CN101378263A - Multi-carrier digital receiver based on digital intermediate frequency and multi-carrier digital receive method - Google Patents
Multi-carrier digital receiver based on digital intermediate frequency and multi-carrier digital receive method Download PDFInfo
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Abstract
The invention discloses a multi-carrier digital receiver based on digital medium frequency, which comprises a radio frequency receiving subsystem, an A/D converter, a digital baseband signal processing subsystem, an automatic frequency control subsystem, and a multi-carrier digital down-conversion subsystem; wherein, the output terminal of the radio frequency receiving subsystem is connected with the input terminal of the digital baseband signal processing subsystem sequentially by the A/D converter and the multi-carrier digital down-conversion subsystem, the input terminal of the automatic frequency control subsystem is connected with the output terminal of the digital baseband signal processing subsystem, and the output terminal of the automatic frequency control subsystem is connected with the input terminal of the radio frequency receiving subsystem. The invention establishes the multi-carrier digital down-conversion subsystem by adopting the digital medium frequency technology and utilizing the multi-carrier signal processing method, thus avoiding the limitation of the traditional digital down-conversion subsystem and realizing the multi-carrier digital receiver system.
Description
Technical field
The present invention relates to digital receiver system, relate in particular to multi-carrier digital receiver and multi-carrier digital method of reseptance based on digital intermediate frequency.
Background technology
Traditional digital receiver system based on digital if technology (as shown in Figure 1) has generally comprised radio frequency receiving subsystem, Digital IF Processing subsystem, base band signal process subsystem and background process subsystem etc.The radio frequency receiving subsystem is realized the conversion process of signal from RF to IF; The Digital IF Processing subsystem is realized the data processing of Simulation with I F to digital baseband I, Q, the baseband digital signal processing subsystem, finish synchronously and demodulation process, background process realizes the conversion of communication interface control, interface level and with the interconnection of extraneous computer etc.Wherein, radio frequency amplifies and the down-conversion subsystem generally adopts the superhet or the design of zero intermediate frequency, and the harmonic wave of superhet system and spuious inhibition are difficult to be realized, and DC (direct current) skew appears in zero intermediate frequency formula system easily.Present receiver system, owing to need more analog circuit, the system index consistency is bad, the debugging more complicated, and, can't proofread and correct the local-oscillator leakage that causes owing to I, Q signal phase place, amplitude imbalance, also reduced the receptivity of receiver.
At present, common receiver mainly is the single carrier digital receiver system, can only receive processing to single-carrier signal.Along with the development of mobile communication, the tracking exchage amount sharply increases, and operator has to that the mobile communication system of various standards is carried out dilatation and handles, and to satisfy the user's communications demand, causes operation cost to increase.Communication system volume expansion of today is handled, and all is to adopt multi-transceiver technology, and this just requires the corresponding mobile communication products also to have the multicarrier disposal ability.Therefore, digital receiver should be able to be realized the processing to multi-carrier signal, to meet application demand from now on.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, multi-carrier digital receiver and multi-carrier digital method of reseptance based on digital intermediate frequency are provided, system of the present invention can not only satisfy digital receiver the reception of multi-carrier signal is handled, and improved the reception dynamic range of receiver greatly, spuious outside the good restraining band, elimination local-oscillator leakage effectively reduces the frequency shift (FS) of receiver, effectively improves the receptivity of receiver.
Purpose of the present invention is achieved through the following technical solutions: a kind of multi-carrier digital receiver based on digital intermediate frequency, comprise the radio frequency receiving subsystem, A/D converter, the digital baseband signal processing subsystem, the automatic frequency control subsystem, multi-carrier digital down-conversion subsystem, the output of described radio frequency receiving subsystem passes through A/D converter successively, multi-carrier digital down-conversion subsystem is connected with the input of digital baseband signal processing subsystem, the input of described automatic frequency control subsystem is connected with the output of digital baseband signal processing subsystem, and the output of described automatic frequency control subsystem is connected with the input of radio frequency receiving subsystem.Also comprise Clock Subsystem, microchip control subsystem, the output of described Clock Subsystem, microchip control subsystem is connected with another input of digital baseband signal processing subsystem with radio frequency receiving subsystem, A/D converter, multi-carrier digital down-conversion subsystem respectively.
