CN103905144B - 16 level high-speed narrow-band modems - Google Patents
16 level high-speed narrow-band modems Download PDFInfo
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- CN103905144B CN103905144B CN201210579794.2A CN201210579794A CN103905144B CN 103905144 B CN103905144 B CN 103905144B CN 201210579794 A CN201210579794 A CN 201210579794A CN 103905144 B CN103905144 B CN 103905144B
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Abstract
The present invention proposes a kind of 16 level high-speed narrow-band modems, including data interface module, baseband processing module and digital processing module.Baseband processing module is bi-directionally connected with data interface module, digital processing module respectively, after baseband processing module carries out stabilization, shaping to the first data-signal from data interface module, coding calculating is carried out to the first data of acquisition, generate the first error correcting code of redundancy, the first data and the first error correcting code are interleaved again, the second data after intertexture generate symbol according to the mapping relations of 16 level, are then forwarded to digital processing module；Baseband processing module also inversely generates third data to the symbol from digital processing module, and third data-signal is screened, is deinterleaved, it is reverse to generate the 4th data and the second error correcting code, it is calculated the accuracy of the 4th data with the second error correcting code and is corrected in the 4th data and repair error code, the original series of the 4th data are recovered, and are forwarded to data interface module.
Description
Technical field
The present invention relates to wireless narrow band communication fields, more particularly to a kind of 16 level high-speed narrow-band modems.
Background technique
Digital modulation mode is widely used in instant wireless data transmission, the corresponding bandwidth when transmission rate improves
Also it will increase, while needing various agreements that the accuracy rate to guarantee data transmission, various agreements is supported undoubtedly to increase redundant digit
According to reduction actual transmissions efficiency.Existing data transmission system, majority use GMSK（Gaussian Filtered Minimum
Shift Keying, GMSK Gaussian-filtered minimum shift keying）Data modulation, there are also the FSK using 4 level or 8 level
（Frequency-shift keying, frequency shift keying）, when wherein GMSK rate reaches 9.6kbps and 19.2kbps, occupy
Audio bandwidth be 4.8kHz and 9.6kHz, had exceeded common call bandwidth, and 4 level FSK in the case where bandwidth is constant
At most by rate promotion to 9.6kbps, 8 level FSKs are also at maximum up to 19.2kbps.
The demand that industrial Three-tele system transmits data is instantaneity, and the transmission of moment mass data necessarily requires data to transmit
The high speed of equipment, efficiently.Here big data quantity be likely to be breached it is KB grades a few, if in traditional modulation demodulation system
The transmission rate of 1.2Kbps or 2.4Kbps is transmitted, and each collection point just needs more than ten seconds.When a system reaches up to ten thousand
When collection point, all acquisition once needs to spend tens hours, this is that industrial system is intolerable.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of 16 level high-speed narrow-band modems, can be not
Improve data transfer rate under the premise of increase occupied bandwidth.
The present invention is to solve above-mentioned technical problem and the technical solution adopted is that propose a kind of 16 level high-speed narrow-band tune
Modulator-demodulator, including data interface module, baseband processing module, digital processing module.The data interface module is for carrying out
Signal transfer between external data source and baseband processing module, the signal transfer include insulation blocking and the electricity of interior external circuit
Flat transformation.The baseband processing module is bi-directionally connected with the data interface module, the digital processing module respectively, the base
Tape handling module carries out after including stabilization, the fundamental optimum of shaping the first data-signal from the data interface module,
Coding calculating is carried out to the first data of acquisition, generates the first error correcting code of redundancy, then by first data and the first error correction
Code is interleaved, and the second data after intertexture generate symbol according to the mapping relations of 16 level, is then forwarded to described
Digital processing module, the baseband processing module also inversely generate third number to the symbol from the digital processing module
According to, and the third data-signal is screened, is deinterleaved, it is reverse to generate the 4th data and the second error correcting code, with described the
Two error correcting codes, which calculate the accuracy of the 4th data and correct in the 4th data, repairs error code, recovers described
The original series of four data, and it is forwarded to the data interface module.
In one embodiment of this invention, 16 level high-speed narrow-band modems further include control and monitoring module,
It is bi-directionally connected with the baseband processing module, the operation conditions of the baseband processing module is monitored, if at the base band
Reason module is operating abnormally, and the control and monitoring module re-start initialization to the baseband processing module.
In one embodiment of this invention, 16 level high-speed narrow-band modems further include data memory module, with
The baseband processing module is bi-directionally connected, and carries out temporary or permanent storage to from the baseband processing module data.
In one embodiment of this invention, the data memory module also carries out program again to the baseband processing module
Write-in.
