CN104079310A - Ultrashort wave data transmission receiving system based on software radio architecture and receiving method thereof - Google Patents
Ultrashort wave data transmission receiving system based on software radio architecture and receiving method thereof Download PDFInfo
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Abstract
The invention discloses an ultrashort wave data transmission receiving system based on a software radio architecture. The ultrashort wave data transmission receiving system comprises a radio-frequency device and a software radio module, wherein the radio-frequency device comprises a receiving module and a down-conversion module, and high-frequency analog signals are received through the receiving module and changed into medium-frequency analog signals in a down-conversion mode through the down-conversion module. The software radio module comprises an A/D conversion module, a digital down-conversion module, a demodulation module and a D/A conversion module. The A/D conversion module converts the medium-frequency analog signals into digital signals, the digital down-conversion module carries out down-conversion and multi-level decimation filtering on the digital signals to obtain baseband signals, and the baseband signals are demodulated through the demodulation module and converted into analog signals through the D/A conversion module to be output. The defects that a traditional radio station can only transmit AM and demodulate the signals in the single mode of a single side band are overcome, data transmission is diversified, and information including voice messages, images, faxes and the like is transmitted. The invention further discloses an ultrashort wave data transmission receiving method based on the software radio architecture.
Description
Technical field
The invention belongs to telecommunications context, relate in particular to a kind of ultrashort wave number based on software radio framework and pass receiving system and method for reseptance thereof.
Background technology
The emergency system of current operation on the sea is mainly telephonic communication system and traditional station receiving system.Telephone communication mode, once there is spontaneous combustion disaster, war, take optical cable when main transmission medium and mobile base station are destroyed, and emergency commading system will paralyse; Traditional radio station receiving system is mostly the hardware system based on simulation, in addition demodulation mode mostly adopts AM, SSB demodulation mode, demodulation mode single makes the receiving system can only receiving speech information, cannot receive comparatively complicated image, fax digital information, inefficiency.Be accompanied by the fast development of various communication modes, the voice messaging by single of transmission information is transformed into image, and the various ways such as fax are therefore more and more higher to the requirement of receiving equipment.The at present digitlization of receiving equipment, new demodulation mode is by the developing direction that is following receiving system flexibly, and the hardware system of tradition based on simulation replaced by digital circuit or software gradually.But because the ultrashort wave of radio station transmitting has very high frequency, inadaptable by digital circuit or software demodulation and processing.So need a kind of receiving system badly, meet diversified communication and ultrashort wave receiving system, to tackle the operation on the sea becoming increasingly complex, improve promptness, the safety and reliability of marine emergency system.
Summary of the invention
The present invention has overcome above-mentioned defect in prior art, has proposed a kind of ultrashort wave number based on software radio framework and has passed receiving system and method for reseptance thereof.
The present invention proposes a kind of ultrashort wave number based on software radio framework and pass receiving system, with software mode, to realize and receive radio ultrashort wave in FPGA, comprise: radio-frequency unit, it comprises receiver module and down conversion module, described receiver module is used for receiving high frequency analog signals, and described down conversion module is for downconverting to analog intermediate frequency signal by described high frequency analog signals; Software radio module, it comprises A/D modular converter, Digital Down Converter Module, demodulation module and D/A modular converter; Described A/D modular converter is converted to described analog intermediate frequency signal the digital signal of two-way intermediate frequency, and the digital signal of described two-way intermediate frequency is carried out to down-conversion to described Digital Down Converter Module and multistage filtering extraction obtains being suitable for the baseband signal that FPGA processes; Described demodulation module carries out demodulation to described baseband signal, and the digital signal after demodulation converts analog signal output to through described D/A modular converter.
The described ultrashort wave number based on software radio framework that the present invention proposes passes in receiving system, and described Digital Down Converter Module comprises: digital controlled oscillator, cic filter, HB filter and FIR filter; Described digital controlled oscillator, it is for generation of the local oscillation signal of discretization, described local oscillation signal respectively with the digital signal of described two-way intermediate frequency through quadrature mixing, the broader frequency spectrum of the digital signal of described two-way intermediate frequency is adjusted to baseband signal, obtain initial baseband signal; Described cic filter carries out high speed filtering extraction to described initial baseband signal, reduces the frequency of described initial baseband signal; The input of described HB filter is connected with the output of described cic filter, for the baseband signal of described cic filter output is carried out to high speed filtering extraction for reducing the frequency of baseband signal, obtains the baseband signal of low frequency; The input of described FIR filter is connected with the output of described HB filter, for the baseband signal of described low frequency is compensated to filtering, obtains baseband signal, realizes shaping and the matched filtering of described baseband signal.
