CN101790231A - Synchronous method, device and system for wireless transmission - Google Patents
Synchronous method, device and system for wireless transmission Download PDFInfo
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- CN101790231A CN101790231A CN200910001155A CN200910001155A CN101790231A CN 101790231 A CN101790231 A CN 101790231A CN 200910001155 A CN200910001155 A CN 200910001155A CN 200910001155 A CN200910001155 A CN 200910001155A CN 101790231 A CN101790231 A CN 101790231A
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Abstract
The embodiment of the invention discloses a synchronous method, a synchronous device and a synchronous system for wireless transmission, which relate to the field of communications. The method comprises the following steps: determining one or more candidate synchronous channels without narrow band interference from a plurality of candidate synchronous channels through a transmitting terminal; determining at least one actual synchronous channel from the candidate synchronous channels without the narrow band interference; transmitting synchronous signals on the actual synchronous channel; acquiring the signals transmitted by each candidate synchronous channel by the receiving terminal; determining the actual synchronous channel according to the signals transmitted by the candidate synchronous channels; and performing synchronization according to the synchronous signals transmitted by the actual synchronous channel. Therefore, when a part of bandwidth wireless transmission has no authorized frequency bands, the bandwidth without the narrow band interference can be flexibly used for transmitting the synchronous signals without consuming additional wireless frequency spectrum resources.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of method for synchronous, Apparatus and system of wireless transmission.
Background technology
At present, in order to improve the availability of frequency spectrum, the fixed allocation frequency spectrum is changed for the frequency spectrum occupation mode of specific wireless transmitting system, and different wireless transmitting systems takies frequency spectrum resource dynamically under non-interfering prerequisite frequency spectrum occupation mode will be widely adopted.In fact, in same section frequency spectrum, may there be wideband data and narrow band data simultaneously, therefore, for fear of interference to the transmission of narrowband systems signal, improve the availability of frequency spectrum of this frequency range simultaneously, transmission system is not transmitted the broadband system signal on the subcarrier of transmission narrowband systems signal in this frequency range, such transmission system is called as part bandwidth for transmission system.
The synchronization scenario of part bandwidth for transmission system can be with reference to LTE (Long Term Evolution at present, Long Term Evolution) synchronization scenario of system, be specially: the LTE requirement of system design is the bandwidth varying transmission system, and for example the LTE system can adopt the transmission bandwidth transmission signals of 1.25MHz, 2.5MHz, 5MHz, 10MHz, 15MHz and 20MHz.Above-mentioned which kind of the transmission bandwidth transmission signals of the actual employing of LTE system no matter, the LTE system all sends synchronizing signal on the frequency range of 1.25MHz bandwidth that with its center frequency point is the center.1.25MHz, the pairing total number of sub-carriers of transmission bandwidth of 2.5MHz, 5MHz, 10MHz, 15MHz and 20MHz is respectively 128,256,512,1024,1536 and 2048, transmitting terminal is selected 62 sub-carrier transmission synchronizing signals from 72 subcarriers at center, and the data on the synchronizing signal on these 62 subcarriers and other carrier wave are obtained baseband signal by modulation.After receiving terminal receives this baseband signal, leach these 62 subcarriers and upload defeated synchronizing signal, do simultaneous operation.
In addition, the synchronization scenario of part bandwidth for transmission system can also utilize other frequency range beyond the transmission channel as broadcast channel for: transmitting terminal, and the transmitting terminal of broadcast system is to the public informations such as occupation mode of subcarrier; Receiving terminal is determined the transmission channel of synchronous signal transmission according to the occupation mode of transmitting terminal to subcarrier, obtains synchronizing signal from this transmission channel, carries out simultaneous operation.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art: the frequency range that with the center frequency point is the 1.25MHz bandwidth at center is the mandate frequency range of LTE system, promptly this frequency range is preferentially used by the LTE system, does not exist other authoring system to take the problem of this frequency range.But may not authorize frequency range in the part bandwidth for transmission candidate's of system the frequency range, if synchronous signal transmission on the frequency range of 1.25MHz bandwidth that with the center frequency point is the center still, when this frequency range was taken by other system, part bandwidth for transmission system can't send synchronizing signal and carry out synchronously.
In addition, when part bandwidth for transmission system utilizes other band transmissions public information beyond the transmission channel, need to consume extra radio spectrum resources.
Summary of the invention
Embodiments of the invention provide a kind of method for synchronous, Apparatus and system of wireless transmission, can make full use of the frequency range that does not have mandate, make part bandwidth for transmission system carry out under the situation that does not consume extra frequency spectrum resource synchronously.
For achieving the above object, embodiments of the invention adopt following technical scheme:
A kind of method for synchronous of wireless transmission comprises:
From a plurality of candidate's synchronizing channels, determine one or more candidate's synchronizing channels that do not have narrow band interference;
From the described candidate's synchronizing channel that does not have a narrow band interference, determine at least one actual synchronization channel;
In described actual synchronization channel synchronizing signal.
A kind of synchronizer of wireless transmission comprises:
Candidate's synchronizing channel determining unit is used for determining one or more candidate's synchronizing channels that do not have narrow band interference from a plurality of candidate's synchronizing channels;
The actual synchronization channels determining unit is used for determining at least one actual synchronization channel from the described candidate's synchronizing channel of narrow band interference that do not exist;
The synchronizing signal transmission unit is used in described actual synchronization channel synchronizing signal.
A kind of method for synchronous of wireless transmission comprises:
Obtain the signal of each candidate's synchronization channel transmissions;
Determine the actual synchronization channel according to the signal of described candidate's synchronization channel transmissions;
Synchronizing signal according to described actual synchronization Channel Transmission is carried out synchronously.
