CN103916348B - Calculation methods and systems for phase deviant, timing deviation and frequency deviation - Google Patents
Calculation methods and systems for phase deviant, timing deviation and frequency deviation Download PDFInfo
- Publication number
- CN103916348B CN103916348B CN201210592110.2A CN201210592110A CN103916348B CN 103916348 B CN103916348 B CN 103916348B CN 201210592110 A CN201210592110 A CN 201210592110A CN 103916348 B CN103916348 B CN 103916348B
- Authority
- CN
- China
- Prior art keywords
- frequency
- signal
- phase
- domain
- region signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004364 calculation method Methods 0.000 title abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 45
- 230000010363 phase shift Effects 0.000 claims abstract description 18
- 238000000205 computational method Methods 0.000 claims description 30
- 238000003379 elimination reaction Methods 0.000 claims description 15
- 230000008030 elimination Effects 0.000 claims description 13
- 230000006698 induction Effects 0.000 claims description 12
- 239000013256 coordination polymer Substances 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 108010001267 Protein Subunits Proteins 0.000 claims description 2
- 102100026758 Serine/threonine-protein kinase 16 Human genes 0.000 claims 11
- 101710184778 Serine/threonine-protein kinase 16 Proteins 0.000 claims 11
- 238000004891 communication Methods 0.000 abstract description 4
- 230000009466 transformation Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 8
- 238000012935 Averaging Methods 0.000 description 5
- 125000004122 cyclic group Chemical group 0.000 description 5
- 230000003044 adaptive effect Effects 0.000 description 4
- 230000003595 spectral effect Effects 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
The embodiment of the invention relates to the technical field of communication and discloses a calculation method and system for a phase deviant, a calculation method and system for a timing deviant and a calculation method and system for a frequency deviant. The calculation method for the phase deviant includes: receiving time-domain signals r＜t＞ transmitted through a channel; performing noise cancelling on the time-domain signals r＜t＞; performing rapid fourier transformation on the received time-domain signals r＜t＞ so as to obtain frequency-domain signals r＜f＞; selecting at least one signal r＜M＞, which adopts a multiple phase shift keying (MPSK) modulation method, in the frequency-domain signals r＜f＞ and determining an M value of the value of a constant A of the MPSK modulation method adopted by the frequency-domain signals r＜M＞; and performing M times of self-correlation on the frequency-domain signals r＜M＞ so that the phase deviant can be obtained. Through the calculation methods and systems for the phase deviant, the timing deviation and the frequency deviation, a large quantity of local reference signals are not needed to be saved, calculation can be simplified and the calculation speed can be improved.
Description
Technical field
The present invention relates to communication technical field, and in particular to the computational methods and system of a kind of phase pushing figure, Yi Zhongding
When deviation computational methods and system, the computational methods and system of a kind of exemplary frequency deviation values.
Background technology
Long Term Evolution (referred to as, LTE) technology has two kinds of frame structure types.In the 3rd generation partner program technical specification group
Wireless access network Evolved Universal Terrestrial wireless access (E-UTRA) (version 8) (referred to as, rule in 3GPP TS 36.211 (R81)
Two kinds of frame structure types of LTE system are determined.(referred to as, frame structure Class1 is applied to the FDD of full and half duplex
FDD) pattern.One radio frames includes 20 time slots, and to 19, a subframe definition is two continuous slots to serial number O, i.e. son
FramecIncluding time slot2cWith2c+1.Frame structure type 2 is applied to time division duplex (referred to as, TDD) pattern.Each is wireless frame length is by two
Field is constituted, and each field is made up of five subframes.Each subframecBy 2 time slots2cWith2c+1Represent, the transmission in a time slot
Signal can be described with a resource grid, and its size is downlink bandwidth configuration (abbreviation) it is multiplied by the Resource Block on frequency domain
Size is (referred to as) OFDM symbol number that includes in individual subcarrier and a descending time slot is (referred to as) individual OFDM
(referred to as, OFDM) symbol.Each unit in resource grid is called Resource Unit, is uniquely marked by indexing to (k, l)
Know, whereinWithIt is illustrated respectively in the sequence number of frequency domain and time domain.Resource Block is used to describe thing
Channel to the mapping of Resource Unit is managed, Resource Block is defined as in time domainIn individual continuous OFDM symbol and frequency domainIndividual company
Continuous subcarrier in frequency domain, it by comprising with resource grid in, downlink resource lattice are as shown in Figure 1.In the downlink of LTE system, when
Use conventional cyclic prefix and subcarrier spacing for 15KHz when, in a time slot include 7 OFDM symbols, 12 Resource Block；When
Use extended cyclic prefix and subcarrier spacing for 15KHz when, in a time slot include 6 OFDM symbols, 12 Resource Block, when
When subcarrier spacing is 7.5KHz, 3 OFDM symbols are included in a time slot, wrapped in 24 Resource Block wherein each OFDM symbol
Containing multiple Resource Units, each Resource Unit carries a signal.
