CN105282078B - The generation method of preprocess method and leading symbol to frequency-domain OFDM symbol - Google Patents
The generation method of preprocess method and leading symbol to frequency-domain OFDM symbol Download PDFInfo
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Abstract
The invention discloses the generation methods of the preprocess method of a kind of pair of frequency-domain OFDM symbol and leading symbol and data symbol.It wherein, include: Fourier inversion to be carried out after pre-processing to frequency-domain OFDM symbol again to obtain time-domain OFDM symbol to the preprocess method of frequency-domain OFDM symbol；Wherein, the pretreatment includes: and the leading symbol in all physical frames for sending on same transmitting antenna pre-processes corresponding frequency-domain OFDM symbol using the preconditioned functions of variation.The technical program is solved when occurring extreme multipath scenario in single frequency network, and receiver is the problem of certain receiving points can not receive always.
Description
Technical field
The present invention relates to wireless broadcast communication technical field, in particular to the pretreatment sides of a kind of pair frequency-domain OFDM symbol
The generation method of method and leading symbol and data symbol.
Background technique
In broadcast system, single frequency network networking technology is widely used.Single frequency network (Single Frequency
Network, SFN) it is the radio-transmitting station in synchronous regime by multiple and different places, in the same time, with same frequency
Rate emits same signal, to realize the reliable covering to certain service area.For connecing in the region of multiple transmitting stations overlapping covering
Receipts machine will receive the next same signal of several transmitting stations transmitting, form multipath, and receiver utilizes channel equalization technique by multipath
It eliminates, restores to send signal.But in certain special screnes, the signal transmitted from different transmitting stations can seriously be offset, frequency spectrum
Live part is eliminated, and causes reception failure.
For example, if transmitting station there are two antennas to do the mixed transport of SISO and MIMO, in the SISO stage, if two
Antenna repeats the signal, and will occur the problem of signal cancellation as single frequency network.Solving the problems, such as a kind of this method is
An antenna is turned off, only transmits SISO signal on an antenna wherein, it so also can be to transmitting when SISO and MIMO switches
Antenna makes troubles.
In view of the above-mentioned problems, cyclic delay diversity technical application is proposed into SFN scene in DVB_NGH standard
ESFN pre-distortion.Different transmitting antennas configures different transmitting antenna ID sequences in single frequency network network, not using this
Pre-distortion is carried out with OFDM symbol of the sequence to each transmitting antenna, so that different transmitting antennas reach same receiver
Signal will not be completely counterbalanced by.This technical solution high degree reduces different transmitting antennas while the signal arrived at mutually supports
The probability to disappear, but the extreme multipath scenario in single frequency network is not overcome, such as the 0DB2 diameter or two clusters of certain specific lengths
Diameter will cause fatal destruction for the leading symbol or data symbol of certain specific structures or length, cause Timing Synchronization and
The size of small inclined estimation, cyclic prefix (GI) detection and Fourier transformation (FFT) detects failure.
Summary of the invention
The invention solves when occurring extreme multipath scenario in single frequency network, receiver always can not in certain receiving points
The problem of reception.
To solve the above problems, the embodiment of the invention provides the preprocess methods of a kind of pair of frequency-domain OFDM symbol, including
Following steps: Fourier inversion is carried out after pre-processing to frequency-domain OFDM symbol again to obtain time-domain OFDM symbol；Wherein,
The pretreatment includes: for the leading symbol in all physical frames for sending on same transmitting antenna, to corresponding frequency domain
OFDM symbol is pre-processed using the preconditioned functions of variation.
Optionally, the pretreatment further include: for the same physics sent on the different transmitting antennas in single frequency network
Same leading symbol in frame pre-processes corresponding frequency-domain OFDM symbol using different preconditioned functions.
Optionally, the pretreatment further include: for the data symbols in all physical frames for being sent on same transmitting antenna
Number, corresponding frequency-domain OFDM symbol is pre-processed using fixed or variation preconditioned functions.
Optionally, the pretreatment further include: for the same physics sent on the different transmitting antennas in single frequency network
Same data symbol in frame pre-processes corresponding frequency-domain OFDM symbol using different preconditioned functions.
Optionally, the preconditioned functions include first phase disturbing function and/or second phase disturbing function.
Optionally, the preconditioned functions include first phase disturbing function and/or second phase disturbing function；
The preconditioned functions of variation refer to the first phase disturbing function and the second phase disturbing function wherein it
One or both all with each sign change；Wherein, the symbol includes only leading symbol or leading symbol and data symbol.
Optionally, the preconditioned functions include first phase disturbing function and/or second phase disturbing function；
Fixed preconditioned functions refer to that the first phase disturbing function and the second phase disturbing function are fixed, no
Change with each data symbol.
Optionally, the preconditioned functions include first phase disturbing function and/or second phase disturbing function；
Different preconditioned functions refer to the first phase disturbing function and the second phase disturbing function wherein it
One or both is all different.
Optionally, on same transmitting antenna, first phase disturbing function is with each sign change, and second phase disturbs
Function is fixed；And between different transmitting antennas, second phase disturbing function is generated according to the different ID sequences of transmitting antenna；
Wherein, the symbol includes leading symbol or including leading symbol and data symbol.
Optionally, the preconditioned functions include first phase disturbing function and/or second phase disturbing function；
Variable in the first phase disturbing function of the same transmitting antennaAnd/or in second phase disturbing function
VariableChanging perhaps pseudorandom variation at random by each symbol, wherein the symbol includes leading symbol or including before
Lead symbol and data symbol.
Optionally, the variable in the same transmitting antenna first phase disturbing functionAnd/or second phase disturbing function
In variablePseudorandom variation take the mode of pseudo-random sequence mapping to realize.