A kind of synchronizer of wireless transmission comprises:
The candidate signal acquiring unit is used to obtain the signal of each candidate's synchronization channel transmissions;
The synchronizing channel determining unit is used for determining the actual synchronization channel according to the signal of described candidate's synchronization channel transmissions;
Synchronous processing unit is used for carrying out synchronously according to the synchronizing signal of described actual synchronization Channel Transmission.
A kind of synchro system of wireless transmission comprises emitter and receiving system;
Wherein said emitter, be used for determining one or more candidate's synchronizing channels that do not have narrow band interference from a plurality of candidate's synchronizing channels, from the described candidate's synchronizing channel that does not have a narrow band interference, determine at least one actual synchronization channel, in described actual synchronization channel synchronizing signal;
Described receiving system is used to obtain the signal of each candidate's synchronization channel transmissions, determines the actual synchronization channel according to the signal of described candidate's synchronization channel transmissions, carries out synchronously according to the synchronizing signal of described actual synchronization Channel Transmission.
The method for synchronous of the wireless transmission that the embodiment of the invention provides, Apparatus and system, from a plurality of candidate's synchronizing channels, determine one or more candidate's synchronizing channels that do not have narrow band interference by transmitting terminal, from the described candidate's synchronizing channel that does not have a narrow band interference, determine at least one actual synchronization channel, in described actual synchronization channel synchronizing signal; Receiving terminal obtains the signal of each candidate's synchronization channel transmissions, and determines the actual synchronization channel according to the signal of described candidate's synchronization channel transmissions, carries out synchronously according to the synchronizing signal of described actual synchronization Channel Transmission.Therefore, when not authorizing frequency range, can use the bandwidth that does not have narrow band interference to carry out the transmission of synchronizing signal flexibly, and not need to consume extra radio spectrum resources, save the limited wireless frequency spectrum resource in part bandwidth for transmission system.
Description of drawings
Fig. 1 is the method for synchronous schematic diagram of embodiment of the invention wireless transmission;
Fig. 2 is the method for synchronous schematic diagram of the another kind of wireless transmission of the embodiment of the invention;
Fig. 3 is an embodiment of the invention sub-band division method schematic diagram;
Fig. 4 is the another kind of sub-band division method of an embodiment of the invention schematic diagram;
Fig. 5 is the synchronizer pie graph of embodiment of the invention wireless transmission;
Fig. 6 is the synchronizer pie graph of the another kind of wireless transmission of the embodiment of the invention;
Fig. 7 is an embodiment of the invention wireless transmitting system pie graph.
Embodiment
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use is done an introduction simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Embodiment one
In order to make full use of the frequency range that does not have mandate, make part bandwidth for transmission system carry out under the situation that does not consume extra frequency spectrum resource synchronously, the embodiment of the invention provides a kind of method for synchronous of wireless transmission, as shown in Figure 1, the method for synchronous of embodiment of the invention wireless transmission comprises:
101, transmitting terminal is determined one or more candidate's synchronizing channels that do not have narrow band interference from a plurality of candidate's synchronizing channels;
In the present embodiment, transmitting terminal can be the base station in the Cellular Networks, also can be the transmitting node in the mesh network (based on wireless mesh network).Transmitting terminal is determined one or more candidate's synchronizing channels that do not have narrow band interference according to detected narrowband systems signal from a plurality of candidate's synchronizing channels, promptly do not transmit candidate's synchronizing channel of narrowband systems signal.
Before transmitting terminal determines there is not candidate's synchronizing channel of narrow band interference, need part bandwidth for transmission system in maximum transmission bandwidth, to set candidate's synchronizing channel, the assignment procedure of described candidate's synchronizing channel comprises:
A) part bandwidth for transmission system is divided into a plurality of subbands according to the least part transmission bandwidth with maximum transmission bandwidth.
Part bandwidth for transmission system at first determines the sub-band sum that maximum transmission bandwidth is divided, and is that maximum transmission bandwidth is divided subband according to described sub-band sum then, and the bandwidth of described subband all is not less than the least part transmission bandwidth.The required least unit bandwidth that takies when wherein, the least part transmission bandwidth is meant the system transmissions data.
For example, according to the radio band environment of system's maximum transmission bandwidth and system works, the total number of sub-carriers of determining system is N, and N is generally 2 integral number power, as 64,128 ... 2048,4096.Determine the multiple M between maximum transmission bandwidth and the least part transmission bandwidth.
If M is an integer, then maximum transmission bandwidth is divided into M wide subband, each subband comprises N/M subcarrier.For example, the least part transmission bandwidth of system is 1.25MHz, and the maximum transmission bandwidth of system is 20MHz, and then the maximum transmission bandwidth of system is divided into 16 subbands, and each subband comprises 1.25N/20 subcarrier.
If M is not integer, then maximum transmission bandwidth is divided into the individual subband of M ', wherein-2 subbands of M '-1 or M ' are wide subband, and remaining 1 or 2 subbands take remaining bandwidth, and M ' is less than M here, and near the integer of M.For example, the least part transmission bandwidth of system is 1.5MHz, the maximum transmission bandwidth of system is 20MHz, then the maximum transmission bandwidth with system is divided into 13 subbands, 11 wide subbands that subband is 1.5MHz wherein, other 2 subbands that subband is 1.75MHz, perhaps, 12 wide subbands that subband is 1.5MHz wherein, other 1 subband that subband is 2MHz comprises 1.5N/20 subcarrier at least in each subband.
In addition, during the system divides subband, can adopt with the center frequency point is that the mode that the center symmetry is divided is divided subband.The supposing the system center frequency point is f
0, the least part transmission bandwidth is B
m, maximum transmission bandwidth is divided into M subband.
