CN101841355B - Demodulation pilot frequency mapping processing method and device - Google Patents

Abstract

The invention discloses a demodulation pilot frequency mapping processing method, comprising the following steps: carry out grouping to the condition of various available layer number of an information channel, and set pilot frequency mapping modes to all groups according to different pilot frequency density overheads; obtain the available layer number of the information channel according to the information of the information channel, determine the information of subsidiary group of the available layer number of the information channel and obtain the pilot frequency mapping mode corresponding to the subsidiary group; insert demodulation pilot frequency of each layer according to the pilot frequency mapping mode corresponding to the subsidiary group; carry out precoding to demodulation pilot frequency and data on each layer by adopting same precoding matrix according to the information of the information channel fed back by users, and carry out sending in different antennas. The invention further discloses a demodulation pilot frequency mapping processing device which realizes mapping processing of pilot frequency for data demodulation and a physical resource block, can be well compatible with long-term evolution (LTE) terminal and can reduce the overhead of the pilot frequency.

Description

The processing method of demodulation pilot frequency mapping and device

Technical field

The present invention relates to the demodulation pilot frequency technology in radio communication, relate in particular to a kind of processing method and device of demodulation pilot frequency mapping.

Background technology

The high-order multi-antenna technology is one of key technology of senior Long Term Evolution (LTE-Advanced, Long-Term EvolutionAdvance) system, in order to improve the system transmission rate.In order to realize introducing channel quality measurement and the data demodulates after the high-order multi-antenna technology, the LTE-Advanced system has defined respectively data demodulates pilot tone and channel quality measurement pilot tone.Wherein, the design of demodulation pilot frequency need be followed following principle:

A, demodulation pilot frequency are that terminal is proprietary, i.e. UE-specific, and only at the Resource Block (RB, Resource Block) of scheduling with corresponding layer is upper transmits;

B, demodulation pilot frequency are the expansion of pilot tone on a plurality of transport layers of antenna port 5 in long evolving system the 8th version (LTE R8);

Demodulation pilot frequency on c, different transport layer is orthogonal;

Demodulation pilot frequency on d, each transport layer and the same pre-coding matrix of the data.

In prior art, take antenna port 5 dedicated pilot as the basis, for normal cyclic prefix (NormalCP, Normal Cyclic Prefix) data, the pilot tone R of antenna port 5 ₅as shown in Figure 1.For extended cyclic prefix (Extended CP, Extended Cyclic Prefix) data, the pilot tone R of antenna port 5 ₅as shown in Figure 2.

Yet, no matter be the demodulation pilot frequency for the normal cyclic prefix data, or the demodulation pilot frequency of extended cyclic prefix data, prior art all also can't solve the problem of its resource mapping, thereby makes troubles to practical application; In addition, in LTE, existing pilot frequency system can not well be taken into account the balance of pilot-frequency expense and precision of channel estimation, makes pilot-frequency expense excessive.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of processing method and device of demodulation pilot frequency mapping, to realize for the pilot tone of data demodulates and the mapping processing of Physical Resource Block.

For achieving the above object, technical scheme of the present invention is achieved in that

The invention provides a kind of processing method of demodulation pilot frequency mapping, the method comprises:

Various available layers number situations to channel are divided into groups, and each group is arranged to the pilot tone mapping mode according to different pilot density expenses;

Obtain the available layers number of channel according to channel information, determine the information of organizing under the available layers number of described channel, pilot tone mapping mode corresponding to group under obtaining;

Insert the demodulation pilot frequency of each layer according to affiliated group of corresponding pilot tone mapping mode;

According to the channel information of user feedback, the demodulation pilot frequency on each layer and the identical pre-coding matrix of the data are carried out to precoding, and sent in different antennae.

Data burst for normal cyclic prefix, described pilot tone takies the 4th, 7 OFDM symbols of even number time slot and the 3rd, 6 OFDM symbols of odd number time slot in time domain, and can further expand the 6th OFDM symbol taking the even number time slot and the 4th or 7 OFDM symbols of odd number time slot.

Data burst for extended cyclic prefix, described pilot tone takies the 5th OFDM symbol of even number time slot and the 2nd, 5 OFDM symbols of odd number time slot in time domain, and can further expand the 6th OFDM symbol taking the even number time slot and the 6th OFDM symbol of odd number time slot.

The position of described pilot tone on frequency domain determined according to following formula:

(um '+v _shift) modN _sC ^rB+ N _sC ^rBn _pRB, or [um '+(k+v _shift) modu] modN _sC ^rB+ N _sC ^rBn _pRB; And the frequency domain position of different layers is mutually orthogonal;

Wherein, $m^{\′}=\mathrm{0,1},...,\frac{N_{\mathrm{SC}}^{\mathrm{RB}}}{u}{N}_{\mathrm{RB}}^{\mathrm{PDSCH}}-1,$ Mean user terminal UE specific pilot signal Resource Unit counter in each OFDM symbol; v _shiftmean the specific frequency shift (FS) in community, v _shiftvalue can be for fixed constant or $v_{\mathrm{shift}}=N_{\mathrm{ID}}^{\mathrm{cell}}\mathrm{mod}u,$ N _iD ^cellmean cell identifier; N _rB ^pDSCHwhile meaning physical down link sharing channel PDSCH transmission, the bandwidth meaned with Resource Block RB number; N _sC ^rBthe frequency domain size of the RB that expression means with the subcarrier number; n _pRBmean the index of RB at frequency domain; U means pilot density, and for adjusting the pilot tone number of each OFDM symbol on a RB frequency domain direction, u is more than or equal to 1 positive integer; K means the relative displacement of the corresponding pilot tone of different layers.

