CN103037411B - LTE system secondary synchronization code detection method and device - Google Patents

Abstract

The invention provides a kind of LTE system secondary synchronization code detection method and device, wherein, described method comprises: the auxiliary synchronous signals receiving time domain, and converts frequency-region signal to and carry out carrier wave rearrangement; Deinterleaving and scramble process are carried out to aforesaid result, to obtain one group of correlated series 0 and eight groups of correlated serieses 1; Circular correlation is carried out to aforesaid result, to obtain correlation; From the correlation of described one group of correlated series 0, choose multiple correlation and obtain the multiple 0 sequence index values corresponding with the plurality of correlation, from the correlation of described eight groups of correlated serieses 1, choose multiple correlation and obtain the multiple 1 sequence index values corresponding with the plurality of correlation; Described multiple 0 sequence index value and multiple 1 sequence index value are formed multiple index pair, and to the plurality of index to judging, chooses multiple indexes pair wherein; According to the multiple indexes pair chosen, to obtain multiple cell group number, thus improve cell detection efficiency.

Description

LTE system secondary synchronization code detection method and device

Technical field

The present invention relates to mobile communication technology field, particularly a kind of LTE system secondary synchronization code detection method and device.

Background technology

In order to tackle the rapid emergence of Worldwide Interoperability for Microwave access interoperability (WiMAX) technology, 3GPP will start Long Term Evolution (LTE) plan of universal mobile telecommunications system (UMTS) technology in the end of the year 2004.This plan object introduces the wireless air interface in the whole world and the technology of various advanced person, to reach larger transmission rate, less access delay and larger power system capacity.According to current LTE standard, the peak rate of system descending maximum support 300Mbps, the peak rate of up maximum support 75Mbps.

In the cell search process of LTE system, need to detect secondary synchronization code (SecondarySynchronizationCode, SSC) realize synchronously.LTE system has TDD (time division duplex) and FDD (Frequency Division Duplexing (FDD)) two kinds of patterns, and for the detection method of SSC, two kinds of patterns are identical.For sake of convenience, the detection method of SSC is described according to tdd mode below.

Known SSC is defined as follows:

$d\left(2n\right)=\left\{\begin{array}{ccc}{s}_0^{\left(m_0\right)}\left(n\right)c_0\left(n\right)& \mathrm{in}& \mathrm{subframe}0\\ s_1^{\left(m_1\right)}\left(n\right)c_0\left(n\right)& \mathrm{in}& \mathrm{subframe}5\end{array}\right.$

$d(2n+1)=\left\{\begin{array}{ccc}{s}_1^{\left(m_1\right)}\left(n\right)c_1\left(n\right)z_1^{\left(m_0\right)}\left(n\right)& \mathrm{in}& \mathrm{subframe}0\\ s_0^{\left(m_0\right)}\left(n\right)c_1\left(n\right)z_1^{\left(m_1\right)}\left(n\right)& \mathrm{in}& \mathrm{subframe}5\end{array}\right.$

Wherein 0≤n≤30, m ₀and m ₁by cell ID group number generate:

m ₀＝m′mod31

Sequence with corresponding to m sequence two different cyclic shifts:

$s_0^{\left(m_0\right)}\left(n\right)=\tilde{s}\left((n+m_0)\mathrm{mod}31\right)$

$s_1^{\left(m_1\right)}\left(n\right)=\tilde{s}\left((n+m_1)\mathrm{mod}31\right)$

Wherein $\tilde{s}\left(i\right)=1-2x\left(i\right),0\≤i\≤30$ Be defined as follows:

$x(\stackrel{\‾}{i}+5)=(x(\stackrel{\‾}{i}+2)+x\left(\stackrel{\‾}{i}\right))\mathrm{mod}\mathrm{2,0}\≤\stackrel{\‾}{i}\≤25$

Initial condition is x (0)=0, x (1)=0, x (2)=0, x (3)=0, x (4)=1.

C ₀(n) and c ₁n () is two scramble sequence, be m sequence different cyclic shifts, shift value depends on P-SCH, also namely depends on numbering in cell ID group

$c_0\left(n\right)=\tilde{c}\left((n+N_{\mathrm{ID}}^{\left(2\right)})\mathrm{mod}31\right)$

$c_1\left(n\right)=\tilde{c}\left((n+N_{\mathrm{ID}}^{\left(2\right)}+3)\mathrm{mod}31\right)$

Wherein $\tilde{c}\left(i\right)=1-2x\left(i\right),0\≤i\≤30$ Be defined as follows:

$x(\stackrel{\‾}{i}+5)=(x(\stackrel{\‾}{i}+3)+x\left(\stackrel{\‾}{i}\right))\mathrm{mod}\mathrm{2,0}\≤\stackrel{\‾}{i}\≤25$

Initial condition is x (0)=0, x (1)=0, x (2)=0, x (3)=0, x (4)=1.

with also be scrambler sequence, by m sequence cyclic shift generates:

$z_1^{\left(m_0\right)}\left(n\right)=\tilde{z}\left((n+\left(m_0\mathrm{mod}8\right))\mathrm{mod}31\right)$

$z_1^{\left(m_1\right)}\left(n\right)=\tilde{z}\left((n+\left(m_1\mathrm{mod}8\right))\mathrm{mod}31\right)$

Wherein $\tilde{z}\left(i\right)=1-2x\left(i\right),0\≤i\≤30$ Be defined as follows:

$x(\stackrel{\‾}{i}+5)=(x(\stackrel{\‾}{i}+4)+x(\stackrel{\‾}{i}+2)+x(\stackrel{\‾}{i}+1)+x\left(\stackrel{\‾}{i}\right))\mathrm{mod}\mathrm{2,0}\≤\stackrel{\‾}{i}\≤25$

Initial condition is x (0)=0, x (1)=0, x (2)=0, x (3)=0, x (4)=1.

