CN103957020A - Signal intermediate-frequency receiving device suitable for multimode mobile communication system - Google Patents
Signal intermediate-frequency receiving device suitable for multimode mobile communication system Download PDFInfo
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Abstract
A signal intermediate-frequency receiving device suitable for a multimode mobile communication system comprises an AD sampling module, a decimation filter module, a digital down-conversion module, a PLL module and an automatic parameter configuration module. The AD sampling module is used for carrying out DA conversion on an input signal to obtain a 54.24 MHz intermediate-frequency signal. The PLL module is used for providing a clock for the whole intermediate-frequency receiving device. The automatic parameter configuration module is used for generating the frequency control word of the digital down-conversion module and the filter coefficient and decimation ratio needed by the decimation filter module according to diffident communication standards. The digital down-conversion module is used for carrying out down-conversion on a signal output by the AD sampling module to achieve baseband zero frequency of the signal. The decimation filter module is used for carrying out decimation and filtering according to the filter coefficient and the decimation ratio, and comprises a four-stage filter. The digital down-conversion module comprises a digital mixer. The signal intermediate-frequency receiving device can meet various communication standards like LTE/CDMA/WCDMA/TD-SCDMA, and is simpler in system structure, small in equipment size and low in manufacturing cost.
Description
Technical field
The present invention relates to mobile communication multimode technology, particularly a kind of signal intermediate frequency receiving system of supporting multi-mode mobile communication system.
Background technology
Along with the development of mobile communication and 3G and LTE, multimode terminal will become the development trend of mobile terminal.Various kinds of mobile communication system need to be supported communicating by letter of a plurality of frequency ranges and multiple types, so as on same hardware platform, to realize to the switching of different systems with communicate by letter simultaneously.Along with the granting of LTE licence plate, the communication requirement of same support different mobile communication system becomes more and more urgent.The wireless side of mobile communication system comprises radio frequency, intermediate frequency, base band three parts, and radio frequency can adopt same radio frequency hardware to realize multimode by software radio and process; Baseband portion need to be called different baseband processing units for different mobile communication standards; Intermediate frequency wishes to adopt same hardware platform, calls different configurations can realize the management of multimode intermediate frequency for different standards.
Multi-mode mobile communication system can be applied to the following aspects: multimode mobile communication terminal, multi-mode mobile communication base station, mobile communication target acquisition and audiomonitor.The demand driving of multi-mode mobile communication system art designs and the technological innovation of multimode intermediate frequency.
At present, commercial multi-mode mobile communication system mainly comprises GSM/TD-SCDMA/LTE, and GSM/WCDMA/LTE, and the method that its intermediate frequency mainly adopts multi-channel parallel to receive, is mainly reflected in the following aspects for different application:
(1) for multimode mobile communication terminal, adopt chip to process, its chip adopts parallel intermediate frequency reception & disposal passage;
(2), for multi-mode mobile communication base station, adopt parallel intermediate frequency reception & disposal passage;
(3) for for management and control and audiomonitor, these equipment are independently, are not supported in and in identical platform, process multi-mode mobile communication system.
The problem that above-mentioned detection method need to exist:
(1) adopt parallel processing passage, cost of device is large, and volume is large, and expense is high;
(2) cannot in identical platform, realize multimode signal processes;
(3) do not realize the multimodality fusion of 3gpp and 3gpp2;
(4) flexibility is low, and different standards can not be compatible, can not realize different standards and frequency bandwidth
Flexible configuration.
Summary of the invention
In view of this, the invention provides a kind of signal intermediate frequency receiving system of supporting multi-mode mobile communication system, complete multimode intermediate frequency and receive architecture design, complete Digital Down Convert and the filter parameter design of different systems different frequent points, and the parameter of different systems configures automatically.
For solving the problems of the technologies described above, technical scheme provided by the invention is:
A signal intermediate frequency receiving system of supporting multi-mode mobile communication system, is characterized in that, comprising: AD sampling module, filtering extraction module, Digital Down Converter Module, PLL module and the automatic configuration module of parameter;
Described AD sampling module carries out digital-to-analogue conversion by input signal, obtains the intermediate-freuqncy signal of 54.24MHz;
Described PLL module is for providing the clock of whole described frequency receiver;
The automatic configuration module of described parameter is for producing the frequency control word of described Digital Up Convert module, required filter factor and the extraction yield of described filtering extraction module according to different communication standards;
Described Digital Down Converter Module is for being down-converted to base band zero-frequency by the signal of described AD sampling module output;
Described filtering extraction module, for extracting and filtering according to described filter factor and described extraction yield, is converted on the multiple of base band speed.
