CN101001232A - Sending method and system for synchronous signal - Google Patents
Sending method and system for synchronous signal Download PDFInfo
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- CN101001232A CN101001232A CN 200610000537 CN200610000537A CN101001232A CN 101001232 A CN101001232 A CN 101001232A CN 200610000537 CN200610000537 CN 200610000537 CN 200610000537 A CN200610000537 A CN 200610000537A CN 101001232 A CN101001232 A CN 101001232A
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Abstract
This invention discloses a sending method and system, in which, the method includes: setting synchronous sequence H1 with good auto-correlation property, synchronous sequence H2 with good auto correlation property and strong mutual correlation property with H1 and H3 containing several pilot frequencies in scattered spectrums and transmitting H1, H2 and H3 orderly in terms of set powers, which can increase accuracy of time synchronization in the radio communication and accuracy of carrier frequency deviation estimation.
Description
Technical field
The present invention relates to the synchronizing signal treatment technology in the wireless communication system, particularly a kind of launching technique of synchronizing signal and system.
Background technology
OFDM (OFDM) is the Main physical layer technology of next generation wireless communication system.The frequency response curve of wireless channel is non-flat forms mostly, and the main thought of OFDM technology is divided into many orthogonal sub-channels with given channel exactly in frequency domain, uses a subcarrier to modulate on each subchannel, and each subcarrier parallel transmission.Like this, although total channel be non-flat forms, have frequency selectivity, but each subchannel is a relatively flat, what carry out on each subchannel is narrow band transmission, and signal bandwidth is less than the respective bandwidth of channel, so the just interference between the erasure signal waveform greatly.And because the subcarrier of each subchannel is mutually orthogonal in the ofdm system, their frequency spectrum is overlapped, has not only reduced the phase mutual interference between subcarrier, has improved the availability of frequency spectrum simultaneously again.
Because the output signal of ofdm system is the stack of the subchannel of a plurality of mutual coverings, the orthogonality between them has strict requirement, and this makes ofdm system to having relatively high expectations synchronously again, and is very responsive to time synchronized and carrier frequency shift.Asynchronism(-nization) step in the transmission, carrier frequency shift can make the orthogonality between the ofdm system subcarrier be destroyed, make to produce between the subchannel and disturb, thereby introduce serious inter-carrier interference (ICI), cause the effective signal-to-noise ratio (SNR) of system to descend system performance degradation.
In time of the wireless communication system that adopts OFDM technology during coarse synchronization method, for thick synchronizing process, transmitting terminal can adopt the synchronizing pilot sequence of being made up of two identical sub-synchronizing pilot sequence H1 and H2 shown in Figure 1, and these two sequences are the sequences on the frequency domain; For receiving terminal, can successively receive two sub-synchronizing pilot sequences of H1 and H2, carry out time synchronized according to the correlation of these two sub-synchronizing pilot sequences.The processing procedure of thick time synchronized can be referring to the thick synchronization principles schematic diagram shown in Fig. 2: receiving terminal successively receives H1 and the H2 after the delay, after H1 and H2 are added up, carries out peak value again and detects the output time sync bit.
But, be the delay relevant treatment of two same sections because this scheme adopts, owing to postpone correlation peak that the defective of relevant treatment is a time synchronized and not obvious, be difficult to find accurately the top, cause timing tracking accuracy poor.The error ratio of time synchronized is bigger.
When the frequency offset method of the wireless communication system that adopts the OFDM technology, for the decline that makes effective signal-to-noise ratio (SNR) less than 0.1dB, ofdm system requires maximum frequency deviation to be less than 1% of subcarrier spacing.OFDM adopts advanced line frequency offset detection and estimates frequency offseting value, carries out the problem that frequency compensated mode solves frequency shift (FS) then.Projection method for frequency deviation has three kinds, mainly comprises according to synchronization blocks special-purpose in the OFDM frame analyzing, and analyzes and utilize the characteristic of OFDM symbol or frequency spectrum to analyze etc. according to the signal of Fourier transform (FFT) output.
First kind of frequency offset estimation methods proposes to send two identical OFDM symbols, carries out Frequency offset estimation at receiving terminal according to the output of FFT, but this method is only applicable to the situation of estimated frequency skew less than 0.5 subcarrier spacing.
