CN105812305A - Generating and processing method of pilot frequency sequence in wireless communication system - Google Patents

Abstract

The present application discloses a generating and processing method of a pilot frequency sequence in a wireless communication system. The method comprises a step of generating a pilot frequency sequence for the pilot frequency position in the synchronization frame in an (nPRB)th frequency point according to a cell identification and the absolute frequency point index number of the (nPRB)th frequency point, and a step of mapping the generated pilot frequency sequence to the pilot frequency position corresponding to the synchronization frame in the (nPRB)th frequency point. By using the method, the pilot frequency structure of the resource allocation scheme of a downlink synchronization frame can be correctly matched.

Description

The generation processing method of pilot frequency in wireless communication system sequence

Technical field

The application relates to wireless communication technology field, particularly relates to the generation processing method of a kind of pilot frequency in wireless communication system sequence.

Background technology

In a wireless communication system, OFDM (OFDM) is a kind of particular frequencies multiplex technique utilizing multi-carrier modulation.In traditional Frequency Division Multiplexing system (FDM): whole signal frequency range is divided into N number of frequency subchannels not overlapped each other, each subchannel transmission independence modulation symbol, then more N number of sub-channel is carried out channeling, this method is conducive to eliminating interchannel interference, but can not effectively utilize frequency spectrum resource.OFDM technology can utilize the orthogonality between subcarrier without this section of guard band.Thus saving bandwidth, thus OFDM is higher than the FDM availability of frequency spectrum.The ultimate principle of OFDM, it is simply that high-speed data-flow by serial to parallel conversion, be assigned in some sub-channels that transfer rate is relatively low and be transmitted.Symbol period in so each sub-channels can be elongated, therefore can alleviate the impact that system is caused by multidiameter delay.OFDM adopts the Fourier transform modulation orthogonal based on carrier frequency easily realized, directly in Base-Band Processing.

Fig. 1 is existing a kind of wireless communication system spectrum diagram.Referring to Fig. 1, this wireless communication system takies discontinuous spectral bandwidth, and the physical channel that each frequency domain is 25kHz bandwidth is defined as a frequency, at mostIndividual frequency.Each frequency adopts OFDM technology, and all discontinuous frequencies condense together, and system is done United Dispatching and distributed to user terminal, constitute the communication system with carrier aggregation characteristic.The wireless frame length that this wireless communication system is corresponding on each frequency is 25ms, comprises 45 OFDM symbol.

Fig. 2 is the frequency time interval resource structural representation of described wireless communication system, as in figure 2 it is shown, described downlink resource takies 13 OFDM symbol.

Fig. 3 is described wireless communication system descending pilot frequency scheme schematic diagram, as it is shown on figure 3, have a RE as pilot tone in each OFDM symbol of wherein each frequency, (k, l) according to cell ID in the position of this pilot toneDetermine with OFDM symbol number l.

$k=(v_{\mathrm{shift}}+l)\mathrm{mod}{N}_{\mathrm{sc}}^{\mathrm{RB}}$

$l=\mathrm{0,1},...,N_{\mathrm{Sym}}^{\mathrm{DL}}-1$

Wherein $v_{\mathrm{shift}}=N_{\mathrm{ID}}^{\mathrm{cell}}\mathrm{mod}{N}_{\mathrm{SC}}^{\mathrm{RB}},N_{\mathrm{sc}}^{\mathrm{RB}}=10,N_{\mathrm{Sym}}^{\mathrm{DL}}=13,N_{\mathrm{RB}}^{\mathrm{DL}}=480,N_{\mathrm{ID}}^{\mathrm{cell}}=\mathrm{0,1},...,503$

For each pilot frequency locations in Fig. 3, it is as follows that pilot frequency sequence generates formula:

For the descending pilot frequency scheme of a kind of wireless communication system with carrier aggregation characteristic shown in Fig. 3, the downlink reference signal that each frequency, each radio frames produce is:

$r_l\left(n_{\mathrm{PRB}}\right)=\frac{1}{\sqrt{2}}(1-2\·c\left({2n}_{\mathrm{PRB}}\right))+j\frac{1}{\sqrt{2}}(1-2\·c({2n}_{\mathrm{PRB}}+1))$

