CN105122751A

CN105122751A - Method and apparatus for sending signal used for synchronization

Info

Publication number: CN105122751A
Application number: CN201480000855.2A
Authority: CN
Inventors: 黎超
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2014-03-19
Filing date: 2014-03-19
Publication date: 2015-12-02
Anticipated expiration: 2034-03-19
Also published as: CN105122751B; WO2015139249A1

Abstract

A method for sending a signal used for synchronization, comprising: using a sequence b(n) to generate a sequence d(n) used for synchronizing a signal; mapping the sequence d(n) to a corresponding resource position to generate a synchronous baseband signal s; and sending the baseband signal s out after performing radio frequency processing thereon, wherein the length of the sequence d(n) used for synchronizing the signal is not less than that of the sequence b(n). Further disclosed is an apparatus for sending a signal used for synchronization. By way of using the embodiments of the present invention, the communication performance of a D2D communication system can be effectively improved.

Description

Method and apparatus for sending signal used for synchronization

It is a kind of to be used for synchronous signaling method and device

Technical field is more particularly to a kind of to be used for synchronous signaling method and device the present invention relates to communication technical field.Background technology is synchronously the key technology of communication system, especially wireless communication system.Can receiver efficiently be synchronized to emitter, by the performance of strong influence practical communication system.

At present, 3GPP (The 3rd Generation Partnership Project, third generation partner program）Realizing a kind of entitled D2D (Device to Device device-to-devices）Communication system, i.e., multiple UE (User Equipment, user equipment）The communication of equipment room can be directly carried out, and the data of communication need not do transfer by base station.

Reference picture 1, is the schematic diagram of a scenario of typical D2D systems.As shown in Fig. 1, LTE (Long Term Evolution, Long Term Evolution）Base station pass through PSS (Primary Synchronization Signal, master sync signal）Service UE below to it sends master sync signal.

UE in cellular link receives the PSS from LTE base station, the PSS received is detected and handled by receiver, the time synchronized and Frequency Synchronization with base station are obtained, then starts to receive the data from base station, follow-up every communication is realized.

UE in D2D links, its emitter transmitting PD2DSS (Primary D2D Synchronization Signal, main D2D synchronizing signals）, D2D emitter can be synchronized to according to the PD2DSS received so as to the receiver of the UE in D2D links, so as to receive the data from D2D emitters.

In Fig. 1, D2D communications i.e. can be in the range of honeycomb covering（As shown in UE1 standing grain mouthful UE2 in Fig. 1）, can also be outside the scope that honeycomb is covered（As shown in UE3 in Fig. 1 and UE4）.In addition, same UE can both carry out cellular communication, D2D communications can also be carried out（As shown in UE5 in Fig. 1）.Specifically, carry out which kind of communication is not divided by UE, but link as residing for UE is divided.UE i.e. in the cellular link or UE in D2D links, and for same UE, the conversion between two kinds of links is then by TDD (Time Division Duplex, time division duplex）Mode handle.

In the prior art, it is general that the PD2DSS used in D2D systems is directly used as using PSS.But, as shown in Figure 1, in tdd mode, D2D systems can both use sub-frame of uplink, can also use descending sub frame.And when using descending sub frame, if PD2DSS is identical with PSS, the UE of D2D links reception will be caused Machine is the detections of the cellular descending PSS mistakes of LTE into PD2DSS.Likewise, the UE of cellular link receiver may also can be the detections of the UE of the D2D links PD2DSS mistakes launched into PSS.

As can be seen here, in the prior art, PD2DSS is identical with PSS, it is possible to D2D systems can be caused to occur signal detection error, so as to reduce the communication performance of communication system.The content of the invention embodiment of the present invention provides a kind of for synchronous signaling method and device, can effectively improve the communication performance of D2D communication systems.

In a first aspect, disclosing a kind of sender unit for synchronization, described device includes：

First generation unit, for utilizing sequence b (n) to generate the sequence d (n) for synchronizing signal;Wherein, the length of the sequence d (n) for synchronizing signal is not less than the length of the sequence b (n)；

Second generation unit, for the sequence d (n) to be mapped into corresponding resource location, generates synchronous baseband signal s;

RF processing unit, for carrying out radio frequency processing to the baseband signal s；

Transmitting element, for the signal after RF processing unit processing to be sent.

In the first possible implementation of first aspect, the sequence b (n) is：

The initial value of perfect sequence；

Or,

The sequence that the perfect sequence is generated after discrete Fourier transform DFT；

Or,

The sequence that the perfect sequence is generated after inverse discrete Fourier transform IDFT；

Wherein, the perfect sequence is ZC sequences or GCL sequences.

With reference to the first possible implementation of first aspect and first aspect, in second of possible implementation of first aspect, first generation unit generates the sequence d (n) using following formula:

Z- 1

b(n), n = 0

d(n) =

LV\_

Wherein, L is odd number to b (n-l) n=- L.

With reference to second of possible implementation of first aspect, in the third possible implementation of first aspect, the sequence n) is：

b(n) = w;ⁿⁱⁿ^⁾ⁿ Wherein： W_N =_e—^J^W_N=e j are imaginary unit；U is the root sequence number of the sequence b (n)；The u and the L prime number each other.

With reference to the third possible implementation of first aspect, in the 4th kind of possible implementation of first aspect, the sequence d (n) of the first generation unit generation is：

Wherein, u is the root sequence number of the sequence d (n).

With reference to the third possible implementation of first aspect, the sequence d (n) that the first generation unit described in the 5th kind of possible implementation in first aspect is generated is：

Wherein, u is the root sequence number of the sequence d (n).

With reference to any of the above-described kind of possible implementation of first aspect and first aspect, in the 6th kind of possible implementation of first aspect, second generation unit includes：

First mapping subelement, for by sequence d (0) to d ((L-l)/2) Continuous Mappings to side of the index for k subcarrier, by sequence d ((L+l)/2) to d (L) Continuous Mappings to subcarrier opposite side of the index for k；The index is that data are 0 on k subcarrier.

With reference to the 6th kind of possible implementation of first aspect, in the 7th kind of possible implementation of first aspect, second generation unit also includes：

First baseband signal generates subelement, and the baseband signal s of Tong Walk is generated for the method using orthogonal frequency division multiplex OFDM.

With reference to the 7th kind of possible implementation of first aspect, in the 8th kind of possible implementation of first aspect, the sampled signal s (n) of the baseband signal s has centre symmetry and conjugation equality；Respectively：

s(n) = s(N -n),n = \,2,...,N -I

Wherein, N is the sampling number of the s (n)；

s_u(n) = s_v*(n),n = 0,1,2,...,N-\ Wherein, v=L-u, u and v are the sCn) root sequence number, the ^ and () are sCn) used root sequence number u and V expression formula.

With reference to any of the above-described kind of possible implementation of first aspect and first aspect, in the 8th kind of possible implementation of first aspect, second generation unit includes：

Second mapping subelement, for sequence d (0) to d (L) to be mapped into L+1 continuous equally spaced subcarrier in frequency domain.

With reference to the 9th kind of possible implementation of first aspect, in the tenth kind of possible implementation of first aspect, second generation unit also includes：

Second baseband signal generates subelement, for generating the synchronous baseband signal s using single-carrier frequency division multiple access SC-FDMA method.

With reference to the tenth kind of possible implementation of first aspect, in a kind of the tenth possible implementation of first aspect, the sampled signal s (n) of the baseband signal s has skew centrosymmetric and anti-communism yoke equality；Respectively： s(n) = -s(N-n),n = \,2,...,N-\

Wherein, N is the sampling number of the s (n)；

s_u(n) = -s_v'(n),n = 0,\,...,N-\

Wherein, v=L-u, u and V are the s (n) with sequence number, and described and () is that (nM official has used root sequence number u and V expression formula to s.

In the 12nd kind of possible implementation of first aspect, first generation unit generates the sequence d (n) using following formula to be included：

D (n)=b (n) ^n=0,1 .. " 1

Wherein, L is even number.

