CN106230551B - Produce the interleave unit and wireless communication data transmission, reception device of pilot tone - Google Patents
Produce the interleave unit and wireless communication data transmission, reception device of pilot tone Download PDFInfo
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- CN106230551B CN106230551B CN201610592999.2A CN201610592999A CN106230551B CN 106230551 B CN106230551 B CN 106230551B CN 201610592999 A CN201610592999 A CN 201610592999A CN 106230551 B CN106230551 B CN 106230551B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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Abstract
The invention discloses a kind of interleave units of producible pilot tone, belong to wireless communication technology field.Comprising: one group of parallel interleaver, for being interleaved processing respectively to input block；One selector, the interleaving data for being exported according to each interleaver obtain the final output of interleave unit: the interleaving data exported to each interleaver, are constituted the imaginary pilot tone for arranging isometric with default pilot tone arrangement wherein to fix the data of position；It is selected to fabricate pilot tone arrangement and the identical interleaver of default pilot tone arrangement, and using the interleaving data of the interleaver as final output；It arranges most like interleaver if it is not, it is selected to fabricate pilot tone arrangement with default pilot tone, and as final output after use default pilot tone arrangement to replace the imaginary pilot tone arrangement in the interleaving data of the interleaver.The invention also discloses a kind of wireless communication data sending devices, reception device.The present invention can realize pilot-symbol aided channel estimation in the case where not needing pilot-frequency expense.
Description
Technical field
The present invention relates to wireless communication technology field more particularly to a kind of interleave units of producible pilot tone.
Background technique
Orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) is as current
And the core technology of future wireless system, the multipath effect being effective against in radio transmission, simplify balanced device design, reduction connects
Receipts machine complexity and power consumption improve the availability of frequency spectrum.
Key link one of of the channel estimation (Channel Estimation) as ofdm system passes through signal transmission
The parameters such as time delay, decaying, the multipath of the wireless channel gone through are estimated；The order of accuarcy of channel estimation, to channel equalization, solution
Tune, decoding and transmitting terminal precoding etc. have direct influence.
Existing channel estimation technique is broadly divided into blind Channel Estimation (Blind Channel Estimation) and pilot tone
Assisted channel estimation (Pilot Assisted Channel Estimation) two major classes.The former does not use pilot tone, utilizes transmission
Some characteristics of data itself estimate that channel, since it does not have pilot-frequency expense, the availability of frequency spectrum is higher, but its operation is multiple
Miscellaneous degree is very considerable, and estimation needs more data to participate in every time, and real-time is poor, therefore seldom adopts in practical communication system
With.The latter by being inserted into frequency pilot sign known to sending and receiving end within the data block, and receiving end is using the frequency pilot sign received and
The pilot symbol transmitted known is based on least square (Least Squares, LS) or least mean-square error (Minimum Mean
Square Error, MMSE) etc. criterion wireless channel is estimated, but use pilot tone after reduce data transmission speed
Rate；To reduce pilot-frequency expense, the availability of frequency spectrum is improved, the sparsity of wireless channel can be sufficiently excavated, utilize compressed sensing
(Compressed Sensing) technology carries out sparse reconstruction, implements condition of sparse channel and estimates (Sparse Channel
Estimation).But no matter which kind of existing pilot-symbol aided channel estimation method is used, require to carry out pilot tone in data sending terminal
The insertion of symbol needs additionally to occupy valuable frequency spectrum resource.
When wireless channel is more severe, the deep fade of last longer will cause transmission data and continuous bunchiness occurs
Mistake, cause receiving end channel decoding can not error correction after transmitting terminal constellation point, a sub-symbol friendship therefore can be carried out
(Symbol Interleaving) is knitted, is reset to symbol is sent, thus by the mistake discretization of continuous bunchiness, randomization,
Enable the effective error correction of receiving end channel decoding.
In the prior art, it is inserted into pilot tone and symbol interleaving both operations often uses simultaneously, but usually two independences
The step of, and also need additionally to occupy frequency spectrum resource (pilot-frequency expense).
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and to provide a kind of intertextures of producible pilot tone
Unit can generate pilot tone in the fixation position in interleaving data while being interleaved processing to data, so as to be not required to
In the case where wanting pilot-frequency expense, pilot-symbol aided channel estimation is realized.