Second kind of frequency offset estimation methods proposes to adopt two identical short OFDM symbols and a long OFDM symbol to carry out Frequency offset estimation, according to difference to systematic influence, frequency deviation can be divided into two parts: the fractional part of frequency shift (FS), it is the frequency deviation of the little several times of subcarrier spacing, with the integer part of frequency shift (FS), i.e. the frequency deviation of subcarrier integral multiple.Correspondingly, frequency compensation can be divided into two stages, i.e. the integer part of the fractional part of compensating frequency skew and compensating frequency skew.
The third frequency offset estimation methods has proposed to carry out based on the single-frequency pilot tone method of Frequency offset estimation, promptly cause the frequency spectrum shift of pilot frequency sequence according to carrier frequency shift, the design pilot frequency sequence has the pectination frequency spectrum, thereby can estimate frequency domain skew, show frequency spectrum based on the synchronizing signal of single-frequency pilot tone as Fig. 3.But this scheme maximum can detected Frequency offset estimation be at interval 0.5 times of pectination frequency, if carrier frequency shift surpasses this scope, then this algorithm can not accurately detect frequency shift (FS).The precision of this algorithm Frequency offset estimation only is a subcarrier spacing.Lower for multicarrier system, may significantly introduce inter-carrier interference.
In sum, the precision of the precision of time synchronized, Carrier frequency offset estimation is not accurate enough in the ofdm system at present, and the Carrier frequency offset estimation scope is less.
Summary of the invention
In view of this, main purpose of the present invention is to provide on the one hand a kind of launching technique of synchronizing signal, adopts the synchronizing signal of this method emission can improve the precision of time synchronized in the wireless communication system and the precision of Carrier frequency offset estimation.
Another aspect of the present invention provides a kind of emission system of synchronizing signal, adopts the synchronizing signal of this system's emission can improve the precision of time synchronized in the wireless communication system and the precision of Carrier frequency offset estimation.
According to above-mentioned purpose, technical scheme of the present invention is achieved in that
A kind of launching technique of synchronizing signal, it is characterized in that, this method comprises: synchronizing sequence H1 with good autocorrelation performance is set respectively, has good autocorrelation performance and have the synchronizing sequence H2 of strong their cross correlation and the sequence H3 that discrete spectrum comprises several single-frequency pilot tones with synchronizing sequence H1, set synchronizing sequence H1, synchronizing sequence H2 and sequence H3 are sent by the power of setting respectively successively.
Described synchronizing sequence H2 sends the back at synchronizing sequence H1 and is provided with.
Described sequence H3 sends the back at synchronizing sequence H2 and is provided with.
Described synchronizing sequence H1, synchronizing sequence H2 and sequence H3 carry out periodic transmission according to setting the antenna of cycle by the wireless communication system transmitting terminal.
Described synchronizing sequence H1 is identical with synchronizing sequence H2.
Described synchronizing sequence H1 with good autocorrelation performance has sharp-pointed peak value with the auto-correlation function with synchronizing sequence H2 of good autocorrelation performance on 0 on coordinate.
Described synchronizing sequence H1 and have sharp-pointed peak value on 0 on coordinate with cross-correlation function that synchronizing sequence H1 has a synchronizing sequence H2 of strong their cross correlation.
The frequency of several single-frequency pilot tones that the discrete spectrum of described sequence H3 comprises is discontinuous.
Frequency interval between several single-frequency pilot tones that the discrete spectrum of described sequence H3 comprises is greater than the coherence bandwidth of wireless communication system channel.
Several frequencies in the discrete spectrum of described sequence H3 except described several single-frequency pilot tones are the discrete spectral line of 0 amplitude.
Frequency interval between several single-frequency pilot tones that the discrete spectrum of described sequence H3 comprises equates or is unequal.
Described synchronizing sequence H1 is the pseudo random sequence of multiple random sequence, time domain, the m sequence or the multiple m sequence of time domain;
Described synchronizing sequence H2 is the pseudo random sequence of multiple random sequence, time domain, the m sequence or the multiple m sequence of time domain.
Each frequency has identical amplitude respectively in the discrete spectrum of described synchronizing sequence H1 and synchronizing sequence H2.
