CN101562876A - Transmitter and signal inhibition method - Google Patents
Transmitter and signal inhibition method Download PDFInfo
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- CN101562876A CN101562876A CNA2009101074459A CN200910107445A CN101562876A CN 101562876 A CN101562876 A CN 101562876A CN A2009101074459 A CNA2009101074459 A CN A2009101074459A CN 200910107445 A CN200910107445 A CN 200910107445A CN 101562876 A CN101562876 A CN 101562876A
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Abstract
The invention is applicable to the communication field and provides a transmitter and a signal inhibition method. The transmitter comprises a digital signal generator used for memorizing at least one digital signal local oscillator source and generating multipath digital signals by the digital signal local oscillator source, a digital/analogue conversion module used for converting the multipath digital signal generated by the digital signal generator into an analogue intermediate frequency signal in a digital/analogue way, a mixer used for converting the analogue intermediate frequency signal converted by the digital/analogue conversion module into a radiofrequency signal, a power amplifier used for amplifying the power of the radiofrequency signal output by the mixer, and an antenna used for emitting the radiofrequency signal with the power amplified by the power amplifier. The transmitter establishes a digital signal generator by a field programmable gate array and realizes that the transmitter emits the multipath multi-frequency radiofrequency signals, and the transmitter comprising the digital signal generator can be also applied to interference signal inhibition, and has low cost and strong practicability.
Description
Technical field
The invention belongs to the communications field, relate in particular to a kind of transmitter and signal inhibition method.
Background technology
At present, the work of 2G radio network optimization is faced with some difficult problems and remains unsolved, along with number of users increases, dwindling of base station coverage distance, in some overlay areas, can there be the common situation about existing of a plurality of cell signals in channeling degree height, when the user converses in this zone, can produce switching problem, increase the load of base station, simultaneously, consequent ping-pong causes conversing unintelligible, at borderline region, different lane place codings (location Area Code, LAC) signal roaming are arranged, for example: A is the different belonging area networks of identical standard with B, its belonging area network of certain user is A, when roaming into the ownership place of network B, if can also receive the signal of network A, then can influence network B and obtain this roaming client, also can cause user's expense to increase.In addition,, in skyscraper, tend to receive, produce pilot pollution from a plurality of signal of base station because the coverage condition of high spacing wave is complicated more.
The phenomenons such as roaming of coming height to cause more along with the density of network are more and more serious, at the problems referred to above, cover good, purposes such as speech is clear, call completing rate height in order to make network reach, global system for mobile communications (Global System for Mobile Communications, GSM), dcs (DistributedControl System, DCS) mobile communication network optimization normally by adjusting the base station parameter or the network configuration of network, is adjusted frequency, power or even the antenna azimuth of adjacent base station.And network density is too high, makes such adjustment be difficult to comprehensive care and arrives, if adjust base station parameter by big net, can cause some zones to be affected again.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of transmitter, be intended to solve the prior art radiofrequency signal repeat the overlay area can not proper communication, the problem of making troubles to the user.
The embodiment of the invention is achieved in that a kind of transmitter, comprising:
Digital signal generator is used to store at least one digital code book vibration source, generates the multi-path digital signal by the digital signal local vibration source;
D/A converter module is used for the multi-path digital signal digital-to-analogue that described digital signal generator generates is converted to analog if signal;
Frequency mixer is used for exporting after analog if signal with the conversion of described D/A converter module is converted to radiofrequency signal;
Power amplifier is used for the radiofrequency signal of described frequency mixer output is carried out power amplification;
Antenna is used to launch the radiofrequency signal after described power amplifier carries out power amplification.
Another purpose of the embodiment of the invention is to provide a kind of signal inhibition method, and method may further comprise the steps:
Generate the digital signal that equates with the frequency of waiting to suppress signal by digital signal generator;
With described digital signal analog-converted is analog if signal;
Described analog if signal is carried out mixing, be converted to radiofrequency signal;
Described radiofrequency signal is carried out power amplification;
Launch described radiofrequency signal by antenna.
The present invention generates the multi-path digital signal by digital signal generator, through D/A converter module multi-path digital signal digital-to-analogue is converted to analog if signal, frequency mixer is converted to radiofrequency signal with analog if signal, after power amplifier carries out the power prosperity to radiofrequency signal, the antenna emitting radio frequency signal is to the area of coverage, realized transmitter emission multichannel multi-frequency band radio-frequency signal, and utilize field programmable gate array to set up digital signal generator, the transmitter that comprises this digital signal generator also can be applicable to the optimization of different network formats, effectively suppress interference signal, cost is low, and is practical.