When M was even number, wherein M-1 subband was complete equiband subband, and the sub-bands of frequencies scope at center is [f
0-B
m/ 2, f
0+ B
m/ 2], the frequency range of remaining complete equiband subband is respectively [(f
0+ k B
m)-B
m/ 2, (f
0+ k B
m)+B
m/ 2], k=± 1, ± 2 ..., ± M/2-1, a remaining subband is all assigned to the edge of maximum transmission bandwidth respectively.For example, the least part transmission bandwidth of system is 1.25MHz, and when the maximum transmission bandwidth of system was 20MHz, dividing mode as shown in Figure 3.
When M was odd number, wherein M-2 subband was complete equiband subband, and the sub-bands of frequencies scope at center is [f
0-B
m/ 2, f
0+ B
m/ 2], the frequency range of remaining complete equiband subband is respectively [(f
0+ k B
m)-B
m/ 2, (f
0+ k B
m)+B
m/ 2], k=± 1, ± 2 ..., ± (M-1)/and 2-1, two remaining subbands are all assigned to the edge of maximum transmission bandwidth respectively.
In addition, during the system divides subband, can also divide subband in order from an end of described maximum transmission bandwidth.The subband of equiband is divided in order, and the allocation of subbands of different-bandwidth is at the edge of maximum transmission bandwidth.For example, the least part transmission bandwidth of system is 1.25MHz, and when the maximum transmission bandwidth of system was 20MHz, dividing mode as shown in Figure 4.
B) part bandwidth for transmission system sets candidate's synchronizing signal transmission band as candidate's synchronizing channel in each subband.
When setting candidate's synchronizing channel in each subband, the center frequency range that can select each subband is as candidate's synchronizing channel, and the sub-carrier number I that this candidate's synchronizing channel comprises is not more than the minimum value I of the sub-carrier number that each subband comprises
1
102, transmitting terminal is determined at least one actual synchronization channel from the described candidate's synchronizing channel that does not have a narrow band interference.
Transmitting terminal can select one or more candidate's synchronizing channels as the actual synchronization channel from the described candidate's synchronizing channel that does not have a narrow band interference.
In addition, transmitting terminal can also be chosen the actual synchronization channel under the situation of taking all factors into consideration systematic function and net synchronization capability.When the data business volume that need send at transmitting terminal is big, can choose a spot of candidate's synchronizing channel and carry out the synchronizing signal transmission as the actual synchronization channel, so that more multi-channel resource is used to transmit data, the data business volume that need send at transmitting terminal hour, can choose more candidate's synchronizing channel and carry out the synchronizing signal transmission, thereby obtain better net synchronization capability as the actual synchronization channel.
103, transmitting terminal is in described actual synchronization channel synchronizing signal.
Transmitting terminal is at the predefined synchronizing sequence of described actual synchronization channel.In fact, transmitting terminal to the signal that receiving terminal sends is, the baseband signal that data signals transmitted obtains by the modulation as OFDM (Orthogonal Frequency Division Multiplex, OFDM) on the synchronizing signal of actual synchronization Channel Transmission and other subcarrier.
Part bandwidth for transmission system can also be when setting candidate's synchronizing channel pre-defined synchronizing sequence.If synchronizing sequence length is K, the choosing of K value can be satisfied K and be not more than I, perhaps satisfies 2*K and is not more than I, perhaps satisfies 4*K and is not more than I.Synchronous sequence codes can be selected the good sign indicating number of cross correlation, as PN (Pseudo-random Noise, pseudorandom) sequence, Golay complementary code (Golay complementarycode), CAZAC (Constant Amplitude Zero Auto-Correction, permanent envelope zero auto-correlation) sequence.For the synchronizing sequence on each subband, can adopt independently sequence, also can produce by the corresponding sequence of a long sequence of intercepting.And can choose synchronizing sequence based on obtaining lower PAPR (Peak to AveragePower Rate, peak-to-average power ratio).
In addition, if receiving terminal need obtain the public informations such as occupation mode of transmitting terminal to subcarrier, transmitting terminal can also never exist determines in candidate's synchronizing channel of narrow band interference that at least one candidate's synchronizing channel is as the synchronized broadcasting channel, use this synchronized broadcasting channel by time-multiplexed mode, this synchronized broadcasting channel is transmitted broadcast singal as actual synchronization Channel Transmission synchronizing signal or as broadcast channel, and described broadcast singal carries the public informations such as occupation mode of transmitting terminal to subcarrier.
The method for synchronous of the wireless transmission that the embodiment of the invention one provides, by from a plurality of candidate's synchronizing channels, determining one or more candidate's synchronizing channels that do not have narrow band interference, from the described candidate's synchronizing channel that does not have a narrow band interference, determine at least one actual synchronization channel, and in described actual synchronization channel synchronizing signal, therefore, when frequency range is not authorized by part bandwidth for transmission system, can select not exist candidate's synchronizing channel of narrow band interference to carry out the transmission of synchronizing signal as the actual synchronization channel neatly, avoid producing the narrow band interference of same frequency range, and do not need to consume extra radio spectrum resources, saved the limited wireless frequency spectrum resource
Embodiment two
With embodiment one correspondingly, the embodiment of the invention provides a kind of method for synchronous of wireless transmission, as shown in Figure 2, the method for synchronous of embodiment of the invention wireless transmission comprises:
201, receiving terminal obtains the signal of each candidate's synchronization channel transmissions.
In the present embodiment, receiving terminal can be the terminal in the Cellular Networks, also can be the receiving node in the mesh network.Behind the receiving terminal receiving baseband signal, baseband signal is carried out Filtering Processing, leach the signal of the candidate's synchronization channel transmissions on each subband respectively.At this, the number of filter of receiving terminal configuration is identical with sub-band sum.
202, receiving terminal is determined the actual synchronization channel according to the signal of described candidate's synchronization channel transmissions.
Receiving terminal carries out cross correlation process to the signal that each filter leaches respectively, and the cross-correlation module of carrying out cross correlation process is identical with the number of filter.