Digital modulation is, the frequency spectrum shift of digital baseband signal to high frequency treatment, to form the band logical for being adapted to transmit in the channel
Signal.(referred to as, basic digital modulation mode has amplitude-shift keying (referred to as, ASK), frequency shift keying (referred to as, FSK), phase-shift keying (PSK)
PSK).MPSK (Multiple Phase Shift Keying, multiple phase-shift keying) is the one kind in phase-shift keying (PSK), is profit
The modulation system of digital information is represented with multiple outs of phase (or phase difference) of carrier wave.MPSK modulation is that a kind of permanent mould is adjusted
System, after carrying out MPSK modulation for a series of data, different modulation meet corresponding to different phase constellations, planisphere
On MPSK modulated signals can be expressed as：Wherein A is the integer determined by modulation system, for example, exist
By binary phase shift keying of the MPSK modulated applications in LTE system（BPSK）A=1 during modulation, in QPSK（QPSK）
A=1 etc. in modulation；Q is the number by phase modulation, q=0,1 ..., M-1；M takes 2 positive integer power.
One is by the signal after MPSK modulationSignal after modulation is by the reception after channel
Signal isWherein, argument θ is the local oscillator frequencies due to time delay and transmitter and receiver in the presence of poor
The influence such as different and Doppler frequency shift is produced.Wherein receive the e in signal R (n)jθIt is exactly phase offset of the present invention
Value.
A kind of method for calculating phase pushing figure is provided in the prior art, is obtained by cell special reference
, specifically include following steps：
Step 1, the time-domain signal after receiving terminal is received by transmission
Step 2, the docking collection of letters number carries out denoising elimination；
Step 3, the time-domain signal r that will be receivedtBy FFT to frequency domain rf；
Step 4, small district's groups internal standard knowledge is synchronously obtained by thick respectivelyWith cell ID group
Step 5, byObtain cell IDBy No. ID of cellObtain cell-specific reference
The particular location of signal, so as to obtain cell special reference rf(n)；
Step 6, then by the cell special reference r of frequency domainf(n) and local frequency domain cell special referenceConjugate multiplication is carried out, result Y (n) according to conjugate multiplication=rf(n)·sF is local *(n)=A2ejθTo obtain phase
Position deviant
If using the above method in the prior art, needing to preserve all of local reference signal.With in LTE system
As a example by tdd mode, there are 4 cell special references in conventional cyclic prefix in a Resource Block.When one subframe includes 2
Gap, but because maximum downlink bandwidth is configuredThe so one cell special reference number of subframe
It is 110*4*2=880.A minimum of 2 subframes are used for descending, be up to 8 subframes in the uplink-downlink configuration of the LTE system of tdd mode
For descending, then will at least produce 880*2=1760 local reference signal s in a radio framesF is localN (), at most produces
880*8=7040 local reference signal sF is local(n), but have in the signal for receiving comprising multiple radio frames, then produce and deposit
The local reference signal s of storageF is localN () can be more, the memory consumption of this algorithm is very big, produce local reference signal sF is localN () counts
Calculate along with the computings such as conjugate multiplication cause computational complexity very high, calculating speed is very slow.
The content of the invention
Embodiment of the present invention technical problem to be solved is to provide the computational methods and system of a kind of phase pushing figure, one
Plant the computational methods and system of timing offset value, the computational methods and system of a kind of exemplary frequency deviation values, for simplifying phase offset
The numerical procedure of value, timing offset value and exemplary frequency deviation values, improves calculating speed.
The embodiment of the present invention provides a kind of computational methods of phase pushing figure, including：
Receive by the time-domain signal r of transmissiont；
To the time-domain signal rtCarry out noise elimination；
To the time-domain signal r for receivingtCarry out Fast Fourier Transform (FFT) and obtain frequency-region signal rf;
Select the frequency-region signal rfAt least one signal r of middle use multiple phase-shift keying MPSK modulation systemsM, and
Determine the frequency-region signal rfThe M values and the value of constant A of the multiple phase-shift keying MPSK modulation systems of use；
To the frequency-region signal rMM auto-correlation is carried out to obtainThen may be used
Obtain phase pushing figure
Accordingly, the embodiment of the present invention also provides a kind of computational methods of timing offset value, including：
It is calculated two letters in same OFDM symbol respectively using the computational methods of phase pushing figure as described above
Number phase pushing figure ejθ1And ejθ2；Alternate position spike of described two signals on frequency domain is Δ n；
By the phase pushing figure ejθ2And ejθ2Carry out conjugate multiplication and obtain z (u):
Timing offset estimate d is calculated according to z (u)：
Wherein u represents the ejθ1To induction signal position in a frequency domain, Represent descending
Link bandwidth is configured, and N represents the number of subcarriers included by the OFDM symbol.