Wherein, n_PRBFor frequency index value, spanC (n) is pseudo-random sequence, and the generating mode of c (n) is:

C (n)=(x₁(n+N_C)+x₂(n+N_C))mod2

x₁(n+31)=(x₁(n+3)+x₁(n))mod2

x₂(n+31)=(x₂(n+3)+x₂(n+2)+x₂(n+1)+x₂(n))mod2

Wherein N_C=1600, first m-sequence initialization of register is x₁(0)=1, x₁(n)=0, n=1,2 ..., 30. second m-sequence initialization of register arec_initInitial value is:

$c_{\mathrm{init}}=2^{10}\·(l+1)\·(2\·N_{\mathrm{ID}}^{\mathrm{cell}}+1)+2\·N_{\mathrm{ID}}^{\mathrm{cell}}$

WhereinRepresent the OFDM symbol index in a radio frames.

Reference signal sequence r_l(n_PRB), complex value modulation symbol will be mapped to as followsOn, the downlink reference signal as in a radio frames:

But current pilot sequence generating method is not suitable for the pilot configuration in the Resource Allocation Formula of down-going synchronous frame.Such as Fig. 4 is the schematic diagram of the concrete Resource Allocation Formula of a kind of down-going synchronous frame.Referring to Fig. 4, it is shown that 10 × 13 matrix represent a Resource Block, wherein 10 row represent 10 subcarriers that bandwidth is nominated bandwidth, each column is exactly an OFDM symbol, one has 13 row, and these 13 OFDM symbol represent the downlink resource of described down-going synchronous frame, specifically down time-frequency resource.

Before taking in described down-going synchronous frame, 6 ODFM symbols are as descending heart beating resource, shown in the shaded block in Fig. 3；Take rear 7 ODFM symbols as down-going synchronous resource simultaneously, namely send the resource of downlink synchronous signal, shown in the blank block in Fig. 3.In described descending heart beating resource；The pilot signal of descending heartbeat signal takies first OFDM symbol in described 6 ODFM symbols and last (namely the 6th) OFDM symbol is transmitted.The OFDM symbol that descending heartbeat signal takies between described first OFDM symbol and last OFDM symbol is transmitted, and namely takies described 2nd, 3,4,5 OFDM symbol.

For the pilot configuration of the concrete Resource Allocation Formula of the down-going synchronous frame shown in Fig. 4, existing pilot sequence generating method cannot generate correct pilot frequency sequence, it is impossible to the pilot configuration of the correct concrete Resource Allocation Formula mating described down-going synchronous frame.

Summary of the invention

In view of this, the main purpose of the present invention is to provide the pilot sequence generating method of a kind of wireless communication system, it is possible to correctly mate the pilot configuration of the Resource Allocation Formula of down-going synchronous frame.

The technical scheme is that and be achieved in that:

A kind of generation processing method of pilot frequency in wireless communication system sequence, including:

According to cell ID and n-th_PRBThe absolute frequency call number of individual frequency, for described n-th_PRBPilot frequency locations in synchronization frame on individual frequency generates pilot frequency sequence；

The pilot frequency sequence generated is mapped to described n-th_PRBThe corresponding pilot frequency locations of the synchronization frame on individual frequency.

In an advantageous embodiment, described according to cell ID and n-th_PRBThe absolute frequency call number of individual frequency, for described n-th_PRBPilot frequency locations in synchronization frame on individual frequency generates pilot frequency sequence, specifically includes:

Described pilot frequency sequence is generated according to equation below (1):

$r_{\mathrm{rs}}(k,n_{\mathrm{PRB}})=\frac{1}{\sqrt{2}}(1-2\·c\left(2k\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2k+1))$ Formula (1)

Wherein, k span 0,1 ..., m-1, m is the sub-carrier number of the Resource Block of described synchronization frame, and described c is length is M_PNRandom sequence c (n), described M_PN=m；

Wherein, random sequence c (n), n=0,1 ..., M_PN-1 generates according to equation below (2):

C (n)=(x₁(n+N_C)+x₂(n+N_C)) mod2 formula (2)