The position of SSC is located below from the angle of time domain and frequency domain.In time domain, SSC is positioned at last OFDM symbol of subframe 0 and 5 (numbering from 0), the dash area as shown in Figure 1 of the position on frame structure, because the SSC in subframe 0 with 5 is not identical, therefore can be used for the timing of 10ms frame.

On frequency domain, the bandwidth of cell of system support has six type such as 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and 20MHz, the least unit of frequency domain is RB (Resource Block), and each RB comprises 12 subcarriers, and each subcarrier takies the bandwidth of 15kHz.No matter the bandwidth of community is much, and SSC is distributed in 62 subcarriers on 6 RB of center frequency point both sides on frequency domain, and remaining 10 sub-distribution of carriers are at two ends as protection interval, and the distribution on frequency domain as shown in Figure 2.

The secondary synchronization code of LTE system detects the good correlation that make use of m sequence, determines cell group number by the position of correlation peak in cell search process, in real environment, always there is multiple community simultaneously.In order to measurement and the mobility of support terminal equipment, terminal is just needed to detect the information of all adjacent cells except this community accurately.Application number be 200910198610.6, publication number is the secondary synchronization code detection technique disclosing a kind of LTE system in the Chinese patent application " secondary synchronization sequence detection method of long evolving system and device " of 102055698A, but in this patent application secondary synchronization code detection algorithm one-time detection process in, can only export one prominent value.Upon completion of the assays, need this corresponding cell signal could detect the next cell information existed after eliminating, namely cell detection efficiency is not high.

Summary of the invention

The object of the present invention is to provide a kind of LTE system secondary synchronization code detection method and device, a prominent cell group number can only be exported to solve one-time detection in prior art value, thus the problem that cell detection efficiency is not high.

For solving the problems of the technologies described above, the invention provides a kind of LTE system secondary synchronization code detection method, comprising: step 10: the auxiliary synchronous signals receiving time domain, and convert frequency-region signal to and carry out carrier wave rearrangement; Step 20: carry out deinterleaving and scramble process to the result of step 10, to obtain one group of correlated series 0 and eight groups of correlated serieses 1; Step 30: carry out circular correlation to the result of step 20, with the correlation of the correlation and eight groups of correlated serieses 1 that obtain one group of correlated series 0; Step 40: choose multiple correlation and obtain the multiple 0 sequence index values corresponding with the plurality of correlation from the correlation of described one group of correlated series 0, chooses multiple correlation and obtains the multiple 1 sequence index values corresponding with the plurality of correlation from the correlation of described eight groups of correlated serieses 1; Step 50: described multiple 0 sequence index value and multiple 1 sequence index value are formed multiple index pair, and to the plurality of index to judging, chooses multiple indexes pair wherein; Step 60: according to the multiple indexes pair chosen, obtain multiple cell group number.

Optionally, in described LTE system secondary synchronization code detection method, described step 40 comprises the steps: step 41: from the correlation of one group of correlated series 0 of even subframe, choose maximum N ₁individual correlation also obtains and this N ₁the N that individual correlation is corresponding ₁individual 0 sequence index value; Step 42: to described N ₁individual 0 sequence index value is carried out mould 8 and is processed, and according to the result after the process of this mould 8, from eight groups of correlated serieses 1 of even subframe, chooses corresponding group; Step 43: choose maximum M in the correlation of the described corresponding group chosen ₁individual correlation also obtains and this M ₁the M that individual correlation is corresponding ₁individual 1 sequence index value; Wherein, described N ₁, M ₁for natural number.

Optionally, in described LTE system secondary synchronization code detection method, described step 40 also comprises the steps: step 44: from the correlation of one group of correlated series 0 of odd numbered sub-frames, choose maximum N ₂individual correlation also obtains and this N ₂the N that individual correlation is corresponding ₂individual 0 sequence index value; Step 45: to described N ₂individual 0 sequence index value is carried out mould 8 and is processed, and according to the result after the process of this mould 8, from eight groups of correlated serieses 1 of odd numbered sub-frames, chooses corresponding group; Step 46: choose maximum M in the correlation of the described corresponding group chosen ₂individual correlation also obtains and this M ₂the M that individual correlation is corresponding ₂individual 1 sequence index value; Wherein, described N ₂, M ₂for natural number.

