CN110190865B - A kind of reception system and method for Internet of Things narrow band signal - Google Patents
A kind of reception system and method for Internet of Things narrow band signal Download PDFInfo
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- H—ELECTRICITY
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Abstract
This application discloses a kind of reception systems of Internet of Things narrow band signal.Receiving antenna and radio-frequency devices are used to receive radiofrequency signal, and are configured by UE and receive frequency point；The reception frequency point of each subframe is both configured to the center frequency point of the frequency range of LTE bandwidth of cell.The radiofrequency signal that receiving antenna and radio-frequency devices receive is converted to baseband signal by down coversion by down conversion module.Baseband signal is converted to the digital signal of high sampling rate by analog-to-digital conversion module.Narrow band signal in the digital signal of high sampling rate is moved zero-frequency position by frequency translation module.The narrow band signal of zero-frequency position is reduced to low sampling rate signal from high sampling rate signal and filters out DC component by down-sampled module.Digital signal processing module carries out channel estimation, demodulation, decoding to the narrow band signal after down-sampled, obtains data information therein.The application passes through frequency translation and down-sampled the shortcomings that adversely affecting to evade narrowband switching and DC component bring, overcoming traditional narrow band signal reception mode.
Description
Technical field
This application involves a kind of receptions of narrow band signal for Internet of Things (Internet of Things, IoT) agreement
System and method.
Background technique
In eMTC(enhanced Machine Type Communication, enhance machine type communication), NB-IoT
In Internet of Things fidonetFidos such as (Narrow Band IoT, narrowband Internet of Things), eNB(eNodeB, base station) use one of LTE cell
Bandwidth is divided to give UE(User Equipment, user equipment) narrowband (Narrow Band) signal is sent, and there are continuous two
The scene of narrowband switching occurs between downlink subframe.
Referring to Fig. 1, this is the schematic diagram for the reception frequency point that existing Internet of Things narrow band signal receives system.Narrow band signal
N is the downlink signal that eNB is sent to UE in subframe n, and the bandwidth of narrow band signal n is a part of the LTE bandwidth of cell of subframe n.
Narrow band signal n+1 is the downlink signal that eNB is sent to UE in subframe n+1, and the bandwidth of narrow band signal n+1 is that the LTE of subframe n+1 is small
The wide a part of zone.It can be found that the position in different frequency domains narrow band signal n and narrow band signal n+1 (ordinate is different),
And switched in the boundary of subframe n and subframe n+1.Traditional UE is using the center frequency point of narrow band signal as each subframe
Reception frequency point, such reception mode has following two disadvantage.
Disadvantage one: when narrow band signal is when the boundary of continuous two downlink subframes switches, UE is also required to change it
Receive frequency point.Since the radio-frequency devices of UE need a period of time that can just be stabilized to normal operating conditions after switching frequency point, so
Downlink data can not be had correctly received by UE within a period of time after receiving frequency point and changing, this unstable period is located at
The initial position of narrow band signal n+1 in Fig. 1.This can reduce UE to the receptivity of narrow band signal n+1.
Disadvantage two: referring to Fig. 2, after the received narrow band signal of UE is down-converted to base band (zero-frequency) signal, in zero-frequency position
DC component can be introduced by setting.And subcarrier m, subcarrier n of the narrow band signal near zero-frequency position have part with DC component
It is overlapped, the data on the two subcarriers m and n can be interfered by DC component, therefore reduce UE to the acceptance of narrow band signal
Energy.
Summary of the invention
The technical problem to be solved by the application is to provide a kind of reception system of Internet of Things narrow band signal, can overcome on
State two disadvantages.For this purpose, the application also provides a kind of method of reseptance of Internet of Things narrow band signal.
In order to solve the above technical problems, this application provides a kind of reception system of Internet of Things narrow band signal, including receive
Antenna and radio-frequency devices, down conversion module, analog-to-digital conversion module, frequency translation module, down-sampled module and Digital Signal Processing
Module.The receiving antenna and radio-frequency devices are used to receive radiofrequency signal, and are configured by UE and receive frequency point；The reception of each subframe
Frequency point is both configured to the center frequency point of the frequency range of LTE bandwidth of cell.The down conversion module is by receiving antenna and radio frequency
The radiofrequency signal that device receives is converted to baseband signal by down coversion.The analog-to-digital conversion module is converted to baseband signal
The digital signal of high sampling rate.Narrow band signal in the digital signal of high sampling rate is moved zero-frequency by the frequency translation module
Position.The narrow band signal of zero-frequency position is reduced to low sampling rate signal from high sampling rate signal and filtered out by the down-sampled module
DC component.The digital signal processing module carries out channel estimation, demodulation, decoding to the narrow band signal after down-sampled, thus
Obtain the data information in narrow band signal.