Described multi-carrier digital down-conversion subsystem comprises that A/D sampling and AGC control module, single channel NCO generation module, first order quadrature modulation processing module, first order decimation filter group, multichannel NCO generation module, second level complex modulation processing module, second level decimation filter group, variable gain adjustment module, local oscillator suppress module, Data Format Transform module, data-interface control module, DDC system total control module; Described A/D sampling is connected with the input of data-interface control module by first order quadrature modulation processing module, first order decimation filter group, second level complex modulation processing module, second level decimation filter group, variable gain adjustment module, local oscillator inhibition module, Data Format Transform module successively with AGC control module output; The output of described single channel NCO generation module is connected with the input of first order quadrature modulation processing module; The output of described multichannel NCO generation module is connected with the input of second level complex modulation processing module; The output of described DDC system total control module suppresses module with single channel NCO generation module, multichannel NCO generation module, variable gain adjustment module, local oscillator simultaneously, the Data Format Transform module is connected with another input of data-interface control module.
Described A/D sampling and AGC control module comprise AGC control module, A/D modular converter and control treatment module, the output of described AGC control module is connected with the control treatment module input by the A/D modular converter, and described control treatment module output connects the input of first order quadrature modulation processing module input and AGC control module respectively.
Described second level complex modulation processing module comprises a plurality of modulation accumulator module, and data time sequence is adjusted processing module, and described a plurality of modulation accumulator module are adjusted processing module with data time sequence simultaneously and are connected; Described modulation accumulator module comprises NCO signal lag processing module, I, Q signal delay process module behind the filtering extraction, multiplier, I, Q signal delay process module after the mixing, accumulator and add up back I, Q signal delay process module; The NCO signal lag processing module of described multichannel NCO generation module and a plurality of modulation accumulator module, multiplier, I, Q signal delay process module after the mixing, accumulator is connected successively with the back I that adds up, Q signal delay process module; I, Q signal delay process module behind the filtering extraction of described first order decimation filter group and a plurality of modulation accumulator module, multiplier, I, Q signal delay process module after the mixing, accumulator, I, Q signal delay process module after adding up, data time sequence are adjusted processing module and are connected successively.
Described first order decimation filter group or second level decimation filter group are made up of one, two or three decimation filters respectively; Described decimation filter is FIR, IIR, CIC or partly is with decimation filter; Any one realization in described multi-carrier digital down-conversion subsystem CPLD, EPLD, FPGA, DSP programmable logic device or the asic chip.
Described radio frequency receiving subsystem comprises anti-band pass filter, simulation ATT, amplifier, frequency mixer, local oscillator LO and the anti-repeatedly filter that mixes of mixing repeatedly, described anti-mixing being connected with the anti-input that mixes the filter that changes by simulation ATT, amplifier, frequency mixer successively of the band pass filter that changes, the output of described local oscillator LO is connected with the input of frequency mixer.
Multi-carrier digital method of reseptance based on the multi-carrier digital receiver of digital intermediate frequency may further comprise the steps:
(1) the radio frequency receiving subsystem is handled the received radiofrequency signal of antenna, changes radiofrequency signal into analog if signal and outputs to A/D converter;
(2) A/D converter carries out analog-to-digital conversion process with the analog if signal that receives, and the digital medium-frequency signal of output two-forty is to the Digital Down Convert subsystem;
(3) multi-carrier digital down-conversion subsystem carries out Digital Down Convert processing and carrier separation to digital medium-frequency signal, and the low speed baseband signal of output multicarrier is to the base band signal process subsystem;
(4) the base band signal process subsystem to the low speed baseband signal that receives comprise synchronously, the processing of channel-decoding, searching carrier processing and channel estimating, finish the reception of multiple carrier digital signal.