Optionally, in described LTE system secondary synchronization code detection method, described step 50 comprises the steps: step 51: by described N ₁individual 0 sequence index value and M ₁individual 1 sequence index value composition P ₁individual index pair; Step 52: by described N ₂individual 0 sequence index value and M ₂individual 1 sequence index value composition P ₂individual index pair; Step 53: to the index formed in above-mentioned steps to judging, choose Q ₁individual index pair; Wherein, P ₁, P ₂, Q ₁for natural number.

Optionally, in described LTE system secondary synchronization code detection method, also step 521 is comprised after the step 52: to P ₁individual index to and P ₂individual index to carrying out merger process, to remove of two identical index centerings.

Optionally, in described LTE system secondary synchronization code detection method, when two indexes are to time identical, by these two indexes to corresponding correlation be added, and using be added after correlation as retain index to corresponding correlation.

Optionally, in described LTE system secondary synchronization code detection method, described step 53 comprises the steps: step 531: the corresponding relation determining even subframe, odd numbered sub-frames and subframe 0, subframe 5; Step 532: according to the characteristic of subframe 0 with subframe 5, remove invalid index pair; Step 533: remaining index centering, choose the Q that correlation is maximum ₁individual index pair.

Optionally, in described LTE system secondary synchronization code detection method, described step 60 comprises the steps: step 61: choose value that index centering is less is assigned to m ₀, larger value is assigned to m ₁; Step 62: according to formula

m'＝31(m ₁-m ₀-1)+m ₀

$N_{\mathrm{ID}}^{\left(1\right)}=m^{\′}-q(q+1)/2$

Calculate cell group number; Step 63: repeated execution of steps 61 and step 62, thus according to the multiple indexes pair chosen, to obtain multiple cell group number.

The present invention also provides a kind of device realizing above-mentioned LTE system secondary synchronization code detection method, comprising: frequency domain conversion and carrier wave reordering module, in order to receive the auxiliary synchronous signals of time domain, and convert frequency-region signal to and carry out carrier wave rearrangement; Deinterleaving and descrambling module, in order to carry out deinterleaving and scramble process, to obtain one group of correlated series 0 and eight groups of correlated serieses 1 to the output of frequency domain conversion and carrier wave reordering module; Correlation module, in order to carry out circular correlation to the output of deinterleaving and descrambling module, with the correlation of the correlation and eight groups of correlated serieses 1 that obtain one group of correlated series 0; Index value chooses module, in order to choose multiple correlation in the correlation of one group of correlated series 0 that exports from correlation module and to obtain the multiple 0 sequence index values corresponding with the plurality of correlation, choose multiple correlation in the correlation of eight groups of correlated serieses 1 and obtain the multiple 1 sequence index values corresponding with the plurality of correlation; Described multiple 0 sequence index value and multiple 1 sequence index value, to choosing module, are formed multiple index pair in order to the output choosing module according to index value, and to the plurality of index to judging, choose multiple index pair by index; Cell group number computing module, in order to according to index to choose module export the multiple indexes pair be selected, calculation plot group #, to obtain multiple cell group number.

In LTE system secondary synchronization code detection method provided by the invention and device, multiple cell group number can be obtained, thus improve cell detection efficiency.

Accompanying drawing explanation

Fig. 1 is the position of SSC in time domain;

Fig. 2 is the position of SSC on frequency domain;

Fig. 3 is the schematic flow sheet of the LTE system secondary synchronization code detection method of the embodiment of the present invention one;

Fig. 4 is the frame schematic diagram of the LTE system secondary synchronization code checkout gear of the embodiment of the present invention two.

Embodiment

Below in conjunction with the drawings and specific embodiments, LTE system secondary synchronization code detection method provided by the invention and device are described in further detail.According to the following describes and claims, advantages and features of the invention will be clearer.It should be noted that, accompanying drawing all adopts the form simplified very much, only in order to object that is convenient, the aid illustration embodiment of the present invention lucidly.

Present embodiments describe the SSC detection technique in LTE system, LTE system has TDD and FDD two kinds of patterns, and for the detection method of SSC, two kinds of patterns are identical.For simplicity's sake, if not specified otherwise, following embodiment describes according to tdd mode.In addition, the present invention be application number be 200910198610.6, the technical scheme of further improvement that the basis of the publication number Chinese patent application " secondary synchronization sequence detection method of long evolving system and device " that is 102055698A proposes, the content of the relevant prior art do not described in detail in the present invention, can with reference to the Chinese patent application of the disclosure.

Embodiment one

Please refer to Fig. 3, it is the schematic flow sheet of the LTE system secondary synchronization code detection method of the embodiment of the present invention one.As shown in Figure 3, LTE system secondary synchronization code detection method specifically comprises the steps:

Step 10: the auxiliary synchronous signals receiving time domain, and convert frequency-region signal to and carry out carrier wave rearrangement.

Step 20: carry out deinterleaving and scramble process to the result of step 10, to obtain one group of correlated series 0 and eight groups of correlated serieses 1.

Step 30: carry out circular correlation to the result of step 20, with the correlation of the correlation and eight groups of correlated serieses 1 that obtain one group of correlated series 0.

