CN109802904A - A kind of frequency deviation estimating method and terminal of narrowband Internet of Things NB-IoT - Google Patents
A kind of frequency deviation estimating method and terminal of narrowband Internet of Things NB-IoT Download PDFInfo
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Abstract
The present invention provides the frequency deviation estimating method and terminal of a kind of narrowband Internet of Things NB-IoT, method includes: the narrowband primary synchronization signal NPSS for obtaining the network equipment and sending；Identical First ray and the second sequence are chosen in NPSS；According to First ray and second sequence, offset estimation value is calculated.The present invention calculates offset estimation value using narrow band sync signal NPSS, and number of samples is more, and computational accuracy is high, it and is after receiving synchronization signal to offset estimation, frequency deviation is calculated after signal is synchronous, at this moment without carrying out channel estimation, enormously simplifies algorithm complexity.
Description
Technical field
The present invention relates to the frequency deviation estimating methods and end of field of communication technology more particularly to a kind of narrowband Internet of Things NB-IoT
End.
Background technique
Offset estimation is to the important in inhibiting such as channel estimation, signal demodulation, offset estimation side commonly used in the prior art
Formula mainly has demodulated reference signal (Demodulation Reference Signal, DMRS) method and cyclic prefix (Cyclic
Prefix, CP) method.Wherein, DMRS method specifically: correspond to pilot tone using the time-domain symbol that number is 3 and 10 in a subframe and accord with
Number, carry out relevant treatment using the channel estimation coefficient of the two on frequency domain and obtain corresponding correlation, recycle correlation and
The time interval of two frequency pilot signs obtains frequency deviation value.CP method specifically: by the last of time-domain symbol (or being OFDM symbol)
If doing copy is placed on the front end of OFDM symbol, head and the tail two parts data of such OFDM symbol be it is identical, in this way when
CP data data identical with OFDM symbol end are subjected to relevant treatment on domain and obtain correlation, recycle correlation and time
Interval carries out offset estimation.
For narrowband Internet of Things (Narrow Band Internet of Things, NB-IoT) system, system bandwidth is only
200KHz is occupied, a resource block being equivalent in Long-Term Evolution (Long Time Evolution, LTE) system
(Resource Block, RB), the frame structure of NB-IoT system, synchronization and the definition of frequency pilot sign are different from LTE system, often
The useful information of a symbol is seldom.According to DMRS method, since DMRS only has 1 RB size in NB-IoT system, frequency domain is carried
Wave number is according to less, offset estimation poor effect.According to CP method, since the useful points of subcarrier in frequency domain are very little, offset estimation is missed
Difference is larger.Therefore, traditional frequency excursion algorithm is no longer desirable for the offset estimation of NB-IoT system.
Summary of the invention
The present invention provides the frequency deviation estimating method and terminal of a kind of narrowband Internet of Things NB-IoT, and narrowband can not be calculated by solving
The frequency deviation problem of Internet of Things NB-IoT system.
The embodiment of the present invention provides the frequency deviation estimating method of narrowband Internet of Things NB-IoT a kind of, comprising:
Obtain the narrowband primary synchronization signal NPSS that the network equipment is sent；
Identical First ray and the second sequence are chosen in NPSS；
According to First ray and the second sequence, offset estimation value is calculated.
Wherein, the step of identical First ray and the second sequence are chosen in NPSS, comprising:
According to default sample rate, M time-domain symbol preceding in NPSS is sampled, First ray is obtained；
According to default sample rate, sampled in NPSS with the identical M time-domain symbol of preceding M time-domain symbol,
Obtain the second sequence.
Wherein, according to First ray and the second sequence, the step of calculating offset estimation value, comprising:
It is multiplied to First ray and the second sequence conjugate, obtains intermediate variable；
According to plural trigonometric function formula, the phase angle of intermediate variable is calculated；
According to the preset relation of phase angle and frequency deviation value, offset estimation value corresponding with phase angle is calculated.
Wherein, the step of being multiplied to First ray and the second sequence conjugate, obtaining intermediate variable, comprising:
According to formula(s2 (n) * conj (s1 (n))), is calculated intermediate variable R；
Wherein, R indicates that intermediate variable, s1 (n) indicate that First ray, s2 (n) indicate the second sequence, and N indicates First ray
With the maximum number of samples of the second sequence.
