CN1129236C - Method and device for decreasing intrinsic noise of radio receiver - Google Patents
Method and device for decreasing intrinsic noise of radio receiver Download PDFInfo
- Publication number
- CN1129236C CN1129236C CN 00125287 CN00125287A CN1129236C CN 1129236 C CN1129236 C CN 1129236C CN 00125287 CN00125287 CN 00125287 CN 00125287 A CN00125287 A CN 00125287A CN 1129236 C CN1129236 C CN 1129236C
- Authority
- CN
- China
- Prior art keywords
- signal
- processor
- noise
- converter
- intrinsic noise
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The present invention relates to a method and a device thereof for reducing the intrinsic noise of a radio receiver. The intrinsic noise of a receiver is measured and recorded by adjusting the arrangement of local oscillation. The intrinsic noise is eliminated in the operation of the receiver so as to reduce the noise of the receiver and the improve the performance of the receiver.
Description
The present invention relates to a kind of method and device thereof that reduces intrinsic noise of radio receiver.
The General Principle block diagram of existing wireless receiver as shown in Figure 1.Wireless signal is received by antenna and through front-end circuit processor 101, becomes rf modulated signal 108.Rf modulated signal 108 converts baseband signal 109 to through the frequency down-converts of low-converter 102.Low-converter 102 is subjected to the control of local oscillation circuit 103.The output of local oscillation circuit 103 is sine waves 112 of a standard, and its frequency has determined low-converter that the rf modulated signal 108 of which type of frequency is downconverted into baseband signal 109.The output 112 of local oscillation circuit 103 is by 113 controls of a local oscillator controller.The output frequency of control signal 115 control local oscillation circuits 103.Baseband signal 109 is amplified through filter 104 filtering, amplifier 105 and is become the signal 110 that can supply A-D converter 106 to handle.A-D converter 106 is transformed into digital signal corresponding 111 with signal 110, and digital signal 111 sending processors 107 are handled.Processor 107 is realized functions such as demodulation, decoding, equilibrium.
The objective of the invention is in order to overcome the shortcoming of existing wireless receiver, and a kind of method and apparatus that reduces intrinsic noise of radio receiver that proposes, this method and apparatus can be eliminated the intrinsic noise in the receiver, thereby reduces the noise of receiver, improves the performance of receiver.The technical scheme that realizes the object of the invention is: a kind of method that reduces intrinsic noise of radio receiver, be characterized in, and may further comprise the steps:
A, wireless signal are received by antenna and through the front-end circuit processor processing, become rf modulated signal, through frequency down-converts, convert baseband signal to;
B, baseband signal through filtering with amplification after A-D converter becomes digital signal corresponding with this signal transformation, and digital signal delivered to subtracter and noise extraction device respectively;
C, processor are with the operating state of certain periodic Control local oscillator controller, make the local oscillation circuit losing lock, by low-converter and filter normal digital signal is isolated out again, measure in the digital signal by wireless receiver introduce intrinsic noise, and this noise outputed in the memory store;
In the time of d, operation of receiver, processor carries out demodulation, decoding and equilibrium treatment to digital signal, and reads the intrinsic noise value from memory, deducts this intrinsic noise then in subtracter, forms the less signal of band noise.
Above-mentioned a kind of method that reduces intrinsic noise of radio receiver, wherein: described certain cycle is meant the cycle that receiver resets.
Above-mentioned a kind of method that reduces intrinsic noise of radio receiver, wherein: described certain cycle is meant other a kind of cycle when receiver is idle.
A kind of device that reduces intrinsic noise of radio receiver comprises: front-end circuit processor, low-converter, local oscillation circuit, local oscillator controller, filter, amplifier, A-D converter, processor; Wireless signal is received by antenna and through the front-end circuit processor processing, becomes rf modulated signal, and the frequency down-converts through low-converter converts baseband signal to; Low-converter is subjected to the control of local oscillation circuit; Baseband signal becomes the signal that can supply A-D converter to handle through filter device and amplifier, and A-D converter becomes digital signal corresponding with this signal transformation, and the digital signal sending processor is handled; Be characterized in: described processor is one or more; Also comprise a noise extraction device, a memory and a subtracter, digital signal from A-D converter output, deliver to subtracter and noise extraction device respectively, output to memory from the noise extraction device, output to subtracter from memory again, the signal of subtracter output outputs to the local oscillator controller from processor again to processor, the operating state of control local oscillation circuit.