In the discrete spectrum of described synchronizing sequence H1 and synchronizing sequence H2, be the discrete spectral line of 0 amplitude at a part of frequency place that sets respectively, have greater than 0 amplitude and the identical discrete spectral line of amplitude at all the other frequency places that set.
A kind of emission system of synchronizing signal, this system comprises:
The sequence H1 that is provided with and be merged into one road signal by Multiplexing Unit with sequence H2 that sequence H1 has a strong their cross correlation with good autocorrelation performance; The sequence H3 that the road signal that power adjustment unit merges sequence H1 and sequence H2 and the discrete spectrum of setting comprise some single-frequency pilot tones multiply by power respectively and adjusts coefficient, obtains the adjusted two paths of signals of power; Be merged into one tunnel synchronized transmissions signal by another Multiplexing Unit again through the adjusted two paths of signals of overpower; The road synchronized transmissions signal that merges is sent by transmitting antenna more successively by entering transmitting antenna behind D/A D/A converter and the power amplifier.
The road signal times that described sequence H1 and H2 merge with power to adjust coefficient identical or different with the power adjustment coefficient that sequence H3 multiply by.
Described transmitting antenna periodically sends one tunnel synchronized transmissions signal of described merging according to the cycle that sets.
From such scheme as can be seen, the present invention resets two sequences being used to carry out time synchronized and a sequence of carrier frequency shift, two sequences of carrying out time synchronized of resetting can improve the precision of time synchronized in the wireless communication system, a sequence of carrying out carrier frequency shift of resetting can improve the precision of Carrier frequency offset estimation in the wireless communication system, the present invention launches these set three sequences as synchronizing signal, adopt the synchronizing signal of method and system emission of the present invention can improve the precision of time synchronized in the wireless communication system and the precision of Carrier frequency offset estimation thereby make.
Description of drawings
Fig. 1 is a synchronizing pilot sequential structure schematic diagram.
Fig. 2 is thick synchronizing process schematic diagram.
Fig. 3 is the spectrum diagram based on the synchronizing signal of single-frequency pilot tone.
Fig. 4 is the signal schematic representation that the present invention launched.
Fig. 5 (a) is the schematic diagram of H1 of the present invention and H2.
Fig. 5 (b) is embodiment one schematic diagram of H3 of the present invention.
Fig. 6 is the schematic diagram of the autocorrelation performance embodiment one of H1 of the present invention and H2.
Fig. 7 is when having added Frame behind H1 and H2, utilizes the schematic diagram of the resultant decision value of time-delay correlation technique detection Frame original position of two sliding windows.
Fig. 8 is L of the present invention
26,26The autocorrelation performance schematic diagram of sequence.
Fig. 9 is L
26,26Sequence utilizes the time-delay correlation technique of two sliding windows to detect the schematic diagram of the resulting decision value of Frame original position.
Figure 10 is embodiment two schematic diagrames of H3 of the present invention.
Figure 11 is the complete data frame structure schematic diagram that comprises synchronous head.
Figure 12 carries out the output result schematic diagram of synchronous detecting for the present invention utilizes H1, H2 and H3 in the Frame to it.
Figure 13 is the emission system schematic diagram of synchronizing signal of the present invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, below lift specific embodiment and, the present invention is described in more detail with reference to accompanying drawing.
In order to improve the precision of time synchronized in the wireless communication system, the present invention is provided with two synchronizing sequences that have strong their cross correlation and have good autocorrelation performance, and these two synchronizing sequences can be identical.These two synchronizing sequences that are provided with are used for emitted power and can adjust accordingly according to the actual needs of wireless communication system.
In order to improve the precision of Carrier frequency offset estimation in the wireless communication system, the present invention is provided with a discrete spectrum and only just comprises effective frequency component at several discontinuous frequency places, and be the sequence of the discrete spectral line of 0 amplitude at other frequency, this frequency component that is positioned at discontinuous frequency place is called the single-frequency pilot tone.Single-frequency pilot tone in this sequence that is provided with and be used for emitted power and can adjust according to the actual needs of wireless communication system.