The described ultrashort wave number based on software radio framework that the present invention proposes passes in receiving system, and the extraction factor of described cic filter is 8.
The described ultrashort wave number based on software radio framework that the present invention proposes passes in receiving system, and the extraction factor of described HB filter is 2.
The described ultrashort wave number based on software radio framework that the present invention proposes passes in receiving system, and described demodulation module is 8-level CPFSK demodulation module.
The present invention proposes a kind of ultrashort wave number transmission/reception method based on software radio framework, comprise the steps:
Step 1: receive the high frequency analog signals that send in radio station, described high frequency analog signals is downconverted to analog intermediate frequency signal;
Step 2: described analog intermediate frequency signal is obtained to the digital signal of intermediate frequency through analog-to-digital conversion;
Step 3: the digital signal of described intermediate frequency is carried out to down-conversion and multistage filtering extraction and process and obtain baseband signal;
Step 4: described baseband signal is carried out to demodulation, obtain digital signal;
Step 5: described digital signal is carried out to digital-to-analogue conversion and obtain analog signal, for showing and playing.
In the described ultrashort wave number transmission/reception method based on software radio framework that the present invention proposes, described demodulation mode is 8-level CPFSK demodulation mode.
In the described ultrashort wave number transmission/reception method based on software radio framework that the present invention proposes, in step 3, down-conversion and multistage filtering extraction are processed and are comprised the steps:
Step a: produce local oscillation signal, the digital signal quadrature mixing by described local oscillation signal and described intermediate frequency, is adjusted to baseband signal by the broader frequency spectrum of the digital signal of described intermediate frequency, obtains initial baseband signal;
Step b: utilize cic filter and HB filter successively described initial baseband signal to be carried out to multistage filtering extraction, reduce the frequency of described initial baseband signal, obtain the baseband signal of low frequency;
Step c: the baseband signal of described low frequency is carried out to shaping filter, obtain baseband signal.
In the described ultrashort wave number transmission/reception method based on software radio framework that the present invention proposes, the extraction factor of described cic filter is 8.
In the described ultrashort wave number transmission/reception method based on software radio framework that the present invention proposes, the extraction factor of described HB filter is 2.
The present invention is transformed into traditional hardware based receiving system on the receiver of realizing based on software wireless, reduction development cost and cycle, and simple to operate, simultaneously can also practical function upgrading and timely system update.
The present invention is transformed into traditional hardware based receiving system on the receiver of realizing based on software wireless, reduction development cost and cycle, and simple to operate, simultaneously can also practical function upgrading and timely system update.
The present invention adopts 8-Level CPFSK demodulation mode, overcomes the demodulation mode that traditional receiving system is single, makes information transfer efficiency higher.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention is based on the ultrashort wave number biography receiving system of software radio framework.
Fig. 2 is the structural representation of Digital Down Converter Module.
Fig. 3 a is the oscillogram of cic filter output baseband signal, and Fig. 3 b is the oscillogram of HB filter output baseband signal, and Fig. 3 c is the oscillogram of FIR filter output baseband signal.
Fig. 4 is the flow chart that the present invention is based on the ultrashort wave number transmission/reception method of software radio framework.
Embodiment
In conjunction with following specific embodiments and the drawings, the present invention is described in further detail.Implement process of the present invention, condition, experimental technique etc., except the content of mentioning specially below, be universal knowledege and the common practise of this area, the present invention is not particularly limited content.
The ultrashort wave number that the present invention is based on software radio framework passes receiving system, by access Digital Down Converter Module, high frequency analog signals is converted to the baseband signal that can be processed by FPGA, demodulation module simultaneously of the present invention adopts 8-Level CPFSK demodulation mode, overcome traditional station and can only transmit AM, the single demodulation mode of single sideband demodulation, make transfer of data variation, can not only transmitting voice information, can also transmitting image, the information such as fax, meet the diversified demand of existing transfer of data.
