CN101651983B - Downlink synchronization method and device used for communicating system - Google Patents

Abstract

The present invention provides a downlink synchronization method and device used for communicating system. The downlink synchronization method includes the following steps: obtaining initial data and calculating the energy sum of a plurality of initial data segments with the scheduled length; performing slide correlation to each of the N downlink synchronous codes with the initial data, and calculating the energy value of each correlative value to obtain N groups of correlated energy values, where N is an integer greater than 1; using the energy sum of the plurality of initial data segments to respectively perform energy normalization to each group of the N group of correlated energy values; and using the N group of correlated energy values after energy normalization to determine the downlink synchronization code of the target cell and its location in the initial data.

Description

For down link synchronisation method and the device of communication system

Technical field

The present invention relates to mobile communication technology, relate more specifically to the down link synchronisation method for communication system and device.

Background technology

In TDMA communication system, the up-downgoing channel occupancy same frequency band between network side and user terminal (UE), supports the transmission of up-downgoing non-symmetrical service, the utilization of frequency spectrum has very large flexibility.Typical time-division multiple address system is such as Time division multiple access (TD-SCDMA) system.

In TD-SCDMA communication system, after mobile terminal is started shooting in Radio Network System, the first step of terminal connecting system to carry out cell initial search.The object of cell initial search selects suitable working frequency points, and on this frequency, obtain the down-going synchronous with community, current place, allow terminal equipment can access Cellular Networks rapidly, listening broadcast channel, receive the information of community, and the communication function of Cellular Networks can be realized by calling.

Fig. 1 illustrates the main process of cell initial search, and it comprises: carrier wave classification, Window detect, down-going synchronous (SyncDL) code is relevant, frequency deviation is estimated, training sequence (midamble) code is relevant, broadcast channel (BCH) Transmission Time Interval (TTI) detects and broadcast channel decoding.Specifically, the broadband power of carrier wave assorting process to carrier frequency each in time division duplex frequency band measures the frequency finding the position can determining descending pilot frequency time slot.Window testing process slightly searches the position of descending synchronous code in descending pilot frequency time slot.The pattern of the true descending synchronous code of descending synchronous code correlated process and accurate location.Frequency offset estimation procedure is estimated frequency shift (FS).Training sequence code correlated process determination training sequence code and scrambler sequence.Broadcast channel propagation time interval testing process and broadcast channel are set up synchronous and are detected the start-stop position of broadcast channel propagation time interval.Broadcast channel decode procedure is decoded to obtained broadcast channel information.

In cell initial search process, after carrier wave sort module have selected carrier wave and Window detection module has detected approximate SyncDL code position, SyncDL code correlation module makes received signal and all possible SyncDL code carry out relevant thus detect the position of starting point relative to present sub-frame border of the SyncDL code that Target cell uses and this SyncDL code.

Fig. 2 illustrates a typical subframe structure in TD-SCDMA system.In TD-SCDMA system, the time interval of 1 radio frames is 10 milliseconds, is made up of 2 subframes, and each subframe comprises 6400 chips.Each subframe comprises 7 time slot TS0 to TS6.Wherein TS0 and TS1 is respectively used to transmit uplink and downlink signals, and the up-downgoing position of conversion point between its direction of transfer and two time slots is changeless, and the direction of transfer of TS2 to TS6 time slot and the position of transfer point are variable.Three special time slots are contained at fixing position of conversion point place, are respectively down link pilot timeslot (DwPTS), protection interval (GP) and uplink pilot time slot (UpPTS).DwPTS takies 96 chips, and GP takies 96 chips, and UpPTS takies 160 chips.More specifically, DwPTS is made up of the SyncDL code of GP and 64 chip of 32 chips.

In fig. 2, the DwPTS comprising SyncDL code is the downlink time slots sent by base station (BS).After DwPTS, there are a UpPTS and several uplink time slots sent by other UE.There is such possibility, the power namely in uplink time slot is much larger than the power in DwPTS.When just cell edge carries out cell initial search, another UE sends data to the BS of this community to UE, the difference power between uplink downlink may be 50dB or larger.

When there is relatively high power difference between uplink time slot and DwPTS, the position of the maximum of correlation output may not in the position of the SyncDL of expection.On the contrary, the position of maximum may certain position in the uplink time slot with higher-wattage.Although do not have related gain in the position of mistake, correlation output still may be greater than the output in SyncDL position, this is because the reception data itself of carrying out being correlated with are enough large.This will cause flase drop and extends the duration of cell initial search.

Therefore, the method and apparatus of the precise and high efficiency of the down-going synchronous for communication system is needed.

Summary of the invention

According to a first aspect of the invention, provide a kind of down link synchronisation method for communication system, comprise the following steps: a. obtain primary data and calculate the primary data section of multiple predetermined length energy and; B. N number of descending synchronous code of system each is carried out slip to primary data respectively relevant, and calculates the energy value of each correlation, obtain N group correlation energy value, wherein N be greater than 1 integer; C. utilize the energy of multiple primary data section and respectively energy normalized carried out to each group of N group correlation energy value; And d. utilization determines the descending synchronous code of Target cell and the position in primary data thereof through the N group correlation energy value of energy normalized.

In this down link synchronisation method, carry out energy normalized according to following formula and be correlated with:

$\mathrm{corr}\_{\mathrm{out}}_{i,j}=Y_{i,j}*(1/X_i)$

$=\frac{\underset{k=i}{\overset{i+L-1}{\mathrm{\Σ}}}(\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*\mathrm{Sync}{\mathrm{DL}}_{k,j})*{(\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*\mathrm{Sync}{\mathrm{DL}}_{k,j})}^H}{\underset{k=i}{\overset{i+L-1}{\mathrm{\Σ}}}\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*\mathrm{rx}\_\mathrm{corr}\_{{\mathrm{in}}_k}^H},$

i＝1，2，...，n-63；j＝1，2，...，N

Wherein, corr_out _{i, j}represent the correlation energy value through energy normalized of i-th primary data section and a jth descending synchronous code, Y _{i, j}represent the correlation energy value of i-th primary data section and a jth descending synchronous code, X _irepresent i-th data segment of described multiple primary data section energy and, n represents the sum of chip in described primary data, and H represents and grips transposition altogether.

In this down link synchronisation method, i-th primary data section and a jth descending synchronous code is carried out energy normalized and in an identical manner this i-th primary data section and this jth descending synchronous code are divided into Q section relevant can comprising, and it is relevant to carry out this energy normalized according to following formula:

$\mathrm{corr}\_{\mathrm{out}}_{i,j}$

$=\underset{q=1}{\overset{Q}{\mathrm{\Σ}}}\frac{(\mathrm{part}\_\mathrm{corr}\_{\mathrm{in}}_q*\mathrm{part}\_\mathrm{Sync}{{\mathrm{DL}}_q}^H)*{(\mathrm{part}\_\mathrm{corr}\_{\mathrm{in}}_q*\mathrm{part}\_\mathrm{Sync}{{\mathrm{DL}}_q}^H)}^H}{\mathrm{part}\_\mathrm{corr}\_{\mathrm{in}}_q*\mathrm{part}\_\mathrm{corr}{{\_\mathrm{in}}_q}^H}$

i＝1，2，...，n-63；j＝1，2，...，N

Wherein, part_corr_in _qthe q section of i-th primary data section, part_SyncDL _qbe the q section of a jth descending synchronous code, H represents and grips transposition altogether, and Q be greater than 1 integer.Preferably, described dividing mode is decile.

In this down link synchronisation method, calculate corr_out _{i, j}can comprise the following steps: by X _izoom in or out Z times and round and obtain X _i' to make X _i' size within the scope of predetermined value, wherein Z be more than or equal to 1 integer; By Y _{i, j}zoom in or out identical Z times and round and obtain Y _{i, j}'; With X _i' search reciprocal table to obtain 1/X as index _i'; And by Y _{i, j}' and 1/X _i' being multiplied obtains corr_out _{i, j}.Preferably, can be realized by shifting function described in zoom in or out and round.