When the available layers number of channel is 1, the UE-specific pilot tone pattern of continuing to use LTE 3GPP 36.211 definition according to DMRS arranges the pilot tone mapping mode.

When maximum supporting layer number is 4, according to { 1}, { 2}, { when 3,4} is divided into groups, for set, { 2} is with { 3,4} arranges respectively the pilot tone mapping mode according to different pilot densities.

When maximum supporting layer number is 4, and according to { 1}, { when 2,3,4} is divided into groups, for set, { 2,3,4} independently arranges the pilot tone mapping mode according to pilot density.

When maximum supporting layer number is 8, according to { 1}, { 2}, { 3,4}, { when 5,6,7,8} is divided into groups, for set, { 2}, { 3,4}, { 5,6,7,8} arranges respectively the pilot tone mapping mode according to different pilot densities.

When maximum supporting layer number is 8, according to { 1}, { 2,3,4}, { when 5,6,7,8} is divided into groups, for set, { 2,3,4}, { 5,6,7,8} arranges respectively the pilot tone mapping mode according to different pilot densities.

When maximum supporting layer number is 8, and according to { 1}, { when 2,3,4,5,6,7,8} is divided into groups, for set, { 2,3,4,5,6,7,8} independently arranges the pilot tone mapping mode according to pilot density.

When maximum supporting layer number is K, K is greater than 1 positive integer, and according to 1}, and 2}, 3}, 4} ... { when K} is divided into groups, independently for each set, according to pilot density, different pilot tone mapping modes is set respectively.

When number of layers belong to set during 2}, corresponding pilot tone mapping mode is specially:

For the data burst of normal cyclic prefix, in time domain, layer 0 is mapped on the 3rd OFDM symbol of the 4th OFDM symbol of even number time slot and odd number time slot, and determines according to u=3 or u=4 in the density distribution of frequency domain; Layer 1 is mapped on the 6th OFDM symbol of the 7th OFDM symbol of even number time slot and odd number time slot, and determines according to u=3 or u=4 in the density distribution of frequency domain;

Perhaps for the data burst of extended cyclic prefix, in time domain, layer 0 and layer 1 are mapped on the 2nd, 5 OFDM symbols of the 5th OFDM symbol of even number time slot and odd number time slot, and the frequency domain density of layer 0 and layer 1 is determined according to u=2 or u=3.

When number of layers belong to set 2,3,4} or set 3,4} or 2,3,4,5,6,7,8} or during 4}, corresponding pilot tone mapping mode is specially:

Data burst for normal cyclic prefix, in time domain, layer 0 and layer 1 are mapped on the 3rd OFDM symbol of the 4th OFDM symbol of even number time slot and odd number time slot, and layer 2 and layer 3 are mapped on the 6th OFDM symbol of the 7th OFDM symbol of even number time slot and odd number time slot; At frequency domain, the u=6 of every layer of correspondence or u=4;

Perhaps, for the data burst of extended cyclic prefix, in time domain, layer 0, layer 1, layer 2 and layer 3 are mapped in the 5th OFDM symbol of even number time slot, and on the 2nd, 5 OFDM symbols of odd number time slot; The u=12 of each layer of correspondence or u=6.

When number of layers belong to set 2,3,4} or the set 3,4} or 2,3,4,5,6,7,8} or during 4}, the pilot tone mapping mode of corresponding normal cyclic prefix is specially:

In time domain, layer 0 is mapped on the 3rd OFDM symbol of the 4th OFDM symbol of even number time slot and odd number time slot, layer 1 is mapped on the 6th OFDM symbol of the 7th OFDM symbol of even number time slot and odd number time slot, and layer 2 and layer 3 are mapped on the 7th OFDM symbol of the 6th OFDM symbol of even number time slot and odd number time slot;

Layer 0 and layer 1 position distribution on frequency domain determine according to u=4 or u=3, on the 6th OFDM symbol of even number time slot and on the 7th OFDM symbol of odd number time slot, and u=4 or the u=6 of layer 2 and layer 3 correspondence.