Fig. 1 is the system framework that the present invention is based on the ultrashort wave number biography receiving system of software radio framework.The present invention includes: radio-frequency unit 100 and software radio module 200.The radio signal that radio-frequency unit 100 sends for receiving radio station, and the signal receiving is carried out to down-converted and reduce its frequency and obtain analog intermediate frequency signal.Software radio module 200 is converted to this analog intermediate frequency signal the digital signal of intermediate frequency, and obtain the digital signal for exporting after the digital signal of intermediate frequency is calculated to Digital Down Convert, the processing of multistage filtering extraction and demodulation, this digital signal is carried out generating the analog signal with broadcasting for demonstrations such as display, loud speakers after digital-to-analogue conversion.The present invention can not only receiving speech information, can also receive the information such as image and fax, meets the diversified demand of existing transfer of data.The present invention also can be transformed into traditional hardware based receiving system on the receiver of realizing based on software wireless, reduction development cost and cycle and simple to operate, and simultaneously can also practical function upgrading and timely system update.
Radio-frequency unit 100 comprises receiver module 110 and down conversion module 120, and receiver module 110 is for receiving high frequency analog signals, and down conversion module 120 is for downconverting to analog intermediate frequency signal by high frequency analog signals.Software radio module 200 comprises A/D modular converter 210, Digital Down Converter Module 220, demodulation module 230, D/A modular converter 240.Software radio module 200 all realizes in FPGA, because FPGA has good arithmetic speed, reconfigurability is good, make system of the present invention there is higher processing speed, reception and demodulation are more flexible, not only reduce development cost and cycle and simple to operate, simultaneously can also practical function upgrading and timely system update.
A/D modular converter 210 carries out bandpass sampling by the analog intermediate frequency signal receiving in radio-frequency unit 100, realizes analog intermediate frequency signal to the conversion of the digital signal of intermediate frequency.
As shown in Figure 2, Digital Down Convert signaling module 220 comprises digital controlled oscillator (NCO) 221, cic filter 222, HB filter 223 and FIR filter 224.Digital Down Converter Module 220 is carried out a Digital Down Convert by the digital signal that receives the intermediate frequency of coming in and is produced two-way baseband signal, then by multistage sampling filtering, low-pass filtering, reduce the speed of baseband signal and can obtain good waveform, then the baseband signal obtaining is delivered in demodulation module 230, to carry out demodulation to baseband signal and then send into 240 outputs of D/A modular converter, D/A modular converter 240 can connect computer and other equipment.
Wherein, A/D modular converter 210 carries out bandpass sampling by the analog intermediate frequency signal of radio-frequency unit 100, and this analog intermediate frequency signal is transformed into digital signal.Wherein, the centre frequency f of bandpass sampling
0and the formula between bandwidth B can be expressed as:
F in formula 1
0=(f
h+ f
l)/2, f
srepresent sample frequency, f
hthe highest frequency that represents signal, f
lthe low-limit frequency that represents signal, the value of n meets f
s>=2 (f
h-f
l) maximum integer (0,1,2,3 ...), utilize like this f
scarry out equal interval sampling and obtain sampled signal m (nT
s), just can accurately recover m (t).
The data signal rate of exporting due to A/D modular converter 210 is higher, at analog intermediate frequency signal, is converted to after digital signal, will complete Digital Down Convert to this digital signal and process.Take look-up table as example, calculate in advance the corresponding sine value of each phase place and be stored in advance in ROM, then take phase place as according to directly finding corresponding sine value by look-up table, thereby obtain sine wave, sample.Digital controlled oscillator 221 is to determine one of topmost factor of Digital Down Convert handling property.Consult Fig. 2, in software radio module 200, be provided with a CLK clock signal module 250, CLK clock signal module 250 provides identical clock signal for comprising digital controlled oscillator (NCO) 221, cic filter 222, HB filter 223 and FIR filter 224.
Rising edge or trailing edge at each clock, digital controlled oscillator 221 utilizes its phase accumulator to make phase place increase on the original basis a phase place recruitment, this recruitment is frequency control word, recycle its phase place adder initial phase and the addition of phase place recruitment are obtained to phase deviation, finally utilize phase deviation to find corresponding sine value by look-up table, output two-way sine and cosine local oscillation signal.Wherein, just produce a new circulation when phase accumulator overflows, the time that phase accumulator completes a circulation is the sine-shaped cycle.