In formula (2), described x₁It is first m-sequence depositor, x₁Generate according to equation below (3)；Described x₂It is second m-sequence depositor, x₂Generate according to equation below (4):

x₁(n+31)=(x₁(n+3)+x₁(n)) mod2 formula (3)

x₂(n+31)=(x₂(n+3)+x₂(n+2)+x₂(n+1)+x₂(n)) mod2 formula (4)

Wherein said N_C=1600,

First m-sequence initialization of register is x₁(0)=1, x₁(n)=0, n=1,2 ..., 30,

Second m-sequence initialization of register is

c_initInitial value is: $c_{\mathrm{init}}=2866\·(2*\mathrm{SubBandIndex}+1)\·2^9+N_{\mathrm{ID}}^{\mathrm{cell}};$

Wherein, described SubBandIndex represents described n-th_PRBThe absolute frequency call number of individual frequency,Represent cell ID.

In an advantageous embodiment, described the pilot frequency sequence generated is mapped to described n-th_PRBThe corresponding pilot frequency locations of the synchronization frame on individual frequency, specifically includes:

Described formula (1) is obtained the pilot frequency sequence of m point length, is respectively mapped to described n-th according to identical mapping mode_PRBOn m subcarrier of the pilot frequency locations that synchronization frame on individual frequency is corresponding, concrete mapping mode equation below (5):

$a_{n_{\mathrm{PRB}},k,l}=r_{\mathrm{rs}}(k,n_{\mathrm{PRB}}),k=\mathrm{0,1},...,m-1$ Formula (5)

Wherein l represents the sequence number of the orthogonal frequency division multiplex OFDM symbol at pilot frequency locations place.

In an advantageous embodiment, described m=10.

In an advantageous embodiment, after the described corresponding pilot frequency locations that the pilot frequency sequence generated is mapped to described synchronization frame, the method farther includes: for each frequency, utilize the pilot frequency sequence be mappeding in described synchronization frame pilot frequency locations, generate the time domain continuous signal that this frequency is launched in the OFDM symbol that described synchronization frame is corresponding on single antenna port, and launch described time domain continuous signal.

In an advantageous embodiment, described utilization be mapped to the pilot frequency sequence in described synchronization frame pilot frequency locations, generates the time domain continuous signal that this frequency is launched in the OFDM symbol that described synchronization frame is corresponding on single antenna port, specifically includes:

Utilize equation below (6), it is determined that the time domain continuous signal that this frequency is launched on single antenna port in the OFDM symbol that described synchronization frame is corresponding

Formula (6)

Wherein: n_PRBFor the sequence number of this frequency,

L is the sequence number of the OFDM symbol that described synchronization frame is corresponding,

0≤t<(N_cp,l+N)×T_s,

N_cp,lFor the length of the cyclic prefix CP of described l OFDM symbol,

N=64,For sampling interval, f_sFor baseband sampling rate；

Number of subcarriers for a Resource Block of described synchronization frame；

△ f=2kHz.

In an advantageous embodiment, the described time domain continuous signal of described transmitting, specifically include:

N-th_PRBThe OFDM symbol in synchronization frame on individual frequency starts according to the l sequential transmission being incremented by from l=0, and the OFDM symbol of l in subframe > 0 is in the momentStart to launch.

In an advantageous embodiment, downlink resource in described synchronization frame includes 13 ODFM symbols, wherein take front 6 ODFM symbols as descending heart beating resource, taking rear 7 ODFM symbols as down-going synchronous resource, the time that the time that wherein said front 6 ODFM symbols take takies with described rear 7 ODFM symbols is identical.

In an advantageous embodiment, in described front 6 ODFM symbols, before each OFDM symbol, there are 13 dot cycle prefixes；In described rear 7 ODFM symbols, there are 15 dot cycle prefixes before first OFDM symbol, all without Cyclic Prefix before rear 6 ODFM symbols.

In an advantageous embodiment, described utilize described descending heart beating resource to user terminal send descending heartbeat signal, specifically include:

The pilot signal of descending heartbeat signal takies first OFDM symbol in described 6 ODFM symbols and last OFDM symbol is transmitted, and the OFDM symbol that descending heartbeat signal takies between described first OFDM symbol and last OFDM symbol is transmitted.

