CN109474984A - Primary synchronization signal detection method and device, user terminal and readable storage medium storing program for executing - Google Patents
Primary synchronization signal detection method and device, user terminal and readable storage medium storing program for executing Download PDFInfo
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- CN109474984A CN109474984A CN201710801243.9A CN201710801243A CN109474984A CN 109474984 A CN109474984 A CN 109474984A CN 201710801243 A CN201710801243 A CN 201710801243A CN 109474984 A CN109474984 A CN 109474984A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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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
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2657—Carrier synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
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Abstract
A kind of primary synchronization signal detection method and device, user terminal and readable storage medium storing program for executing, the detection method include: the selected part PSS sequence from local full bandwidth PSS sequence；According to bandwidth, subcarrier spacing and the oversample factor of the part PSS sequence, the sample rate for receiving signal is determined；According to the bandwidth of the part PSS sequence, subcarrier spacing and the sample rate for receiving signal, local time domain PSS signal is generated；Low-pass filtering is carried out to the reception signal, and according to the sample rate for receiving signal, down-sampling is carried out to the reception signal after low-pass filtering；According to the reception signal after the local time domain PSS signal and down-sampling, obtains timing information and organize interior cell identity information.Above scheme can reduce the complexity and power consumption of initial p SS detection.
Description
Technical field
The present invention relates to wireless communication field more particularly to a kind of primary synchronization signal detection method and device, user terminal
And readable storage medium storing program for executing.
Background technique
In LTE system, the bandwidth of primary synchronization signal (Primary Synchronization Signal, PSS) is 63
A subcarrier occupies 6 Physical Resource Block (Physical Resource Block, PRB), subcarrier spacing 15kHz, uses
In initial p SS detection default cycles be 5ms.In PSS detection process, in order to reduce data volume to be treated, letter is received
It number first can process Jing Guo a low-pass filtering and down-sampling.
It newly eats dishes without rice or wine in (New Radio, NR) system in 5G, the bandwidth of PSS is 127 subcarriers, occupies 12 PRB, is used
In initial p SS detection default cycles be 20ms.According to frequency range difference, the subcarrier spacing of PSS is possible there are 4 kinds:
15kHz, 30kHz, 120kHz and 240kHz.In PSS detection process, in order to reduce data volume to be treated, signal is received
It equally first can process Jing Guo a low-pass filtering and down-sampling.
In 5G NR system and LTE system, bandwidth, subcarrier spacing and the initial default period of PSS is all different, PSS
Low-pass filtering and down-sampling demand in detection process be not also identical.Compared to LTE system, in 5G NR system, according to difference
Sample rate, the bandwidth of PSS increased separately 2 times, 4 times, 16 times and 32 times, and the default cycles for initial p SS detection increase
4 times.To sum up, the data volume of initial p SS detection has increased separately 8 times, 16 times, 64 times and 128 times.
It can be seen that in the prior art, the data volume of the single initial p SS detection in 5G NR system dramatically increases, initially
The complexity and power consumption of PSS detection will dramatically increase.
Summary of the invention
What the embodiment of the present invention solved is how to reduce the complexity and power consumption of initial p SS detection.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of primary synchronization signal detection method, comprising: from local
In full bandwidth PSS sequence, selected part PSS sequence；It is adopted according to the bandwidth of the part PSS sequence, subcarrier spacing and mistake
Like factor determines the sample rate for receiving signal；According to the bandwidth of the part PSS sequence, subcarrier spacing and the reception
The sample rate of signal generates local time domain PSS signal；Low-pass filtering is carried out to the reception signal, and is believed according to the reception
Number sample rate, to after low-pass filtering reception signal carry out down-sampling；According to the local time domain PSS signal and down-sampling
Reception signal afterwards obtains timing information and organizes interior cell identity information.
Optionally, described from local full bandwidth PSS sequence, selected part PSS sequence, comprising: from the full band in the local
In wide PSS sequence, using the frequency domain center of the local full bandwidth PSS sequence as midpoint, the part PSS sequence is chosen.
Optionally, described using the frequency domain center of the local full bandwidth PSS sequence as midpoint, choose the part band
Wide PSS sequence, comprising: using the frequency domain center of the local full bandwidth PSS sequence as midpoint, in the two sides at the midpoint
It is symmetrical to choose PSS sequence, as selected part PSS sequence；The selected part PSS sequence includes that integer height carries
Wave.
Optionally, it is described to the reception signal carry out low-pass filtering, comprising: according to it is described receive signal sample rate,
The bandwidth of the part PSS sequence and the subcarrier spacing, determine the type of low-pass filter；According to identified low pass
The type of filter generates corresponding low-pass filter, and low to reception signal progress by low-pass filter generated
Pass filter.