The digital signal of A/D modular converter 210 and local oscillation signal, by carrying out quadrature mixing, are obtained to I, the initial baseband signal of Q two-way.Now the frequency of the initial baseband signal of two-way is still the frequency in A/D bandpass sampling, and data transfer rate is high, and the bandwidth of signal is much smaller than sample frequency.In the present embodiment, the IF-FRE of being carried out the analog intermediate frequency signal of bandpass sampling by A/D modular converter 210 is f0=51.2MHz, and the sample frequency of A/D modular converter 210 is fs=49.6MHz, and signal bandwidth is decided to be 10MHz.The centre frequency of the baseband signal that the two-way that therefore, generates after the digital signal of the intermediate frequency of A/D modular converter 210 output and local oscillation signal mixing is initial is 49.6MHz.Because the frequency of the initial baseband signal of two-way is too high, cannot be applicable to the subsequent treatment of FPGA, so two-way baseband signal must reduce through the multistage filtering extraction of Digital Down Converter Module 220 frequency of baseband signal.Repeatedly the arrowband high-frequency signal of filtering extraction in can filtering baseband signal, obtains the low frequency signal containing carrier signal, increases the bandwidth of signal, and reduces the speed of signal, for follow-up FPGA routine processes.
In Digital Down Converter Module 220, cic filter 222 (Cascaded-Integrator-Comb, cascade integral comb filter), as the first order of multistage filtering extraction, can reach very high processing speed and carry out large extraction factor work.In the present embodiment, cic filter 222 can be realized the extraction of 8 times.During n=5 in formula 1, the first level and its main lobe level are 64.8dB, the requirement while meeting filtering extraction work.The initial base-band signal frequency of input cic filter 222 is 49.6MHz, bandwidth is 0.8MHz, in this process, cic filter is realized the extraction of 8 times to the baseband signal of 49.6MHz, output signal frequency is reduced to 5.12MHz, and the waveform of the initial baseband signal of cic filter 222 outputs is referring to Fig. 3 a.
HB filter 223 (half-band filter), as the second level of extracting, is realized the extraction of 2 times, extracts the factor and is fixed as 2, can complete the requirement that sample rate reduces half.In the present embodiment, the frequency of the baseband signal of input HB filter 223 is 5.12MHz, through 2 times of extractions of HB filter 223, the frequency of the baseband signal of the low frequency of output is 2.56MHz, and the waveform of the baseband signal of the low frequency of HB filter 223 outputs is referring to Fig. 3 b.
FIR filter 224, as the third level of multistage extraction, for the compensation filter as Digital Down Convert, to realize the shaping filter to whole channel, also can be used as matched filter.FIR filter 224 does not carry out reduction of speed to baseband signal, and the frequency of the baseband signal of output is still that the waveform of baseband signal of 2.56MHz FIR filter 224 output is referring to Fig. 3 c.
Two-way baseband signal through repeatedly extract with filtering after, obtain the baseband signal for demodulation.Now this baseband signal is delivered to and in demodulation module 230, carried out demodulation, demodulation module 230 is 8-Level CPFSK demodulation module, by 8-Level CPFSK demodulation mode, therefrom obtain corresponding digital signal, in this digital signal, include the data such as image and sound.This digital signal is carried out to digital-to-analogue conversion through D/A modular converter 240, obtain demodulated analog signal.
The present invention is particularly useful for marine traditional communication satellite, shortwave, ultra short wave communication, with respect to short wave channel, ultrashort wave is mainly by direct wave communication, and in Long time scale, its channel parameter can be as being invariable, thus ultra short wave communication more reliably also more simply, more stable; With respect to the good satellite communication of communication, the present invention is simple in structure, and cost is lower.Because ultra short wave communication has stable, simple, communication frequency compared with high, in recent years, in civil area and military domain, be widely used raising.The flexibility of ultra short wave communication just in time meets dispatch control, and the uncertainty of emergency communication place, time and communication form is for example utilized trunking, and ultra short wave communication can cover very wide scope, has brought into play important effect in emergency communication.Therefore, the present invention can be used as the emergent receiving system of operation on the sea ship, can well complete emergency communication.