Wherein, step 10, step 20 and step 30 are prior art, and the application repeats no more this.

Step 40: choose multiple correlation and obtain the multiple 0 sequence index values corresponding with the plurality of correlation from the correlation of described one group of correlated series 0, chooses multiple correlation and obtains the multiple 1 sequence index values corresponding with the plurality of correlation from the correlation of described eight groups of correlated serieses 1.

In the present embodiment, described one group of correlated series 0 is divided into one group of correlated series 0 of even subframe and one group of correlated series 0 of odd numbered sub-frames; Described eight groups of correlated serieses 1 are divided into one group of correlated series 1 of even subframe and one group of correlated series 1 of odd numbered sub-frames, at this, the position of the frame residing for auxiliary synchronous signals that described even subframe and odd numbered sub-frames finger are received is even subframe position or odd numbered sub-frames position.

Concrete, first, from the correlation of one group of correlated series 0 of even subframe, choose maximum N ₁individual correlation also obtains and this N ₁the N that individual correlation is corresponding ₁individual 0 sequence index value.Such as: first three the maximum correlation choosing the correlated series 0 of even subframe, meanwhile, obtain three the 0 sequence index values corresponding with these three correlations, be expressed as:

η _0,even(0),η _0,even(1),η _0,even(2)

ξ _0,even(0),ξ _0,even(1),ξ _0,even(2)

Wherein, correlation is obtained by circular correlation in the step 30 of the present embodiment, and while obtaining correlation, just can obtain the index value corresponding with this correlation, correlation and index value be retrieved as prior art, those skilled in the art can be obtained by prior art.

After the 0 sequence index value obtaining correlated series 0, determine correlated series 1 corresponding with it according to this 0 sequence index value, namely from eight groups of correlated serieses 1, choose one group of correlated series 1.According to known to introducing of SSC definition in background technology, process by carrying out mould 8 to 0 sequence index value of correlated series 0, just can determine the correlated series 1 corresponding with this 0 sequence index value.On the aforementioned basis choosing three correlations and index value, can be expressed as the determination of correlated series 1:

group(i)＝mod(ξ _0,even(i),8),i＝0,1,2

Then, in the correlation of selected corresponding group, maximum M is chosen ₁individual correlation also obtains and this M ₁the M that individual correlation is corresponding ₁individual 1 sequence index value.In the present embodiment, in the group that each is corresponding, choose a maximum correlation, owing to have chosen three groups, thus three 1 sequence index values can be obtained.Specifically be expressed as:

η _1,even(0),η _1,even(1),η _1,even(2)

ξ _1,even(0),ξ _1,even(1),ξ _1,even(2)

Wherein, the acquisition methods of each correlation and index value is as follows:

Order and select corresponding index value ξ _{1, even}(0).Selection will after completing in element set to 0.

Order and select corresponding index value ξ _{1, even}(1).Selection will after completing in element set to 0.

Order and select corresponding index value ξ _{1, even}(2).

It should be noted that, first, in the present embodiment, in the corresponding correlated series 1 that often group is chosen, choose a maximum correlation, and obtain 1 sequence index value corresponding to this correlation, in other embodiments of the invention, multiple correlation can be obtained, such as: choose maximum first three correlation etc. in the corresponding correlated series 1 that often group is chosen.

Secondly, because choosing of often organizing is undertaken by mould 8 operation of 0 sequence index value, thus, likely there is group (0), group (1), group (2) points to the situation of same group, such as: 0 sequence index value is respectively 7, 15, 23, then, group (0) will be caused thus, group (1), group (2) points to same group, therefore, in the present embodiment, in order to ensure subsequent group, correlation such as selected by group (1) is different from the correlation selected by group (0), improve the validity that correlation is chosen, after group (0) have chosen maximum related value, this correlation is set to 0, namely make this correlation minimum, thus the follow-up problem that gravity treatment just can not occur.In addition, because group (2) is last group in the present embodiment, therefore, just can save after selecting index value, the step that this index value is set to 0 in former group.In other embodiments of the invention, also can not do this step validity to ensure.

By said method, multiple index values of multiple index value of the correlated series 0 of even subframe and the correlated series 1 of even subframe just can be selected.

Utilize identical method, also optional go out multiple index value of correlated series 0 of odd numbered sub-frames and multiple index values of the correlated series 1 of odd numbered sub-frames.

In the present embodiment, select first three maximum correlation and the index value thereof of correlated series 0 in odd numbered sub-frames, be expressed as:

η _0,odd(0),η _0,odd(1),η _0,odd(2)

ξ _0,odd(0),ξ _0,odd(1),ξ _0,odd(2)

And and ξ _{0, odd}(0), ξ _{0, odd}(1), ξ _{0, odd}(2) first three correlation of the correlated series 1 of corresponding odd numbered sub-frames and index thereof, is expressed as:

η _1,odd(0),η _1,odd(1),η _1,odd(2)

ξ _1,odd(0),ξ _1,odd(1),ξ _1,odd(2)

After selecting index value, then, step 50 is performed: described multiple 0 sequence index value and multiple 1 sequence index value are formed multiple index pair, and to the plurality of index to judging, chooses multiple indexes pair wherein.

