CN1862975A - Digital receiver - Google Patents
Digital receiver Download PDFInfo
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- CN1862975A CN1862975A CN 200610003154 CN200610003154A CN1862975A CN 1862975 A CN1862975 A CN 1862975A CN 200610003154 CN200610003154 CN 200610003154 CN 200610003154 A CN200610003154 A CN 200610003154A CN 1862975 A CN1862975 A CN 1862975A
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- pass filter
- intermediate frequency
- frequency band
- band pass
- digital
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Abstract
The invention relates to the digital receiver, it includes the broad band intermediate frequency filter and the narrowband intermediate frequency band-pass filter; on the common instance, the receiving multi carrier wave is loaded into the one loop of the said broad band frequency band-pass filter to process the filter treatment; when the disturbing signal making the receiving route of the digital receiver blocking, the received multi carrier wave signal can be switched to the narrowband intermediate frequency band-pass filter to process the filtering treatment. So the invention can improve the anti-jamming ability of the digital receiver; the receiving trend can be expanded, so the digital receiver can be used normally in the bad disturbing frequency or the area, and when the invention is applied into the base stage of the CDMA, WCDMA system, the sort of the base stage receiver can be reduced, the net building cost can be saved.
Description
Technical field
The present invention relates to the communications field, relate in particular to digital receiver.
Background technology
In modern wireless communication systems, along with the application of multi-transceiver technology and software radio, wideband digital receiver will be widely used in Modern Communication System, but wideband digital receiver is limited dynamically owing to analog to digital converter (A/D), and antijamming capability is relatively poor.And some frequency range and area are disturbed byer force at present, therefore need to improve the wideband digital receiver antijamming capability, reach and both can satisfy broadband reception, can be used for the purpose of reception of the signal in high interference frequency range area again.
Prior art related to the present invention has provided a kind of multi-carrier broadband digital receiver, it as shown in Figure 1, comprise radio frequency band filter, low noise amplifier, frequency mixer, Wideband Intermediate Frequency band pass filter, intermediate frequency amplifier, band pass filter, analog to digital converter, digital I, Q demodulator and digital filter, its operation principle is specific as follows:
The signal of receiving from air interface carries out frequency-selective filtering through radio frequency band filter, and carry out after low noise amplifies through low noise amplifier, give frequency mixer and carry out frequency conversion, pass through the Wideband Intermediate Frequency band pass filter then successively, intermediate frequency amplifier, band pass filter carries out the intermediate frequency amplification filtering to be handled, giving analog to digital converter (A/D) afterwards is digital signal with analog signal conversion, then will send into a plurality of DDC numeral I through the digital signal of conversion, the Q demodulator, solve the I of different carrier respectively, Q signal carries out giving Base-Band Processing after the filtering through digital filter respectively at last.
In the prior art, when receiving a plurality of carrier signal simultaneously, because the signal bandwidth broad that passes through the Wideband Intermediate Frequency band pass filter is (as 10MHz, signal bandwidth 1.25MHz), therefore the work that monkey chatter is suppressed can only be finished by digital filter, yet because digital filter is arranged on after the analog to digital converter, the size that has dynamically just determined the anti-near-end interference performance of wideband digital receiver of analog to digital converter like this, and the figure place that dynamically is subject to analog to digital converter of analog to digital converter, the theoretical of present 14 analog to digital converter is 84dB dynamically, and reality is 78dB effectively dynamically.Therefore there is following defective in prior art:
Inhibition to the neighboring trace high reject signal is relatively poor, and for more serious frequency range of interference ratio (as 450MHz) or area, broadband receiver can't normally use.
Summary of the invention
The purpose of this invention is to provide a kind of digital receiver, by the present invention, can strengthen the antijamming capability of digital receiver, and can expand reception dynamically, thereby digital receiver also can normally be used in interference ratio more serious frequency range or area, and be applied in CDMA (Code Division Multiple Access as the present invention, code division multiple access inserts), WCDMA (Wideband Code Division Multiple Access, Wideband Code Division Multiple Access (WCDMA) inserts) etc. in the base station of system the time, the kind of base station receiver can be reduced, thereby network construction cost can be saved.