With reference to the 12nd kind of possible implementation of first aspect, in the 13rd kind of possible implementation of first aspect, the sequence n) is： b{n) = w¹²Wherein, ^=_e- or；J is imaginary unit；U is the root sequence number of the sequence b (n)；The u and the L prime number each other.

With reference to the 13rd kind of possible implementation of first aspect, in the 14th kind of possible implementation of first aspect, second generation unit includes：

3rd mapping subelement, for sequence d (0) to d (L-l) to be mapped into L continuous equally spaced subcarrier in frequency domain. With reference to the 14th kind of possible implementation of first aspect, in the 15th kind of possible implementation of first aspect, second generation unit also includes：

3rd baseband signal generates subelement, for generating the synchronous baseband signal s using single-carrier frequency division multiple access SC-FDMA method.

With reference to the 15th kind of possible implementation of first aspect, in the 16th kind of possible implementation of first aspect, second generation unit also includes：

4th baseband signal generates subelement, for the chip of the sequence d (n) to be arranged in order in the synchronizing signal for being placed on time domain.

With reference to the 16th kind of possible implementation of first aspect, in the 17th kind of possible implementation of first aspect, the sampled signal s (n) of the baseband signal s has centre symmetry and conjugation equality；Respectively： s(n) = s(N - n),n = \, 2, ...,N - \

Wherein, N is the sampling number of the s (n)；

5„(n) = = 0, 1, ...,N - 1

Wherein, v=2m*L-u, m are integer；U and v is to be described with sequence number, and (n) and () is the expression formula that the s (n) has used root sequence number u and V.

Second aspect, discloses a kind of signaling method for synchronization, and methods described includes：

The sequence d (n) for synchronizing signal is generated using sequence b (n);

The sequence d (n) is mapped to corresponding resource location, synchronous baseband signal s is generated;

The baseband signal s is carried out after radio frequency processing, sent；

Wherein, the length of the sequence d (n) for synchronizing signal is not less than the length of the sequence b (n).

In the first possible implementation of second aspect, the sequence b (n) is：

The initial value of perfect sequence；

Or,

Wherein, the perfect sequence is ZC sequences or GCL sequences.

It is described to utilize sequence b (n) to generate for the sequence d (n) of synchronizing signal to include in second of possible implementation of second aspect with reference to the first possible implementation of second aspect and first aspect： Wherein, L is odd number.

With reference to second of possible implementation of second aspect, in the third possible implementation of second aspect, the sequence b (n) is：

Wherein： W,_T=e ^ ^ W, j are imaginary unit；U is the root sequence number of the sequence b (n)；The u and the L prime number each other.

With reference to the third possible implementation of second aspect, in the 4th kind of possible implementation of second aspect, the sequence d (n) is：

Wherein, u is the root sequence number of the sequence d (n).

With reference to the third possible implementation of second aspect, in the 5th kind of possible implementation of second aspect, the sequence d (n) is：

Wherein, u is the root sequence number of the sequence d (n).

It is described the sequence d (n) is mapped to corresponding resource location to include in the 6th kind of possible implementation of second aspect with reference to any of the above-described kind of possible implementation of second aspect and first aspect：

Index is that data are 0 on k subcarrier;

By sequence d (0) to d ((L-l)/2) Continuous Mappings to side of the index for k subcarrier, by sequence d ((L+l)/2) to d (L) Continuous Mappings to subcarrier opposite side of the index for k.

With reference to the 6th kind of possible implementation of second aspect, in the 7th kind of possible implementation of second aspect, the synchronous baseband signal s is generated using the method for orthogonal frequency division multiplex OFDM.

With reference to the 7th kind of possible implementation of second aspect, in the 8th kind of possible implementation of second aspect In, the sampled signal s (n) of the baseband signal s has centre symmetry and conjugation equality；Respectively： s(n) = s(N -n),n = \,2,...,N -\

Wherein, N is the sampling number of the s (n)；

= = 0,1, 2,...,N-1

Wherein, v=L-u, u and V are the sCn) root sequence number, () and () are sCn) used root sequence number u and V expression formula.

It is described the sequence d (n) is mapped to corresponding resource location to include in the 8th kind of possible implementation of second aspect with reference to any of the above-described kind of possible implementation of second aspect and first aspect：

Sequence d (0) to d (L) is mapped in L+1 continuous equally spaced subcarrier in frequency domain.

With reference to the 9th kind of possible implementation of second aspect, in the tenth kind of possible implementation of second aspect, the synchronous baseband signal s is generated using single-carrier frequency division multiple access SC-FDMA method.

With reference to the tenth kind of possible implementation of second aspect, in a kind of the tenth possible implementation of second aspect, the sampled signal s (n) of the baseband signal s has skew centrosymmetric and anti-communism yoke equality；Respectively： s(n) = -s(N-n),n = \,2,...,N-\

Wherein, Ν is the sampling number of the s (n)；

s_u(n) = -s_v*(n),n = 0,1,...,Ν -I

Wherein, v=L-u, u and v are the s (n) with sequence number, and (nM official has used root sequence number u and V expression formula for s for () and ().

It is described to utilize sequence b (n) to generate for the sequence d (n) of synchronizing signal to include in the 12nd kind of possible implementation of second aspect：

d(n) = b(n),n = 0,1,...,L-l

Wherein, L is even number.

With reference to the 12nd kind of possible implementation of second aspect, in the 13rd kind of possible implementation of second aspect, the sequence n) is：B is { n)=w wherein, J is imaginary unit；U is the root sequence number of the sequence n)；The u and the L prime number each other.

It is described the sequence d (n) is mapped to corresponding resource location to include in the 14th kind of possible implementation of second aspect with reference to the 13rd kind of possible implementation of second aspect：

Sequence d (0) to d (L-l) is mapped in L continuous equally spaced subcarrier in frequency domain. With reference to the 14th kind of possible implementation of second aspect, in the 15th kind of possible implementation of second aspect, the synchronous baseband signal s is generated using single-carrier frequency division multiple access SC-FDMA method.

With reference to the 15th kind of possible implementation of second aspect, in the 16th kind of possible implementation of second aspect, the synchronous baseband signal s of the generation includes：

The chip of the sequence d (n) is arranged in order in the synchronizing signal for being placed on time domain.

With reference to the 16th kind of possible implementation of second aspect, in the 17th kind of possible implementation of second aspect, the sampled signal s (n) of the baseband signal s has centre symmetry and conjugation equality；Respectively： s(n) = s(N - n),n = \, 2, ...,N - \

Wherein, N is the sampling number of the s (n)；

s_u (n) = («),« = 0, 1, ...,N - 1

Wherein, v=2m*L-u, m are integer；U and v is to be described with sequence number, and (n) and () is the expression formula that s (n) has used root sequence number u and V

In methods described of the embodiment of the present invention and device, the sequence d (n) for synchronizing signal, and length of the length not less than sequence b (n) of the sequence d (n) for being used for synchronizing signal are generated using sequence b (n).And typical PSS is the even order that a length of L- 1 is generated by a length of L odd numbered sequences.

As can be seen here, the synchronizing signal for D2D that the embodiment of the present invention is obtained is different from PSS, avoid the problem of D2D system signals detection error caused by D2D synchronizing signal is identical with PSS, effectively improve the net synchronization capability and communication performance of D2D communication systems.Brief description of the drawings is in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, the required accompanying drawing used in embodiment or description of the prior art will be briefly described below, apparently, drawings in the following description are only some embodiments of the present invention, for those of ordinary skill in the art, without having to pay creative labor, other accompanying drawings can also be obtained according to these accompanying drawings.

