CN101521539A - Wideband digital frequency-selecting wireless repeater system and wideband signal digital frequency-selecting method thereof - Google Patents
Wideband digital frequency-selecting wireless repeater system and wideband signal digital frequency-selecting method thereof Download PDFInfo
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Abstract
The invention provides a wideband digital frequency-selecting wireless repeater system and a wideband signal digital frequency-selecting method thereof. The donor antenna output terminal of the system is connected with a retransmission antenna input terminal by an donor terminal diplexer, a downlink radio frequency receiver subsystem, a downlink wideband digital intermediate frequency processing subsystem, a downlink radio frequency transmitter subsystem, and a mobile terminal diplexer in sequence; a retransmission antenna output terminal is connected with a donor antenna input terminal by a mobile terminal diplexer, an uplink radio frequency receiver subsystem, an uplink wideband digital intermediate frequency processing subsystem, an uplink radio frequency transmitter subsystem, and a donor terminal diplexer in sequence. The invention can be applied to communication systems such as GSM, CDMA, DCS, JDC, TD-SCDMA, WCDMA, CDMA2000, and the like, thereby forming wideband digital frequency-selecting wireless repeater systems with different communication formats and any signal bandwidth.
Description
Technical field
The present invention relates to wireless discharging-directly station, be specifically related to wideband digital frequency-selecting wireless repeater system and wideband signal digital frequency-selecting method thereof.
Background technology
Along with popularizing of mobile communications networks such as GSM, CDMA, TD-SCDMA, the rapid increase of mobile communication subscriber quantity, telephone traffic among the mobile network is also constantly increasing, cause communication network to be in the overload operation state, be easy to occur being similar to go offline, cross-talk, speech quality are bad, be difficult to phenomena of the failure such as online.In the face of growing traffic demand, need carry out dilatation to satisfy the requirement of capacity and covering to network.Adopt the dilatation way of cell splitting that its limitation is arranged, constantly approaching along with stop spacing, therefore the interference of network just is difficult in the new base station of increase in the network also in continuous increase after the stop spacing of macrocell base stations acquires a certain degree.The repeater is as network optimization product, can improve and optimize the network signal covering quality, solving the indoor degree of depth covering of wireless signal, solving signal covering aspect, the weak district of signal blind zone and signal and all play an important role, at home and abroad all obtaining in the mobile communications network using widely.
Wireless discharging-directly station plays a very important role at tool aspect the covering of indoor and outdoor mobile communication signal.At present, in mobile communication engineering, using more is single carrier or broadband artificial antenna direct discharging station.Mainly be to adopt a SAW (Surface Acoustic Wave) filter to realize the single carrier arrowband or the frequency-selective filtering of broadband analog signal are handled.Broadband signal refers to the full frequency band bandwidth signal of a certain communication system correspondence or the signal of the interior band segment of full frequency band, adopt 900MHz frequency band GSM communication system as China, uplink band is 885～915MHz, the GSM bandwidth signal refers to the signal of any bandwidth in this frequency range, as signals such as 400KHz, 1MHz, 5MHz and 24MHz bandwidth.Broadband signal though bandwidth is very wide, in essence, only is a single-carrier signal that bandwidth is very wide, can adopt the filter processing method of single carrier to realize signal frequency-selecting processing fully.Fig. 1 is single carrier or artificial antenna repeater, broadband principle schematic.Its operation principle is as follows: retransmitting antenna receives the upward signal of overlay area, the downstream signal that donor antenna receives from the base station passes through low noise amplifier, SAW (Surface Acoustic Wave) filter, power amplifier separately, go out from donor antenna and transmission antennas transmit through duplexer respectively, thereby realize the processing and amplifying of uplink and downlink signal, improve the wireless coverage effect of mobile communications network.
The artificial antenna direct discharging station that adopts analogue technique to realize, mainly there are the following problems:
(1) need SAW (Surface Acoustic Wave) filter to carry out frequency-selective filtering and handle, because SAW (Surface Acoustic Wave) filter is an analogue device, the consistency of performance is bad, and debugging difficulty is very big, is unfavorable for production debugging and batch process; (2) in radio repeater system, need a plurality of local oscillation signal reference sources, because the local oscillation signal poor stability that analogue device produces, frequency of occurrences skew easily, cause input, the output frequency of system to be offset, direct discharging station is easy to occur frequency deviation, causes system normally to use; (3) linear characteristic of analog multiplier is bad, and the phase place after the mixing can change, and differential loss needs amplifier offset, thereby introduces more active noise; (4) the analog filter filtering characteristic is difficult to regulate and is difficult for changing with concrete demands of applications; (5) small product size is bigger, and weight is heavier, is difficult to realize miniaturization, lightness design; (6) the broadband wireless direct discharging station of the analog hardware circuit design of employing function singleness, very flexible, very difficult adaptation is the demand of the wireless communication system of different communication system, multiband nowadays.
Summary of the invention
The objective of the invention is to overcome the shortcoming of existing simulation broad band repeater systems technology, wideband digital frequency-selecting wireless repeater system and wideband signal digital frequency-selecting method thereof are provided, and scalability of the present invention is good, reduced cost, be convenient to debug and produce and be convenient to realize miniaturization, microminiaturized direct discharging station.
Purpose of the present invention is achieved through the following technical solutions: wideband digital frequency-selecting wireless repeater system, comprise up link, down link, repeater power subsystem and monitoring repeater subsystem, described up link, down link comprises alms giver's terminal duplexer, the portable terminal duplexer, donor antenna, retransmitting antenna, it is characterized in that, described down link also comprises the downlink radio frequency receiver subsystem, downstream broadband signal digital intermediate frequency process subsystem, downlink radio frequency transmitter subsystem, described donor antenna output are successively by alms giver's terminal duplexer, the downlink radio frequency receiver subsystem, downstream broadband signal digital intermediate frequency process subsystem, the downlink radio frequency transmitter subsystem, the portable terminal duplexer is connected with the retransmitting antenna input; Described up link also comprises up radio-frequency transmitter subsystem, up broadband signal digital intermediate frequency process subsystem, up radio frequency sending set subsystem, and described retransmitting antenna output is connected with the donor antenna input by portable terminal duplexer, up radio-frequency transmitter subsystem, up broadband signal digital intermediate frequency process subsystem, up radio frequency sending set subsystem, alms giver's terminal duplexer successively; Described repeater power subsystem and monitoring repeater subsystem are connected with downlink radio frequency receiver subsystem, downstream broadband signal digital intermediate frequency process subsystem, downlink radio frequency transmitter subsystem, up radio-frequency transmitter subsystem, up broadband signal digital intermediate frequency process subsystem, up radio frequency sending set subsystem respectively simultaneously.