When number of layers belong to set 2,3,4,5,6,7,8} or 5,6,7,8} or during 8}, corresponding pilot tone mapping mode is specially:

For the data burst of normal cyclic prefix, in time domain, layer 0, layer 1 is mapped to the 4th OFDM symbol of even number time slot and the 3rd OFDM symbol of odd number time slot; Layer 2 and layer 3 are mapped to the 7th OFDM symbol of even number time slot and the 6th OFDM symbol of odd number time slot; Layer 4, layer 5, layer 6 and layer 7 are mapped on the 4th OFDM symbol of the 6th OFDM symbol of even number time slot and odd number time slot; At frequency domain, layer 0, layer 1, layer 2, u=6 or the u=4 of layer 3 correspondence, layer 4, layer 5, u=6 or the u=12 of layer 6 and layer 7 correspondence;

Perhaps for the data burst of extended cyclic prefix, in time domain, layer 0, layer 1, layer 2, layer 3 is mapped to the 5th OFDM symbol of even number time slot and the 5th OFDM symbol of odd number time slot; R ₄, R ₅, R ₆and R ₇be mapped on the 6th OFDM symbol of the 6th OFDM symbol of even number time slot and odd number time slot, at frequency domain, layer 0, layer 1, the u=6 of layer 2 and layer 3 correspondence, u=6 or the u=12 of layer 4, layer 5, layer 6 and layer 7 correspondence.

The present invention also provides a kind of processing unit of demodulation pilot frequency mapping, and this device comprises:

The pilot settings module, divided into groups for the various available layers number situations to channel, and each group arranged to the pilot tone mapping mode according to different pilot density expenses;

The mapping mode acquisition module, for obtain the available layers number of channel according to channel information, determine the information of organizing under the available layers number of channel, pilot tone mapping mode corresponding to group under obtaining;

The pilots insertion module, for inserting the demodulation pilot frequency of each layer according to affiliated group of corresponding pilot tone mapping mode;

Precoding module, for the channel information according to user feedback, carry out precoding to the demodulation pilot frequency on each layer and the identical pre-coding matrix of the data, and sent in different antennae.

The processing method of a kind of demodulation pilot frequency mapping provided by the present invention and device, independently arrange the pilot tone mapping mode by the available layers number to channel in different situation, terminal that can well compatible LTE; For the LTE-A terminal of using high-order antenna, its application scenarios is mainly for low speed user, therefore at the available layers number of channel while being a plurality of, can continue to maintain the pilot density of antenna port 5 in LTE, can independently according to application scenarios, the pilot tone mapping mode be set flexibly, and then well take into account the balance of pilot-frequency expense and precision of channel estimation, and reduced pilot-frequency expense.

The accompanying drawing explanation

The pilot tone mapping schematic diagram of the demodulation pilot frequency that Fig. 1 is normal cyclic prefix in prior art in RB;

The pilot tone mapping schematic diagram of the demodulation pilot frequency that Fig. 2 is extended cyclic prefix in prior art in RB;

The flow chart of the processing method that Fig. 3 is a kind of demodulation pilot frequency mapping of the present invention;

The resource mapping schematic diagram of the demodulation pilot frequency that Fig. 4 is the embodiment of the present invention one;

The resource mapping schematic diagram of the demodulation pilot frequency that Fig. 5 is the embodiment of the present invention two;

The resource mapping schematic diagram of the demodulation pilot frequency that Fig. 6 is the embodiment of the present invention three;

The resource mapping schematic diagram of the demodulation pilot frequency that Fig. 7 is the embodiment of the present invention four;

The resource mapping schematic diagram of the demodulation pilot frequency that Fig. 8 is the embodiment of the present invention five;

The resource mapping schematic diagram of the demodulation pilot frequency that Fig. 9 is the embodiment of the present invention six;

The resource mapping schematic diagram of the demodulation pilot frequency that Figure 10 is the embodiment of the present invention seven;

The composition structural representation of the processing unit that Figure 11 is a kind of demodulation pilot frequency mapping of the present invention.

Embodiment

Below in conjunction with the drawings and specific embodiments, the technical solution of the present invention is further elaborated.

The processing method of a kind of demodulation pilot frequency mapping provided by the present invention as shown in Figure 3, mainly comprises the following steps:

Step 301, divided into groups to the various available layers number situations of channel, and each group arranged to the pilot tone mapping mode according to different pilot density expenses.

Wherein, when number of layers is 1, continue to use the pilot tone mapping mode of the UE-specific of antenna port 5 correspondences in LTE.For other groupings, new pilot tone mapping mode independently is set respectively.For example, when maximum supporting layer number is 4, and according to 1}, { 2}, { when 3,4} is divided into groups, arrange respectively corresponding to { 2} and { the pilot tone mapping mode of 3,4} set; When maximum supporting layer number is 4, and according to { 1}, { when 2,3,4} is divided into groups, arrange corresponding to { the pilot tone mapping mode of 2,3,4} set; When maximum supporting layer number is 8, and according to 1}, and 2,3,4}, { when 5,6,7,8} is divided into groups, { 2,3,4} is with { 5,6,7,8} gathers corresponding pilot tone mapping mode in setting respectively; When the number of layers of maximum support is K (K is greater than 1 positive integer), and according to 1}, and 2}, 3}, 4} ... { when K} is divided into groups, independently for each set, different pilot tone mapping modes is set.Packet mode in practical application also has a lot, at this, will not enumerate.