Description of drawings
Fig. 1 is the structure chart of the transmitter that provides of first embodiment of the invention;
Fig. 2 is the structure chart of the two-band transmitter that provides of second embodiment of the invention;
Fig. 3 is the structure chart of the digital signal generator that provides of the embodiment of the invention;
Fig. 4 is the flow chart of the signal inhibition method that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
In embodiments of the present invention, generate the multi-path digital signal by digital signal generator, through D/A converter module multi-path digital signal digital-to-analogue is converted to analog if signal, frequency mixer is converted to radiofrequency signal with analog if signal, after power amplifier carries out the power prosperity to described radiofrequency signal, the antenna emitting radio frequency signal is to the area of coverage, realized transmitter emission multichannel multi-frequency band radio-frequency signal, the present invention utilizes field programmable gate array to set up digital signal generator, the transmitter that comprises this digital signal generator also can be applicable to the optimization of different network formats, effectively suppress interference signal, cost is low, and is practical.
Fig. 1 shows the structure of the transmitter that first embodiment of the invention provides.
Transmitter comprises digital signal generator 11, D/A converter module 12, frequency mixer 13, power amplifier 14 and antenna 15.
In first embodiment of the invention, at least one digital code book vibration source of digital signal generator 11 storages, by sending D/A converter module 12 behind the digital signal local vibration source generation multi-path digital signal, the digital signal digital-to-analogue conversion that D/A converter module 12 generates digital signal generator 11 is to send to frequency mixer 13 behind the analog if signal, the analog if signal that frequency mixer 13 is changed D/A converter module 12 sends to power amplifier 14 back outputs after being converted to radiofrequency signal, power amplifier 14 carries out the radiofrequency signal of frequency mixer 13 outputs to send to antenna 15 after the power amplification, and antenna 15 emission power amplifiers 15 carry out the radiofrequency signal after the power amplification.
Fig. 2 shows the structure of the two-band transmitter that second embodiment of the invention provides.
Please be simultaneously with reference to Fig. 1, in second embodiment of the invention, the digital signal local vibration source of digital signal generator 11 storages comprises the digital signal local vibration source of GSM frequency range and the digital signal local vibration source of DCS frequency range, the digital signal of D/A converter module 22 conversions comprises GSM and DCS frequency band signals, frequency mixer comprises GSM frequency mixer 231 and DCS frequency mixer 232, power amplifier comprises GSM power amplifier 241 and DCS power amplifier 242, at this moment, the two-band transmitter also should comprise dual-frequency channel merger 25, and dual-frequency channel merger 25 carries out GSM power amplifier 241 and DCS power amplifier 242 to send to antenna 26 after radiofrequency signal after the power amplification is closed the road.
In embodiments of the present invention, digital signal generator 11 comprises:
Frequency setting module is used to be provided with the frequency of the multi-path digital signal that digital signal generator generates.
In actual applications, transmitter also needs the amplitude of digital signal is handled, and at this moment, digital signal generator 11 also comprises:
Gain control module, the amplitude of the digital signal after being used for frequency setting module is provided with is carried out gain controlling, makes the amplitude of digital signal equal the expectation amplitude.
Wherein, radiofrequency signal is the multi-frequency band radio-frequency signal.Be not limited to GSM, DCS two-band radiofrequency signal, its specific implementation process repeats no more.
At at present along with the density of network is come height more, overlapping covering phenomenon between neighbor cell, indoor and outdoor and the zones of different network, the embodiment of the invention is used for GSM, DCS mobile communication network optimization with transmitter, wherein, predeterminated frequency can be a frequency of waiting to suppress signal, and default amplitude is to wait to suppress the amplitude of signal.For example, for GSM and DCS standard, must there be a Broadcast Control Channel (Broadcast Control Channel each sub-district, BCCH) carrier frequency has wherein comprised all information of sub-district and base station, when any terminal will insert, at first correct demodulation BCCH information, the GSM that the embodiment of the invention provides, DCS two-band numeral pilot beacon transmitter mainly are the unnecessary BCCH in the emission area of coverage, do not produce any influence for useful BCCH, thereby reach the effect of the network optimization.
