CN106534032A - Method for generating frequency domain OFDM symbol - Google Patents
Method for generating frequency domain OFDM symbol Download PDFInfo
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- CN106534032A CN106534032A CN201611106688.7A CN201611106688A CN106534032A CN 106534032 A CN106534032 A CN 106534032A CN 201611106688 A CN201611106688 A CN 201611106688A CN 106534032 A CN106534032 A CN 106534032A
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- sequence
- ofdm symbol
- length
- signaling sequence
- signaling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/0055—ZCZ [zero correlation zone]
- H04J13/0059—CAZAC [constant-amplitude and zero auto-correlation]
Abstract
The invention discloses a method for generating a frequency domain OFDM symbol. The method is characterized by further comprising the following steps before discrete Fourier transform is performed on the frequency domain OFDM symbol with a predetermined length to obtain a time domain OFDM symbol: determining an average power ratio of a fixed sequence to a signaling sequence; separately generating the fixed sequence and the signaling sequence on the frequency domain according to the average power ratio; filling the fixed sequence and the signaling sequence on an effective subcarrier, wherein the fixed sequence and the signaling sequence are arranged in an odd-even stagger manner; and respectively filling zero sequence subcarriers on both sides of the effective subcarrier to form the frequency domain OFDM symbol with the predetermined length. The problem that a failure probability is detected by a low- complexity receiving algorithm of a pilot symbol in a frequency selective fading channel in the existing DVB_T2 standard is solved.
Description
The application is the divisional application of original bill, the application number 201410229558.7 of original bill, May 28 2014 applying date
Day, invention and created name《The generation method of leading symbol in physical frame》.
Technical field
The present invention relates to wireless broadcast communication technical field, the generation side of leading symbol in more particularly to a kind of physical frame
Method.
Background technology
The data sent by transmitting terminal are demodulated correctly generally for the receiving terminal for enabling ofdm system, ofdm system must be realized
Accurately and reliably time synchronized between transmitting terminal and receiving terminal.Simultaneously as ofdm system is very sensitive to the frequency deviation of carrier wave,
The receiving terminal of ofdm system it is also required to provide the carrier spectrum method of estimation of precise and high efficiency, accurately to be estimated to carrier wave frequency deviation
Meter and correction.
At present, realize the synchronous method of transmitting terminal and destination time substantially based on leading symbol come real in ofdm system
Existing.Leading symbol is all known symbol sebolic addressing of transmitting terminal and receiving terminal of ofdm system, and leading symbol is as physical frame
Start (being named as P1 symbols), a P1 symbol only occur in each physics frame in or multiple P1 symbols continuously occur, it indicates
The beginning of the physical frame.The purposes of P1 symbols is included：
1) make receiving terminal rapidly detect to determine that whether transmit in channel is to expect the signal for receiving；
2) basic configured transmission (such as FFT points, frame type information etc.) is provided, so that receiving terminal can carry out rear continued access
Receipts process；
3) original carrier frequency deviation and timing error are detected, frequency and Timing Synchronization after compensating, is reached；
4) emergency alarm or broadcast system wake up.
The P1 Design of Symbols based on CAB spatial structures is proposed in DVB_T2 standards, above-mentioned functions are preferably realized.But
It is on low complex degree receiving algorithm, still have some to limit to.For example, in the long multipath letter of 1024,542 or 482 symbols
During road, it is timed using CAB structures and relatively large deviation can occurs synchronously slightly, causes on frequency domain, to estimate that carrier wave integer frequency offset occurs
Mistake.In addition, in complex frequency Selective Fading Channel, such as, during long multipath, DBPSK differential decodings are likely to fail.
No Cyclic Prefix in DVB_T2 spatial structures is additionally, since, and if needing to carry out the frequency-domain structure combination of channel estimation, general
Cause the problem of its channel estimation in frequency domain performance degradation.
The content of the invention
During the problem that the present invention is solved is current DVB_T2 standards and other standards, without circulation in DVB_T2 spatial structures
Prefix, it is impossible to receive and calculate suitable for relevant detection, and leading symbol low complex degree under complex frequency Selective Fading Channel
There is the problem of probability of failure in method detection.
To solve the above problems, a kind of generation method of leading symbol in physical frame is embodiments provided, including
Following steps：The frequency-domain OFDM symbol of predetermined length is made inverse discrete fourier transform to obtain time-domain OFDM symbol；From described
Time-domain OFDM symbol intercepts the time-domain OFDM symbol of circulating prefix-length as Cyclic Prefix；The circulation based on above-mentioned intercepting
The time-domain OFDM symbol of prefix length generates modulated signal；Based on the Cyclic Prefix, the time-domain OFDM symbol and the tune
Signal generation leading symbol processed.
Optionally, the time-domain OFDM symbol of circulating prefix-length is being intercepted from the time-domain OFDM symbol as Cyclic Prefix
Also include before：The various combination of the circulating prefix-length and modulated signal length is selected, so that the leading character for ultimately forming
Signaling information is transmitted number by above-mentioned various combination.
