CN105791191A - Method for realizing high-speed data communication for wireless narrowband, communication system of wireless narrow band and modem of wireless narrow band - Google Patents
Method for realizing high-speed data communication for wireless narrowband, communication system of wireless narrow band and modem of wireless narrow band Download PDFInfo
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Abstract
The invention discloses a method for realizing high-speed data communication for a wireless narrowband. The method comprises the following steps: carrying out channel encoding on to-be-sent data; carrying out digital modulation on a code element; modulating a signal after the digital modulation into a low frequency carrier signal; modulating the modulated low frequency carrier signal into a radio frequency carrier signal, carrying out power amplification on the radio frequency carrier signal and sending the radio frequency carrier signal; receiving the modulated radio frequency carrier signal; demodulating the modulated radio frequency carrier signal to recover the low frequency carrier signal modulated by the signal after the digital modulation; demodulating the low frequency carrier signal modulated by the signal subjected to the digital modulation to recover the signal subjected to the digital modulation; carrying out digital demodulation on the digital modulation signal to obtain the code element; and carrying out channel decoding on the code element to obtain data. The invention further discloses a wireless narrowband data communication system and a wireless narrowband modem. According to the method disclosed by the invention, the digital modulation signal with a relatively large bandwidth is transferred onto the low frequency carrier signal with relatively low frequency, so the data transmission rate is improved without increasing the occupied bandwidth.
Description
Technical field
The present invention relates to communication technology, particularly relate to wireless arrowband and realize method and communication system, the modem of high-speed data communication.
Background technology
Digital modulation is widely used in narrowband wireless communication, and the mode of digital modulation has a variety of, such as QAM modulation, MSK modulation, GMSK modulation, QPSK modulation, nlevel-FSK modulation etc..Along with constantly increasing of transfer rate, its baseband rate also and then increases, and required transmission band also beyond the scope (bandwidth in wireless narrow-band FM radio station--for 25KHz) of arrowband defined, finally makes speed and bandwidth become the contradiction in narrowband wireless communication.For quadrature amplitude modulation (QAM), it represents different coding with amplitude and the phase place of carrier signal, and multi-system is combined with quadrature carrier technology, improves the utilization rate of frequency band.If directly using QAM modulation in RFDC, its reference frequency and bandwidth are all higher than the permissible value in wireless narrow-band FM radio station；Additionally, QAM is linear modulation, and the radio-frequency (RF) power amplification of wireless digital broadcasting station is nonlinear device, therefore can cause that qam signal produces the distortion of amplitude and phase place, cause error code, if adopting powerful linear radio-frequency power amplifier, can cause high cost.
Summary of the invention
The technical problem to be solved is in that to provide a kind of method realizing high-speed data communication under not changing the premise of bandwidth of wireless arrowband.
Another technical problem to be solved by this invention is in that to provide a kind of wireless narrowband data communication system.
Another technical problem to be solved by this invention is in that to provide a kind of wireless narrow-band modem.
For solving above-mentioned technical problem, the technical solution adopted in the present invention is:
A kind of method that wireless arrowband realizes high-speed data communication, including:
Data to be sent are carried out chnnel coding, obtains code element；
Described code element is carried out digital modulation；
Signal after digital modulation is modulated a low frequency carrier signal；
Modulated low frequency carrier signal is modulated a radio-frequency carrier signal, is sent by transmitting antenna after then carrying out power amplification；
Modulated radio-frequency carrier signal is received by reception antenna；
The modulated radio-frequency carrier signal that demodulation receives, recovers the low frequency carrier signal of the modulation of the signal after by digital modulation；
Demodulate the low frequency carrier signal modulated by the signal after digital modulation, recover the signal of digital modulation；
The signal of digital modulation is carried out digital demodulation, obtains code element；
The code element obtained after digital demodulation is carried out channel decoding, obtains data.
