CN201118570Y - A signal restrainer based on digital middle frequency processing - Google Patents
A signal restrainer based on digital middle frequency processing Download PDFInfo
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- CN201118570Y CN201118570Y CNU2007200558494U CN200720055849U CN201118570Y CN 201118570 Y CN201118570 Y CN 201118570Y CN U2007200558494 U CNU2007200558494 U CN U2007200558494U CN 200720055849 U CN200720055849 U CN 200720055849U CN 201118570 Y CN201118570 Y CN 201118570Y
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Abstract
The utility model discloses a signal suppressor based on digital medium frequency processing, comprising a multi-carrier baseband signal source module used for producing interference signals, a high-speed DAC module, an inductance-capacitance filter, a mixer module, a first-grade amplifier module, a second-grade amplifier module and antennas; wherein the multi-carrier baseband signal source module is connected with the antennas through the high-speed DAC module, the inductance-capacitance filter, the mixer module, the first-grade amplifier module and the second-grade amplifier module in sequence. The signal suppressor of the utility model can effectively interfere in multiple carriers and is applicable to the GSM / CDMA / CDMA2000 / WCDMA / TD-SCDMA communication systems.
Description
Technical field
The utility model relates to the Mobile communication direct base station field, particularly a kind of signal suppressing device based on Digital IF Processing.
Background technology
In recent years, the mobile communication cause was very fast in China's development, and mobile communications network covers the whole nation substantially.Owing in the border land in adjacent provinces and cities district,, cause the false growth of local user's expense, cause customer complaint often because a certain side's base station signal causes the other side's local handset to be in roaming state excessively by force.In order to build the mobile communication overlay network of high-quality, just need address this problem.The signal to the other side disturbs in this locality to adopt the signal suppressing device, and making the local user can not use nonlocal carrier wave to converse is an effective method, can effectively address this problem rapidly.Its investment of signal suppressing device is little, stable performance, and the speed of building a station is fast, and is low to environmental requirement, and installation and maintenance are easy, are the equipment that a kind of good signal disturbs.The signal suppressing device at first produces signal source, and by filtering, mixing is amplified, and closes Lu Ranghou by power amplifier, utilizes the antenna emission to cover the zone that needs to suppress signal.But need a plurality of carrier waves of base station be suppressed in actual applications.The method that solves is to adopt a plurality of narrow band filters, and a plurality of radio-frequency (RF) local oscillator different carrier modulation to the frequency that need carry out carrier suppressed, finish the interference of signal.
Channel is selected to finish by Surface Acoustic Wave Filter.When needs are selected a plurality of carrier wave, need multichannel frequency-selecting unit.Therefore in the multicarrier application scenario, employing sound table technology is carried out filtering and is had some problems and defective.At first employing sound table filter pass band squareness factor is bad, and is bad to the inhibition ability of out of band signal.Can produce spuiously outside the carrier wave passband, influencing reality does not need the carrier wave that suppresses.Cause the decline of speech quality, influence user's communication.Secondly in actual applications, because the nonlinear factor of power amplifier, the intermodulation of multi-carrier power amplifier is spuious excessive.The spuious meeting that produces drops in the band of mobile communication carrier, and these are spuious also can to influence the corresponding communication carrier wave.Like this must adopt independently that power amplifier could satisfy spuious requirement, but the rising that can bring cost again like this.Also can cause the increase of cost in addition, and the increasing of equipment volume.
The utility model content
The purpose of this utility model is to overcome the shortcoming and the deficiency of prior art, a kind of signal suppressing device based on Digital IF Processing is provided, this signal suppressing device can increase the carrier number of selecting according to the needs of network capacity, increase the number of its suppressed carrier, effectively realize multi-carrier communication, reduced the spuious of power amplifier output.
The purpose of this utility model is achieved through the following technical solutions: a kind of signal suppressing device based on Digital IF Processing, comprise the multicarrier baseband signal source module, high-speed DAC module, choke-condenser filter, mixer module, one-level amplifier module, secondary power amplification module, the antenna that are used to produce interference signal, described multicarrier baseband signal source module links to each other with antenna by high-speed DAC module, choke-condenser filter, mixer module, one-level amplifier module, secondary power amplification module successively.
Described multicarrier baseband signal source module comprises baseband signal generator, Digital Up Convert unit and merge cells, and described baseband signal generator is connected with merge cells by the Digital Up Convert unit.
In the utility model, a plurality of Digital Up Converts unit can be set as required.
Described Digital Up Convert unit is connected to form successively by FIR filtration module, interpolater, digital controlled oscillator, and described FIR filtration module is connected with baseband signal generator, and described digital controlled oscillator is connected with merge cells.
The utility model compared with prior art has following advantage and beneficial effect:
1, this signal suppressing device can increase the carrier number of selecting according to the needs of network capacity.Increase the number of its suppressed carrier.
2, signal generator of the present utility model has adopted the technology of digital intermediate frequency, divides multiplexing multi-carrier signal at the base band generation time, carries out filtering at numeric field, satisfies the outer inhibition of band requirement.Thereby effectively realized multicarrier, reduced the spuious of power amplifier output.