Optionally, the various combination for selecting the circulating prefix-length and modulated signal length, in the time domain
Signaling information is transmitted in OFDM symbol to be included：It is determined that the bit number N transmitted by signaling information；Choose 2NIndividual circulating prefix-length
With the various combination of modulated signal length so that the leading symbol for ultimately forming pass through above-mentioned 2NIndividual various combination is transmitting signaling
Information..
Optionally, the time-domain OFDM symbol of circulating prefix-length is being intercepted from the time-domain OFDM symbol as Cyclic Prefix
Also include before：
Determine the combination of a kind of circulating prefix-length and modulated signal length；
In the time-domain OFDM symbol for intercepting the circulating prefix-length, different original positions are selected to intercept the modulation
The time-domain OFDM symbol of signal length producing modulated signal so that the leading symbol for ultimately forming is by the different starting
Position is transmitting signaling information.
Optionally, the signaling information includes emergency alarm or broadcast system mark EAS_flag, transmitter flag information
TXID, hook information or other configured transmissions.
Optionally, make inverse discrete fourier transform to obtain time domain OFDM in the frequency-domain OFDM symbol to predetermined length
Also comprise the steps before symbol：
Determine the average power ratio of fixed sequence program and signaling sequence；
Fixed sequence program and signaling sequence are generated on frequency domain respectively according to the average power ratio；
Fixed sequence program and signaling sequence are filled to effective subcarrier, and between the fixed sequence program and signaling sequence is in
Oem character set is arranged；
Fill null sequence subcarrier respectively to form the frequency-domain OFDM symbol of predetermined length in effective subcarrier both sides.
Optionally, the fixed sequence program is identical with the mean power of signaling sequence or different.
Optionally, the power ratio of the fixed sequence program and signaling sequence is 1：1 or 3：2 or 2:1 or 3：1.
Compared with prior art, technical solution of the present invention has the advantages that：
In the physical frame for providing according to embodiments of the present invention, the generation method of leading symbol, true according to different channel circumstances
Determine circulating prefix-length, and before intercepting the time-domain OFDM symbol of the circulating prefix-length as circulation from time-domain OFDM symbol
Sew, so as to solve the problems, such as channel estimation in frequency domain hydraulic performance decline.And the circulating prefix-length based on above-mentioned intercepting
Time-domain OFDM symbol generates modulated signal so that there is the leading symbol of generation good fractional part of frequency offset to estimate performance and timing
Net synchronization capability.
Further, by selection circulating prefix-length and the various combination of modulated signal length, so as to ultimately form
Leading symbol transmits signaling information by above-mentioned various combination；Or determine a kind of circulating prefix-length and modulated signal
The combination of length, and in the time-domain OFDM symbol for intercepting the circulating prefix-length, select different original positions to intercept
The time-domain OFDM symbol of the modulated signal length producing modulated signal so that the leading symbol for ultimately forming is by the difference
Original position transmitting signaling information.
Further, by the use of the modulated signal of time-domain OFDM symbol and the structure of time-domain OFDM symbol (as leading character
Number) ensure that the peak value that may be significantly using delay correlation in receiving terminal.Also, during the leading symbol is generated,
The modulated signal of design time-domain OFDM symbol can avoid receiving terminal from being subject to continuous wave CO_2 laser or mono-tone interference, or occur with
Occur when in the isometric multipath channel of modulated signal length, or reception signal, protection interval length is identical with modulated signal length
Error detection peak value.
Description of the drawings
Fig. 1 is that the flow process of the specific embodiment of the generation method of leading symbol in a kind of physical frame of the invention is illustrated
Figure；
Fig. 2 is that the CAB structures of the leading symbol generated using the generation method of leading symbol in the physical frame shown in Fig. 1 are shown
It is intended to；
Fig. 3 A are the CAB knots of the leading symbol of a kind of transmission emergency alarm of the present invention or broadcast system mark EAS_flag
Structure schematic diagram；
Fig. 3 B are the CAB of the leading symbol of another kind of transmission emergency alarm of the present invention or broadcast system mark EAS_flag
Structural representation；
Fig. 4 be the present invention a kind of physical frame in leading symbol generation method in generate frequency-domain OFDM symbol concrete reality
Apply the schematic flow sheet of mode.
Specific embodiment
During inventor has found current DVB_T2 standards and other standards, no Cyclic Prefix in DVB_T2 spatial structures, and
And there is the problem of probability of failure in leading symbol low complex degree receiving algorithm detection under frequency selective fading channels.
For the problems referred to above, inventor is through research, there is provided the generation method of leading symbol in a kind of physical frame.When
Cyclic Prefix is provided with domain structure, channel estimation in frequency domain hydraulic performance decline is solved the problems, such as, using the Cyclic Prefix part
All or part of data segment generates modulated signal so that the leading symbol of generation has good little frequency deviation and Timing Synchronization
Energy.
By the various combination for selecting the circulating prefix-length and modulated signal length, so that the leading character for ultimately forming
Signaling information is transmitted number by above-mentioned various combination；Or determine a kind of circulating prefix-length and modulated signal length
Combination, and in the time-domain OFDM symbol for intercepting the circulating prefix-length, select different original positions to intercept the modulation
The time-domain OFDM symbol of signal length producing modulated signal so that the leading symbol for ultimately forming is by the different starting
Position is transmitting signaling information.
