal shunt and described Base Band Unit are wholely set.
14, according to claim 11 or 12 described wireless base stations, it is characterized in that, also comprise K signal combiner, the 2nd one or more to N the receiver are connected with described the 1st signal combiner by K signal combiner respectively; Wherein, K is the integer in 2 to N-1.
15, wireless base station according to claim 14 is characterized in that, also comprises K signal shunt, and the 2nd one or more to N the transmitter are connected with described the 1st signal shunt by K signal shunt respectively.
16, wireless base station according to claim 15, it is characterized in that, K signal combiner, a K signal shunt are wholely set with K RF front-end module respectively, and described automatic gain control module, described the 1st signal combiner and described the 1st signal shunt and the 1st RF front-end module are wholely set.
17, wireless base station according to claim 16 is characterized in that, the receiver in N RF front-end module is connected with N-1 signal combiner, and the transmitter in N RF front-end module is connected with N-1 signal shunt; Signal combiner in the 2nd to N-1 RF front-end module is connected with previous signal combiner respectively, and the signal shunt in the 2nd to N-1 RF front-end module is connected with previous signal shunt respectively.
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| CN101888717A (en) * | 2010-07-13 | 2010-11-17 | 华为技术有限公司 | Method and device for processing data and base station |
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| US20030022648A1 (en) * | 2001-07-27 | 2003-01-30 | J.S. Wight, Inc. | Selectable inversion / variable gain combiner for diversity reception in RF transceivers |
| US7184728B2 (en) * | 2002-02-25 | 2007-02-27 | Adc Telecommunications, Inc. | Distributed automatic gain control system |
| JP4133890B2 (en) * | 2004-03-24 | 2008-08-13 | 三洋電機株式会社 | Receiver |
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