CN102104416B - Digital repeater and downlink signal processing method thereof - Google Patents
Digital repeater and downlink signal processing method thereof Download PDFInfo
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- CN102104416B CN102104416B CN201010592418.8A CN201010592418A CN102104416B CN 102104416 B CN102104416 B CN 102104416B CN 201010592418 A CN201010592418 A CN 201010592418A CN 102104416 B CN102104416 B CN 102104416B
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Abstract
The invention discloses a digital repeater and a downlink signal processing method thereof. The method comprises the following steps of: S1, receiving a downlink signal transmitted by a base station and separating a downlink radio-frequency signal from the downlink signal; S2, detecting the downlink radio-frequency signal and extracting a base station signal of a base station with highest signal intensity; S3, generating a pseudo-pilot signal and a pseudo-synchronous signal, wherein the pseudo-pilot signal and the pseudo-synchronous signal are respectively the same as a corresponding pseudo-pilot signal and a corresponding pseudo-synchronous signal in the extracted base station signal; S4,combining the pseudo-pilot signal and the pseudo-synchronous signal with the downlink radio-frequency signal to form a selectively amplified downlink radio-frequency signal; and S5, processing the selectively amplified downlink radio-frequency signal and transmitting a processed downlink signal to a mobile terminal. The method reduces pilot pollution, eliminates a self-excitation loop, makes engineering installation and debugging become simpler, and also solves the problem of low call completion rate and handoff drop call.
Description
Technical field
The present invention relates to radio repeater system design field, relate in particular to a kind of digital high-frequency amplification station and downlink signal processing method thereof.
Background technology
Along with mobile communication business rapid growth, there is active demand in operator to the lifting of brand effect separately, and corresponding network quality requirement is also improving.The construction project expansion just like a raging fire such as each underground shelter, road covering at present.Repeater still has unlimited potentiality as effective extension network coverage means.For example, can adopt repeater to solve that in city, high-storey base station signal is poor, the mobile phone percent of call lost is high and switch the problems such as call drop that frequently cause when call.At the beginning of the nineties, the digital base stations such as GSM, CDMA technology is developed into from the original base station that simulates in base station, but due to reasons such as the technical strength of repeater producer, repeater is not also broken through and simulated amplifying technique, in lower technical merit.
Traditional repeater comprises that one two-wayly simulates amplifier, directly amplifies radiofrequency signal is simple, be above about to after mobile phone signal amplifies send to base station, under be about to send to mobile phone after base station signal amplification.As shown in Figure 1: at down direction, the antenna 1(donor antenna of repeater) receive the downstream signal of base station, amplify through descending amplifying circuit, the signal after amplification is by antenna 2(cover antenna) send to mobile phone; At up direction, the antenna 2(cover antenna of repeater) receive the upward signal of mobile phone, amplify through up amplifying circuit, the signal after amplification is through antenna 1(donor antenna) send to base station.
Traditional repeater is to the direct amplification forwarding of all base station signals, makes an uproar in the end of increased aerial frequency pollution and pilot pollution, having raised base station; Because the receive frequency of antenna 1 is identical with the transmission frequency of antenna 2, as shown in Figure 1, signal after descending amplifier amplifies, through antenna 2(cover antenna) send, the aerial signal sending is again by antenna 1(donor antenna) receive, then amplify through descending amplifier, after amplification again from antenna 2(cover antenna) send, so circulation amplify forms self-excitation, and such self-excitation is called outer shroud self-excitation, certainly goads into action and significantly increases signal noise; For fear of self-excitation, when fortification are installed, the general isolation technology that adopts directional antenna or body of wall to stop carries out close benefit, brings a lot of inconvenience to project installation and debugging.