For realizing the present invention better, described downlink radio frequency receiver subsystem comprises descending low noise amplifier, downlink radio frequency down-conversion subsystem; The output of described descending low noise amplifier is connected with downlink radio frequency down-conversion subsystem input, described descending low noise amplifier input is connected with the output of alms giver's terminal duplexer, and described downlink radio frequency down-conversion subsystem output is connected with the input of downstream broadband signal digital intermediate frequency process subsystem;
Described downlink radio frequency transmitter subsystem comprises downlink radio frequency up-conversion subsystem, downlink power amplifier; Described downlink radio frequency up-conversion subsystem output is connected with the downlink power amplifier input, the input of described downlink radio frequency up-conversion subsystem is connected with downstream broadband signal digital intermediate frequency process subsystem output, and the output of described downlink power amplifier is connected with portable terminal duplexer input;
Described up radio-frequency transmitter subsystem comprises up low noise amplifier, up radio frequency down-conversion subsystem; The output of described up low noise amplifier is connected with up radio frequency down-conversion subsystem input, the input of described up low noise amplifier is connected with the output of portable terminal duplexer, and the output of described up radio frequency down-conversion subsystem is connected with the input of up broadband signal digital intermediate frequency process subsystem;
Described up radio frequency sending set subsystem comprises ascending power amplifier, up RF up-converter subsystem; The output of described up RF up-converter subsystem is connected with the ascending power amplifier input terminal, the input of described up RF up-converter subsystem is connected with the output of up broadband signal digital intermediate frequency process subsystem, and the output of described ascending power amplifier is connected with the input of alms giver's terminal duplexer.
Described downstream broadband signal digital intermediate frequency process subsystem and up broadband signal digital intermediate frequency process subsystem comprise A/D converter, broadband signal digital down-conversion subsystem, broadband signal digital up-conversion subsystem, D/A converter respectively, and described A/D converter output is connected with the D/A converter input by broadband signal digital down-conversion subsystem, broadband signal digital up-conversion subsystem successively.
Described broadband signal digital down-conversion subsystem mainly is the wideband digital intermediate-freuqncy signal to be carried out processing such as digital mixing, extraction and digital filtering, and intermediate-freuqncy signal is moved zero intermediate frequency, the digital signal of two-forty is extracted be the baseband digital signal of low rate.Broadband signal digital down-conversion subsystem mainly is made up of frequency mixing module, NCO generation module, DDC self-adaptive decision device, multiple variable extraction filter and base band formed filter among the present invention.NCO generation module in the described broadband signal digital down-conversion subsystem is connected with an end of frequency mixing module, and the other end of frequency mixing module is connected with the output of A/D modular converter; The output of described frequency mixing module is connected with the input of DDC self-adaptive decision device; The output of described DDC self-adaptive decision device is connected with the input of multiple variable extraction filter; The output of described multiple variable extraction filter is connected with the input of base band formed filter.
Described broadband signal digital up-conversion subsystem mainly is base band data to be carried out processing such as interpolation, digital filtering and digital mixing, signal is modulated to predetermined intermediate frequency, is the digital signal that satisfies intermediate frequency Nyquist sampling thheorem with the digital signal interpolation of low rate.Described broadband signal digital up-conversion subsystem mainly is made up of DUC self-adaptive decision device, the variable interpolation filter group of multiple and I, the multistage modulation module of Q signal.The input of the variable interpolation filter group of multiple in the output of the DUC self-adaptive decision device in the described broadband signal digital up-conversion subsystem and the DUC submodule is connected; I in the output of the variable interpolation filter group of multiple in the described DUC submodule and the DUC submodule, the input of the multistage modulation module of Q signal are connected.
Adopt the wideband signal digital frequency-selecting method of above-mentioned wideband digital frequency-selecting wireless repeater system, comprise the transmission of downstream signal and the transmission of upward signal;
Wherein, the transmission of described downstream signal may further comprise the steps:
(1) donor antenna receives the downstream signal from the base station, by alms giver's terminal duplexer, is input to the downlink radio frequency receiver subsystem;
(2) the descending low noise amplifier of downlink radio frequency receiver subsystem carries out processing and amplifying to the downstream signal from alms giver's terminal duplexer, and the downlink radio frequency down-conversion subsystem by the downlink radio frequency receiver subsystem, realization is to the mixing of radiofrequency signal, the down-converted of filtering, and the Low Medium Frequency signal is simulated in output;
(3) analog if signal of downlink radio frequency receiver subsystem output is input to downstream broadband signal digital intermediate frequency process subsystem, broadband signal digital intermediate frequency process subsystem carries out A/D sampling, broadband signal digital down-conversion, broadband signal digital up-conversion and D/A conversion process to analog if signal, the output analog if signal;
(4) analog if signal of downstream broadband signal digital intermediate frequency process subsystem output, be input to the downlink radio frequency transmitter subsystem, the downlink radio frequency up-conversion subsystem of downlink radio frequency transmitter subsystem is realized the mixing of analog if signal, the upconversion process of filtering, and the output radiofrequency signal, the radiofrequency signal of downlink radio frequency up-conversion subsystem output obtains further power amplification by downlink power amplifier and handles;
(5) radiofrequency signal of handling through power amplification by portable terminal duplexer and retransmitting antenna, realizes the signal of specific region is covered;
The transmission of described upward signal may further comprise the steps:
(A) retransmitting antenna receives the upward signal of overlay area, by the portable terminal duplexer, is input to up radio-frequency transmitter subsystem;
(B) the up low noise amplifier of up radio-frequency transmitter subsystem carries out processing and amplifying to the upward signal from the portable terminal duplexer, and the up radio frequency down-conversion subsystem by up radio-frequency transmitter subsystem, realization is to the mixing of radiofrequency signal, the down-converted of filtering, and the Low Medium Frequency signal is simulated in output;
(C) analog if signal of up radio-frequency transmitter subsystem output is input to up broadband signal digital intermediate frequency process subsystem, broadband signal digital intermediate frequency process subsystem carries out A/D sampling, broadband signal digital down-conversion, broadband signal digital up-conversion and D/A conversion process to analog if signal, the output analog if signal;
(D) analog if signal of up broadband signal digital intermediate frequency process subsystem output, be input to up radio frequency sending set subsystem, the up RF up-converter subsystem of up radio frequency sending set subsystem is realized the mixing of analog if signal, the upconversion process of filtering, and the output radiofrequency signal, the radiofrequency signal of up RF up-converter subsystem output obtains further power amplification by the ascending power amplifier and handles;
(E) through the radiofrequency signal of ascending power processing and amplifying, by alms giver's terminal duplexer and donor antenna, the realization subscriber signal is connected with the base station.
