CN105827363A - PUCCH channel format blind detection method in LTE/LTE-A system - Google Patents
PUCCH channel format blind detection method in LTE/LTE-A system Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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Abstract
The invention, which belongs to the technical field of wireless communication, discloses a PUCCH channel format blind detection method in an LTE/LTE-A system. The method comprises: According to PUCCH time-frequency resource distribution, time domain data of a first SC-FDMA symbol where PUCCH data needing detection are located and a second SC-FDMA symbol where PUCCH data needing detection are located are taken out, fast fourier transform (FFT) to a frequency domain is carried out, and then frequency-domain data of the two symbols are found; relevance of the two SC-FDMA symbols is detected; if no peak value exists, a PUCCH format 3 is determined and detection is finished; and otherwise, a real part module value and a virtual part module value of a related peak value are compared, a PUCCH format 1/1a/1b or a PUCCH format 2/2a/2b is determined. According to the method, needed parameters are reduced and blind detection can be realized. The operation load is low and the FFT operation only needs to be carried twice and the 12-point cyclic cross-correlation operation only needs to be carried out once; and for the cyclic cross-correlation operation, the operation load can be reduced based on equivalence of the cyclic cross-correlation and cyclic convolution.
Description
Technical field
The invention belongs to wireless communication technology field, relate to LTE/LTE-A (Long-Term Evolution/Long-Term
Evolution Advanced) method of up PUCCH channel format blind check in system.
Background technology
The up spatial structure figure of LTE/LTE-A system is as it is shown in figure 1, in time domain, LTE/LTE-A transmission is organized in length
For in the radio frames of 10ms, each radio frames is divided into the subframe of 10 an equal amount of a length of 1ms, and each subframe has two
Individual an equal amount of time slot is constituted, and a length of 0.5ms of each time slot, each time slot is by a number of SC-FDMA
(Single-carrier Frequency-Division Multiple Access, single-carrier frequency division multiple access) symbol forms.SC-FDMA
The number of symbol is by CP (cyclic prefix, Cyclic Prefix) type decided, and when using common CP, each time slot comprises 7
SC-FDMA symbol；The when of using extension CP, each time slot comprises 6 SC-FDMA symbols.
As it is shown in figure 1, in LTE/LTE-A system, each SC-FDMA symbol is made up of CP and symbol main body two parts.
Wherein CP is by being replicated by the end of SC-FDMA symbol main part, and is inserted into SC-FDMA symbol main part
Front end obtains.By inserting CP, can be at ISI (the inter symbol preventing SC-FDMA intersymbol from being caused by time dispersive
Interference, intersymbol interference) while, it is ensured that the orthogonality between subcarrier.
PUCCH (Physical Uplink Control Channel, physical uplink control channel) is LTE/LTE-A system
One physical channel of middle up-link, wherein carries ascending control information.Arrange PUCCH be intended that user not by
During scheduling, when being i.e. not previously allocated UL-SCH (Uplink Shared Channel, Uplink Shared Channel) resource, user utilizes
PUCCH transmission L1/L2 controls information, including channel status reporting (pre-coding matrix instruction PMI and channel quality indicator (CQI)),
HARQ confirms (ACK/NACK) and dispatch request.
PUCCH mono-has 3 class forms, wherein has 3 kinds of forms respectively in the first kind and Equations of The Second Kind, a kind of lattice of the 3rd apoplexy due to endogenous wind
Formula, as shown in table 1,
The parameter of PUCCH under the 3 class forms of table 1 PUCCH
Transmission in the case of wherein form 2a and form 2b is only used for common prefix.Carrying out PUCCH demodulation when,
Must first have to know the form that PUCCH is used, just can carry out follow-up demodulation.In LTE/LTE-A system, user
PUCCH format used should be known to base station.But under the application scenarios that some are special, such as " signal analyzer "
This class application in, the PUCCH format that measured signal is used is unknown, or needs manual configuration, otherwise need into
Row blind check.Therefore the blind check of PUCCH format is necessary.