Optionally, the reception signal to after low-pass filtering carries out down-sampling, comprising: receives adopting for signal according to described
The sample rate of sample rate and ADC determines down-sampling order；According to the down-sampling order, to the reception after the low-pass filtering
Signal carries out down-sampling.
Optionally, it is described according to it is described receive signal sample rate and ADC sample rate, determine down-sampling order, wrap
Include: by the sample rate of the ADC divided by the sample rate for receiving signal, obtained quotient is as the down-sampling order.
Optionally, the reception signal according to after the local time domain PSS signal and down-sampling, obtains timing information
With cell identity information in group, comprising: carry out time domain with the local time domain PSS signal to the reception signal after the down-sampling
Cross-correlation calculation；The result obtained to cross-correlation calculation carries out computing module-square, and with the reception signal after the down-sampling
Operation is normalized in mould square；Multiple antennas merging is carried out to normalization operation result, and carries out the cumulative of multiple search lengths；
Peak value searching and threshold test are carried out to accumulation result；According to the peak value detected, obtains the timing information and organize interior cell
Identification information.
Optionally, the primary synchronization signal detection method further include: according to the local time domain PSS signal, it is described under adopt
Reception signal and preset multiple frequency deviation trial values after sample determine offset estimation value from the multiple frequency deviation trial value.
Optionally, described that offset estimation value is determined from the multiple frequency deviation trial value, comprising: to obtain the multiple frequency deviation
Trial is worth corresponding peak value, chooses the maximum frequency deviation trial value of peak value as the offset estimation value.
Optionally, in obtaining timing information and organizing after cell identity information, further includes: according to the local full bandwidth
PSS sequence calibrates cell identity information in the timing information and described group.
Optionally, described according to the local full bandwidth PSS sequence, to cell mark in the timing information and described group
Know information to be calibrated, comprising: the point centered on the corresponding moment point of the timing information chooses preset duration section；It adopts
With the local full bandwidth PSS sequence, PSS inspection is carried out to the reception signal after the down-sampling in the preset duration section
It surveys, to be calibrated to cell identity information in the timing information and described group.
Optionally, the local time domain PSS signal of the generation, comprising: mended respectively in the right and left of the part PSS sequence
The 0 of same number, so that the length for mending the part PSS sequence after 0 is equal to the sample rate for receiving signal and the subcarrier
The quotient at interval；Part PSS sequence after mending 0 is converted into local time domain PSS signal.
The embodiment of the invention also provides a kind of primary synchronization signal detection devices, comprising: selection unit is used for from local complete
In bandwidth PSS sequence, selected part PSS sequence；Determination unit, for according between the bandwidth of the part PSS sequence, subcarrier
Every and oversample factor, determine receive signal sample rate；Generation unit, for according to the bandwidth of the part PSS sequence,
Subcarrier spacing and the sample rate for receiving signal, generate local time domain PSS signal；Low-pass filter unit, for institute
It states and receives signal progress low-pass filtering；Downsampling unit, for carrying out down-sampling to the reception signal after low-pass filtering；It obtains single
Member, for cell mark according to the reception signal after the local time domain PSS signal and down-sampling, obtaining timing information and organize
Know information.
Optionally, the selection unit is used for from the local full bandwidth PSS sequence, with the local full bandwidth PSS
The frequency domain center of sequence is midpoint, chooses the part PSS sequence.
Optionally, the selection unit, for using the frequency domain center of the local full bandwidth PSS sequence as midpoint,
PSS sequence is symmetrically chosen in the two sides at the midpoint, as selected part PSS sequence；The selected part PSS sequence
Column include integer number of subcarriers.
Optionally, the low-pass filter unit, for according to sample rate, the part PSS sequence for receiving signal
Bandwidth and the subcarrier spacing, determine the type of low-pass filter；It is raw according to the type of identified low-pass filter
Low-pass filtering is carried out to the reception signal at corresponding low-pass filter, and by low-pass filter generated.
Optionally, the downsampling unit, for the sample rate according to the sample rate for receiving signal and ADC, really
Fix sampling order；According to the down-sampling order, down-sampling is carried out to the reception signal after the low-pass filtering.
Optionally, the downsampling unit, for by the sample rate of the ADC divided by it is described receive signal sample rate,
Obtained quotient is as the down-sampling order.
Optionally, the acquiring unit, for the reception signal and the local time domain PSS signal after the down-sampling
Carry out time domain cross-correlation calculation；The result obtained to cross-correlation calculation carries out computing module-square, and with connecing after the down-sampling
Operation is normalized in the mould square of the collection of letters number；Multiple antennas merging is carried out to normalization operation result, and carries out multiple search length
Degree adds up；Peak value searching and threshold test are carried out to accumulation result；According to the peak value detected, obtain the timing information and
Cell identity information in group.