Broadband signal digital down-conversion signal handling process in the described step (3) is as follows: broadband signal digital down-conversion subsystem receives the digital medium-frequency signal from the output of A/D modular converter, cos and sin signal that digital medium-frequency signal and NCO generation module produce are input in the frequency mixing module simultaneously, and output is through zero intermediate frequency I, Q signal after the Frequency mixing processing.Zero intermediate frequency I, the Q signal of frequency mixing module output are input in the DDC self-adaptive decision device, DDC self-adaptive decision device is according to the characteristic information of I, Q signal, as information such as data speed, processing bandwidth, adaptive selection meets data pick-up multiple and the filter coefficient that speed, bandwidth etc. require.Described multiple variable extraction filter receives from the output information of DDC self-adaptive decision device and I, Q signal, and the information that provides according to DDC self-adaptive decision device, carry out the extraction and the Filtering Processing of data, I, Q signal after output is handled through suitable filtering extraction.The I of multiple variable extraction filter output, Q signal, owing to select and be with the outer requirement that signal does not usually meet the digital frequency-selecting module that suppresses in the band of signal, need be to the I behind the filtering extraction, the outer inhibition of compensation and band handled in Q signal was with, therefore, need to adopt the base band formed filter to carry out the moulding Filtering Processing, the base band formed filter is according to the demand of digital frequency-selecting module, in conjunction with digital frequency-selecting module passband fluctuation, the outer requirement that suppresses of band, design has the digital filter of compensate function in the passband, realization is to the compensation deals of signal in the passband, simultaneously, improve the outer inhibition ability of band, improve the performance of digital frequency-selecting module.Variable multiple decimation filter and base band formed filter can be the filter of FIR, IIR, CIC, HB filter or other form.Described broadband signal digital down-conversion subsystem can utilize programmable logic devices such as CPLD, FPGA, EPLD, DSP to realize, also can use special-purpose asic chip to realize.
Broadband signal digital up-conversion signal handling process in the described step (3) is as follows: mixing, extraction and filtered baseband I, Q data through broadband signal digital down-conversion subsystem are input in the DUC self-adaptive decision device in the broadband signal digital up-conversion subsystem and go.DUC self-adaptive decision device is according to characteristic informations such as the data rate of baseband I, Q data, bandwidth, and requirement such as the data rate that requires to export in conjunction with the digital intermediate frequency system, bandwidth, adaptive selection meets the interpolation of data multiple that speed, bandwidth etc. require, and according to the still multistage interpolation processing of the definite selection of multiple one-level interpolation processing, and, reasonably select the coefficient of interpolation filter etc. according to the requirement that each grade interpolation is handled.The variable interpolation filter group of received of described multiple is from the output information of DUC self-adaptive decision device and I, Q signal, and the information that provides according to DUC self-adaptive decision device, carry out the interpolation and the Filtering Processing of data, I, Q signal after output is handled through suitable interpolation filtering.The variable interpolation filter group of this multiple can be made up of the one-level interpolation filter, also can be made up of multistage interpolation filter group, generally speaking, only needs to use 1～2 grade of interpolation filter to get final product.The interpolation of the variable interpolation filter group of process multiple and the I after the Filtering Processing, Q signal are input in I, the multistage modulation module of Q signal and go, through the multistage mixing and the modulation treatment of I, the multistage modulation module of Q signal, and output digital intermediate frequency I, Q signal at a high speed.I, the multistage modulation module of Q signal generally are made up of 1～2 grade of mixed modulated module, if in the follow-up DAC submodule, have the one-level mixed modulated and handle, and then I, the multistage modulation module of Q signal can omit the processing of one-level mixed modulated.Filter in the variable interpolation filter group of described multiple can be the filter of FIR, IIR, CIC, HB filter or other form.Described broadband signal digital up-conversion subsystem can utilize programmable logic devices such as CPLD, FPGA, EPLD, DSP to realize, also can use special-purpose asic chip to realize.
The broadband signal digital down-converted is identical with broadband signal digital upconversion process mode with the middle broadband signal digital down-converted of broadband signal digital upconversion process mode and step (3) in the above-mentioned steps (C).
The present invention compared with prior art has following advantage and beneficial effect:
(1) based on software radio thought, adopt extraction, interpolation, mixing and the Filtering Processing of digital if technology realization to broadband signal, abandoned the processing method of utilizing SAW filtering in the simulation direct discharging station, reduced the use of analogue device, improve the consistency of systematic function, be convenient to system debug and production.
(2) adopt the method for digital filtering, it is very little that the passband fluctuation of filter can be done, and is with very high that outer inhibition can do, and improved the performance of signal filtering; The phase place of digital filter has good linear characteristic, has avoided the influence of the phase nonlinear of SAW to systematic function.