Wherein, it according to the preset relation of phase angle and frequency deviation value, the step of calculating offset estimation value corresponding with phase angle, wraps
It includes:
According to formulaCalculate offset estimation value f corresponding with phase angle；
Wherein, f indicates offset estimation value, and arg (R) indicates that the phase angle of intermediate variable, M indicate default sample rate, and Δ L is indicated
The sampling number of First ray and the second train interval.
The embodiment of the invention also provides a kind of terminals, comprising:
Module is obtained, for obtaining the narrowband primary synchronization signal NPSS of network equipment transmission；
Module is chosen, for choosing identical First ray and the second sequence in NPSS；
Computing module, for calculating offset estimation value according to First ray and the second sequence.
Wherein, choosing module includes:
First sampling unit samples M time-domain symbol preceding in NPSS for according to default sample rate, obtains the
One sequence；
Second sampling unit is used for according to default sample rate, to a with the preceding identical M of M time-domain symbol in NPSS
Time-domain symbol is sampled, and the second sequence is obtained.
Wherein, computing module includes:
First computing unit obtains intermediate variable for being multiplied to First ray and the second sequence conjugate；
Second computing unit, for calculating the phase angle of intermediate variable according to plural trigonometric function formula；
Third computing unit calculates offset estimation corresponding with phase angle for the preset relation according to phase angle and frequency deviation value
Value.
Wherein, the first computing unit is specifically used for:
According to formula(s2 (n) * conj (s1 (n))), is calculated intermediate variable R；
Wherein, R indicates that intermediate variable, s1 (n) indicate that First ray, s2 (n) indicate the second sequence, and N indicates First ray
With the maximum number of samples of the second sequence.
Wherein, third computing unit is specifically used for:
According to formulaCalculate offset estimation value f corresponding with phase angle；
Wherein, f indicates offset estimation value, and arg (R) indicates that the phase angle of intermediate variable, M indicate default sample rate, and Δ L is indicated
The sampling number of First ray and the second train interval.
The embodiment of the invention also provides a kind of terminals, including transceiver, for obtaining the narrowband master of network equipment transmission
Synchronization signal NPSS；
Processor is connect with transceiver, for realizing following function: chosen in NPSS identical First ray and
Second sequence, and according to First ray and the second sequence, calculate offset estimation value.
Wherein, processor is specifically used for:
According to default sample rate, M time-domain symbol preceding in NPSS is sampled, First ray is obtained；
According to default sample rate, sampled in NPSS with the identical M time-domain symbol of preceding M time-domain symbol,
Obtain the second sequence.
Wherein, processor is also used to:
It is multiplied to First ray and the second sequence conjugate, obtains intermediate variable；
According to plural trigonometric function formula, the phase angle of intermediate variable is calculated；
According to the preset relation of phase angle and frequency deviation value, offset estimation value corresponding with phase angle is calculated.
Wherein, processor is specifically used for:
According to formula(s2 (n) * conj (s1 (n))), is calculated intermediate variable R；
Wherein, R indicates that intermediate variable, s1 (n) indicate that First ray, s2 (n) indicate the second sequence, and N indicates First ray
With the maximum number of samples of the second sequence.
Wherein, processor is specifically used for:
According to formulaCalculate offset estimation value f corresponding with phase angle；
Wherein, f indicates offset estimation value, and arg (R) indicates that the phase angle of intermediate variable, M indicate default sample rate, and Δ L is indicated
The sampling number of First ray and the second train interval.
The embodiment of the invention also provides a kind of computer readable storage medium, deposited on the computer readable storage medium
Computer program is contained, the offset estimation side of above-mentioned narrowband Internet of Things NB-IoT is realized when computer program is executed by processor
The step of method.
The beneficial effect of above-mentioned technical proposal of the invention is: offset estimation value is calculated using narrow band sync signal NPSS,
Number of samples is more, and computational accuracy is high, and is to calculate frequency after signal is synchronous after receiving synchronization signal to offset estimation
Partially, algorithm complexity at this moment is enormously simplified without carrying out channel estimation.