Accordingly, the embodiment of the present invention also provides a kind of computational methods of exemplary frequency deviation values, including：
Difference OFDM is accorded with being calculated same time slot respectively using the computational methods of phase pushing figure as described above
The phase pushing figure e of two signals with identical initial phase on numberjθ3And ejθ4；Position of described two signals in time domain
Difference is m2-m1；
By the phase pushing figure ejθ3And ejθ4Carry out conjugate multiplication and obtain z (m):
Frequency offset estimation value Δ f is calculated according to z (m)：
Wherein N represents the number of subcarriers included by the OFDM symbol, NCPRepresent circulating prefix-length, TsRepresent sampling
Interval；Wherein m represents the ejθ3To induction signal position in a frequency domain,
Accordingly, the embodiment of the present invention also provides a kind of computing system of phase pushing figure, including：
Receiving unit, for receiving by the time-domain signal r of transmissiont；
Noise canceling unit, for the time-domain signal rtCarry out noise elimination；
Converter unit, for the time-domain signal r to receivingtCarry out Fast Fourier Transform (FFT) and obtain frequency-region signal rf;
Select unit, for selecting the frequency-region signal rfMiddle use multiple phase-shift keying MPSK modulation systems are at least
One signal rM, and determine the frequency-region signal rMThe M values and constant A of the multiple phase-shift keying MPSK modulation systems of use
Value；
First computing unit, for the frequency-region signal rMM auto-correlation is carried out to obtain So as to obtain phase pushing figure
Accordingly, the embodiment of the present invention also provides a kind of computing system of timing offset value, including：
The computing system of phase pushing figure as described above, for two be calculated respectively in same OFDM symbol
The phase pushing figure e of signaljθ1And ejθ2；Alternate position spike of described two signals on frequency domain is Δ n；
First multiplying unit, for by the phase pushing figure ejθ2And ejθ2Carry out conjugate multiplication and obtain z (u):
Second computing unit, timing offset estimate d is calculated according to z (u)：
Wherein u represents the ejθ1To induction signal position in a frequency domain, Represent descending
Link bandwidth is configured, and N represents the number of subcarriers included by the OFDM symbol.
Accordingly, the embodiment of the present invention also provides a kind of computing system of exemplary frequency deviation values, including：
The computing system of phase pushing figure as described above, for being calculated same time slot respectively in difference OFDM accord with
The phase pushing figure e of two signals with identical initial phase on numberjθ3And ejθ4；Position of described two signals in time domain
Difference is m2-m1；
Second multiplying unit, for by the phase pushing figure ejθ3And ejθ4Carry out conjugate multiplication and obtain z (m):
3rd computing unit, for being calculated frequency offset estimation value Δ f according to z (m)：
Wherein N represents the number of subcarriers included by the OFDM symbol, NCPRepresent circulating prefix-length, TsRepresent sampling
Interval；Wherein m represents the ejθ3To induction signal position in a frequency domain,
The computational methods and system of the phase pushing figure provided in the embodiment of the present invention, are carried out from phase by time-domain signal
Close, can rapidly calculate phase pushing figure, compared to existing technology in technical scheme, without preserve it is substantial amounts of it is local with reference to letter
Number, while also simplify calculation, improve calculating speed.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment
The accompanying drawing for needing to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also obtain according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is the structural representation of downlink resource lattice；
Figure 1A is the schematic flow sheet of the computational methods of the phase pushing figure that the embodiment of the present invention one is provided；
Fig. 2 is the schematic flow sheet of the computational methods of the phase pushing figure that the embodiment of the present invention two is provided；
Fig. 3 is the schematic flow sheet of the computational methods of the timing offset value that the embodiment of the present invention three is provided；
Fig. 4 is the schematic flow sheet of the computational methods of the exemplary frequency deviation values that the embodiment of the present invention four is provided；
Fig. 5 is the structural representation of the computing system of the phase pushing figure that the embodiment of the present invention five is provided；
Fig. 6 is the structural representation of the computing system of the phase pushing figure that the embodiment of the present invention six is provided；
Fig. 7 is the structural representation of the computing system of the timing offset value that the embodiment of the present invention seven is provided；
Fig. 8 is the structural representation of the computational methods of the exemplary frequency deviation values that the embodiment of the present invention eight is provided.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
There is provided the computational methods and system of a kind of phase pushing figure, a kind of meter of timing offset value in the embodiment of the present invention
Method and system are calculated, the computational methods and system of a kind of exemplary frequency deviation values for simplifying the calculating of phase pushing figure, and then enter one
Step simplifies the calculating of timing offset value and exemplary frequency deviation values.It is described in detail individually below.
Embodiment one：
The present invention provides a kind of computational methods of phase pushing figure, as shown in Figure 1A, including：
101st, receive by the time-domain signal r of transmissiont；
102nd, to above-mentioned time-domain signal rtCarry out noise elimination；
The specific method that noise is eliminated in the present embodiment can be processed using method of the prior art, such as using text
Offer：Clear Pan in river, Chang Taihua etc.《The Performance comparision of adaptive noise cancel- ation algorithm and emulation》Science and technology with engineering .2009,
9.9(19):Method disclosed in 5838-5839 carries out denoising elimination, and certain those skilled in the art can also select it
He is processed suitable noise cancellation method, is not especially limited herein；
103rd, the time-domain signal r to receivingtCarry out Fast Fourier Transform (FFT) and obtain frequency-region signal rf;
104th, above-mentioned frequency-region signal r is selectedfAt least one signal of middle use multiple phase-shift keying MPSK modulation systems
rM, and determine above-mentioned frequency-region signal rMThe M values of the multiple phase-shift keying MPSK modulation systems of use；
105th, to above-mentioned frequency-region signal rMM auto-correlation is carried out to obtain
So as to obtain phase pushing figure ejθ：
Further, if being calculated the phase pushing figure of multiple signals using the above method, can be to multiple phases
Deviant averaging, to improve the precision of the phase pushing figure being calculated.