The embodiment of the invention also provides a kind of generation method of leading symbol in physical frame, include the following steps: in frequency
Fixed sequence program and signaling sequence are generated on domain respectively；Fixed sequence program and signaling sequence are filled to effective subcarrier, and described
It is arranged between fixed sequence program and signaling sequence in oem character set；Null sequence subcarrier is filled respectively in effective subcarrier two sides
To form frequency-domain OFDM symbol；The frequency-domain OFDM symbol is carried out using the above-mentioned preprocess method to frequency-domain OFDM symbol
Processing is to obtain time-domain OFDM symbol；Determine circulating prefix-length；It is long that the cyclic prefix is intercepted from the time-domain OFDM symbol
The time-domain OFDM symbol of degree is as cyclic prefix；The time-domain OFDM symbol of the circulating prefix-length based on above-mentioned interception generates
Modulated signal；Leading symbol is generated based on the cyclic prefix, the time-domain OFDM symbol and the modulated signal.
The embodiment of the invention also provides a kind of generation method of data symbol in physical frame, include the following steps: to lead
Frequency subcarrier and data subcarrier are filled to effective subcarrier；Null sequence is filled respectively in effective subcarrier two sides to carry
Wave is to form frequency-domain OFDM symbol；The frequency-domain OFDM symbol is carried out using the above-mentioned preprocess method to frequency-domain OFDM symbol
Processing is to obtain time-domain OFDM symbol；Determine circulating prefix-length；It is long that the cyclic prefix is intercepted from the time domain OFDM symbol
The time-domain OFDM symbol of degree splices the cyclic prefix in the front of the time-domain OFDM symbol to generate number as cyclic prefix
According to symbol.
Compared with prior art, technical solution of the present invention has the advantages that
Transmitting terminal is before carrying out Fourier inversion to frequency-domain OFDM symbol and obtaining time domain OFDM symbol, first to the frequency
Domain OFDM symbol is pre-processed.The preprocess method passes through to each of the physical frame that will be sent on same transmitting antenna
Leading symbol, to corresponding frequency-domain OFDM symbol (i.e. for generating the frequency-domain OFDM symbol of leading symbol) using the pre- place of variation
Reason function is pre-processed.And each data symbol in the physical frame for being sent on same transmitting antenna, to corresponding frequency
Domain OFDM symbol is pre-processed using fixed or variation preconditioned functions.So that the transmitting antenna coverage area
Signal received by any receiving end in interior or locating single frequency network environment is not in be in be completely counterbalanced by or pole always
Hold multipath can not be in received scene.Even if entering above-mentioned scene in some symbol moment, due to the variation of preconditioned functions, under
One symbol will jump out this scene at once, that is, can guarantee that 99.5% or more receiving time can normally receive.
Further, the preprocess method also by by sent on the different transmitting antennas in single frequency network it is same before
Symbol (can also be simultaneously to the same data symbol in same physical frame) be led, to corresponding frequency-domain OFDM symbol using different
Preconditioned functions are pre-processed.What high degree reduced in single frequency network in any 2 transmitting antenna coverage areas any connects
The probability for the phenomenon that signal received by receiving end is completely counterbalanced by.
Detailed description of the invention
Fig. 1 is the process signal of the specific embodiment of the preprocess method of a kind of pair of frequency-domain OFDM symbol of the invention
Figure；
Fig. 2 is that occur under extreme multipath scenario that the spatial structure of leading symbol or data symbol shows in physical frame in single frequency network
It is intended to；
Fig. 3 is that the phase of second phase disturbing function in the preprocess method of a kind of pair of frequency-domain OFDM symbol of the invention is special
The schematic diagram of property and amplitude characteristic；
Fig. 4 is the process signal of the specific embodiment of the generation method of leading symbol in a kind of physical frame of the invention
Figure；
Fig. 5 is the process signal of the specific embodiment of the generation method of data symbol in a kind of physical frame of the invention
Figure.
Specific embodiment
Inventor has found that when occurring extreme multipath scenario in single frequency network, receiver appears in certain in the prior art
The problem of receiving point can not receive always.
In view of the above-mentioned problems, inventor after study, provides the preprocess method of a kind of pair of frequency-domain OFDM symbol and preceding
Lead the generation method of symbol and data symbol.By carrying out Fourier inversion again after pre-processing to frequency-domain OFDM symbol
To obtain time-domain OFDM symbol, so that any in single frequency network, in same transmitting antenna or different transmitting antenna coverage areas
There is extreme multipath to solve in the phenomenon that signal received by receiving end is not in always in extreme multipath scenario
Under scene, the problem of certain receiving points can not receive always, guarantee that the receiving time of special 99.5% or more the receiving point can be just
Often receive.Specifically address the problem of causing entire receiver due to the synchronization failure of leading symbol not and can enter subsequent operation.
To make the above purposes, features and advantages of the invention more obvious and understandable, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.
As shown in Fig. 1 the stream of the specific embodiment of the preprocess method of a kind of pair of frequency-domain OFDM symbol of the invention
Journey schematic diagram.With reference to Fig. 1, which includes the following steps:
Step S11: Fourier inversion is carried out after pre-processing to frequency-domain OFDM symbol again to obtain time domain OFDM symbol
Number；Wherein, the pretreatment includes: for the leading symbol in all physical frames for sending on same transmitting antenna, to phase
The frequency-domain OFDM symbol answered is pre-processed using the preconditioned functions of variation.
Unlike the prior art, in the present embodiment, time domain is obtained carrying out Fourier inversion to frequency-domain OFDM symbol
Before OFDM symbol, first the frequency-domain OFDM symbol is pre-processed.
The pre-distortion technology of existing ESFN, configures different hairs in single frequency network network on different transmitting antennas
Antenna ID sequence is penetrated, using the difference sequence to the same leading symbol in the same physical frame sent on each transmitting antenna
Frequency-domain OFDM symbol corresponding to (or same data symbol) is pre-processed.To which high degree reduces in single frequency network arbitrarily
The phenomenon that signal received by any receiving end in 2 transmitting antenna coverage areas is completely counterbalanced by.This technical side
Case solves the problems, such as different transmitting antennas while the signal arrived at is cancelled out each other, but due to the pretreatment of each of which transmitting antenna
Be always maintained at it is constant, when receiving point enter extreme multipath scenario, have no idea to jump out, therefore do not overcome in single frequency network
Extreme multipath scenario.