Optionally, the primary synchronization signal detection device further include: offset estimation value determination unit, for according to described
Reception signal and preset multiple frequency deviation trial values after ground time domain PSS signal, the down-sampling, taste from the multiple frequency deviation
Offset estimation value is determined in examination value.
Optionally, the offset estimation value determination unit is selected for obtaining the corresponding peak value of the multiple frequency deviation trial value
Take the maximum frequency deviation trial value of peak value as the offset estimation value.
Optionally, the primary synchronization signal detection device further include: correction unit, for according to the local full bandwidth
PSS sequence calibrates cell identity information in the timing information and described group.
Optionally, the correction unit is chosen preset for the point centered on the corresponding moment point of the timing information
Duration section；Using the local full bandwidth PSS sequence, to the reception signal after the down-sampling in the preset duration section
PSS detection is carried out, to calibrate to cell identity information in the timing information and described group.
Optionally, the generation unit, for mending the 0 of same number respectively in the right and left of the part PSS sequence,
So that the length for mending the part PSS sequence after 0 is equal to the quotient of the sample rate for receiving signal and the subcarrier spacing；It will mend
Part PSS sequence after 0 is converted into local time domain PSS signal.
The embodiment of the invention also provides a kind of computer readable storage mediums, are stored thereon with computer instruction, described
The step of primary synchronization signal detection method described in executing any of the above-described kind when computer instruction operation.
The embodiment of the invention also provides a kind of user terminal, including memory and processor, stored on the memory
Have a computer instruction, the computer instruction execute any of the above-described kind when running described in primary synchronization signal detection method step
Suddenly.
Compared with prior art, the technical solution of the embodiment of the present invention has the advantages that
When carrying out primary synchronization signal detection, the selected section PSS sequence from local full bandwidth PSS sequence, according to selected
The part PSS sequence taken generates local time domain PSS signal.After local time domain PSS signal generated and down-sampling
Signal is received, timing information is obtained and organizes interior cell identity information, to complete primary synchronization signal detection.Due to being using portion
Divide PSS sequence to generate local time domain PSS signal, rather than use the local local time domain PSS signal of full bandwidth PSS sequence generation,
Therefore the computation complexity of primary synchronization signal detection can be effectively reduced.
Further, local time domain PSS signal is first generated according to part PSS sequence, is believed according to local time domain PSS generated
Number and down-sampling after reception signal acquisition timing information and organize in cell identity information.Later, pass through local full bandwidth PSS
Sequence calibrates cell identity information in acquired timing information and group, thus reducing primary synchronization signal detection
While, guarantee the precision of primary synchronization signal detection.
Detailed description of the invention
Fig. 1 is the flow chart of one of embodiment of the present invention primary synchronization signal detection method；
Fig. 2 is the structural schematic diagram of one of embodiment of the present invention primary synchronization signal detection device.
Specific embodiment
LTE in the prior art is given referring to table 1 according to the bandwidth of PSS, subcarrier spacing and initial default period
The demand of PSS is detected in system and 5G NR system sample rate and number of samples.
Table 1
Seen from table 1, compared to LTE system, in 5G NR system, according to different sample rates, the bandwidth of PSS is distinguished
2 times, 4 times, 16 times and 32 times are increased, the default cycles for initial p SS detection increase 4 times.To sum up, initial p SS is detected
Data volume increased separately 8 times, 16 times, 64 times and 128 times.It can be seen that the data volume of single initial p SS detection significantly increases
Add.Correspondingly, in 5G NR system, the complexity and power consumption of initial p SS detection will be dramatically increased.
In embodiments of the present invention, when carrying out primary synchronization signal detection, the selected section from local full bandwidth PSS sequence
PSS sequence generates local time domain PSS signal according to selected part PSS sequence.Due to being generated using part PSS sequence
Local time domain PSS signal, rather than use local full bandwidth PSS sequence to generate local time domain PSS signal, therefore can effectively drop
The computation complexity of low primary synchronization signal detection.
It is understandable to enable above-mentioned purpose of the invention, feature and beneficial effect to become apparent, with reference to the accompanying drawing to this
The specific embodiment of invention is described in detail.
The embodiment of the invention provides a kind of primary synchronization signal detection methods, referring to Fig.1, carry out below by way of specific steps
It is described in detail.
Step S101, from local full bandwidth PSS sequence, selected part PSS sequence.
In specific implementation, local full bandwidth PSS sequence can be pre-stored full bandwidth PSS sequence.Local full band
The number of wide PSS sequence can be 3, or 2 or 1.
It in specific implementation, can local full bandwidth in the selected part PSS sequence from local full bandwidth PSS sequence
The frequency domain center of PSS sequence is that selected part PSS sequence is carried out at midpoint.It in embodiments of the present invention, can be in local full band
PSS sequence is symmetrically chosen in the center frequency position two sides of wide PSS sequence, as selected PSS sequence.