The reception system of above-mentioned Internet of Things narrow band signal keeps the reception frequency point of each downlink subframe constant and and narrow band signal
Frequency range it is unrelated, by frequency translation and it is down-sampled come evade narrowband switching and DC component bring adversely affect, from
And overcome the shortcomings that traditional narrow band signal receives mode.
Further, the baseband signal of the down conversion module output introduces DC component in zero-frequency position, but narrowband is believed
The DC component of number all subcarriers and zero-frequency position is not overlapped.This is a kind of specific implementation side of down conversion module
Formula.
Further, in the zero-frequency position narrow band signal of the frequency translation module output, narrow band signal is distributed in zero-frequency
Position, and down conversion module introduce DC component after frequency translation far from zero-frequency position.This is frequency translation module
A kind of specific implementation.
Further, the sample frequency of the low sampling rate signal of the down-sampled module output is greater than or equal to zero-frequency position
Twice of narrow band signal highest frequency.Narrow band signal after down-sampled is conducive to Digital Signal Processing since sample frequency is lower
The realization of module.
Further, the frequency range that the down-sampled module would allow through be set as covering it is down-sampled after narrowband letter
Number bandwidth range (can be just covering or bigger), the frequency domain position as locating for DC component not allow by frequency
Within the scope of rate, therefore it can be filtered from receiving in signal.This is another specific implementation of down-sampled module.
Present invention also provides a kind of method of reseptances of Internet of Things narrow band signal, include the following steps: step S802: receiving
Radiofrequency signal, and configure reception frequency point；The reception frequency point of each subframe is both configured in the frequency range of LTE bandwidth of cell
Heart frequency point.Step S804: the radiofrequency signal received is converted into baseband signal by down coversion.Step S806: base band is believed
Number be converted to the digital signal of high sampling rate.Step S808: the narrow band signal in the digital signal of high sampling rate is moved to zero
Frequency position.Step S810: the narrow band signal of zero-frequency position is reduced to low sampling rate signal from high sampling rate signal and is filtered out straight
Flow component.Step S812: channel estimation, demodulation, decoding are carried out to the narrow band signal after down-sampled, to obtain in narrow band signal
Data information.
The method of reseptance of above-mentioned Internet of Things narrow band signal keeps the reception frequency point of each downlink subframe constant and and narrow band signal
Frequency range it is unrelated, by frequency translation and it is down-sampled come evade narrowband switching and DC component bring adversely affect, from
And overcome the shortcomings that traditional narrow band signal receives mode.
Further, in the step S804, the baseband signal can introduce DC component in zero-frequency position, but narrowband is believed
The DC component of number all subcarriers and zero-frequency position is not overlapped.This is a kind of specific implementation of step S804.
Further, in the step S808, in the zero-frequency position narrow band signal that is exported, narrow band signal is distributed in zero-frequency
Near position, and step S804 introduce DC component after frequency translation far from zero-frequency position.This is step S808
A kind of specific implementation.
Further, in the step S810, the sample frequency of the low sampling rate signal exported is greater than or equal to zero-frequency
Twice of position narrow band signal highest frequency.Narrow band signal after down-sampled is conducive to digital signal since sample frequency is lower
The realization of processing module.
Further, in the step S810, the DC component that filters out is that the frequency range that would allow through is set as
Cover it is down-sampled after narrow band signal bandwidth range (can be just covering or bigger), the frequency domain as locating for DC component
Position not allow by frequency range in, therefore can from receive signal in be filtered.This is the another kind of step S810
Specific implementation.
The technical effect that the application obtains be to maintain each downlink subframe reception frequency point is constant and frequency with narrow band signal
Range is unrelated, by frequency translation and it is down-sampled come evade narrowband switching and DC component bring adversely affect, to overcome
Traditional narrow band signal receives the shortcomings that mode.
Detailed description of the invention
Fig. 1 is the schematic diagram for the reception frequency point that existing Internet of Things narrow band signal receives system.
