CN108989259A - The time offset estimation method and system of wireless comprehensive test instrument narrowband Physical Uplink Shared Channel - Google Patents
The time offset estimation method and system of wireless comprehensive test instrument narrowband Physical Uplink Shared Channel Download PDFInfo
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Abstract
The present invention provides a kind of time offset estimation method and system of wireless comprehensive test instrument narrowband Physical Uplink Shared Channel, the time offset estimation method is the following steps are included: step S1, first time offset estimation is carried out to the data for the narrowband Physical Uplink Shared Channel that acquisition receives, is set with obtaining the first start bit of data；Step S2 extracts the two-part narrowband demodulation reference signal time domain data in front and back, obtains the first time domain data and the second time domain data；Step S3 calculates first time domain data at current time and the correlation of the second time domain data；Step S4 judges whether maximum related value is greater than preset threshold value according to the correlation, until maximum related value be greater than preset threshold value, then reaffirm the second initial position of data.The present invention can effectively reduce the calculating time span of time offset estimation, also can guarantee that work is good in the case where big frequency deviation, and then can obtain better Symbol Timing estimation performance, and have certain anti-frequency deviation effect.
Description
Technical field
The present invention relates to a kind of time offset estimation method more particularly to a kind of wireless comprehensive test instrument narrowband Physical Uplink Shared Channels
Time offset estimation method, and be related to using the wireless comprehensive test instrument narrowband Physical Uplink Shared Channel time offset estimation method when
Inclined estimating system.
Background technique
Orthogonal frequency division multiplex OFDM technology is since its availability of frequency spectrum is high, anti-multipath fading ability is strong, transmits the spies such as reliable
Point has become transmission technology most competitive in mobile communication system.OFDM is modulated using orthogonal sub-carriers, to load
The orthogonality of wave is more sensitive, once orthogonality is destroyed, just will form self-interference, performance degradation.And sign synchronization
Error will cause intersymbol interference, destroy the orthogonality of subcarrier, larger to systematic influence, therefore accurate sign synchronization is very
It is important.
Current existing timing synchronization algorithm is broadly divided into two classes, i.e. data auxiliary (DA) algorithm or non-data is auxiliary
Help (NDA) algorithm (i.e. blind estimate).DA algorithm can be further divided into two kinds again, first is that the method based on training symbol sequence,
Second is that the method based on insertion frequency pilot sign, but these methods can all reduce data rate, under the availability of frequency spectrum for leading to system
Drop.NDA algorithm utilizes the structure of OFDM symbol, is such as estimated based on virtual subcarrier and cyclic prefix.It is carried based on virtual subnet
The blind estimate of wave, it is computationally intensive using characteristics of needs value diversity when Subspace algorithm, it realizes more complex；Based on cyclic prefix
For maximum likelihood (ML) algorithm vulnerable to data, the precision of the influence of noise and channel, algorithm is not high.
NB-IOT (NarrowBand Internet of Things, narrowband IOT) is a kind of based on cellular narrowband Internet of Things
Network technology supports low power consuming devices to connect in the cellular data of wide area network.NB-IOT be mainly used in poor throughput, can tolerate compared with
The scene of long time delay and Hypomobility, such as intelligent electric meter, remote sensor and intelligent building.NB-IOT can be deployed directly into existing
In GSM or LTE network, i.e., smooth upgrade is realized to reduce lower deployment cost in the existing base station of reusable.
NB-IOT uplink defines narrowband physical layer Uplink Shared Channel (NPUSCH) and narrowband physical layer connects at random
Enter channel (NPRACH).Present patent application is mainly concerned with the timing synchronization of NPUSCH channel.It is narrow in NB-IOT system
It is mainly used to the data information and control information of transmission terminal with Physical Uplink Shared Channel (NPUSCH).NB-IOT system it is upper
Row transmitted bandwidth is 180kHz, and uplink supports that 3.75kHz and 15kHz subcarrier spacing, multi-access mode are single carrier simultaneously
Frequency division multiple access (SC-FDMA)；List carrier wave is only supported to dispatch using the subcarrier spacing of 3.75kHz, and between the subcarrier of 15kHz
Every the scheduling for supporting list carrier wave and multi-subcarrier simultaneously.For the subcarrier spacing for being more preferably adapted to 3.75kHz, protocol definition is new
Length be 2ms narrowband structure of time slot.Shown in following Fig. 2 and Fig. 3, a radio frames include 5 narrowband time slots, each narrowband
Time slot includes 7 orthogonal frequency division multiplexing (OFDM) symbols.
