CN104468445B - The generation method of leading symbol in next-generation radio and television wireless communication system - Google Patents
The generation method of leading symbol in next-generation radio and television wireless communication system Download PDFInfo
- Publication number
- CN104468445B CN104468445B CN201310447188.XA CN201310447188A CN104468445B CN 104468445 B CN104468445 B CN 104468445B CN 201310447188 A CN201310447188 A CN 201310447188A CN 104468445 B CN104468445 B CN 104468445B
- Authority
- CN
- China
- Prior art keywords
- mrow
- msub
- leading symbol
- leading
- sequence
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
-
- 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
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The present invention provides a kind of generation method of leading symbol in next-generation radio and television wireless communication system, including carrying out orthogonal modulation to leading signaling information；Leading symbol DBPSK modulation sequences are scrambled, obtain sequence after leading symbol scrambling：Sequence is placed on 768 effective subcarriers after leading symbol is scrambled, generation main part A；Main part be divided into two parts, pair and do frequency shift (FS) respectively, generate suffix and prefix, leading symbol finally generated by prefix, main part and suffix.The spatial structure of leading symbol of the present invention uses 4096 points of shift C A B structures, which utilizes former and later two frequency displacement repeating parts, realizes that receiving terminal quickly finds signal in time domain, and realizes OFDM symbol Timing Synchronization and fractional part of frequency offset estimation；Wherein, the signaling information of 12 bits on the one hand can be carried using 4096 points；On the other hand, with respect to 2048 points, sample points are on the high side, are conducive to the inhibition to noise in synchronized algorithm, improve net synchronization capability.
Description
Technical field
The present invention relates to the technical fields of mobile communication, particularly, it is wireless to be related to a kind of next-generation radio and television（Next
Generation Broadcast Wireless, NGB-W）The generation method of leading symbol in communication system.
Background technology
With the fast development of world economy culture, mobile subscriber is to the demand rapid growth of information service.Individually according to
By traditional broadcast net or traditional bi-directional communication network, the optimization transmission of mobile message business can not be all realized.And next-generation broadcast
Tv wireless (NGB-W) communication system is to solve mobile message business, it can be achieved that the amalgamation and coexistence of radio broadcasting and two-way communication
The effective way of contradiction between data volume rapid growth and wireless network transmissions capacity are limited.
Mobile communication system, the normal work of broadcast system all be unable to do without leading symbol information.Leading symbol information is being received
Both ends are sent out it is known that transmitting terminal sends leading symbol information, receiving terminal can realize system signal by receiving the preface information
Detection identification.If detecting that the system signal exists, the initial synchronisation of time domain and small several times are carried out followed by preface information
Nonlinear Transformation in Frequency Offset Estimation, then carry out the detection of integer frequency offset estimation and related signaling, so as to obtain system some are basic
Parameter.After completing these initializations, communication system could enter normal information transfer process.
Leading symbol information is mainly used for the establishment stage of communication link, therefore the design of leading symbol should be conducive to connect
Receiving end finds and detects as early as possible signal and whether there is.Leading symbol should also make initial synchronization as far as possible simple, reliable.
Time domain shift-C-A-B structures have been continued to use in the design of leading symbol in NGB-W systems, however in view of NGB-W
System transfers 12 bit signalling information in leading symbol, while in view of the quick inspection of Time and Frequency Synchronization performance and initial signal
It surveys, it is desirable to provide a kind of design method of the leading symbol in new NGB-W systems.
The content of the invention
In view of the foregoing deficiencies of prior art, it is an object of the invention to provide a kind of next-generation radio and television are wireless
The generation method of leading symbol in communication system realizes detection identification, the Time and Frequency Synchronization of initial signal in NGB-W systems so that
NGB-W systems can quick obtaining basic system parameter, so as to for realize Time and Frequency Synchronization, establish communication link, carry out data biography
Defeated offer guarantee.