Present invention also offers a kind of wireless narrowband data communication system, including discharger and reception device；
Described discharger includes the first baseband processing module, modulation treatment module, the first radio frequency processing module and transmitting antenna；First baseband processing module, for data to be sent are carried out chnnel coding, obtains code element；Modulation treatment module electrically connects with the first described baseband processing module, for code element carries out digital modulation, and the signal after digital modulation is modulated a low frequency carrier signal；First radio frequency processing module electrically connects with modulation treatment module, for modulated low frequency carrier signal is modulated a radio-frequency carrier signal, is sent by described transmitting antenna after then carrying out power amplification；
Described reception device includes the second baseband processing module, demodulation process module, the second radio frequency processing module and reception antenna；Second radio frequency processing module, for receiving modulated radio-frequency carrier signal, the modulated radio-frequency carrier signal that demodulation receives from described reception antenna, recovers the low frequency carrier signal of the modulation of the signal after by digital modulation；Demodulation process module electrically connects with the second described radio frequency processing module, for demodulating the low frequency carrier signal of the modulation of the signal after by digital modulation, recovers the signal of digital modulation, and the signal of digital modulation is carried out digital demodulation, obtain code element；Second baseband processing module electrically connects with demodulation process module, for the code element obtained after digital demodulation is carried out channel decoding, obtains data.
Present invention also offers a kind of wireless narrow-band modem, including data interface module, baseband processing module, digital signal processing module and modulus and D/A converter module；
Data interface module is for carrying out data exchange with outside data source；
Baseband processing module is two-way with described data interface module and digital signal processing module respectively to be electrically connected, for the data from data interface module are carried out chnnel coding, obtain code element, the code element obtained is sent to described digital signal processing module, and the code element from digital signal processing module is carried out channel decoding, obtain data, the data obtained are sent to data interface module；
Digital signal processing module is two-way with modulus and D/A converter module to be electrically connected, for the code element from baseband processing module is carried out digital modulation, and the signal after digital modulation is modulated a low frequency carrier signal, modulated low frequency carrier signal is sent to modulus and D/A converter module, and the low frequency carrier signal modulated by the signal after digital modulation from modulus and D/A converter module is demodulated, recover the signal of digital modulation, and the signal of this digital modulation is carried out digital demodulation, obtain code element, the code element obtained is sent to baseband processing module；
Modulus and D/A converter module are two-way with the radio-frequency module of outside to be electrically connected, for being sent to external radio frequency module after the modulated low frequency carrier signal from digital signal processing module is carried out digital-to-analogue conversion, and by from external radio frequency module by after digital modulation signal modulate low frequency carrier signal carry out analog digital conversion after be sent to digital signal processing module.
After adopting technique scheme, the present invention has the advantage that
1, the digital modulation signals of broader bandwidth is moved on the low frequency carrier signal of lower frequency by the present invention, thus have compressed the bandwidth of signal, narrow-band FM radio station is enable correctly baseband signal to be transmitted, will not be filtered out because bandwidth exceedes narrow-band FM radio station filter range, the raising of message transmission rate is achieved under the premise not increasing occupied bandwidth, the data transmission efficiency more than 9.6Kbps can be realized, even up to 64Kbps；
2, adopt the present invention can solve QAM modulation and utilize the contradiction of nonlinear power amplifier.Baseband signal has changed its original linear relationship after twice modulation, therefore need not the very high radio-frequency (RF) power amplification of the linearity, will not be non-linear radio frequency power amplifier because of what narrow-band FM radio station adopted and produce bigger error code.
Accompanying drawing explanation
Fig. 1 is the theory diagram of wireless according to an embodiment of the invention narrowband data communication system.
Fig. 2 is the theory diagram of wireless narrow-band modem according to an embodiment of the invention.
Fig. 3 is that wireless narrow-band modem and the radio-frequency module that is connected with this wireless narrow-band modem carry out the fundamental diagram of secondary modulation according to an embodiment of the invention.
Detailed description of the invention
Below in conjunction with accompanying drawing the present invention made and further illustrating.
The method that a kind of according to an embodiment of the invention wireless arrowband realizes high-speed data communication, including launching the step of transmitting a of the multicarrier communication signal being loaded with data signal and receiving the receiving step b at the step of transmitting a multicarrier communication signal being loaded with data signal launched.
Step of transmitting a comprises the following steps:
A1, data to be sent are carried out chnnel coding, obtain code element；Above-mentioned chnnel coding includes carrying out Error Correction of Coding and intertexture to sent data, and wherein, Error Correction of Coding can adopt RS to encode；
A2, described code element is carried out digital modulation；This digital modulation is QAM modulation, MSK modulation, GMSK modulation, QPSK modulation or nlevel-FSK modulation；
A3, the signal after digital modulation being modulated a low frequency carrier signal, the frequency f1 of this low frequency carrier signal meets: 0≤f1≤10KHz；
A4, modulated low frequency carrier signal is modulated a radio-frequency carrier signal, sent by transmitting antenna after then carrying out power amplification.