When emission, these three sequences are launched successively as synchronizing signal.The signal of being launched as shown in Figure 4, Fig. 4 is the signal schematic representation that the present invention launched, wherein H1 and H2 are exactly two set synchronizing sequences that have strong their cross correlation and have good autocorrelation performance, H3 set just comprises the single-frequency pilot tone at several discontinuous frequency places, and is the sequence of the discrete spectral line of 0 amplitude at other frequency.In when emission, can the setting-up time cycle, periodically send sequence shown in Figure 4 according to the time cycle that sets.
H1 and H2 can adopt diverse ways to generate, and can be respectively pseudorandom (PN) sequence, multiple PN sequence or the multiple m sequence of the time domains such as maximum length (m) sequence, Gold sequence of time domain as H1 and H2; Can also be for having the multiple PN sequence of the spectrum signature shown in Fig. 5 (a), promptly this sequence each frequency component in frequency spectrum all has identical spectrum amplitude on frequency domain.H3 can be the sequence shown in Fig. 5 (b).
In the present invention, the effect of H1 and H2 is to utilize their time domain delay correlation properties to realize thick time synchronized, utilizes their time domain autocorrelation performance to realize smart time synchronized simultaneously.In addition, H3 is used for finishing the estimation of carrier frequency shift.
Below how H1 and H2 are improved thick timing tracking accuracy, the precision how H3 improves Carrier frequency offset estimation is elaborated.
Suppose that H1 and H2 adopt the m sequence of 128 time domain as described below: 10,000,101,10/,001,011,101,0/1,101,100,000,/11,001,101,01/,001,110,011,1/1 01,101,000,0/1,010,101,111,/10,100,101,00/,011,011,100,0/1,111,111,000,/01 11011110/0101100100/10000000, wherein 0 and 1 correspondence is logical value.The autocorrelation performance of this sequence as shown in Figure 6, the lasting duration of supposing H1 and H2 is T, after then the auto-correlation function value of 0 position correspondence of coordinate was exactly H1 and H2 sequence delays T in Fig. 6, institute can detected peak value according to method shown in Figure 2.Fig. 7 shows when having added Frame behind H1 and H2, utilize the schematic diagram of the resultant decision value of time-delay correlation technique detection Frame original position of two sliding windows, as seen from Figure 7, the amplitude of whole waveform is [0,1] in the scope, the peak value of Frame starting position is very clear, thereby can obtain the good estimation of data frame head original position according to H1 and H2.
When H1 and H2 when having the multiple PN sequence of the spectrum signature shown in Fig. 5 (a), adopt the long training symbol of setting in the 802.11a standard, i.e. L
26,26=1,1 ,-1 ,-1,1 ,-1 ,-1,1,1,1,1,1,1 ,-1 ,-1,1,1 ,-1,1 ,-1,1,1,1,1,0,1 ,-1 ,-1,1,1 ,-1,1 ,-1,1 ,-1 ,-1 ,-1 ,-1 ,-1,1,1 ,-1 ,-1,1 ,-1,1 ,-1,1,1,1,1}.This L
26,26Corresponding is the expression values of 53 subcarriers at frequency domain, what element wherein " 0 " was corresponding is DC component, in fact for 64 subcarriers of defined in the 802.11a standard, other 11 sub-spectrum of carrier amplitudes all are 0 except 53 above-mentioned subcarriers.This shows that this sequence amplitude except that a handful of frequency place in whole frequency is 0, the amplitude at other frequency place is all greater than 0, can satisfy among the present invention the requirement to the spectral characteristic of H1 and H2.This L
26,26Sequence just can obtain its corresponding time domain sequences through 64 after Fourier (IFFT) conversion, promptly obtain H1 and H2.At this moment, this L
26,26The autocorrelation performance of sequence is as shown in Figure 8: this sequence is in its whole frequency band scope, though it is 0 that the frequency component at some frequency places is arranged, it is very smooth that but entire spectrum remains, this is similar to the spectral characteristic of white Gaussian noise, thereby the auto-correlation function of its corresponding time domain sequences has the sharp-pointed peak feature that is similar to impulse function, promptly has good autocorrelation performance.For the autocorrelation performance of the m sequence of time domain shown in Figure 6, the secondary lobe in the auto-correlation function shown in Figure 8 is littler, as seen has than the better time domain autocorrelation performance of the m sequence of time domain with the smooth time domain sequences that frequency domain sequence produced of frequency spectrum.