Fig. 2 is the DC component signal Chong Die with subcarrier that narrow band signal is down-converted to zero-frequency position after baseband signal
Figure.
Fig. 3 is that the Internet of Things narrow band signal of the application receives the structural schematic diagram of system.
Fig. 4 is the schematic diagram that the Internet of Things narrow band signal of the application receives the reception frequency point of system.
Fig. 5 is the schematic diagram of the baseband signal of down conversion module output.
Fig. 6 is the schematic diagram of the zero-frequency position narrow band signal of frequency translation module output.
Fig. 7 is the signal for filtering out the zero-frequency position narrow band signal after DC component of the low sampling rate of down-sampled module output
Figure.
Fig. 8 is the flow diagram of the Internet of Things narrow band signal method of reseptance of the application.
Description of symbols in figure: 10 receive system for Internet of Things narrow band signal；102 be receiving antenna and radio-frequency devices；
104 be down conversion module；106 be analog-to-digital conversion module；108 be frequency translation module；110 be down-sampled module；112 be number
Signal processing module.
Specific embodiment
Referring to Fig. 3, this is the reception system provided by the present application for Internet of Things narrow band signal.The system 10 includes
Receiving antenna and radio-frequency devices 102, down conversion module 104, analog-to-digital conversion module 106, frequency translation module 108, down-sampled mould
Block 110 and digital signal processing module 112.
The receiving antenna and radio-frequency devices 102 of the UE is used to receive radiofrequency signal, and is configured by UE and receive frequency point.Each
The reception frequency point of subframe is both configured to the center frequency point of the frequency range of LTE bandwidth of cell, and with the narrowband in each subframe
The frequency range of signal is unrelated.
UE is passed through lower change in the radiofrequency signal that receiving antenna and radio-frequency devices 102 receive by the down conversion module 104
Frequency is converted to zero-frequency (base band) signal.
Baseband signal is converted to the digital signal of high sampling rate by the analog-to-digital conversion module 106.Due to narrow band signal phase
Farther out to zero-frequency position, therefore digital-to-analogue conversion needs to use higher sample rate to guarantee that narrow band signal is completely converted into number
Word signal.
Narrow band signal in the digital signal of high sampling rate is moved zero-frequency position by the frequency translation module 108.
The narrow band signal of zero-frequency position is reduced to low sampling rate signal simultaneously from high sampling rate signal by the down-sampled module 110
DC component is filtered out, the sample frequency after reduction is generally equivalent to or slightly larger than the two of zero-frequency position narrow band signal highest frequency
Times, to meet Nyquist-Shannon's sampling theorem (Nyquist-Shannon sampling theorem).It is narrow after down-sampled
Band signal is conducive to the realization of digital signal processing module 112 since sample rate is lower.
The digital signal processing module 112 carries out channel estimation, demodulation, decoding etc. to the narrow band signal after down-sampled
Reason, to obtain the data information in narrow band signal.
Referring to Fig. 4, this is the schematic diagram that the receiving antenna and the configuration of radio-frequency devices 102 receive frequency point.UE is in subframe n
Reception frequency point n be configured as the center frequency point of LTE cell, and receive the signal of entire LTE bandwidth of cell range, eNB is sent
Narrow band signal n to UE is a part of LTE bandwidth of cell.It is small that UE in the reception frequency point n+1 of subframe n+1 is still configured as LTE
The center frequency point in area, and the signal of entire LTE bandwidth of cell range is received, the narrow band signal n+1 that eNB is sent to UE is LTE small
The wide a part of zone.Because UE is LTE center of housing estate frequency point in the reception frequency point of subframe n and subframe n+1, there is no becoming
Change, so radio-frequency devices do not need switching and receive frequency point and can be always maintained at normal operating conditions.Therefore the signal of subframe n+1 can
To be correctly received completely by UE, the receptivity of UE will not influence, to solve the disadvantage that conventional receiver mode one.
Referring to Fig. 5, this is the schematic diagram for the baseband signal that the down conversion module 104 exports.The baseband signal exists
Zero-frequency position can introduce DC component, but the DC component of all subcarrier and zero-frequency position of narrow band signal is not overlapped,
Therefore DC component will not generate interference to narrow band signal, therefore will not reduce the receptivity of UE, connect to solve tradition
The shortcomings that debit's formula two.