In order to achieve the above objects and other related objects, the present invention provides a kind of next-generation radio and television wireless communication system
The generation method of middle leading symbol, including at least following steps：
Orthogonal modulation is carried out to leading signaling information, wherein, leading signaling information includes S1 domains, the S2 for being 4 bits
Domain and S3 domains；The S1 domains, S2 domains and S3 domains are each mapped to the complementary orthogonal sequence that a length is 256, are expressed as
CSSS1、CSSS2、CSSS3, obtain leading signaling symbols orthogonal modulation sequences MSS_SEQ=[CSSS1,CSSS2,CSSS3]；
DBPSK modulation is done to leading signaling symbols orthogonal modulation sequences MSS_SEQ, obtains leading symbol DBPSK modulation sequences
Arrange MSS_DIFF：
Wherein, 0≤i≤767, and MSS_DIFF-1=1；
Leading symbol DBPSK modulation sequences MSS_DIFF is scrambled, obtains sequence MSS_SCR after leading symbol scrambling：
Wherein, 0≤i≤767；
Sequence MSS_SCR is placed on 768 effective subcarriers after leading symbol is scrambled, generation main part A；
It is two parts of C' and B' that main part A, which is divided to, does frequency shift (FS) respectively to B' and C', generates suffix B and prefix C,
Leading symbol is finally generated by prefix C, main part A and suffix B.
According to the generation method of leading symbol in above-mentioned next-generation radio and television wireless communication system, wherein：To leading
When symbol DBPSK modulation sequences MSS_DIFF is scrambled, scrambler sequence uses preceding 768 bit of PRBS Sequence maker generation.
Further, according to the generation method of leading symbol in above-mentioned next-generation radio and television wireless communication system,
In：The PRBS Sequence maker includes the shift register group that length is 15, the original state of the shift register group for '
0,0,0,1,0,1,1,1,0,0,1,0,1,1,0'；When generating scrambler sequence, with the arrival of each clock shift LD
Device group carries out displacement from left to right, leftmost 1 result by the 1st of shift register group and the 15th phase exclusive or into
Row filling.
According to the generation method of leading symbol in above-mentioned next-generation radio and television wireless communication system, wherein：1538
On a effective subcarrier after 768 subcarriers loading leading symbols scramblings of selection during sequence, selecting the principle of subcarrier is：Favorably
In receiving terminal integral multiple subcarrier offset estimation is carried out using energy measuring.
According to the generation method of leading symbol in above-mentioned next-generation radio and television wireless communication system, wherein：After generation
When sewing B and prefix C, B' and C' carry out frequency shift (FS) f respectivelySH, wherein fSH=Δ f, Δ f are subcarrier spacing.
According to the generation method of leading symbol in above-mentioned next-generation radio and television wireless communication system, wherein：Before described
The time domain waveform for leading the main part A of symbol is expressed as：
Wherein, MSS_SCRiIt is i-th of value of sequence after leading symbol scrambles；kiRepresent the location index of effective subcarrier；
NaIt is the quantity of effective subcarrier；TsIt is the sampling period of NGB-W systems.
Further, according to the generation method of leading symbol in above-mentioned next-generation radio and television wireless communication system,
In：The time domain waveform of the leading symbol entirety is expressed as：
As described above, the present invention next-generation radio and television wireless communication system in leading symbol generation method, have
Following advantageous effect：
（1）Before the spatial structure of leading symbol uses 4096 points of shift-C-A-B structures, the structure to utilize in the present invention
Latter two frequency displacement repeating part realizes that receiving terminal quickly finds signal in time domain, and realizes OFDM symbol Timing Synchronization and decimal
Times offset estimation；Wherein, the signaling information of 12 bits on the one hand can be carried using 4096 points；On the other hand, with respect to 2048 points,
Sample points are on the high side, are conducive to the inhibition to noise in synchronized algorithm, improve net synchronization capability；
（2）The leading symbol major function generated in the present invention includes：Time domain Timing Synchronization, the system decimal of system signal
The detection of times offset estimation, system integer frequency offset estimation, 12 bit signalling information；
For the timing estimation of OFDM symbol, under awgn channel, NGB-W system performances are slightly better than second generation Digital European
Ground TV broadcast transmission standard（Digital Video Broadcasting-Terrestrial2, DVB-T2）System；
Under TU6 channels, the two detector timing properties b is not much different；
For small several times Nonlinear Transformation in Frequency Offset Estimation, under awgn channel, TU6 static channels, NGB-W performances are better than DVB-
T2, the reason is that NGB-W system leading symbols are long, it is more for the points of phase calculation when carrying out fractional part of frequency offset estimation, favorably
It is averaged in noise, the influence of noise can be reduced；
For integral multiple carrier deviation estimation, NGB-W systems and DVB-T2 system performances are suitable；
The P1 symbols of DVB-T2 systems carry 7 bit S parameter information；The leading symbol of NGB-W systems carries 12 ratios
Special S parameter information.For S parameter testing result, under several different types of delay spread channels, NGB-W systems are better than
DVB-T2 systems, this is because NGB-W system carriers interval is smaller, intercarrier floating is small, and the performance of differential ference spiral is more preferable, difference
The result of demodulation and the result that local sequence does cross-correlation are more accurate；Meanwhile under awgn channel, NGB-W systems under low signal-to-noise ratio
System performance is also better than DVB-T2 systems, this is because NGB-W system fractional part of frequency offset estimated results are more accurate, after correction, residual
Inter-carrier interference smaller.