In embodiments of the present invention, digital signal generator 11 is by field programmable gate array (Field-Programmable Gate Array, FPGA) realize, FPGA comprises read-only memory (Read-OnlyMemory, ROM), Digital Up Convert (Digital Up Converter, DUC) module, gain control module and digital adder, wherein, utilize a fpga chip can produce greater than 32 pilot frequency sequences, cost is low, easily realizes, the number of the radiofrequency signal of transmitter emission increases greatly, the selection of frequency range is more wider, and performance is greatly improved, and has very strong practicality.When digital signal generator included only a fpga chip, Fig. 3 showed the structure of the digital signal generator that the embodiment of the invention provides.
Introduce the action of each module of GSM that the embodiment of the invention provides, DCS two-band numeral pilot beacon transmitter below in detail:
(1) ROM:ROM stores a plurality of information sources and produces thing, produces many group derived digital signals.
When concrete the application, ROM can also store the waveform of the signal in the external world, directly the waveform of storage is launched as signal when in use.Its frequency accuracy can reach 0.01ppm.Compare the signal source that analog form produces, the signal source that ROM produces can dispose by software flexible, can produce multiple signals fast, and easily realizes.
(2) the multi-path digital signal source that produces of DUC:ROM multiplies each other with corresponding DUC respectively, realizes the moving of frequency, filtering, thereby obtains the digital signal that equates with the frequency of waiting to suppress signal.
(3) gain control module: according to the amplitude data of waiting to suppress signal of FPGA storage inside, amplitude to the digital signal of DUC output is carried out gain controlling, for example the numeral that surpasses the amplitude wait to suppress signal is decayed and promptly multiply by the pad value of setting, realize that output amplitude is the expectation amplitude, wherein expectation amplitude is according to the amplitude decision of waiting to suppress signal, by the user detect voluntarily wait to suppress the amplitude of signal after, by user interface program an expectation amplitude is set.
(4) digital adder: for the economize on hardware cost, the synthetic back of the multi-path digital signal of gain control module output is being outputed to D/A converter module D/A module, making and share the D/A module.
(5) D/A module: the digital signal after will suing for peace is carried out the D/A conversion, is converted to analog if signal;
(6) frequency mixer: just the analog if signal of D/A module output is converted to radiofrequency signal.
(7) power amplifier: the small-signal power output behind the analog frequency mixing is lower, amplifies by power amplifier.Power amplifier can be provided with different amplifying powers according to the actual conditions of network requirement.
(8) dual-frequency channel merger: through GSM900 signal and the DCS1800 signal after the power amplifier amplification,, signal is sent into antenna-feedback system, so just finished the pilot beacon emission by a dual-frequency channel merger.
The user can be by the interface setting of being correlated with, each 16 any channel number in GSM and the DCS band limits for example can be set, frequency point number is calculated as IF-FRE, the frequency of RF spot correspondence is deducted local frequency to get final product, the pad value that each channel is a digital signal can also be set, simultaneously, the intermodulation product level when existing in order to reduce by two frequency range radiofrequency signals can also utilize the GSM Feed Forward Power Amplifier to satisfy the intermodulation index request.
In embodiments of the present invention, by digitized emission frequency, can on an equipment, launch 32 pilot beacon frequencies.These frequencies have promptly comprised the frequency of GSM 900, the frequency that has comprised DCS 1800 again, if the frequency of last radiofrequency signal has taken the BCCH frequency of appointment, the service of this frequency and sub-district, place all can't normally be used so, need not adjust whole network, greatly optimize the 2G network.This numeral pilot beacon transmitter can be used and indoor distributed system, also can use and outdoor compartment system.In indoor distributed system, after the pilot beacon transmitter can close the road with base station or repeater, will transmit was distributed to each antenna, in outdoor compartment system, the pilot beacon transmitter equally can be earlier and base station or repeater He Lu, and signal is introduced antenna, effectively network is improved.
Following table shows the GSM that the embodiment of the invention provides, the functional description of DCS two-band numeral pilot beacon transmitter.