Above-mentioned a kind of device that reduces intrinsic noise of radio receiver, wherein, described noise extraction device, memory and subtracter can be located at processor inside.
Above-mentioned a kind of device that reduces intrinsic noise of radio receiver, wherein, described processor is one.
Above-mentioned a kind of device that reduces intrinsic noise of radio receiver, wherein, described processor is a plurality of.
Because the present invention has adopted above technical scheme, by normal receiver signal is cut off,, and store elimination again with its intrinsic noise of certain period measurement, therefore the intrinsic noise in the receiver can be removed, thereby the quality of received signal is improved.
Concrete characteristic performance of the present invention is further provided by following embodiment and accompanying drawing thereof.
Fig. 1 is the electric theory diagram of prior art wireless receiver.
Fig. 2 is the electric theory diagram of apparatus of the present invention.
A kind of method that reduces intrinsic noise of radio receiver of the present invention, at first when wireless receiver is idle with its intrinsic noise of certain period measurement, and in memory the storage above-mentioned intrinsic noise value; In the time of operation of receiver, within described certain cycle, read above-mentioned intrinsic noise value, from receiver signal, remove this intrinsic noise value again from described memory.May further comprise the steps:
A, wireless signal are received by antenna and through the front-end circuit processor processing, become rf modulated signal, through frequency down-converts, convert baseband signal to;
B, baseband signal through filtering with amplification after A-D converter becomes digital signal corresponding with this signal transformation, and digital signal delivered to subtracter and noise extraction device respectively;
C, processor are with the operating state of certain periodic Control local oscillator controller, make the local oscillation circuit losing lock, by low-converter and filter normal digital signal is isolated out again, measure in the digital signal by wireless receiver introduce intrinsic noise, and this noise outputed in the memory store;
In the time of d, operation of receiver, processor carries out demodulation, decoding and equilibrium treatment to digital signal, and reads the intrinsic noise value from memory, deducts this intrinsic noise then in subtracter, forms the less signal of band noise.
Described certain cycle is meant the cycle that receiver resets.It also can be other a kind of cycle when receiver is idle.
Fig. 2 is the electric theory diagram of apparatus of the present invention.The device that the present invention reduces intrinsic noise of radio receiver comprises: front-end circuit processor 101, a low-converter 102, a local oscillation circuit 103,104, one amplifiers 105 of 113, one filters of a local oscillator controller, an A-D converter 106,201, one memories 202 of 107, one noise extraction devices of one or more processors and a subtracter 203.Noise extraction device 201, memory 202, subtracter 203 can be positioned at the inside of processor 107, also can be independent of processor 107 and exist.
Wireless signal is received by antenna and handles through front-end circuit processor 101, becomes rf modulated signal 108, through the frequency down-converts of low-converter 102, converts baseband signal 109 to; Low-converter 102 is subjected to the control of local oscillation circuit 103; Baseband signal 109 becomes the signal 110 that can supply A-D converter 106 to handle through filter 104 and amplifier 105, A-D converter 106 becomes digital signal corresponding 111 with this signal transformation, and digital signal 111 delivered to subtracter 203 and noise extraction device 201 respectively, output to memory 202 from noise extraction device 201, output to subtracter 203 from memory 202 again, the signal of subtracter output is to processor 107, output to local oscillator controller 113 from processor 107 again, the operating state of control local oscillation circuit 103.
In the time of the receiver operate as normal, include wireless signal in the signal 111 and receive and low-converter 102 down-frequency conversion normal receiver signal and above-mentioned intrinsic noise signal afterwards by antenna and front-end circuit 101.To measure above-mentioned intrinsic noise effectively, need above-mentioned normal receiver signal is got rid of.The present invention measures above-mentioned intrinsic noise by processor 107, thereby eliminates this intrinsic noise in signal 111.