Such as, 0 sequence index value of even subframe and 1 sequence index value are combined, to form multiple index pair.Whether in the present embodiment, identical according to group (0), group (1), group (2), a point multiple situation combines.Specific as follows:

If group (0) ≠ group (1) ≠ group (2), then combine as described in Table 1:

Index m 0	Index m 1	Correlation
			I 0(0)＝ξ 0,even(0)	I 1(0)＝ξ 1,even(0)	η(0)＝η 0,even(0)+η 1,even(0)
I 0(1)＝ξ 0,even(1)	I 1(1)＝ξ 1,even(1)	η(1)＝η 0,even(1)+η 1,even(1)
			I 0(2)＝ξ 0,even(2)	I 1(2)＝ξ 1,even(2)	η(2)＝η 0,even(2)+η 1,even(2)
I 0(3)＝-1	I 1(3)＝-1	η(3)＝0
			I 0(4)＝-1	I 1(4)＝-1	η(4)＝0
I 0(5)＝-1	I 1(5)＝-1	η(5)＝0

I 0(6)＝-1	I 1(6)＝-1	η(6)＝0
			I 0(7)＝-1	I 1(7)＝-1	η(7)＝0
I 0(8)＝-1	I 1(8)＝-1	η(8)＝0

Table 1

If group (0)=group (1) ≠ group (2), then combine as described in Table 2:

Index m 0	Index m 1	Correlation
			I 0(0)＝ξ 0,even(0)	I 1(0)＝ξ 1,even(0)	η(0)＝η 0,even(0)+η 1,even(0)
I 0(1)＝ξ 0,even(0)	I 1(1)＝ξ 1,even(1)	η(1)＝η 0,even(0)+η 1,even(1)
			I 0(2)＝ξ 0,even(1)	I 1(2)＝ξ 1,even(0)	η(2)＝η 0,even(1)+η 1,even(0)
I 0(3)＝ξ 0,even(1)	I 1(3)＝ξ 1,even(1)	η(3)＝η 0,even(1)+η 1,even(1)
			I 0(4)＝ξ 0,even(2)	I 1(4)＝ξ 1,even(2)	η(4)＝η 0,even(2)+η 1,even(2)
I 0(5)＝-1	I 1(5)＝-1	η(5)＝0
			I 0(6)＝-1	I 1(6)＝-1	η(6)＝0
I 0(7)＝-1	I 1(7)＝-1	η(7)＝0
			I 0(8)＝-1	I 1(8)＝-1	η(8)＝0

Table 2

If group (0)=group (2) ≠ group (1), then combine as described in Table 3:

Index m 0	Index m 1	Correlation
			I 0(0)＝ξ 0,even(0)	I 1(0)＝ξ 1,even(0)	η(0)＝η 0,even(0)+η 1,even(0)
I 0(1)＝ξ 0,even(0)	I 1(1)＝ξ 1,even(2)	η(1)＝η 0,even(0)+η 1,even(2)
			I 0(2)＝ξ 0,even(2)	I 1(2)＝ξ 1,even(0)	η(2)＝η 0,even(2)+η 1,even(0)
I 0(3)＝ξ 0,even(2)	I 1(3)＝ξ 1,even(2)	η(3)＝η 0,even(2)+η 1,even(2)
			I 0(4)＝ξ 0,even(1)	I 1(4)＝ξ 1,even(1)	η(4)＝η 0,even(1)+η 1,even(1)
I 0(5)＝-1	I 1(5)＝-1	η(5)＝0
			I 0(6)＝-1	I 1(6)＝-1	η(6)＝0
I 0(7)＝-1	I 1(7)＝-1	η(7)＝0
			I 0(8)＝-1	I 1(8)＝-1	η(8)＝0

Table 3

If group (0) ≠ group (1)=group (2), then combine as described in Table 4:

Index m 0	Index m 1	Correlation
			I 0(0)＝ξ 0,even(0)	I 1(0)＝ξ 1,even(0)	η(0)＝η 0,even(0)+η 1,even(0)
I 0(1)＝ξ 0,even(1)	I 1(1)＝ξ 1,even(1)	η(1)＝η 0,even(1)+η 1,even(1)
			I 0(2)＝ξ 0,even(1)	I 1(2)＝ξ 1,even(2)	η(2)＝η 0,even(1)+η 1,even(2)
I 0(3)＝ξ 0,even(2)	I 1(3)＝ξ 1,even(1)	η(3)＝η 0,even(2)+η 1,even(1)
			I 0(4)＝ξ 0,even(2)	I 1(4)＝ξ 1,even(2)	η(4)＝η 0,even(2)+η 1,even(2)
I 0(5)＝-1	I 1(5)＝-1	η(5)＝0
			I 0(6)＝-1	I 1(6)＝-1	η(6)＝0
I 0(7)＝-1	I 1(7)＝-1	η(7)＝0
			I 0(8)＝-1	I 1(8)＝-1	η(8)＝0

Table 4

If group (0)=group (1)=group (2), then combine as described in Table 5:

Index m 0	Index m 1	Correlation
			I 0(0)＝ξ 0,even(0)	I 1(0)＝ξ 1,even(0)	η(0)＝η 0,even(0)+η 1,even(0)
I 0(1)＝ξ 0,even(0)	I 1(1)＝ξ 1,even(1)	η(1)＝η 0,even(0)+η 1,even(1)
			I 0(2)＝ξ 0,even(0)	I 1(2)＝ξ 1,even(2)	η(2)＝η 0,even(0)+η 1,even(2)
I 0(3)＝ξ 0,even(1)	I 1(3)＝ξ 1,even(0)	η(3)＝η 0,even(1)+η 1,even(0)
			I 0(4)＝ξ 0,even(1)	I 1(4)＝ξ 1,even(1)	η(4)＝η 0,even(1)+η 1,even(1)
I 0(5)＝ξ 0,even(1)	I 1(5)＝ξ 1,even(2)	η(5)＝η 0,even(1)+η 1,even(2)
			I 0(6)＝ξ 0,even(2)	I 1(6)＝ξ 1,even(0)	η(6)＝η 0,even(2)+η 1,even(0)
I 0(7)＝ξ 0,even(2)	I 1(7)＝ξ 1,even(1)	η(7)＝η 0,even(2)+η 1,even(1)
			I 0(8)＝ξ 0,even(2)	I 1(8)＝ξ 1,even(2)	η(8)＝η 0,even(2)+η 1,even(2)

Table 5

For odd numbered sub-frames, utilize identical method, also can obtain 5 kinds of compound modes, index is to { I ₀(j), I ₁(j) }, j=9,10 ..., 17 represent, correlation η (j), j=9,10 ..., 17 represent.

Certainly, in other embodiments of the invention, also can not to group (0), group (1), whether group (2) identical distinguishes, and 0 sequence index value of dual numbers subframe and 1 sequence index value are directly combined into as shown in table 6 below:

Index m 0	Index m 1	Correlation
			I 0(0)＝ξ 0,even(0)	I 1(0)＝ξ 1,even(0)	η(0)＝η 0,even(0)+η 1,even(0)
I 0(1)＝ξ 0,even(0)	I 1(1)＝ξ 1,even(1)	η(1)＝η 0,even(0)+η 1,even(1)
			I 0(2)＝ξ 0,even(0)	I 1(2)＝ξ 1,even(2)	η(2)＝η 0,even(0)+η 1,even(2)
I 0(3)＝ξ 0,even(1)	I 1(3)＝ξ 1,even(0)	η(3)＝η 0,even(1)+η 1,even(0)
			I 0(4)＝ξ 0,even(1)	I 1(4)＝ξ 1,even(1)	η(4)＝η 0,even(1)+η 1,even(1)
I 0(5)＝ξ 0,even(1)	I 1(5)＝ξ 1,even(2)	η(5)＝η 0,even(1)+η 1,even(2)
			I 0(6)＝ξ 0,even(2)	I 1(6)＝ξ 1,even(0)	η(6)＝η 0,even(2)+η 1,even(0)
I 0(7)＝ξ 0,even(2)	I 1(7)＝ξ 1,even(1)	η(7)＝η 0,even(2)+η 1,even(1)
			I 0(8)＝ξ 0,even(2)	I 1(8)＝ξ 1,even(2)	η(8)＝η 0,even(2)+η 1,even(2)

Table 6

Certainly, also directly can combine as even subframe odd numbered sub-frames.

In the present embodiment, to the index of above-mentioned formation to carrying out merger process further.If the index in even subframe and odd numbered sub-frames is to there being following relation:

I ₀(i)＝I ₁(j)&&I ₁(i)＝I ₀(j),i＝0,1,...,8,j＝9,10,...,17

Then correlation corresponding in odd numbered sub-frames is integrated on even subframe, and by index corresponding in odd numbered sub-frames to being set to-1, correlation is set to 0.Namely when the index in even subframe pair with the index in odd numbered sub-frames to when having identical, by by index to being set to-1, correlation is set to 0 and removes an index pair, simultaneously, the correlation of an index centering is integrated on the correlation of another index centering, namely increases the correlation that the index that is retained is right.

After completing the right formation of above-mentioned index, to index to judging, finally to choose multiple index pair, by the plurality of index pair, calculation plot group #.

In receiving auxiliary synchronous signals in reality, and do not know the sequencing of subframe, what namely first receive might not be subframe 0, therefore, in the present embodiment, first determines the corresponding relation of even subframe, odd numbered sub-frames and subframe 0, subframe 5.Concrete grammar is as follows:

$i=\arg \underset{j}{\max }\left\{\mathrm{\η}\left(j\right)\right\},j=\mathrm{0,1},...,17$

If (i<9 & & I ₀(i) <I ₁(i)) || (i>8 & & I ₀(i) >I ₁(i)), then the corresponding subframe 0 of even subframe, the corresponding subframe 5 of odd numbered sub-frames.

If (i<9 & & I ₀(i) >I ₁(i)) || (i>8 & & I ₀(i) <I ₁(i)), then the corresponding subframe 5 of even subframe, the corresponding subframe 0 of odd numbered sub-frames.