Summary of the invention
The technical problem to be solved in the present invention is, for project installation and the large defect of debugging difficulty of the frequency pollution existing in prior art, pilot pollution, self-excitation problem and initiation thus, provides a kind of digital high-frequency amplification station and downlink signal processing method thereof.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of digital high-frequency amplification station is provided, and it is arranged between base station and mobile terminal, comprising:
Donor antenna, holds duplexer for receiving the downstream signal that base station transmitting comes and sending described downstream signal to alms giver, or holds upward signal that duplexer sends to described base station for launching described alms giver;
Alms giver holds duplexer, for isolating downlink radio-frequency signal from the described downstream signal receiving, or processes and export described upward signal for receiving up radiofrequency signal;
Control circuit, holds duplexer to be connected with described capped end duplexer with described alms giver, for detection of described downlink radio-frequency signal and therefrom extract the base station signal at the strong basis of signal station and for to pilot beacon and pseudo-synchronous circuit sending controling instruction;
Pilot beacon and pseudo-synchronous circuit, hold duplexer, described capped end duplexer to be connected with described control circuit with described alms giver, for generating dummy pilot signal and pseudo-synchronous signal according to the control command of described control circuit, described dummy pilot signal and pseudo-synchronous signal are identical with pilot signal and synchronizing signal corresponding in extracted base station signal respectively;
Mixer, holds duplexer, described capped end duplexer and described pilot beacon and pseudo-synchronous circuit to be connected with described alms giver, for described dummy pilot signal and described pseudo-synchronous signal and described downlink radio-frequency signal are merged into the downlink radio-frequency signal that selectivity is amplified;
Cover antenna, the upward signal coming for mobile terminal receive transmitting also sends described upward signal to capped end duplexer, or for launching downstream signal that described capped end duplexer sends to described mobile terminal;
Capped end duplexer, for isolating up radiofrequency signal from the described upward signal receiving, or processes and exports described downstream signal for the downlink radio-frequency signal amplifying from mixer receiver selectivity.
In digital high-frequency amplification station of the present invention, described control circuit further comprises:
Detecting unit, for detection of the base station signal at described downlink radio-frequency signal the strong basis of select-out signal station;
Decoding unit, for decode described base station signal and extract the pilot channel code of described base station signal and synchronizing channel code to obtain pilot signal and synchronizing signal.
In digital high-frequency amplification station of the present invention, described mixer further comprises:
Down-converter unit, for down-converting to baseband signal by described downlink radio-frequency signal;
Synthesis unit, for being incorporated to the time slot of the corresponding pilot tone of described baseband signal with the baseband signal of generation selectivity amplification by described dummy pilot signal and described pseudo-synchronous signal;
Up-conversion unit, up-converts to for the baseband signal that described selectivity is amplified the downlink radio-frequency signal that described selectivity is amplified.
In digital high-frequency amplification station of the present invention, the frequency of the downstream signal that the frequency of the downstream signal of described cover antenna transmitting receives from described donor antenna is different.
In digital high-frequency amplification station of the present invention, described mixer also comprises the digital filter circuit for described downlink radio-frequency signal being carried out to filtering processing.
The present invention also provides a kind of downlink signal processing method, comprises the following steps:
The downstream signal of S1, the transmitting of reception base station is also therefrom isolated downlink radio-frequency signal;
S2, detect described downlink radio-frequency signal and therefrom extract the base station signal at the strong basis of signal station;
S3, generate dummy pilot signal and pseudo-synchronous signal, described dummy pilot signal and pseudo-synchronous signal are identical with pilot signal and synchronizing signal corresponding in extracted base station signal respectively;
S4, described dummy pilot signal and described pseudo-synchronous signal and described downlink radio-frequency signal are merged into the downlink radio-frequency signal that selectivity is amplified;
S5, process the concurrent warp let-off processing of downlink radio-frequency signal that described selectivity amplifies downstream signal to mobile terminal.
In downlink signal processing method of the present invention, step S2 further comprises:
S21, detect the base station signal at described downlink radio-frequency signal the strong basis of select-out signal station;
S22, decode described base station signal and extract the pilot channel code of described base station signal and synchronizing channel code to obtain pilot signal and synchronizing signal.
In downlink signal processing method of the present invention, step S4 further comprises:
S41, described downlink radio-frequency signal is down-converted to baseband signal;
S42, described dummy pilot signal and described pseudo-synchronous signal are incorporated to the baseband signal that the time slot of the corresponding pilot tone of described baseband signal amplifies to generate selectivity;
S43, the baseband signal that described selectivity is amplified up-convert to the downlink radio-frequency signal that described selectivity is amplified.
In downlink signal processing method of the present invention, the frequency of described treated downstream signal is different from the frequency of the described downstream signal receiving from base station.