In the present invention, the frequency component at some frequency places of H1 and H2 can be 0, as for the frequency component at which frequency place be 0 and the tolerance frequency component be 0 frequency number how much be to determine according to the concrete application of wireless communication system.
Owing to use L
26,26The time domain sequences that sequence produced is plural number, therefore suppose that noise is multiple Gauss's white noise, when signal to noise ratio is 10dB, utilize the time-delay correlation technique of two sliding windows to detect the resulting decision value of Frame original position as shown in Figure 9, wherein the pairing moment of peak value is the original position of synchronizing sequence H1, the just beginning of frame data.
From Fig. 6 or Fig. 8 as can be seen, the H1 of setting of the present invention and the auto-correlation function of H2 have the sharp-pointed peak value feature that is similar to impulse function at 0.
Below the characteristic of H3 of the present invention is carried out detail analysis.
H3 shown in Fig. 5 (b) has only adopted 3 single-frequency pilot tones, and wherein the frequency interval between the single-frequency pilot tone is 4 subcarrier spacings, and other frequency except the single-frequency pilot tone all is the discrete spectral line of 0 amplitude.The frequency interval between the quantity of single-frequency pilot tone, the single-frequency pilot tone and the power of single-frequency pilot frequency components can correspondingly be adjusted as required yet in actual applications.As shown in figure 10, being used between the single-frequency pilot tone of frequency spectrum of H3 of frequency offset estimating also can be unequal interval, so just can further overcome the ambiguity of the Frequency offset estimation that the frequency selective fading owing to channel causes.In addition, by the frequency over-sampling processing method of prior art, this frequency estimating methods can also enlarge the scope of Frequency offset estimation, and not only is confined at interval 0.5 times of single-frequency pilot carrier frequency.
Comprise four single-frequency pilot tones in the frequency spectrum of H3 shown in Figure 10, the interval between each single-frequency pilot tone is respectively 3,4 and 5 subcarrier spacings.Adopt H1 and the H2 shown in Fig. 5 (a), and adopt H3 shown in Figure 10, just can obtain comprising the complete data frame structure of synchronous head, this synchronous head is H1, H2 and H3 just, as shown in figure 11.The frequency shift (FS) of supposing wireless communication system is-3.16 subcarrier spacings, in order to realize the related offset estimated accuracy, the oversample factor that makes frequency is 32, then utilize H1, H2 in the Frame and H3 as shown in figure 12 to its output result who carries out synchronous detecting, described synchronization detection process can adopt prior art to carry out, and wherein first width of cloth figure utilizes to postpone the result that correlation technique is realized thick time synchronized; Second width of cloth figure is the output waveform of the Frequency offset estimation that obtains behind 32 times of over-samplings; The 3rd width of cloth figure utilizes local sequence that produces of receiving terminal and H1 and H2 to carry out the output waveform of resulting smart time synchronized behind the related operation, the peak correspondence be the original position of the Frame that detects, the abscissa correspondence be the deviant that the detected original position of smart time synchronized obtains with respect to the resulting Frame original position of thick time synchronized, for " 1 " value that is identified among Figure 12, illustrate that the resulting testing result of thick time synchronized has been offset one to the right than physical location, therefore in smart time synchronized testing process this mistake is proofreaied and correct, corresponding Frame original position has then been adjusted one left.
H1, the H2 and the H3 that are provided with are according to the method described in the present invention gone out by the antenna transmission of wireless communication system transmitting terminal successively, thereby realize adopting the synchronizing signal of method emission provided by the invention to improve the precision of time synchronized in the wireless communication system and the precision of Carrier frequency offset estimation.
Figure 13 is the emission system schematic diagram of synchronizing signal of the present invention, and as shown in figure 13: at first, the sequence H2 that has the sequence H1 of good autocorrelation performance and have strong their cross correlation with it is merged into one road signal by Multiplexing Unit; Then, power adjustment unit is according to the requirement of practical communication system, and the sequence H3 that road signal to sequence H1 and sequence H2 after multiplexing and discrete spectrum comprise some single-frequency pilot tones multiply by power respectively and adjusts coefficient a1 and a2, finishes the adjustment of power; Be merged into one tunnel synchronized transmissions signal by a Multiplexing Unit again through the adjusted two paths of signals of overpower; At last, one tunnel synchronized transmissions signal is more successively by entering transmitting antenna behind D/A (D/A) transducer and the power amplifier, and sent by transmitting antenna.