(3) can keep arbitrarily to change the bandwidth of signal as requested under the constant situation of hardware platform; Simultaneously, only need the software in the modification system, just can accomplish the compatible digital frequency-selecting wireless repeater system of the different bandwidth of standard arbitrarily fully, system has good applicability and extensibility.
(4) be easy to realize the miniaturization and the microminiaturization of wideband digital frequency-selecting wireless repeater system.
(5) the present invention can be applicable in the communication system systems such as GSM, CDMA, DCS, JDC, TD-SCDMA, WCDMA, CDMA2000, forms the wideband digital frequency-selecting wireless repeater system of different communication standard.
Description of drawings
Fig. 1 is single carrier or artificial antenna repeater, broadband principle schematic;
Fig. 2 is the theory diagram of wideband digital frequency-selecting wireless repeater system of the present invention;
Fig. 3 is downstream broadband signal digital intermediate frequency process subsystem of the present invention or up broadband signal digital intermediate frequency process subsystem structure block diagram;
Fig. 4 is a broadband signal digital down-conversion subsystem schematic diagram of the present invention;
Fig. 5 is a broadband signal digital up-conversion subsystem schematic diagram of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 2, wideband digital frequency-selecting wireless repeater system comprises up link, down link, repeater power subsystem and monitoring repeater subsystem, described up link, down link comprises alms giver's terminal duplexer, the portable terminal duplexer, donor antenna, retransmitting antenna, described down link also comprises the downlink radio frequency receiver subsystem, downstream broadband signal digital intermediate frequency process subsystem, the downlink radio frequency transmitter subsystem, described donor antenna output passes through duplexer successively, the downlink radio frequency receiver subsystem, downstream broadband signal digital intermediate frequency process subsystem, the downlink radio frequency transmitter subsystem, alms giver's terminal duplexer, the portable terminal duplexer is connected with the retransmitting antenna input; Described up link also comprises up radio-frequency transmitter subsystem, up broadband signal digital intermediate frequency process subsystem, up radio frequency sending set subsystem, and described retransmitting antenna output is connected with the donor antenna input by portable terminal duplexer, up radio-frequency transmitter subsystem, up broadband signal digital intermediate frequency process subsystem, up radio frequency sending set subsystem, alms giver's terminal duplexer successively; Described repeater power subsystem and monitoring repeater subsystem are connected with downlink radio frequency receiver subsystem, downstream broadband signal digital intermediate frequency process subsystem, downlink radio frequency transmitter subsystem, up radio-frequency transmitter subsystem, up broadband signal digital intermediate frequency process subsystem, up radio frequency sending set subsystem respectively simultaneously.
Described downlink radio frequency receiver subsystem comprises descending low noise amplifier, downlink radio frequency down-conversion subsystem; The output of described descending low noise amplifier is connected with downlink radio frequency down-conversion subsystem input, described descending low noise amplifier input is connected with the output of alms giver's terminal duplexer, and described downlink radio frequency down-conversion subsystem output is connected with the input of downstream broadband signal digital intermediate frequency process subsystem;
Described downlink radio frequency transmitter subsystem comprises downlink radio frequency up-conversion subsystem, downlink power amplifier; Described downlink radio frequency up-conversion subsystem output is connected with the downlink power amplifier input, the input of described downlink radio frequency up-conversion subsystem is connected with downstream broadband signal digital intermediate frequency process subsystem output, and the output of described downlink power amplifier is connected with portable terminal duplexer input;
Described up radio-frequency transmitter subsystem comprises up low noise amplifier, up radio frequency down-conversion subsystem; The output of described up low noise amplifier is connected with up radio frequency down-conversion subsystem input, the input of described up low noise amplifier is connected with the output of portable terminal duplexer, and the output of described up radio frequency down-conversion subsystem is connected with the input of up broadband signal digital intermediate frequency process subsystem;
Described up radio frequency sending set subsystem comprises ascending power amplifier, up RF up-converter subsystem; The output of described up RF up-converter subsystem is connected with the ascending power amplifier input terminal, the input of described up RF up-converter subsystem is connected with the output of up broadband signal digital intermediate frequency process subsystem, and the output of described ascending power amplifier is connected with the input of alms giver's terminal duplexer.
Described repeater power subsystem provides power supply for downlink radio frequency receiver subsystem, downstream broadband signal digital intermediate frequency process subsystem, downlink radio frequency transmitter subsystem, up radio-frequency transmitter subsystem, up broadband signal digital intermediate frequency process subsystem, up radio frequency sending set subsystem.
Described monitoring repeater subsystem is monitored and is controlled downlink radio frequency receiver subsystem, downstream broadband signal digital intermediate frequency process subsystem, downlink radio frequency transmitter subsystem, up radio-frequency transmitter subsystem, up broadband signal digital intermediate frequency process subsystem, up radio frequency sending set subsystem, and carries out alarming processing etc. to unusual subsystem occurring.Aspect circuit design, the monitoring repeater subsystem can provide the monitoring and the alarm of following device parameter: power supply power-fail alarm, power failure alarm, the indication of up power output, up gain are alarmed, upward line output standing-wave ratio alarm, the alarm of up phase locked source losing lock, down output power indication, descending gain alarm, descending overpower are alarmed, descending excess temperature is alarmed, line output standing-wave ratio alarm and the alarm of descending phase locked source losing lock etc. down.Monitor And Control Subsystem can also be finished the controlled function to the following parameter of system: upward line output automatic electric-level control, line output automatic electric-level control down, carrier switch function, carrier frequency point are provided with functions such as function, carrier gains distribution.
As shown in Figure 3, downstream broadband signal digital intermediate frequency process subsystem or up broadband signal digital intermediate frequency process subsystem comprise A/D converter, broadband signal digital down-conversion subsystem, broadband signal digital up-conversion subsystem, D/A converter, and described A/D converter output is connected with the D/A converter input by broadband signal digital down-conversion subsystem, broadband signal digital up-conversion subsystem successively.