Description of the drawings
Fig. 1 is shown as the time domain waveform structure diagram of leading symbol in the present invention；
Fig. 2 is shown as the scrambling processes schematic diagram of leading symbol DBPSK modulation sequences in the present invention；
Fig. 3 is shown as y in the present inventionm,l,kExtremelyMap index relation schematic diagram；
Fig. 4 is shown as receiving the state diagram of signal relevant treatment in the present invention.
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also be based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under the spirit of the present invention.
It should be noted that the diagram provided in the present embodiment only illustrates the basic conception of the present invention in a schematic way,
Then in schema only display with it is of the invention in related component rather than component count, shape and size during according to actual implementation paint
System, kenel, quantity and the ratio of each component can be a kind of random change during actual implementation, and its assembly layout kenel also may be used
It can be increasingly complex.
Leading symbol mainly completes following functions：Firstth, leading symbol identifies for the system signal of receiving terminal, judges sky
In with the presence or absence of NGB-W signals, if detecting the presence of NGB-W system signals, receiving terminal utilizes leading symbol progress NGB-W
The Timing Synchronization of time-domain signal and small several times, integer frequency offset estimation；Secondth, leading symbol carries the leading signaling of 12 bits
Information, receiving terminal can obtain the relevant parameter information of NGB-W systems using the information.
It is of the invention in order to solve the transmission problem of the signal identification of NGB-W systems, initial synchronisation and system essential information
The time domain waveform of leading symbol in next-generation radio and television wireless communication system is made of three parts, including main part A,
Suffix B and prefix C.Wherein main part A includes 2K sampled point, is by 2K Fast Fourier Transform (FFT)s（Fast Fourier
Transform, FFT）The OFDM symbol of generation, main part A are divided into as two parts of C' and B', respectively including 1084 samplings
Point and 964 sampled points.It replicates B' and is subcarrier frequency displacement fSHSuffix B is generated, replicate C' and is subcarrier frequency displacement fSHBefore generation
Sew C, wherein fSH=Δ f, wherein Δ f are subcarrier spacing.Entire leading symbol includes 4096 sampled points.
Out-of-band power is excessive in order to prevent, interferes with other systems, and its in 2048 subcarriers is only used under 2K FFT
Middle a part of subcarrier transmission data, several subcarriers on system bandwidth both sides are without using transmitting this portion subcarriers of data
As effective subcarrier.In leading symbol, 768 subcarriers in 1538 effective subcarriers are used, for carrying 12
The leading signaling information of bit.The leading map signaling information of 12 bit is the bit sequence that length is 768, is modulated through DBPSK
And scrambling, it places to corresponding effectively subcarrier, then the OFDM symbol of 2K sampled points, i.e. main part is included through IFFT generations
A。
Specifically, in next-generation radio and television wireless communication system of the invention leading symbol generation method include it is following
Step：
Step S1：Orthogonal modulation is carried out to leading signaling information.