In one embodiment of this invention, 16 level high-speed narrow-band modems further include modulus and digital to analog conversion mould
Block and analog signal matching module；The data processing from the baseband processing module is depicted in the digital processing module
Analog signal feature is supplied to the modulus and digital to analog conversion module and carries out digital to analog conversion, and the digital processing module is also to coming from
Signal after the modulus and digital to analog conversion module analog to digital conversion is handled, and restores what the baseband processing module can identify
Data-signal；The modulus and digital to analog conversion module are double with the digital processing module, the analog signal matching module respectively
To connection, digital-to-analogue conversion is carried out to the signal from the digital processing module, and send the signal after conversion to the mould
Quasi- Signal Matching module, the modulus and digital to analog conversion module carry out modulus to the signal from the analog signal matching module
Conversion, and send the signal after conversion to the digital processing module；The analog signal matching module and external radio frequency
Module is bi-directionally connected, to the analog signal from the modulus and digital to analog conversion module amplify filtering and impedance transformation with
Requirement with the radio-frequency module, the analog signal matching module carry out impedance transformation to the signal from the radio-frequency module
It is filtered with amplification, the radio-frequency module is made to be able to satisfy the transformation requirement of the modulus and digital to analog conversion module.
In one embodiment of this invention, 16 level high-speed narrow-band modems further include the radio frequency control mould
Block is bi-directionally connected with the baseband processing module, external radio frequency module respectively, to control and acquisition from baseband processing module
Order is converted into the instruction that external radio frequency module can identify, is converted into baseband processing module to the response from external radio frequency module
The instruction that can be identified.
In one embodiment of this invention, the forward error correction coding in the baseband processing module uses RS code.
In one embodiment of this invention, the forward error correction coding in the baseband processing module uses RS（16,12,2）
Code.
16 level high-speed narrow-band modems of the invention use the modulation and demodulation mode of 16 level, using width
Degree is the modulation system of information carrier, uses same bandwidth with 4 level and 8 level, increases level capacity to improve data biography
Defeated rate, entire scheme have the characteristics that high efficiency and low cost, and embodiment facilitates succinct, is conducive to largely implement.
Detailed description of the invention
For the above objects, features and advantages of the present invention can be clearer and more comprehensible, below in conjunction with attached drawing to tool of the invention
Body embodiment elaborates, wherein：
Fig. 1 is the functional block diagram of the 16 level high-speed narrow-band modems of one embodiment of the invention；
Fig. 2 is the structural schematic diagram of the 16 level high-speed narrow-band modems of one embodiment of the invention；
Fig. 3 is check code generating process used by the 16 level high-speed narrow-band modems of one embodiment of the invention
Figure；
Fig. 4 is packet structure figure used by the 16 level high-speed narrow-band modems of one embodiment of the invention；
Fig. 5 is frame structure diagram used by the 16 level high-speed narrow-band modems of one embodiment of the invention；
Fig. 6 is synchronous head structure figure used by the 16 level high-speed narrow-band modems of one embodiment of the invention；
Fig. 7 is symbol synchronization waveform used by the 16 level high-speed narrow-band modems of one embodiment of the invention
Figure；
Fig. 8 is frame synchronization structure figure used by the 16 level high-speed narrow-band modems of one embodiment of the invention.
Specific embodiment
16 level high-speed narrow-band modems of the embodiment of the present invention use the modulation and demodulation mode of 16 level,
Use amplitude for the modulating mode of information carrier.
Fig. 1 shows the functional block diagram of the 16 level high-speed narrow-band modems of one embodiment of the invention.Fig. 2 shows
The structural schematic diagrams of the 16 level high-speed narrow-band modems of one embodiment of the invention.It, should shown in referring to Figures 1 and 2
Modem 100 includes data interface module 102, control and monitoring module 104, baseband processing module 106, data storage mould
Block 108, digital processing module 110, modulus and digital to analog conversion module 112, analog signal matching module 114, radio frequency control module
116 and power module 118.
Outside modem 100, data interface module 102 is bi-directionally connected with external data source 200.In modulation /demodulation
Inside device 100, data interface module 102 is bi-directionally connected with baseband processing module 106.Data interface module 102 is outer for carrying out
The signal transfer of portion's data source 200 and baseband processing module 106, insulation blocking and level translation including interior external circuit.
Control and monitoring module 104 are bi-directionally connected with baseband processing module 106, to the operation shape of baseband processing module 106
Condition is monitored.If baseband processing module 106 is operating abnormally, control and monitoring module 104 judge monitoring parameter,
After the parameter is more than the threshold value that system allows, control and monitoring module 104 are forced to make baseband processing module by control channel
106 re-start initialization.