Described step (3) multi-carrier digital down-conversion subsystem carries out Digital Down Convert processing and carrier separation to digital medium-frequency signal, and the low speed baseband signal of output multicarrier may further comprise the steps to the base band signal process subsystem:
(a) the AGC control module will receive analog if signal and be sent to the A/D modular converter, the A/D modular converter carries out analog-to-digital conversion and forms digital medium-frequency signal, control module is according to the characteristic of digital medium-frequency signal, decision-making of output feedback and control information realize the automatic AGC control to the A/D chip to the AGC control module;
(b) digital medium-frequency signal of A/D sampling and the output of AGC control module is input to first order quadrature modulation processing module, carry out the mixed modulated processing with the cos and the sin signal of the output of single channel NCO generation module, the digital signal of output zero intermediate frequency, the digital signal of zero intermediate frequency enters into first order decimation filter group and carries out data pick-up and Filtering Processing;
(c) carry out data behind the filtering extraction through first order decimation filter group, the cos of a plurality of different frequencies that produce with multichannel NCO generation module and sin signal are input to second level complex modulation processing module to carry out mixed modulated and handles, and forms multicarrier I, Q signal; Multicarrier I, Q signal carry out further data pick-up and Filtering Processing by second level decimation filter group, multicarrier baseband I, the Q data of output low speed;
(d) through the signal process variable gain adjustment module after the two-stage modulation, the gain of each carrier wave can independently be adjusted accordingly, I, Q signal that the gain of output compliance with system requires;
(e) signal of variable gain adjustment module output carries out the inhibition of direct current local-oscillator leakage and carrier leak by local oscillator inhibition processing module, pass through the form of Data Format Transform module controls output signal then, at last again by the control data interface module, output is parallel, I, the Q data of serial or interlace mode.
The form of described step (e) output signal comprises the complement of two's two's complement, true form, offset code.
The present invention compared with prior art has following advantage and beneficial effect:
1, the present invention adopts digital if technology, utilizes the multi-carrier signal processing method, makes up multi-carrier digital down-conversion subsystem, has avoided the restriction of conventional digital down-conversion subsystem, has realized the digital receiver system of multicarrier.
2, receiver of the present invention can be realized the automatic frequency controlled function in conjunction with multi-carrier digital down-conversion subsystem and radio frequency receiving subsystem, deviation according to digital signal institute calculated rate, then by adjusting the frequency deviation of RF, realize the automatic frequency control of receiver, effectively reduce the frequency shift (FS) of receiver, improve the receiving sensitivity of receiver.
3, the present invention reduces the requirement to front-end A/D device, carries out AGC control in Digital Down Convert is handled, and has improved the dynamic range of A/D, has improved the reception dynamic range of receiver greatly.
4, the Digital Down Convert subsystem is easy to utilize programmable logic device to realize, can set up the if system of multiple communication standard, forms the digital receiver of difference in functionality, standard and interface.
5, the present invention helps adopting and realizes such as programmable logic devices such as FPGA, CPLD, EPLD, DSP, can in programmable logic device, realize processing such as high performance digital filtering, local oscillator inhibition, the good restraining band is spuious outward and eliminate local-oscillator leakage, improves the performance of receiver greatly.
Description of drawings
Fig. 1 is based on the digital receiver system theory diagram of digital if technology;
Fig. 2 is the structure principle chart of multi-carrier digital receiver of the present invention system;
Fig. 3 is the theory diagram of the multi-carrier digital down-conversion subsystem of multi-carrier digital receiver of the present invention system;
Fig. 4 is the second level complex modulation processing module structured flowchart of the multi-carrier digital down-conversion subsystem of multi-carrier digital receiver of the present invention system;
Fig. 5 is the structure chart of the radio frequency receiving subsystem of multi-carrier digital receiver of the present invention system;
Fig. 6 is a N carrier wave NCO serial output mode schematic diagram in the multi-carrier digital down conversion system;
Fig. 7 is the parallel output mode schematic diagram of N carrier wave NCO in the multi-carrier digital down conversion system;
Fig. 8 is a N carrier wave NCO burst mode NCO output timing schematic diagram in the multi-carrier digital down conversion system;
Fig. 9 is the parallel output mode schematic diagram of N carrier wave in the multi-carrier digital down conversion system;
Figure 10 is the parallel output mode schematic diagram that interweaves of N carrier wave in the multi-carrier digital down conversion system;
Figure 11 is the output mode schematic diagram that interweaves of N carrier wave serial in the multi-carrier digital down conversion system;
Figure 12 is a N carrier burst pattern output timing schematic diagram in the multi-carrier digital down conversion system.
