CN202261512U - Eight-level wireless narrow band modem - Google Patents
Eight-level wireless narrow band modem Download PDFInfo
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- CN202261512U CN202261512U CN2011203000664U CN201120300066U CN202261512U CN 202261512 U CN202261512 U CN 202261512U CN 2011203000664 U CN2011203000664 U CN 2011203000664U CN 201120300066 U CN201120300066 U CN 201120300066U CN 202261512 U CN202261512 U CN 202261512U
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Abstract
The utility model provides an eight-level wireless narrow band modem, which comprises an interface module, a logic and control module, an encoding and decoding module, a modulation-demodulation module and a filtering and amplifying module, wherein the modulation-demodulation module modulates and demodulates eight levels. The eight-level wireless narrow band modem can increase the data transmission speed on the premise of narrow occupied bandwidth.
Description
Technical field
The utility model relates to wireless narrow band communication field, relates in particular to the wireless narrow band modem of a kind of eight level.
Background technology
Digital modulation mode is widely used in wired and wireless data transmission, when transmission rate is higher to the requirement of bandwidth than higher, and need complicated agreement support, can reduce actual transmissions efficient.The data transmission system of for example using always in the prior art; Adopt the GMSK data-modulated, 2FSK and MSK have taken many bandwidth less relatively, but its bandwidth that takies is relevant with speed; Speed high bandwidth more is also wide more; When speed reached 9.6kbps and 19.2kbps, its audio bandwidth that takies was 4.8kHz and 9.6kHz, had exceeded common conversation bandwidth.
The demand that Industry Control market logarithm passes is a high real-time, efficiently, at a high speed; And data volume can not be tens bytes in the past again; Possibly reach the 1k level fully, this data volume is obviously big a lot of than former, transmits with the transmission rate of 1.2Kbps in traditional modulation demodulation system or 2.4Kbps; Need 3～7 seconds, can't satisfy the demand of practical application.
The utility model content
The technical problem that the utility model will solve provides the wireless narrow band modem of a kind of eight level, can under the less prerequisite of occupied bandwidth, improve message transmission rate.
For solving the problems of the technologies described above, the utility model provides a kind of eight level wireless narrow band modem, comprising: interface module, logic and control module, coding/decoding module, modulation module and filtering amplification module,
Said interface module and external data source are with said logic and control module is two-way is connected; Carry out the signal transfer of said external data source and logic and control module; Said interface module and external radio frequency module and said two-way connection of filtering amplification module are carried out the signal transfer of said external radio frequency module and filtering amplification module;
Said logic and control module also are connected with said coding/decoding module is two-way; Transmission data-signal to from said interface module is prevented trembling, be sent to said coding/decoding module after the shaping, and the reception data-signal from said coding/decoding module is carried out being forwarded to said interface module after validity is judged;
Said coding/decoding module also with said two-way connection of modulation module; The back generation of encoding from the transmission data-signal of said logic and control module is treated modulation signal and is sent to said modulation module, the back of decoding from the restituted signal of said modulation module is produced said reception data-signal and is sent to said logic and control module;
Said modulation module also with said two-way connection of filtering amplification module; To from said coding/decoding module treat that modulation signal carries out producing modulation signal after eight level modulation and being sent to said filtering amplification module, the signal to be demodulated from said filtering amplification module is carried out producing restituted signal and being sent to said coding/decoding module after eight level demodulation;
Said filtering amplification module carries out filtering and amplifies the back producing the transmission radiofrequency signal and transferring to said external radio frequency module through said interface module to the modulation signal from said modulation module to carrying out filtering from the radiofrequency signal of said interface module and amplifying the said signal to be demodulated of back generation.
Alternatively; Said interface module comprises data-interface and COBBAIF; Said data-interface and said external data source are with logic and control module is two-way is connected; Realize the signal transfer of said external data source and logic and control module, said COBBAIF is connected with the filtering amplification module is two-way with said external radio frequency module, realizes the signal transfer of said external radio frequency module and filtering amplification module.
Alternatively; Said interface module also comprises the control signal interface; Said control signal interface receives the control signal of said external data source and forwards it to said logic and control module, and said logic and control module are controlled the opening and closing of said external radio frequency module according to said control signal.