Receiving step b comprises the following steps:
B1, receive modulated radio-frequency carrier signal by reception antenna；
The modulated radio-frequency carrier signal that b2, demodulation receive, recovers the low frequency carrier signal of the modulation of the signal after by digital modulation；This demodulating process can have the signal of same frequency with above-mentioned radio-frequency carrier signal and carry out being mixed realizing with modulated radio-frequency carrier signal by adopting；
The low frequency carrier signal that b3, demodulation are modulated by the signal after digital modulation, recovers the signal of digital modulation；This demodulating process can have the signal of same frequency by employing and above-mentioned low frequency carrier signal carry out being mixed realizing with being somebody's turn to do the low frequency carrier signal modulated by the signal after digital modulation；
B4, signal to digital modulation carry out digital demodulation, obtain code element；
B5, the code element obtained after digital demodulation is carried out channel decoding, obtain data；This channel decoding includes removing the error correcting code of redundancy and deinterleaving.
Low frequency modulations can be realized by the hardware such as audion, field effect transistor, it is also possible to is realized by FPGA or DSP.If realizing low frequency modulations with FPGA or DSP, in a3 step, modulated low frequency carrier signal after digital-to-analogue conversion, then need to remove the radio-frequency carrier signal described in modulation；And if low frequency modulations is realized by the hardware such as audion, field effect transistor, then there is no the step of follow-up digital-to-analogue conversion.Similarly, if low frequency demodulation is to be realized by FPGA or DSP, before the low frequency carrier signal that demodulation is modulated by the signal after low frequency modulations, first the low frequency carrier signal modulated by the signal after low frequency modulations recovered is carried out analog digital conversion.
As it is shown in figure 1, present invention also offers a kind of wireless narrowband data communication system realizing said method, it includes discharger and receives device.
Discharger includes the first baseband processing module 11, modulation treatment module the 12, first radio frequency processing module 13 and transmitting antenna 14.First baseband processing module 11, for data to be sent are carried out chnnel coding, obtains code element；Above-mentioned chnnel coding includes carrying out Error Correction of Coding and intertexture to sent data, and wherein, Error Correction of Coding can adopt RS to encode.Modulation treatment module 12 electrically connects with the first baseband processing module 11, for described code element carries out digital modulation, and the signal after digital modulation is modulated a low frequency carrier signal.This digital modulation is QAM modulation, MSK modulation, GMSK modulation, QPSK modulation or nlevel-FSK modulation, and the frequency f1 of this low frequency carrier signal meets: 0≤f1≤10KHz.First radio frequency processing module 13 electrically connects with modulation treatment module 12, for modulated low frequency carrier signal is modulated a radio-frequency carrier signal, is sent by transmitting antenna 14 after then carrying out power amplification.
Receive device and include the second baseband processing module 21, demodulation process module the 22, second radio frequency processing module 23 and reception antenna 24.Second radio frequency processing module 21, for receiving modulated radio-frequency carrier signal, the modulated radio-frequency carrier signal that demodulation receives from reception antenna 24, recovers the low frequency carrier signal of the modulation of the signal after by digital modulation.Demodulation process module 22 electrically connects with the second radio frequency processing module 23, demodulates the low frequency carrier signal modulated by the signal after digital modulation, recovers the signal of digital modulation, and the signal of digital modulation is carried out digital demodulation, obtain code element.Second baseband processing module 21 electrically connects with demodulation process module 22, for the code element obtained after digital demodulation is carried out channel decoding, obtains data.
Refer to Fig. 2.A kind of according to an embodiment of the invention wireless narrow-band modem 3 includes data interface module 31, baseband processing module 32, digital signal processing module 33 and modulus and D/A converter module 34.
Data interface module 31 is for carrying out data exchange with outside data source 4, and the exchange of these data includes insulation blocking and the level translation of inside and outside circuit.
Baseband processing module 32 respectively with data interface module 31 and digital signal processing module 33 is two-way electrically connects.Baseband processing module 32 is for carrying out chnnel coding by the data from data interface module, obtain code element, the code element obtained is sent to described digital signal processing module, and the code element from digital signal processing module 33 is carried out channel decoding, obtain data, the data obtained are sent to data interface module.