For in the prior art, due in single frequency network environment since each transmitting antenna signal reaches the time of receiving end not
Together, multidiameter is caused.In particular, will cause specific length and knot when also will form certain extreme multipath scenario in single frequency network
Some correlation functions of the leading symbol of structure are severely impacted, for example detect whether with sliding auto-correlation desired signal, small
2 cluster diameters of the leading symbol that estimation etc. partially, also such as length are 1024, although the probability that this extreme multipath scenario occurs is not
Height in this receiving point, can not will detect always correctly but if once occurring, and cause receiving end that can not receive always.
For example, as shown in Fig. 2 occurring under extreme multipath scenario leading symbol or data symbols in physical frame in single frequency network
Number spatial structure schematic diagram.
With reference to (a) in Fig. 2, which is common using cyclic prefix as the structure of protection interval, will
The rear portion A2 of the OFDM symbol A of 1024 length copies to cyclic prefix of the front as the OFDM symbol of A.
With reference to (b) in Fig. 2, when occurring the scene of 0DB2 diameter, length 1024, phase 180 under single frequency network environment
Degree.From in Fig. 2 (b) as can be seen that the part in virtual coil, (i.e. the rear portion A2 of the OFDM symbol A of 1024 length is due to multipath
Relationship is cancelled completely, to the peak detection of leading symbol, Timing Synchronization and small inclined estimation, or to the circulation of data symbol before
Sew (GI) detection and the size detection of Fourier transformation FFT brings and seriously affects.
Wherein, data symbol refer in physical frame carry data information (such as transmitting terminal need to receiving end transmit
Broadcast data etc.) part, may include multiple data symbols in a physical frame, data symbol can be by the frequency domain
OFDM symbol carries out various processing, and (including but not limited to Fourier inversion, addition cyclic prefix etc., are also wrapped in the present embodiment
Include to frequency-domain OFDM symbol carry out Fourier inversion before pre-process) after obtain.
Leading symbol is the additional character of ofdm system, and as the beginning of physical frame, purposes includes but not leading symbol
Be limited to: detect receiving end rapidly with determine transmitted in channel whether be expectation received signal；2) basic pass is provided
Defeated parameter (such as FFT points, frame type information etc.), so that receiving end can carry out receipt of subsequent processing；3) it detects initial
Carrier wave frequency deviation and timing error reach frequency and Timing Synchronization after compensating.Therefore, leading symbol is that receiver normally receives
Basis.
It illustrates, the similar P2 symbol in DVB_T2 system, structure and data symbol are essentially identical, are used for
Signaling is transmitted, it is treated as data symbol in the present invention.
Therefore, it in the embodiment of the present invention, is carried out in preprocessing process to frequency-domain OFDM symbol, for will be in same transmitting
The leading symbol in all physical frames sent on antenna is used to frequency-domain OFDM symbol corresponding to these leading symbols is generated
The preconditioned functions of variation are pre-processed, so that received by any receiving end in the transmitting antenna coverage area
Signal is not in be in be completely counterbalanced by or extreme multipath can not be in received scene always.
And the data symbol in all physical frames for will be sent on same transmitting antenna, to corresponding frequency-domain OFDM
Symbol can be pre-processed using fixed or variation preconditioned functions.As long as that is, guaranteeing same transmitting day
Leading symbol in all physical frames sent on line uses the pretreatment mode of variation, and then can root for data symbol
According to needing to select fixed or changed pretreatment mode.
Further, in the present embodiment, the pretreatment mode further include:
1) for the same leading symbol in the same physical frame that is sent on the different transmitting antennas in single frequency network, to phase
The frequency-domain OFDM symbol answered is pre-processed using different preconditioned functions.
2) for the same data symbol in the same physical frame that is sent on the different transmitting antennas in single frequency network, to phase
The frequency-domain OFDM symbol answered is pre-processed using different preconditioned functions.
Here the difference in different preconditioned functions can be tolerated in 2 antennas of some symbol and occur pre-processing phase
Together, the case where but most times are different from.At this moment due to the angle in realization, with pseudo-random sequence mapping or others
Some implementations are different surely to accomplish that each symbol is different from completely.
The pretreatment is handled frequency-domain OFDM symbol including the use of preconditioned functions.Wherein, the pretreatment letter
Number includes first phase disturbing function and second phase disturbing function.
In the above-described embodiments, the preconditioned functions of so-called variation refer to the first phase disturbing function and described second
One of phase perturbation function or both is all with each sign change；Wherein, the symbol includes leading symbol or packet
Include leading symbol and data symbol.The preconditioned functions of so-called fixation refer to the first phase disturbing function and second phase
Phase perturbation function is fixed, and is not changed with each data symbol.So-called different preconditioned functions refer to the first phase disturbance
One of function and the second phase disturbing function or both are all different.
The pretreated process is described in detail below with reference to specific example.
By taking length is the frequency-domain OFDM symbol of 1024 (i.e. 1K) as an example.
Pre-distortion technology is actually that will send p (t) in signal s (t) preparatory convolution, will be sent in frequency domain
S (k) becomes P (k) S (k).
ESFN pre-distortion generates different preconditioned functions P in single frequency network environment on different transmitting antennas
(k), such as, then transmitting antenna 1 sends Xtx1(k)=Ptx1(k) S (k), transmitting antenna 2 send Xtx2(k)
=Ptx2(k) S (k), due to Ptx1(k) and Ptx2(k) different, then Xtx1(k) and Xtx2It (k) can not be completely when reaching receiving point
It offsets.And the pre-distortion technology proposed in the present embodiment, it is not only Ptx1(k) and Ptx2(k) different, and for some hair
Penetrate antennaFor, it is variation to preconditioned functions used by the corresponding frequency-domain OFDM symbol of each leading symbol
, and to each data symbol, to corresponding frequency-domain OFDM symbol can using fixed or variation preconditioned functions into
Row pretreatment.