In downlink signal processing method of the present invention, also comprise described downlink radio-frequency signal is carried out to filtering processing.
The beneficial effect of a kind of digital high-frequency amplification station of the present invention and downlink signal processing method thereof is: owing to not being that base station signal to receiving carries out whole amplification forwardings, but produce useful dummy pilot signal and pseudo-synchronous signal superposition in downlink, and dummy pilot signal is identical with chosen former base station signal with pseudo-synchronous signal, pilot pollution and frequency are polluted and are just lowered to minimum limit, making an uproar in the end that does not increase base station, makes this intelligent digital station can be arranged on city; Owing to not being that base station signal to receiving carries out simple directly amplification forwarding, but adopt the digital technology of regeneration pilot tone and shared channel signal, there is no the loop of circulation amplify, the no longer self-excitation of intelligent digital station, noise is little; Intelligent digital station no-self excitation, interference base station not, project installation and debugging are just very convenient, can accomplish plug and play; Owing to only having strengthened pilot signal and the synchronizing signal of selection of base stations, the signal of other base station does not change, and mobile phone has had clear and definite primary pilot signal, has solved the not high problem of call completion ratio in skyscraper, has also solved the Special Handle of Drop Question that frequent switching causes simultaneously.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural representation of prior art repeater;
Fig. 2 is the structural representation of digital high-frequency amplification station according to an embodiment of the invention;
Fig. 3 is the structural representation of digital high-frequency amplification station in accordance with another embodiment of the present invention;
Fig. 4 is the flow chart of downlink signal processing method according to an embodiment of the invention.
Embodiment
Fig. 2 is the structural representation of digital high-frequency amplification station according to an embodiment of the invention.In the present embodiment, digital high-frequency amplification station 200 is arranged between base station and mobile terminal, and digital high-frequency amplification station 200 comprises up link and down link.Up link comprises that cover antenna 270, capped end duplexer 260, alms giver hold duplexer 220 and donor antenna 210, and down link comprises that donor antenna 210, alms giver hold duplexer 220, control circuit 230, pilot beacon and pseudo-synchronous circuit 240, mixer 250, capped end duplexer 260 and cover antenna 270.
In up link, donor antenna 210 holds duplexer 220 to be connected with cover antenna 270 with capped end duplexer 260 by alms giver successively.The upward signal that cover antenna 270 is come for mobile terminal receive transmitting also sends this upward signal to capped end duplexer 260.Capped end duplexer 260 obtains up radiofrequency signal for the upward signal filtering unwanted signal from receiving.Alms giver holds duplexer 220 to process and export this upward signal for receiving up radiofrequency signal from capped end duplexer 260.Donor antenna 210 holds upward signal that duplexer 260 sends to base station for launching alms giver.In various embodiment of the present invention, up link also comprises various amplifiers such as power amplification circuit, holds between duplexer 220 and capped end duplexer 260, for amplifying up radiofrequency signal alms giver.Should be understood that, these amplifier technology belong to prior art, in order to simplify accompanying drawing and explanation, amplifier are not shown in Fig. 2, are also no longer described in detail herein.
In the course of work of up link, the upward signal that capped end duplexer 260 receives from cover antenna 270, filtering unwanted signal obtains up radiofrequency signal, this up radiofrequency signal sends alms giver to and holds duplexer 220 after amplifier amplifies, and after alms giver holds duplexer 220 to be treated as upward signal, is transmitted to base station by donor antenna 210.
In down link, alms giver holds duplexer 220 to be connected with capped end duplexer 260 by mixer 250 with pilot beacon and pseudo-synchronous circuit 240, and control circuit 230 holds duplexer 220, pilot beacon and pseudo-synchronous circuit 240 and capped end duplexer 260 to be connected with alms giver respectively.
Donor antenna 210, can hold duplexer 220 for receiving the next downstream signal of base station transmitting and sending this downstream signal to alms giver.
Alms giver holds duplexer 220, can obtain downlink radio-frequency signal for filtering unwanted signal the downstream signal receiving from donor antenna 210.