Wherein, the running time-frequency resource grid of a time slot in Fig. 2 and Fig. 3 (includesA subcarrier andA SC-
FDMA symbol).For Δ f=15kHz, the time-gap number of a radio frames is ns∈ { 0,1 ..., 19 }, For
Δ f=3.75kHz, ns∈ { 0,1 ..., 4 },
NB-IOT uplink introduces the concept of resource unit, the scheduling of upstream data and the transmission of HARQ-ACK information
It is all as unit of resource unit.One resource unit is defined as in time domainA continuous SC-FDMA symbol and frequency
In domainA continuous subcarrier, whereinWithIt is as shown in the table:
The resource unit and timeslot number that NPUSCH different-format includes
As seen from the above table: for single tone NPUSCH, if using a 3.75kHz subcarrier spacing,
Then the span of its RU in the time domain is 32ms；If using a single 15kHz subcarrier, the span of RU in the time domain
For 8ms.
For multi-tone NPUSCH, when using 3 subcarriers, the span of RU in the time domain is 4ms；Make
When with 6 subcarriers, the span of RU in the time domain is 2ms；When using 12 subcarriers, the span of RU in the time domain is
1ms。
For NPUSCH format 2, if RU is in time domain using a single 3.75kHz subcarrier
On span be 8ms, if using a single 15kHz subcarrier, the span of RU in the time domain be 2ms.
In NB-IOT system, for NPUSCH Format 1, there are one lead each time slot of Physical Uplink Shared Channel
Frequency sequence, i.e. narrowband demodulation reference signal (NDMRS, Narrow Demodulation Reference Signal).It is wherein every
Two adjacent NDMRS Transmission Time Intervals having the same (being separated by 7 OFDM symbols).Reference signal NDMRS is mainly used for
The channel estimation of Physical Uplink Shared Channel and time, Frequency Synchronization.
When production test, wired connection is generallyd use, DUT is connected to wireless comprehensive test instrument.DUT and wireless comprehensive test instrument
It is two independent systems, therefore the processing time of the forward delay interval of signal and ADC can all cause the time migration of symbol, such as
Fruit directly demodulates signal, will cause intersymbol interference, influences the orthogonality of subcarrier.It therefore must before signal processing
It must carry out accurate timing synchronization.
Consider that baseband signal is carried out up-conversion by carrier modulation, then connect by an ofdm communication system, transmitter
Receipts machine carries out signal by using identical local carrier to be down-converted to base band.IFFT and FFT be respectively transmitter modulation and
The basic function of receiver demodulation.In order to carry out the FFT of N point in receiver, need to obtain within the OFDM symbol period to transmitting
The accurate sampling of signal.In other words, in order to detect the starting point of each (after removing CP) OFDM symbol, it is necessary to execute symbol
Timing Synchronization facilitates to obtain accurate sampling in this way.Assuming that there are the time migrations of δ size in time domain, then it is in sample rate
FsIn the case where, then there can be τ sampled point offset THS=δ Fs。
Summary of the invention
The technical problem to be solved by the present invention is to need to provide one kind to obtain better Symbol Timing estimation performance,
And there is the time offset estimation method of the wireless comprehensive test instrument narrowband Physical Uplink Shared Channel of certain anti-frequency deviation effect, go forward side by side one
Step provides the time offset estimation system for using the time offset estimation method of the wireless comprehensive test instrument narrowband Physical Uplink Shared Channel.
In this regard, the present invention provides a kind of time offset estimation method of wireless comprehensive test instrument narrowband Physical Uplink Shared Channel, including
Following steps:
Step S1 carries out the first time offset estimation to the data for the narrowband Physical Uplink Shared Channel that acquisition receives, to obtain
The first start bit of access evidence is set；
Step S2 extracts the two-part narrowband demodulation reference signal time domain data in front and back, obtains the first time domain data and the
Two time domain datas；
Step S3 calculates first time domain data at current time and the correlation of the second time domain data；
Step S4 judges whether maximum related value is greater than preset threshold value according to the correlation, until maximal correlation
Value is greater than preset threshold value, then reaffirms the second initial position of data.