Alternatively, said logic and control module are also talked about switching and/or are controlled said COBBAIF opening and closing according to said control signal actual figure.
Alternatively, said data-interface comprises signal sending end, signal receiving end and request of data transmission signal end;
Said COBBAIF comprises signal sending end, modulation signal receiving terminal, voice signal end and Mike's signal end;
Said control signal interface comprises that the radio station receives control signal end, radio station control signalling end, received field strength signal end and call request signal end.
Alternatively; Said filter amplification circuit comprises first filter amplification circuit and second filter amplification circuit; Said second filter amplification circuit receives from the received RF signal of said COBBAIF and carries out filtering and amplification, and said first filter amplification circuit receives from the modulation signal of said modulation module and carries out filtering and amplification.
Alternatively; Said coding/decoding module also adds the redundant correcting information and/or the scrambler that interweaves in from the transmission data-signal of said logic and control module, and the restituted signal from said modulation module is carried out reverse trellis decoded and/or error correction recovery.
Alternatively, said modulation module is to treating that from said coding/decoding module modulation signal carries out eight level modulation and comprises: convert the said modulation signal of treating into warbled eight level of changes in amplitude modulation signal.
Alternatively, the wireless narrow band modem of said eight level also is included as the power module of said interface module, logic and control module, coding/decoding module, modulation module and the power supply of filtering amplification module.
Alternatively, said power module comprises linear voltage decreasing adjustment pipe and is connected in the filter capacitor that input/output terminal is managed in this linear voltage decreasing adjustment.
Compared with prior art, the utlity model has following advantage:
The wireless narrow band modem of eight level of the utility model embodiment adopts the modulation and demodulation mode of eight level; I.e. employing amplitude is the frequency modulation pattern of information carrier; Reduced taking of bandwidth effectively, improved message transmission rate, whole proposal has high reliability and characteristics cheaply; And execution mode is convenient succinct, helps a large amount of deployment.
In addition, adopt the technical scheme of present embodiment, can use simple and clear data frame structure, increase the small amount of redundancy sign indicating number and carry out the error code in forward error correction coding and the toe coding reduction transmission, the correctness and the fail safe that have improved transfer of data.
Description of drawings
Fig. 1 is the structured flowchart of the wireless narrow band modem of eight level of the utility model embodiment;
Fig. 2 is the detailed structure sketch map of the wireless narrow band modem of eight level of the utility model embodiment;
Fig. 3 is the frame assumption diagram that the wireless narrow band modem of eight level of this implementation new embodiment is adopted;
Fig. 4 is the bit synchronization header structure figure that the wireless narrow band modem of eight level of this implementation new embodiment is adopted;
Fig. 5 is the check code generative process figure of this implementation new embodiment;
Fig. 6 is the signal waveform sketch map of eight level modulation demodulating processes of this implementation new embodiment.
Embodiment
The wireless narrow band modem of eight level of the utility model embodiment adopts the modulation and demodulation mode of eight level; I.e. employing amplitude is the frequency modulation pattern of information carrier; Reduced taking of bandwidth effectively, improved message transmission rate, whole proposal has high reliability and characteristics cheaply; And execution mode is convenient succinct, helps a large amount of deployment.
In addition, adopt the technical scheme of present embodiment, can use simple and clear data frame structure, increase the small amount of redundancy sign indicating number and carry out the error code in forward error correction coding and the toe coding reduction transmission, the correctness and the fail safe that have improved transfer of data.
Below in conjunction with specific embodiment and accompanying drawing the present invention is described further, but should limit protection scope of the present invention with this.
Fig. 1 shows the structural representation of the wireless narrow band modem 300 of eight level of present embodiment, comprising: interface module 1, logic and control module 2, coding/decoding module 3, modulation module 4 and filtering amplification module 5.In addition, can also comprise power module 6.
Wherein, Interface module 1 and external data source 100 and logic and 2 two-way connections of control module; Carry out the signal transfer of external data source 100 and logic and control module 2; Interface module 1 and external radio frequency module 200 and 5 two-way connections of filtering amplification module are carried out the signal transfer of external radio frequency module 200 and filtering amplification module 5.