At this, can adopt time-domain signal to postpone from method, the local sequence of time domain and time-domain signal received signal cross-correlation method carry out cross correlation process mutually.Adopting time-domain signal to postpone when method is carried out cross correlation process mutually, one of them input of cross-correlation module is the signal x (n) that leaches from candidate's synchronizing channel filter of correspondence, here n＞=0 and n＜=N-1, N is that synchronizing sequence is long, the another one input is the signal x (n-L) that leaches in candidate's synchronizing channel filter of correspondence, and L is the sampling number that synchronizing sequence repeats in time domain.When adopting local sequence of time domain and time-domain signal received signal cross-correlation method, one of them input of cross-correlation module is the signal x (n) that leaches from candidate's synchronizing channel filter of correspondence, another input is the time domain sequences of candidate's synchronization channel sequence of correspondence, and this time domain sequences is kept in the receiving terminal in advance.
Judging cross correlation results, if greater than certain thresholding then be judged as relevantly, otherwise is uncorrelated.If relevant, then receiving terminal thinks that transmitting terminal has adopted this candidate's synchronizing channel as the actual synchronization channel, otherwise receiving terminal filters the signal on this candidate's synchronizing channel as interference, do not use in synchronizing process.
203, receiving terminal carries out according to the synchronizing signal of described actual synchronization Channel Transmission synchronously.
Receiving terminal carries out time synchronized according to the synchronizing signal of described actual synchronization Channel Transmission, and for example, the correlation that obtains according to cross-correlation module obtains time synchronized, and perhaps, (Cyclic Prefix, method CP) obtains time synchronized by Cyclic Prefix.
And receiving terminal carries out Frequency Estimation and compensation according to the signal of actual synchronization Channel Transmission, reaches Frequency Synchronization.
In addition, when transmitting terminal utilizes the synchronized broadcasting channel to realize actual synchronization channel and broadcast channel by time-multiplexed mode, receiving terminal carries out cross correlation process by the signal to the synchronized broadcasting Channel Transmission, according to cross correlation results, when determining that this synchronized broadcasting channel is the actual synchronization channel, carry out Synchronous Processing according to the synchronizing signal of described actual synchronization Channel Transmission.According to cross correlation results, when determining that this synchronized broadcasting channel is not the actual synchronization channel, the broadcast singal of this synchronized broadcasting Channel Transmission is filtered as interference, in synchronizing process, do not use.After system synchronization, this broadcast singal is received termination with data-signal and receives processing.
The method for synchronous of the wireless transmission that the embodiment of the invention two provides, by obtaining the signal of each candidate's synchronization channel transmissions, determine the actual synchronization channel according to the signal of described candidate's synchronization channel transmissions, carry out synchronously according to the synchronizing signal of described actual synchronization Channel Transmission.Therefore, when not authorizing frequency range, can on candidate's synchronizing channel, receive the synchronizing signal that transmitting terminal sends flexibly, and not need to consume extra radio spectrum resources, save the limited wireless frequency spectrum resource in part bandwidth for transmission system.
Method for synchronous below in conjunction with embodiment one and two pairs of wireless transmission of embodiment is done further concrete description.
Embodiment three
The embodiment of the invention provides a kind of method for synchronous of wireless transmission, and the method for synchronous of embodiment of the invention wireless transmission comprises:
301, part bandwidth for transmission system is according to the least part transmission bandwidth, and adopting with the center frequency point is the mode that the center symmetry is divided, and maximum transmission bandwidth is divided into some subbands.On each subband, set candidate's synchronizing signal transmission band as candidate's synchronizing channel.
For example, the maximum transmission bandwidth of supposing the system is 20MHz, and the system centre frequency is 10GHz, and the least part transmission bandwidth is 1.25MHz, and the multiple of maximum transmission bandwidth and least part transmission bandwidth is 16, and then maximum transmission bandwidth is divided into 16 subbands.
16 is even number, as shown in Figure 3, wherein 15 subbands are complete equiband subband, and the sub-bands of frequencies scope at center is [10-1.25/2,10+1.25/2], the frequency range of the equiband subband that remaining is complete is respectively [(10+1.25k)-1.25/2, (10+1.25k)+1.25/2], k=± 1, ± 2, ..., ± 16/2-1, a remaining subband is all assigned to the edge of maximum transmission bandwidth respectively.
In addition, if when the sub band number M that maximum transmission bandwidth is divided is odd number, wherein M-2 subband is complete equiband subband, and the sub-bands of frequencies scope at center is [f
0-B
m/ 2, f
0+ B
m/ 2], the frequency range of remaining complete equiband subband is respectively [(f
0+ k B
m)-B
m/ 2, (f
0+ k B
m)+B
m/ 2], k=± 1, ± 2 ..., ± (M-1)/and 2-1, two remaining subbands are all assigned to the edge of maximum transmission bandwidth respectively.
When setting candidate's synchronizing channel in each subband, the center frequency range that can select each subband is as candidate's synchronizing channel, and the sub-carrier number I that this candidate's synchronizing channel comprises is not more than the minimum value I of the sub-carrier number that each subband comprises
1
Part bandwidth for transmission system is pre-defined synchronizing sequence when setting candidate's synchronizing channel.If synchronizing sequence length is K, the choosing of K value can be satisfied K and be not more than I, perhaps satisfies 2*K and is not more than I, perhaps satisfies 4*K and is not more than I.Synchronous sequence codes can be selected the good sign indicating number of cross correlation, as PN (Pseudo-randomNoise, pseudorandom) sequence, Golay complementary code (Golay complementary code), CAZAC (ConstantAmplitude Zero Auto-Correction, permanent envelope zero auto-correlation) sequence.For the synchronizing sequence on each subband, can adopt independently sequence, also can produce by the corresponding sequence of a long sequence of intercepting.And can choose synchronizing sequence based on obtaining lower PAPR (Peak to Average Power Rate, peak-to-average power ratio).