In addition, the time-domain position of pilot tone is continued to use the time-domain position of UE specific (UE-specific) reference symbol of definition in third generation partner program (3GPP, 3rd GenerationPartnership Project) 36.211, and can be expanded.Data burst for normal cyclic prefix, pilot tone is mapped in the 4th, 7 OFDM symbols of even number time slot and the 3rd, 6 OFDM symbols of odd number time slot in time domain, when needs are expanded, can expand to the 6th OFDM symbol of even number time slot and the 4th or 7 OFDM symbols of odd number time slot; Data for extended cyclic prefix, pilot tone is mapped in the 5th OFDM symbol of even number time slot and the 2nd, 5 OFDM symbols of odd number time slot in time domain, when needs are expanded, can expand to the 6th OFDM symbol of even number time slot and the 6th OFDM symbol of odd number time slot.

And, on different OFDM symbols, the frequency domain position of each layer can obtain by following formula:

(um′+v _shift)modN _SC ^RB+N _SC ^RB·n _PRB (1)

Perhaps [um '+(k+v _shift) modu] modN _sC ^rB+ N _sC ^rBn _pRB(2)

Wherein, $m^{\′}=\mathrm{0,1},...,\frac{N_{\mathrm{SC}}^{\mathrm{RB}}}{u}{N}_{\mathrm{RB}}^{\mathrm{PDSCH}}-1,$ For UE specific pilot signal Resource Unit counter in each OFDM symbol; v _shiftfor the specific frequency shift (FS) in community, its value can be for fixed constant or $v_{\mathrm{shift}}=N_{\mathrm{ID}}^{\mathrm{cell}}\mathrm{mod}u,$ N _iD ^cellfor cell identifier (ID, Identity); N _rB ^pDSCHwhile meaning physical down link sharing channel (PDSCH, Physical Downlink Shared Channel) transmission, the bandwidth meaned with the RB number; N _sC ^rBfrequency domain size for the RB that means with the subcarrier number; n _pRBmean the index of RB at frequency domain.U factor is for adjusting the pilot tone number of each OFDM symbol on a RB frequency domain direction, and it is to be more than or equal to 1 positive integer; K is relative displacement; In above formula, N _sC ^rBn _pRBfor determining carrier wave original position corresponding to current RB; Um '+v _shiftthe position of the pilot tone of correspondence mappings in current RB, for fear of um '+v _shiftthe carrier number that exceeds a RB, to N _sC ^rBcarry out delivery, thus the skew for (um '+v _shift) modN _sC ^rB.

Step 302, according to the available layers number of channel information acquisition channel, determine the information of organizing under the available layers number of channel, under obtaining, organizes corresponding pilot tone mapping mode.

For example: the situation that is 8 for maximum supporting layer number, and according to { 1}, { 2,3,4}, { 5, when 6,7,8} is divided into groups, if according to the channel information of user feedback, or utilize the channel information of the reciprocity acquisition of channel to know that channel can be used k=3 layer to carry out the transmission of data, by k and each set are compared, can determine that number of layers now belongs to set { 2,3,4}, and then can obtain in step 301 as gathering { the pilot tone mapping mode that 2,3,4} arranges.

Step 303, insert the demodulation pilot frequency of each layer according to affiliated group of corresponding pilot tone mapping mode.

Subsequent steps 302 for example, the data transmit-receive both sides obtain set, and { under pilot tone mapping mode corresponding to 2,3,4}, after the positional information of 1～k layer pilot tone, according to these positional informations, transmit leg inserts respectively the demodulation pilot frequency of 1～k layer in RB.

Step 304, according to the channel information of user feedback, transmit leg carries out precoding to the demodulation pilot frequency on each layer and the identical pre-coding matrix of the data, and is sent in different antennae.

Below in step 301 according to the grouping situation of various available layers numbers, the concrete operations that the pilot tone mapping mode is set are described in detail.

When maximum supporting layer number is 4, and according to { 1}, { 2}, { when 3,4} is divided into groups, for set, { the pilot tone mapping mode that 2} arranges as shown in Figure 4 and Figure 5.

For the data burst of normal cyclic prefix, in time domain, the pilot tone R of layer 0 ₀be mapped on the 3rd OFDM symbol of the 4th OFDM symbol of even number time slot and odd number time slot, and determine according to u=3 or u=4 in the density distribution of frequency domain; The pilot tone R of layer 1 ₁be mapped on the 6th OFDM symbol of the 7th OFDM symbol of even number time slot and odd number time slot, and determine according to u=3 or u=4 in the density distribution of frequency domain.As shown in Figure 4, R ₀and R ₁in the OFDM symbol of mapping, the frequency domain position of pilot tone obtains according to above-mentioned formula (2), and corresponding R ₀the u value be that 3, k value is 1, corresponding R ₁the u value be that 3, k value is 2.

For the data of extended cyclic prefix, R ₀and R ₁be mapped to the 5th OFDM symbol of even number time slot, and on the 2nd, 5 OFDM symbols of odd number time slot, and R ₀and R ₁density distribution at frequency domain is determined according to u=2 or u=3.As shown in Figure 5, according to above-mentioned formula (2), and the u value is 2; On same OFDM symbol, R ₀and R ₁quadrature, get different k values.On the 5th OFDM symbol of the 5th OFDM symbol of even number time slot and odd number time slot, R ₀corresponding k value is 4, R ₁corresponding k value is 1; On the 2nd OFDM symbol of odd number time slot, R ₀corresponding k value is 1, R ₁corresponding k value is 4.

