CN103037411A - Method and device for detecting secondary synchronization code of long term evolution (LTE) system - Google Patents

Abstract

The invention provides a method and a device for detecting a secondary synchronization code of an LTE system. The method comprises the steps of receiving a secondary synchronization signal of a time domain, converting into a frequency domain signal, and rearranging carrier waves; conducting de-interleaving and descrambling processing for the result to obtain a group of correlation sequences 0 and eight groups of correlation sequences 1; conducting circular correlation for the results to obtain related values; selecting a plurality of related values from related values of the group of correlation sequences 0 and obtaining a plurality of 0 sequence index values corresponding to the plurality of related values, and selecting a plurality of related values from related values of the eight groups of correlation sequences 1 and obtaining a plurality of 1 sequence index values corresponding to the plurality of related values; forming a plurality of index pairs through the plurality of 0 sequence index values and the plurality of 1 sequence index values, judging the plurality of index pairs, and selecting a plurality of index pairs from the plurality of index pairs; and according to the selected plurality of index pairs, obtaining a plurality of cell group numbers, so that the cell detection efficiency is improved.

Description

LTE system secondary synchronization code detection method and device

Technical field

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

Background technology

In order to tackle the rapid emergence of global inserting of microwave interoperability (WiMAX) technology, 3GPP will have started Long Term Evolution (LTE) plan of universal mobile telecommunications system (UMTS) technology in the end of the year 2004.This plan purpose is to introduce the wireless air interface in the whole world and various advanced persons' technology, in order to reach larger transmission rate, less access delay and larger power system capacity.According to present LTE standard, the maximum peak rate of supporting 300Mbps of system descending, the up maximum peak rate of supporting 75Mbps.

Needing to detect secondary synchronization code (Secondary Synchronization Code, SSC) in the cell search process of LTE system realizes synchronously.There are TDD (time division duplex) and two kinds of patterns of FDD (Frequency Division Duplexing (FDD)) in the LTE system, and for the detection method of SSC, two kinds of patterns are identical.For sake of convenience, the below describes the detection method of SSC according to tdd mode.

Known SSC is defined as follows:

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

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

0≤n≤30 wherein, m ₀And m ₁By the cell ID group number

Generate:

m ₀＝m′mod 31

Sequence

With

Corresponding to the m sequence

Two different cyclic shifts:

Wherein

Be defined as follows:

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

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

c ₀(n) and c ₁(n) be two scramble sequence, be the m sequence

Different cyclic shifts, shift value depends on P-SCH, also namely depends on numbering in the cell ID group

Wherein

Be defined as follows:

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

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

With

Also be scrambler sequence, by the m sequence

Cyclic shift generates:

Wherein

Be defined as follows:

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

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

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

On frequency domain, the bandwidth of cell of system's support has six types of 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and 20MHz etc., and 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 residential quarter is much, and SSC is distributed in 62 subcarriers on 6 RB of center frequency point both sides at frequency domain, and as the protection interval, the distribution on frequency domain as shown in Figure 2 at two ends for remaining 10 sub-distribution of carriers.

The secondary synchronization code of LTE system detects the good correlation of having utilized the m sequence, determines the cell set numbering by the position of correlation peak

In cell search process, always there are simultaneously a plurality of residential quarters in the real environment.For measurement and the mobility of support terminal equipment, just need terminal to detect accurately the information of all adjacent cells except this residential quarter.The secondary synchronization code detection technique of a kind of LTE system is disclosed in the Chinese patent application " secondary synchronization sequences detection method and the device of long evolving system " that be 200910198610.6 at application number, publication number is 102055698A, yet in this patent application in the one-time detection process of secondary synchronization code detection algorithm, can only export one prominent Value.After detection is finished, need to be with this

Could detect the next cell information that exists after corresponding cell signal is eliminated, namely cell detection efficient is not high.

