CN106953823A - A kind of high-precision frame synchornization method of the radio communication based on synchronizing sequence - Google Patents
A kind of high-precision frame synchornization method of the radio communication based on synchronizing sequence Download PDFInfo
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- CN106953823A CN106953823A CN201710137590.6A CN201710137590A CN106953823A CN 106953823 A CN106953823 A CN 106953823A CN 201710137590 A CN201710137590 A CN 201710137590A CN 106953823 A CN106953823 A CN 106953823A
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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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Abstract
The invention discloses a kind of high-precision frame synchornization method of radio communication based on synchronizing sequence, LPF is carried out to baseband signal first, carry out thick synchronization and data storage respectively afterwards, thick synchronism output carries the sync bit of certain error, data storage is in order to which the follow-up essence that carries out synchronously does data preparation, smart synchronous main points be carried out it is non-it is down-sampled under cross-correlation, make use of all information of synchronizing sequence, it is thus possible to obtain most accurate sync bit.Frame synchronization precision of the present invention is high, it is adaptable to the wireless communication system with fixed frame format.
Description
Technical field
The present invention relates to a kind of high-precision frame synchornization method of radio communication based on synchronizing sequence, belong to radio communication skill
Art.
Background technology
In wireless communication technology, especially with OFDM (Orthogonal Frequency Division
Multiplexing, OFDM) technology is the modulation scheme with fixed frame structure of representative, transmitting terminal and receiving terminal must be in skies
The synchronization of radio frames in time is carried out on mouth, i.e. receiving terminal determines the start position of the radio frames transmitted by transmitting terminal, so that
Receiving terminal can distinguish the position of each difference transmission symbol of whole radio frames, be that follow-up demodulation is prepared.Frame synchronization is main
There are the two methods based on cyclic prefix and based on synchronizing sequence, in the frame synchornization method based on synchronizing sequence：Receiving
Base band data and the synchronizing sequence that is locally stored carry out cross-correlation, the peak value for finding cross-correlation output valve correspond to synchronous sequence
The corresponding position of row, according to position of the synchronizing sequence in whole radio frames, so as to release the starting point of radio frames.
In order to which the structure with radio frames matches, the length of synchronizing sequence is generally large；Simultaneously for transmission rate request
High system, sample rate is higher, then the base band data rate of system is big.In order to reduce the calculation times of cross correlation algorithm, drop
Low complex degree, can carry out more than current frame synchronization algorithm down-sampled to base band data, then carry out cross-correlation.Although so reducing
Complexity, but have lost the precision of frame synchronization, certain error is caused to system.
The content of the invention
Goal of the invention：In order to solve the synchronization that the frame synchronization (being classified as thick synchronization below) done after above-mentioned reduction sample rate is brought
The problem of position is inaccurate, while reducing synchronous complexity as far as possible, the present invention proposes a kind of based on the wireless of synchronizing sequence
The high-precision frame synchornization method of communication, compared to thick synchronization be simply added into complexity very low module can on thick synchronous foundation,
Obtain accurate frame synchronization position.
In order to overcome the deficiencies in the prior art, the present invention provides a kind of
Technical scheme：To achieve the above object, the technical solution adopted by the present invention is：
A kind of high-precision frame synchornization method of the radio communication based on synchronizing sequence, in a wireless communication system, to nothing
Synchronizing sequence in line frame is detected, accurately determines wireless frame start position, solves radio frames time domain in radio communication
On precise timing synchronization problem, while overcome general essence synchronous institute with resource consumption it is big the problem of；Specifically include as follows
Step：
(1) LPF is carried out to the base band data received, eliminates the interference of asynchronous sequence signal；Using based on following
Ring prefix or frame synchornization method based on synchronizing sequence carry out thick synchronous, obtain thick sync bit (i.e. thick synchronously to be navigated to
Start position of the synchronizing sequence in data frame is received), the original synchronizing sequence obtained according to thick sync bit is stored, this is original
The length of synchronizing sequence is L point；
(2) start the n-th point of original synchronizing sequence starting point forward, length is used as base band number for L+2N+1 data
According to storing the base band data；
(3) original synchronizing sequence and the base band data of L+2N+1 points to L points carries out cross-correlation calculation and (carries out 2N+1 mutual
Close), the cross-correlation calculation does not carry out down-sampled to original synchronizing sequence, therefore contains all information of original synchronizing sequence,
Improve the precision of precise synchronization position；
(4) peak value of cross correlation results is searched for, and finds the corresponding position of the peak value, that is, obtains corresponding sequence number；Mutually
The sequence number for closing result is counted from the starting point of base band data, corresponding 1~2N+1 of serial number；The corresponding position of the peak value found is turned
Change biasing into, i.e., subtract N in sequence number, so the scope of biasing is (- N, N)；
(5) thick sync bit is added with biasing, as a result as final smart sync bit.
It is preferred that, in the step (2), N is the absolute value of thick synchronous worst error, i.e., thick synchronous worst error is ± N；
Therefore, we are possible to when positioning base band data as long as expanding N number of point respectively before and after original synchronizing sequence and can include
Synchronizing sequence, so when doing L point cross-correlation calculations, peak value must can be found.
In the present invention, first, original position and length to base band data have done certain requirement so that the base band number of taking-up
According to the scope of original synchronizing sequence can be covered completely；Secondly, when carrying out cross-correlation calculation, complete original synchronous sequence is employed
Row so that cross-correlation calculation make use of whole sampling point informations of original synchronizing sequence, it is ensured that the synchronous accuracy of essence；Separately
Outside, we will bias the gap for being interpreted as smart sync bit and thick sync bit, and thick sync bit is added with biasing, you can
To smart sync bit.
It should be noted that transmitting terminal of the present invention in system, it is necessary to strict to send the wireless communication with fixed frame format
Number, and position of the synchronizing sequence in frame format can not change
Beneficial effect：The high-precision frame synchornization method of the radio communication based on synchronizing sequence that the present invention is provided, with as follows
A little, this smart synchronized algorithm is accurately obtained between thick sync bit and actual synchronization position on the basis of traditional thick synchronization
Deviation, so as to calculate smart synchronous point, 2N+1 L point cross-correlation is only with the addition of compared with thick synchronization, resource consumption is extremely low, together
Walk precision high；The present invention is reasonable in design, and substantially, algorithm complex is low for synchronous effect.
Brief description of the drawings
Fig. 1 is implementing procedure figure of the invention；
The scope schematic diagram for the base band data that Fig. 2 stores for the present invention.
Embodiment
The present invention is further described with reference to LTE SISO systems.
LTE SISO systems are divided into 10ms using strictly frame format, one radio frames of system, and each radio frames are divided into 10
Individual subframe, each subframe is divided into 2 time slots, each time slot comprising 7 OFDM symbols, and each symbol is adjusted using 2048 point IFFT
System, adds cyclic prefix, and a radio frames have 307200 points, and systematic sampling rate is 30.72MSamples/s, synchronizing sequence
It is added in first OFDM symbol of radio frames, length L is 2048, synchronizing sequence selection PSS sequences here, with a width of
0.465MHz, emitter in strict accordance with frame format and must continue to send the radio frames with PSS sequences, and receiver could carry out
Follow-up essence is synchronous.
In receiving terminal, by down coversion, base band data is obtained by ADC, synchronizing sequence is filtered using low pass filter first
Out-of-band interference signal, eliminates the influence to subsequent synchronisation algorithm, and two moulds are given simultaneously by the signal of low pass filter
Block：Thick synchronization module and base band data memory module, the selection of thick synchronization module are more, be based primarily upon at present it is down-sampled (can be with
Select down-sampled 16 times) cross-correlation is carried out after base band data obtain thick sync bit, the length of cross-correlator now is removed for L
It is here 128, the algorithm can produce certain error with down-sampled multiple；Base band data memory module is according to thick sync bit
Put, the base band data in storage synchronizing sequence location, but do not know that the starting point of synchronizing sequence is located at and store base band data
Which point.
After data storage, the auto-correlation of L points is carried out, 2N+1 cross-correlation is carried out here, in down-sampled 16 times of situation
Under, worst error is 8, so N=8, carries out 17 L point cross-correlation altogether.
The search of peak value is carried out after cross-correlation, the corresponding coordinate of peak value is found, 0~2N+1 is converted into biasing ,-N~N,
Thick sync bit is added with biasing again, you can obtain the synchronous position of final essence.
The above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (2)
1. a kind of high-precision frame synchornization method of the radio communication based on synchronizing sequence, it is characterised in that：For in radio communication system
In system, the synchronizing sequence in radio frames is detected, wireless frame start position is accurately determined, following step is specifically included
Suddenly：
(1) LPF is carried out to the base band data received, using the frame synchronization based on cyclic prefix or based on synchronizing sequence
Method carries out slightly synchronously, obtaining thick sync bit, storing the original synchronizing sequence obtained according to thick sync bit, the original synchronization
The length of sequence is L point；
(2) start the n-th point of original synchronizing sequence starting point forward, length for L+2N+1 data as base band data,
Store the base band data；
(3) cross-correlation calculation is carried out to original synchronizing sequence and base band data；
(4) peak value of cross correlation results is searched for, and finds the corresponding position of the peak value, that is, obtains corresponding sequence number；Cross-correlation knot
The sequence number of fruit is counted from the starting point of base band data, corresponding 1~2N+1 of serial number；The corresponding position of the peak value found is converted into
Biasing, i.e., subtract N in sequence number, so the scope of biasing is (- N, N)；
(5) thick sync bit is added with biasing, as a result as final smart sync bit.
