Preamble detection method and system

FIELD: radio engineering, communication.

SUBSTANCE: invention discloses, in particular, a method of detecting a preamble, which includes the following: chips of a preamble are divided into a plurality of chip blocks, and correlative accumulation is performed on the plurality of chip blocks to obtain multiple groups of partial products of signature components; compensation of positive frequency offset is performed on each group of the multiple groups of partial products of signature components to obtain multiple groups of compensation results of positive frequency offset, and compensation of negative frequency offset is performed on each group of the multiple groups of partial products of signature components to obtain multiple groups of compensation results of negative frequency offset; coherent accumulation, phase rotation, signature matching and complex modulus calculation, and dual-antenna merging are performed on the multiple groups of compensation results of positive frequency offset, and the coherent accumulation, the phase rotation, the signature matching and the complex modulus calculation, and the dual-antenna merging are performed on the multiple groups of compensation results of negative frequency offset.

EFFECT: high efficiency of detecting preamble in a wideband code division multiple access system.

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AREA of TECHNOLOGY

The description relates to the field of communications and particularly to a method and system for determining the preamble.

Background of the INVENTION

In the system broadband multiple access code division multiplexing (WCDMA) user equipment (UE) accesses the WCDMA system through a physical random access channel (PRACH).

Before the UE accesses the cell of the WCDMA system, the UE must transmit a preamble to the base station through the PRACH. The base station detects the preamble to determine whether the UE requesting access. If the base station does not detect the presence of the UE requesting access, the base station does not transmit indicator (AI) on UE. Then, the UE increases the transmission power of the preamble in accordance with the length of the step denoted by the base station and re-transmits the preamble in the next timeslot distributed access to until the UE will not accept AI from the base station, or the number of times of transmission of the preamble reaches the allowable maximum number, or the transmission power does not exceed the maximum allowable power. If the base station detects that the UE is present requesting access, the base station transmits via AI channel indicator receive (AICH) to notify the UE about the need to transfer messages of lucynovaposted. At this point, the process of detection of the preamble is completed.

Fig.1 shows a block diagram schematic of detection of the preamble in the prior art. As shown in Fig.1, the current detection circuit of the preamble mainly involves performing correlative accumulation, the rotation of the phase compensation of the frequency offset (element resolution frequency), coherent accumulation, approval signatures and non-coherent accumulation on the preamble, successfully using the algorithm integrated the operations of detection of the preamble. Profile of the amplitude delay (ADP) is produced at each point of the discretization. If there are multiple shifts of frequencies, it is necessary to repeat the above operation for each frequency shift.

In the existing scheme of detection of the preamble, the integral operation of detection of the preamble to one of the antenna can be expressed as:

where y(256k+m*Nc+16i+j) represents the basic data of the chip; c*(256k+m*Nc+16i+j) represents the conjugate of the scrambling code value; i is the sequence number of 16-chip data used to diskriminirovaniya (each component of the signature contains 16 chips); inej(π4+π2(256k+/mo> mNc+16i+j))first j is the imaginary unit, and the second j is the ordinal number of the component signatures (each signature contains 16 components signatures); k represents the sequence number of symbols of coherent accumulation; m represents the sequence number of groups involved in non-coherent accumulation, and m=0, 1 ... 4096/Nc-1; feis compensated for frequency offset; Ncis the length of the coherent accumulation; andsnjrepresents the j-th component of n signatures, n=0, 1, ..., 15.

In the actual implementation of the WCDMA system, as a rule, you must choose the number of shifts of frequency and position, based on the number of sectors and the radius of the cell. For the same PRACH, when the detection of the preamble is performed using different shifts of the frequencies used by the preamble and the search box are the same. Under these conditions, the existing scheme of detection of the preamble would cause two problems.

1. Since the rotation of the phases associated with each of 4096 chips, the calculation process is complex, involved in a large number of hardware resources, and the process goes slow�.

2. A number of hardware resources consistently completes the process of detecting the preamble of the frequency shift. When switching to a different frequency offset to perform the detection of the preamble, the operation of choice 4096 chips, a selection operation of the data search window and the result of processing correlative accumulation can not be separated, therefore, it is necessary to perform a lot of repetitive work. A number of hardware resources should be added each time is added to the frequency shift. Therefore, the work efficiency is low.

A brief summary of the invention

Subject to the foregoing, the invention is intended to provide a method and system for the detection of the preamble, which can efficiently perform the detection of the preamble in the WCDMA system.

With this purpose, the technical solutions of the invention are implemented as follows.

The invention provides a method for the detection of the preamble, which includes the stages on which:

chips of the preamble are divided into multiple blocks of chips, and correlative accumulation is performed on the set of blocks of chips to obtain multiple groups of the partial products of the components of the signatures.

compensation of positive frequency shift is performed on each group of the multiple groups of the partial products of the components of the signature to obtain m�austenic groups results compensation of the positive frequency shift, and compensation of the negative frequency shift is performed on multiple groups of the partial products of the components of the signature to obtain multiple groups of results to offset the negative frequency shifts; and

coherent accumulation, rotation phases, approval signatures and the computation of an integral module, and merge the double perform antenna on multiple bands results compensation of the positive frequency shift, and coherent accumulation, rotation phases, approval signatures and the computation of an integral module, and merge the double perform antenna on multiple bands results of compensating the negative frequency shift.

In the method, the stage at which perform compensation of a positive frequency shift for each group of the multiple groups of the partial products of the components of the signature and performs compensation of the negative frequency shift for each group of the multiple groups of the partial products of the components of the signatures may include:

multiplying each group of the partial products of the components of the signatures of the 16 groups of the partial products of the components of the signatures obtained after correlation accumulation values on the compensation of the frequency shift ofej2πfetk andej2π(fe)tkrespectively.

In the method, the stage at which perform coherent accumulation, rotation phases, approval signatures and the computation of an integral module, and the unification of the dual antennas on multiple groups of the results of the compensation of the positive frequency shift and coherent accumulation, phase rotation, approval signatures, and evaluate complex module, and the unification of the dual antennas on multiple groups of results to offset the negative frequency shift, may include:

performing coherent accumulation on the 16th groups of the results of the compensation of the positive frequency offset and performing coherent accumulation on the 16th groups of the results of compensating the negative frequency shift;

performing phase rotation respectively on the results obtained after coherent accumulation, using the ratio of the phase rotation isej(π4+π2j);

responding�notification of approval signatures and evaluate complex module respectively on the result, obtained after phase rotation; and

performing a join dual antenna respectively on the results obtained after approval signatures and evaluate complex module.

In the method, the stage at which perform coherent accumulation on multiple groups of the results of the compensation of the positive frequency shift and perform coherent accumulation on multiple groups of results to offset the negative frequency shift, may include:

performing coherent accumulation of the partial products of the same components of the signatures on the 16th groups of the results of the compensation of the positive frequency shift and perform coherent accumulation of the partial products of the same components of the signatures on the 16th groups of the results of compensating the negative frequency shift; if the length of coherent accumulation of Nc4096, performing coherent accumulation on the 16 partial products of component j of the signatures belonging to the same frequency shift, works the same components of the signatures on the 16th groups of the results of the compensation of the positive frequency shift and perform coherent accumulation of the partial products of the same components of the signatures on the 16th groups of the results of compensating the negative frequency shift; if the length of coherent accumulation of Nc is equal to 2048, the performance of coherent�about savings for the first 8 partial products of component j signature owned by the same frequency shift, and performing coherent accumulation for the last 8 partial products of component j of the signatures belonging to the same frequency offset to output two groups of 16 partial products of the components of the signatures for positive frequency shift and output two groups of 16 partial products of the components of the signatures for negative frequency shift.

In the method, the stage at which perform the rotation phases, respectively, on the results obtained after coherent accumulation may include:

the rotation of the partial products of the components of the signature corresponding to j, on(π4+π2j)degrees in accordance with the value of the sequence number j 16 components of the signature; if the length of coherent accumulation of Ncis 4096, the output of a group of 16 partial products of the components of the signatures for positive frequency shift and the output of a group of 16 partial products of the components of the signatures for negative frequency shifts; if the length of coherent accumulation of Ncequal to 2048, the output of two groups of 16 partial products of the components of the signatures for positive frequency shift and output two groups of 6 partial products of the components of the signatures for negative frequency shift.

In the method, the stage at which perform the approval signatures and complex calculation module respectively on the result obtained after phase rotation may include:

the multiplication result of the rotation phase of the positive frequency shift and phase rotation negative frequency shift, respectively, on the Hadamard matrix:

where rot(15), red(14), ..., rot(0) represent the 16 partial products of the components of the signatures withdrawn after phase rotation; hat(15), hat(14), ..., hat(0) represent the results obtained after approval signatures; andsnjrepresents the j-th component of the signature of n, where n=0, 1, 15, and j=0, 1, 15; and

the calculation you are performing a complex module is the result obtained after approval signatures; if the length of coherent accumulation of Ncis 4096, the output of a group of 16 partial products signatures for positive frequency shift and the output of a group of 16 partial products signatures for negative frequency shifts; if the length of coherent accumulation of Ncequal to 2048, the output of two groups of 16 partial products signatures for positive frequency shift and output two groups of 16 partial products signatures for negative frequency shift.

In a way, this�, which combine dual antenna respectively on the results obtained after approval signatures and evaluate complex module may include:

after approval signatures and complex calculation module, the calculation of the average results from the two antennas, subject to approval signatures, and calculating an integral module in each partial product of the components of the signature; if the length of coherent accumulation of Ncis 4096, the output of a group of 16 partial products signatures for positive frequency shift and the output of a group of 16 partial products signatures for negative frequency shifts; if the length of coherent accumulation of Ncequal to 2048, the output of two groups of 16 partial products signatures for positive frequency shift and output two groups of 16 partial products signatures for negative frequency shift.

In the method, the method may further include: when the length of coherent accumulation of Ncequal to 2048,

performing non-coherent accumulation for the two groups of multiple partial products of signature, with two groups of multiple partial products of signatures obtained by the completion of the unification of dual-antenna for the same frequency shift.

In the method, the stage at which perform some�arentnode accumulation in two groups of multiple partial works signature may include that:

for each positive frequency shift and negative shift in frequency, after approval signatures are present two groups of 16 partial products signature; perform non-coherent accumulation for the two groups of 16 partial products of signatures obtained after combining double antenna for the same frequency shift, the output of a group of 16 profiles of the amplitude delay (ADPs) for positive frequency shift and output the group of 16 ADPs for negative frequency shift.

The method may further include:

calculation of the maximal ADP and the noise data, and the maximum message ADP and the noise data corresponding subsystem.

In the above method, the stage at which calculates the maximum ADP and data about noise and report the maximum ADP data, and the noise of the corresponding subsystem, can include:

the ordering of the ADPs, corresponding to the same signature and the same frequency shift, which is obtained by performing the detection of the preamble at all positions to search the same problem of detection of the preamble, to obtain maximum 16 ADPs; obtaining maximum 512 ADPs in accordance with maximum 256 ADPs corresponding to a positive frequency shift, and maximum 256 ADPs, corresponding to a negative frequency offset; performing Kum�stilnovo savings for other ADPs, obtained after removal of the 256 maximum ADPs, corresponding to a positive frequency shift, of all ADPs, corresponding to a positive frequency shift, to obtain the noise data of a positive frequency shift, and the execution cumulative savings for other ADPs obtained after removal maximum 256 ADPs, corresponding to a negative frequency shift, of all ADPs; the corresponding negative frequency shift, to obtain the noise data negative frequency shifts; and packing maximum 512 ADPs and two sets of data on the noise and the message Packed maximum 512 ADPs and two sets of data on the noise of the corresponding subsystem.

The invention also provides a system of detection of the preamble, which contains: a unit correlative accumulation, the compensation unit and the unit of parallel processing, in this case,

unit is correlative accumulation configured for separation of the chips of the preamble to the multiple blocks of chips and perform correlative accumulation blocks on the chip to obtain multiple groups of the partial products of the components of the signatures.

the compensation unit is configured to: perform a compensation of the positive frequency shift for each group of the multiple groups of the partial products of the components of the signature to obtain multiple groups of the results of the compensation�AI positive frequency shift, and execution of compensating the negative frequency shift for each group of the multiple groups of the partial products of the components of the signature to obtain multiple groups of results to offset the negative frequency shifts; and

the unit of parallel processing is configured to perform coherent accumulation, phase rotation, approval signatures and the computation of an integral module, and the unification of the dual antennas on multiple groups of the results of the compensation of the positive frequency shift, and perform coherent accumulation, phase rotation, approval signatures, and evaluate complex module, and the unification of the dual antennas on multiple groups of results to offset the negative frequency shift.

In the system unit of parallel processing may further comprise:

the first processing unit is configured to perform coherent accumulation, phase rotation, approval signatures, and evaluate complex module, and the unification of the dual antennas on multiple groups of the results of the compensation of the positive frequency shift; and

the second processing unit, configured to perform coherent accumulation, phase rotation, approval signatures, and evaluate complex module, and the unification of the dual antennas on multiple groups of results to�mpensatio negative frequency shift.

The system may further comprise:

block non-coherent accumulation, configured to perform, when the length of coherent accumulation of Ncequal to 2048, non-coherent accumulation for the two groups of multiple partial products of signature, with two groups of multiple partial products of signatures obtained through the completion of the unification of dual-antenna for the same frequency shift; and

block sequencing and accumulation of the noise data is configured to calculate the maximum ADP and the noise data and messages for maximum ADP and the noise data corresponding subsystem.

In the method and system of detection of the preamble provided by the invention, the chips of the preamble are divided into multiple blocks of chips, and correlative accumulation is performed on the set of blocks of chips to obtain multiple groups of the partial products of the components of the signature; compensation of positive frequency shift is performed on each group of the multiple groups of the partial products of the components of the signature to obtain multiple groups of the results of the compensation of the positive frequency offset, and compensation of the negative frequency shift is performed on each group of the multiple groups of the partial products of the components of the signature to obtain multiple groups re�of Ulatov compensation of the negative frequency shift; coherent accumulation, rotation phases, approval signatures and the computation of an integral module, and the unification of the dual antennas are performed for multiple group results compensation of the positive frequency shift, and coherent accumulation, rotation phases, approval signatures and the computation of an integral module, and the unification of the dual antennas are performed on multiple groups of results to offset the negative frequency shift. That is, compensation of positive frequency shift and the subsequent processing and related operations are performed on each group of the multiple groups of the partial products of the components of the signature, and compensation of negative frequency shift and subsequent processing and related operations are performed on each group of the multiple groups of the partial products of the components of the signature, so that the processing speed can be doubled for the effective implementation of the detection of the preamble in the WCDMA system. When you add the processing type of frequency shift required to add only one set of hardware resources to the phases of the coherent accumulation, phase rotation, approval signatures, and evaluate complex module, and the unification of the dual antennas. Compared with the existing method of adding the full set of resources, in the invention the processing speed of udviv�is without doubling the hardware resources. Therefore, the invention can reduce the cost, has good extensibility, and can flexibly configure the number of frequency shifts for parallel processing.

BRIEF DESCRIPTION of GRAPHIC MATERIALS

Fig.1 shows a block diagram schematic of detection of the preamble in the prior art;

Fig.2 shows a block diagram of a method of detection of the preamble according to the invention;

Fig.3 shows a specific process of the method of detection of the preamble according to the invention; and

Fig.4 shows a block diagram of a system for the detection of the preamble according to the invention.

DETAILED DESCRIPTION

The basic idea of the invention is as follows: the chips of the preamble are divided into multiple blocks of chips, and correlative accumulation is performed on the set of blocks of chips to obtain multiple groups of the partial products of the components of the signature; compensation of positive frequency shift is performed on each group of the multiple groups of the partial products of the components of the signature to obtain multiple groups of the results of the compensation of the positive frequency offset, and compensation of the negative frequency shift is performed on each group of the multiple groups of the partial products of the components of the signature to obtain multiple groups of results to offset the negative frequency shift; COH�rental savings rotation phases, approval signatures and the computation of an integral module, and the unification of the dual antennas are performed for multiple group results compensation of the positive frequency shift, and coherent accumulation, rotation phases, approval signatures and the computation of an integral module, and the unification of the dual antennas are performed on multiple groups of results to offset the negative frequency shift.

The invention is further discussed with reference to graphic materials and specific implementation options.

The invention provides a method for the detection of the preamble. Fig.2 shows a block diagram of a method of detection of the preamble according to the invention. As shown in Fig.2, the method includes the following steps:

Step 201: an algorithm for the integrated operation of detection of the preamble is simplified.

Namely, the coefficient of the phase rotation isej(π4+π2(256k+mNc+16i+j))in the existing algorithm integrated the operations of detection of the preamble is simplified asej (π4+π2j). The simplified algorithm of the integral discovery of the preamble is as follows:

Thus, the ratio of rotation of the phases that initially correlated with each chip, now correlated only with the component of the signature of j, thus simplifying the algorithm integrated the operations of detection of the preamble.

Step 202: the Chips of the preamble are divided into multiple blocks of chips, and correlative accumulation is performed on the set of blocks of chips to obtain multiple groups of the partial products of the components of the signature.

Namely, according to the order block 15, block 14, ..., block 0, 4096 chips preamble are divided into 16 256-chip blocks and placed in the cache. Each 256-chip block contains 16 rows and 16 columns of 256 chips. As shown in Fig.3, 16 256-chip blocks, the chips are ordered in each 256-chip block from right to left and from bottom to top in ascending order of the sequence numbers of 4096 chips.

According to the 3GPP Protocol, can be generated 4096 Clong,1,nscramblers codes. Generated scramblers codes are placed in the cache in the same way as 4096 chips preamble.

Cached 4096 chips and placed in the cache 4096 scramblers codes respectively per�meraude, that is, the p-th chip is multiplied by the p-th scramblase code, where p=0, 1, ...4095. As shown in Fig.3, the works of each chip and the corresponding scrambling code in the same line of each 256-chip of the block are summed to obtain the 16 groups of 16 partial products of the components of the signature.

In this version of the implementation, a partial work refers to the accumulated value obtained after each stage in the process of detection of the preamble.

Step 203: Compensation to a positive frequency shift is performed on each group of the multiple groups of the partial products of the components of the signature to obtain multiple groups of the results of the compensation of the positive frequency offset, and compensation of the negative frequency shift is performed on each group of the multiple groups of the partial products of the components of the signature to obtain multiple groups of results to offset the negative frequency shift.

Namely, the compensation of positive frequency offset and compensation of the negative frequency shift is performed respectively for each group 16 of the partial products of the components of the signatures 16 groups of 16 partial products of the components of the signatures obtained after correlative accumulation on the basis of accuracy corresponding to 256 chips. That is, each group of partial� works signature components is multiplied by the compensation value, the frequency offset is ej2πfetkandej2π(fe)tkrespectively. As shown in Fig.3, after compensation of the positive frequency offset and compensation of negative frequency shift, 16 groups are displayed the results of the compensation of the positive frequency shift and 16 groups of results to offset the negative frequency shift, respectively.

Step 204: the Coherent accumulation is performed on multiple groups of the results of the compensation of the positive frequency shift, and the coherent accumulation is performed on multiple groups of results to offset the negative frequency shift.

Specifically, in the actual implementation can be added a set of hardware resources to run properly coherent accumulation of the partial products of the same components of the signatures on the 16th groups of the results of the compensation of the positive frequency shift and 16 groups of results to offset the negative frequency shift. The coherent accumulation length Nccan have different values� when calculating the coherent accumulation. In a variant implementation, as examples taken Nc=4096 and Nc=2048. During the coherent accumulation, if the length of coherent accumulation of Nc4096, coherent accumulation is performed on the 16 partial products of component j of the signatures belonging to the same frequency shift. If the length of coherent accumulation of Ncequal to 2048, coherent accumulation is performed on the first 8 partial products of component j of the signatures belonging to the same frequency shift, and the coherent accumulation is performed on the last 8 partial products of component j of the signatures belonging to the same frequency shift. As shown in Fig.3, after the completion of the coherent accumulation, if the length of coherent accumulation of Ncis 4096, a group of 16 partial products of the components of the signature is displayed for positive frequency shift, and a group of 16 partial products of the components of the signature is displayed for negative frequency shift. If the length of coherent accumulation of Ncequal to 2048, two groups of 16 partial products of the components of the signature are displayed for positive frequency shift, and two groups of 16 partial products of the components of the signature are displayed for negative frequency shift.

Step 205: the Rotation phase is performed respectively on the results obtained after COH�rental savings using the ratio of the phase rotation isej(π4+π2j).

Specifically, as the integral algorithm of the operation of detection of the preamble is simplified in Step 201, the rotation phase is performed respectively on the positive results of the frequency shift and the negative frequency shift is obtained after coherent accumulation, with the use of the simplified ratio phase rotation isej(π4+π2j). That is, partial works signature components corresponding to j rotate on(π4+π2j)degrees according to the value of the sequence number (the second j in the simplified algorithm of the integral discovery of the preamble) 16 signature components in each component group signatures. As shown in Fig.3, after the completion of the rotation phase, if the length of coherent accumulation of Nc�avna 4096, a group of 16 partial products of the components of the signature is displayed for positive frequency shift, and a group of 16 partial products of the components of the signature is displayed for negative frequency shifts; if the length of coherent accumulation of Ncequal to 2048, two groups of 16 partial products of the components of the signature are displayed for positive frequency shift, and two groups of 16 partial products of the components of the signature are displayed for negative frequency shift.

Step 206: Approval signatures and the computation of an integral module executed on the result obtained after phase rotation.

Specifically, the coordination of the signature is performed on the result of the rotation phase of the positive frequency shift and the rotation phase of the negative frequency shift, respectively. That is, the rotation phase of the positive frequency shift and the rotation phase of the negative frequency shift multiplied by the Hadamard matrix, respectively; here, the Hadamard matrix can be in the form:

where rot(15), red(14), ...... rot(0) represent the 16 partial products of the components of the signatures withdrawn after phase rotation; hat(15), hat(14), ......, hat(0) represent the results obtained after approval signatures; andsnj represents the j-th component of the signature of n, where n=0, 1, 15, and j=0, 1, 15; and

As shown in Fig.3, the computation of an integral module should be executed after approval signatures. If the length of coherent accumulation of Ncis 4096, a group of 16 partial products signature is displayed for positive frequency shift, and a group of 16 partial products signature is displayed for negative frequency shift. If the length of coherent accumulation of Ncequal to 2048, two groups of 16 partial products signatures are derived for positive frequency shift, and two groups of 16 partial products signatures are displayed for negative frequency shift.

Step 207: the unification of the dual antenna is performed respectively on the results obtained after approval signatures and evaluate complex module.

Specifically, each chip contains a group of data dual antenna. After approval signatures and evaluate complex module, the unification of dual antennas is performed respectively on the results obtained after approval signatures and evaluate complex module. That is, the average results from the two antennas, subject to approval signatures and the computation of an integral module, is calculated in each partial product of the components of the signatures. As shown in Fig.3, p�, after the close of the unification of dual-antenna, if the length of coherent accumulation of Ncis 4096, a group of 16 partial products signature is displayed for positive frequency shift, and a group of 16 partial products signature is displayed for negative frequency shifts; if the length of coherent accumulation of Ncequal to 2048, two groups of 16 partial products signatures are derived for positive frequency shift and two groups of 16 partial products signatures are displayed for negative frequency shift.

Step 208: If the length of coherent accumulation of Nc4096, after the unification of the dual antennas, a group of 16 partial products of signatures obtained for positive frequency shift, and a group of 16 partial products of signatures obtained for negative frequency shift. There is no need to perform processing non-coherent accumulation, since there is only one group of 16 partial products signatures for positive frequency shift, and there is only one group of 16 partial products signatures for negative frequency shift.

As shown in Fig.3, if the length of coherent accumulation of Ncequal to 2048, non-coherent accumulation is performed on two groups of multiple partial products of signature, with two groups of multiple partial produced�th signature obtained through the completion of the unification of dual-antenna for the same frequency shift. Specifically, for each positive frequency shift and negative shift in frequency, after approval signatures are present two groups of 16 partial products of signature, in this case, non-coherent accumulation is performed on two groups of 16 partial products of signatures obtained after combining double antenna for the same frequency shift, to output a group of 16 ADPs for positive frequency shift and output the group of 16 ADP for negative frequency shift.

Steps 203-208 are required to 4096 chips of all provisions to search the preamble of the same tasks as the detection of the preamble, and the results obtained after the Steps 203-208, are combined in step 209.

Step 209: Calculate the maximum ADP and data about noise and maximum ADP and data noise are communicated to the appropriate subsystem.

Specifically, ADPs, meeting the same signature and the same frequency shift, which are obtained by performing the detection of the preamble at all positions to search the same problem of detection of the preamble is arranged to obtain maximum 16 ADPs. 512 maximum ADPs obtained according to maximum 256 ADPs corresponding to a positive frequency shift, and maximum 256 ADPs, corresponding to a negative frequency shift. Then, the cumulative accumulation of runs on OS�social ADPs, obtained after removal of the 256 maximum ADPs, corresponding to a positive frequency shift, of all ADPs, corresponding to a positive frequency shift, to obtain the noise data of a positive frequency shift, and the cumulative accumulation is performed on the remaining ADPs obtained after removal maximum 256 ADPs, corresponding to a negative frequency shift, of all ADPs, corresponding to a negative frequency shift, to obtain the noise data of a negative frequency shift. Finally, maximum 512 ADPs and two sets of the noise data is packaged and then are communicated to the respective subsystem so that the subsystem can detect the presence of the preamble, it calculates the position of the preamble is calculated and offset.

To perform the above method, the invention also provides a system for detecting the preamble, which is applied to the WCDMA system. Fig.4 shows a block diagram of a system for the detection of the preamble according to the invention. As shown in Fig.4, the system comprises: a block 41 correlative accumulation, the compensation unit 42 and the block 43 parallel processing.

Unit 41 correlative accumulation configured for separation of the chips of the preamble to the multiple blocks of chips and perform correlative accumulation blocks on the chip to obtain multiple groups of partial �of proizvedenii component signatures.

The compensation unit 42 is configured to: perform a compensation of the positive frequency shift for each group of the multiple groups of the partial products of the components of the signature to obtain multiple groups of the results of the compensation of the positive frequency shift, and performing compensation of the negative frequency shift for each group of the multiple groups of the partial products of the components of the signature to obtain multiple groups of results to offset the negative frequency shift.

Block 43 parallel processing is configured to perform coherent accumulation, phase rotation, approval signatures and the computation of an integral module, and the unification of the dual antennas on multiple groups of the results of the compensation of the positive frequency shift, and perform coherent accumulation, phase rotation, approval signatures, and evaluate complex module, and the unification of the dual antennas on multiple groups of results to offset the negative frequency shift.

Block 43 parallel processing further comprises:

the first block 431, the processing configured to perform coherent accumulation, phase rotation, approval signatures, and evaluate complex module, and the unification of the dual antennas on multiple teams results awards for�otelnogo the frequency offset; and

the second processing unit 432 is configured to perform coherent accumulation, phase rotation, approval signatures, and evaluate complex module, and the unification of the dual antennas on multiple groups of results to offset the negative frequency shift.

The system further includes:

block 44 non-coherent accumulation, configured to perform, when the length of coherent accumulation of Ncequal to 2048, non-coherent accumulation for the two groups of multiple partial products of signature, with two groups of multiple partial products of signatures obtained through the completion of the unification of dual-antenna for the same frequency shift; and

block 45 sequencing and accumulation of the noise data is configured to calculate the maximum ADP and the noise data and messages for maximum ADP and the noise data corresponding subsystem.

The stage at which perform compensation of a positive frequency shift for each group of the multiple groups of the partial products of the components of the signature and performs compensation of the negative frequency shift for each group of the multiple groups of the partial products of the components of the signatures includes: multiplying each group of the partial products of the components of the signatures of the 16 groups of the partial products of a component of the�the components of the signature, received after correlative accumulation on compensation values of the frequency shift ofej2πfetkandej2π(fe)tkrespectively.

Phase coherent accumulation, rotation phases, approval signatures and the computation of an integral module, and merge the double perform antenna on multiple bands results compensation of the positive frequency shift, and coherent accumulation, rotation phases, approval signatures and the computation of an integral module, and merge the double perform antenna on multiple bands results of compensating the negative frequency shift, includes:

performing coherent accumulation on the 16th groups of the results of the compensation of the positive frequency offset and performing coherent accumulation on the 16th groups of the results of compensating the negative frequency offset; performing phase rotation respectively on the results obtained after coherent accumulation, using the ratio of the phase rotation is ej(π4+π2j); reconciling signatures and evaluate complex module respectively on the result obtained after phase rotation; and performing a join dual antenna respectively on the results obtained after approval signatures and evaluate complex module.

Above are only preferred embodiments of the invention, and they can't limit the scope of protection defined by the claims. Any modifications, equivalent substitutions, improvements etc. made within the concept and principle of the invention shall fall into the scope of legal protection defined by the claims.

1. Method of detection of the preamble, including:
the separation of the chips of the preamble to the multiple blocks of chips and perform correlative accumulation on the set of blocks of chips to obtain multiple groups of the partial products of the components of the signatures.
performing compensation of the positive frequency shift for each group of the multiple groups of the partial products of the components of the signature to obtain multiple groups of the results of the compensation of the positive frequency shift and the implementation of the comp�ncacii negative frequency shift for each group of the multiple groups of the partial products of the components of the signature to obtain multiple groups of results to offset the negative frequency shift; and
performing coherent accumulation, phase rotation, approval signatures, and evaluate complex module, and combining the dual antenna signals based on the multiple groups of the results of the compensation of the positive frequency shift, and performing coherent accumulation, phase rotation, approval signatures, and evaluate complex module, and combining the dual antenna signals based on the multiple groups of the results of compensating the negative frequency shift.

2. A method according to claim 1, wherein said execution phase compensation of the positive frequency shift for each group of the multiple groups of the partial products of the components of the signature and execution of compensating the negative frequency shift for each group of the multiple groups of the partial products of the components of the signatures includes:
multiplying each group of the partial products of the components of the signatures of the 16 groups of the partial products of the components of the signatures obtained after correlation accumulation values on the compensation of the frequency shift ofej2πfetkandej2π(fe )tkrespectively.

3. A method according to claim 1, characterized in that the step of performing coherent accumulation, phase rotation, approval signatures, and evaluate complex module, and combining the dual antenna signals based on the multiple groups of the results of the compensation of the positive frequency shift and perform coherent accumulation, phase rotation, approval signatures, and evaluate complex module, and combining the dual antenna signals based on the multiple groups of the results of compensating the negative frequency offset includes:
performing coherent accumulation based on 16 groups of results positive compensation of frequency offset and performing coherent accumulation based on 16 groups of results to offset the negative frequency shift;
performing phase rotation respectively on the basis of the results obtained after coherent accumulation, using the ratio of the phase rotation isej(π4+π2j);
reconciling your signature and evaluate complex module respectively on the basis of RES�objectives, obtained after phase rotation; and
the implementation of the unification of the dual antenna signals respectively on the basis of the results obtained after approval signatures and evaluate complex module.

4. A method according to claim 3, characterized in that the step of performing coherent accumulation based on the multiple groups of the results of the compensation of the positive frequency shift and perform coherent accumulation based on the multiple groups of the results of compensating the negative frequency offset includes:
performing coherent accumulation of the partial products of the same components of the signatures on the basis of the 16 groups of the results of the compensation of the positive frequency shift and perform coherent accumulation of the partial products of the same components of the signatures on the basis of the 16 groups of the results of compensating the negative frequency shift; if the length of coherent accumulation of Nc4096, performing coherent accumulation based on the 16 partial products of component j of the signatures belonging to the same frequency offset to output a group of 16 partial products of the components of the signatures for positive frequency shift and output the group of 16 partial products of the components of the signatures for negative frequency shifts; if the length of coherent accumulation of Ncequal to 2048, vypolnyaemogo savings for the first 8 partial products of component j signature owned by the same frequency shift, and performing coherent accumulation based on the last 8 partial products of component j of the signatures belonging to the same frequency offset to output two groups of 16 partial products of the components of the signatures for positive frequency shift and output two groups of 16 partial products of the components of the signatures for negative frequency shift.

5. A method according to claim 3, characterized in that the step of performing phase rotation, respectively, on the results obtained after coherent accumulation, includes:
the rotation of the partial products of the components of the signature corresponding to j, on(π4+π2j)degrees in accordance with the value of the sequence number j 16 components of the signature; if the length of coherent accumulation of Ncis 4096, the output of a group of 16 partial products of the components of the signatures for positive frequency shift and the output of a group of 16 partial products of the components of the signatures for negative frequency shifts; if the length of coherent accumulation of Ncequal to 2048, the output of two groups of 16 partial products of the components of the signatures for positive shift chastoty conclusion two groups of 16 partial products of the components of the signatures for negative frequency shift.

6. A method according to claim 3, characterized in that the step of the approval signatures and evaluate complex module respectively on the results obtained after the phase rotation includes:
the multiplication result of the rotation phase of the positive frequency shift and phase rotation negative frequency shift, respectively, on the Hadamard matrix:

where rot(15), red(14), ..., rot(0) represent the 16 partial products of the components of the signatures withdrawn after phase rotation; hat(15), hat(14), ..., hat(0) represent the results obtained after approval signatures; and
snjrepresents the j-th component of the signature of n, where n=0, 1, ...15; and j=0, 1, ...15; and
the calculation you are performing a comprehensive module on the basis of the results obtained after approval signatures; if the length of coherent accumulation of Ncis 4096, the output of a group of 16 partial products signatures for positive frequency shift and the output of a group of 16 partial products signatures for negative frequency shifts; if the length of coherent accumulation of Ncequal to 2048, the output of two groups of 16 partial products signatures for positive frequency shift and output two groups of 16 partial products signatures for negative shear cha�toty.

7. A method according to claim 3, characterized in that the implementation of the unification of the dual antenna signals respectively on the basis of the results obtained after approval signatures and calculating an integrated module that includes:
after approval signatures and complex calculation module, the calculation of the average results from the two antennas, subject to approval signatures, and calculating an integral module in each partial product of the components of the signature; if the length of coherent accumulation of Ncis 4096, the output of a group of 16 partial products signatures for positive frequency shift and the output of a group of 16 partial products signatures for negative frequency shifts; if the length of coherent accumulation of Ncequal to 2048, the output of two groups of 16 partial products signatures for positive frequency shift and output two groups of 16 partial products signatures for negative frequency shift.

8. A method according to claim 1, further comprising: when the length of coherent accumulation of Ncequal to 2048,
performing non-coherent accumulation on the basis of two groups of multiple partial products of signature, with two groups of multiple partial products of signatures obtained by the completion of the unification of the dual antenna signals for the same DM�yoke of frequency.

9. A method according to claim 8, characterized in that the step of performing non-coherent accumulation on the basis of two groups of multiple partial products of signatures includes:
for each positive frequency shift and negative shift in frequency, after approval signatures are present two groups of 16 partial products signature; performing non-coherent accumulation on the basis of two groups of 16 partial products of signatures obtained after combining the signals of the dual-antenna for the same frequency shift, the output of a group of 16 profiles of the amplitude delay (ADPs) for positive frequency shift and output the group of 16 ADPs for negative frequency shift.

10. A method according to claim 8 or 9, further comprising:
calculation of the maximal ADP and the noise data, and the maximum message ADP and the noise data corresponding subsystem.

11. A method according to claim 10, characterized in that the calculation of the maximal ADP and the noise data and maximum message ADP and the noise data corresponding subsystem includes:
the ordering of the ADPs, corresponding to the same signature and the same frequency shift, which is obtained by performing the detection of the preamble at all positions to search the same problem of detection of the preamble, to obtain maximum 16 ADPs; obtaining maximum 512�'s ADPs in accordance with maximum 256 ADPs, the corresponding positive frequency shift, and maximum 256 ADPs, corresponding to a negative frequency offset; performing a cumulative savings for other ADPs obtained after removal maximum 256 ADPs, corresponding to a positive frequency shift, of all ADPs, corresponding to a positive frequency shift, to obtain the noise data of a positive frequency shift, and the execution cumulative savings for other ADPs obtained after removal maximum 256 ADPs, corresponding to a negative frequency shift, of all ADPs, corresponding to a negative frequency shift, to obtain the noise data of the negative frequency shift; and packing maximum 512 ADPs and two sets of data on the noise and the message Packed maximum 512 ADPs and two sets of data on the noise of the corresponding subsystem.

12. Detection of the preamble, comprising: a unit correlative accumulation, the compensation unit and the unit of parallel processing, characterized in that
unit is correlative accumulation configured for separation of the chips of the preamble to the multiple blocks of chips and perform correlative accumulation blocks on the chip to obtain multiple groups of the partial products of the components of the signatures.
the compensation unit is configured to: perform a compensation of the positive shift �of astuti on each group of the multiple groups of the partial products of the components of the signature to obtain multiple groups of the results of the compensation of the positive frequency shift, and execution of compensating the negative frequency shift for each group of the multiple groups of the partial products of the components of the signature to obtain multiple groups of results to offset the negative frequency shifts; and
the unit of parallel processing is configured to perform coherent accumulation, phase rotation, approval signatures, and evaluate complex module, and combining the dual antenna signals based on the multiple groups of the results of the compensation of the positive frequency shift, and perform coherent accumulation, phase rotation, approval signatures, and evaluate complex module, and combining the dual antenna signals based on the multiple groups of the results of compensating the negative frequency shift.

13. A system according to claim 12, characterized in that the unit of parallel processing further comprises:
the first processing unit is configured to perform coherent accumulation, phase rotation, approval signatures, and evaluate complex module, and combining the dual antenna signals based on the multiple groups of the results of the compensation of the positive frequency shift; and
the second processing unit, configured to perform coherent accumulation, phase rotation, approval signatures, and evaluate complex module, obyedinenie signals dual antennas on the basis of multiple groups of results to offset the negative frequency shift.

14. A system according to claim 12 or 13, further comprising:
block non-coherent accumulation, configured to perform, when the length of coherent accumulation of Nwithequal to 2048, non-coherent accumulation on the basis of two groups of multiple partial products of signature, with two groups of multiple partial products of signatures obtained through the completion of the merger signals dual antennas for the same frequency shift; and
block sequencing and accumulation of the noise data is configured to calculate the maximum ADP and the noise data and messages for maximum ADP and the noise data corresponding subsystem.



 

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19 cl, 2 dwg

FIELD: radio engineering, communication.

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12 cl, 10 dwg

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2 cl, 21 dwg

FIELD: radio engineering, communication.

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6 cl, 6 dwg

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7 cl, 19 dwg

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9 cl, 6 dwg

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15 cl, 11 dwg

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41 cl, 6 dwg

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26 cl, 6 dwg

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31 cl, 8 dwg

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61 cl, 7 dwg, 3 tbl

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18 cl, 5 dwg

FIELD: information technologies.

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32 cl, 13 dwg

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43 cl, 5 dwg

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95 cl, 10 dwg

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