Baseband processing module 106 respectively with data interface module 102, digital processing module 110, data memory module 108,
Radio frequency control module 116 is bi-directionally connected.Baseband processing module 106 is to the first data-signal from data interface module 102（Example
Such as send data-signal）Carry out including carrying out base band calculation process after stabilization, the fundamental optimum of shaping --- coding, i.e., by first
Data carry out coding calculating, generate the first error correcting code of redundancy, then all the first data and the first error correcting code are interleaved,
The second data after intertexture generate symbol according to the mapping relations of 16 level, are then forwarded to digital processing module 110.
Baseband processing module 106 is also to the symbol from digital processing module 110（Such as received analog signal becomes by modulus
The data-signal generated after changing）It is reverse to generate third data, and third data are screened, are decoded, i.e., demodulation is generated
Symbol inversely generates third data, and is deinterleaved to these third data, recovers the 4th data and the second error correction
Code calculates the accuracy of the 4th data and corrects in the 4th data and repair error code, finally judges further according to the second error correcting code
The validity of these the 4th data is simultaneously forwarded to data interface module 102.It all data processings of baseband processing module 106 and deposits
Chu Jun is completed by data memory module 108.The control and acquisition of 106 pairs of baseband processing module external radio-frequency modules 300（Such as
Frequency power etc.）Completed by radio frequency control module 116.The working condition of itself is notified to control by baseband processing module 106
And monitoring module 104, if initialization can be re-started to it by control and monitoring module 104 by exception occur.
In one embodiment, forward error correction in baseband processing module 106（Forward Error Correction,FEC）
Reed-Solomon code can be used in coding（Abbreviation RS code）.The feature of RS code maximum is can to entangle discrete error code and entangle strong prominent
Bunchiness error code caused by hair shaft is disturbed, effectively improves the error performance of data transmission.The present embodiment is using the Reed- shortened
Solomon code, i.e. RS（16,12,2）Code.The error correcting code of 4 bytes is added in it in every 12 data bytes, constitutes 16 words
The code character of section can correct the error code of 2 bytes.RS（16,12）It is exactly RS（255,251）Shortening code.
Fig. 3 shows the generating process of check code in the cataloged procedure of coding/decoding module according to an embodiment of the invention：
It divided by generator polynomial g (x) residue rem (x) obtained is exactly that check code is corresponding with the corresponding polynomial ds (x) of information code character
Multinomial.Polynomial division can be realized with shift register, for RS（16,12）, the generating process of check code
See Fig. 3.With RS（16,12,2）For, generator polynomial is：g(x)=x4+α75x3+α249x2+α78x+α6。
The Error Correction of Coding of generation and initial data are interleaved by baseband processing module 106 together, and the present embodiment uses 3
Code character（3×16）Short delivery knit, the following Tables 1 and 2 of deinterleaving method：
Table 1 interweaves preceding coding
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 |
| 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 |
Table 2 encodes after interweaving
| 1 | 17 | 33 | 2 | 18 | 34 | 3 | 19 | 35 | 4 | 20 | 36 | 5 | 21 | 37 | 6 |
| 22 | 38 | 7 | 23 | 39 | 8 | 24 | 40 | 9 | 25 | 41 | 10 | 26 | 42 | 11 | 27 |
| 43 | 12 | 28 | 44 | 13 | 29 | 45 | 14 | 30 | 46 | 15 | 31 | 47 | 16 | 32 | 48 |
Error Correction of Coding is generated in baseband processing module 106 and intertexture block diagram please refers to the packet structure of Fig. 4.
The data that baseband processing module 106 completes intertexture generate symbol according to the mapping relations of the following table 3.
Table 3
| Bit | 0000 | 0001 | 0010 | 0011 | 0100 | 0101 | 0110 | 0111 |
| Symbol | +15 | +13 | +11 | +9 | +7 | +5 | +3 | +1 |
| Bit | 1111 | 1110 | 1101 | 1100 | 1011 | 1010 | 1001 | 1000 |
| Symbol | -1 | -3 | -5 | -7 | -9 | -11 | -13 | -15 |
The above-mentioned process of 106 contrary operation of baseband processing module completes solution error correction.
Data memory module 108 is bi-directionally connected with baseband processing module 106, to the data from baseband processing module 106
Temporary or permanent storage is carried out, data memory module 108 can also carry out program to baseband processing module 106 and re-write.
