CN103139127B - Utilize the method that synchronizing sequence judges 3GPP LTE/LTE Advanced system transmission mode - Google Patents
Utilize the method that synchronizing sequence judges 3GPP LTE/LTE Advanced system transmission mode Download PDFInfo
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- CN103139127B CN103139127B CN201110397551.2A CN201110397551A CN103139127B CN 103139127 B CN103139127 B CN 103139127B CN 201110397551 A CN201110397551 A CN 201110397551A CN 103139127 B CN103139127 B CN 103139127B
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- peak
- transmission mode
- sequence
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
-
- 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
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2666—Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length
Abstract
nullThe present invention provides a kind of method utilizing synchronizing sequence to judge 3GPP LTE/LTE Advanced system transmission mode，The content of the method is: utilize during in FDD transmission mode, main synchronizing sequence PSS and secondary synchronization sequences SSS is positioned at two continuous print OFDM symbol，And the characteristic of 2 OFDM symbol of PSS and SSS midfeather in TDD transmission mode，Carry out mirror image by the time-domain data sequence after receiver is received sampling to be correlated with and obtain the peak of main synchronizing sequence PSS，Described time-domain data sequence is carried out the relevant peak obtaining secondary synchronization sequences SSS of mirror image conjugation，Between peak and the peak of secondary synchronization sequences SSS according to main synchronizing sequence PSS, the OFDM symbol number at interval determines the transmission mode of 3GPP LTE/LTE Advanced system.The method of the invention is made without organizing the locally associated detection of SSS sequence more, effectively reduces operand；Meanwhile, based on judged result, it is also possible to reduce the sequence context that the slip of SSS sequence is relevant, thus reduce operand further.
Description
Technical field
The invention belongs to mobile communication technology field, relate to the determination methods of a kind of system transmission mode, be specifically related to one
Plant the method utilizing synchronizing sequence to judge 3GPP LTE/LTE Advanced system transmission mode.
Background technology
3GPP LTE/LTE Advanced system supports two kinds of frame structure format, FDD (Frequency Division
Duplexing, FDD) and TDD (Time Division Duplexing, time division duplex).Wherein, FDD transmission mode
In, main synchronizing sequence (PSS) and secondary synchronization sequences (SSS) are positioned in two continuous print OFDM symbol.In TDD transmission mode, PSS
With 2 OFDM symbol of SSS midfeather.
LTE/LTE Advanced terminal, when carrying out initial synchronisation, needs to obtain following information: Symbol Timing, frequency deviation is estimated
Meter, transmission mode (TDD/FDD), CP configuration mode (conventional CP/ extends CP) etc..The local PSS correlation technique of general utilization obtains
Symbol Timing, utilizes SSS getting frame to synchronize.After capture PSS and SSS, judge transmission mode according to the positional distance of PSS and SSS
With CP configuration mode.
If LTE/LTE Advanced needs to configure 3 groups of PSS sequences and 168 groups of SSS sequences, then said method needs
Carrying out many groups of (3,168) related operations, computation complexity is higher.Further, in the case of unknown transmission mode, SSS needs
Near PSS in a big way in carry out slip coherent detection, this also brings bigger operand.
Summary of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide one and utilizes synchronizing sequence to judge
The method of 3GPPLTE/LTE Advanced system transmission mode, the method is made without organizing the locally associated of SSS sequence more
Detection, effectively reduces operand.
For achieving the above object and other relevant purposes, the present invention provides one to utilize synchronizing sequence to judge 3GPP LTE/
The method of LTE Advanced system transmission mode.