A further improvement of the present invention is that including following sub-step in the step S1:
Step S101 obtains the data of the narrowband Physical Uplink Shared Channel received；
Step S102 carries out the first time offset estimation by double sliding window power detection, and then obtains the first starting of data
Position.
A further improvement of the present invention is that the step S2 includes following sub-step:
Step S201, in the frequency domain modulation data of locally generated narrowband demodulation reference signal, and described in calculating and record
The sign of the frequency domain modulation data of narrowband demodulation reference signal；
Step S202 extracts the narrowband demodulation reference signal time domain data of previous section, obtains the first time domain data；
Step S203 extracts the narrowband demodulation reference signal time domain data of aft section, obtains the second time domain data.
A further improvement of the present invention is that in the step S201, the frequency domain modulation of the narrowband demodulation reference signal
Whether data are tone signal, if then described positive and negative according to calculating according to the frequency domain number of complex symbols of the narrowband demodulation reference signal
Number；If otherwise by the sign of rotation position 1 of the sign of the frequency domain modulation data of the narrowband demodulation reference signal.
A further improvement of the present invention is that passing through formula in the step S201 It calculates described under tone signal mode
The sign sign of the frequency domain modulation data of narrowband demodulation reference signalNDMRS(k1), or, setting signNDMRS(k1)=1；Wherein,k1It being indexed for the subscript of narrowband demodulation reference signal, real () indicates to take the real part of complex signal,
Imag () indicates to take the imaginary part of complex signal, SNDMRSIt (k) is the frequency domain number of complex symbols evidence of the narrowband demodulation reference signal, 0≤k
≤NNDMRS- 1, NNDMRSFor the single-carrier frequency division multiple access symbol numbers of narrowband demodulation reference signal.
A further improvement of the present invention is that passing through formula in the step S202 Extract the first time domain dataWherein, n1For timeslot number rope
Draw, m be current time slots number time domain sampling point index, τ be shift relevant operation length index, totalSymLen for comprising
The time domain total length of one single-carrier frequency division multiple access symbol of cyclic prefix, r are received time domain data.
A further improvement of the present invention is that passing through formula in the step S203
Extract the second time domain dataWherein, n2For timeslot number index, m is that the time domain sampling point of current time slots number indexes, τ
For the length index for shifting relevant operation, totalSymLen is a single-carrier frequency division multiple access symbol comprising cyclic prefix
Time domain total length,For the sign of local NDMRS data, r is received time domain data.
A further improvement of the present invention is that passing through formula in the step S3
Calculate first time domain data and second at current time
The correlation of time domain dataWherein pNDmrsData1 and pNDmrsData2 be respectively current time the first time domain data and
The numerical value of second time domain data.
A further improvement of the present invention is that the step S4 includes following sub-step:
Step S401 calculates τ=τ+1；
Step S402, judges whether τ is greater than Nstart+NcorrLen- 1, if otherwise return step S2, if going to step
S403；
Step S403, uses formulaSearch obtains maximum phase
Pass value, and maximum related value is compared with pre-set threshold value, if the maximum related value is greater than the threshold value,
ThenFor time offset estimation value；Otherwise, then mistake is returned.
The present invention also provides a kind of time offset estimation systems of wireless comprehensive test instrument narrowband Physical Uplink Shared Channel, use such as
The time offset estimation method of the upper wireless comprehensive test instrument narrowband Physical Uplink Shared Channel.
Compared with prior art, the beneficial effects of the present invention are: to the shared letter of the narrowband physical uplink that receives of acquisition
The data in road carry out double sliding window power detection, obtain rough initial position, it is possible to reduce the time offset estimation segmented below
Calculate time span；Then by extracting to the two-part narrowband demodulation reference signal time domain data in front and back, then pass through the
The correlation of one time domain data and the second time domain data looks for peak value, to determine the time offset estimation of subdivision, the big frequency deviation the case where
Under also can guarantee that work is good, and then better Symbol Timing estimation performance can be obtained, and there is certain anti-frequency deviation effect
Fruit；Carry out wireless comprehensive test instrument more accurately to DUT (equipment under test) data in lesser complexity
Time offset estimation can be very good the requirement for meeting production test.