Fig. 1 is the schematic diagram of a scenario of typical D2D systems；

Fig. 2 is used for synchronous signaling method flow chart for the embodiment of the present invention one；

Fig. 3 is to map the schematic diagram of the sequence d (n) using frequency domain in the embodiment of the present invention two；

Fig. 4 is the schematic diagram of Domain Synchronous signal transmitter mapping in the embodiment of the present invention three；

Fig. 5 is to map a schematic diagram of the sequence d (n) using frequency domain in the embodiment of the present invention three；

Fig. 6 is to map another schematic diagram of the sequence d (n) using frequency domain in the embodiment of the present invention three；

Fig. 7 is the structure chart of typical receiver； Fig. 8 is used for the structure chart of synchronous sender unit for the embodiment of the present invention.Embodiment is in order that those skilled in the art more fully understand the technical scheme in the embodiment of the present invention, and enable the above-mentioned purpose of the embodiment of the present invention, feature and advantage more obvious understandable, technical scheme in the embodiment of the present invention is described in further detail below in conjunction with the accompanying drawings.

The embodiment of the present invention provides the method and device that a kind of synchronizing signal is sent, and can effectively improve the communication performance of D2D communication systems.

Methods described of the embodiment of the present invention and the core thinking of device are：It is related to a kind of new sequence to generate D2D synchronizing signal so that the synchronizing signal is different from PSS, and has good correlation and symmetry using the synchronizing signal of generation.Thus do not influenceing to detect performance, on the premise of not improving detection complexity, it can solve to cause D2D systems to occur the problem of signal detection is slipped up because D2D synchronizing signal is identical with PSS, effectively improve the net synchronization capability and communication performance of D2D communication systems.

Reference picture 2, is to be used for synchronous signaling method flow chart described in the embodiment of the present invention one.As shown in Fig. 2 the described method comprises the following steps：

Step S101:The sequence d (n) for synchronizing signal is generated using sequence b (n);Wherein, the length of the sequence d (n) for synchronizing signal is not less than sequence b (n) length.

Step S102:The sequence d (n) is mapped to corresponding resource location, synchronous baseband signal s is generated;Step S103:The baseband signal s is carried out after radio frequency processing, sent.

In methods described of the embodiment of the present invention, the sequence d (n) for synchronizing signal, and length of the length not less than sequence b (n) of the sequence d (n) for being used for synchronizing signal are generated using sequence b (n).And typical PSS is the even order that a length of L-1 is generated by a length of L odd numbered sequences.So that, the D2D obtained using the embodiment of the present invention synchronizing signal is different from PSS, avoid the problem of D2D system signals detection error caused by D2D synchronizing signal is identical with PSS, effectively improve the net synchronization capability and communication performance of D2D communication systems.

The synchronous signaling method that is used for described in the embodiment of the present invention is described in detail with reference to specific embodiment.

Embodiment two：

In the methods described of the embodiment of the present invention two, the length of the sequence for synchronizing signal of generation is odd number, and this method may be directly applied to time domain scene or the frequency domain scene using multi-carrier modulation.

Specifically, in embodiment two, utilization sequence b (n) the formation sequence d (n) is specially： Z-l

B (n) ,=0 Shang

d{ri) = (1)

Z + l

B (n-l) n=- L wherein, b (n), n=0,1 .., L-I L be odd number.

As can be seen here, b (n) is a length of L odd numbered sequences, and standing grain I " is with sequence b (n) generations length（L+1 even order d (n)).The length of the sequence d (n) is more than sequence b (n) length.

And in the prior art, PSS is the even order that a length of L-1 is generated by a length of L odd numbered sequences, it can be seen that, the synchronizing signal that the embodiment of the present invention finally gives is different from PSS.

Further, the sequence b (n) can be a perfect sequence.The perfect sequence refers to the sequence with preferable periodic auto-correlation function value.Specifically, the perfection（2):

R_{u u} (τ) = * b* ((" + r)mod ) = (2)

0, τ ≠ 0 wherein, and mod is mod, | 6 () |²It is expressed as the arithmetic square of b (n) absolute values.It should be noted that in methods described of the embodiment of the present invention, the perfect sequence b (n) can be specially：ZC (Zadoff-Chu) sequences or GCL sequences.

Wherein, the ZC sequences and GCL sequences are respectively provided with extraordinary autocorrelation and very low cross correlation, and this performance can be used to produce synchronizing signal, realize the synchronous detection to time and frequency according to the synchronizing signal received so as to receiver.Specifically, when using ZC sequences as sequence b (n), the sequence b (n) can be expressed as：

(i ,=W (3) are wherein by b： V_N =e-^j V_N= ^_;J is imaginary unit；U is the root sequence number of the ZC sequences.Specifically, when using GCL sequences as sequence b (n), the sequence b (n) can be expressed as：

6(") = c(")*g((")mod/M)," = 0,U 1 (4)

Wherein, L=_s*m²;It is η) perfect sequence； g(n;), n=0, l .., m-l is the plural number that the amplitude of a length of m each element is 1, is： |g(«)| = l,« = 0,l,...,/7i-l.Sequence gCn) a kind of embodiment can be：A length of m Hadamard（Hadamard any row or a row) in matrix.

Need further exist in explanation, the embodiment of the present invention, the sequence b (n) can be a perfect sequence（Such as ZC sequences or GCL sequences）Initial value（Shown in as above-mentioned formula 3 and formula 4）Or the perfect sequence Row carry out DFT (Discrete Fourier Transform, DFT）Or IDFT (Inverse Discrete Fourier Transform, inverse discrete Fourier transform）Value afterwards.

Specifically, being illustrated below by taking ZC sequences as an example.

When carrying out the value after DFT as sequence b (n) using ZC sequences, the sequence b (n) can be expressed as：

When carrying out the value after IDFT as sequence b (n) using ZC sequences, the sequence b (n) can be expressed as:

1

∑b_t(m) (6) wherein, formula（5) and likes（6) in is the initial value of ZC sequences.

Several situations that sequence b (n) can be used are described above.Need exist for, it is emphasized that in actual applications, perfect sequence is not limited in ZC sequences and GCL sequences, in fact, any meet formula（2) perfect sequence may be used to the sequence b (n) described in the embodiment of the present invention, to realize the goal of the invention of the present invention, will not be repeated here.

Below still by taking ZC sequences as an example, when using ZC sequences as sequence b (n), the sequence d (n) for synchronizing signal of generation of the embodiment of the present invention can be specifically expressed as：

Or,

It should be noted that in embodiment two, L is odd number, the length of the sequence d (n) is L+l, and u is sequence d (n) root sequence number, and n represents the chip of the diverse location of sequence.Wherein, above-mentioned formula（7) and（8) it all can be used for generating the sequence d (n) of methods described of the embodiment of the present invention.

It should be further stated that, the sequence d (n) obtained in the embodiment of the present invention is (such as shown in formula 7 or formula 8）With centre symmetry, as described sequence d (n) meets：

d(n) = d(L-n),n = 0,\,...,L (9)

Also, the sequence d (n) also meets conjugation equality：

（"）= (")," = 0,1,. (10) Wherein, during v=L-u, u and v are the sequence dO) root sequence number, it is described (《) and () be（101；) use root sequence number u and V expression formula.

In actual applications, L value can specifically be set according to actual needs in the sequence d (n).In a kind of preferably embodiment, the L can be using value as 61.

Specially：

Or,

It should be noted that the length of the synchronizing signal has certain limitations.In LTE system, PSS is to occupy an OFDM (Orthogonal Frequency Division Multiplexing, OFDM）6 PRB in the bandwidth bosom of symbol bandwidth.In LTE system, a PRB takes 12 subcarriers, each subcarrier 15kHz in frequency domain.

Therefore, PSS signals take 15=1.08MHz of 6* 12* altogether.As, in LTE system, PSS signals take frequency domain will no more than 72 subcarriers.Simultaneously, it is contemplated that PSS signal frequency domains both sides also need to respectively vacate 5 subcarriers, and therefore, the length of PSS signals is generally 62.The length of similar synchronizing signal will not be over 72, and in view of the complexity of protection sub-carrier number and receiver, preferably length will not be over 64 subcarriers, and now 4 subcarriers are respectively vacated in both sides.