Described broadband signal digital down-conversion subsystem mainly is the wideband digital intermediate-freuqncy signal to be carried out processing such as digital mixing, extraction and digital filtering, and intermediate-freuqncy signal is moved zero intermediate frequency, the digital signal of two-forty is extracted be the baseband digital signal of low rate.The functional structure chart of broadband signal digital down-conversion subsystem among the present invention, as shown in Figure 4.Broadband signal digital down-conversion subsystem mainly is made up of frequency mixing module, NCO generation module, DDC self-adaptive decision device, multiple variable extraction filter and base band formed filter.NCO generation module in the described DDC submodule is connected with an end of frequency mixing module, and the other end of frequency mixing module is connected with the output of A/D modular converter; The output of described frequency mixing module is connected with the input of DDC self-adaptive decision device; The output of described DDC self-adaptive decision device is connected with the input of multiple variable extraction filter; The output of described multiple variable extraction filter is connected with the input of base band formed filter.
Broadband signal digital down-conversion subsystem signals handling process is as follows: broadband signal digital down-conversion subsystem receives the digital medium-frequency signal from the output of A/D modular converter, cos and sin signal that digital medium-frequency signal and NCO generation module produce are input in the frequency mixing module simultaneously, and output is through zero intermediate frequency I, Q signal after the Frequency mixing processing.Zero intermediate frequency I, the Q signal of frequency mixing module output are input in the DDC self-adaptive decision device, DDC self-adaptive decision device is according to the characteristic information of I, Q signal, as information such as data speed, processing bandwidth, adaptive selection meets data pick-up multiple and the filter coefficient that speed, bandwidth etc. require.Described multiple variable extraction filter receives from the output information of DDC self-adaptive decision device and I, Q signal, and the information that provides according to DDC self-adaptive decision device, carry out the extraction and the Filtering Processing of data, I, Q signal after output is handled through suitable filtering extraction.I, the Q signal of the output of multiple variable extraction filter, owing to select and be with the outer requirement that signal does not usually meet the digital frequency-selecting module that suppresses in the band of signal, compensation and outer inhibition of band handle in need being with the I behind the filtering extraction, Q signal, therefore, need to adopt the base band formed filter to carry out the moulding Filtering Processing, the base band formed filter is according to the demand of digital frequency-selecting module, adopt certain strategy, realization is to the compensation deals of signal in the passband, simultaneously, improve the outer inhibition ability of band, improve the performance of digital frequency-selecting module.Variable multiple decimation filter and base band formed filter can be the filter of FIR, I IR, CIC, HB filter or other form.Described broadband signal digital down-conversion subsystem can utilize programmable logic devices such as CPLD, FPGA, EPLD, DSP to realize, also can use special-purpose asic chip to realize.
Described broadband signal digital up-conversion subsystem mainly is that the base band data to the broadband carries out processing such as interpolation, digital filtering and digital mixing, signal is modulated to predetermined intermediate frequency, is the digital signal that satisfies intermediate frequency Nyquist sampling thheorem with the digital signal interpolation of low rate.The functional structure chart of broadband signal digital up-conversion subsystem among the present invention, as shown in Figure 5.Described broadband signal digital up-conversion subsystem mainly is made up of DUC self-adaptive decision device, the variable interpolation filter group of multiple and I, the multistage modulation module of Q signal.The input of the variable interpolation filter group of multiple in the output of the DUC self-adaptive decision device in the described DUC submodule and the DUC submodule is connected; I in the output of the variable interpolation filter group of multiple in the described DUC submodule and the DUC submodule, the input of the multistage modulation module of Q signal are connected.
Broadband signal digital up-conversion signal handling process is as follows: through the mixing of broadband signal digital down-conversion subsystem, extraction and filtered baseband I, Q data, be input in the DUC self-adaptive decision device in the broadband signal digital up-conversion subsystem and go.DUC self-adaptive decision device is according to characteristic informations such as the data rate of baseband I, Q data, bandwidth, and requirement such as the data rate that requires to export in conjunction with the digital intermediate frequency system, bandwidth, adaptive selection meets the interpolation of data multiple that speed, bandwidth etc. require, and according to the still multistage interpolation processing of the definite selection of multiple one-level interpolation processing, and, reasonably select the coefficient of interpolation filter etc. according to the requirement that each grade interpolation is handled.The variable interpolation filter group of received of described multiple is from the output information of DUC self-adaptive decision device and I, Q signal, and the information that provides according to DUC self-adaptive decision device, carry out the interpolation and the Filtering Processing of data, I, Q signal after output is handled through suitable interpolation filtering.The variable interpolation filter group of this multiple can be made up of the one-level interpolation filter, also can be made up of multistage interpolation filter group, generally speaking, only needs to use 1～2 grade of interpolation filter to get final product.The interpolation of the variable interpolation filter group of process multiple and the I after the Filtering Processing, Q signal are input in I, the multistage modulation module of Q signal and go, through the multistage mixing and the modulation treatment of I, the multistage modulation module of Q signal, and output digital intermediate frequency I, Q signal at a high speed.I, the multistage modulation module of Q signal generally are made up of 1～2 grade of mixed modulated module, if in the follow-up DAC submodule, have the one-level mixed modulated and handle, and then I, the multistage modulation module of Q signal can omit the processing of one-level mixed modulated.Filter in the variable interpolation filter group of described multiple can be the filter of FIR, IIR, CIC, HB filter or other form.Described broadband signal digital up-conversion subsystem can utilize programmable logic devices such as CPLD, FPGA, EPLD, DSP to realize, also can use special-purpose asic chip to realize.