Digital processing module 110 is bi-directionally connected with baseband processing module 106, modulus and digital to analog conversion module 112.At number
Reason module 110 handles the data from baseband processing module 106, and analog signal feature is depicted and is supplied to modulus sum number
Modular transformation module 112 carries out digital to analog conversion.Digital processing module 110 carries out modulus to from modulus and digital to analog conversion module 112
Transformed signal is handled, and the data-signal that baseband processing module 106 can identify is restored.
Frame structure shown in fig. 5, including synchronous head, frame synchronization, data packet n can be used in digital processing module 110（n<
4000）And end mark.Here, synchronous head is using synchronous head structure shown in Fig. 6, including carrier pilot, symbol synchronization, rate
Information and channel guess value code, carrier pilot use sine wave, and symbol synchronization uses Bark pattern（Referring to Fig. 7, i.e. ,+15, -15, -
15,+15,-15,+15）, rate information use 4 symbols（+ 15, -15 ,+15, -15 represent 38400bps；+15,+15,+15,-
15 represent 19200bps；- 15, -15 ,+15, -15 represent 9600bps；Other combinations retain spare）, channel guess value code is using 20
A symbol（+15,-3,+7,+1,-7,+5,-3,+7,-5,-3,+1,-1,+5,-7,-11,+13,-3,+11,-15,+5）.Frame is same
Step uses frame synchronization structure shown in Fig. 8, including data length information height each eight, separately there are two eight as reservation.Terminate
Mark is two C0.
Adaptive channel estimation algorithm is used when digital processing module 110 demodulates, and will be received signal and is calibrated to ideal automatically
Then state is demodulated.
Digital processing module 110 is realized using raised cosine low-pass filter, is defined as follows：
Wherein b=0.2, T are the time width of symbol.
Modulus and digital to analog conversion module 112 are bi-directionally connected with digital processing module 110, analog signal matching module 114.Mould
Several and digital to analog conversion module 112 carries out digital-to-analogue conversion to the signal from digital processing module 110, and the signal after conversion is passed
Analog signal matching module 114 is given, modulus and digital to analog conversion module 112 are to the signal from analog signal matching module 114
Analog-to-digital conversion is carried out, and sends the signal after conversion to digital processing module 110.
Radio-frequency module 300 two-way company of the analog signal matching module 114 also with modulus and digital to analog conversion module 112, outside
It connects.Analog signal matching module 114 amplifies filtering and impedance to the analog signal from modulus and digital to analog conversion module 112
It converts to match the requirement of radio-frequency module 300.Analog signal matching module 114 hinders the signal from radio-frequency module 300
Resistance changes and amplifies filtering, can meet the transformation requirement of modulus and digital to analog conversion module 112.
Radio frequency control module 116 is bi-directionally connected with baseband processing module 106, radio-frequency module 300.Radio frequency control module 116
To from baseband processing module 106 control and acquisition be converted into the instruction that external radio-frequency module 300 can identify, to
The instruction that baseband processing module 106 can identify is converted into from the response of external radio-frequency module 300.
Power module 118 is deposited with data interface module 102, control and monitoring module 104, baseband processing module 106, data
Store up module 108, digital processing module 110, modulus and digital to analog conversion module 112, analog signal matching module 114, radio frequency control
Module 116 connects, and provides the power supply of 5V, 3.3V, 2.5V for all modules.
Due to 16 level high-speed narrow-band modems made of present invention employs above technical scheme, making with it is existing
Technology is compared and is had the following advantages that：Data frame structure is simple and clear；Increase redundancy encoding code and carries out forward error correction coding and intertexture
Coding reduces the error code in transmission, improves the accuracy of data transmission；Using synchronous transfer module balance transmission efficiency；Using
Amplitude is the hopping pattern of information carrier, does not increase the occupancy of bandwidth, and entire scheme has the characteristics that high efficiency and low cost,
And it is easy to implement succinct, be conducive to largely implement.
Although the present invention is disclosed as above with preferred embodiment, however, it is not to limit the invention, any this field skill
Art personnel, without departing from the spirit and scope of the present invention, when can make a little modification and perfect therefore of the invention protection model
It encloses to work as and subject to the definition of the claims.
