CN105099963A - Frequency offset estimation device and method - Google Patents
Frequency offset estimation device and method Download PDFInfo
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Abstract
The invention provides a frequency offset estimation device and method. The method provided by the invention comprises the steps that according to the frequency offset value of a current frame of shared channel data acquired through a set algorithm, parallel frequency offset interval searching is carried out on the frequency offset value and values between two mirror intervals, so as to acquire a correct frequency offset interval and frequency offset value; and according to the correct frequency offset interval and frequency offset value, shared channel and/or control channel data and/or detection signal demodulation is carried out. The search delay of the frequency offset interval can be effectively reduced. The accuracy of frequency offset estimation is improved.
Description
Technical field
The present invention relates to wireless communication system, particularly relate to the apparatus and method that a kind of frequency deviation is estimated.
Background technology
Under high ferro scene, because train high-speed mobile can produce larger Doppler shift, when terminal regulates crystal oscillator frequency with counteracting downstream frequency deviation, upward signal can be made to produce larger frequency deviation, and this frequency deviation and carrier frequency, moving velocity of terminal are relevant.
Suppose that center carrier frequence is 2.6GHz, when terminal moves with the speed of 450km/h, frequency deviation can reach 2.167KHz, adds the deviation etc. of crystal oscillator, and frequency deviation can reach 2.427KHz with phase time is maximum.The impact of frequency deviation is presented as the phase error accumulation effect between time domain samples, specific to Long Term Evolution (LongTermEvolution, LTE) upward signal, can cause the phase rotating between single-carrier symbol and the inter-sub-carrier interference in symbol, wherein between single-carrier symbol, phase rotating impact is larger.Do not correct for the frequency deviation under high ferro scene, then signal cannot carry out demodulation.
Because the phase difference between demodulated reference signal (DemodulationReferenceSignal, DMRS) sequence carries out frequency offset calculation, maximum estimation frequency deviation region is 2KHz (-1KHz, 1KHz).Under high ferro scene, due to the high-speed cruising of train, the actual frequency deviation of generation may be the scope that DMRS can measure, also likely between its MIRROR SITE [-3KHz ,-1KHz) and [1KHz, 3KHz).So, first must identify that in the process doing frequency deviation estimation frequency deviation is interval, correct frequency deviation value could be confirmed further.
In frequency deviation search procedure, existing frequency deviation estimating modules is according to each Transmission Time Interval (TransmissionTimeInterval, TTI) frequency deviation value that output one is possible is to Physical Uplink Shared Channel (PhysicalUplinkSharedChannel, PUSCH) rectify a deviation, according to the result of PUSCH demodulation coding, search in 3 possible frequency deviation values.After searching correct frequency deviation value, follow the tracks of the change of this correct frequency deviation value.Owing to there being 3 frequency deviation intervals, need each interval to measure one by one, the consumption of computing duration is large.
In sum, need the time delay reducing the search of frequency deviation interval further, improve the accuracy rate that frequency deviation is estimated.
Summary of the invention
The apparatus and method that the embodiment of the present invention provides a kind of frequency deviation to estimate, to reduce the time delay of frequency deviation interval search, improve the accuracy rate that frequency deviation is estimated.
First aspect, provides the device that a kind of frequency deviation is estimated, comprising:
First acquiring unit, for obtaining the first frequency deviation value of the present frame of shared channel data according to set algorithm, it is interval that described first frequency deviation value is positioned at the first frequency deviation, and described first frequency deviation interval has between two MIRROR SITEs;
Search unit, for according to described first frequency deviation value and two mirror image interval values corresponding to described first frequency deviation value, carries out the search of parallel frequency deviation interval;
Second acquisition unit, for the result according to described parallel frequency deviation search, obtains correct frequency deviation interval and frequency deviation value, carries out the demodulation of described shared channel and/or control channel data and/or detectable signal with and frequency deviation value interval according to described correct frequency deviation.
In the implementation that the first is possible, described search unit comprises:
First operating unit, for respectively in described first frequency deviation interval and described two MIRROR SITEs, described first frequency deviation value and described two mirror image interval values are carried out the first operation simultaneously, and described first operation comprises: correction, pilot tone and/or data channel are estimated, separate mediation decoding;
3rd acquiring unit, for firmly sentencing result according to the result of described decoding or the Soft Inform ation of chnnel coding or described Soft Inform ation, obtains the result of described parallel frequency deviation interval search.
In conjunction with the first possible implementation of first aspect or first aspect, in the implementation that the second is possible, described device also comprises:
4th acquiring unit, for when carrying out frequency deviation to the present frame of shared channel data and estimating, walking abreast according to the last time, frequency deviation is interval searches for the frequency deviation interval obtained, and obtains second frequency deviation value of described present frame in described frequency deviation interval;
Second operating unit, for carrying out the second operation according to described second frequency deviation value obtained to described present frame, described second operation comprises: data channel is estimated, separate mediation decoding.
In conjunction with the implementation that the second of first aspect is possible, in the implementation that the third is possible, described search unit also for:
The error frame number that the frequency deviation of carrying out present frame when the frequency deviation interval adopting last parallel frequency deviation interval search to obtain is estimated exceedes setting frame number, or last parallel frequency deviation interval search for frame exceed setting-up time with the time interval of present frame time, re-start that described parallel frequency deviation is interval searches for.
In conjunction with the third possible implementation of first aspect or the first possible implementation of first aspect or the possible implementation of the second of first aspect or first aspect, in the 4th kind of possible implementation, described device also comprises:
3rd operating unit, for carrying out the 3rd operation to shared channel and/or control channel data and/or detectable signal in described correct frequency deviation interval, the described 3rd is operating as hybrid automatic repeat-request HARQ union operation.
Second aspect, provides a kind of method that frequency deviation is estimated, comprising:
Obtain the first frequency deviation value of the present frame of shared channel data according to set algorithm, it is interval that described first frequency deviation value is positioned at the first frequency deviation, and described first frequency deviation interval has between two MIRROR SITEs;
According to described first frequency deviation value and two mirror image interval values corresponding to described first frequency deviation value, carry out the search of parallel frequency deviation interval;
According to the result of described parallel frequency deviation search, obtain correct frequency deviation interval and frequency deviation value, carry out the demodulation of described shared channel and/or control channel data and/or detectable signal with and frequency deviation value interval according to described correct frequency deviation.
In the implementation that the first is possible, described according to described first frequency deviation value and two mirror image interval values corresponding to described first frequency deviation value, carry out the search of parallel frequency deviation interval, comprising:
Respectively in described first frequency deviation interval and described two MIRROR SITEs, described first frequency deviation value and described two mirror image interval values are carried out the first operation simultaneously, described first operation comprises: correction, pilot tone and/or data channel are estimated, separate mediation decoding;
Firmly sentence result according to the result of described decoding or the Soft Inform ation of chnnel coding or described Soft Inform ation, obtain the result of described parallel frequency deviation interval search.
In conjunction with the first possible implementation of second aspect or second aspect, in the implementation that the second is possible, described method also comprises:
When carrying out frequency deviation to the present frame of shared channel data and estimating, walking abreast according to the last time, frequency deviation is interval searches for the frequency deviation interval obtained, and obtains second frequency deviation value of described present frame in described frequency deviation interval;
Described second frequency deviation value according to obtaining carries out the second operation to described present frame, and described second operation comprises: data channel is estimated, separate mediation decoding.
In conjunction with the implementation that the second of second aspect is possible, in the implementation that the third is possible, described method also comprises:
The error frame number that the frequency deviation of carrying out present frame when the frequency deviation interval adopting last parallel frequency deviation interval search to obtain is estimated exceedes setting frame number, or last parallel frequency deviation interval search for frame exceed setting-up time with the time interval of present frame time, repeat described parallel frequency deviation interval search step.
In conjunction with the third possible implementation of second aspect or the first possible implementation of second aspect or the possible implementation of the second of second aspect or second aspect, in the 4th kind of possible implementation, the described result according to described parallel frequency deviation search, after obtaining correct frequency deviation interval and frequency deviation value, described method also comprises:
In described correct frequency deviation interval, carry out the 3rd operation to shared channel and/or control channel data and/or detectable signal, the described 3rd is operating as hybrid automatic repeat-request HARQ union operation.
Visible, the embodiment of the present invention is by the frequency deviation value of the present frame of the shared channel data according to set algorithm acquisition, the search of parallel frequency deviation interval is carried out to this frequency deviation value and two mirror image interval value, to obtain correct frequency deviation interval and frequency deviation value, and frequency deviation value interval according to described correct frequency deviation carries out the demodulation of described shared channel and/or control channel data and/or detectable signal again, effectively can reduce the time delay of frequency deviation interval search, improve the accuracy rate that frequency deviation is estimated.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structural representation of the device that Fig. 1 estimates for a kind of frequency deviation that the embodiment of the present invention provides;
The structural representation of the device that Fig. 2 estimates for the another kind of frequency deviation that the embodiment of the present invention provides;
Fig. 3 is that the frequency deviation of example estimates schematic diagram;
Fig. 4 is the frequency deviation estimated state transfer schematic diagram of example;
The flow chart of the method that Fig. 5 estimates for a kind of frequency deviation that the embodiment of the present invention provides;
The flow chart of the method that Fig. 6 estimates for the another kind of frequency deviation that the embodiment of the present invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The apparatus and method that the embodiment of the present invention provides a kind of frequency deviation to estimate, by the frequency deviation value of the present frame of shared channel data obtained according to set algorithm, the search of parallel frequency deviation interval is carried out to this frequency deviation value and two mirror image interval value, to obtain correct frequency deviation interval and frequency deviation value, and frequency deviation value interval according to described correct frequency deviation carries out the demodulation of described shared channel and/or control channel data and/or detectable signal again, effectively can reduce the time delay of frequency deviation interval search, improve the accuracy rate that frequency deviation is estimated.
The apparatus and method that the frequency deviation that the embodiment of the present invention provides is estimated may be used for user equipment side, namely carry out frequency deviation estimation to downlink data, also may be used for base station side, namely carry out frequency deviation estimation to upstream data.
Refer to Fig. 1, the structural representation of the device that a kind of frequency deviation provided for the embodiment of the present invention is estimated, this device 1000 comprises:
First acquiring unit 11, for obtaining the first frequency deviation value of the present frame of shared channel data according to set algorithm, it is interval that described first frequency deviation value is positioned at the first frequency deviation, and described first frequency deviation interval has between two MIRROR SITEs.
The embodiment of the present invention is estimated as example with the frequency deviation of upstream data.Because PUSCH is data channel, basic data demodulates ability after correction, to be ensured, so frequency deviation is estimated to carry out for PUSCH data, first ensure the correct demodulation of PUSCH channel data.
For be in when subscriber equipment non-high-speed move time, the upstream data that subscriber equipment sends is in conventional frequency deviation interval, can obtain the frequency deviation value of PUSCH data according to set algorithm.Frequency deviation is estimated to carry out according to every frame data.In the present embodiment, first acquiring unit 11 obtains the frequency deviation value of the present frame of PUSCH data according to set algorithm, be called smart frequency deviation, this smart frequency deviation is positioned at conventional frequency deviation interval, and the frequency deviation interval of this routine is generally (-1KHz, 1KHz), the frequency deviation interval of this routine has between two MIRROR SITEs, that is: (-3KHz ,-1KHz] and [1KHz, 3KHz).
Search unit 12, for according to described first frequency deviation value and two mirror image interval values corresponding to described first frequency deviation value, carries out the search of parallel frequency deviation interval.
According to the smart frequency deviation value that the first acquiring unit 11 obtains, be easy to two the mirror image interval values obtaining this smart frequency deviation value, such as, when smart frequency deviation value is 0.6KHz, two mirror image interval value is then-1.4KHz and 2.6KHz.Search unit 12 carries out the search of parallel frequency deviation interval according to smart frequency deviation value and two mirror image interval value in PUSCH channel, so-called parallel frequency deviation interval search, that is: carry out frequency deviation estimation respectively by the smart frequency deviation value of PUSCH Frame and two mirror image interval value in the frequency deviation of routine interval and two MIRROR SITE in PUSCH channel simultaneously.
Smart frequency deviation value and two mirror image interval value are carried out the search of parallel frequency deviation interval respectively simultaneously in three intervals, does not need each interval to measure one by one, effectively can reduce the time delay of frequency deviation interval search, improve the accuracy rate that frequency deviation is estimated.
Second acquisition unit 13, for the result according to described parallel frequency deviation search, obtains correct frequency deviation interval and frequency deviation value, carries out the demodulation of described shared channel and/or control channel data and/or detectable signal with and frequency deviation value interval according to described correct frequency deviation.
According to the result of parallel frequency deviation interval search, can judge that at the Search Results in which interval be correct, thus obtain correct frequency deviation interval and frequency deviation value, then and frequency deviation value interval according to this correct frequency deviation carries out Physical Uplink Control Channel (PhysicalUplinkControlChannel, PUCCH) demodulation of data and detectable signal (SoundingReferenceSignal, SRS).
Visible, according to the device that the embodiment of the present invention provides a kind of frequency deviation to estimate, by the frequency deviation value of the present frame of shared channel data obtained according to set algorithm, the search of parallel frequency deviation interval is carried out to this frequency deviation value and two mirror image interval value, to obtain correct frequency deviation interval and frequency deviation value, and frequency deviation value interval according to described correct frequency deviation carries out the demodulation of described shared channel and/or control channel data and/or detectable signal again, effectively can reduce the time delay of frequency deviation interval search, improve the accuracy rate that frequency deviation is estimated.
Refer to Fig. 2, the structural representation of the device that the another kind of frequency deviation provided for the embodiment of the present invention is estimated, this device 2000 comprises:
First acquiring unit 21, for obtaining the first frequency deviation value of the present frame of shared channel data according to set algorithm, it is interval that described first frequency deviation value is positioned at the first frequency deviation, and described first frequency deviation interval has between two MIRROR SITEs.
The function of the first acquiring unit 21 is identical with the function of the first acquiring unit 11 of previous embodiment, only specifically describes the acquisition of smart frequency deviation at this:
In the present embodiment, for PUSCH data for DMRS pilot frequency sequence.
First, the correlation between DMRS pilot frequency sequence is calculated according to formula (1):
Wherein, for NCP (NormalCP), I
0=3, I
1=10; For ECP (ExtendedCP), I
0=2, I
1=8;
N
rXrepresent reception antenna number;
N
sCfor the sub-carrier number in user bandwidth;
H represents channel factors;
Г (u) represents the correlation between subcarrier.
Then, smart frequency deviation is calculated according to formula (2):
Wherein E
rSrepresent the interval size that smart frequency deviation is estimated;
∠ Г (u) represents the radian getting correlation;
represent the smart frequency deviation value of this subcarrier.
Search unit 22, for according to described first frequency deviation value and two mirror image interval values corresponding to described first frequency deviation value, carries out the search of parallel frequency deviation interval.
In the present embodiment, search unit 22 comprises: the first operating unit 221 and the 3rd acquiring unit 222.
First operating unit 221, for respectively in described first frequency deviation interval and described two MIRROR SITEs, described first frequency deviation value and described two mirror image interval values are carried out the first operation simultaneously, and described first operation comprises: correction, pilot tone and/or data channel are estimated, separate mediation decoding.
Refer to Fig. 3, Fig. 3 is that the frequency deviation of example estimates schematic diagram, in figure 3, smart frequency deviation value is obtained by frequency deviation estimating modules (the 4th step in Fig. 3), and divide three intervals to be input to PUSCH channel respectively smart frequency deviation value and mirror image interval value thereof to carry out data demodulates, if first or re-start frequency deviation and estimate, then by shown in smart frequency deviation value and mirror image interval value and Fig. 3 thereof:
with
be input to correction module; If the last time has carried out the search of frequency deviation interval, obtain correct frequency deviation value, then by shown in smart frequency deviation value and mirror image interval value and Fig. 3 thereof:
with
be input to data channel estimation module.
For first or re-start frequency deviation and estimate, need smart frequency deviation value and mirror image interval value thereof to carry out to rectify a deviation simultaneously, pilot channel estimation, data channel are estimated, separate and be in harmonious proportion decoding; The search of frequency deviation interval is carried out for the last time, has obtained correct frequency deviation value, then only needed to adopt this frequency deviation value to carry out data channel estimation, separate mediation decoding.Correction, pilot channel estimation, data channel estimate, separate that the process of mediation decoding is prior art, do not repeat them here.
3rd acquiring unit 222, for firmly sentencing result according to the result of described decoding or the Soft Inform ation of chnnel coding or described Soft Inform ation, obtains the result of described parallel frequency deviation interval search.
3rd acquiring unit 222 according to PUSCH at 3 interval [-3KHz,-1KHz), [-1KHz, 1KHz), [1KHz, 3KHz) demodulation result (CRC or Soft Inform ation or obtain according to Soft Inform ation firmly sentence result) select correct correction interval;
If CRC=0; Namely current frequency offset value can make PUSCH proper solution timing;
Or, if when Soft Inform ation is greater than setting threshold (this setting threshold determines according to scene simulation);
Or, if firmly sentencing result is 1, when namely representing the correct demodulation of current PUSCH;
This interval exporting correct frequency deviation value is thought the scope at current frequency offset place.Such as correct frequency deviation value be by [-1KHz, 1KHz) export, so, current frequency deviation interval be [-1KHz, 1KHz).Frequency offset calculation next time just can calculate in this interval, and does not need to do interval search.
If CRC=1; Namely current frequency offset value can not make PUSCH proper solution timing, and losing efficacy in this frequency deviation interval, re-starts frequency deviation and estimate;
Or if when Soft Inform ation is less than setting threshold, losing efficacy in this frequency deviation interval, re-starts frequency deviation and estimate;
Or, if firmly sentencing result is 0, namely represent current PUSCH can not correctly demodulation time, losing efficacy in this frequency deviation interval, re-starts frequency deviation and estimate.
Second acquisition unit 23, for the result according to described parallel frequency deviation search, obtains correct frequency deviation interval and frequency deviation value, carries out the demodulation of described shared channel and/or control channel data and/or detectable signal with and frequency deviation value interval according to described correct frequency deviation.
According to court verdict, correct frequency deviation value is inputed to PUCCH, SRS and carries out demodulation (the 3rd step in Fig. 3).
4th acquiring unit 24, for when carrying out frequency deviation to the present frame of shared channel data and estimating, walking abreast according to the last time, frequency deviation is interval searches for the frequency deviation interval obtained, and obtains second frequency deviation value of described present frame in described frequency deviation interval.
Second operating unit 25, for carrying out the second operation according to described second frequency deviation value obtained to described present frame, described second operation comprises: data channel is estimated, separate mediation decoding.
The search of frequency deviation interval is carried out for the last time, has obtained correct frequency deviation value, then only needed to adopt this frequency deviation value to carry out data channel estimation, separate mediation decoding.
The error frame number that search unit 22 is also estimated for the frequency deviation of carrying out present frame when the frequency deviation interval adopting last parallel frequency deviation interval search to obtain exceedes setting frame number, or last parallel frequency deviation interval search for frame exceed setting-up time with the time interval of present frame time, re-start that described parallel frequency deviation is interval searches for.
Referring to Fig. 4, is the frequency deviation estimated state transfer schematic diagram of example.Under high ferro scene, the result estimated according to smart frequency deviation and its mirror image have multiple probable value at possible frequency deviation interval.But because the translational speed of terminal can not be suddenlyd change, the frequency deviation of signal also can not change suddenly.When hold mode (HOLD), this module value be chosen near last frequency deviation estimated value from 3 possibility frequency deviation values exports as final frequency deviation value, but, if the frequency deviation estimated value mistake of last time or interval time long, then can cause the mistake that this frequency deviation is estimated.Now, system enters search condition (SEEK), travels through possible interval, determines correct value according to CRC feedback (or other).After searching correct value, reenter hold mode.
Below hold mode and search condition are described in detail:
At hold mode (HOLD), interval estimation estimates input according to the frequency offset estimation result of last time and this smart frequency deviation, determines the result that this frequency deviation is estimated.
(1) entry condition: meet following arbitrary condition, enter HOLD state.
Condition A: initially access.
When user initially accesses, because PUSCH data are after system initially accesses (PRACH), so subframe 0 directly enters HOLD state.
Condition B: searched for.
When CRC was fed back to for 0 (or when other judgment condition meet), SEEK state terminates, and enters HOLD state.
(2) exit criteria: meet condition arbitrarily, enter SEEK state.
Condition C: miss frame continuously.
If each subframe before present frame is HOLD state, then start continuously frame counter Count by mistake
cRCErr, counter algorithm is as shown in formula (3):
If Count
cRCErr(u)>=N
cRCDelay, N
cRCDelayfor the time delay that CRC feedback needs; Then be judged to miss frame continuously.Namely condition C meets.
Condition D: time-out lost efficacy
Read and record current System Frame Number and subframe numbers; The System Frame Number estimated according to current System Frame Number and subframe numbers and last frequency deviation and subframe numbers.Calculate Δ t (u, u-1):
Suppose that Δ t (u, v) represents the time interval between subframe u and subframe v, can by the System Frame Number n of its corresponding subframe
f(u) and subframe numbers n
sfu () calculates, as shown in following formula (4):
Δ t (u, v)=(10n
f(u)+n
sf(u))-(10n
f(v)+n
sf(v)) ... formula (4)
If Δ t (u, u-1) >T
mintime, T
minfor minimal error time delay, determine by system emulation; Then judge that time-out lost efficacy, namely condition D sets up.
The error frame number that the frequency deviation of carrying out present frame when the frequency deviation interval adopting last parallel frequency deviation interval search to obtain is estimated exceedes setting frame number, or last parallel frequency deviation interval search for frame exceed setting-up time with the time interval of present frame time, search unit 22 re-starts that described parallel frequency deviation is interval searches for.
3rd operating unit 26, for carrying out the 3rd operation to shared channel and/or control channel data and/or detectable signal in described correct frequency deviation interval, the described 3rd is operating as hybrid automatic repeat-request HARQ union operation.
Once confirm correct frequency separation, hybrid automatic repeat-request (HybirdAutomaticRetransmissionRequest, HARQ) can also be completed in this interval and merge, further improving performance.
Visible, according to the device that the embodiment of the present invention provides a kind of frequency deviation to estimate, by the frequency deviation value of the present frame of shared channel data obtained according to set algorithm, the search of parallel frequency deviation interval is carried out to this frequency deviation value and two mirror image interval value, to obtain correct frequency deviation interval and frequency deviation value, and frequency deviation value interval according to described correct frequency deviation carries out the demodulation of described shared channel and/or control channel data and/or detectable signal again, effectively can reduce the time delay of frequency deviation interval search, improve the accuracy rate that frequency deviation is estimated, promote PUSCH demodulation performance.
Refer to Fig. 5, the flow chart of the method that a kind of frequency deviation provided for the embodiment of the present invention is estimated, the method comprises the following steps:
Step S101, obtains the first frequency deviation value of the present frame of shared channel data according to set algorithm, it is interval that described first frequency deviation value is positioned at the first frequency deviation, and described first frequency deviation interval has between two MIRROR SITEs.
The embodiment of the present invention is estimated as example with the frequency deviation of upstream data.Because PUSCH is data channel, basic data demodulates ability after correction, to be ensured, so frequency deviation is estimated to carry out for PUSCH data, first ensure the correct demodulation of PUSCH channel data.
For be in when subscriber equipment non-high-speed move time, the upstream data that subscriber equipment sends is in conventional frequency deviation interval, can obtain the frequency deviation value of PUSCH data according to set algorithm.Frequency deviation is estimated to carry out according to every frame data.In the present embodiment, the frequency deviation value of the present frame of PUSCH data is obtained according to set algorithm, be called smart frequency deviation, this smart frequency deviation is positioned at conventional frequency deviation interval, and the frequency deviation interval of this routine is generally (-1KHz, 1KHz), the frequency deviation interval of this routine has between two MIRROR SITEs, that is: (-3KHz ,-1KHz] and [1KHz, 3KHz).
Step S102, according to described first frequency deviation value and two mirror image interval values corresponding to described first frequency deviation value, carries out the search of parallel frequency deviation interval.
According to the smart frequency deviation value that step S101 obtains, be easy to two the mirror image interval values obtaining this smart frequency deviation value, such as, when smart frequency deviation value is 0.6KHz, two mirror image interval value is then-1.4KHz and 2.6KHz.In this step, in PUSCH channel, the search of parallel frequency deviation interval is carried out according to smart frequency deviation value and two mirror image interval value, so-called parallel frequency deviation interval search, that is: carry out frequency deviation estimation respectively by the smart frequency deviation value of PUSCH Frame and two mirror image interval value in the frequency deviation of routine interval and two MIRROR SITE in PUSCH channel simultaneously.
Smart frequency deviation value and two mirror image interval value are carried out the search of parallel frequency deviation interval respectively simultaneously in three intervals, does not need each interval to measure one by one, effectively can reduce the time delay of frequency deviation interval search, improve the accuracy rate that frequency deviation is estimated.
Step S103, according to the result of described parallel frequency deviation search, obtains correct frequency deviation interval and frequency deviation value, carries out the demodulation of described shared channel and/or control channel data and/or detectable signal with and frequency deviation value interval according to described correct frequency deviation.
According to the result of parallel frequency deviation interval search, can judge that at the Search Results in which interval be correct, thus obtain correct frequency deviation interval and frequency deviation value, then and frequency deviation value interval according to this correct frequency deviation carries out the demodulation of PUCCH data and SRS.
Visible, according to a kind of method that the embodiment of the present invention provides frequency deviation to estimate, by the frequency deviation value of the present frame of shared channel data obtained according to set algorithm, the search of parallel frequency deviation interval is carried out to this frequency deviation value and two mirror image interval value, to obtain correct frequency deviation interval and frequency deviation value, and frequency deviation value interval according to described correct frequency deviation carries out the demodulation of described shared channel and/or control channel data and/or detectable signal again, effectively can reduce the time delay of frequency deviation interval search, improve the accuracy rate that frequency deviation is estimated.
Refer to Fig. 6, the flow chart of the method that the another kind of frequency deviation provided for the embodiment of the present invention is estimated, the method comprises the following steps:
Step S201, obtains the first frequency deviation value of the present frame of shared channel data according to set algorithm, it is interval that described first frequency deviation value is positioned at the first frequency deviation, and described first frequency deviation interval has between two MIRROR SITEs.
Step S201 is identical with the step S101 of previous embodiment, only specifically describes the acquisition of smart frequency deviation at this:
In the present embodiment, for PUSCH data for DMRS pilot frequency sequence.
First, the correlation between DMRS pilot frequency sequence is calculated according to formula (1);
Then, smart frequency deviation is calculated according to formula (2).
Step S202, respectively in described first frequency deviation interval and described two MIRROR SITEs, described first frequency deviation value and described two mirror image interval values are carried out the first operation simultaneously, and described first operation comprises: correction, pilot tone and/or data channel are estimated, separate mediation decoding.
Refer to Fig. 3, Fig. 3 is that the frequency deviation of example estimates schematic diagram, in figure 3, smart frequency deviation value is obtained by frequency deviation estimating modules (the 4th step in Fig. 3), and divide three intervals to be input to PUSCH channel respectively smart frequency deviation value and mirror image interval value thereof to carry out data demodulates, if first or re-start frequency deviation and estimate, then by shown in smart frequency deviation value and mirror image interval value and Fig. 3 thereof:
with
be input to correction module; If the last time has carried out the search of frequency deviation interval, obtain correct frequency deviation value, then by shown in smart frequency deviation value and mirror image interval value and Fig. 3 thereof:
with
be input to data channel estimation module.
For first or re-start frequency deviation and estimate, need smart frequency deviation value and mirror image interval value thereof to carry out to rectify a deviation simultaneously, pilot channel estimation, data channel are estimated, separate and be in harmonious proportion decoding; The search of frequency deviation interval is carried out for the last time, has obtained correct frequency deviation value, then only needed to adopt this frequency deviation value to carry out data channel estimation, separate mediation decoding.Correction, pilot channel estimation, data channel estimate, separate that the process of mediation decoding is prior art, do not repeat them here.
Step S203, sentences result firmly according to the result of described decoding or the Soft Inform ation of chnnel coding or described Soft Inform ation, obtains the result of described parallel frequency deviation interval search.
According to PUSCH 3 intervals [-3KHz ,-1KHz), [-1KHz, 1KHz), [1KHz, 3KHz) demodulation result (CRC or Soft Inform ation or obtain according to Soft Inform ation firmly sentence result) select correct correction interval;
If CRC=0; Namely current frequency offset value can make PUSCH proper solution timing;
Or, if when Soft Inform ation is greater than setting threshold (this setting threshold determines according to scene simulation);
Or, if firmly sentencing result is 1, when namely representing the correct demodulation of current PUSCH;
This interval exporting correct frequency deviation value is thought the scope at current frequency offset place.Such as correct frequency deviation value be by [-1KHz, 1KHz) export, so, current frequency deviation interval be [-1KHz, 1KHz).Frequency offset calculation next time just can calculate in this interval, and does not need to do interval search.
If CRC=1; Namely current frequency offset value can not make PUSCH proper solution timing, and losing efficacy in this frequency deviation interval, re-starts frequency deviation and estimate;
Or if when Soft Inform ation is less than setting threshold, losing efficacy in this frequency deviation interval, re-starts frequency deviation and estimate;
Or, if firmly sentencing result is 0, namely represent current PUSCH can not correctly demodulation time, losing efficacy in this frequency deviation interval, re-starts frequency deviation and estimate.
Step S204, according to the result of described parallel frequency deviation search, obtains correct frequency deviation interval and frequency deviation value, carries out the demodulation of described shared channel and/or control channel data and/or detectable signal with and frequency deviation value interval according to described correct frequency deviation.
According to court verdict, correct frequency deviation value is inputed to PUCCH, SRS and carries out demodulation (the 3rd step in Fig. 3).
Step S205, when carrying out frequency deviation to the present frame of shared channel data and estimating, walking abreast according to the last time, frequency deviation is interval searches for the frequency deviation interval obtained, and obtains second frequency deviation value of described present frame in described frequency deviation interval.
Step S206, the error frame number that the frequency deviation of carrying out present frame when the frequency deviation interval adopting last parallel frequency deviation interval search to obtain is estimated exceedes setting frame number, or last parallel frequency deviation interval search for frame exceed setting-up time with the time interval of present frame time, repeat described parallel frequency deviation interval search step.
Referring to Fig. 4, is the frequency deviation estimated state transfer schematic diagram of example.Under high ferro scene, the result estimated according to smart frequency deviation and its mirror image have multiple probable value at possible frequency deviation interval.But because the translational speed of terminal can not be suddenlyd change, the frequency deviation of signal also can not change suddenly.When hold mode (HOLD), this module value be chosen near last frequency deviation estimated value from 3 possibility frequency deviation values exports as final frequency deviation value, but, if the frequency deviation estimated value mistake of last time or interval time long, then can cause the mistake that this frequency deviation is estimated.Now, system enters search condition (SEEK), travels through possible interval, determines correct value according to CRC feedback (or other).After searching correct value, reenter hold mode.
The error frame number that the frequency deviation of carrying out present frame when the frequency deviation interval adopting last parallel frequency deviation interval search to obtain is estimated exceedes setting frame number, or last parallel frequency deviation interval search for frame exceed setting-up time with the time interval of present frame time, re-start that described parallel frequency deviation is interval searches for.
Step S207, described second frequency deviation value according to obtaining carries out the second operation to described present frame, and described second operation comprises: data channel is estimated, separate mediation decoding.
The search of frequency deviation interval is carried out for the last time, has obtained correct frequency deviation value, then only needed to adopt this frequency deviation value to carry out data channel estimation, separate mediation decoding.
Step S208, in described correct frequency deviation interval, carry out the 3rd operation to shared channel and/or control channel data and/or detectable signal, the described 3rd is operating as hybrid automatic repeat-request HARQ union operation.
Once confirm correct frequency separation, HARQ can also be completed in this interval and merge, further improving performance.
Visible, according to a kind of method that the embodiment of the present invention provides frequency deviation to estimate, by the frequency deviation value of the present frame of shared channel data obtained according to set algorithm, the search of parallel frequency deviation interval is carried out to this frequency deviation value and two mirror image interval value, to obtain correct frequency deviation interval and frequency deviation value, and frequency deviation value interval according to described correct frequency deviation carries out the demodulation of described shared channel and/or control channel data and/or detectable signal again, effectively can reduce the time delay of frequency deviation interval search, improve the accuracy rate that frequency deviation is estimated, promote PUSCH demodulation performance.
It should be noted that, for aforesaid each embodiment of the method, in order to simple description, therefore it is all expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not by the restriction of described sequence of movement, because according to the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in specification all belongs to preferred embodiment, and involved action and module might not be that the present invention is necessary.
In the above-described embodiments, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiments.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention can use hardware implementing, or firmware realizes, or their compound mode realizes.When implemented in software, above-mentioned functions can be stored in computer-readable medium or as the one or more instruction on computer-readable medium or code and transmit.Computer-readable medium comprises computer-readable storage medium and communication media, and wherein communication media comprises any medium being convenient to transmit computer program from a place to another place.Storage medium can be any usable medium that computer can access.As example but be not limited to: computer-readable medium can comprise random access memory (RandomAccessMemory, RAM), read-only memory (Read-OnlyMemory, ROM), EEPROM (Electrically Erasable Programmable Read Only Memo) (ElectricallyErasableProgrammableRead-OnlyMemory, EEPROM), read-only optical disc (CompactDiscRead-OnlyMemory, or other optical disc storage CD-ROM), magnetic disk storage medium or other magnetic storage apparatus, or the program code that can be used in carrying or storing the expectation with instruction or data structure form also can by any other medium of computer access.In addition.Any connection can be suitable become computer-readable medium.Such as, if software uses coaxial cable, optical fiber cable, twisted-pair feeder, Digital Subscriber Line (DigitalSubscriberLine, DSL) or the wireless technology of such as infrared ray, radio and microwave and so on from website, server or other remote source, so the wireless technology of coaxial cable, optical fiber cable, twisted-pair feeder, DSL or such as infrared ray, wireless and microwave and so on be included in affiliated medium fixing in.As used in the present invention, dish (Disk) and dish (disc) comprise compression laser disc (CD), laser dish, laser disc, Digital Versatile Disc (DVD), floppy disk and Blu-ray Disc, the copy data of the usual magnetic of its mid-game, dish then carrys out the copy data of optics with laser.Combination above also should be included within the protection range of computer-readable medium.
In a word, the foregoing is only the preferred embodiment of technical solution of the present invention, be not intended to limit protection scope of the present invention.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 (10)
1. a device for frequency deviation estimation, is characterized in that, comprising:
First acquiring unit, for obtaining the first frequency deviation value of the present frame of shared channel data according to set algorithm, it is interval that described first frequency deviation value is positioned at the first frequency deviation, and described first frequency deviation interval has between two MIRROR SITEs;
Search unit, for according to described first frequency deviation value and two mirror image interval values corresponding to described first frequency deviation value, carries out the search of parallel frequency deviation interval;
Second acquisition unit, for the result according to described parallel frequency deviation search, obtains correct frequency deviation interval and frequency deviation value, carries out the demodulation of described shared channel and/or control channel data and/or detectable signal with and frequency deviation value interval according to described correct frequency deviation.
2. device as claimed in claim 1, it is characterized in that, described search unit comprises:
First operating unit, for respectively in described first frequency deviation interval and described two MIRROR SITEs, described first frequency deviation value and described two mirror image interval values are carried out the first operation simultaneously, and described first operation comprises: correction, pilot tone and/or data channel are estimated, separate mediation decoding;
3rd acquiring unit, for firmly sentencing result according to the result of described decoding or the Soft Inform ation of chnnel coding or described Soft Inform ation, obtains the result of described parallel frequency deviation interval search.
3. device as claimed in claim 1 or 2, is characterized in that, also comprise:
4th acquiring unit, for when carrying out frequency deviation to the present frame of shared channel data and estimating, walking abreast according to the last time, frequency deviation is interval searches for the frequency deviation interval obtained, and obtains second frequency deviation value of described present frame in described frequency deviation interval;
Second operating unit, for carrying out the second operation according to described second frequency deviation value obtained to described present frame, described second operation comprises: data channel is estimated, separate mediation decoding.
4. device as claimed in claim 3, is characterized in that, described search unit also for:
The error frame number that the frequency deviation of carrying out present frame when the frequency deviation interval adopting last parallel frequency deviation interval search to obtain is estimated exceedes setting frame number, or last parallel frequency deviation interval search for frame exceed setting-up time with the time interval of present frame time, re-start that described parallel frequency deviation is interval searches for.
5. the device as described in claim 1-4 any one, is characterized in that, also comprises:
3rd operating unit, for carrying out the 3rd operation to shared channel and/or control channel data and/or detectable signal in described correct frequency deviation interval, the described 3rd is operating as hybrid automatic repeat-request HARQ union operation.
6. a method for frequency deviation estimation, is characterized in that, comprising:
Obtain the first frequency deviation value of the present frame of shared channel data according to set algorithm, it is interval that described first frequency deviation value is positioned at the first frequency deviation, and described first frequency deviation interval has between two MIRROR SITEs;
According to described first frequency deviation value and two mirror image interval values corresponding to described first frequency deviation value, carry out the search of parallel frequency deviation interval;
According to the result of described parallel frequency deviation search, obtain correct frequency deviation interval and frequency deviation value, carry out the demodulation of described shared channel and/or control channel data and/or detectable signal with and frequency deviation value interval according to described correct frequency deviation.
7. method as claimed in claim 6, is characterized in that, described according to described first frequency deviation value and two mirror image interval values corresponding to described first frequency deviation value, carries out the search of parallel frequency deviation interval, comprising:
Respectively in described first frequency deviation interval and described two MIRROR SITEs, described first frequency deviation value and described two mirror image interval values are carried out the first operation simultaneously, described first operation comprises: correction, pilot tone and/or data channel are estimated, separate mediation decoding;
Firmly sentence result according to the result of described decoding or the Soft Inform ation of chnnel coding or described Soft Inform ation, obtain the result of described parallel frequency deviation interval search.
8. method as claimed in claims 6 or 7, is characterized in that, also comprise:
When carrying out frequency deviation to the present frame of shared channel data and estimating, walking abreast according to the last time, frequency deviation is interval searches for the frequency deviation interval obtained, and obtains second frequency deviation value of described present frame in described frequency deviation interval;
Described second frequency deviation value according to obtaining carries out the second operation to described present frame, and described second operation comprises: data channel is estimated, separate mediation decoding.
9. method as claimed in claim 8, is characterized in that, also comprise:
The error frame number that the frequency deviation of carrying out present frame when the frequency deviation interval adopting last parallel frequency deviation interval search to obtain is estimated exceedes setting frame number, or last parallel frequency deviation interval search for frame exceed setting-up time with the time interval of present frame time, repeat described parallel frequency deviation interval search step.
10. the method as described in claim 6-9 any one, is characterized in that, the described result according to described parallel frequency deviation search, after obtaining correct frequency deviation interval and frequency deviation value, also comprises:
In described correct frequency deviation interval, carry out the 3rd operation to shared channel and/or control channel data and/or detectable signal, the described 3rd is operating as hybrid automatic repeat-request HARQ union operation.
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