Described power adjustment coefficient a1 and a2 are identical or different.Transmitting antenna can periodically send one tunnel synchronized transmissions signal of described merging according to the cycle that sets.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (17)
1, a kind of launching technique of synchronizing signal, it is characterized in that, this method comprises: synchronizing sequence H1 with good autocorrelation performance is set respectively, has good autocorrelation performance and have the synchronizing sequence H2 of strong their cross correlation and the sequence H3 that discrete spectrum comprises several single-frequency pilot tones with synchronizing sequence H1, set synchronizing sequence H1, synchronizing sequence H2 and sequence H3 are sent by the power of setting respectively successively.
2, the method for claim 1 is characterized in that, described synchronizing sequence H2 sends the back at synchronizing sequence H1 and is provided with.
3, method as claimed in claim 1 or 2 is characterized in that, described sequence H3 sends the back at synchronizing sequence H2 and is provided with.
4, the method for claim 1 is characterized in that, described synchronizing sequence H1, synchronizing sequence H2 and sequence H3 carry out periodic transmission according to setting the antenna of cycle by the wireless communication system transmitting terminal.
5, the method for claim 1 is characterized in that, described synchronizing sequence H1 is identical with synchronizing sequence H2.
6, the method for claim 1 is characterized in that, described synchronizing sequence H1 with good autocorrelation performance has sharp-pointed peak value with the auto-correlation function with synchronizing sequence H2 of good autocorrelation performance on 0 on coordinate.
7, the method for claim 1 is characterized in that, described synchronizing sequence H1 and have sharp-pointed peak value on 0 on coordinate with cross-correlation function that synchronizing sequence H1 has a synchronizing sequence H2 of strong their cross correlation.
8, the method for claim 1 is characterized in that, the frequency of several single-frequency pilot tones that the discrete spectrum of described sequence H3 comprises is discontinuous.
9, the method for claim 1 is characterized in that, the frequency interval between several single-frequency pilot tones that the discrete spectrum of described sequence H3 comprises is greater than the coherence bandwidth of wireless communication system channel.
10, the method for claim 1 is characterized in that, several frequencies in the discrete spectrum of described sequence H3 except described several single-frequency pilot tones are the discrete spectral line of 0 amplitude.
11, the method for claim 1 is characterized in that, the frequency interval between several single-frequency pilot tones that the discrete spectrum of described sequence H3 comprises equates or be unequal.
12, the method for claim 1 is characterized in that, described synchronizing sequence H1 is the pseudo random sequence of multiple random sequence, time domain, the m sequence or the multiple m sequence of time domain;
Described synchronizing sequence H2 is the pseudo random sequence of multiple random sequence, time domain, the m sequence or the multiple m sequence of time domain.
13, the method for claim 1 is characterized in that, each frequency has identical amplitude respectively in the discrete spectrum of described synchronizing sequence H1 and synchronizing sequence H2.
14, the method for claim 1, it is characterized in that, in the discrete spectrum of described synchronizing sequence H1 and synchronizing sequence H2, be the discrete spectral line of 0 amplitude at a part of frequency place that sets respectively, have greater than 0 amplitude and the identical discrete spectral line of amplitude at all the other frequency places that set.
15, a kind of emission system of synchronizing signal is characterized in that, this system comprises:
The sequence H1 that is provided with and be merged into one road signal by Multiplexing Unit with sequence H2 that sequence H1 has a strong their cross correlation with good autocorrelation performance; The sequence H3 that the road signal that power adjustment unit merges sequence H1 and sequence H2 and the discrete spectrum of setting comprise some single-frequency pilot tones multiply by power respectively and adjusts coefficient, obtains the adjusted two paths of signals of power; Be merged into one tunnel synchronized transmissions signal by another Multiplexing Unit again through the adjusted two paths of signals of overpower; The road synchronized transmissions signal that merges is sent by transmitting antenna more successively by entering transmitting antenna behind D/A D/A converter and the power amplifier.
16, system as claimed in claim 15 is characterized in that, the road signal times that described sequence H1 and H2 merge with power to adjust coefficient identical or different with the power adjustment coefficient that sequence H3 multiply by.
17, system as claimed in claim 15 is characterized in that, described transmitting antenna periodically sends one tunnel synchronized transmissions signal of described merging according to the cycle that sets.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009082940A1 (en) * | 2007-12-19 | 2009-07-09 | Huawei Technologies Co., Ltd. | Method, system and apparatus for transmitting, receiving sync sequence |
| CN103546416A (en) * | 2013-07-12 | 2014-01-29 | 上海数字电视国家工程研究中心有限公司 | Ofdm symbol synchronization method |
| CN105009655A (en) * | 2012-11-05 | 2015-10-28 | Lg电子株式会社 | Method and device for generating synchronization signal in wireless access system supporting ultrahigh frequency band |
| WO2016054999A1 (en) * | 2014-10-07 | 2016-04-14 | Mediatek Inc. | Signal format for cell search and synchronization in wireless networks |
| CN107294654A (en) * | 2016-04-13 | 2017-10-24 | 大唐联仪科技有限公司 | A kind of preamble detecting method and LTE comprehensive test instruments based on LTE comprehensive test instruments |
| CN110311877A (en) * | 2019-07-05 | 2019-10-08 | 北京神经元网络技术有限公司 | More sub-band signal transmission methods, device, equipment and medium |
| CN110463080A (en) * | 2017-08-09 | 2019-11-15 | 华为技术有限公司 | A kind of pilot frequency processing method and device, system |
| CN111193681A (en) * | 2019-02-28 | 2020-05-22 | 成都坤恒顺维科技股份有限公司 | Time synchronization method based on high-precision data transmission |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009082940A1 (en) * | 2007-12-19 | 2009-07-09 | Huawei Technologies Co., Ltd. | Method, system and apparatus for transmitting, receiving sync sequence |
| CN101465830B (en) * | 2007-12-19 | 2012-10-17 | 华为技术有限公司 | Method, system and device for sending and receiving synchronous information |
| CN105009655A (en) * | 2012-11-05 | 2015-10-28 | Lg电子株式会社 | Method and device for generating synchronization signal in wireless access system supporting ultrahigh frequency band |
| CN105009655B (en) * | 2012-11-05 | 2019-12-03 | Lg 电子株式会社 | The method and apparatus of synchronization signal are generated in the wireless access system for supporting SHF band |
| CN103546416A (en) * | 2013-07-12 | 2014-01-29 | 上海数字电视国家工程研究中心有限公司 | Ofdm symbol synchronization method |
| CN103546416B (en) * | 2013-07-12 | 2016-12-28 | 上海数字电视国家工程研究中心有限公司 | Ofdm symbol synchronization method |
| CN106797362A (en) * | 2014-10-07 | 2017-05-31 | 联发科技股份有限公司 | For cell search in wireless network and the signal format of synchronization |
| WO2016054999A1 (en) * | 2014-10-07 | 2016-04-14 | Mediatek Inc. | Signal format for cell search and synchronization in wireless networks |
| CN107294654A (en) * | 2016-04-13 | 2017-10-24 | 大唐联仪科技有限公司 | A kind of preamble detecting method and LTE comprehensive test instruments based on LTE comprehensive test instruments |
| CN107294654B (en) * | 2016-04-13 | 2020-10-27 | 大唐联仪科技有限公司 | Frame header detection method based on LTE comprehensive tester and LTE comprehensive tester |
| CN110463080A (en) * | 2017-08-09 | 2019-11-15 | 华为技术有限公司 | A kind of pilot frequency processing method and device, system |
| CN110463080B (en) * | 2017-08-09 | 2021-01-08 | 华为技术有限公司 | Pilot frequency processing method, device and system |
| CN111193681A (en) * | 2019-02-28 | 2020-05-22 | 成都坤恒顺维科技股份有限公司 | Time synchronization method based on high-precision data transmission |
| CN110311877A (en) * | 2019-07-05 | 2019-10-08 | 北京神经元网络技术有限公司 | More sub-band signal transmission methods, device, equipment and medium |
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