CN103957020B - A kind of signal intermediate frequency supporting multi-mode mobile communication system receives device - Google Patents
A kind of signal intermediate frequency supporting multi-mode mobile communication system receives device Download PDFInfo
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Abstract
A kind of signal intermediate frequency supporting multi-mode mobile communication system receives device and includes: AD sampling module, filtering extraction module, Digital Down Converter Module, PLL module and parameter automatically configure module；Input signal is carried out digital-to-analogue conversion by AD sampling module, obtains the intermediate-freuqncy signal of 54.24MHz；PLL module provides the clock of whole medium frequency reception device；Parameter automatically configures module and produces the filter factor needed for the frequency control word of Digital Up Convert module, filtering extraction module and extraction yield according to different communication standards；The signal that AD sampling module exports is down-converted to base band zero-frequency by Digital Down Converter Module；Filtering extraction module extracts according to filter factor and extraction yield and filters.Filtering extraction module includes that level Four filters；Digital Down Converter Module includes digital mixer.The present invention is applicable to many kinds of communication standards of LTE/CDMA/WCDMA/TD SCDMA, and system structure simplifies, and equipment volume is less, and cost is low.
Description
Technical field
The present invention relates to mobile communication Multimodal technology, particularly to a kind of signal intermediate frequency supporting multi-mode mobile communication system
Receive device.
Background technology
Along with mobile communication 3G and the development of LTE, multimode terminal will become the development trend of mobile terminal.Multiple shifting
Dynamic communication system needs to support communicating of multiple frequency range and multiple types, in order to realize different systems on the same hardware platform
Switching with communicate simultaneously.Along with the granting of LTE licence plate, the communication requirement of same support different mobile communication system becomes more
Come the most urgent.The wireless side of mobile communication system includes radio frequency, intermediate frequency, base band three part, and radio frequency can pass through software radio
Use same RF hardware to realize multimode to process；Baseband portion needs to call different base band for different mobile communication standards
Processing unit；Intermediate frequency wishes to use same hardware platform, calls different configurations for different standards and can realize in multimode
Frequency management.
Multi-mode mobile communication system can apply to the following aspects: multimode mobile communication terminal, multi-mode mobile communication
Base station, mobile communication target acquisition and audiomonitor.The technology of the demand driving of multi-mode mobile communication system multimode intermediate frequency sets
Meter and technological innovation.
At present, commercial multi-mode mobile communication system mainly includes GSM/TD-SCDMA/LTE, and GSM/WCDMA/LTE, its
Intermediate frequency mainly uses the method that multi-channel parallel receives, and is mainly reflected in the following aspects for different application:
(1) for multimode mobile communication terminal, using chip to process, it is logical that its chip uses parallel medium frequency reception to process
Road；
(2) for multi-mode mobile communication base station, parallel medium frequency reception treatment channel is used；
(3) for for management and control and audiomonitor, these equipment are independent, do not support to process multimode in identical platform
Mobile communication system.
The problem that above-mentioned detection method needs to exist:
(1) using parallel measurement channels, cost of device is big, and volume is big, costly；
(2) multimode signal cannot be realized in identical platform process；
(3) multimodality fusion of 3gpp and 3gpp2 it is not carried out；
(4) motility is low, and different standards can not be compatible, it is impossible to realizes different standards and frequency bandwidth flexible configuration.
Summary of the invention
In view of this, the present invention provides a kind of signal intermediate frequency supporting multi-mode mobile communication system to receive device, completes many
Mould medium frequency reception architecture design, completes Digital Down Convert and the filter parameter design of different systems different frequent points, and different system
The parameter of formula automatically configures.
For solving above-mentioned technical problem, present invention provide the technical scheme that
A kind of signal intermediate frequency supporting multi-mode mobile communication system receives device, it is characterised in that including, and: AD samples mould
Block, filtering extraction module, Digital Down Converter Module, PLL module and parameter automatically configure module；
Obtaining the 300MHz intermediate-freuqncy signal of band 60M after described radio frequency mixing and filtering, sampling clock is 245.76MHz, passes through
Input signal is carried out analog digital conversion and obtains the intermediate-freuqncy signal of 54.24MHz by AD sampling module；
Described PLL module is for providing the clock of whole described medium frequency reception device；
Described parameter automatically configures module for producing the frequency of described Digital Down Converter Module according to different communication standards
Filter factor needed for rate control word and described filtering extraction module and extraction yield；Parameter automatically configures module by upper computer software
Control FPGA and select the signal of different systems, and by Multi-model control module, the frequency of signal and the characteristic of wave filter can be entered
The configuration that row is real-time；
Described Digital Down Converter Module includes digital mixer and down-sampled filtration module, for by described AD sampling module
The signal of output is down-converted to base band zero-frequency；
Described filtering extraction module is for extracting according to described filter factor and described extraction yield and filter.