Embodiment two：
The present invention provides a kind of computational methods of phase pushing figure, as shown in Fig. 2 including：
201st, receive by the time-domain signal r of transmissiont；
202nd, to above-mentioned time-domain signal rtCarry out noise elimination；
The specific method that noise is eliminated in the present embodiment can be processed using method of the prior art, such as using text
Offer：Clear Pan in river, Chang Taihua etc.《The Performance comparision of adaptive noise cancel- ation algorithm and emulation》Science and technology with engineering .2009,
9.9(19):Method disclosed in 5838-5839 carries out denoising elimination, and certain those skilled in the art can also select it
He is processed suitable noise cancellation method, is not especially limited herein；
203rd, the time-domain signal r to receivingtCarry out Fast Fourier Transform (FFT) and obtain frequency-region signal rf;
204th, above-mentioned frequency-region signal r is judgedfIn one of signal whether be signal r using MPSK modulation systemsM,
If it is, performing step 205, otherwise continue to frequency-region signal rfIn next signal judged；
In the present embodiment, frequency-region signal r is judgedfIn any one signal whether the specific method modulated by MPSK can be with
It is：The normalization Cyclic spectrum density of the signal is calculated first and position and the peak value of spectral peak is extracted, if peak number is more than 1
For MFSK is modulated, the standard deviation of instantaneous amplitude is calculated if peak number is equal to 1aIf, σa>0.1 is modulated for MASK,
If σa<=0.1 is modulated for MPSK, specifically refers to document：Xu Bin, thunder mountain valley with clumps of trees and bamboo etc.《A kind of digital signal modulation mode identification side
Method》The communication technology, 2011,11 (44):23-24；Certain those skilled in the art can also select other suitable determination methods
To be judged, specific restriction is not made herein；
205th, the signal r of above-mentioned use MPSK modulation systems is selectedM, and determine above-mentioned frequency-region signal rMThe multi-system of use
The M values of phase-shift keying (PSK) MPSK modulation systems and the value of constant A；
Frequency-region signal r is judged in step 204MFor MPSK is modulated（σa<=0.1）When, can be by fixed position in spectrogram
A single spectral line determines the value of M, because the value of A is determined by modulation system, i.e., is determined by M, then after obtaining M values, i.e.,
A values can be obtained；Similarly, those skilled in the art can also determine M values and A values from other suitable methods, not make herein
It is specific to limit；
206th, to above-mentioned frequency-region signal rMM auto-correlation is carried out to obtain
Then can obtain phase pushing figure ejθ：
Further, if being calculated the phase pushing figure of multiple signals using the above method, can be to multiple phases
Deviant averaging, to improve the precision of the phase pushing figure being calculated.
Embodiment three：
The present invention provides a kind of computational methods of phase pushing figure, as shown in figure 3, including：
301st, receive by the time-domain signal r of transmissiont；
302nd, to above-mentioned time-domain signal rtCarry out noise elimination；
The specific method that noise is eliminated in the present embodiment can be processed using method of the prior art, such as using text
Offer clear Pan in river, Chang Taihua etc.《The Performance comparision of adaptive noise cancel- ation algorithm and emulation》Science and technology with engineering .2009,9.9
(19):Method disclosed in 5838-5839 carries out denoising elimination, and certain those skilled in the art can also be from other conjunctions
Suitable noise cancellation method is processed, and is not especially limited herein；
303rd, the time-domain signal r to receivingtCarry out Fast Fourier Transform (FFT) and obtain frequency-region signal rf;
304th, carry out slightly synchronously obtaining small district's groups internal standard knowledge respectively by master sync signal PSS and auxiliary synchronous signals SSSWith cell ID group
305th, byObtain cell IDBy No. ID of cellIt is small in acquisition frequency-region signal
The particular location of area's DRS (Dedicated Reference Signal), so as to select using the cell special reference of QPSK modulation system；
Cell special reference is due to using QPSK modulation, it may be determined that its M value is 4, and A=1；
306th, to above-mentioned cell special reference rM4 auto-correlations are carried out to obtain
So as to obtain phase pushing figure ejθ：
Further, if being calculated the phase pushing figure of multiple signals using the above method, can be to multiple phases
Deviant averaging, to improve the precision of the phase pushing figure being calculated.
Example IV：
The present invention also provides a kind of computational methods of timing offset value, as shown in figure 4, including：
The phase pushing figure e of two signals the 401st, being calculated respectively in same OFDM symboljθ1And ejθ2；The two
The alternate position spike on frequency domain of signal is Δ n；
In the present embodiment, phase pushing figure e can be calculated using the method described in embodiment one or two or threejθ1With
ejθ2, will not be described here；
402nd, by above-mentioned phase pushing figure ejθ2And ejθ2Carry out conjugate multiplication and obtain z (u):
Wherein u represents e described abovejθ1To induction signal position in a frequency domain, Represent
Downlink bandwidth is configured, and N represents the number of subcarriers included by above-mentioned OFDM symbol；
403rd, timing offset estimate d is calculated according to z (u)：Wherein arg is
Seek phase angle oeprator.