Detailed description of the invention
Fig. 1 shows the flow diagrams of the frequency deviation estimating method of the NB-IoT of the embodiment of the present invention；
Fig. 2 indicates the time-frequency domain distribution schematic diagram of NPSS in the embodiment of the present invention；
The module diagram of Fig. 3 expression the terminal of that embodiment of the invention；
The terminal block diagram of Fig. 4 expression embodiment of the present invention.
Specific embodiment
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
Body embodiment is described in detail.In the following description, such as specific configuration is provided and the specific detail of component is only
In order to help comprehensive understanding the embodiment of the present invention.It therefore, it will be apparent to those skilled in the art that can be to reality described herein
Example is applied to make various changes and modifications without departing from scope and spirit of the present invention.In addition, for clarity and brevity, it is omitted pair
The description of known function and construction.
It should be understood that " one embodiment " or " embodiment " that specification is mentioned in the whole text mean it is related with embodiment
A particular feature, structure, or characteristic is included at least one embodiment of the present invention.Therefore, occur everywhere in the whole instruction
" in one embodiment " or " in one embodiment " not necessarily refer to identical embodiment.In addition, these specific features, knot
Structure or characteristic can combine in any suitable manner in one or more embodiments.
In various embodiments of the present invention, it should be appreciated that the size of the serial number of following each processes is not meant to execute suitable
Sequence it is successive, the execution of each process sequence should be determined by its function and internal logic, the implementation without coping with the embodiment of the present invention
Process constitutes any restriction.
In addition, the terms " system " and " network " are often used interchangeably herein.
In embodiment provided herein, it should be appreciated that " B corresponding with A " indicates that B is associated with A, can be with according to A
Determine B.It is also to be understood that determine that B is not meant to determine B only according to A according to A, it can also be according to A and/or other information
Determine B.
As shown in Figure 1, the embodiment provides the frequency deviation estimating methods of narrowband Internet of Things NB-IoT a kind of, specifically
The following steps are included:
Step 11: obtaining the narrowband primary synchronization signal NPSS that the network equipment is sent.
Wherein, narrow band sync signal includes narrowband primary synchronization signal (Narrowband Primary
Synchronization Signal, NPSS) and narrowband secondary synchronization signal (Narrowband Secondary
Synchronization Signal, NSSS), NPSS provides ginseng for the Domain Synchronous and frequency domain synchronization of the terminal of NB-IoT system
Signal is examined, the terminal in NB-IoT system can first detect NPSS in cell searching, therefore NPSS may be designed as short ZC
(Zadoff-Chu) sequence, to reduce preliminary signals detection and synchronous complexity.It is worth noting that different from LTE system
, any cell information is not carried in NPSS, and the period is 10ms, and NSSS carries Physical Cell Identifier (Physical
Cell Identifier, PCI), the period is 20ms.
Step 12: identical First ray and the second sequence are chosen in NPSS.
The time-frequency domain distribution schematic diagram of NPSS as shown in Figure 2, first three time-domain symbol in NPSS (number 3 in corresponding diagram,
4 with 5) and below three time-domain symbol (number 9,10 and 11 in corresponding diagram) is identical, therefore can be by this two parts information
It is extracted in time domain, is denoted as First ray s1 (n) and the second sequence s2 (n) respectively, n is in First ray or the second sequence
Sampled point.
Step 13: according to First ray and the second sequence, calculating offset estimation value.
The offset estimation value of NB-IoT is calculated according to the First ray selected and the second sequence, number of samples is more, calculates essence
Degree is high, and is frequency deviation to be calculated after signal is synchronous, at this moment without carrying out after receiving synchronization signal to offset estimation
Channel estimation enormously simplifies algorithm complexity.
Wherein, step 12 specifically may be accomplished by: according to default sample rate, accord with to M time domain preceding in NPSS
It number is sampled, obtains First ray；According to default sample rate, to it is M identical with preceding M time-domain symbol in NPSS when
Domain symbol is sampled, and the second sequence is obtained.Wherein, default sample rate can take empirical value, in order to simplify operation, preset sampling
16 times of drops that NPSS sample rate can be used in rate adopt rate, and wherein NPSS sample rate is 30.72MHz, and presetting sample rate is 30.72/16
=1.92MHz, then the sampling number in a time-domain symbol data domain are as follows: the duration of 1 time domain (OFDM) symbol divided by
The rate of adopting=2048/16=128 drops, and for CP, the sequence of 160 sampled points, CP length is 160/16=10, for
The sequence of 144 sampled points, CP length are 144/16=9.First ray includes 3 time-domain symbols, due to these three time domains
In symbol CP length be 9, then it includes sampling number are as follows: 3*128+3*9=411, the sampling that similarly the second sequence includes
Points are as follows: the value of n is up to 411 in 3*128+3*9=411 and s1 (n) and s2 (n).