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, a kind of multi-carrier digital receiver of the present invention based on digital intermediate frequency, comprise the radio frequency receiving subsystem, A/D converter, the digital baseband signal processing subsystem, the automatic frequency control subsystem, multi-carrier digital down-conversion subsystem, the output of described radio frequency receiving subsystem passes through A/D converter successively, multi-carrier digital down-conversion subsystem is connected with the input of digital baseband signal processing subsystem, the input of described automatic frequency control subsystem is connected with the output of digital baseband signal processing subsystem, and the output of described automatic frequency control subsystem is connected with the input of radio frequency receiving subsystem.Also comprise Clock Subsystem, microchip control subsystem, the output of described Clock Subsystem, microchip control subsystem is connected with another input of digital baseband signal processing subsystem with radio frequency receiving subsystem, A/D converter, multi-carrier digital down-conversion subsystem respectively.
Described A/D converter is based on one of Primary Component in the multi-carrier receiver system of digital if technology, realizes the analog-to-digital conversion process to analog if signal, the digital medium-frequency signal of output two-forty.Because Digital IF Processing having relatively high expectations to A/D converter, the A/D device that generally needs high speed, wide dynamic range is so the present invention is in order to reduce the requirement to front-end A/D device, in the multi-carrier digital down-converted, carry out AGC control, improved the dynamic range of A/D.
Described base band signal process subsystem receives baseband I, the Q data of the Digital Down Convert subsystem output of handling from multi-carrier signal, to signal carry out synchronously, processing such as channel-decoding, channel estimating and searching carrier.
Described Clock Subsystem provides reference clock signal for each subsystem and the module in the whole system, and the Clock management of responsible digital receiver system and distribution, processing such as the frequency division of realization clock, frequency multiplication;
Described microchip control subsystem is responsible for the monitoring and the control of whole digital receiver system, can monitor and alarming processing by each submodule of system bus and receiver system.If a certain subsystem or operation irregularity appears in submodule, to carry out system reset and handle and carry out alarm report and handle, the microchip control subsystem also program of whole system is downloaded and is upgraded, as the download of FPGA, DSP program;
Described automatic frequency control subsystem mainly realizes the automatic frequency correction of whole receiver system, frequency departure with the appearance of adjusting receiver received signal and input signal, need be according to received base band speed certificate, the deviation of calculated rate is adjusted the deviation of RF by regulation voltage level.In the automatic frequency, the control voltage of selected crystal oscillator needs very stable, anti-interference.Otherwise the frequency instability that can cause crystal oscillator.
Multi-carrier digital method of reseptance based on the multi-carrier digital receiver of digital intermediate frequency may further comprise the steps:
(1) the radio frequency receiving subsystem is handled the received radiofrequency signal of antenna, changes radiofrequency signal into analog if signal and outputs to A/D converter;
(2) A/D converter carries out analog-to-digital conversion process with the analog if signal that receives, and the digital medium-frequency signal of output two-forty is to the Digital Down Convert subsystem;
(3) multi-carrier digital down-conversion subsystem carries out Digital Down Convert processing and carrier separation to digital medium-frequency signal, and the low speed baseband signal of output multicarrier is to the base band signal process subsystem;
(4) the base band signal process subsystem to the low speed baseband signal that receives comprise synchronously, the processing of channel-decoding, searching carrier processing and channel estimating, finish the reception of multiple carrier digital signal.
As shown in Figure 3, the multi-carrier digital down conversion system of multi-carrier digital receiver of the present invention system comprises A/D sampling and AGC control module, single channel NCO generation module, first order quadrature modulation processing module, first order decimation filter group, multichannel NCO generation module, second level complex modulation processing module, second level decimation filter group, variable gain adjustment module, local oscillator inhibition module, Data Format Transform module, data-interface control module, DDC system total control module; Described A/D sampling is connected with the input of data-interface control module by first order quadrature modulation processing module, first order decimation filter group, second level complex modulation processing module, second level decimation filter group, variable gain adjustment module, local oscillator inhibition module, Data Format Transform module successively with AGC control module output; The output of described single channel NCO generation module is connected with the input of first order quadrature modulation processing module; The output of described multichannel NCO generation module is connected with the input of second level complex modulation processing module; The output of described DDC system total control module is connected with another input that single channel NCO generation module, multichannel NCO generation module, variable gain adjustment module, local oscillator suppress module, Data Format Transform module, data-interface control module simultaneously.