Embodiment five：
The present invention also provides a kind of computational methods of exemplary frequency deviation values, as shown in figure 5, including：
501st, being calculated respectively in same time slot has two signals of identical initial phase in different OFDM symbols
Phase pushing figure ejθ3And ejθ4；Position of the two signals in time domain is respectively m1 and m2, and its alternate position spike is m2-m1；
In the present embodiment, phase pushing figure can be calculated using the method described in embodiment one or two or three
ejθ3And ejθ4, will not be described here；
502nd, by above-mentioned phase pushing figure ejθ3And ejθ4Carry out conjugate multiplication and obtain z (m):
Wherein N represents the number of subcarriers included by OFDM symbol, NCPRepresent circulating prefix-length, TsBetween representing sampling
Every；Wherein m represents above-mentioned ejθ3To induction signal position in a frequency domain,
503rd, frequency offset estimation value Δ f is calculated according to z (m)：
Wherein arg is to seek phase angle oeprator.
Embodiment six：
The present invention also provides a kind of computing system 60 of phase pushing figure, as shown in fig. 6, including：
Receiving unit 601, for receiving by the time-domain signal r of transmissiont；
Noise canceling unit 602, for above-mentioned time-domain signal rtCarry out noise elimination；
The specific method of the use of noise canceling unit 602 can be in the present embodiment：Entered using method of the prior art
Row treatment, such as uses document clear Pan in river, Chang Taihua etc.《The Performance comparision of adaptive noise cancel- ation algorithm and emulation》It is scientific and technical
With engineering .2009,9.9 (19):Method disclosed in 5838-5839 carries out denoising elimination, certain those skilled in the art
Can also be processed from other suitable noise cancellation methods, not made specific restriction herein；
Converter unit 603, for the time-domain signal r to receivingtCarry out Fast Fourier Transform (FFT) and obtain frequency-region signal rf;
Select unit 604, for selecting above-mentioned frequency-region signal rfMiddle use multiple phase-shift keying MPSK modulation systems
At least one signal rM, and determine above-mentioned frequency-region signal rMThe M values of the multiple phase-shift keying MPSK modulation systems of use and often
The value of number A；
First computing unit 605, for above-mentioned frequency-region signal rfM auto-correlation is carried out to obtain
So as to obtain phase pushing figure ejθ：
For example, wherein in a kind of implementation method, select unit 604 may particularly include：
Judgment sub-unit, for judging above-mentioned frequency-region signal rfIn one of them whether use MPSK modulation systems；
First choice subelement, for selecting to be judged as the frequency-region signal using MPSK modulation by above-mentioned judgment sub-unit
rM；
First determination subelement, for determining above-mentioned frequency-region signal rMThe M values and constant A of the MPSK modulation systems of use
Value；
It should be noted that above-mentioned judgment sub-unit can use following determination methods：The normalizing of the signal is calculated first
Change Cyclic spectrum density and extract position and the peak value of spectral peak, for MFSK is modulated if peak number is more than 1, if peak number
Equal to 1 standard deviation of calculating instantaneous amplitudeaIf, σa>0.1 is modulated for MASK, if σa<=0.1 is adjusted for MPSK
System, specifically refers to document：Xu Bin, thunder mountain valley with clumps of trees and bamboo etc.《A kind of digital signal modulation mode recognition methods》The communication technology, 2011,11
(44):23-24；Certain those skilled in the art can also be judged from other suitable determination methods, not made herein
It is specific to limit.
It should be noted that above-mentioned determination subelement determines that the method for M values and A can be：Judging frequency-region signal rMFor
MPSK is modulated（σa<=0.1）When, the value of M can be determined by a single spectral line of fixed position in spectrogram, due to A value by
Modulation system determines, i.e., is determined by M, then after obtaining M values, you can acquisition A values；Similarly, those skilled in the art can also
M values and A values are determined from other suitable methods, is not especially limited herein.
For example, in another embodiment, select unit 604 also may particularly include：
Thick synchronization subelement, for carrying out slightly synchronously obtaining small respectively by master sync signal PSS and auxiliary synchronous signals SSS
Mark in district's groupsWith cell ID group
Second selection subelement, for byObtain cell IDBy No. ID of cell
Obtain frequency-region signal rfThe particular location of middle cell special reference, so as to select using QPSK modulation system
Cell special reference；
Second determination subelement, is that 4, A values are for determining that above-mentioned cell special reference uses the M values that MPSK is modulated
1。
It should be noted that cell special reference is 4, corresponding, A values due to using QPSK modulation, its M value
It is 1.
Further, if being calculated the phase pushing figure of multiple signals using said system, the system can also be wrapped
Include：Averaging unit（Not shown in figure）, for multiple phase pushing figure averagings, to improve the phase offset being calculated
The precision of value.