Further, it is ensured that carrier frequency offset receiving terminal in the range of the -500kHz to 500kHz can still be processed and be connect
The collection of letters number.
It is understandable to enable the above objects, features and advantages of the present invention to become apparent from, below in conjunction with the accompanying drawings to the present invention
Specific embodiment be described in detail.
As shown in Fig. 1 in a kind of physical frame of the invention the specific embodiment of the generation method of leading symbol stream
Journey schematic diagram.With reference to Fig. 1, in physical frame, the generation method of leading symbol comprises the steps：
Step S15：The frequency-domain OFDM symbol of predetermined length is made inverse discrete fourier transform to obtain time-domain OFDM symbol；
Step S16：The time-domain OFDM symbol of circulating prefix-length is intercepted as Cyclic Prefix from the time-domain OFDM symbol；
Step S17：Modulated signal is generated based on the time-domain OFDM symbol of the circulating prefix-length of above-mentioned intercepting；
Step S18：Leading symbol is generated based on the Cyclic Prefix, the time-domain OFDM symbol and the modulated signal.
In the present embodiment, as described in step S15, inverse discrete fourier transform is made to the frequency-domain OFDM symbol of predetermined length
To obtain time-domain OFDM symbol.
Inverse discrete fourier transform described in this step is the conventional mode that frequency-region signal is converted into time-domain signal,
It will not go into details for this.
P1_XiTime-domain OFDM symbol is obtained after making inverse discrete fourier transform：
Wherein, M is the number of effective non-zero sub-carriers.
As described in step S16, the time-domain OFDM symbol of circulating prefix-length is intercepted as following from the time-domain OFDM symbol
Ring prefix.
In the present embodiment, the circulating prefix-length is equal to or less than the predetermined length.With the predetermined length
As a example by 1024, the circulating prefix-length can be 1024 or be less than 1024.Preferably, the circulating prefix-length is
512, the latter half (length is 512) of the time-domain OFDM symbol is generally intercepted as Cyclic Prefix, so as to solve frequency domain letter
Estimate the problem of hydraulic performance decline in road.
Wherein, it is described to determine that circulating prefix-length is many path lengths that antagonism is generally needed according to wireless broadcast communication system
Degree, system can obtain the bit that the minimum length and spatial structure of robust correlation peak transmits signaling in minimum threshold level
Any one or more factor in number is determining.If only needing to transmit signaling in frequency-domain structure, and spatial structure being fixed and nothing
Signaling need to be transmitted, then only needs to consider that the multipalh length for needing antagonism, system can obtain robust relevant peaks in minimum threshold level
One of minimum length of value or two.Generally, the length of Cyclic Prefix is longer, and the performance for resisting long multipath is better, and
The length and modulated signal length of Cyclic Prefix is longer, and which postpones related peak value and gets over robust.Generally, the length of Cyclic Prefix and
Modulated signal length need to be more than or equal to the minimum length that system can obtain robust correlation peak in minimum threshold level.
As described in step S17, modulation letter is generated based on the time-domain OFDM symbol of the circulating prefix-length of above-mentioned intercepting
Number.In practice, modulated signal length is typically without departing from the length of Cyclic Prefix part.
Specifically, this step includes：
1) a frequency deviation sequence is set；
2) by the time domain OFDM of the time-domain OFDM symbol of the circulating prefix-length or part circulating prefix-length
Symbol is multiplied by the frequency deviation sequence to obtain the modulated signal.
For example, if NcpFor the circulating prefix-length for determining, LenBFor modulated signal length.Modulated signal length is existed by system
The minimum length of robust correlation peak can be obtained to determine during minimum threshold level.Generally modulated signal length is more than or equal to this most
Little length.If NAFor the length of time-domain OFDM symbol, if sampled point serial number 0,1 ... the N of time-domain OFDM symbolA- 1. set N1 as
Selection is copied to the sampled point sequence number of the corresponding time-domain OFDM symbol of starting point of modulated signal section, and N2 modulates letter to select to be copied to
The corresponding time-domain OFDM symbol sampled point sequence number of terminal of number section.Wherein,
N2=N1+LenB-1
For the ease of description, time-domain OFDM symbol is divided into into 2 parts, first paragraph is not intercept the part as Cyclic Prefix
Time-domain OFDM symbol (is generally the front portion of the time-domain OFDM symbol), and second segment is to intercept the part time domain as Cyclic Prefix
OFDM symbol (is generally the rear portion of the time-domain OFDM symbol).If intercepting time-domain OFDM symbol all as Cyclic Prefix, the
One section of length is 0.N1 necessarily falls in second segment, that is, select to the scope of the part time-domain OFDM symbol of modulated signal section
Without departing from the scope of the part time-domain OFDM symbol intercepted as Cyclic Prefix.
