CN110417700A - A kind of SSB block serial number recognition methods applied to 5GNR system - Google Patents
A kind of SSB block serial number recognition methods applied to 5GNR system Download PDFInfo
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- CN110417700A CN110417700A CN201910623342.1A CN201910623342A CN110417700A CN 110417700 A CN110417700 A CN 110417700A CN 201910623342 A CN201910623342 A CN 201910623342A CN 110417700 A CN110417700 A CN 110417700A
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- pbch
- dmrs
- serial number
- ssb block
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L27/2607—Cyclic extensions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2657—Carrier synchronisation
Abstract
A kind of SSB block serial number recognition methods applied to 5GNR system.Reception base band 5GNR signal is downsampled to 3.84MHz sample rate first by this method, complete main synchronization and auxiliary synchronous identification, it extracts broadcast channel PBCH symbol and carries out offset estimation and correction, then demodulated reference signal DMRS is extracted, 8 kinds of local PBCH DMRS signals are generated according to physical-layer cell identifier PCI, receiving, PBCH DMRS is related to local PBCH DMRS, and the position of maximum value is SSB block serial number.The present invention completes SSB block using PBCH DMRS correlation and identifies.Without carrying out the channel estimation and equilibrium of PBCH, computational complexity is greatly reduced, by emulating and testing, this method can complete SSB block identification under poor channel environments of eating dishes without rice or wine.
Description
Technical field
The present invention relates to 5GNR downlink signals to identify field, more particularly to a kind of SSB block serial number recognition methods.
Background technique
5G, i.e. the 5th third-generation mobile communication technology are the extensions after 4G, are the strength catalyst for leading all things on earth to interconnect, 5G
With completely new mobile communication system framework, provide the peak rate, Millisecond that at least decuple 4G propagation delay time and hundred billion grades
Concatenation ability.
SSB block includes 4 OFDM symbols, and signal kinds include primary synchronization signal PSS, secondary synchronization signal SSS, broadcast
Channel PBCH and its demodulated reference signal DMRS, each SSB block have a unique serial number, send at the time of different
Different SSB wave beams is 0 to 7 for frequency range Sub3G to Sub6G value range.
Currently, China 5G comes into pre- commercial stage, 5G network experiment, 5G base station down letter are carried out in more ground city extensively
Number demodulation analysis becomes particularly important.The correct identification of SSB block serial number is that subsequent wave beam identification and system information are extracted
Premise, but it is still not applied to the SSB block serial number recognition methods of 5GNR system at present.
Summary of the invention
It is an object of the present invention to provide a kind of SSB block serial number recognition methods applied to 5GNR system.
Technical solution of the present invention
A kind of SSB block serial number recognition methods applied to 5GNR system, method includes the following steps:
Step 1, reception base band 5GNR signal are downsampled to 3.84MHz sample rate；
Step 2 completes main synchronization and auxiliary synchronous identification in 3.84MHz sample rate；
2.1st step generates the 3 seed type primary synchronization signals that FFT points in local are 128；
2.2nd step, reception signal are related to 3 kinds of local primary synchronization signals, obtain maximum value N2；
2.3rd step generates corresponding 336 seed type secondary synchronization signal according to main wheel synchronization type；
2.4th step, reception signal are related to 336 kinds of local secondary synchronization signals, obtain maximum value N1；
2.5th step calculates physical-layer cell identifier PCI=(N2-1)+3* (N1-1).
Step 3 extracts PBCH symbol progress offset estimation and correction；
3.1st step extracts 3 PBCH symbols；
CP2 is replicated in 3.2nd step, the cyclic prefix CP 1 for extracting each PBCH symbol respectively and tail portion；
3.3rd step, CP1 and CP2 conjugate multiplication seek argument, obtain offset estimation value fre_off；
3.4th step, the mean value for seeking three PBCH symbol offset estimation values, obtain fre_off_avg；
3.5th step, the frequency deviation that three PBCH symbols are compensated using fre_off_avg.
Step 4 extracts demodulated reference signal DMRS；
4.1st step, the initial position that by physical-layer cell identifier PCI 4 modulus are determined with DMRS；
4.2nd step, every 4 symbol extractions, one DMRS subcarrier；
Step 5 generates 8 kinds of local PBCH DMRS signals according to physical-layer cell identifier PCI；
5.1st step generates 8 kinds of scramble initial values according to the value range of i_ssb；
5.2nd step generates 8 kinds of PBCH DMRS sequences according to 8 kinds of scramble initial values.