Logic and control module 2 also with 3 two-way connections of coding/decoding module; Transmission data-signal to from interface module 1 is prevented trembling, be sent to coding/decoding module 3 after the shaping, and the reception data-signal from coding/decoding module 3 is carried out being forwarded to interface module 1 after validity is judged
Coding/decoding module 3 also with 4 two-way connections of modulation module; The back generation of encoding from the transmission data-signal of logic and control module 2 is treated modulation signal and is sent to modulation module 4, the back of decoding from the restituted signal of modulation module 4 is produced the reception data-signal and is sent to logic and control module 2.
5 pairs of radiofrequency signals from interface module 1 of filtering amplification module are carried out filtering and are amplified back generation signal to be demodulated, and the modulation signal from modulation module 4 is carried out filtering and amplify the back producing the transmission radiofrequency signal and transferring to external radio frequency module 200 through interface module 1.
Fig. 2 shows the detailed structure of Fig. 1, and wherein, interface module 1 comprises data-interface 11, COBBAIF 12, control signal interface 13 and power interface 14; Filtering amplification module 5 comprises first filter amplification circuit 51 and second filter amplification circuit 52.Concrete, data-interface 11 and external data source 100 and logic and 2 two-way connections of control module are realized the signal transfer of external data source 100 and logic and control module 2; COBBAIF 12 and external radio frequency module 200 and 5 two-way connections of filtering amplification module are realized the signal transfer of external radio frequency module 200 and filtering amplification module 5; Control signal interface 13 receives the control signal of external data source 100 and forwards it to logic and control module 2; Logic and control module 2 are according to the opening and closing of these control signal control external radio frequency 200 modules; In addition, logic and control module 2 are also talked about switching and/or are controlled above-mentioned COBBAIF 12 opening and closing according to this control signal actual figure; Power interface 14 receives the power supply signal of power module 6.
More specifically; Data-interface 11 comprises a signal sending end (TD), a signal receiving end (RD) and a request of data transmitting terminal (RTS); This request of data transmitting terminal is mainly used in the data request signal that receives in the above-mentioned control signal, and carries out the control corresponding operation.
COBBAIF 12 comprises a modulation signal transmitting terminal (TFSK), a restituted signal receiving terminal (RFSK), a voice signal end (SPK) and Mike's signal end (MIC).
First filter amplification circuit 51 in the filter amplification circuit 5 receives from the modulation signal of modulation module 4 and carries out filtering and amplification, and with filtering with amplify after modulation signal be sent to external radio frequency module 200 via COBBAIF 12 and launch; Second filter amplification circuit 52 receives from the received RF signal of COBBAIF 12 and carries out filtering and amplification, and the received RF signal after filtering amplified is sent to modulation module 4 and carries out eight level demodulation.
As a preferred embodiment; Coding/decoding module 3 also adds the redundant correcting information and/or the scrambler that interweaves in from the transmission data-signal of logic and control module 2, and the restituted signal from modulation module 4 is carried out reverse trellis decoded and/or error correction recovery.Modulation module 4 also will convert the modulation signal with warbled eight level of changes in amplitude into from the modulation signal of treating of second filter amplification circuit 52.
The course of work of facing the wireless narrow band modem of eight level of present embodiment is down further described.Fig. 3 shows the frame assumption diagram of present embodiment, and Fig. 4 shows the bit synchronization header structure figure of present embodiment.
In conjunction with Fig. 2 to Fig. 4.; In the process of transmitting; Coding/decoding module 3 in sending data-signal, add redundant signals and encode, scrambler (comprising error correction coding, interweaving encoding etc.), correctness and fail safe when improving transfer of data produce afterwards and treat modulation signal; In receiving course, the restituted signal of the demodulation module of automodulation in the future 4 is decoded, and rejects redundant information, reverts to original reception data-signal.Coding/decoding module 3 in the present embodiment adopts a kind of quite succinct data frame structure when coding; As shown in Figure 3, be equipped with bit synchronization head, frame synchronization head in start of frame bits, several follow packet the back; The number of packet is not limit in theory, last frame end mark; All data have all been rejected the redundant code of asynchronous transmission, adopt synchronous mode, and what except the end mark of the synchronizing information of several bytes of frame head and postamble, transmit is clear data, and efficiency of transmission is further improved, and concrete bit synchronization header structure please refer to Fig. 4.