The invention adopts the following technical scheme:
A kind of interleave unit of producible pilot tone, comprising:
One group of parallel interleaver, for being interleaved processing respectively to input block；
One selector, the interleaving data for being exported according to each interleaver obtain the final output of interleave unit, tool
Body method is as follows: the interleaving data exported to each interleaver, is constituted and default pilot tone with wherein fixing the data of position
The imaginary pilot tone arrangement for arranging isometric；It is selected to fabricate pilot tone arrangement identical friendship with the arrangement of default pilot tone from all interleavers
Device is knitted, and using the interleaving data of the interleaver as final output；If without such interleaver, from all interleavers
It selects it to fabricate pilot tone arrangement to arrange most like interleaver with default pilot tone, and is arranged with default pilot tone by the friendship of the interleaver
Final output is used as after imaginary pilot tone arrangement replacement in organization data.
Following technical scheme can also be obtained according to above-mentioned interleave unit:
A kind of wireless communication data sending device successively includes: that the addition of CRC check position is single according to the flow direction of data to be sent
Member, channel encoding unit, constellation point unit, interleave unit, subcarrier mapping unit, IFFT unit, protection interval insertion
Unit, upconverting unit；The interleave unit is that the interleave unit of pilot tone is produced described in above technical scheme.
Preferably, the number K of the parallel interleaver in the interleave unit meets following formula:
Wherein, Q indicates the order of constellation point unit,Floor operation in expression, d indicate the length of default pilot tone arrangement
Degree,For preset expected probit.
A kind of wireless communication data reception device, the data sent for receiving any of the above-described technical solution described device；
Flow direction according to received data successively includes: down-converter unit, protection interval removal unit, FFT unit, subcarrier demapping
Unit, channel equalization unit, deinterleaves unit, constellation point de-mapping unit, channel decoding unit, the school CRC at channel estimating unit
Verification certificate member, selecting unit；The channel estimating unit is arranged according to the default pilot tone first, from subcarrier de-mapping unit
Output data extracts the pilot tone arrangement received, then carries out letter using the pilot tone arrangement and the default pilot tone arrangement that receive
Road estimation；The deinterleaving unit includes one group of parallel deinterleaver, is corresponded with the interleaver in the interleave unit；
Constellation point de-mapping unit, channel decoding unit, CRC check unit are respectively included with the deinterleaver in deinterleaving unit one by one
Corresponding one group parallel constellation point de-mapping device, channel decoder, CRC check device, each deinterleaver and its corresponding to
Constellation point de-mapping device, channel decoder, CRC check device constitute a branch；The selecting unit from each branch for selecting
The data for selecting the correct branch of CRC check are exported.
In order to reduce the quantity of interleaver used in data sending device, be based on identical invention thinking, the present invention into
One step proposes one group of technical solution below:
A kind of interleave unit of producible pilot tone, comprising:
Data grouping module, for input block to be divided into G data sub-block；
G parallel parallel interleaver groups, correspond with the G data sub-block；Each parallel interleaver group includes
One group of parallel interleaver and a selector；One group of parallel interleaver is used for parallel interleaver where inputting it
The data sub-block of group is interleaved processing respectively；The selector is used for according to each interleaver institute in parallel interleaver group where it
The interleaving data of output obtains the final output of the parallel interleaver group, and the specific method is as follows: being exported to each interleaver
Interleaving data, with wherein fix position data is constituted with default pilot tone corresponding to the parallel interleaver group arrangement it is isometric
Imaginary pilot tone arrangement；It selects it to fabricate the arrangement of pilot tone from all interleavers of the parallel interleaver group to preset with described
The identical interleaver of pilot tone arrangement, and using the interleaving data of the interleaver as the output of place parallel interleaver group；If
There is no such interleaver, then selects it to fabricate the arrangement of pilot tone from all interleavers of the parallel interleaver group and led with default
The most like interleaver of frequency arrangement, and arranged imaginary pilot tone in the interleaving data of the interleaver with default pilot tone arrangement
Output after cloth replacement as place parallel interleaver group；The default pilot tone arrangement is preset by the following method: will
Default pilot tone arrangement is divided into one-to-one G default pilot tone of the parallel interleaver group parallel with the G and arranges；
Data combination module is combined for the G output to the G parallel interleaver group, obtains interleave unit
Final output.
A kind of wireless communication data sending device successively includes: that the addition of CRC check position is single according to the flow direction of data to be sent
Member, channel encoding unit, constellation point unit, interleave unit, subcarrier mapping unit, IFFT unit, protection interval insertion
Unit, upconverting unit；The interleave unit is that the interleave unit of pilot tone is produced described in above technical scheme.
Preferably, the number k of the interleaver in the interleave unit in j-th of parallel interleaver groupjMeet following formula:
Wherein, Q indicates the order of constellation point unit,Floor operation in expression, djIndicate j-th of default pilot tone
The length of arrangement,For preset probability value, j=1,2 ..., G.
