CN105516042B - A kind of decision method and system of high-speed railways frequency deviation - Google Patents
A kind of decision method and system of high-speed railways frequency deviation Download PDFInfo
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- CN105516042B CN105516042B CN201410505087.8A CN201410505087A CN105516042B CN 105516042 B CN105516042 B CN 105516042B CN 201410505087 A CN201410505087 A CN 201410505087A CN 105516042 B CN105516042 B CN 105516042B
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Abstract
The present invention provides a kind of decision method of high-speed railways frequency deviation, this method includes：Base station obtains uplink signal and receives energy, determine that the uplink signal receives the maximum value of energy according to the uplink signal of each RRU users received；The change of the corresponding RRU of Energy maximum value is received according to the uplink signal, determines the positive and negative of Doppler frequency shift；According to the uplink signal that the RRU is received, the phase difference of orthogonal frequency division multiplex OFDM symbol is obtained, and the phase difference is corrected according to the positive and negative of the Doppler frequency shift；The phase of the OFDM symbol is compensated according to the phase difference after correction.The present invention provides a kind of high-speed railways frequency deviation decision system, which includes setting module, determining module, correction module and compensating module.Frequency offset estimation range of the present invention is larger, computation complexity is low, can solve the doppler shift problems under high-speed case.
Description
Technical field
The present invention relates to fields of communication technology, and in particular to a kind of decision method and system of high-speed railways frequency deviation.
Background technology
In a communications system, the high-speed motion of terminal can cause Doppler frequency shift, for example, if terminal is with the speed of 300km/h
Degree traveling, carrier frequency 2.6GHz, the then maximum doppler frequency generated is about 722Hz.In the uplink, the movement band of terminal
The Doppler frequency shift come at most can be twice of maximum Doppler frequency offset, that is to say, that terminal is travelled with the speed of 300km/h,
Under conditions of not considering down-going synchronous error, uplink frequency offset can at most reach 1444Hz.Under this Frequency Offset, if not
It takes some measures, upstream data is unable to properly receive.
In existing frequency excursion algorithm, some carries out utilizing PUSCH in offset estimation, such as LTE using pilot tone
The phase differences of two row pilot tones in one subframe carries out offset estimation, and the maximum frequency deviation that this method can be estimated is in 1071Hz
Left and right, has been more than this range if up frequency deviation, will lead to can not receiving for uplink signal.And in high-speed cases such as high ferros
Under, the speed of terminal is it is possible that 300km/h can be met or exceeded, if carrier frequency is 2.6GHz, it is contemplated that the mistake of down-going synchronous
Difference is 0.01ppm, and the frequency deviation of uplink is up to 1444+260=1704Hz, has been more than the maximum frequency deviation that can be estimated using pilot tone
Range, at this moment data will be unable to receive.
Therefore, in current uplink frequency offset algorithm for estimating, some frequency offset estimation ranges are limited, and what is had can not solve high ferro
Doppler shift problems under this high-speed case, the receptivity of signal are poor.
Invention content
In view of the drawbacks of the prior art, the present invention provides a kind of decision method and system of high-speed railways frequency deviation, passes through
The change of the effective RRU of user judges the positive and negative of Doppler frequency shift, and further judge and correct the phase difference of OFDM symbol so that
Frequency offset estimation range is larger, computation complexity is low, can solve the doppler shift problems under high-speed case.
In a first aspect, the present invention provides a kind of decision method of high-speed railways frequency deviation, the method includes：
The uplink signal for the user that base station is received according to each radio frequency remote unit RRU obtains each uplink signal and receives energy,
Determine that the uplink signal receives the maximum value of energy；
The change of the corresponding RRU of Energy maximum value is received according to the uplink signal, determines the positive and negative of Doppler frequency shift；
According to the uplink signal that the RRU is received, the phase difference of orthogonal frequency division multiplex OFDM symbol is obtained, and according to described
The positive and negative of Doppler frequency shift is corrected the phase difference；
The phase of the OFDM symbol is compensated according to the phase difference after correction.
Preferably, the change that the corresponding RRU of Energy maximum value is received according to the uplink signal determines Doppler's frequency
That moves is positive and negative, including：Judge whether the RRU changes, if so, the positive and negative of Doppler frequency shift changes.
Preferably, the uplink signal received according to the RRU obtains the phase of orthogonal frequency division multiplex OFDM symbol
Difference, and the phase difference is corrected according to the positive and negative of the Doppler frequency shift, including：
Pilot frequency information during Physical Uplink Shared Channel PUSCH data is sent according to user, OFDM symbol is calculated
Phase difference p；
Judge whether the positive and negative and phase difference p's of the Doppler frequency shift is positive and negative consistent, if inconsistent, to p value
It is adjusted：
Wherein, d=0 represents that the current Doppler frequency shift of user is negative, and d=1 represents that the current Doppler frequency shift of user is
Just.
Preferably, the change of the corresponding RRU of Energy maximum value is received according to the uplink signal, determines Doppler frequency shift
It is positive and negative, it further includes：
The uplink signal of the RRU receptions of energy maximum is received according to the uplink signal, uplink is calculated and shifts to an earlier date
Measure TA values；
If the TA values are less than or equal to 31, the initial Doppler frequency shift of the user is just, if the TA values are more than 31,
Then the initial Doppler frequency shift of the user is negative.
Preferably, the uplink signal includes：
Sounding Reference Signal SRS, Physical Uplink Shared Channel PUSCH and physical uplink control channel PUCCH.
Second aspect, the present invention provides a kind of decision system of high-speed railways frequency deviation, the system comprises：
Setting module for the uplink signal of the user received according to each radio frequency remote unit RRU, obtains uplink signal and connects
Energy is received, determines that the uplink signal receives the maximum value of energy；
Determining module for receiving the change of the corresponding RRU of Energy maximum value according to the uplink signal, determines Doppler
Frequency displacement it is positive and negative；
Correction module for the uplink signal received according to the RRU, obtains the phase of orthogonal frequency division multiplex OFDM symbol
Difference, and the phase difference is corrected according to the positive and negative of the Doppler frequency shift；
Compensating module, for being compensated according to the phase difference after correction to the phase of the OFDM symbol.
Preferably, the determining module, is specifically used for：
Judge whether effective RRU of user changes, if so, the positive and negative of the Doppler frequency shift changes.
Preferably, the correction module, is specifically used for：
Pilot frequency information during PUSCH data is sent according to user, the phase difference p of OFDM symbol is calculated；
Judge whether the positive and negative and phase difference p's of the Doppler frequency shift is positive and negative consistent, if inconsistent, to p value
It is adjusted：
Wherein, d=0 represents that the current Doppler frequency shift of user is negative, and d=1 represents that the current Doppler frequency shift of user is
Just.
Preferably, the system also includes：
Initial frequency deviation determination module, is used for：
The uplink signal of the RRU receptions of energy maximum is received according to the uplink signal, uplink is calculated and shifts to an earlier date
Measure TA values；
If the TA values are less than or equal to 31, the initial Doppler frequency displacement of the user is just, if the TA values are more than 31,
Then the initial Doppler frequency displacement of the user is negative.
Preferably, the uplink signal includes：
Sounding Reference Signal SRS, Physical Uplink Shared Channel PUSCH and physical uplink control channel PUCCH.
As shown from the above technical solution, the present invention provides a kind of decision method and system of high-speed railways frequency deviation, passes through
The change of the effective RRU of user judges the positive and negative of Doppler frequency shift, and further according to the positive negative judgement of Doppler frequency shift and corrects
The phase difference of OFDM symbol, method and system frequency offset estimation range provided by the invention is larger, computation complexity is low, can solve
Doppler shift problems under high-speed case.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these figures.
Fig. 1 is the structure diagram of high-speed railways；
Fig. 2 is the flow diagram of the decision method for the high-speed railways frequency deviation that one embodiment of the invention provides；
Fig. 3 is the flow diagram of the decision method for the high-speed railways frequency deviation that another embodiment of the present invention provides；
Fig. 4 is the structure diagram of the decision system for the high-speed railways frequency deviation that one embodiment of the invention provides.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
In high-speed railways, in order to improve MPS process, a baseband processing unit (Building is used sometimes
Base band Unit, abbreviation BBU) mode with multiple radio frequency remoto modules (Radio Remote Unit, abbreviation RRU),
RRU is set along railway frame side, there are two back-to-back RRU on an electric pole, as shown in Figure 1.
Assuming that train from RRU1, then in the range of RRU1 coverings, the terminal user on train is directed towards always
RRU1 is moved, and Doppler frequency shift is positive value；Behind overlay area from RRU1 to RRU2, the terminal user on train is the back of the body always
It is moved from RRU2, Doppler frequency shift is negative value；Similarly the region Doppler frequency shift of RRU3 is positive value, and the region of RRU4 is negative
Value.That is, as soon as terminal often passes through the transformation of time RRU, the symbol of Doppler frequency shift converts once.If it is known that just
Always the symbol of the RRU regions where end and Doppler frequency shift, then in high ferro operational process, by where judging terminal
RRU regions are it may determine that go out the Doppler frequency shift symbol of terminal.
BBU may determine that user is currently located at the coverage area of which RRU according to the RRU user informations received.User
After sending uplink information, RRU is received, and the RRU received signal energy near from user is big, the RRU received signal remote from user
Energy is small, so the size according to uplink signal energy, it is possible to judge the RRU positions that user is currently located, which is known as
Effective RRU of user.Wherein, uplink signal includes：Sounding Reference Signal (Sounding Reference Signal, letter
Claim SRS), Physical Uplink Shared Channel (Physical Uplink Shared CHannel, abbreviation PUSCH), physical uplink chain
Road control channel (Physical Uplink Control CHannel, abbreviation PUCCH) etc..
Uplink lead TA can be obtained according to the reception signal of effective RRU, when user moves towards RRU directions
When, user is more and more nearer with a distance from RRU, and the time that signal carrys out transmission back is reduced, it is desirable to reduce the transmission of uplink signal shifts to an earlier date
Amount, when user is far from RRU directions, user is more and more remote with a distance from RRU, and the time that signal carrys out transmission back increases, and needs to increase
Add the transmission lead of uplink signal, therefore according to the size of TA values, it is possible to judge that user is currently towards RRU movements also
It is to be moved far from RRU.When user is initially accessed, the symbol of Doppler frequency shift can be judged according to TA.
As shown in Fig. 2, Fig. 2 shows the flows of the decision method of high-speed railways frequency deviation that one embodiment of the invention provides
Figure, this method comprises the following steps：
201st, the uplink signal for the user that base station is received according to each radio frequency remote unit RRU obtains each uplink signal and receives
Energy determines that the uplink signal receives the maximum value of energy.
202nd, the change of the corresponding RRU of Energy maximum value is received according to the uplink signal, determines Doppler frequency shift just
It is negative.
Specifically, this step the specific implementation process is as follows：
The uplink signal of the RRU receptions of energy maximum is received according to the uplink signal, uplink is calculated and shifts to an earlier date
Measure TA values；
If the TA values are less than or equal to 31, the initial Doppler frequency shift of the user is just, if the TA values are more than 31,
Then the initial Doppler frequency shift of the user is negative.
After the initial Doppler frequency displacement that determined user, further include：Judge whether effective RRU of user changes, if
That then the positive and negative of the Doppler frequency shift changes, i.e. d=(d+1) mod2, wherein, d represents the current Doppler's frequency of user
Symbol is moved, d=0 represents that the current Doppler frequency shift of user is negative, and d=1 represents the current Doppler frequency shift of user for just.
203rd, the uplink signal received according to the RRU, the phase difference of acquisition orthogonal frequency division multiplex OFDM symbol, and according to
The positive and negative of the Doppler frequency shift is corrected the phase difference.
In the present embodiment, this step specifically includes：
Pilot frequency information during Physical Uplink Shared Channel PUSCH data is sent according to user, OFDM symbol is calculated
Phase difference p；
Judge whether the positive and negative and phase difference p's of the Doppler frequency shift is positive and negative consistent, if inconsistent, to p value
It is adjusted：
Wherein, d=0 represents that the current Doppler frequency shift of user is negative, and d=1 represents that the current Doppler frequency shift of user is
Just.
204th, the phase of the OFDM symbol is compensated according to the phase difference after correction.
As shown in figure 3, Fig. 3 shows sentencing for offset frequency in the high-speed railways that another more specific embodiment of the present invention provides
The certainly flow chart of method, this method comprises the following steps：
301st, it is the memory space of each 1 bit of user setting, is represented with d, d=0 represents the current Doppler's frequency of user
It is negative to move, and d=1 represents the current Doppler frequency shift of user for just.The memory space m of 1 bit is set to represent that user is current simultaneously
Effective RRU serial number, if selection RRU serial number odd numbers, m=1, if selection RRU serial number even numbers, m=0.
302nd, effective RRU of user is judged according to the energy of RRU reception uplink signals.
Wherein, RRU receives the uplink signal that user sends, and judges the energy for the user uplink signal that each RRU is received, energy
Maximum RRU is effective RRU of user.
303rd, according to the timing advance TA value of effective RRU channel estimation users received.
304th, judge that user is proximate to or far from base station, close then d=1, separate then d=0 according to TA values.
Specifically, it determines the initial information of d, TA values is calculated according to effective RRU uplink informations received, if TA
≤ 31, user moves towards RRU, and Doppler frequency shift is just d=1；If TA ＞ 31, user moves away from RRU, Doppler's frequency
It is negative to move, d=0.
305th, judge whether effective RRU of user changes, if so, going to step 306, otherwise go to step 307.
306th, so that d=(d+1) mod2.
With the high-speed motion of high ferro, effective RRU of user can change, such as original m=1, but calculate now
The serial number even number of the effective RRU arrived, i.e. m=0, then effective RRU change.If RRU changes, d=(d+1)
Mod2 that is, if d was 0 originally, becomes 1, if d was 1 originally, becomes 0.
307th, base station receives the PUSCH that user sends, and the phase difference p of OFDM symbol is calculated according to pilot signal.
308th, p value is corrected according to d values.
Specifically, p value is corrected according to the following formula：
309th, the phase of OFDM symbol is compensated according to the p value after correction.
The present embodiment provides a kind of decision methods of high-speed railways frequency deviation, are judged by the change of the effective RRU of user more
It is general to strangle the positive and negative of frequency displacement, and further according to the positive negative judgement of Doppler frequency shift and correct the phase difference of OFDM symbol, this implementation
Doppler's frequency that method and system frequency offset estimation range is larger, computation complexity is low, can solve under high-speed case that example provides
Shifting problem.
As shown in figure 4, Fig. 4 shows the decision system for the high-speed railways frequency deviation that one embodiment of the invention provides, this is
System includes：Setting module 401, determining module 402, correction module 403 and compensating module 404.
Wherein, setting module 401, for the uplink signal of the user received according to each radio frequency remote unit RRU, in acquisition
Row signal receives energy, determines that the uplink signal receives the maximum value of energy.
Determining module 402 for receiving the change of the corresponding RRU of Energy maximum value according to the uplink signal, determines more
It is general to strangle the positive and negative of frequency displacement.
Correction module 403 for the uplink signal received according to the RRU, obtains orthogonal frequency division multiplex OFDM symbol
Phase difference, and the phase difference is corrected according to the positive and negative of the Doppler frequency shift.
Compensating module 404, for being compensated according to the phase difference after correction to the phase of the OFDM symbol.
Whether determining module 402 changes specifically for the effective RRU for judging user, if so, Doppler frequency
The positive and negative of shifting changes,
Correction module 403, is specifically used for：Pilot frequency information during PUSCH data is sent according to user, OFDM symbols are calculated
Number phase difference p；Judge whether the positive and negative and phase difference p's of the Doppler frequency shift is positive and negative consistent, it is right if inconsistent
P value is adjusted：
Wherein, d=0 represents that the current Doppler frequency shift of user is negative, and d=1 represents that the current Doppler frequency shift of user is
Just.
The system further includes initial frequency deviation determination module, and for judging the initial frequency deviation symbol of user, concrete function is：
The uplink signal of the RRU receptions of energy maximum is received according to the uplink signal, uplink is calculated and shifts to an earlier date
Measure TA values；If the TA values are less than or equal to 31, the initial Doppler frequency shift of the user is just, if the TA values are more than 31,
Then the initial Doppler frequency shift of the user is negative.
The system is located in base station, for the frequency deviation in high-speed railways to be made decisions and compensated.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
The present invention is described in detail, it will be understood by those of ordinary skill in the art that；It still can be to aforementioned each implementation
Technical solution recorded in example modifies or carries out equivalent replacement to which part technical characteristic；And these modification or
It replaces, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (8)
1. a kind of decision method of high-speed railways frequency deviation, which is characterized in that the method includes：
The uplink signal for the user that base station is received according to each radio frequency remote unit RRU obtains each uplink signal and receives energy, determines
The uplink signal receives the maximum value of energy；
The change of the corresponding RRU of Energy maximum value is received according to the uplink signal, determines the positive and negative of Doppler frequency shift；
According to the uplink signal that the RRU is received, the phase difference of orthogonal frequency division multiplex OFDM symbol is obtained, and according to described how general
The positive and negative of frequency displacement is strangled to be corrected the phase difference；
The phase of the OFDM symbol is compensated according to the phase difference after correction；
The uplink signal received according to the RRU obtains the phase difference of orthogonal frequency division multiplex OFDM symbol, and according to described
The positive and negative of Doppler frequency shift is corrected the phase difference, including：
Pilot frequency information during Physical Uplink Shared Channel PUSCH data is sent according to user, the phase of OFDM symbol is calculated
Poor p；
Judge whether the positive and negative and phase difference p's of the Doppler frequency shift is positive and negative consistent, if inconsistent, p value is carried out
Adjustment：
Wherein, d=0 represents that the current Doppler frequency shift of user is negative, and d=1 represents the current Doppler frequency shift of user for just.
2. according to the method described in claim 1, it is characterized in that, described receive Energy maximum value pair according to the uplink signal
The change of the RRU answered determines the positive and negative of Doppler frequency shift, including：It is corresponding to judge that the uplink signal receives Energy maximum value
Whether RRU changes, if so, the positive and negative of the Doppler frequency shift changes.
3. according to the method described in claim 1, it is characterized in that, Energy maximum value is received according to the uplink signal described
The change of corresponding RRU determines the positive and negative of Doppler frequency shift, further includes：
The uplink signal of the RRU receptions of energy maximum is received according to the uplink signal, uplink lead TA is calculated
Value；
If the TA values are less than or equal to 31, the initial Doppler frequency shift of the user is just, if the TA values are more than 31, institute
It is negative, RRU regions when initial representation user is initially accessed to state the initial Doppler frequency shift of user.
4. according to the method described in claim 1, it is characterized in that, the uplink signal includes：
Sounding Reference Signal SRS, Physical Uplink Shared Channel PUSCH and physical uplink control channel PUCCH.
5. a kind of decision system of high-speed railways frequency deviation, which is characterized in that the system comprises：
Setting module for the uplink signal of the user received according to each radio frequency remote unit RRU, obtains uplink signal and receives energy
Amount determines that the uplink signal receives the maximum value of energy；
Determining module for receiving the change of the corresponding RRU of Energy maximum value according to the uplink signal, determines Doppler frequency shift
It is positive and negative；
Correction module for the uplink signal received according to the RRU, obtains the phase difference of orthogonal frequency division multiplex OFDM symbol,
And the phase difference is corrected according to the positive and negative of the Doppler frequency shift；
Compensating module, for being compensated according to the phase difference after correction to the phase of the OFDM symbol；
The correction module, is specifically used for：
Pilot frequency information during PUSCH data is sent according to user, the phase difference p of OFDM symbol is calculated；
Judge whether the positive and negative and phase difference p's of the Doppler frequency shift is positive and negative consistent, if inconsistent, p value is carried out
Adjustment：
Wherein, d=0 represents that the current Doppler frequency shift of user is negative, and d=1 represents the current Doppler frequency shift of user for just.
6. system according to claim 5, which is characterized in that the determining module is specifically used for：
Judge whether effective RRU of user changes, if so, the positive and negative of the Doppler frequency shift changes, it is described to have
It imitates RRU and receives the corresponding RRU of Energy maximum value for the uplink signal.
7. system according to claim 5, which is characterized in that the system also includes：
Initial frequency deviation determination module, is used for
The uplink signal of the RRU receptions of energy maximum is received according to the uplink signal, uplink lead TA is calculated
Value；
If the TA values are less than or equal to 31, the initial Doppler frequency shift of the user is just, if the TA values are more than 31, institute
It is negative, RRU regions when initial representation user is initially accessed to state the initial Doppler frequency shift of user.
8. system according to claim 5, which is characterized in that the uplink signal includes：
Sounding Reference Signal SRS, Physical Uplink Shared Channel PUSCH and physical uplink control channel PUCCH.
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| CN108282421B (en) * | 2017-01-05 | 2020-11-27 | 普天信息技术有限公司 | Method for estimating frequency offset of uplink control channel |
| CN112738765B (en) * | 2019-10-28 | 2023-03-28 | 中国电信股份有限公司 | Frequency compensation method for base station and system thereof |
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| CN101877687A (en) * | 2009-04-28 | 2010-11-03 | 鼎桥通信技术有限公司 | Method for transmitting downlink signal |
| CN101958744A (en) * | 2009-07-13 | 2011-01-26 | 大唐移动通信设备有限公司 | Method and device for pre-calibrating frequency deviation |
| CN102130873A (en) * | 2010-01-20 | 2011-07-20 | 中兴通讯股份有限公司 | Frequency offset estimation method and device |
| CN102546495A (en) * | 2012-01-29 | 2012-07-04 | 中兴通讯股份有限公司 | Method and device for frequency offset compensation |
| CN103188193A (en) * | 2011-12-29 | 2013-07-03 | 同济大学 | Doppler shift compensation method used for TD-LTE system |
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| CN101877687A (en) * | 2009-04-28 | 2010-11-03 | 鼎桥通信技术有限公司 | Method for transmitting downlink signal |
| CN101958744A (en) * | 2009-07-13 | 2011-01-26 | 大唐移动通信设备有限公司 | Method and device for pre-calibrating frequency deviation |
| CN102130873A (en) * | 2010-01-20 | 2011-07-20 | 中兴通讯股份有限公司 | Frequency offset estimation method and device |
| CN103188193A (en) * | 2011-12-29 | 2013-07-03 | 同济大学 | Doppler shift compensation method used for TD-LTE system |
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