Leading signaling information is altogether comprising 12 bits, including S1 domains（4 bits）, S2 domains（4 bits）With S3 domains（4
Bit）.The complementary orthogonal sequence that the length that S1 domains, S2 domains and S3 domains are each mapped in orthogonal complement sequence sets is 256,
It is expressed as CSSS1、CSSS2、CSSS3, then leading signaling symbols orthogonal modulation sequences are MSS_SEQ=[CSSS1,CSSS2,
CSSS3]。
Wherein, S1 domains, the corresponding orthogonal sequence in S2 domains and S3 domains be such as
Shown in table 1.
Table 1S1 domains, S2 domains and the correspondence of S3 domains value and orthogonal sequence
Step S2：DBPSK modulation is done to leading signaling symbols orthogonal modulation sequences MSS_SEQ, obtains leading symbol DBPSK
Modulation sequence MSS_DIFF：
Wherein, 0≤i≤767, and MSS_DIFF-1=1。
Step S3：Leading symbol DBPSK modulation sequences MSS_DIFF is scrambled, obtains sequence MSS_ after leading symbol scrambling
SCR：
Wherein, 0≤i≤767.
Scrambling processes are as shown in Fig. 2, scrambler sequence type B error random binary sequence（Pseudo-Random Binary
Sequence, PRBS）Preceding 768 bit of maker（b0,BS…b767,BS）.PRBS Sequence maker is initialized as ' 0,0,0,
1,0,1,1,1,0,0,1,0,1,1,0', DBPSK sequences are scrambled using the scrambler sequence generated under the state, can be made
Obtain the OFDM symbol Peak-Average-Power Ratio generated by 16 kinds of leading signaling symbols sequences（Peak to Average Power
Ratio,PAPR）Maximum it is minimum.
In scrambling processes, with the arrival of each clock, each in scrambler sequence modulates sequence with leading symbol DBPSK
Each in row carries out XOR operation, then exports exclusive or as a result, defeated after obtaining the scrambling of leading symbol DBPSK modulation sequences
Go out.When carrying out XOR operation, if scrambled bits are 0, the output of DBPSK modulation values initial value；If scrambled bits are 1, DBPSK tune
Value processed negates output.
Wherein, PRBS Sequence maker includes the shift register group that length is 15, the initial shape of the shift register group
State is ' 0,0,0,1,0,1,1,1,0,0,1,0,1,1,0'.It is most left as the arrival of each clock carries out displacement from left to right
1 of side is filled by the result of the 1st of shift register group and the 15th phase exclusive or.Every 768 clock cycle carry out
It once resets, that is, is reset to original state.
Step S4：Sequence MSS_SCR is placed on 768 effective subcarriers after leading symbol is scrambled, and generates main part
Divide A.
The location index of the 768 effective subcarriers used in leading symbol is expressed as ki, 0≤i≤767, position point
Cloth selects 768 subcarrier load-modulate sequences such as on 1538 effective subcarriers, and the principle of selection is to be conducive to receiving terminal
Integral multiple subcarrier offset estimation is carried out using energy measuring.
Receiving terminal carries out subcarrier displacement, and the signal on subcarrier is then taken out according to sub-carrier positions pattern, and is calculated
Energy.In the case of alignment, i.e., no integral multiple subcarrier frequency deviation when, 768 sons being calculated according to layout
Energy on carrier wave reaches maximum；In the case of a misalignment, the energy is comparatively small.The design mesh of 2 subcarrier pattern of table
Mark is to make no sub-carrier offset and have the calculating energy great disparity of sub-carrier offset sufficiently large.
Table 2
It is shown.768 subcarrier load-modulate sequences are selected on 1538 effective subcarriers, the principle of selection is favourable
In receiving terminal integral multiple subcarrier offset estimation is carried out using energy measuring.
Receiving terminal carries out subcarrier displacement, and the signal on subcarrier is then taken out according to sub-carrier positions pattern, and is calculated
Energy.In the case of alignment, i.e., no integral multiple subcarrier frequency deviation when, 768 sons being calculated according to layout
Energy on carrier wave reaches maximum；In the case of a misalignment, the energy is comparatively small.The design mesh of 2 subcarrier pattern of table
Mark is to make no sub-carrier offset and have the calculating energy great disparity of sub-carrier offset sufficiently large.