A kind of wireless communication data reception device, for receiving the data of any of the above technical solution described device transmission；
Flow direction according to received data successively includes: down-converter unit, protection interval removal unit, FFT unit, subcarrier demapping
Unit, channel equalization unit, data packet units, deinterleaves unit, data arrangement unit, constellation point solution at channel estimating unit
Map unit, channel decoding unit, CRC check unit, selecting unit；The channel estimating unit is led according to described preset first
Frequency is arranged, and the pilot tone arrangement received is extracted from the output data of subcarrier de-mapping unit, then utilizes the pilot tone received
Arrangement and the default pilot tone arrangement carry out channel estimation；The data packet units are used for according to data grouping in interleave unit
The data that the mode of module exports channel equalization unit are grouped；The unit that deinterleaves includes G parallel parallel solutions
G parallel interleaver group in interleaver group, with the interleave unit corresponds, each parallel deinterleaver group include with it is right
Answer the one-to-one one group of parallel deinterleaver of the interleaver in parallel interleaver group；Data arrangement unit is used for G simultaneously
The output of row deinterleaver group is spliced, and is obtainedKind data combination, kiIndicate i-th of parallel deinterleaver group
In deinterleaver quantity；Constellation point de-mapping unit, channel decoding unit, CRC check unit respectively include and the N kind number
According to the one-to-one parallel N number of constellation point de-mapping device of combination, N number of channel decoder, N number of CRC check device, every kind of data group
Close the branch that output to its corresponding constellation point de-mapping device, channel decoder, CRC check device is constituted；The selection is single
Member from each branch for selecting the data of the correct branch of CRC check to be exported.
Between above-mentioned imaginary pilot tone arrangement and the arrangement of default pilot tone and the arrangement of imaginary pilot tone is arranged with default pilot tone
Between similitude existing various similarity measurements can be used, present invention preferably uses Euclidean distance or standard Euclidean away from
From or manhatton distance, apart from smaller, similitude is bigger.
Compared with prior art, the invention has the following advantages:
The present invention generates pilot tone using data interlacing, it is entirely avoided pilot-frequency expense improves the availability of frequency spectrum, and channel
Estimate that performance and existing pilot-symbol aided channel estimation performance are close.
The present invention further uses block interleaved technology during generating pilot tone using data interlacing, effectively reduces hair
The parallel interleaver number of sending end, reduces the complexity of transmitting terminal, is particularly suitable for mobile terminal when uplink communication and is used as hair
The scene of sending end.
Detailed description of the invention
Fig. 1 is the system block diagram of wireless communication system one embodiment of the present invention.
Fig. 2 is the system BLER performance pair that the present invention uses LS channel estimation with existing insertion pilot schemes
Than.
Fig. 3 is the system BLER performance comparison that the present invention is estimated using LS channel estimation and condition of sparse channel respectively.
Fig. 4 is the system block diagram of another embodiment of wireless communication system of the present invention.
Fig. 5 is parallel interleaver group structure chart.
Fig. 6 is parallel deinterleaver group structure chart.
Fig. 7 is the system BLER that grouping scheme of the present invention and the present invention use LS channel estimation regardless of group scheme
Performance comparison.
Fig. 8 is the system BLER that grouping scheme of the present invention uses LS channel estimation and condition of sparse channel to estimate respectively
It can comparison.
Specific embodiment
Embodiment one
Wireless communication system in the present embodiment as shown in Figure 1, the binary data blocks of transmitting terminal to pass through circulation first superfluous
Redundancy checksum (Cyclic Redundancy Check, CRC) unit, passes sequentially through channel encoding unit, channel coding star later
Seat point map unit, interleave unit, subcarrier mapping unit, inverse fast fourier transform (Inverse Fast Fourier
Transform, IFFT) unit, protection interval unit and upconverting unit, it is emitted into wireless channel.Wherein, interleave unit by
K parallel interleaver and a selector cascade are constituted, as shown in Figure 1.
The data block that receiving end receives passes sequentially through down-converter unit, removal protection interval unit, Fast Fourier Transform
(Fast Fourier Transform, FFT) unit, subcarrier de-mapping unit, channel estimating unit, channel equalization unit,
Unit, constellation point de-mapping unit, channel decoding unit, CRC check unit and selecting unit are deinterleaved, final output is obtained.
When CRC check failure, retransmission request is sent.Wherein, it deinterleaves unit to be made of K parallel deinterleaver, such as Fig. 1 institute
Show.
Compared with existing ofdm system, the present invention is in transmitting terminal using interleave unit instead of the list of existing ofdm system
A interleaver and insertion pilot operation；The present invention uses deinterleaving unit, constellation point de-mapping unit, channel decoding in receiving end
Unit, CRC check unit and selector unit are reflected instead of the single deinterleaver of existing ofdm system, single constellation point solution
It penetrates, individual channel decoding, single CRC check.