A/D sampling and AGC control module in the described multi-carrier digital down-conversion subsystem comprise AGC control module, A/D modular converter and control treatment module, the output of described AGC control module is connected with the control treatment module input by the A/D modular converter, and described control treatment module output connects the input of first order quadrature modulation processing module input and AGC control module respectively.AGC control module and control treatment module are formed feedback control system; decision-making and control signal that the AGC control module is sent according to control treatment module; characteristic according to A/D; realization is to the decay and the processing and amplifying of input signal; when protecting A/D converter, improve the dynamic range of A/D modular converter to play.Wherein control treatment module is finished outside the control signal function of exporting to AGC control, also must possess the following function: the low speed signal after the A/D conversion is converted to the high speed signal that is fit to first order quadrature modulation processing module demand, or the high speed signal after the A/D conversion is converted to the low speed signal that is fit to first order quadrature modulation processing module demand, or the parallel signal after the A/D conversion is converted to the serial signal that is fit to first order quadrature modulation processing module demand, or the serial signal after the A/D conversion is converted to the parallel signal that is fit to first order quadrature modulation processing module demand.
Described first order quadrature modulation processing module is mixing and the modulation treatment to carrying out the first order from the digital medium-frequency signal of A/D conversion and AGC control module and single carrier cos that single channel NCO generation module is generated and sin signal mainly, and exporting with 0MHz is the digital signal of center frequency point.
Described single channel NCO generation module function is cos and the sin signal that produces single carrier, and concrete frequency can be provided with by DDC system total control module according to designing requirement.
Described multichannel NCO generation module mainly realizes generating the digital sin and the cos signal of multicarrier, for second level complex modulation processing module provides a plurality of local oscillator reference signals.The frequency of each carrier wave can be provided with separately by DDC system total control module according to designing requirement.Multichannel NCO generation module can be exported the local oscillation signal of multiple sequential, as N the carrier wave NCO serial output mode of Fig. 6, the parallel output mode of N carrier wave NCO of Fig. 7 and N the carrier wave NCO burst mode NCO output timing of Fig. 8 etc.
In the multi-carrier digital down conversion system,, need to adopt data pick-up to handle, but data pick-up can cause mixing repeatedly of signal spectrum, need carry out filtering in order to reduce the transmission rate of A/D sampling back data.The extraction of corresponding high multiple is handled, and in order to reduce the difficulty of Design of Filter, saves device resource, generally will adopt multistage decimation filter cascade to realize.First order decimation filter group in the system and second level decimation filter group generally all are made up of one or two decimation filter, in particular cases, can adopt three decimation filters to constitute the decimation filter group.Wherein, decimation filter can be for FIR, IIR and CIC, partly be with decimation filter etc.First order extraction needs to realize 16 haplotype datas extraction processing as system, can adopt 4 times of CIC extractions and FIR to extract 4 times and realize, also can adopt 2 times of half-band filter extractions, 2 times of CIC extractions and FIR extraction to realize for 4 times.
Multi-carrier digital down-conversion subsystem in the present invention carries out gain-adjusted and control to the signal of output after the modulation, to satisfy in the system design control requirement to signal input, output gain.Described variable gain adjustment module has been opened some user interfaces, so that the user can revise system gain arbitrarily according to requirement of system design, and specifically can be by any adjusting of DDC system total control module realization to gain.
Described Data Format Transform module is mainly according to the follow-up system requirement, and the form of dateout is carried out certain adjustment and conversion, can export the complement of two's two's complement, true form, offset code, heuristicimal code etc.Concrete dateout call format is controlled and is realized by DDC system total control module.
Described data-interface control module function mainly is baseband I, the Q signal that output meets the different sequential rules of subsequent request.DDC system total control module can be provided with the sequential requirement of output, realize the data of the following pattern of output by the data-interface control module: as N the carrier wave of the parallel output mode of N the carrier wave of Fig. 9, Figure 10 interweave N the carrier burst pattern output timing of output mode (wherein the highest significant position of MSB (MostSignificant Bit) characterization data, the least significant bit of LSB (Least Significant Bit) characterization data) and Figure 12 of N the carrier wave serial of output mode, Figure 11 that interweave that walk abreast.