Pilot beacon and pseudo-synchronous circuit 240, can be for generating dummy pilot signal and pseudo-synchronous signal according to the control command of control circuit 230.Pilot signal in the base station signal at the strong basis of the signal station that the dummy pilot signal that pilot beacon and pseudo-synchronous circuit 240 generate is extracted with control circuit 230 is identical.Synchronizing signal in the base station signal at the strong basis of the signal station that the pseudo-synchronous signal that pilot beacon and pseudo-synchronous circuit 240 generate extracts with control circuit 230 is identical.Pilot beacon and pseudo-synchronous circuit 240 can also be sent to mixer 250 by the dummy pilot signal of generation and pseudo-synchronous signal.In one embodiment of the invention, pilot beacon and pseudo-synchronous circuit 240 can be special signal generators, for generating corresponding dummy pilot signal and pseudo-synchronous signal according to the control command of control circuit 230, wherein, in control command, can comprise the signal parameters such as frequency, amplitude, phase place or duty ratio.In other embodiments of the invention, pilot beacon and pseudo-synchronous circuit 240 can also be simple transmission circuits, send mixer 250 to for pilot signal and corresponding synchronizing signal that control circuit 230 is extracted.
Capped end duplexer 260, for from mixer 250 receiver selectivities amplify downlink radio-frequency signal and it is processed to export downstream signal.
Cover antenna 270, for receiving downstream signal and this downstream signal being transmitted to mobile terminal from capped end duplexer 260.
In the course of work of down link, donor antenna 210 receives the next downstream signal of base station transmitting and sends this downstream signal to alms giver holds duplexer 220.Alms giver holds filtering unwanted signal the downstream signal that duplexer 220 receives from donor antenna 210 to obtain downlink radio-frequency signal.Control circuit 230 detects these downlink radio-frequency signals and therefrom extracts the base station signal at the strong basis of signal station, and then control circuit 230 makes pilot beacon and pseudo-synchronous circuit 240 generate dummy pilot signal and pseudo-synchronous signal according to the control command of control circuit 230 to pilot beacon and pseudo-synchronous circuit 240 sending controling instructions.Pilot signal in the base station signal at the strong basis of the signal station that the dummy pilot signal that pilot beacon and pseudo-synchronous circuit 240 generate is extracted with control circuit 230 is identical.Synchronizing signal in the base station signal at the strong basis of the signal station that the pseudo-synchronous signal that pilot beacon and pseudo-synchronous circuit 240 generate extracts with control circuit 230 is identical.Mixer 250 receives from pilot beacon and pseudo-synchronous circuit 240 dummy pilot signal and the pseudo-synchronous signal that generate, and holds duplexer 220 to receive downlink radio-frequency signal from alms giver.Next, dummy pilot signal and pseudo-synchronous signal and downlink radio-frequency signal are merged into the downlink radio-frequency signal that selectivity is amplified by mixer 250.The downlink radio-frequency signal that capped end duplexer 260 amplifies from mixer 250 receiver selectivities also processes to export downstream signal to it.Finally, this downstream signal is transmitted to mobile terminal by cover antenna 270.
Fig. 3 is the structural representation of digital high-frequency amplification station in accordance with another embodiment of the present invention.In the present embodiment, digital high-frequency amplification station 300 is arranged between base station and mobile terminal, and digital high-frequency amplification station 300 comprises up link and down link.Up link shown in up link and Fig. 2 is similar, is no longer described herein.Down link comprises that donor antenna 210, alms giver hold duplexer 220, control circuit 230, pilot beacon and pseudo-synchronous circuit 240, mixer 250, capped end duplexer 260 and cover antenna 270.Wherein, control circuit 230 further comprises detecting unit 231, decoding unit 232; Mixer 250 further comprises up-conversion unit 251, synthesis unit 252 and up-conversion unit 253.In other embodiments of the invention, mixer 250 also comprises digital filter circuit 254.Note, donor antenna 210, alms giver hold duplexer 220, pilot beacon and pseudo-synchronous circuit 240, capped end duplexer 260 and cover antenna 270 to have been described in detail in conjunction with Fig. 2.
Detecting unit 231, can and therefrom extract the base station signal at the strong basis of signal station for detection of the downlink radio-frequency signal of holding duplexer 220 to send from alms giver.When detection, can only detect the intensity of each base station pilot signals to judge the intensity of base station signal, because pilot signal is the Direct Sequence Spread Spectrum Signal that base station is launched non-modulated continuously, it makes mobile phone can obtain the forward direction CDMA channel time limit, correlation demodulation phase reference can also be provided, and for each base station provides signal strength signal intensity comparison, and mobile phone can be determined when switch.