Compared with prior art, the present invention is according to cell ID and n-th_PRBThe absolute frequency call number of individual frequency, for described n-th_PRBPilot frequency locations in synchronization frame on individual frequency generates pilot frequency sequence；The pilot frequency sequence generated is mapped to described n-th_PRBThe corresponding pilot frequency locations of the synchronization frame on individual frequency, such that it is able to correctly mate the pilot configuration of the Resource Allocation Formula of down-going synchronous frame.Especially the pilot configuration of the Resource Allocation Formula of the down-going synchronous frame of the wireless communication system with carrier aggregation characteristic can correctly be mated.

Accompanying drawing explanation

Fig. 1 is existing a kind of wireless communication system spectrum diagram；

Fig. 2 is the frequency time interval resource structural representation of described wireless communication system；

Fig. 3 is described wireless communication system descending pilot frequency scheme schematic diagram；

Fig. 4 is the schematic diagram of the concrete Resource Allocation Formula of a kind of down-going synchronous frame；

Fig. 5 is the process chart of the generation processing method of pilot frequency in wireless communication system sequence of the present invention.

Detailed description of the invention

Below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.

Fig. 5 is the process chart of the generation processing method of pilot frequency in wireless communication system sequence of the present invention.Referring to Fig. 5, the method includes:

Step 501, according to cell ID and n-th_PRBThe absolute frequency call number of individual frequency, for described n-th_PRBPilot frequency locations in synchronization frame on individual frequency generates pilot frequency sequence；

Step 502, the pilot frequency sequence generated is mapped to described n-th_PRBThe corresponding pilot frequency locations of the synchronization frame on individual frequency.

In a preferred embodiment of the present invention, think that the Resource Allocation Formula of synchronization frame described in Fig. 4 is that example introduces pilot frequency sequence of the present invention generation processing method.In the present embodiment, the PN code that pilot frequency sequence adopts length to be m.Described PN code is 0 and 1 coded sequence constituted with the automatic correlative property similar with white noise.Described m is the sub-carrier number of the Resource Block of described synchronization frame, for instance if being applicable to the Resource Block of the synchronization frame shown in Fig. 4, then m=10.

As shown in Figure 4, the matrix of 10 × 13 shown in this Fig. 4 represents a Resource Block, wherein 10 row represent 10 subcarriers that bandwidth is nominated bandwidth, each column is exactly an OFDM symbol, one has 13 row, these 13 OFDM symbol represent the downlink resource of described down-going synchronous frame, specifically down time-frequency resource.Wherein the time shared by front 6 OFDM symbol (dash area in figure) is identical with the time shared by rear 7 OFDM symbol.It is commonly referred to as resource particle (Resourceelement) as each cell in Resource Block.When information is transmitted, it is necessary to these resource particle are modulated (QAM) respectively, carry out IFFT conversion after carrying out serial to parallel conversion, then carry out parallel serial conversion, after adding Cyclic Prefix (CP), be the formation of OFDM data stream.

The Cyclic Prefix (CP) of described OFDM is exactly replicate a part for OFDM symbol afterbody to be put into before OFDM, and the effect of CP is to eliminate symbol-interference (ISI) and interchannel interference (ICI).

In the present invention, as shown in Figure 4, the downlink resource in described down-going synchronous frame includes 13 ODFM symbols, and before taking in described down-going synchronous frame, 6 ODFM symbols are as descending heart beating resource, shown in the shaded block in Fig. 4；Take rear 7 ODFM symbols as down-going synchronous resource simultaneously, namely send the resource of downlink synchronous signal, shown in the blank block in Fig. 4.In described descending heart beating resource；The pilot signal of descending heartbeat signal takies first OFDM symbol in described 6 ODFM symbols and last (namely the 6th) OFDM symbol is transmitted, in 1st and the 6th OFDM symbol, before each OFDM symbol, there are 13 dot cycle prefixes (CP).The OFDM symbol that descending heartbeat signal takies between described first OFDM symbol and last OFDM symbol is transmitted, and namely takies described 2nd, 3,4,5 OFDM symbol, has 13 CP before each OFDM symbol.As it is shown on figure 3, in described rear 7 ODFM symbols shared by downlink synchronous signal, have 15 dot cycle prefixes before first OFDM symbol, all without Cyclic Prefix before rear 6 ODFM symbols.