3, the utility model overcomes the existing conventional analog circuits generation multi-carrier signal that adopts, and out of band signal is suppressed not enough defective, produces the shortcoming of time-multiplexed signal difficulty.
4, the utility model improves level of integrated system, reduces the use of analogue device, thereby makes overloading signal suppressing device practical more.
Description of drawings
Fig. 1 is a theory diagram of the present utility model;
Fig. 2 is the block diagram of multicarrier base band sources in the utility model;
Fig. 3 is an embodiment of multicarrier base band sources in the utility model;
Fig. 4 is the input timing of the utility model base band sources.
Embodiment
Below in conjunction with drawings and Examples, the utility model is done detailed description further, but execution mode of the present utility model is not limited to this.
As shown in Figure 1, the signal suppressing device that the utility model provides, comprise baseband signal generator, the high-speed DAC module, choke-condenser filter, mixer module, the one-level amplifier module, the secondary power amplification module, antenna, described multicarrier baseband signal source module are successively by the high-speed DAC module, choke-condenser filter, mixer module, the one-level amplifier module, the secondary power amplification module links to each other with antenna, and described multicarrier baseband signal source module is by baseband signal generator, Digital Up Convert unit and merge cells connect to form successively, and wherein the Digital Up Convert unit can be provided with a plurality of according to actual needs.Wherein the high-speed DAC module can be the DAC of band interpolation functions, also can be not to be with interpolation functions DAC.The signal suppressing device that the utility model provides also comprises clock module, power module, monitoring module, and wherein power module and multicarrier baseband signal source module, high-speed DAC module, mixer module, one-level amplifier module, secondary power amplification module, clock module, monitoring module are electrically connected; Wherein monitoring module is connected with multicarrier baseband signal source module, high-speed DAC module, mixer module, one-level amplifier module, secondary power amplification module, clock module signal; Clock module is connected with multicarrier baseband signal source module, high-speed DAC module, mixer module signal.
Principle of the present utility model is: baseband signal generator produces frequency interference signal in the multi-carrier digital, by the high-speed DAC module converts is analog if signal, analog if signal is outer spuious through choke-condenser filter filtering in-band harmonic and band, frequency mixer is transferred to radio frequency with choke-condenser filter output, radiofrequency signal is amplified to suitable power through the one-level amplifier module, the secondary power amplification module amplifies radiofrequency signal, again by antenna emission interference signal.Wherein power module is multicarrier baseband signal source module, high-speed DAC module, mixer module, one-level amplifier module, secondary power amplification module, clock module, monitoring module power supply, monitoring module then monitors the operating state of baseband signal generator, high-speed DAC module, mixer module, one-level amplifier module, secondary power amplification module, clock module signal, and clock module provides the system works clock for multicarrier baseband signal source module, high-speed DAC module, mixer module.
As shown in Figure 2, the multicarrier base band sources is made up of baseband signal generator, a plurality of Digital Up Converts unit and merge cells.The operation principle of multicarrier base band sources is: (for example input signal 1 for the multichannel input signal that the input signal generation unit produces, input signal 2, input signal 3 ... input signal n), respectively by the FIR low pass filter, last and the digital controlled oscillator of interpolater multiplies each other and forms carrier wave digital medium-frequency signal separately, last on the road of closing that numeric field is finished in the merge cells addition, the output of merge cells directly send high-speed DAC to carry out digital-to-analogue conversion.Can increase the number of interfering frequency by increasing the Digital Up Convert unit, thereby realize that more multichannel carrier disturbs, the Digital Up Convert unit here can use special chip (such as the GC5018 of TI company, the AD6633 of ADI company) realizing, also can be to realize Digital Up Convert in fpga chip.
Embodiment 1
As shown in Figure 3, Figure 4, baseband signal generator produces the multicarrier baseband signal, and the baseband signal here is made of I, Q two paths of signals.The production method of the multicarrier base band sources that the utility model provides is:
(1) count initialized device CNT=0, counting step are T, and (for example T can be set to 127 or 256) cycle count can be set arbitrarily as required.
(2) as t0＜CNT＜t1, input signal 1 is sent into data, otherwise input signal is 0;
(3) as t2＜CNT＜t3, input signal 2 is sent into data, otherwise input signal is 0;
(4) as t4＜CNT＜t5, input signal 3 is sent into data, otherwise input signal is 0;
(5) as t6＜CNT＜t7, input signal 4 is sent into data, otherwise input signal is 0;
Wherein input signal 1; input signal 2; input signal 3; there is certain protection at interval between the input signal 4, input signal 1, input signal 2; input signal 3; input signal 4 is respectively by the FIR filtration module, and the last and digital controlled oscillator of interpolater multiplies each other and forms carrier wave digital medium-frequency signal separately, and is last on the road of closing that numeric field is finished in the merge cells addition.Input signal can be a noise signal, the signal of any types such as modulation signal, and period T, amplitude, protection are at interval, and the input signal pulse duration is programmable.The duration of described pulse and amplitude and power output are directly proportional, and the intermodulation that the at interval big more power amplifier output of protection produces is just more little, and amplitude is big more, and the duration, long more power was also big more.As preferred version, the protection of the input signal of the utility model design is at interval from 0.25us being the step footpath, the longest 20us that reaches; The pulse amplitude of input signal is adjustable continuously from 0-1024; The duration of input signal is the step footpath with 0.25us, the longest 20us that reaches; The cycle of input signal is 33us.