Embodiment seven：
The present invention also provides a kind of computing system of timing offset value, as shown in fig. 7, comprises：
The computing system 60 of the phase pushing figure as described by embodiment six, for being calculated same OFDM respectively
The phase pushing figure e of two signals on symboljθ1And ejθ2；The alternate position spike on frequency domain of the two signals is Δ n；
The particular content of computing system 60 refer to embodiment six, will not be described here；
First multiplying unit 701, for by above-mentioned phase pushing figure ejθ1And ejθ2Carry out conjugate multiplication and obtain z (u):
Wherein u represents above-mentioned ejθ1To induction signal position in a frequency domain, Represent descending
Link bandwidth is configured, and N represents the number of subcarriers included by above-mentioned OFDM symbol；
Second computing unit 702, for being calculated timing offset estimate d according to z (u)：Wherein arg is to seek phase angle oeprator.
Embodiment eight：
The present invention also provides a kind of computing system of exemplary frequency deviation values, as shown in figure 8, including：
The computing system 60 of the phase pushing figure as described by embodiment six, for being calculated same time slot respectively
The phase pushing figure e of two signals with identical initial phase in middle different OFDM symbolsjθ3And ejθ4；The two signals when
Position on domain is respectively m1 and m2, and its alternate position spike is m2-m1；
The particular content of computing system 60 refer to embodiment six, will not be described here；
Second multiplying unit 801, for by above-mentioned phase pushing figure ejθ3And ejθ4Carry out conjugate multiplication and obtain z (m):
Wherein N represents the number of subcarriers included by above-mentioned OFDM symbol, NCPRepresent circulating prefix-length, TsRepresent sampling
Interval；Wherein m represents above-mentioned ejθ3To induction signal position in a frequency domain,
3rd computing unit 803, for being calculated frequency offset estimation value Δ f according to z (m)：
Wherein arg is to seek phase angle oeprator.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is can
Completed with instructing the hardware of correlation by program, the program can be stored in a computer-readable recording medium, storage
Medium can include：Flash disk, read-only storage（Read-Only Memory, ROM）, random access device（Random Access
Memory, RAM）, disk or CD etc..
The computational methods and system of the phase pushing figure for being provided the embodiment of the present invention above, the calculating of timing offset value
Method and system, the computational methods and system of exemplary frequency deviation values are described in detail, and specific case used herein is to this
The principle and implementation method of invention are set forth, the explanation of above example be only intended to help understand the method for the present invention and
Its core concept；Simultaneously for those of ordinary skill in the art, according to thought of the invention, in specific embodiment and should
Be will change with scope, in sum, this specification content should not be construed as limiting the invention.
Claims (10)
1. a kind of computational methods of phase pushing figure, it is characterised in that including：
Receive by the time-domain signal r of transmissiont；
To the time-domain signal rtCarry out noise elimination；
To carrying out the time-domain signal r after noise eliminationtCarry out Fast Fourier Transform (FFT) and obtain frequency-region signal rf；
Select the frequency-region signal rfAt least one signal r of middle use multiple phase-shift keying MPSK modulation systemsM, and determine
The frequency-region signal rMThe M values of the MPSK modulation systems of use and the value of constant A；
To the frequency-region signal rMM auto-correlation is carried out to obtainSo as to obtain
Phase pushing figure
2. method according to claim 1, it is characterised in that the selection frequency-region signal rfMiddle use multi-system phase
Move at least one signal r of keying MPSK modulation systemsMIncluding：
Judge the frequency-region signal rfIn one of signal whether use MPSK modulation systems, if it is, selecting the signal.
3. method according to claim 1, it is characterised in that the selection frequency-region signal rfMiddle use multi-system phase
Move at least one signal r of keying MPSK modulation systemsMIncluding：
Carry out slightly synchronously obtaining small district's groups internal standard knowledge respectively by master sync signal PSS and auxiliary synchronous signals SSSAnd cell
Mark group
ByObtain cell IDBy No. ID of cellObtain the frequency-region signal rfIt is medium and small
The particular location of area's DRS (Dedicated Reference Signal), so as to select using the cell special reference of QPSK modulation system.
4. a kind of computational methods of timing offset value, it is characterised in that including：
It is calculated two signals in same OFDM symbol respectively using the method as described in any one of claims 1 to 3
Phase pushing figure ejθ1And ejθ2；Alternate position spike of described two signals on frequency domain is Δ n；
By the phase pushing figure ejθ1And ejθ2Carry out conjugate multiplication and obtain z (u):
Timing offset estimate d is calculated according to z (u)：
Wherein u represents the ejθ1To induction signal position in a frequency domain, Represent downlink
Band width configuration, N represents the number of subcarriers included by the OFDM symbol.