Preferably, described communication standard comprises: LTE, CDMA, WCDMA and TD-SCDMA.
Preferably, described Digital Down Converter Module comprises digital mixer; Described digital mixer will be mixed to base band zero-frequency under the signal of described AD sampling module output.
Preferably, described filtering extraction module comprises first order filtering, second level filtering, third level filtering and fourth stage filtering;
Wherein, described first order filtering adopts FIR filter; The filtering of the described second level and described third level filtering adopt HBF filter; Described fourth stage filtering adopts cic filter.
Preferably, the parameter of described FIR filter arranges according to the characteristic of signal in host-host protocol.
Preferably, described cic filter adopts 5 grades of cascade single-stage cic filters to realize, and by configuration cascade number, difference time delay and interpolation rate, controls bandwidth and the Sidelobe Suppression ratio of described cic filter.
Preferably, described HBF filter is by avoiding signal harmonic to configure resistance band and passband width.
Preferably, the base band speed of the compatible different described communication standards of described AD sampling module.
Preferably, radio frequency is moved 300MHz intermediate frequency by certain frequency range of a kind of standard signal in TD-SCDMA/CDMA/WCDMA/LTE, after the sampling of AD sampling module, signal spectrum is moved to 54.24MHz, by digital mixer, the frequency of needs is moved to fundamental frequency, then by narrow-band filtering, the frequency of needs is leached.
Compared with prior art, beneficial effect of the present invention has:
1) the invention provides a hardware platform and can support the intermediate frequency of many signals of TD-SCDMA/CDMA/WCDMA/LTE to receive, simplied system structure, reduction equipment volume, reduces cost, for the portable and miniaturization of equipment lays the foundation;
2) the present invention adopts parameter auto configuration mode, in system, select and when parameter determines, can according to parameter automatically the control parameter of configuration complete corresponding configuration, the operation of simplification system;
3) the present invention is applicable to multi-module mobile terminal, multi-mode mobile communication system equipment, multi-mode mobile communication target acquisition and audiomonitor research and development, simplifies development platform, shortens the construction cycle;
4) receiving terminal of the present invention shares an AD sampler, and AD sampling adopts the parameter that meets TD-SCDMA/CDMA/WCDMA/LTE frequency spectrum and baseband system requirement, is adapted to multi-mode mobile communication system signal and receives and process.
Accompanying drawing explanation
Fig. 1 is the structural representation of the signal intermediate frequency receiving system of support multi-mode mobile communication system of the present invention;
Fig. 2 is the automatic configuration module schematic diagram of parameter of the present invention's signal intermediate frequency receiving system of supporting multi-mode mobile communication system;
Fig. 3 is the filtering extraction module diagram that the present invention supports the signal intermediate frequency receiving system of multi-mode mobile communication system;
Fig. 4 is the multimode digital intermediate frequency reception & disposal flow chart of the present invention's signal intermediate frequency receiving system of supporting multi-mode mobile communication system;
Fig. 5 is the structure chart of CIC single-section filter of the signal intermediate frequency receiving system of support multi-mode mobile communication system of the present invention;
Fig. 6 is CIC amplitude-versus-frequency curve;
Fig. 7 is HBF amplitude-versus-frequency curve.
Embodiment
For the ease of it will be appreciated by those skilled in the art that below in conjunction with accompanying drawing and embodiment, the present invention is explained in further detail.
As shown in Figure 1, disclosedly a kind ofly support the signal intermediate frequency receiving system of multi-mode mobile communication system to comprise: AD sampling module, the automatic configuration module of parameter, Digital Down Converter Module, PLL module and filtering extraction module.The sampling rate of AD sampling module is identical, and this sample rate needs tetra-kinds of standard base band speed of compatible TD-SCDMA/CDMA/WCDMA/LTE.The automatic configuration module of parameter, according to required filter factor and the extraction yield of frequency control word, filtering extraction module of different communication standard generation Digital Up Convert module.According to the automatic configuration module of parameter, select different communication standards can complete the parameter setting of the setting of down-conversion parameter, withdrawal device and level Four filtering.The signal frequency conversion that Digital Down Converter Module is exported AD sampling module is to arrowband frequency.Filtering extraction module extracts data signal rate and filtering according to different standards and configuration parameter, is converted on the multiple of base band speed.PLL module is for providing the clock of whole frequency receiver.
AD sampling module need to be taken into account the base band speed of tetra-kinds of standards of TD-SCDMA/CDMA/WCDMA/LTE.For reception, radio-frequency head mixing and filtering obtains the 300MHz intermediate-freuqncy signal that bandwidth is 60MHz, and sampling clock is designed to 245.76MHz, obtains the digital intermediate frequency signal of 54.24MHz after the sampling of A/D sampling module.