According to a second aspect of the invention, provide a kind of downlink synchronization device for communication system, comprising: input registration module, is configured to storing initial data; Energy accumulation block, is configured to the energy of each data segment of the primary data section of cumulative multiple predetermined length; Correlation energy value determination module, is configured to that N number of descending synchronous code of system each is carried out slip to primary data respectively relevant, and calculates the energy value of each correlation, obtain N group correlation energy value, wherein N be greater than 1 integer; Energy normalized module, is configured to utilize the energy of multiple primary data section and carry out energy normalized to each group of N group correlation energy value respectively; And descending synchronous code determination module, be configured to the N group correlation energy value of utilization through energy normalized to determine the descending synchronous code of Target cell and the position in primary data thereof.

In this downlink synchronization device, energy normalized module can be carried out energy normalized according to following formula and is correlated with:

$\mathrm{corr}\_{\mathrm{out}}_{i,j}$

$=\underset{q=1}{\overset{Q}{\mathrm{\Σ}}}\frac{(\mathrm{part}\_\mathrm{corr}\_{\mathrm{in}}_q*\mathrm{part}\_\mathrm{Sync}{{\mathrm{DL}}_q}^H)*{(\mathrm{part}\_\mathrm{corr}\_{\mathrm{in}}_q*\mathrm{part}\_\mathrm{Sync}{{\mathrm{DL}}_q}^H)}^H}{\mathrm{part}\_\mathrm{corr}\_{\mathrm{in}}_q*\mathrm{part}\_\mathrm{corr}\_{{\mathrm{in}}_q}^H}$

i＝1，2，...，n-63；j＝1，2，...，N

Wherein, corr_out _{i, j}represent the correlation energy value through energy normalized of i-th primary data section and a jth descending synchronous code, Y _{i, j}represent the correlation energy value of i-th primary data section and a jth descending synchronous code, X _irepresent i-th data segment of described multiple primary data section energy and, n represents the sum of chip in described primary data, and H represents and grips transposition altogether.

In energy normalized module, i-th primary data section and a jth descending synchronous code are carried out energy normalized and in an identical manner i-th primary data section and a jth descending synchronous code are divided into Q section relevant can comprising, and according to following formula carry out energy normalized be correlated with:

$\mathrm{corr}\_{\mathrm{out}}_{i,j}$

$=\underset{q=1}{\overset{Q}{\mathrm{\Σ}}}\frac{(\mathrm{part}\_\mathrm{corr}\_{\mathrm{in}}_q*\mathrm{part}\_\mathrm{Sync}{{\mathrm{DL}}_q}^H)*{(\mathrm{part}\_\mathrm{corr}\_{\mathrm{in}}_q*\mathrm{part}\_\mathrm{Sync}{{\mathrm{DL}}_q}^H)}^H}{\mathrm{part}\_\mathrm{corr}\_{\mathrm{in}}_q*\mathrm{part}\_\mathrm{corr}{{\_\mathrm{in}}_q}^H}$

Wherein, part_corr_in _qthe q section of i-th primary data section, part_SyncDL _qthe q section of a jth descending synchronous code, and Q be greater than 1 integer.Preferably, described dividing mode can be decile.

Energy normalized module can comprise: scaling rounds module, is configured to X _izoom in or out Z times and round and obtain X _i' to make X _i' size within the scope of predetermined value, then by Y _{i, j}zoom in or out identical Z times and round and obtain Y _{i, j}', wherein Z be more than or equal to 1 integer; Look into reciprocal table module, be configured to X _i' search reciprocal table to obtain 1/X as index _i'; And multiplier module, be configured to Y _{i, j}' and 1/X _i' being multiplied obtains corr_out _{i, j}.Preferably, can be realized by shifting function described in zoom in or out and round.

According to a third aspect of the invention we, a kind of communication equipment comprising above-mentioned downlink synchronization device is provided.

Accompanying drawing explanation

Below in conjunction with accompanying drawing in the description of the specific embodiment of the present invention, the present invention may be better understood, wherein identical label represents identical element, wherein:

Fig. 1 illustrates the main process of cell initial search;

Fig. 2 illustrates the structure of a typical radio frames in TD-SCDMA system;

Fig. 3 shows the brief block diagram of TD-SCDMA wireless communication system;

Fig. 4 shows the brief block diagram of the concrete structure of the subscriber equipment shown in Fig. 3;

Fig. 5 illustrates the block diagram of downlink synchronization device according to a first embodiment of the present invention;

Fig. 6 illustrates the flow chart of down link synchronisation method according to a first embodiment of the present invention;

Fig. 7 illustrates a kind of flow chart determining the concrete grammar of frequency priority;

Fig. 8 illustrates the block diagram of downlink synchronization device according to a second embodiment of the present invention;

Fig. 9 illustrates the flow chart of down link synchronisation method according to a second embodiment of the present invention;

Figure 10 illustrates the block diagram of downlink synchronization device according to a third embodiment of the present invention; And

Figure 11 illustrates the flow chart of down link synchronisation method according to a third embodiment of the present invention.

Embodiment

The characteristic sum exemplary embodiment of various aspects of the present invention will be described in detail below.In the following detailed description, propose many details, to provide complete understanding of the present invention.But, it will be apparent to those skilled in the art that the present invention can be implemented when not needing some details in these details.Below the description of embodiment is only used to by illustrating example of the present invention to provide to better understanding of the present invention.Any concrete configuration that the present invention proposes below being never limited to and algorithm, but cover any amendment of element, parts and algorithm, replacement and improvement, only otherwise depart from spirit of the present invention.In the the accompanying drawings and the following description, known structure and technology are not shown, to avoid unnecessarily making the present invention fuzzy.

For TD-SCDMA system, embodiments of the invention are described below, but this and do not mean that the present invention is only confined to for this communication system, on the contrary, the present invention also extends to other and utilizes pilot time slot or the synchronous communication system of pilot code.

Fig. 3 shows the brief block diagram of TD-SCDMA wireless communication system.As shown in Figure 3, this wireless communication system mainly comprises core net 301, wireless access network 302 and subscriber equipment 303.The audio call of core net 301 mainly in process wireless communication system, data cube computation and exchange, customer position information management, network characteristic and Service control, signaling and user profile transmission mechanism and with the connection of other network and route etc.Wireless access network 302 provides the connection of subscriber equipment and core net, and is responsible for management and the allotment of Radio Resource, comprises base station and radio network controller two category node.Subscriber equipment 303 can be such as mobile phone, personal digital assistant (PDA) or other there is the Portable data processing equipment carrying out the function communicated in TD-SCDMA wireless communication system.

Fig. 4 shows the brief block diagram of the concrete structure of subscriber equipment shown in Fig. 3.As shown in Figure 4, this subscriber equipment mainly comprises: radio-frequency module 401, forming filter 402, synchronization module 403, channel estimation module 404, multipath tracking module 405, activate detection module 406, joint-detection module 407, frequency deviation estimating modules 408, ANR/SNR measurement module 409, demapping (demapping) module 410 and decoder module 411.Radio-frequency module 401 unloads ripple and analog-to-digital conversion process to received analog signal, is input to subordinate so that received analog signal is transformed to baseband digital signal.Forming filter 404, namely root raised cosine filter (SRRC) carries out pulse shaping to baseband digital signal.Synchronization module 403 is configured to make subscriber equipment obtain the synchronizing information of community.If it is unsuccessful that synchronization module 403 obtains cell synchronization information, then the signal having carried out pulse shaping by forming filter 402 is not provided to channel estimation module 404.If synchronization module 403 successfully obtains cell synchronization information, then the signal having carried out pulse shaping by forming filter 402 is then provided to channel estimation module 404.Channel estimation module 404 carries out the channel estimating of multiple community for the training sequence code in the signal after pulse shaping.Multipath tracking module 405 utilizes channel estimation results, determines optimum sampling point, and the multipath window position carrying out each community is followed the tracks of.Activate detection module 406 to be configured to carry out window activation detection and code-division activated detection.The data of joint-detection module 407 to each code channel be aliasing in together carry out certain calculating, obtain the transmission symbol on each code channel.Frequency deviation estimating modules 408 utilizes joint detection results estimated frequency to offset.ANR/SNR measurement module 409 utilizes joint detection results to carry out amplitude and noise ratio (ANR) and signal to noise ratio (SNR) is measured.The symbol transition that joint-detection module exports is that soft bit delivers to decoder module by demapping (demapping) module 410.Decoder module 411 is decoded to the soft bit result exported by De-mapping module, obtains information bit.