Preferably, the signal intermediate frequency of described support multi-mode mobile communication system receives device, it is characterised in that described logical
Letter standard includes: LTE, CDMA, WCDMA and TD-SCDMA.
Preferably, the signal intermediate frequency of described support multi-mode mobile communication system receives device, it is characterised in that described ginseng
Number automatically configures module and is completed by host computer, configures mixer frequency, filter coefficient and extracting multiple.
Preferably, the signal intermediate frequency of described support multi-mode mobile communication system receives device, it is characterised in that described number
Word down conversion module includes digital mixer；It is mixed to base under the signal that described AD sampling module is exported by described digital mixer
Band zero-frequency.
Preferably, the signal intermediate frequency of described support multi-mode mobile communication system receives device, it is characterised in that described in take out
Take filtration module and include first order filtering, second level filtering, third level filtering and fourth stage filtering；Wherein, described first order filter
Ripple uses cic filter；The filtering of the described second level and the filtering of the described third level use HBF wave filter；The filtering of the described fourth stage is adopted
Use FIR filter.
Preferably, the signal intermediate frequency of described support multi-mode mobile communication system receives device, it is characterised in that described
Mixer module is made up of numerically-controlled oscillator (NCO) and two multipliers.
Preferably, the signal intermediate frequency of described support multi-mode mobile communication system receives device, it is characterised in that described
The parameter of FIR filter is configured according to the characteristic of signal in host-host protocol.
Preferably, the signal intermediate frequency of described support multi-mode mobile communication system receives device, it is characterised in that described
Cic filter uses 5 grades of cascade single-stage cic filters to realize, and controls by configuring cascade number, difference time delay and interpolation rate
The bandwidth of described cic filter and Sidelobe Suppression ratio.
Preferably, the signal intermediate frequency of described support multi-mode mobile communication system receives device, it is characterised in that described
HBF wave filter is by avoiding signal harmonic to configure resistance band and passband width.
Preferably, the signal intermediate frequency of described support multi-mode mobile communication system receives device, it is characterised in that described AD
The baseband rate of the different described communication standard of sampling module compatibility.
Compared with prior art, beneficial effects of the present invention has:
1) present invention provides a hardware platform can support the intermediate frequency of many signals of TD-SCDMA/CDMA/WCDMA/LTE
Receive, simplied system structure, reduce equipment volume, reduce cost, lay the foundation for the portable of equipment and miniaturization；
2) present invention uses parameter auto configuration mode, when Systematic selection and parameter determination, and can be automatic according to parameter
The control parameter of configuration completes to configure accordingly, the operation of simplified system；
3) present invention is applicable to multi-module mobile terminal, multi-mode mobile communication system equipment, multi-mode mobile communication target acquisition
Research and develop with audiomonitor, simplify development platform, shorten the construction cycle；
4) receiving terminal of the present invention shares an AD sampler, and AD sampling employing meets TD-SCDMA/CDMA/WCDMA/
The parameter that LTE frequency spectrum and baseband system require, is adapted to multi-mode mobile communication system signal reception and process.
Accompanying drawing explanation
Fig. 1 is the structural representation of the signal intermediate frequency reception device of the support multi-mode mobile communication system of the present invention；
Fig. 2 is that the present invention supports that the parameter that the signal intermediate frequency of multi-mode mobile communication system receives device automatically configures module and shows
It is intended to；
Fig. 3 is that the present invention supports that the signal intermediate frequency of multi-mode mobile communication system receives the filtering extraction module signal of device
Figure；
Fig. 4 is that the present invention supports that the signal intermediate frequency of multi-mode mobile communication system receives the multimode digital intermediate frequency receiving area of device
Reason flow chart；
Fig. 5 is the CIC single-section filter of the signal intermediate frequency reception device of the support multi-mode mobile communication system of the present invention
Structure chart；
Fig. 6 is CIC amplitude-versus-frequency curve；
Fig. 7 is HBF amplitude-versus-frequency curve.
Detailed description of the invention
The present invention is carried out further below in conjunction with accompanying drawing and embodiment for the ease of it will be appreciated by those skilled in the art that
Describe in detail.
