CN106992794A - A kind of software radio system based on band compression - Google Patents
A kind of software radio system based on band compression Download PDFInfo
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- CN106992794A CN106992794A CN201710242105.1A CN201710242105A CN106992794A CN 106992794 A CN106992794 A CN 106992794A CN 201710242105 A CN201710242105 A CN 201710242105A CN 106992794 A CN106992794 A CN 106992794A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Abstract
The invention provides a kind of software radio system based on band compression, it is related to software wireless electrical domain, software radio system of the present invention is in transmitting terminal, modulated signal carries out band compression and modulation after A/D is changed, signal is changed by D/A after modulation, analog signal after conversion is completed by radio-frequency front-end after up-conversion and power amplification to launch, receiving terminal, which is received, enters radio-frequency front-end completion signal amplification and down coversion after signal, and enter A/D conversions, converted signals are demodulated and band recovery after be input to D/A conversions, obtain the signal that transmitting terminal is launched, the present invention using the method for band compression due to can effectively reduce performance requirement of the flexible cord radio to radio frequency front-end devices, and solve broadband signal by radio-frequency front-end distortion it is larger the problem of.
Description
Technical field
The present invention relates to software wireless electrical domain, especially a kind of digital processing software development system.
Background technology
Software and radio technique is a significant innovation to traditional radio communication architecture, and it passes through software mode
The constraint of hardware configuration has been broken away from, has caused software radio the characteristics of its hardware generalization, functional software and Software Component
With very strong flexibility and versatility.At present, software radio has been penetrated into including civilian shifting from the military communications field
Dynamic communication, radar, electronic warfare, observing and controlling, in addition the radio engineering such as television broadcasting every field, but software radio system
Realization not only rely on back-end software design development, while the hardware advances of radio-frequency front-end be also restrict its overall performance
Important limiting factor.
The channel transmitted to adapt to signal in the need of work of unlike signal, software radio system have bandwidth this
One feature, but wide band modulation signal will bring a series of distortions by the amplifier of radio-frequency front-end with frequency mixer, for example：Adjust
Signal processed passes through the frequency mixer with nonlinear characteristic and necessarily brings frequency distortion, produces third order intermodulation, five rank intermodulations, falls and is adjusting
It is difficult to filter out in signal band processed；Radio frequency amplifier can not realize that passband is sufficiently wide, passband ripple is sufficiently small and amplifying power
Interference will be produced a very large impact to modulated signal in the important performance indexes such as sufficiently large, the passband that these problems are brought, and be brought
Irreversible distortion, and be difficult to recover.
How the interference that wide band modulation signal is brought by radio-frequency front-end suppresses to have become the important class of urgent need to resolve
Topic, conventional realizing method is mainly by improving the radio-frequency front-end hardware performance such as amplifier, frequency mixer, and this method is high for price
Expensive complication system still receives, but for Low-cost Aviation (such as SUAV, navigation aircraft etc.) if it is relatively difficult to achieve, it is necessary to
This contradictory problems is solved by improving traditional software radio configuration using other technologies method.
The content of the invention
In order to overcome the deficiencies in the prior art, the interference for overcoming existing software radio radio-frequency front-end distortion to bring is asked
Topic, the present invention proposes a kind of software radio system based on band compression.
Software radio system of the present invention includes transmitting terminal and receiving terminal, and transmitting terminal and receiving terminal include before radio frequency
End part, simulation numeral (Analog to digital, A/D) conversion portion and digital simulation (Digital to analogue,
D/A) conversion portion and numerical portion, in the transmitting terminal of software radio system, modulated signal will after A/D conversion portions
Analog signal is converted into data signal, and data signal is modulated into numerical portion, and signal passes through D/A conversion portions after modulation
Afterwards, data signal is converted to analog signal, and the analog signal after conversion is completed into up-conversion and power amplification by radio-frequency front-end
Afterwards, signal is launched by antenna；The analog signal that the antenna receiving end/sending end of receiving terminal is sent in software radio system, simulation
Signal enters radio-frequency front-end and completes signal amplification and down coversion, and enters A/D conversion portions by signal digits after conversion signal, number
Word signal is after numerical portion is demodulated, then it is analog signal, the mould received to be input to D/A conversion portions by digital signal conversion
It is the signal that transmitting terminal is launched to intend signal；
The numerical portion of the transmitting terminal, is filtered, filtered signal f (t) passes through first after data signal entrance
Band compression, i.e., be changed to t/a by the variable t in f (t), the signal f (t/a) after band compression is obtained, by the letter after band compression
Number f (t/a) is modulated, and is output to after Digital Up Convert and channel filtering D/A conversion portions；
The numerical portion of the receiving terminal, the signal after the conversion of A/D conversion portions carries out channel filtering sum first
Word down coversion, the signal after Digital Down Convert is demodulated, and signal is f (t/a) after demodulation, and its variable t/a is changed into t, produced
Signal f (t) after to band recovery, f (t) enter D/A conversion portions afterwards after filtering.