Summary of the invention

The object of the present invention is to provide a kind of LTE system's secondary synchronization code detection method and device, can only export a prominent cell set numbering with one-time detection in the solution prior art

Value, thereby the not high problem of cell detection efficient.

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: receive the auxiliary synchronous signals of time domain, and convert frequency-region signal to and carry out carrier wave and reset; Step 20: the result to step 10 carries out deinterleaving and scramble process, to obtain one group of correlated series 0 and eight groups of correlated serieses 1; Step 30: the result to step 20 carries out circular correlation, with the correlation that obtains one group of correlated series 0 and the correlation of eight groups of correlated serieses 1; Step 40: from the correlation of described one group of correlated series 0, choose a plurality of correlations and obtain a plurality of 0 sequence index values corresponding with these a plurality of correlations, from the correlation of described eight groups of correlated serieses 1, choose a plurality of correlations and obtain a plurality of 1 sequence index values corresponding with these a plurality of correlations; Step 50: described a plurality of 0 sequence index values and a plurality of 1 sequence index value are formed a plurality of index pair, and to these a plurality of index to judging, choose a plurality of index pair wherein; Step 60: according to a plurality of index of choosing pair, obtain a plurality of cell set numberings.

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

Optionally, in described LTE system secondary synchronization code detection method, described step 40 also comprises the steps: step 44: choose maximum N from the correlation of one group of correlated series 0 of odd number subframe 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 processing, and the result after processing according to this mould 8 chooses corresponding group from eight groups of correlated serieses 1 of odd number subframe; Step 46: in the correlation of the described corresponding group of choosing, choose maximum M ₂Individual correlation also obtains and this M ₂The M that individual correlation is corresponding ₂Individual 1 sequence index value; Wherein, described N ₂, M ₂Be natural number.

Optionally, in described LTE system secondary synchronization code detection method, described step 50 comprises the steps: step 51: with described N ₁Individual 0 sequence index value and M ₁Individual 1 sequence index value forms P ₁Individual index pair; Step 52: with described N ₂Individual 0 sequence index value and M ₂Individual 1 sequence index value forms P ₂Individual index pair; Step 53: the index that forms in the above-mentioned steps to judging, is chosen Q ₁Individual index pair; Wherein, P ₁, P ₂, Q ₁Be natural number.

Optionally, in described LTE system secondary synchronization code detection method, after step 52, also comprise step 521: to P ₁Individual index is to reaching P ₂Individual index is processed carrying out merger, to remove of two identical index centerings.

Optionally, in described LTE system secondary synchronization code detection method, when two index when identical, with these two index to corresponding correlation addition, and with the correlation after the addition as the index that keeps to corresponding correlation.

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

Optionally, in described LTE system secondary synchronization code detection method, described step 60 comprises the steps: step 61: a less value of index centering will choosing is assigned to m ₀, larger value is assigned to m ₁Step 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 the cell set numbering; Step 63: repeated execution of steps 61 and step 62, thereby according to a plurality of index of choosing pair, to obtain a plurality of cell set numberings.

The present invention also provides a kind of device of realizing above-mentioned LTE system secondary synchronization code detection method, comprising: frequency domain conversion and carrier wave reordering module in order to receiving the auxiliary synchronous signals of time domain, and convert frequency-region signal to and carry out carrier wave and reset; Deinterleaving and descrambling module are in order to carry out deinterleaving and scramble process to the output of frequency domain conversion and carrier wave reordering module, to obtain one group of correlated series 0 and eight groups of correlated serieses 1; Correlation module carries out circular correlation in order to the output to deinterleaving and descrambling module, with the correlation that obtains one group of correlated series 0 and the correlation of eight groups of correlated serieses 1; Index value is chosen module, in order to from the correlation of one group of correlated series 0 of correlation module output, to choose a plurality of correlations and to obtain a plurality of 0 sequence index values corresponding with this a plurality of correlations, choose the also acquisition a plurality of 1 sequence index values corresponding with these a plurality of correlations of a plurality of correlations in the correlation of eight groups of correlated serieses 1; Index is to choosing module, in order to the output of choosing module according to index value described a plurality of 0 sequence index values and a plurality of 1 sequence index value formed a plurality of index pair, and to these a plurality of index to judging, choose a plurality of index pair; Cell set numbering computing module, in order to according to index to a plurality of index that are selected of choosing module output pair, the calculation plot group # is to obtain a plurality of cell set numberings.