Summary of the invention
The present invention proposes a kind of method of up PUCCH channel format blind check in LTE/LTE-A system, and its step is as follows:
Step 1: according to the time-frequency resource allocating of PUCCH, takes out first of the PUCCH data place needing detection and the
The time domain data of two SC-FDMA symbols, by FFT (Fast Fourier Transformation, fast Fourier transform)
Change to frequency domain, find the frequency domain data of the two symbol according to resource mapping position.
Step 2: detect first SC-FDMA symbol and the dependency of second SC-FDMA symbol, see if there is relevant peaks
Value.If without peak value, being then judged to PUCCH format 3, detection terminates；Otherwise perform step 3.
Step 3: compare the size of the real part imaginary part modulus value of correlation peak, if the two difference is relatively big, is then PUCCH format 1/1a/1b；
If the two sizableness, then it it is PUCCH format 2/2a/2b.
It is an advantage of the current invention that:
1. desired parameters is few, can carry out blind check.The present invention has only to provide PUCCH carrying out PUCCH format blind check when
The physical resource that data are used, i.e. subframe numbers and frequency domain RB (Resource Block, resource element block) position.
2. operand is little, it is only necessary to twice FFT computing and the circulation computing cross-correlation of 12, wherein circulates computing cross-correlation
Operand can also be reduced further by the equivalence of circulation cross-correlation with cyclic convolution.
Accompanying drawing explanation
Fig. 1 is LTE/LTE-A spatial structure schematic diagram of the prior art；
Fig. 2 is PUCCH format 1/1a/1b processing method schematic diagram under common CP；
Fig. 3 be PUCCH format 1/1a/1b under common CP, transmit simultaneously SRS (Sounding Reference Signal,
Detection reference signal) time processing method schematic diagram；
Fig. 4 is PUCCH format 2/2a/2b processing method schematic diagram under common CP；
Fig. 5 is the PUCCH format 3 processing method schematic diagram under common CP；
Fig. 6 is the method schematic diagram that PUCCH is mapped to physical resource；
Fig. 7 is the method flow diagram of PUCCH format blind check.
Detailed description of the invention
The method of the PUCCH format blind check described in the present invention processes in numeric field base band, therefore processed source
Data should be signal after baseband sampling, if sample rate is 30.72MHz.
For the ease of understanding the feasibility of the blind detection method proposed in the present invention, before explanation detailed embodiment, it is situated between the most in detail
Continue the generation method of the PUCCH signal of each form.
1.PUCCH form 1/1a/1b
Fig. 2 depicts PUCCH format 1/1a/1b use common CP time, the processing method in a time slot.Permissible
Find out in 7 SC-FDMA symbols in a time slot, keep to the side on 4 be the symbol of carrying information, middle 3 are
The symbol of carrying DM-RS (demodulation reference signal, demodulated reference signal).Under extension CP, have 6
Individual SC-FDMA symbol, wherein middle 2 are used for carrying DM-RS, and 4 of outside are used for carrying information, remaining process side
Method is similar, the most no longer illustrates with extra figure.
When using PUCCH format 1, the clearest and the most definite bit information is transmitted, but only has a dispatch request,
It is mapped as complex symbol d after a modulation0=1.When using PUCCH format 1a when, need to transmit the letter of 1 bit
Breath (uses b to represent), and this bit information passes through BPSK (Binary Phase Shift Keying, binary phase shift keying)
Modulation system be mapped as d0.The mapping situation such as table 2 below of BPSK.
The mapping situation of table 2 BPSK
In time using PUCCH format 1b, needing to transmit the information of 2 bits, this bit information passes through QPSK
The modulation system of (Quadrature Phase Shift Keying, QPSK) is mapped as d0.The mapping situation of QPSK is such as
Table 3 below.
The mapping situation of table 3 QPSK
Symbol d after ovennodulation0(QPSK sequence here has good from phase to be multiplied by the QPSK sequence of a length of 12
Close characteristic), obtain a sequence carrying a length of the 12 of informationThis sequenceIt is further mapped to each hold
The when of on the SC-FDMA symbol of information carrying breath, experienced by different phase place rotation alphai, result carries information at each
Data on SC-FDMA symbol areEachThrough different mask bit wiProcess, eventually pass
FFT changes to time domain, adds CP, adds that the frequency shift (FS) of half subcarrier finally gives the time domain data of a subframe.The most special
If transmit SRS in present sub-frame simultaneously, it will take last SC-FDMA symbol of this subframe, now
PUCCH is referred to as " PUCCH of shortening ".Unlike common situation, in the time slot having SRS, carry information
SC-FDMA symbol only have 3 (common CP) or 2 (extension CP), as shown in Figure 3.Remaining processing method with
Narration above is just the same.