| Sequence number | Function | Describe |
| 1 | Frequency point setting | Being provided with needs to disturb the frequency list of frequency, and GSM frequency range and DCS frequency range are each 16 at most |
| 2 | The pilot beacon cycle is provided with | The cycle of dummy pilot signal emission is set |
| 3 | The pilot beacon duration is provided with | The duration of the each emission of dummy pilot signal is set |
| 4 | The frequency switch | The switch of each frequency output signal is set |
| 5 | Decay is provided with | After decay was set, power output was that 40dBm deducts pad value.It is 0-31dB that scope can be set. |
| 6 | The power output inquiry | Inquire about current real output (comprising GSM and DCS frequency range) |
| 7 | BCCH inquires about automatically | Can inquire about BCCH, the adjacent BCCH and the power that monitor that SIM card is used among the MODEM |
| 8 | The alarm of pilot beacon source | If monitor that MODEM can log on certain not BCCH frequency on pilot beacon frequency list of frequency, then produce this alarm |
| 9 | The losing lock alarm of mixing unit | If local GSM, DCS mixing unit losing lock then produce alarm |
| 10 | Remote alarm | After local the alarm, MODEM sends to network management center by |
| 11 | Long-range, local maintenance | Can be by the parameter of long-range or local setting or inquiry 1-9 item |
Fig. 4 shows the handling process of the signal inhibition method that the embodiment of the invention provides.
In step S401, generate the multi-path digital signal that equates with the frequency of waiting to suppress signal by digital signal generator;
In step S402, be analog if signal with the digital signal digital-to-analogue conversion;
In step S403, analog if signal is carried out mixing, be converted to radiofrequency signal;
In step S404, radiofrequency signal is carried out power amplification;
In step S405, emitting radio frequency signal.
In embodiments of the present invention, step S401 is specially: the frequency that the digital signal of digital signal generator generation is set equals to wait to suppress the frequency of signal.Step S401 also comprises: according to waiting that the amplitude that suppresses signal carries out gain controlling to the amplitude of digital signal, make the amplitude of digital signal equal the expectation amplitude.
During concrete the application, radiofrequency signal can be the multi-frequency band radio-frequency signal, for example GSM, DCS two-band signal, when the digital signal of digital signal that generates the GSM frequency range that multichannel equates with the frequency of waiting to suppress signal by digital signal generator and DCS frequency range:
Step S402 is specially: the digital signal of GSM frequency range and the digital signal analog-converted of DCS frequency range are the analog if signal of GSM frequency range and divide the analog if signal of DCS frequency range;
Step S403 is specially: respectively the analog if signal of GSM frequency range and the analog if signal of DCS frequency range are carried out mixing, be converted to the radiofrequency signal of GSM frequency range and the radiofrequency signal of DCS frequency range;
Step S404 is specially: respectively the radiofrequency signal of GSM frequency range and the radiofrequency signal of DCS frequency range are carried out power amplification;
After step S404, signal inhibition method also comprises:
After closing the road, the radiofrequency signal that will carry out the radiofrequency signal of the GSM frequency range after the power amplification and DCS frequency range sends to antenna.
In embodiments of the present invention, number generator is realized that by FPGA radiofrequency signal is not limited to GSM, DCS two-band radiofrequency signal, and its specific implementation process does not repeat them here.
In embodiments of the present invention, utilize field programmable gate array to set up digital signal generator, generate the multi-path digital signal by digital signal generator, through D/A converter module multi-path digital signal digital-to-analogue is converted to analog if signal, frequency mixer is converted to radiofrequency signal with analog if signal, after power amplifier carries out the power prosperity to radiofrequency signal, the antenna emitting radio frequency signal is to the area of coverage, realized transmitter emission multichannel multi-frequency band radio-frequency signal, the transmitter that comprises this digital signal generator also can be applicable to the optimization of different network formats, has taken into full account user's demand, effectively suppresses interference signal, cost is low, and practicality is very strong.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, a kind of transmitter is characterized in that, described transmitter comprises:
Digital signal generator is used to store at least one digital code book vibration source, generates the multi-path digital signal by the digital signal local vibration source;
D/A converter module is used for the multi-path digital signal digital-to-analogue that described digital signal generator generates is converted to analog if signal;
Frequency mixer is used for exporting after analog if signal with the conversion of described D/A converter module is converted to radiofrequency signal;
Power amplifier is used for the radiofrequency signal of described frequency mixer output is carried out power amplification;
Antenna is used to launch the radiofrequency signal after described power amplifier carries out power amplification.
2, transmitter as claimed in claim 1 is characterized in that, described digital signal generator is realized by field programmable gate array.
3, transmitter as claimed in claim 1 or 2 is characterized in that, described digital signal local vibration source comprises the digital signal local vibration source of GSM frequency range and the digital signal local vibration source of dcs frequency range;
Described frequency mixer comprises GSM frequency mixer and dcs frequency mixer;
Described power amplifier comprises GSM power amplifier and dcs power amplifier;
Described transmitter also comprises:
Mixer is used for described GSM power amplifier and dcs power amplifier are carried out sending to described antenna after radiofrequency signal after the power amplification is closed the road.