Decoding unit 232, can for the base station signal at the strong basis of the signal station of extracting in decoding detecting unit 231 and extract the pilot channel code of this base station signal and synchronizing channel code to obtain pilot signal and synchronizing signal.In one embodiment of the invention, pilot channel code can be PN code, is used for distinguishing base station and user.Each PN code is corresponding to a time slot of base station, in channel corresponding to this time slot, is loaded with corresponding synchronizing signal.The decoding unit 232 PN code sequence of can decoding, finds the synchronizing signal of corresponding time slot according to decoded result.Then, the pilot signal that decoding unit 232 can obtain decoding and synchronizing signal send pilot beacon and pseudo-synchronous circuit 240 to, or the pilot signal being obtained according to decoding by control circuit 230 and synchronizing signal generate corresponding control command and send to pilot beacon and pseudo-synchronous circuit 240.
Down-converter unit 251, can be for down-converting to baseband signal by the downlink radio-frequency signal of holding duplexer 220 to receive from alms giver.In one embodiment of the invention, down-converter unit 251 can hold duplexer 220 to receive downlink radio-frequency signal from alms giver, and the local oscillation signal of this downlink radio-frequency signal and a characteristic frequency F1 is carried out to mixing obtain intermediate-freuqncy signal, then intermediate-freuqncy signal is carried out to down-converted obtain Analog Baseband i/q signal.Down-converter unit 251 can also send above-mentioned Analog Baseband i/q signal to synthesis unit 252 and amplify processing to carry out selectivity.
Up-conversion unit 253, can be for the baseband signal of amplifying from synthesis unit 252 receiver selectivities the downlink radio-frequency signal that is up-converted to selectivity amplification.In one embodiment of the invention, up-conversion unit 253 can receive Analog Baseband i/q signal and by its up-conversion intermediate-freuqncy signal from synthesis unit 252, then will after the local oscillation signal mixing of this intermediate-freuqncy signal and the second characteristic frequency F2, produce the downlink radio-frequency signal that selectivity is amplified.
In the course of work of down link, donor antenna 210 receives the next downstream signal of base station transmitting and sends this downstream signal to alms giver holds duplexer 220.Alms giver holds filtering unwanted signal the downstream signal that duplexer 220 receives from donor antenna 210 to obtain downlink radio-frequency signal.In another embodiment of the present invention, alms giver holds the noise of all right other frequency band of filtering of filter in duplexer 220.
Then, detecting unit 231 detects from alms giver and holds the downlink radio-frequency signal that duplexer 220 sends and therefrom extract the base station signal at the strong basis of signal station.Decoding unit 232 decode the strong basis of the signal that extracts in detecting unit 231 station base station signal and extract the pilot channel code of this base station signal and synchronizing channel code to obtain pilot signal and synchronizing signal.In one embodiment of the invention, the decoding unit 232 PN code sequence of can decoding, finds the synchronizing signal of corresponding time slot according to decoded result.Then, the pilot signal that decoding unit 232 can obtain decoding and synchronizing signal send pilot beacon and pseudo-synchronous circuit 240 to, or the pilot signal being obtained according to decoding by control circuit 230 and synchronizing signal generate corresponding control command and send to pilot beacon and pseudo-synchronous circuit 240.Pilot beacon and pseudo-synchronous circuit 240 generate dummy pilot signal and pseudo-synchronous signal according to the control command of control circuit 230.Pilot signal in the base station signal at the strong basis of the signal station that the dummy pilot signal that pilot beacon and pseudo-synchronous circuit 240 generate is extracted with control circuit 230 is identical.Synchronizing signal in the base station signal at the strong basis of the signal station that the pseudo-synchronous signal that pilot beacon and pseudo-synchronous circuit 240 generate extracts with control circuit 230 is identical.