Further, step 13 includes: to be multiplied to First ray and the second sequence conjugate, obtains intermediate variable；According to multiple
Number trigonometric function formula, calculates the phase angle of intermediate variable；According to the preset relation of phase angle and frequency deviation value, calculate corresponding with phase angle
Offset estimation value.
Wherein, the step of being multiplied to First ray and the second sequence conjugate, obtaining intermediate variable include:
According to formula(s2 (n) * conj (s1 (n))), is calculated intermediate variable R；
Wherein, R indicates that intermediate variable, s1 (n) indicate that First ray, s2 (n) indicate the second sequence, and N indicates First ray
With the maximum number of samples of the second sequence.
Wherein, since the mobility of NB-IoT is very low, channel tends to divide, therefore the phase angle of intermediate variable and frequency deviation phase
It closes, the preset relation of phase angle and frequency deviation value is arg (R)=2 π * Δ L*f/M, therefore according to the preset relation of phase angle and frequency deviation value,
The step of calculating offset estimation value corresponding with phase angle, comprising:
According to formulaCalculate offset estimation value f corresponding with phase angle；
Wherein, f indicates offset estimation value, and arg (R) indicates that the phase angle of intermediate variable, M indicate default sample rate, and Δ L is indicated
The sampling number of First ray and the second train interval.Specifically, in order to simplify operation, NPSS sampling is can be used in default sample rate
16 times of drops of rate adopt rate, and wherein NPSS sample rate is 30.72MHz, sample rate M=30.72/16=1.92MHz are preset, then one
The sampling number in a time-domain symbol data domain are as follows: the duration of 1 time domain (OFDM) symbol is divided by the drop rate of adopting=2048/16=
128, for CP, the sequence of 160 sampled points, CP length is 160/16=10, for the sequence of 144 sampled points,
Its CP length is 144/16=9.Due to 6 OFDM symbols of First ray and the second train interval, have 5 in this 6 OFDM symbols
The CP length of a symbol is that the CP length of 9,1 symbols is 10.So Δ L=6*128+5*9+10=823.
In the frequency deviation estimating method of the NB-IoT of the embodiment of the present invention, terminal calculates frequency deviation using narrow band sync signal NPSS
Estimated value, number of samples is more, and computational accuracy is high, and is to synchronize it in signal after receiving synchronization signal to offset estimation
After calculate frequency deviation, at this moment without carrying out channel estimation, enormously simplify algorithm complexity.
Just the frequency deviation estimating method of narrowband Internet of Things NB-IoT of the invention makes introductions to above embodiments respectively, below
Embodiment will be described further its corresponding terminal in conjunction with attached drawing.
Specifically, as shown in figure 3, the terminal 300 of the embodiment of the present invention includes:
Module 310 is obtained, for obtaining the narrowband primary synchronization signal NPSS of network equipment transmission；
Module 320 is chosen, for choosing identical First ray and the second sequence in NPSS；
Computing module 330, for calculating offset estimation value according to First ray and the second sequence.
Wherein, choosing module 320 includes:
First sampling unit samples M time-domain symbol preceding in NPSS for according to default sample rate, obtains the
One sequence；
Second sampling unit is used for according to default sample rate, to a with the preceding identical M of M time-domain symbol in NPSS
Time-domain symbol is sampled, and the second sequence is obtained.
Wherein, computing module 330 includes:
First computing unit obtains intermediate variable for being multiplied to First ray and the second sequence conjugate；
Second computing unit, for calculating the phase angle of intermediate variable according to plural trigonometric function formula；
Third computing unit calculates offset estimation corresponding with phase angle for the preset relation according to phase angle and frequency deviation value
Value.