Modulated signal part, Cyclic Prefix part are identical with a part of information in time-domain OFDM symbol.Wherein, modulation letter
Number part is only to have modulated frequency deviation or other signals, therefore can utilize the correlation of modulated signal part and Cyclic Prefix part
And the correlation of modulated signal part and time-domain OFDM symbol is doing Timing Synchronization and little inclined estimation.In practice, modulation letter
Number length is usually no more than circulating prefix-length.If modulated signal length is more than circulating prefix-length, the part for exceeding will increase
The expense of adding system, causes the decline of efficiency of transmission, and it to be only capable of enhanced modulation signal section related to time-domain OFDM symbol
The robustness of value, under the expense for maintaining like, this partial-length should increase to Cyclic Prefix part, and it will bring more
Performance benefits.
As shown in Fig. 2 A segment tables show time-domain OFDM symbol, C segment tables show Cyclic Prefix, and B segment tables show modulated signal.The frequency deviation
Sequence isWherein fSHThe corresponding subcarrier in frequency domain of time-domain OFDM symbol can be chosen for and be spaced (i.e. 1/
NAT), wherein T be the sampling period, NAFor the length of time-domain OFDM symbol.In this example, NAFor 1024, f is takenSH=1/1024T.
In other instances, in order that correlation peak is sharp, fSHCan also select as 1/ (LenBT).Work as LenB=NCPWhen, fSH=1/
NCPT.Such as LenB=NCPWhen=512, fSH=1/512T.
In other embodiments, M (t) can also be designed to other sequences, the such as window sequence of m-sequence or some simplification
Deng.
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 multiplied by frequency deviation sequence M (t) to obtain, i.e., P1_B (t) is：
Wherein, N1 is to select to be copied to modulated signal section
The sampled point sequence number of the corresponding time-domain OFDM symbol of starting point.
As described in step S18, generated based on the Cyclic Prefix, the time-domain OFDM symbol and the modulated signal leading
Symbol.
Specifically, the Cyclic Prefix is spliced in the front portion of the time-domain OFDM symbol as protection interval, and by institute
State modulated signal to splice at the rear portion of the OFDM symbol as frequency modulation sequence to generate leading symbol, as shown in Figure 2.
For example, leading symbol can be according to the following time-domain expression of employing：
In a preferred embodiment, the predetermined length NA=1024；NcpFor the half of the predetermined length, that is, work as NA
When=1024, Ncp=512.
When signaling need not be transmitted with the spatial structure of the leading symbol, when modulated signal is produced, one is only taken admittedly
Fixed starting point.Preferably, Len is setB=NcpAnd N1=NA-Ncp, i.e.,
Work as NA=1024, NcpWhen=512, LenB=512, N1=512.
Further, in the present embodiment, also by generating different Cyclic Prefix and modulated signal, so that most end form
Into leading symbol it is also different, so as to during leading symbol of the receiving terminal in the physical frame that receives of demodulation, can make to prolong to which
Related operation, and the design parameter of the delays different according to setting is attempted, wherein length of delay only matching leading symbol late, ability
Obvious correlation peak is obtained, different leading symbols are distinguished with this, to reach the spatial structure transmission letter in leading symbol
Make the purpose of information.
One instantiation was also comprised the steps before step S16：Select the circulating prefix-length and
The various combination of modulated signal length, so that the leading symbol for ultimately forming transmits signaling information by above-mentioned various combination.
Specifically, the step includes：
1) determine the bit number N transmitted by signaling information；
2) 2 are chosenNThe various combination of individual circulating prefix-length and modulated signal length, so that the leading symbol for ultimately forming
By above-mentioned 2NIndividual various combination is transmitting signaling information.
In practice, some signaling informations (such as emergency alarm or broadcast system mark EAS_flag) only need to 1 bit,
Some signaling informations (such as transmitter flag information TXID) need 4 bits.Therefore, according to the bit transmitted by signaling information
Count (being set to N) to determine the various combination of circulating prefix-length and modulated signal length, the total number of its various combination is 2N。
With the signaling information of transmission as emergency alarm or as a example by broadcast system mark EAS_flag.
For example, the EAS flag of 1 bit are transmitted.If predetermined length be 1024 OFDM symbol sampled point serial number 0,
1、…、1023.If NcpFor the circulating prefix-length for determining, LenBFor modulated signal length.If NAFor the length of time-domain OFDM symbol
Degree.
If EAS is flag=0, N is takencp=LenB=512；NACorresponding serial number 512 for 1024 OFDM symbol～
1023 sampled point is copied to C as Cyclic Prefix, NACorresponding serial number 512～1023 for 1024 OFDM symbol is adopted
B is generated after sampling point frequency modulation sequence, the rear portion of A is put into.
If EAS is flag=1, N is takenCP=512+K；LenB=512-K；NAFor the corresponding sequence number of 1024 OFDM symbol
Sampled point for 512-K～1023 is copied to C as Cyclic Prefix, NAFor corresponding serial number 512+ of 1024 OFDM symbol
B is generated after the sampled point frequency modulation sequence of K～1023, the rear portion of A is put into.
Preferably, can use Nc=NA/ 2+K, Nb=NA/2-K；By selecting 2NIndividual different K carrys out the signaling of transmission of n-bit
Information.
Is that a kind of CAB structures of the leading symbol of transmission emergency broadcast system mark EAS_flag are shown with reference to shown in Fig. 3 A
It is intended to.Wherein, the value of K is 0 (correspondence EAS_flag=0) and 16 (correspondence EAS_flag=1).