Hereinafter by taking leading symbol as an example, adopted for frequency-domain OFDM symbol corresponding to each leading symbol and data symbol
For the preconditioned functions of variation.For the corresponding frequency-domain OFDM symbol of each leading symbol using the pretreatment letter of variation
Number, and the corresponding frequency-domain OFDM symbol of each data symbol can be deduced accordingly using the example of fixed preconditioned functions, this
In repeat no more.
The subcarrier in frequency domain of frequency-domain OFDM symbol is divided into L sections, the different phase of every section of modulation, and with raised cosine come
Discontinuous phase between smooth two sections, and finally modulate according to the serial number of subcarrier multiplied by certain frequency deviation and prolonged with reaching time domain cyclic
Slow effect.
Its preconditioned functions can be described as following formula:
Wherein,
txm, m expression m root transmitting antenna, n indicate n-th of OFDM symbol.The value of L is in different frequency-domain OFDM symbols
In, it can be the same or different.HRC(k) desirable 0.5 α in expression formula.
Wherein,
In above-mentioned formula 1For m-th of transmitting antenna, the length of n-th of frequency-domain OFDM symbol, in the present embodiment
Middle NFFT is 1024.In systems in practice, the NFFT of leading symbol P1, P2 and data symbol is often different.
In the present embodiment, willReferred to as first phase disturbing function；
Referred to as second phase disturbing function.
In ESFN pretreatment, the different TXID of the correspondence of different transmitting antennas is generated by TXID for each leading
The fixed Γ of symbolm(l) and Δm, i.e. only different transmitting antenna, preconditioned functions Ptx1(k) and Ptx2(k) different, and same
In all leading symbols of one transmitting antenna, which is remained unchanged.In this way under certain transmission conditions, Mou Xiejie
Sink still is possible to form fixed multipath scenario.
Therefore, in the present embodiment, in order to realize the differences of preconditioned functions, it is necessary to so that first phase disturbing function and
All with each sign change one of in second phase disturbing function or both, can be only achieved not always in extreme more
The purpose of the scene of diameter.
Specifically, in first phase disturbing functionIn second phase disturbing functionIn different hairs
Penetrate the same leading symbol of antenna, value variation, i.e., on common meaningAnd/orWhen
So it is not excluded for being randomly generated or can occurs once in a whileAnd/orBut as long as being every in trend
A sign change.This variation, can be randomly generated or pseudorandom generate.Also, for will be in the same hair
Penetrating frequency-domain OFDM symbol corresponding to the leading symbol sent on antenna, also value is different, i.e.,And/or(in above-mentioned formula, m indicates that m root transmitting antenna, n indicate nth symbol), examines from the angle of realization certainly
Worry is also not excluded for once in a while that some symbol is there is a situation where identical, but most symbol is different.In this way, connecing at any one
Sink first it is not possible that the signal that two emitting antennas reaches certain receiving point is completely counterbalanced by always, and is also impossible to be formed solid
Fixed certain constant extreme multipath scenario, even if nth symbol is formed, (n+1)th symbol is not just re-formed.
The generation method of disturbing function is detailed below.
Firstly, first phase disturbing functionIts expression formula in the time domain are as follows:
It will be on actual channel response h (t) multiplied by thisTo overcome the multidiameter of certain fixation,
The value of very little is typically set to not change the maximum multipath length that system can be fought, value in each frequency-domain OFDM sign change,
To realize the multipath scenario of each sign change, such as the random value in { 0,1,2,3 }.
Secondly, second phase disturbing functionBy subcarrier in frequency domain, it is divided into L sections, the different phase of every section of modulation
Position, and with raised cosine come the discontinuous phase between smooth two sectionsEffect be that it is divided by subcarrier in frequency domain
L sections, the different phase of every section of modulation, and the phase change of two adjacent segments is no more than 1/8, i.e., phase angle change is no more than in above formulaThis is because it is no longer 1 that adjacent raised cosine sums it up amplitude in two sections of phase change.
It is above-mentionedExpression formula inIt generates as follows:
Wherein, l=0,1 ... L；Init_phase and rand_seq changes under different n and m values, i.e., different
Transmitting antenna and the variation of different frequency-domain OFDM intersymbol, to realize the same leading character sent on each transmitting antenna
Number when pretreatment it is different, and the multipath reception scene that each leading symbol changes.
Can each symbol generate at random or pseudo-random generation, such as by generating.Each symbol randomly or pseudo-randomly generates the rand_seq of a L+1 bit.Such as L
=8, in nth symbol rand_seq=(0, -1,1,0,0,0,1, -1), (n+1)th symbol rand_seq=(1, -1,0,
1,-1,1,1,0,0)。
Especially, it should be noted that it is due to two sides filling is zero carrier, and centre has been only in frequency-domain OFDM symbol
Subcarrier is imitated, so actually active in L sections may be L1 sections, wherein L1Less than or equal to L, such as in the example of L=8, if L1
=6, then only intermediate 6 sections effectively, corresponding rand_seq also only intermediate 6 values effectively, then nth symbol rand_seq
It is different with (n+1)th rand_seq to be meant that in-between 6 values be different.
As shown in Fig. 3 second phase disturbing function in the preprocess method of a kind of pair of frequency-domain OFDM symbol of the invention
Phase characteristic and amplitude characteristic schematic diagram.Wherein with reference to Fig. 3, L value is 8.(i.e. (a) by the amplitude characteristic figure in Fig. 3
Figure) as can be seen that being no longer 1 (in such as Fig. 2 since adjacent raised cosine sums it up amplitude in two sections of phase change
Value between 0.92-0.93), it is therefore desirable to multiplied by range coefficientSubcarrier in frequency domain mean power is adjusted back 1.