As it is shown in figure 1, disclosed a kind of signal intermediate frequency supporting multi-mode mobile communication system receives device bag
Include: AD sampling module, parameter automatically configure module, Digital Down Converter Module, PLL module and filtering extraction module.AD samples mould
The sampling rate of block is identical, and this sample rate requires tetra-kinds of standard baseband rate of compatible TD-SCDMA/CDMA/WCDMA/LTE.Parameter
Automatically configure module, needed for producing the frequency control word of Digital Up Convert module, filtering extraction module according to different communication standard
Filter factor and extraction yield.Automatically configure module according to parameter, select different communication standards can complete down coversion parameter
The parameter of setting, withdrawal device and level Four filtering is arranged.The signal frequency conversion that AD sampling module is exported by Digital Down Converter Module is to narrow
On band frequency.Data signal rate is extracted according to different standards and configuration parameter and filters by filtering extraction module, becomes
Frequency is on the multiple of baseband rate.PLL module is for providing the clock of whole medium frequency reception device.
AD sampling module needs to take into account the baseband rate of tetra-kinds of standards of TD-SCDMA/CDMA/WCDMA/LTE.For receiving
For, radio-frequency head mixing and filtering obtains the 300MHz intermediate-freuqncy signal of bandwidth 60MHz, and sampling clock is designed as 245.76MHz, passes through
The digital intermediate frequency signal of 54.24MHz is obtained after the sampling of A/D sampling module.
As in figure 2 it is shown, parameter automatically configures module is controlled the signal of FPGA selection different systems, and energy by upper computer software
Enough by Multi-model control module, the frequency of signal and the characteristic of wave filter are carried out real-time configuration so that Multi-model control becomes spirit
Live and efficient.
The selection function of frequency is to be completed by digital mixer NCO and narrow-band filtering.Signal obtains after A/D samples
The intermediate frequency of 54.24MHz, produces corresponding carrier frequency by digital mixer NCO control word in the range of 60MHz according to demand and believes
Number, demand frequency signal is moved fundamental frequency and by follow-up narrow-band filtering, the frequency signal of needs is leached.
Determining mobile communication standard a certain, the characteristic of wave filter is pre-set, only need to by control software can
The frequency control word of change digital mixer NCO produces the corresponding carrier frequency of different frequent points in real time, just can be right
In bandwidth, any available frequency point processes.
Filtering extraction module as shown in Figure 3, its major function is to filter out the signal of required single-frequency point, in order to base band
Data process.For the communication system of the different standard such as 3G, LTE, its single-frequency point bandwidth is different.Through down coversion with
After data, although be the signal of zero frequency, but its sample rate be too high, considerably increased the pressure of Base-Band Processing speed.
This is accomplished by intermediate-frequency section and extracts to reduce sample rate to signal.Owing to signal has two-forty to be converted to the letter of low rate
Number, single-section filter extraction multiplying power is the highest, and single-stage filtering extraction is difficulty with, and therefore system uses level Four to filter data
Down-sampled rate and filtering: first order filtering is higher in view of intermediate frequency front signal data transfer rate, uses filtering characteristic at the high velocities
Preferably cic filter carries out down-sampled rate and the filtering of data transfer rate；Second level filtering and the third level filter for the system of saving
Resource, uses filter order less half-band filter HBF1 and HBF2 to complete down-sampled rate and filtering；The fourth stage filters
The FIR filter with preferable passband and stopband characteristic is used to complete.Taking out of wave filter can be controlled in multimode narrow-band filtering
The rate of taking obtains the baseband signal of spreading rate integral multiple.
The major function of Digital Down Converter Module is that the digital signal after being sampled by AD is mixed to base band zero under NCO
Frequently；Then produce single-frequency point baseband signal by the filtering of the level Four of filtering extraction module, and deliver to base band and process.
As shown in Figure 4, in figure, fnco is to be produced by the frequency control word of configuration NCO in real time to Digital Down Convert handling process
The mixing frequencies of raw corresponding frequency, M1、M2、M3、M4It is respectively the extraction yield of filtering at different levels, fcic、fhbf1、fhbf2、ffirIt it is root
The sample rate obtained according to every kind of standard signal extraction yield, these parameters can automatically configure module by parameter and join flexibly
Put.It addition, for each communication standard, the parameter of every one-level wave filter (such as the bandwidth of wave filter, coefficient, cut position etc.) is also
Do corresponding configuration.The parameter that can be configured in real time by these, it is achieved thereby that the data of multimode intermediate frequency process.According to each system
Formula characteristics of signals, extrapolates the intermediate frequency parameters that each standard is corresponding.Major parameter has digital mixer frequency, extraction yield and filtering
The characteristic of device.