Carrying DM-RS SC-FDMA symbol generations process with carry information SC-FDMA symbol generation process some
Similar, but the former is simpler than the latter.Owing to being carrying reference signal, the most original data are exactly non-modulated symbol
The QPSK sequence used in the QPSK sequence of weighting, and the SC-FDMA symbol of this QPSK sequence and carrying information
It is sameAfterwards on different SC-FDMA symbolsCarry out different phase place rotation alphaiObtainHere
αiComputational methods are identical with the computational methods in the SC-FDMA symbol of carrying information.It is then passed through different mask bit wiEnter
Row processes, then changes to time domain through FFT, adds CP, add the frequency shift (FS) of half subcarrier finally give a subframe time
Numeric field data.
So far, the PUCCH format 1/1a/1b signal in a time slot is generated as.Signal in second time slot is to repeat
In first time slot on the basis of signal, add the phase shift of pi/2.Phase place rotation alphaiValue be by high-rise parameter WithPassing through the calculated of complexity, concrete computational methods are referred to 3GPP (3rd Generation
Partnership Project, third generation partner program) description of 5.4.1 joint in the standard 136211 issued.PUCCH
The physical resource used also is by high-rise parameterWithPass through the calculated of complexity, concrete
The description of the 5.4.3 joint that computational methods are referred in the standard 136211 that 3GPP issues.The SC-FDMA of carrying DM-RS
The mask code sequence that the SC-FDMA symbol of symbol and carrying information uses respectively can be from the standard 136211 that 3GPP issues
Table 5.4.1-2 and table 5.4.1-3 in obtain.
2.PUCCH form 2/2a/2b
Fig. 4 depicts PUCCH format 2/2a/2b processing method in common CP next one time slot.Can be seen that one
In individual time slot second in 7 SC-FDMA symbols and penultimate are the SC-FDMA symbols of carrying DM-RS,
Remaining 5 is the SC-FDMA symbol of carrying information.Under extension CP, have 6 SC-FDMA symbols, Qi Zhongzheng
Several 4th symbols (the 3rd symbol reciprocal) are used for carrying DM-RS, and remaining 5 are used for carrying information, and its processing method is
It is similar to, the most no longer illustrates with extra figure.
The preparation method of the SC-FDMA symbol of carrying information is the most similar to the description in PUCCH format 1/1a/1b, difference
It is that the preliminary treatment method of raw information is different.In form 2/2a/2b, the raw information as input has 20 bits, if
For b (0) ..., (form 2a has 21 bits, form 2b to have 22 bits to b (19) in fact, but unnecessary 1 or 2 bits are not
As input here, but as generating the parameter of DM-RS, this will explain in detail below).B (0) ..., b (19) is first
Carry out scrambler by a pseudo-random sequence, obtain data after scramblerCarry out QPSK afterwards and modulate generation 10
Symbol d (0) after individual modulation ..., d (9), the mapping mode of QPSK modulation here is identical with form 1/1a/1b.Above
It has been mentioned that have 5 SC-FDMA symbols in each time slot for carrying information, these ten modulation symbols are loaded into two the most respectively
On these 10 SC-FDMA symbols in individual time slot, the most each SC-FDMA symbol carries different information.In Fig. 4
D (0) ..., d (4) is front 5 modulation symbols.Processing method afterwards is identical with the description in form 1/1a/1b, no
Repeat again.It addition, PUCCH format 2/2a/2b does not haves situation about transmitting with SRS simultaneously.
The DM-RS of the DM-RS of PUCCH format 2/2a/2b and form 1/1a/1b generates that method is substantially similar (can also be from
Fig. 4 finds out), but have extra process (extra process embodies the most in the diagram).As said before, form 2a
Can carry the information of 21 bits, form 2b can carry the information of 22 bits, bit information b (20) or b (20) b (21) can be by pressing
Carry out BPSK or QPSK modulation according to table 4 below and obtain modulation symbol d (10).