In an advantageous embodiment, in step 501, described according to cell ID and n-th_PRBThe absolute frequency call number of individual frequency, for described n-th_PRBPilot frequency locations in synchronization frame on individual frequency generates pilot frequency sequence, and its concrete generating mode is:

Described pilot frequency sequence is generated according to equation below (1):

$r_{\mathrm{rs}}(k,n_{\mathrm{PRB}})=\frac{1}{\sqrt{2}}(1-2\&CenterDot;c\left(2k\right))+j\frac{1}{\sqrt{2}}(1-2\&CenterDot;c(2k+1))$ Formula (1)

Wherein, k span 0,1 ..., m-1, m is the sub-carrier number of the Resource Block of described synchronization frame, and described c is length is M_PNRandom sequence c (n), described M_PN=m；

Wherein, random sequence c (n), n=0,1 ..., M_PN-1 generates according to equation below (2):

C (n)=(x₁(n+N_C)+x₂(n+N_C)) mod2 formula (2)

In formula (2), described x₁It is first m-sequence depositor, x₁Generate according to equation below (3)；Described x₂It is second m-sequence depositor, x₂Generate according to equation below (4):

x₁(n+31)=(x₁(n+3)+x₁(n)) mod2 formula (3)

x₂(n+31)=(x₂(n+3)+x₂(n+2)+x₂(n+1)+x₂(n)) mod2 formula (4)

Wherein said N_C=1600,

First m-sequence initialization of register is x₁(0)=1, x₁(n)=0, n=1,2 ..., 30,

Second m-sequence initialization of register is

c_initInitial value is: $c_{\mathrm{init}}=2866\&CenterDot;(2*\mathrm{SubBandIndex}+1)\&CenterDot;2^9+N_{\mathrm{ID}}^{\mathrm{cell}};$

Wherein, described SubBandIndex represents described n-th_PRBThe absolute frequency call number of individual frequency,Represent cell ID.

In described step 502, described the pilot frequency sequence generated is mapped to described n-th_PRBThe corresponding pilot frequency locations of the synchronization frame on individual frequency, specifically includes:

Described formula (1) is obtained the pilot frequency sequence of m point length, is respectively mapped to described n-th according to identical mapping mode_PRBOn m subcarrier of the pilot frequency locations that synchronization frame on individual frequency is corresponding, concrete mapping mode equation below (5):

$a_{n_{\mathrm{PRB}},k,l}=r_{\mathrm{rs}}(k,n_{\mathrm{PRB}}),k=\mathrm{0,1},...,m-1$ Formula (5)

Wherein l represents the sequence number of the orthogonal frequency division multiplex OFDM symbol at pilot frequency locations place.

Such as the pilot frequency locations of synchronization frame as shown in Figure 4, utilizing described formula (1) to obtain the pilot frequency sequence of 10 length, be respectively mapped on 10 subcarriers of 2 OFDM symbol according to identical mapping mode, concrete mapping mode is as follows:

$a_{n_{\mathrm{PRB}},k,l}=r_{\mathrm{rs}}(k,n_{\mathrm{PRB}}),k=\mathrm{0,1},...,9,l=\mathrm{1,6}$

Wherein l=1,6 represent the pilot frequency locations at pilot signal place respectively, namely in the 1st OFDM symbol and the 6th OFDM symbol.In the scene shown in Fig. 4, described m=10, the PN code that namely described pilot frequency sequence adopts length to be 10.

In the further embodiment of the method for the invention, after the described corresponding pilot frequency locations that the pilot frequency sequence generated is mapped to described synchronization frame, the method farther includes subsequent step 503:

Step 503, for each frequency, utilize the pilot frequency sequence be mappeding in described synchronization frame pilot frequency locations, generate the time domain continuous signal that this frequency is launched in the OFDM symbol that described synchronization frame is corresponding on single antenna port, and launch described time domain continuous signal.