Claims (7)
1. a kind of 16 level high-speed narrow-band modems, including data interface module, baseband processing module, digital processing mould
Block, wherein
The data interface module is used to carry out signal transfer between external data source and baseband processing module, in the signal
Subcontract the insulation blocking and level translation for including interior external circuit；
The baseband processing module is bi-directionally connected with the data interface module, the digital processing module respectively, the base band
Processing module carries out after including stabilization, the fundamental optimum of shaping the first data-signal from the data interface module, right
The first data obtained carry out coding calculating, generate the first error correcting code of redundancy, then by first data and the first error correcting code
It is interleaved, the second data after intertexture generate symbol according to the mapping relations of 16 level, are then forwarded to the number
Word processing module, the baseband processing module also inversely generate third number to the symbol from the digital processing module
According to, and the third data-signal is screened, is deinterleaved, the 4th data of reverse generation and the second error correcting code, use second are entangled
Error code, which calculates the accuracy of the 4th data and corrects in the 4th data, repairs error code, recovers the 4th number
According to original series, and be forwarded to the data interface module；
It further include modulus and digital to analog conversion module and analog signal matching module；
The digital processing module is depicted analog signal feature and is supplied to the data processing from the baseband processing module
The modulus and digital to analog conversion module carry out digital to analog conversion, and the digital processing module is also to from the modulus and digital to analog conversion
Signal after module analog to digital conversion is handled, and the data-signal that the baseband processing module can identify is restored；
The modulus and digital to analog conversion module respectively with the digital processing module, the two-way company of analog signal matching module
It connects, digital-to-analogue conversion is carried out to the signal from the digital processing module, and send the signal after conversion to the simulation and believe
Number matching module, the modulus and digital to analog conversion module carry out modulus to the signal from the analog signal matching module and turn
It changes, and sends the signal after conversion to the digital processing module；
The analog signal matching module is bi-directionally connected with external radio-frequency module, to from the modulus and digital to analog conversion module
Analog signal amplify filtering and impedance transformation to match the requirement of the radio-frequency module, the analog signal matching module
To from the radio-frequency module signal carry out impedance transformation and amplification filtering, make the radio-frequency module be able to satisfy the modulus and
The transformation requirement of digital to analog conversion module.
2. 16 level high-speed narrow-band modem as described in claim 1, which is characterized in that further include control and monitoring
Module is bi-directionally connected with the baseband processing module, is monitored to the operation conditions of the baseband processing module, if the base
Tape handling module is operating abnormally, and the control and monitoring module re-start initialization to the baseband processing module.
3. 16 level high-speed narrow-band modem as described in claim 1, which is characterized in that further include data storage mould
Block is bi-directionally connected with the baseband processing module, carries out temporary or permanent storage to from the baseband processing module data.
4. 16 level high-speed narrow-band modem as claimed in claim 3, which is characterized in that the data memory module
Also program is carried out to the baseband processing module to re-write.
5. 16 level high-speed narrow-band modem as described in claim 1, which is characterized in that further include radio frequency control mould
Block is bi-directionally connected with the baseband processing module, external radio frequency module respectively, to control and acquisition from baseband processing module
Order is converted into the instruction that external radio frequency module can identify, is converted into baseband processing module to the response from external radio frequency module
The instruction that can be identified.
6. 16 level high-speed narrow-band modem as described in claim 1, which is characterized in that the baseband processing module
In forward error correction coding use RS code.
7. 16 level high-speed narrow-band modem as described in claim 1, which is characterized in that the baseband processing module
In forward error correction coding use RS (16,12,2) code.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200969591Y (en) * | 2006-08-04 | 2007-10-31 | 上海协同科技股份有限公司 | Wireless narrowband modem |
| CN101521788A (en) * | 2008-02-25 | 2009-09-02 | 徐连彦 | Wireless audio frequency and image modem |
| CN201307865Y (en) * | 2008-12-03 | 2009-09-09 | 上海协同科技股份有限公司 | Moderate-speed wireless narrowband modem |
| CN102427386A (en) * | 2011-09-19 | 2012-04-25 | 武汉邮电科学研究院 | Polarization shift keying demodulation method and system |
| CN202261512U (en) * | 2011-08-17 | 2012-05-30 | 上海协同科技股份有限公司 | Eight-level wireless narrow band modem |
-
2012
- 2012-12-27 CN CN201210579794.2A patent/CN103905144B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200969591Y (en) * | 2006-08-04 | 2007-10-31 | 上海协同科技股份有限公司 | Wireless narrowband modem |
| CN101521788A (en) * | 2008-02-25 | 2009-09-02 | 徐连彦 | Wireless audio frequency and image modem |
| CN201307865Y (en) * | 2008-12-03 | 2009-09-09 | 上海协同科技股份有限公司 | Moderate-speed wireless narrowband modem |
| CN202261512U (en) * | 2011-08-17 | 2012-05-30 | 上海协同科技股份有限公司 | Eight-level wireless narrow band modem |
| CN102427386A (en) * | 2011-09-19 | 2012-04-25 | 武汉邮电科学研究院 | Polarization shift keying demodulation method and system |
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