Next, the downlink radio-frequency signal of holding duplexer 220 to receive from alms giver is down-converted to baseband signal by down-converter unit 251.In another embodiment of the present invention, can also carry out filtering processing so that filtering noise to this baseband signal by digital filter circuit 254.Synthesis unit 252 receives dummy pilot signal and pseudo-synchronous signal and receives Analog Baseband i/q signal from down-converter unit 251 from pilot beacon and pseudo-synchronous circuit 240.Then, the dummy pilot signal that synthesis unit 252 generates pilot beacon and pseudo-synchronous circuit 240 and pseudo-synchronous signal are incorporated to the Analog Baseband i/q signal that the time slot of the corresponding pilot tone of Analog Baseband i/q signal amplifies to generate selectivity, in the Analog Baseband i/q signal amplifying in this selectivity, the base station signal that has only amplified the strong basis of signal station, has strengthened dominant pilot.After settling signal stack, the Analog Baseband i/q signal that synthesis unit 252 amplifies selectivity sends up-conversion unit 253 to.The baseband signal that up-conversion unit 253 amplifies from synthesis unit 252 receiver selectivities is also up-converted to the downlink radio-frequency signal of selectivity amplification to send.In another embodiment of the present invention, can also carry out filtering processing so that filtering noise to this downlink radio-frequency signal by digital filter circuit 254.
The downlink radio-frequency signal that capped end duplexer 260 amplifies from up-conversion unit 253 receiver selectivities also processes to export downstream signal to it.In another embodiment of the present invention, the noise in all right filtering downstream signal of the filter in capped end duplexer 260.Finally, by cover antenna 270, treated downstream signal is transmitted to mobile terminal.The frequency of the downstream signal of transmitting is different from the frequency of the downstream signal receiving by donor antenna 210 herein.
Fig. 4 is the flow chart of downlink signal processing method according to an embodiment of the invention.In the present embodiment, start from step S1 for a kind of downlink signal processing method of the digital high-frequency amplification station shown in Fig. 2 or 3.In step S1, receive the downstream signal of base station transmitting and therefrom isolate downlink radio-frequency signal.In one embodiment of the invention, receive downstream signal that base station transmitting comes and from this downstream signal filtering unwanted signal obtain downlink radio-frequency signal.In another embodiment of the present invention, can also comprise the noise of other frequency band of filtering.
In step S2, detect downlink radio-frequency signal and therefrom extract the base station signal at the strong basis of signal station.In one embodiment of the invention, detect the base station signal at the strong basis of downlink radio-frequency signal select-out signal station, this base station signal extract pilot channel code and the synchronizing channel code of this base station signal of then decoding, to obtain pilot signal and synchronizing signal.In another embodiment of the present invention, detect the base station signal at the strong basis of downlink radio-frequency signal select-out signal station, the PN code sequence of this base station signal of then decoding, finds the synchronizing signal of corresponding time slot according to decoded result.In another embodiment of the present invention, the pilot signal that can also obtain according to decoding and synchronizing signal generate corresponding control command, can comprise that frequency, amplitude, phase place or duty ratio etc. are for generating the signal parameter of corresponding signal in this control command.
In step S3, generate dummy pilot signal and pseudo-synchronous signal, this dummy pilot signal and pseudo-synchronous signal are identical with pilot signal and synchronizing signal corresponding in extracted base station signal respectively.In one embodiment of the invention, can generate corresponding dummy pilot signal and pseudo-synchronous signal according to above-mentioned control command, wherein, in control command, can comprise the signal parameters such as frequency, amplitude, phase place or duty ratio.In other embodiments of the invention, can also directly transmit the pilot signal of extraction and corresponding synchronizing signal.
In step S4, dummy pilot signal and pseudo-synchronous signal and downlink radio-frequency signal are merged into the downlink radio-frequency signal that selectivity is amplified.In one embodiment of the invention, downlink radio-frequency signal is down-converted to baseband signal, again dummy pilot signal and pseudo-synchronous signal are incorporated to the time slot of the corresponding pilot tone of baseband signal with the baseband signal of generation selectivity amplification, the baseband signal of finally this selectivity being amplified up-converts to the downlink radio-frequency signal that selectivity is amplified.In another embodiment of the present invention, downlink radio-frequency signal can be down-converted to Analog Baseband i/q signal, this Analog Baseband i/q signal is carried out to filtering processing so that filtering noise, then the dummy pilot signal of generation and pseudo-synchronous signal are incorporated to the time slot of the corresponding pilot tone of Analog Baseband i/q signal with the Analog Baseband i/q signal of generation selectivity amplification, in the Analog Baseband i/q signal amplifying in this selectivity, only amplify the base station signal at the strong basis of signal station, strengthened dominant pilot, after settling signal stack, the Analog Baseband i/q signal that selectivity is amplified up-converts to the downlink radio-frequency signal that selectivity is amplified, can also carry out filtering processing so that filtering noise to this downlink radio-frequency signal.