When maximum supporting layer number is 4, and according to 1}, { 2} { when 3,4} is divided into groups, is set { the pilot tone mapping mode that 3,4} arranges; Perhaps according to { 1} { when 2,3,4} is divided into groups, is set { the pilot tone mapping mode that 2,3,4} arranges; Perhaps when maximum supporting layer number be 8, and according to 1}, 2,3,4}, when 5,6,7,8} is divided into groups, for set the pilot tone mapping mode that 2,3,4} arranges, or during other groupings for set the pilot tone mapping mode that 4} arranges, as shown in Figure 6 and Figure 7.

For the data burst of normal cyclic prefix, at time domain R ₀and R ₁be mapped on the 3rd OFDM symbol of the 4th OFDM symbol of even number time slot and odd number time slot; The pilot tone R of layer 2 ₂pilot tone R with layer 3 ₃be mapped on the 6th OFDM symbol of the 7th OFDM symbol of even number time slot and odd number time slot; At frequency domain, the u=6 of every layer of correspondence or u=4.According to above-mentioned formula (1) or (2), the density on each layer is 2 Resource Units/OFDM symbol, on the 4th OFDM symbol of even number time slot, and R ₀and R ₁corresponding k value is respectively 0 and 3; On the 3rd OFDM symbol of odd number time slot, R ₀and R ₁corresponding k value is respectively 3 and 0; On the 7th OFDM symbol of even number time slot, R ₂and R ₃corresponding k value is respectively 0 and 3; On the 6th OFDM symbol of odd number time slot, R ₂and R ₃corresponding k value is respectively 3 and 0.

For the data of extended cyclic prefix, in time domain, R ₀, R ₁, R ₂and R ₃be mapped on the OFDM symbol of antenna port 5 correspondences of LTE definition, i.e. R ₀, R ₁, R ₂and R ₃be mapped to the 5th OFDM symbol of even number time slot, and on the 2nd and 5 OFDM symbols of odd number time slot; The u=12 of each layer of correspondence or u=6.According to above-mentioned formula (1) or (2), on each layer density be 1 Resource Unit/OFDM symbol, on the 5th OFDM symbol of even number time slot, R ₀, R ₁, R ₂and R ₃corresponding k value difference 9,6,0,3; On the 2nd OFDM symbol of odd number time slot, R ₀, R ₁, R ₂and R ₃corresponding k value difference 6,0,3,9; On the 5th OFDM symbol of odd number time slot, R ₀, R ₁, R ₂and R ₃corresponding k value difference 0,6,9,3.

When maximum supporting layer number is 4, and according to 1}, { 2} { when 3,4} is divided into groups, is set { the pilot tone mapping mode that 3,4} arranges; Or according to { 1} { when 2,3,4} is divided into groups, is set { the pilot tone mapping mode that 2,3,4} arranges; Or according to { 1} { when 2,3,4,5,6,7,8} is divided into groups, is set { the pilot tone mapping mode that 2,3,4,5,6,7,8} arranges; Or other whens grouping for set the pilot tone mapping mode that 4} arranges, for the data burst of normal cyclic prefix, can also be as shown in Figure 8.

In time domain, R ₀be mapped on the 3rd OFDM symbol of the 4th OFDM symbol of even number time slot and odd number time slot; R ₁be mapped on the 6th OFDM symbol of the 7th OFDM symbol of even number time slot and odd number time slot; R ₂and R ₃be mapped on the 7th OFDM symbol of the 6th OFDM symbol of even number time slot and odd number time slot.R ₀and R ₁position distribution on frequency domain determines according to u=4 or u=3, on the 6th OFDM symbol of even number time slot and on the 7th OFDM symbol of odd number time slot, and R ₂and R ₃position distribution on frequency domain is determined according to u=4 or u=6.

At frequency domain, carry out the mapping of frequency domain position according to above-mentioned formula (1) or (2), at the 4th and 7 OFDM symbols of even number time slot, and on the 3rd and 6 OFDM symbols of odd number time slot, according to formula (1), shone upon, wherein the u value is 3 or 4.The mapping mode that the u value is 4 as shown in Figure 8.On the 7th OFDM symbol of the 6th OFDM symbol of even number time slot and odd number time slot, according to formula (2), shone upon, wherein the u value is 2.On the 6th OFDM symbol of even number time slot, R ₂and R ₃corresponding k value is respectively 3 and 0, on the 7th OFDM symbol of odd number time slot, and R ₂and R ₃corresponding k value is respectively 3 and 0.

When maximum supporting layer number is 8, and according to 1}, { 2,3,4} { when 5,6,7,8} is divided into groups, is set { the pilot tone mapping mode that 5,6,7,8} arranges; Perhaps according to 1}, and when 2,3,4,5,6,7,8} is divided into groups, for set the pilot tone mapping mode that 2,3,4,5,6,7,8} arranges, or according to other be grouped into set the pilot tone mapping mode of 8} setting, as shown in Figure 9 and Figure 10.

