CN110708266A - Wireless network synchronization method and device - Google Patents
Wireless network synchronization method and device Download PDFInfo
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- CN110708266A CN110708266A CN201810742689.3A CN201810742689A CN110708266A CN 110708266 A CN110708266 A CN 110708266A CN 201810742689 A CN201810742689 A CN 201810742689A CN 110708266 A CN110708266 A CN 110708266A
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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
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
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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
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
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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
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2657—Carrier synchronisation
Abstract
The invention provides a wireless network synchronization method and a wireless network synchronization device. The method comprises the following steps: the base station in the wireless network finds the arrival of the synchronization period of the service sub-band and constructs the synchronization sequence rss(m)：
c(n)＝(x1(n+NC)+x2(n+NC))mod2，NCIs a preset synchronization sequence length auxiliary factor; x is the number of1(n+31)＝(x1(n+3)+x1(n))mod2，x1(0)＝1，x1(n)＝0,n＝1,2,3,...,30；x2(n+31)＝(x2(n+3)+x2(n+2)+x2(n+1)+x2(n))mod2，x2(n), n ═ 0,1,2, 3.., 30 by
Is obtained byinitInitializing a factor for a synchronization sequence defined in a wireless network standard protocol; the base station uniformly divides the synchronization sequence into P segments,and each segment of subcarriers with the length of M/P is mapped to P OFDM symbols respectively to obtain a local frequency domain signal of the synchronous signal, and the local frequency domain signal is converted into a time domain signal and then is sent out. The invention simplifies the complexity of the synchronous sequence construction.
Description
Technical Field
The present invention relates to the field of synchronization technologies, and in particular, to a wireless network synchronization method and apparatus.
Background
In a wireless network, a base station and a terminal need to synchronize with each other at a timing.
For the wireless private network 230 system, the base station transmits a synchronization frame every 40 wireless frames on the traffic sub-band, and the synchronization signal transmission in the synchronization frame includes synchronization signal 1 transmission and synchronization signal 2 transmission. Both synchronization signal 1 and synchronization signal 2 are generated using a PN (pseudo random) code of length 70. In a frequency domain, a synchronous signal occupies a common sub-band with a bandwidth of 22 kHz; in the time domain, sync signal 2 is arranged in the front and occupies 462 sampling points, and sync signal 1 is placed behind sync signal 2 and occupies 463 sampling points.
With the continuous development of new wireless communication technologies and the vigorous development of mobile internet and internet of things industries, the demands of various industries on low-speed, low-cost, wide-coverage and large-capacity services are rapidly expanded. The channel demodulation performance of the current short sequence synchronization signal generation mode is not enough to support the requirement of wide coverage.
Disclosure of Invention
The invention provides a wireless network synchronization method and a wireless network synchronization device, which are used for simplifying the construction complexity of a synchronization sequence and improving the demodulation performance of the synchronization sequence so as to meet the requirement of supporting wide coverage.
The technical scheme of the invention is realized as follows:
a wireless network synchronization method, the method comprising:
a base station in a wireless network discovers that a synchronization period of a service sub-band arrives, and constructs a synchronization sequence r in the following wayss(m)：
Wherein M-0, 1,2,3, and M-, 1M is the length of the synchronization sequence;
c(n)＝(x1(n+NC)+x2(n+NC) Mod2, where:
NCis a preset synchronization sequence length auxiliary factor;
x1(n+31)＝(x1(n+3)+x1(n)) mod2 where x1(0)＝1，x1(n)＝0,n＝1,2,3,...,30；
x2(n+31)＝(x2(n+3)+x2(n+2)+x2(n+1)+x2(n)) mod2 where x2(n), n ═ 0,1,2, 3.., 30 byIs obtained byinitInitializing a factor for a synchronization sequence defined in a wireless network standard protocol;
the base station uniformly divides the synchronous sequence into preset P sections, each section is M/P sub-carriers in length, the sub-carriers are respectively mapped to P orthogonal frequency division multiplexing OFDM symbols to obtain local frequency domain signals of the synchronous signals, and the local frequency domain signals are converted into time domain signals and then are sent out.
The synchronization sequence is a pseudo-random PN code.
The wireless network is a wireless private network 230 system.
When the wireless network is a wireless private network 230 system, M is 154, P is 14, and the M/P is 11 consecutive subcarriers.
When the wireless network is a wireless private network 230 system, NC＝1600，
Wherein PRBIndex represents the absolute sub-band index number of the service sub-band,
represents a groupThe cell identity of the station.
A wireless network synchronization apparatus, the apparatus located at a base station of a wireless network, the apparatus comprising:
a synchronization sequence constructing module, configured to construct a synchronization sequence r in the following manner when a synchronization period of a service sub-band arrivesss(m)：
Wherein M-0, 1,2,3, and M-, 1M is the length of the synchronization sequence;
c(n)＝(x1(n+NC)+x2(n+NC) Mod2, where:
NCis a preset synchronization sequence length auxiliary factor;
x1(n+31)＝(x1(n+3)+x1(n)) mod2 where x1(0)＝1，x1(n)＝0,n＝1,2,3,...,30；
x2(n+31)＝(x2(n+3)+x2(n+2)+x2(n+1)+x2(n)) mod2 where x2(n), n ═ 0,1,2, 3.., 30 by
Is obtained byinitInitializing a factor for a synchronization sequence defined in a wireless network standard protocol;
and the synchronous sequence sending module is used for uniformly dividing the synchronous sequence constructed by the synchronous sequence construction module into preset P sections, wherein the length of each section is M/P subcarriers, the M/P subcarriers are respectively mapped to the P orthogonal frequency division multiplexing OFDM symbols to obtain a local frequency domain signal of the synchronous signal, and the local frequency domain signal is converted into a time domain signal and then sent out.
The synchronous sequence constructed by the synchronous sequence construction module is a pseudo-random PN code
The traffic sub-bands are located in the wireless private network 230 system.
When the traffic sub-band is located in the wireless private network 230 system,
the length M of the synchronization sequence constructed by the synchronization sequence construction module is 154, the synchronization sequence transmission module uniformly divides the synchronization sequence into P14 segments, and the M/P11 subcarriers are consecutive 11 subcarriers.
When the service sub-band is located in the wireless private network 230 system, the synchronization sequence constructing module constructs a synchronization sequence, NC＝1600，
Wherein PRBIndex represents the absolute sub-band index number of the service sub-band,
representing the cell identity of the base station.
The invention can realize wireless network synchronization by only constructing one synchronization sequence, simplifies the construction complexity of the synchronization sequence, improves the channel demodulation performance of the synchronization sequence and meets the requirement of supporting wide coverage.
Drawings
Fig. 1 is a flowchart of a wireless network synchronization method according to an embodiment of the present application;
fig. 2 is a flowchart of a wireless network synchronization method according to another embodiment of the present application;
fig. 3 is a schematic structural diagram of a wireless network synchronization apparatus according to an embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a flowchart of a wireless network synchronization method according to an embodiment of the present application, which includes the following steps:
step 101: the base station in the wireless network finds the arrival of the synchronization period of the service sub-band, and constructs the synchronization sequence r in the following wayss(m)：
Wherein M-0, 1,2,3, and M-, 1M is the length of the synchronization sequence;
c(n)＝(x1(n+NC)+x2(n+NC) Mod2, where:
NCis a preset synchronization sequence length auxiliary factor;
x1(n+31)＝(x1(n+3)+x1(n)) mod2 where x1(0)＝1，x1(n)＝0,n＝1,2,3,...,30；
x2(n+31)＝(x2(n+3)+x2(n+2)+x2(n+1)+x2(n)) mod2 where x2(n), n ═ 0,1,2, 3.., 30 by
Is obtained byinitThe factors are initialized for a synchronization sequence defined in a wireless network standard protocol.
Step 102: the base station uniformly divides the synchronization sequence into preset P sections, each section is M/P sub-carriers, and the M/P sub-carriers are respectively mapped onto P OFDM (Orthogonal Frequency Division Multiplexing) symbols to obtain a local Frequency domain signal of the synchronization signal, and the local Frequency domain signal is converted into a time domain signal and then sent out.
Fig. 2 is a flowchart of a wireless network synchronization method according to another embodiment of the present application, which includes the following specific steps:
step 201: the base station in the wireless network finds the arrival of the synchronization period of the service sub-band, and constructs the synchronization sequence r in the following wayss(m)：
Where M-0, 1,2,3, and M-, 1M is the length of the synchronization sequence, for example, for the wireless private network 230 system, preferably, M-154, the synchronization sequence is usually a PN code;
c(n)＝(x1(n+NC)+x2(n+NC) Mod2, where:
NCfor synchronizing sequencesThe value of the length auxiliary factor can be determined empirically, for example, for the wireless private network 230 system, preferably NC＝1600；
x1(n+31)＝(x1(n+3)+x1(n)) mod2 where x1(0)＝1，x1(n)＝0,n＝1,2,3,...,30；
x2(n+31)＝(x2(n+3)+x2(n+2)+x2(n+1)+x2(n)) mod2 where x2(n), n ═ 0,1,2, 3.., 30 can be determined by
Is obtained byinitInitializing a factor for the synchronization sequence, the value of which is related to the type of radio network, different radio networks cinitThe specific values are specified in a wireless network standard protocol, for example, for the wireless private network 230 system,PRBIndex represents the absolute sub-band index number of the traffic sub-band,and the service sub-band is used for transmitting service data and represents the cell identification of the base station.
It should be noted that, in Matlab application software, a special function can pass through
Calculate x2The expression of the function (n), n ═ 0,1,2, 3., 3, 0 is as follows:
x2(n)＝de2bi(Cinit,31,'right-msb')，n＝0,1,2,3,…,30。de2bi(C init31, 'right-msb') is a general formulainitConverting into a binary number with a length of 31 bits, wherein 31 bits from right to left of the binary number respectively represent x2(0)～x2(30) I.e. the rightmost bit of the binary number represents x2(0) The second bit on the right represents x2(1) The third bit generation on the rightTable x2(2) And so on, right-msb represents CinitTo the right.
It can be seen that the synchronization sequence rss(m) is a complex sequence.
Step 202: the base station uniformly divides the synchronous sequence into P sections, each section is M/P sub-carriers in length, the sub-carriers are respectively mapped to P OFDM symbols to obtain local frequency domain signals of the synchronous signals, and the local frequency domain signals are converted into time domain signals and then are sent out.
P is predetermined, and for the wireless private network 230 system, P is preferably 14.
For the wireless private network 230 system, preferably, the M/P subcarriers are consecutive subcarriers, such as: when M is 154, P is 14, and M/P is 11, the 28 th to 38 th subcarriers among the 64 subcarriers may be selected.
Fig. 3 is a schematic structural diagram of a wireless network synchronization apparatus according to an embodiment of the present application, where the apparatus mainly includes: a synchronization sequence construction module 31 and a synchronization sequence transmission module 32, wherein:
a synchronization sequence constructing module 31, configured to construct a synchronization sequence r as follows when a synchronization period of a service sub-band arrivesss(m)：
Wherein M-0, 1,2,3, and M-, 1M is the length of the synchronization sequence;
c(n)＝(x1(n+NC)+x2(n+NC) Mod2, where:
NCis a preset synchronization sequence length auxiliary factor;
x1(n+31)＝(x1(n+3)+x1(n)) mod2 where x1(0)＝1，x1(n)＝0,n＝1,2,3,...,30；
x2(n+31)＝(x2(n+3)+x2(n+2)+x2(n+1)+x2(n)) mod2 where x2(n), n ═ 0,1,2, 3.., 30 byIs obtained byinitThe factors are initialized for a synchronization sequence defined in a wireless network standard protocol.
And a synchronization sequence sending module 32, configured to uniformly divide the synchronization sequence constructed by the synchronization sequence constructing module 31 into P preset segments, where each segment has a length of M/P subcarriers, and is mapped to P OFDM symbols, respectively, so as to obtain a local frequency domain signal of the synchronization signal, and the local frequency domain signal is converted into a time domain signal and then sent out.
Preferably, the synchronization sequence constructed by the synchronization sequence constructing module 31 is a PN code.
Preferably, the traffic sub-bands are located in the wireless private network 230 system.
Preferably, when the service sub-band is located in the wireless private network 230 system, the length M of the synchronization sequence constructed by the synchronization sequence constructing module 31 is 154, the synchronization sequence transmitting module 32 divides the synchronization sequence into P14 segments uniformly, and M/P11 subcarriers are consecutive 11 subcarriers.
Preferably, when the service sub-band is located in the wireless private network 230 system, the synchronization sequence constructing module 31 constructs a synchronization sequence, NC＝1600，Wherein PRBIndex represents the absolute sub-band index number of the service sub-band,
representing the cell identity of the base station.
Preferably, the apparatus is located on a base station of a wireless network.
The invention has the following beneficial technical effects:
the invention can realize the synchronization of the service sub-bands in the wireless network by only constructing one synchronization sequence, thereby not only simplifying the construction complexity of the synchronization sequence, but also improving the channel demodulation performance of the synchronization sequence and meeting the wide coverage requirement through experimental verification.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A wireless network synchronization method, comprising:
the base station in the wireless network finds the arrival of the synchronization period of the service sub-band, and constructs the synchronization sequence r in the following wayss(m)：
Wherein M-0, 1,2,3, and M-, 1M is the length of the synchronization sequence;
c(n)＝(x1(n+NC)+x2(n+NC) Mod2, where:
NCis a preset synchronization sequence length auxiliary factor;
x1(n+31)＝(x1(n+3)+x1(n)) mod2 where x1(0)＝1，x1(n)＝0,n＝1,2,3,...,30；
x2(n+31)＝(x2(n+3)+x2(n+2)+x2(n+1)+x2(n)) mod2 where x2(n), n ═ 0,1,2, 3.., 30 by
Is obtained byinitInitializing a factor for a synchronization sequence defined in a wireless network standard protocol;
the base station uniformly divides the synchronous sequence into P sections, each section is M/P sub-carriers in length, the sub-carriers are respectively mapped to P orthogonal frequency division multiplexing OFDM symbols to obtain local frequency domain signals of the synchronous signals, and the local frequency domain signals are converted into time domain signals and then are sent out.
2. The method of claim 1, wherein the synchronization sequence is a pseudorandom PN code.
3. The method according to claim 1 or 2, wherein the wireless network is a wireless private network 230 system.
4. The method according to claim 3, wherein when the wireless network is a wireless private network 230 system, M is 154, P is 14, and the M/P is 11 consecutive subcarriers.
5. The method of claim 3, wherein N is the system of the wireless private network 230C＝1600，
Wherein PRBIndex represents the absolute sub-band index number of the service sub-band,
representing the cell identity of the base station.
6. A wireless network synchronization apparatus, the apparatus located at a base station of a wireless network, the apparatus comprising:
a synchronization sequence constructing module, configured to construct a synchronization sequence r as follows when a synchronization period of a service sub-band arrivesss(m)：
Wherein M-0, 1,2,3, and M-, 1M is the length of the synchronization sequence;
c(n)＝(x1(n+NC)+x2(n+NC) Mod2, where:
NCis a preset synchronization sequence length auxiliary factor;
x1(n+31)＝(x1(n+3)+x1(n)) mod2, where x1(0)＝1，x1(n)＝0,n＝1,2,3,...,30；
x2(n+31)＝(x2(n+3)+x2(n+2)+x2(n+1)+x2(n)) mod2 where x2(n), n ═ 0,1,2, 3.., 30 byIs obtained byinitInitializing a factor for a synchronization sequence defined in a wireless network standard protocol;
and the synchronous sequence sending module is used for uniformly dividing the synchronous sequence constructed by the synchronous sequence construction module into preset P sections, wherein the length of each section is M/P subcarriers, the M/P subcarriers are respectively mapped to the P orthogonal frequency division multiplexing OFDM symbols to obtain a local frequency domain signal of the synchronous signal, and the local frequency domain signal is converted into a time domain signal and then sent out.
7. The apparatus of claim 6, wherein the synchronization sequence constructed by the synchronization sequence constructing module is a pseudo-random PN code.
8. The apparatus of claim 6 or 7, wherein the traffic sub-band is located in a wireless private network 230 system.
9. The apparatus of claim 8, wherein when the traffic sub-band is located in a wireless private network 230 system,
the length M of the synchronization sequence constructed by the synchronization sequence construction module is 154, the synchronization sequence transmission module uniformly divides the synchronization sequence into P14 segments, and the M/P11 subcarriers are consecutive 11 subcarriers.
10. The apparatus of claim 8, wherein the synchronization sequence constructing module constructs a synchronization sequence when the service sub-band is located in the wireless private network 230 system, NC＝1600，
Wherein PRBIndex represents the absolute sub-band index number of the service sub-band,
representing the cell identity of the base station.
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| CN101772148A (en) * | 2009-01-05 | 2010-07-07 | 中兴通讯股份有限公司 | Auxiliary synchronizing channel configuring method and device, and subcarrier mapping method and device |
| CN102098259A (en) * | 2010-08-05 | 2011-06-15 | 普天信息技术研究院有限公司 | Signal emission method in multi-subband orthogonal frequency division multiplexing (OFDM) system |
| US20120027136A1 (en) * | 2001-10-17 | 2012-02-02 | Nortel Networks Limited | System access and synchronization methods for mimo ofdm communications systems and physical layer packet and preamble design |
| CN103428143A (en) * | 2012-05-22 | 2013-12-04 | 普天信息技术研究院有限公司 | Method for sending synchronization signals |
| CN105307260A (en) * | 2014-07-24 | 2016-02-03 | 普天信息技术有限公司 | Method for sending synchronous signal sequence |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120027136A1 (en) * | 2001-10-17 | 2012-02-02 | Nortel Networks Limited | System access and synchronization methods for mimo ofdm communications systems and physical layer packet and preamble design |
| CN101772148A (en) * | 2009-01-05 | 2010-07-07 | 中兴通讯股份有限公司 | Auxiliary synchronizing channel configuring method and device, and subcarrier mapping method and device |
| CN102098259A (en) * | 2010-08-05 | 2011-06-15 | 普天信息技术研究院有限公司 | Signal emission method in multi-subband orthogonal frequency division multiplexing (OFDM) system |
| CN103428143A (en) * | 2012-05-22 | 2013-12-04 | 普天信息技术研究院有限公司 | Method for sending synchronization signals |
| CN105307260A (en) * | 2014-07-24 | 2016-02-03 | 普天信息技术有限公司 | Method for sending synchronous signal sequence |
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Application publication date: 20200117 |