Referring to Fig. 6, this is the schematic diagram for the zero-frequency position narrow band signal that the frequency translation module 108 exports.It can be with
It was found that narrow band signal is distributed near zero-frequency position, and the DC component that down conversion module 104 introduces after frequency translation
Far from zero-frequency position.
Referring to Fig. 7, this is the zero-frequency position of the low sampling rate that the down-sampled module 110 exports filtered out after DC component
Set the schematic diagram of narrow band signal.The DC component that filters out is, for example, that the frequency range that would allow through is set as covering drop just
The bandwidth range of narrow band signal after low sampling rate is bigger, the frequency domain position as locating for DC component not allow by
In frequency range, therefore it can be filtered from receiving in signal.
Referring to Fig. 8, this is the method for reseptance provided by the present application for Internet of Things narrow band signal comprising following step
Suddenly.
Step S802: radiofrequency signal being received, and configures reception frequency point --- the reception frequency point of each subframe is both configured to
The center frequency point of the frequency range of LTE bandwidth of cell.This step for example by Fig. 3 receiving antenna and radio-frequency devices 102 execute.
Step S804: the radiofrequency signal received is converted into zero-frequency (base band) signal by down coversion.The base band letter
Number DC component can be introduced in zero-frequency position, but the DC component of all subcarrier and zero-frequency position of narrow band signal is without weight
It is folded, therefore DC component will not generate interference to narrow band signal, therefore will not reduce the receptivity of UE.This step is for example by scheming
Down conversion module 104 in 3 executes.
Step S806: baseband signal is converted to the digital signal of high sampling rate.This step is for example turned by the modulus in Fig. 3
Block 106 is changed the mold to execute.
Step S808: the narrow band signal in the digital signal of high sampling rate is moved into zero-frequency position.The zero-frequency exported
In the narrow band signal of position, narrow band signal is distributed near zero-frequency position, and the DC component that step S804 is introduced is removed through overfrequency
Far from zero-frequency position after shifting.Therefore all subcarriers of narrow band signal near zero-frequency position and the direct current far from zero-frequency position
Component is not overlapped.This step is for example executed by the frequency translation module 108 in Fig. 3.
Step S810: the narrow band signal of zero-frequency position is reduced to low sampling rate signal from high sampling rate signal and is filtered out straight
Flow component.Allow by frequency range be set as just cover reduce sample rate after narrow band signal bandwidth range or summary
Greatly, the frequency domain position as locating for DC component not allow by frequency range in, can from receive signal in by mistake
It filters.This step is for example executed by the down-sampled module 110 in Fig. 3.
Step S812: the processing such as channel estimation, demodulation, decoding is carried out to the narrow band signal after down-sampled, to obtain narrow
Data information in band signal.This step is for example executed by the digital signal processing module 112 in Fig. 3.
The reception system and method for Internet of Things narrow band signal provided by the present application keeps the reception frequency point of each downlink subframe not
Become and unrelated with the frequency range of narrow band signal, narrowband switching and direct current point are evaded by frequency translation and down-sampled method
Bring adverse effect is measured, to overcome the shortcomings that traditional narrow band signal receives mode.
The above is only preferred embodiment of the present application, it is not used to limit the application.Come for those skilled in the art
It says, various changes and changes are possible in this application.Within the spirit and principles of this application, made any modification, equivalent
Replacement, improvement etc., should be included within the scope of protection of this application.
Claims (10)
1. a kind of reception system of Internet of Things narrow band signal, characterized in that including receiving antenna and radio-frequency devices, down coversion mould
Block, analog-to-digital conversion module, frequency translation module, down-sampled module and digital signal processing module；
The receiving antenna and radio-frequency devices are used to receive radiofrequency signal, and are configured by UE and receive frequency point；The reception of each subframe
Frequency point is both configured to the center frequency point of the frequency range of LTE bandwidth of cell；
The radiofrequency signal that receiving antenna and radio-frequency devices receive is converted to base band letter by down coversion by the down conversion module
Number；
Baseband signal is converted to the digital signal of high sampling rate by the analog-to-digital conversion module；
Narrow band signal in the digital signal of high sampling rate is moved zero-frequency position by the frequency translation module；
The narrow band signal of zero-frequency position is reduced to low sampling rate signal from high sampling rate signal and filtered out by the down-sampled module
DC component；
The digital signal processing module carries out channel estimation, demodulation, decoding to the narrow band signal after down-sampled, to obtain narrow
Data information in band signal.