A kind of method utilizing synchronizing sequence to judge 3GPP LTE/LTE Advanced system transmission mode, the method
Content is: utilize during in FDD transmission mode, main synchronizing sequence PSS and secondary synchronization sequences SSS is positioned at two continuous print OFDM symbol,
And the characteristic of 2 OFDM symbol of PSS and SSS midfeather in TDD transmission mode, by receiver being received the time domain after sampling
Data sequence carries out mirror image and is correlated with and obtains the peak of main synchronizing sequence PSS, described time-domain data sequence carries out mirror image altogether
Yoke is correlated with and is obtained the peak of secondary synchronization sequences SSS, according to peak and the secondary synchronization sequences SSS of main synchronizing sequence PSS
Peak between the OFDM symbol number at interval determine the transmission mode of 3GPP LTE/LTE Advanced system.
As a preferred embodiment of the present invention, if the peak of described main synchronizing sequence PSS is inconspicuous, then cumulative many
The mirror image correlated results of individual PSS transmission cycle carries out peak value again and determines.
As the another kind of preferred version of the present invention, described mirror image is related as that slip mirror image is relevant or difference mirror image is correlated with.
As another preferred version of the present invention, if the peak of described secondary synchronization sequences SSS is inconspicuous, then add up
The mirror image conjugation correlated results of multiple SSS transmission cycles carries out peak value again and determines.
As another preferred version of the present invention, described mirror image conjugation is related as slip mirror image conjugation and is correlated with or difference mirror
Image conjugate is correlated with.
As another preferred version of the present invention, described synchronizing sequence is utilized to judge 3GPP LTE/LTE Advanced
The method of system transmission mode specifically includes following steps:
Step one, receiver storage receives data；
Step 2, obtains the time-domain data sequence in synchronizing signal bandwidth to after receiving data filtering；
Step 3, carries out to described time-domain data sequence that slip mirror image is relevant or difference mirror image is correlated with, when signal to noise ratio is relatively low
The slip correlated results of cumulative multiple PSS transmission cycles, it is thus achieved that the peak-peak position of main synchronizing sequence PSS；
Step 4, from the peak-peak position of main synchronizing sequence PSS, front 3 OFDM symbol start to enter time-domain data sequence
Row mirror image conjugation is relevant or difference mirror image conjugation is relevant, the relevant knot of the slip of multiple SSS transmission cycle that adds up when signal to noise ratio is relatively low
Really, it is thus achieved that the peak of secondary synchronization sequences SSS；
Step 5, if the number at interval between the peak of main synchronizing sequence PSS and the peak of secondary synchronization sequences SSS
According to symbolic number more than 1 OFDM data length, then it is judged as TDD transmission mode, is otherwise judged as FDD transmission mode.
Synchronizing sequence is utilized to judge 3GPP LTE/LTE Advanced system transfers mould as it has been described above, of the present invention
The method of formula, has the advantages that
The present invention utilizes PSS to have specular characteristic in time domain, and it is symmetrical special that SSS sequence has mirror image conjugation in time domain
Property, the mirror image that proposes to utilize time domain receiving sequence is relevant/and result that conjugation is relevant is transmitted the judgement of pattern；The method is not required to
Carry out organizing the locally associated detection of SSS sequence more, effectively reduce operand；Meanwhile, based on judged result, it is also possible to reduce
The sequence context that the slip of SSS sequence is relevant, thus reduce operand further.
Accompanying drawing explanation
Fig. 1 is of the present invention to utilize synchronizing sequence to judge 3GPP LTE/LTE Advanced system transmission mode
Method flow diagram.
Fig. 2 be in 3GPP LTE/LTE Advanced system when conventional CP the frame structure format schematic diagram of FDD.
Fig. 3 be in 3GPP LTE/LTE Advanced system when conventional CP the frame structure format schematic diagram of TDD.
Detailed description of the invention
Below by way of specific instantiation, embodiments of the present invention being described, 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 be by the most different concrete realities
The mode of executing is carried out or applies, the every details in this specification can also based on different viewpoints and application, without departing from
Various modification or change is carried out under the spirit of the present invention.
Refer to accompanying drawing.It should be noted that the diagram provided in the present embodiment illustrates the present invention the most in a schematic way
Basic conception, the most graphic in component count time only display with relevant assembly in the present invention rather than is implemented according to reality, shape
Shape and size are drawn, and during its actual enforcement, the kenel of each assembly, quantity and ratio can be a kind of random change, and its assembly cloth
Office's kenel is likely to increasingly complex.
The present invention relates to moving communicating field, be specifically related to the TDD/FDD of a kind of 3GPP LTE/LTE Advanced system
The determination methods of transmission mode.3GPP LTE/LTE Advanced system supports two kinds of duplex modes, TDD and FDD.Receiver
Need to first determine whether the duplex mode of system before carrying out data demodulation.The present invention proposes one and utilizes synchronizing sequence to judge 3GPP
The method of LTE/LTEAdvanced system transmission mode, the method utilizes main synchronizing sequence (PSS) and secondary synchronization sequences (SSS)
Time domain specular characteristic, judge the duplex mode of system according to the time mark space length of two continuous peak values.The present invention
Described method is applicable to 3GPP LTE/LTE Advanced system.
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described in further detail.
Embodiment one
The present embodiment provides a kind of side utilizing synchronizing sequence to judge 3GPP LTE/LTE Advanced system transmission mode
Method, the method is the 3GPP LTE/LTE Advanced system transmission mode (TDD/ judged based on synchronizing sequence (PSS and SSS)
FDD) method, as it is shown in figure 1, concrete judge process is as follows:
S1, receiver storage receives data；
S2, obtains the time-domain data sequence in synchronizing signal bandwidth to receiving data filtering；
S3, carries out to time-domain data sequence that slip mirror image is relevant or difference mirror image is correlated with, and can add up many when signal to noise ratio is relatively low
The slip correlated results of individual PSS transmission cycle, observes peak-peak position；Wherein, mirror image is relevant a length of N/2, N are OFDM
FFT count；
S4, front 3 OFDM symbol in peak-peak position from S3 start time-domain data sequence is carried out mirror image conjugate phases
Close or difference mirror image conjugation is relevant, the slip correlated results of multiple SSS transmission cycle that can add up when signal to noise ratio is relatively low, observe bright
Aobvious peak；Wherein, the FFT that a length of N/2, N are OFDM that mirror image is relevant counts.
S5, it is judged that peak value and the data symbols count of peak intervals in S3 in S4；If the data symbols count at interval is more than 1
OFDM data length, then be judged as TDD transmission mode；Otherwise it is judged as FDD transmission mode.
The method utilizing synchronizing sequence to judge 3GPP LTE/LTE Advanced system transmission mode of the present invention can
Not rely on PSS and SSS that detection obtains, meanwhile, the search model judging can effectively to reduce SSS is carried out according to peak
Enclose.
Embodiment two
The present embodiment provides a kind of side utilizing synchronizing sequence to judge 3GPP LTE/LTE Advanced system transmission mode
Method, as shown in Figures 2 and 3, Fig. 2 gives FDD frame structure format of FDD when conventional CP, and Fig. 3 gives TDD when conventional CP
The frame structure format of TDD.As shown in Figures 2 and 3, in FDD transmission mode, SSS and PSS is adjacent；And in TDD transmission mode, PSS
With SSS is spaced 2 OFDM symbol.
As a example by Fig. 2 and Fig. 3, be given and of the present invention utilize synchronizing sequence to judge 3GPP LTE/LTE Advanced
The process that implements of the method for system transmission mode:
S1 ', receiver receives transmission data in time domain；
The transmission data received are filtered in synchronizing signal bandwidth, obtain in 1.08MHz bandwidth by S2 '
The time-domain data sequence of 1.92MHz sample rate；This is the counting as N=128 of OFDM corresponding with data sequence；Note 1.92MHz adopts
The time-domain data sequence of sample rate is y (n)；
S3 ', carries out slip mirror image to time-domain data sequence y (n) after sampling and is correlated with, it may be assumed that
Observe and record the position of the peak-peak of R (i)；When this peak is inconspicuous, difference can be used further
Mirror image is divided to be correlated with, and the correlated results in cumulative multiple PSS cycles；
S4 ', starts the time domain data sequence after sampling from front 3 OFDM symbol of the peak-peak position described in S3 '
It is relevant that row y (n) carry out mirror image conjugation, it may be assumed that
Observe and record the peak-peak position of R ' (i)；When this peak is inconspicuous, difference can be used further
Mirror image conjugation is relevant, and the correlated results in cumulative multiple SSS cycles；
S5 ', it is judged that the data symbols count of the peak value in S4 ' and the peak intervals in S3 ', if the data symbols count at interval is big
In 1 OFDM data length, then it is judged as TDD transmission mode；Otherwise it is judged as FDD transmission mode.
So, the present invention effectively overcomes various shortcoming of the prior art and has high industrial utilization.
The principle of above-described embodiment only illustrative present invention and effect thereof, not for limiting the present invention.Any ripe
Above-described embodiment all can be modified under the spirit and the scope of the present invention or change by the personage knowing this technology.Cause
This, have usually intellectual such as complete with institute under technological thought without departing from disclosed spirit in art
All equivalences become are modified or change, and must be contained by the claim of the present invention.
Claims (6)
1. one kind utilizes the method that synchronizing sequence judges 3GPP LTE/LTE Advanced system transmission mode, it is characterised in that
The content of the described method utilizing synchronizing sequence to judge 3GPP LTE/LTE Advanced system transmission mode is: utilize FDD to pass
During in defeated pattern, main synchronizing sequence PSS and secondary synchronization sequences SSS is positioned at two continuous print OFDM symbol, and in TDD transmission mode
The characteristic of 2 OFDM symbol of PSS and SSS midfeather, carries out mirror by the time-domain data sequence after receiver is received sampling
Picture is correlated with and is obtained the peak of main synchronizing sequence PSS, described time-domain data sequence carries out the relevant acquisition of mirror image conjugation auxiliary same
The peak of step sequence SSS, according between peak and the peak of secondary synchronization sequences SSS of main synchronizing sequence PSS
The OFDM symbol number at interval determines the transmission mode of 3GPP LTE/LTE Advanced system.
The most according to claim 1 synchronizing sequence is utilized to judge 3GPP LTE/LTE Advanced system transmission mode
Method, it is characterised in that: if the peak of described main synchronizing sequence PSS is inconspicuous, then the mirror of multiple PSS transmission cycle that adds up
Carry out peak value again to determine as correlated results.
The most according to claim 2 synchronizing sequence is utilized to judge 3GPP LTE/LTE Advanced system transmission mode
Method, it is characterised in that: described mirror image is related as that slip mirror image is relevant or difference mirror image is correlated with.
The most according to claim 1 synchronizing sequence is utilized to judge 3GPP LTE/LTE Advanced system transmission mode
Method, it is characterised in that: if the peak of described secondary synchronization sequences SSS is inconspicuous, then the mirror of multiple SSS transmission cycle that adds up
Image conjugate correlated results carries out peak value again and determines.
The most according to claim 4 synchronizing sequence is utilized to judge 3GPP LTE/LTE Advanced system transmission mode
Method, it is characterised in that: described mirror image conjugation is related as that slip mirror image conjugation is relevant or difference mirror image conjugation is relevant.