5. a kind of computational methods of exemplary frequency deviation values, it is characterised in that including：
It is calculated respectively in same time slot in different OFDM symbols using the method as described in any one of claims 1 to 3
The phase pushing figure e of two signals with identical initial phasejθ3And ejθ4；Alternate position spike of described two signals in time domain be
m2-m1；
By the phase pushing figure ejθ3And ejθ4Carry out conjugate multiplication and obtain z (m):
Frequency offset estimation value Δ f is calculated according to z (m)：
WhereinDownlink bandwidth configuration is represented, N represents the number of subcarriers included by the OFDM symbol, NCPExpression is followed
Ring prefix length, TsRepresent the sampling interval；Wherein m represents the ejθ3To induction signal position in a frequency domain,
6. a kind of computing system of phase pushing figure, it is characterised in that including：
Receiving unit, for receiving by the time-domain signal r of transmissiont；
Noise canceling unit, for the time-domain signal rtCarry out noise elimination；
Converter unit, for carrying out the time-domain signal r after noise eliminationtCarry out Fast Fourier Transform (FFT) and obtain frequency-region signal rf；
Select unit, for selecting the frequency-region signal rfAt least one of middle use multiple phase-shift keying MPSK modulation systems
Signal rM, and determine the frequency-region signal rMThe M values and the value of constant A of the multiple phase-shift keying MPSK modulation systems of use；
First computing unit, for the frequency-region signal rMM auto-correlation is carried out to obtain So as to obtain phase pushing figure
7. system according to claim 6, it is characterised in that the select unit includes：
Judgment sub-unit, for judging the frequency-region signal rfIn one of them whether use MPSK modulation systems；
First choice subelement, for selecting to be judged as the frequency-region signal r using MPSK modulation by the judgment sub-unitM；
First determination subelement, for determining the frequency-region signal rMThe M values of the MPSK modulation systems of use and constant A's
Value.
8. system according to claim 6, it is characterised in that the select unit includes：
Thick synchronization subelement, for carrying out slightly synchronously obtaining small district's groups respectively by master sync signal PSS and auxiliary synchronous signals SSS
Interior markWith cell ID group
Second selection subelement, for byObtain cell IDBy No. ID of cellObtain
The frequency-region signal rfThe particular location of middle cell special reference, so as to select using QPSK modulation system
Cell special reference；
Second determination subelement, is that 4, A values are 1 for determining that the cell special reference uses the M values that MPSK is modulated.
9. a kind of computing system of timing offset value, it is characterised in that including：
System as described in claim any one of 6-8, for two signals being calculated respectively in same OFDM symbol
Phase pushing figure ejθ1And ejθ2；Alternate position spike of described two signals on frequency domain is Δ n；
First multiplying unit, for by the phase pushing figure ejθ1And ejθ2Carry out conjugate multiplication and obtain z (u):
Second computing unit, timing offset estimate d is calculated according to z (u)：
Wherein u represents the ejθ1To induction signal position in a frequency domain,Represent descending chain
Road band width configuration, N represents the number of subcarriers included by the OFDM symbol.
10. a kind of computing system of exemplary frequency deviation values, it is characterised in that including：
System as described in any one of claim 6 to 8, for being calculated in same time slot different OFDM symbols respectively
The phase pushing figure e of two signals with identical initial phasejθ3And ejθ4；Alternate position spike of described two signals in time domain be
m2-m1；
Second multiplying unit, for by the phase pushing figure ejθ3And ejθ4Carry out conjugate multiplication and obtain z (m):
3rd computing unit, for being calculated frequency offset estimation value Δ f according to z (m)：
WhereinDownlink bandwidth configuration is represented, N represents the number of subcarriers included by the OFDM symbol, NCPExpression is followed
Ring prefix length, TsRepresent the sampling interval；Wherein m represents the ejθ3To induction signal position in a frequency domain,
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210592110.2A CN103916348B (en) | 2012-12-30 | 2012-12-30 | Calculation methods and systems for phase deviant, timing deviation and frequency deviation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210592110.2A CN103916348B (en) | 2012-12-30 | 2012-12-30 | Calculation methods and systems for phase deviant, timing deviation and frequency deviation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103916348A CN103916348A (en) | 2014-07-09 |
| CN103916348B true CN103916348B (en) | 2017-05-24 |
Family
ID=51041756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210592110.2A Active CN103916348B (en) | 2012-12-30 | 2012-12-30 | Calculation methods and systems for phase deviant, timing deviation and frequency deviation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103916348B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106101039B (en) * | 2016-06-07 | 2019-01-25 | 北京大学 | One kind assisting the adjustable frequency deviation estimating method of precision based on data |
| MX2018015355A (en) * | 2016-06-10 | 2019-03-11 | At & T Ip I Lp | Method and apparatus for use with a radio distributed antenna system having a clock reference. |
| CN108832965B (en) | 2017-05-04 | 2019-11-19 | 大唐移动通信设备有限公司 | A kind of method and device of determining upstream synchronous timing deviation |
| CN110806205B (en) * | 2019-10-30 | 2021-07-27 | 华中科技大学 | Micro unmanned aerial vehicle navigation method based on passive radio frequency tag |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101267422A (en) * | 2008-03-10 | 2008-09-17 | 电子科技大学 | A frequency domain channel estimation method for OFDM multiplex system |