For the present invention before carrying out data transmission, sending and receiving end agreement uses the default pilot tone arrangement p that length is d.In transmitting terminal
After constellation point, it is assumed that generate the data block s that a length is M.Assuming that interleave unit uses K parallel interleaver,
The output of k-th of interleaver is denoted as In data on d given position to constitute a length be d
Imaginary pilot tone arrangement, be denoted asSelector one by one arrange by relatively more default arrangement p and K imaginary pilot tone of pilot toneTherefrom chooseWherein k0Meet
In above formula,Indicate l2Norm,Euclidean distance for sequence of calculation a and sequence b.When (1) exists
When multiple solutions, optionally one of them.IfThen directly exportIf Then will
It is exported after replacing with p
There are some imaginary pilot tone arrangement is identical (i.e. as default pilot tone arrangement in all data blocks of definition transmission) probability beThen corresponding interleaver numbers K needs to meet
Wherein, Q indicates the order of constellation point, Q=2 when for example, by using BPSK, using Q=4 when QPSK.In expression
Floor operation.It is higher when Q and d are remained unchangedIt will lead to bigger K, i.e., thus more interleavers will be improved and be received and dispatched
The complexity at end.?When remaining unchanged, when Q or d increases, it is also desirable to which thus bigger K will also improve the complexity of sending and receiving end
Degree.
The output of interleave unit passes sequentially through subcarrier mapping unit, IFFT unit, and by being inserted into protection interval unit,
Enter wireless channel after upconverting unit.
If channel impulse response is sequences h=[h of length L1, h2..., hL].Receiving end signal passes sequentially through down coversion
After unit, removal protection interval unit, FFT unit, subcarrier de-mapping unit, y is obtained.Data of the y on d given position
Constitute sequences y(d).Utilize y(d)Channel estimation is carried out with p, including is estimated using existing LS channel estimation and condition of sparse channel
The methods of meter.Channel equalization is carried out using channel estimation results later, is obtainedIt willInput is by K parallel deinterleaver structures
At deinterleaving unit, wherein each deinterleaver corresponds respectively to an interleaver of transmitting terminal.K are passed sequentially through later simultaneously
Capable constellation point device, K parallel channel decoders, K parallel CRC check devices.Select the correct result of CRC check
As final output, if CRC check all mistake, sends transmission instruction again to transmitting terminal.
For using the Turbo channel coding of 16 CRC, 1/3 code rate and BPSK modulation (Q=2).Each data block warp
Crossing the later length of channel coding is M=348.Sending and receiving end agreement using length be d=6 preset pilot tone arrange p=[1,1,1,1,
1,1].Probability is setAccording to formula (2), parallel interleaver module at least needs 147 parallel interleavers.K-th
The output of interleaver is denoted asFor LS channel estimation, the prior art indicate that equally spaced pilot tone
It arranges optimal, therefore places a frequency pilot sign, given position I every 58 data symbolsp=[30,88,146,204,
262,320].In IpOn data constitute the subsequence that length is 6, that is, fabricate pilot tone arrangement, be denoted asSelector
Relatively more default pilot tone arrangement p and 147 imaginary pilot tone arrangement one by oneTherefrom chooseOutput, wherein
k0Meet
When (3) are there are when multiple solutions, optionally one of them.IfThen directly exportIfThen willIt is exported after replacing with p
It is rightSubcarrier mapping unit, IFFT unit are passed sequentially through, and by insertion protection interval unit and up-conversion list
Enter wireless channel after member.If channel impulse response is sequences h=[h of length L=61, h2..., h6].Receiving end signal according to
It is secondary by down-converter unit, removal protection interval unit, FFT unit, after subcarrier de-mapping unit, obtain y.Y is in IpOn
Data constitute sequences y(6).Utilize y(6)LS channel estimation is carried out with p.It is equal that channel is carried out using channel estimation results later
Weighing apparatus, obtainsIt willThe deinterleaving unit being made of 147 parallel deinterleavers is inputted, wherein each deinterleaver is right respectively
It should be in an interleaver of transmitting terminal.147 parallel constellation point devices are passed sequentially through later, 147 parallel channels are translated
Code device, 147 parallel CRC check devices.Select the correct result of CRC check as final output, if CRC check is wrong in every respect
Accidentally, transmission instruction again is sent to transmitting terminal.Simulation result and existing pilot aided LS channel estimation are carried out pair
Than as shown in Figure 2, wherein the I for the data block that the length that existing channel estimation obtains after channel coding is 348pOn position
Place pilot tone p.As it can be seen that technical solution of the present invention can be obtained in the case where not needing pilot-frequency expense, improving the availability of frequency spectrum
With data block error rate similar in existing pilot aided LS channel estimation (Block Error Rate, BLER) property
Energy.