The numerical portion of transmitting terminal of the present invention can remove filtering, Digital Up Convert and channel filtering, A/D conversion portions
Data signal after conversion carries out data signal to mould merely through D/A conversion portions are directly output to after band compression and modulation
Intend the conversion of signal.
The numerical portion of receiving terminal of the present invention can remove channel filtering, Digital Down Convert and filtering, A/D conversion portions
Data signal after conversion carries out data signal to mould merely through D/A conversion portions are directly output to after demodulation band recovery
Intend the conversion of signal.
The beneficial effects of the invention are as follows it can effectively reduce flexible cord radio to radio frequency due to the method using band compression before
The performance requirement of end-apparatus part, and solve broadband signal by radio-frequency front-end distortion it is larger the problem of, the income bag of acquisition
Include：One is the reduction of the band bandwidth of signal, the part even more than ten that it accounts for original signal bandwidth in channel
/ mono-, the channel in soft radio applications is integrated and proposes new approaches；Two be for the modulated signal after band compression
When radio-frequency front-end is amplified, substantially reduced for the performance requirement of amplifier, frequency domain distortion phenomenon has obtained very big improvement；
Three be that algorithm model can realize modularization making in software radio numerical portion, using flexible and with low cost, meets soft
Part radio thought；Four be with communication information privacy functions, with potential extensive use.
Brief description of the drawings
Fig. 1 is the annexation schematic diagram of each module of existing transmitting terminal.
Fig. 2 is the annexation schematic diagram of each module of existing receiving terminal.
Fig. 3 is transmitting terminal and the annexation schematic diagram of each functional module of receiving terminal in the present invention.
Fig. 4 is the flow chart of the present invention.
Fig. 5 is the time-frequency domain oscillogram of square-wave signal, wherein, Fig. 5 (a) is the time domain waveform of square-wave signal, and Fig. 5 (b) is
The frequency-domain waveform of square-wave signal.
Fig. 6 is the time-frequency domain oscillogram of square-wave signal signal after band compression, wherein, after Fig. 6 (a) is band compression
Time domain waveform, Fig. 6 (b) is the frequency-domain waveform after band compression.
Fig. 7 be that signal after band compression is amplitude modulated and amplifier after time domain beamformer.
Fig. 8 is the time-frequency domain oscillogram after receiving terminal demodulation and band recovery, wherein, Fig. 8 (a) is demodulation and band recovery
The time domain waveform of square wave afterwards, Fig. 8 (b) is the frequency-domain waveform of square wave after demodulation and band recovery.
Embodiment
The present invention is further described with reference to the accompanying drawings and examples.
Software radio system of the present invention includes transmitting terminal and receiving terminal, and transmitting terminal and receiving terminal include before radio frequency
End part, Analog-digital Converter (Analog to digital, A/D) partly with digital-to-analogue conversion (Digital to
Analogue, D/A) part and numerical portion, in software radio system in transmitting terminal, modulated signal pass through A/D converter sections
Analog signal is converted into data signal after point, data signal is modulated into numerical portion, signal is turned by D/A after modulation
Change behind part, data signal is converted to analog signal, the analog signal after conversion is completed into up-conversion and work(by radio-frequency front-end
Rate is amplified, and signal is launched by antenna；The analog signal that the antenna receiving end/sending end of receiving terminal is sent in software radio system,
Signal amplification and down coversion are completed into radio-frequency front-end, and enters A/D conversion portions by signal digits after conversion signal, numeral letter
Number after numerical portion is demodulated, then it is analog signal to be input to D/A conversion portions by digital signal conversion, the simulation letter received
Number i.e. signal launched of transmitting terminal.