In embodiments of the present invention, the bandwidth of selected part PSS sequence may include integer Physical Resource Block
(Physical Resource Block, PRB), also may include non-integer PRB.It should be noted that selected part
The bandwidth of PSS sequence may include integer number of subcarriers.
For example, the bandwidth of local full bandwidth PSS sequence is 12 PRB, the bandwidth of selected part PSS sequence is 6
PRB.6 PRB are continuous 6 PRB, and the center frequency point of 6 PRB is identical as the center frequency point of local full bandwidth PSS sequence.
For another example, the bandwidth of local full bandwidth PSS sequence is 12 PRB, and the bandwidth of selected part PSS sequence is 4
PRB.4 PRB are continuous 4 PRB, and the center frequency point of 4 PRB is identical as the center frequency point of local full bandwidth PSS sequence.
For another example, the bandwidth of local full bandwidth PSS sequence is 12 PRB, and the bandwidth of selected part PSS sequence is 2.5
A PRB.It in 5G NR system, defines a PRB and occupies 12 subcarriers on frequency domain, therefore, 2.5 PRB occupy 30 sons
Carrier wave, 30 subcarriers continuous and corresponding center frequency point on frequency domain are identical as the center frequency point of local full bandwidth PSS sequence.
It is understood that in other embodiments of the present invention, in the selected part PSS from local full bandwidth PSS sequence
When sequence, selected part PSS sequence can also be carried out from the other positions in local full bandwidth PSS sequence, as long as selected by meeting
Part PSS sequence bandwidth occupancy integer number of subcarriers.
In addition, the bandwidth of selected part PSS sequence can also be selected according to actual application scenarios, for example,
The bandwidth of selected part PSS sequence is 6 PRB or 4 PRB.
Step S102 is determined and is received according to bandwidth, subcarrier spacing and the oversample factor of the part PSS sequence
The sample rate of signal.
In specific implementation, for 5G NR system, subcarrier spacing can for 15KHz, 30KHz, 120KHz or
240KHz.Oversample factor can be set according to specific application scenarios, for example, setting oversample factor as 2.
Step S103, according to the bandwidth of the part PSS sequence, subcarrier spacing and the sampling for receiving signal
Rate generates local time domain PSS signal.
In specific implementation, can the bandwidth of part PSS sequence, step S102 according to selected by step S101 determined
Reception signal sample rate and subcarrier spacing, to generate local time domain PSS signal.
Compared with prior art, local time domain PSS signal generated of the embodiment of the present invention is raw according to part PSS sequence
At, rather than local full bandwidth PSS sequence is used to generate.
It in specific implementation, can be first by the right and left of part PSS sequence point when generating local time domain PSS signal
Not Bu Chong same number 0 so that completing the length of part PSS sequence after mending 0 reaches following value: receiving the sample rate of signal
With the quotient of subcarrier spacing.Later, the part PSS sequence after mending 0 is converted into local time domain PSS signal.
For example, the length of part PSS sequence is 72 subcarriers, the sample rate for receiving signal is 1.92MS/s, subcarrier
Between be divided into 15KHz, then first by length be 72 part PSS sequence mend 0 to length be 128, then again by length be 128 part
PSS sequence is converted into local time domain PSS signal.
When the part PSS sequence for being 72 to length carries out mending 0, in the left side supplement for the part PSS sequence that length is 72
28 0,28 0 are equally supplemented on right side.
Step S104 carries out low-pass filtering to the reception signal.
In specific implementation, receiver first can carry out low-pass filtering to reception signal after receiving reception signal
Processing.
It in embodiments of the present invention, can be according to sample rate, the bandwidth and subcarrier of part PSS sequence for receiving signal
Interval, to determine the type of low-pass filter.After the type of low-pass filter has been determined, receiver can be generated right therewith
The low-pass filter answered, and low-pass filtering treatment is carried out to signal is received using low-pass filter generated.
Step S105 carries out down-sampling to the reception signal after low-pass filtering according to the sample rate for receiving signal.
In specific implementation, receiver can be according to the sample rate for receiving signal, to by after low-pass filtering treatment
It receives signal and carries out down-sampling.When the reception signal after handling low-pass filter carries out down-sampling, the order of down-sampling
It can be according to the sample rate of analog-digital converter (Analog-to-Digital Converter, ADC) and the sampling of reception signal
Rate determines.
In practical applications it is found that when carrying out signal reception, reception signal received by receiver is to simulate letter
Existing for number format.Receiver is after receiving the reception signal of analog signal format, by ADC to analog signal format
It receives signal and carries out analog-to-digital conversion, so that the reception that the reception signal of analog signal format is converted into digital signals format be believed
Number.
In specific implementation, the order of down-sampling can be with are as follows: the sample rate of ADC and receive signal sample rate quotient.Example
Such as, the sample rate of ADC is 122.88MS/s, and the sample rate for receiving signal is 7.68MS/s, then the order of down-sampling are as follows:
122.88/7.68=16.