The disclosure relates generally to the improvement to synchronization module 403.Should be noted that, although the TD-SCDMA wireless communication system be presented above as shown in Figure 3 and Figure 4 and the configuration example of subscriber equipment, but can recognize, communication system of the present invention and subscriber equipment can be used wherein to be not limited to this concrete example, but the various system and the equipment that need to carry out frequency deviation estimation can be suitable for.

First embodiment

Refer now to Fig. 5 to describe the block diagram of downlink synchronization device according to a first embodiment of the present invention.

As shown in Figure 5, downlink synchronization device 500 according to a first embodiment of the present invention comprises input registration module 501, energy accumulation block 502, correlation energy value determination module 503, energy normalized module 504 and descending synchronous code determination module 505.Input registration module 501 is configured to obtain primary data, and this primary data is made up of the multiple chip of continuous print.Input registration module 501 is the memories be made up of multiple memory cell, stores a data (comprising real data, complex data etc.) in each memory cell.Input registration module 501 can be such memory: when it receives a new data, by stored data shifts position to abandon the oldest data and to store the new data provided.Preferably, inputting registration module 501 is shift registers.Energy accumulation block 502 be configured to the primary data section calculating multiple predetermined length energy and.Energy accumulation block 502 have for store the energy that calculates and one or more memory cell.It is relevant that correlation energy value determination module 503 is configured to that N number of descending synchronous code of system each is carried out slip to primary data respectively, and calculate the energy value of each correlation, obtains N group correlation energy value.Energy normalized module 504 is configured to utilize the energy of primary data section and carry out energy normalized to each group of N group correlation energy value respectively.Descending synchronous code determination module 505 is configured to the N group correlation energy value of utilization through energy normalized to determine the descending synchronous code of community and the position in primary data thereof.At this, N be greater than 1 integer.

Refer now to the idiographic flow that Fig. 6 describes down link synchronisation method 600 according to a first embodiment of the present invention in detail.For convenience of explanation, suppose that this embodiment realizes in TD-SCDMA system, the length of each subframe is such as 6400 chips, and system has 32 descending synchronous codes, and the length of each descending synchronous code is 64 chips.But this embodiment obviously also can realize in other communication systems in non-TD-SCDMA system.

See Fig. 6, the idiographic flow of down link synchronisation method 600 is as follows:

In step S601, input registration module 501 receives one by one chip and stores the primary data be made up of sequential chips that.Should be understood that and also can receive primary data one by one by another equipment chip, then primary data is stored in input registration module 501.Input registration module 501 is mainly configured to storing initial data.In fact, in this specific embodiment, inputting registration module 501 is the memories be made up of 64 memory cell.Namely, in this specific embodiment, the primary data section that registration module 501 is configured to store predetermined length is inputted.Particularly, input registration module 501 receives a new data (such as I+jQ) and stores this new data, the data wherein inputted the earliest are stored in the 63rd memory cell InReg [63] of input registration module 501, and (namely up-to-date) data inputted the latest are stored in the 0th memory cell InReg [0] of input registration module 501.Like this, the data that registration module 501 stores 64 chips received recently are all the time inputted.

When Window has detected the original position of an approximate SyncDL code, continuous 127 (64+63) individual data from the 32nd chip before this original position are defined as primary data, after this, be called relevant to the slip that such primary data is carried out, is correlated with among a small circle.And when Window detection does not detect the original position of approximate SyncDL code, the data of 6463 (6400+63) the individual chip within the scope of a subframe are defined as primary data, after this, be called relevant to the slip that such primary data is carried out, is correlated with on a large scale.It should be noted that to realize relevant to the slip of the descending synchronous code of system, as the data of the usual meeting of primary data many receptions down-going synchronous code length (being 64 chips in the present embodiment)-1=63 chip.That is, primary data can be that 6463 chips are long, or 127 chips are long.But should be understood that 6463 chips mentioned are grown and 127 chip length are only exemplary here, primary data can have can realize relevant random length of sliding.

In step S602, energy accumulation block 502 is by the energy accumulation of each input data to its a storage unit A ccuE_Reg [0].Often receive in input registration module 501 and store a new data, this storage unit A ccuE_Reg [0] is just updated once.Update method is: energy (the i.e. I calculating data in the 0th memory cell InReg [0] of input registration module 501 ²+ Q ²), be designated as E (InReg [0]),

AccuE_Reg[0]＝AccuE_Reg[0]+E(InReg[0])

Namely, according to following equation (1) calculate the primary data section of predetermined length energy and:

$X_i=\underset{k=i}{\overset{i+L-1}{\mathrm{\Σ}}}\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*\mathrm{rx}\_\mathrm{corr}\_{{\mathrm{in}}_k}^H$ (i=1,2 ..., n-63) ... formula (1)

Wherein, X _irepresent i-th data segment energy and, rx_corr_in _krepresent the data of a kth chip, L represents predetermined length, and n represents the sum of chip in primary data, and H represents and grips transposition altogether.At this, the predetermined length represented by L is the length of the SyncDL code of system, is L=64 in the present embodiment.When calculating the 1st primary data section energy and time,

$X_1=\underset{k=1}{\overset{64}{\mathrm{\Σ}}}\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*\mathrm{rx}\_\mathrm{corr}\_{{\mathrm{in}}_k}^H.$

When being correlated with among a small circle, n=127, then will calculate one group of 64 energy and X in step S602 ₁, X ₂, X ₃..., X ₆₄.

In step S603, input registration module 501 judges whether to be filled with 64 data.If be not yet filled with 64 data, then method flow turns back to step S601, and input registration module 501 receives and stores the data of next chip.On the contrary, if be filled with 64 data, then method flow has proceeded to step S604, and in step S604, correlation energy value determination module 503 starts associative operation.

Particularly, in step S604, a SyncDL code of the data and system of 64 chips stored in input registration module 501 is gripped and is multiplied by correlation energy value determination module 503 altogether.

In step S605, correlation energy value determination module 503 adds up 64 and grips the value be multiplied altogether.

In step S606, correlation energy value determination module 503 tries to achieve the energy of relevant accumulated value, obtains correlation energy value.

System descending synchronous code and a primary data section are carried out relevant and calculate the process of correlation energy value by above-mentioned steps S604-S606.Concrete, said process carries out according to following equation (2):

$Y_{i,j}=\underset{k=i}{\overset{i+L-1}{\mathrm{\Σ}}}(\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*\mathrm{Sync}{\mathrm{DL}}_{k,j})*{(\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*\mathrm{Sync}{\mathrm{DL}}_{k,j})}^H$ ... formula (2)

(i＝1，2，...，n-63；j＝1，2，...，N)

Wherein, Y _{i, j}represent the correlation energy value of i-th primary data section and a jth descending synchronous code, rx_corr_in _krepresent the data of a kth chip, SyncDL _{k, j}the data of a kth chip of a jth descending synchronous code of expression system, L represents predetermined length, and n represents the sum of chip in primary data, and H represents and grips transposition altogether.In the present embodiment, predetermined length L=64.When the correlation energy value of the 1st descending synchronous code of computing system and the 1st primary data section,

$Y_{\mathrm{1,1}}=\underset{k=1}{\overset{64}{\mathrm{\Σ}}}(\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*\mathrm{Sync}{\mathrm{Dl}}_{k,1})*{(\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*\mathrm{Sync}{\mathrm{DL}}_{k,1})}^H.$

When being correlated with among a small circle, n=127, then, for the 1st descending synchronous code of system, will obtain one group of 64 correlation energy value Y in step S606 _1,1, Y _2,1, Y _3,1..., Y _64,1.

In step S607, energy normalized module 504 carries out energy normalized by using the value in storage unit A ccuE_Reg [0] energy of the 1st primary data section (namely and) to the correlation energy value obtained in step S606 place.

In the present embodiment, the energy normalized in step S607 is carried out according to following equation (3):

$\mathrm{corr}\_{\mathrm{out}}_{i,j}=Y_{i,j}*(1/X_i)$

$=\frac{\underset{k=i}{\overset{i+L-1}{\mathrm{\Σ}}}(\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*\mathrm{Sync}{\mathrm{DL}}_{k,j})*{(\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*\mathrm{Sync}{\mathrm{DL}}_{k,j})}^H}{\underset{k=i}{\overset{i+L-1}{\mathrm{\Σ}}}\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*\mathrm{rx}\_\mathrm{corr}\_{{\mathrm{in}}_k}^H}$ ... formula (3)

(i＝1，2，...，n-63；j＝1，2，...，N)，

Wherein, corr_out _{i, j}represent the correlation energy value through energy normalized of i-th primary data section and a jth descending synchronous code, Y _{i, j}represent the correlation energy value of i-th primary data section and a jth descending synchronous code, X _irepresent i-th data segment energy and, n represents the sum of chip in primary data, and H represents and grips transposition altogether.In the present embodiment, predetermined length L=64.When the energy normalized correlation energy value of the 1st descending synchronous code of computing system and the 1st primary data section,

$\mathrm{corr}\_{\mathrm{out}}_{\mathrm{1,1}}=Y_{\mathrm{1,1}}*(1/X_1)$

$=\frac{\underset{k=1}{\overset{64}{\mathrm{\Σ}}}(\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*\mathrm{Sync}{\mathrm{DL}}_{k,1})*{(\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*\mathrm{Sync}{\mathrm{DL}}_{k,1})}^H}{\underset{k=1}{\overset{64}{\mathrm{\Σ}}}\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*\mathrm{rx}\_\mathrm{corr}\_{{\mathrm{in}}_k}^H}.$

When being correlated with among a small circle, n=127, for the 1st SyncDL code of system, then in step S607 place, energy normalized module 504 utilizes one group of 64 energy and X of calculating in step S602 ₁, X ₂, X ₃..., X ₆₄respectively to one group of 64 the correlation energy value Y calculated in step S606 _1,1, Y _2,1, Y _3,1..., Y _64,1carry out energy normalized.When being correlated with among a small circle, n=127, for 32 SyncDL codes of system, then in step S607 place, energy normalized module 504 utilizes the one group of energy and (X that calculate in step S602 ₁, X ₂, X ₃..., X ₆₄) respectively to the 32 groups of correlation energy value (Y calculated in step S606 _1,1, Y _2,1, Y _3,1..., Y _64,1), (Y _1,2, Y _2,2, Y _3,2..., Y _64,2) ..., (Y _1,32, Y _2,32, Y _3,32..., Y _64,32) each group carry out energy normalized.

In step S608, energy normalized module 504 writes in output buffer after moving to right r position through the correlation energy value of energy normalized, for descending synchronous code and the position in input data thereof of carrying out analyzing to draw Target cell later.At this, r depends on the requirement wide to outputs data bits.

In step S609, energy normalized module 504 judges whether that all to system descending synchronous codes all perform step S604-step S608.If not, then method flow proceeds to step S604, and the next SyncDL code of the data and system of 64 chips stored in input registration module 501 is gripped and is multiplied by correlation energy value determination module 503 altogether.If so, then method flow proceeds to step S610.

In step S610, the energy of the data (being namely stored in the data in the 63rd memory cell InReg [63] of input registration module 501) of wherein oldest stored deducts by input registration module 501 from storage unit A ccuE_Reg [0].Concrete grammar is: the data calculating oldest stored, energy (the i.e. I of the data namely in InReg [63] ²+ Q ²), be designated as E (InReg [63]),

AccuE_Reg[0]＝AccuE_Reg[0]-E(InReg[63])。

In step S611, input registration module 501 judges whether primary data terminates.If not, then method flow proceeds to step S601, continues to perform step S601-S610 to next chip data of primary data.If so, then method flow proceeds to step S612.

In step S612, descending synchronous code determination module 505 utilizes N group correlation energy value through energy normalized to determine the descending synchronous code of Target cell and the position in primary data thereof.This step will be described in further detail below.Then, terminate according to the down link synchronisation method 600 of the first embodiment of the present invention.

So far, by downlink synchronization device according to a first embodiment of the present invention, achieve down link synchronisation method according to a first embodiment of the present invention.

Next, a concrete example of said method 600 is provided to help deep understanding according to the down link synchronisation method of the first embodiment of the present invention.

In this example, Window detects from a subframe, detects 1 approximate SyncDL original position, in the scope of 31 chips afterwards, the data of 64 chips are got successively from 32 chips before this apparent position, and to obtain in subframes back to back 63 chip data after these 64 chip data more, the data of these 127 chips are altogether performed down link synchronisation method 600 as primary data.

In step S601, input registration module 501 receives one by one chip and stores the long primary data of these 127 chips.

In step S602, energy accumulation block 502 by the energy accumulation of each input data in an one storage unit A ccuE_Reg [0].

Suppose in step S603, input registration module 501 judges to have input 64 complex datas, is designated as [(I ₀, Q ₀), (I ₁, Q ₁) ..., (I ₆₃, Q ₆₃)], so now, length cumulative in energy accumulation block 502 is the energy of the 1st primary data section of 64 chips and is $X_1=\underset{k=0}{\overset{63}{\mathrm{\Σ}}}({I_k}^2+{Q_k}^2),$ And method proceeds to step S604.

In step S604, a SyncDL code of the data and system of 64 chips of storage in input registration module 501 (is such as [(Ic by correlation energy value determination module 503 ₀, Qc ₀), (Ic ₁, Qc ₁) ..., (Ic ₆₃, Qc ₆₃)]) grip altogether and be multiplied, obtain sequence:

[(I ₀Ic ₀+Q ₀Qc ₀，Ic ₀Q ₀-I ₀Qc ₀)，

(I ₁Ic ₁+Q ₁Qc ₁，Ic ₁Q ₁-I ₁Qc ₁)，

...，

(I ₆₃Ic ₆₃+Q ₆₃Qc ₆₃，Ic ₆₃Q ₆₃-I ₆₃Qc ₆₃)]。

In step S605, cumulative 64 of correlation energy value determination module 503 is gripped the value be multiplied altogether and is obtained:

$\mathrm{AccuC}=\underset{k=0}{\overset{63}{\mathrm{\Σ}}}(I_k{\mathrm{Ic}}_k+Q_k{\mathrm{Qc}}_k,{\mathrm{Ic}}_k{Q}_k-I_k{\mathrm{Qc}}_k).$

In step S606, correlation energy value determination module 503 tries to achieve the energy of relevant accumulated value, obtains correlation energy value:

Y _1，1＝real(AccuC) ²+imag(AccuC) ²。

In step S607, energy normalized module 504 carries out energy normalized according to following formula:

corr_out _1，1＝Y _1，1*(1/X ₁)

In step S608, the value corr_out that correlation energy value determination module 503 will obtain through energy normalized _1,1write output buffer.

In step S609, suppose all to perform step S604-step S608 to 32 SyncDL codes of system, so obtain corr_out _1,1, corr_out _1,2, corr_out _1,3..., corr_out _1,32.

In step S610, input registration module 501 by the energy of data in its 63rd memory cell InReg [63] from energy and X ₁in deduct.

In step S611, input registration module 501 judges that primary data not yet terminates, and so method flow returns step S601, and in step S601 place, input registration module 501 receives and stores the data of next chip, thus obtains the 2nd primary data section.Then perform step S601-step S611 successively, obtain corr_out _2,1, corr_out _2,2..., corr_out _2,32.

At the end of judging that primary data in step S611 place, for each SyncDL code of system, all having performed slides for 64 times is correlated with.Obtain 32 groups of following correlation energy value through energy normalized:

[corr_out _1，1，corr_out _2，1，...，corr_out _64，1]；

[corr_out _1，2，corr_out _2，2，...，corr_out _64，2]；

...，

[corr_out _1，32，corr_out _2，32，...，corr_out _64，32]，

Wherein, corr_out _{i, j}represent the correlation energy value through energy normalized of i-th primary data section and a jth descending synchronous code.

In step S612, descending synchronous code determination module 505 determines the descending synchronous code of Target cell and the position in primary data thereof based on above-mentioned 32 groups of correlation energy value through energy normalized.This step will be described in further detail below.Then, terminate according to the down link synchronisation method of this concrete example.

Down link synchronisation method according to a first embodiment of the present invention and device, relevant by carrying out energy normalized to primary data and the descending synchronous code of system, eliminate carry out the primary data of being correlated with energy size on the impact of correlated results, thus improve the accuracy in detection to system descending synchronous code.

In the first embodiment of the present invention, can also based on the frequency priority of cell initial search, deciding primary data is data within the scope of the determination obtained after Window detects in a subframe or the data within the scope of a subframe.Namely, can, based on the frequency priority of cell initial search, decide to be correlated with on a large scale or to be correlated with among a small circle.According to the frequency priority of Cell searching, frequency can be divided three classes: category-A, category-B and C class (priority reduces successively).Frequency priority can be determined according to any known prior art.Particularly, The present invention gives a kind of concrete grammar determining frequency priority, as shown in Figure 7.

For category-A frequency, first do and be correlated with among a small circle, if relevant failed α time among a small circle, then do in whole subframe and be correlated with on a large scale.If relevant failed β time, then abandon this frequency on a large scale, go to the search of next frequency.

For category-B frequency, only need do and be correlated with among a small circle, if relevant failed α time among a small circle, then abandon this frequency, go to the search of next frequency.

For C class frequency, only need do in whole subframe and be correlated with on a large scale, if relevant failed β time, then abandon this frequency on a large scale, go to the search of next frequency.

Here, α and β be as required and setting positive integer.

In addition, in the first embodiment of the present invention, in step S608, energy normalized module 504 writes in output buffer after moving to right r position through the correlation energy value of energy normalized, for descending synchronous code and the position in input data thereof of carrying out analyzing to draw Target cell later.Below describe descending synchronous code and the position in input data thereof of how determining Target cell according to the energy normalized correlation energy value exported in detail.

First, perform step S601-S611 as above to a continuous print K subframe, in this K >=1, more large search accuracy is higher for K, and correspondingly search speed is slower.Secondly, merge cumulative for the 32 groups of correlation energy value through energy normalized obtained for each subframe, obtain 32 groups of correlation energy accumulated values.Then, from each group of 32 groups of correlation energy accumulated values, find out maximum, the position of record maximum, such as, suppose that the maximum in first group is the 5th element, i.e. corr_out _5,1, and these 32 maximums are sorted.Then, predetermined threshold is determined.In the first embodiment of the invention, adopt the maximum of the following two kinds threshold value as predetermined threshold: threshold value 1 can be certain fixing value of a setting, threshold value 2 can be that the mean value of k value less in 32 maximums takes advantage of weights again.Finally, adjudicate according to predetermined threshold, if there is the maximum being greater than predetermined threshold, so determine that the descending synchronous code corresponding with this maximum is the SyncDL code of Target cell, and determine the position of SyncDL code in primary data of Target cell based on the position of this maximum.Such as, there is the maximum c orr_out being greater than predetermined threshold _5,1so first SyncDL code of certainty annuity is the descending synchronous code of Target cell, and from primary data from left to right the 5th chip be the position at this SyncDL code place to the scope of the 68th chip, namely, primary data from left to right the 5th chip is the original position of this SyncDL code.

Second embodiment

In order to alleviate the impact of frequency deviation on correlated performance, adopt part correlation technique according to a second embodiment of the present invention.

Fig. 8 illustrates the block diagram of downlink synchronization device 800 according to a second embodiment of the present invention.

Except energy accumulation block 802, correlation energy value determination module 803, energy normalized module 804, shown in the configuration of the downlink synchronization device shown in Fig. 8 and Fig. 5, the configuration of downlink synchronization device is similar.In this embodiment, for convenience of description, situation primary data section and descending synchronous code being divided into four sections is schematically illustrated.However, it should be understood that and in any suitable manner primary data section and descending synchronous code can be divided into any suitably multiple sections.

In energy accumulation block 802, the primary data section of predetermined length is divided into four sections, then the energy of data obtains energy and X1, X2, X3 and X4 of four segment datas in each section cumulative respectively, and the energy of this four segment data and X1, X2, X3 and X4 are outputted to energy normalized module 804.Simultaneously, in correlation energy value determination module 803, descending synchronous code is also divided into four sections and carries out relevant to the primary data section through dividing, and try to achieve the energy value of each correlation, obtain each section of four segment datas and correlation energy value Y1, Y2, Y3 and Y4 of each section of descending synchronous code, then the correlation energy value obtained is outputted to energy normalized module 804.In energy normalized module 804, utilize the energy that exports from energy accumulation block 802 and X1, X2, X3 and X4 to come to carry out energy normalized to correlation energy value Y1, Y2, Y3 and Y4 of exporting from correlation energy value determination module 803 respectively, and four correlation energy value through energy normalized that add up obtain Corr_out and are then outputted to descending synchronous code determination module 505.

The part correlation technique 900 realized by downlink synchronization device 800 shown in Figure 9.Fig. 9 exemplarily illustrates situation primary data section and system SyncDL code being all divided into four sections, but should understand, also the mode of non-decile can be adopted to be divided into any number of sections, as long as divide primary data section and system SyncDL code in an identical manner.According to following formula, primary data section and system SyncDL code are divided into four sections:

part_corr_in _k＝rx_corr_in((k-1)*L/4+1:k*L/4)k＝1，2，3，4；

part_SyncDL _k＝SyncDL((k-1)*L/4+1:k*L/4)k＝1，2，3，4，

At this, L represents predetermined length, i.e. the length of system SyncDL code.When TD-SCDMA system, L=64.

Step S901 is identical with step S601, does not repeat them here.

In step S902, the energy of primary data section is added to its four storage unit A ccuE_Reg [0] by energy accumulation block 802 respectively, AccuE_Reg [1], in AccuE_Reg [2] and AccuE_Reg [3], namely, by the energy accumulation of 1-16 chip data in a primary data section in first storage unit A ccuE_Reg [0], by the energy accumulation of 17-32 chip data in second storage unit A ccuE_Reg [1], by the energy accumulation of 33-48 chip data in the 3rd storage unit A ccuE_Reg [2], and by the energy accumulation of 49-64 chip data in the 4th storage unit A ccuE_Reg [3].

In step S903, input registration module 501 judges whether to be filled with 64 data.If be not yet filled with 64 data, then method flow turns back to step S901, is received and the next chip data of storing initial data by input registration module 501.On the contrary, if be filled with 64 data, then method flow has proceeded to step S904, in step S904, and correlation energy value determination module 803 actuating section associative operation.

Particularly, in step S904, a SyncDL code of the data and system of 64 chips stored in input registration module 501 is gripped and is multiplied by correlation energy value determination module 803 altogether.More specifically, the data of 1-16 chip in the data and system descending synchronous code of a primary data Duan Zhong 1-16 chip are gripped and are multiplied by correlation energy value determination module 803 altogether; The data of 17-32 chip in the data and system descending synchronous code of a primary data Duan Zhong 17-32 chip are gripped altogether and is multiplied; The data of 33-48 chip in the data and system descending synchronous code of a primary data Duan Zhong 33-48 chip are gripped altogether and is multiplied, and the data of 49-64 chip in the data and system descending synchronous code of a primary data Duan Zhong 49-64 chip are gripped altogether be multiplied.

In step S905, in cumulative one section of correlation energy value determination module 803, grip the value be multiplied altogether for 16.

In step S906, correlation energy value determination module 803 tries to achieve the energy of relevant accumulated value in this section, obtains the correlation energy value of this section.

In step S907, energy normalized module 804 carries out energy normalized by using the value in storage unit A ccuE_Reg [0] to the correlation energy value obtained in step S906 place.

In step S908, the correlation energy value through energy normalized of this segment data is added in cumulative correlation energy value by energy normalized module 804.

In step S909, energy normalized module 804 judges whether all to perform step S905-step S908 to through dividing four segment datas obtained.If not, then method flow turns back to step S905, and correlation energy value determination module 803 16 of adding up in next section grip the value be multiplied altogether.If so, then method flow proceeds to step S910.

In step S910, energy normalized module 804 writes in output buffer after moving to right r position through cumulative correlation energy value, for descending synchronous code and the position in input data thereof of carrying out analyzing to draw Target cell later.At this, r depends on the requirement wide to outputs data bits.

In step S911, energy normalized module 804 judges whether that all to system descending synchronous codes perform step S904-step S910.If not, then method flow proceeds to step S904, and the next SyncDL code of the data and system of 64 chips stored in input registration module 501 is gripped and is multiplied by correlation energy value determination module 803 altogether.If so, then method flow proceeds to step S912.

In step S912, the energy of data the earliest (namely inputting the data in memory cell InReg [16], the InReg [32] of registration module 501, InReg [48] and InReg [64]) in the four sections of input data stored in input registration module 501 is deducted respectively from the storage unit A ccuE_Reg of energy accumulation block 802 [0], AccuE_Reg [1], AccuE_Reg [2] and AccuE_Reg [0].

In step S913, input registration module 501 judges whether primary data terminates.If not, then method flow proceeds to step S901, continues to perform step S901-S912 to next chip data of primary data.If so, then method proceeds to step S914.

In step S914, descending synchronous code determination module 505 determines the descending synchronous code of Target cell and the position in primary data thereof.The concrete operations of this step are specifically explained hereinbefore, do not repeat them here.

So far, by downlink synchronization device according to a second embodiment of the present invention, achieve down link synchronisation method according to a second embodiment of the present invention.By the method and apparatus of the second embodiment, alleviate the impact of frequency deviation on correlated performance.

3rd embodiment

Noticing needs to carry out division arithmetic according in the method 600 and 900 of the present invention first and second embodiment above-mentioned.Consider that the complexity of division in DSP realizes is very large, generally obtain the inverse of denominator by tabling look-up, then it being multiplied with molecule realizes division.

But, due to denominator in above-mentioned energy normalized step be primary data section energy and, so according to the difference of primary data, the dynamic range of denominator is very large.Such as, if the real part of input data and imaginary part are the data of 12 bits, then the number range of its energy accumulation value is between 1 bit to 30 bits.If directly look into reciprocal table, need very many list items.And bit wide is that the denotable minimum precision of reciprocal value of m bit only has 2 ^-m, in order to ensure that its inverse also has certain precision when denominator is very large, need larger bit wide to represent reciprocal value.From these two aspects, direct reciprocal table needs to take very large memory space, and realizability is poor.

In view of the above problems, the third embodiment of the present invention realizes division by displacement look-up table.For the ease of understanding, in this embodiment, suppose that the input real part of data and imaginary part are the data of 12 bits.

Figure 10 illustrates the block diagram of downlink synchronization device 1000 according to a third embodiment of the present invention.

Except in Fig. 10 with scaling round module 1001, look into reciprocal table module 1002, multiplier module 1003 and accumulator module 1004 instead of except the energy normalized module 804 in Fig. 8, shown in the configuration of the downlink synchronization device 1000 shown in Figure 10 and Fig. 8, the configuration of downlink synchronization device 800 is similar.In this embodiment, for convenience of description, situation primary data section and descending synchronous code being divided into four sections is schematically illustrated.However, it should be understood that and in any suitable manner primary data section and descending synchronous code can be divided into any suitably multiple sections.

As shown in Figure 10, scaling rounds module 1001, looks into reciprocal table module 1002, multiplier module 1003 and accumulator module 1004 are configured to the every one piece of data by using four segment datas through dividing i-th data segment obtained energy and X1, X2, X3 and X4, and every one piece of data through dividing four segment datas of i-th data segment obtained with through dividing correlation energy value Y1, Y2, Y3 and Y4 of every one piece of data of four segment datas of the jth descending synchronous code obtained, utilize the look-up table that is shifted to perform energy normalized and operate.

Particularly, scaling rounds module 1001 and is configured to energy and X1 (X2, X3 or X4) zoom in or out Z doubly and round obtain X1 ' (X2 ', X3 ' or X4 ') with make X1 ' (X2 ', X3 ' or X4 ') size within the scope of predetermined value, then by correlation energy value Y1 (Y2, Y3 or Y4) zoom in or out identical Z doubly and round obtain Y1 ' (Y2 ', Y3 ' or Y4 '), and by obtained X1 ' (X2 ', X3 ' or X4 ') be supplied to and look into reciprocal table module 1002, by obtained Y1 ' (Y2 ', Y3 ' or Y4 ') be supplied to multiplier module 1003.At this, Z be more than or equal to 1 integer.

In the present embodiment, can realize zooming in or out and the operation rounded by shifting function.As described above, store input data segment energy and input registration module 501 can be shift register.When to input registration module 501 are shift registers, energy and X1 moved to right one, and give up unnecessary a data, so this energy and X1 reduced to about 2 ^-1=1/2.And for example, energy and X1 are moved to left two, and two the position zero paddings that will vacate, so this energy and X1 are exaggerated 2 ²=4 times.In addition, can by control primary data section after scaling energy and bit wide control its number range.Such as, can zoom in or out energy and X1 and round to make its bit wide be P (P be greater than 1 integer) bit, thus make its size within the scope of predetermined value.

Look into reciprocal table module 1002 to be configured to using X1 ' (X2 ', X3 ' or X4 ') as index to search reciprocal table to obtain 1/X1 ' (1/X2 ', 1/X3 ' or 1/X4 ').

Multiplier module 1003 is configured to Y1 ' (Y2 ', Y3 ' or Y4 ') and 1/X1 ' (1/X2 ', 1/X3 ' or 1/X4 ') to be multiplied by mutually and product Y1 '/X1 ' (Y2 '/X2 ', Y3 '/X3 ' and Y3 '/X4 ') is supplied to accumulator module 1004.

Accumulator module 1004 is configured to the cumulative value exported from multiplier module 1003.

It should be noted that accumulator module 1004 is not required, when not adopting part correlation technique, accumulator module 1004 can be omitted.Such as, also can be combined in the downlink synchronization device 500 shown in Fig. 5 for the multiple modules of tabling look-up that realize being shifted shown in Figure 10.Namely, module 1001 can be rounded with scaling, look into the energy normalized module 504 that reciprocal table module 1002 and multiplier module 1003 come in alternate figures 5.Now, scaling rounds module 1001 and is configured to the energy of i-th data segment and X _izoom in or out Z times and round and obtain X _i' to make this X _i' size within the scope of predetermined value, (such as, make this X _i' bit wide be P), then by the correlation energy value Y of i-th primary data section and a jth descending synchronous code _{i, j}zoom in or out identical Z times and round and obtain Y _{i, j}', wherein Z be more than or equal to 1 integer.Look into reciprocal table module 1002 to be configured to X _i' search reciprocal table to obtain 1/X as index _i'.And multiplier module 1003 is configured to Y _{i, j}' and 1/X _i' being multiplied obtains the correlation energy value corr_out through energy normalized of i-th primary data section and a jth descending synchronous code _{i, j}.

It should be noted that the Y be incorporated herein _{i, j}'/X _i' owing to reducing in process the step that exists and round so and inaccuracy equals Y _{i, j}/ X _i, but, facts have proved that such slight error can't cause the erroneous judgement to descending synchronous code and position thereof.Preferably, X is selected _i' bit wide be 8 bits.Below with the energy after scaling and X _i' bit wide be the preferred embodiment of 8 bits be example, down link synchronisation method is according to a third embodiment of the present invention described.

Below by way of the down link synchronisation method 1100 described in detail with reference to Figure 11 according to a third embodiment of the present invention, apply displacement look-up table in the method.Except step S1101-S1104 in Figure 11, other steps in Figure 11 are identical with the method step in Fig. 9, do not repeat them here.

Down link synchronisation method 1100 performs step S1101-S1104 similarly to the energy stored in four storage unit A ccuE_Reg [0] of energy accumulation block 802, AccuE_Reg [1], AccuE_Reg [2] and AccuE_Reg [3] and X1, X2, X3 and X4 and corresponding correlation energy value Y1, Y2, Y3 and Y4 respectively.Below, for the step S1101-S1104 performed energy and X1 and correlation energy value Y1, step S1101-S1104 is described in detail.

In step S1101, scaling rounds module 1001 and the energy in the storage unit A ccuE_Reg [0] of energy accumulation block 802 and X1 to be shifted M-bit round and make its highest significant position on the 8th bit, thus obtains X1 '.Positive integer at this M.Like this, the energy in the storage unit A ccuE_Reg [0] of energy accumulation block 802 and X1 are exaggerated or reduce Z doubly, at this Z=2 ^m.

In step S1102, look into reciprocal table module 1002 with displacement after 8 Bit datas low 7 as index, look into reciprocal table and obtain 9 bit values.

In step S1103, scaling rounds module 1001 and to be shifted in an identical manner by correlation energy value Y1 identical M-bit round and obtain Y1 '.Like this, correlation energy value Y1 is exaggerated or reduces identical Z doubly, at this Z=2 ^m.

In step S1104, the value obtained from step S1101 is multiplied with the value obtained from step S1103 by multiplier module 1003, obtains the correlation energy value through energy normalized.

In this embodiment, the M-bit that energy and X1 is shifted makes its highest significant position on the 8th bit.But should be understood that the M-bit that energy and X1 can be shifted makes on its highest significant position arbitrary bit on the 9th bit, on the 7th bit or as required.

Can find out, the M position that is shifted by denominator makes its highest significant position be fixed on the 8th bit, and the number range of such denominator is limited between 0x10 to 0xff, thus only needs 2 ^n-1=2 ⁷=128 list items just can represent all denominators, and list item quantity greatly reduces.Meanwhile, because larger denominator has been moved to right when tabling look-up M position, same m bit reciprocal value can express 2 ^(-m-M)such precision, therefore substantially reduces the bit wide expressed reciprocal value and need, thus reduces shared memory space.As in this example, for 12 bit input data, reciprocal table bit wide only needs 9 bits.

Realize division by displacement look-up table, can memory space be saved, improve energy normalized relevant speed, there is good realizability.

Although clearly do not illustrate, the displacement look-up method shown in Figure 11 also may be used for the down link synchronisation method 600 in Fig. 6, in order to realize energy normalized step wherein.In addition, can also with in dsp to realize division in other occasions at this displacement look-up table proposed.

Incidentally, each module shown in Fig. 5, Fig. 8 and Figure 10 can use the hardware of pre-programmed or firmware components (such as, application-specific integrated circuit (ASIC) (ASIC)) realize, also can use and comprise erasable removing and the data processing equipment of programmable read-only memory (EEPROM) or the realization of other concerned components.In addition, software or the code that can be performed to realize by processor corresponding calculating or function is also can be implemented as according to method of the present invention and module.

It will be understood by those skilled in the art that the more Alternate embodiments and the improved procedure that also exist and can be used in the present invention embodiment, and above-mentioned execution mode and example are only the explanations of one or more embodiment.Therefore, scope of the present invention is only limited by appended claims.

Claims (16)

1., for a down link synchronisation method for communication system, comprise the following steps:

A. obtain primary data and calculate the primary data section of multiple predetermined length energy and;

B. N number of descending synchronous code of system each is carried out slip to described primary data section respectively relevant, and calculates the energy value of each correlation, obtain N group correlation energy value, wherein, N be greater than 1 integer;

C. utilize the energy of described multiple primary data section and respectively energy normalized carried out to each group of described N group correlation energy value; And

D. utilize N group correlation energy value through energy normalized to determine the descending synchronous code of Target cell and the position in described primary data thereof.

2. down link synchronisation method according to claim 1, wherein based on the frequency priority of cell initial search, deciding described primary data is data after Window detects within the scope of the determination that obtains in a subframe or the data within the scope of a subframe.

3. down link synchronisation method according to claim 1, wherein said steps d comprises:

Described step a, b and c are performed successively to K subframe, the N group correlation energy value obtained for each subframe are added up, obtain N group correlation energy accumulated value, wherein K be more than or equal to 1 integer;

Organize described correlation energy accumulated value from each and detect maximum to obtain N number of maximum, and record the position of each maximum; And

Descending synchronous code corresponding to the maximum being greater than predetermined threshold is defined as the descending synchronous code of Target cell, and determines the position of the descending synchronous code of described Target cell in described primary data based on the position of the maximum being greater than described predetermined threshold.

4. down link synchronisation method according to claim 1, wherein calculates energy and the X of the primary data section of described multiple predetermined length according to following formula _i:

$X_i=\underset{k=i}{\overset{l+L-1}{\mathrm{\Σ}}}\mathrm{rx}\_\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*{\mathrm{in}}_k*\mathrm{rx}\_\mathrm{corr}\_{{\mathrm{in}}_k}^H,i=\mathrm{1,2},\·\·\·,n-63$

Wherein, X _irepresent i-th data segment of described multiple primary data section energy and, rx_corr_in _krepresent the data of a kth chip of described primary data, L represents described predetermined length, and n represents the sum of chip in described primary data, and H represents and grips transposition altogether.

5. down link synchronisation method according to claim 1, wherein calculates described N group correlation energy value Y according to following formula _{i, j}:

$\begin{array}{c}{Y}_{i,j}=\underset{k=i}{\overset{l+L-1}{\mathrm{\Σ}}}(\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*{\mathrm{SyncDL}}_{k,j})*{(\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*{\mathrm{SyncDL}}_{k,j})}^H,\\ i=\mathrm{1,2},\·\·\·n-63;j=\mathrm{1,2},\·\·\·,N\end{array}$

Wherein, Y _{i, i}represent the correlation energy value of i-th primary data section and a jth descending synchronous code, rx_corr_in _krepresent the data of a kth chip of described primary data, SyncDL _{k, j}the data of a kth chip of a jth descending synchronous code of expression system, L represents described predetermined length, and n represents the sum of chip in described primary data, and H represents and grips transposition altogether.

6. down link synchronisation method according to claim 1, wherein carries out the step of described energy normalized according to following formula:

$\begin{array}{c}\mathrm{corr}\_{\mathrm{out}}_{i,j}=Y_{i,j}*(1/X_i)\\ =\frac{\underset{k=i}{\overset{l+L-1}{\mathrm{\Σ}}}(\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*{\mathrm{SyncDL}}_{k,j})*{(\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*{\mathrm{SyncDL}}_{k,j})}^H}{\underset{k=i}{\overset{l+L-1}{\mathrm{\Σ}}}\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*\mathrm{rx}\_\mathrm{corr}\_{{\mathrm{in}}_k}^H}\\ i=\mathrm{1,2},\·\·\·,n-63;j=\mathrm{1,2},\·\·\·,N\end{array}$

Wherein, corr_out _ijrepresent the correlation energy value through energy normalized of i-th primary data section and a jth descending synchronous code, Y _ijrepresent the correlation energy value of i-th primary data section and a jth descending synchronous code, X _irepresent i-th data segment of described multiple primary data section energy and, n represents the sum of chip in described primary data, and H represents and grips transposition altogether.

7. down link synchronisation method according to claim 6, wherein i-th primary data section and a jth descending synchronous code are carried out energy normalized and in an identical manner described i-th primary data section and a described jth descending synchronous code are divided into Q section relevant comprising, and according to following formula carry out described energy normalized be correlated with:

$\begin{array}{c}\mathrm{corr}\_{\mathrm{out}}_{i,j}\\ =\underset{q=1}{\overset{Q}{\mathrm{\Σ}}}\frac{(\mathrm{part}\_\mathrm{corr}\_{\mathrm{in}}_q*\mathrm{part}\_{{\mathrm{SyncDL}}_q}^H)*{(\mathrm{part}\_\mathrm{corr}\_{\mathrm{in}}_q*\mathrm{part}\_{{\mathrm{SyncDL}}_q}^H)}^H}{\mathrm{part}\_\mathrm{corr}\_{\mathrm{in}}_q*\mathrm{part}\_\mathrm{corr}\_{{\mathrm{in}}_q}^H}\end{array}$

Wherein, part_corr_in _qthe q section of described i-th primary data section, part_SyncDL _qthe q section of a described jth descending synchronous code, and Q be greater than 1 integer.

8. down link synchronisation method according to claim 6, wherein calculates described corr_out _{i, j}comprise the following steps:

By described X _izoom in or out Z times and round and obtain X _i' to make described X _i' size within the scope of predetermined value, wherein Z be more than or equal to 1 integer;

By described Y _{i, j}zoom in or out described Z times and round and obtain Y _{i, j}';

With described X _i' search reciprocal table to obtain 1/X as index _i'; And

By described Y _i,j' and described 1/X _i' being multiplied obtains described corr_out _i,j.

9., for a downlink synchronization device for communication system, comprising:

Input registration module, is configured to storing initial data;

Energy accumulation block, is configured to the energy of each data segment of the primary data section of cumulative multiple predetermined length;

Correlation energy value determination module, is configured to that N number of descending synchronous code of system each is carried out slip to described primary data section respectively relevant, and calculates the energy value of each correlation, obtain N group correlation energy value, wherein N be greater than 1 integer;

Energy normalized module, is configured to utilize the energy of described multiple primary data section and carry out energy normalized to each group of N group correlation energy value respectively; And

Descending synchronous code determination module, is configured to the N group correlation energy value of utilization through energy normalized to determine the descending synchronous code of Target cell and the position in described primary data thereof.

10. downlink synchronization device according to claim 9, wherein said descending synchronous code determination module comprises:

Accumulator module, is configured to the cumulative N group correlation energy value obtained for each subframe of K subframe to obtain N group correlation energy accumulated value, wherein K be more than or equal to 1 integer;

Maximum check-out module, is configured to organize described correlation energy accumulated value from each detect maximum to obtain N number of maximum, and records the position of each maximum; And

Judging module, be configured to the descending synchronous code descending synchronous code corresponding to the maximum being greater than predetermined threshold being defined as Target cell, and determine the position of the descending synchronous code of described Target cell in described primary data based on the position of the maximum being greater than described predetermined threshold.

11. downlink synchronization devices according to claim 9, wherein said energy accumulation block calculates energy and the X of the primary data section of described multiple predetermined length according to following formula _i:

$X_i=\underset{k=i}{\overset{l+L-1}{\mathrm{\Σ}}}\mathrm{rx}\_\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*{\mathrm{in}}_k*\mathrm{rx}\_\mathrm{corr}\_{{\mathrm{in}}_k}^H,i=\mathrm{1,2},\·\·\·,n-63$

Wherein, X _irepresent i-th data segment of described multiple primary data section energy and, rx_corr_in _krepresent the data of a kth chip of described primary data, L represents described predetermined length, and n represents the sum of chip in described primary data, and H represents and grips transposition altogether.

12. downlink synchronization devices according to claim 9, wherein said correlation energy value determination module calculates described N group correlation energy value Y according to following formula _i,j:

$\begin{array}{c}{Y}_{i,j}=\underset{k=i}{\overset{l+L-1}{\mathrm{\Σ}}}(\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_{k,j}*{{\mathrm{SyncDL}}_{k,j}}^H)*{(\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_{k,j}*{{\mathrm{SyncDL}}_{k,j}}^H)}^H,\\ i=\mathrm{1,2},\·\·\·n-63;j=\mathrm{1,2},\·\·\·,N\end{array}$

Wherein, Y _{i, j}represent the correlation energy value of i-th primary data section and a jth descending synchronous code, rx_corr_in _krepresent the data of a kth chip of described primary data, SyncDL _k,jthe data of a kth chip of a jth descending synchronous code of expression system, L represents described predetermined length, and n represents the sum of chip in described primary data, and H represents and grips transposition altogether.

13. downlink synchronization devices according to claim 9, wherein said energy normalized module carries out energy normalized according to following formula:

$\begin{array}{c}\mathrm{corr}\_{\mathrm{out}}_{i,j}=Y_{i,j}*(1/X_i)\\ =\frac{\underset{k=i}{\overset{l+L-1}{\mathrm{\Σ}}}(\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*{\mathrm{SyncDL}}_{k,j})*{(\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*{\mathrm{SyncDL}}_{k,j})}^H}{\underset{k=i}{\overset{l+L-1}{\mathrm{\Σ}}}\mathrm{rx}\_\mathrm{corr}\_{\mathrm{in}}_k*\mathrm{rx}\_\mathrm{corr}\_{{\mathrm{in}}_k}^H}\\ i=\mathrm{1,2},\·\·\·,n-63;j=\mathrm{1,2},\·\·\·,N\end{array}$

Wherein, corr_out _{i, j}represent the correlation energy value through energy normalized of i-th primary data section and a jth descending synchronous code, Y _i,jrepresent the correlation energy value of i-th primary data section and a jth descending synchronous code, X _irepresent i-th data segment of described multiple primary data section energy and, n represents the sum of chip in described primary data, and H represents and grips transposition altogether.

14. downlink synchronization devices according to claim 13, wherein in described energy normalized module, i-th primary data section and a jth descending synchronous code are carried out energy normalized and in an identical manner described i-th primary data section and a described jth descending synchronous code are divided into Q section relevant comprising, and according to following formula carry out described energy normalized be correlated with:

$\begin{array}{c}\mathrm{corr}\_{\mathrm{out}}_{i,j}\\ =\underset{q=1}{\overset{Q}{\mathrm{\Σ}}}\frac{(\mathrm{part}\_\mathrm{corr}\_{\mathrm{in}}_q*\mathrm{part}\_{{\mathrm{SyncDL}}_q}^H)*{(\mathrm{part}\_\mathrm{corr}\_{\mathrm{in}}_q*\mathrm{part}\_{{\mathrm{SyncDL}}_q}^H)}^H}{\mathrm{part}\_\mathrm{corr}\_{\mathrm{in}}_q*\mathrm{part}\_\mathrm{corr}\_{{\mathrm{in}}_q}^H}\end{array}$

Wherein, part_corr_in _qthe q section of described i-th primary data section, part_SyncDL _qthe q section of a described jth descending synchronous code, and Q be greater than 1 integer.

15. downlink synchronization devices according to claim 13, wherein said energy normalized module comprises;

Scaling rounds module, is configured to described X _izoom in or out Z times and round and obtain X _i' to make described X _i' size within the scope of predetermined value, then by described Y _ijzoom in or out described Z times and round and obtain Y _i,j', wherein Z be more than or equal to 1 integer;

Look into reciprocal table module, be configured to described X _i' search reciprocal table to obtain 1/X as index _i'; And

Multiplier module, is configured to described Y _ij' and described 1/X _i' being multiplied obtains described corr_out _ij.

16. 1 kinds of communication equipments, comprise as the downlink synchronization device in claim 9 to 15 as described in any one.