For the data burst of normal cyclic prefix, R ₀and R ₁be mapped to the 4th OFDM symbol of even number time slot and the 3rd OFDM symbol of odd number time slot; R ₂and R ₃be mapped to the 7th OFDM symbol of even number time slot and the 6th OFDM symbol of odd number time slot.The pilot tone R of layer 4 ₄, layer 5 pilot tone R ₅, layer 6 pilot tone R ₆pilot tone R with layer 7 ₇be mapped on the 4th OFDM symbol of the 6th OFDM symbol of even number time slot and odd number time slot; At frequency domain, R ₀, R ₁, R ₂and R ₃corresponding u=6 or u=4, R ₄, R ₅, R ₆and R ₇corresponding u=6 or u=12.At frequency domain, R ₄, R ₅, R ₆and R ₇position according to formula (2), obtain, and the u value is 1; On the 6th OFDM symbol of even number time slot, R ₄, R ₅, R ₆and R ₇corresponding k value is respectively 9,6,3,0; On the 4th OFDM symbol of odd number time slot, R ₄, R ₅, R ₆and R ₇corresponding k value is respectively 0,3,6,9.

For the data of extended cyclic prefix, R ₀, R ₁, R ₂and R ₃be mapped to the 5th OFDM symbol of even number time slot and the 5th OFDM symbol of odd number time slot; R ₄, R ₅, R ₆and R ₇be mapped on the 6th OFDM symbol of the 6th OFDM symbol of even number time slot and odd number time slot.At frequency domain, R ₀, R ₁, R ₂and R ₃corresponding u=6, R ₄, R ₅, R ₆and R ₇corresponding u=6 or u=12.

At frequency domain, R ₄, R ₅, R ₆and R ₇position according to formula (2), obtain, and the u value is 1; On the 6th OFDM symbol of even number time slot, R ₄, R ₅, R ₆and R ₇corresponding k value is respectively 9,6,3,0; On the 6th OFDM symbol of odd number time slot, R ₄, R ₅, R ₆and R ₇corresponding k value is respectively 0,3,6,9.

Below, with the data instance of normal cyclic prefix, further the processing method of the demodulation pilot frequency mapping shown in Fig. 3 is set forth.Suppose that maximum supporting layer number is 8, according to { 1}, { 2,3,4}, { 5,6,7,8} is divided into groups, and { as shown in Figure 1, correspondence gathers { 2,3 to the pilot tone mapping mode of 1} according to grouping, corresponding set to be set, as shown in Figure 6, correspondence gathers { 5,6 to the pilot tone mapping mode of 4}, the pilot tone mapping mode of 7,8} as shown in Figure 9.According to the channel information of user feedback, when available channel layer number k=3 ∈ { during 2,3,4}, inserts the demodulation pilot frequency of 1～3 layer of correspondence according to the pilot tone mapping mode shown in Fig. 6; When k=5 ∈ { during 5,6,7,8}, inserts the demodulation pilot frequency of 1～5 layer of correspondence according to the pilot tone mapping mode shown in Fig. 9.Then, the demodulation pilot frequency on each layer and the identical pre-coding matrix of the data are carried out to precoding, and sent in different antennae.

With the data instance of extended cyclic prefix, further the processing method of the demodulation pilot frequency mapping shown in Fig. 3 is set forth again.Suppose that maximum supporting layer number is 8, according to { 1}, { 2,3,4}, { 5,6,7,8} is divided into groups, and { as shown in Figure 2, correspondence gathers { 2,3 to the pilot tone mapping mode of 1} according to grouping, corresponding set to be set, as shown in Figure 7, correspondence gathers { 5,6 to the pilot tone mapping mode of 4}, the pilot tone mapping mode of 7,8} as shown in figure 10.According to the channel information of user feedback, when available channel layer number k=3 ∈ { during 2,3,4}, inserts the demodulation pilot frequency of 1～3 layer of correspondence according to the pilot tone mapping mode shown in Fig. 7; When k=5 ∈ { during 5,6,7,8}, inserts the demodulation pilot frequency of 1～5 layer of correspondence according to the pilot tone mapping mode shown in Figure 10.Then, the demodulation pilot frequency on each layer and the identical pre-coding matrix of the data are carried out to precoding, and sent in different antennae.

For realizing the processing method of the invention described above demodulation pilot frequency mapping, the present invention also provides a kind of processing unit of demodulation pilot frequency mapping, as shown in figure 11, this device comprises: pilot settings module 10, mapping mode acquisition module 20, pilots insertion module 30 and precoding module 40.Wherein, pilot settings module 10, divided into groups for the various available layers number situations to channel, and each group arranged to the pilot tone mapping mode according to different pilot density expenses.Mapping mode acquisition module 20, connect pilot settings module 10, for obtain the available layers number of channel according to channel information, determines the information of organizing under the available layers number of channel, pilot tone mapping mode corresponding to group under obtaining.Pilots insertion module 30, connect mapping mode acquisition module 20, for insert the demodulation pilot frequency of each layer according to affiliated group of corresponding pilot tone mapping mode.Precoding module 40, connect pilots insertion module 30, for the channel information according to user feedback, the demodulation pilot frequency on each layer and the identical pre-coding matrix of the data carried out to precoding, and sent in different antennae.