2. the reception system of Internet of Things narrow band signal according to claim 1, characterized in that the down conversion module output
Baseband signal introduce DC component in zero-frequency position, but the DC component of all subcarrier and zero-frequency position of narrow band signal is equal
It is not overlapped.
3. the reception system of Internet of Things narrow band signal according to claim 1, characterized in that the frequency translation module is defeated
In zero-frequency position narrow band signal out, narrow band signal is distributed in zero-frequency position, and the DC component that down conversion module introduces is passed through
Far from zero-frequency position after frequency translation.
4. the reception system of Internet of Things narrow band signal according to claim 1, characterized in that the down-sampled module output
The sample frequency of low sampling rate signal be greater than or equal to twice of zero-frequency position narrow band signal highest frequency.
5. the reception system of Internet of Things narrow band signal according to claim 1, characterized in that the down-sampled module will permit
Perhaps the frequency range passed through be set as covering it is down-sampled after narrow band signal bandwidth range, DC component not allow by
It is therefore filtered in frequency range.
6. a kind of method of reseptance of Internet of Things narrow band signal, characterized in that include the following steps:
Step S802: radiofrequency signal is received, and configures reception frequency point；The reception frequency point of each subframe is both configured to LTE cell
The center frequency point of the frequency range of bandwidth；
Step S804: the radiofrequency signal received is converted into baseband signal by down coversion；
Step S806: baseband signal is converted to the digital signal of high sampling rate；
Step S808: the narrow band signal in the digital signal of high sampling rate is moved into zero-frequency position；
Step S810: being reduced to low sampling rate signal from high sampling rate signal for the narrow band signal of zero-frequency position and filters out direct current point
Amount；
Step S812: channel estimation, demodulation, decoding are carried out to the narrow band signal after down-sampled, to obtain in narrow band signal
Data information.
7. the method for reseptance of Internet of Things narrow band signal according to claim 6, characterized in that in the step S804, institute
DC component can be introduced in zero-frequency position by stating baseband signal, but the DC component of all subcarrier and zero-frequency position of narrow band signal
It is not overlapped.
8. the method for reseptance of Internet of Things narrow band signal according to claim 7, characterized in that in the step S808, institute
In the zero-frequency position narrow band signal of output, narrow band signal is distributed near zero-frequency position, and the DC component that step S804 is introduced
Far from zero-frequency position after frequency translation.
9. the method for reseptance of Internet of Things narrow band signal according to claim 6, characterized in that in the step S810, institute
The sample frequency of the low sampling rate signal of output is greater than or equal to twice of zero-frequency position narrow band signal highest frequency.
10. the method for reseptance of Internet of Things narrow band signal according to claim 6, characterized in that in the step S810, institute
State filtering DC component be the frequency range that would allow through be set as covering it is down-sampled after narrow band signal bandwidth range, directly
Flow component not allow by frequency range in therefore be filtered.
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| CN111245457B (en) * | 2020-04-26 | 2020-09-11 | 杭州城芯科技有限公司 | Receiver direct current processing method compatible with wide and narrow band signals |
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| JP4337913B2 (en) * | 2007-06-04 | 2009-09-30 | ソニー株式会社 | Receiving apparatus, program, and receiving method |
| CN101834824B (en) * | 2010-03-22 | 2012-08-08 | 深圳市云海通讯股份有限公司 | Multicarrier filtration method, multicarrier filtration system and repeater |
| WO2014043600A1 (en) * | 2012-09-17 | 2014-03-20 | Hughes Network Systems, Llc | Method and apparatus for providing an enhanced zero-if receiver architecture for a wireless communications system |
| US9893749B2 (en) * | 2015-01-26 | 2018-02-13 | Apple Inc. | Receiver architecture with analog complex filter for OFDMA reception |
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| US5604746A (en) * | 1994-03-09 | 1997-02-18 | Kabushiki Kaisha Toshiba | Digital data receiver |
| CN101379743A (en) * | 2006-01-18 | 2009-03-04 | 株式会社Ntt都科摩 | Base station, mobile station, and communication method |
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Address after: 201203 Floor 9, building 10, No. 399, Keyuan Road, China (Shanghai) free trade pilot zone, Pudong New Area, Shanghai Patentee after: Aojie Technology Co., Ltd Address before: 201203 No. 399, Keyuan Road, Zhangjiang High-tech Park, Pudong New Area, Shanghai Patentee before: Aojie Technology Co., Ltd |
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