After the frame timing determining 10ms, according to the m of subframe 0, subframe 5 ₀, m ₁characteristic, will not meet rule index to removal, in the present embodiment, by do not meet rule the correlation of index to correspondence set to 0.Concrete determination methods is as follows:

When even subframe is subframe 0, then

$\mathrm{\&eta;}\left(i\right)=\left\{\begin{array}{cc}0& \mathrm{if}(I_0\left(i\right)>I_1\left(i\right),i=\mathrm{0,1},...,8)\\ 0& \mathrm{if}(I_0\left(i\right)<I_1\left(i\right),i=\mathrm{9,10},...,17)\end{array}\right.$

When even subframe is subframe 5, then

$\mathrm{\&eta;}\left(i\right)=\left\{\begin{array}{cc}0& \mathrm{if}(I_0\left(i\right)<I_1\left(i\right),i=\mathrm{0,1},...,8)\\ 0& \mathrm{if}(I_0\left(i\right)>I_1\left(i\right),i=\mathrm{9,10},...,17)\end{array}\right.$

After above-mentioned judgement, remaining index is to all can with follow-up calculation plot group #.In the present embodiment, select first three maximum index of correlation in order to subsequent calculations cell group number remaining index centering, be expressed as: $\{I_0^{\max }\left(0\right),I_1^{\max }\left(0\right)\},\{I_0^{\max }\left(1\right),I_1^{\max }\left(1\right)\},\{I_0^{\max }\left(2\right),I_1^{\max }\left(2\right)\}.$

Finally, step 60 is performed: according to the multiple indexes pair chosen, obtain multiple cell group number.

Concrete, by the index pair chosen in less value be assigned to m ₀, larger value is assigned to m ₁; Then, according to following formula

m'＝31(m ₁-m ₀-1)+m ₀

$N_{\mathrm{ID}}^{\left(1\right)}=m^{\&prime;}-q(q+1)/2$

Calculate cell group number and index pair perform as index pair the same operation, thus the LTE system secondary synchronization code detection method provided by the present embodiment just can obtain three cell group number improve cell detection efficiency.

Embodiment two

Present embodiments provide a kind of device realizing LTE system secondary synchronization code detection method described in embodiment one.Please refer to Fig. 4, it is the frame schematic diagram of the LTE system secondary synchronization code checkout gear of the embodiment of the present invention two.As shown in Figure 4, checkout gear 40 comprises:

Frequency domain conversion and carrier wave reordering module 410, in order to receive the auxiliary synchronous signals of time domain, and convert frequency-region signal to and carry out carrier wave rearrangement;

Deinterleaving and descrambling module 420, in order to carry out deinterleaving and scramble process, to obtain one group of correlated series 0 and eight groups of correlated serieses 1 to the output of frequency domain conversion and carrier wave reordering module 410;

Correlation module 430, in order to carry out circular correlation to the output of deinterleaving and descrambling module 420, with the correlation of the correlation and eight groups of correlated serieses 1 that obtain one group of correlated series 0;

Index value chooses module 440, in order to choose multiple correlation in the correlation of one group of correlated series 0 that exports from correlation module 430 and to obtain the multiple 0 sequence index values corresponding with the plurality of correlation, choose multiple correlation in the correlation of eight groups of correlated serieses 1 and obtain the multiple 1 sequence index values corresponding with the plurality of correlation;

Described multiple 0 sequence index value and multiple 1 sequence index value, to choosing module 450, are formed multiple index pair in order to the output choosing module 440 according to index value, and to the plurality of index to judging, choose multiple index pair by index;

Cell group number computing module 460, in order to according to index to choose module 450 export the multiple indexes pair be selected, calculation plot group #, to obtain multiple cell group number.

Wherein, frequency domain conversion and carrier wave reordering module 410, deinterleaving and descrambling module 420, correlation module 430, index value choose module 440, index to choosing module 450 and cell group number computing module 460 connects in turn, the output being input as last module of a rear module, and the auxiliary synchronous signals being input as the time domain of reception of frequency domain conversion and carrier wave reordering module 410, export multiple cell group number eventually through cell group number computing module 460 thus improve the efficiency of cell detection.

Foregoing description is only the description to present pre-ferred embodiments, any restriction not to the scope of the invention, and any change that the those of ordinary skill in field of the present invention does according to above-mentioned disclosure, modification, all belong to the protection range of claims.