As shown in Figure 2, the automatic configuration module of parameter mainly controls by upper computer software the signal that FPGA selects different systems, and can to the characteristic of the frequency of signal and filter etc., carry out real-time configuration by multimode control module, multimode is controlled become flexibly and efficient.
The selection function of frequency is to be completed by digital mixer NCO and narrow-band filtering.Signal obtains the intermediate frequency of 54.24MHz after A/D sampling, within the scope of 60MHz, by digital mixer NCO control word, produce corresponding CF signal according to demand, demand frequency signal is moved to fundamental frequency and by follow-up narrow-band filtering, the frequency signal of needs is leached.
In a certain definite mobile communication standard, the characteristic of filter is pre-set, the frequency control word that only need can change in real time by controlling software digital mixer NCO produces the corresponding carrier frequency frequency of different frequent points, just can process any available frequency in bandwidth.
Filtering extraction module as shown in Figure 3, its major function is the signal that leaches required single-frequency point, so that the data processing of base band.For the communication system of the different standard such as 3G, LTE, its single-frequency point bandwidth is different.Data after down-conversion, although be the signal of zero frequency, its sample rate is too high, has greatly increased the pressure of Base-Band Processing speed.This just needs intermediate-frequency section to extract to reduce sample rate to signal.Because having two-forty, signal is converted to the signal of low rate, it is very high that single-section filter extracts multiplying power, single-stage filtering extraction is difficult to realize, therefore system adopts level Four filtering to complete reduce sampling frequency and the filtering of data: first order filtering considers that intermediate frequency leading portion signal data rate is higher, adopts the good cic filter of filtering characteristic under two-forty to carry out reduce sampling frequency and the filtering of data transfer rate; Second level filtering and third level filtering, in order to save system resource, adopt less half-band filter HBF1 and the HBF2 of filter order to complete reduce sampling frequency and filtering; Fourth stage filtering adopts the FIR filter with better passband and stopband characteristic to complete.The extraction yield that can control filter in multimode narrow-band filtering obtains the baseband signal of spreading rate integral multiple.
The major function of Digital Down Converter Module is that the digital signal after AD sampling is mixed to base band zero-frequency through under NCO; Then the level Four filtering by filtering extraction module produces single-frequency point baseband signal, and delivers to base band and process.
Digital Down Convert handling process as shown in Figure 4, in figure, f
ncofor produce the mixing frequency of corresponding frequency, M by the real-time frequency control word that configures NCO
1, M
2, M
3, M
4be respectively the extraction yield of filtering at different levels, f
cic, f
hbf1, f
hbf2, f
firbe the sample rate obtaining according to every kind of standard signal extraction yield, these parameters can both be carried out flexible configuration by parameter automatic configuration module.In addition, for each communication standard, the parameter of every one-level filter (as the bandwidth of filter, coefficient, cut position etc.) also will be done corresponding configuration.The parameter that can configure in real time by these, thus realized the data processing of multimode intermediate frequency.According to each standard signal characteristic, extrapolate intermediate frequency parameters corresponding to each standard.Major parameter has the characteristic of digital mixer frequency, extraction yield and filter.
The frequency of digital mixer NCO is determined by the frequency in signal frequency range.For reception, radio frequency is moved 300MHz intermediate frequency by certain frequency range of certain standard signal, after AD sampling, signal spectrum is moved to 54.24MHz, by digital mixer, the frequency of needs is moved to fundamental frequency, then by narrow-band filtering, the frequency of needs is leached.The frequency range that various standard signals are corresponding and frequency are 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, considers the exponent number of filter and uses resources of chip to minimize, and the principle of employing level Four filtering and extraction coefficient sum minimum completes the configuration of extraction yield.Extraction yield corresponding to each standard configures in Table 2.
The extraction yield allocation list that each standard of table 2 is corresponding
The characteristic of filter is directly connected to the quality of signal quality, by every one-level filter characteristic is analyzed and calculated, draws the filter parameter that can satisfy the demands.
Fig. 5 is the structure chart of CIC single-section filter, and cic filter is a kind of integral comb filter, only comprises adder, integrator and register, and does not have multiplier, therefore in high sampling rate system, can effectively be applied.It comprises two elements: integral part and comb section.
Because the sidelobe level of single-stage cic filter is larger, stopband attenuation is poor, and the first side lobe attenuation only has 13.46dB.In order to reduce sidelobe level, can adopt multistage cic filter cascade to obtain the good filter of stopband attenuation, and being directly proportional to single-stage cic filter decay of cascade N level side lobe attenuation, i.e. the first side lobe attenuation N*13.46dB.