After determining the down-sampling order for receiving signal, can to by the reception signal after low-pass filtering treatment into
The processing of row down-sampling.
In specific implementation, it is patrolled between step S101~step S103 and step S104~step S105 there is no stringent
Sequencing on volume, can first carry out step S101~step S103, can also first carry out step S104~step S105, or
Person is performed simultaneously step S104~step S105 and step S101~step S103.
Step S106, according to the reception signal after the local time domain PSS signal and down-sampling, obtain timing information with
Cell identity information in group.
It in specific implementation, can be right after getting the reception signal after local time domain PSS signal and down-sampling
Reception signal after local time domain PSS signal and down-sampling carries out time domain cross-correlation calculation, and time domain cross-correlation calculation can lead to
Frequency domain method is crossed to realize.
After cross correlation results are calculated, computing module-square can be carried out to cross correlation results, obtained mould is put down
Operation is normalized in the mould square of reception signal after square operation result and down-sampling.The normalization that normalization operation is obtained
As a result multiple antennas merging is carried out, and carries out the cumulative of multiple search lengths.Peak value searching and threshold value inspection are carried out to accumulation result
It surveys, according to the peak value detected, obtains timing informationAnd cell identity information in organizing
In the prior art, primary synchronization signal detection method is all based on local full bandwidth PSS sequence and carries out, and in this hair
In bright embodiment, then it is that selected part PSS sequence carries out from local full bandwidth PSS sequence, therefore, is mentioned in the embodiment of the present invention
The complexity of primary synchronization signal detection can be effectively reduced in the primary synchronization signal detection method of confession.
In specific implementation, it when executing step S106, can be combined with offset estimation, i.e., taste multiple preset frequency deviations
Examination value is loaded on the reception signal after local time domain PSS signal or down-sampling.It is attempted by obtaining multiple preset frequency deviations
Be worth the corresponding peak value detected, selected from multiple preset frequency deviation trial values one as offset estimation value.
In other words, when executing step S106, multiple preset frequency deviation trial values can also be loaded into local time domain
On reception signal after PSS signal or down-sampling, in getting timing information and organizing while cell identity information, obtain
Take offset estimation value.
In specific implementation, multiple frequency deviation trials can be obtained respectively and be worth the corresponding peak value detected, and select peak value
Maximum frequency deviation trial value is as offset estimation value.It is understood that in other embodiments of the present invention, it can also be used
His method is chosen offset estimation value from multiple frequency deviation trial values, is not repeated herein.
In specific implementation, using the primary synchronization signal detection method provided in the above embodiment of the present invention, although can be with
The complexity of primary synchronization signal detection is substantially reduced, but there may be acquired timing information and organize interior cell ID
The lower problem of precision of information.
While reducing primary synchronization signal detection complexity, still to be able to obtain the timing information and group of degree of precision
Interior cell identity information in embodiments of the present invention can also be according to local full bandwidth PSS sequence, to obtaining in step S106
To timing information with organize in cell identity information be corrected.
In specific implementation, after obtaining timing information by step S106, at the time of being corresponded to timing information
Point centered on point, chooses preset duration section.Using local full bandwidth PSS sequence, under in preset duration section
The reception signal of sampling carries out full bandwidth PSS detection, to calibrate to cell identity information in timing information and group.
In practical applications, the basic procedure of full bandwidth PSS detection may include steps of: receive signal by low pass
Filtering and down-sampling process, the reception signal after exporting down-sampling；It is complete according to the sample rate of the reception signal after down-sampling, local
Bandwidth PSS sequence generates local time domain PSS signal；When being carried out to the reception signal after local time domain PSS signal and down-sampling
Behaviour is normalized to the mould square and the mould square of the reception signal after down-sampling of cross-correlation calculation result in domain cross-correlation calculation
Make；The cumulative of multiple antennas merging and multiple search lengths is carried out to normalization result；To accumulation result carry out peak value searching and
Threshold test exports timing information and organizes interior cell identity information according to the peak value detected.
The primary synchronization signal provided in the basic procedure of above-mentioned full bandwidth PSS detection and the above embodiment of the present invention is detected
Method compares, and can know that the two part operation process is identical, main difference is: full bandwidth PSS detection process
In, the local time domain PSS signal of generation is generated using local full bandwidth PSS sequence；In the embodiment of the present invention, the local of generation
Time domain PSS signal is generated using selected part PSS sequence.
In specific implementation, if in step s 106, by frequency deviation trial value be loaded into local time domain PSS signal or under adopt
When on the reception signal after sample, when being corrected by full bandwidth PSS sequence to cell identity information in timing information and group,
Offset estimation value can also be corrected.
In specific implementation, preset duration section can not done superfluous herein according to actual application scenarios sets itself
It states.