As can be seen from Figure 2, low-converter 102 be normal receiver signal must be through the path.If under certain situation, cut off low-converter 102, then cut off above-mentioned normal receiver signal.Low-converter 102 is subjected to the control of local oscillation circuit 103, and the output 112 of local oscillation circuit 103 is by 113 controls of local oscillator controller.If processor 107 control local oscillator controllers 113 make local oscillation circuit 103 be in the state of losing lock, then the output 112 of local oscillation circuit 103 will be the far sine wave of the normal output area of frequency departure.The signal 112 control low-converters 102 of local oscillator output, low-converter 102 down-convert to the radiofrequency signal of normal range (NR) and depart from the far signal of normal baseband signal.The above-mentioned filter 104 that departs from the far signal of normal baseband signal through the back is attenuated to very for a short time, then thinks to be excluded.
After getting rid of normal receiver signal, signal 111 is just represented this inherent noise in receiver.This signal delivers to that the noise extraction device is further discerned, processing such as average, forms noise signal.This noise signal is delivered in the memory 202 and is stored.
In the time of wireless receiver work, signal 111 deducts the noise of memory 202 storages in subtracter 203, forms the less signal 205 of band noise.When processor 107 carries out demodulation, decoding, equilibrium treatment to signal 205 again, can improve the performance of receiver.
In a single day wireless receiver works together, and generally is continuous, eliminates the operate as normal that noise could not interrupt and stop wireless receiver.Therefore in wireless receiver work, can not at random cut off normal receiver signal by the method that makes local oscillation circuit 103 losing locks.The present invention allows processor 107 measure above-mentioned intrinsic noise with certain cycle when wireless receiver is idle, and stores above-mentioned intrinsic noise value in memory 202.In the time of operation of receiver, read the intrinsic noise value, from receiver signal, remove this intrinsic noise value, can reach the purpose of improving receiver performance from memory.
In one embodiment of the invention, above-mentioned some cycles is the cycle that receiver resets.When receiver resetted, receiver was not worked, and can measure above-mentioned intrinsic noise by processor 107 control local oscillation circuits 103 losing locks.According to the present invention, above-mentioned certain cycle also can be other a kind of cycle, as long as when receiver idle the time, just can carry out the measurement of above-mentioned intrinsic noise and does not influence the operate as normal of receiver.
Circuit structure of the present invention is simple, in the time of the intrinsic noise of measuring circuit, cuts off normal working signal, again with the intrinsic noise of certain period measurement circuit, and stores, and can not influence the operate as normal of receiver.
The present invention is used for wireless receiver, also can be used for the place that other need eliminate intrinsic noise.
Claims (7)
1, a kind of method that reduces intrinsic noise of radio receiver is characterized in that, may further comprise the steps:
A, wireless signal are received by antenna and through the front-end circuit processor processing, become rf modulated signal, through frequency down-converts, convert baseband signal to;
B, baseband signal through filtering with amplification after A-D converter becomes digital signal corresponding with this signal transformation, and digital signal delivered to subtracter and noise extraction device respectively;
C, processor are with the operating state of certain periodic Control local oscillator controller, make the local oscillation circuit losing lock, by low-converter and filter normal digital signal is isolated out again, measure in the digital signal by wireless receiver introduce intrinsic noise, and this noise outputed in the memory store;
In the time of d, operation of receiver, processor carries out demodulation, decoding and equilibrium treatment to digital signal, and reads the intrinsic noise value from memory, deducts this intrinsic noise then in subtracter, forms the less signal of band noise.
2, a kind of method that reduces intrinsic noise of radio receiver according to claim 1, it is characterized in that: described certain cycle is meant the cycle that receiver resets.
3, a kind of method that reduces intrinsic noise of radio receiver according to claim 1 is characterized in that: described certain cycle is meant other a kind of cycle when receiver is idle.
4, a kind of device that reduces intrinsic noise of radio receiver comprises: front-end circuit processor, low-converter, local oscillation circuit, local oscillator controller, filter, amplifier, A-D converter, processor; Wireless signal is received by antenna and through the front-end circuit processor processing, becomes rf modulated signal, and the frequency down-converts through low-converter converts baseband signal to; Low-converter is subjected to the control of local oscillation circuit; Baseband signal becomes the signal that can supply A-D converter to handle through filter device and amplifier, and A-D converter becomes digital signal corresponding with this signal transformation, and the digital signal sending processor is handled; It is characterized in that: described processor is one or more; Also comprise a noise extraction device, a memory and a subtracter, digital signal from A-D converter output, deliver to subtracter and noise extraction device respectively, output to memory from the noise extraction device, output to subtracter from memory again, the signal of subtracter output outputs to the local oscillator controller from processor again to processor, the operating state of control local oscillation circuit.