The effective sub-carrier positions index of 768 of 2 leading symbol of table
In NGB-W systems, effective number of subcarriers N in 2K FFT modesaFor 1538, leading symbol has used wherein
768 subcarriers, therefore the power adjusting factor on each effectively subcarrier is 1538/768, i.e. 3.02dB.
The N of main part AaThe frequency domain mapping process of a effective subcarrier is such as
Shown in Fig. 1.Wherein, top numerical value represents the numerical value of effective sub-carrier indices k in Fig. 3, and lower section numerical value represents physics
The numerical value of sub-carrier indices k '；ym,l,kRepresent the corresponding modulation value of effective subcarrier, am,l,k′Represent physical sub-carrier it is corresponding plus
Load value, NaFor effective number of subcarriers.Each effectively subcarrier corresponds to a modulation value ym,l,k,0≤k≤Na- 1, this NaA modulation
Value ym,l,kIt needs to be mapped to NFFTWherein N in a physical sub-carrieraIt is a up.Specifically mapping mode is：FromA physical sub-carrier starts to place the 0th modulation value ym,l,0, put down successively, until right hand edge NFFT- 1 object
It manages subcarrier and places theA modulation valueThen, go to the 1st, left side physical sub-carrier and start placementIt is a
Modulation valueIt is discharged until by 768 modulation values.
The time domain waveform of leading symbol main part A can be expressed as：
Wherein, MSS_SCRiIt is i-th of value of sequence after leading symbol scrambles；kiRepresent the location index of effective subcarrier,
I-th listed of index value i.e. in table 2；NaIt is the quantity of effective subcarrier；TsIt is the sampling period of NGB-W systems.
Step S5：To the B' and C' of leading symbol main part A, frequency shift (FS) is done respectively, generates suffix B and prefix C.Before
The time domain waveform for leading symbol entirety is expressed as：
It is further illustrated below with specific embodiment and realizes synchronous process using the leading symbol of the present invention.
Step 1：The receiver docking collection of letters number carries out displacement correlation computations.Shifting correlation computations includes upper and lower two：It is related
Correlation computations, the correlation computations of correlator L of device U.Receive the time relationship between the frequency-shifted version of signal and its reception signal
Shown in following 4, wherein r ' (k) is r (k) frequency displacements-fSHObtained signal.
Step 2：Correlator U is multiplied with the output result of correlator L, obtains final output as a result, by the result
Whether peak value is higher than preset threshold value, it can be determined that NGB-W system signals whether there is.If it does, receiving terminal is sharp
With the time-domain position of peak value, time domain timing estimation can be carried out to system, and it is small to system progress using the phase of peak position
Several times frequency subcarrier is estimated partially.
Step 3：Decimal gall nut Nonlinear Transformation in Frequency Offset Estimation is obtained according to step 2, the docking collection of letters number carries out a frequency deviation correction.
Step 4：Starting for OFDM symbol is determined according to step 2, FFT transform is carried out to the signal after being corrected in step 3, is turned
Frequency domain is changed to, obtains sequence A'.
Step 5：In frequency domain, to sequence A' successively frequency displacement, such as from -10 to 10 shift, and often shift once, according to the present invention
Table selects 768 subcarrier load-modulate sequences on 1538 effective subcarriers, and the principle of selection is to be conducive to receiving terminal profit
Integral multiple subcarrier offset estimation is carried out with energy measuring.
Receiving terminal carries out subcarrier displacement, and the signal on subcarrier is then taken out according to sub-carrier positions pattern, and is calculated
Energy.In the case of alignment, i.e., no integral multiple subcarrier frequency deviation when, 768 sons being calculated according to layout
Energy on carrier wave reaches maximum；In the case of a misalignment, the energy is comparatively small.The design mesh of 2 subcarrier pattern of table
Mark is to make no sub-carrier offset and have the calculating energy great disparity of sub-carrier offset sufficiently large.
The sub-carrier positions index that table 2 is formulated takes out corresponding bearing value, the vector that this 768 bearing values are formed,
The vectorial ENERGY E is calculated, the frequency displacement number for taking out E maximums is integral multiple subcarrier frequency deviation size.