The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.

Claims (16)

1. the processing method of a demodulation pilot frequency mapping, is characterized in that, the method comprises:

Various available layers number situations to channel are divided into groups, and each group is arranged to the pilot tone mapping mode according to different pilot density expenses;

Obtain the available layers number of channel according to channel information, determine the information of organizing under the available layers number of described channel, pilot tone mapping mode corresponding to group under obtaining;

Insert the demodulation pilot frequency of each layer according to affiliated group of corresponding pilot tone mapping mode;

According to the channel information of user feedback, the demodulation pilot frequency on each layer and the identical pre-coding matrix of the data are carried out to precoding, and sent in different antennae.

2. the processing method of demodulation pilot frequency mapping according to claim 1, it is characterized in that, data burst for normal cyclic prefix, described pilot tone takies the 4th, 7 OFDM symbols of even number time slot and the 3rd, 6 OFDM symbols of odd number time slot in time domain, or further expands the 6th OFDM symbol taking the even number time slot and the 4th or 7 OFDM symbols of odd number time slot.

3. the processing method of demodulation pilot frequency mapping according to claim 1, it is characterized in that, data burst for extended cyclic prefix, described pilot tone takies the 5th OFDM symbol of even number time slot and the 2nd, 5 OFDM symbols of odd number time slot in time domain, or further expands the 6th OFDM symbol taking the even number time slot and the 6th OFDM symbol of odd number time slot.

4. according to the processing method of claim 2 or 3 described demodulation pilot frequency mapping, it is characterized in that, the position of described pilot tone on frequency domain determined according to following formula:

$({\mathrm{um}}^{\′}+v_{\mathrm{shift}})\mathrm{mod}{N}_{\mathrm{SC}}^{\mathrm{RB}}+N_{\mathrm{SC}}^{\mathrm{RB}}\·n_{\mathrm{PRB}},$ Perhaps $[{\mathrm{um}}^{\′}+(k+v_{\mathrm{shift}})\mathrm{mod}u]\mathrm{mod}{N}_{\mathrm{SC}}^{\mathrm{RB}}+N_{\mathrm{SC}}^{\mathrm{RB}}\·n_{\mathrm{PRB}};$ And the frequency domain position of different layers is mutually orthogonal;

Wherein, mean user terminal UE specific pilot signal Resource Unit counter in each OFDM symbol; v _shiftmean the specific frequency shift (FS) in community, v _shiftvalue be fixed constant or mean cell identifier;

while meaning physical down link sharing channel PDSCH transmission, the bandwidth meaned with Resource Block RB number;

the frequency domain size of the RB that expression means with the subcarrier number; n _pRBmean the index of RB at frequency domain; U means pilot density, and for adjusting the pilot tone number of each OFDM symbol on a RB frequency domain direction, u is more than or equal to 1 positive integer; K means the relative displacement of the corresponding pilot tone of different layers.

5. the processing method of demodulation pilot frequency mapping according to claim 1, is characterized in that, when the available layers number of channel is 1, the UE-specific pilot tone pattern of continuing to use the LTE3GPP36.211 definition according to DMRS arranges the pilot tone mapping mode.

6. the processing method of demodulation pilot frequency mapping according to claim 1, is characterized in that, when maximum supporting layer number is 4, according to { 1}, { 2} { when 3,4} is divided into groups, is set { 2} and { 3,4} arranges respectively the pilot tone mapping mode according to different pilot densities.

7. the processing method of demodulation pilot frequency mapping according to claim 1, is characterized in that, when maximum supporting layer number is 4, and according to { 1}, { when 2,3,4} is divided into groups, for set, { 2,3,4} independently arranges the pilot tone mapping mode according to pilot density.

8. the processing method of demodulation pilot frequency mapping according to claim 1, is characterized in that, when maximum supporting layer number is 8, according to { 1}, { 2}, { 3,4} { when 5,6,7,8} is divided into groups, is set { 2}, { 3,4}, { 5,6,7,8} arranges respectively the pilot tone mapping mode according to different pilot densities.

9. the processing method of demodulation pilot frequency mapping according to claim 1, is characterized in that, when maximum supporting layer number is 8, according to { 1}, { 2,3,4} { when 5,6,7,8} is divided into groups, is set { 2,3,4}, { 5,6,7,8} arranges respectively the pilot tone mapping mode according to different pilot densities.

10. the processing method of demodulation pilot frequency mapping according to claim 1, is characterized in that, when maximum supporting layer number is 8, and according to { 1}, { 2,3, when 4,5,6,7,8} is divided into groups, it is set { 2,3,4,5,6,7,8} independently arranges the pilot tone mapping mode according to pilot density.

11. the processing method of demodulation pilot frequency mapping according to claim 1, it is characterized in that, when maximum supporting layer number is K, K is greater than 1 positive integer, and according to { 1}, { 2}, { 3}, 4} ... { when K} is divided into groups, independently for each set, according to pilot density, different pilot tone mapping modes is set respectively.