302, transmitting terminal is determined one or more candidate's synchronizing channels that do not have narrow band interference from a plurality of candidate's synchronizing channels.
In the present embodiment, transmitting terminal and receiving terminal can be respectively base station in the Cellular Networks and the terminal in the Cellular Networks, also can be respectively transmitting node and the receiving nodes in the mesh network (based on wireless mesh network).Transmitting terminal is determined one or more candidate's synchronizing channels that do not have narrow band interference according to detected narrowband systems signal from a plurality of candidate's synchronizing channels, promptly do not transmit candidate's synchronizing channel of narrowband systems signal.
303, transmitting terminal with all candidate's synchronizing channels that do not have narrow band interference as the actual synchronization channel, in described actual synchronization channel synchronizing signal.
Transmitting terminal is at the predefined synchronizing sequence of described actual synchronization channel.In fact, transmitting terminal to the signal that receiving terminal sends is, the baseband signal that data signals transmitted obtains by the modulation as OFDM (Orthogonal Frequency Division Multiplex, OFDM) on the synchronizing signal of actual synchronization Channel Transmission and other subcarrier.
304, receiving terminal obtains the signal of each candidate's synchronization channel transmissions.
Behind the receiving terminal receiving baseband signal, baseband signal is carried out Filtering Processing, leach the signal of the candidate's synchronization channel transmissions on each subband respectively.At this, the number of filter of receiving terminal configuration is identical with sub-band sum.
305, receiving terminal carries out cross correlation process to the signal of described candidate's synchronization channel transmissions, with candidate's synchronizing channel of degree of correlation maximum as the actual synchronization channel.
Receiving terminal carries out cross correlation process to the signal that each filter leaches respectively, and the cross-correlation module of carrying out cross correlation process is identical with the number of filter.The method of cross correlation process can be that time-domain signal postpones from mutual method, the local sequence of time domain and time-domain signal received signal cross-correlation method.
306, receiving terminal carries out according to the synchronizing signal of described actual synchronization Channel Transmission synchronously.
Correlation that receiving terminal obtains according to cross-correlation module or the method by CP obtain time synchronized, and carry out Frequency Estimation and compensation according to the signal of actual synchronization Channel Transmission, reach Frequency Synchronization.
In the present embodiment, owing to utilize all not exist candidate's synchronizing channel of narrow band interference to carry out the transmission of synchronizing signal, and therefrom choose the contrast signal of the highest synchronizing signal of the degree of correlation as simultaneous operation, therefore, can obtain quality synchronizing signal preferably, thereby obtain synchronous effect preferably.
Embodiment four
The embodiment of the invention also provides a kind of method for synchronous of wireless transmission, and the method for synchronous of embodiment of the invention wireless transmission comprises:
401, part bandwidth for transmission system divides subband in order from an end of described maximum transmission bandwidth.On each subband, set candidate's synchronizing signal transmission band as candidate's synchronizing channel.
For example, the maximum transmission bandwidth of supposing the system is 20MHz, and the least part transmission bandwidth is 1.25MHz, and the multiple of maximum transmission bandwidth and least part transmission bandwidth is 16, and then maximum transmission bandwidth is divided into 16 subbands.As shown in Figure 4, from an end of maximum transmission bandwidth five equilibrium subband in order.In addition, if the multiple of maximum transmission bandwidth and least part transmission bandwidth is not an integer, then get less than this multiple and near the integer of this multiple for dividing the sum of subband.
When setting candidate's synchronizing channel in each subband, the center frequency range that can select each subband is as candidate's synchronizing channel, and the sub-carrier number I that this candidate's synchronizing channel comprises is not more than the minimum value I of the sub-carrier number that each subband comprises
1
Part bandwidth for transmission system is pre-defined synchronizing sequence when setting candidate's synchronizing channel.If synchronizing sequence length is K, the choosing of K value can be satisfied K and be not more than I, perhaps satisfies 2*K and is not more than I, perhaps satisfies 4*K and is not more than I.Synchronous sequence codes can be selected the good sign indicating number of cross correlation, as PN (Pseudo-randomNoise, pseudorandom) sequence, Golay complementary code (Golay complementary code), CAZAC (ConstantAmplitude Zero Auto-Correction, permanent envelope zero auto-correlation) sequence.For the synchronizing sequence on each subband, can adopt independently sequence, also can produce by the corresponding sequence of a long sequence of intercepting.And can choose synchronizing sequence based on obtaining lower PAPR (Peak to Average Power Rate, peak-to-average power ratio).
402, transmitting terminal is determined one or more candidate's synchronizing channels that do not have narrow band interference from a plurality of candidate's synchronizing channels, transmitting terminal from the described candidate's synchronizing channel that does not have a narrow band interference candidate's synchronizing channel of picked at random as the actual synchronization channel.
In the present embodiment, transmitting terminal and receiving terminal can be respectively base station in the Cellular Networks and the terminal in the Cellular Networks, also can be respectively transmitting node and the receiving nodes in the mesh network (based on wireless mesh network).Transmitting terminal is according to detected narrowband systems signal, from a plurality of candidate's synchronizing channels, determine one or more candidate's synchronizing channels that do not have narrow band interference, promptly do not transmit candidate's synchronizing channel of narrowband systems signal, and therefrom candidate's synchronizing channel of picked at random as the actual synchronization channel.
403, transmitting terminal is in described actual synchronization channel synchronizing signal.
Transmitting terminal is at the predefined synchronizing sequence of described actual synchronization channel.In fact, transmitting terminal to the signal that receiving terminal sends is, the baseband signal that data signals transmitted obtains by the modulation as OFDM (Orthogonal Frequency Division Multiplex, OFDM) on the synchronizing signal of actual synchronization Channel Transmission and other subcarrier.