In described step 503, described utilization be mapped to the pilot frequency sequence in described synchronization frame pilot frequency locations, generates the time domain continuous signal that this frequency is launched in the OFDM symbol that described synchronization frame is corresponding on single antenna port, specifically includes:

Utilize equation below (6), it is determined that the time domain continuous signal that this frequency is launched on single antenna port in the OFDM symbol that described synchronization frame is corresponding

Formula (6)

Wherein: n_PRBFor the sequence number of this frequency,

L is the sequence number of the OFDM symbol that described synchronization frame is corresponding, and for the Resource Allocation Formula of synchronization frame as shown in Figure 4, described l is 0 and 5；

0≤t<(N_cp,l+N)×T_s,

N_cp,lFor the length of the cyclic prefix CP of described l OFDM symbol,

N=64,For sampling interval, f_sFor baseband sampling rate；More specifically, f_s=128kHz；

Number of subcarriers for a Resource Block of described synchronization frame, for instance for the Resource Allocation Formula of the synchronization frame shown in Fig. 4, should

△ f=2kHz.

The described time domain continuous signal of described transmitting, specifically includes: n-th_PRBThe OFDM symbol in synchronization frame on individual frequency starts according to the l sequential transmission being incremented by from l=0, and the OFDM symbol of l in subframe > 0 is in the momentStart to launch.

For the Resource Allocation Formula of synchronization frame as shown in Figure 4, OFDM symbol different in described synchronization frame has different circulating prefix-lengths, is given by:

The generation processing method of the pilot frequency sequence of synchronization frame of the present invention, it is particularly possible to be applicable to the wireless communication system with carrier aggregation characteristic.The present invention can pass through in the wireless communication system with carrier aggregation characteristic as frequency n_PRBOn synchronization frame in pilot frequency locations generate different pilot frequency sequence, to meet system design considerations.

It addition, each embodiment of the present invention can be realized by the data processor performed by data handling equipment such as computer.Obviously, data processor constitutes the present invention.Additionally, the data processor being generally stored inside in a storage medium by directly reading out storage medium or performing by program being installed or copied in the storage device (such as hard disk and or internal memory) of data handling equipment by program.Therefore, such storage medium also constitutes the present invention.Storage medium can use any kind of recording mode, for instance paper storage medium (such as paper tape etc.), magnetic storage medium (such as floppy disk, hard disk, flash memory etc.), optical storage media (such as CD-ROM etc.), magnetic-optical storage medium (such as MO etc.) etc..

Therefore the invention also discloses a kind of storage medium, wherein storage has data processor, and this data processor is for performing any embodiment of said method of the present invention.

Additionally, method step of the present invention is except realizing with data processor, can also be realized by hardware, for instance, it is possible to realized by gate, switch, special IC (ASIC), programmable logic controller (PLC) and embedding microcontroller etc..Therefore this hardware that can realize the method for the invention can also constitute the present invention.

The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within the scope of protection of the invention.

Claims (10)

1. the generation processing method of a pilot frequency in wireless communication system sequence, it is characterised in that including:

According to cell ID and n-th_PRBThe absolute frequency call number of individual frequency, for described n-th_PRBPilot frequency locations in synchronization frame on individual frequency generates pilot frequency sequence；

The pilot frequency sequence generated is mapped to described n-th_PRBThe corresponding pilot frequency locations of the synchronization frame on individual frequency.

2. method according to claim 1, it is characterised in that described according to cell ID and n-th_PRBThe absolute frequency call number of individual frequency, for described n-th_PRBPilot frequency locations in synchronization frame on individual frequency generates pilot frequency sequence, specifically includes:

Described pilot frequency sequence is generated according to equation below (1):

$r_{\mathrm{rs}}(k,n_{\mathrm{PRB}})=\frac{1}{\sqrt{2}}(1-2\&CenterDot;c\left(2k\right))+j\frac{1}{\sqrt{2}}(1-2\&CenterDot;c(2k+1))$ Formula (1)

Wherein, k span 0,1 ..., m-1, m is the sub-carrier number of the Resource Block of described synchronization frame, and described c is length is M_PNRandom sequence c (n), described M_PN=m；

Wherein, random sequence c (n), n=0,1 ..., M_PN-1 generates according to equation below (2):

C (n)=(x₁(n+N_C)+x₂(n+N_C)) mod2 formula (2)

In formula (2), described x₁It is first m-sequence depositor, x₁Generate according to equation below (3)；Described x₂It is second m-sequence depositor, x₂Generate according to equation below (4):

x₁(n+31)=(x₁(n+3)+x₁(n)) mod2 formula (3)

x₂(n+31)=(x₂(n+3)+x₂(n+2)+x₂(n+1)+x₂(n)) mod2 formula (4)