The sequence d (n) for synchronizing signal generated for the embodiment of the present invention two, the sequence d (n) is mapped into corresponding resource location is specially：It is the schematic diagram for mapping the sequence d (n) in the embodiment of the present invention two using frequency domain with reference to Fig. 3.It should be noted that being with LTE system, to be illustrated exemplified by 6 PRB amount to and length is placed on 72 subcarriers for 62 frequency domain sequence d (n) in Fig. 3.

As shown in figure 3, being illustrated so that length is 62 sequence d (n) as an example.Firstly the need of explanation, in Fig. 3, for untapped carrier wave, its implementation is that the data being mapped on untapped carrier wave are 0.

Specifically, the method that the sequence d (n) that the length is L+ 1 is mapped to frequency domain is：

In any chip of the index for not sequence of mapping on k subcarrier, data are 0 thereon.

By ^ (0) ... ^ ((- 1)/2) Continuous Mappings are to positioned at subcarrier side of the index for k（On the left of generally）Continuous equally spaced subcarrier on.General/(+1)/2) ..., /) Continuous Mappings to positioned at index for k subcarrier opposite side（On the right side of generally）Continuous equally spaced subcarrier on.Subcarrier k can be DC subcarriers.Need explanation , for DC subcarriers are correspondence receiver, i.e. the corresponding position of receiver centre frequency, in emitter, it corresponds to the central subcarrier for referring to emitter in system bandwidth.All abbreviation DC subcarriers in the present embodiment.

Generally, the subcarrier that the index is k can be DC subcarriers.Specifically, the mapping relations between data on each subcarrier that the d (n) and baseband signal map on carrier frequency are：

a_k =d(n),n = 0,l,...,L (13)

Wherein ,+the N/2 of k=n- (L+)/2；

Wherein parameter N values, for LTE descending OFDM modulation=^^ ^, the RB numbers wherein configured in N downlink bandwidths, N³Represent that in size of the resource block in frequency domain, LTE protocol be that 12, Ν maximum is the points that the time-domain signal occupies the corresponding IDFT of frequency domain bandwidth, for example 20MHz bandwidth correspondence Ν=2048.

Now, by ^ (0) ... ^ ((- 1)/2) Continuous Mappings are to the relative indexing on the left of the DC subcarriers

- (L+l)/2 ,-, on-l subcarrier.By i/ (CL+l)/2) ..., i/ CL) Continuous Mappings to the relative indexing on the right side of the DC subcarriers be ι, ι) on/2 subcarrier.

It is to illustrate exemplified by L=61 with reference to shown in Fig. 3, for the sequence d (n) that length is 62_:By ^ (0) ... ^ (30) Continuous Mappings to the relative indexing on the left of DC subcarriers are -31, on -1 subcarrier.Will/(31) ... ,/(61) Continuous Mappings to the relative indexing on the right side of DC subcarriers are 1, on 31 subcarrier;Data are on DC subcarriers

0.Specifically, the mapping relations between data on each subcarrier that now d (n) and baseband signal map on carrier frequency are：

a_k =d(n),n = 0,\,...,6\ (14)

Wherein, k=n-3l+N/2

In the embodiment of the present invention two, completed by above-mentioned method after mapping the frequency domain of the sequence d (n), OFDM conversion or IDFT conversion are done to obtained frequency-region signal again, frequency-region signal is transformed to time-domain signal, generate synchronous baseband signal s, and the baseband signal s is carried out after radio frequency processing, send.

Specifically, the radio frequency processing can be that the processing such as up-conversion, filtering is carried out to baseband signal.

Thus being achieved that described in the embodiment of the present invention two is used for the sending method of synchronous signal.

The generation method of baseband signal s described in the embodiment of the present invention two is identical with the generation method of the downgoing baseband signal in LTE system.It will not be repeated here.

Only just the time-domain signal that frequency-region signal generated after OFDM conversion is simply described below.Specifically, in the embodiment of the present invention two, the expression formula of the time-domain signal can be：

s(t)= ∑ ' ² ₊X i (15)

=- LN/2」 k=\

=k + lN/2],k⁺⁾=k+lN/2]-l, wherein t represents time-domain signal s (t) time independent variable；

Δ/and it is subcarrier spacing, its value can be 15kHz or 7.5kHz in LTE system; a_kRefer to the value that frequency domain data is mapped to after the corresponding value after corresponding carriers, including synchronizing sequence mapping；Wherein, for LTE descending OFDM modulation for=^^ ^, the RB numbers wherein configured in N downlink bandwidths, N³Represent that in size of the resource block in frequency domain, LTE protocol be that 12, Ν maximum is the points that the time-domain signal occupies the corresponding IDFT of frequency domain bandwidth, for example 20MHz bandwidth correspondence Ν=2048. use above-mentioned formula（15) the root sequence of generation is u baseband signals s sampled signal s (n), mark can be expressed as () again for convenience,=0,1,2, ..., N-1, the sampled signal () can be simultaneously comprising the data-signal in synchronizing signal and other carrier waves.

It should be noted that：Because the sequence d (n) that the embodiment of the present invention is generated has centre symmetry（Shown in formula 9）And conjugation properties equivalent（Shown in formula 10）, and employing the mapping method shown in Fig. 3 so that the baseband signal s only generated comprising the present embodiment sampled signal s (n) equally has centre symmetry and conjugation correlation properties.

Specifically, sampled signal s (n) signals of the baseband signal s have centre symmetry：

s(n) = s(N -n),n = \,2,...,N -\ (16)

When_V=L-_UWhen, the sequence has conjugation properties equivalent：

s_u(n) = s_v*(n),n = 0,1,2,...,N-l (17)

Represent (), complex conjugate computing.Receiver obtains baseband sampling signal r (n) after above-mentioned signal synchronizing signal is received through over-sampling, and the r (n) has above-mentioned formula（14) and（15) symmetry characteristic, receiver can be by above-mentioned（And above formula 16)（17) the characteristics of, does the simplified operation for receiving matched filtering.

Further, illustrated by taking existing typical a length of 62 PSS sequences as an example, PSS sequences are generated by a length of 63 ZC sequences, and in the embodiment of the present invention, then a length of 61 ZC sequences can be used to carry out formation sequence d (n).Due to when selecting ZC sequences, its root sequence number u must be with the length L of ZC sequences prime number each other.Then in the prior art, the ZC sequences for a length of 63, the collection of eligible sequence number is combined into：2,4,5,8,10,11,13,16,17,19,20,21,22,23,25,26,29,31,32,34,37,38,40,41,43,44,46,47,49,50,53,55,58,59,61,62 }, 37 sequences altogether.

Also, to ensure that the difference between the cross correlation between sequence, the root sequence number of any two sequence must be coprime with sequence length L.Exemplified by 3 sequences of PSS in still LTE.The root sequence number of PSS 3 sequences is respectively 25,29,34, then the difference of 25 and 34 root sequence number is not coprime relation for 9,9 and 63, and therefore, the cross correlation in practice between 25 and 34 two sequences is poor.

And for a length of 61 sequence described in the embodiment of the present invention two, because 61 be prime number in itself, if still using root sequence number u for 25,29,34 sequence, then the difference and sequence length 61 between the root sequence number of any two sequence are all coprime, therefore the correlation between multiple sequences is just guaranteed.And because 61 be prime number, altogether 60 sequences with different sequence number u values can be produced, no matter can be guaranteed come the correlation generated between different synchronizing signals, sequence using which in this 60 sequences.

As can be seen here, the method for the present embodiment, provides new option, also, in a length of 62 design process of synchronizing signal is similarly used for, there is obvious advantage for the selection of sequence in the generating process of the synchronizing signal of length-specific.

Therefore, if the method that is provided using the embodiment of the present invention two of emitter launches synchronizing signal, when needing to launch the synchronizing signal of more than one, sequence can be pressed as much as possible_V=L-_UPaired mode is generated.

From above-mentioned, in the methods described of the embodiment of the present invention two, the sequence d (n) for synchronizing signal, and length of the length not less than sequence b (n) of the sequence d (n) for being used for synchronizing signal are generated using perfect sequence b (n).It is possible thereby to so that, the synchronizing signal obtained using the embodiment of the present invention is different from PSS, it is to avoid the problem of D2D system signals detection error caused by synchronizing signal is identical with PSS, effectively improves the net synchronization capability and communication performance of D2D communication systems.