Wherein, the first computing unit is specifically used for:
According to formula(s2 (n) * conj (s1 (n))), is calculated intermediate variable R；
Wherein, R indicates that intermediate variable, s1 (n) indicate that First ray, s2 (n) indicate the second sequence, and N indicates First ray
With the maximum number of samples of the second sequence.
Wherein, third computing unit is specifically used for:
According to formulaCalculate offset estimation value f corresponding with phase angle；
Wherein, f indicates offset estimation value, and arg (R) indicates that the phase angle of intermediate variable, M indicate default sample rate, and Δ L is indicated
The sampling number of First ray and the second train interval.
Terminal embodiment of the invention is corresponding with the embodiment of frequency deviation estimating method of above-mentioned narrowband Internet of Things NB-IoT
, all realization rates in above method embodiment can also reach identical technology suitable for the embodiment of the terminal
Effect.The terminal calculates offset estimation value using narrow band sync signal NPSS, and number of samples is more, and computational accuracy is high, and estimates to frequency deviation
Meter is to calculate frequency deviation after signal is synchronous after receiving synchronization signal, significantly simple at this moment without carrying out channel estimation
Algorithm complexity is changed.
In order to preferably realize above-mentioned purpose, as shown in figure 4, the present embodiment provides a kind of terminals, comprising:
Processor 41；And the memory 43 being connected by bus interface 42 with the processor 41, the memory
43 for storing the processor 41 used program and data when executing operation, when processor 41 calls and executes described
When the program and data that are stored in memory 43, following process is executed.
Wherein, transceiver 44 is connect with bus interface 42, for sending and receiving data under the control of processor 41, is had
Body is used to obtain the narrowband primary synchronization signal NPSS of network equipment transmission；Processor 41 is connect with transceiver 44, is specifically used for:
Identical First ray and the second sequence are chosen in NPSS, and according to First ray and the second sequence, are calculated frequency deviation and estimated
Evaluation.
Wherein, processor 41 is specifically used for:
According to default sample rate, M time-domain symbol preceding in NPSS is sampled, First ray is obtained；
According to default sample rate, sampled in NPSS with the identical M time-domain symbol of preceding M time-domain symbol,
Obtain the second sequence.
Wherein, processor 41 is also used to:
It is multiplied to First ray and the second sequence conjugate, obtains intermediate variable；
According to plural trigonometric function formula, the phase angle of intermediate variable is calculated；
According to the preset relation of phase angle and frequency deviation value, offset estimation value corresponding with phase angle is calculated.
Wherein, processor 41 is specifically used for:
According to formula(s2 (n) * conj (s1 (n))), is calculated intermediate variable R；
Wherein, R indicates that intermediate variable, s1 (n) indicate that First ray, s2 (n) indicate the second sequence, and N indicates First ray
With the maximum number of samples of the second sequence.
Wherein, processor 41 is specifically used for:
According to formulaCalculate offset estimation value f corresponding with phase angle；
Wherein, f indicates offset estimation value, and arg (R) indicates that the phase angle of intermediate variable, M indicate default sample rate, and Δ L is indicated
The sampling number of First ray and the second train interval.
It should be noted that bus architecture may include the bus and bridge of any number of interconnection in Fig. 4, specifically by
The various circuits for the memory that the one or more processors and memory 43 that processor 41 represents represent link together.Bus
Framework can also link together various other circuits of such as peripheral equipment, voltage-stablizer and management circuit or the like,
These are all it is known in the art, and therefore, it will not be further described herein.Bus interface provides interface.Transmitting-receiving
Machine 44 can be multiple element, that is, includes transmitter and transceiver, provide for logical with various other devices over a transmission medium
The unit of letter.For different terminals, user interface 45, which can also be, external the interface for needing equipment is inscribed, and connection is set
Standby including but not limited to keypad, display, loudspeaker, microphone, control stick etc..Processor 41 be responsible for management bus architecture and
Common processing, memory 43 can store the used data when executing operation of processor 41.
It will be understood by those skilled in the art that realize above-described embodiment all or part of step can by hardware come
It completes, relevant hardware can also be indicated by computer program to complete, the computer program includes executing above-mentioned side
The instruction of some or all of step of method；And the computer program can store in a readable storage medium storing program for executing, storage medium
It may be any type of storage medium.