2. the high-precision frame synchornization method of the radio communication based on synchronizing sequence according to claim 1, it is characterised in that：Institute
State in step (2), N is the absolute value of thick synchronous worst error, i.e., thick synchronous worst error is ± N.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109218247A (en) * | 2018-11-27 | 2019-01-15 | 威胜信息技术股份有限公司 | Time synchronization method based on novel synchronous sequence |
| CN112398566A (en) * | 2020-11-16 | 2021-02-23 | 中国电子科技集团公司第二十九研究所 | High-precision arrival time calculation method and device for burst communication system |
| CN112702296A (en) * | 2020-12-18 | 2021-04-23 | 上海微波技术研究所（中国电子科技集团公司第五十研究所） | FPGA (field programmable Gate array) realization method and system for data synchronization parallelization in millimeter wave communication |
| CN114765528A (en) * | 2021-01-15 | 2022-07-19 | 烽火通信科技股份有限公司 | Frame synchronization method, device, equipment and readable storage medium |
| CN115333571A (en) * | 2022-06-22 | 2022-11-11 | 飞芯智控(西安)科技有限公司 | Synchronous processing method and device of frequency hopping communication system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1773979A (en) * | 2004-11-09 | 2006-05-17 | 华为技术有限公司 | Orthogonal frequency division multiplexing accurate time synchronizing, frame synchronizing and synchronous tracking method |
| WO2006137023A3 (en) * | 2005-06-24 | 2007-03-08 | Koninkl Philips Electronics Nv | Method and apparatus for synchronization in wireless communication system |
| CN101778088A (en) * | 2010-03-12 | 2010-07-14 | 中国科学院声学研究所 | Training sequence frame timing synchronized method based on pseudo-random sequence modulation based |
| CN102143117A (en) * | 2011-03-31 | 2011-08-03 | 福州大学 | Time-frequency synchronization joint estimation method based on multi-carrier receiver of digital television media broadcast (DTMB) system |
-
2017
- 2017-03-09 CN CN201710137590.6A patent/CN106953823B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1773979A (en) * | 2004-11-09 | 2006-05-17 | 华为技术有限公司 | Orthogonal frequency division multiplexing accurate time synchronizing, frame synchronizing and synchronous tracking method |
| WO2006137023A3 (en) * | 2005-06-24 | 2007-03-08 | Koninkl Philips Electronics Nv | Method and apparatus for synchronization in wireless communication system |
| CN101778088A (en) * | 2010-03-12 | 2010-07-14 | 中国科学院声学研究所 | Training sequence frame timing synchronized method based on pseudo-random sequence modulation based |
| CN102143117A (en) * | 2011-03-31 | 2011-08-03 | 福州大学 | Time-frequency synchronization joint estimation method based on multi-carrier receiver of digital television media broadcast (DTMB) system |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109218247A (en) * | 2018-11-27 | 2019-01-15 | 威胜信息技术股份有限公司 | Time synchronization method based on novel synchronous sequence |
| CN109218247B (en) * | 2018-11-27 | 2020-11-24 | 威胜信息技术股份有限公司 | Timing synchronization method based on novel synchronization sequence |
| CN112398566A (en) * | 2020-11-16 | 2021-02-23 | 中国电子科技集团公司第二十九研究所 | High-precision arrival time calculation method and device for burst communication system |
| CN112398566B (en) * | 2020-11-16 | 2022-05-24 | 中国电子科技集团公司第二十九研究所 | High-precision arrival time calculation method and device for burst communication system |
| CN112702296A (en) * | 2020-12-18 | 2021-04-23 | 上海微波技术研究所（中国电子科技集团公司第五十研究所） | FPGA (field programmable Gate array) realization method and system for data synchronization parallelization in millimeter wave communication |
| CN114765528A (en) * | 2021-01-15 | 2022-07-19 | 烽火通信科技股份有限公司 | Frame synchronization method, device, equipment and readable storage medium |
| CN114765528B (en) * | 2021-01-15 | 2023-09-26 | 烽火通信科技股份有限公司 | Frame synchronization method, device, equipment and readable storage medium |
| CN115333571A (en) * | 2022-06-22 | 2022-11-11 | 飞芯智控(西安)科技有限公司 | Synchronous processing method and device of frequency hopping communication system |
| CN115333571B (en) * | 2022-06-22 | 2023-12-19 | 飞芯智控(成都)科技有限公司 | Synchronous processing method and device for frequency hopping communication system |
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