In LTE system's secondary synchronization code detection method provided by the invention and device, can obtain a plurality of cell set numberings, thereby improve cell detection efficient.

Description of drawings

Fig. 1 is the position of SSC on 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 invention one;

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

Embodiment

Below in conjunction with the drawings and specific embodiments LTE system's 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 very the form of simplifying, only in order to convenient, the purpose of the aid illustration embodiment of the invention lucidly.

Embodiments of the invention have been described the SSC detection technique in the LTE system, and there are TDD and two kinds of patterns of FDD in the LTE system, and for the detection method of SSC, two kinds of patterns are identical.For simplicity's sake, if specified otherwise not, following embodiment narrates according to tdd mode.In addition, the present invention is the further improved technical scheme that is 200910198610.6 at application number, proposes on the basis of Chinese patent application " secondary synchronization sequences detection method and the device of long evolving system " that publication number is 102055698A, the content of the relevant prior art that is not described in detail in the present invention can be 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 invention one.As shown in Figure 3, LTE system secondary synchronization code detection method specifically comprises the steps:

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

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

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

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

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

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

Concrete, at first, from the correlation of one group of correlated series 0 of even number subframe, choose maximum N ₁Individual correlation also obtains and this N ₁The N that individual correlation is corresponding ₁Individual 0 sequence index value.For example: choose first three correlation of maximum of the correlated series 0 of even number subframe, simultaneously, 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 obtains by circular correlation in the step 30 of present embodiment, and when 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 obtain by prior art.

After having obtained 0 sequence index value of correlated series 0, determine corresponding with it correlated series 1 according to this 0 sequence index value, namely from eight groups of correlated serieses 1, choose one group of correlated series 1.According to the introduction that in the background technology SSC is defined as can be known, process by 0 sequence index value of correlated series 0 being carried out mould 8, just can determine the correlated series 1 corresponding with this 0 sequence index value.On the aforementioned basis of choosing three correlations and index value, determining and can be expressed as correlated series 1:

group(i)＝mod(ξ _0，even(i)，8)，i＝0，1，2

Then, in the correlation of selected corresponding group, choose maximum M ₁Individual correlation also obtains and this M ₁The M that individual correlation is corresponding ₁Individual 1 sequence index value.In the present embodiment, in each corresponding group, choose the correlation of a maximum, owing to chosen three groups, thus can obtain three 1 sequence index values.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 finishing

In element

Set to 0.

Order

And select corresponding index value ξ _{1, even}(1).Selection will after finishing

In element

Set to 0.

Order

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

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

Secondly, owing to every group choose is to be undertaken by mould 8 operations of 0 sequence index value, thus, group (0) might appear, group (1), group (2) points to same group situation, for example: 0 sequence index value is respectively 7,15,23, then, to cause thus group (0), group (1), group (2) points to same group, therefore, in the present embodiment, in order to ensure subsequent group, for example the selected correlation of the selected correlation of group (1) and group (0) is different, improves the validity that correlation is chosen, after group (0) has chosen maximum related value, this correlation is set to 0, namely so that this correlation is 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 select index value after, 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 guarantees.

By said method, just can select a plurality of index values of the correlated series 1 of a plurality of index values of correlated series 0 of even number subframe and even number subframe.

Utilize identical method, also a plurality of index values of the correlated series 1 of a plurality of index values of the optional correlated series 0 that goes out the odd number subframe and odd number subframe.

In the present embodiment, select first three correlation and the index value thereof of the maximum of correlated series 0 in the odd number subframe, 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 and the index thereof of the correlated series 1 of corresponding odd number subframe are 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, execution in step 50: described a plurality of 0 sequence index values and a plurality of 1 sequence index value are formed a plurality of index pair, and to these a plurality of index to judging, choose a plurality of index pair wherein.

For example, 0 sequence index value and the 1 sequence index value of even number subframe made up, to form a plurality of index pair.In the present embodiment, whether identical according to group (0), group (1), group (2), a minute multiple situation makes up.Specific as follows:

If group (0) ≠ group (1) ≠ group (2), then combination is 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 combination is 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 combination is 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 combination is 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 combination is 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，evrn(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 the odd number subframe, utilize identical method, also can obtain 5 kinds of compound modes, index is to using { I ₀(j), I ₁(j) }, j=9,10 ..., 17 represent, correlation η (j), and j=9,10 ..., 17 represent.

Certainly, in other embodiments of the invention, can be not yet to group (0), group (1), group (2) the identical differentiation whether, and 0 sequence index value of dual numbers subframe and 1 sequence index value directly are 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，eveb(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 can be such as directly combination as the even number subframe to the odd number subframe.

In the present embodiment, the index of above-mentioned formation is processed further carrying out merger.If the index in even number subframe and the odd number subframe 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 corresponding correlation in the odd number subframe is integrated on the even number subframe, and corresponding index in the odd number subframe is set to 0 to being set to-1 with correlation.When namely the index in the even number subframe pair is identical to having with index in the odd number subframe, by with index to being set to-1, correlation is set to 0 removes an index pair, simultaneously, the correlation of an index centering is integrated on the correlation of another index centering, has namely increased the right correlation of index that is retained.

After having finished the right formation of above-mentioned index, to index to judging, finally choosing a plurality of index pair, by this a plurality of index pair, the calculation plot group #.

Because when reality receives auxiliary synchronous signals, and do not know the sequencing of subframe, what namely at first receive might not be subframe 0, therefore, in the present embodiment, determines first the corresponding relation of even number subframe, odd number subframe 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﹠amp; ﹠amp; I ₀(i)＜I ₁(i)) || (i＞8﹠amp; ﹠amp; I ₀(i)＞I ₁(i)), the corresponding subframe 0 of even number subframe then, the corresponding subframe 5 of odd number subframe.

If (i＜9﹠amp; ﹠amp; I ₀(i)＞I ₁(i)) || (i＞8﹠amp; ﹠amp; I ₀(i)＜I ₁(i)), the corresponding subframe 5 of even number subframe then, the corresponding subframe 0 of odd number subframe.

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

When the even number 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 the even number subframe is subframe 5, then

$\mathrm{\&eta;}\left(i\right)=\left\{\begin{array}{cc}0& \mathrm{if}(I_0\left(i\right){<I}_1\left(i\right),i=\mathrm{0,1},...,8)\\ 0& \mathrm{if}(I_0\left(i\right)>I_1\left(i\right),i=\mathrm{9,10},...,17)\end{array}\right.$

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

At last, execution in step 60: according to a plurality of index of choosing pair, obtain a plurality of cell set numberings.

Concrete, with an index choosing pair

In less value be assigned to m ₀, larger value is assigned to m ₁Then, 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 the cell set numbering And index pair

Carry out such as index pair

The same operation, thus the LTE system secondary synchronization code detection method that provides by present embodiment just can obtain three cell set numberings

Improved cell detection efficient.

Embodiment two

Present embodiment provides the device of the described LTE of a kind of embodiment of realization one system secondary synchronization code detection method.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 invention two.As shown in Figure 4, checkout gear 40 comprises:

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

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

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

Index value is chosen module 440, in order to from the correlation of one group of correlated series 0 of correlation module 430 output, to choose a plurality of correlations and to obtain a plurality of 0 sequence index values corresponding with this a plurality of correlations, choose the also acquisition a plurality of 1 sequence index values corresponding with these a plurality of correlations of a plurality of correlations in the correlation of eight groups of correlated serieses 1;

Index is to choosing module 450, in order to the output of choosing module 440 according to index value described a plurality of 0 sequence index values and a plurality of 1 sequence index value formed a plurality of index pair, and to these a plurality of index to judging, choose a plurality of index pair;

Cell set numbering computing module 460, in order to according to index to a plurality of index that are selected of choosing module 450 outputs pair, the calculation plot group # is to obtain a plurality of cell set numberings.

Wherein, frequency domain conversion and carrier wave reordering module 410, deinterleaving and descrambling module 420, correlation module 430, index value are chosen module 440, index connects in turn to choosing module 450 and cell set numbering computing module 460, the output that is input as last module of a rear module, and the auxiliary synchronous signals of the time domain that is input as reception of frequency domain conversion and carrier wave reordering module 410, finally by a plurality of cell set numberings of cell set numbering computing module 460 outputs

Thereby improve the efficient of cell detection.

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

Claims (9)

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

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

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

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

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

Step 50: described a plurality of 0 sequence index values and a plurality of 1 sequence index value are formed a plurality of index pair, and to these a plurality of index to judging, choose a plurality of index pair wherein;

Step 60: according to a plurality of index of choosing pair, obtain a plurality of cell set numberings.

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

Step 41: from the correlation of one group of correlated series 0 of even number 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 processing, and the result after processing according to this mould 8 chooses corresponding group from eight groups of correlated serieses 1 of even number subframe;

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

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

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

Step 44: from the correlation of one group of correlated series 0 of odd number subframe, 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 processing, and the result after processing according to this mould 8 chooses corresponding group from eight groups of correlated serieses 1 of odd number subframe;

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

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

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

Step 51: with described N ₁Individual 0 sequence index value and M ₁Individual 1 sequence index value forms P ₁Individual index pair;

Step 52: with described N ₂Individual 0 sequence index value and M ₂Individual 1 sequence index value forms P ₂Individual index pair;

Step 53: the index that forms in the above-mentioned steps to judging, is chosen Q ₁Individual index pair;

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

5. LTE as claimed in claim 4 system secondary synchronization code detection method is characterized in that, also comprises step 521 after step 52: to P ₁Individual index is to reaching P ₂Individual index is processed carrying out merger, to remove of two identical index centerings.

6. LTE as claimed in claim 5 system secondary synchronization code detection method is characterized in that, when two index when identical, with these two index to corresponding correlation addition, and with the correlation after the addition as the index that keeps to corresponding correlation.

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

Step 531: the corresponding relation of determining even number subframe, odd number subframe and subframe 0, subframe 5;

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

Step 533: remaining index centering, choose the Q of correlation maximum ₁Individual index pair.

8. such as the described LTE of in the claim 1 to 7 each system secondary synchronization code detection method, it is characterized in that described step 60 comprises the steps:

Step 61: a less value of index centering will choosing 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 the cell set numbering;

Step 63: repeated execution of steps 61 and step 62, thereby according to a plurality of index of choosing pair, to obtain a plurality of cell set numberings.

9. the device of the described LTE of each in a realization such as the claim 1 to 8 system secondary synchronization code detection method is characterized in that, comprising:

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

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

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

Index value is chosen module, in order to from the correlation of one group of correlated series 0 of correlation module output, to choose a plurality of correlations and to obtain a plurality of 0 sequence index values corresponding with this a plurality of correlations, choose the also acquisition a plurality of 1 sequence index values corresponding with these a plurality of correlations of a plurality of correlations in the correlation of eight groups of correlated serieses 1;

Index is to choosing module, in order to the output of choosing module according to index value described a plurality of 0 sequence index values and a plurality of 1 sequence index value formed a plurality of index pair, and to these a plurality of index to judging, choose a plurality of index pair;

Cell set numbering computing module, in order to according to index to a plurality of index that are selected of choosing module output pair, the calculation plot group # is to obtain a plurality of cell set numberings.

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