In addition it should be pointed out that in the apparatus and method of the present invention, it is clear that each component or each step are can to divide
It solves and/or reconfigures.These, which decompose and/or reconfigure, should be regarded as equivalent scheme of the invention.Also, execute above-mentioned system
The step of column processing, can execute according to the sequence of explanation in chronological order naturally, but not need centainly suitable according to the time
Sequence executes, and certain steps can execute parallel or independently of one another.For those of ordinary skill in the art, it is to be understood that this
The whole or any steps or component of the method and apparatus of invention, can any computing device (including processor, storage
Medium etc.) perhaps to be realized with hardware, firmware, software or their combination in the network of computing device, this is this field
Basic programming skill of the those of ordinary skill in the case where having read explanation of the invention with them can be achieved with.
Therefore, the purpose of the present invention can also by run on any computing device a program or batch processing come
It realizes.The computing device can be well known fexible unit.Therefore, the purpose of the present invention can also include only by offer
The program product of the program code of the method or device is realized to realize.That is, such program product is also constituted
The present invention, and the storage medium for being stored with such program product also constitutes the present invention.Obviously, the storage medium can be
Any well known storage medium or any storage medium that developed in the future.It may also be noted that of the invention
In device and method, it is clear that each component or each step can be decomposed and/or be reconfigured.These decomposition and/or again group
Conjunction should be regarded as equivalent scheme of the invention.Also, the step of executing above-mentioned series of processes can be naturally according to the sequence of explanation
It executes in chronological order, but does not need centainly to execute sequentially in time.Certain steps can parallel or independently of one another
It executes.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (12)
1. a kind of frequency deviation estimating method of narrowband Internet of Things NB-IoT characterized by comprising
Obtain the narrowband primary synchronization signal NPSS that the network equipment is sent；
Identical First ray and the second sequence are chosen in the NPSS；
According to the First ray and second sequence, offset estimation value is calculated.
2. the frequency deviation estimating method of Internet of Things NB-IoT in narrowband according to claim 1, which is characterized in that described described
The step of identical First ray and the second sequence are chosen in NPSS, comprising:
According to default sample rate, M time-domain symbol preceding in the NPSS is sampled, First ray is obtained；
According to the default sample rate, in the NPSS with the preceding identical M time-domain symbol of M time-domain symbol into
Row sampling, obtains the second sequence.
3. the frequency deviation estimating method of Internet of Things NB-IoT in narrowband according to claim 1, which is characterized in that described according to institute
The step of stating First ray and second sequence, calculating offset estimation value, comprising:
It is multiplied to the First ray and the second sequence conjugate, obtains intermediate variable；
According to plural trigonometric function formula, the phase angle of the intermediate variable is calculated；
According to the preset relation of phase angle and frequency deviation value, offset estimation value corresponding with the phase angle is calculated.
4. the frequency deviation estimating method of Internet of Things NB-IoT in narrowband according to claim 3, which is characterized in that described to described
The step of First ray and the second sequence conjugate are multiplied, obtain intermediate variable, comprising:
According to formulaIntermediate variable R is calculated；
Wherein, R indicates intermediate variable, and s1 (n) indicates the First ray, and s2 (n) indicates second sequence, described in N expression
The maximum number of samples of First ray and second sequence.
5. the frequency deviation estimating method of Internet of Things NB-IoT in narrowband according to claim 3, which is characterized in that described according to phase
The step of preset relation at angle and frequency deviation value, calculating offset estimation value corresponding with the phase angle, comprising:
According to formulaCalculate offset estimation value f corresponding with the phase angle；
Wherein, f indicates offset estimation value, and arg (R) indicates that the phase angle of the intermediate variable, M indicate default sample rate, and Δ L is indicated
The sampling number of the First ray and second train interval.
6. a kind of terminal characterized by comprising
Module is obtained, for obtaining the narrowband primary synchronization signal NPSS of network equipment transmission；
Module is chosen, for choosing identical First ray and the second sequence in the NPSS；
Computing module, for calculating offset estimation value according to the First ray and second sequence.