404, receiving terminal obtains the signal of each candidate's synchronization channel transmissions.
Behind the receiving terminal receiving baseband signal, baseband signal is carried out Filtering Processing, leach the signal of the candidate's synchronization channel transmissions on each subband respectively.At this, the number of filter of receiving terminal configuration is identical with sub-band sum.
405, receiving terminal is determined the actual synchronization channel according to the signal of described candidate's synchronization channel transmissions.
Receiving terminal carries out cross correlation process to the signal that each filter leaches respectively, and the cross-correlation module of carrying out cross correlation process is identical with the number of filter.The method of cross correlation process can be that time-domain signal postpones from mutual method, the local sequence of time domain and time-domain signal received signal cross-correlation method.
406, receiving terminal carries out according to the synchronizing signal of described actual synchronization Channel Transmission synchronously.
Correlation that receiving terminal obtains according to cross-correlation module or the method by CP obtain time synchronized, and carry out Frequency Estimation and compensation according to the signal of actual synchronization Channel Transmission, reach Frequency Synchronization.
In the present embodiment, owing to only utilize one not exist candidate's synchronizing channel of narrow band interference to carry out the transmission of synchronizing signal, therefore, other candidate's synchronizing channel can be used for transmitting data, is used to transmit data thereby save more Radio Resource.The data transmission efficiency of raising system.
The method for synchronous of the wireless transmission that the embodiment of the invention three, four provides, from a plurality of candidate's synchronizing channels, determine one or more candidate's synchronizing channels that do not have narrow band interference by transmitting terminal, from the described candidate's synchronizing channel that does not have a narrow band interference, determine at least one actual synchronization channel, in described actual synchronization channel synchronizing signal, receiving terminal obtains the signal of each candidate's synchronization channel transmissions, and determine the actual synchronization channel according to the signal of described candidate's synchronization channel transmissions, carry out synchronously according to the synchronizing signal of described actual synchronization Channel Transmission.Therefore, when not authorizing frequency range, can use the bandwidth that does not have narrow band interference to carry out the transmission of synchronizing signal flexibly, and not need to consume extra radio spectrum resources, save the limited wireless frequency spectrum resource in part bandwidth for transmission system.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, be to instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
Embodiment five
With embodiment one correspondingly, the embodiment of the invention also provides a kind of synchronizer of wireless transmission, as shown in Figure 5, the synchronizer of embodiment of the invention wireless transmission comprises:
Candidate's synchronizing channel determining unit 501 is used for determining one or more candidate's synchronizing channels that do not have narrow band interference from a plurality of candidate's synchronizing channels;
Actual synchronization channels determining unit 502 is used for determining at least one actual synchronization channel from the described candidate's synchronizing channel of narrow band interference that do not exist;
Synchronizing signal transmission unit 503 is used in described actual synchronization channel synchronizing signal.
In addition, described actual synchronization channels determining unit 502 comprises that synchronizing channel quantity obtains subelement, is used for determining according to the transport service amount quantity of actual synchronization channel.Make transmitting terminal when obtaining the actual synchronization channel, can take all factors into consideration systematic function and net synchronization capability, such as, when can be in the data business volume that transmitting terminal need send big, can choose a spot of candidate's synchronizing channel and carry out the synchronizing signal transmission as the actual synchronization channel, so that more multi-channel resource is used to transmit data, the data business volume that need send at transmitting terminal hour, can choose more candidate's synchronizing channel and carry out the synchronizing signal transmission, thereby obtain better net synchronization capability as the actual synchronization channel.
In addition, described candidate's synchronizing channel determining unit 501 further comprises sub-band division subelement and candidate's synchronizing channel setting subelement.Wherein said sub-band division subelement is used for according to the least part transmission bandwidth maximum transmission bandwidth being divided at least two subbands.Described candidate's synchronizing channel is set subelement, is used for setting candidate's synchronizing signal transmission band as candidate's synchronizing channel at described each subband.
In addition, described sub-band division subelement also further comprises sub-band sum determination module and sub-band division module.Wherein said sub-band sum determination module is used for the sub-band sum of determining that maximum transmission bandwidth is divided.Described sub-band division module, being used for according to described sub-band sum is that maximum transmission bandwidth is divided subband, the bandwidth of described subband all is not less than the least part transmission bandwidth.
The synchronizer of the wireless transmission that the embodiment of the invention five provides, by from a plurality of candidate's synchronizing channels, determining one or more candidate's synchronizing channels that do not have narrow band interference, from the described candidate's synchronizing channel that does not have a narrow band interference, determine at least one actual synchronization channel, and in described actual synchronization channel synchronizing signal, therefore, when frequency range is not authorized by part bandwidth for transmission system, can select not exist candidate's synchronizing channel of narrow band interference to carry out the transmission of synchronizing signal as the actual synchronization channel neatly, avoid producing the narrow band interference of same frequency range, and do not need to consume extra radio spectrum resources, saved the limited wireless frequency spectrum resource.
Embodiment six
With embodiment five correspondingly, the embodiment of the invention provides a kind of synchronizer of wireless transmission, as shown in Figure 6, the synchronizer of embodiment of the invention wireless transmission comprises:
Candidate signal acquiring unit 601 is used to obtain the signal of each candidate's synchronization channel transmissions;
Synchronizing channel determining unit 602 is used for determining the actual synchronization channel according to the signal of described candidate's synchronization channel transmissions;
Synchronous processing unit 603 is used for carrying out synchronously according to the synchronizing signal of described actual synchronization Channel Transmission.