Step 6, receiving, PBCH DMRS is related to local PBCH DMRS, obtains 8 correlations, calculates peak-to-average force ratio
Ratio can determine that the position of maximum value is SSB block serial number if ratio is greater than 5；
6.1st step removes remaining 7 correlation other than maximum related value, seeks its mean value mean_7；
6.2nd step, with maximum related value divided by mean value mean_7, obtain equal peak ratio ratio.
The advantages and positive effects of the present invention:
The present invention completes SSB block using PBCH DMRS correlation and identifies.Without carry out PBCH channel estimation and
Weighing apparatus, greatly reduces computational complexity, by emulating and testing, this method can complete SSB under poor channel environments of eating dishes without rice or wine
Block identification.
Detailed description of the invention
Fig. 1 is the flow chart of SSB block of the present invention identification.
Fig. 2 is examples measure summary view.
Fig. 3 is the auxiliary synchronous correlated results figure of embodiment.
Fig. 4 is embodiment PBCH DMRS correlated results figure.
Specific embodiment
Embodiment 1
A kind of SSB block serial number recognition methods applied to 5GNR system, the process of this method are as shown in Figure 1.This reality
It applies example and acquires 5G interference signal, centre frequency 3.54982GHz, 5G signal bandwidth 100MHz, SS- in Beijing General Bureau of Radio, Film and Television
RSRP is about -100dBm, and channel circumstance is severe, and PBCH planisphere is unobvious, as shown in Figure 2.
Specific recognition methods the following steps are included:
Step (1) receives base band 5GNR signal and is downsampled to 3.84MHz sample rate；
Step (2) completes main synchronization and auxiliary synchronous identification in 3.84MHz sample rate；It comprises the steps of:
(2.1) the 3 seed type primary synchronization signals that FFT points in local are 128 are generated；
(2.2) it is related to 3 kinds of local primary synchronization signals to receive signal, obtains maximum value N2, the present embodiment N2 is 3；
(2.3) corresponding 336 seed type secondary synchronization signal is generated according to main wheel synchronization type；
(2.4) it is related to 336 kinds of local secondary synchronization signals to receive signal, obtains maximum value N1, the present embodiment N1 is 10；
(2.5) calculating physical-layer cell identifier PCI=(N2-1)+3* (N1-1), the present embodiment 29, as shown in Figure 3.
Step (3) extracts PBCH symbol and carries out offset estimation and correction；It comprises the steps of:
(3.1) 3 PBCH symbols are extracted；
(3.2) cyclic prefix CP 1 and its tail portion for extracting PBCH symbol replicate CP2；
(3.3) CP1 and CP2 conjugate multiplication seek argument, obtain offset estimation value fre_off, three fre_off of the present embodiment
Respectively -0.0666, -0.0471, -0.0163；
(3.4) mean value for seeking three PBCH symbol offset estimation values, obtains fre_off_avg, and the present embodiment is-
0.0433；
(3.5) frequency deviation of three PBCH symbols is compensated using fre_off_avg.
Step (4) extracts demodulated reference signal DMRS；It comprises the steps of:
(4.1) by PCI 4 modulus are determined with the initial position of DMRS；
(4.2) every 4 symbol extractions, one DMRS subcarrier.
Step (5) generates 8 kinds of local PBCH DMRS signals according to PCI；It comprises the steps of:
(5.1) 8 kinds of scramble initial values are generated according to the value range of i_ssb；
(5.2) 8 kinds of PBCH DMRS sequences are generated according to 8 kinds of scramble initial values.
Step (6) is related to local PBCH DMRS PBCH DMRS is received, and obtains 8 correlations, calculates peak-to-average force ratio
Ratio, the present embodiment ratio are 5.3, are greater than 5, determine that the position of maximum value is SSB block serial number, the position of maximum value
It is 0, as SSB block serial number, as shown in Figure 4.
Claims (6)
1. a kind of SSB block serial number recognition methods applied to 5GNR system, it is characterised in that the following steps are included:
Step 1, reception base band 5GNR signal are downsampled to 3.84MHz sample rate；
Step 2 completes main synchronization and auxiliary synchronous identification in 3.84MHz sample rate；
Step 3 extracts PBCH symbol progress offset estimation and correction；
Step 4 extracts demodulated reference signal DMRS；
Step 5 generates 8 kinds of local PBCH DMRS signals according to physical-layer cell identifier PCI；
Step 6, receiving, PBCH DMRS is related to local PBCH DMRS, obtains 8 correlations, calculates peak-to-average force ratio ratio, if
Ratio is greater than 5, can determine that the position of maximum value is SSB block serial number.