The error correcting technique of present embodiment adopts Reed-Solomon sign indicating number (being called for short the RS sign indicating number); The maximum characteristics of RS sign indicating number are to entangle discrete error code, can entangle the bunchiness error code that strong bursty interference causes again, have improved the error performance of transfer of data effectively; Adopt the Reed-Solomon sign indicating number that shortens; It is RS (16,12,2) sign indicating number.It adds 4 error correction byte at 12 information byte, constitutes the code character of 16byte.Can correct the error code of 2 byte.RS (16,12) is exactly the shortening sign indicating number of RS (255,251).
Fig. 5 shows the generative process of check code in the cataloged procedure of coding/decoding module of present embodiment: the residue rem (x) that is obtained divided by generator polynomial g (x) with the corresponding multinomial ds (x) of information code character is exactly the corresponding multinomial of check code.Polynomial division can realize that for RS (16,12), the generative process of its check code is seen Fig. 5 with shift register.With RS (16,12,2) is example, and its generator polynomial is: g (x)=x
4+ α
75x
3+ α
249x
2+ α
78X+ α
6
The digital signal that modulation module 4 will be encoded converts modulation signal to, and restituted signal is reverted to the digital signal of encoding; Wherein, the data format of 8bit is broken up, reconfigured layout, on fixing carrier frequency,, specifically see also Fig. 6 according to the positive and negative variation of totally eight amplitudes of corresponding relation generation of code element-amplitude by new symbol format in when modulation; Separate timing and carry out contrary operation, change according to different amplitude and find corresponding code element, the form according to 8bit recovers again.
In the present embodiment, data flow is mapped to the symbol of eight level, the corresponding symbol of per three bits, and its mapping relations are following:
| Bit | 000 | 001 | 010 | 011 | 100 | 101 | 110 | 111 |
| Symbol | +7 | +5 | +3 | +1 | -1 | -3 | -5 | -7 |
In the present embodiment, the filtering amplification module 5 concrete raised cosine low pass filters that adopt are realized concrete the definition as follows:
B=0.2 wherein, T is the time width of code element.
Because the utility model has adopted above technical scheme; The wireless narrow band modem of processing is compared with prior art had the following advantages: simple and clear data frame structure increases the small amount of redundancy sign indicating number and carries out the error code in forward error correction coding and the interweaving encoding reduction transmission, the correctness and the fail safe that have improved transfer of data; Adopt synchronous transfer module to improve efficiency of transmission; The employing amplitude is the frequency modulation pattern of information carrier, has reduced taking of bandwidth effectively, and whole proposal has high reliability and characteristics cheaply; And it is succinctly convenient to implement, and helps a large amount of deployment.
Though the utility model with preferred embodiment openly as above; But it is not to be used for limiting the utility model; Any those skilled in the art are in spirit that does not break away from the utility model and scope; Can make possible change and modification, so the protection range of the utility model should be as the criterion with the scope that the utility model claim is defined.
Claims (10)
1. the wireless narrow band modem of level is characterized in that, comprising: interface module, logic and control module, coding/decoding module, modulation module and filtering amplification module,
Said interface module and external data source are with said logic and control module is two-way is connected; Carry out the signal transfer of said external data source and logic and control module; Said interface module and external radio frequency module and said two-way connection of filtering amplification module are carried out the signal transfer of said external radio frequency module and filtering amplification module;
Said logic and control module also are connected with said coding/decoding module is two-way; Transmission data-signal to from said interface module is prevented trembling, be sent to said coding/decoding module after the shaping, and the reception data-signal from said coding/decoding module is carried out being forwarded to said interface module after validity is judged;
Said coding/decoding module also with said two-way connection of modulation module; The back generation of encoding from the transmission data-signal of said logic and control module is treated modulation signal and is sent to said modulation module, the back of decoding from the restituted signal of said modulation module is produced said reception data-signal and is sent to said logic and control module;
Said modulation module also with said two-way connection of filtering amplification module; To from said coding/decoding module treat that modulation signal carries out producing modulation signal after eight level modulation and being sent to said filtering amplification module, the signal to be demodulated from said filtering amplification module is carried out producing restituted signal and being sent to said coding/decoding module after eight level demodulation;
Said filtering amplification module carries out filtering and amplifies the back producing the transmission radiofrequency signal and transferring to said external radio frequency module through said interface module to the modulation signal from said modulation module to carrying out filtering from the radiofrequency signal of said interface module and amplifying the said signal to be demodulated of back generation.