Meanwhile, in the embodiment of the present invention two, use the perfect sequence of a length of L odd length（Such as ZC sequences or GCL sequences）Next life grows into the sequence of L+1 even lengths.Compared with the existing odd numbered sequences by a length of L generate a length of L-1 even order, a kind of many methods of parameter selection of sequence that the embodiment of the present invention two is generated.

Further, under some parameters, the method for the embodiment of the present invention two has obvious advantage.Such as, it is to use length to be generated for 63 ZC sequences with the method for prior art when length to be generated is 62 sequence.And 63 be a non-plain integer, so for the sequence of generation, the parameter selection of its correlated performance and root sequence number all receives larger limitation.And the method for using the embodiment of the present invention two, then the sequence that the length is 62 can be generated with a length of 61 ZC sequences, because 61 be prime number, the sequence root sequence number to generation is not limited, and its correlated performance is more preferable.Embodiment three：

In the methods described of the embodiment of the present invention three, the length of the sequence for synchronizing signal of generation is even number, and this method may be directly applied to frequency domain SC-FDMA (the Single-carrier Frequency-Division Multiple Access, single-carrier frequency division multiple access of time domain scene or DC-free carrier wave）Modulate scene.

Specifically, in embodiment three, utilization sequence b (n) the formation sequence d (n) is specially：

d(n) = b(n),n = 0, \, ...,L - \ ( 18 )

Wherein, L is even number.

In the embodiment of the present invention three, sequence b (n) and sequence d (n) length are L.

Further, the sequence b (n) can be a perfect sequence.The perfect sequence is identical with described in embodiment two.Specifically, the perfect sequence b (n) can be specially：ZC sequences or GCL sequences.

Specifically, when using ZC sequences as sequence b (n), the sequence b (n) can be expressed as： b(n) = W " ¹²(19) wherein：！^ ^- or ^/;L is the length of sequence；U is the root sequence number of sequence；The u and the L prime number each other.

Need further exist in explanation, the embodiment of the present invention three, the sequence b (n) can be a perfect sequence（Such as ZC sequences or GCL sequences）Initial value or the perfect sequence carry out DFT or IDFT after value.

Specifically, being illustrated below by taking ZC sequences as an example.

It is expressed as when using：

When carrying out the value after IDFT as sequence b (n) using ZC sequences, the sequence b (n) can be expressed as：

Wherein, formula（20) and likes（21) in is the initial value of ZC sequences.

In the embodiment of the present invention three, L is even number, the sequence d (n) of generation length is L, u is sequence d (n) root sequence number, it must be coprime with sequence length L, further, when u is more guaranteed for the correlated performance of prime number time series, n represents the chip of the diverse location of sequence.

It should be further stated that, the sequence d (n) obtained in the embodiment of the present invention has centre symmetry, and as described sequence d (n) meets：

d(n) = d(L -n),n = \,...,L - \ (22)

Also, the sequence d (n) also meets conjugation equality：

("） = <(")," = 0,1,. (23 )

Wherein,_{u + v} = ,_mZ, u and V are the root sequence number of the sequence d (n), expression formula described and that root sequence number u and V has been used for d (n).During such as m=0, or during m=l, have： v = -u , v = 2L - u₀In actual applications, L value can specifically be set according to actual needs in the sequence d (n).One kind compared with In excellent embodiment, the L can be using value as 64 or be 62.

Specifically, as L=64, corresponding length is for 64 sequence d (n) expression：I (")=e-; "=0,1 ..., 63 (24) or, d ()=e ^ ,=0,1, ..., 63 (25) are specifically, as L=62, corresponding length is for 62 sequence d (n) expression：I (")=e-; "=0,1 ..., 61 (26) or, i (")=i, "=0, l, ..., 61 (27) are it should be noted that method described in the embodiment of the present invention three, can be used for time domain can be used for the frequency domain scene of DC-free carrier wave.

(1) methods described of the embodiment of the present invention three is applied to temporal modulation scene

Reference picture 4, is the schematic diagram of Domain Synchronous signal transmitter mapping in the embodiment of the present invention three.When methods described is used for time domain scene, as shown in figure 4, for transmitter side, in some frame or subframe of baseband signal, at least placed a synchronizing signal.Specifically, the frame or subframe are a time span for placing data, the synchronizing signal is placed on some position of this time span.And, in the synchronizing signal, the chip for the sequence d (n) that the embodiment of the present invention three is generated is arranged in order placement, as shown in Figure 4.

When methods described is used for time domain scene, the baseband signal s for the synchronizing signal that root sequence generates for u ZC sequences, marking can be expressed as () for convenience again ,=0,1,2 ..., N-1.Baseband signal s equivalent sampling signal s (n) also has centre symmetry in receiving side, receiver, i.e.,：

s(n) = s(N-n),n = \,...,N-\ (28)

Wherein, Ν is sampling number.

Also, as the Z- of v=2_M, _eDuring Z, sequence ^) and sequence (《) between have conjugation properties equivalent： s_u(n) = s_v'(n),n = 0X...,N-\ (29)

As m=0, there is v=- u, have v=2L-u as m=l.

(2) methods described of the embodiment of the present invention three is applied to SC-FDMA and modulates scene

The sequence d (n) for PD2DSS generated for the embodiment of the present invention three, the sequence d (n) is mapped into corresponding resource location is specially：It is described using frequency domain mapping respectively in the embodiment of the present invention three with reference to Fig. 5 and Fig. 6 Sequence d (n) schematic diagram and another schematic diagram.It should be noted that being with LTE system, to be illustrated exemplified by 6 PRB amount to and length is placed on 72 subcarriers for 64 frequency domain sequence d (n) in Fig. 5 and 6

As shown in figure 5, being illustrated so that length is 64 sequence d (n) as an example.In the embodiment of the present invention three, by sequence d (n) from d (0) to d L -1) it is mapped in L continuous equally spaced subcarrier in frequency domain.Wherein, the L continuous equally spaced subcarrier in frequency domain can include DC subcarriers, can not also include DC subcarriers.

If specifically, the L continuous equally spaced subcarrier in frequency domain include DC subcarriers, as shown in Fig. 5, sequence d (n) chip diJ T are mapped on the DC subcarriers.

If not including DC subcarriers in the L continuous nonseptate subcarrier in frequency domain, as shown in Figure 6.In the embodiment of the present invention three, completed by above-mentioned method after mapping the frequency domain of the sequence d (n), SC-FDMA conversion is done to obtained frequency-region signal again, frequency-region signal is transformed to time-domain signal, synchronous baseband signal s n is generated) send.

Thus being achieved that described in the embodiment of the present invention three is used for the sending method of synchronous signal.

The generation method of SC-FDMA baseband signal s (n) described in the embodiment of the present invention three is identical with the generation method of the up SC-FDMA baseband signals in LTE system.It will not be repeated here.

Specifically, in the embodiment of the present invention three, the expression formula of the SC-FDMA baseband signals can be：

「

S (t)=X-, t (30) wherein, Δ/be subcarrier spacing, its value can be 15kHz or 7.5kHz in LTE system, and wherein t represents time-domain signal s (t) time independent variable；

k" = A + LN/2」；

It is the value that frequency domain data is mapped to after the corresponding value after corresponding carriers, including synchronizing sequence mapping；In LTE up SC-FDMA modulation for N=, wherein N^ represents the RB numbers configured in upstream bandwidth, N³Represent that in size of the resource block in frequency domain, LTE protocol be that 12, Ν maximum is the points that the time-domain signal occupies the corresponding IDFT of frequency domain bandwidth, for example 20MHz bandwidth correspondence Ν=2048.