| CN101364964A (en) * | 2007-08-06 | 2009-02-11 | 中兴通讯股份有限公司 | Frequency bias estimation method for radio communication system uplink |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030063678A1 (en) * | 2001-08-21 | 2003-04-03 | Crawford James A. | OFDM pilot tone tracking to reduce performance loss due to frequency pulling and pushing |
| US7616557B2 (en) * | 2004-05-17 | 2009-11-10 | California Institute Of Technology | Method and apparatus for canceling intercarrier interference through conjugate transmission for multicarrier communication systems |
-
2012
- 2012-12-30 CN CN201210592110.2A patent/CN103916348B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101364964A (en) * | 2007-08-06 | 2009-02-11 | 中兴通讯股份有限公司 | Frequency bias estimation method for radio communication system uplink |
| CN101267422A (en) * | 2008-03-10 | 2008-09-17 | 电子科技大学 | A frequency domain channel estimation method for OFDM multiplex system |
Non-Patent Citations (1)
| Title |
|---|
| 相移键控信号（MPSK）载波估计及恢复研究;郝杰;《中国优秀硕士学位论文全文数据库 信息科技辑》;20090315(第3期);第13-34页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103916348A (en) | 2014-07-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10237110B2 (en) | Synchronization method and apparatus in mobile communication system | |
| CN101326739B (en) | Synchronization method and system for mobile communication | |
| CN102246485B (en) | Sequence-generating method, and apparatus for same | |
| US8718099B2 (en) | Transmission apparatus, transmission method, reception apparatus, and reception method | |
| EP3008849B1 (en) | Filterbank-based multicarrier transmitter for transmitting a multicarrier signal | |
| JP2016103838A (en) | Efficient multiplexing of reference signal and data in a wireless communication system | |
| US9742541B2 (en) | User equipment, a radio base station, RBS, and methods therein for transmitting a subframe comprising at least two reference signals, RSS, to the RBS | |
| CN102291351B (en) | Timing synchronization method of receiver in OFDM wireless communication system | |
| CN106105361A (en) | The transmission of random access lead code signal and reception | |
| CN104683280A (en) | Method for precisely estimating large frequency offset of DFT-s-OFDM (Direct Fourier Transformer Spread Orthogonal Frequency Division Multiplexing) system | |
| CN105357160A (en) | Method and device for sending reference signal, and method and device for receiving reference signal | |
| CN103441778B (en) | TD-LTE cell search synchronization method based on CP flat top method | |
| CN102325119A (en) | Joint estimation method of time deviation and frequency deviation | |
| CN103929825A (en) | Multi-user detection method based on ZC sequence | |
| CN103916348B (en) | Calculation methods and systems for phase deviant, timing deviation and frequency deviation | |
| CN104125188B (en) | OFDM (Orthogonal Frequency Division Multiplexing) frequency synchronizing method based on Zadoff-Chu sequence | |
| CN101166352B (en) | An uplink random access method and its realization device and method | |
| US10477547B2 (en) | Ultra-large bandwidth data transmission method, device and computer storage medium | |
| CN106534027B (en) | Method for generating synchronization signal for wireless communication system | |
| WO2017121412A1 (en) | Data modulation for use in multi-carrier system, demodulation method, frame generation method, and node | |
| CN102098259A (en) | Signal emission method in multi-subband orthogonal frequency division multiplexing (OFDM) system | |
| WO2018024127A1 (en) | Signal transmission method and network device | |
| CN109691048B (en) | Transmitter and method for formatting transmission data into frame structure | |
| CN106160969B (en) | A kind of LTE down-going synchronous data transmitting configuration and method of reseptance | |
| CN107666455B (en) | Signal transmission method and network equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180115 Address after: 400060 Yuen No. 8, South Bank district, Chongqing City, B Patentee after: Keen (Chongqing) Microelectronics Technology Co.,Ltd. Address before: 400065 Chongqing Nan'an District huangjuezhen pass Fort Park No. 1 Patentee before: CHONGQING CYIT COMMUNICATION TECHNOLOGIES Co.,Ltd. |
|
| DD01 | Delivery of document by public notice |
Addressee: Chongqing heavy mail communications technology Ltd. Document name: Notification of Approving Refund |
|
| DD01 | Delivery of document by public notice | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20181107 Address after: 201203 Building 1, exhibition hall, 2288 lane, 2288 Chong, road, Zhangjiang hi tech park, Shanghai Patentee after: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Address before: 400060 B Road, 8 Yuen Road, Nan'an District, Chongqing Patentee before: Keen (Chongqing) Microelectronics Technology Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190325 Address after: 361006 Xiamen Free Trade Pilot Area, Xiamen, Fujian Province, Unit X, 8th Floor, Unit 05, Building D, Xiamen International Shipping Center, 97 Xiangyu Road, Xiamen Section Patentee after: Xinxin Finance Leasing (Xiamen) Co.,Ltd. Address before: 201203 Building 1, exhibition hall, 2288 lane, 2288 Chong, road, Zhangjiang hi tech park, Shanghai Patentee before: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. |
|
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20140709 Assignee: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Assignor: Xinxin Finance Leasing (Xiamen) Co.,Ltd. Contract record no.: X2021110000009 Denomination of invention: Calculation method and system of phase offset, timing deviation and frequency deviation Granted publication date: 20170524 License type: Exclusive License Record date: 20210317 |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20221017 Address after: 201203 Shanghai city Zuchongzhi road Pudong New Area Zhangjiang hi tech park, Spreadtrum Center Building 1, Lane 2288 Patentee after: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Address before: 361006 Xiamen Free Trade Pilot Area, Xiamen, Fujian Province, Unit X, 8th Floor, Unit 05, Building D, Xiamen International Shipping Center, 97 Xiangyu Road, Xiamen Section Patentee before: Xinxin Finance Leasing (Xiamen) Co.,Ltd. |