In a specific embodiment, after the first data signal from data interface module 31 is included the fundamental optimum of stabilization, shaping by baseband processing module 32, it is encoded calculating to the first data obtained, generate the first error correcting code of redundancy, again the first data and the first error correcting code are interleaved, the second data after intertexture, according to mapping relations generated code metasymbol, are then forwarded to digital signal processing module 33.And, baseband processing module 31 is also to symbol reverse generation the 3rd data from digital signal processing module 33, and the 3rd data signal is screened, deinterleaved, reverse generation the 4th data and the second error correcting code, calculate the accuracy of the 4th data by the second error correcting code and correct the error code repaired in the 4th data, recover the original series of the 4th data, and be forwarded to data interface module 21.
Digital signal processing module 33 and modulus and D/A converter module 34 is two-way electrically connects, for the code element from baseband processing module 31 is carried out digital modulation, and the signal after digital modulation is modulated a low frequency carrier signal, modulated low frequency carrier signal is sent to modulus and D/A converter module 34, and the low frequency carrier signal modulated by the signal after digital modulation from modulus and D/A converter module 34 is demodulated, recover the signal of digital modulation, and the signal of this digital modulation is carried out digital demodulation, obtain code element, the code element obtained is sent to baseband processing module 31.
Modulus and D/A converter module 34 are two-way with the radio-frequency module 5 of outside to be electrically connected, for being sent to external radio frequency module 5 after the modulated low frequency carrier signal from digital signal processing module 33 is carried out digital-to-analogue conversion, and by from external radio frequency module 5 by after digital modulation signal modulate low frequency carrier signal carry out analog digital conversion after be sent to digital signal processing module 33.
Refer to Fig. 3.In a specific embodiment, digital signal processing module 33 carries out QAM modulation (preferred 16-QAM modulation) according to the symbol that baseband processing module 32 produces, again the signal (the first signal) of QAM modulation is modulated on a relatively low sound carrier (secondary signal) of frequency, namely produce new low-frequency modulation signal (the 3rd signal) with the mixing of this audio signal.The frequency f1 of this sound carrier meets: 0≤f1≤10KHz, it is preferable that f1=3KHz.The QAM signal of upper frequency is moved in the audio signal of a lower frequency by this process.Then pass through modulus and D/A converter module 34 forms the actual waveform modulating signal, sent by external radio frequency mould 5.Modulated audio carrier signal is modulated a radio-frequency carrier signal by external radio frequency module 5, is sent by transmitting antenna after then carrying out power amplification.Digital signal processing module 33 is really the width phase secondary modulation completing frequency modulation/quadrature amplitude modulation.Demodulated signal data from modulus and D/A converter module 34 is also mixed by digital signal processing module 33 by secondary signal, recover the signal (the 4th signal) of QAM modulation, the signal of QAM modulation is demodulated producing symbol again, and is forwarded to baseband processing module 32.This digital signal processing module 33 can be made up of FPGA or DSP.
Claims (10)
1. the method that a wireless arrowband realizes high-speed data communication, it is characterised in that including:
Data to be sent are carried out chnnel coding, obtains code element；
Described code element is carried out digital modulation；
Signal after digital modulation is modulated a low frequency carrier signal；
Modulated low frequency carrier signal is modulated a radio-frequency carrier signal, is sent by transmitting antenna after then carrying out power amplification；
Modulated radio-frequency carrier signal is received by reception antenna；
The modulated radio-frequency carrier signal that demodulation receives, recovers the low frequency carrier signal of the modulation of the signal after by digital modulation；
Demodulate the low frequency carrier signal modulated by the signal after digital modulation, recover the signal of digital modulation；
The signal of digital modulation is carried out digital demodulation, obtains code element；
The code element obtained after digital demodulation is carried out channel decoding, obtains data.
2. the method that a kind of wireless arrowband as claimed in claim 1 realizes high-speed data communication, it is characterised in that the frequency f1 of described low frequency carrier signal meets: 0≤f1≤10KHz.
3. the method that a kind of wireless arrowband as claimed in claim 1 realizes high-speed data communication, it is characterised in that described digital modulation is QAM modulation, MSK modulation, GMSK modulation, QPSK modulation or nlevel-FSK modulation.