Step 6：Differential ference spiral is carried out to the vector of taking-up, obtains bit sequence, bit sequence is divided into three sections, it is each
16 sequences in Duan Yubiao 1 carry out correlation computations respectively, take out the sequence of correlated results maximum, the corresponding table 1 of the sequence the
The value of one row is exactly the S parameter detected, and such S1, S2 and S3 parameter detecting finishes.
In conclusion in the next-generation radio and television wireless communication system of the present invention in the generation method of leading symbol, it is preceding
The spatial structure for leading symbol uses 4096 points of shift-C-A-B structures, which utilizes former and later two frequency displacement repeating parts, real
Existing receiving terminal quickly finds signal in time domain, and realizes OFDM symbol Timing Synchronization and fractional part of frequency offset estimation；Wherein, use
4096 points of signaling informations that on the one hand can carry 12 bits；On the other hand, with respect to 2048 points, sample points are on the high side, in synchronization
Be conducive to the inhibition to noise in algorithm, improve net synchronization capability.So the present invention effectively overcome it is of the prior art it is a variety of lack
It puts and has high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as
Into all equivalent modifications or change, should by the present invention claim be covered.
Claims (3)
1. the generation method of leading symbol in a kind of next generation's radio and television wireless communication system, which is characterized in that include at least
Following steps：
Orthogonal modulation is carried out to leading signaling information, wherein, leading signaling information include be the S1 domains of 4 bits, S2 domains and
S3 domains；The S1 domains, S2 domains and S3 domains are each mapped to the complementary orthogonal sequence that a length is 256, are expressed as CSSS1、
CSSS2、CSSS3, obtain leading signaling symbols orthogonal modulation sequences MSS_SEQ=[CSSS1,CSSS2,CSSS3]；
DBPSK modulation is done to leading signaling symbols orthogonal modulation sequences MSS_SEQ, obtains leading symbol DBPSK modulation sequences
MSS_DIFF：
<mrow>
<mi>M</mi>
<mi>S</mi>
<mi>S</mi>
<mo>_</mo>
<msub>
<mi>DIFF</mi>
<mi>i</mi>
</msub>
<mo>=</mo>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<mi>M</mi>
<mi>S</mi>
<mi>S</mi>
<mo>_</mo>
<msub>
<mi>DIFF</mi>
<mrow>
<mi>i</mi>
<mo>-</mo>
<mn>1</mn>
</mrow>
</msub>
<mo>,</mo>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>M</mi>
<mi>S</mi>
<mi>S</mi>
<mo>_</mo>
<msub>
<mi>SEQ</mi>
<mi>i</mi>
</msub>
<mo>=</mo>
<mn>1</mn>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mo>-</mo>
<mi>M</mi>
<mi>S</mi>
<mi>S</mi>
<mo>_</mo>
<msub>
<mi>DIFF</mi>
<mrow>
<mi>i</mi>
<mo>-</mo>
<mn>1</mn>
</mrow>
</msub>
<mo>,</mo>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>M</mi>
<mi>S</mi>
<mi>S</mi>
<mo>_</mo>
<msub>
<mi>SEQ</mi>
<mi>i</mi>
</msub>
<mo>=</mo>
<mn>1</mn>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
</mrow>
Wherein, 0≤i≤767, and MSS_DIFF-1=1；
Leading symbol DBPSK modulation sequences MSS_DIFF is scrambled, obtains sequence MSS_SCR after leading symbol scrambling：
<mrow>
<mi>M</mi>
<mi>S</mi>
<mi>S</mi>
<mo>_</mo>