It can be seen that first local time domain PSS signal is generated according to part PSS sequence, according to local time domain PSS generated
Cell identity information in reception signal acquisition timing information and group after signal and down-sampling.Later, pass through local full bandwidth
PSS sequence calibrates cell identity information in acquired timing information and group, thus reducing primary synchronization signal inspection
While survey, guarantee the precision of primary synchronization signal detection.
Referring to Fig. 2, the embodiment of the invention provides a kind of primary synchronization signal detection devices, comprising: selection unit 201, really
Order member 202, generation unit 203, low-pass filter unit 204, downsampling unit 205 and acquiring unit 206, in which:
Selection unit 201 is used for the selected part PSS sequence from local full bandwidth PSS sequence；
Determination unit 202, for bandwidth, subcarrier spacing and the oversample factor according to the part PSS sequence, really
Surely the sample rate of signal is received；
Generation unit 203, for according to the bandwidth of the part PSS sequence, subcarrier spacing and the reception signal
Sample rate, generate local time domain PSS signal；
Low-pass filter unit 204, for carrying out low-pass filtering to the reception signal；
Downsampling unit 205, for carrying out down-sampling to the reception signal after low-pass filtering；
Acquiring unit 206, for according to the reception signal after the local time domain PSS signal and down-sampling, it to be fixed to obtain
When information and organize in cell identity information.
In specific implementation, the selection unit 201 can be used for from the local full bandwidth PSS sequence, with described
The frequency domain center of local full bandwidth PSS sequence is midpoint, chooses the part PSS sequence.
In specific implementation, the selection unit 201 can be used in the frequency domain of the local full bandwidth PSS sequence
Heart position is midpoint, PSS sequence is symmetrically chosen in the two sides at the midpoint, as selected part PSS sequence；It is described selected
The part PSS sequence taken includes integer number of subcarriers.
In specific implementation, the low-pass filter unit 204, for according to the sample rate for receiving signal, the portion
The bandwidth of point PSS sequence and the subcarrier spacing, determine the type of low-pass filter；According to identified low-pass filter
Type, generate corresponding low-pass filter, and low-pass filtering is carried out to the reception signal by low-pass filter generated.
In specific implementation, the downsampling unit 205, can be used for according to it is described receive signal sample rate and
The sample rate of ADC determines down-sampling order；According to the down-sampling order, the reception signal after the low-pass filtering is carried out
Down-sampling.
In specific implementation, the downsampling unit 205, can be used for the sample rate of the ADC divided by the reception
The sample rate of signal, obtained quotient is as the down-sampling order.
In specific implementation, the acquiring unit 206, can be used for after the down-sampling reception signal with described
Ground time domain PSS signal carries out time domain cross-correlation calculation；The result obtained to cross-correlation calculation carries out computing module-square, and with it is described
Operation is normalized in the mould square of reception signal after down-sampling；Multiple antennas merging is carried out to normalization operation result, is gone forward side by side
The multiple search lengths of row add up；Peak value searching and threshold test are carried out to accumulation result；According to the peak value detected, institute is obtained
Cell identity information in stating timing information and organizing.
In specific implementation, the primary synchronization signal detection device can also include: offset estimation value determination unit (Fig. 2
In be not shown), for according to the reception signal and preset multiple frequencies after the local time domain PSS signal, the down-sampling
Inclined trial value, determines offset estimation value from the multiple frequency deviation trial value.
In specific implementation, the offset estimation value determination unit can be used for obtaining the multiple frequency deviation trial value pair
The peak value answered chooses the maximum frequency deviation trial value of peak value as the offset estimation value.
In specific implementation, the primary synchronization signal detection device can also include: correction unit (being not shown in Fig. 2),
For being calibrated to cell identity information in the timing information and described group according to the local full bandwidth PSS sequence.
In specific implementation, the correction unit can be used for the point centered on the corresponding moment point of the timing information,
Choose preset duration section；Using the local full bandwidth PSS sequence, after the down-sampling in the preset duration section
Reception signal carry out PSS detection, to be calibrated to cell identity information in the timing information and described group.
In specific implementation, the generation unit 203 can be used for distinguishing in the right and left of the part PSS sequence
The 0 of same number is mended, so that the length for mending the part PSS sequence after 0 is equal to the sample rate and the sub- load for receiving signal
The quotient of wave spacing；Part PSS sequence after mending 0 is converted into local time domain PSS signal.
The embodiment of the invention also provides a kind of computer readable storage mediums, are stored thereon with computer instruction, described
The step of primary synchronization signal detection method that any of the above-described embodiment of the present invention provides is executed when computer instruction is run, this
Place does not repeat them here.