4. the method that a kind of wireless arrowband as described in claim 1 or 3 realizes high-speed data communication, it is characterized in that, described digital modulation is to be realized by FPGA or DSP, modulated low frequency carrier signal radio-frequency carrier signal described in re-modulation after digital-to-analogue conversion；
Described digital demodulation is to be realized by FPGA or DSP, before the low frequency carrier signal that demodulation is modulated by the signal after digital modulation, first the low frequency carrier signal modulated by the signal after digital modulation recovered is carried out analog digital conversion.
5. the method that a kind of wireless arrowband as claimed in claim 1 realizes high-speed data communication, it is characterised in that described chnnel coding includes carrying out Error Correction of Coding and intertexture to sent data.
6. a wireless narrowband data communication system, it is characterised in that include discharger and receive device；
Described discharger includes the first baseband processing module, modulation treatment module, the first radio frequency processing module and transmitting antenna；
The first described baseband processing module, for data to be sent are carried out chnnel coding, obtains code element；
Described modulation treatment module electrically connects with the first described baseband processing module, for described code element carries out digital modulation, and the signal after digital modulation is modulated a low frequency carrier signal；
The first described radio frequency processing module electrically connects with described modulation treatment module, for modulated low frequency carrier signal is modulated a radio-frequency carrier signal, is sent by described transmitting antenna after then carrying out power amplification；
Described reception device includes the second baseband processing module, demodulation process module, the second radio frequency processing module and reception antenna；
The second described radio frequency processing module, for receiving modulated radio-frequency carrier signal, the modulated radio-frequency carrier signal that demodulation receives from described reception antenna, recovers the low frequency carrier signal of the modulation of the signal after by digital modulation；
Described demodulation process module electrically connects with the second described radio frequency processing module, for demodulating the low frequency carrier signal of the modulation of the signal after by digital modulation, recovers the signal of digital modulation, and the signal of digital modulation is carried out digital demodulation, obtain code element；
The second described baseband processing module electrically connects with described demodulation process module, for the code element obtained after digital demodulation is carried out channel decoding, obtains data.
7. a kind of wireless narrowband data communication system as claimed in claim 6, it is characterised in that the frequency f1 of described low frequency carrier signal meets: 0≤f1≤10KHz.
8. a kind of wireless narrowband data communication system as claimed in claim 6, it is characterised in that described digital modulation is QAM modulation, MSK modulation, GMSK modulation, QPSK modulation or nlevel-FSK modulation.
9. a wireless narrow-band modem, it is characterised in that include data interface module, baseband processing module, digital signal processing module and modulus and D/A converter module；
Described data interface module is for carrying out data exchange with outside data source；
Described baseband processing module respectively with described data interface module and described digital signal processing module is two-way electrically connects, for the data from data interface module are carried out chnnel coding, obtain code element, the code element obtained is sent to described digital signal processing module, and the code element from digital signal processing module is carried out channel decoding, obtain data, the data obtained are sent to data interface module；
Described digital signal processing module is two-way with described modulus and D/A converter module to be electrically connected, for the code element from baseband processing module is carried out digital modulation, and the signal after digital modulation is modulated a low frequency carrier signal, modulated low frequency carrier signal is sent to modulus and D/A converter module, and the low frequency carrier signal modulated by the signal after digital modulation from modulus and D/A converter module is demodulated, recover the signal of digital modulation, and the signal of this digital modulation is carried out digital demodulation, obtain code element, the code element obtained is sent to baseband processing module；
Described modulus and D/A converter module are two-way with the radio-frequency module of outside to be electrically connected, for being sent to external radio frequency module after the modulated low frequency carrier signal from digital signal processing module is carried out digital-to-analogue conversion, and by from external radio frequency module by after digital modulation signal modulate low frequency carrier signal carry out analog digital conversion after be sent to digital signal processing module.
10. a kind of wireless narrow-band modem as claimed in claim 9, it is characterised in that the frequency f1 of described low frequency carrier signal meets: 0≤f1≤10KHz；
Described digital modulation is QAM modulation.
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| CN113194052A (en) * | 2021-04-01 | 2021-07-30 | 上海交通大学 | Reconfigurable radio frequency direct digital modulation communication system |
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