Method described in the embodiment of the present invention three, is suitable for the signal based on the up SC-FDMA modulation systems of LTE and sends.And in D2D research, in FDD (Frequency Division Duplexing, FDD）With TDD (Time Division Duplexing, time division duplex）Up transmission in, be required for the modulation system using SC-FDMA.If therefore the UE in D2D systems sends synchronizing signal by the method for the present embodiment three, it will system is become simpler, but also the advantage of low peak average ratio can be obtained.

Here, the basic structure and operation principle to UE receiver are simply introduced.It is the structure chart of typical receiver shown in reference picture 7.Certainly, in actual applications, the mechanism of receiver is not limited to shown in Fig. 7, and the embodiment of the present invention is only that the course of work to receiver by taking the structure shown in Fig. 7 as an example is simply introduced. As shown in fig. 7, UE receiver is received at antenna 701 includes synchronizing signal from emitter！<T), and by the r (t) send to RF (the Radio Frequency, radio frequency of receiver）Module 702 is handled, wherein, RF modules 702 include a series of filtering down conversion process, and its target is by signal limiting in certain bandwidth range, so as to ADC (Analog to Digital Converter, analog-digital converter）703 can realize and effectively be sampled.Then the data after the quantization exported to ADC 703 carry out down coversion（Low-converter 704) processing, the purpose of down coversion is to translate the signals into baseband signal.The signal that low-converter 704 is exported again is by low pass filter 705, that is, the baseband signal r (n) needed.

When needing synchronous, the signal where exactly needing to filter out at least synchronizing signal in bandwidth, so that receiver synchronizes the detection of signal.Especially, in the modulation system using SC-FDMA, receiver needs first to remove the deviant of 1/2 carrier wave before baseband signal, then carries out Base-Band Processing to obtained baseband signal again.Wherein, going the process of 1/2 carrier wave can realize in RF modules 702, can also be realized in low-converter 704.The method of realization is, when frequency conversion, and receiver removes the frequency deviation value of 1/2 carrier wave.

For remove the reception signal r after 1/2 carrier offset values (；), with centre symmetry, g Jie：

r_u(n) = r_u(N -n),n = \,...,N -\ (31)

Also, as the Z- of v=2_M, _eHave during Z, r (^Pr_v() has conjugation equality：

r_u(n) = r_v(n), n=0X..., N- (32) example IV：

In the embodiment of the present invention four, formation sequence d (n) method is identical with the embodiment of the present invention two, is using odd numbered sequences b (n) the generations length that length is L（L+1 even order d (n)).Brief introduction is only provided below, described in specific generating process be the same as Example two, is repeated no more.

Specifically, in example IV, utilization sequence b (n) the formation sequence d (n) is specially：

Wherein, b (n), n=0,1 .., L-I L are odd number.

As can be seen here, b (n) is a length of L sequence, is using sequence b (n) generations length（L+1 d (n)).The length of the sequence d (n) is more than sequence b (n) length.

It is possible thereby to so that, the synchronizing signal that the embodiment of the present invention finally gives is different from PSS.

In the methods described of the embodiment of the present invention four, the perfect sequence b (n) can be specially：ZC sequences or GCL sequences. When using ZC sequences as sequence b (n), the sequence b (n) can be expressed as:

b(n) = W"^n<n+1)'²

W_N=e ^ΎOr W_N=e i；J is imaginary unit；U is the root sequence number of the ZC sequences, when using ZC sequences as sequence b (n), and the sequence d (n) for synchronizing signal of generation of the embodiment of the present invention can be specifically expressed as：

Or,

It should be noted that in example IV, L is odd number, the length of the sequence d (n) is L+l, and u is sequence d (n) root sequence number, and n represents the chip of the diverse location of sequence.Wherein, above-mentioned formula（7) and（8) it all can be used for generating the sequence d (n) of methods described of the embodiment of the present invention.

It should be further stated that, the sequence d (n) for working as the root Serial No. u for using ZC sequences to generate obtained in the embodiment of the present invention is (such as shown in formula 7 or formula 8）With centre symmetry, as described sequence d (n) meets, and states for convenience, here d (n) cUn) represent：

d(n) = d(L-n),n = 0,\,...,L (9)

Also, the sequence d (n) also meets conjugation equality：

d_u(n)=d_v*(n),n = 0,\,...,L (10)

Wherein, during v=L-u, u and V are the sequence dO) root sequence number, it is described (《) and () be（101；) use root sequence number u and V expression formula.

From unlike the embodiment of the present invention two, four kinds of the embodiment of the present invention, to the sequence d (n) of generation using the frequency domain mapping method and SC-FDMA modulator approach described in embodiment three.

Specifically, in the embodiment of the present invention four, by sequence d (n) from ^ (0) to being mapped in L+1 continuous nonseptate subcarrier in frequency domain.Wherein, the L+1 continuous nonseptate subcarrier in frequency domain can include DC subcarriers, DC subcarriers can not also be included.

Specifically, in the embodiment of the present invention four, completed by above-mentioned method after mapping the frequency domain of the sequence d (n), SC-FDMA conversion is done to obtained frequency-region signal again, frequency-region signal is transformed to time-domain signal, the synchronous baseband signal s (n) of generation is sent.

Thus being achieved that described in the embodiment of the present invention four is used for the sending method of synchronous signal.

It should be noted that, four kinds of the embodiment of the present invention, its receiver structure is similar with the embodiment of the present invention three, and its difference is, the receiver of example IV filters out the frequency shift (FS) of 1/2 carrier wave during the reception to synchronizing signal, not before baseband signal.That is, being the frequency shift (FS) for including 1/2 carrier wave introduced in SC-FDMA modulated process in the baseband signal of synchronizing signal.

The difference causes, in the embodiment of the present invention four, and the SC-FDMA baseband signals s of generation sampled signal s (n) has skew centrosymmetric, SP:

s(n) = -s(N - n),n = \, 2, ..., N - \ ( 33 )

Wherein, N is sampling number.

Also, work as ^!^!When, sequence ^) and sequence (《) between have anti-communism yoke properties equivalent：

s_u (n) = -s_v* (n), n=0,1,2 ..., N-l (34) receivers, can be by above-mentioned after the signal of over-sampling version of above-mentioned signal s (n) is received（33) sending method for synchronizing signal provided in the embodiment of the present invention is described in detail simplified operation three specific embodiments of above-mentioned combination that with above formula (34) the characteristics of does reception matched filtering.From the various embodiments described above, and the method that the present invention is provided, from above-mentioned, in the methods described of the embodiment of the present invention two, the sequence d (n) of the synchronizing signal for D2D is generated using perfect sequence b (n), so that, the synchronizing signal obtained using the embodiment of the present invention is different from PSS, avoid the problem of D2D system signals detection error caused by D2D synchronizing signal is identical with PSS, effectively improve the net synchronization capability and communication performance of D2D communication systems.

Further, in the embodiment of the present invention two and four, the perfect sequence of a length of L odd length is used（Such as ZC sequences or GCL sequences）Next life grows into the sequence of L+1 even lengths.Compared with the existing odd numbered sequences by a length of L generate a length of L-1 even order, a kind of many methods of parameter selection of the sequence of generation of the embodiment of the present invention.

Further, under some parameters, the method for the embodiment of the present invention two has obvious advantage.Such as, it is to use length to be generated for 63 ZC sequences with the method for prior art when length to be generated is 62 sequence.And 63 be a non-plain integer, so for the sequence of generation, the parameter selection of its correlated performance and root sequence number all receives larger limitation.And use the embodiment of the present invention two method, then can with a length of 61 ZC sequences come The sequence that the length is 62 is generated, because 61 be prime number, the sequence root sequence number to generation is not limited, and its correlated performance is more preferable.

Further, the method described in the embodiment of the present invention three and four, can apply to frequency domain SC-FDMA modulation scenes, solves the defect that the method for prior art cannot be directly used in the system of SC-FDMA modulation systems.It is used for synchronous signaling method corresponding to provided in an embodiment of the present invention, the embodiment of the present invention additionally provides a kind of for synchronous sender unit.Reference picture 8, is the structure chart of the sender unit provided in an embodiment of the present invention for being used for synchronization.