The numerical portion of the transmitting terminal, is filtered, filtered signal f (t) passes through first after data signal entrance
Band compression, i.e., be changed to t/a by the variable t in f (t), obtains the signal f (t/a) after band compression, F is shown as in a frequency domain
(ω) arrives F (a ω) change, realizes band compression, the signal f (t/a) after band compression is modulated, and by numerically
D/A conversion portions are output to after frequency conversion and channel filtering；
The numerical portion of the receiving terminal, the signal after the conversion of A/D conversion portions carries out channel filtering sum first
Word down coversion, the signal after Digital Down Convert is demodulated, and signal is f (t/a) after demodulation, and its variable t/a is changed into t, produced
Signal f (t) after to band recovery, f (t) are the square-wave signal before band compression, that is, software radio system institute in itself
The square-wave signal to be launched, shows as the change that F (a ω) arrives F (ω) in a frequency domain, realizes band recovery, i.e. receiving terminal and passes through
Crossing f (t/a) → f (t) process realizes the band recovery of signal, has recovered original square-wave signal, f (t) after filtering after
Into D/A conversion portions.
The numerical portion of transmitting terminal of the present invention removes filtering, Digital Up Convert and channel filtering, and A/D conversion portions turn
Data signal after changing carries out data signal to simulation merely through D/A conversion portions are directly output to after band compression and modulation
The conversion of signal.
In the numerical portion of receiving terminal of the present invention, channel filtering, Digital Down Convert and filtering, A/D converter sections are removed
The data signal divided after conversion carries out data signal and arrived merely through D/A conversion portions are directly output to after demodulation band recovery
The conversion of analog signal.
As depicted in figs. 1 and 2, it is the annexation schematic diagram of current existing each module of transmitting terminal and receiving terminal, this hair
Each function block process figure with band compression function is as shown in figure 3, wherein, numerical portion transmitting terminal according to demand may be used in bright
To remove filtering, Digital Up Convert and channel filtering, numerical portion receiving terminal can be removed under channel filtering, numeral according to demand
Dotted line module can be removed in frequency conversion and filtering, Fig. 1, Fig. 2 and Fig. 3.
Implementing procedure of the present invention is as shown in figure 4, Fig. 5 is the time-frequency domain oscillogram of original square-wave signal, and wherein Fig. 5 (a) is
Time domain signal waveform, Fig. 5 (b) is frequency-region signal waveform, and Fig. 5 (a) sees that the original square wave signal period is for 0.1ms, i.e. frequency
10kHz (1/0.1ms=10kHz), to obtaining square-wave signal after compression as shown in Figure 6 after Fig. 5 signal progress band compression
Waveform and frequency spectrum, wherein, Fig. 6 (a) is the time domain waveform after band compression, and Fig. 6 (b) is the frequency-domain waveform after band compression, is led to
Cross Fig. 6 (a) and find out that the square wave signal period is that 0.5ms, i.e. frequency are changed into 2kHz (1/0.5ms=2kHz) after band compression, compress
5 times, contrasted by Fig. 6 (b) and Fig. 5 (b) it can be seen that narrow by frequency band after band compression, then will signal progress after compression
Amplitude modulation(PAM), and the signal waveform launched by amplifier is as shown in fig. 7, antenna is received after signal, is carried out width
Degree demodulation and band recovery are that can obtain the waveform and frequency spectrum of square-wave signal as described in Figure 8, wherein, Fig. 8 (a) is demodulation and frequency band
The time domain waveform of square wave after recovery, Fig. 8 (b) is square-wave signal in the frequency-domain waveform of square wave after demodulation and band recovery, Fig. 8 (a)
Cycle is 0.1ms, and its frequency is 10kHz (1/0.1ms=10kHz), identical with original square-wave signal in Fig. 5 (a), passes through Fig. 8
(b) contrast is carried out with Fig. 5 (b) as can be seen that two figures do not have difference in signal frequency, i.e., by being got back after band recovery
Original square-wave signal.