Detailed description of the invention
Fig. 1 is the workflow schematic diagram of an embodiment of the present invention；
Fig. 2 is the structure of time slot schematic diagram under a subcarrier spacings of narrowband Internet of Things；
Fig. 3 is the structure of time slot schematic diagram under another subcarrier spacings of narrowband Internet of Things；
Fig. 4 is Symbol Timing estimation schematic illustration of an embodiment of the present invention based on cyclic prefix；
When Fig. 5 is narrowband Physical Uplink Shared Channel in the case of an embodiment of the present invention subcarrier spacing is 15kHz
Domain structure figure；
Fig. 6 is the workflow schematic diagram for the sign of rotation position that an embodiment of the present invention generates local sign；
Fig. 7 is the detailed operation flow diagram of an embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawing, preferably embodiment of the invention is described in further detail.
This example first explains term: NB-IOT (Narrow Band Internet of Things) is narrowband Internet of Things
Net；NPUSCH (Narrowband Physical Uplink Shared Channel) is narrowband Physical Uplink Shared Channel；
OFDM (Orthogonal Frequency Division Multiplexing) is orthogonal frequency division multiplexing；DA(Data Aided)
For data auxiliary；NDA (Non Data Aided) is unbound nucleus；ML (Maximum Likelihood) estimates for maximum likelihood
Meter；GSM (Global System for Mobile Communication) is global system for mobile communications；LTE(Long
Term Evolution) it is long term evolution；SC-FDMA(Single-carrier Frequency-Division Multiple
It Access) is single-carrier frequency division multiple access.
Assuming that there is only the timing error of τ size, not any phase noises between transmitter and receiver.Then time domain
Receiving signal can indicate are as follows:Wherein n=1,2 ... N adopts for time domain
The serial number of sampling point, k=1,2 ..., N are subcarrier in frequency domain serial number, and N is the number of sampling, and H [k] is that the frequency domain of each subcarrier is believed
Road parameter, X [k] are the frequency domain data sent, and z [n] is the channel Gaussian noise of time domain.NPUSCH letter based on NB-IOT system
The format in road, the time offset estimation technology generally used have time offset estimation based on cyclic prefix (CP) and based on training sequence when
Estimation partially.
Time domain STO estimation technique based on cyclic prefix is analyzed as shown in figure 4, CP (cyclic prefix) is one in OFDM symbol
The copy of partial data.This means that CP (cyclic prefix) and corresponding data portion is identical.And this something in common
It can be used for the estimation to STO.As shown in figure 4, B and B ' respectively indicates the N of CPGThe N of a sampling and data portionGA sampling.Note
Meaning, B is identical with two sampling blocks in B ', and two sampling blocks are separated by NsubA sampling.Consider two sliding window W1 and
W2.Its spacing distance is NsubA sampling.It may search for sampling direct similarity in two windows by sliding window W1 and W2.When
The N when CP of OFDM symbol is fallen in W1, in two windowsGA direct similarity of sampling block reaches maximum.Most it is worth using this
Point can identify STO.When the difference in W1 and W2 between two sampling blocks is minimum, the similarity of the two blocks reaches maximum.Institute
To be made by search (by N in two windowsGWhat a sampling was constituted) differences of two blocks be minimized where point, it will be able to estimate
Count out STO:
Although this technically simple, when, there are when CFO, performance can decline in reception system.
Another Symbol Timing estimation based on training sequence is baseband receiving signals and the local after utilizing down coversion
The NDMRS sequence of storage does sliding computing cross-correlation, and the position of correlation peak is used to determine the timing synchronization position of system.
Estimated accuracy based on cyclic prefix algorithm is related with the length of cyclic prefix CP, and cyclic prefix CP length is longer to be estimated
It is higher to count precision.Symbol Timing estimation based on cyclic prefix can be very good the variation of adaptive channel, but cyclic prefix holds
Vulnerable to the influence of intersymbol interference, the accuracy decline of estimation is caused.Due to the circulation of the SC-FDMA symbol of NPUSCH channel
Prefix is relatively short, wherein also needing to exclude due to the influence such as adding window and non-serviceable length, uses cyclic prefix
It is not high to carry out Symbol Timing estimated accuracy.In practical cellular communication, generally when UE random access with regard to having carried out
The time delay estimation of whole system, then UE will do it when sending signal sending time and adjust, and guarantee that base station receives
NPUSCH signal within CP.But under the non-signaling test pattern of comprehensive test instrument, do not carry out that UE is synchronous and random access this
A little processes, but it is synchronous to need accurately to carry out time migration again.