4, transmitter as claimed in claim 1 or 2 is characterized in that, described digital signal generator comprises:
Frequency setting module, the frequency that is used to be provided with the digital signal that described digital signal generator generates equals predeterminated frequency.
5, transmitter as claimed in claim 4 is characterized in that, described digital signal generator also comprises:
Gain control module, the amplitude of the digital signal after being used for frequency setting module is provided with is carried out gain controlling, makes the amplitude of described digital signal equal the expectation amplitude.
6, a kind of signal inhibition method is characterized in that, described method comprises:
Generate the digital signal that equates with the frequency of waiting to suppress signal by digital signal generator;
With described digital signal analog-converted is analog if signal;
Described analog if signal is carried out mixing, be converted to radiofrequency signal;
Described radiofrequency signal is carried out power amplification;
Launch described radiofrequency signal by antenna.
7, method as claimed in claim 6 is characterized in that, it is characterized in that, described digital signal generator is realized by field programmable gate array.
As claim 6 or 7 described methods, it is characterized in that 8, the described step that generates the digital signal that equates with the frequency of waiting to suppress signal by digital signal generator is specially:
Generate the digital signal of the GSM frequency range that multichannel equates with the frequency of waiting to suppress signal and the digital signal of dcs frequency range by digital signal generator;
The described step that is analog if signal with described digital signal analog-converted is specially:
With the digital signal of described GSM frequency range and the digital signal analog-converted of dcs frequency range is the analog if signal of GSM frequency range and the analog if signal of dcs frequency range;
Described described analog if signal is carried out mixing, the step that is converted to radiofrequency signal is specially:
Respectively the analog if signal of described GSM frequency range and the analog if signal of dcs frequency range are carried out mixing, be converted to the radiofrequency signal of GSM frequency range and the radiofrequency signal of dcs frequency range;
The described step that described radiofrequency signal is carried out power amplification is specially:
Respectively the radiofrequency signal of described GSM frequency range and the radiofrequency signal of dcs frequency range are carried out power amplification;
After the described step of described radiofrequency signal being carried out power amplification, described method also comprises:
Send to antenna after the radiofrequency signal of described radiofrequency signal of carrying out the GSM frequency range after the power amplification and dcs frequency range closed the road.
As claim 6 or 7 described methods, it is characterized in that 9, the described step that generates the digital signal that equates with the frequency of waiting to suppress signal by digital signal generator comprises:
The frequency that the digital signal of described digital signal generator generation is set equals the described frequency of waiting to suppress signal.
10, method as claimed in claim 9 is characterized in that, the described step that generates the digital signal that equates with the frequency of waiting to suppress signal by digital signal generator also comprises:
According to the described amplitude that suppresses signal of waiting the amplitude of described digital signal is carried out gain controlling, make the amplitude of digital signal equal the expectation amplitude.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2009101074459A CN101562876A (en) | 2009-05-19 | 2009-05-19 | Transmitter and signal inhibition method |
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| CNA2009101074459A CN101562876A (en) | 2009-05-19 | 2009-05-19 | Transmitter and signal inhibition method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103648121A (en) * | 2013-12-26 | 2014-03-19 | 中国电子科技集团公司第四十一研究所 | Method for signal detection of mobile terminal and monitoring of terminal equipment and device |
| CN106301640A (en) * | 2016-08-16 | 2017-01-04 | 深圳市航盛电子股份有限公司 | A kind of MCVF multichannel voice frequency transmission method based on FM modulation frequency mixing technique |
| CN106338653A (en) * | 2016-11-01 | 2017-01-18 | 国家电网公司 | Typical interference simulator of partial discharge |
-
2009
- 2009-05-19 CN CNA2009101074459A patent/CN101562876A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103648121A (en) * | 2013-12-26 | 2014-03-19 | 中国电子科技集团公司第四十一研究所 | Method for signal detection of mobile terminal and monitoring of terminal equipment and device |
| CN106301640A (en) * | 2016-08-16 | 2017-01-04 | 深圳市航盛电子股份有限公司 | A kind of MCVF multichannel voice frequency transmission method based on FM modulation frequency mixing technique |
| CN106338653A (en) * | 2016-11-01 | 2017-01-18 | 国家电网公司 | Typical interference simulator of partial discharge |
| CN106338653B (en) * | 2016-11-01 | 2023-08-08 | 国家电网公司 | Partial discharge typical interference simulation device |
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Open date: 20091021 |