CN1602010A - Bias frequncy estimation device and method of portable terminal - Google Patents
Bias frequncy estimation device and method of portable terminal Download PDFInfo
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Abstract
The invention is a bias frequncy estimation device and method of a portable terminal, the method comprises following process: a preparing process of receiving a quadrature phase shift keying modulation signal, performing derotation processing on the received signal by an original training sequence signal; a function process of detecting and calculating a phase of a symbol signal performed with the derotation processing, executing a function processing, obtaining a phase value, correcting errors generated from the function processing; an error removing process in which if the symbol signal exceeds a set instant detemining region and is detected, the removing is performed; a replacing process of calculating an average value of symbols adjacent to the symbol removed in the error removing process, performing interpolation; an estimation process of calculating and estimating a bias frequncy signal with a minimal minimum squared error in the symbol signals, and outputting the signal. A bias frequncy estimation accuracy is improved.
Description
Technical field
The present invention relates to the receiving terminal automatic frequency control (AFC) of Quadrature Phase Shift Keying (QPSK) modulation system portable terminal device, particularly relate to the maximum symbol error of a kind of removal, mean value with adjacent-symbol replaces, and improves the deviation frequency estimating device and the method for the portable terminal device of automatic frequency control accuracy.
Background technology
The present invention relates to the receiving terminal automatic frequency control (AFC) of Quadrature Phase Shift Keying (QPSK) modulation system portable terminal device, particularly relate to the maximum symbol error of a kind of removal, mean value with adjacent-symbol replaces, and improves the deviation frequency estimating device and the method for the portable terminal device of automatic frequency control accuracy.
Mobile communication system is utilized the limited wireless frequency resource, guarantee maximum channels, make a plurality of portable terminal devices take simultaneously and communicate, for satisfying in the several different methods that above-mentioned requirements develops, a kind of code division multiple access (CDMA:CODE DIVISION MULTIPLE ACCESS) mode is arranged, and this mode makes a plurality of portable terminal devices can use sign indicating number to divide the wireless frequency of certain frequency band of system simultaneously.
In above-mentioned code division multiple access (CDMA) mode mobile communication system, use Quadrature Phase Shift Keying (QPSK:QUADRATURE PHASE SHIFT KEYING) modulation system, on the characteristic of mobile communication system, sub-district if (CELL) zone change, the channel change that then distributes, corresponding frequencies is together change also, therefore, during recipient's received signal of above-mentioned mobile communication system, must be consistent with transmitting end channel corresponding frequencies after changing like clockwork.
When the signal in the transmission of above-mentioned mobile communication system emission side has barrier on the path that the recipient transmits, because multipath takes place in reflections etc., difference takes place in above-mentioned each path on transmission range, since the distance difference in above-mentioned path, the phase difference of generation receive frequency, so, can detect receive frequency the recipient change has taken place, in addition, because the change of receive frequency also can take place in noises etc.
When above-mentioned recipient's received signal and when carrying out analyzing and processing, share information or the contrast signal about received signal starting position identical with emission side, this mode is training sequence (TRAINING-SEQUENCE) mode.
In above-mentioned Quadrature Phase Shift Keying (QPSK) modulation system mobile communication system, in order to improve the reliability of receptivity and received signal, need a kind of technology of exploitation, utilize automatic frequency control (AFC) mode, tuning like clockwork channels transmit frequency and reception of changing with portable terminal moving in the sub-district detects the respective communication signal exactly.
The frequency offset estimation device of the portable terminal device of prior art is described with reference to the accompanying drawings.
Fig. 1 is the frequency offset estimation apparatus function pie graph of the portable terminal device of prior art, in order to the explanation prior art.
As above-mentioned shown in Figure 1, it comprises following several sections: the transfer part of untwisting (10), utilize the original training sequence signal, the training sequence signal that receives in the code division multiple access mode is carried out derotation (DE-ROTATION), the phase difference of compensation QPSK mode; Phase calculation (PHASE CALCULATION) portion 20, it detects the phase value that has been compensated the received signal of phase difference by the above-mentioned transfer part 10 of untwisting; Phase unwrapping portion (PHASE UNWRAPPING) 30, it proofreaies and correct the functional value error that takes place in the process of the above-mentioned phase calculation of calculating portion 20 detected training sequence phase values; Offset estimation portion 40, its analyzes frequency signal, estimation and output offset frequency (OFFSET FREQUENCY) value that inserts from above-mentioned phase unwrapping portion 30.
With reference to the accompanying drawings, describe portable terminal device frequency offset estimation device under the prior art that as above constitutes in detail.
The above-mentioned received training sequence signal that transfer part 10 input receives through multipath from the side of emission, that be out of shape because of noise that untwists, in addition, the identical original training sequence (TRAINING SEQUENCY) that input is shared with above-mentioned emission.
If analyze above-mentioned original training sequence, can confirm the QPSK phase value of above-mentioned received signal, utilize above-mentioned affirmation phase value to carry out derotation (DE-ROTATION), thus the phase place of compensation QPSK signal.
Utilizing above-mentioned training sequence compensation of phase difference is on the training sequence signal that receives, and the value that multiply by in the following manner with original training sequence value conjugation (CONJUGATE) obtains.
Trot(k)＝Tr(k)T
*o(k)， k＝1，...，N
: Trot (k); The derotation value
Tr (k); The training sequence value that receives
T
*O (k); The original conjugate of training sequence signal
N; The length of training sequence (144 symbols)
As mentioned above, the received signal (Trot (k)) that has been compensated phase value by the transfer part 10 of untwisting is access in phase calculation portion 20, detects the phase error (OFFSET) that takes place because of multipath or noise etc., carries out following calculating (CALCULATION).
θ (k)=ARCTAN 2 (Q (k), I (k)); Q is an imaginary part, and I is a real part
As above the phase value of Ji Suaning (θ (k)) has-value range of π＜θ (k)＜π because of the ARCTAN2 function, so, may take place in above-mentioned θ (k) sequence ± difference in the calculating of 2 π.
As above carry out that the ARCTAN2 function is handled and the phase value (θ (k)) of output is access in above-mentioned phase unwrapping portion 30 in phase calculation portion 20, confirm whether the above-mentioned phase value (θ (k)) and the difference of former phase value (θ (k-1)) surpass the π value, when above-mentioned affirmation result is when having surpassed the π value, then add ± expansion (UNWRAPPING) of 2 π handles, and proofreaies and correct the difference that produces because of the ARCTAN2 function calculation.
Be access in offset estimation portion 40 from the phase value (θ (k)) of above-mentioned phase unwrapping portion 30 outputs, calculation deviation frequency (FREQUENCY OFFSET) Δ f and output, the corresponding function portion that does not mark among the figure handles above-mentioned deviation frequency, carries out automatic frequency control (AFC).
Automatic frequency control (AFC) mode of above-mentioned prior art is to utilize receive frequency training sequence (TRAINING SEQUENCY) signal merely, calculates the frequency difference (FREQUENCY DIFFERENCY) that deviation frequency causes.
Therefore, there are the following problems for above-mentioned prior art, promptly, when containing in the training sequence signal of receive frequency than serious mistake (ERROR), detected deviation frequency calculated value there is considerable influence, has reduced the accuracy of receive frequency, reduced the reliability of mobile communication system.
Summary of the invention
The objective of the invention is to, calculate at the deviation frequency that the receiving terminal Automatic Frequency Control of Quadrature Phase Shift Keying modulation system mobile communication system portable terminal device is required, a kind of deviation frequency estimating device and method of portable terminal device are provided, remove the received training sequence signal that takes place above the mistake of allowed band, the mean value of interpolation adjacent-symbol, the deviation frequency of output high-reliability.
For achieving the above object, feature of the present invention is to comprise following several sections: the transfer part of untwisting, and it is processed into the training sequence symbols signal to the mark signal of wireless receiving, the phase difference of compensation Quadrature Phase Shift Keying modulation system signal; Phase calculation portion, its input untwist the transfer part compensation the signal of phase difference, detect phase value; Phase unwrapping portion, it proofreaies and correct the error of the function calculation process generation of the detected phase value of described phase calculation portion; Error detection portion, its is analyzed from the signal of described phase unwrapping portion input, removes the regional detected mark signal outside the decision zone; Interpolation portion, it obtains the mean value of adjacent-symbol signal, replaces the mark signal of being removed by described error detection portion; Offset estimation portion, least squares error minimum, the deviation frequency estimated value that is bordering on straight line and the output of the mark signal that its calculation inserts from described interpolation portion.
In addition, for realizing described purpose, another feature of the present invention is to comprise following plurality of processes: set-up procedure, and utilize the portable terminal device receiving code to divide multi-access mode Quadrature Phase Shift Keying modulation signal, utilize the original training sequence signal, the signal that receives is carried out derotation handle; Functional procedure, detection computations is obtained phase value in the phase place of described process through the mark signal of derotation processing by the function processing, proofreaies and correct the error that produces because of described function processing; The debug process if the mark signal of described process exceeds the set decision zone of setting and is detected, is then removed; The replacement process, the adjacent-symbol mean value of the symbol that calculation is removed in described debug process carries out interpolation and handles; Estimation process is exported in the mark signal calculation of described process and the deviation frequency signal of estimation least squares error minimum.
Description of drawings
Fig. 1 is the portable terminal device frequency offset estimation apparatus function pie graph of prior art;
Fig. 2 is the deviation frequency estimating device function constitution map of portable terminal device of the present invention;
Fig. 3 is the decision zone state diagram that error differentiating mark signal of the present invention detects;
Fig. 4 is the deviation frequency evaluation method flow chart of portable terminal device of the present invention.
The symbol description of accompanying drawing major part
100: the transfer part 110 of untwisting: phase calculation portion
120: phase unwrapping portion 130: error detection portion
140: interpolation portion 150: offset estimation portion
Embodiment
With reference to the accompanying drawings, deviation frequency estimating device and the method that is used for the receiving terminal Automatic Frequency Control of portable terminal device of the present invention is described.
Fig. 2 is the deviation frequency estimating device function constitution map of portable terminal device of the present invention, Fig. 3 is the decision zone state diagram that error differentiating mark signal of the present invention detects, Fig. 4 is the deviation frequency evaluation method flow chart of portable terminal device of the present invention, and above-mentioned accompanying drawing is used to illustrate the present invention.
As above-mentioned shown in Figure 2, the deviation frequency estimating device that is used for portable terminal device receiving terminal Automatic Frequency Control (AFC:AUTOMATIC FREQUENCY CONTROL) of the present invention is made of following several sections: the transfer part 100 of untwisting, it is used for the mark signal of wireless receiving is processed into the training sequence symbols signal, the phase difference of compensation Quadrature Phase Shift Keying (QPSK) modulation system signal, it analyzes the original training sequence symbols signal of sharing with emission side, the phase value of utilization through confirming, the Quadrature Phase Shift Keying modulation system phase difference that compensation has been provided with in the training sequence symbols signal of above-mentioned wireless receiving input;
Phase unwrapping portion 120, it is used to proofread and correct the error that the function calculation process of above-mentioned phase calculation portion 110 detected phase values takes place, and compensation is calculated the error that takes place because of each mark signal being carried out arc tangent (ARCTAN2) function;
Error detection portion 130, it analyzes the signal of above-mentioned phase unwrapping portion 120 inputs, the mark signal that the zone of removal outside the decision zone distinguished according to following standard, promptly " | θ (k)-θ (k-1) |＞π/4; wherein; the detected phase value of θ (k) is-symbol, k is the number of training sequence symbols signal ";
Interpolation portion 140, it is used to obtain the mean value of mark signal, the mark signal that replacement is removed by above-mentioned error detection portion 130 when the mark signal of above-mentioned removal is discontinuous, averages calculating with following benchmark, i.e. " k is the number of training sequence symbols signal for hat θ (k)=(θ (k-1)+θ (k+1))/2; wherein, the detected phase value of θ (k) is-symbol ", the value that interpolation calculates replaces removed mark signal value.Mark signal consecutive hours when above-mentioned removal averages calculating with following benchmark, i.e. " the symbol phase of makeing mistakes; θ (k+1), θ (k+2) ..., θ (k+E), θ (k+i)=θ (k)+I
*Δ θ, so, Δ θ=(θ (k+E+1)-θ (k))/(E+1), I is 1,2 .., E, the detected phase value of θ (k) is-symbol, k is the number of training sequence symbols signal ", the value that interpolation calculates replaces removed mark signal value;
Offset estimation portion, it is used to calculate deviation frequency estimated value and the output that the least squares error (LEAST SQUARE ERROR) of the mark signal that inserts from above-mentioned interpolation portion 140 is minimum, be bordering on straight line, it according to following benchmark estimate the incoming symbol signal of above-mentioned access the least squares error minimum, be bordering on the deviation frequency of straight line, i.e. " (Ak+B) θ (k) of Δ f=∑ k=1 to N; A=12/ (T (N-1) N (N+1)); B=-6/ (T (N-1) N); N is the training sequence symbols signal length, and k is the number of training sequence symbols signal ".
With reference to the accompanying drawings, the present invention who describes above-mentioned formation in detail is used for the deviation frequency estimating device of portable terminal device receiving terminal Automatic Frequency Control (AFC).
Above-mentioned derotation (DE-ROTATION) portion 100 in the training sequence symbols signal that output receives by wireless path, the shared original training sequence symbols signal that output valve is identical with emission side.
Above-mentioned training sequence symbols signal utilizes Quadrature Phase Shift Keying (QPSK) modulation system, is divided into the signal with 4 phase differences and transmits, being shared by emission side and recipient for information about of above-mentioned order about phase difference.
That is, under above-mentioned training sequence mode, the recipient has known that in advance emission side carries out wireless transmission with the training sequence symbols signal with certain phase place (PHASE).
At the training sequence symbols signal of above-mentioned Quadrature Phase Shift Keying (QPSK) modulation system from the side's of emission wireless transmission, because the decline (FADING) of wireless path and noise (NOISE) etc. are in the error or the deviation frequency (OFFSET FREQUENCY) of transmission course occurrence frequency microsecond change.
In addition, even the recipient is accurately consistent with the frequency signal of emission side's emission, but because error (OFFSET) also can take place in condition differences such as the characteristic of the characteristic of each equipment, each accessory element, degree of aging, environment for use on recipient's frequency configuration.
Therefore, because the characteristic of above-mentioned wireless propagation path decline and noise, each equipment, the characteristic of each accessory element, degree of aging, environment for use etc., recipient in the receiver, transmitting frequency, error or deviation frequency (FREQUENCY OFFSET) take place in the channel frequency, in order to improve the quality of signal of communication, need control (CONTROL) that the frequency of above-mentioned generation error is carried out tuning (TUNING), carrying out the above-mentioned tuning automatic frequency control (AFC) that calls automatically.
The invention provides a kind of deviation frequency estimating device and method, above-mentioned portable terminal device (MS) is to base station (BS:BASE STATION) transmission that constitutes mobile communication system or the wireless signal that receives from the base station, owing to the problem of the characteristic of the problem on the wireless propagation path, equipment and generations such as accessory characteristic and degree of aging, use the surrounding environment change of equipment that deviation frequency (FREQUENCY OFFSET) takes place, the present invention detects this deviation frequency, make automatic frequency control (AFC) device accurately be tuned to receive frequency.
Above-mentioned Quadrature Phase Shift Keying (QPSK) modulation system is with 4 phase places (PHASE) modulated transmission signal and output, real part and several portion are wherein arranged, symbol (SYMBOL) is used to make emission side and recipient to share the phase place of the signal of above-mentioned modulation transmissions in advance, carries out transmission manner according to this symbol (SYMBOL) order and is called as training sequence (TRAINING SEQUENCY) mode.
The training sequence symbols signal of sharing with the training sequence symbols signal of above-mentioned emission side wireless transmission is access in the transfer part 100 of untwisting, the training sequence symbols signal of sharing is analyzed in the above-mentioned transfer part 100 of untwisting, and confirms that emission side utilizes quadrature phase shift key QPSK prosecutor formula to be provided with the phase difference of phase change.
The above-mentioned transfer part 100 of untwisting utilizes the phase difference value of as above confirming, the phase difference of compensation received signal.
The compensation of as above phase difference is on the phase place of the training sequence symbols signal that receives, and the multiply each other phase place of original training sequence symbols signal of conjugation (CONJUGATE) is handled.
That is, the received training sequence mark signal is Tr (k), and the original training sequence symbols signal of sharing is To (k), k is-symbol sequence number, if 1 to 144, so, the signal Trot (k) that above-mentioned derotation is handled presses Trot (k)=Tr (k) T
*O (k) handles, so be easy to obtain.
Above-mentioned phase calculation portion 110 is according to the certain benchmark of phase value (θ (k)), and detection computations is calculated each mark signal that has as above been compensated the Quadrature Phase Shift Keying modulation system of phase difference by the transfer part 100 of untwisting.
By the phase value (θ (k)) of above-mentioned phase calculation portion 110 detected each mark signal because real part (I (k)) and imaginary part (Q (k)) are arranged, tackle above-mentioned real part (I (k)) and imaginary part (Q (k)) carries out function calculation, above-mentioned phase unwrapping portion 120 carries out the function calculation of ARCTAN2 (I (k), Q (k)).
The function calculation of above-mentioned ARCTAN2 (I (k), Q (k)) since the end value scope be-π＜θ (k)＜π, so phase value θ (k) may take place ± difference about 2 π.
Therefore, confirm whether present phase value θ (k) and the difference of former phase value θ (k-1) surpass the π value, when surpassing above-mentioned π value, should be according to the symbol of above-mentioned present phase value θ (k), add (+) or subtract about the π of (-) ± 2, above-mentioned processing is called as expansion (UNWRAPPING) to be handled, and carries out this processing by above-mentioned phase unwrapping portion 120.
If analyze the phase value θ (k) of the Quadrature Phase Shift Keying symbol that above-mentioned phase unwrapping portion 120 handles, can estimate (ESTIMATION) deviation frequency (Δ f), but may there be the mismark that surpasses wrong allowed band in above-mentioned phase value θ (k), above-mentioned mismark will cause deviation frequency (Δ f) estimation (ESTIMATION) inaccurate, so detected and remove by above-mentioned error detection portion 130.
Have both decision zones (DECISION REGION) in phase bit (PHASE) zone in order to detect above-mentioned Quadrature Phase Shift Keying mismark, to be provided with, the detected symbol in phase place zone outside above-mentioned decision zone is listed in mismark.
In above-mentioned Fig. 3, drawn the decision zone that error differentiating mark signal of the present invention detects, the phase place zone that exceeds above-mentioned decision zone is divided by following benchmark.
|θ(k)-θ(k-1)|＞π/4
Wherein, k is 1 to 144 symbol
Said reference use the estimated range of proper symbol be limited in ± π/4 in, be easier to the error differentiating symbol, be put into the symbol that has the mistake phase place with the corresponding symbol of said reference, detected and remove by above-mentioned error detection portion 130.
For example, China uses 144 chips (CHIP) as training sequence symbols as TD-SCDMA (TD SDMA) mode of mobile communication system standard, so, can obtain 144 phase values (θ (k)).
But, if use LEAST SQUARE ERROR mode, then need the whole phase value of phase sequence, so, the phase value that needs the above-mentioned error detection of replacement portion 130 to remove.
140 pairs of replacements of above-mentioned interpolation portion are performed calculations by the phase value of the symbol of above-mentioned error detection portion 130 deletions, and carry out interpolation (INTERPOLATION) and replace, when the phase value of above-mentioned deleted symbol is one, the phase value (θ (k-1)) of former symbol and the phase value (θ (k+1)) of later symbol are averaged calculation, be estimated as the normal phase place value, the phase value that interpolation is estimated through above-mentioned calculating operation average.
Above-mentioned phase value by 140 pairs of former symbols of interpolation portion and later symbol averages calculation, and the procedural representation that is estimated as the normal phase place value is as follows.
hatθ(k)＝(θ(k-1)+θ(k+1))/2
In addition, when above-mentioned error detection portion 130 detected the symbol error that recurs, the difference of symbol phase value and next symbol phase value was carried out interpolation as the evaluation phase value of equalization before above-mentioned interpolation portion 140 detected.
For example, make mistakes, when detected symbol numbers is E, carry out following estimation when recurring.
The phase place of mismark: θ (k+1), θ (k+2) ..., θ (k+E)
θ(k+i)＝θ(k)+i
*Δθ
Wherein, I is 1,2 ..E
Δ θ is (θ (k+E+1)-θ (k))/(E+1)
The respective symbol position that as above is incorporated into deletion by interpolation portion 140 estimated symbols phase values is replaced, and as above the phase value about all 144 symbols by 140 outputs of interpolation portion is access in offset estimation portion 150.
The deviation frequency estimation device of above-mentioned Quadrature Phase Shift Keying receiver uses the phase sequence (θ (k)) about the training sequence that receives, not have on the wireless path of signal transmission to decline (FADING) or the state of noise (NOISE) if be in, the phase sequence that receives has and the proportional linear characteristic of deviation frequency (FREQUENCY OFFSET) Δ f, can be expressed as follows.
θ(k)＝2πΔfT+θo
Wherein, θ o is arbitrary phase skew (ARBITRARY PHASE OFFSET) value
The T is-symbol cycle (SYMBOL PERIOD, about 0.78125)
But generally speaking, owing to have decline (FADING) or noise (NOISE) in wireless propagation path (PATH) or the channel, above-mentioned linear characteristic is distorted, what estimate is the most approximate straight line, promptly estimate deviation frequency (FREQUENCY OFFSET) the Δ f of LEAST SQUAREERROR minimum, above-mentioned LEAST SQUARE ERROR is expressed as follows:
ε=∑ k=1 to N[θ (k)-(Δ fkT+hat θ)] square
For deviation frequency (FREQUENCY OFFSET) the Δ f that searches above-mentioned ε minimum, taked the differential of ε/Δ f form, above-mentioned offset estimation portion 150 is by following process estimation deviation frequency Δ f.
Δ f=∑ k=1 to N (Ak+B) θ (k),
Wherein, A=12/ (T (N-1) N (N-1))
B＝-6/(T(N-1)N)
In the receiving terminal automatic frequency control (AFC) of Quadrature Phase Shift Keying (QPSK) modulation system portable terminal device, as above the present invention of Gou Chenging is easy to remove the symbol that makes a mistake, mean value with reference numeral carries out interpolation (INTERPOLATION), guaranteed the deviation frequency Δ f of LEAST SQUARE ERROR minimum, so can carry out the higher FREQUENCY CONTROL of accuracy to receiving terminal.
Below with reference to above-mentioned Fig. 4, the deviation frequency evaluation method of portable terminal device of the present invention is described.
Set-up procedure, this process is in code division multiple access (CDMA) or TD-SCDMA mode mobile communication system, when the portable terminal device wireless receiving signal of Quadrature Phase Shift Keying (QPSK) modulation is carried out in utilization, according to original training sequence (TRAINING SEQUENCE) signal the signal that receives is carried out derotation and handle.This process comprises following two process: process 1S100 again, judges whether above-mentioned portable terminal device receives the Quadrature Phase Shift Keying modulation signal; Process 2 is S110, and when said process S100 judged that identification receives the Quadrature Phase Shift Keying modulation signal, according to original training sequence signal, the derotation (DE-ROTATION) of carrying out phase difference is compensated was handled;
Functional procedure S120, this process is that above-mentioned set-up procedure is carried out detection computations through the phase place (PHASE) of the mark signal of derotation processing, handles by function and obtains phase value, proofreaies and correct above-mentioned function and handles the error that is produced.Detailed process is: the phase place that detects and calculate the signal of above-mentioned input, carrying out arc tangent 2 (ARCTAN2) function handles, obtain phase value (θ (k)), because handling, above-mentioned function has-π＜phase value＜π scope, in order to proofread and correct the error of generation, according to the symbol of above-mentioned phase value, the expansion (UNWRAPPING) that adds or deduct 2 π values is handled;
Debug process, this process are to have exceeded the set decision zone that is provided with if detect the mark signal of above-mentioned functional procedure S120, then remove.It comprises following two process: process 3S120 again, judges whether mark signal that above-mentioned functional procedure S120 has carried out launching to handle exceeds set decision zone and be detected; Process 4S140 thinks that mark signal exceeds the decision zone and is detected if said process S130 judges, then being judged as is mismark, removes;
Replacement process, this process are the adjacent-symbol signal averagings of the removed symbol of the above-mentioned debug process of calculation, carry out interpolation and handle.It comprises following two processes again: process 6 is S150, when the mark signal of above-mentioned debug process removal is discontinuous, according to following benchmark calculating mean value, i.e. " hat θ (k)=(θ (k-1)+θ (k+1))/2; wherein; the phase value that θ (k) is-symbol detects, k is the number of training sequence symbols signal ".Mark signal consecutive hours when above-mentioned debug process is removed calculates mean value according to following benchmark, promptly " symbol phase of makeing mistakes is θ (k+1), θ (k+2) ..., θ (k+E), θ (k+i)=θ (k)+I
*Δ θ, wherein, Δ θ=(θ (k+E+1)-θ (k))/(E+1), I is 1,2 .., E, the phase value that θ (k) is-symbol detects, k is the number of training sequence symbols signal ", calculate adjacent-symbol mean value and output with this; Process 6 is S160, and the mean value interpolation that utilizes said process S150 calculation is in the value of symbol position of removing;
Estimation process S170, this process is to least squares error minimum in the mark signal of above-mentioned replacement process, the deviation frequency signal that is bordering on straight line perform calculations estimation and output, it has process: estimate that above-mentioned interpolation is handled and the least squares error minimum of the mark signal of input, be bordering on the deviation frequency of straight line according to following benchmark, Δ f=∑ k=1 to N (Ak+B) θ (k) promptly "; wherein; A=12/ (T (N-1) N (N+1)); B=-6/ (T (N-1) N); N is the length of training sequence symbols signal, and k is the number of training sequence symbols signal ".
With reference to the accompanying drawings, describe the portable terminal device deviation frequency evaluation method of the present invention that as above constitutes in detail.
For example, when being TD-SCDMA mode mobile communication system, with the information of 144 chips (CHIP) or symbol (SYMBOL) formation some cycles, so above-mentioned training sequence information is made of 144 symbolic units.
Training sequence frequency signal from emission side's wireless transmission of above-mentioned mobile communication system, because phase place (PHASE) difference takes place the recipient in the characteristic of decline that takes place by wireless propagation path and noise, reception emission signal equipment and environment for use variation etc.
If detect the phase difference that as above takes place, the difference value of the receive frequency of then confirming tranmitting frequency and being provided with now, be deviation frequency value (Δ f), utilize as above difference value or deviation frequency value (Δ f) can carry out tuning (TUNING) exactly, generally be to utilize automatic reception FREQUENCY CONTROL (AFC), the present invention searches just and is used for as above accurately tuning required deviation frequency.
Above-mentioned portable terminal device adds mobile communication system and registration, communicates, and for example, adds code division multiple access (CDMA) mode or TD-SCDMA mode mobile communication system, with the other side's radio communication.
Judge whether above-mentioned portable terminal device receives the Quadrature Phase Shift Keying modulation system signal S100 of input from the transmission of the side of emission, when above-mentioned judgement S100 assert input Quadrature Phase Shift Keying modulated received signal, utilization is compensated derotation (DE-ROTATION) treatment S 110 of phase value based on the phase value of original training sequence by the signal of the 100 pairs of above-mentioned reception inputs in transfer part of untwisting.
Above-mentioned code division multiple access or TD-SCDMA mode mobile communication system are utilized Quadrature Phase Shift Keying (QPSK) modulation system, use the training sequence mode, the phase information of the signal that shared emission side of training sequence mode and recipient are transmitted mutually, utilize the Quadrature Phase Shift Keying mode that the conversion of signals of emission is become 4 kinds of phase places and transmission, emission side and recipient share the phase information after the conversion.So the recipient knows the phase information of the corresponding signal of emission side's wireless transmission in advance, the phase information of as above Quadrature Phase Shift Keying shared call training sequence.
By as above derotation treatment S 110, phase value with 144 mark signals of Quadrature Phase Shift Keying modulation system of 4 phase values is realized identical, detect and calculate each phase value by phase calculation portion 110, carrying out arc tangent 2 functions by 120 pairs of real parts of phase unwrapping portion and imaginary part handles, simultaneously, above-mentioned function is handled the error that takes place launch to handle, compensate S120.
Signal by said process S120 processing; in passing through the process of wireless transmission path, because of serious decline or severe noise etc., some has been with improper or wrong phase value; so, confirm and detect whether have the mismark S130 that has this wrong phase value.
In the process that detects above-mentioned mismark, utilize the decision zone of above-mentioned Fig. 3, regional detected symbol is a mismark outside above-mentioned decision zone (DECISION REGION).
When as above detecting the mismark that has the mistake phase value, delete corresponding mismark S140, above-mentioned interpolation portion 140 reaches minimum in order to make LEAST SQUARE ERROR, the value of averaging calculation is handled, obtain mean value S150 from the adjacent-symbol value of the symbol of above-mentioned removal or deletion, the mean value that utilizes as above calculation to handle replaces, and is incorporated into the middle S160 of value of symbol (INTERPOLATION) of above-mentioned deletion.
In the process of the above-mentioned mean value of obtaining adjacent-symbol, when the symbol that is detected and deletes as mismark discontinuous, when only taking place one, according to the mean value of following benchmark calculation adjacent-symbol.
hatθ(k)＝(θ(k-1)+θ(k+1))/2
: θ (k); The phase value of symbol detection
: k; The number of training sequence symbols signal
In addition, in the process of obtaining above-mentioned adjacent-symbol mean value, when the symbol consecutive hours that is detected and deletes as mismark, according to the mean value of following benchmark calculation adjacent-symbol.
The symbol phase of makeing mistakes; θ (k+1), θ (k+2) .., θ (k+E)
θ(k+i)＝θ(k)+i
*Δθ
：Δθ＝(θ(k+E+1)-θ(k))/(E+1)
：i；1，2，..，E
: θ (k); The phase value of symbol detection
: k; The number of training sequence symbols signal
As above perform calculations and signal that interpolation is handled is access in above-mentioned offset estimation portion 150, make the deviation frequency (FREQUENCY OFFSET) of LEAST SQUARE ERROR minimum according to following benchmark estimation (ESTIMATION).
ε=∑ k=1 to N[θ (k)-(Δ fkT+hat θ)] square
Δ f=∑ k=1 to N (Ak+B) θ (k)
：A＝12/(T(N-1)N(N+1))
：B＝-6/(T(N-1)N)
: N; The length of training sequence symbols signal
: k; The number of training sequence symbols signal
So, at the deviation frequency (Δ f) of estimating that (ESTIMATION) takes place because of wireless propagation path, the invention described above utilization decision zone (DECISION REGION), easier detection and remove out mismark, phase value to adjacent-symbol averages processing and interpolation processing, thereby make LEAST SQUARE ERROR reach minimum, the higher deviation frequency of estimation accuracy.
As above the present invention of Gou Chenging has following industrial result of use, that is, utilize the decision zone to detect the mismark signal of Quadrature Phase Shift Keying modulation system received signal, is easy to detect and remove the mark signal of improper reception.
In addition, also have following industrial result of use, that is, the adjacent-symbol phase value that detects the mismark of removing is averaged processing and interpolation, realized making least squares error to reach minimum deviation frequency estimation.
In addition, also has the convenient effect in the following use, promptly, be easy to detect and remove mismark, the average phase value of calculation and interpolation adjacent-symbol, the deviation frequency of estimation least squares error minimum, so, estimation and tranmitting frequency be tuning receive frequency accurately, has improved the reliability of portable terminal device, has improved communication quality.
Above embodiment only is used to illustrate the present invention, but not is used to limit the present invention.
Claims (16)
1. the deviation frequency estimating device of a portable terminal device is characterized in that by constituting as the lower part:
The transfer part of untwisting, it is processed into the training sequence symbols signal to the mark signal of wireless receiving, compensation Quadrature Phase Shift Keying modulation system signal phase difference;
Phase calculation portion, its imports the signal that the transfer part of untwisting has compensated phase difference, detects phase value;
Phase unwrapping portion, it proofreaies and correct the error that the detected phase value of described phase calculation portion takes place in the function calculation process;
Error detection portion, its is analyzed from the signal of described phase unwrapping portion input, removes the regional detected mark signal outside the decision zone;
Interpolation portion, it obtains the mean value of adjacent-symbol signal, replaces the mark signal of being removed by described error detection portion;
Offset estimation portion, it performs calculations to the least squares error minimum of the mark signal drawn in from described interpolation portion, the deviation frequency estimated value that is bordering on straight line and exports.
2. the deviation frequency estimating device of portable terminal device according to claim 1 is characterized in that:
Analyze the original training sequence symbols signal that described derotation is partly analysed and share the side of emission, utilize the phase difference of confirming, in the training sequence symbols signal of described wireless receiving and input, the Quadrature Phase Shift Keying modulation system phase difference that compensation has been provided with;
Described phase calculation portion has compensated the mark signal of Quadrature Phase Shift Keying modulation system phase difference and input at the described transfer part of untwisting, and detects and calculate the phase value that takes place because of decline and noise;
Described phase unwrapping portion carries out arctan function calculation, the error that compensation takes place to each mark signal.
3. the deviation frequency estimating device of portable terminal device according to claim 1 is characterized in that:
Described error detection is partly analysed from the mark signal of described phase unwrapping portion input, when the zone outside the decision zone that is being provided with detects, removes the respective symbol signal.
4. the deviation frequency estimating device of portable terminal device according to claim 3 is characterized in that: described error detection portion is according to following benchmaring and remove mark signal outside the decision zone that has been provided with; Described benchmark is:
|θ(k)-θ(k-1)|＞π/4；
: θ (k); The phase value of symbol detection;
: k; The number of training sequence symbols signal.
5. the deviation frequency estimating device of portable terminal device according to claim 1, it is characterized in that: described interpolation portion reads the adjacent-symbol signal value of the mark signal of being removed by described error detection portion and carries out calculating operation average, replaces removed mark signal value with described mean value.
6. the deviation frequency estimating device of portable terminal device according to claim 5 is characterized in that: when the mark signal of removing when described error detection portion was discontinuous, described interpolation portion utilized the mean value of obtaining according to following standard to replace removed mark signal value; Described standard is:
hatθ(k)＝(θ(k-1)+θ(k+1))/2；
: θ (k); The phase value of symbol detection;
: k; The number of training sequence symbols signal.
7. the deviation frequency estimating device of portable terminal device according to claim 5 is characterized in that: when the mark signal consecutive hours that described error detection portion removes, described interpolation portion utilizes the mean value of obtaining according to following benchmark to replace the mark signal value of removing; Described benchmark is:
The symbol phase of makeing mistakes; θ (k+1), θ (k+2) ..., θ (k+E);
θ(k+i)＝θ(k)+i
*Δθ；
：Δθ＝(θ(k+E+1)-θ(k))/(E+1)；
：i；1，2，..，E；
: θ (k); The phase value of symbol detection;
: k; The number of training sequence symbols signal.
8. the deviation frequency estimating device of portable terminal device according to claim 1 is characterized in that: described offset estimation portion according to following benchmark estimate the mark signal of described interpolation portion input the least squares error minimum, be bordering on the deviation frequency of straight line; Described benchmark is:
Δ f=∑ k=1 to N (Ak+B) θ (k);
：A＝12/(T(N-1)N(N+1))；
：B＝-6/(T(N-1)N)；
: N; The length of training sequence symbols signal;
: k; The number of training sequence symbols signal.
9. the deviation frequency evaluation method of a portable terminal device is characterized in that being made of following plurality of processes:
Set-up procedure utilizes the portable terminal device receiving code to divide multi-access mode Quadrature Phase Shift Keying modulation signal, utilizes original training sequence signal, carries out derotation to received signal and handles;
Functional procedure, detection computations are obtained phase value through the phase place of the mark signal of described derotation processing by the function processing, proofread and correct the error that produces because of described function processing;
The debug process if the mark signal of described process exceeds the set decision zone of setting and is detected, is then removed;
The replacement process, the adjacent-symbol mean value of the symbol that calculation is removed in described debug process carries out interpolation and handles;
Estimation process, calculate and estimate least squares error minimum in the mark signal of described process, the deviation frequency signal that is bordering on straight line exports.
10. the deviation frequency evaluation method of portable terminal device according to claim 9, it is characterized in that: described set-up procedure also comprises following two processes:
Process 1 judges whether code division multiple access mode portable terminal device receives the Quadrature Phase Shift Keying modulation signal;
Process 2 when described process is judged as reception Quadrature Phase Shift Keying modulation signal, is utilized original training sequence signal, and the derotation that compensates phase difference is handled.
11. the deviation frequency evaluation method of portable terminal device according to claim 9, it is characterized in that: described functional procedure is carried out detection computations to the phase place of the signal of described set-up procedure input, carrying out arc tangent 2 functions handles, obtain phase value, because handling, described function has-π＜phase value＜π scope, in order to proofread and correct the error of generation, handle according to the add deduct expansion of 2 π values of the symbol of described phase value.
12. the deviation frequency evaluation method of portable terminal device according to claim 9 is characterized in that: described debug process also comprises following two processes:
Process 1 judges whether the mark signal that launches to handle through described functional procedure exceeds set decision zone and be detected;
Process 2 thinks that mark signal exceeds the decision zone if described process is judged, is judged as mismark, then removes.
13. the deviation frequency evaluation method of portable terminal device according to claim 9 is characterized in that: described replacement process also comprises following two processes:
Process 1, the adjacent-symbol mean value and the output of calculating the symbol of described debug process removal;
Process 2, the mean value that utilizes described process to calculate, interpolation is in the value of symbol position of removing.
14. the deviation frequency evaluation method of portable terminal device according to claim 13 is characterized in that:
In described mean value calculation output procedure, when the mark signal of described removal is discontinuous, according to following benchmark calculation mean value; Described benchmark is:
hatθ(k)＝(θ(k-1)+θ(k+1))/2；
: θ (k); The phase value of symbol detection;
: k; The number of training sequence symbols signal.
15. the deviation frequency evaluation method of portable terminal device according to claim 13 is characterized in that: in described mean value calculation output procedure, when the mark signal consecutive hours of described removal, according to following benchmark calculation mean value; Described benchmark is:
The symbol phase of makeing mistakes; θ (k+1), θ (k+2) ..., θ (k+E);
θ(k+i)＝θ(k)+i
*Δθ；
：Δθ＝(θ(k+E+1)-θ(k))/(E+1)；
：i；1，2，..，E；
: θ (k); The phase value of symbol detection;
: k; The number of training sequence symbols signal.
16. the deviation frequency evaluation method of portable terminal device according to claim 9, it is characterized in that: described estimation process is according to following benchmark, to described replacement process through interpolation handle the least squares error minimum of the mark signal of input, the deviation frequency that is bordering on straight line is estimated; Described benchmark is:
Δ f=∑ k=1 to N (Ak+B) θ (k);
：A＝12/(T(N-1)N(N+1))；
：B＝-6/(T(N-1)N)；
: N; The length of training sequence symbols signal;
: k; The number of training sequence symbols signal.
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| KR1020030067018 | 2003-09-26 | ||
| KR10-2003-0067018 | 2003-09-26 | ||
| KR1020030067018A KR100556892B1 (en) | 2003-09-26 | 2003-09-26 | A method and a apparatus of frequency offset estimation for mobile phone |
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| CN1602010A true CN1602010A (en) | 2005-03-30 |
| CN100536451C CN100536451C (en) | 2009-09-02 |
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|---|---|---|---|
| CNB2004100372369A Expired - Fee Related CN100536451C (en) | 2003-09-26 | 2004-04-29 | Bias frequncy estimation device and method of portable terminal |
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| KR (1) | KR100556892B1 (en) |
| CN (1) | CN100536451C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101262628B (en) * | 2007-03-08 | 2010-12-22 | 鼎桥通信技术有限公司 | A modulation processing method and transmission device for transmitting data in multi-carrier system |
| CN1980079B (en) * | 2005-11-09 | 2011-09-21 | Lg电子株式会社 | Method and apparatus for estimating frequency offset in mobile communications system |
| CN103686819A (en) * | 2012-09-21 | 2014-03-26 | 晨星软件研发(深圳)有限公司 | Frequency error estimation method |
| CN104219185A (en) * | 2014-08-25 | 2014-12-17 | 武汉光迅科技股份有限公司 | Line width compensation method and line width compensation module applied to DQPSK (differential quadrature phase shift keying) system |
| WO2016192321A1 (en) * | 2015-06-03 | 2016-12-08 | 深圳市中兴微电子技术有限公司 | Phase ambiguity correction method and device, and computer storage medium |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100723528B1 (en) * | 2006-04-21 | 2007-05-30 | 삼성전자주식회사 | Method and apparatus for estimating offset frequency |
| KR101013082B1 (en) * | 2007-10-05 | 2011-02-14 | 한국철도기술연구원 | phase and frequency detector for controlling converter |
| KR101234994B1 (en) * | 2011-02-18 | 2013-02-20 | 한양대학교 산학협력단 | Frequency Discriminator and Method for |
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2003
- 2003-09-26 KR KR1020030067018A patent/KR100556892B1/en not_active IP Right Cessation
-
2004
- 2004-04-29 CN CNB2004100372369A patent/CN100536451C/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1980079B (en) * | 2005-11-09 | 2011-09-21 | Lg电子株式会社 | Method and apparatus for estimating frequency offset in mobile communications system |
| CN101262628B (en) * | 2007-03-08 | 2010-12-22 | 鼎桥通信技术有限公司 | A modulation processing method and transmission device for transmitting data in multi-carrier system |
| CN103686819A (en) * | 2012-09-21 | 2014-03-26 | 晨星软件研发(深圳)有限公司 | Frequency error estimation method |
| CN103686819B (en) * | 2012-09-21 | 2016-08-10 | 晨星软件研发(深圳)有限公司 | The estimating and measuring method of frequency error |
| CN104219185A (en) * | 2014-08-25 | 2014-12-17 | 武汉光迅科技股份有限公司 | Line width compensation method and line width compensation module applied to DQPSK (differential quadrature phase shift keying) system |
| CN104219185B (en) * | 2014-08-25 | 2018-06-15 | 武汉光迅科技股份有限公司 | A kind of line width compensating module and its compensation method applied to DQPSK systems |
| WO2016192321A1 (en) * | 2015-06-03 | 2016-12-08 | 深圳市中兴微电子技术有限公司 | Phase ambiguity correction method and device, and computer storage medium |
| CN106301666A (en) * | 2015-06-03 | 2017-01-04 | 深圳市中兴微电子技术有限公司 | A kind of phase ambiguity bearing calibration and device |
| CN109155670A (en) * | 2016-03-22 | 2019-01-04 | 西格弗克斯公司 | A method of passing through the aborning error of end correction frequency of wireless telecommunication system |
| CN109155670B (en) * | 2016-03-22 | 2021-09-21 | 西格弗克斯公司 | Method for correcting error in frequency generation by terminal of wireless communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100536451C (en) | 2009-09-02 |
| KR20050030807A (en) | 2005-03-31 |
| KR100556892B1 (en) | 2006-03-03 |
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