In this case, this example is (narrow for can disposably obtain the complete NPUSCH of a packet under wireless comprehensive test mode
Band Physical Uplink Shared Channel) data, the sequential extraction procedures of the NDMRS signal (narrowband demodulation reference signal) in data are come out,
Then it is grouped, then two groups of NDMRS signals (narrowband demodulation reference signal) is subjected to Symbol Timing estimation, so that it may obtain more
Good Symbol Timing estimates performance, and has certain anti-frequency deviation effect.
Therefore, as shown in Figure 1 and Figure 7, this example provide a kind of wireless comprehensive test instrument narrowband Physical Uplink Shared Channel when it is inclined
Estimation method, comprising the following steps:
Step S1 carries out the first time offset estimation to the data for the narrowband Physical Uplink Shared Channel that acquisition receives, to obtain
The first start bit of access evidence is set；
Step S2 extracts the two-part narrowband demodulation reference signal time domain data in front and back, obtains the first time domain data and the
Two time domain datas；
Step S3 calculates first time domain data at current time and the correlation of the second time domain data；
Step S4 judges whether maximum related value is greater than preset threshold value according to the correlation, until maximal correlation
Value is greater than preset threshold value, then reaffirms the second initial position of data.
Include following sub-step in step S1 described in this example:
Step S101 obtains the data of the narrowband Physical Uplink Shared Channel received；
Step S102 carries out the first time offset estimation by double sliding window power detection, and the first start bit for obtaining data is set.
The first start bit is set to thick initial position, and second initial position is fine initial position.
More specifically, NPUSCH channel includes NDMRS sequence, and this example uses power window detection to obtain signal first
Coarse timing synchronization, i.e., the first time offset estimation of the described step S102, to obtain rough initial position, the step is using existing
Double sliding window power detection can be realized；Then all NDMRS sequences for extracting NPUSCH signal carry out the thin fixed of subsequent step
When synchronous (more accurate time offset estimation).
Assuming that the NPUSCH signal for receiving packet burst is r (t), 0≤t < Tp, wherein TpFor this packet signal it is total when
It is long.Down coversion is carried out to the signal received, the digital baseband signal after the processing such as ADC sampling is r (n), 0≤n < Np,
Middle NpIt always counts for baseband digital signal to be processed.
Thick time offset estimation is carried out using double sliding window power detection first, obtains the thick initial position N of useful signalstart,
The thick initial position NstartFor the initial position obtained step S1.
It next is exactly to carry out thin time offset estimation using the NDMRS signal that receives, for NPUSCH Format1 format,
Assuming that subcarrier spacing is Δ f, timeslot number Nslot, then according to spatial structure figure as shown in Figure 5, the SC-FDMA of NDMRS is accorded with
Number number is NDMRS=Nslot.For the single tone mode of NPUSCH, the frequency domain data of NDMRS is that absolute value is equal,
There may be the case where contrary sign, therefore each NDMRS symbol can't have very strong correlation after being transformed into time domain.
Therefore for single tone (single tone refers to tone signal, under single tone mode, one
A NDMRS frequency domain symbol data correspond to the SC-FDMA symbol of a NDMRS of time domain) in the case of, first locally generated
NDMRS frequency domain modulation data, and record the sign of each frequency domain NDMRS data.Assuming that the frequency domain of the local NDMRS generated
Number of complex symbols evidence is SNDMRS(k),0≤k≤NNDMRS- 1, then according to formula
The sign of NDMRS frequency domain data is obtained, wherein
That is, step S2 described in this example preferably includes following sub-step:
Step S201, in the frequency domain modulation data of locally generated narrowband demodulation reference signal, and described in calculating and record
The sign of the frequency domain modulation data of narrowband demodulation reference signal；
Step S202 extracts the narrowband demodulation reference signal time domain data of previous section, obtains the first time domain data；
Step S203 extracts the narrowband demodulation reference signal time domain data of aft section, obtains the second time domain data.
As shown in fig. 6, in step S201 described in this example, the frequency domain modulation data of the narrowband demodulation reference signal whether be
Tone signal, if then according to the frequency domain number of complex symbols of the narrowband demodulation reference signal according to the calculating sign；If otherwise
By the sign of rotation position 1 of the sign of the frequency domain modulation data of the narrowband demodulation reference signal.