Claims (2)
1. a kind of software radio system based on band compression, including transmitting terminal and receiving terminal, it is characterised in that：
The transmitting terminal and receiving terminal include RF front-end part, A/D conversion portions and D/A conversion portions and numerical portion,
In the transmitting terminal of software radio system, analog signal is converted into data signal by modulated signal after A/D conversion portions,
Data signal is modulated into numerical portion, after signal is by D/A conversion portions after modulation, and data signal is converted to simulation letter
Number, the analog signal after conversion is completed after up-conversion and power amplification by radio-frequency front-end, signal is launched by antenna；Software
The analog signal that the antenna receiving end/sending end of receiving terminal is sent in radio system, analog signal enters radio-frequency front-end and completes signal
Amplification and down coversion, and enter A/D conversion portions by signal digits after conversion signal, data signal is demodulated by numerical portion
Afterwards, then be input to D/A conversion portions by digital signal conversion be analog signal, what the analog signal received i.e. transmitting terminal was launched
Signal；
The numerical portion of the transmitting terminal, is filtered, filtered signal f (t) passes through frequency band first after data signal entrance
Compression, i.e., be changed to t/a by the variable t in f (t), obtain the signal f (t/a) after band compression, by the signal f after band compression
(t/a) it is modulated, and is output to after Digital Up Convert and channel filtering D/A conversion portions；
The numerical portion of the receiving terminal, the signal after the conversion of A/D conversion portions is carried out under channel filtering and numeral first
Frequency conversion, the signal after Digital Down Convert is demodulated, and signal is f (t/a) after demodulation, and its variable t/a is changed into t, that is, obtains frequency
With the signal f (t) after recovering, f (t) enters D/A conversion portions afterwards after filtering.
2. the software radio system according to claim 1 based on band compression, it is characterised in that：
The numerical portion of the transmitting terminal can remove filtering, Digital Up Convert and channel filtering, the number after the conversion of A/D conversion portions
Word signal carries out data signal turning to analog signal merely through D/A conversion portions are directly output to after band compression and modulation
Change；
The numerical portion of the receiving terminal can remove channel filtering, Digital Down Convert and filtering, the number after the conversion of A/D conversion portions
Word signal carries out data signal turning to analog signal merely through D/A conversion portions are directly output to after demodulation band recovery
Change.
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| CN201710242105.1A CN106992794B (en) | 2017-04-14 | 2017-04-14 | A kind of software radio system based on band compression |
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| CN201710242105.1A CN106992794B (en) | 2017-04-14 | 2017-04-14 | A kind of software radio system based on band compression |
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| CN106992794A true CN106992794A (en) | 2017-07-28 |
| CN106992794B CN106992794B (en) | 2019-08-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111835367A (en) * | 2019-04-11 | 2020-10-27 | 华为技术有限公司 | Signal processing chip and communication device |
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|---|---|---|---|---|
| CN1218338A (en) * | 1997-11-20 | 1999-06-02 | 刘晓冰 | Method for compression of signal transmission frequency bands |
| CN1220526A (en) * | 1997-12-15 | 1999-06-23 | 郭旭明 | Frenquency band compression and data compression technology |
| CN105207966A (en) * | 2015-08-10 | 2015-12-30 | 中国民航大学 | Compressed sensing PIE (Pulse Interference Elimination) system based on space-frequency coding |
| CN105515711A (en) * | 2015-12-25 | 2016-04-20 | 中国民航大学 | Compression sensing and reception diversity combined range finder interference suppression system |
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2017
- 2017-04-14 CN CN201710242105.1A patent/CN106992794B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1218338A (en) * | 1997-11-20 | 1999-06-02 | 刘晓冰 | Method for compression of signal transmission frequency bands |
| CN1220526A (en) * | 1997-12-15 | 1999-06-23 | 郭旭明 | Frenquency band compression and data compression technology |
| CN105207966A (en) * | 2015-08-10 | 2015-12-30 | 中国民航大学 | Compressed sensing PIE (Pulse Interference Elimination) system based on space-frequency coding |
| CN105515711A (en) * | 2015-12-25 | 2016-04-20 | 中国民航大学 | Compression sensing and reception diversity combined range finder interference suppression system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111835367A (en) * | 2019-04-11 | 2020-10-27 | 华为技术有限公司 | Signal processing chip and communication device |
| CN111835367B (en) * | 2019-04-11 | 2022-04-22 | 华为技术有限公司 | Signal processing chip and communication device |
| US11955996B2 (en) | 2019-04-11 | 2024-04-09 | Huawei Technologies Co., Ltd. | Signal processing chip and communications device |
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| CN106992794B (en) | 2019-08-09 |
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