In step S5, the downstream signal of the concurrent warp let-off processing of downlink radio-frequency signal that processing selecting is amplified is to mobile terminal.In one embodiment of the invention, downlink radio-frequency signal selectivity being amplified is processed and is obtained the downstream signal for sending and launch.In another embodiment of the present invention, can also comprise the noise of other frequency band of filtering.In various embodiment of the present invention, the frequency of the downstream signal of transmitting is different from the frequency of the downstream signal receiving in step S1 herein again.
In the present invention, use digital technology to produce dummy pilot signal and pseudo-synchronous signal, the dummy pilot signal producing is identical with chosen former base station signal with pseudo-synchronous signal, the signal producing is added in down link, to strengthen pilot signal and the synchronizing signal of this base station, realize the amplification to useful signal.And the signal that there is no chosen base station will can not be exaggerated forwarding, not only realize pilot tone and strengthened function, also pilot pollution and frequency pollution are reduced to minimum limit, and do not increase the end bath of base station.The present invention has overcome the pilot pollution problem of skyscraper, makes this digital high-frequency amplification station can be arranged on city.
In addition, the present invention directly amplifies the simple of signal, but adopts the digital technology of regeneration pilot tone and shared channel signal, has cancelled the loop of circulation amplify, there is no free-running circuit, has exempted self-excitation, has reduced noise.And the present invention is by digital filtering and shift frequency, guarantee on the one hand the isolation that up-downgoing is very high, on the other hand uplink and downlink works on different frequency, thereby avoided self-excitation.
Due to digital high-frequency amplification station no-self excitation provided by the present invention, interference base station not, project installation and debugging are just very convenient, can accomplish plug and play.The installation that is embodied in antenna is very simple, and the debugging of equipment is also very easy, has also reduced cost simultaneously.
In addition, because the present invention has only strengthened pilot signal and the synchronizing signal of selection of base stations, the signal of other base station does not change, and mobile phone has had clear and definite primary pilot signal, solve the not high problem of call completion ratio in skyscraper, also solved the Special Handle of Drop Question that frequent switching causes simultaneously.
The present invention can be applied in the communication system systems such as GSM, CDMA, DCS, JDC, TD-SCDMA, WCDMA, CDMA2000, forms the digital direct discharging station of different communication standard.
Although the present invention describes by specific embodiment, it will be appreciated by those skilled in the art that, without departing from the present invention, can also carry out various conversion and be equal to alternative the present invention.In addition, for particular condition or material, can make various modifications to the present invention, and not depart from the scope of the present invention.Therefore, the present invention is not limited to disclosed specific embodiment, and should comprise the whole execution modes that fall within the scope of the claims in the present invention.
Claims (10)
1. a digital high-frequency amplification station, it is arranged between base station and mobile terminal, it is characterized in that, comprising:
Donor antenna, holds duplexer for receiving the downstream signal that base station transmitting comes and sending described downstream signal to alms giver, or holds upward signal that duplexer sends to described base station for launching described alms giver;
Alms giver holds duplexer, for isolating downlink radio-frequency signal from the described downstream signal receiving, or processes and export described upward signal for receiving up radiofrequency signal;
Control circuit, holds duplexer to be connected with capped end duplexer with described alms giver, for detection of described downlink radio-frequency signal and therefrom extract the base station signal at the strong basis of signal station and for to pilot beacon and pseudo-synchronous circuit sending controling instruction;
Pilot beacon and pseudo-synchronous circuit, hold duplexer, described capped end duplexer to be connected with described control circuit with described alms giver, for generating dummy pilot signal and pseudo-synchronous signal according to the control command of described control circuit, described dummy pilot signal and pseudo-synchronous signal are identical with pilot signal and synchronizing signal corresponding in extracted base station signal respectively;
Mixer, holds duplexer, described capped end duplexer and described pilot beacon and pseudo-synchronous circuit to be connected with described alms giver, for described dummy pilot signal and described pseudo-synchronous signal and described downlink radio-frequency signal are merged into the downlink radio-frequency signal that selectivity is amplified;
Cover antenna, the upward signal coming for mobile terminal receive transmitting also sends described upward signal to capped end duplexer, or for launching downstream signal that described capped end duplexer sends to described mobile terminal;
Capped end duplexer, for isolating up radiofrequency signal from the described upward signal receiving, or processes and exports described downstream signal for the downlink radio-frequency signal amplifying from mixer receiver selectivity.