2. a kind of SSB block serial number recognition methods applied to 5GNR system according to claim 1, feature exist
In the main synchronization of completion described in step 2 and auxiliary synchronous identification comprise the steps of:
2.1st step generates the 3 seed type primary synchronization signals that FFT points in local are 128；
2.2nd step, reception signal are related to 3 kinds of local primary synchronization signals, obtain maximum value N2；
2.3rd step generates corresponding 336 seed type secondary synchronization signal according to main wheel synchronization type；
2.4th step, reception signal are related to 336 kinds of local secondary synchronization signals, obtain maximum value N1；
2.5th step calculates physical-layer cell identifier PCI=(N2-1)+3* (N1-1).
3. a kind of SSB block serial number recognition methods applied to 5GNR system according to claim 1, feature exist
In offset estimation described in step 3 and correction comprise the steps of:
3.1st step extracts 3 PBCH symbols；
CP2 is replicated in 3.2nd step, the cyclic prefix CP 1 for extracting each PBCH symbol respectively and tail portion；
3.3rd step, CP1 and CP2 conjugate multiplication seek argument, obtain offset estimation value fre_off；
3.4th step, the mean value for seeking three PBCH symbol offset estimation values, obtain fre_off_avg；
3.5th step, the frequency deviation that three PBCH symbols are compensated using fre_off_avg.
4. a kind of SSB block serial number recognition methods applied to 5GNR system according to claim 1, feature exist
In extraction demodulated reference signal DMRS described in step 4 is comprised the steps of:
4.1st step, the initial position that by physical-layer cell identifier PCI 4 modulus are determined with DMRS；
4.2nd step, every 4 symbol extractions, one DMRS subcarrier.
5. a kind of SSB block serial number recognition methods applied to 5GNR system according to claim 1, feature exist
In generation local PBCH DMRS signal described in step 5 comprises the steps of:
5.1st step generates 8 kinds of scramble initial values according to the value range of i_ssb；
5.2nd step generates 8 kinds of PBCH DMRS sequences according to 8 kinds of scramble initial values.
6. a kind of SSB block serial number recognition methods applied to 5GNR system according to claim 1, feature exist
In calculating peak-to-average force ratio described in step 6 comprises the steps of:
6.1st step removes remaining 7 correlation other than maximum related value, seeks its mean value mean_7；
6.2nd step, with maximum related value divided by mean value mean_7, obtain equal peak ratio ratio.
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| CN110830408A (en) * | 2019-11-13 | 2020-02-21 | 天津德力仪器设备有限公司 | Method for rapidly capturing CAS in EMBMS system |
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| CN112422459A (en) * | 2020-11-12 | 2021-02-26 | 苏州华兴源创科技股份有限公司 | Channel demodulation method, device, channel demodulation equipment and storage medium |
| CN112565145A (en) * | 2020-11-20 | 2021-03-26 | 中电科仪器仪表(安徽)有限公司 | 5G millimeter wave signal demodulation method |
| CN114205198A (en) * | 2021-11-26 | 2022-03-18 | 中电科思仪科技(安徽)有限公司 | High-precision real-time demodulation method based on 5G NR |
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Cited By (8)
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|---|---|---|---|---|
| CN110830408A (en) * | 2019-11-13 | 2020-02-21 | 天津德力仪器设备有限公司 | Method for rapidly capturing CAS in EMBMS system |
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| CN111953627B (en) * | 2020-08-11 | 2022-11-11 | Oppo广东移动通信有限公司 | Method and device for detecting SSB serial number |
| CN112422459A (en) * | 2020-11-12 | 2021-02-26 | 苏州华兴源创科技股份有限公司 | Channel demodulation method, device, channel demodulation equipment and storage medium |
| CN112565145A (en) * | 2020-11-20 | 2021-03-26 | 中电科仪器仪表(安徽)有限公司 | 5G millimeter wave signal demodulation method |
| CN112565145B (en) * | 2020-11-20 | 2023-09-01 | 中电科思仪科技(安徽)有限公司 | 5G millimeter wave signal demodulation method |
| CN114205198A (en) * | 2021-11-26 | 2022-03-18 | 中电科思仪科技(安徽)有限公司 | High-precision real-time demodulation method based on 5G NR |
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Application publication date: 20191105 |