Described candidate signal acquiring unit 601 comprises that signal receives subelement and filtering subelement.Wherein said signal receives subelement, is used for receiving baseband signal.Described filtering subelement is used for baseband signal is carried out Filtering Processing, leaches the signal of each candidate's synchronization channel transmissions.
Described synchronizing channel determining unit 602 comprises the cross-correlation subelement, is used for the signal of described candidate's synchronization channel transmissions is done cross-correlation.Described synchronous processing unit 603 is used for determining the actual synchronization channel according to the cross correlation results of described cross-correlation subelement.
The synchronizer of the wireless transmission that the embodiment of the invention six provides, by obtaining the signal of each candidate's synchronization channel transmissions, determine the actual synchronization channel according to the signal of described candidate's synchronization channel transmissions, carry out synchronously according to the synchronizing signal of described actual synchronization Channel Transmission.Therefore, when not authorizing frequency range, can on candidate's synchronizing channel, receive the synchronizing signal that transmitting terminal sends flexibly, and not need to consume extra radio spectrum resources, save the limited wireless frequency spectrum resource in part bandwidth for transmission system.
Embodiment seven
The invention provides a kind of synchro system of wireless transmission, as shown in Figure 7, the synchro system of embodiment of the invention wireless transmission comprises emitter 701 and receiving system 702;
Wherein said emitter 701, be used for determining one or more candidate's synchronizing channels that do not have narrow band interference from a plurality of candidate's synchronizing channels, from the described candidate's synchronizing channel that does not have a narrow band interference, determine at least one actual synchronization channel, in described actual synchronization channel synchronizing signal;
Described receiving system 702 is used to obtain the signal of each candidate's synchronization channel transmissions, determines the actual synchronization channel according to the signal of described candidate's synchronization channel transmissions, carries out synchronously according to the synchronizing signal of described actual synchronization Channel Transmission.
The synchro system of the wireless transmission that the embodiment of the invention seven provides, from a plurality of candidate's synchronizing channels, determine one or more candidate's synchronizing channels that do not have narrow band interference by emitter, from the described candidate's synchronizing channel that does not have a narrow band interference, determine at least one actual synchronization channel, in described actual synchronization channel synchronizing signal, receiving system obtains the signal of each candidate's synchronization channel transmissions, and determine the actual synchronization channel according to the signal of described candidate's synchronization channel transmissions, carry out synchronously according to the synchronizing signal of described actual synchronization Channel Transmission.Therefore, when not authorizing frequency range, can use the bandwidth that does not have narrow band interference to carry out the transmission of synchronizing signal flexibly, and not need to consume extra radio spectrum resources, save the limited wireless frequency spectrum resource in part bandwidth for transmission system.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (15)
1. the method for synchronous of a wireless transmission is characterized in that, comprising:
From a plurality of candidate's synchronizing channels, determine one or more candidate's synchronizing channels that do not have narrow band interference;
From the described candidate's synchronizing channel that does not have a narrow band interference, determine at least one actual synchronization channel;
In described actual synchronization channel synchronizing signal.
2. the method for synchronous of wireless transmission according to claim 1 is characterized in that, the step of setting described candidate's synchronizing channel comprises:
According to the least part transmission bandwidth maximum transmission bandwidth is divided into a plurality of subbands;
In described each subband, set candidate's synchronizing signal transmission band as candidate's synchronizing channel.
3. the method for synchronous of wireless transmission according to claim 2 is characterized in that, describedly according to the least part transmission bandwidth maximum transmission bandwidth is divided into a plurality of subbands and comprises:
Determine the sub-band sum that maximum transmission bandwidth is divided;
According to described sub-band sum is that maximum transmission bandwidth is divided subband, and the bandwidth of described subband all is not less than the least part transmission bandwidth.
4. the method for synchronous of wireless transmission according to claim 3 is characterized in that, the sub-band sum that described definite maximum transmission bandwidth is divided comprises:
Determine the multiple between maximum transmission bandwidth and least part transmission bandwidth;
As if this multiple is integer, then the sub-band sum that this multiple is divided as maximum transmission bandwidth;
If this multiple be integer, the sub-band sum that will divide as maximum transmission bandwidth less than the integer of maximum in the integer of this multiple then.
5. the method for synchronous of wireless transmission according to claim 3 is characterized in that, described is that maximum transmission bandwidth division subband comprises according to described sub-band sum:
Is that the center symmetry is divided subband according to described sub-band sum with the center frequency point of maximum transmission bandwidth.
6. the method for synchronous of wireless transmission according to claim 3 is characterized in that, described is that maximum transmission bandwidth division subband comprises according to described sub-band sum:
Divide subband according to described sub-band sum in order from an end of described maximum transmission bandwidth.
7. the method for synchronous of wireless transmission according to claim 1 is characterized in that, also comprises:
From the described candidate's synchronizing channel that does not have a narrow band interference, determine at least one synchronized broadcasting channel;
Described synchronized broadcasting channel is by time division multiplexing mode, as actual synchronization Channel Transmission synchronizing signal or as broadcast channel transmission broadcast singal.
8. the synchronizer of a wireless transmission is characterized in that, comprising:
Candidate's synchronizing channel determining unit is used for determining one or more candidate's synchronizing channels that do not have narrow band interference from a plurality of candidate's synchronizing channels;
The actual synchronization channels determining unit is used for determining at least one actual synchronization channel from the described candidate's synchronizing channel of narrow band interference that do not exist;
The synchronizing signal transmission unit is used in described actual synchronization channel synchronizing signal.
9. the synchronizer of wireless transmission according to claim 8 is characterized in that, described actual synchronization channels determining unit comprises:
Synchronizing channel quantity is obtained subelement, is used for determining according to the transport service amount quantity of actual synchronization channel.