Table 4 BPSK or QPSK modulates the modulation symbol d (10) obtained
It is similar to the DM-RS of form 1/1a/1b, first can generate the QPSK sequence of a length of 12, and this QPSK
Sequence is same with the QPSK sequence of use in the SC-FDMA symbol of carrying informationAs the DM-RS sending form 2
Time, the QPSK sequence of generationIt is used directly to use.And when generating the DM-RS of form 2a/2b, the QPSK of generation
SequenceThe SC-FDMA symbol of second carrying DM-RS in over each slot can be weighted by d (10), then carries out follow-up
Process.Change angle to understand, it is also possible to think and form 2 there is also d (10), and d (10)=1.When CP type is for expanding
During exhibition CP, in each time slot, only one of which SC-FDMA symbol to be used for carrying DM-RS, and this uniquely carries DM-RS
SC-FDMA symbol clearly cannot be used for transmit d (10), therefore form 2a/2b is not used in the transmission of extended cyclic prefix.After
It is identical that continuous operation generates process with the DM-RS of form 1/1a/1b, repeats no more.
3.PUCCH form 3
Fig. 5 is the processing mode of form 3, it can be seen that the distribution of its resource is the same with form 2/2a/2b, in other words exists
Under general cyclic prefix, second in 7 SC-FDMA symbols in a time slot and penultimate are carrying DM-RS
Symbol, remaining 5 is the symbol of carrying information.But both data mapping modes have the biggest difference.At extension CP
Under, have 6 SC-FDMA symbols, wherein the 4th symbol of positive number (the 3rd symbol reciprocal) is used for carrying DM-RS,
Remaining 5 are used for carrying information.
In form 3, the raw information as input has 48 bits, is set to b (0) ..., b (47).These bit informations are the most logical
Cross a pseudo-random sequence and carry out scrambler, obtain data after scramblerCarry out QPSK afterwards and modulate generation 24
Symbol d (0) after individual modulation ..., d (23).After these 24 modulation, symbol can be two groups with 12 components, is respectively mapped to two
On time slot.And over each slot, 12 modulation symbols comprise complete in the SC-FDMA symbol of each carrying information
Portion, this is one of difference with form 2/2a/2b.As a example by the process of first time slot, front 12 modulation symbols
D (0) ..., d (11) is replicated to five parts, one SC-FDMA symbol of every part of correspondence, respectively through different cyclic shifts, is subject to
Not coordination to mask code sequence is weighted, then via DFT (Discrete Fourier Transform, discrete Fourier transform)
Change to time domain with IFFT, add CP, add that the frequency shift (FS) of half subcarrier finally gives the time domain data of a subframe.Second
The process of individual time slot is identical with first time slot flow process, and only raw information becomes d (12) ..., d (23).With form 1/1a/1b
Identical, when transformat 3, if transmit SRS signal in present sub-frame simultaneously, it will take last of this subframe
SC-FDMA symbol, PUCCH now is referred to as " PUCCH of shortening ".In the time slot having SRS, carry information
SC-FDMA symbol only have 4 (common CP) or 3 (extension CP).
The SC-FDMA symbol creation method carrying DM-RS in form 3 is basically identical with the product process in form 1/1a/1b,
Simply the computational methods of parameter are different.
Next the method that PUCCH is mapped to physical resource is introduced again.
The physical resource that one PUCCH takies is fixing, and specifically its size is 2, when i.e. taking 2 in time domain
Gap (subframe, altogether 1ms), frequency domain takies 12 subcarriers.But the when of being mapped on physical resource, not
Use continuous print resource, but the method that have employed frequency hopping.
The typical mapping method of PUCCH physical resource as shown in Figure 6, whereinThe bandwidth distributed by up-link, unit
It is RB.M is the numbering of PUCCH.It is laterally time orientation, is longitudinally frequency direction.It will be seen that to numbered m=0
PUCCH for, it occupies a minimum RB of frequency and the highest RB of frequency respectively at two time slots；To volume
For number being the PUCCH of 1, it occupies a highest RB of frequency and the minimum RB of frequency respectively at two time slots.