As shown in Figure 4, the ultrashort wave number transmission/reception method that the present invention is based on software radio framework comprises the steps:
Step 1: receive the high frequency analog signals that send in radio station, high frequency analog signals is downconverted to analog intermediate frequency signal;
Step 2: analog intermediate frequency signal is obtained to the digital signal of intermediate frequency through analog-to-digital conversion;
Step 3: the digital signal of intermediate frequency is carried out to down-conversion and multistage filtering extraction and process and obtain baseband signal;
Step 4: baseband signal is carried out to demodulation, obtain digital signal;
Step 5: digital signal is carried out to digital-to-analogue conversion and obtain analog signal, for showing and playing.Wherein, demodulation mode is 8-level CPFSK demodulation mode.
Further illustrate, in step 3, down-conversion and multistage filtering extraction are processed and are comprised the steps:
Step a: produce local oscillation signal, the digital signal quadrature mixing by local oscillation signal and intermediate frequency, is adjusted to baseband signal by the broader frequency spectrum of the digital signal of intermediate frequency, obtains initial baseband signal;
Step b: utilize cic filter and HB filter successively initial baseband signal to be carried out to multistage filtering extraction, reduce the frequency of initial baseband signal, obtain the baseband signal of low frequency;
Step c: the baseband signal of low frequency is carried out to shaping filter, obtain baseband signal.
In above-described embodiment, the extraction factor of cic filter is that the extraction factor of 8, HB filter is 2.The initial base-band signal frequency of input cic filter 222 is 49.6MHz, and after the multistage filtering extraction of cic filter and HB filter, the base-band signal frequency of output is 2.56MHz successively, is applicable to the processing of rear end FPGA program.
Protection content of the present invention is not limited to above embodiment.Do not deviating under the spirit and scope of inventive concept, variation and advantage that those skilled in the art can expect are all included in the present invention, and take appending claims as protection range.
Claims (10)
1. the ultrashort wave number based on software radio framework passes a receiving system, and it is with software mode, to realize and receive ultrashort wave in FPGA that described ultrashort wave number passes receiving system, it is characterized in that, comprising:
Radio-frequency unit (100), it comprises receiver module (110) and down conversion module (120), described receiver module (110) is for receiving high frequency analog signals, and described down conversion module (120) is for downconverting to analog intermediate frequency signal by described high frequency analog signals;
Software radio module (200), it comprises A/D modular converter (210), Digital Down Converter Module (220), demodulation module (230) and D/A modular converter (240); Described A/D modular converter (210) is converted to described analog intermediate frequency signal the digital signal of two-way intermediate frequency, and the digital signal of described two-way intermediate frequency is carried out to down-conversion to described Digital Down Converter Module (220) and multistage filtering extraction obtains being suitable for the baseband signal that FPGA processes; Described demodulation module (230) carries out demodulation to described baseband signal, and the digital signal after demodulation converts analog signal output to through described D/A modular converter (240).
2. the ultrashort wave number based on software radio framework as claimed in claim 1 passes receiving system, it is characterized in that, described Digital Down Converter Module (220) comprising: digital controlled oscillator (221), cic filter (222), HB filter (223) and FIR filter (224);
Described digital controlled oscillator (221), it is for generation of the local oscillation signal of discretization, described local oscillation signal respectively with the digital signal of described two-way intermediate frequency through quadrature mixing, the broader frequency spectrum of the digital signal of described two-way intermediate frequency is adjusted to baseband signal, obtain initial baseband signal;
Described cic filter (222) carries out high speed filtering extraction to described initial baseband signal, reduces the frequency of described initial baseband signal;
The input of described HB filter (223) is connected with the output of described cic filter (222), for the baseband signal of described cic filter (222) output is carried out to high speed filtering extraction for reducing the frequency of baseband signal, obtain the baseband signal of low frequency;
The input of described FIR filter (224) is connected with the output of described HB filter (223), for the baseband signal of described low frequency is compensated to filtering, obtains baseband signal, realizes shaping and the matched filtering of described baseband signal.
3. the ultrashort wave number based on software radio framework as claimed in claim 2 passes receiving system, it is characterized in that, the extraction factor of described cic filter (222) is 8.
4. the ultrashort wave number based on software radio framework as claimed in claim 2 passes receiving system, it is characterized in that, the extraction factor of described HB filter (223) is 2.