Although cascade can increase stopband attenuation, reduced the impact of aliasing, can increase tolerance in band simultaneously, so CIC cascade number is conditional, generally adopt 5 grades of cascades to realize.Fig. 6 is CIC amplitude-versus-frequency curve, the difference time delay that wherein D is filter, and M is for extracting.By configuration cascade, count bandwidth, Sidelobe Suppression that N, difference time delay D and extraction yield M can control cic filter and the filtering characteristic such as compare.
HBF filter is applicable to realize 2 times of extractions, owing to subtracting, is a half storage and amount of calculation, therefore the advantage such as it is high to have computational efficiency in high speed processing, real-time.The amplitude-versus-frequency curve of HBF as shown in Figure 7.The resistance band of HBF equates with passband width, and the width of transition band is jointly to be determined by passband and sample rate.For fear of entering of signal harmonic, signal is produced to mirror image and disturb, the transition band of HBF need to be designed, make to suppress more possibly harmonic wave in transition band.
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 the signal that outputs to base band there is better signal to noise ratio, can directly according to agreement, to signal, recklessly require FIR filter parameter to arrange.For example, in the host-host protocol of CDMA2000, the parameter of filter having been had to the passband of clearly stating is 590KHz, and stopband is 740KHz, in FIR parameter designing, can directly adopt these parameters to be configured.
By above parameter configuration, designed, according to different systems characteristics of signals, draw the multimode intermediate frequency parameters configuration of descending reception, uplink receiving.
The descending reception intermediate frequency parameters configuration of multi-mode mobile communication is as table 3.
The descending reception multimode of table 3 intermediate frequency parameters allocation list
The configuration of multi-mode mobile communication uplink receiving intermediate frequency parameters is as table 4.
Table 4 uplink receiving multimode intermediate frequency allocation list
Be more than wherein specific implementation of the present invention, it describes comparatively concrete and detailed, but can not therefore be interpreted 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 the inventive concept of the premise, can also make some distortion and improvement, these apparent replacement forms all belong to protection scope of the present invention.
Claims (8)
1. a signal intermediate frequency receiving system of supporting multi-mode mobile communication system, is characterized in that, comprising: AD sampling module, filtering extraction module, Digital Down Converter Module, PLL module and the automatic configuration module of parameter;
Described AD sampling module carries out digital-to-analogue conversion by input signal, obtains the intermediate-freuqncy signal of 54.24MHz;
Described PLL module is for providing the clock of whole described frequency receiver;
The automatic configuration module of described parameter is for producing frequency control word and required filter factor and the extraction yield of described filtering extraction module of described Digital Up Convert module according to different communication standards;
Described Digital Down Converter Module is for being down-converted to base band zero-frequency by the signal of described AD sampling module output;
Described filtering extraction module is for extracting and filtering according to described filter factor and described extraction yield.
2. the signal intermediate frequency receiving system of support multi-mode mobile communication system according to claim 1, is characterized in that, described communication standard comprises: LTE, CDMA, WCDMA and TD-SCDMA.
3. the signal intermediate frequency receiving system of support multi-mode mobile communication system according to claim 2, is characterized in that, described Digital Down Converter Module comprises digital mixer; Described digital mixer will be mixed to base band zero-frequency under the signal of described AD sampling module output.
4. the signal intermediate frequency receiving system of support multi-mode mobile communication system according to claim 2, is characterized in that, described filtering extraction module comprises first order filtering, second level filtering, third level filtering and fourth stage filtering;
Wherein, described first order filtering adopts FIR filter; The filtering of the described second level and described third level filtering adopt HBF filter; Described fourth stage filtering adopts cic filter.
5. the signal intermediate frequency receiving system of support multi-mode mobile communication system according to claim 4, is characterized in that, the parameter of described FIR filter arranges according to the characteristic of signal in host-host protocol.
6. the signal intermediate frequency receiving system of support multi-mode mobile communication system according to claim 4, it is characterized in that, described cic filter adopts 5 grades of cascade single-stage cic filters to realize, and by configuration cascade number, difference time delay and interpolation rate, controls bandwidth and the Sidelobe Suppression ratio of described cic filter.
7. the signal intermediate frequency receiving system of support multi-mode mobile communication system according to claim 4, is characterized in that, described HBF filter is by avoiding signal harmonic to configure resistance band and passband width.
8. the signal intermediate frequency receiving system of support multi-mode mobile communication system according to claim 2, is characterized in that, the base band speed of the compatible different described communication standards of described AD sampling module.
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