2. digital high-frequency amplification station according to claim 1, is characterized in that, described control circuit further comprises: detecting unit, for detection of the base station signal at described downlink radio-frequency signal the strong basis of select-out signal station;
Decoding unit, for decode described base station signal and extract the pilot channel code of described base station signal and synchronizing channel code to obtain pilot signal and synchronizing signal.
3. digital high-frequency amplification station according to claim 1, is characterized in that, described mixer further comprises:
Down-converter unit, for down-converting to baseband signal by described downlink radio-frequency signal;
Synthesis unit, for being incorporated to the time slot of the corresponding pilot tone of described baseband signal with the baseband signal of generation selectivity amplification by described dummy pilot signal and described pseudo-synchronous signal;
Up-conversion unit, up-converts to for the baseband signal that described selectivity is amplified the downlink radio-frequency signal that described selectivity is amplified.
4. digital high-frequency amplification station according to claim 1, is characterized in that, the frequency of the downstream signal that the frequency of the downstream signal of described cover antenna transmitting receives from described donor antenna is different.
5. digital high-frequency amplification station according to claim 1, is characterized in that, described mixer also comprises the digital filter circuit for described downlink radio-frequency signal being carried out to filtering processing.
6. a downlink signal processing method, is characterized in that, comprises the following steps:
The downstream signal of S1, the transmitting of reception base station is also therefrom isolated downlink radio-frequency signal;
S2, detect described downlink radio-frequency signal and therefrom extract the base station signal at the strong basis of signal station;
S3, generate dummy pilot signal and pseudo-synchronous signal, described dummy pilot signal and pseudo-synchronous signal are identical with pilot signal and synchronizing signal corresponding in extracted base station signal respectively;
S4, described dummy pilot signal and described pseudo-synchronous signal and described downlink radio-frequency signal are merged into the downlink radio-frequency signal that selectivity is amplified;
S5, process the concurrent warp let-off processing of downlink radio-frequency signal that described selectivity amplifies downstream signal to mobile terminal.
7. downlink signal processing method according to claim 6, is characterized in that, step S2 further comprises:
S21, detect the base station signal at described downlink radio-frequency signal the strong basis of select-out signal station;
S22, decode described base station signal and extract the pilot channel code of described base station signal and synchronizing channel code to obtain pilot signal and synchronizing signal.
8. downlink signal processing method according to claim 6, is characterized in that, step S4 further comprises:
S41, described downlink radio-frequency signal is down-converted to baseband signal;
S42, described dummy pilot signal and described pseudo-synchronous signal are incorporated to the baseband signal that the time slot of the corresponding pilot tone of described baseband signal amplifies to generate selectivity;
S43, the baseband signal that described selectivity is amplified up-convert to the downlink radio-frequency signal that described selectivity is amplified.
9. downlink signal processing method according to claim 6, is characterized in that, the frequency of described treated downstream signal is different from the frequency of the described downstream signal receiving from base station.
10. downlink signal processing method according to claim 6, is characterized in that, also comprises described downlink radio-frequency signal is carried out to filtering processing.
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| CN101651498A (en) * | 2009-08-28 | 2010-02-17 | 深圳市云海通讯股份有限公司 | Repeater and method for removing pilot frequency pollution by same |
| CN101719782A (en) * | 2009-11-26 | 2010-06-02 | 三维通信股份有限公司 | td-scdma wireless repeater |
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| CN101651498A (en) * | 2009-08-28 | 2010-02-17 | 深圳市云海通讯股份有限公司 | Repeater and method for removing pilot frequency pollution by same |
| CN101719782A (en) * | 2009-11-26 | 2010-06-02 | 三维通信股份有限公司 | td-scdma wireless repeater |
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