As shown in figure 3, further compared the emulation that the present invention is estimated using LS channel estimation and condition of sparse channel
As a result.Condition of sparse channel estimation uses orthogonal matching pursuit (Orthogonal Matching Pursuit, OMP) algorithm.Due to dilute
Thin channel estimation can tolerate bigger channel delay, and the length that condition of sparse channel is arranged is L '=11, and wherein nonzero element number is
2.It is I ' using given position of the prior art to the pilot tone that condition of sparse channel is estimatedpIt optimizes, selects I 'p=[30,88,146,
204,262,320].Keep above remaining simulation parameter setting constant.As seen from Figure 5, the present invention is estimated using condition of sparse channel
After technology, bigger channel delay can be tolerated under the default pilot tone arrangement of equal length.
Embodiment two
In example 1, it is noted that formula (2) needs biggish interleaver numbers.ForThe case where, table 1 is given
The required minimum parallel interleaver number K at different default pilot length d and different modulating mode is gone out.
Required minimum parallel interleaver number under table 1, different default pilot tone arrangement length d and different modulating mode
K
As it can be seen that required parallel interleaver number K is also increased rapidly as d increases.On the one hand, multipath number compared with
Under more, the biggish channel circumstance of channel delay, it is larger that the present invention carries out default pilot length d required for channel estimation.It is another
Aspect, in time division duplex (Time-division Duplex, TDD) system, up channel and down channel have reciprocity,
It generallys use uplink channel estimation and obtains channel state information, pilot tone is sent by mobile station when uplink channel estimation, base station carries out
Channel estimation, therefore, it is necessary to reduce the complexity of mobile station to save the electricity of mobile station, it can be parallel by reducing transmitting terminal
The number of interleaver reduces the complexity of mobile station.
This gives a kind of schemes that pilot tone is constituted using packet data intertexture, and it is parallel transmitting terminal can be greatly decreased
The number of interleaver.
As shown in figure 4, the binary data blocks of transmitting terminal pass through cyclic redundancy check (Cyclic first
Redundancy Check, CRC) unit, channel encoding unit, constellation point unit, data grouping mould are passed sequentially through later
Block, G parallel parallel interleaver groups, data combination module, subcarrier mapping unit, IFFT unit, insertion protection interval list
Member and upconverting unit, are emitted into wireless channel.Data grouping module, G parallel parallel interleaver groups, data combination dies
Block together constitutes the interleave unit (i.e. part in dotted line frame in Fig. 4) in the present embodiment, parallel interleaver group structure therein
As shown in figure 5, being made of K parallel interleaver and a selector cascade.
The data block that receiving end receives passes sequentially through down-converter unit, removal protection interval unit, FFT unit, subcarrier
De-mapping unit, channel estimating unit, channel equalization unit, data packet units, G parallel parallel deinterleaver groups obtain
Obtain data arrangement unit, constellation point de-mapping unit, channel decoding unit, NCRC verification unit and the selection of N number of data
Device unit obtains final output.When CRC check failure, retransmission request is sent.Wherein, the structure of parallel deinterleaver group is such as
Shown in Fig. 6, it is made of K parallel deinterleavers.
The present invention is before carrying out data transmission, and sending and receiving end agreement is using the default pilot tone arrangement p that length is d, respectively by i-th
It is d that (i=1,2 ..., G) a parallel interleaver group generates length on given positioni(di> 0) default pilot tone arrange sub-block
pi, and meetBy splicing piObtain p=[p1 p2...pG].After transmitting terminal constellation point, it is assumed that raw
S is divided for G data sub-block s by data grouping module at the data block s that a length is Mi, i=1,2 ..., G, i.e.,
By splicing siS=[s can be obtained1 s2...sG], the length of each data sub-block is mi, andI-th parallel
Interleaver group includes kiA parallel length is miInterleaver, i=1,2 ..., G.Assuming that the total packet of G parallel interleaver group
ContainA interleaver.