The frequency of digital mixer NCO is to be determined by the frequency in signal frequency range.For receiving, radio frequency is by certain
Certain frequency range of standard signal moves 300MHz intermediate frequency, through AD sampled signal frequency spectrum shift to 54.24MHz, by numeral
The frequency of needs is moved to fundamental frequency by frequency mixer, then is leached by the frequency of needs by narrow-band filtering.Various standard signals pair
Frequency range and the frequency answered are shown in Table 1.
Table 1 various standard type mobile communication system corresponding frequency band and frequency point information table
Systematic sampling rate is 245.76Msps, in order to obtain the signal of single times of spreading rate, it is contemplated that the exponent number of wave filter
And use resources of chip to minimize, use the principle of level Four filtering and extraction coefficient sum minimum to complete the configuration of extraction yield.
Each standard corresponding extraction yield configuration be shown in Table 2.
The extraction yield allocation list that each standard of table 2 is corresponding
The characteristic of wave filter is directly connected to the quality of signal quality, by every one-level filter characteristic is analyzed and
Calculate, draw the filter parameter of the demand of disclosure satisfy that.
Fig. 5 is the structure chart of CIC single-section filter, and cic filter is a kind of integral comb filter, only comprises addition
Device, integrator and depositor, and there is not multiplier, therefore can effectively be applied in high sampling rate system.It includes
Two elements: integral part and comb section.
Owing to the sidelobe level of single-stage cic filter is relatively big, stopband attenuation is poor, and the first side lobe attenuation only has 13.46dB.
In order to reduce sidelobe level, the cascade of multistage cic filter can be used to obtain the preferable wave filter of stopband attenuation, and cascade N level
Being directly proportional to the decay of single-stage cic filter of side lobe attenuation, the i.e. first side lobe attenuation N*13.46dB.
Although cascade can increase stopband attenuation, reduce the impact of aliasing, but tolerance in band can be increased simultaneously, so CIC
Cascade number is conditional, and 5 grades of cascades of general employing realize.Fig. 6 is CIC amplitude-versus-frequency curve, and wherein D is the difference of wave filter
Dividing time delay, M is extraction.The bandwidth of cic filter, secondary lobe can be controlled by configuring cascade number N, difference time delay D and extraction yield M
The filtering characteristics such as rejection ratio.
HBF wave filter is adapted to carry out 2 times of extractions, owing to decreasing half storage and amount of calculation, therefore in high speed processing
There is computational efficiency high, the advantage such as real-time.The amplitude-versus-frequency curve of HBF is as shown in Figure 7.The resistance band of HBF and passband
Width is equal, and the width of intermediate zone is to be together decided on by passband and sample rate.In order to avoid the entrance of signal harmonic is to letter
Number produce Image interference, need to be designed the intermediate zone of HBF so that in intermediate zone, more likely suppress harmonic wave.
FIR filter has the features such as band-pass behavior is good, transition is little, Out-of-band rejection is good.In order to make output arrive the letter of base band
Number there is more preferable signal to noise ratio, can directly according to agreement, FIR filter parameter be configured by the requirement of signal.Such as,
In the host-host protocol of CDMA2000, parameter to wave filter has had that to clearly state passband be 590KHz, and stopband is 740KHz, then exist
FIR parameter designing can directly use these parameters configure.
Designed by above parameter configuration, draw according to different systems characteristics of signals in the multimode of downlink reception, uplink receiving
Frequently parameter configuration.
Multi-mode mobile communication downlink reception intermediate frequency parameters configures such as table 3.
Table 3 downlink reception multimode intermediate frequency parameters allocation list
Multi-mode mobile communication uplink receiving intermediate frequency parameters configures such as table 4.
Table 4 uplink receiving multimode intermediate frequency configures
Being more than the wherein specific implementation of the present invention, it describes more concrete and detailed, but can not therefore manage
Solve as the restriction to the scope of the claims of the present invention.It should be pointed out that, for the person of ordinary skill of the art, without departing from
On the premise of present inventive concept, it is also possible to make some deformation and improvement, these obvious alternative forms belong to this
Bright protection domain.
Claims (10)
1. the signal intermediate frequency supporting multi-mode mobile communication system receives device, it is characterised in that including:
AD sampling module, filtering extraction module, Digital Down Converter Module, PLL module and parameter automatically configure module；
Obtaining the 300MHz intermediate-freuqncy signal with a width of 60MHz after radio frequency mixing and filtering, sampling clock is 245.76MHz, through AD
Input signal is carried out analog digital conversion and obtains the intermediate-freuqncy signal of 54.24MHz by sampling module；
Described PLL module is for providing the clock of whole described medium frequency reception device；
Described parameter automatically configures module for producing the frequency control of described Digital Down Converter Module according to different communication standards
Filter factor needed for word processed and described filtering extraction module and extraction yield；Parameter automatically configures module by upper computer software control
FPGA selects the signal of different systems, and by Multi-model control module, the frequency of signal and the characteristic of wave filter can be carried out reality
Time configuration；
Described Digital Down Converter Module includes digital mixer and down-sampled filtration module, for being exported by described AD sampling module
Signal be down-converted to base band zero-frequency；
Described filtering extraction module is for extracting according to described filter factor and described extraction yield and filter.
