CN102137048B - The method and system that a kind of frequency deviation is estimated - Google Patents
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Abstract
The invention discloses the method and system that a kind of frequency deviation is estimated, be applied to the capable system of Long Term Evolution, comprise: base station is carried out frequency deviation to a subframe in the upward signal received and estimated to obtain pre-estimation frequency deviation value; And calculate fixed phase difference according to multiple row demodulation reference mark in this subframe, the frequency deviation value of this subframe adjacent pilot frequencies is determined according to described pre-estimation frequency deviation value and described fixed phase difference.[-π is exceeded because terminal high-speed moves the frequency deviation phase place caused in order to overcome in existing LTE system, π] time, the shortcoming of base station erroneous judgement phase polarity, the present invention proposes one and utilizes Cyclic Prefix or single DMRS sequence rough estimate frequency deviation, recycling DMRS sequence accurately estimates the method for frequency deviation, avoid and be used alone Cyclic Prefix and single-row DMRS when estimating, the problem that the accuracy of estimation caused because intersymbol interference or sequence are too short is not high, solve again the wrongheaded problem of existing polarity, improve precision and the scope of frequency deviation estimation.
Description
Technical field
Relate to wireless communication system herein, particularly relate to the frequency deviation estimating method in Long Term Evolution (LongTermEvolution is called for short LTE) system.
Background technology
Along with the develop rapidly of traffic technique, train speed per hour is promoted to 200 ~ 250 kilometer per hours, and magnetic suspension train F-Zero can reach 430 kilometer per hours.The soverlay technique that the high speed of traffic system turns to mobile communication High-speed Circumstance proposes challenge.Therefore, the soverlay technique of high-speed railway has become the new focus of mobile voice and data service.Third generation partner program (3rdGenerationPartnershipProject is called for short 3GPP) agreement explicitly calls for LTE system can support the rate travel of the highest 500 kilometer per hours of mobile terminal.
During high-speed railway runs, mobile terminal can be made to produce phase place to the reception of data by the mobile Doppler frequency shift produced to deflect, and frequency deviation is larger, phase place deflection is more serious, more obvious on the impact of the coherent demodulation performance of system, namely more the impact of high doppler shift on demodulation performance is more serious for the speed of a motor vehicle.
In order to reduce the impact of frequency shift (FS) on signal receiving performance, terminal adopts automatic frequency to control (AutomaticFrequencyControl usually, being called for short AFC) technology carries out carrier frequency tracking, and base station side adopts the carrier frequency of fixing frequency to carry out Signal reception.Although this method decreases the susceptibility of terminal to frequency deviation of line of high-speed railway, make base station side Doppler shift reach as high as the twice of actual frequency deviation, the performance of the anti-frequency deviation in base station is had higher requirement.
In order to ensure the demodulation performance of data, need during demodulation to carry out enforcement of judgment execute a judgement again after frequency correction to reception data, namely signal receiving end needs the signal to receiving to carry out frequency deviation estimation (FrequencyOffsetEstimation, be called for short FOE) and the operation of frequency offset correction (FrequencyOffsetCalibration, abbreviation FOC).
Suppose that the Received signal strength of two adjacent pilot frequencies in base station is respectively
therefore the phase place of two time slot adjacent pilot frequencies is deflected to Δ θ '=θ
2-θ
1.When fast mobile terminal speed is very high, or when noise effect is larger, Δ θ ' can exceed the scope of [-π, π].Phase difference due to base station sight is in [-π, π], and polarity misjudgment can occur the phase difference exceeding this scope.Adjacent demodulation reference mark (DemodulationReferenceSymbol is called for short DMRS) for example in LTE system in a subframe is separated by 0.5 × 10
-3s, so adjacent DMRS phase range is: [-Δ f × 0.5 × 10
-3× 2 π, Δ f × 0.5 × 10
-3× 2 π].When train translational speed reaches the speed of 350km/h (i.e. 97.2m/s), the maximum frequency deviation Δ f that base station receives is:
Wherein v is translational speed, and c is the light velocity, f
cbe carrier frequency, λ is carrier wavelength.So during noiseless, in same subframe, the phase range of the demodulation reference mark of adjacent time-slots is [-1.31 π, 1.31 π], and when having noise, phase range can be larger.As shown in Figure 1, when actual phase difference is-1.31 π, cannot distinguish phase difference from Received signal strength is-1.31 π or 0.69 π, the general scope according to [-π, π] and be judged as 0.69 π, therefore causes phase difference misjudgment.
Summary of the invention
The technical problem to be solved in the present invention is to provide the method and system that a kind of frequency deviation is estimated, improves precision and the scope of frequency deviation estimation.
In order to solve the problem, the invention provides a kind of method that frequency deviation is estimated, being applied to the capable system of Long Term Evolution, it is characterized in that, base station is carried out frequency deviation to a subframe in the upward signal received and is estimated to obtain pre-estimation frequency deviation value; And calculate fixed phase difference according to multiple row demodulation reference mark in this subframe, the frequency deviation value of this subframe adjacent pilot frequencies is determined according to described pre-estimation frequency deviation value and described fixed phase difference.
Further, said method can also have following characteristics:
The method of a subframe in upward signal being carried out to frequency deviation estimation is: estimate to obtain frequency deviation Δ f according to the demodulation reference mark of a time slot in subframe
rSas described pre-estimation frequency deviation value Δ f
r.The single DMRS sequence received is utilized to obtain channel estimation in frequency domain
again will
transform to time domain to obtain
calculate
phase deviation in sequence is also converted into frequency deviation value;
Suppose that the DMRS signal receiving a jth time slot is P
j,k, reference signal is r
j,k, k is the index of subcarrier, and the channel estimating obtaining a jth time slot DMRS is h
j,k;
S
j,k＝P
j,k×(h
j,k×r
j,k)
*j＝1,2,k＝1,2,...,K；
By sequence S-transformation to time domain, obtain sequence
To sequence
front portion (g
1, g
2... g
k/2) and rear portion (g
k/2+1, g
k/2+2... g
k) sue for peace respectively:
Obtain C respectively
1and C
2phase place:
Calculate frequency deviation
t
sit is an OFDM symbol cycle.
Further, said method can also have following characteristics:
Estimate to obtain frequency deviation Δ f according to the Cyclic Prefix of single-carrier frequency division multiple access symbol in described subframe
cpas described pre-estimation frequency deviation value Δ f
r;
Concrete, take out the Cyclic Prefix in single-carrier frequency division multiple access SC-FDMA symbol in subframe, suppose total N number of symbol in a subframe, the sample value sequence of the Cyclic Prefix of the n-th symbol is
last L sample value of the n-th symbol is
carry out conjugate multiplication sum operation according to following formula and obtain e
n, calculate e
nphase delta θ
n, then be converted into frequency deviation value Δ f
r;
wherein L is the length of Cyclic Prefix;
Corresponding frequency deviation is estimated as:
wherein t
symit is the time domain length of a SC-FDMA symbol.
Further, said method can also have following characteristics:
Calculate the pre-estimation phase difference value that pre-estimation frequency deviation value is corresponding, from described fixed phase difference be separated by 2 π integral multiples each phase value find one with the immediate phase value of described pre-estimation phase difference value, as the phase difference value of this subframe adjacent pilot frequencies, and obtain corresponding frequency deviation value.
Further, said method can also have following characteristics:
The method obtaining described fixed phase difference comprises: carry out conjugate multiplication to the adjacent two row demodulation reference mark sequences in described subframe and obtain a plural number after summation, the phase place calculating this plural number is the fixed phase difference between adjacent pilot frequencies.
Further, said method can also have following characteristics:
The method obtaining pre-estimation frequency deviation value is the one in following methods: method one, estimates to obtain frequency deviation Δ f according to the demodulation reference mark of a time slot in described subframe
rSas described pre-estimation frequency deviation value; Method two, estimates to obtain frequency deviation Δ f according to the Cyclic Prefix of single-carrier frequency division multiple access symbol in described subframe
cpas described pre-estimation frequency deviation value.
Further, said method can also have following characteristics:
The method obtaining pre-estimation frequency deviation value is: obtain frequency deviation Δ f according to said method one
cp, obtain frequency deviation Δ f according to said method two
cp, by described frequency deviation Δ f
cpwith frequency deviation Δ f
rSweighted value as described pre-estimation frequency deviation value.
In order to solve the problem, present invention also offers the system that a kind of frequency deviation is estimated, comprise base station, this base station comprises frequency deviation estimating modules; Described frequency deviation estimating modules comprises frequency deviation pre-estimation unit, fixed phase difference estimation unit, the frequency deviation determining unit be all connected with described fixed phase difference estimation unit with described frequency deviation pre-estimation unit; Described frequency deviation pre-estimation unit, estimates to obtain pre-estimation frequency deviation value for carrying out frequency deviation to a subframe in the upward signal received; Fixed phase difference estimation unit, for calculating fixed phase difference according to multiple row demodulation reference mark in described subframe; Described frequency deviation determining unit, for determining the frequency deviation value of described subframe adjacent pilot frequencies according to described pre-estimation frequency deviation value and described fixed phase difference.
Further, said system can also have following characteristics:
Described frequency deviation determining unit, also for calculating pre-estimation phase difference value corresponding to described pre-estimation frequency deviation value, from described fixed phase difference be separated by 2 π integral multiples each phase value find one with the immediate phase value of described pre-estimation phase difference value, as the phase difference value of this subframe adjacent pilot frequencies, and obtain corresponding frequency deviation value.
Further, said system can also have following characteristics:
Fixed phase difference estimation unit, also for calculating described fixed phase difference according to following method: carry out conjugate multiplication to the adjacent two row demodulation reference mark sequences in described subframe and obtain a plural number after summation, the phase place calculating this plural number is the fixed phase difference between adjacent pilot frequencies.
Further, said system can also have following characteristics:
Described frequency deviation pre-estimation unit, also for obtaining pre-estimation frequency deviation value according to the one in following methods: method one, estimates to obtain frequency deviation Δ f according to the Cyclic Prefix of single-carrier frequency division multiple access symbol in described subframe
cpas described pre-estimation frequency deviation value; Method two, estimates to obtain frequency deviation Δ f according to the demodulation reference mark of a time slot in described subframe
rSas described pre-estimation frequency deviation value.
Further, said system can also have following characteristics:
Described frequency deviation pre-estimation unit, also for obtaining pre-estimation frequency deviation value according to following methods: obtain frequency deviation Δ f according to said method one
cp, obtain frequency deviation Δ f according to said method two
cp, by described frequency deviation Δ f
cpwith frequency deviation Δ f
rSweighted value as described pre-estimation frequency deviation value.
In order to overcome in existing LTE system due to terminal high-speed move the frequency deviation phase place caused exceed [-π, π] time, base station erroneous judgement phase polarity shortcoming.The present invention proposes one and utilizes Cyclic Prefix or single DMRS sequence rough estimate frequency deviation, recycling DMRS sequence accurately estimates the method for frequency deviation, avoid and be used alone Cyclic Prefix and single-row DMRS when estimating, the problem that the accuracy of estimation caused because intersymbol interference or sequence are too short is not high, solve again the wrongheaded problem of existing polarity, improve precision and the scope of frequency deviation estimation.
Accompanying drawing explanation
Fig. 1 is the phase difference schematic diagram in prior art in phase difference estimation example.
Fig. 2 is the structure chart of the system frequency deviation estimation module that embodiment frequency deviation is estimated;
Fig. 3 is the method flow diagram that embodiment frequency deviation is estimated.
Embodiment
The system that frequency deviation is estimated comprises base station, this base station comprises frequency deviation estimating modules, as shown in Figure 2, frequency deviation estimating modules comprises frequency deviation pre-estimation unit, fixed phase difference estimation unit, the frequency deviation determining unit be all connected with fixed phase difference estimation unit with frequency deviation pre-estimation unit;
Described frequency deviation pre-estimation unit, estimates to obtain pre-estimation frequency deviation value for carrying out frequency deviation to a subframe in the upward signal received; Also for obtaining pre-estimation frequency deviation value according to the one in following methods:
Method one, estimates to obtain frequency deviation Δ f according to the Cyclic Prefix of single-carrier frequency division multiple access symbol in described subframe
cpas described pre-estimation frequency deviation value;
Method two, estimates to obtain frequency deviation Δ f according to the demodulation reference mark of a time slot in described subframe
rSas described pre-estimation frequency deviation value;
Method three, obtains frequency deviation Δ f according to said method one
cp, obtain frequency deviation Δ f according to said method two
cp, by described frequency deviation Δ f
cpwith frequency deviation Δ f
rSweighted value as described pre-estimation frequency deviation value.
Fixed phase difference estimation unit, for calculating fixed phase difference DELTA θ ' according to multiple row demodulation reference mark in described subframe
rS; Concrete calculates described fixed phase difference according to following method: carry out conjugate multiplication to the adjacent two row demodulation reference mark sequences in described subframe and obtain a plural number after summation, and the phase place calculating this plural number is the fixed phase difference between adjacent pilot frequencies.
Described frequency deviation determining unit, for according to described pre-estimation frequency deviation value and described fixed phase difference DELTA θ '
rSdetermine the frequency deviation value of described subframe adjacent pilot frequencies.Concrete, calculate the pre-estimation phase difference value that described pre-estimation frequency deviation value is corresponding, from described fixed phase difference be separated by 2 π integral multiples each phase value find one with the immediate phase value of described pre-estimation phase difference value, as the phase difference value of this subframe adjacent pilot frequencies, and obtain corresponding frequency deviation value.
As shown in Figure 3, frequency deviation estimating method comprises:
Step 301, carries out frequency deviation to a subframe in the upward signal received and estimates to obtain pre-estimation frequency deviation value Δ f
r; The one in following methods can be adopted:
Method one, estimates to obtain frequency deviation Δ f according to the Cyclic Prefix of single-carrier frequency division multiple access symbol in described subframe
cpas described pre-estimation frequency deviation value Δ f
r.
Concrete, take out the Cyclic Prefix in single-carrier frequency division multiple access (SC-FDMA) symbol in subframe, suppose total N number of symbol in a subframe, the sample value sequence of the Cyclic Prefix of the n-th symbol is
last L sample value of the n-th symbol is
carry out conjugate multiplication sum operation according to following formula and obtain e
n, calculate e
nphase delta θ
n, then be converted into frequency deviation value Δ f
r.
wherein L is the length of Cyclic Prefix.
Corresponding frequency deviation is estimated as:
wherein t
symit is the time domain length of a SC-FDMA symbol.
Method two, estimates to obtain frequency deviation Δ f according to the demodulation reference mark of a time slot in subframe
rSas described pre-estimation frequency deviation value Δ f
r.The single DMRS sequence received is utilized to obtain channel estimation in frequency domain
again will
transform to time domain to obtain
calculate
phase deviation in sequence is also converted into frequency deviation value.
Concrete, suppose that the DMRS signal receiving a jth time slot is P
j,k, reference signal is r
j,k, k is the index of subcarrier, and the channel estimating obtaining a jth time slot DMRS is h
j,k.
S
j,k＝P
j,k×(h
j,k×r
j,k)
*j＝1,2,k＝1,2,...,K；
By sequence S-transformation to time domain, obtain sequence
To sequence
front portion (g
1, g
2... g
k/2) and rear portion (g
k/2+1, g
k/2+2... g
k) sue for peace respectively:
Obtain C respectively
1and C
2phase place:
Calculate frequency deviation
t
sbe OFDM symbol cycle, i.e. a T
s=2048/ (30.72 × 10
6).
Method three:
Frequency deviation Δ f is obtained according to said method one
cp, obtain frequency deviation Δ f according to said method two
cp, by described frequency deviation Δ f
cpwith frequency deviation Δ f
rSweighted value as described pre-estimation frequency deviation value Δ f
r.
Such as frequency deviation value is Δ f
r=(1-α) Δ f
cp+ α Δ f
rS, wherein α is weighted factor, α be greater than 0 and be less than 1 real number.
Step 302; Calculate pre-estimation frequency deviation value Δ f
rcorresponding pre-estimation phase difference value Δ θ
r=2* π * Δ f
r* t; Wherein t is the interval of adjacent two row DMRS sequences in subframe, and the t of being separated by of the adjacent DMRS sequence in LTE system in a subframe is 0.5 × 10
-3s.
Step 303, calculates fixed phase difference DELTA θ ' according to multiple row demodulation reference mark in this subframe
rS.
Concrete, carry out conjugate multiplication to the adjacent two row demodulation reference mark sequences in this subframe and obtain a plural s after summation, the phase delta θ (Δ θ ∈ [-π, π]) calculating this plural number is the fixed phase difference between adjacent pilot frequencies.
Concrete, if up adjacent DMRS sequence is P
1, kand P
2, k, wherein k is subcarrier sequence number, first by P
1, kand P
2, kconjugate multiplication is also sued for peace, and obtains
wherein K is sub-carrier number, then calculates the phase difference θ of s.For example in LTE, when train speed reaches 350km/h, and to during away from base station direction running, Δ θ=0.69 π herein calculated.
Step 304, determines the frequency deviation value of this subframe adjacent pilot frequencies according to described pre-estimation frequency deviation value and described fixed phase difference.
Concrete, from described fixed phase difference be separated by 2 π integral multiples each phase value find one with the immediate phase value of described pre-estimation phase difference value, as the phase difference value of this subframe adjacent pilot frequencies, and obtain corresponding frequency deviation value.Make Δ θ '
k=Δ θ+2k π=0.69 π+2k π, wherein k is integer.At Δ θ '
kin find and Δ θ
rdiffer minimum phase value, be designated as Δ θ ', in this example Δ θ '=-1.31 π.
Obtain the frequency deviation value Δ f=Δ θ '/2* π * t of this subframe adjacent pilot frequencies corresponding according to the phase difference value of this subframe adjacent pilot frequencies, wherein t is the interval of adjacent two row DMRS sequences, and the adjacent DMRS sequence in LTE system in a subframe is separated by 0.5 × 10
-3s.
Compared with existing frequency deviation estimating method, this method has fully utilized Cyclic Prefix and DMRS sequence carries out frequency deviation estimation, the frequency offset estimation result of Cyclic Prefix is used for judging rough scope, the frequency deviation multiple DMRS sequence done is estimated to be used for the thin estimation in rough range, two steps are divided to estimate frequency deviation, final precision and the scope improving frequency deviation estimation.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a method for frequency deviation estimation, is applied to long evolving system, it is characterized in that,
Base station is carried out frequency deviation to a subframe in the upward signal received and is estimated to obtain pre-estimation frequency deviation value; And calculate fixed phase difference according to multiple row demodulation reference mark in this subframe, the frequency deviation value of this subframe adjacent pilot frequencies is determined according to described pre-estimation frequency deviation value and described fixed phase difference.
2. the method for claim 1, is characterized in that, the method for a subframe in upward signal being carried out to frequency deviation estimation is: estimate to obtain frequency deviation △ f according to the demodulation reference mark of a time slot in subframe
rSas described pre-estimation frequency deviation value △ f
r, utilize the single demodulation reference mark DMRS sequence received to obtain channel estimation in frequency domain
again will
transform to time domain to obtain
calculate
phase deviation in sequence is also converted into frequency deviation value;
Suppose that the DMRS signal receiving a jth time slot is P
j,k, reference signal is r
j,k, k is the index of subcarrier, and K is the total number of subcarrier that demodulation reference mark takies, and the channel estimating obtaining a jth time slot DMRS is h
j,k;
S
j,k=P
j,k× (h
j,k× r
j,k)
*, wherein j=1,2; K=1,2 ..., K;
By sequence S-transformation to time domain, obtain sequence
To sequence
front portion (g
1, g
2... g
k/2) and rear portion (g
k/2+1, g
k/2+2... g
k) sue for peace respectively:
Obtain C respectively
1and C
2phase place:
Calculate frequency deviation
t
sit is an OFDM symbol cycle.
3. the method for claim 1, is characterized in that,
Estimate to obtain frequency deviation △ f according to the Cyclic Prefix of single-carrier frequency division multiple access symbol in described subframe
cpas described pre-estimation frequency deviation value △ f
r;
Concrete, take out the Cyclic Prefix in single-carrier frequency division multiple access SC-FDMA symbol in subframe, suppose total N number of symbol in a subframe, the sample value sequence of the Cyclic Prefix of the n-th symbol is
last L sample value of the n-th symbol is
carry out conjugate multiplication sum operation according to following formula and obtain e
n, calculate e
nphase place △ θ
n, then be converted into frequency deviation value △ f
r;
wherein L is the length of Cyclic Prefix;
Corresponding frequency deviation is estimated as:
wherein t
symit is the time domain length of a SC-FDMA symbol.
4. the method for claim 1, is characterized in that,
Calculate the pre-estimation phase difference value that pre-estimation frequency deviation value is corresponding, from described fixed phase difference be separated by 2 π integral multiples each phase value find one with the immediate phase value of described pre-estimation phase difference value, as the phase difference value of this subframe adjacent pilot frequencies, and obtain corresponding frequency deviation value.
5. the method for claim 1, is characterized in that,
The method obtaining described fixed phase difference comprises:
Carry out conjugate multiplication to the adjacent two row demodulation reference mark sequences in described subframe and obtain a plural number after summation, the phase place calculating this plural number is the fixed phase difference between adjacent pilot frequencies.
6. the method as described in claim 1,2 or 3, is characterized in that,
The method obtaining pre-estimation frequency deviation value is the one in following methods:
Method one, estimates to obtain frequency deviation △ f according to the demodulation reference mark of a time slot in described subframe
rSas described pre-estimation frequency deviation value;
Method two, estimates to obtain frequency deviation △ f according to the Cyclic Prefix of single-carrier frequency division multiple access symbol in described subframe
cpas described pre-estimation frequency deviation value.
7. a system for frequency deviation estimation, comprise base station, this base station comprises frequency deviation estimating modules, it is characterized in that,
Described frequency deviation estimating modules comprises frequency deviation pre-estimation unit, fixed phase difference estimation unit, the frequency deviation determining unit be all connected with described fixed phase difference estimation unit with described frequency deviation pre-estimation unit;
Described frequency deviation pre-estimation unit, estimates to obtain pre-estimation frequency deviation value for carrying out frequency deviation to a subframe in the upward signal received;
Fixed phase difference estimation unit, for calculating fixed phase difference according to multiple row demodulation reference mark in described subframe;
Described frequency deviation determining unit, for determining the frequency deviation value of described subframe adjacent pilot frequencies according to described pre-estimation frequency deviation value and described fixed phase difference.
8. system as claimed in claim 7, is characterized in that,
Described frequency deviation determining unit, also for calculating pre-estimation phase difference value corresponding to described pre-estimation frequency deviation value, from described fixed phase difference be separated by 2 π integral multiples each phase value find one with the immediate phase value of described pre-estimation phase difference value, as the phase difference value of this subframe adjacent pilot frequencies, and obtain corresponding frequency deviation value.
9. system as claimed in claim 7, is characterized in that,
Fixed phase difference estimation unit, also for calculating described fixed phase difference according to following method: carry out conjugate multiplication to the adjacent two row demodulation reference mark sequences in described subframe and obtain a plural number after summation, the phase place calculating this plural number is the fixed phase difference between adjacent pilot frequencies.
10. system as claimed in claim 7 or 8, is characterized in that,
Described frequency deviation pre-estimation unit, also for obtaining pre-estimation frequency deviation value according to the one in following methods:
Method one, estimates to obtain frequency deviation △ f according to the Cyclic Prefix of single-carrier frequency division multiple access symbol in described subframe
cpas described pre-estimation frequency deviation value;
Method two, estimates to obtain frequency deviation △ f according to the demodulation reference mark of a time slot in described subframe
rSas described pre-estimation frequency deviation value.
11. systems as claimed in claim 10, is characterized in that,
Described frequency deviation pre-estimation unit, also for obtaining pre-estimation frequency deviation value according to following methods: obtain frequency deviation △ f according to said method one
cp, obtain frequency deviation △ f according to said method two
rS, by described frequency deviation △ f
rSwith frequency deviation △ f
cpweighted value as described pre-estimation frequency deviation value.
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| CN102946373B (en) * | 2012-09-25 | 2016-12-21 | 天津理工大学 | A kind of frequency deviation estimating method based on the reconstruct of PN sequence |
| CN104243380A (en) * | 2013-06-09 | 2014-12-24 | 普天信息技术研究院有限公司 | Method for uplink frequency synchronization |
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| CN101547062A (en) * | 2009-03-03 | 2009-09-30 | 华为技术有限公司 | Method and device for correcting frequency deviation |
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