More specifically, in step S201 described in this example, pass through formula
Calculate the sign sign of the frequency domain modulation data of the narrowband demodulation reference signal under tone signal modeNDMRS(k1),
Wherein,For under multitone mode (multi tone mode) k1It is indexed for the subscript of narrowband demodulation reference signal, real () indicates to take the reality of complex signal
Portion, imag () indicate to take the imaginary part of complex signal, SNDMRSIt (k) is the frequency domain number of complex symbols evidence of the narrowband demodulation reference signal, 0
≤k≤NNDMRS- 1, NNDMRSFor the single-carrier frequency division multiple access symbol numbers of narrowband demodulation reference signal.
In step S202 described in this example, pass through formula Extract the first time domain dataWherein, n1For timeslot number index, m is that the time domain of current time slots number is adopted
Sampling point index, τ are the length index for shifting relevant operation, and totalSymLen is a single carrier frequency division comprising cyclic prefix
The time domain total length of multiple access symbol, r are the time domain data received.
In step S203 described in this example, pass through formula
Extract the second time domain
DataWherein, n2For timeslot number index, m is the time domain sampling point rope of current time slots number
Draw, τ is the length index for shifting relevant operation, and totalSymLen is the single-carrier frequency division multiple access symbol comprising cyclic prefix
Number time domain total length,Represent the sign of local NDMRS data, r be receive when
Numeric field data.
More specifically, when this example defines two variables and is used to extract the two-part NDMRS in front and back for receiving signal respectively
Numeric field data, it is assumed that the two variables are respectively pNDmrsData1 and pNDmrsData2.Then pNDmrsData1 data can indicate
ForWherein, Nstart≤τ≤Nstart+NcorrLen- 1,0≤m≤totalSymLen-1。n1For timeslot number index, m is the time-domain sampling of current time slots number
Point index, τ are the length index for shifting relevant operation, and totalSymLen is a SC-FDMA symbol comprising cyclic prefix
Time domain total length.
Then pNDmrsData2 data can be expressed as
Wherein Nstart≤τ≤Nstart+NcorrLen- 1,0≤m≤totalSymLen-1。
n2For timeslot number index, m is that the time domain sampling point of current time slots number indexes, and τ is the index of timing slip, and totalSymLen is
The time domain total length of a SC-FDMA symbol comprising cyclic prefix.
It is noted that can be seen that the data for pNDmrsData2 from formula above, need according to local
The NDMRS symbol position of storage carries out the rotation of sign.Therefore for different τ, when needing each to pNDmrsData2
Each time domain data point in gap carries out a symbol rotation, the time-consuming computationally compared in this way.
As long as by actual analysis it can be found that meeting NcorrLenIn the case where < totanSymLen, it is only necessary to τ=
Nstart, symbol rotation is carried out to totalSymLen time domain sampling point of each time slot of pNDmrsData2, for τ > Nstart
(it is unsatisfactory for τ=NstartWith regard to using τ > NstartMode), it is only necessary to phase rotation is carried out to a point newly increasing, such as
Shown in Fig. 7, NcorrLenPartially synchronous points when being maximum, therefore above formula can be modified are as follows:
Wherein τ=Nstart,0≤m≤totalSymLen-1。
Wherein Nstart+1≤τ≤Nstart+NcorrLen- 1,M=totalSymLen-1.
That is, under different conditions to the value of τ and m, two methods are compared, what first method needed in total
Cycle-index are as follows: NcorrLen*NNDMRS* totalSymLen/2, the cycle-index that second method needs in total areTherefore, τ=N is chosen for the value of τ and mstart,0≤m≤totalSymLen-1 or Nstart+1≤τ≤Nstart+NcorrLen- 1,It, can be with saving algrithm time-consuming when m=totalSymLen-1.τ at this is that displacement is related
The length of operation indexes, and m is that the time domain sampling point of current time slots number indexes.
Next the pNDmrsData1 data to the current τ moment of acquisition and pNDmrsData2 data carry out correlometer
It calculates.That is in step S3 described in this example, pass through formulaWhen calculating current
The correlation of the first time domain data and the second time domain data carvedWherein pNDmrsData1 and pNDmrsData2 is respectively and works as
First time domain data at preceding moment and the numerical value of the second time domain data.