The embodiment of the invention also provides a kind of user terminal, including memory and processor, stored on the memory
There is computer instruction, the primary synchronization signal that any of the above-described embodiment of the present invention provides is executed when the computer instruction is run
The step of detection method, is not repeated herein.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is can
It is completed with indicating relevant hardware by program, which can be stored in a computer readable storage medium, storage
Medium may include: ROM, RAM, disk or CD etc..
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (26)
1. a kind of primary synchronization signal detection method characterized by comprising
From local full bandwidth PSS sequence, selected part PSS sequence；
According to bandwidth, subcarrier spacing and the oversample factor of the part PSS sequence, the sample rate for receiving signal is determined；
According to the bandwidth of the part PSS sequence, subcarrier spacing and the sample rate for receiving signal, local time domain is generated
PSS signal；
Low-pass filtering is carried out to the reception signal, and according to the sample rate for receiving signal, to the reception after low-pass filtering
Signal carries out down-sampling；
According to the reception signal after the local time domain PSS signal and down-sampling, obtains timing information and organize interior cell ID
Information.
2. primary synchronization signal detection method as described in claim 1, which is characterized in that described from local full bandwidth PSS sequence
In, selected part PSS sequence, comprising:
From the local full bandwidth PSS sequence, using the frequency domain center of the local full bandwidth PSS sequence as midpoint, choosing
Take the part PSS sequence.
3. primary synchronization signal detection method as claimed in claim 2, which is characterized in that described with the local full bandwidth PSS
The frequency domain center of sequence is midpoint, chooses the PSS sequence of the fractional bandwidth, comprising:
Using the frequency domain center of the local full bandwidth PSS sequence as midpoint, PSS sequence is symmetrically chosen in the two sides at the midpoint
Column, as selected part PSS sequence；The selected part PSS sequence includes integer number of subcarriers.
4. primary synchronization signal detection method as described in claim 1, which is characterized in that described low to reception signal progress
Pass filter, comprising:
According to sample rate, the bandwidth of the part PSS sequence and the subcarrier spacing for receiving signal, low pass is determined
The type of filter；
According to the type of identified low-pass filter, corresponding low-pass filter is generated, and by low-pass filter generated
Low-pass filtering is carried out to the reception signal.
5. primary synchronization signal detection method as claimed in claim 4, which is characterized in that the reception to after low-pass filtering is believed
Number carry out down-sampling, comprising:
According to the sample rate for receiving signal and the sample rate of ADC, down-sampling order is determined；
According to the down-sampling order, down-sampling is carried out to the reception signal after the low-pass filtering.
6. primary synchronization signal detection method as claimed in claim 5, which is characterized in that described to receive adopting for signal according to described
The sample rate of sample rate and ADC determines down-sampling order, comprising:
By the sample rate of the ADC divided by the sample rate for receiving signal, obtained quotient is as the down-sampling order.
7. primary synchronization signal detection method as described in claim 1, which is characterized in that described according to the local time domain PSS
Reception signal after signal and down-sampling obtains timing information and organizes interior cell identity information, comprising:
Time domain cross-correlation calculation is carried out with the local time domain PSS signal to the reception signal after the down-sampling；To cross-correlation
The result being calculated carries out computing module-square, and fortune is normalized with the mould square of the reception signal after the down-sampling
It calculates；
Multiple antennas merging is carried out to normalization operation result, and carries out the cumulative of multiple search lengths；
Peak value searching and threshold test are carried out to accumulation result；
According to the peak value detected, obtains the timing information and organize interior cell identity information.
8. primary synchronization signal detection method as claimed in claim 7, which is characterized in that further include:
According to after the local time domain PSS signal, the down-sampling reception signal and preset multiple frequency deviation trial values, from
Offset estimation value is determined in the multiple frequency deviation trial value.
9. primary synchronization signal detection method as claimed in claim 8, which is characterized in that described from the multiple frequency deviation trial value
Middle determining offset estimation value, comprising:
The corresponding peak value of the multiple frequency deviation trial value is obtained, chooses the maximum frequency deviation trial value of peak value as the offset estimation
Value.
10. primary synchronization signal detection method as described in claim 1, which is characterized in that interior small with group obtaining timing information
After area's identification information, further includes:
According to the local full bandwidth PSS sequence, cell identity information in the timing information and described group is calibrated.
11. primary synchronization signal detection method as claimed in claim 10, which is characterized in that described according to the local full bandwidth
PSS sequence calibrates cell identity information in the timing information and described group, comprising:
The point centered on the corresponding moment point of the timing information chooses preset duration section；Using the local full bandwidth
PSS sequence carries out PSS detection to the reception signal after the down-sampling in the preset duration section, to believe the timing
Breath and described group in cell identity information calibrated.
12. primary synchronization signal detection method as described in claim 1, which is characterized in that the generation local time domain PSS letter
Number, comprising:
The 0 of same number is mended respectively in the right and left of the part PSS sequence, so that mending the length of the part PSS sequence after 0
Equal to the quotient of the sample rate for receiving signal and the subcarrier spacing；
Part PSS sequence after mending 0 is converted into local time domain PSS signal.
