CN101719777B - Method and device for determining phase difference - Google Patents

Method and device for determining phase difference Download PDF

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CN101719777B
CN101719777B CN 200910205973 CN200910205973A CN101719777B CN 101719777 B CN101719777 B CN 101719777B CN 200910205973 CN200910205973 CN 200910205973 CN 200910205973 A CN200910205973 A CN 200910205973A CN 101719777 B CN101719777 B CN 101719777B
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殷玮玮
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Abstract

The invention discloses a method for determining a phase difference. The method comprises the following steps: receiving data messages sent by a terminal, wherein the data messages comprise a first pilot sequence and a second pilot sequence with adjacent time sequences; determining a first phase difference between the first pilot sequence and the second pilot sequence; searching for one or more second phase differences having a difference of an integral multiple of 2*Pi with the first phase difference within the given ranged of the phase difference; and verifying one or more second phase differences to determine the successfully-verified phase difference. The invention further discloses a device for determining the phase difference. The invention can solve the problem that the phase difference is misjudged in the large frequency offset by the existing frequency-offset method.

Description

Phase difference is determined method and device
Technical field
The present invention relates to the communications field, especially relate to a kind of phase difference and determine that method and a kind of phase difference determine device.
Background technology
Along with the develop rapidly of the transmission meanss such as high-speed railway and highway, the train speed per hour of operation can be promoted to 200-250km thereon, and the F-Zero of magnetic suspension train can reach 430km.The high speed of traffic has proposed challenge to the covering of mobile communication High-speed Circumstance, and fast-developing high-speed railway has become the new focus of mobile voice and data service.The 3GPP agreement clearly proposes, and requires LTE (Long Term Evolution, Long Term Evolution) system can support the rate travel of maximum 500km/h.
When train moves at high-speed railway, because train moves the Doppler frequency deviation of generation and can the data that receive be exerted an influence, so that the phase place of the data that receive produces deflection, frequency deviation is larger, and phase place deflection is more serious, and is just more obvious on the impact of the coherent demodulation performance of system, and moving the Doppler frequency deviation of generation, train is directly proportional with the speed of a motor vehicle, in other words, the speed of a motor vehicle is higher, and Doppler frequency deviation is more serious on the impact of the coherent demodulation performance of system.
In order to reduce Doppler frequency deviation to the impact of the coherent demodulation performance of system, prior art has proposed a kind of solution, train and base station side are improved, train after the improvement can utilize AFC (Automatic Frequency Control, automatic frequency control) technology is carried out carrier frequency tracking, and the base station side after improving adopts fixedly the carrier frequency of frequency to carry out the signal reception.Although this method has reduced the train of line of high-speed railway to the sensitivity of Doppler frequency deviation, but, for base station side, but so that the Doppler frequency deviation of base station side reaches as high as the twice of actual frequency deviation, performance to the anti-frequency deviation of base station side is had higher requirement, and realizes that difficulty is high.
Simultaneously, in order to guarantee the coherent demodulation performance of system, prior art also proposes the data that receive are carried out again enforcement of judgment execute a judgement after the frequency correction, namely, receiving terminal need to carry out FOE (Frequency Offset Estimation, frequency deviation is estimated) and FOC (Frequency Offset Calibration, frequency offset correction) operation.But the Doppler frequency deviation of base station side is higher, and the phase difference misjudgment may occur.
For example, in an example, suppose that the reception signal of two adjacent pilot frequencies sequences of base station side is respectively
Figure GSB00000923975100021
So the phase place deflection Δ θ ' of two time slot adjacent pilot frequencies sequences=θ 2-θ 1When the train rate travel is very high, when perhaps noise effect was larger, Δ θ ' can exceed the scope of [π, π].Because the phase difference of observation is in [π, π], if phase difference exceeds this scope, the phase difference misjudgment will occur, for example when actual phase difference
Figure GSB00000923975100022
The time, can be judged as from receiving signal
Figure GSB00000923975100023
Summary of the invention
The embodiment of the invention provides a kind of phase difference to determine method, the wrongheaded problem of phase difference that exists when being used for solving the large frequency deviation of existing frequency deviation method, and the method comprises:
The data-message that receiving terminal sends wherein, comprises the first pilot frequency sequence and the second pilot frequency sequence that sequential is adjacent in the described data-message;
Determine the first-phase potential difference between described the first pilot frequency sequence and the second pilot frequency sequence;
In the phase range of setting, search the one or more second-phase potential differences that differ the integral multiple of 2 π with described first-phase potential difference;
Utilize described one or more second-phase potential difference respectively the data signal sequence that comprises in the described data-message to be compensated, determine the phase difference of verification succeeds according to phase difference corresponding to each data signal sequence after the compensation.
The embodiment of the invention also provides a kind of phase difference to determine device, the wrongheaded problem of phase difference that exists when being used for solving the large frequency deviation of existing frequency deviation method, and this device comprises:
Receiving element is used for the data-message that receiving terminal sends, and wherein, comprises the first pilot frequency sequence and the second pilot frequency sequence that sequential is adjacent in the described data-message;
The first determining unit is used for determining the first-phase potential difference between described the first pilot frequency sequence and the second pilot frequency sequence;
Search the unit, be used for searching the one or more second-phase potential differences that differ the integral multiple of 2 π with described first-phase potential difference at the phase range of setting;
The second determining unit is used for utilizing described one or more second-phase potential difference respectively the data signal sequence that described data-message comprises to be compensated, and determines the phase difference of verification succeeds according to phase difference corresponding to each data signal sequence after the compensation.
In embodiments of the present invention, the data-message that receiving terminal sends wherein, comprises the first pilot frequency sequence and the second pilot frequency sequence that sequential is adjacent in the described data-message; Determine the first-phase potential difference between described the first pilot frequency sequence and the second pilot frequency sequence; In the phase range of setting, search the one or more second-phase potential differences that differ the integral multiple of 2 π with described first-phase potential difference; Described one or more second-phase potential differences are carried out verification, determine the phase difference of verification succeeds.Can find out, in embodiments of the present invention, one or more possible phase differences be carried out verification, the correct phase difference of search in one or more possible phase differences can have been avoided the phase difference misjudgment that large frequency deviation causes in the existing frequency deviation method; And, in this example, do not need to do repeatedly frequency deviation and estimate, only need to add 2k π in fixed first-phase potential difference, and in the phase range of setting, select correct phase difference value, the wrongheaded problem of phase difference that exists in the time of just can solving large frequency deviation in the existing frequency deviation method.
Description of drawings
Fig. 1 is the particular flow sheet that phase difference that the embodiment of the invention provides is determined method;
Fig. 2 be the embodiment of the invention provide one or more second-phase potential differences are carried out verification, determine the first flow chart of the phase difference of verification succeeds;
Fig. 3 be the embodiment of the invention provide one or more second-phase potential differences are carried out verification, determine the second flow chart of the phase difference of verification succeeds;
Fig. 4 be the embodiment of the invention provide one or more second-phase potential differences are carried out verification, determine the third flow chart of the phase difference of verification succeeds;
Fig. 5 is the example flow chart that phase difference that the embodiment of the invention provides is determined method;
Fig. 6 is the structural representation that phase difference that the embodiment of the invention provides is determined device;
Fig. 7 is the first structural representation of the second determining unit of providing of the embodiment of the invention;
Fig. 8 is the second structural representation of the second determining unit of providing of the embodiment of the invention;
Fig. 9 is the third structural representation of the second determining unit of providing of the embodiment of the invention.
Embodiment
Reach as high as the twice of actual frequency deviation for the Doppler frequency deviation that solves the base station side of mentioning in the prior art, the phase difference misjudgment that large frequency deviation easily causes, performance to the anti-frequency deviation of base station side is had higher requirement, realize the high problem of difficulty, the embodiment of the invention provides a kind of phase difference to determine method, concrete handling process comprises as shown in Figure 1:
The data-message that step 101, receiving terminal send wherein, comprises the first pilot frequency sequence and the second pilot frequency sequence that sequential is adjacent in the data-message;
Step 102, determine the first-phase potential difference between the first pilot frequency sequence and the second pilot frequency sequence;
Step 103, in the phase range of setting, search the one or more second-phase potential differences that differ the integral multiple of 2 π with the first-phase potential difference;
Step 104, one or more second-phase potential differences are carried out verification, determine the phase difference of verification succeeds.
Flow process as shown in Figure 1, step 102 is determined the first phase difference θ between the first pilot frequency sequence and the second pilot frequency sequence when implementing, and common, the span of the first phase difference θ is Δ θ ∈ [π, π].Certainly, among the different embodiment, the span of the first phase difference θ also may be different, decide as the case may be.
Flow process as shown in Figure 1, step 103 are when implementing, and phase range can be definite according to parameter and the environment of current train and base station, and for example, phase range can be directly proportional with translational speed and the noise of train.Certainly, in the specific implementation, phase range can also be determined according to other parameters, specifically adopts which parameter to decide as the case may be.
Flow process as shown in Figure 1, step 104 is carried out verification to one or more second-phase potential differences when implementing, and the execution mode of determining the phase difference of verification succeeds can have multiple, now describes for example, and a kind of more excellent embodiment comprises as shown in Figure 2:
Step 201, utilize one or more second-phase potential differences respectively the data signal sequence that comprises in the data message to be compensated;
Step 202, the SNR (Signal Noise Ratio, signal to noise ratio) of each data signal sequence after the compensation relatively select second-phase potential difference corresponding to the data signal sequence of signal to noise ratio maximum wherein as the phase difference of verification succeeds.
During enforcement, another more excellent embodiment can also be arranged, as shown in Figure 3, comprise:
Step 301, utilize one or more second-phase potential differences respectively the data signal sequence that comprises in the data message to be compensated;
Step 302, each data signal sequence after the compensation is carried out CRC (Cyclic Redundancy Check, cyclic redundancy check (CRC)), select second-phase potential difference corresponding to data signal sequence that wherein CRC check is correct as the phase difference of verification succeeds.
Except above-mentioned two kinds of execution modes, the embodiment of other optimizations also may be arranged, as shown in Figure 4, comprising:
Step 401, utilize one or more second-phase potential differences respectively the data signal sequence that comprises in the data message to be compensated;
Step 402, the signal to noise ratio of each data signal sequence after the compensation are relatively selected the wherein second-phase potential difference corresponding to N data signal sequence of signal to noise ratio maximum, the integer value of N for presetting;
Step 403, N data signal sequence of signal to noise ratio maximum wherein carried out respectively CRC, select second-phase potential difference corresponding to data signal sequence that wherein CRC check is correct as the phase difference of verification succeeds.
Now describe with a specific embodiment:
The interior adjacent DMRS (Demodulation Reference Symbol, demodulation reference mark) of subframe is separated by 0.5 * 10 -3S, phase range is so: [Δ f * o.5 * 10 -3* 2 π, Δ f * 0.5 * 10 -3* 2 π].
If | Δ f|＞1000Hz, so | Δ θ | will surpass π, this moment, the Δ θ of judgement can produce mistake.
When the train translational speed reached the speed (being 97.2m/s) of 350km/h, the maximum frequency deviation that base station side receives was: v λ * 2 = v c / f c * 2 = 97.2 ( 3 * 10 8 ) / ( 2 * 10 9 ) * 2 = 1310 Hz , Wherein v is translational speed, and c is the light velocity, f cIt is carrier frequency, λ is carrier wavelength, so, phase range in the same subframe on the pilot tone (i.e. the first pilot frequency sequence and the second pilot frequency sequence) of adjacent time-slots is [1.31 π, 1.31 π], the frequency deviation algorithm that prior art proposes is unable to estimate out so large frequency deviation, also just can't determine accurately phase difference.
In this example, the phase difference that provides according to the embodiment of the invention determines that method processes, concrete handling process as shown in Figure 5:
Step 501, reception upward signal carry out channel estimating and detection, obtain
Figure GSB00000923975100061
Step 502, to establish up adjacent pilot frequencies sequence be P I, kAnd P 2, k, wherein k is the subcarrier sequence number, then the first phase difference θ (Δ θ ∈ [π, π]) is calculated as follows:
d = Σ k = 1 K ( P 1 , k ) * p 2 , k ; D is intermediate quantity, makes things convenient for the formula below the substitution;
Δ θ ′ = arctan ( Im ( d ) Re ( d ) ) , Δθ′∈[-π/2，π/2]；
If?Re(d)＞0，Δθ＝Δθ′；
Else
if?Im(d)＞0
Δθ＝π+Δθ′
Else
Δθ＝Δθ′-π
End
End；
Phase range [the θ that step 503, calculating may exist r, θ r], θ rScope is by maximum translational speed and the SNR decision of train, namely θ r = θ m + Δ θ n = 2 πt * v λ + Δ θ n ; θ wherein mBe the maximum skew of trying to achieve by translational speed, v is translational speed, and λ is carrier wavelength, Δ θ nBe the evaluated error relevant with noise, generally get Δ θ on the engineering n=0.2* θ m, t is sub-frame interval 0.5 * 10 -3S; For example, the maximal rate of train is 350km, so θ in the reality r=1.31 π+0.2*1.31 π=1.57 π;
Step 504, get [θ r, θ r] in, Δ θ ' value that all satisfy Δ θ '=Δ θ+2k π is designated as the second phase difference θ ' 1, Δ θ ' 2... Δ θ ' NumWherein k is integer, with Δ θ ' 1, Δ θ ' 2... Δ θ ' NumPhase difference as possible compensates data signal sequence respectively, obtains Num the data signal sequence after the compensation
Figure GSB00000923975100071
Wherein, Num is integer;
Step 505, the data signal sequence after Num compensation
Figure GSB00000923975100072
Select accurately the second phase difference θ '.
Step 505 has three kinds of concrete implementation methods when implementing:
Method one:
With the data after Num the compensation
Figure GSB00000923975100073
Decipher respectively and CRC check;
Select correct phase difference corresponding to branch of CRC check as a result of to export;
Method two:
To the data detection signal sequence after Num the compensation
Figure GSB00000923975100074
Firmly declare, obtain
Figure GSB00000923975100075
Wherein, obtain i the compensation after
Figure GSB00000923975100076
In Num SNR, select maximum SNR, and the phase difference that it is corresponding is exported as a result of;
Method three
Elder generation's using method two obtains Num SNR, and selects therein maximum M, and M is integer, then with this M corresponding frequency deviation data are compensated respectively, and decoding and CRC check, select correct phase difference corresponding to branch of CRC check as a result of to export.
During enforcement, for method one, method three has reduced a part of computation complexity, and for method two, the result of calculation of method three is more accurate.
Based on same inventive concept, the embodiment of the invention also provides a kind of phase difference to determine device, and concrete structure comprises as shown in Figure 6:
Receiving element 601 is used for the data-message that receiving terminal sends, and wherein, comprises the first pilot frequency sequence and the second pilot frequency sequence that sequential is adjacent in the data-message;
The first determining unit 602 is used for determining the first-phase potential difference between the first pilot frequency sequence and the second pilot frequency sequence;
Search unit 603, be used for searching the one or more second-phase potential differences that differ the integral multiple of 2 π with the first-phase potential difference at the phase range of setting;
The second determining unit 604 is used for one or more second-phase potential differences are carried out verification, determines the phase difference of verification succeeds.
In one embodiment, as shown in Figure 7, the second determining unit 603 can comprise:
The first compensation subelement 701 is used for utilizing one or more second-phase potential differences respectively the data signal sequence that data message comprises to be compensated;
The first chooser unit 702 is used for the signal to noise ratio of each data signal sequence after the relatively compensation, selects second-phase potential difference corresponding to the data signal sequence of signal to noise ratio maximum wherein as the phase difference of verification succeeds.
In one embodiment, as shown in Figure 8, the second determining unit 603 can comprise:
The second compensation subelement 801 is used for utilizing one or more second-phase potential differences respectively the data signal sequence that data message comprises to be compensated;
The second chooser unit 802 is used for each data signal sequence after the compensation is carried out cyclic redundancy check (CRC), selects second-phase potential difference corresponding to data signal sequence that wherein CRC check is correct as the phase difference of verification succeeds.
In one embodiment, as shown in Figure 9, the second determining unit 603 can comprise:
The 3rd compensation subelement 901 is used for utilizing one or more second-phase potential differences respectively the data signal sequence that data message comprises to be compensated;
The 3rd chooser unit 902, the signal to noise ratio of each data signal sequence after being used for relatively compensating is selected the wherein second-phase potential difference corresponding to N data signal sequence of signal to noise ratio maximum, and N is default integer value;
The 4th chooser unit 903 is used for N data signal sequence of signal to noise ratio maximum wherein carried out respectively cyclic redundancy check (CRC), selects second-phase potential difference corresponding to data signal sequence that wherein CRC check is correct as the phase difference of verification succeeds.
In one embodiment, such as Fig. 6, Fig. 7, Fig. 8 and shown in Figure 9, the second determining unit 603 can be further used for: set phase range, wherein, the phase range of setting is directly proportional with the translational speed of train and noise.
In embodiments of the present invention, the data-message that receiving terminal sends wherein, comprises the first pilot frequency sequence and the second pilot frequency sequence that sequential is adjacent in the described data-message; Determine the first-phase potential difference between described the first pilot frequency sequence and the second pilot frequency sequence; In the phase range of setting, search the one or more second-phase potential differences that differ the integral multiple of 2 π with described first-phase potential difference; Described one or more second-phase potential differences are carried out verification, determine the phase difference of verification succeeds.Can find out, in embodiments of the present invention, one or more possible phase differences be carried out verification, the correct phase difference of search in one or more possible phase differences can have been avoided the phase difference misjudgment that large frequency deviation causes in the existing frequency deviation method; And, in this example, do not need to do repeatedly frequency deviation and estimate, only need to add 2k π in fixed first-phase potential difference, and in the phase range of setting, select correct phase difference value, the wrongheaded problem of phase difference that exists in the time of just can solving large frequency deviation in the existing frequency deviation method.
Obviously, those skilled in the art can carry out various changes and distortion to the present invention and not break away from the spirit and scope of the present invention.Like this, if these modifications of the present invention and distortion belong within claim of the present invention and the equivalent technologies scope thereof, then the present invention also is intended to comprise these changes and is out of shape interior.

Claims (10)

1. a phase difference is determined method, it is characterized in that, comprising:
The data-message that receiving terminal sends wherein, comprises the first pilot frequency sequence and the second pilot frequency sequence that sequential is adjacent in the described data-message;
Determine the first-phase potential difference between described the first pilot frequency sequence and the second pilot frequency sequence;
In the phase range of setting, search the one or more second-phase potential differences that differ the integral multiple of 2 π with described first-phase potential difference;
Utilize described one or more second-phase potential difference respectively the data signal sequence that comprises in the described data-message to be compensated, determine the phase difference of verification succeeds according to phase difference corresponding to each data signal sequence after the compensation.
2. the method for claim 1 is characterized in that, determines the phase difference of verification succeeds according to phase difference corresponding to each data signal sequence after the compensation, comprising:
The signal to noise ratio of each data signal sequence after the compensation relatively selects second-phase potential difference corresponding to the data signal sequence of signal to noise ratio maximum wherein as the phase difference of verification succeeds.
3. the method for claim 1 is characterized in that, determines the phase difference of verification succeeds according to phase difference corresponding to each data signal sequence after the compensation, comprising:
Each data signal sequence after the compensation is carried out cyclic redundancy check (CRC), select second-phase potential difference corresponding to data signal sequence that wherein CRC check is correct as the phase difference of verification succeeds.
4. the method for claim 1 is characterized in that, determines the phase difference of verification succeeds according to phase difference corresponding to each data signal sequence after the compensation, comprising:
Relatively the signal to noise ratio of each data signal sequence after the compensation is selected the wherein second-phase potential difference corresponding to N data signal sequence of signal to noise ratio maximum, and described N is default integer value;
N data signal sequence to described wherein signal to noise ratio maximum carries out respectively cyclic redundancy check (CRC), selects second-phase potential difference corresponding to data signal sequence that wherein CRC check is correct as the phase difference of verification succeeds.
5. such as each described method of claim 1 to 4, it is characterized in that, the phase range of described setting is directly proportional with the translational speed of train and noise.
6. a phase difference is determined device, it is characterized in that, comprising:
Receiving element is used for the data-message that receiving terminal sends, and wherein, comprises the first pilot frequency sequence and the second pilot frequency sequence that sequential is adjacent in the described data-message;
The first determining unit is used for determining the first-phase potential difference between described the first pilot frequency sequence and the second pilot frequency sequence;
Search the unit, be used for searching the one or more second-phase potential differences that differ the integral multiple of 2 π with described first-phase potential difference at the phase range of setting;
The second determining unit is used for utilizing described one or more second-phase potential difference respectively the data signal sequence that described data-message comprises to be compensated, and determines the phase difference of verification succeeds according to phase difference corresponding to each data signal sequence after the compensation.
7. device as claimed in claim 6 is characterized in that, described the second determining unit also comprises:
The first chooser unit is used for the signal to noise ratio of each data signal sequence after the relatively compensation, selects second-phase potential difference corresponding to the data signal sequence of signal to noise ratio maximum wherein as the phase difference of verification succeeds.
8. device as claimed in claim 6 is characterized in that, described the second determining unit also comprises:
The second chooser unit is used for each data signal sequence after the compensation is carried out cyclic redundancy check (CRC), selects second-phase potential difference corresponding to data signal sequence that wherein CRC check is correct as the phase difference of verification succeeds.
9. device as claimed in claim 6 is characterized in that, described the second determining unit also comprises:
The 3rd chooser unit, the signal to noise ratio of each data signal sequence after being used for relatively compensating is selected the wherein second-phase potential difference corresponding to N data signal sequence of signal to noise ratio maximum, and described N is default integer value;
The 4th chooser unit is used for N data signal sequence of described wherein signal to noise ratio maximum carried out respectively cyclic redundancy check (CRC), selects second-phase potential difference corresponding to data signal sequence that wherein CRC check is correct as the phase difference of verification succeeds.
10. such as each described device of claim 6 to 9, it is characterized in that, described the second determining unit is further used for: set phase range, wherein, the phase range of described setting is directly proportional with the translational speed of train and noise.
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