Two PUCCH of numbered 2 and numbered 3 occupy the one of surplus resources medium frequency minimum (high) respectively at two time slots
An individual RB and RB of frequency the highest (low).It is to say, when PUCCH is mapped to physical resource when, in time domain
The upper length necessarily taking a subframe, can occupy in uplink bandwidth surplus resources the frequency resource on limit on frequency domain.
Under different bandwidth, the frequency domain resource position that PUCCH can take is different.Table 5 below gives under different bandwidth,
The edge RB number that PUCCH may take.
The edge RB number that under table 5 different bandwidth, PUCCH may take
Such as overall system a width of 100RB when, may take No. RB of PUCCH is 0～15 and 84～99.
When transmitting PUCCH format 1/1a/1b and form 3 when, it may appear that present sub-frame scheduled SRS transmission simultaneously
Situation, now can transmit one " PUCCH of shortening ", i.e. last SC-FDMA of subframe as be previously noted
Symbol is not used in transmission PUCCH.And PUCCH format 2/2a/2b does not has " shortening " pattern, therefore can keep away when scheduling
Exempt to use PUCCH format 2/2a/2b in the subframe having SRS to dispatch.
The method of up PUCCH channel format blind check in the LTE lte-a system that the present invention provides, processed source data is
Signal after baseband sampling, if sample rate is 30.72MHz.Flow process as shown in Figure 7, specifically includes following steps:
Step 1, time-frequency resource allocating according to PUCCH, take out first of the PUCCH data place needing detection and the
The time domain data of two SC-FDMA symbols, changes to frequency domain by FFT, finds the two symbol according to resource mapping position
Frequency domain data.
After obtaining the base band time domain sampled data of a subframe, first have to sampled data is split, obtain each
The time domain data of SC-FDMA symbol.Specifically, segmentation is by CP type decided.In the case of common CP, often
The CP a length of 160 of first SC-FDMA symbol of individual time slot, the CP a length of 144 of remaining symbol；At extension CP
In the case of, the CP length of each SC-FMDA symbol is 512.It addition, before transforming to frequency domain, be by each
CP in SC-FDMA symbol removes.The most whatsoever CP type, is left 2048 in each SC-FDMA symbol
Point data, implements FFT to it.Owing to step 2 and step 3 all have only to enter first and second SC-FDMA symbol
Row processes, and therefore has only to the time domain data of first and second SC-FDMA symbol is changed to frequency domain.From the two
In SC-FDMA symbol, the sequence of a length of 12 can be obtained.
Frequency domain intercepts PUCCH data when, it is thus necessary to determine that the position of the frequency domain resource shared by PUCCH.As above
Described, this position is to pass through higher level parametersWithIndicate.When receiving terminal knows these higher level parameters
Value when (base station is the value knowing these parameters naturally in systems in practice, and should at " signal analyzer " etc.
In with, these parameters can be allocated to instrument), it is possible to calculate numbering m of the PUCCH needing demodulation, and then know shared by it
The position of frequency domain resource.When receiving terminal does not knows these higher level parameters when, it is necessary in current time slots, travel through institute
Having the frequency domain position that PUCCH may take, (frequency hopping relation is referred to as a pair as elucidated before) is detected by RB one by one.
As previously described, under different bandwidth situation, the bandwidth range of detection is also different.
Step 2, first SC-FDMA symbol of detection and the dependency of second SC-FDMA symbol, see if there is relevant peaks
Value.If without correlation peak, being then judged to PUCCH format 3, detection terminates.Otherwise perform step 3.
The detection method of described dependency is: use the data sequence of first SC-FDMA symbol and second respectively
The complex conjugate of the data sequence of SC-FDMA symbol, the corresponding position of the two is multiplied, then the data after being multiplied is carried out IFFT
(Inverse Fast Fourier Transformation, inverse fast fourier transform), is referred to as IFFT sequence by the sequence after IFFT.
The relatively maximum in this IFFT sequence and meansigma methods, if being considered as the when that the two ratio being more than a threshold value there is a phase
Close peak value, otherwise then not think and exist.Threshold value can choose suitable value the most voluntarily.