2. the wireless narrow band modem of eight level according to claim 1; It is characterized in that; Said interface module comprises data-interface and COBBAIF, and said data-interface and said external data source are with logic and control module is two-way is connected, and realize the signal transfer of said external data source and logic and control module; Said COBBAIF is connected with the filtering amplification module is two-way with said external radio frequency module, realizes the signal transfer of said external radio frequency module and filtering amplification module.
3. the wireless narrow band modem of eight level according to claim 2; It is characterized in that; Said interface module also comprises the control signal interface; Said control signal interface receives the control signal of said external data source and forwards it to said logic and control module, and said logic and control module are controlled the opening and closing of said external radio frequency module according to said control signal.
4. the wireless narrow band modem of eight level according to claim 3 is characterized in that, said logic and control module are also talked about switching and/or controlled said COBBAIF opening and closing according to said control signal actual figure.
5. the wireless narrow band modem of eight level according to claim 3 is characterized in that,
Said data-interface comprises signal sending end, signal receiving end and request of data transmission signal end;
Said COBBAIF comprises signal sending end, modulation signal receiving terminal, voice signal end and Mike's signal end;
Said control signal interface comprises that the radio station receives control signal end, radio station control signalling end, received field strength signal end and call request signal end.
6. the wireless narrow band modem of eight level according to claim 2; It is characterized in that; Said filter amplification circuit comprises first filter amplification circuit and second filter amplification circuit; Said second filter amplification circuit receives from the received RF signal of said COBBAIF and carries out filtering and amplification, and said first filter amplification circuit receives from the modulation signal of said modulation module and carries out filtering and amplification.
7. the wireless narrow band modem of eight level according to claim 1; It is characterized in that; Said coding/decoding module also adds the redundant correcting information and/or the scrambler that interweaves in from the transmission data-signal of said logic and control module, and the restituted signal from said modulation module is carried out reverse trellis decoded and/or error correction recovery.
8. the wireless narrow band modem of eight level according to claim 1; It is characterized in that said modulation module is to treating that from said coding/decoding module modulation signal carries out eight level modulation and comprises: convert the said modulation signal of treating into warbled eight level of changes in amplitude modulation signal.
9. the wireless narrow band modem of eight level according to claim 1 is characterized in that, also is included as the power module of said interface module, logic and control module, coding/decoding module, modulation module and the power supply of filtering amplification module.
10. the wireless narrow band modem of eight level according to claim 9 is characterized in that, the filter capacitor that said power module comprises linear voltage decreasing adjustment pipe and is connected in this linear voltage decreasing adjustment pipe input/output terminal.
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| CN2011203000664U CN202261512U (en) | 2011-08-17 | 2011-08-17 | Eight-level wireless narrow band modem |
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| CN2011203000664U CN202261512U (en) | 2011-08-17 | 2011-08-17 | Eight-level wireless narrow band modem |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103905144A (en) * | 2012-12-27 | 2014-07-02 | 上海协同科技股份有限公司 | 16-level high-speed narrow-band modem |
| CN111181658A (en) * | 2019-12-26 | 2020-05-19 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Communication test system |
-
2011
- 2011-08-17 CN CN2011203000664U patent/CN202261512U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103905144A (en) * | 2012-12-27 | 2014-07-02 | 上海协同科技股份有限公司 | 16-level high-speed narrow-band modem |
| CN103905144B (en) * | 2012-12-27 | 2018-11-23 | 上海协同科技股份有限公司 | 16 level high-speed narrow-band modems |
| CN111181658A (en) * | 2019-12-26 | 2020-05-19 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Communication test system |
| CN111181658B (en) * | 2019-12-26 | 2022-09-16 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Communication test system |
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