13. a kind of primary synchronization signal detection device characterized by comprising
Selection unit is used for the selected part PSS sequence from local full bandwidth PSS sequence；
Determination unit is determined and is received for bandwidth, subcarrier spacing and the oversample factor according to the part PSS sequence
The sample rate of signal；
Generation unit, for according to the bandwidth of the part PSS sequence, subcarrier spacing and the sampling for receiving signal
Rate generates local time domain PSS signal；
Low-pass filter unit, for carrying out low-pass filtering to the reception signal；
Downsampling unit, for carrying out down-sampling to the reception signal after low-pass filtering；
Acquiring unit, for according to the reception signal after the local time domain PSS signal and down-sampling, obtain timing information with
Cell identity information in group.
14. primary synchronization signal detection device as claimed in claim 13, which is characterized in that the selection unit is used for from institute
It states in local full bandwidth PSS sequence, using the frequency domain center of the local full bandwidth PSS sequence as midpoint, chooses the portion
Divide PSS sequence.
15. primary synchronization signal detection device as claimed in claim 14, which is characterized in that the selection unit, for institute
The frequency domain center for stating local full bandwidth PSS sequence is midpoint, symmetrically chooses PSS sequence in the two sides at the midpoint, as
Selected part PSS sequence；The selected part PSS sequence includes integer number of subcarriers.
16. primary synchronization signal detection device as claimed in claim 13, which is characterized in that the low-pass filter unit is used for
According to sample rate, the bandwidth of the part PSS sequence and the subcarrier spacing for receiving signal, low-pass filtering is determined
The type of device；According to the type of identified low-pass filter, corresponding low-pass filter is generated, and by low pass filtered generated
Wave device carries out low-pass filtering to the reception signal.
17. primary synchronization signal detection device as claimed in claim 16, which is characterized in that the downsampling unit is used for root
According to the sample rate for receiving signal and the sample rate of ADC, down-sampling order is determined；According to the down-sampling order, to institute
Reception signal after stating low-pass filtering carries out down-sampling.
18. primary synchronization signal detection device as claimed in claim 17, which is characterized in that the downsampling unit, being used for will
The sample rate of the ADC is divided by the sample rate for receiving signal, and obtained quotient is as the down-sampling order.
19. primary synchronization signal detection device as claimed in claim 13, which is characterized in that the acquiring unit, for institute
Reception signal and the local time domain PSS signal after stating down-sampling carry out time domain cross-correlation calculation；Cross-correlation calculation is obtained
Result carry out computing module-square, and operation is normalized with the mould square of the reception signal after the down-sampling；To normalizing
Change operation result and carry out multiple antennas merging, and carries out the cumulative of multiple search lengths；Peak value searching and threshold are carried out to accumulation result
Value detection；According to the peak value detected, obtains the timing information and organize interior cell identity information.
20. primary synchronization signal detection device as claimed in claim 19, which is characterized in that further include: offset estimation value determines
Unit, for according to after the local time domain PSS signal, the down-sampling reception signal and preset multiple frequency deviations attempt
Value determines offset estimation value from the multiple frequency deviation trial value.
21. primary synchronization signal detection device as claimed in claim 20, which is characterized in that the offset estimation value determines single
Member chooses the maximum frequency deviation trial value of peak value as the frequency deviation for obtaining the corresponding peak value of the multiple frequency deviation trial value
Estimated value.
22. primary synchronization signal detection device as claimed in claim 13, which is characterized in that further include: correction unit is used for root
According to the local full bandwidth PSS sequence, cell identity information in the timing information and described group is calibrated.
23. primary synchronization signal detection device as claimed in claim 22, which is characterized in that the correction unit, for institute
Point centered on the corresponding moment point of timing information is stated, preset duration section is chosen；Using the local full bandwidth PSS sequence,
PSS detection is carried out to the reception signal after the down-sampling in the preset duration section, to the timing information and institute
Cell identity information in group is stated to be calibrated.
24. primary synchronization signal detection device as claimed in claim 13, which is characterized in that the generation unit, in institute
The right and left for stating part PSS sequence mends the 0 of same number respectively, so that mending the length of the part PSS sequence after 0 equal to described
Receive the sample rate of signal and the quotient of the subcarrier spacing；Part PSS sequence after mending 0 is converted into local time domain PSS letter
Number.
25. a kind of computer readable storage medium, is stored thereon with computer instruction, which is characterized in that the computer instruction
Perform claim requires the step of 1~12 described in any item primary synchronization signal detection methods when operation.
26. a kind of user terminal, including memory and processor, it is stored with computer instruction on the memory, feature exists
In when the computer instruction is run the step of 1~12 described in any item primary synchronization signal detection methods of perform claim requirement.
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