Wherein said N_C=1600,

First m-sequence initialization of register is x₁(0)=1, x₁(n)=0, n=1,2 ..., 30,

Second m-sequence initialization of register is

c_initInitial value is: $c_{\mathrm{init}}=2866\&CenterDot;(2*\mathrm{SubBanIndex}+1)\&CenterDot;2^9+N_{\mathrm{ID}}^{\mathrm{ecll}};$

Wherein, described SubBandIndex represents described n-th_PRBThe absolute frequency call number of individual frequency,Represent cell ID.

3. method according to claim 2, it is characterised in that described the pilot frequency sequence generated is mapped to described n-th_PRBThe corresponding pilot frequency locations of the synchronization frame on individual frequency, specifically includes:

Described formula (1) is obtained the pilot frequency sequence of m point length, is respectively mapped to described n-th according to identical mapping mode_PRBOn m subcarrier of the pilot frequency locations that synchronization frame on individual frequency is corresponding, concrete mapping mode equation below (5):

$a_{n_{\mathrm{PRB}},k,l}=r_{\mathrm{rs}}(k,n_{\mathrm{PRB}}),k=\mathrm{0,1},\&CenterDot;\&CenterDot;\&CenterDot;,m-1$ Formula (5)

Wherein l represents the sequence number of the orthogonal frequency division multiplex OFDM symbol at pilot frequency locations place.

4. method according to claim 3, it is characterised in that described m=10.

5. method according to claim 1, it is characterised in that after the described corresponding pilot frequency locations that the pilot frequency sequence generated is mapped to described synchronization frame, the method farther includes:

For each frequency, utilize the pilot frequency sequence be mappeding in described synchronization frame pilot frequency locations, generate the time domain continuous signal that this frequency is launched in the OFDM symbol that described synchronization frame is corresponding on single antenna port, and launch described time domain continuous signal.

6. method according to claim 5, it is characterized in that, described utilization be mapped to the pilot frequency sequence in described synchronization frame pilot frequency locations, generates the time domain continuous signal that this frequency is launched in the OFDM symbol that described synchronization frame is corresponding on single antenna port, specifically includes:

Utilize equation below (6), it is determined that the time domain continuous signal that this frequency is launched on single antenna port in the OFDM symbol that described synchronization frame is corresponding

Formula (6)

Wherein: n_PRBFor the sequence number of this frequency,

L is the sequence number of the OFDM symbol that described synchronization frame is corresponding,

0≤t<(N_cp,l+N)×T_s,

N_cp,lFor the length of the cyclic prefix CP of described l OFDM symbol,

N=64,For sampling interval, f_sFor baseband sampling rate；

Number of subcarriers for a Resource Block of described synchronization frame；

Δ f=2kHz.

7. method according to claim 6, it is characterised in that the described time domain continuous signal of described transmitting, specifically includes:

N-th_PRBThe OFDM symbol in synchronization frame on individual frequency starts according to the l sequential transmission being incremented by from l=0, and the OFDM symbol of l in subframe > 0 is in the moment(N_CP,l′+N)T_sStart to launch.

8. the method according to any one of claim 1-7, it is characterized in that, downlink resource in described synchronization frame includes 13 ODFM symbols, wherein take front 6 ODFM symbols as descending heart beating resource, taking rear 7 ODFM symbols as down-going synchronous resource, the time that the time that wherein said front 6 ODFM symbols take takies with described rear 7 ODFM symbols is identical.

9. method according to claim 8, it is characterised in that

In described front 6 ODFM symbols, before each OFDM symbol, there are 13 dot cycle prefixes；

In described rear 7 ODFM symbols, there are 15 dot cycle prefixes before first OFDM symbol, all without Cyclic Prefix before rear 6 ODFM symbols.

10. method according to claim 9, it is characterised in that described utilize described descending heart beating resource to user terminal send descending heartbeat signal, specifically include:

The pilot signal of descending heartbeat signal takies first OFDM symbol in described 6 ODFM symbols and last OFDM symbol is transmitted, and the OFDM symbol that descending heartbeat signal takies between described first OFDM symbol and last OFDM symbol is transmitted.