In conjunction with Fig. 2, Fig. 3, Fig. 4 and Fig. 5,, comprise the transmission of downstream signal and the transmission of upward signal based on the wideband signal digital frequency-selecting method of wideband digital frequency-selecting wireless repeater system;
The transmission of described downstream signal may further comprise the steps:
(1) donor antenna receives the downstream signal from the base station, by alms giver's terminal duplexer, is input to the downlink radio frequency receiver subsystem;
(2) the descending low noise amplifier of downlink radio frequency receiver subsystem carries out processing and amplifying to the downstream signal from alms giver's terminal duplexer, and the downlink radio frequency down-conversion subsystem by the downlink radio frequency receiver subsystem, realization is to the mixing of radiofrequency signal, the down-converted of filtering, and the Low Medium Frequency signal is simulated in output; IF-FRE is generally about 50MHz～300MHz;
(3) analog if signal of downlink radio frequency receiver subsystem output is input to downstream broadband signal digital intermediate frequency process subsystem, downstream broadband signal digital intermediate frequency process subsystem carries out A/D sampling, broadband signal digital down-conversion, broadband signal digital up-conversion and D/A conversion process to analog if signal, the output analog if signal;
(4) analog if signal of downstream broadband signal digital intermediate frequency process subsystem output, be input to the downlink radio frequency transmitter subsystem, the downlink radio frequency up-conversion subsystem of downlink radio frequency transmitter subsystem is realized the mixing of analog if signal, the upconversion process of filtering, and the output radiofrequency signal, the radiofrequency signal of downlink radio frequency up-conversion subsystem output obtains further power amplification by downlink power amplifier and handles;
(5) radiofrequency signal of handling through power amplification by portable terminal duplexer and retransmitting antenna, realizes the signal of specific region is covered.
The transmission of described upward signal may further comprise the steps:
(A) retransmitting antenna receives the upward signal of overlay area, by the portable terminal duplexer, is input to up radio-frequency transmitter subsystem;
(B) the up low noise amplifier of up radio-frequency transmitter subsystem carries out processing and amplifying to the upward signal from the portable terminal duplexer, and the up radio frequency down-conversion subsystem by up radio-frequency transmitter subsystem, realization is to the mixing of radiofrequency signal, the down-converted of filtering, and the Low Medium Frequency signal is simulated in output;
(C) analog if signal of up radio-frequency transmitter subsystem output is input to up broadband signal digital intermediate frequency process subsystem, broadband signal digital intermediate frequency process subsystem carries out A/D sampling, broadband signal digital down-conversion, broadband signal digital up-conversion and D/A conversion process to analog if signal, the output analog if signal;
(D) analog if signal of up broadband signal digital intermediate frequency process subsystem output, be input to up radio frequency sending set subsystem, the up RF up-converter subsystem of up radio frequency sending set subsystem is realized the mixing of analog if signal, the upconversion process of filtering, and the output radiofrequency signal, the radiofrequency signal of up RF up-converter subsystem output obtains further power amplification by the ascending power amplifier and handles;
(E) through the radiofrequency signal of ascending power processing and amplifying, by alms giver's terminal duplexer and donor antenna, the realization subscriber signal is connected with the base station.
Broadband signal digital down-conversion signal handling process in the described step (3) is as follows: broadband signal digital down-conversion subsystem receives the digital medium-frequency signal from the output of A/D modular converter, cos and sin signal that digital medium-frequency signal and NCO generation module produce are input in the frequency mixing module simultaneously, and output is through zero intermediate frequency I, Q signal after the Frequency mixing processing.Zero intermediate frequency I, the Q signal of frequency mixing module output are input in the DDC self-adaptive decision device, DDC self-adaptive decision device is according to the characteristic information of I, Q signal, as information such as data speed, processing bandwidth, adaptive selection meets data pick-up multiple and the filter coefficient that speed, bandwidth etc. require.Described multiple variable extraction filter receives from the output information of DDC self-adaptive decision device and I, Q signal, and the information that provides according to DDC self-adaptive decision device, carry out the extraction and the Filtering Processing of data, I, Q signal after output is handled through suitable filtering extraction.I, the Q signal of the output of multiple variable extraction filter, owing to select and be with the outer requirement that signal does not usually meet the digital frequency-selecting module that suppresses in the band of signal, compensation and outer inhibition of band handle in need being with the I behind the filtering extraction, Q signal, therefore, need to adopt the base band formed filter to carry out the moulding Filtering Processing, the base band formed filter is according to the demand of digital frequency-selecting module, adopt certain strategy, realization is to the compensation deals of signal in the passband, simultaneously, improve the outer inhibition ability of band, improve the performance of digital frequency-selecting module.Variable multiple decimation filter and base band formed filter can be the filter of FIR, IIR, CIC, HB filter or other form.Described broadband signal digital down-conversion subsystem can utilize programmable logic devices such as CPLD, FPGA, EPLD, DSP to realize, also can use special-purpose asic chip to realize.
Broadband signal digital up-conversion signal handling process in the described step (3) is as follows: mixing, extraction and filtered baseband I, Q data through broadband signal digital down-conversion subsystem are input in the DUC self-adaptive decision device in the broadband signal digital up-conversion subsystem and go.DUC self-adaptive decision device is according to characteristic informations such as the data rate of baseband I, Q data, bandwidth, and requirement such as the data rate that requires to export in conjunction with the digital intermediate frequency system, bandwidth, adaptive selection meets the interpolation of data multiple that speed, bandwidth etc. require, and according to the still multistage interpolation processing of the definite selection of multiple one-level interpolation processing, and, reasonably select the coefficient of interpolation filter etc. according to the requirement that each grade interpolation is handled.The variable interpolation filter group of received of described multiple is from the output information of DUC self-adaptive decision device and I, Q signal, and the information that provides according to DUC self-adaptive decision device, carry out the interpolation and the Filtering Processing of data, I, Q signal after output is handled through suitable interpolation filtering.The variable interpolation filter group of this multiple can be made up of the one-level interpolation filter, also can be made up of multistage interpolation filter group, generally speaking, only needs to use 1～2 grade of interpolation filter to get final product.The interpolation of the variable interpolation filter group of process multiple and the I after the Filtering Processing, Q signal are input in I, the multistage modulation module of Q signal and go, through the multistage mixing and the modulation treatment of I, the multistage modulation module of Q signal, and output digital intermediate frequency I, Q signal at a high speed.I, the multistage modulation module of Q signal generally are made up of 1～2 grade of mixed modulated module, if in the follow-up DAC submodule, have the one-level mixed modulated and handle, and then I, the multistage modulation module of Q signal can omit the processing of one-level mixed modulated.Filter in the variable interpolation filter group of described multiple can be the filter of FIR, IIR, CIC, HB filter or other form.Described broadband signal digital up-conversion subsystem can utilize programmable logic devices such as CPLD, FPGA, EPLD, DSP to realize, also can use special-purpose asic chip to realize.
The broadband signal digital down-converted is identical with broadband signal digital upconversion process mode with the middle broadband signal digital down-converted of broadband signal digital upconversion process mode and step (3) in the above-mentioned steps (C).
Described embodiment is a preferred implementation of the present invention; but embodiments of the present invention are not limited by the examples; other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (10)
1, wideband digital frequency-selecting wireless repeater system, comprise up link, down link, repeater power subsystem and monitoring repeater subsystem, described up link, down link comprises alms giver's terminal duplexer, the portable terminal duplexer, donor antenna, retransmitting antenna, it is characterized in that: described down link also comprises the downlink radio frequency receiver subsystem, downstream broadband signal digital intermediate frequency process subsystem, downlink radio frequency transmitter subsystem, described donor antenna output are successively by alms giver's terminal duplexer, the downlink radio frequency receiver subsystem, downstream broadband signal digital intermediate frequency process subsystem, the downlink radio frequency transmitter subsystem, the portable terminal duplexer is connected with the retransmitting antenna input; Described up link also comprises up radio-frequency transmitter subsystem, up broadband signal digital intermediate frequency process subsystem, up radio frequency sending set subsystem, and described retransmitting antenna output is connected with the donor antenna input by portable terminal duplexer, up radio-frequency transmitter subsystem, up broadband signal digital intermediate frequency process subsystem, up radio frequency sending set subsystem, alms giver's terminal duplexer successively; Described repeater power subsystem and monitoring repeater subsystem are connected with downlink radio frequency receiver subsystem, downstream broadband signal digital intermediate frequency process subsystem, downlink radio frequency transmitter subsystem, up radio-frequency transmitter subsystem, up broadband signal digital intermediate frequency process subsystem, up radio frequency sending set subsystem respectively simultaneously.
2, wideband digital frequency-selecting wireless repeater system according to claim 1 is characterized in that: described downlink radio frequency receiver subsystem comprises descending low noise amplifier, downlink radio frequency down-conversion subsystem; The output of described descending low noise amplifier is connected with downlink radio frequency down-conversion subsystem input, described descending low noise amplifier input is connected with the output of alms giver's terminal duplexer, and described downlink radio frequency down-conversion subsystem output is connected with the input of downstream broadband signal digital intermediate frequency process subsystem;
Described downlink radio frequency transmitter subsystem comprises downlink radio frequency up-conversion subsystem, downlink power amplifier; Described downlink radio frequency up-conversion subsystem output is connected with the downlink power amplifier input, the input of described downlink radio frequency up-conversion subsystem is connected with downstream broadband signal digital intermediate frequency process subsystem output, and the output of described downlink power amplifier is connected with portable terminal duplexer input;
Described up radio-frequency transmitter subsystem comprises up low noise amplifier, up radio frequency down-conversion subsystem; The output of described up low noise amplifier is connected with up radio frequency down-conversion subsystem input, the input of described up low noise amplifier is connected with the output of portable terminal duplexer, and the output of described up radio frequency down-conversion subsystem is connected with the input of up broadband signal digital intermediate frequency process subsystem;
Described up radio frequency sending set subsystem comprises ascending power amplifier, up RF up-converter subsystem; The output of described up RF up-converter subsystem is connected with the ascending power amplifier input terminal, the input of described up RF up-converter subsystem is connected with the output of up broadband signal digital intermediate frequency process subsystem, and the output of described ascending power amplifier is connected with the input of alms giver's terminal duplexer.
3, according to claim 1 or 2 each described wideband digital frequency-selecting wireless repeater systems, it is characterized in that: described downstream broadband signal digital intermediate frequency process subsystem and up broadband signal digital intermediate frequency process subsystem comprise A/D converter, broadband signal digital down-conversion subsystem, broadband signal digital up-conversion subsystem, D/A converter respectively, and described A/D converter output is connected with the D/A converter input by broadband signal digital down-conversion subsystem, broadband signal digital up-conversion subsystem successively.
4, wideband digital frequency-selecting wireless repeater system according to claim 3 is characterized in that: described broadband signal digital down-conversion subsystem comprises frequency mixing module, NCO generation module, DDC self-adaptive decision device, multiple variable extraction filter and base band formed filter; Described NCO generation module is connected with an end of frequency mixing module, and the other end of frequency mixing module is connected with the output of A/D modular converter; The output of described frequency mixing module is connected with the input of DDC self-adaptive decision device; The output of described DDC self-adaptive decision device is connected with the input of multiple variable extraction filter; The output of described multiple variable extraction filter is connected with the input of base band formed filter;
Described broadband signal digital up-conversion subsystem comprises DUC self-adaptive decision device, the variable interpolation filter group of multiple and I, the multistage modulation module of Q signal; The input of the variable interpolation filter group of multiple in the output of the DUC self-adaptive decision device in the described broadband signal digital up-conversion subsystem and the DUC submodule is connected; I in the output of the variable interpolation filter group of multiple in the described DUC submodule and the DUC submodule, the input of the multistage modulation module of Q signal are connected.
5, based on the wideband signal digital frequency-selecting method of the described wideband digital frequency-selecting wireless repeater system of claim 4, it is characterized in that: comprise the transmission of downstream signal and the transmission of upward signal; Wherein, the transmission of described downstream signal may further comprise the steps:
(1) donor antenna receives the downstream signal from the base station, by alms giver's terminal duplexer, is input to the downlink radio frequency receiver subsystem;
(2) the descending low noise amplifier of downlink radio frequency receiver subsystem carries out processing and amplifying to the downstream signal from alms giver's terminal duplexer, and the downlink radio frequency down-conversion subsystem by the downlink radio frequency receiver subsystem, realization is to the mixing of radiofrequency signal, the down-converted of filtering, and the Low Medium Frequency signal is simulated in output;
(3) analog if signal of downlink radio frequency receiver subsystem output is input to downstream broadband signal digital intermediate frequency process subsystem, broadband signal digital intermediate frequency process subsystem carries out A/D sampling, broadband signal digital down-conversion, broadband signal digital up-conversion and D/A conversion process to analog if signal, the output analog if signal;
(4) analog if signal of downstream broadband signal digital intermediate frequency process subsystem output, be input to the downlink radio frequency transmitter subsystem, the downlink radio frequency up-conversion subsystem of downlink radio frequency transmitter subsystem is realized the mixing of analog if signal, the upconversion process of filtering, and the output radiofrequency signal, the radiofrequency signal of downlink radio frequency up-conversion subsystem output obtains further power amplification by downlink power amplifier and handles;
(5) radiofrequency signal of handling through power amplification by portable terminal duplexer and retransmitting antenna, realizes the signal of specific region is covered;
The transmission of described upward signal may further comprise the steps:
(A) retransmitting antenna receives the upward signal of overlay area, by the portable terminal duplexer, is input to up radio-frequency transmitter subsystem;
(B) the up low noise amplifier of up radio-frequency transmitter subsystem carries out processing and amplifying to the upward signal from the portable terminal duplexer, and the up radio frequency down-conversion subsystem by up radio-frequency transmitter subsystem, realization is to the mixing of radiofrequency signal, the down-converted of filtering, and the Low Medium Frequency signal is simulated in output;
(C) analog if signal of up radio-frequency transmitter subsystem output is input to up broadband signal digital intermediate frequency process subsystem, broadband signal digital intermediate frequency process subsystem carries out A/D sampling, broadband signal digital down-conversion, broadband signal digital up-conversion and D/A conversion process to analog if signal, the output analog if signal;
(D) analog if signal of up broadband signal digital intermediate frequency process subsystem output, be input to up radio frequency sending set subsystem, the up RF up-converter subsystem of up radio frequency sending set subsystem is realized the mixing of analog if signal, the upconversion process of filtering, and the output radiofrequency signal, the radiofrequency signal of up RF up-converter subsystem output obtains further power amplification by the ascending power amplifier and handles;
(E) through the radiofrequency signal of ascending power processing and amplifying, by alms giver's terminal duplexer and donor antenna, the realization subscriber signal is connected with the base station.
6, wideband signal digital frequency-selecting method according to claim 5, it is characterized in that: described step (3) or (C) in broadband signal digital down-conversion signal handling process as follows: broadband signal digital down-conversion subsystem receives the digital medium-frequency signal from the output of A/D modular converter, cos and sin signal that digital medium-frequency signal and NCO generation module produce are input in the frequency mixing module simultaneously, and output is through zero intermediate frequency I, Q signal after the Frequency mixing processing; Zero intermediate frequency I, the Q signal of frequency mixing module output are input in the DDC self-adaptive decision device, DDC self-adaptive decision device is according to the characteristic information of I, Q signal, described characteristic information comprises data rate, handles bandwidth, data pick-up multiple and the filter coefficient of select to meet data rate adaptively, handling bandwidth requirement; Described multiple variable extraction filter receives from the output information of DDC self-adaptive decision device and I, Q signal, and according to the information that DDC self-adaptive decision device provides, carries out the extraction and the Filtering Processing of data, I, Q signal after output is handled through filtering extraction; The outer inhibition of compensation and band handled output baseband I, Q signal in I, the Q signal of base band formed filter after to filtering extraction was with.
7, wideband signal digital frequency-selecting method according to claim 5, it is characterized in that: described step (3) or (C) in broadband signal digital up-conversion signal handling process as follows: mixing, extraction and filtered baseband I, Q signal through broadband signal digital down-conversion subsystem are input in the DUC self-adaptive decision device in the broadband signal digital up-conversion subsystem and go; DUC self-adaptive decision device is according to the characteristic information of baseband I, Q data, described characteristic information comprises data rate, handles bandwidth, select to meet the interpolation of data multiple of data rate, processing bandwidth requirement adaptively, and according to the still multistage interpolation processing of the definite selection of multiple one-level interpolation processing, and, reasonably select the coefficient of interpolation filter according to the requirement that each grade interpolation is handled; The variable interpolation filter group of received of described multiple is from the output information of DUC self-adaptive decision device and I, Q signal, and the information that provides according to DUC self-adaptive decision device, carry out the interpolation and the Filtering Processing of data, I, Q signal after output is handled through suitable interpolation filtering; Interpolation and the I after the Filtering Processing, Q signal through the variable interpolation filter group of multiple are input in I, the multistage modulation module of Q signal, through the multistage mixing and the modulation treatment of I, the multistage modulation module of Q signal, and output digital intermediate frequency I, Q signal at a high speed.
8, wideband signal digital frequency-selecting method according to claim 6 is characterized in that: the filter that described variable multiple decimation filter and base band formed filter adopt comprises FIR, IIR, CIC, HB filter; Described broadband signal digital down-conversion subsystem adopts programmable logic device to comprise that CPLD, FPGA, EPLD, DSP realize, perhaps adopt special-purpose asic chip to realize.
9, wideband signal digital frequency-selecting method according to claim 7 is characterized in that: the variable interpolation filter group of described multiple is made up of the one-level interpolation filter, perhaps is made up of multistage interpolation filter group; I, the multistage modulation module of Q signal are made up of 1～2 grade of mixed modulated module.
10, wideband signal digital frequency-selecting method according to claim 7 is characterized in that: the filter that the filter in the variable interpolation filter group of described multiple adopts comprises FIR, IIR, CIC, HB filter; Described broadband signal digital up-conversion subsystem adopts programmable logic device to comprise that CPLD, FPGA, EPLD, DSP realize, perhaps adopt special-purpose asic chip to realize.
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