Described DDC system total control module suppresses module, data format conversion module, data-interface control module with single channel NCO generation module, multichannel NCO generation module, variable gain adjustment module, local oscillator respectively and is connected.Realization is to the setting of single channel NCO generation module and multichannel NCO generation module output frequency; Control variable gain adjustment module makes the gain of each carrier wave meet design requirement; According to the systematic function requirement, realize that reasonably local oscillator suppresses to handle.At last, the data format and the data time sequence of the requirement of output compliance with system.
Described local oscillator suppresses module in the present invention, suppresses to realize offsetting in the down-converted, because direct current signal that Design Treatment etc. are introduced and carrier leak signal, so improved multi-carrier digital down conversion system performance.In Digital Down Convert is handled, unavoidably can introduce direct current signal, can adopt " symmetry rounds off " processing method to suppress direct current leakage, also can adopt the inhibition of the method realization of DC filtering to direct current, can also adopt other method to carry out the inhibition of direct current, as ask for the average of signal, signal is compensated processing.And in the multicarrier down conversion system, the carrier leak of each frequency correspondence also can be brought bigger influence to systematic function, so, need suppress to handle to the carrier leak signal, to reduce the interference of carrier leak to other carrier waves.Concrete inhibition requirement can realize the adjusting and the control of any performance according to the systematic function requirement by DDC system total control module.
As shown in Figure 4, the second level complex modulation processing module of the multi-carrier digital down conversion system of multi-carrier digital receiver of the present invention system, comprise a plurality of modulation accumulator module, data time sequence is adjusted processing module, and described a plurality of modulation accumulator module are adjusted processing module with data time sequence simultaneously and are connected; Described modulation accumulator module comprises I, Q signal delay process module, accumulator and add up back I, Q signal delay process module after I behind NCO signal lag processing module, the filtering extraction, Q signal delay process module, multiplier, the mixing; I, Q signal delay process module, accumulator and the back I that adds up, Q signal delay process module are connected successively after the NCO signal lag processing module of described multichannel NCO generation module and a plurality of modulation accumulator module, multiplier, the mixing; Behind the filtering extraction of described first order decimation filter group and a plurality of modulation accumulator module after I, Q signal delay process module, multiplier, the mixing I, Q signal delay process module, accumulator, the back I that adds up, Q signal delay process module, data time sequence adjust processing module and be connected successively.
In conjunction with Fig. 3, shown in Figure 4, what multi-carrier digital down conversion system of the present invention was realized carries out Digital Down Convert processing and carrier separation to digital medium-frequency signal, and the low speed baseband signal of output multicarrier may further comprise the steps to the base band signal process subsystem:
(a) the AGC control module will receive analog if signal and be sent to the A/D modular converter, the A/D modular converter carries out analog-to-digital conversion and forms digital medium-frequency signal, control module is according to the characteristic of digital medium-frequency signal, decision-making of output feedback and control information realize the automatic AGC control to the A/D chip to the AGC control module;
(b) digital medium-frequency signal of A/D sampling and the output of AGC control module is input to first order quadrature modulation processing module, carry out the mixed modulated processing with the cos and the sin signal of the output of single channel NCO generation module, the digital signal of output zero intermediate frequency, the digital signal of zero intermediate frequency enters into first order decimation filter group and carries out data pick-up and Filtering Processing;
(c) carry out data behind the filtering extraction through first order decimation filter group, the cos of a plurality of different frequencies that produce with multichannel NCO generation module and sin signal are input to second level complex modulation processing module to carry out mixed modulated and handles, and forms multicarrier I, Q signal; Multicarrier I, Q signal carry out further data pick-up and Filtering Processing by second level decimation filter group, multicarrier baseband I, the Q data of output low speed;
(d) through the signal process variable gain adjustment module after the two-stage modulation, the gain of each carrier wave can independently be adjusted accordingly, I, Q signal that the gain of output compliance with system requires;
(e) signal of variable gain adjustment module output carries out the inhibition of direct current local-oscillator leakage and carrier leak by local oscillator inhibition processing module, pass through the form of Data Format Transform module controls output signal then, at last again by the control data interface module, output is parallel, I, the Q data of serial or interlace mode.