Provide the specific implementation of GSM 4 carrier-in-interference devices in conjunction with Fig. 1, Fig. 3 and Fig. 4.Each carrier wave of GSM has 8 time slots, and the duration of each time slot is about 577us.The base band sources signal period is set to 32us.
The pulse duration of each input signal is 5us, and protection is spaced apart 3us.The corresponding satisfied face die plate requirement down of the amplitude of the low pass filter of FIR.
Off-center frequency 〉=200kHz: 〉=45dB
Off-center frequency 〉=400kHz: 〉=60dB
Off-center frequency 〉=1MHz: 〉=70dB
Protection at interval mainly is that filter output has certain hangover, if two carrier waves occur simultaneously and intensity is all bigger, the third order intermodulation of Chan Shenging is bigger so, is with interior spuious other carrier waves that influences.
The speed of input signal is 4MHz, and the counter cnt maximum is 127.Therefore the pulse of 5us accounts for 20 input points.Cycle accounts for 128 points altogether, and protection accounts for 12 points at interval.
1) count initialized device CNT=0, counting step is T, wherein T is set to 127.Cycle count.
2) when 0＜CNT＜19, input signal 1 is sent into data, otherwise input signal is 0;
3) when 32＜CNT＜51, input signal 1 is sent into data, otherwise input signal is 0;
4) when 64＜CNT＜83, input signal 2 is sent into data, otherwise input signal is 0;
5) when 115＜CNT＜127, input signal 3 is sent into data, otherwise input signal is 0;
After Digital Up Convert, just at f0, f1, f2, different interfering carriers has appearred in the timesharing of f3 frequency, has guaranteed timesharing to use the secondary power amplification module.By the high-speed DAC module converts is analog if signal.Analog if signal is outer spuious through choke-condenser filter filtering in-band harmonic and band.Choke-condenser filter output is transferred to the GSM radio-frequency head by frequency mixer, and the one-level amplifier module is amplified to suitable power to radiofrequency signal.The secondary power amplification module amplifies radiofrequency signal, antenna emission interference signal.
The foregoing description is the utility model preferred implementation; but execution mode of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present utility model and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within the protection range of the present utility model.
Claims (4)
1, a kind of signal suppressing device based on Digital IF Processing, it is characterized in that, comprise the multicarrier baseband signal source module, high-speed DAC module, choke-condenser filter, mixer module, one-level amplifier module, the secondary power amplification module that are used to produce interference signal, described multicarrier baseband signal source module links to each other with antenna by high-speed DAC module, choke-condenser filter, mixer module, one-level amplifier module, secondary power amplification module successively.
2, a kind of signal suppressing device according to claim 1 based on Digital IF Processing, it is characterized in that, described multicarrier baseband signal source module comprises baseband signal generator, Digital Up Convert unit and merge cells, described baseband signal generator is connected with merge cells by the Digital Up Convert unit.
3, a kind of signal suppressing device based on Digital IF Processing according to claim 2 is characterized in that described Digital Up Convert unit is a plurality of.
4, a kind of signal suppressing device according to claim 2 based on Digital IF Processing, it is characterized in that, described Digital Up Convert unit is connected to form successively by FIR filtration module, interpolater, digital controlled oscillator, described FIR filtration module is connected with baseband signal generator, and described digital controlled oscillator is connected with merge cells.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200558494U CN201118570Y (en) | 2007-08-21 | 2007-08-21 | A signal restrainer based on digital middle frequency processing |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2007200558494U CN201118570Y (en) | 2007-08-21 | 2007-08-21 | A signal restrainer based on digital middle frequency processing |
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| CN201118570Y true CN201118570Y (en) | 2008-09-17 |
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| CNU2007200558494U Expired - Fee Related CN201118570Y (en) | 2007-08-21 | 2007-08-21 | A signal restrainer based on digital middle frequency processing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104009764A (en) * | 2013-02-27 | 2014-08-27 | 联想(北京)有限公司 | Signal processing method and electronic equipment |
| CN106888027A (en) * | 2015-12-15 | 2017-06-23 | 台湾积体电路制造股份有限公司 | For the transmitter of radio frequency cross tie part RFI |
-
2007
- 2007-08-21 CN CNU2007200558494U patent/CN201118570Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104009764A (en) * | 2013-02-27 | 2014-08-27 | 联想(北京)有限公司 | Signal processing method and electronic equipment |
| CN106888027A (en) * | 2015-12-15 | 2017-06-23 | 台湾积体电路制造股份有限公司 | For the transmitter of radio frequency cross tie part RFI |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080917 Termination date: 20160821 |
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| CF01 | Termination of patent right due to non-payment of annual fee |