In above-mentioned preference, on same transmitting antenna, first phase disturbing function and second phase disturbing function are all
First phase disturbing function and second phase disturbing function with each sign change, and between different transmitting antennas is all different.
Another preference is, on same transmitting antenna, first phase disturbing function is with each sign change, and
Two phase disturbing function is fixed, and between different transmitting antennas, and second phase disturbing function is according to the different ID sequences of transmitting antenna
Column are realizing the difference of second phase disturbing function by different ID in this way to generate, and can use this to realize transmitting
Antenna identification.
Above description describes the generating process of first phase disturbing function and second phase disturbing function.Lower mask body is retouched
State variable in the two phase perturbation functionsAnd/orRandom generation method two examples.
For example, generating the very long pseudo-random sequence of length, such as 2 for each transmitting antenna m23Length it is pseudo- with
Machine sequence.The pseudo-random sequence of different transmitting antennas is different, to realize different transmitting antennas in same leading symbol
The difference of preconditioned functions.In that pseudo-random sequence of each transmitting antenna, such asValue has 4 kinds of possibility, then each
Symbol takes 2 bits to be mapped toValue.Such as L=8,In each l need 3 bits to mapEach symbol needs (L+1) * 3=27 bit to completeBe randomly generated.I.e.
The preconditioned functions of one frequency domain ODFM symbol need 29 bits of pseudo-random sequence to map.
In another example for each transmitting antenna m,Still by the way of above-mentioned pseudo-random sequence mapping, each symbol
Variation, butAll symbols are all fixed, defined by sender unit identification sequenceL=0,
1 ... L is to realize that different transmitters second phase disturbing function is different and can accomplish that transmitter identifies.
In addition, in the present embodiment, the preconditioned functions include 2 phase perturbation functions, tend to reach most in this way
Excellent effect can also be selected only one such in actual application.
For example only selecting the first phase disturbing function of cyclic delay diversity, then (1) formula becomes
At this moment running parameter is
Alternatively, only selecting second phase disturbing function, then (1) formula becomes
At this moment running parameter is
The technical program does not limit specific preconditioned functions, and above-mentioned introduction is only one such, does not limit this yet
Any design parameter in embodiment andWithGeneration method.
After obtaining preconditioned functions, by former frequency-domain OFDM symbolMultiplied by the preconditioned functions, the frequency that obtains that treated
Domain OFDM symbol.
Inverse-Fourier is carried out later to change to obtain time domain ODFM symbol.The embodiment of the invention also provides in a kind of physical frame
The generation method of leading symbol.As shown in Fig. 4 in a kind of physical frame of the invention the generation method of leading symbol it is specific
The flow diagram of embodiment.With reference to Fig. 4, the generation method of leading symbol includes the following steps: in physical frame
Step S41: fixed sequence program and signaling sequence are generated respectively on frequency domain；
Step S42: fixed sequence program and signaling sequence are filled to effective subcarrier, and the fixed sequence program and signaling sequence
It is arranged between column in oem character set；
Step S43: null sequence subcarrier is filled respectively in effective subcarrier two sides to form frequency-domain OFDM symbol；
Step S44: the frequency-domain OFDM symbol is handled using the above-mentioned preprocess method to frequency-domain OFDM symbol
To obtain time-domain OFDM symbol；
Step S45: circulating prefix-length is determined；
Step S46: the time-domain OFDM symbol of the circulating prefix-length is intercepted as circulation from the time-domain OFDM symbol
Prefix；
Step S47: the time-domain OFDM symbol of the circulating prefix-length based on above-mentioned interception generates modulated signal；
Step S48: leading symbol is generated based on the cyclic prefix, the time-domain OFDM symbol and the modulated signal.
Specifically, as described in step S41, fixed sequence program and signaling sequence are generated respectively on frequency domain.Wherein, described solid
Sequencing column include that receiving end can be used to do the relevant information of carrier frequency synchronization and Timing Synchronization, the signaling sequence includes each
Frequency expansion sequence corresponding to basic configured transmission.
As described in step S42, the fixed sequence program and signaling sequence are filled to effective subcarrier, and the fixed sequence
It is arranged between column and signaling sequence in oem character set.
In one preferred embodiment, the equal length of the length of the fixed sequence program and the signaling sequence, and
The length is less than the 1/2 of the predetermined length.Wherein, the predetermined length is 1024, but can also be according to being in practical application
System demand and change.
By taking predetermined length is 1024 as an example, if the length of fixed sequence program is N (i.e. effective subcarrier of carrying fixed sequence program
Number is N), the length of signaling sequence be M (i.e. the number of effective subcarrier of carrier signaling sequence is M), in the present embodiment,
M=N.In other embodiments, N can also be slightly larger than M.
Between the fixed sequence program and signaling sequence in oem character set arrange, i.e., fixed sequence program fill to even subcarrier (or
Odd subcarrier) on position, correspondingly, signaling sequence is filled to odd subcarrier (or even subcarrier) position, thus in frequency domain
The distribution of fixed sequence program and the arrangement of signaling sequence oem character set is presented on effective subcarrier.It should be noted that when fixing
When sequence and the inconsistent length of signaling sequence (such as M > N), fixation can be realized by way of zero padding sequence subcarrier
Sequence and the arrangement of signaling sequence oem character set.
As described in step S43, null sequence subcarrier is filled respectively in effective subcarrier two sides to form predetermined length
Frequency-domain OFDM symbol.
In a preferred embodiment, this step includes: to fill the zero of equal length respectively in effective subcarrier two sides
Sequence subcarrier is to form the frequency-domain OFDM symbol of predetermined length.
Along the example for being 1024 to predetermined length, the G=1024-M-N of the length of null sequence subcarrier, two sides filling
(1024-M-N)/2 null sequence subcarrier.
Further, in order to guarantee that receiving end can still be located within the scope of -500kHz to 500kHz in carrier frequency offset
Reason receives signal, and the value of (1024-M-N)/2 is typically larger than critical length value (being set as TH), and the critical length value is by system symbol
Rate and predetermined length determine.For example, system symbol rate of the predetermined length for 1024,7.61M, the sample rate of 9.14M, then For example, M=N=353, then G=318, two sides are respectively filled
159 null sequence subcarriers.
Therefore, subcarrier (i.e. frequency-domain OFDM symbol) P1_X of predetermined length (1024)0, P1_X1..., P1_X1023By
Following manner filling generates:
Wherein, fixed sequence program subcarrierSignaling sequence subcarrierLocating odd even position can be interchanged.
As described in the step S44, the above-mentioned pretreatment side to frequency-domain OFDM symbol is used to the frequency-domain OFDM symbol
Method is handled and carries out inverse-Fourier transform to obtain time-domain OFDM symbol.
I.e.
P1_X'(k) is done into inverse fourier transform and obtains P1_A (t).
The implementation process of this step can refer to embodiments above, and details are not described herein.
As described in step S45, circulating prefix-length is determined.
In the present embodiment, it needs to add cyclic prefix (CP) before time-domain OFDM symbol, wireless broadcast communication system can
To determine that the circulating prefix-length (is set as N according to different channel circumstancescp).For example, can be according to wireless broadcast communication system
System needs the multipalh length fought to determine circulating prefix-length.That is, when generating leading symbol, wireless broadcast communication
System can determine that the multipalh length fought required for the leading symbol, and determine cyclic prefix with this.
As described in step S46, the time-domain OFDM symbol for intercepting the circulating prefix-length from the time-domain OFDM symbol is made
For cyclic prefix.
In the present embodiment, the circulating prefix-length is equal to or less than the predetermined length.With the predetermined length
For 1024, the circulating prefix-length can be 1024 or less than 1024.Preferably, the circulating prefix-length is
512, that is to say, that in this step, the latter half (length 512) for intercepting the time-domain OFDM symbol is used as cyclic prefix,
To solve the problems, such as the decline of channel estimation in frequency domain performance.
As described in step S47, the time-domain OFDM symbol of the circulating prefix-length based on above-mentioned interception generates modulation letter
Number.In practice, the length of modulated signal cannot exceed the length of cyclic prefix part.
Specifically, this step includes:
1) a frequency displacement sequence is set；
2) by the time domain OFDM of the time-domain OFDM symbol of the circulating prefix-length or the part circulating prefix-length
Symbol is multiplied by the frequency displacement sequence to obtain the modulated signal.
For example, setting NcpFor determining circulating prefix-length, LenBFor the length of modulated signal.If NAFor time-domain OFDM symbol
Length, if sampled point serial number 0,1 ... the N of time-domain OFDM symbolA- 1. set N1 to select to be copied to rising for modulated signal section
The sampled point serial number of the corresponding time domain OFDM symbol of point, N2 are the corresponding time domain of terminal that selection is copied to modulated signal section
OFDM symbol sampled point serial number.Wherein,
N2=N1+LenB-1
For ease of description, time-domain OFDM symbol is divided into 2 parts, first segment is not intercepted as before cyclic prefix
Portion, second segment are rear portion of the interception as cyclic prefix.If interception time-domain OFDM symbol is all used as cyclic prefix, first segment
For 0 length.N1 is centainly fallen in second segment, that is, the range to the part time-domain OFDM symbol of modulated signal section is selected not surpass
The range of the part time-domain OFDM symbol as cyclic prefix is intercepted out.
The modulated signal of the part time-domain OFDM symbol is P1_B (t), and P1_B (t) is by the part time-domain OFDM symbol
It is obtained multiplied by frequency deviation sequence M (t), which is Wherein fSHIt can be chosen for time-domain OFDM symbol
Corresponding subcarrier in frequency domain interval (i.e. 1/NAT), wherein T is sampling period, NAFor the length of time-domain OFDM symbol.In this example
In, NAIt is 1024, takes fSH=1/1024T.
As described in step S48, it is based on institute
It states cyclic prefix, the time-domain OFDM symbol and the modulated signal and generates leading symbol.
Specifically, the cyclic prefix is spliced in the front of the time-domain OFDM symbol as protection interval, and by institute
Modulated signal is stated to splice at the rear portion of the OFDM symbol as frequency modulation sequence to generate leading symbol.For example, leading character
Number can according to use following time-domain expression:
In a preferred embodiment, the predetermined length NAWhen=1024, Ncp=520, LenB=504, N1 504
Or 520.
The embodiment of the invention also provides a kind of generation methods of data symbol in physical frame.This hair as shown in Fig. 5
The flow diagram of the specific embodiment of the generation method of data symbol in a kind of bright physical frame.With reference to Fig. 5, in physical frame
The generation method of data symbol includes the following steps:
Step S51: pilot sub-carrier and data subcarrier are filled to effective subcarrier；
Step S52: null sequence subcarrier is filled respectively in effective subcarrier two sides to form frequency-domain OFDM symbol；
Step S53: the frequency-domain OFDM symbol is handled using the above-mentioned preprocess method to frequency-domain OFDM symbol
To obtain time-domain OFDM symbol；
Step S54: circulating prefix-length is determined；
Step S55: the time-domain OFDM symbol of the circulating prefix-length is intercepted as circulation from the time-domain OFDM symbol
Prefix splices the cyclic prefix in the front of the time domain OFDM symbol to generate data symbol.
Above-mentioned steps S51, step S52, step S54 and step S55 can be realized using the prior art in practice,
Wherein the pilot tone in step S51 includes CP continuous pilot and scattered pilot.Step S54 can be according to embodiment described above come real
Existing, details are not described herein.
It should be noted that in practical applications, transmitting terminal can generate frequency using existing or other any modes
Domain OFDM symbol, be then based on a kind of pair of frequency-domain OFDM symbol provided in an embodiment of the present invention preprocess method handled with
Obtaining time-domain OFDM symbol, (it is the prior art that the Fourier that uses, which becomes inverse transformation, after wherein pre-processing, in the embodiment of the present invention not
Repeat again), and then be based on the time-domain OFDM symbol using existing or other any modes and generate leading symbol and data symbols
Number.That is, in practical applications, however it is not limited to leading symbol and data symbol in physical frame provided in an embodiment of the present invention
Generation method.
Although the invention has been described by way of example and in terms of the preferred embodiments, but it is not for limiting the present invention, any this field
Technical staff without departing from the spirit and scope of the present invention, may be by the methods and technical content of the disclosure above to this hair
Bright technical solution makes possible variation and modification, therefore, anything that does not depart from the technical scheme of the invention, and according to the present invention
Technical spirit any simple modifications, equivalents, and modifications to the above embodiments, belong to technical solution of the present invention
Protection scope.
Claims (13)
1. the preprocess method of a kind of pair of frequency-domain OFDM symbol, which comprises the steps of:
Fourier inversion is carried out after pre-processing to frequency-domain OFDM symbol again to obtain time-domain OFDM symbol；Wherein,
The pretreatment includes: for the leading symbol in all physical frames for sending on same transmitting antenna, to corresponding
Frequency-domain OFDM symbol is pre-processed using the preconditioned functions of variation,
Wherein, the preconditioned functions include first phase disturbing function and/or second phase disturbing function,
First phase disturbing function uses
Second phase disturbing function uses
Preconditioned functions include:
'sAnd/orOFDM symbol of the parameter on the symbol that the same antenna emits with leading symbol be different and value not
Together,
Wherein, m indicates that m root transmitting antenna, n indicate n-th of OFDM symbol, and k indicates subcarrier, and subcarrier in frequency domain is divided into L sections.
2. as described in claim 1 to the preprocess method of frequency-domain OFDM symbol, which is characterized in that the pretreatment is also wrapped
It includes: for the same leading symbol in the same physical frame that is sent on the different transmitting antennas in single frequency network, to corresponding frequency
Domain OFDM symbol is pre-processed using different preconditioned functions.
3. as described in claim 1 to the preprocess method of frequency-domain OFDM symbol, which is characterized in that the pretreatment is also wrapped
It includes: for the data symbol in all physical frames for being sent on same transmitting antenna, to corresponding frequency-domain OFDM symbol using solid
Fixed or variation preconditioned functions are pre-processed.
4. as claimed in claim 2 to the preprocess method of frequency-domain OFDM symbol, which is characterized in that the pretreatment is also wrapped
It includes: for the same data symbol in the same physical frame that is sent on the different transmitting antennas in single frequency network, to corresponding frequency
Domain OFDM symbol is pre-processed using different preconditioned functions.
5. as described in claim 1 to the preprocess method of frequency-domain OFDM symbol, which is characterized in that the preconditioned functions packet
Include first phase disturbing function and/or second phase disturbing function.
6. the preprocess method as claimed in claim 1 or 3 to frequency-domain OFDM symbol, which is characterized in that the pretreatment letter
Number includes first phase disturbing function and/or second phase disturbing function；
The preconditioned functions of variation refer to one of the first phase disturbing function and the second phase disturbing function or
Person is both with each sign change；Wherein, the symbol includes only leading symbol or leading symbol and data symbol.
7. as claimed in claim 3 to the preprocess method of frequency-domain OFDM symbol, which is characterized in that the preconditioned functions packet
Include first phase disturbing function and/or second phase disturbing function；
Fixed preconditioned functions refer to that the first phase disturbing function and the second phase disturbing function are fixed, not with every
A data sign change.
8. the preprocess method as claimed in claim 2 or 4 to frequency-domain OFDM symbol, which is characterized in that the pretreatment letter
Number includes first phase disturbing function and/or second phase disturbing function；
Different preconditioned functions refer to one of the first phase disturbing function and the second phase disturbing function or
Person is neither same.
9. as claimed in claim 6 to the preprocess method of frequency-domain OFDM symbol, which is characterized in that
On same transmitting antenna, first phase disturbing function is with each sign change, and second phase disturbing function is fixed；And
Between different transmitting antennas, second phase disturbing function is generated according to the different ID sequences of transmitting antenna；
Wherein, the symbol includes leading symbol or including leading symbol and data symbol.
10. as claimed in claim 6 to the preprocess method of frequency-domain OFDM symbol, which is characterized in that the preconditioned functions
Including first phase disturbing function and/or second phase disturbing function；
Variable in the first phase disturbing function of the same transmitting antennaAnd/or the variable in second phase disturbing functionChanging perhaps pseudorandom variation at random by each symbol, wherein the symbol includes leading symbol or including leading character
Number and data symbol.
11. as claimed in claim 10 to the preprocess method of frequency-domain OFDM symbol, which is characterized in that the same transmitting antenna
Variable in first phase disturbing functionAnd/or the variable in second phase disturbing functionPseudorandom variation take
The mode of pseudo-random sequence mapping is realized.
12. the generation method of leading symbol in a kind of physical frame, which comprises the steps of:
Generate fixed sequence program and signaling sequence respectively on frequency domain；
Fixed sequence program and signaling sequence are filled to effective subcarrier, and are in odd even between the fixed sequence program and signaling sequence
It is staggered；
Fill null sequence subcarrier respectively in effective subcarrier two sides to form frequency-domain OFDM symbol；
To the frequency-domain OFDM symbol use the preprocess method described in claim 1 to frequency-domain OFDM symbol to be handled with
Obtain time-domain OFDM symbol；
Determine circulating prefix-length；
The time-domain OFDM symbol of the circulating prefix-length is intercepted as cyclic prefix from the time-domain OFDM symbol；
The time-domain OFDM symbol of the circulating prefix-length based on above-mentioned interception generates modulated signal；
Leading symbol is generated based on the cyclic prefix, the time-domain OFDM symbol and the modulated signal.
13. the generation method of data symbol in a kind of physical frame, which comprises the steps of:
Pilot sub-carrier and data subcarrier are filled to effective subcarrier；
Fill null sequence subcarrier respectively in effective subcarrier two sides to form frequency-domain OFDM symbol；
To the frequency-domain OFDM symbol use the preprocess method described in claim 1 to frequency-domain OFDM symbol to be handled with
Obtain time-domain OFDM symbol；
Determine circulating prefix-length；
The time-domain OFDM symbol of the circulating prefix-length is intercepted as cyclic prefix, by the circulation from the time-domain OFDM symbol
Prefix splicing is in the front of the time-domain OFDM symbol to generate data symbol.
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| CN201410274626.1A CN105282078B (en) | 2014-06-19 | 2014-06-19 | The generation method of preprocess method and leading symbol to frequency-domain OFDM symbol |
| CN201611199976.1A CN106998312B (en) | 2014-04-16 | 2015-02-06 | Preamble symbol receiving method |
| CA2945855A CA2945855A1 (en) | 2014-04-16 | 2015-04-16 | Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device |
| KR1020167032057A KR101975551B1 (en) | 2014-04-16 | 2015-04-16 | Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses |
| KR1020207014009A KR102223654B1 (en) | 2014-04-16 | 2015-04-16 | Method and apparatus for receiving preamble symbol |
| US15/304,857 US10148476B2 (en) | 2014-04-05 | 2015-04-16 | Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device |
| KR1020207036622A KR102347011B1 (en) | 2014-04-16 | 2015-04-16 | Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses |
| PCT/CN2015/076814 WO2015158295A1 (en) | 2014-04-16 | 2015-04-16 | Method and apparatus for receiving preamble symbol |
| US15/304,851 US11071072B2 (en) | 2014-04-16 | 2015-04-16 | Preamble symbol receiving method and device |
| PCT/CN2015/076808 WO2015158292A1 (en) | 2014-04-16 | 2015-04-16 | Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses |
| CA2945857A CA2945857C (en) | 2014-04-16 | 2015-04-16 | Preamble symbol receiving method and device |
| KR1020207035510A KR102234307B1 (en) | 2014-04-16 | 2015-04-16 | Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses |
| CA2945856A CA2945856C (en) | 2014-04-16 | 2015-04-16 | Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device |
| KR1020167032059A KR102062221B1 (en) | 2014-04-16 | 2015-04-16 | Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses |
| KR1020167032055A KR102048221B1 (en) | 2014-04-16 | 2015-04-16 | Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses |
| CA2945858A CA2945858C (en) | 2014-04-16 | 2015-04-16 | Preamble symbol receiving method and device |
| CA3212005A CA3212005A1 (en) | 2014-04-16 | 2015-04-16 | Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device |
| KR1020167032058A KR102033742B1 (en) | 2014-04-16 | 2015-04-16 | Method and apparatus for receiving preamble symbol |
| KR1020197012400A KR102108291B1 (en) | 2014-04-16 | 2015-04-16 | Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses |
| KR1020197033488A KR102191859B1 (en) | 2014-04-16 | 2015-04-16 | Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses |
| US15/304,853 US10411929B2 (en) | 2014-04-05 | 2015-04-16 | Preamble symbol receiving method and device |
| CA3211647A CA3211647A1 (en) | 2014-04-16 | 2015-04-16 | Preamble symbol receiving method and device |
| US15/304,856 US10574494B2 (en) | 2014-04-16 | 2015-04-16 | Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device |
| KR1020167032043A KR101974621B1 (en) | 2014-04-16 | 2015-04-16 | Method and apparatus for receiving preamble symbol |
| KR1020197018441A KR102114352B1 (en) | 2014-04-16 | 2015-04-16 | Method and apparatus for receiving preamble symbol |
| PCT/CN2015/076812 WO2015158293A1 (en) | 2014-04-16 | 2015-04-16 | Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses |
| CA2945854A CA2945854A1 (en) | 2014-04-16 | 2015-04-16 | Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device |
| PCT/CN2015/076813 WO2015158294A1 (en) | 2014-04-16 | 2015-04-16 | Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses |
| KR1020197038044A KR102196222B1 (en) | 2014-04-16 | 2015-04-16 | Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses |
| US15/304,854 US10778484B2 (en) | 2014-04-16 | 2015-04-16 | Preamble symbol transmitting method and device, and preamble symbol receiving method and device |
| PCT/CN2015/076815 WO2015158296A1 (en) | 2014-04-16 | 2015-04-16 | Method and apparatus for receiving preamble symbol |
| US16/172,662 US11201770B2 (en) | 2014-04-16 | 2018-10-26 | Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device |
| US16/172,727 US11025465B2 (en) | 2014-04-16 | 2018-10-27 | Preamble symbol receiving method and device |
| US16/726,927 US11012275B2 (en) | 2014-04-16 | 2019-12-26 | Preamble symbol transmitting method and device |
| US16/726,928 US10958494B2 (en) | 2014-04-16 | 2019-12-26 | Preamble symbol receiving method and device |
| US16/992,040 US11128504B2 (en) | 2014-04-16 | 2020-08-12 | Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device |
| US16/992,038 US11088884B2 (en) | 2014-04-16 | 2020-08-12 | Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device |
| US16/992,041 US11088885B2 (en) | 2014-04-16 | 2020-08-12 | Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device |
| US16/992,039 US11082274B2 (en) | 2014-04-16 | 2020-08-12 | Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device |
| US17/351,197 US11799706B2 (en) | 2014-04-16 | 2021-06-17 | Preamble symbol receiving method and device |
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