Here it can be seen that carrying out the relevant method of time domain by using NDMRS, can gradually by time offset estimation more
Accurately, the double sliding window power detection by the first step, can obtain the initial position of rough useful signal, it is possible to reduce after
The calculating time span of the thin time offset estimation in face.Then the NDMRS data of data are received by extracting, then by the NDMRS number of extraction
According to being split into two halves, then the related method for looking for peak value to determine thin time offset estimation is carried out, can also worked in the case where big frequency deviation good
It is good.And the case where carrying out thin time offset estimation, under single tone mode, NDMRS data the case where there are contrary signs,
First in locally generated frequency domain NDMRS number of complex symbols evidence, clock synchronization is then determined the need for according to the sign of the data of generation
Numeric field data carries out sign rotation.Finally allow comprehensive test instrument in lesser complexity more accurately to DUT data
Time offset estimation is carried out, can be very good to meet production test.In summary based on the time offset estimation of NDMRS in comprehensive test instrument system
The process of algorithm is as shown in Figure 6.
As shown in fig. 7, step S4 described in this example includes following sub-step:
Step S401 calculates τ=τ+1；
Step S402, judges whether τ is greater than Nstart+NcorrLen- 1, if otherwise return step S2, if going to step
S403；
Step S403, uses formulaSearch obtains maximum phase
Pass value, and maximum related value is compared with pre-set threshold value, if the maximum related value is greater than the threshold value,
ThenFor time offset estimation value, this makes it possible to thus calculate more accurate time offset estimation；Otherwise, then mistake is returned, it is current to believe
The estimation failure of number Symbol Timing.
The present invention also provides a kind of time offset estimation systems of wireless comprehensive test instrument narrowband Physical Uplink Shared Channel, use such as
The time offset estimation method of the upper wireless comprehensive test instrument narrowband Physical Uplink Shared Channel.
Shown in sum up, this example carries out double sliding window power to the data for the narrowband Physical Uplink Shared Channel that acquisition receives
Detection, obtains rough initial position, it is possible to reduce the calculating time span of the time offset estimation segmented below；Then by preceding
Two-part narrowband demodulation reference signal time domain data extracts afterwards, then passes through the first time domain data and the second time domain data
Correlation looks for peak value, to determine the time offset estimation of subdivision, also can guarantee that work is good in the case where big frequency deviation, and then can
Better Symbol Timing estimation performance is obtained, and there is certain anti-frequency deviation effect；Finally wireless comprehensive test instrument is existed
Time offset estimation more accurately is carried out to DUT (equipment under test) data in the case of lesser complexity, can be very good to meet production
The requirement of test.
More specifically, then this example will first by extracting the NDMRS data of each time slot in wireless comprehensive test instrument
NDMRS data are divided into two pieces, i.e. first half and latter half, then pass through this side according to relevant calculation is carried out to two block numbers
Method can resist influence of the frequency deviation to time offset estimation.
For under single-tone mode (single tone mode), the NDMRS modulation sequence contrary sign of frequency domain leads to the SC- of time domain
The poor situation of FDMA symbol correlation is marked using sign rotation first in locally generated NDMRS modulation sequence, is then obtained
Will position carries out sign compensation to received NDMRS data.NPUSCH carries out the software of time offset estimation using the NDMRS extracted
Framework.
I.e. this example proposes for the time offset estimation problem of NPUSCH demodulation in NB-IOT and uses double sliding window power first
Detection carries out thick time offset estimation；Then the NDMRS data for extracting each time slot, will be inclined when carrying out thin again after NDMRS deblocking
Estimation, and NDMRS frequency domain modulation symbols are only generated by local, it can solve under single-tone mode (single tone mode)
The problem of the SC-FDMA time domain data correlation difference of each NDMRS.By software design, reduce single-tone mode (single
Tone mode) under sign rotation computation complexity.By this method, when can bring very high to wireless comprehensive test instrument
Inclined estimated accuracy, and can also work well in the case where big frequency deviation, and do not need locally generated time domain NDMRS data,
Reduce computation complexity.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (10)
1. a kind of time offset estimation method of wireless comprehensive test instrument narrowband Physical Uplink Shared Channel, which is characterized in that including following step
It is rapid:
Step S1 carries out the first time offset estimation to the data for the narrowband Physical Uplink Shared Channel that acquisition receives, to obtain number
According to first start bit set；
Step S2 extracts the two-part narrowband demodulation reference signal time domain data in front and back, when obtaining the first time domain data and second
Numeric field data；
Step S3 calculates first time domain data at current time and the correlation of the second time domain data；
Step S4 judges whether maximum related value is greater than preset threshold value according to the correlation, until maximum related value is big
In preset threshold value, then the second initial position of data is reaffirmed.