7. a kind of terminal characterized by comprising
Transceiver, for obtaining the narrowband primary synchronization signal NPSS of network equipment transmission；
Processor is connect with the transceiver, for realizing following function: identical first sequence is chosen in the NPSS
Column and the second sequence, and according to the First ray and second sequence, calculate offset estimation value.
8. terminal according to claim 7, which is characterized in that the processor is specifically used for:
According to default sample rate, M time-domain symbol preceding in the NPSS is sampled, First ray is obtained；
According to the default sample rate, in the NPSS with the preceding identical M time-domain symbol of M time-domain symbol into
Row sampling, obtains the second sequence.
9. terminal according to claim 8, which is characterized in that the processor is also used to:
It is multiplied to the First ray and the second sequence conjugate, obtains intermediate variable；
According to plural trigonometric function formula, the phase angle of the intermediate variable is calculated；
According to the preset relation of phase angle and frequency deviation value, offset estimation value corresponding with the phase angle is calculated.
10. terminal according to claim 9, which is characterized in that the processor is specifically used for:
According to formulaIntermediate variable R is calculated；
Wherein, R indicates intermediate variable, and s1 (n) indicates the First ray, and s2 (n) indicates second sequence, described in N expression
The maximum number of samples of First ray and second sequence.
11. terminal according to claim 9, which is characterized in that the processor is specifically used for:
According to formulaCalculate offset estimation value f corresponding with the phase angle；
Wherein, f indicates offset estimation value, and arg (R) indicates that the phase angle of the intermediate variable, M indicate default sample rate, and Δ L is indicated
The sampling number of the First ray and second train interval.
12. a kind of computer readable storage medium, which is characterized in that be stored with computer on the computer readable storage medium
Program realizes Internet of Things NB-IoT in narrowband described in any one of claims 1 to 5 when computer program is executed by processor
The step of frequency deviation estimating method.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110601719A (en) * | 2019-09-26 | 2019-12-20 | 北京智联安科技有限公司 | Simplified algorithm for coarse synchronization autocorrelation of NB-IoT (NB-IoT) terminal |
| CN111093253A (en) * | 2019-12-27 | 2020-05-01 | 重庆物奇科技有限公司 | Main synchronization signal fine search method of narrow-band Internet of things NB-IoT |
| CN113422748A (en) * | 2021-06-23 | 2021-09-21 | 广州粒子微电子有限公司 | Method and device for estimating frequency offset in narrowband Internet of things and storage medium |
| CN114070685A (en) * | 2021-11-01 | 2022-02-18 | 泰凌微电子(上海)股份有限公司 | Frequency offset estimation method and device |
| CN114124628A (en) * | 2021-09-09 | 2022-03-01 | 广州粒子微电子有限公司 | Method and device for estimating frequency offset in narrowband Internet of things and storage medium |
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| CN113422748A (en) * | 2021-06-23 | 2021-09-21 | 广州粒子微电子有限公司 | Method and device for estimating frequency offset in narrowband Internet of things and storage medium |
| CN113422748B (en) * | 2021-06-23 | 2022-07-26 | 广州粒子微电子有限公司 | Method and device for estimating frequency offset in narrowband Internet of things and storage medium |
| CN114124628A (en) * | 2021-09-09 | 2022-03-01 | 广州粒子微电子有限公司 | Method and device for estimating frequency offset in narrowband Internet of things and storage medium |
| CN114124628B (en) * | 2021-09-09 | 2023-10-20 | 广州粒子微电子有限公司 | Method, device and storage medium for estimating frequency offset in narrowband Internet of things |
| CN114070685A (en) * | 2021-11-01 | 2022-02-18 | 泰凌微电子(上海)股份有限公司 | Frequency offset estimation method and device |
| CN114070685B (en) * | 2021-11-01 | 2023-12-08 | 泰凌微电子(上海)股份有限公司 | Frequency offset estimation method and device |
| CN114726696A (en) * | 2022-03-09 | 2022-07-08 | 芯翼信息科技(上海)有限公司 | Frequency offset estimation method based on narrow band system, terminal and storage medium |
| CN114726696B (en) * | 2022-03-09 | 2024-04-12 | 芯翼信息科技(上海)有限公司 | Frequency offset estimation method, terminal and storage medium based on narrowband system |
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