T (t=1,2 ..., k of jth (j=1,2 ..., G) a parallel interleaver groupj) output of a interleaver is denoted as In in djIt is d that data on a given position, which constitute a length,jImaginary pilot tone arrange sub-block, be denoted asG
It fabricates pilot tone arrangement sub-block and is spliced to form an imaginary pilot tone arrangement.The selector that the parallel interleaver group includes is relatively more pre- one by one
The sub-block p if pilot tone is arrangedjWith kjA imaginary pilot tone arrangement sub-blockTherefrom chooseWherein t0Meet
When (4) are there are when multiple solutions, optionally one of them.IfThen directly exportIfThen willReplace with pjAfter exportDefinition passes through all data of j-th of parallel interleaver group
Pilot tone arrangement sub-block is fabricated there are some in sub-block and default pilot tone arrangement sub-block is identical (i.e.) probability
ForThen corresponding interleaver numbers kjIt needs to meet
Wherein, Q indicates the order of constellation point.Then exist in all data transmission some fabricate pilot tone arrangement in advance
If the identical probability of pilot tone arrangement p is
Data combination module splices the output of G parallel interleaver group, constitutes the data block that a length is M.
Subcarrier mapping unit, IFFT unit are passed sequentially through later, and enter insertion protection interval unit, it is laggard by upconverting unit
Enter wireless channel.
If channel impulse response is sequences h=[h of length L1, h2..., hL].Receiving end signal passes sequentially through down coversion
After unit, removal protection interval unit, FFT unit, subcarrier de-mapping unit, y is obtained.Data of the y on d given position
Constitute sequences y(d).Utilize y(d)Channel estimation is carried out with p, including using the side such as LS channel estimation and condition of sparse channel estimation
Method.Channel equalization is carried out using channel estimation results later, is obtainedIt, will by data grouping moduleIt is divided into G data
BlockPass through splicingIt is availableEach data sub-blockLength be mi, andRespectively willI-th of parallel deinterleaver group is inputted, wherein each parallel deinterleaver group corresponds respectively to
One parallel interleaver group of transmitting terminal.I-th of parallel deinterleaver group includes kiA parallel length is miDeinterleaver, i
=1,2 ..., G, therefore have kiThe different output of kind, i=1,2 ..., G.Data arrangement unit is by the parallel deinterleaver groups of G
Output splicing, can get altogetherKind data combined result.N number of parallel constellation point is passed sequentially through later
Device, N number of parallel channel decoder, N number of parallel CRC check device.Select the correct result of CRC check as final output,
If CRC check all mistake, transmission instruction again is sent to transmitting terminal.
For using the Turbo channel coding of 16 CRC, 1/3 code rate and BPSK modulation (Q=2).Each data block warp
Crossing the later length of channel coding is M=348.Use G=2 parallel interleaver group.Sending and receiving end agreement is d=6 using length
Default pilot tone arrangement p=[1,1,1,1,1,1], it is d that length is generated on given position by each parallel interleaver group respectively1=
d2=3 default pilot tone arrangement sub-block p1=p2=[1,1,1].It is M=that a length is generated after transmitting terminal constellation point
348 data block s is divided s for G=2 data sub-block s by data grouping modulei, i=1,2, i.e. s=[s1 s2], each
The length of data sub-block is m1=m2=174.Probability is setAccording to formula (6), setting Root
According to formula (5), k is set1=k2=23, i.e., each parallel interleaver group includes the interleaver that 23 parallel length are 174, is amounted to
Include K=46 interleaver.The case where paying particular attention to, not being grouped compared to embodiment one, in identical probability
Under, this embodiment reduces 101 parallel interleavers, save 68.7% parallel interleaver expense, significantly reduce transmission
The complexity at end.
For LS channel estimation, the prior art indicate that the arrangement of equally spaced pilot tone is optimal, therefore every 58 numbers
A frequency pilot sign is placed according to symbol, given position is respectively Ip1=[30,88,146] and Ip2=[30,88,146].Jth (j
=1,2) a parallel interleaver group t (t=1,2 ..., 23) output of a interleaver be denoted as In 3 to positioning
The data set constitute the imaginary pilot tone arrangement sub-block that a length is 3, are denoted as2 imaginary pilot tone arrangement sub-blocks splice structure
At an imaginary pilot tone arrangement.The selector that the parallel interleaver group includes relatively presets pilot tone arrangement sub-block p one by one1=p2=
[1,1,1] and 23 imaginary pilot tones arrangement sub-blocksTherefrom chooseWherein t0Meet
When (7) are there are when multiple solutions, optionally one of them.IfThen directly exportIfThen willReplace with pjAfter export
Data combination module splices the output of 2 parallel interleaver groups, constitutes the number that a length is M=348
According to block.It is I that data, which combine later pilot frequency locations,p=[30,88,146,204,262,320].Subcarrier is passed sequentially through later to reflect
Unit, IFFT unit are penetrated, and enters insertion protection interval unit, wireless channel is entered after upconverting unit.If channel rushes
Swash sequences h=[h that response is length L=61, h2..., h6].Receiving end signal passes sequentially through down-converter unit, removal protection
After spacer units, FFT unit, subcarrier de-mapping unit, y is obtained.Y is in IpOn data constitute sequences y(6).Utilize y(6)And p
Carry out LS channel estimation.Channel equalization is carried out using channel estimation results later, is obtainedBy data packet units,
It willIt is divided into G=2 data sub-blockPass through splicingIt is availableEach data sub-blockLength
Degree is 174.Respectively willInput i-th of parallel deinterleaver group, i=1,2, wherein each parallel deinterleaver group is right respectively
It should be in a parallel interleaver group of transmitting terminal.Each parallel deinterleaver group includes the intertexture that 23 parallel length are 174
Device, therefore have 23 kinds of different outputs.Data arrangement unit splices the output of 2 parallel deinterleaver groups, can get N altogether
=23 × 23=529 kind data combined result.529 parallel constellation point devices, 529 parallel letters are passed sequentially through later
Road decoder, 529 parallel CRC check devices.Select the correct result of CRC check as final output, if CRC check is all
Mistake sends transmission instruction again to transmitting terminal.