2. the time offset estimation method of wireless comprehensive test instrument narrowband according to claim 1 Physical Uplink Shared Channel, feature
It is, includes following sub-step in the step S1:
Step S101 obtains the data of the narrowband Physical Uplink Shared Channel received；
Step S102 carries out the first time offset estimation by double sliding window power detection, and then the first start bit for obtaining data is set.
3. the time offset estimation method of wireless comprehensive test instrument narrowband according to claim 1 or 2 Physical Uplink Shared Channel, special
Sign is that the step S2 includes following sub-step:
Step S201 in the frequency domain modulation data of locally generated narrowband demodulation reference signal, and calculates and records the narrowband
The sign of the frequency domain modulation data of demodulated reference signal；
Step S202 extracts the narrowband demodulation reference signal time domain data of previous section, obtains the first time domain data；
Step S203 extracts the narrowband demodulation reference signal time domain data of aft section, obtains the second time domain data.
4. the time offset estimation method of wireless comprehensive test instrument narrowband according to claim 3 Physical Uplink Shared Channel, feature
It is, in the step S201, whether the frequency domain modulation data of the narrowband demodulation reference signal are tone signal, if then root
According to the frequency domain number of complex symbols of the narrowband demodulation reference signal according to the calculating sign；If otherwise the narrowband demodulation is referred to
The sign of rotation position 1 of the sign of the frequency domain modulation data of signal.
5. the time offset estimation method of wireless comprehensive test instrument narrowband according to claim 4 Physical Uplink Shared Channel, feature exist
In passing through formula in the step S201
Calculate the sign sign of the frequency domain modulation data of the narrowband demodulation reference signal under tone signal modeNDMRS(k1), or, setting
Set signNDMRS(k1)=1；Wherein,k1It is indexed for the subscript of narrowband demodulation reference signal, real
() indicates to take the real part of complex signal, and imag () indicates to take the imaginary part of complex signal, SNDMRSIt (k) is the narrowband demodulation reference signal
Frequency domain number of complex symbols evidence, 0≤k≤NNDMRS- 1, NNDMRSFor the single-carrier frequency division multiple access symbol of narrowband demodulation reference signal
Number.
6. the time offset estimation method of wireless comprehensive test instrument narrowband according to claim 5 Physical Uplink Shared Channel, feature
It is, in the step S202, passes through formulaIt extracts
First time domain dataWherein, n1For timeslot number index, m is the time domain sampling point rope of current time slots number
Draw, τ is the length index for shifting relevant operation, and totalSymLen is the single-carrier frequency division multiple access symbol comprising cyclic prefix
Number time domain total length, r is the time domain data received.
7. the time offset estimation method of wireless comprehensive test instrument narrowband according to claim 5 Physical Uplink Shared Channel, which is characterized in that
In the step S203, pass through formulaIt mentions
Take the second time domain dataWherein, n2For timeslot number index, m be current time slots number when
Domain sampled point index, τ are the length index for shifting relevant operation, and totalSymLen is a single carrier comprising cyclic prefix
The time domain total length of frequency division multiple access symbol,The sign of local NDMRS mapping data is represented,
R is the time domain data received.
8. the time offset estimation method of wireless comprehensive test instrument narrowband according to claim 7 Physical Uplink Shared Channel, feature
It is, in the step S3, passes through formulaCalculate current time
The correlation of first time domain data and the second time domain dataWhen wherein pNDmrsData1 and pNDmrsData2 is respectively current
The numerical value of the first time domain data and the second time domain data carved.
9. the time offset estimation method of wireless comprehensive test instrument narrowband according to claim 8 Physical Uplink Shared Channel, feature
It is, the step S4 includes following sub-step:
Step S401 calculates τ=τ+1；
Step S402, judges whether τ is greater than Nstart+NcorrLen- 1, if otherwise return step S2, if going to step
S403；
Step S403, uses formulaSearch obtains maximum related value,
And be compared maximum related value with pre-set threshold value, if the maximum related value is greater than the threshold value,For
Time offset estimation value；Otherwise, then mistake is returned.
10. a kind of time offset estimation system of wireless comprehensive test instrument narrowband Physical Uplink Shared Channel, which is characterized in that use as weighed
Benefit requires the time offset estimation method of wireless comprehensive test instrument narrowband Physical Uplink Shared Channel described in 1 to 9 any one.
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