The most according to claim 1 synchronizing sequence is utilized to judge 3GPP LTE/LTE Advanced system transmission mode
Method, it is characterised in that described method specifically include following steps:
Step one, receiver storage receives data；
Step 2, obtains the time-domain data sequence in synchronizing signal bandwidth to after receiving data filtering；
Step 3, carries out to described time-domain data sequence that slip mirror image is relevant or difference mirror image is correlated with, cumulative when signal to noise ratio is relatively low
The slip correlated results of multiple PSS transmission cycles, it is thus achieved that the peak-peak position of main synchronizing sequence PSS；
Step 4, from the peak-peak position of main synchronizing sequence PSS, front 3 OFDM symbol start time-domain data sequence is carried out mirror
Image conjugate is relevant or difference mirror image conjugation is relevant, and the slip correlated results of multiple SSS transmission cycle that adds up when signal to noise ratio is relatively low obtains
Obtain the peak of secondary synchronization sequences SSS；
Step 5, if the data symbols at interval between the peak of main synchronizing sequence PSS and the peak of secondary synchronization sequences SSS
Count is more than 1 OFDM data length, then be judged as TDD transmission mode, be otherwise judged as FDD transmission mode.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110397551.2A CN103139127B (en) | 2011-12-02 | 2011-12-02 | Utilize the method that synchronizing sequence judges 3GPP LTE/LTE Advanced system transmission mode |
| PCT/CN2012/085709 WO2013079029A1 (en) | 2011-12-02 | 2012-12-01 | Method for determining transmission mode of 3gpp lte/lte advanced system by using synchronization sequences |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110397551.2A CN103139127B (en) | 2011-12-02 | 2011-12-02 | Utilize the method that synchronizing sequence judges 3GPP LTE/LTE Advanced system transmission mode |
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| Publication Number | Publication Date |
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| CN103139127A CN103139127A (en) | 2013-06-05 |
| CN103139127B true CN103139127B (en) | 2016-12-21 |
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| CN201110397551.2A Expired - Fee Related CN103139127B (en) | 2011-12-02 | 2011-12-02 | Utilize the method that synchronizing sequence judges 3GPP LTE/LTE Advanced system transmission mode |
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| CN (1) | CN103139127B (en) |
| WO (1) | WO2013079029A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104581922B (en) * | 2013-10-23 | 2019-06-18 | 中兴通讯股份有限公司 | The method and apparatus that primary synchronization signal is realized in time domain in a kind of LTE system |
| CN109302725B (en) * | 2017-12-28 | 2023-05-09 | 上海创远仪器技术股份有限公司 | LTE-Advanced high-speed asynchronous and synchronous extraction method and device |
| CN111526578B (en) | 2019-02-03 | 2021-06-22 | 华为技术有限公司 | Method for transmitting synchronization signal and terminal equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6704374B1 (en) * | 2000-02-16 | 2004-03-09 | Thomson Licensing S.A. | Local oscillator frequency correction in an orthogonal frequency division multiplexing system |
| CN101425888A (en) * | 2007-11-02 | 2009-05-06 | 北京三星通信技术研究有限公司 | Device and method for synchronous signal transmission |
| CN101860502A (en) * | 2010-04-14 | 2010-10-13 | 中国科学院计算技术研究所 | Method and device for detecting duplex mode of LTE system |
| CN102014462A (en) * | 2009-11-10 | 2011-04-13 | 大唐移动通信设备有限公司 | Cell search method and equipment |
-
2011
- 2011-12-02 CN CN201110397551.2A patent/CN103139127B/en not_active Expired - Fee Related
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2012
- 2012-12-01 WO PCT/CN2012/085709 patent/WO2013079029A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6704374B1 (en) * | 2000-02-16 | 2004-03-09 | Thomson Licensing S.A. | Local oscillator frequency correction in an orthogonal frequency division multiplexing system |
| CN101425888A (en) * | 2007-11-02 | 2009-05-06 | 北京三星通信技术研究有限公司 | Device and method for synchronous signal transmission |
| CN102014462A (en) * | 2009-11-10 | 2011-04-13 | 大唐移动通信设备有限公司 | Cell search method and equipment |
| CN101860502A (en) * | 2010-04-14 | 2010-10-13 | 中国科学院计算技术研究所 | Method and device for detecting duplex mode of LTE system |
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| Publication number | Publication date |
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| WO2013079029A1 (en) | 2013-06-06 |
| CN103139127A (en) | 2013-06-05 |
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