Simulation comparison present invention grouping uses the system BLER of LS channel estimation with the present invention regardless of group scheme
Performance, as shown in Figure 7.As it can be seen that the two BLER performance is almost consistent, and uses packet data to interweave and constitute pilot tone in transmission end segment
The parallel interleaver expense for having saved 68.7%, significantly reduces the complexity of transmitting terminal.
As shown in figure 8, further compared grouping scheme of the present invention uses LS channel estimation and sparse letter respectively
The system BLER performance of road estimation.Condition of sparse channel estimation uses OMP algorithm.Since condition of sparse channel estimation can tolerate bigger channel
Time delay, the length that condition of sparse channel is arranged is L '=11, and wherein nonzero element number is 2.Condition of sparse channel is estimated using the prior art
The given position of the pilot tone of meter is I 'pIt optimizes, selects I 'p=[16,46,77,206,269,300].Keep remaining emulation
Parameter setting is constant.As seen from Figure 8, after present invention grouping scheme uses condition of sparse channel estimation technique, in the pre- of equal length
If pilot tone arrangement is lower to tolerate bigger channel delay.
Claims (10)
1. a kind of interleave unit of producible pilot tone characterized by comprising
One group of parallel interleaver, for being interleaved processing respectively to input block；
One selector, the interleaving data for being exported according to each interleaver obtain the final output of interleave unit, specific side
Method is as follows: the interleaving data exported to each interleaver, is constituted and the arrangement of default pilot tone with wherein fixing the data of position
Isometric imaginary pilot tone arrangement；It is selected to fabricate pilot tone arrangement and the identical intertexture of default pilot tone arrangement from all interleavers
Device, and using the interleaving data of the interleaver as final output；If selected from all interleavers without such interleaver
It selects it and fabricates pilot tone arrangement and arrange most like interleaver with default pilot tone, and arranged with default pilot tone by the intertexture of the interleaver
Final output is used as after imaginary pilot tone arrangement replacement in data.
2. interleave unit as described in claim 1, which is characterized in that use Euclidean distance or standard Euclidean distance or graceful
Hatton's distance as fabricate pilot tone arrangement and default pilot tone arrange between similarity measurement, apart from smaller, similitude is bigger.
3. a kind of wireless communication data sending device successively includes: that the addition of CRC check position is single according to the flow direction of data to be sent
Member, channel encoding unit, constellation point unit, interleave unit, subcarrier mapping unit, IFFT unit, protection interval insertion
Unit, upconverting unit；It is characterized in that, the interleave unit is the intertexture list of producible pilot tone as claimed in claim 1 or 2
Member.
4. wireless communication data sending device as claimed in claim 3, which is characterized in that the parallel friendship in the interleave unit
The number K for knitting device meets following formula:
Wherein, Q indicates the order of constellation point unit,Floor operation in expression, d indicate the length of default pilot tone arrangement,For preset expected probit.
5. a kind of wireless communication data reception device, the data sent for receiving claim 3 or 4 described devices；According to institute
Receive data flow direction successively include: down-converter unit, protection interval removal unit, FFT unit, subcarrier de-mapping unit,
Channel estimating unit, deinterleaves unit, constellation point de-mapping unit, channel decoding unit, CRC check list at channel equalization unit
Member, selecting unit；It is characterized in that, the channel estimating unit is arranged according to the default pilot tone first, reflected from subcarrier solution
The output data for penetrating unit extracts the pilot tone arrangement received, is then arranged using the pilot tone arrangement and the default pilot tone that receive
Cloth carries out channel estimation；The deinterleaving unit includes one group of parallel deinterleaver, with the interleaver in the interleave unit
It corresponds；Constellation point de-mapping unit, channel decoding unit, CRC check unit respectively include and deinterleave the solution in unit
Interleaver one-to-one one group parallel constellation point de-mapping device, channel decoder, CRC check device, each deinterleaver with
Constellation point de-mapping device, channel decoder, CRC check device corresponding to it constitute a branch；The selecting unit be used for from
The data of the correct branch of CRC check are selected to be exported in each branch.
6. a kind of interleave unit of producible pilot tone characterized by comprising
Data grouping module, for input block to be divided into G data sub-block；
G parallel parallel interleaver groups, correspond with the G data sub-block；Each parallel interleaver group includes one group
Parallel interleaver and a selector；One group of parallel interleaver is used for parallel interleaver group where inputting it
Data sub-block is interleaved processing respectively；The selector is used to be exported according to each interleaver in parallel interleaver group where it
Interleaving data obtain the final output of the parallel interleaver group, the specific method is as follows: the friendship exported to each interleaver
Organization data, with wherein fix the data of position is constituted and the parallel interleaver group corresponding to default pilot tone arrange isometric void
The arrangement of structure pilot tone；It is selected to fabricate the arrangement of pilot tone and the default pilot tone from all interleavers of the parallel interleaver group
The identical interleaver of son arrangement, and using the interleaving data of the interleaver as the output of place parallel interleaver group；If no
Such interleaver then selects it to fabricate the arrangement of pilot tone and default pilot tone from all interleavers of the parallel interleaver group
It arranges most like interleaver, and is replaced the imaginary pilot tone arrangement in the interleaving data of the interleaver with default pilot tone arrangement
Output after changing as place parallel interleaver group；The default pilot tone arrangement is preset by the following method: will be preset
Pilot tone arrangement is divided into one-to-one G default pilot tone of the parallel interleaver group parallel with the G and arranges；
Data combination module is combined for the G output to the G parallel interleaver group, obtains interleave unit most
Output eventually.
7. interleave unit as claimed in claim 6, which is characterized in that use Euclidean distance or standard Euclidean distance or graceful
Hatton's distance as fabricate the arrangement of pilot tone and default pilot tone arrange between similarity measurement, apart from smaller, similitude is got over
Greatly.
8. a kind of wireless communication data sending device successively includes: that the addition of CRC check position is single according to the flow direction of data to be sent
Member, channel encoding unit, constellation point unit, interleave unit, subcarrier mapping unit, IFFT unit, protection interval insertion
Unit, upconverting unit；It is characterized in that, the interleave unit is the intertexture list of the producible pilot tone of claim 6 or 7
Member.
9. wireless communication data sending device as claimed in claim 8, which is characterized in that in the interleave unit j-th it is parallel
The number k of interleaver in interleaver groupjMeet following formula:
Wherein, Q indicates the order of constellation point unit,Floor operation in expression, djIndicate j-th of default pilot tone arrangement
Length,For preset probability value, j=1,2 ..., G.
10. a kind of wireless communication data reception device, the data sent for receiving claim 8 or 9 described devices；Its feature
It is, the flow direction according to received data successively includes: down-converter unit, protection interval removal unit, FFT unit, subcarrier
De-mapping unit, channel equalization unit, data packet units, deinterleaves unit, data arrangement unit, star at channel estimating unit
Seat point de-mapping unit, channel decoding unit, CRC check unit, selecting unit；The channel estimating unit is first according to
The pilot tone arrangement received is extracted in default pilot tone arrangement from the output data of subcarrier de-mapping unit, then using receiving
Pilot tone arrangement and default pilot tone arrangement carry out channel estimation；The data packet units are used for according to number in interleave unit
It is grouped according to the data that the mode of grouping module exports channel equalization unit；The unit that deinterleaves includes G parallel
Parallel deinterleaver group, corresponds with G parallel interleaver group in the interleave unit, each parallel deinterleaver group packet
It includes and the one-to-one one group of parallel deinterleaver of the interleaver in corresponding parallel interleaver group；Data arrangement unit is used for will
The output of G parallel deinterleaver groups is spliced, and is obtainedKind data combination, kiIndicate that i-th of parallel solution is handed over
Knit the deinterleaver quantity in device group；Constellation point de-mapping unit, channel decoding unit, CRC check unit respectively include and institute
It states N kind data group and closes one-to-one parallel N number of constellation point de-mapping device, N number of channel decoder, N number of CRC check device, often
The branch that kind data combination output is constituted to its corresponding constellation point de-mapping device, channel decoder, CRC check device；Institute
Selecting unit is stated for selecting the data of the correct branch of CRC check to be exported from each branch.
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