Time-domain expression is：
If EAS_flag=1
If EAS_flag=0
The frequency deviation sequence isWherein fSHCorresponding frequency domain of time-domain OFDM symbol can be chosen for carry
Wave spacing is 1/NAT, wherein T be the sampling period, NAFor the length of time-domain OFDM symbol, in this example, NAFor 1024, f is takenSH=
1/1024T。
Another instantiation was also comprised the steps before step S16：
Determine the combination of a kind of circulating prefix-length and modulated signal length；
In the time-domain OFDM symbol for intercepting the circulating prefix-length, different original positions are selected to intercept the modulation
The time-domain OFDM symbol of signal length producing modulated signal so that the leading symbol for ultimately forming is by the different starting
Position is transmitting signaling information.
With the signaling information of transmission as emergency alarm or as a example by broadcast system mark EAS_flag.
For example, the predetermined length is 1024, NCPFor 512+K, LenBFor 512-K, the length of whole leading symbol is
2048, wherein frequency modulation value fSH=1/1024T, is represented for transmitting 1 bit signalling by selecting different original positions N1
Emergency alarm or broadcast system mark EAS_flag.
If EAS_flag=1, N1=512-L is taken, i.e., NACorresponding serial number 512-L for 1024 OFDM symbol～
B is generated after the sampled point frequency modulation sequence of 1023-2L, the rear portion of A is put into.
If EAS_flag=0, N1=512+L is taken, i.e., NACorresponding serial number 512+L for 1024 OFDM symbol～
B is generated after 1023 sampled point frequency modulation sequence, the rear portion of A is put into.
Is the leading symbol that another kind of transmission emergency alarm or broadcast system identify EAS_flag with reference to shown in Fig. 3 B
CAB structural representations.Wherein, the value of L is 8.
Time-domain expression is：
If EAS_flag=1
If EAS_flag=0
Again for example, the predetermined length is 1024, NCPFor 512+15*L, LenBFor 512, N1 desirable 512+i*L, 0≤i ＜
16, then can represent 16 kinds it is different follow the example of, transmit 4bit signaling informations.For example, different transmitters can be different by taking
N1 can also change N1 to send transmission by timesharing transmitting corresponding mark TXID of the transmitter, same transmitter
Parameter.Preferably, L takes 16.
Again for example, the predetermined length is 1024, NCPFor 512+7*L, LenBFor 512, N1 desirable 512+i*L, 0≤i ＜
7, transmit 3bit signaling informations.Preferably, L takes 16.
Further, frequency-domain OFDM symbol is generated in a kind of physical frame with reference to shown in Fig. 4 in the generation method of leading symbol
Number specific embodiment schematic flow sheet.
Specifically, also comprised the steps before step S15 in the schematic flow sheet shown in above-mentioned Fig. 1：
Step S11：Determine the average power ratio of fixed sequence program and signaling sequence；
Step S12：Fixed sequence program and signaling sequence are generated on frequency domain respectively according to the average power ratio；
Step S13：Fixed sequence program and signaling sequence are filled to effective subcarrier, and the fixed sequence program and signaling sequence
Arrange in oem character set between row；
Step S14：Fill null sequence subcarrier respectively to form the frequency domain of predetermined length in effective subcarrier both sides
OFDM symbol.
Specifically, as described in step S11, determine the average power ratio of fixed sequence program and signaling sequence.Wherein, it is described solid
Sequencing arranges and can be used to do the relevant information of carrier frequency synchronization and Timing Synchronization, the signaling sequence including receiving terminal and include each
Basic configured transmission.
In the present embodiment, the fixed sequence program and signaling sequence are permanent mode sequence, and fixed sequence program and signaling sequence
In each plural mould it is all equal.It should be noted that the plural number includes real number (i.e. plural imaginary part is zero).So, believe
Make sequence identical with the mean power of fixed sequence program.
In other embodiments, the mean power of fixed sequence program and signaling sequence can be the same or different, can basis
Practical application request is adjusted, and selects the power for increasing fixed sequence program obtaining more preferable channel estimation and whole inclined estimation performance, or
Person selects the power for increasing signaling sequence improving the actual signal to noise ratio on signaling carrier to improve signaling decoding performance.Therefore,
The average power ratio of fixed sequence program and signaling sequence is according to whole inclined estimation performance, channel estimating performance, solution signaling performance and determines
When net synchronization capability balanced consideration and determine.In the present embodiment, the average power ratio of the fixed sequence program and signaling sequence can
Think 1：1 or 3：2 or 2:1 or 3：1.When fixed sequence program length is identical with signaling sequence length, average power ratio is
For the ratio of power summation.
It is determined that after average power ratio, being just accordingly fixed the Amplitude Ration of sequence and signaling sequence.Work as average power ratio
For 2:1, and fixed sequence program and signaling sequence, when being permanent mode sequence, the Amplitude Ration of corresponding fixed sequence program and signaling sequence is
As described in step S12, fixed sequence program and signaling sequence are generated on frequency domain respectively according to the average power ratio.
In the present embodiment, generate on frequency domain signaling sequence can with using any one in the following two kinds mode, below
Describe both concrete modes for generating signaling sequence in detail.