5, a kind of device that reduces intrinsic noise of radio receiver according to claim 4 is characterized in that, described noise extraction device, memory and subtracter can be located at processor inside.
6, a kind of device that reduces intrinsic noise of radio receiver according to claim 4 is characterized in that, described processor is one.
7, a kind of device that reduces intrinsic noise of radio receiver according to claim 4 is characterized in that, described processor is a plurality of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00125287 CN1129236C (en) | 2000-09-19 | 2000-09-19 | Method and device for decreasing intrinsic noise of radio receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00125287 CN1129236C (en) | 2000-09-19 | 2000-09-19 | Method and device for decreasing intrinsic noise of radio receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1344068A CN1344068A (en) | 2002-04-10 |
| CN1129236C true CN1129236C (en) | 2003-11-26 |
Family
ID=4591079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00125287 Expired - Fee Related CN1129236C (en) | 2000-09-19 | 2000-09-19 | Method and device for decreasing intrinsic noise of radio receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1129236C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150004917A1 (en) * | 2013-07-01 | 2015-01-01 | Trw Automotive U.S. Llc | Low level, low frequency signal measurement |
| CN105445549B (en) * | 2015-12-11 | 2019-09-06 | 中国电子科技集团公司第四十一研究所 | A kind of weak electromagnetic signal frequency spectrum measuring method |
| CN106908172B (en) | 2017-02-27 | 2019-05-21 | 深圳华远微电科技有限公司 | The signal processing method and system of wireless temperature measurement system |
-
2000
- 2000-09-19 CN CN 00125287 patent/CN1129236C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1344068A (en) | 2002-04-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8843094B2 (en) | Method and system for blocker detecton and automatic gain control | |
| CN102136845B (en) | Signal receiving method of active antenna and signal receiver | |
| CN214371183U (en) | Radio frequency power supply impedance matching system and unfreezing refrigerator | |
| CN204044354U (en) | High receiving sensitivity broadband receiver | |
| CN1959421A (en) | Standing wave detection circuit | |
| CN1129236C (en) | Method and device for decreasing intrinsic noise of radio receiver | |
| CN1197339A (en) | Mobile radio wave receiver with adaptive automatic gain control | |
| KR20030067687A (en) | A radio receiver | |
| CN112098748A (en) | Method for detecting partial discharge of switch cabinet of power distribution network by ultrahigh frequency sensor | |
| CN1543086A (en) | Radio communication terminal and radio signal receiving method | |
| CN103731220A (en) | Radio detection receiving system and method based on ARM technique | |
| CN203722645U (en) | Radio monitoring receiving system based on ARM technology | |
| CN103400092B (en) | A kind of SAW reader receiver structure based on amplitude coding and method of work thereof | |
| CN1304216A (en) | GPS receiver with search frequency band switchover function and terminal equipment | |
| CN103675765B (en) | High-frequency software radio receiving system | |
| KR20220052821A (en) | Signal processing circuit and position detection device | |
| CN101060346B (en) | A device and method for improving the dynamic range of receiver | |
| CN112686357B (en) | Ultrahigh frequency RFID tag and anti-electromagnetic interference module thereof | |
| CN114785903B (en) | Receiver-based pipelined panoramic scanning method and equipment | |
| JP3155718B2 (en) | Data receiving device | |
| CN112751588B (en) | Three-frequency fast tracking frequency hopping device and method for medium-wave transmitter | |
| CN102064842A (en) | Method and device for frequency sweep | |
| CN215340296U (en) | Anti-interference random signal generator and radar system | |
| KR20150026389A (en) | Long lead rfid tag for monitoring of fermented state and method for operating thereof | |
| CN108809361A (en) | A kind of wide bandwidth SAW reader reception device and its method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| 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: 20031126 Termination date: 20160919 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |