CN102325116A - Synchronization method and system in communication system - Google Patents
Synchronization method and system in communication system Download PDFInfo
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- CN102325116A CN102325116A CN201110200865A CN201110200865A CN102325116A CN 102325116 A CN102325116 A CN 102325116A CN 201110200865 A CN201110200865 A CN 201110200865A CN 201110200865 A CN201110200865 A CN 201110200865A CN 102325116 A CN102325116 A CN 102325116A
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Abstract
The invention relates to a first transceiver and second transceiver uplink synchronization method in a multi-user cellular communication system. Communication resources are divided into communication channels. The method comprises the steps of: receiving a first signature sequence, wherein the first signature sequence is transmitted to a first transceiver by a second transceiver, the signature sequence is selected from a first group of signature sequences and at least part of the first signature sequence is selected from a group of zero correlation zone sequences; and in the first transceiver, correlating the received signal with at least one signature sequence selected from a second group of signature sequences to estimate the arrival time of a signature signal, so as to synchronize transmission between the second transceiver and the first transceiver.
Description
Technical field
The present invention relates to field of wireless communications systems, relate in particular to the uplink synchronisation method of base station and portable terminal in a kind of multi-user's cellular communication system.
Background technology
In current GSM, to base station and portable terminal specific (special) requirements arranged synchronously, purpose is proper data to be transmitted be guaranteed.The example of this type systematic is that universal terrestrial radio inserts (UTRA) and evolution UTRA.
In evolution UTRA, single-carrier frequency division multiple access (SC-FDMA) can be used as the multiple access scheme that uplink communication provides.The transmission plan of SC-FDMA is so-called DFT-spread orthogonal frequency domain multiplexing (DFT-expands OFDM), and it can be counted as the OFDM of band precoding.Have high peaks to mean value ratio (PAPR) although produce the OFDM of multi-carrier signal, the DFT precoding provides the lower single-carrier signal of PAPR.Lower PAPR can be used to extended coverage range and the consumption that reduces battery in the mobile device.
In DFT expansion OFDM, Cyclic Prefix is used for obtaining the balance of frequency domain.But synchronous like this to the signal that DFT expands among the OFDM and the requirement of successful balance is all portable terminals transmissions from the sub-district among the OFDM: the delay of signals expansion adds the duration of the temporal delay of arrival less than Cyclic Prefix.Therefore, each portable terminal that sends can send in the part of the duration that need be synchronized to Cyclic Prefix before the data at it.
In evolution UTRA, carry out at uplink downlink synchronously.A step synchronous is in the down-going synchronous, and portable terminal regularly carries out synchronization (or locking) to the frame of carrier frequency and base station.But this synchronization is not enough to guarantee that the base station can be from the signal of suitable acceptance from portable terminal, because the distance of portable terminal and base station can be different.
Therefore, needing further synchronization is uplink synchronous, thereby because the distance between base station and the portable terminal is unknown usually two-way time.
In evolution UTRA, RACH (RACH) is supported the uplink synchronous of portable terminal.Based on contention (contention-based), promptly any portable terminal can send by the resource of distributing to RACH in the sub-district among the evolution UTRA.Therefore, some portable terminals can manage to send simultaneously synchronizing signal, and, can not distinguish danger in order to reduce the base station from the signal of different mobile terminal, be provided with one group of signature sequence, wherein each portable terminal is selected a signature sequence randomly.
The binary pseudo-random sequence that shift register generates in UTRA and evolution UTRA is modulated so that produce these signature sequences by 16 bit hadamard sequences.Even these signature sequences provide good correlation in many cases, still need the enhancing detection ability in case have examine under the situation that especially sir value is lower of signing simultaneously particular signature.
Summary of the invention
The purpose of this invention is to provide uplink synchronisation method and system in a kind of multi-user's cellular communication system, it has strengthened the ability that detects single signature under several situation that especially sir value is lower of signing simultaneously having.
According to the present invention; Signature sequence sends to first transceiver from second transceiver; Wherein said first signature sequence is selected from first group of signature sequence; And wherein make in received signal and first transceiver at least one signature sequence relevant, thereby so that estimation make the transmitting synchronous between second transceiver and first transceiver time of advent.The present invention is characterized in that signature sequence at least partly comprises zero-correlation zone sequence.Said signature sequence can be selected from one group of signature sequence.
Its advantage is; Except for example making, the good characteristic that keeps the prior art signature sequence differently becomes possible good autocorrelation and the less peak-to-average power ratio with the accurate timing estimation of the synchronous signature sequence of part simultaneously; Also obtain zero or substantially zero cross-correlation synchronous and the while signature sequence, can be easy to distinguish each other the detectability that significantly improves specific signature sequence because of these sequences.Detectability improves other tool advantage: the signature sequence that sends at the same time is more than under one the situation, and omission is required, and to transmit this number more less, so system resource obtains more effective use.In addition, the quick access that more and more importantly obtains network with can use the high energy FastData.Improve the specific portable terminal that detectability makes it possible to detect quickly data to be sent, help interoperability equally with the IP agreement.
Adopt signature sequence further to have advantage according to the present invention: though the signal level of a signature sequence more by force and substantially simultaneously signature sequence signal level significantly a little less than; For example owing to distance, shielding or (possibility is maximum) decline fast, the correct probability that detects also significantly improves.
The length of the zero correlation block of said first signature sequence makes it roughly corresponding to the maximum expected delay of transmitting from second transceiver to first transceiver.In addition, received signal can be relevant with at least one signature sequence to be used for the signal delay of predetermined quantity, for example is used for maximum expected delay.Postponing the available cell size confirms.Its advantage is to obtain the ideal length of zero correlation block, and number of signature sequences can be different so that required zero correlation section length is provided thus.Sequence is many more, and zero correlation block is just short more.
Can one group of matched filter be used for first transceiver makes received signal relevant to be used for the signal delay of predetermined quantity with at least one signature sequence or each signature sequence of one group of signature sequence; Detect the peak value output of each matched filter simultaneously; Examine thereafter the output of each filter peak being used to estimate the time of advent, so that make the transmission of carrying out from second transceiver synchronous.Its advantage is relevant can carrying out simply.
One group of Generalized C hirp shape sequence that the orthogonal set modulation Zadoff-Chu sequence of the desirable personal complex sequences of signature sequence obtains.For example, the orthogonal set of modulation sequence is row and/or the collection of row in hadamard (Hadamard) matrix.Its advantage is that signature sequence can simply accomplish.
Description of drawings
Fig. 1 illustrates the basic DFT expansion OFDM transmitter architecture that is used for synchronous data transmission.
Fig. 2 illustrates the auto-correlation of the exemplary signature sequence of the present invention and the absolute value of cross-correlation function.
Fig. 3 is shown specifically the part of figure among Fig. 2.
Fig. 4 illustrates false dismissal probability that sends sequence of the present invention.
Fig. 5 illustrates the present invention and sends the false dismissal probability of the previous transmission sequence of sequence face one or more other.
Embodiment
The existing communication system that adopts DFT to expand OFDM to the present invention details.
The expansion of DFT shown in Fig. 1 OFDM uses basic transmitter architecture.Each piece M complex modulation symbol x
n, n=0,1 ..., M-1 is by causing M coefficient X
kThe DFT conversion:
The output of DFT is mapped to equidistance subcarrier l
k=l
0+ kL is last, wherein l
0Be frequency shift (FS), L is the integer more than or equal to 1.Every other input to the anti-DFT of N point (IDFT) is by zero setting.
The output y of IDFT
nProvide by following formula:
At last,, insert Cyclic Prefix, that is, before same-sign begins, insert the copy at each OFDM symbol rear portion for fear of intersymbol interference (ISI) and interchannel interference (ICI).Time window can be used for launching (out-of-band emission) outward so that reduce frequency band after the Cyclic Prefix.
Cyclic Prefix makes that balance becomes possibility in the frequency domain.But synchronous like this to the signal that DFT expands among the OFDM and the requirement of successful balance is all portable terminals transmissions from the sub-district among the OFDM: the delay of signals expansion adds the duration of the temporal delay of arrival less than Cyclic Prefix.Therefore, portable terminal can send in the part of the duration that need be synchronized to Cyclic Prefix before the data at it.
As stated, in first synchronizing step, the carrier frequency of portable terminal use base station and frame are regularly so that carry out synchronously in DFT expansion ofdm system.Though this synchronizing step guarantees the down-going synchronous mobile device and can receive from signal of base station, thereby needs further synchronously so that unknown usually portable terminal and the base station distance of compensation guarantees that the base station can suitably receive the signal from portable terminal.Away from the portable terminal of base station receive downstream signal its postpone can be greater than the portable terminal near the base station, up link send signal propagate into this portable terminal the base station time with compare and will grow from signal near the portable terminal of base station.In case the base station estimated from the time of the signal arrival base station that portable terminal sends, the base station can send to portable terminal with order and regularly make from the desirable time point arrival of being transmitted in of different mobile terminal base station so that adjust its transmission.
The importance of second synchronizing step is that portable terminal has made the reception of downstream signal synchronous, is also to arrive that to send temporal all changes of base station of signal from portable terminal all poor owing to two-way time.Because cell size is known, the time of advent, scope was considered to priori in the base station.
In evolution UTRA, RACH in the up link (RACH) is supported the uplink synchronous of portable terminal.It is mapped to the regular hour (access slot) and frequency resource.Should there be a protection that all transmission signals are arrived in the distribution time and not interfering data transmission at each access slot, no matter where the portable terminal that sends is arranged in the sub-district.Because RACH is based on contention among the evolution UTRA, that is, any portable terminal can send with the time-frequency resources of distributing to RACH in the sub-district, and an above portable terminal can simultaneously or attempt to send synchronizing signal substantially simultaneously.Can not distinguish the danger from the signal of different mobile terminal in order to reduce the base station, be provided with one group of signature sequence, wherein each portable terminal is often selected a signature sequence randomly from one group of signature sequence.
Owing to successfully examine to such an extent that signature sequence is necessary to connection of mobile terminal into network, thus therefore importantly the signal transmitted sequence need hang down the power amplifier compensation and create conditions so that cover for high average transmit power is good.
Signature sequence should have following attribute in the up link:
Good autocorrelation, so that for the accurate timing estimation creates conditions,
Good cross correlation, so that create conditions with the accurate timing estimation of synchronous (the being down-going synchronous) signature sequence of part simultaneously for different, wherein phase difference was limit by the maximum round trip time in the sub-district.
Synchronously with the zero cross-correlation of signature sequence simultaneously, and
Little peak-to-average power ratio.
These signatures make among the used now UTRA RACH signature be met to a great extent, and these also constitute the current suggestion that provides for evolution UTRA.In UTRA, the binary pseudo-random sequence that shift register generates is modulated so that produce signature sequence by 16 bit hadamard sequences.In addition, the rotation of signal clump is used to reduce the PAPR of signal.
Being modulated in the receiver complexity with hadamard sequences reduces and creates conditions.To each delay, it is multiplexing that received signal carries out unit level (element-wise) with pseudorandom conjugation scramble sequence.All the 16th samples produce 16 yuan of vectors mutually.At last, make hadamard sequences with institute's reception vector correlation so that produce the relevant output of signature sequence.
But the detection probability of the single signature of some attribute of these known signature sequences in face of for example other are signed simultaneously one or one maybe be better, and is particularly like this when sir value is low.
According to the present invention, above problem adopts zero-correlation zone sequence to overcome, that is, the down-going synchronous portable terminal sends signal, and it is a signature sequence of taking from one group of zero-correlation zone sequence.
One group length is the M sequence { d of N
x(k) }, x=0,1 ..., M-1, k=0,1 .., N-1, being said to be is one group of zero-correlation zone sequence, if all sequences satisfies following auto-correlation and cross correlation properties in this group:
Periodic autocorrelation function <img file = "BDA0000076604390000061.GIF" he = "75" img-content = "drawing" img-format = "tif" inline = "yes" orientation = "portrait" wi = " 601 " /> for 0 <| p | ≤ T p is zero and all periodic cross-correlation function <img file =" BDA0000076604390000062.GIF " he =" 72 " img-content =" drawing " img-format = "tif" inline = "yes" orientation = "portrait" wi = "581" /> for | p | ≤ T for all p (including p = 0) is zero.T is the length in auto-correlation district.
In example embodiment of the present invention, this group zero-correlation zone sequence constitutes with Generalized C hirp shape (GCL) sequence.GCL sequence { c (k) } is defined as
c(k)＝a(k)b(k?mod?m)，k＝0，1，...，N-1.(3)
N=sm wherein
2, s and m are positive integer, and { b (k) } is any sequence of m multiple unit value number, and { a (k) } is the Zadoff-Chu sequence:
W wherein
N=exp (j2 π r/N) and r and N relatively prime (that is, the greatest common factor (G.C.F.) of r and N equals 1).
Any GCL sequence has the ideal period correlation function, that is, it is constant amplitude zero auto-correlation (CAZAC) sequence.
If two GCL sequence c
x(k) and c
y(k) with identical Zadoff-Chu sequence { a (k) } but different any modulation sequence { b
xAnd { b (k) }
y(k) } definition, what can obtain showing be (promptly to be similar to by this way, disclosed content: B.M.Popovic in the following paper; " New Complex Space-Time Block Codes for Efficient Transmit Diversity; " IEEE 6th Int.Symp.on Spread-Spectrum Tech.& Appl (ISSSTA 2000)., NJ, USA; Pp.132-136, in September, 2000) periodic cross-correlation is zero to all the time shift p in the following delay zone
0＜|p|＜sm，sm＜|p|＜2sm，...，(m-1)sm，＜|p|＜sm
2。
Thereby, if above two modulation sequence quadratures are obtained not only quadrature of GCL sequence, and have the zero correlation block that length is sm-1.
Based on this attribute, m zero-correlation zone sequence of this group can be defined as this group GCL sequence, and way is with m different orthogonal modulation sequence { b
i(k) }, i=0,1,2 ..., m-1, k=0,1,2 ..., m-1 modulates public Zadoff-Chu sequence.Periodic cross-correlation between any two sequences taking from this group is right-sm and+all delays between the sm will be zero.
The sequence of taking from this group zero-correlation zone sequence is used for synchronization signatures.Though the matched filter of this type signature in fact to aperiodic cross-correlation calculate, estimate that the ideal period cross correlation in the search window will be reserved to a great extent.This is because to the delay in the search window of sequence length, to aperiodic with the periodic cross-correlation value and only different on few items.This is expected to be numerical computations and confirms.
To the GCL sequence, the possible option of selecting the quadrature modulation sequence will be the group of hadamard sequences or DFT (DFT) sequence for example.The group of DFT sequence is defined as
And the group of hadamard sequences is defined as row in the mxm hadamard matrix (or row or might ranks the two), and it defines as follows: m rank hadamard matrix Hm only forms by 1 and-1 and has an attribute HmHm
T=mI, wherein I is a unit matrix and T representes transposition.Therefore, hadamard sequences quadrature.To m=2
n, wherein n is a positive integer, hadamard sequences can be defined as
I wherein
l, k
lBit for m the bit long binary representation of integer i and k.
Real number m and N can select so that adapt to the requirement of evolution UTRA.To the sequence of given length, just need and can provide number of signature to take all factors into consideration like this to zero correlation section length.
For example to bandwidth among the evolution UTRA of 1.25MHz, the typical time that can be used for signature sequence transmission is 500 μ s, and guard time is about 110 μ s, and the duration of sequence then is 390 μ s.Suppose that sampling rate is for example 1.024MHz, then sequence length is N=400=sm
2
Cell size is known usually, thus in the sub-district two portable terminals to send maximum time difference between the signal (that is, send to the portable terminal that is associated with another terminal from additional propagation time sum) as the same.Helpful is, makes adaptive this time difference of zero correlation section length, and promptly purpose is that the institute that obtains below the most-likely time difference might the low of time difference be correlated with.If for example cell size is 14km, the maximum traveling time of signal is corresponding to 96 symbols under the situation of above-mentioned supposition.Low cross-correlation in this delay scope will be guaranteed as stated, therefore if sm=100 just has m=4, and s=25 (bigger m maybe with causing short bad thus zero correlation section length).For for simplicity, select q=0 in the equation (4).But must know available other q values.Null value q can cause in the sequence and be shifted.Therefore, 4 length being arranged is 400 different signature sequences.
The auto-correlation of the sequence of the received signal of band shown in Fig. 2 and the absolute value of cross-correlation function.
To DFT modulation GCL sequence; N=400 (s=25; M=4); R=1, the amplitude of asymmetric cross-correlation function
wherein p are shown in Fig. 2 for delay " * " expression complex conjugate.
One group of hadamard-modulated GCL sequence has such auto-correlation and cross-correlation function, and they are similar to the function shown in Fig. 2.The peak value of cross-correlation is near the multiple of sm=100.This peak value is showed certain widening, and promptly the correlation near the multiple of sm has no small nonzero value, and periodic cross-correlation function this point is not existed.But,, postpone to be less than 96 o'clock cross-correlation functions and be no more than 20 given parameter.Therefore, be the sub-district of 14km to size, the line chart only part below the p=96 is significant, and is clear and definite at a distance from interior relevant result during this time.This part is illustrated in greater detail in Fig. 3 with line chart among Fig. 2 that delay 0-100 is shown.
Actual synchronization is carried out by the base station like this: adopt one group of matched filter to make received signal with relevant as far as the signature sequence in this group signature sequence of all delays in the search window, and detect the peak value output of each matched filter.Certain threshold value is used to reduce the probability of flase drop, that is, this threshold value is set as certain value and makes that it causes such detection when received signal only is made up of noise, and its power is certain, is 0.0001.
Each filter peak output of examining then is used to estimate the time of advent, promptly postpones, so that make the transmitting synchronous of carrying out from portable terminal.
Comparison signal can be nonperiodic signal in the base station, promptly only comprises one-period.This signal also can be periodic signal or comprises that one-period adds the part in certain cycle of every side or both sides.As use periodic signal, must strengthen threshold value, because probability of false detection increases.On the other hand, when an above signature sequence, robustness is improved.The part in additional certain cycle of one or both sides of the signature sequence that might send at portable terminal certainly in addition.The length of extention can be confirmed by the time that can be used for sending signature sequence.
In one embodiment of the invention, all sub-districts have the signature sequence of equal number in the system, and preferably this quantity is selected based on largest cell in the system.But clearly, specific signature sequence can be different because of the sub-district.This has the following advantages: when portable terminal appeared on the border of two sub-districts, confirmable was that which sub-district it attempts to get in touch.If neighbor cell has signature sequence on the same group, the calling from portable terminal can be attempted replying in two or more base stations.On the other hand, confirmable is that which base station provides best signal quality and which base station to reply.But by the above also clearly, also might have not signature sequence on the same group in the different districts.Signature sequence is not difficult to obtain through changing r on the same group.Which r value will be with sending it to portable terminal, and can produce by above equation thus should the group signature sequence.In addition, if the sub-district is less, number of signature can increase with reservation queue length.If for example cell size is 7km, required delay number of steps is merely the half the of example.Therefore, m can be made as 7 and s is made as 8.This will cause a length is signature sequence and 7 signature sequences of 392, and it satisfies cell size, i.e. requirement during sm-1=55 step.In this example, above guard time obtains keeping.But also possible is in less sub-district, to reduce guard time, thereby makes longer signature sequence make that also bigger sequence number becomes possibility thus.
These proposed signature sequences or leading detection performance are assessed by the link level simulation.Intercepting WCDMA RACH leading with length be the hadamard matrix of 4 bits but not 16 bits together as reference, with regard to the sequence of being advised, purpose is the signature sequence that keeps equal number.The reception antenna number is two, is derived from two relevant loosely combinations that postpone same antenna, promptly adds the absolute value of square matched filter output that postpones two identical antennas.The tentative calculation number is 100000.
Two scenes are simulated.Checkout gear makes in received signal and the search window all possible signature sequence relevant in two scenes.Certain threshold value is provided with provides 0.0001, i.e. false alarm probability (false alarm probability) to postponing single signature sequence.If the signature sequence that sends is not examined, just declare omission.
In first scene, have only a leading time-frequency resources to send by RACH.Be distributed in the search window delay random, that is, in this example, be in 0 to 96 sample, in its scope corresponding to the mobile device of random distribution in the sub-district.
In second scene, two or more different signature sequences of taking from the same group send by identical time-frequency resources.The SNR of signature S1 fixes (SNR=-15dB), and other disturb signature to send with various power excursions and lead signature 1.But all disturb signature to send with equal-wattage.Institute bears the signature all in search window with the independent random delayed delivery.Than the false dismissal probability of weak signal signature S1 by record.SIR is the power and the ratio that disturbs the power of any one signature in the signature of signature S1.
Analog result to scene 1 and 2 is shown in Figure 4 and 5 respectively.False dismissal probability that sends sequence shown in Fig. 4, Fig. 5 are illustrated in another and send the sequence false dismissal probability of certain transmission sequence in front.Can know compared with prior art by Fig. 4, not having under the situation of interference sequence, as broad as long on false dismissal probability.Therefore, in the case, the performance of signature sequence of the present invention is the same with the prior art sequence good.
But about there being two or more simultaneously or second scene of the sequence of sending simultaneously substantially, result shown in Figure 5 clearlys show the detection performance that should organize sequence its remarkable improvement in face of or several interference sequences to the present invention.To the sequence set of being advised, detect performance and do not become with the interference that increases quantity, in addition also constant as far as low-down sir value, and to canonical sequence, because of the increase of interference number and along with SIR reduces, performance all significantly reduces.This not little difference can be explained by such condition at least in part: when strong signal and weak signal existed simultaneously, the strong signal of part can be counted as the part weak signal in correlated process, cause miscalculation to postpone.The advantage of the use of signature sequence of the present invention is, and is visible in Fig. 5, even the signal level of a signature sequence is very strong when simultaneously the signal level of signature sequence substantially is significantly more weak, the correct probability that detects also significantly improves.
The lower false dismissal probability that the sequence set of being advised is shown is owing to the good cross correlation of zero-correlation zone sequence; Therefore the present invention compared with prior art has remarkable improvement; Adopt zero-correlation zone sequence can make it possible to reduce the leading transmitted power of RACH simultaneously to the improvement of detection probability; Reduce thus always to disturb extending battery life in the system.
In addition, the present invention has been described to utilize whole zero-correlation zone sequence in the above.Therefore might adopt the intercepting sequence, that is, be not to adopt whole zero-correlation zone sequence.This will reduce detection probability, but have such advantage: the degree of freedom on the number of signature sequences of selecting particular signature length increases.Blocking can be different because of cell size, keeps blocking more greatly of superperformance to accept in the less sub-district.
As stated, the present invention has some advantages.Need take in other characteristics that make the appropriate operation of system but exist.For example, as stated, thereby importantly the signature sequence that sends need hang down power amplifier and compensates for high average transmitting power and create conditions for good covering.The two kind tolerance (method) relevant with power back-off are peak-to-average power ratio (PAPR) and cubic metric (CM).
Below, intend and describe the influence of the present invention these tolerance (method).
Make that z (t) is the normalized basis band signal, thereby its desired value E (| z (t) |
2)=1.The 99.9th the PAPR value of the being defined as x that belongs to hundredths, its 10log
10(| z (t) |
2The probability of)＜x equals 0.999.
CM is defined as:
CM＝[20log
10((v_norm
3)
rms)-20log
10((v_norm_ref
3)
rms)]/1.85 (7)
Wherein:
V_norm is the regular voltage waveform of input signal;
V_norm_ref is that the regular voltage waveform of contrast signal is (in the WCDMA AMR speech, 12.2kbps)
Table 1 is enumerated the 99.9th PAPR value of such genus hundredths, and it is directed against leading by the reference WCDMA of 400 samples RACH with 4 bit hadamard modulation sequences, and to the GCL sequence that relates to DFT and hadamard-modulated sequence.Table 2 is enumerated corresponding CM value.
Table 1 belongs to the 99.9th PAPR value of hundredths
Fig. 2 cubic metric value
Maximum in all cases PAPR value spreads all over all modulation sequences and provides.The number range that provides for WCDMARACH is leading spreads all over all scrambled encoded.To the GCL sequence, used the Zadoff-Chu sequence of r=1.This specific examples of notice r value is merely an example.Used two kinds of different pulse shaping filters, single sinusoidal filter and roll-off factor are 0.15 root raised cosine filter.
Can know that by table the PAPR of DFT modulation sequence and cubic metric all are lower than hadamard-modulated GCL sequence.In addition, use cubic metric or the PAPR that root raised cosine does not improve the DFT modulation sequence.
At last, the PAPR of DFT modulation GCL sequence is the same good with the situation of the WCDMA sequence of band root raised cosine filter, and cubic metric then slightly is superior to the situation of WCDMA sequence.Obviously, might obtain to what low power compensation created conditions and respectively organize zero-correlation zone sequence.
Claims (33)
1. first transceiver and second transceiver uplink synchronisation method in multi-user's cellular communication system, wherein the communication resource is divided into communication channel, it is characterized in that, and the method comprising the steps of:
Receive first signature sequence; Wherein said first signature sequence sends to first transceiver by second transceiver; Wherein said first signature sequence is selected from first group of signature sequence, and the formation of said first signature sequence is at least partly taken from the sequence of one group of zero-correlation zone sequence;
And in first transceiver, received signal is relevant with the signature sequence that at least one is selected from second group of signature sequence, thereby so that estimate the transmitting synchronous that makes the time of advent of said signature sequence between second transceiver and first transceiver.
2. the method for claim 1, it is relevant to be used for the signal delay of predetermined quantity wherein to make received signal and at least one be selected from the signature sequence of second group of signature sequence.
3. according to claim 1 or claim 2 method, the length of the zero correlation block of wherein said first signature sequence makes it corresponding to the maximum expected delay of second transceiver to the transmission of first transceiver.
4. like claim 2 or 3 described methods, wherein cell size is used for confirming the maximum delay of said correlation step and/or the maximum expected delay that second transceiver transmits to first transceiver.
5. like each described method among the claim 1-42, wherein said correlation step further comprises step:
It is relevant being used for the signal delay of predetermined quantity to use one group of matched filter in first transceiver to make that received signal and at least one are selected from the signature sequence of second group of signature sequence,
Detect the peak value output of each matched filter, and
Use the peak value output estimation time of advent of detected each matched filter, so that make transmitting synchronous from second transceiver.
6. like each described method among the claim 1-5; It is characterized in that, wherein make received signal and at least one be selected from that the signature sequence of second group of signature sequence is relevant to be: make the relevant delay of each signature sequence in received signal and the said second group of signature sequence with the predetermined quantity that is used for received signal.
7. each described method as in the previous claim is characterized in that, each signature sequence in first group of signature sequence is taken from one group of Generalized C hirp shape sequence with the orthogonal set modulation Zadoff-Chu sequence acquisition of complex sequences.
8. method as claimed in claim 7 is characterized in that, the said orthogonal set that is used to modulate the Zadoff-Chu sequence is the row of DFT matrix and/or the collection of row.
9. method as claimed in claim 7 is characterized in that, the said orthogonal set that is used for modulating the Zadoff-Chu sequence is the collection of the capable and/or row of hadamard matrix.
10. like each described method in the previous claim, it is characterized in that said first signature sequence is selected at random from said first group of signature sequence.
11., it is characterized in that said multi-user's cellular communication system is UTRA or evolution UTRA system like each described method in the previous claim.
12. like each described method in the previous claim, it is characterized in that said first transceiver is the base station, said second transceiver is a portable terminal.
13., it is characterized in that said first group of signature sequence and second group of signature sequence constitute signature sequence on the same group like each described method in the previous claim.
14., will represent that wherein the reference of concrete signature sequence group sends to second transceiver, and second transceiver uses said reference to obtain signature sequence prescription case for use like each described method in the previous claim.
15., it is characterized in that said first signature sequence constitutes the intercepting sequence of taking from one group of zero-correlation zone sequence like each described method in the previous claim.
16. like each described method in the previous claim, wherein before the transmitting synchronous step between said second transceiver and first transceiver, said second transceiver is carried out the down-going synchronous with said first transceiver.
17. a device is used for first transceiver and the second transceiver uplink synchronisation method of multi-user's cellular communication system, wherein the communication resource is divided into communication channel, it is characterized in that, said device comprises:
Be used to receive the unit of first signature sequence; Wherein said first signature sequence sends to first transceiver by second transceiver; Wherein said first signature sequence is selected from first group of signature sequence, and the formation of said first signature sequence is at least partly taken from the sequence of one group of zero-correlation zone sequence;
And be used at first transceiver, received signal is selected from the relevant unit of signature sequence of second group of signature sequence with at least one, thereby so that estimates the transmitting synchronous that makes the time of advent of said signature sequence between second transceiver and first transceiver.