The objective of the invention is to be achieved through the following technical solutions:
The invention provides a kind of digital receiver, comprise Wideband Intermediate Frequency band pass filter and narrowband intermediate frequency band pass filter;
Under the normal condition, place a road of described Wideband Intermediate Frequency band pass filter to carry out Filtering Processing the multi-carrier signal that receives; When interference signal is blocked the receive path of digital receiver, the multi-carrier signal that receives is switched to the narrowband intermediate frequency band pass filter carry out Filtering Processing.
Wherein said digital receiver also comprises: first switching device shifter and second switching device shifter;
Described first switching device shifter is arranged on the Wideband Intermediate Frequency band pass filter of digital receiver and the input of narrowband intermediate frequency band pass filter; Described second switching device shifter is arranged on the output of Wideband Intermediate Frequency band pass filter and narrowband intermediate frequency band pass filter.
Wherein, described first switching device shifter and second switching device shifter comprise: electronic switch.
Wherein, described digital receiver also comprises: radio frequency band filter, low noise amplifier and frequency mixer;
After digital receiver is received multi-carrier signal from air interface, after handling by radio frequency band filter, low noise amplifier, frequency mixer successively, send Wideband Intermediate Frequency band pass filter or narrowband intermediate frequency band pass filter to.
Wherein said digital receiver also comprises:
Intermediate frequency amplifier, band pass filter, analog to digital converter, digital demodulator and at least one digital filter;
Signal after process Wideband Intermediate Frequency band pass filter or narrowband intermediate frequency band pass filter are handled, sending intermediate frequency amplifier, band pass filter and analog to digital converter successively to handles, obtain digital signal, give successively then that digital demodulator carries out demodulation, digital filter carries out Filtering Processing, obtain baseband signal.
As seen from the above technical solution provided by the invention, digital receiver provided by the invention under normal circumstances, places a road of described Wideband Intermediate Frequency band pass filter to carry out Filtering Processing the multi-carrier signal that receives; When interference signal is blocked the receive path of digital receiver, the multi-carrier signal that receives is switched to the narrowband intermediate frequency band pass filter carry out Filtering Processing.Therefore by the present invention, can strengthen the antijamming capability of digital receiver, and can expand reception dynamically, thereby digital receiver also can normally be used in interference ratio more serious frequency range or area, and be applied in CDMA (Code DiVision Multiple Access as the present invention, code division multiple access inserts), WCDMA (Wideband Code DiVision Multiple Access, Wideband Code Division Multiple Access (WCDMA) inserts) etc. in the base station of system the time, the kind of base station receiver can be reduced, thereby network construction cost can be saved.
Description of drawings
Fig. 1 is the operation principle schematic diagram of multi-carrier broadband receiver in the prior art;
Fig. 2 is the operation principle schematic diagram of the digital receiver among the embodiment provided by the invention;
Fig. 3 is that signal and interference signal arrive spectrogram before the analog to digital converter by the Wideband Intermediate Frequency band pass filter among the embodiment provided by the invention;
Fig. 4 is that signal and interference signal arrive spectrogram before the analog to digital converter by the narrowband intermediate frequency band pass filter among the embodiment provided by the invention.
Embodiment
At digital receiver of the present invention, embodiment provided by the invention as shown in Figure 2, it comprises: radio frequency band filter, low noise amplifier, frequency mixer, Wideband Intermediate Frequency band pass filter, narrowband intermediate frequency band pass filter, first switching device shifter, second switching device shifter, intermediate frequency amplifier, band pass filter, analog to digital converter, digital IQ demodulator and digital filter.Described first switching device shifter and second switching device shifter can be electronic switches, also can be other devices with handoff functionality.
Comparison diagram 1 and Fig. 2 are as can be seen, this embodiment has increased narrowband intermediate frequency band pass filter, first switching device shifter and second switching device shifter on the basis of existing technology, and realizes the routing of narrowband intermediate frequency band pass filter and Wideband Intermediate Frequency band pass filter by first switching device shifter and second switching device shifter.
The operation principle of this embodiment is specific as follows:
Under the normal condition, first switching device shifter and second switching device shifter place a road of Wideband Intermediate Frequency band pass filter, make digital receiver be in the state that multi-carrier signal receives, as having provided the situation that receives 3 carrier waves simultaneously among Fig. 2.At this moment, digital receiver processing procedure to the received signal is as follows:
The signal of receiving from air interface carries out frequency-selective filtering through radio frequency band filter, and carry out after low noise amplifies through low noise amplifier, give frequency mixer and carry out frequency-conversion processing, give the Wideband Intermediate Frequency band pass filter then and carry out Filtering Processing, then pass through intermediate frequency amplifier successively, after band pass filter carries out the processing of intermediate frequency amplification filtering, giving analog to digital converter is digital signal with analog signal conversion, follow digital signal through a plurality of DDC numeral I, the Q demodulator, solve the I of different carrier respectively, Q signal carries out giving Base-Band Processing after the filtering through digital filter respectively at last.
When digital receiver being placed band interference more (as 450MHZ), interference signal is stronger, interference is positioned at neighboring trace, in the time of near the road, because digital neighboring trace filter is positioned at after the analog to digital converter in the digital receiver, the dynamic range of analog to digital converter is limited like this, as the theoretical of present 14 analog to digital converters is 84dB dynamically, and reality is 78dB effectively dynamically, and for the influence of CDMA signal consideration peak-to-average force ratio, actual linear dynamic has only 72dB.As shown in Figure 3, when the big 72dB of jam-to-signal signal is above, so as can be seen high reject signal is not suppressed, it makes the saturation condition that is in of analog to digital converter in the digital receiver, cause received signal to be compressed, be that receive path gets clogged, thereby make the digital receiver can't operate as normal.Digital receiver this moment processing procedure to the received signal can change:
To switch to a road of narrowband intermediate frequency band pass filter from the signal of frequency mixer output by described first switching device shifter and second switching device shifter handles, that is to say, to switch to from the signal of frequency mixer output and carry out Filtering Processing the narrowband intermediate frequency band pass filter, then by the control of second switching device shifter, it is sent to components and parts such as intermediate frequency amplifier and handle, send Base-Band Processing at last to.
When digital receiver carries out the single carrier reception by the narrowband intermediate frequency band pass filter, as shown in Figure 4 as can be seen, reduced neighboring trace, every extraneous interference such as roads, guarantee that A-D converter can be operated in the range of linearity, expanded the dynamic of A-D converter accordingly, thereby make dynamically being improved of digital receiver, antijamming capability can improve more than the 25dB at least, has guaranteed the operate as normal of digital receiver in the stronger environment of interference signal.Simultaneously because the effect of digital filter, the antijamming capability of this digital receiver, especially anti-near-end interference performance is higher than general narrow-band digital receiver.
By the specific embodiments of the invention described above as can be seen, the present invention is by the switching of different IF bandwidth filter, make wideband digital receiver possess the strong advantage of narrow-band receiver antijamming capability, thereby can strengthen the antijamming capability of digital receiver, and can expand reception dynamically, thereby can enlarge the application scenarios of wideband digital receiver, it also can normally be used in interference ratio more serious frequency range or area, and be applied in CDMA (Code Division Multiple Access as the present invention, code division multiple access inserts), WCDMA (Wideband Code Division Multiple Access, Wideband Code Division Multiple Access (WCDMA) inserts) etc. in the base station of system the time, the kind of base station receiver can be reduced, thereby network construction cost can be saved.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (5)
1, a kind of digital receiver comprises the Wideband Intermediate Frequency band pass filter, it is characterized in that, also comprises:
The narrowband intermediate frequency band pass filter;
Under the normal condition, place a road of described Wideband Intermediate Frequency band pass filter to carry out Filtering Processing the multi-carrier signal that receives; When interference signal is blocked the receive path of digital receiver, the multi-carrier signal that receives is switched to the narrowband intermediate frequency band pass filter carry out Filtering Processing.
2, digital receiver according to claim 1 is characterized in that, also comprises:
First switching device shifter and second switching device shifter;
Described first switching device shifter is arranged on the Wideband Intermediate Frequency band pass filter of digital receiver and the input of narrowband intermediate frequency band pass filter; Described second switching device shifter is arranged on the output of Wideband Intermediate Frequency band pass filter and narrowband intermediate frequency band pass filter.
3, digital receiver according to claim 2 is characterized in that, described first switching device shifter and second switching device shifter comprise:
Electronic switch.
4, according to claim 1,2 or 3 described digital receivers, it is characterized in that, also comprise:
Radio frequency band filter, low noise amplifier and frequency mixer;
After digital receiver is received multi-carrier signal from air interface, after handling by radio frequency band filter, low noise amplifier, frequency mixer successively, send Wideband Intermediate Frequency band pass filter or narrowband intermediate frequency band pass filter to.
5, digital receiver according to claim 4 is characterized in that, also comprises:
Intermediate frequency amplifier, band pass filter, analog to digital converter, digital demodulator and at least one digital filter;
Signal after process Wideband Intermediate Frequency band pass filter or narrowband intermediate frequency band pass filter are handled, sending intermediate frequency amplifier, band pass filter and analog to digital converter successively to handles, obtain digital signal, give successively then that digital demodulator carries out demodulation, digital filter carries out Filtering Processing, obtain baseband signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100031541A CN100505561C (en) | 2006-02-20 | 2006-02-20 | Digital receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100031541A CN100505561C (en) | 2006-02-20 | 2006-02-20 | Digital receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1862975A true CN1862975A (en) | 2006-11-15 |
| CN100505561C CN100505561C (en) | 2009-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100031541A Active CN100505561C (en) | 2006-02-20 | 2006-02-20 | Digital receiver |
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| CN (1) | CN100505561C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101119121B (en) * | 2007-08-21 | 2010-08-25 | 华为技术有限公司 | Anti-interference method in receiver, anti-interference receiver and anti-interference device |
| CN101795251B (en) * | 2010-01-20 | 2012-11-21 | 华为技术有限公司 | Device and method for generation feedback signal |
| CN103916158A (en) * | 2013-01-04 | 2014-07-09 | 联发科技股份有限公司 | Method Of Dynamically Selecting Filtering Paths And Communication Apparatus |
| CN104035077A (en) * | 2014-06-16 | 2014-09-10 | 西安天和防务技术股份有限公司 | Large dynamic continuous wave radar receiver |
| CN104617966A (en) * | 2014-12-31 | 2015-05-13 | 杭州敦崇科技股份有限公司 | WLAN (wireless local area network) adjacent channel interference resisting device and method thereof |
| CN111049553A (en) * | 2019-12-11 | 2020-04-21 | 易兆微电子（杭州）有限公司 | Low-power-consumption verification method for IEC14443 non-contact card |
| CN113794482A (en) * | 2021-07-29 | 2021-12-14 | 三维通信股份有限公司 | Electrically tunable bandpass filter, radio frequency receiving link and communication system |
-
2006
- 2006-02-20 CN CNB2006100031541A patent/CN100505561C/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101119121B (en) * | 2007-08-21 | 2010-08-25 | 华为技术有限公司 | Anti-interference method in receiver, anti-interference receiver and anti-interference device |
| CN101795251B (en) * | 2010-01-20 | 2012-11-21 | 华为技术有限公司 | Device and method for generation feedback signal |
| CN103916158A (en) * | 2013-01-04 | 2014-07-09 | 联发科技股份有限公司 | Method Of Dynamically Selecting Filtering Paths And Communication Apparatus |
| CN103916158B (en) * | 2013-01-04 | 2016-04-27 | 联发科技股份有限公司 | The method of Dynamic Selection filter paths and communication equipment |
| CN104035077A (en) * | 2014-06-16 | 2014-09-10 | 西安天和防务技术股份有限公司 | Large dynamic continuous wave radar receiver |
| CN104617966A (en) * | 2014-12-31 | 2015-05-13 | 杭州敦崇科技股份有限公司 | WLAN (wireless local area network) adjacent channel interference resisting device and method thereof |
| CN111049553A (en) * | 2019-12-11 | 2020-04-21 | 易兆微电子（杭州）有限公司 | Low-power-consumption verification method for IEC14443 non-contact card |
| CN113794482A (en) * | 2021-07-29 | 2021-12-14 | 三维通信股份有限公司 | Electrically tunable bandpass filter, radio frequency receiving link and communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100505561C (en) | 2009-06-24 |
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