<msub>
<mi>SCR</mi>
<mi>i</mi>
</msub>
<mo>=</mo>
<mi>M</mi>
<mi>S</mi>
<mi>S</mi>
<mo>_</mo>
<msub>
<mi>DIFF</mi>
<mi>i</mi>
</msub>
<mo>*</mo>
<mn>2</mn>
<mrow>
<mo>(</mo>
<mfrac>
<mn>1</mn>
<mn>2</mn>
</mfrac>
<mo>-</mo>
<msub>
<mi>b</mi>
<mrow>
<mi>i</mi>
<mo>,</mo>
<mi>B</mi>
<mi>S</mi>
</mrow>
</msub>
<mo>)</mo>
</mrow>
</mrow>
Wherein, 0≤i≤767；bi,BSFor the preceding ith bit of pseudo-random binary sequence maker；
Sequence MSS_SCR is placed on 768 effective subcarriers after leading symbol is scrambled, generation main part A；
It is two parts of C' and B' that main part A, which is divided to, does frequency shift (FS) respectively to B' and C', generates suffix B and prefix C, finally
Leading symbol is generated by prefix C, main part A and suffix B；
The time domain waveform of the main part A of the leading symbol is expressed as：
<mrow>
<mi>P</mi>
<mo>_</mo>
<msub>
<mi>Sym</mi>
<mi>A</mi>
</msub>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<msqrt>
<mn>768</mn>
</msqrt>
</mfrac>
<mo>{</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>0</mn>
</mrow>
<mn>388</mn>
</munderover>
<mi>M</mi>
<mi>S</mi>
<mi>S</mi>
<mo>_</mo>
<msub>
<mi>SCR</mi>
<mi>i</mi>
</msub>
<mo>&times;</mo>
<msup>
<mi>e</mi>
<mrow>
<mi>j</mi>
<mn>2</mn>
<mi>&pi;</mi>
<mfrac>
<mrow>
<msub>
<mi>k</mi>
<mi>i</mi>
</msub>
<mo>-</mo>
<msub>
<mi>N</mi>
<mi>a</mi>
</msub>
<mo>/</mo>
<mn>2</mn>
</mrow>
<mrow>
<mn>2048</mn>
<msub>
<mi>T</mi>
<mi>s</mi>
</msub>
</mrow>
</mfrac>
<mi>t</mi>
</mrow>
</msup>
<mo>+</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>389</mn>
</mrow>
<mn>767</mn>
</munderover>
<mi>M</mi>
<mi>S</mi>
<mi>S</mi>
<mo>_</mo>
<msub>
<mi>SCR</mi>
<mi>i</mi>
</msub>
<mo>&times;</mo>
<msup>
<mi>e</mi>
<mrow>
<mi>j</mi>
<mn>2</mn>
<mi>&pi;</mi>
<mfrac>
<mrow>
<msub>
<mi>k</mi>
<mi>i</mi>
</msub>
<mo>-</mo>
<msub>
<mi>N</mi>
<mi>a</mi>
</msub>
<mo>/</mo>
<mn>2</mn>
<mo>+</mo>
<mn>1</mn>
</mrow>
<mrow>
<mn>2048</mn>
<msub>
<mi>T</mi>
<mi>s</mi>
</msub>
</mrow>
</mfrac>
<mi>t</mi>
</mrow>
</msup>
<mo>}</mo>
</mrow>
Wherein, MSS_SCRiIt is i-th of value of sequence after leading symbol scrambles；kiRepresent the location index of effective subcarrier；NaIt is
The quantity of effective subcarrier；TsIt is the sampling period of NGB-W systems；
The time domain waveform of the leading symbol entirety is expressed as：
When being scrambled to leading symbol DBPSK modulation sequences MSS_DIFF, before scrambler sequence is using the generation of PRBS Sequence maker
768 bits；
The PRBS Sequence maker includes the shift register group that length is 15, the original state of the shift register group
For ' 0,0,0,1,0,1,1,1,0,0,1,0,1,1,0'；When generating scrambler sequence, as the arrival of each clock displacement is posted
Storage group carries out displacement from left to right, leftmost 1 result by the 1st of shift register group and the 15th phase exclusive or
It is filled.
2. the generation method of leading symbol, special in next generation's radio and television wireless communication system according to claim 1
Sign is：In sequence after 768 subcarrier loading leading symbol scramblings are selected on 1538 effective subcarriers, subcarrier is selected
Principle be：Be conducive to receiving terminal using energy measuring to carry out integral multiple subcarrier offset estimation.
