CN104092637B - Short range digital modem communication method based on computer sound card - Google Patents
Short range digital modem communication method based on computer sound card Download PDFInfo
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- CN104092637B CN104092637B CN201410315172.8A CN201410315172A CN104092637B CN 104092637 B CN104092637 B CN 104092637B CN 201410315172 A CN201410315172 A CN 201410315172A CN 104092637 B CN104092637 B CN 104092637B
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Abstract
The present invention relates to a kind of short range digital modem communication method based on computer sound card, this method includes：Transmitting terminal computer generates valid data and two sections of targeting sequencings, and is modulated and is molded respectively；Valid data combine framing structure with targeting sequencing, and targeting sequencing is located at valid data front end；The frame structure of acquisition is handled by Digital Up Convert, then realizes digital-to-analogue conversion by computer sound card, and the analog signal after conversion is sent by sending station；Receive radio station and receive analog signal, computer sound card carries out analog-to-digital conversion to analog signal, and the data signal after conversion reverts to complex signal by Digital Down Convert processing；Frame synchronization, offset estimation processing are carried out to complex signal, obtains the frequency shift (FS) of targeting sequencing；The demodulated processing of signal after frequency offset correction obtains effective information.Compared with prior art, the present invention solve thes problems, such as that short wave communication is unstable, the strong caused receiving signal demodulation failure of noise jamming.
Description
Technical field
The present invention relates to wireless communication technology field, is specifically related to a kind of short range digital modulation based on computer sound card
Demodulate communication means.
Background technology
Short wave communication is the radio communication system that frequency is 3-30MHz, has that using flexible, communication distance be remote, channel
The advantages that survivable.Currently used short-wave radio set can be divided into simulation short-wave radio set and digital short-wave radio set.Simulate shortwave
Radio station can only transmit analog voice signal, and digital short-wave radio set is can both to realize analog voice call, can also complete data
The modernization radio station of transmission.Although digital radio station is promoted in recent years, analog radio still occuping market larger share.
Because voice is directly modulated on high frequency by analog radio, receiving terminal analog demodulator suffers from channel distortion, strong
The influence of noise jamming, signal are not easy to recognize, therefore have impact on the application of simulation short-wave radio set.In order to meet forward compatibility, one
Secondary property by it is all simulation short-wave radio sets upgrade to digitlization short-wave radio set it is with high costs, produce huge waste.Therefore, in tradition
Install digital signal processing module on analog radio additional, current simulation short-wave radio set is realized that Digital Transmission ability has important answer
With value.
Currently used analog radio numeral reforming mode is to install modem additional on radio station, before modem
End and rear end reconnect signal generator and signal receiver.By radio station transmit outside processing module simplify, portability is existing
One of basic demand of generation communication.
Short wave communication has the characteristics of frequency drift is big, and interchannel noise interference is strong, and high accuracy demodulation needs receiving terminal to carry
For accurate channel priori, including synchronization and offset estimation.Current modem design is primarily upon modulation /demodulation
The demand in practical application is but easily ignored in the optimization of algorithm.In short wave communication, because frequency shift (FS) is unstable, receiving terminal needs
To carry out offset estimation in real time, thus propose it is a kind of meet frequency offset estimation range, can accurate synchronization and the accurate frame of estimation frequency deviation
Structure, for solving the problems, such as that HF digital communication is of practical significance.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind is based on computer sound
The short range digital modem communication method of card, efficiently solve the reception caused by short wave communication is unstable, noise jamming is strong
The problem of signal demodulation failure, front end will be sent with receiving rear end and be reduced to pocket computer processing respectively, for short wave communication
Practical application has reference significance.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of short range digital modem communication method based on computer sound card, this method is using computer sound card as digital-to-analogue
Translation interface, the modulator of short wave communication and demodulator are integrated in transmitting terminal computer with receiving end computer, leading to respectively
Cross sending station and receive radio station and realize short wave communication, specifically include following steps：
1) transmitting terminal computer generation valid data, and valid data are transmitted with preceding pretreatment；
2) transmitting terminal computer generates two sections of targeting sequencings, and carries out targeting sequencing pretreatment respectively；
3) valid data by pretreatment are combined into framing structure with targeting sequencing, before targeting sequencing is located at valid data
End；
4) frame structure that step 3) obtains is handled by Digital Up Convert, then by the computer sound in transmitting terminal computer
Card realizes digital-to-analogue conversion, and the analog signal after conversion is sent by sending station；
5) receive radio station and receive analog signal, and send receiving end computer to, the computer sound in receiving end computer
Card carries out analog-to-digital conversion to analog signal, and the data signal after conversion reverts to complex signal by Digital Down Convert processing；
6) frame synchronization process is carried out to complex signal；
7) signal after synchronization obtains the frequency shift (FS) of targeting sequencing after offset estimation is handled, and according to frequency shift (FS) pair
Signal carries out frequency offset correction；
8) the demodulated processing of signal after frequency offset correction obtains effective information.
Being pre-processed in step 1), before described transmission includes channel coding, check code, spread processing, modulation and shaping.
In step 2), the pretreatment of described targeting sequencing includes differential coding and shaping.
Described transmitting terminal computer includes signal generator, modulator and the computer sound card being sequentially connected, to effective
Data and targeting sequencing are pre-processed and digital-to-analogue conversion；
Described receiving end computer includes computer sound card, demodulator and the error code calculator being sequentially connected, to receiving
The signal arrived carries out analog-to-digital conversion, synchronization, offset estimation and demodulation process.
Described modulator includes the modulation module being connected and digital up-converter module.
Described demodulator includes Digital Down Converter Module, synchronization module, frequency deviation estimating modules and the demodulation being sequentially connected
Module, the signal after described demodulation module corrects to signal frequency deviation pass through channel estimation, burst packets synchronization, Viterbi solution successively
Code, frame structure decompose, channel decoding process, recover effective information.
Described synchronization process is the autocorrelation performance according to reception signal, and frame synchronization is completed by correlation peak location.
Described sending station and interstation channel circumstance is received as radio frequency line is direct-connected or wireless channel.
Compared with prior art, the present invention has advantages below：
(1) front end will be sent and is reduced to pocket computer processing respectively with receiving rear end, efficiently solve short wave communication not
The problem of stable, the strong caused receiving signal demodulation of noise jamming fails；
(2) a kind of new short wave communication frame structure, including valid data D and targeting sequencing are used in the inventive method
T1、T2, the characteristic that meet short wave communication frequency offset time-varying, becomes soon, communications channel estimation is completed with frame structure features, it is high-precision
Exactness completes offset estimation, and utilizes computer platform characteristic, simplifies signal transacting step as far as possible, and it is motor-driven to retain short wave communication
Property strong, using flexible the advantages of；
(3) present invention is according to frame structure features, using the solution frequency shift (FS) of targeting sequencing phase difference, and according in frame structure
The positional information of training sequence is completed synchronously, and training sequence helps burst packets to complete channel estimation simultaneously, is provided for data demodulation
Necessary channel information；
(4) communication means of the present invention can ensure offset estimation accuracy, and ensure demodulation accuracy, have certain reality meaning
It is adopted and perspective.
Brief description of the drawings
Fig. 1 is the structure principle chart of the present invention；
Fig. 2 is short wave communication frame structure schematic diagram of the present invention；
Fig. 3 is modem procedue schematic diagram of the present invention.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to
Following embodiments.
A kind of short range digital modem communication method based on computer sound card, as shown in figure 1, this method is with computer
Sound card is digital-to-analogue conversion interface, and the modulator of short wave communication and demodulator are integrated in into transmitting terminal computer 3 and receiving terminal respectively
In computer 4, short wave communication, sending station and the interstation channel circumstance of reception are realized by sending station 1 and reception radio station 2
For radio frequency line is direct-connected or wireless channel.
Transmitting terminal computer 3 includes signal generator 31, modulator 32 and the computer sound card 33 being sequentially connected, significant figure
It is integrated according to the generation with targeting sequencing, pretreatment and digital-to-analogue conversion in transmitting terminal computer 3.Modulator 32 includes what is be connected
Modulation module and digital up-converter module.Receiving end computer 4 includes the computer sound card 43, demodulator 42 and mistake being sequentially connected
Code calculator 41, analog-to-digital conversion, synchronization, offset estimation and the demodulation process of reception signal are integrated in receiving end computer 4.Solution
Device 42 is adjusted to include Digital Down Converter Module, synchronization module, frequency deviation estimating modules and the demodulation module being sequentially connected.
As shown in figure 3, communication means of the present invention specifically includes following steps：
The first step, transmitting terminal computer 1 generates valid data, and carries out channel coding, check code, expansion to valid data
Frequency processing, modulation and Gauss shaping etc. pre-process before sending；
Second step, transmitting terminal computer 1 generate two sections of targeting sequencings, and respectively before progress differential coding, Gauss shaping etc.
Lead sequence pretreatment；
3rd step, the valid data by pretreatment are combined into framing structure with targeting sequencing, targeting sequencing is positioned at effective
Data Frontend；
As shown in Fig. 2 the communication frame structure of the present invention is collectively constituted by targeting sequencing and valid data.In this frame structure
Under, targeting sequencing keeps initial phase consistent, after channel effect, according to targeting sequencing phase difference and passes through respective algorithms
Solve frequency shift (FS) numerical value.Wherein, the framing mode of valid data is the framing mode of typical general, and training sequence is positioned at centre
Position, head and the tail add tail bit as protection interval respectively, and valid data are then divided into two parts Wei Yu not be at two.
4th step, the frame structure that the 3rd step obtains pass through Digital Up Convert module, then by the meter in transmitting terminal computer 3
Calculation machine sound card 33 realizes digital-to-analogue conversion, and the analog signal after conversion is sent by sending station 1；
5th step, receive radio station 2 and receive analog signal, and send receiving end computer 4 to, in receiving end computer 4
Computer sound card 43 carries out analog-to-digital conversion to analog signal, and the data signal after conversion reverts to multiple by Digital Down Converter Module
Number signal；
6th step, synchronization module carry out frame synchronization process to complex signal, and synchronization process is from phase according to reception signal
Characteristic is closed, frame synchronization is completed by correlation peak location；
7th step, the signal after synchronization obtain the frequency shift (FS) of targeting sequencing after frequency deviation estimating modules are handled, and according to
Frequency shift (FS) carries out frequency offset correction to signal；
As shown in Fig. 2 targeting sequencing and valid data are modulated and are molded respectively.Data are sent by channel and the shadow of noise
Ring, frequency is offset, and frame structure needs to be aligned.Reception signal p (n) synchronization process can be expressed as：
Wherein, c represents the operation result for reception signal.According to c time domain characterize, extract local extremum and with ideal
Situation contrasts, and completes synchronization with this, is directed at decoding region.After targeting sequencing is locked, frequency deviation estimating modules are respectively fed to, for
Both phase informations simultaneously combine channel parameter, solve frequency shift (FS).By Digital Down Convert and by the signal after frequency offset correction, send
Enter demodulation module.
8th step, the signal input demodulation module after frequency offset correction, demodulation module signal frequency deviation is corrected after signal according to
It is secondary to pass through channel estimation, burst packets synchronization, Veterbi decoding, frame structure decomposition, channel decoding process, recover effective information.
This example can apply to typical short wave communication, sends signal and passes through GMSK modulation, reception signal passes through GMSK
Demodulation.In the transmitting terminal and receiving terminal being packaged in computer, computer sound card completes AD/DA conversions.Simultaneously according to shortwave
The USB modulation systems in radio station, transmitting terminal need to carry out signal Digital Up Convert to ensure to send the integrality of data and lossless
Property.
Further, the emulation for HF Digital Communication can include：Under ideal communication channel and Gaussian white noise channel
Offset estimation accuracy is tested, and simulation result shows, offset estimation error is less than 1% under 8dB；Survey the demodulation error code under environment
Rate statistical test, direct-connected measured result show that the bit error rate is zero under 1500 baud rates, and wireless indoor test result shows, 1500
The bit error rate is less than 1e-5 under baud rate.
Embodiments of the invention show, in short wave communication, this communication means can ensure offset estimation accuracy, and ensure to solve
Precision is adjusted, there is certain realistic meaning and perspective.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (8)
- A kind of 1. short range digital modem communication method based on computer sound card, it is characterised in that this method is with computer Sound card is digital-to-analogue conversion interface, and the modulator of short wave communication and demodulator are integrated in into transmitting terminal computer and receiving terminal meter respectively In calculation machine, short wave communication is realized by sending station and reception radio station, specifically includes following steps：1) transmitting terminal computer generation valid data, and valid data are transmitted with preceding pretreatment；2) transmitting terminal computer generates two sections of targeting sequencings, and carries out targeting sequencing pretreatment respectively；3) valid data by pretreatment combines into framing structure with targeting sequencing, the frame structure including valid data D with Targeting sequencing T1、T2, targeting sequencing is located at valid data front end；4) frame structure that step 3) obtains is handled by Digital Up Convert, then real by the computer sound card in transmitting terminal computer Existing digital-to-analogue conversion, the analog signal after conversion are sent by sending station；5) receive radio station and receive analog signal, and send receiving end computer to, the computer sound card pair in receiving end computer Analog signal carries out analog-to-digital conversion, and the data signal after conversion reverts to complex signal by Digital Down Convert processing；6) frame synchronization process is carried out to complex signal；7) signal after synchronization obtains the frequency shift (FS) of targeting sequencing after offset estimation is handled, and according to frequency shift (FS) to signal Carry out frequency offset correction；8) the demodulated processing of signal after frequency offset correction obtains effective information；Communications channel estimation is completed with frame structure features, according to frame structure features, it is inclined to solve frequency using targeting sequencing phase difference Move, and completed synchronously according to the positional information of training sequence in frame structure, training sequence helps burst packets completion channel to estimate simultaneously Meter.
- 2. a kind of short range digital modem communication method based on computer sound card according to claim 1, its feature It is, being pre-processed in step 1), before described transmission includes channel coding, check code, spread processing, modulation and shaping.
- 3. a kind of short range digital modem communication method based on computer sound card according to claim 1, its feature It is, in step 2), the pretreatment of described targeting sequencing includes differential coding and shaping.
- 4. a kind of short range digital modem communication method based on computer sound card according to claim 1, its feature It is, described transmitting terminal computer includes signal generator, modulator and the computer sound card being sequentially connected, to valid data Pre-processed with targeting sequencing and digital-to-analogue conversion；Described receiving end computer includes computer sound card, demodulator and the error code calculator being sequentially connected, to what is received Signal carries out analog-to-digital conversion, synchronization, offset estimation and demodulation process.
- 5. a kind of short range digital modem communication method based on computer sound card according to claim 4, its feature It is, described modulator includes the modulation module being connected and digital up-converter module.
- 6. a kind of short range digital modem communication method based on computer sound card according to claim 4, its feature It is, described demodulator conciliates mode transfer including Digital Down Converter Module, synchronization module, the frequency deviation estimating modules being sequentially connected Block, the signal after described demodulation module corrects to signal frequency deviation pass through channel estimation, burst packets synchronization, Viterbi solution successively Code, frame structure decompose, channel decoding process, recover effective information.
- 7. a kind of short range digital modem communication method based on computer sound card according to claim 4, its feature It is, described synchronization process is the autocorrelation performance according to reception signal, and frame synchronization is completed by correlation peak location.
- 8. a kind of short range digital modem communication method based on computer sound card according to claim 1, its feature It is, described sending station and receives interstation channel circumstance as radio frequency line is direct-connected or wireless channel.
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| CN110278170B (en) * | 2019-07-12 | 2022-05-03 | 西安烽火电子科技有限责任公司 | Short wave communication frequency offset estimation method based on maximum likelihood |
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| CN1635468A (en) * | 2003-12-29 | 2005-07-06 | 中国电子科技集团公司第三十研究所 | Sound card based modulation-demodulation method and system |
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| CN101079688B (en) * | 2006-05-23 | 2010-09-01 | 中兴通讯股份有限公司 | A synchronization method in orthogonal frequency division multiplexing system |
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| 基于软件无线电的跳频电台调制解调设计;李冬;《中国优秀硕士论文全文数据库》;中国学术期刊（光盘版）电子杂志社;20120815(第8期);第37页第1段第3行、第4.1节第5行，第45页第5.1节第4-5行，图4.1 * |
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