5. the ultrashort wave number based on software radio framework as claimed in claim 1 passes receiving system, it is characterized in that, described demodulation module (230) is 8-level CPFSK demodulation module.
6. the ultrashort wave number transmission/reception method based on software radio framework, is characterized in that, comprises the steps:
Step 1: receive the high frequency analog signals that send in radio station, described high frequency analog signals is downconverted to analog intermediate frequency signal;
Step 2: described analog intermediate frequency signal is obtained to the digital signal of intermediate frequency through analog-to-digital conversion;
Step 3: the digital signal of described intermediate frequency is carried out to down-conversion and multistage filtering extraction and process and obtain baseband signal;
Step 4: described baseband signal is carried out to demodulation, obtain digital signal;
Step 5: described digital signal is carried out to digital-to-analogue conversion and obtain analog signal, for showing and playing.
7. the ultrashort wave number transmission/reception method based on software radio framework as claimed in claim 6, is characterized in that, described demodulation mode is 8-level CPFSK demodulation mode.
8. the ultrashort wave number transmission/reception method based on software radio framework as claimed in claim 6, is characterized in that, in step 3, down-conversion and multistage filtering extraction are processed and comprised the steps:
Step a: produce local oscillation signal, the digital signal quadrature mixing by described local oscillation signal and described intermediate frequency, is adjusted to baseband signal by the broader frequency spectrum of the digital signal of described intermediate frequency, obtains initial baseband signal;
Step b: utilize cic filter and HB filter successively described initial baseband signal to be carried out to multistage filtering extraction, reduce the frequency of described initial baseband signal, obtain the baseband signal of low frequency;
Step c: the baseband signal of described low frequency is carried out to shaping filter, obtain baseband signal.
9. the ultrashort wave number transmission/reception method based on software radio framework as claimed in claim 8, is characterized in that, the extraction factor of described cic filter is 8.
10. the ultrashort wave number transmission/reception method based on software radio framework as claimed in claim 8, is characterized in that, the extraction factor of described HB filter is 2.
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| CN105141338A (en) * | 2015-06-11 | 2015-12-09 | 西安佳中电子技术有限公司 | Ultra-short wave signal digital processing circuit |
| CN106788469A (en) * | 2015-11-23 | 2017-05-31 | 国家电网公司 | A kind of digital intermediate frequency framework of multichannel data radio station |
| CN106411340A (en) * | 2016-09-30 | 2017-02-15 | 金陵科技学院 | Ad-hoc network broadband wireless communication digital receiver |
| CN108111191A (en) * | 2017-12-15 | 2018-06-01 | 广州山锋测控技术有限公司 | Generate the method and apparatus of simulation excitation source signal |
| CN108111191B (en) * | 2017-12-15 | 2020-03-10 | 广州山锋测控技术有限公司 | Method and device for generating simulation excitation source signal |
| CN111699631A (en) * | 2018-02-28 | 2020-09-22 | 代傲表计系统有限公司 | Radio receiver |
| CN108400860A (en) * | 2018-05-09 | 2018-08-14 | 浙江赛威通信技术有限公司 | Distributed channel system and method |
| CN111327334A (en) * | 2018-12-17 | 2020-06-23 | 天津光电通信技术有限公司 | Narrow-band DDC time division multiplexing method based on FPGA |
| CN110995291A (en) * | 2019-12-17 | 2020-04-10 | 云南大学 | Digital down-conversion model based on SDR and design method |
| CN112350765A (en) * | 2020-10-20 | 2021-02-09 | 中国电子科技集团公司第五十四研究所 | Multi-stage full-digital frequency conversion demodulation device based on digital resampling |
| CN112350765B (en) * | 2020-10-20 | 2022-03-22 | 中国电子科技集团公司第五十四研究所 | Multi-stage full-digital frequency conversion demodulation device based on digital resampling |
| CN114900405A (en) * | 2022-03-29 | 2022-08-12 | 电子科技大学 | Acars signal demodulation method based on Soc |
| CN114900405B (en) * | 2022-03-29 | 2023-05-02 | 电子科技大学 | Soc-based Acars signal demodulation method |
| CN115395972A (en) * | 2022-09-05 | 2022-11-25 | 河南普大信息技术有限公司 | Two-stage filtering method |
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