Claims (8)

1. a LTE system secondary synchronization code detection method, is characterized in that, comprising:

Step 10: the auxiliary synchronous signals receiving time domain, and convert frequency-region signal to and carry out carrier wave rearrangement;

Step 20: carry out deinterleaving and scramble process to the result of step 10, to obtain one group of correlated series 0 and eight groups of correlated serieses 1;

Step 30: carry out circular correlation to the result of step 20, with the correlation of the correlation and eight groups of correlated serieses 1 that obtain one group of correlated series 0;

Step 40: choose multiple correlation and obtain the multiple 0 sequence index values corresponding with the plurality of correlation from the correlation of described one group of correlated series 0, chooses multiple correlation and obtains the multiple 1 sequence index values corresponding with the plurality of correlation from the correlation of described eight groups of correlated serieses 1;

Step 50: described multiple 0 sequence index value and multiple 1 sequence index value are formed multiple index pair, and to the plurality of index to judging, chooses multiple indexes pair wherein;

Step 60: according to the multiple indexes pair chosen, obtain multiple cell group number; Wherein,

Described step 40 comprises the steps:

Step 41: choose maximum N from the correlation of one group of correlated series 0 of even subframe ₁individual correlation also obtains and this N ₁the N that individual correlation is corresponding ₁individual 0 sequence index value;

Step 42: to described N ₁individual 0 sequence index value is carried out mould 8 and is processed, and according to the result after the process of this mould 8, from eight groups of correlated serieses 1 of even subframe, chooses corresponding group;

Step 43: choose maximum M in the correlation of the described corresponding group chosen ₁individual correlation also obtains and this M ₁the M that individual correlation is corresponding ₁individual 1 sequence index value;

Wherein, described N ₁, M ₁for natural number.

2. LTE system secondary synchronization code detection method as claimed in claim 1, it is characterized in that, described step 40 also comprises the steps:

Step 44: choose maximum N from the correlation of one group of correlated series 0 of odd numbered sub-frames ₂individual correlation also obtains and this N ₂the N that individual correlation is corresponding ₂individual 0 sequence index value;

Step 45: to described N ₂individual 0 sequence index value is carried out mould 8 and is processed, and according to the result after the process of this mould 8, from eight groups of correlated serieses 1 of odd numbered sub-frames, chooses corresponding group;

Step 46: choose maximum M in the correlation of the described corresponding group chosen ₂individual correlation also obtains and this M ₂the M that individual correlation is corresponding ₂individual 1 sequence index value;

Wherein, described N ₂, M ₂for natural number.

3. LTE system secondary synchronization code detection method as claimed in claim 2, it is characterized in that, described step 50 comprises the steps:

Step 51: by described N ₁individual 0 sequence index value and M ₁individual 1 sequence index value composition P ₁individual index pair;

Step 52: by described N ₂individual 0 sequence index value and M ₂individual 1 sequence index value composition P ₂individual index pair;

Step 53: to the index formed in above-mentioned steps to judging, choose Q ₁individual index pair;

Wherein, P ₁, P ₂, Q ₁for natural number.

4. LTE system secondary synchronization code detection method as claimed in claim 3, is characterized in that, also comprise step 521 after the step 52: to P ₁individual index to and P ₂individual index to carrying out merger process, to remove of two identical index centerings.

5. LTE system secondary synchronization code detection method as claimed in claim 4, is characterized in that, when two indexes are to time identical, is added by these two indexes to corresponding correlation, and using the correlation after being added as the index retained to corresponding correlation.

6. LTE system secondary synchronization code detection method as claimed in claim 5, it is characterized in that, described step 53 comprises the steps:

Step 531: the corresponding relation determining even subframe, odd numbered sub-frames and subframe 0, subframe 5;

Step 532: according to the characteristic of subframe 0 with subframe 5, remove invalid index pair;

Step 533: remaining index centering, choose the Q that correlation is maximum ₁individual index pair.

7. the LTE system secondary synchronization code detection method as described in any one in claim 1 to 6, it is characterized in that, described step 60 comprises the steps:

Step 61: choose value that index centering is less is assigned to m ₀, larger value is assigned to m ₁;

Step 62: according to formula

m'＝31(m ₁-m ₀-1)+m ₀

$N_{\mathrm{ID}}^{\left(1\right)}=m^{\&prime;}-q(q+1)/2$

Calculate cell group number;

Step 63: repeated execution of steps 61 and step 62, thus according to the multiple indexes pair chosen, to obtain multiple cell group number.

8. realize a device for the LTE system secondary synchronization code detection method as described in any one in claim 1 to 7, it is characterized in that, comprising:

Frequency domain conversion and carrier wave reordering module, in order to receive the auxiliary synchronous signals of time domain, and convert frequency-region signal to and carry out carrier wave rearrangement;

Deinterleaving and descrambling module, in order to carry out deinterleaving and scramble process, to obtain one group of correlated series 0 and eight groups of correlated serieses 1 to the output of frequency domain conversion and carrier wave reordering module;

Correlation module, in order to carry out circular correlation to the output of deinterleaving and descrambling module, with the correlation of the correlation and eight groups of correlated serieses 1 that obtain one group of correlated series 0;

Index value chooses module, in order to choose multiple correlation in the correlation of one group of correlated series 0 that exports from correlation module and to obtain the multiple 0 sequence index values corresponding with the plurality of correlation, choose multiple correlation in the correlation of eight groups of correlated serieses 1 and obtain the multiple 1 sequence index values corresponding with the plurality of correlation;

Described multiple 0 sequence index value and multiple 1 sequence index value, to choosing module, are formed multiple index pair in order to the output choosing module according to index value, and to the plurality of index to judging, choose multiple index pair by index;

Cell group number computing module, in order to according to index to choose module export the multiple indexes pair be selected, calculation plot group #, to obtain multiple cell group number.