As shown in figure 8, described device can include：First generation unit 801, the second generation unit 802, RF processing unit 803 and transmitting element 804.

First generation unit 801, for utilizing sequence b (n) to generate the sequence d (n) for synchronizing signal;Wherein, the length of the sequence d (n) for synchronizing signal is not less than the length of the sequence b (n).

Second generation unit 802, for the sequence d (n) to be mapped into corresponding resource location, generates synchronous baseband signal s.

The RF processing unit 803, for carrying out radio frequency processing to the baseband signal s.

The transmitting element 804, sends for the signal after the RF processing unit 803 is handled.In described device of the embodiment of the present invention, the sequence d (n) for synchronizing signal, and length of the length not less than sequence b (n) of the sequence d (n) for being used for synchronizing signal are generated using sequence b (n).And typical PSS is the even order that a length of L-1 is generated by a length of L odd numbered sequences.So that, the D2D obtained using the embodiment of the present invention synchronizing signal is different from PSS, avoid the problem of D2D system signals detection error caused by D2D synchronizing signal is identical with PSS, effectively improve the net synchronization capability and communication performance of D2D communication systems.

It is preferred that, the sequence b (n) can be：The initial value of perfect sequence；Or, the sequence that the perfect sequence is generated after discrete Fourier transform DFT；Or, the sequence that the perfect sequence is generated after inverse discrete Fourier transform IDFT.

Wherein, the perfect sequence can be ZC sequences or GCL sequences.

In the first scenario, the length of the sequence for synchronizing signal of generation of the embodiment of the present invention is odd number, and this method may be directly applied to time domain scene or the frequency domain scene using multi-carrier modulation.

Now, first generation unit 801 generates the sequence d (n) using following formula:

Z- 1

b(n), n = 0

d(n) = ( 1 )

L + l

b(n - l), n …

2 Wherein, L is odd number.

Specifically, the sequence b (n) can be:

B (n)=W " " China (3) is wherein： W_N J is imaginary unit；U is the root sequence number of the sequence b (n)；The u and the L prime number each other.

One generation unit 801 generation sequence d (n) be：

Wherein, u is the root sequence number of the sequence d (n).

Or, the sequence d (n) that first generation unit 801 is generated can be:

Wherein, u is the root sequence number of the sequence d (n).

In the first scenario, second generation unit 802 can include：

First mapping subelement, for sequence d (0) to be arrived into d ((L-l)/2) Continuous Mappings to side of the index for k subcarrier, by sequence d ((L+l)/2;>The subcarrier opposite side for being k to the index to d (L) Continuous Mappings；The index is that data are 0 on k subcarrier.

Further, second generation unit 802 can also include：

First baseband signal generates subelement, for generating the synchronous baseband signal s using the method for orthogonal frequency division multiplex OFDM.

It is preferred that, the sampled signal s (n) of the baseband signal s has centre symmetry and conjugation equality；Respectively： s(n) = s(N-n),n = \,2,...,N-\ (16)

Wherein, N is the sampling number of the s (n)；

s_u(n) = s_v*(n),n = 0,1,2,...,N-l (17)

Wherein, v=L-u, u and v are the sCn) root sequence number, the ^ and () are sCn) used root sequence number u and V expression formula.

Further, second generation unit 802 can also include： Second mapping subelement, for sequence d (0) to d (L) to be mapped into L+1 continuous equally spaced subcarrier in frequency domain.

Corresponding, second generation unit 802 also includes：

It is preferred that, the sampled signal s (n) of the baseband signal s has skew centrosymmetric and anti-communism yoke equality；Respectively：

s(n) = -s(N-n),n = \,2,...,N-\ (33)

Wherein, N is the sampling number of the s (n)； Wherein, v=L-u, u and V are the s (n) with sequence number, and described and () is that (nM official has used root sequence number u and V expression formula to s.

In the case of second, the length of the sequence for synchronizing signal of generation of the embodiment of the present invention is even number, and this method may be directly applied to time domain scene or the frequency domain SC-FDMA modulation scenes of DC-free carrier wave.

Now, first generation unit 801 generates the sequence d (n) using following formula and included：

D (n)=b (n) ^n=0,1 .. " 1 (18)

Wherein, L is even number.

Specifically, the sequence b (n) is： b{n) = w¹²(19) wherein, ^=_e- or；J is imaginary unit；U is the root sequence number of the sequence b (n)；The u and the L prime number each other.

In the case of second, second generation unit 802 can include：

3rd mapping subelement, for sequence d (0) to d (L-l) to be mapped into L continuous equally spaced subcarrier in frequency domain.

Further, second generation unit 802 can also include：

It is preferred that, second generation unit 802 also includes：

4th baseband signal generates subelement, and the same of time domain is placed on for the chip of the sequence d (n) to be arranged in order Walk in signal.

Specifically, the sampled signal s (n) of the baseband signal s has centre symmetry and conjugation equality；Respectively: s(n) = s(N -n),n = \,2,...,N -\ (28)

Wherein, N is the sampling number of the s (n)；

s_u (n) = («),« = 0,1,...,N-1 (29)

Wherein, v=2m*L-u, m are integer；U and v is to be described with sequence number, and (n) and () is the expression formula that s (n) has used root sequence number u and V.Each embodiment in this specification is described by the way of progressive, and identical similar part is mutually referring to what each embodiment was stressed is the difference with other embodiment between each embodiment.For system embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, the relevent part can refer to the partial explaination of embodiments of method.

The embodiments of the present invention described above are not intended to limit the scope of the present invention.Any modifications, equivalent substitutions and improvements made within the spirit and principles in the present invention etc., should be included in the scope of the protection.

Claims

Claim

1st, it is a kind of to be used for synchronous sender unit, it is characterised in that described device includes：First generation unit, for utilizing sequence b (n) to generate the sequence d (n) for synchronizing signal;Wherein, the length of the sequence d (n) for synchronizing signal is not less than the length of the sequence b (n)；

Second generation unit, for the sequence d (n) to be mapped into corresponding resource location, generates synchronous baseband signal s;

RF processing unit, for carrying out radio frequency processing to the baseband signal s；

Transmitting element, for the signal after RF processing unit processing to be sent.2nd, it is according to claim 1 to be used for synchronous sender unit, it is characterised in that the sequence b (n) is：

The initial value of perfect sequence；

Or,

The sequence that the perfect sequence is generated after discrete Fourier transform DFT；

Or,

The sequence that the perfect sequence is generated after inverse discrete Fourier transform IDFT；

Wherein, the perfect sequence is ZC sequences or GCL sequences.

3rd, it is according to claim 1 or 2 to be used for synchronous sender unit, it is characterised in that the first generation unit of institute generates the sequence d (n) using following formula:

Wherein, L is odd number_t

4th, it is according to claim 3 to be used for synchronous sender unit, it is characterised in that the sequence b (n) is：

b(n) = W^^(n+l)l2Wherein： W_N = e—^j W_N = e^J；J is imaginary unit；U is the root sequence number of the sequence b (n)；The u and the L prime number each other. 5th, it is according to claim 4 to be used for synchronous sender unit, it is characterised in that the sequence d (n) of the-generation unit generation is：

Wherein, u is the root sequence number of the sequence d (n).

6th, it is according to claim 4 to be used for synchronous sender unit, it is characterised in that the sequence d (n) of the first generation unit generation is：

Wherein, u is the root sequence number of the sequence d (n)₍

7th, it is used for synchronous sender unit according to any one of claim 1 to 6, it is characterised in that second generation unit includes：

First mapping subelement, for by sequence d (0) to d ((L-l)/2) Continuous Mappings to side of the index for k subcarrier, by sequence d ((L+l)/2) to d (L) Continuous Mappings to subcarrier opposite side of the index for k；The index is that data are 0 on k subcarrier.

8th, it is according to claim 7 to be used for synchronous sender unit, it is characterised in that second generation unit also includes：

First baseband signal generates subelement, for generating the synchronous baseband signal s using the method for orthogonal frequency division multiplex OFDM.