The signal intermediate frequency of support multi-mode mobile communication system the most according to claim 1 receives device, it is characterised in that institute
State communication standard to include: LTE, CDMA, WCDMA and TD-SCDMA.
The signal intermediate frequency of support multi-mode mobile communication system the most according to claim 1 receives device, it is characterised in that institute
State parameter to automatically configure module and completed by host computer, configure mixer frequency, filter coefficient and extracting multiple.
The signal intermediate frequency of support multi-mode mobile communication system the most according to claim 2 receives device, it is characterised in that institute
State Digital Down Converter Module and include digital mixer；It is mixed under the signal that described AD sampling module is exported by described digital mixer
To base band zero-frequency.
The signal intermediate frequency of support multi-mode mobile communication system the most according to claim 2 receives device, it is characterised in that institute
State filtering extraction module and include first order filtering, second level filtering, third level filtering and fourth stage filtering；Wherein, described first
Level filtering uses cic filter；The filtering of the described second level and the filtering of the described third level use HBF wave filter；The described fourth stage is filtered
Ripple uses FIR filter.
The signal intermediate frequency of support multi-mode mobile communication system the most according to claim 4 receives device, it is characterised in that institute
The mixer module stated is made up of numerically-controlled oscillator (NCO) and two multipliers.
The signal intermediate frequency of support multi-mode mobile communication system the most according to claim 5 receives device, it is characterised in that institute
The parameter stating FIR filter is configured according to the characteristic of signal in host-host protocol.
The signal intermediate frequency of support multi-mode mobile communication system the most according to claim 5 receives device, it is characterised in that institute
Stating cic filter uses 5 grades of cascade single-stage cic filters to realize, and by configuring cascade number, difference time delay and interpolation rate control
Make bandwidth and the Sidelobe Suppression ratio of described cic filter.
The signal intermediate frequency of support multi-mode mobile communication system the most according to claim 5 receives device, it is characterised in that institute
Stating HBF wave filter is by avoiding signal harmonic to configure resistance band and passband width.
The signal intermediate frequency of support multi-mode mobile communication system the most according to claim 2 receives device, it is characterised in that
The baseband rate of the different described communication standard of described AD sampling module compatibility.
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| CN104661287B (en) * | 2015-03-23 | 2019-02-22 | 重庆邮电大学 | A kind of parallel multi-channel rapid frequency-sweeping method and system for supporting multimode |
| CN105049076B (en) * | 2015-08-25 | 2018-07-13 | 四川九洲电器集团有限责任公司 | software radio communication method and system |
| CN109088639A (en) * | 2017-06-14 | 2018-12-25 | 北京遥感设备研究所 | The general configurable Digital Down Convert IP kernel of one kind and its method |
| CN109586687A (en) * | 2018-12-05 | 2019-04-05 | 中科院计算技术研究所南京移动通信与计算创新研究院 | Digital Down Convert filter, system, filtering method, device and its storage medium |
| CN109617557B (en) * | 2018-12-28 | 2021-02-26 | 中科院计算技术研究所南京移动通信与计算创新研究院 | Digital transceiver, digital transceiver system, digital transceiver control method, digital transceiver control device and storage medium |
| CN109687826B (en) * | 2018-12-28 | 2021-04-27 | 中科院计算技术研究所南京移动通信与计算创新研究院 | Multi-channel down-conversion method and device based on model design and storage medium |
| CN110690909B (en) * | 2019-10-12 | 2022-04-05 | 湖南智领通信科技有限公司 | Low-complexity dynamic non-uniform channelized user separation method |
| CN113078902A (en) * | 2020-01-06 | 2021-07-06 | 炬芯科技股份有限公司 | Analog-to-digital conversion system and audio equipment |
| CN112731454B (en) * | 2020-12-22 | 2024-03-19 | 湖南北云科技有限公司 | Intermediate frequency digital down-conversion method, circuit, baseband chip and satellite navigation receiver |
| CN114257285B (en) * | 2021-12-13 | 2023-11-21 | 中国电子科技集团公司第十四研究所 | Method and system for filtering sensing signals of general sense integrated base station |
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