As shown in Figure 5, the radio frequency receiving subsystem that the present invention is based on the multi-carrier digital receiver of digital intermediate frequency comprises anti-band pass filter, simulation ATT, amplifier, frequency mixer, local oscillator LO and the anti-repeatedly filter that mixes of mixing repeatedly, described resisting mixed passing through, simulate ATT, amplifier, frequency mixer successively and resisting the input that mixes the filter that changes to be connected of the band pass filter that changes, and the output of described local oscillator LO is connected with the input of frequency mixer.The analog if signal frequency range is limited to 60MHz～200MHz, is convenient to the design and the realization of Radio Frequency Subsystem and Digital IF Processing system.Though the formation more complicated of Radio Frequency Subsystem, such processing, making does not need superfast sampling by the broadband analog if signal that output bandwidth is moderate, and follow-up A/D conversion process can be simplified greatly.
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, a kind of multi-carrier digital receiver based on digital intermediate frequency, it is characterized in that, comprise the radio frequency receiving subsystem, A/D converter, the digital baseband signal processing subsystem, the automatic frequency control subsystem, multi-carrier digital down-conversion subsystem, the output of described radio frequency receiving subsystem passes through A/D converter successively, multi-carrier digital down-conversion subsystem is connected with the input of digital baseband signal processing subsystem, the input of described automatic frequency control subsystem is connected with the output of digital baseband signal processing subsystem, and the output of described automatic frequency control subsystem is connected with the input of radio frequency receiving subsystem.
2, a kind of multi-carrier digital receiver according to claim 1 based on digital intermediate frequency, it is characterized in that, described multi-carrier digital down-conversion subsystem comprises that A/D sampling and AGC control module, single channel NCO generation module, first order quadrature modulation processing module, first order decimation filter group, multichannel NCO generation module, second level complex modulation processing module, second level decimation filter group, variable gain adjustment module, local oscillator suppress module, Data Format Transform module, data-interface control module, DDC system total control module; Described A/D sampling is connected with the input of data-interface control module by first order quadrature modulation processing module, first order decimation filter group, second level complex modulation processing module, second level decimation filter group, variable gain adjustment module, local oscillator inhibition module, Data Format Transform module successively with AGC control module output; The output of described single channel NCO generation module is connected with the input of first order quadrature modulation processing module; The output of described multichannel NCO generation module is connected with the input of second level complex modulation processing module; The output of described DDC system total control module is connected with another input that single channel NCO generation module, multichannel NCO generation module, variable gain adjustment module, local oscillator suppress module, Data Format Transform module, data-interface control module simultaneously.
3, a kind of multi-carrier digital receiver according to claim 2 based on digital intermediate frequency, it is characterized in that, described A/D sampling and AGC control module comprise AGC control module, A/D modular converter and control treatment module, the output of described AGC control module is connected with the control treatment module input by the A/D modular converter, and described control treatment module output connects the input of first order quadrature modulation processing module input and AGC control module respectively.
4, a kind of multi-carrier digital receiver according to claim 2 based on digital intermediate frequency, it is characterized in that, described second level complex modulation processing module comprises a plurality of modulation accumulator module, data time sequence is adjusted processing module, and described a plurality of modulation accumulator module are adjusted processing module with data time sequence simultaneously and are connected; Described modulation accumulator module comprises NCO signal lag processing module, I, Q signal delay process module behind the filtering extraction, multiplier, I, Q signal delay process module after the mixing, accumulator and add up back I, Q signal delay process module; The NCO signal lag processing module of described multichannel NCO generation module and a plurality of modulation accumulator module, multiplier, I, Q signal delay process module after the mixing, accumulator is connected successively with the back I that adds up, Q signal delay process module; I, Q signal delay process module behind the filtering extraction of described first order decimation filter group and a plurality of modulation accumulator module, multiplier, I, Q signal delay process module after the mixing, accumulator, I, Q signal delay process module after adding up, data time sequence are adjusted processing module and are connected successively.
5, a kind of multi-carrier digital receiver based on digital intermediate frequency according to claim 2 is characterized in that, described first order decimation filter group or second level decimation filter group are made up of one, two or three decimation filters respectively; Described decimation filter is FIR, IIR, CIC or partly is with decimation filter; Any one realization in described multi-carrier digital down-conversion subsystem CPLD, EPLD, FPGA, DSP programmable logic device or the asic chip.
6, a kind of multi-carrier digital receiver according to claim 1 based on digital intermediate frequency, it is characterized in that, described radio frequency receiving subsystem comprises anti-band pass filter, simulation ATT, amplifier, frequency mixer, local oscillator LO and the anti-repeatedly filter that mixes of mixing repeatedly, described anti-mixing being connected with the anti-input that mixes the filter that changes by simulation ATT, amplifier, frequency mixer successively of the band pass filter that changes, the output of described local oscillator LO is connected with the input of frequency mixer.
7, a kind of multi-carrier digital receiver according to claim 1 based on digital intermediate frequency, it is characterized in that, also comprise Clock Subsystem, microchip control subsystem, the output of described Clock Subsystem, microchip control subsystem is connected with another input of digital baseband signal processing subsystem with radio frequency receiving subsystem, A/D converter, multi-carrier digital down-conversion subsystem respectively.
8, realize the multi-carrier digital method of reseptance of the described multi-carrier digital receiver based on digital intermediate frequency of claim 1, may further comprise the steps:
(1) the radio frequency receiving subsystem is handled the received radiofrequency signal of antenna, changes radiofrequency signal into analog if signal and outputs to A/D converter;
(2) A/D converter carries out analog-to-digital conversion process with the analog if signal that receives, and the digital medium-frequency signal of output two-forty is to the Digital Down Convert subsystem;
(3) multi-carrier digital down-conversion subsystem carries out Digital Down Convert processing and carrier separation to digital medium-frequency signal, and the low speed baseband signal of output multicarrier is to the base band signal process subsystem;
(4) the base band signal process subsystem to the low speed baseband signal that receives comprise synchronously, the processing of channel-decoding, searching carrier processing and channel estimating, finish the reception of multiple carrier digital signal.
9, described according to Claim 8 multi-carrier digital method of reseptance, it is characterized in that, described step (3) multi-carrier digital down-conversion subsystem carries out Digital Down Convert processing and carrier separation to digital medium-frequency signal, the low speed baseband signal of output multicarrier may further comprise the steps to the base band signal process subsystem:
(a) the AGC control module will receive analog if signal and be sent to the A/D modular converter, the A/D modular converter carries out analog-to-digital conversion and forms digital medium-frequency signal, control module is according to the characteristic of digital medium-frequency signal, decision-making of output feedback and control information realize the automatic AGC control to the A/D chip to the AGC control module;
(b) digital medium-frequency signal of A/D sampling and the output of AGC control module is input to first order quadrature modulation processing module, carry out the mixed modulated processing with the cos and the sin signal of the output of single channel NCO generation module, the digital signal of output zero intermediate frequency, the digital signal of zero intermediate frequency enters into first order decimation filter group and carries out data pick-up and Filtering Processing;
(c) carry out data behind the filtering extraction through first order decimation filter group, the cos of a plurality of different frequencies that produce with multichannel NCO generation module and sin signal are input to second level complex modulation processing module to carry out mixed modulated and handles, and forms multicarrier I, Q signal; Multicarrier I, Q signal carry out further data pick-up and Filtering Processing by second level decimation filter group, multicarrier baseband I, the Q data of output low speed;
(d) through the signal process variable gain adjustment module after the two-stage modulation, the gain of each carrier wave can independently be adjusted accordingly, I, Q signal that the gain of output compliance with system requires;
(e) signal of variable gain adjustment module output carries out the inhibition of direct current local-oscillator leakage and carrier leak by local oscillator inhibition processing module, pass through the form of Data Format Transform module controls output signal then, at last again by the control data interface module, output is parallel, I, the Q data of serial or interlace mode.
According to the described multi-carrier digital method of reseptance of claim 9, it is characterized in that 10, the form of described step (e) output signal comprises the complement of two's two's complement, true form, offset code.
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