9th, it is according to claim 8 to be used for synchronous sender unit, it is characterised in that the sampled signal s (n) of the baseband signal s has centre symmetry and conjugation equality；Respectively：

s(n) = s(N - n),n = \, 2, ..., N - \

Wherein, N is the sampling number of the s (n)； s_u(n) = s_v*(n),n = 0,1,2,...,N -I

Wherein, v=L-u, u and v are the sCn) root sequence number, the ^ and () are sCn) used root sequence number u and V expression formula.10th, it is used for synchronous sender unit according to any one of claim 1 to 6, it is characterised in that second generation unit includes：

Second mapping subelement, for sequence d (0) to d (L) to be mapped into L+1 continuous equally spaced subcarrier in frequency domain.11st, it is according to claim 10 to be used for synchronous sender unit, it is characterised in that second generation unit also includes：

Second baseband signal generates subelement, for generating the synchronous baseband signal s using single-carrier frequency division multiple access SC-FDMA method.12nd, it is according to claim 11 to be used for synchronous sender unit, it is characterised in that the sampled signal s (n) of the baseband signal s has skew centrosymmetric and anti-communism yoke equality；Respectively：

s(n) = -s(N-n),n = \,2,...,N-\

Wherein, N is the sampling number of the s (n)；

s_u(n) = -s_v*(n),n = 0,l,...,N-l

Wherein, v=L-u, u and V are the s (n) with sequence number, the ^) and () be that (nM official has used root sequence number U and V expression formula to s.

13rd, it is according to claim 1 or 2 to be used for synchronous sender unit, it is characterised in that first generation unit generates the sequence d (n) using following formula to be included：

d(n) = b(n),n = 0,1,...,L-l

Wherein, L is even number.

14th, it is according to claim 13 to be used for synchronous sender unit, it is characterised in that the sequence b (n) is：B is { n)=w wherein, J is imaginary unit；U is the root sequence number of the sequence n)； The u and the L prime number each other.

15th, it is used for synchronous sender unit according to claim 13 or 14, it is characterised in that second generation unit includes：

3rd mapping subelement, for sequence d (0) to d (L- l) to be mapped into L continuous equally spaced subcarrier in frequency domain.

16th, it is according to claim 15 to be used for synchronous sender unit, it is characterised in that second generation unit also includes：

3rd baseband signal generates subelement, for generating the synchronous baseband signal s using single-carrier frequency division multiple access SC-FDMA method.

17th, it is used for synchronous sender unit according to claim 13 or 14, it is characterised in that second generation unit also includes：

4th baseband signal generates subelement, for the chip of the sequence d (n) to be arranged in order in the synchronizing signal for being placed on time domain.

18th, it is according to claim 17 to be used for synchronous sender unit, it is characterised in that the sampled signal s (n) of the baseband signal s has centre symmetry and conjugation equality；Respectively：

s(n) = s(N - n),n = \, 2, ...,N - \

Wherein, N is the sampling number of the s (n)；

5„(n) = = 0, 1, ...,N - 1

Wherein, v=2m*L-u, m are integer；U and v is the sO) with sequence number, (n) and () is the expression formula that the s (n) has used root sequence number u and V.

19th, it is a kind of to be used for synchronous signaling method, it is characterised in that methods described includes：The sequence d (n) for synchronizing signal is generated using sequence b (n);

The sequence d (n) is mapped to corresponding resource location, synchronous baseband signal s is generated;

The baseband signal s is carried out after radio frequency processing, sent；

Wherein, the length of the sequence d (n) for synchronizing signal is not less than the length of the sequence b (n).

20th, method according to claim 19, it is characterised in that the sequence b (n) is： The initial value of perfect sequence；

Or,

The sequence that the perfect sequence is generated after discrete Fourier transform DFT；

Or,

The sequence that the perfect sequence is generated after inverse discrete Fourier transform IDFT；

Wherein, the perfect sequence is ZC sequences or GCL sequences.

21st, the method according to claim 19 or 20, it is characterised in that described to utilize sequence b (n) to generate for the sequence d (n) of synchronizing signal to include：

Z-1

b(n), " = 0,1,...,」

2

d(n) =

L + l

B (n-), wherein, L is odd number to n=L.

22nd, method according to claim 21, it is characterised in that the sequence b (n) is：

b(n) = w;^n<n+Wherein： W_N =e-^j2 V_N=/ ；J is imaginary unit；U is the root sequence number of the sequence b (n);The u and the L prime number each other.

23rd, method according to claim 22, it is characterised in that the sequence d (n) is：

Wherein, u is the root sequence number of the sequence d (n).

24th, method according to claim 22, it is characterised in that the sequence d (n) is:

γ

e ^^' " = 0,1,...,^

2

d(n) =

Z + l _τ

e ^L n = ,...,L Wherein, u is the root sequence number of the sequence d (n).

25th, the method according to any one of claim 19 to 24, it is characterised in that described the sequence d (n) is mapped to corresponding resource location to include：

Index is that data are 0 on k subcarrier;

By sequence d (0) to d ((L-l)/2) Continuous Mappings to side of the index for k subcarrier, by sequence d ((L+l)/2) to d (L) Continuous Mappings to subcarrier opposite side of the index for k.

26th, method according to claim 25, it is characterised in that the synchronous baseband signal s is generated using the method for orthogonal frequency division multiplex OFDM.

27th, method according to claim 26, it is characterised in that the sampled signal s (n) of the baseband signal s has centre symmetry and conjugation equality；Respectively：

s(n) = s(N -n),n = \,2,...,N -\

Wherein, N is the sampling number of the s (n)；

= = 0,1, 2,...,N-1

Wherein, v=L-u, u and V are the sCn) root sequence number, the ^ and () are sCn) used root sequence number u and V expression formula.28th, the method according to any one of claim 19 to 24, it is characterised in that described the sequence d (n) is mapped to corresponding resource location to include：

Sequence d (0) to d (L) is mapped in L+1 continuous equally spaced subcarrier in frequency domain.

29th, the method according to claim 28, it is characterised in that the synchronous baseband signal s is generated using single-carrier frequency division multiple access SC-FDMA method.

30th, method according to claim 29, it is characterised in that the sampled signal s (n) of the baseband signal s has skew centrosymmetric and anti-communism yoke equality；Respectively：

s(n) = -s(N-n),n = \,2,...,N-\

Wherein, Ν is described) sampling number；

s_u(n) = -s_v*(n),n = 0,1,...,Ν -I

Wherein, v=L-u, u and v are the sCn) with sequence number, the ^ and () are sCn) use Root sequence number U and V expression formula.

31st, the method according to claim 19 or 20, it is characterised in that described to utilize sequence b (n) to generate for the sequence d (n) of synchronizing signal to include：

d(n) = b(n),n = 0,1,...,L-l

Wherein, L is even number.

32nd, method according to claim 31, it is characterised in that the sequence b (n) is： b{n) = w¹²Wherein, ^=_e- or ^=Τ;J is imaginary unit；U is the root sequence number of the sequence n)；The u and the L prime number each other.

33rd, the method according to claim 31 or 32, it is characterised in that described the sequence d (n) is mapped to corresponding resource location to include：

Sequence d (0) to d (L-l) is mapped in L continuous equally spaced subcarrier in frequency domain.

34th, the method according to claim 33, it is characterised in that the synchronous baseband signal s is generated using single-carrier frequency division multiple access SC-FDMA method.

35th, the method according to claim 31 or 32, it is characterised in that the synchronous baseband signal s of the generation includes：

The chip of the sequence d (n) is arranged in order in the synchronizing signal for being placed on time domain.

36th, method according to claim 35, it is characterised in that the sampled signal s (n) of the baseband signal s has centre symmetry and conjugation equality；Respectively：

s(n) = s(N -n),n = \,2,...,N -\

Wherein, N is the sampling number of the s (n)；

5„(n) = = 0,1,...,N-1

Wherein, v=2m*L-u, m are integer；U and v is the sO) with sequence number, (n) and () is the expression formula that s (n) has used root sequence number u and V.