10. according to Claim 8 or the synchronizer of 9 described wireless transmission, it is characterized in that described candidate's synchronizing channel determining unit comprises:
The sub-band division subelement is used for according to the least part transmission bandwidth maximum transmission bandwidth being divided into a plurality of subbands;
Candidate's synchronizing channel is set subelement, is used for setting candidate's synchronizing signal transmission band as candidate's synchronizing channel at described each subband.
11. the synchronizer of wireless transmission according to claim 10 is characterized in that, described sub-band division subelement comprises:
The sub-band sum determination module is used for the sub-band sum of determining that maximum transmission bandwidth is divided;
The sub-band division module, being used for according to described sub-band sum is that maximum transmission bandwidth is divided subband, the bandwidth of described subband all is not less than the least part transmission bandwidth.
12. the synchronizer of a wireless transmission is characterized in that, comprising:
The candidate signal acquiring unit is used to obtain the signal of each candidate's synchronization channel transmissions;
The synchronizing channel determining unit is used for determining the actual synchronization channel according to the signal of described candidate's synchronization channel transmissions;
Synchronous processing unit is used for carrying out synchronously according to the synchronizing signal of described actual synchronization Channel Transmission.
13. the synchronizer of wireless transmission according to claim 12 is characterized in that, described candidate signal acquiring unit comprises:
Signal receives subelement, is used for receiving baseband signal;
The filtering subelement is used for baseband signal is carried out Filtering Processing, leaches the signal of each candidate's synchronization channel transmissions.
14. the synchronizer of wireless transmission according to claim 12 is characterized in that, described synchronizing channel determining unit comprises:
The cross-correlation subelement is used for the signal of described candidate's synchronization channel transmissions is carried out cross correlation process;
Described synchronous processing unit is used for determining the actual synchronization channel according to the cross correlation results of described cross-correlation subelement.
15. a wireless transmitting system is characterized in that, comprises emitter and receiving system;
Wherein said emitter, be used for determining one or more candidate's synchronizing channels that do not have narrow band interference from a plurality of candidate's synchronizing channels, from the described candidate's synchronizing channel that does not have a narrow band interference, determine at least one actual synchronization channel, in described actual synchronization channel synchronizing signal;
Described receiving system is used to obtain the signal of each candidate's synchronization channel transmissions, determines the actual synchronization channel according to the signal of described candidate's synchronization channel transmissions, carries out synchronously according to the synchronizing signal of described actual synchronization Channel Transmission.
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| CN200910001155A CN101790231A (en) | 2009-01-23 | 2009-01-23 | Synchronous method, device and system for wireless transmission |
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| CN200910001155A CN101790231A (en) | 2009-01-23 | 2009-01-23 | Synchronous method, device and system for wireless transmission |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013033907A1 (en) * | 2011-09-09 | 2013-03-14 | Renesas Mobile Corporation | Methods and apparatus for inter-cell interference coordination |
| CN105553631A (en) * | 2012-03-23 | 2016-05-04 | 广东新岸线计算机系统芯片有限公司 | OFDM (Orthogonal Frequency Division Multiplexing)-based data transmission method, transmitting sites and receiving site |
| CN106716947A (en) * | 2014-03-07 | 2017-05-24 | 华为技术有限公司 | Common broadcast channel low PAPR signaling in massive MIMO systems |
| CN108632908A (en) * | 2017-03-24 | 2018-10-09 | 展讯通信（上海）有限公司 | A kind of fractional bandwidth radio transmitting method, device, base station and user equipment |
| CN110691052A (en) * | 2018-07-06 | 2020-01-14 | 扬智科技股份有限公司 | Symbol synchronization method and signal receiving circuit |
| CN114726700A (en) * | 2022-04-22 | 2022-07-08 | 哈尔滨工业大学 | Interference scene-oriented multi-carrier communication system self-adaptive anti-interference synchronization method |
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2009
- 2009-01-23 CN CN200910001155A patent/CN101790231A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013033907A1 (en) * | 2011-09-09 | 2013-03-14 | Renesas Mobile Corporation | Methods and apparatus for inter-cell interference coordination |
| CN105553631A (en) * | 2012-03-23 | 2016-05-04 | 广东新岸线计算机系统芯片有限公司 | OFDM (Orthogonal Frequency Division Multiplexing)-based data transmission method, transmitting sites and receiving site |
| CN105553631B (en) * | 2012-03-23 | 2018-09-21 | 广东新岸线计算机系统芯片有限公司 | A kind of data transmission method, transmitting website and receiving station based on OFDM |
| CN106716947A (en) * | 2014-03-07 | 2017-05-24 | 华为技术有限公司 | Common broadcast channel low PAPR signaling in massive MIMO systems |
| CN106716947B (en) * | 2014-03-07 | 2020-04-28 | 华为技术有限公司 | Method for transmitting wide-beam signal to UE and MIMO transmitter |
| CN108632908A (en) * | 2017-03-24 | 2018-10-09 | 展讯通信（上海）有限公司 | A kind of fractional bandwidth radio transmitting method, device, base station and user equipment |
| CN108632908B (en) * | 2017-03-24 | 2021-10-26 | 展讯通信（上海）有限公司 | Partial bandwidth wireless transmission method, device, base station and user equipment |
| CN110691052A (en) * | 2018-07-06 | 2020-01-14 | 扬智科技股份有限公司 | Symbol synchronization method and signal receiving circuit |
| CN110691052B (en) * | 2018-07-06 | 2021-11-23 | 扬智科技股份有限公司 | Symbol synchronization method and signal receiving circuit |
| CN114726700A (en) * | 2022-04-22 | 2022-07-08 | 哈尔滨工业大学 | Interference scene-oriented multi-carrier communication system self-adaptive anti-interference synchronization method |
| CN114726700B (en) * | 2022-04-22 | 2024-02-06 | 哈尔滨工业大学 | Self-adaptive anti-interference synchronization method of multi-carrier communication system facing interference scene |
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