For form 1/1a/1b and the PUCCH of form 2/2a/2b, the data on each SC-FDMA symbol are all based on one
The QPSK sequence of individual a length of 12, therefore the data sequence on first and second SC-FDMA symbol is circulated mutually
Time relevant, a correlation peak will necessarily occur；And form 3 only DM-RS is based on QPSK sequence, remainder data part is also
Being not based on QPSK sequence, therefore the data on its first two SC-FDMA symbol are mutually independent, circular correlation will not go out
Existing correlation peak.
Therefore, the frequency domain data of two the SC-FDMA symbols obtained in step 1 is circulated cross-correlation, according to whether have
Correlation peak may determine that whether be form 3.
Step 3, compare the size of the real part imaginary part modulus value of correlation peak, if the two difference is relatively big, be then form 1/1a/1b；If
The two sizableness, then be form 2/2a/2b.
If occurring in that correlation peak in the result of circulation cross-correlation, then explanation is form 1/1a/1b or form 2/2a/2b.As above
Described, in form 1/1a/1b, the first two SC-FDMA symbol all carries identical information, does not the most consider influence of noise
Time, correlation peak is a real number (modulation symbol and its conjugate multiplication).Even if consideration effect of noise, the reality of correlation peak
The modulus value in portion is also much larger than imaginary part.
And in form 2/2a/2b, the information of first SC-FDMA symbols carry QPSK modulation, real part and imaginary part modulus value
Size is identical；Second SC-FDMA symbols carry DM-RS, is equivalent to the modulation symbol that the information that carries is 1+0j.
Therefore, during noiseless, the real part of the correlation peak of the two and the modulus value of imaginary part are equal.Even if consideration effect of noise, phase
Close the real part of peak value and the modulus value size also approximately equal of imaginary part.
Therefore, by the real part of the correlation peak obtained in step 2 and the modulus value of imaginary part are compared, it is possible to judge be
Form 1/1a/1b or form 2/2a/2b, completes detection.Specifically, if the modulus value of the real part of correlation peak and imaginary part is distinguished
For R and I.IfThen it is considered form 1/1a/1b, otherwise it is assumed that be form 2/2a/2b.
Claims (4)
- The method of up PUCCH channel format blind check in 1.LTE/LTE-A system, it is characterised in that:Step 1: according to the time-frequency resource allocating of PUCCH, takes out first of the PUCCH data place needing detection and the The time domain data of two SC-FDMA symbols, changes to frequency domain by FFT, finds the two symbol according to resource mapping position Frequency domain data；Step 2: detect first SC-FDMA symbol and the dependency of second SC-FDMA symbol, see if there is relevant peaks Value；If without peak value, being then judged to PUCCH format 3, detection terminates；Otherwise perform step 3；Step 3: compare the size of the real part imaginary part modulus value of correlation peak, if the modulus value of the real part of correlation peak and imaginary part is respectively R And I, ifThen it is considered form 1/1a/1b, otherwise it is assumed that be form 2/2a/2b.
- The method of up PUCCH channel format blind check in LTE/LTE-A system the most according to claim 1, it is characterised in that: The source data that described method is processed is signal after baseband sampling, if sample rate is 30.72MHz.
- The method of up PUCCH channel format blind check in LTE/LTE-A system the most according to claim 1, it is characterised in that: Described change to frequency domain by FFT before, the CP in each SC-FDMA symbol be removed, each SC-FDMA accords with 2048 point data all it are left in number.
- The method of up PUCCH channel format blind check in LTE/LTE-A system the most according to claim 1, it is characterised in that: The detection method of described dependency is: use the data sequence of first SC-FDMA symbol and second SC-FDMA respectively The complex conjugate of the data sequence of symbol, the corresponding position of the two is multiplied, then the data after being multiplied is carried out IFFT, obtains IFFT sequence Row；The relatively maximum in this IFFT sequence and meansigma methods, if being considered as having one when that the two ratio being more than a threshold value Individual correlation peak, on the contrary then not think and exist.
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| CN110944380A (en) * | 2019-10-30 | 2020-03-31 | 上海无线通信研究中心 | MIMO parallel channel detection device and method for millimeter wave communication |
| CN112532370A (en) * | 2021-02-09 | 2021-03-19 | 广州慧睿思通科技股份有限公司 | PUCCH information detection method, device, electronic equipment and computer-readable storage medium |
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