18. multi-user's cellular communication system, wherein the communication resource is divided into communication channel, it is characterized in that, this system comprises the device of carrying out following steps:
First signature sequence that reception is sent from second transceiver, the signature sequence that is wherein sent is selected from first group of signature sequence, and said first signature sequence is configured to, and makes its formation at least partly take from the sequence of one group of zero-correlation zone sequence; And the device of carrying out following steps:
It is relevant to make received signal and at least one be selected from the signature sequence of second group of signature sequence, thereby makes the transmitting synchronous of second transceiver to first transceiver time of advent of said signature sequence so that estimate.
19. system as claimed in claim 18 is characterized in that, the said device that is used for being correlated with further comprises the relevant device with the signal delay that is used for predetermined quantity of at least one signature sequence that makes received signal and said second group of signature sequence.
20. like claim 18 or 19 described systems, the length that the zero correlation block of wherein said first signature sequence is configured to have makes it corresponding to the maximum expected delay of second transceiver to the transmission of first transceiver.
21., it is characterized in that cell size is used for confirming the maximum delay of said correlation step and/or the maximum expected delay that second transceiver transmits to first transceiver like claim 19 or 20 described systems.
22. like each described system among the claim 18-21, the wherein said device that is used to be correlated with further comprises the device of carrying out following steps:
It is relevant to be used for the signal delay of predetermined quantity to use one group of matched filter in first transceiver to make that received signal and at least one are selected from the signature sequence of second group of signature sequence;
Detect the peak value output of each matched filter; And
Use the peak value of each detected matched filter to export and estimate the time of advent, so that make transmitting synchronous from second transceiver.
23. like each described system among the claim 18-22; It is characterized in that the said device that is used for being correlated with further comprises the relevant device that postpones with the predetermined quantity that is used for received signal of each signature sequence that makes received signal and said second group of signature sequence.
24., it is characterized in that each signature sequence in first group of signature sequence is taken from one group of Generalized C hirp shape sequence that obtains with the orthogonal set modulation Zadoff-Chu sequence of complex sequences like each described system among the claim 18-23.
25. system as claimed in claim 24 is characterized in that, the said orthogonal set that is used to modulate the Zadoff-Chu sequence is the row of DFT matrix and/or the collection of row.
26. system as claimed in claim 24 is characterized in that, the said orthogonal set that is used for modulating the Zadoff-Chu sequence is the collection of the capable and/or row of hadamard matrix.
27., it is characterized in that said first signature sequence is configured to from said first group of signature sequence, select at random like each described system among the claim 18-26.
28., it is characterized in that said multi-user's cellular communication system is UTRA or evolution UTRA system like each described system among the claim 18-27.
29., it is characterized in that said second transceiver is a portable terminal like each described system among the claim 18-28.
30., it is characterized in that said first group of signature sequence and second group of signature sequence constitute signature sequence on the same group like each described system among the claim 18-29.
31. like each described system among the claim 18-30; Wherein said system comprises the device that is used for the reference of the concrete signature sequence group of expression is sent to second transceiver, and second transceiver uses said reference to obtain signature sequence prescription case for use.
32. transmitter that is used for multi-user's cellular communication system; It is characterized in that; This transmitter comprises the device that is used for first signature sequence is sent to receiver, and wherein said first signature sequence is selected from first group of signature sequence, and said first signature sequence is taken from one group of zero-correlation zone sequence.
33. multi-user's cellular communication system; It has the communication resource of between at least the first transceiver and second transceiver, communicating by letter; It is characterized in that said communication system comprises that enforcement of rights requires first transceiver and second transceiver of each said method among the 1-16.
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| US10009928B2 (en) | 2006-01-18 | 2018-06-26 | Huawei Technologies Co., Ltd. | Method, apparatus and system for random access |
| US10779330B2 (en) | 2006-01-18 | 2020-09-15 | Huawei Technologies Co., Ltd. | Method, apparatus and system for random access |
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