CN101803320B - Mapping method for beam forming dedicated pilot and physical resource block - Google Patents
Mapping method for beam forming dedicated pilot and physical resource block Download PDFInfo
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- CN101803320B CN101803320B CN200880107151XA CN200880107151A CN101803320B CN 101803320 B CN101803320 B CN 101803320B CN 200880107151X A CN200880107151X A CN 200880107151XA CN 200880107151 A CN200880107151 A CN 200880107151A CN 101803320 B CN101803320 B CN 101803320B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
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- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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Abstract
Mapping methods for beam forming dedicated pilot and physical resource block are respectively used for mapping of beam forming dedicated pilot and physical resource block in long term evolution. One of the methods includes the steps of: frequency domain interval set processing, setting the frequency domain interval of the beam forming dedicated pilot which is mapped to the same time domain as 5 sub- carriers(S202); time domain interval set process, setting the time domain interval of the beam forming dedicated pilot which is mapped to different time domains as 3 OFDM symbols(S204); initial mapping processing, mapping the first beam forming dedicated pilot to the initial position, therein, A and B represent the initial position, A represents frequency domain initial position, and B represents time domain initial position(S206); carrying out mapping processing of other beam forming dedicated pilots according to the initial position, frequency domain interval, time domain interval and preset rules of the first beam forming dedicated pilot(S208).
Description
Technical field
The present invention relates to the dedicated pilot and the mapping method of Physical Resource Block in the moving communicating field long evolving system (Long term evolution, be called for short LTE), particularly, relate to the mapping method of wave beam formation dedicated pilot and Physical Resource Block.
Background technology
At LTE (Long term evolution; Long evolving system) the existing version 3GPP of standard (3rdGeneration partnership project; The third generation mobile gpp) among the TR 36.211; Stipulated to support the beam-forming technology of single current, formed and precoding that also clear and definite wave beam formation is applied to antenna number more than or equal to four condition in order to distinguish wave beam.But, only having defined four road public guide frequencies in the LTE standard existing version, so only adopted four road public guide frequencies in the reality, the channel information of every antenna port is all extracted by pairing public guide frequency.Therefore, greater than 4 o'clock, can't obtain the real channel information of every antenna in antenna number.
If increase the quantity of public guide frequency; Insert public guide frequency according to eight antenna ports, pilot-frequency expense will be very big so, and on/the descending real channel that estimates is also variant; Still the weights feedback information that needs wave beam to form; And wave beam formation descending special pilot frequency can estimate the channel that has directivity after wave beam forms, and, estimates that through dedicated pilot the channel information that obtains has comprised real wireless channel and wave beam forms the weights of handling that is; Therefore adopting wave beam to form descending special pilot frequency is that an expense is little, the solution that performance is good.
As stated; In existing LTE standard version; When base station end adopts wave beam greater than 4 antennas to form; Public guide frequency can't obtain whole channel informations, and exists wave beam to form the problem of the feedback overhead of weights, needs a kind of new wave beam to form the mapping method of dedicated pilot and Physical Resource Block.
Summary of the invention
Consider exist in the correlation technique in existing LTE standard version; When base station end adopted wave beam greater than 4 antennas to form, public guide frequency can't obtain whole channel informations, and exist wave beam form weights feedback overhead problem and the present invention is proposed; For this reason; The present invention aims to provide the mapping method that a kind of wave beam forms dedicated pilot and Physical Resource Block, and it is through the position of clear and definite frequency pilot sign in Physical Resource Block, makes existing LTE version when using dedicated pilot according to the embodiment of the invention to design; Can support wave beam to form with more excellent performance simultaneously with less expense.
According to an aspect of the present invention; Provide a kind of wave beam to form the mapping method of dedicated pilot and Physical Resource Block; This method is used for the mapping that the long evolving system wave beam forms dedicated pilot and Physical Resource Block; Wherein, Physical Resource Block comprises 12 number of sub-carrier at frequency domain, comprises 14 OFDM symbols in time domain.
This method comprises following processing: frequency domain interval is provided with processing, forms dedicated pilot for the wave beam that is mapped to same time domain, and its frequency domain interval is set to 5 number of sub-carrier; Time domain interval is provided with processing, forms dedicated pilot for the wave beam that is mapped to different time domain, and its time domain is set to 3 OFDM symbols; Initial mapping processing forms dedicated pilot with first wave beam and is mapped to initial position, and wherein, initial position representes that with A and B wherein, A is a frequency domain initial position, and B is the time domain initial position; Initial position, frequency domain interval and the time domain interval and the pre-defined rule that form dedicated pilot according to first wave beam carry out the mapping treatment that other wave beams form dedicated pilot.
Wherein, in initial mapping processing, A is set to: after first public guide frequency on B the OFDM symbol.
Preferably, above-mentioned pre-defined rule is: form dedicated pilot at two wave beams of same time domain mapping; The frequency domain position that first wave beam that is mapped to M OFDM symbol in time domain forms dedicated pilot is set to: be located at the centre position of frequency domain position that time domain is mapped to a plurality of wave beams formation dedicated pilots of B OFDM symbol; Wherein, M=B+ time domain interval+1; The frequency domain position that is mapped to two wave beams formation dedicated pilots of N OFDM symbol in time domain is set to: be positioned at the identical position of frequency domain position that forms dedicated pilots with two wave beams that are mapped to B OFDM symbol in time domain; Wherein, N=B+2* time domain interval+2.
Preferably, A=2, B=5.
Based on this, the operation of carrying out the mapping treatment of other wave beams formation dedicated pilots is specially: second wave beam formed dedicated pilot be mapped to the 5th OFDM symbol in time domain, be mapped to the 8th number of sub-carrier at frequency domain; The 3rd wave beam formed dedicated pilot be mapped to the 9th OFDM symbol, be mapped to the 5th number of sub-carrier at frequency domain in time domain; The 4th wave beam formed dedicated pilot be mapped to the 9th OFDM symbol, be mapped to the 11 number of sub-carrier at frequency domain in time domain; The 5th wave beam formed dedicated pilot be mapped to the 13 OFDM symbol in time domain, frequency domain is mapped to second number of sub-carrier; The 6th wave beam formed dedicated pilot be mapped to the 13 OFDM symbol in time domain, frequency domain is mapped to the 8th number of sub-carrier.
According to a further aspect in the invention; Provide a kind of wave beam to form the mapping method of dedicated pilot and Physical Resource Block; This method is used for the mapping that the long evolving system wave beam forms dedicated pilot and Physical Resource Block; Wherein, Physical Resource Block comprises 12 number of sub-carrier at frequency domain, comprises 12 OFDM symbols in time domain.
This method comprises following processing: frequency domain interval is provided with processing, forms dedicated pilot for the wave beam that is mapped to same time domain, and its frequency domain interval is set to 5 number of sub-carrier; Time domain interval is provided with processing, forms dedicated pilot for the wave beam that is mapped to different time domain, and its time domain is set to 2 or 3 OFDM symbols; Initial mapping processing forms dedicated pilot with first wave beam and is mapped to initial position, and wherein, initial position representes that with A and B wherein, A is a frequency domain initial position, and B is the time domain initial position; Initial position, frequency domain interval and the time domain interval and the pre-defined rule that form dedicated pilot according to first wave beam carry out the mapping treatment that other wave beams form dedicated pilot.
Wherein, in initial mapping processing, A is set to: after first public guide frequency on B the OFDM symbol.
Preferably, above-mentioned time domain interval is provided with to handle and is specially: at first time domain interval is set to 2 OFDM symbols, and wave beam is formed dedicated pilot be mapped to M OFDM symbol, wherein, M=B+2+1; Time domain interval is set to 3 OFDM symbols again, and wave beam is formed dedicated pilot be mapped to N OFDM symbol, wherein, N=B+2+3+2.
Preferably, above-mentioned pre-defined rule is: form dedicated pilot at two wave beams of same time domain mapping; The frequency domain position that first wave beam that is mapped to M OFDM symbol in time domain forms dedicated pilot is set to: be located at the centre position of frequency domain position that time domain is mapped to a plurality of wave beams formation dedicated pilots of B OFDM symbol; The frequency domain position that is mapped to two wave beams formation dedicated pilots of N OFDM symbol in time domain is set to: be positioned at the identical position of frequency domain position that forms dedicated pilots with two wave beams that are mapped to B OFDM symbol in time domain.
Preferably, A=2, B=4.
Based on this, the above-mentioned operation of carrying out the mapping treatment of other wave beams formation dedicated pilots is specially: second wave beam formed dedicated pilot be mapped to the 4th OFDM symbol in time domain, be mapped to the 8th number of sub-carrier at frequency domain; The 3rd wave beam formed dedicated pilot be mapped to the 7th OFDM symbol, be mapped to the 5th number of sub-carrier at frequency domain in time domain; The 4th wave beam formation dedicated pilot is mapped to the 7th OFDM symbol in time domain exists, frequency domain is mapped to the 11 number of sub-carrier; The 5th wave beam formed dedicated pilot be mapped to the 11 OFDM symbol, be mapped to second number of sub-carrier at frequency domain in time domain; The 6th wave beam formed dedicated pilot be mapped to the 11 OFDM symbol, be mapped to the 8th number of sub-carrier at frequency domain in time domain.
Through above-mentioned at least one technical scheme provided by the invention; Realized following beneficial effect: through the position of clear and definite frequency pilot sign in Physical Resource Block; Solved when base station end adopts wave beam greater than 4 antennas to form, public guide frequency can't obtain the problem of whole channel informations in the existing LTE standard version; And comprise the processing weights that real channel information and wave beam form through the channel information that dedicated pilot is obtained, make that UE need not to form emission value obtaining wave beam specially, thereby avoided wave beam to form the feedback overhead of weights.
Other features and advantages of the present invention will be set forth in specification subsequently, and, partly from specification, become obvious, perhaps understand through embodiment of the present invention.The object of the invention can be realized through the structure that in the specification of being write, claims and accompanying drawing, is particularly pointed out and obtained with other advantages.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used to explain the present invention with embodiments of the invention, is not construed as limiting the invention.In the accompanying drawings:
Figure 1A be according to regulation among the 3GPP TR 36.211 of the embodiment of the invention in the frame structure of normal cyclic prefix, the Physical Resource Block sketch map of two-way public guide frequency before adopting;
Figure 1B be according to regulation among the 3GPP TR 36.211 of the embodiment of the invention in the frame structure of long loop prefix, the Physical Resource Block sketch map of two-way public guide frequency before adopting;
Fig. 2 is the flow chart that forms the mapping method of dedicated pilot and Physical Resource Block according to the wave beam of the inventive method embodiment one;
Fig. 3 is the flow chart that forms the mapping method of dedicated pilot and Physical Resource Block according to the wave beam of the inventive method embodiment two;
Fig. 4 A is in the method according to the inventive method embodiment one, and wave beam forms the mapping method sketch map of descending special pilot frequency and Physical Resource Block;
Fig. 4 B is in the method according to the inventive method embodiment two, and wave beam forms the mapping method sketch map of descending special pilot frequency and Physical Resource Block.
Embodiment
As stated; Have following problem in the existing LTE standard version: when adopting wave beam to form, public guide frequency can't be accomplished data channel and detect, in view of this; The embodiment of the invention provides a kind of expense little, and the excellent wave beam of performance forms the mapping method of dedicated pilot and Physical Resource Block.
Form the descending special pilot frequency working hypothesis according to the wave beam that proposes in the 50th meeting of LTE standard; When adopting wave beam to form descending special pilot frequency; Only insert the two-way public guide frequency; Be used for the detection of omnidirectional's control channel, the two-way public guide frequency is as shown in Figure 1 with the mapping relations of the Physical Resource Block (Resource Block is hereinafter to be referred as RB) of minimum.Wherein, Figure 1A be among the 3GPP TR 36.211 regulation in the frame structure of normal cyclic prefix; The Physical Resource Block sketch map of two-way public guide frequency before adopting; Figure 1B be among the 3GPPTR 36.211 regulation in the frame structure of long loop prefix, the Physical Resource Block sketch map of two-way public guide frequency before adopting.
In addition, in the sketch map shown in the left side of Figure 1A and Figure 1B, show the R1 that is not used in the transmission on the antenna port 1, show the common reference symbol R0 on the antenna port 0, also show in addition resource element (k, l); In the sketch map shown in the right side of Figure 1A and Figure 1B, show the R0 that is not used in the transmission on the antenna port 1, show the common reference symbol R1 on the antenna port 0, also show in addition resource element (k, l).
Below will provide the embodiment of the invention respectively to frame structure that adopts normal cyclic prefix (Normal cyclic prefix) and the frame structure that adopts long loop prefix (Extend cyclic prefix) respectively.Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for explanation and explains the present invention, and be not used in qualification the present invention.
Method embodiment one
According to the embodiment of the invention; Provide a kind of wave beam to form the mapping method of dedicated pilot and Physical Resource Block; This method can be used for the mapping of wave beam formation dedicated pilot and Physical Resource Block in the frame structure (RB comprises 12 number of sub-carrier at frequency domain, comprises 14 OFDM symbols in time domain) that the LTE system adopts normal cyclic prefix.
As shown in Figure 2, this method comprises following processing (step S202-step S208):
Step S202, frequency domain interval is provided with processing, forms dedicated pilot for the wave beam that is mapped to same time domain, and its frequency domain interval is set to 5 number of sub-carrier;
Step S204, time domain interval is provided with processing, forms dedicated pilot for the wave beam that is mapped to different time domain, and its time domain is set to 3 OFDM symbols;
Step S206, initial mapping processing forms dedicated pilot with first wave beam and is mapped to initial position, and wherein, initial position representes that with A and B wherein, A is a frequency domain initial position, and B is the time domain initial position;
Step S208, initial position, frequency domain interval and the time domain interval and the pre-defined rule that form dedicated pilot according to first wave beam carry out the mapping treatment that other wave beams form dedicated pilot.
Below will describe above-mentioned each item in detail handles.
(1) step S202, frequency domain interval is provided with processing (perhaps be called frequency domain density processing is set)
The present invention confirms that in a RB each wave beam forms descending special pilot frequency in frequency domain interval five number of sub-carrier; When a plurality of RB sent together, the frequency domain density of dedicated pilot kept evenly distributing, all the time interval five number of sub-carrier.
The density that dedicated pilot symbol is inserted at frequency domain is determined by coherence bandwidth; Therefore for avoiding the distortion of channel estimating; The minimum of pilot density is determined by nyquist sampling theorem; For further guaranteeing performance for estimating channel, we use the number of pilot symbols of sampling thheorem twice in the present invention, then the frequency domain interval S of pilot tone
fShown in (1):
In formula 1, Δ f is a subcarrier spacing, τ
MaxBe the maximum delay of channel, this parameter is with reference to 3GPPTR25.996.Therefore, the design of the dedicated pilot of frequency domain interval 5 number of sub-carrier can be satisfied the requirement of channel estimating fully.
(2) step S204, time domain interval is provided with processing (perhaps be called time domain density processing is set)
The density that frequency pilot sign is inserted in time domain is by determining that for avoiding the distortion of channel estimating, the minimum of pilot density is determined by nyquist sampling theorem coherence time.In order further to improve performance for estimating channel, use the number of pilot symbols of sampling thheorem twice among the present invention, then the time domain interval S of pilot tone
tShown in (2):
In formula (2), f
dBe maximum doppler frequency, the maximum translational speed of LTE regulation UE is 350km/h, at this, and f
d=648Hz.T
fIt is the time of an OFDM symbol.Wave beam forms dedicated pilot three OFDM symbols at interval, can satisfy the requirement of channel estimating at a high speed down.
Through the processing that is provided with of above-mentioned time domain interval and frequency domain interval, make dedicated pilot very even in time domain and frequency domain distribution, can guarantee the quality of channel estimating.
(3) step S206, initial mapping processing
In this step, A is set to: after first public guide frequency on B the OFDM symbol, specifically referring to Fig. 4 A.
Preferably, A=2, B=5 promptly, forms dedicated pilot with first wave beam and is mapped to second number of sub-carrier at frequency domain, is mapped to the 5th OFDM symbol in time domain.This dedicated pilot is more reasonable at previous other dedicated pilot mapping method that proposes of the original position design of time domain, and under the situation of same pilot expense, performance is more excellent.
(1) frequency domain original position.
The first row wave beam form descending special pilot frequency at frequency domain since second number of sub-carrier; Dedicated pilot is close to public guide frequency like this; Shown in Fig. 4 A; Wave beam forms weights to be estimated to obtain behind the real channel by the upstream or downstream public guide frequency, and the pilot tone that is used further to the adjacent position will be recovered channel information more accurately.
(2) time domain original position.Preceding 0～3 OFDM symbol of stipulating each RB in the existing version of LTE standard sends control information; And dedicated pilot is used to adopt the channel estimating of the data channel that wave beam forms; Therefore, on time domain, confirm in the embodiment of the invention to insert dedicated pilot from the 5th OFDM sign-on.When a plurality of RB send together; The first row dedicated pilot of last column dedicated pilot of previous RB and current RB is 5 OFDM symbols at interval; Can make that so neither common control information bumps; Owing to be close to dedicated pilot, therefore guaranteed the channel estimating performance of last column and the 4th OFDM symbol simultaneously.
In addition; Owing to also stipulate in the working hypothesis of wave beam formation descending special pilot frequency: require the Power Boosting (power amplification) on the whole bandwidth to be consistent; And need inform UE (UserEquipment; Subscriber equipment) ratio of Power Boosting; In view of being evenly distributed of control information and control information increase, there is not the possibility of control information to reduce greatly among the RB, the channel estimating performance loss that former 3 the OFDM symbolic distance dedicated pilots of institute far bring can obviously not influence systematic function.
(4) step S208
In this step, form dedicated pilot at two wave beams of same time domain mapping.
And; The frequency domain position that first wave beam that is mapped to M OFDM symbol in time domain forms dedicated pilot is set to: be located at the centre position of frequency domain position that time domain is mapped to a plurality of wave beams formation dedicated pilots of B OFDM symbol; Wherein, M=B+ time domain interval+1; That is to say; The frequency domain original position of the second row dedicated pilot is positioned at the centre of two dedicated pilots of first row; Help improving the performance of channel estimating interpolation like this, avoid the delegation of Resource Block or a row pilot symbol distribution overstocked, and other position pilot distribution are too sparse; Correlation between channels can not make full use of, the variation of channel can not be followed the tracks of immediately thereby cause, and reduces the problem of the quality of channel estimating greatly.
In addition, the frequency domain position that two wave beams that are mapped to N OFDM symbol in time domain form dedicated pilots is set to: be positioned at the identical position of frequency domain position with two wave beams formation dedicated pilots that are mapped to B OFDM symbol in time domain; Wherein, N=B+2* time domain interval+2; This is because after surpassing 5 OFDM, variation has taken place channel, can not utilize correlation between channels to carry out channel estimating again, need know the channel information on this carrier wave again.
Here, and since A=2, B=5, therefore, M=5+3+1=9, N=5+2*3+2=13.That is to say, in embodiments of the present invention, respectively wave beam is formed dedicated pilot and be mapped to the 5th, the 9th, the 13rd OFDM symbol in time domain.Simultaneously, shown in Figure 1A, the size of minimal physical Resource Block is that time domain comprises 14 OFDM symbols in the frame structure of normal cyclic prefix; Frequency domain comprises 12 number of sub-carrier; The two-way public guide frequency is distributed in the 1st row of minimal physical Resource Block, the 5th row, eighth row and the 12nd row
Based on foregoing, the operation of in step S208, carrying out the mapping treatment of other wave beams formation dedicated pilots is specially:
Second wave beam formed dedicated pilot be mapped to the 5th OFDM symbol, be mapped to the 8th (2+5+1=8) number of sub-carrier at frequency domain in time domain;
The 3rd wave beam formed dedicated pilot be mapped to the 9th OFDM symbol, be mapped to the 5th (2 and 8 centre position is 5) number of sub-carrier at frequency domain in time domain; The 4th wave beam formed dedicated pilot be mapped to the 9th OFDM symbol, be mapped to the 11 (5+5+1=11) number of sub-carrier at frequency domain in time domain;
The 5th wave beam formed dedicated pilot be mapped to the 13 OFDM symbol in time domain, frequency domain is mapped to second number of sub-carrier (frequency domain position that forms dedicated pilot with first wave beam is identical); The 6th wave beam formed dedicated pilot be mapped to the 13 OFDM symbol in time domain, frequency domain is mapped to the 8th number of sub-carrier (frequency domain position that forms dedicated pilot with second wave beam is identical).
Particularly, Fig. 4 A shows the mapping relations that the wave beam of realizing through said process forms dedicated pilot and Physical Resource Block.Can find out that through Fig. 4 A dedicated pilot is convenient to guarantee that at the original position next-door neighbour public guide frequency of frequency domain channel information extracts and the consistency of application site, reduces cumulative errors.
Method embodiment two
According to the embodiment of the invention; Provide a kind of wave beam to form the mapping method of dedicated pilot and Physical Resource Block; This method can be used for frame structure that long evolving system adopts long loop prefix (wherein; RB comprises 12 number of sub-carrier at frequency domain, comprises 12 OFDM symbols in time domain) in wave beam form the mapping of dedicated pilot and Physical Resource Block.
As shown in Figure 3, this method comprises following processing (step S302-step S304):
Step S302, frequency domain interval is provided with processing, forms dedicated pilot for the wave beam that is mapped to same time domain, and its frequency domain interval is set to 5 number of sub-carrier;
Step S304, time domain interval is provided with processing, forms dedicated pilot for the wave beam that is mapped to different time domain, and its time domain is set to 2 or 3 OFDM symbols;
Step S306, initial mapping processing forms dedicated pilot with first wave beam and is mapped to initial position, and wherein, initial position representes that with A and B wherein, A is a frequency domain initial position, and B is the time domain initial position;
Step S308, initial position, frequency domain interval and the time domain interval and the pre-defined rule that form dedicated pilot according to first wave beam carry out the mapping treatment that other wave beams form dedicated pilot.
Below will describe above-mentioned each item in detail handles.Wherein, for understanding and implement with reference to the description of preceding text method embodiment one, no longer be repeated in this description at this with method embodiment one same or analogous part.
(1) step S302, frequency domain interval is provided with processing
Description referring to the relevant step S202 of preceding text.
(2) step S304, time domain interval is provided with processing
Preferably, above-mentioned time domain interval is provided with to handle and is specially: at first time domain interval is set to 2 OFDM symbols, and wave beam is formed dedicated pilot be mapped to M OFDM symbol, wherein, M=B+2+1; Time domain interval is set to 3 OFDM symbols again, and wave beam is formed dedicated pilot be mapped to N OFDM symbol, wherein, N=B+2+3+2.
That is, in the frame structure of long loop prefix, the first row dedicated pilot and the second row dedicated pilot be two OFDM symbols at interval, and the second row dedicated pilot and the third line dedicated pilot be three OFDM symbols at interval.
(3) step S306, initial mapping processing
In this step, A is set to: after first public guide frequency on B the OFDM symbol, specifically referring to Fig. 4 B.
Preferably, A=2, B=4 promptly, forms dedicated pilot with first wave beam and is mapped to second number of sub-carrier at frequency domain, is mapped to the 4th OFDM symbol in time domain.
(1) frequency domain original position.
The first row wave beam form descending special pilot frequency at frequency domain since second number of sub-carrier; Dedicated pilot is close to public guide frequency like this; Shown in Fig. 4 B; Wave beam forms weights to be estimated to obtain behind the real channel by the upstream or downstream public guide frequency, and the pilot tone that is used further to the adjacent position will be recovered channel information more accurately.
(2) time domain original position.Preceding 0～3 OFDM symbol of stipulating each RB in the existing version of LTE standard sends control information; And dedicated pilot is used to adopt the channel estimating of the data channel that wave beam forms; Therefore, on time domain, confirm in the embodiment of the invention to insert dedicated pilot from the 4th OFDM sign-on.When a plurality of RB send together; The first row dedicated pilot of last column dedicated pilot of previous RB and current RB is 4 OFDM symbols at interval; Can make that so neither common control information bumps; Owing to be close to dedicated pilot, therefore guaranteed the channel estimating performance of last column and the 4th OFDM symbol simultaneously.
(4) step S308
In this step, form dedicated pilot at two wave beams of same time domain mapping.
And the frequency domain position that first wave beam that is mapped to the individual OFDM symbol of M (M=B+2+1) in time domain forms dedicated pilot is set to: be located at the centre position of frequency domain position that time domain is mapped to a plurality of wave beams formation dedicated pilots of B OFDM symbol;
The frequency domain position that is mapped to two wave beams formation dedicated pilots of the individual OFDM symbol of N (N=B+2+3+2) in time domain is set to: be positioned at the identical position of frequency domain position that forms dedicated pilots with two wave beams that are mapped to B OFDM symbol in time domain.
Here, and since A=2, B=4, therefore, M=4+2+1=7, N=4+2+3+2=11.That is to say, in embodiments of the present invention, respectively wave beam is formed dedicated pilot and be mapped to the 4th, the 7th, the 11st OFDM symbol in time domain.Simultaneously, shown in Figure 1B, the size of minimal physical Resource Block is that time domain comprises 12 OFDM symbols in the frame structure of long loop prefix; Frequency domain comprises 12 number of sub-carrier; The two-way public guide frequency is distributed in the 1st row of minimal physical Resource Block, the 4th row, the 7th row and the 10th row.
Based on foregoing, the operation of in step S308, carrying out the mapping treatment of other wave beams formation dedicated pilots is specially:
Second wave beam formed dedicated pilot be mapped to the 4th OFDM symbol, be mapped to the 8th (2+5+1=8) number of sub-carrier at frequency domain in time domain;
The 3rd wave beam formed dedicated pilot be mapped to the 7th OFDM symbol, be mapped to the 5th (2 and 8 centre position is 5) number of sub-carrier at frequency domain in time domain; The 4th wave beam formation dedicated pilot is mapped to the 7th OFDM symbol in time domain exists, frequency domain is mapped to the 11 (5+5+1=11) number of sub-carrier;
The 5th wave beam formed dedicated pilot be mapped to the 11 OFDM symbol, be mapped to second number of sub-carrier (frequency domain position that forms dedicated pilot with first wave beam is identical) at frequency domain in time domain; The 6th wave beam formed dedicated pilot be mapped to the 11 OFDM symbol, be mapped to the 8th number of sub-carrier (frequency domain position that forms dedicated pilot with second wave beam is identical) at frequency domain in time domain.
Particularly, Fig. 4 B shows the mapping relations that the wave beam of realizing through said process forms dedicated pilot and Physical Resource Block.Can find out that through Fig. 4 B dedicated pilot is convenient to guarantee that at the original position next-door neighbour public guide frequency of frequency domain channel information extracts and the consistency of application site, reduces cumulative errors.
Can find out from top description; In the present invention; Through frequency domain interval and time domain interval are set in advance; And confirm that first wave beam forms the position (frequency domain original position and time domain original position) of dedicated pilot, and, just can confirm the position of frequency pilot sign in Physical Resource Block according to pre-defined rule.
The single current wave beam that wave beam in the embodiment of the invention forms any antenna amount of descending special pilot frequency structural support and antenna distance forms.Wave beam forms dedicated pilot and distinguishes according to wave beam; What relate in embodiments of the present invention is that the wave beam of simple beam forms, so the dedicated pilot structure that embodiments of the invention provide comprises one road dedicated pilot, to those skilled in the art; Can be generalized to the situation of multi-beam according to corresponding pilot density; For example, two wave beams adopt the two-way dedicated pilot, by that analogy.
As stated; Through above-mentioned at least one technical scheme provided by the invention; Realized following beneficial effect: (1) is through the position of clear and definite frequency pilot sign in Physical Resource Block; Solved when base station end adopts wave beam greater than 4 antennas to form, public guide frequency can't obtain the problem of whole channel informations in the existing LTE standard version; (2) comprise the processing weights that real channel information and wave beam form through the channel information that dedicated pilot is obtained, make that UE need not to form emission value obtaining wave beam specially, thereby avoided wave beam to form the feedback overhead of weights; (3) in addition, dedicated pilot is more reasonable at the previous dedicated pilot mapping method that proposes of the original position design of time domain, and under the situation of same pilot expense, performance is more excellent; (4) because dedicated pilot is close to public guide frequency in the original position of frequency domain; Be convenient to guarantee that channel information extracts and the consistency of application site, reduce cumulative errors, further; (5), therefore guarantee the quality of channel estimating because dedicated pilot is very even in time domain and frequency domain distribution.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a wave beam forms the mapping method of dedicated pilot and Physical Resource Block; Be used for the mapping that the long evolving system wave beam forms dedicated pilot and Physical Resource Block; Wherein, Said Physical Resource Block comprises 12 number of sub-carrier at frequency domain, and comprising 14 OFDM symbols in time domain is the OFDM symbol;
It is characterized in that said method comprises:
Frequency domain interval is provided with processing, forms dedicated pilot for the wave beam that is mapped to same time domain, and its frequency domain interval is set to 5 number of sub-carrier;
Time domain interval is provided with processing, forms dedicated pilot for the wave beam that is mapped to different time domain, and its time domain is set to 3 OFDM symbols;
Initial mapping processing forms dedicated pilot with first wave beam and is mapped to initial position, and wherein, said initial position representes that with A and B wherein, A is a frequency domain initial position, and B is the time domain initial position;
Said initial position, said frequency domain interval and the said time domain interval and the pre-defined rule that form dedicated pilot according to said first wave beam carry out the mapping treatment that other wave beams form dedicated pilot.
2. method according to claim 1, in said initial mapping processing, A is set to: after first public guide frequency on B the OFDM symbol.
3. method according to claim 2 is characterized in that, said pre-defined rule is:
Form dedicated pilot at two wave beams of same time domain mapping;
The frequency domain position that first wave beam that is mapped to M OFDM symbol in time domain forms dedicated pilot is set to: be located at the centre position of frequency domain position that time domain is mapped to a plurality of wave beams formation dedicated pilots of B OFDM symbol; Wherein, M=B+ time domain interval+1;
The frequency domain position that is mapped to two wave beams formation dedicated pilots of N OFDM symbol in time domain is set to: be positioned at the identical position of frequency domain position that forms dedicated pilots with two wave beams that are mapped to B OFDM symbol in time domain; Wherein, N=B+2* time domain interval+2.
4. according to each described method in the claim 1 to 3, it is characterized in that A=2, B=5.
5. method according to claim 4 is characterized in that, the said operation of carrying out the mapping treatment of other wave beams formation dedicated pilots is specially:
Second wave beam formed dedicated pilot be mapped to the 5th OFDM symbol, be mapped to the 8th number of sub-carrier at frequency domain in time domain;
The 3rd wave beam formed dedicated pilot be mapped to the 9th OFDM symbol, be mapped to the 5th number of sub-carrier at frequency domain in time domain;
The 4th wave beam formed dedicated pilot be mapped to the 9th OFDM symbol, be mapped to the 11 number of sub-carrier at frequency domain in time domain;
The 5th wave beam formed dedicated pilot be mapped to the 13 OFDM symbol in time domain, frequency domain is mapped to second number of sub-carrier;
The 6th wave beam formed dedicated pilot be mapped to the 13 OFDM symbol in time domain, frequency domain is mapped to the 8th number of sub-carrier.
6. a wave beam forms the mapping method of dedicated pilot and Physical Resource Block; Be used for the mapping that the long evolving system wave beam forms dedicated pilot and Physical Resource Block; Wherein, said Physical Resource Block comprises 12 number of sub-carrier at frequency domain, comprises 12 OFDM symbols in time domain; It is characterized in that said method comprises:
Frequency domain interval is provided with processing, forms dedicated pilot for the wave beam that is mapped to same time domain, and its frequency domain interval is set to 5 number of sub-carrier;
Time domain interval is provided with processing, forms dedicated pilot for the wave beam that is mapped to different time domain, and its time domain is set to 2 or 3 OFDM symbols;
Initial mapping processing forms dedicated pilot with first wave beam and is mapped to initial position, and wherein, said initial position representes that with A and B wherein, A is a frequency domain initial position, and B is the time domain initial position;
Said initial position, said frequency domain interval and the said time domain interval and the pre-defined rule that form dedicated pilot according to said first wave beam carry out the mapping treatment that other wave beams form dedicated pilot.
7. method according to claim 6 is characterized in that, in said initial mapping processing, A is set to: after first public guide frequency on B the OFDM symbol.
8. method according to claim 7 is characterized in that, said time domain interval is provided with to handle and is specially:
At first time domain interval is set to 2 OFDM symbols, and wave beam is formed dedicated pilot be mapped to M OFDM symbol, wherein, M=B+2+1;
Time domain interval is set to 3 OFDM symbols again, and wave beam is formed dedicated pilot be mapped to N OFDM symbol, wherein, N=B+2+3+2.
9. method according to claim 7 is characterized in that, said pre-defined rule is:
Form dedicated pilot at two wave beams of same time domain mapping;
The frequency domain position that first wave beam that is mapped to M OFDM symbol in time domain forms dedicated pilot is set to: be located at the centre position of frequency domain position that time domain is mapped to a plurality of wave beams formation dedicated pilots of B OFDM symbol;
The frequency domain position that is mapped to two wave beams formation dedicated pilots of N OFDM symbol in time domain is set to: be positioned at the identical position of frequency domain position that forms dedicated pilots with two wave beams that are mapped to B OFDM symbol in time domain.
10. according to each described method in the claim 6 to 9, it is characterized in that A=2, B=4.
11. method according to claim 10 is characterized in that, the said operation of carrying out the mapping treatment of other wave beams formation dedicated pilots is specially:
Second wave beam formed dedicated pilot be mapped to the 4th OFDM symbol, be mapped to the 8th number of sub-carrier at frequency domain in time domain;
The 3rd wave beam formed dedicated pilot be mapped to the 7th OFDM symbol, be mapped to the 5th number of sub-carrier at frequency domain in time domain;
The 4th wave beam formation dedicated pilot is mapped to the 7th OFDM symbol in time domain exists, frequency domain is mapped to the 11 number of sub-carrier;
The 5th wave beam formed dedicated pilot be mapped to the 11 OFDM symbol, be mapped to second number of sub-carrier at frequency domain in time domain;
The 6th wave beam formed dedicated pilot be mapped to the 11 OFDM symbol, be mapped to the 8th number of sub-carrier at frequency domain in time domain.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2008/000101 WO2009089649A1 (en) | 2008-01-15 | 2008-01-15 | Mapping method for beam forming dedicated pilot and physical resource block |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101803320A CN101803320A (en) | 2010-08-11 |
| CN101803320B true CN101803320B (en) | 2012-10-03 |
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| CN200880107151XA Expired - Fee Related CN101803320B (en) | 2008-01-15 | 2008-01-15 | Mapping method for beam forming dedicated pilot and physical resource block |
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| Country | Link |
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| CN (1) | CN101803320B (en) |
| WO (1) | WO2009089649A1 (en) |
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| US10396873B2 (en) | 2014-09-24 | 2019-08-27 | Mediatek Inc. | Control signaling in a beamforming system |
| US9882620B2 (en) | 2014-09-24 | 2018-01-30 | Mediatek Inc. | Synchronization in a beamforming system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1455473A (en) * | 2002-04-30 | 2003-11-12 | Lg电子株式会社 | Self-adaptive beam-formation apparatus and method |
| CN1889554A (en) * | 2005-06-27 | 2007-01-03 | 华为技术有限公司 | Pilot frequency transfer method |
| CN1980114A (en) * | 2005-11-30 | 2007-06-13 | 中国科学院上海微系统与信息技术研究所 | Channel estimation emitting-receiving device and method |
-
2008
- 2008-01-15 WO PCT/CN2008/000101 patent/WO2009089649A1/en active Application Filing
- 2008-01-15 CN CN200880107151XA patent/CN101803320B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1455473A (en) * | 2002-04-30 | 2003-11-12 | Lg电子株式会社 | Self-adaptive beam-formation apparatus and method |
| CN1889554A (en) * | 2005-06-27 | 2007-01-03 | 华为技术有限公司 | Pilot frequency transfer method |
| CN1980114A (en) * | 2005-11-30 | 2007-06-13 | 中国科学院上海微系统与信息技术研究所 | Channel estimation emitting-receiving device and method |
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| CN101803320A (en) | 2010-08-11 |
| WO2009089649A1 (en) | 2009-07-23 |
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