12. the processing method according to the described demodulation pilot frequency mapping of any one in claim 6 to 11, is characterized in that, when number of layers belong to set during 2}, corresponding pilot tone mapping mode is specially:

For the data burst of normal cyclic prefix, in time domain, layer 0 is mapped on the 3rd OFDM symbol of the 4th OFDM symbol of even number time slot and odd number time slot, and determines according to u=3 or u=4 in the density distribution of frequency domain; Layer 1 is mapped on the 6th OFDM symbol of the 7th OFDM symbol of even number time slot and odd number time slot, and determines according to u=3 or u=4 in the density distribution of frequency domain;

Perhaps for the data burst of extended cyclic prefix, in time domain, layer 0 and layer 1 are mapped on the 2nd, 5 OFDM symbols of the 5th OFDM symbol of even number time slot and odd number time slot, and the frequency domain density of layer 0 and layer 1 is determined according to u=2 or u=3.

13. the processing method according to the described demodulation pilot frequency mapping of any one in claim 6 to 11, is characterized in that, when number of layers belongs to set { 2,3,4} or set { 3,4} or { 2,3,4,5,6,7,8} or during 4}, corresponding pilot tone mapping mode is specially:

Data burst for normal cyclic prefix, in time domain, layer 0 and layer 1 are mapped on the 3rd OFDM symbol of the 4th OFDM symbol of even number time slot and odd number time slot, and layer 2 and layer 3 are mapped on the 6th OFDM symbol of the 7th OFDM symbol of even number time slot and odd number time slot; At frequency domain, the u=6 of every layer of correspondence or u=4;

Perhaps, for the data burst of extended cyclic prefix, in time domain, layer 0, layer 1, layer 2 and layer 3 are mapped in the 5th OFDM symbol of even number time slot, and on the 2nd, 5 OFDM symbols of odd number time slot; The u=12 of each layer of correspondence or u=6.

14. the processing method according to the described demodulation pilot frequency mapping of any one in claim 6 to 11, is characterized in that, when number of layers belongs to set { 2,3,4} or set { 3,4} or { 2,3,4,5,6,7,8} or during 4}, the pilot tone mapping mode of corresponding normal cyclic prefix is specially:

In time domain, layer 0 is mapped on the 3rd OFDM symbol of the 4th OFDM symbol of even number time slot and odd number time slot, layer 1 is mapped on the 6th OFDM symbol of the 7th OFDM symbol of even number time slot and odd number time slot, and layer 2 and layer 3 are mapped on the 7th OFDM symbol of the 6th OFDM symbol of even number time slot and odd number time slot;

Layer 0 and layer 1 position distribution on frequency domain determine according to u=4 or u=3, on the 6th OFDM symbol of even number time slot and on the 7th OFDM symbol of odd number time slot, and u=4 or the u=6 of layer 2 and layer 3 correspondence.

15. the processing method according to the described demodulation pilot frequency mapping of any one in claim 6 to 11, is characterized in that, when number of layers belong to set 2,3,4,5,6,7,8} or 5,6,7,8} or during 8}, corresponding pilot tone mapping mode is specially:

For the data burst of normal cyclic prefix, in time domain, layer 0, layer 1 is mapped to the 4th OFDM symbol of even number time slot and the 3rd OFDM symbol of odd number time slot; Layer 2 and layer 3 are mapped to the 7th OFDM symbol of even number time slot and the 6th OFDM symbol of odd number time slot; Layer 4, layer 5, layer 6 and layer 7 are mapped on the 4th OFDM symbol of the 6th OFDM symbol of even number time slot and odd number time slot; At frequency domain, layer 0, layer 1, layer 2, u=6 or the u=4 of layer 3 correspondence, layer 4, layer 5, u=6 or the u=12 of layer 6 and layer 7 correspondence;

Perhaps for the data burst of extended cyclic prefix, in time domain, layer 0, layer 1, layer 2, layer 3 is mapped to the 5th OFDM symbol of even number time slot and the 5th OFDM symbol of odd number time slot; Layer 4, layer 5, layer 6 and layer 7 are mapped on the 6th OFDM symbol of the 6th OFDM symbol of even number time slot and odd number time slot, at frequency domain, and layer 0, layer 1, the u=6 of layer 2 and layer 3 correspondence, u=6 or the u=12 of layer 4, layer 5, layer 6 and layer 7 correspondence.

16. the processing unit of a demodulation pilot frequency mapping, is characterized in that, this device comprises:

The pilot settings module, divided into groups for the various available layers number situations to channel, and each group arranged to the pilot tone mapping mode according to different pilot density expenses;

The mapping mode acquisition module, for obtain the available layers number of channel according to channel information, determine the information of organizing under the available layers number of channel, pilot tone mapping mode corresponding to group under obtaining;

The pilots insertion module, for inserting the demodulation pilot frequency of each layer according to affiliated group of corresponding pilot tone mapping mode;

Precoding module, for the channel information according to user feedback, carry out precoding to the demodulation pilot frequency on each layer and the identical pre-coding matrix of the data, and sent in different antennae.

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