Mode 1：
1.1 length, number and the amplitudes for determining signaling sequence；
1.2 length based on the signaling sequence and number determine that CAZAC sequences generate the root values in formula；Wherein,
The length of signaling sequence is less than or equal to root values, and root values more than or equal to the twice of the number of signaling sequence.It is excellent
Selection of land, root values are chosen for the length of signaling sequence.
For example, sequence length L and signaling number are determined.Such as, N number of bit to be passed, then signaling number num is 2NAnd select
Select the root values that CAZAC sequences generate exp (j π qn (n+1)/root) in formula.Wherein, sequence length L is less than or equal to
Root values, and root values are greater than equal to 2*num.Generally root values are prime number.
The different q values generation CAZAC sequences of 1.3 selections, wherein number of the number of q values equal to signaling sequence, and arbitrarily
Two q value sums are not equal to root values；And produced CAZAC sequences are needed through cyclic shift, the digit of cyclic shift by
Corresponding root values and q values are determined.
For example, select num different q0、q1、……、qnum-1Produce CAZAC sequences：
S (n)=exp (j π qn (n+1)/root), n=0 ... root-1.
Sequence after cyclic shift is：
sk(n)=[s (k), s (k+1) ..., s (L-1), s (0) ..., s (k-1)]
Wherein, k is the digit of cyclic shift.
It should be noted that in the present embodiment, the q for selectingi(0≤i≤num-1) must is fulfilled for following conditions：Any 2
Individual qi、qj(0≤i, j≤num-1) meets qi+qj≠root.
Under these conditions, prioritizing selection causes the low sequences of overall frequency-domain OFDM symbol PAPR.And if L is more than or equal to
The autocorrelation value of the such sequence of 2*num, prioritizing selection root=L. is zero.
1.4 numbers of signaling sequence according to determined by choose the signaling sequence from all of CAZAC sequences.Need
Illustrate, if L=root, need not intercept, resulting CAZAC sequences can be used as signaling sequence.
For example, using each sequence truncation length in num sequence for L continuous part sequence or full sequence as
Signaling sequence.
For example, signaling sequence length L=353, quantity num=128, then it is immediate prime number that root may be selected
353.The span of q is 1～352, and the span of each sequence cyclic shift digit is 1～353.In all optional letters
In making sequence, preferably go out following 128 groups, its q value and cyclic shift position difference are as shown in the table：
Q value value forms
Cyclic shift digit form
| 105 | 244 | 172 | 249 | 280 | 251 | 293 | 234 | 178 | 11 | 63 | 217 | 83 | 111 | 282 |
| 57 | 85 | 134 | 190 | 190 | 99 | 180 | 38 | 191 | 22 | 254 | 186 | 308 | 178 | 251 |
| 277 | 261 | 44 | 271 | 265 | 298 | 328 | 282 | 155 | 284 | 303 | 113 | 315 | 299 | 166 |
| 342 | 133 | 115 | 225 | 13 | 26 | 326 | 148 | 195 | 145 | 185 | 121 | 58 | 162 | 118 |
| 151 | 182 | 230 | 39 | 249 | 305 | 309 | 144 | 188 | 181 | 265 | 140 | 212 | 137 | 10 |
| 298 | 122 | 281 | 181 | 267 | 178 | 187 | 177 | 352 | 4 | 353 | 269 | 38 | 342 | 288 |
| 277 | 88 | 124 | 120 | 162 | 204 | 174 | 294 | 166 | 157 | 56 | 334 | 110 | 183 | 131 |
| 171 | 166 | 321 | 96 | 37 | 261 | 155 | 34 | 149 | 156 | 267 | 332 | 93 | 348 | 300 |
| 245 | 101 | 186 | 117 | 329 | 352 | 215 | 55 |
According to above-mentioned known signaling sequence, a preferably fixed sequence program is calculated, such as following formula is represented：
Wherein, ωnValue it is as shown in the table by rows from left to right in order：
The amplitude of fixed sequence program and signaling sequence is determined according to average power ratio.For example, if fixed sequence program and signaling sequence
Average power ratio be 1：1, in above-described embodiment, fixed sequence program and signaling sequence modulus value are 1, and length is identical, meets power
Compare demand.Again for example, in other embodiments, if the average power ratio of fixed sequence program and signaling sequence is 2：1, if fixed sequence program
With signaling sequence perseverance mould, it is assumed that the amplitude of fixed sequence program is 1, then the amplitude of signaling sequence is
Mode 2：
2.1 length, number and the amplitudes for determining signaling sequence；
2.2 length based on the signaling sequence and number determine that CAZAC sequences generate several root values in formula；Its
In, the length of signaling sequence less than or equal to the minima in selected several root values, and it is selected several
Twice of the root values sum more than or equal to the number of signaling sequence.Preferably, root values are chosen for the length of signaling sequence.
For example, sequence length L and signaling number are determined.Such as, N number of bit to be passed, then signaling number num is 2N, and select
Select some K root that CAZAC sequences generate exp (j π qn (n+1)/root) in formulak(0≤k≤K-1).Wherein, signaling sequence
Row length L is less than or equal to all rootkIn minima, and several rootkAnd be more than or equal to 2*num, i.e.,Generally rootkIt is worth for prime number.
2.3 are directed to each root value, select different q values generation CAZAC sequences, wherein the number of q values less than or
Equal to the 1/2 of corresponding root values, and any two q value sum is not equal to corresponding root values；And produced CAZAC sequences
Row are needed through cyclic shift, and the digit of cyclic shift is determined by corresponding root values and q values.
For example, for each rootk(0≤k≤K-1), selects numkIndividual different q0、q1、Produce CAZAC sequences
Row exp (j π qn (n+1)/rootk), n=0 ... rootk-1.Wherein,
And
In the manner 2, for each root value, different q values are selected to produce CAZAC sequences, and it is produced
CAZAC sequences need the mode through cyclic shift to be referred to the description of aforesaid way 1, will not be described here.
It should be noted that in the present embodiment, the q for selectingi(0≤i≤numk- 1) following conditions must are fulfilled for：Any 2
Individual qi、qj(0≤i,j≤numk- 1) meet qi+qj≠rootk。
Under these conditions, prioritizing selection causes the low sequences of overall frequency-domain OFDM symbol PAPR.And can prioritizing selection its
In a root=L.The autocorrelation value of so sequence that the root is produced is zero.
2.4 numbers of signaling sequence according to determined by choose the signaling sequence from each the CAZAC sequence for obtaining
Row.If it is emphasized that wherein certain root=L, produced according to the root values of the length for being chosen for signaling sequence
CAZAC sequences determine the signaling sequence.
For example, using each sequence truncation length in num sequence for L continuous part sequence or full sequence as
Signaling sequence.
For example, for example, L=353, num=128.It is 353 by 1 prioritizing selection root of mode.Then, q=1 is selected,
2,…128.Meet qi+qj≠353,(0≤i,j≤128-1).Finally, by each sequence truncation to length be 353.
Again for example, L=350, num=256.It is 353, root2=359 that root1 is selected by mode 2, then for root1
=353, select q=1,2,3 ... 128 totally 128 sequences, qi+qj≠353.Then root2=359 is directed to, q=100 is selected,
101,102 ... 227 totally 128 sequences, altogether 256 sequences..Finally by each sequence truncation to length be 353.
The amplitude of fixed sequence program and signaling sequence is determined according to average power ratio.For example, if fixed sequence program and signaling sequence
Average power ratio be 1：1, in above-described embodiment, fixed sequence program and signaling sequence modulus value are 1, and length is identical, meets power
Compare demand.Again for example, in other embodiment, if the average power ratio of fixed sequence program and signaling sequence is 2：1, if fixed sequence program and
Signaling sequence perseverance mould, it is assumed that the amplitude of fixed sequence program is 1, then the amplitude of signaling sequence is
In addition, in other examples, if the impermanent mould of fixed sequence program and signaling sequence, amplitude coefficient calculates more multiple
It is miscellaneous, but average power ratio demand can be realized, repeat no more here.
As described in step S13, the fixed sequence program and signaling sequence are filled to effective subcarrier, and the fixed sequence program
Arrange in oem character set and signaling sequence between.
In one preferred embodiment, the equal length of the length of the fixed sequence program and the signaling sequence, and
The length less than the predetermined length 1/2.Wherein, the predetermined length be can also be according to being in 1024, but practical application
System demand and change.
So that predetermined length is 1024 as an example, if the length of fixed sequence program is N (carries effective subcarrier of 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
Strange subcarrier) on position, correspondingly, signaling sequence is filled to strange subcarrier (or even subcarrier) position, so as in frequency domain
The distribution of fixed sequence program and signaling sequence oem character set arrangement is presented on subcarrier effectively.It should be noted that when fixation
(such as M when the length of sequence and signaling sequence is inconsistent>N), can realize fixing by way of zero padding sequence subcarrier
Sequence and the arrangement of signaling sequence oem character set.
As described in step S14, fill null sequence subcarrier respectively to form predetermined length in effective subcarrier both sides
Frequency-domain OFDM symbol.
In a preferred embodiment, this step includes：The zero of equal length is filled respectively in effective subcarrier both sides
Sequence subcarrier is forming the frequency-domain OFDM symbol of predetermined length.
Along to the example that predetermined length is 1024, the G=1024-M-N of the length of null sequence subcarrier, both sides filling
(1024-M-N)/2 null sequence subcarriers.
Further, in order to ensure that receiving terminal can still be located in the range of -500kHz to 500kHz in carrier frequency offset
Reason receives signal, and (1024-M-N)/2 value is typically larger than critical length value (being set to TH), and the critical length value is by system symbol
Rate and predetermined length are determining.For example, predetermined length is the system symbol rate of 1024,7.61M, the sample rate of 9.14M, thenFor example, M=N=353, then G=318, both sides are respectively filled
159 null sequence subcarriers.
Therefore, subcarrier (the i.e. frequency-domain OFDM symbol) P1_X of predetermined length (1024)0,P1_X1,…,P1_X1023By
In the following manner filling is generated：
Wherein, fixed sequence program subcarrierSignaling sequence subcarrierResiding odd even position can exchange.
Although the present invention is disclosed as above with preferred embodiment, which is not for limiting the present invention, any this area
Technical staff without departing from the spirit and scope of the present invention, may be by the methods and techniques content of the disclosure above to this
Bright technical scheme makes possible variation and modification, therefore, every content without departing from technical solution of the present invention, according to the present invention
Technical spirit any simple modification, equivalent variations and modification that above example is made, belong to technical solution of the present invention
Protection domain.
Claims (10)
1. a kind of generation method of frequency-domain OFDM symbol, it is characterised in that make in the frequency-domain OFDM symbol to predetermined length
Inverse discrete fourier transform is also comprising the steps before obtaining time-domain OFDM symbol：
Determine the average power ratio of fixed sequence program and signaling sequence；
Fixed sequence program and signaling sequence are generated on frequency domain respectively according to the average power ratio；
Fixed sequence program and signaling sequence are filled to effective subcarrier, and is in odd even between the fixed sequence program and signaling sequence
It is staggered；
Fill null sequence subcarrier respectively to form the frequency-domain OFDM symbol of predetermined length in effective subcarrier both sides.
2. the generation method of frequency-domain OFDM symbol as claimed in claim 1, it is characterised in that signaling sequence is generated on frequency domain
Including：
Determine length, number and the amplitude of signaling sequence；
Length and number based on the signaling sequence determines that CAZAC sequences generate the root values in formula；Wherein, signaling sequence
Length be less than or equal to root values, and root values be more than or equal to signaling sequence number twice；
Different q values are selected to produce CAZAC sequences, the wherein number of q values is equal to the number of signaling sequence, and any two q value
Sum is not equal to root values；And produced CAZAC sequences are needed through cyclic shift, the digit of cyclic shift is by corresponding
Root values and q values are determined；
The number of signaling sequence according to determined by chooses required signaling sequence from all of CAZAC sequences.
3. the generation method of frequency-domain OFDM symbol as claimed in claim 2, it is characterised in that the length of the signaling sequence is
353rd, the number of signaling sequence is that 128, root values are 353；
The value of q values is all numerical value in following form：
The digit of cyclic shift is all numerical value in following form：
4. the generation method of frequency-domain OFDM symbol as claimed in claim 1, it is characterised in that signaling sequence is generated on frequency domain
Including：
Determine length, number and the amplitude of signaling sequence；
Length and number based on the signaling sequence determines that CAZAC sequences generate several root values in formula；Wherein, signaling
The length of sequence less than or equal to the minima in selected several root values, and selected several root values it
With the twice of the number more than or equal to signaling sequence；
For each root value, different q values are selected to produce CAZAC sequences, wherein the number of q values is less than or equal to corresponding
Root values 1/2, and any two q value sum is not equal to corresponding root values；And produced CAZAC sequences need through
Cyclic shift, the digit of cyclic shift are determined by corresponding root values and q values；
The number of signaling sequence according to determined by chooses required signaling sequence from each the CAZAC sequence for obtaining.
5. the generation method of frequency-domain OFDM symbol as claimed in claim 4, it is characterised in that for each root value, choosing
The number for selecting q values is different, and the number summation of these q values is equal to the number of signaling sequence.
6. the generation method of frequency-domain OFDM symbol as claimed in claim 4, it is characterised in that in several root values
Root values are chosen for the length of signaling sequence.
7. the generation method of frequency-domain OFDM symbol as claimed in claim 6, it is characterised in that signaling determined by the basis
The length of sequence chooses the signaling sequence from each the CAZAC sequence for obtaining to be included：According to being chosen for signaling sequence
CAZAC sequences produced by the root values of length determine the signaling sequence.
8. the generation method of the frequency-domain OFDM symbol as described in claim 2 or 4, it is characterised in that the root values are prime number.
9. the generation method of frequency-domain OFDM symbol as claimed in claim 3, it is characterised in that the generation of the fixed sequence program is
It is calculated based on the signaling sequence for producing.
10. the generation method of frequency-domain OFDM symbol as claimed in claim 9, it is characterised in that the fixed sequence program is：
Wherein, ωnValue it is as shown in the table by rows from left to right in order：
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| KR20220093391A (en) | 2014-08-07 | 2022-07-05 | 코히어런트 로직스, 인코포레이티드 | Multi-partition radio frames |
| CN110266426B (en) | 2014-08-25 | 2021-03-05 | 第一媒体有限责任公司 | Dynamic configuration of flexible OFDM PHY Transmission data frame preamble |
| TWI809802B (en) | 2015-03-09 | 2023-07-21 | 美商第一媒體有限責任公司 | Communication systems, methods for wireless communication and transmitting devices |
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| CN109716682B (en) | 2016-04-07 | 2021-04-16 | 辛克莱广播集团公司 | Next generation terrestrial broadcast platform looking at the internet and moving towards emerging 5G network architectures |
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| CN106713208A (en) | 2017-05-24 |
| CN105323048B (en) | 2019-05-03 |
| CN106713208B (en) | 2020-04-17 |
| CN105323048A (en) | 2016-02-10 |
| CN110190938A (en) | 2019-08-30 |
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| CN110190938B (en) | 2022-07-12 |
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