3. the generation method of leading symbol, special in next generation's radio and television wireless communication system according to claim 1
Sign is：When generating suffix B and prefix C, B' and C' carry out frequency shift (FS) f respectivelySH, wherein fSH=Δ f, Δ f is between subcarrier
Every.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310447188.XA CN104468445B (en) | 2013-09-25 | 2013-09-25 | The generation method of leading symbol in next-generation radio and television wireless communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310447188.XA CN104468445B (en) | 2013-09-25 | 2013-09-25 | The generation method of leading symbol in next-generation radio and television wireless communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104468445A CN104468445A (en) | 2015-03-25 |
| CN104468445B true CN104468445B (en) | 2018-06-05 |
Family
ID=52913833
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310447188.XA Active CN104468445B (en) | 2013-09-25 | 2013-09-25 | The generation method of leading symbol in next-generation radio and television wireless communication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104468445B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106936757B (en) * | 2015-06-05 | 2020-02-14 | 上海数字电视国家工程研究中心有限公司 | Method for selecting length of pilot symbol signal |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664839A (en) * | 2012-04-13 | 2012-09-12 | 豪威科技(上海)有限公司 | Channel estimating method and device |
| EP2541927A2 (en) * | 2010-02-23 | 2013-01-02 | LG Electronics Inc. | Broadcasting signal transmission device, broadcasting signal reception device, and method for transmitting/receiving broadcasting signal using same |
-
2013
- 2013-09-25 CN CN201310447188.XA patent/CN104468445B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2541927A2 (en) * | 2010-02-23 | 2013-01-02 | LG Electronics Inc. | Broadcasting signal transmission device, broadcasting signal reception device, and method for transmitting/receiving broadcasting signal using same |
| CN102664839A (en) * | 2012-04-13 | 2012-09-12 | 豪威科技(上海)有限公司 | Channel estimating method and device |
Non-Patent Citations (1)
| Title |
|---|
| A Novel Preamble Design for OFDM Transmission Parameter Signalling;Lifeng He et al;《Communications(ICC),2011 IEEE International Conference on》;20110609;正文第1-2页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104468445A (en) | 2015-03-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU734249B2 (en) | Receiving apparatus and receiving method | |
| CN102812679B (en) | For method and the device of accurate time synchronization in wireless telecommunication system | |
| JP5291714B2 (en) | Time frequency synchronization and frame number detection for DMB-T systems | |
| CN100589468C (en) | Method and apparatus for modulating-demodulating OFDM multi-carrier-wave signal time frequency | |
| CN103152312B (en) | A kind of optical OFDM system clock synchronization system of power adjustable and method | |
| KR20180112788A (en) | Signaling and Detection of Transmitter Identifiers in Broadcast Transmission Networks | |
| US9621396B2 (en) | Transmitter, receiver, and controlling methods thereof | |
| CN106330806B (en) | Fine frequency offset estimation method based on cyclic prefix and long training sequence field | |
| JP6108965B2 (en) | Device and method for synchronizing receiver and computer program | |
| CN108347399B (en) | Method and device for generating and receiving preamble signal | |
| CN101119350A (en) | OFDM system, fast synchronous method and sending terminal equipment | |
| CN104244398B (en) | Generation method based on the OFDM micro power radio communication system synchronization signals modulated | |
| CN101262460B (en) | A device and method for reducing peak mean ratio | |
| CN104468445B (en) | The generation method of leading symbol in next-generation radio and television wireless communication system | |
| CN100579239C (en) | Synchronization method and unit for receiver in DTMB system | |
| CN102687440A (en) | OFDM receiver,OFDM reception circuit,OFDM reception method,and OFDM reception program | |
| CN103078819B (en) | Fine symbol timing synchronization method and device thereof | |
| CN101408871B (en) | High-efficiency implementing method and equipment of digital crosscorrelator | |
| CN106416167A (en) | Timing offset estimation through SINR measurements in OFDM-based system | |
| CN101087285A (en) | A synchronization method for new generation of wireless mobile communication system | |
| CN102984114A (en) | Signal timing and frequency offset compensation control method applied to orthogonal frequency division multiplexing system | |
| CN103152310A (en) | Time domain self-correlation matching system and method for reducing PAPR (peak-to-average power ratio) of OFDM (orthogonal frequency division multiplexing) system | |
| CN101083508B (en) | OFDM modulation system performance test method based on low peak-valley ratio sequence transmission | |
| CN107426128A (en) | OFDM receiver carrier phase offset method of estimation based on training sequence | |
| CN103546416A (en) | Ofdm symbol synchronization method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |