CN1666483B - Apparatus and method for determining the deviation between the carrier frequency of a mobile wireless device and the carrier frequency of a base station - Google Patents
Apparatus and method for determining the deviation between the carrier frequency of a mobile wireless device and the carrier frequency of a base station Download PDFInfo
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- CN1666483B CN1666483B CN03815785.3A CN03815785A CN1666483B CN 1666483 B CN1666483 B CN 1666483B CN 03815785 A CN03815785 A CN 03815785A CN 1666483 B CN1666483 B CN 1666483B
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
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- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2662—Arrangements for Wireless System Synchronisation
- H04B7/2668—Arrangements for Wireless Code-Division Multiple Access [CDMA] System Synchronisation
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
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- H04L2027/003—Correction of carrier offset at baseband only
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Abstract
本发明提供一种用于决定移动无线装置与基站之间的频率差异(105)的装置，其中该基站乃传送一符号序列。该装置具有一用于计算项目之单元(6-11)，其中每一项目由该移动无线装置所接收的该序列中的至少两不同导频符号所形成，且其中该两导频符号间的相位差异亦可由该项目而决定；一用于自所述项目形成群组之单元(14，15)，其中每一项目基于其所根据之导频符号的特征而被归类至某一群组中；以及一用于根据一群组而计算差异(105)之单元(39)。
The invention provides an apparatus for determining a frequency difference (105) between a mobile wireless device and a base station, wherein the base station transmits a sequence of symbols. The device has a unit (6-11) for calculating entries, wherein each entry is formed from at least two different pilot symbols in the sequence received by the mobile wireless device, and wherein the distance between the two pilot symbols The phase difference may also be determined from the item; a unit (14, 15) for forming groups from said items, wherein each item is classified into a certain group based on the characteristics of the pilot symbols it is based on ; and a unit (39) for computing differences (105) from a group.
Description
Technical field
The present invention system is about a kind of device that determines the difference of a portable radio carrier frequency and base station carrier, and the present invention is also about the method for its correspondence.
Background technology
In order to transmit symbol between base station and portable radio, described symbol system one of is modulated in the conveyer carrier frequency and demodulation in receiver; Therefore, portable radio must use identical carrier frequency with the base station.Yet when the portable radio carrier frequency is variant when existing, this difference must be determined, can be compensated then to make it.For example, the reason that causes in the portable radio producing this frequency difference be to produce the tolerance limit of oscillator of carrier frequency so, another reason that produces frequency shifting then is the disturbance of temperature; In addition, relatively moving between portable radio and the platform also causes Doppler (Doppler) frequency shifting.
Usually, for the two continuous intersymbol phase differences that determine the carrier frequency difference between the portable radio, can measure to receive by portable radio, wherein must be first the known data sequence of demodulation one, it is to be modulated to described symbol; Because received symbol is a complex symbol, it can be illustrated on the complex number plane by pointer.When two symbols that result from base station when being identical, can be regarded as phase difference between two receiving symbols in the anglec of rotation of associated pointers on the complex number plane; This phase difference is represented the direct measuring method of the frequency difference between base station carrier and portable radio carrier frequency.
In universal mobile telecommunications system (UMTS) standard, can be by pilot signal (common pilot channel, CPICH) auxiliary and the frequency error of decision portable radio; Pilot signal is the signal that transmit the base station, and the continuous circulation sample of identical frequency pilot sign or two different frequency pilot signs then transmits by this and continuously; Therefore pilot signal is particularly suitable for above-mentioned phase difference measurement.
Be expressed as following text r by the frequency pilot sign system that portable radio received with integral parameter k
k, wherein integral parameter k is expression frequency pilot sign r
kTime series; Utilize following formula (1) can be directly from the two frequency pilot sign r that receive continuously
K-1With r
kBetween measured phase difference Δ ψ come calculated rate discrepancy delta f:
Time T wherein
SExpression frequency pilot sign r
K-1With r
kBetween transmit in interbody spacer, the frequency pilot sign rate is by 1/T
SAnd calculate, and in the UTMS standard, it is 15kHz.
By frequency pilot sign r
kWith complex conjugate frequency pilot sign r
K-1 *Can form a multiplication of complex numbers U
k:
Multiplication of complex numbers U
kArgument (argument) then represent phase difference Δ ψ:
Above-mentioned formula (1) to formula (3) provides a computation rule, can estimate the frequency difference Δ f of portable radio by this, and its absolute value scope is as the formula (4):
For little phase difference Δ ψ, in order to have the assorted E that compares of news
S/ N
0Additivity white Gauss noise (AWGN), its phase difference Δ ψ changes var (Δ ψ) and can be calculated by following formula in the distribution of L value:
(5)
Up to the present, the two frequency pilot sign r that on the frequency pilot sign time series, directly follow have each other been considered
kWith r
K-1Yet,, the two frequency pilot sign r that on the frequency pilot sign time series, separated with D symbol each other
kWith r
K-DAnalysis then have peculiar advantage; In order to make these advantages, in formula (2), formula (4) and formula (5), must consider parameter D like being reasonable:
(8)
Can learn the advantage of introducing parameter D from formula (8): the increase of this parameter D causes changing the minimizing of var (Δ ψ), yet in formula (7), the increase of parameter D has caused the absolute value scope equally | the minimizing of Δ f|.
When base station operation in space-time emission diversity (STTD) pattern, wireless signal system transmits from two antenna for base station, therefore, must calculate the multiplication of complex numbers U of two antennas respectively
k
In the example of known portable radio, the difference between portable radio carrier frequency and the base station carrier can be calculated in firmware fully by a digital signal processor; Therefore, if the number of the base station of each base station is investigated with the number of transfer path, then all data are to be sent to this digital signal processor based on a single-pathway; This data/address bus that this digital signal processor and transmission data are used has all caused high work load.
The object of the present invention is to provide the device of a decision portable radio carrier frequency and base station carrier deviation, in this device, need extra effort to carry out needed calculating operation hardly; Another purpose then is clearly to indicate the method for a correspondence.
Summary of the invention
Arrangement according to the invention can determine the deviation between the base station carrier of portable radio carrier frequency and at least one use UTMS system; For this conception, as known portable radio, each base station system is sent to portable radio by radio with the sequence of a plural frequency pilot sign.Arrangement according to the invention has Unit one first, 1 second and the 3rd.This first module system is used to carry out project to be calculated, and each project is then formed by the frequency pilot sign of two differences in the sequence that this portable radio received at least; In addition, also project decision from then on of the phase difference between this two frequency pilot sign.This second unary system is used for forming group from described project, and wherein each project system is based on the characteristic and speciality of the frequency pilot sign of its institute's basis and in the classified extremely a certain group.The 3rd unary system is used for according in the project of at least one group and calculated rate difference.
The characteristic and speciality of frequency pilot sign is that described frequency pilot sign is sorted out to the basis of relevant group, for example, it is relevant with the certain base station that transmits this frequency pilot sign, or with transmit this frequency pilot sign the path of process relevant, or it is relevant with the transfer mode (STTD, normal mode) of frequency pilot sign.Arrangement according to the invention can obtain the information about described characteristic and speciality from receiver (for example RAKE receiver), and wherein frequency pilot sign lies in this receiver and gets by demodulated pilot signal.
One of advantage of the present invention is to utilize projects combo and forms group, because the stroke of group, thereby the Unit the 3rd that is used to carry out the final calculating operation of frequency difference decision do not need to have indivedual results' all items, and intermediate object program that need only be relevant with described group; This has reduced the data/address bus institute data quantity transmitted that is configured between this Unit the second and the 3rd, and the calculating operation of minority need only be carried out in Unit the 3rd.Another advantage that forms group is system of described group according to the criterion that is worth further calculating and form, and its to expend mental and physical efforts less.For example, with select quite to have superiority in relevant projects combo to a group from the peak signal transfer path of each base station, this helps to reduce Doppler effect; The combination of paths that the result formed has also increased result's quality in the utilization variance.
This first module and this Unit second are preferably the form of hard online circuit (hard-wiredcircuits), the advantage of this mode is, because the performed job step system in this first module and this Unit second strengthens for calculating expressly, but and uncomplicated, thereby can carry out by hardware easily.
Another advantage of the present invention is Unit the 3rd of being formed by a digital signal processor, and it makes the present invention's device have high flexibility; In addition, by the performed calculating operation negligible amounts about frequency difference calculating of this digital signal processor, thereby this digital signal processor has the computing capability of other work of enough maintenances; For example, this digital signal processor also can be predefined in this Unit second criterion of project being sorted out to group, and this digital signal processor is can carry out further Control work.
The better embodiment one of according to the present invention, this first module system design is with the calculated complex product, wherein each multiplication of complex numbers system is formed by at least two different frequency pilot signs in the time sequence that portable radio received, and the argument of this multiplication of complex numbers is then represented the phase difference between this two frequency pilot sign.One alternative way of the calculating of this form is can calculate the phase angle of this at least two frequency pilot sign at first respectively, and then calculate phase difference by described phase angle.
This first module is preferably and comprises a multiplier, and it has one first input and one second input; Cording has a circuit branch before this first input, this circuit branch then contains a Delay Element and a converting unit, so that a complex values is converted to a multiple conjugate value, and this circuit branch system be provided with described frequency pilot sign one of them, this second input then is provided with another frequency pilot sign.
Be preferably the time of delay of this Delay Element and can change with predetermined.
For example, this Delay Element system can make carbon copies internal memory by one and be formed, and before a frequency pilot sign is sent out, it will be temporary in this and can make carbon copies in the internal memory, and the temporary time is corresponding to the time of delay that is assigned to this frequency pilot sign.
In addition, in a preferred mode, also can provide a usefulness that is disposed at the accumulator between this first module and this Unit second, a variable of the project that upwards adds up.
Preferably, described project in a group or the described project of being accumulated lie in this Unit second and upwards add up.
Preferably, also can use one can make carbon copies the integrated results that internal memory temporarily stores group, thereby when new projects are added this group, can this group of fast access.
Particularly, the present invention's preferred embodiment has first module and Unit second, and accumulator, and it respectively can repeat.When this portable radio when a base station that operates in the STTD operator scheme receives frequency pilot sign, this mode seems that advantageous particularly, each antenna for base station will provide the processing path of a special use of described frequency pilot sign.
When this base station behaviour yesterday during in the STTD operator scheme, its advantage that has also is to have Unit one the 4th before this two first module, and it is separated the frequency pilot sign of institute's reception according to associated antenna.
Before this first module, if or be fit to, had one and can make carbon copies internal memory before Unit the 4th, in arrangement according to the invention, this can be made carbon copies internal memory system and be used for to the RAKE receiver in this portable radio from carrying out de in downstream units.
Another preferred embodiment of the present invention is to have in Unit the 3rd from the project or the ability of the group of project formation mean value.
According to the present invention, this device preferably has a control unit, and especially, this control unit can be carried out control and form the relevant work of group; Particularly, described Control work has comprised control item purpose accumulation in predetermined group.This control unit also can be carried out other work, for example preestablishes the time of delay of described Delay Element; If needs are arranged, this digital signal processor can be carried out the work of this control unit.
A main conception of the present invention is to form with being characterized as the basis of frequency pilot sign about described group, and advantageously, these features systems are relevant with its associated base station, and are also relevant with relevant transfer path; For example, will be combined to form a group from all items that frequency pilot sign obtained from same base; Equally also can make up project by specific transfer path obtained in the group.Therefore, for example, this device can be combined in the project relevant with the peak signal transfer path one group from a base station, and this will help to reduce the influence of the Doppler frequency shifting that when mobile this group is brought because of portable radio.One of mode that it is alternative is that the transfer path of different base station can be segmented between different groups, thereby can calculate the Doppler frequency shifting of a certain base station; When described group formed, described project then always was assigned to two or a plurality of group; In addition, described group can be defined as extending to the cell element more than.
Process according to the invention system is in order to decision portable radio carrier frequency and at least one base station carrier difference, and one of known plural sequence of pilot symbols system is sent to portable radio by radio transmission mode from each base station in this portable radio.In order to determine carrier frequency difference, in one first method step, to carry out project and calculate, described project is that at least two different frequency pilot signs in the sequence that this portable radio received form respectively; Phase difference system between this two frequency pilot sign is determined by a project.In one second method step, be to form group from described project, wherein each project system is based on the characteristic and speciality of the frequency pilot sign of its institute's basis and in the classified extremely a certain group.In third party's method step, be according to the described project at least one group and calculated rate difference.
According to the present invention, for the combination of the described project that forms group can Billy determine frequency difference with traditional approach more efficiently; For example, can and reduce by suitable group's selection by the frequency shifting that Doppler effect caused.
Each project in a group forms from this two frequency pilot sign respectively, and this two frequency pilot sign is preferably separated with a predetermined number on sequence of pilot symbols each other.
According to the preferred embodiment of one of the inventive method, the calculating of group system is performed twice, wherein the numeral separated each other of the frequency pilot sign of the project institute basis in this two group and inequality; For example, this numeral system is to represent to the parameter D in the formula (8) suc as formula (6).For example, a group at first selects to form greater than 1 parameter D with one, make this phase difference variation with thereby the frequence estimation error that produces can be relative less; In addition, same calculating system equals 1 parameter D with one and carries out, and whether does not have less absolute value scope when the parameter D greatly to check this calculatings | Δ f|.
Description of drawings
The present invention will be with following literal and is cooperated follow graphic and describe in detail, wherein:
Fig. 1 represents to be integrated in the circuit diagram of the circuit in one of the present invention preferred embodiment;
Fig. 2 represents to be integrated in the circuit diagram of another circuit in one of the present invention preferred embodiment; And
Fig. 3 represents the circuit diagram on the preferable enforcement road of arrangement according to the invention.
Embodiment
Fig. 1 represents the circuit diagram of a circuit 1; This circuit 1 is an assembly one of in apparatus of the present invention (as shown in Figure 3); Because the method for operation of preferred embodiment shown in Figure 3 system is produced by the method for operation of the circuit 1 of Fig. 1, therefore this circuit 1 is described at first.
This circuit 1 is to be integrated in the portable radio, and the pilot signal that this portable radio received lies in the RAKE receiver carries out demodulation, and is converted into frequency pilot sign 100; Described frequency pilot sign 100 with a data rate (for example: 15ks/s) be sent to this circuit 1 is, this example system is to operate in the STTD operator scheme based on the original base station of transmitting described frequency pilot sign 100 of hypothesis, and its signal is transmitted in this base station by the auxiliary of two antennas 1 and 2.This frequency pilot sign 100 lies in this circuit 1 and is divided into two data paths, and wherein related with antenna 1 frequency pilot sign 101 lies in the data path to be handled, and the frequency pilot sign 102 related with antenna 2 lies in another data path and handle.
The described data path that loads this frequency pilot sign 101 and 102 lies among Fig. 1 to be described; It is relevant with the antenna 2 of base station wherein to go up data path system.An one numerical symbol unit 3 and an accumulator 4 are to be connected in series in this data path; This numerical symbol unit 3 has a control input, and it is the output that is connected to a STTD coding unit 2; This STTD coding unit 2 is controlled by a control signal 200.The output system of this accumulator 4 is connected to the input of an input of one of multiplier 10 and a Delay Element 6, and this Delay Element 6 is controlled by a control signal 201; Be a conjugation unit 8 after this Delay Element 6, the output system of this conjugate unit 8 is connected to another input of this multiplier 10.One accumulator 12 and a grouped element 14 are configured in series, and this accumulator 12 is controlled by a control signal 202, and this grouped element 14 is then controlled by a control signal 203.In addition, another data 103 are to be carried to this grouped element 14, and these data 103 are the intermediate object program that the project in the group is integrated; This partly will describe in following further combined with Fig. 3.The output system of this grouped element 14 is carried to the input of one of adder 16.
With the construction mode of the related data path of antenna 1 is identical with the construction mode of the related data path of antenna 2.
For above-mentioned conception, this data path has an accumulator 5, a Delay Element 7, a conjugation unit 9, a multiplier 11, an accumulator 13 and a grouped element 15, and the output system of this grouped element 15 is connected to another input of this adder 16; Compared to the data path that frequency pilot sign 102 is carried, the data path that is carried by frequency pilot sign 101 does not have a numerical symbol unit or a STTD coding unit.
Identical with this Delay Element 6, this Delay Element 7 is controlled by this control signal 201; In addition, this control signal 202 has been controlled this accumulator 13, and this control signal 203 has been controlled this grouped element.As data 103, these data are the intermediate object program that the project in the group is integrated, and in addition, it is to enter this grouped element 15.
An averaging unit 17, a computing unit 18 and a multiplier 19 after this adder 16, have been disposed, this averaging unit 17 is controlled by a control signal 204, except the output numerical value of this computing unit 18, one numerical value 205 is to be admitted to this multiplier 19, this multiplier 19 thereby produce an output valve 105.
As shown in Figure 2, it will be described in detail in following explanation.The complex data that transmitted in data path as shown in Figure 1 system represents with the arrow of additional vertical thick stick one of above before having arrow; The arrow of additional vertical thick stick then is not shown in pure real data or the signal that is transmitted in data path or the signal path; The dotted line arrow is the control signal among presentation graphs 1 and Fig. 2.
In the operation of STTD pattern, antenna for base station 1 has transmitted frequency pilot sign A=1+j ten times in each time slot, and wherein j represents the imaginary number unit; In each time slot, antenna for base station 2 has also transmitted ten frequency pilot signs equally; And except frequency pilot sign A, frequency pilot sign-A=-1-j also can be transmitted equally.The described frequency pilot sign that is transmitted by antenna 2 in each frame can segment to the unit that respectively contains four frequency pilot signs, wherein each unit have by these four sample A that frequency pilot sign formed ,-A ,-A, A, this sample is irregular at the frame boundaries place only.
Once this portable radio receives pilot signal, just distinguish the two continuous pilot symbols of convolution (convolve) from each antenna; Lie in this accumulator 5 from the convolution of the frequency pilot sign of antenna 1 and to carry out, wherein two continuous pilot symbols system is upwards added up, and its summation system then is sent to this Delay Element 7 and this multiplier 11; This program be that one of to send the convolution value relevant with this accumulator 5, so the data rate in these accumulator 5 downstreams just can be reduced to 7.5ks/s from 15ks/s in each processings sequential that substitutes circulates.
In the convolution process of the frequency pilot sign that this antenna 2 is transmitted, two continuous frequency pilot signs equally upwards add up, yet, what must therefore note is, some in the described frequency pilot sign has the negative sign on the numerical value, for fear of producing incorrect result when the convolution, for example 0 or-2A, must before carrying out convolution, just change the numerical symbol of each frequency pilot sign-A; This acts may is carried out by this numerical symbol unit 3.The relevant information system that changes which frequency pilot sign as for needs is sent to this numerical symbol unit 3 by this STTD coding unit 2, is to be stored in this STTD coding unit from the sample of the frequency pilot sign that antenna for base station 2 is transmitted.In addition, this STTD coding unit 2 need be about the initial information of frame, to control this numerical symbol unit 3; This information system is provided to this STTD coding unit 2 by control signal 200, in case the negative sign on the numerical value removes from the frequency pilot sign that antenna 2 is transmitted, two continuous frequency pilot signs just are added in this accumulator 4, equally also are added in the accumulator 5.This convolution process generation value 2A, the data rate in these same accumulator 5 downstreams also is reduced to 7.5ks/s.
The convolution value that is produced from accumulator out of the ordinary 4 or 5 according to one of formula (6) multiplication of complex numbers system and by Delay Element out of the ordinary 6 or 7, conjugate unit 8 or 9 out of the ordinary, and multiplier 10 out of the ordinary or 11 auxiliary and forming; The value r in formula (6) wherein
K-DWith r
kSystem is replaced by the convolution value.For this conception, be positioned at one of this Delay Element 6 or 7 convolution value system and do not sent once more, up to accumulator out of the ordinary 4 or 5 D convolution values that produce subsequently; The size of parameter D system is sent to this Delay Element 6 or 7 by control signal 201, be respectively by conjugate unit 8 or 9 and be converted into the complex conjugate form by the convolution value that Delay Element out of the ordinary 6 or 7 sent; Therefore, the numerical symbol of the imaginary part of this convolution value system is converted.In ensuing multiplier 10 out of the ordinary or 11 more than task processes, manage the convolution value system that is sent by accumulator 4 out of the ordinary or 5 in the sequential circulation throughout and be multiplied by one by conjugate unit out of the ordinary 8 or 9 delays of transmission simultaneously and the convolution value of conjugation; The multiplication of complex numbers of one predetermined quantity system is then upwards added up in accumulator out of the ordinary 12 or 13, is scheduled to by control signal 202 by the quantity system of this accumulator 12 or 13 these continuous multiplications of complex numbers that upwards add up.
In this example, totalling process system respectively extends four multiplications of complex numbers.
The multiplication of complex numbers summation system that is produced by accumulator out of the ordinary 12 or 13 is added to grouped element out of the ordinary 14 or 15; In addition, grouped element 14 or 15 out of the ordinary receives data out of the ordinary 103 and 104 respectively, and it is the intermediate object program that upwards is accumulated as the integration in the group, and its data that have system is provided by accumulator 12 or 13 respectively.
P in the convolution value system that is sent by accumulator out of the ordinary 4 or 5 and the following formula
i jRelevant, in this example, pointer j (j=1,2) expression transmits the associated antenna of frequency pilot sign, and integer pointer i represents the time series of described convolution value; Behind process grouped element 14 or 15 out of the ordinary, can descend train value:
In this example, four products that accumulator 12 or 13 out of the ordinary has added up and sent by multiplier out of the ordinary 10 or 11
This accumulation system is controlled by control signal 202.Grouped element 14 or 15 out of the ordinary is added to data item 103 and 104 according to control signal 203 respectively with accumulator out of the ordinary 12 or 13 summations that sent; It is the totalling pointer m that is expressed as in the project (9).Add up the overall result that adds that pointer m has represented accumulator 12 out of the ordinary or 13, it should be by common combination to form a particular demographic result, and it will narration in detail in following explanation.For example, this pointer m can be in order to representing all propagation paths in the cell element, can upwards be added up in wherein from the result system of accumulator 12 or 13.
In this example, M has represented the quantity of all propagation paths in this cell element.
All treatment steps lie in this circuit 1 and carry out by a hardware circuit before the calculating of project implementation (9), the output of having only described grouped element 14 and 15 is to be carried in the firmware, wherein, the calculating that can carry out other by a digital signal processor 39 is with the decision frequency difference.Be disposed at described unit in this digital signal processor 39 shown in Figure 1 and circuit unit system and one of be regarded as in this digital signal processor 39, handling the computation rule of algorithm.
The project system that is sent by described grouped element 14 and 15 adds up by this digital signal processor 39, and then forms a mean value with specific cycle average time; This two steps system represents with averaging unit 17 with the adder among Fig. 1 16; Average time periodic system is conducted to this averaging unit 17 by control signal 204.This average treatment is reduced to 7.5/ cycle average time ks/s with the data rate in these averaging unit 17 downstreams.
Utilize the formula (3) can be from mean value calculation phase difference Δ ψ, it be by with multiplication of complex numbers U
kMean value plug-in type (3) the right side and get.Computing unit 18 in this circuit 1 promptly supplies the usefulness of this calculation procedure.
According to formula (1), phase difference Δ ψ must be multiplied by the factor 1/ (2 π T
S), and in this example, do for this youngest, the convolution that must remember each two frequency pilot sign in described accumulator 4 and 5 is express time T
SMust be doubled; In addition, also must consider this parameter D; These are considered and have produced a factor 1/ (4 π T
SD), this factor 1/T wherein
SThe frequency pilot sign speed of the frequency pilot sign that transmit the expression base station; For the UMTS standard, this frequency pilot sign speed is 15kHz.In Fig. 1, be multiplied by the factor 1/ (4 π T
SD) step lies in the multiplier 19 and carries out, and this factor 1/ (4 π T
SD) be to be conducted in this multiplier 19 by value 205.This multiplication process has produced frequency difference Δ f and has been output valve 105.
Fig. 2 has represented the circuit diagram of a circuit 20; As this circuit 1, this circuit 20 is can be integrated in the device of preferred embodiment of the present invention as shown in Figure 3.
Compared to circuit shown in Figure 11, this circuit 20 is design to handle the frequency pilot sign that the base station was received that operates in normal manipulation mode by.In normal manipulation mode, signal is only transmitted by an antenna in the base station.
This circuit 20 is based on circuit 1, leaves out and promptly forms this circuit 20 being used for handling on the frequency pilot sign 102 related with antenna 2 data path in the circuit 1.Compared to this circuit 1, this circuit 20 does not have the accumulator 5 that produces circuit 20 as shown in Figure 1 in order to bridge joint, does not also have adder 16, and its function must be deleted in the algorithm of this digital signal processor 39.
Fig. 2 has described the circuit 20 that produces therefrom, and in Fig. 2, the circuit unit identical or consistent with Fig. 1, signal or computation rule have identical assembly reference symbol.Must be noted that the addition process system in the accumulator 13 of this circuit 20 is executed in eight multiplication of complex numbers U
kAnalogized by project (9), it will produce a project (10) that is sent by grouped element 15:
In project (10), integer pointer k system is scheduled to by control signal 202, and it represents this frequency pilot sign r
kThe time sequence.
In addition, in the situation of circuit 20, should be noted that phase difference Δ ψ system is multiplied by a value 1/ (2 π T by this value 205
SD).
Except the average treatment in averaging unit 17, the data rate in this circuit 20 is 15ks/s; Data rate in these averaging unit 17 downstreams then is 15/ cycle average time ks/s.
Fig. 3 has represented the preferred embodiment of one of arrangement according to the invention, and it is in order to one of the carrier frequency difference that determines portable radio circuit 30; Can be integrated in this circuit 30 as Fig. 1 and this circuit 1 and 20 shown in Figure 2.
As circuit 1 and 20, this circuit 30 is provided with the frequency pilot sign 100 by the RAKE receiver institute demodulation in this portable radio equally; At first, described frequency pilot sign 100 is to be sent to a buffer storage 31, and it is in order to this RAKE structure de in the downstream components of this circuit 30.
The described frequency pilot sign 100 de unit 32 of then transmitting scriptures, when this base station operation in the STTD operator scheme, the work of this de unit 32 is according to indivedual antennas frequency pilot sign 100 to be separated.The circuit 1 that Fig. 1 described is about the STTD operator scheme; This de unit 32 also is shown in Fig. 1 equally, and has comprised STTD coding unit 2, numerical symbol unit 3, and accumulator 4 and 5.The de of antenna lies in the de unit 32 and carries out, and as previously mentioned, it is to carry out by the convolution of two continuous pilot symbols.For this conception, first frequency pilot sign system of at first arriving at is temporary in one of these 32 downstreams, de unit buffer storage 33, and when second frequency pilot sign arrives at this de unit 32, the former frequency pilot sign system that has been temporary in this buffer storage is loaded in this de unit 32 once more, make the convolution of this two frequency pilot sign to carry out in this place, the convolution value that is obtained then then is stored in this buffer storage 33.
When the base station system that transmits described frequency pilot sign 100 operates in the normal manipulation mode, this buffer storage 33 of described frequency pilot sign 100 can being write direct; It is the designed base station operation pattern of circuit 20 of Fig. 2.
Temporarily be stored in the convolution value of this buffer storage 33 and frequency pilot sign system be read to a hard online computing unit 34 to carry out further processing, the partial circuit assembly of this computing unit 34 described in Fig. 1 and Fig. 2 is to be suitable for two kinds of base station operation patterns.This computing unit 34 has comprised conjugate unit 8 and 9, multiplier 10 and 11, accumulator 12 and 13, and grouped element 14 and 15.This computing unit 34 is can be based on the some that is used for the assorted circuit than (SINR) calculatings of news, with the complexity of minimizing circuit.
In this example, should be noted that the Delay Element 6 and 7 in this circuit 30 is to be formed by buffer storage 33, the convolution value that is conducted to multiplier 10 or 11 respectively and the frequency pilot sign system that do not contain any delay directly are sent to this computing unit 34 from this de unit 32; And desire just to be sent to this computation module 34 up to after a while by Delay Element 6 or 7 and the convolution value of delay and frequency pilot sign system temporarily are stored in this buffer storage 33.
Above-mentioned method is particularly suitable for referring to from time-division multitask RAKE rake the situation of the frequency pilot sign 100 that (finger) provides continuously, wherein, refer to force a group is associated with described frequency pilot sign 100 according to this RAKE rake in particular cell with the relation in particular propagation path; It is suc as formula shown in the pointer m in (9) and the formula (10).In addition, described frequency pilot sign 100 is that the transfer sequence according to a definition transmits, and wherein this transfer sequence system utilizes the frame sample in a time-slot samples or the time sequence and defines; And described frequency pilot sign 100 is to refer to utilize the time-division multi-tasking method and demodulation by this RAKE rake.Therefore, after lying in each 256 chip, the frequency pilot sign 100 of demodulation refers to that by time-division multitask RAKE rake institute provides.
The purpose of data 103 and/or 104 being passed back computing unit 34 is in order to make up the plural project that this accumulator 12 and 13 is sent with an elastic type, to form group; The described plural project system of desiring to incorporate into a particular demographic is related with a particular path, and for example, it is described signal is sent to portable radio by a certain base station a particular path; Described plural project also can be related with one of upwards the add up transfer path quantity of certain base station in the group.Another minute group selection is characterised in that, is integrated in the group from the described plural project system of the strongest signal paths of one or more base station, and last, which group the user then determines to be formed.
In order to calculate a result of group, intermediate object program system is conducted to grouped element out of the ordinary 14 or 15 in the mode of data 103 or 104, and wherein said intermediate object program has comprised the plural project that present this group is added up; In case when another plural project that accumulator 12 or 13 out of the ordinary is produced is added into previous summation in grouped element out of the ordinary 14 or 15, new intermediate object program will be stored in the buffer storage 35 once more.When accumulator out of the ordinary 12 or 13 has calculated when being associated with the new plural project of one of this group, this intermediate object program will be loaded in grouped element out of the ordinary 14 or 15 once more.In order to form the plural project of group
With
Combination lie in project (9) and (10) and considered by pointer m.
After the integration of having finished each group, the result of each group will be conducted to digital signal processor 39, and it is in order to carry out other calculating, with decision frequency difference Δ f.Fig. 1 and Fig. 2 have illustrated that this digital signal processor 39 is via the performed calculation procedure of adder 16, averaging unit 17, computing unit 18 and multiplier 19; It also can be in the present invention's preferred embodiment, carries out the individual treated step related with this digital signal processor 39 with hardware resiliency ground.
Generally speaking, frequency difference Δ f system is calculated by at least two different parameter D, and for example, available parameter D value is 1 and 4.
Except the work relevant with calculated rate discrepancy delta f, this digital signal processor 39 is also carried out the Control work that forms about group; For example, which group these digital signal processor 39 decisions will form, and suitable pre-adjustment to a control unit 37 is provided.This control unit 37 has been controlled an address-generation unit 38, and these address-generation unit 38 pre-adjustments store the address in the buffer storage 35 of indivedual groups intermediate object program that this computing unit 34 produced.As a result, this address-generation unit 38 also can (at the specific pre-adjustment of one of this digital signal processor 39) be selected intermediate object program, to load this grouped element 14 or 15 by the form of data 103 or 104.
In addition, this circuit 30 has a control unit 36, and this control unit 36 receives control signal 206 from this RAKE receiver; Described control signal 206 has comprised about referring to information with arriving in the related RAKE of the frequency pilot sign of circuit 30 rake; This represents that this control unit 36 is the information such as transfer path that receive by the conjugation data of described control signal 206 and this control unit 37 about associated base station, base station operation pattern and frequency pilot sign 100.
When posting a letter by the mode of control signal 206 with the related information that a specific RAKE rake refers to about the frequency pilot sign of a reception, conjugation data in this control unit 37 just can with decide which transfer path system by the relevant RAKE rake in which cell element refer to receive, its transfer mode also can be discerned according to the base station that is determined.As further information, this RAKE rake refers to be to be associated with one of accumulation results particular demographic.
In addition, the control signal system between control unit 36 and 37 can two-wayly exchange, and the described control signal 206 that this RAKE receiver is produced also is conducted to this control unit 37 equally.
The information system that is sent to this control unit 36 is used for controlling by control signal 201 this buffer storage 33, and controls these computing units 34 by control signal 202 with 203; In addition, control unit 36 is posted a letter to this computing unit 34, and the frequency pilot sign 100 related with the base station is to operate in its operator scheme; As a result, this computing unit 34 just can be based on circuit 1 or circuit 20 and is disposed.
The element numbers explanation
1 circuit (antenna)
2 STTD coding units (antenna)
3 numerical symbol unit
4 accumulators
5 accumulators
6 Delay Elements
7 Delay Elements
8 conjugate units
9 conjugate units
10 multipliers
11 multipliers
12 accumulators
13 accumulators
14 grouped elements
15 grouped elements
16 adders
17 averaging units
18 computing units
19 multipliers
31 buffer storage
32 de unit
33 buffer storage
34 computing units
35 buffer storage
36 control units
37 control units
38 address-generation units
39 digital signal processors
100 frequency pilot signs
101 frequency pilot signs
102 frequency pilot signs
103 data
104 data
105 values
200 control signals
201 control signals
202 control signals
203 control signals
204 control signals
205 values
Claims (23)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10230150.6 | 2002-07-04 | ||
| DE2002130150 DE10230150B4 (en) | 2002-07-04 | 2002-07-04 | Device and method for determining the deviation of the carrier frequency of a mobile device from the carrier frequency of a base station |
| PCT/DE2003/002026 WO2004006524A1 (en) | 2002-07-04 | 2003-06-17 | Device and method for determining the deviation of the carrier frequency of a mobile radio device from the carrier frequency of a base station |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1666483A CN1666483A (en) | 2005-09-07 |
| CN1666483B true CN1666483B (en) | 2010-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN03815785.3A Expired - Fee Related CN1666483B (en) | 2002-07-04 | 2003-06-17 | Apparatus and method for determining the deviation between the carrier frequency of a mobile wireless device and the carrier frequency of a base station |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN1666483B (en) |
| DE (1) | DE10230150B4 (en) |
| WO (1) | WO2004006524A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101184075B (en) | 2007-12-13 | 2012-01-04 | 华为技术有限公司 | Frequency deviation compensation method and device |
| CN103297977A (en) * | 2012-02-27 | 2013-09-11 | 联发科技（新加坡）私人有限公司 | Method for using cognitive radio technology in LTE mobile communication system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1321376A (en) * | 1999-09-13 | 2001-11-07 | 松下电器产业株式会社 | OFDM communication device and detecting method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6608858B1 (en) * | 2000-01-26 | 2003-08-19 | Qualcomm Incorporated | Multipath doppler adjusted frequency tracking loop |
| EP1279266A1 (en) * | 2000-05-05 | 2003-01-29 | TELEFONAKTIEBOLAGET L M ERICSSON (publ) | Method and apparatus to estimate frequency offset in a receiver |
| JP3360069B2 (en) * | 2000-08-30 | 2002-12-24 | 株式会社東芝 | Automatic frequency control circuit |
-
2002
- 2002-07-04 DE DE2002130150 patent/DE10230150B4/en not_active Expired - Fee Related
-
2003
- 2003-06-17 WO PCT/DE2003/002026 patent/WO2004006524A1/en active Application Filing
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1321376A (en) * | 1999-09-13 | 2001-11-07 | 松下电器产业株式会社 | OFDM communication device and detecting method |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10230150A1 (en) | 2004-02-05 |
| DE10230150B4 (en) | 2009-07-02 |
| WO2004006524A1 (en) | 2004-01-15 |
| CN1666483A (en) | 2005-09-07 |
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