CN101841355A - 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

Demodulation pilot frequency mapping processing method and device

Technical field

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

Background technology

The high-order multi-antenna technology is one of key technology of senior Long Term Evolution (LTE-Advanced, Long-Term Evolution Advance) system, in order to improve system transmissions speed.In order to realize introducing channel quality measurement and the data demodulates behind the high-order multi-antenna technology, the LTE-Advanced system has defined data demodulates pilot tone and channel quality measurement pilot tone respectively.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 transmission on scheduled resources piece (RB, Resource Block) and corresponding layer;

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, the different transport layer is orthogonal;

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

In the prior art based on the dedicated pilot of antenna port 5, for normal cyclic prefix (Normal CP, 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 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, existing pilot frequency system can not well be taken into account the balance of pilot-frequency expense and precision of channel estimation among the LTE, 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 demodulation pilot frequency mapping processing method and device, to realize being used 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 demodulation pilot frequency mapping processing method, this method comprises:

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

According to the available layers number of channel information acquisition channel, determine the information of the affiliated group of available layers number of described channel, organize the pilot tone mapping mode of correspondence under obtaining;

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

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

Data burst for normal cyclic prefix, described pilot tone takies the 4th, 7 OFDM symbol of even number time slot and the 3rd, 6 OFDM symbol 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 symbol 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 symbol 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:

Perhaps

And the frequency domain position of different layers is mutually orthogonal;

Wherein,

Represent user terminal UE specific pilot signal Resource Unit counter in each OFDM symbol; v _ShiftThe expression specific frequency shift (FS) in sub-district, v _ShiftValue can for fixed constant or

The expression cell identifier;

During expression physical down link sharing channel PDSCH transmission, the bandwidth of representing with Resource Block RB number;

The frequency domain size of the RB that expression is represented with the subcarrier number; n _PRBExpression RB is at the index of frequency domain; U represents pilot density, is used to adjust the pilot tone number of each OFDM symbol on the RB frequency domain direction, and u is the positive integer more than or equal to 1; K represents the relative displacement of the corresponding pilot tone of different layers.

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

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

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

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

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

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

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

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 the 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 the 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 the OFDM symbol 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 the 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 the 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 the OFDM symbol of odd number time slot; The u=12 of each layer correspondence or u=6.

When number of layers belong to set 2,3, and 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 the OFDM symbol of the 4th OFDM symbol of even number time slot and odd number time slot, layer 1 is mapped on the 6th the 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 the 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 the OFDM symbol of even number time slot and on the 7th the OFDM symbol of odd number time slot, and the 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 are 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 the 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, the u=6 or the u=4 of layer 3 correspondence, layer 4, layer 5, the 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 are 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 the 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, the 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:

Pilot tone is provided with module, is used for the various available layers number situations of channel are divided into groups, and each group is provided with the pilot tone mapping mode according to different pilot density expenses;

The mapping mode acquisition module is used for the available layers number according to channel information acquisition channel, determines the information of the affiliated group of available layers number of channel, organizes the pilot tone mapping mode of correspondence under obtaining;

The pilot tone insert module is used for inserting according to the pilot tone mapping mode of affiliated group of correspondence the demodulation pilot frequency of each layer;

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

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

Description of drawings

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

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

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

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

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

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

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

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

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

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

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

Embodiment

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

A kind of demodulation pilot frequency mapping processing method provided by the present invention as shown in Figure 3, mainly may further comprise the steps:

Step 301 is divided into groups to the various available layers number situations of channel, and each group is provided with 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 among the LTE.For other groupings, the new pilot tone mapping mode of independent setting respectively.For example, when maximum supporting layer number is 4, and according to 1}, 2}, 3, when 4} divides into groups, be provided with respectively corresponding to 2} and 3, the pilot tone mapping mode of 4} set; When maximum supporting layer number is 4, and according to 1}, and 2,3, when 4} divides into groups, be provided with corresponding to 2,3, the pilot tone mapping mode of 4} set; When maximum supporting layer number is 8, and according to 1}, and 2,3,4}, 5,6,7, when 8} divides into groups, be provided with respectively 2,3,4} and 5,6,7, the corresponding pilot tone mapping mode of 8} set; When the number of layers of maximum support is K (K for greater than 1 positive integer), and according to 1}, and 2}, 3}, 4} ... { when K} divides into groups, then independently different pilot tone mapping modes is set for each set.Packet mode in the practical application also has a lot, enumerates no longer one by one at this.

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 the third generation partner program (3GPP, 3rd Generation Partnership Project) 36.211, and can expand.Data burst for normal cyclic prefix, pilot tone is mapped in the 4th, 7 OFDM symbol of even number time slot and the 3rd, 6 OFDM symbol 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 symbol 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 symbol 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:

$({\mathrm{um}}^{\′}+v_{\mathrm{shift}})\mathrm{mod}{N}_{\mathrm{SC}}^{\mathrm{RB}}+N_{\mathrm{SC}}^{\mathrm{RB}}\·n_{\mathrm{PRB}}---\left(1\right)$

Perhaps

Wherein,

Be UE specific pilot signal Resource Unit counter in each OFDM symbol; v _ShiftBe the specific frequency shift (FS) in sub-district, its value can for fixed constant or

For cell identifier (ID, Identity);

Expression physical down link sharing channel (PDSCH, Physical Downlink Shared Channel) when transmission, the bandwidth of representing with the RB number;

Frequency domain size for the RB that represents with the subcarrier number; n _PRBExpression RB is at the index of frequency domain.U factor is used to adjust the pilot tone number of each OFDM symbol on the RB frequency domain direction, and it is the positive integer more than or equal to 1; K is a relative displacement; In following formula,

Be used for determining the carrier wave original position of current RB correspondence; Um '+v _ShiftThe position of the pilot tone of correspondence mappings in current RB is for fear of um '+v _ShiftExceed the carrier number of a RB, right

Carry out delivery, thereby skew is

Step 302 according to the available layers number of channel information acquisition channel, is determined the information of the affiliated group of available layers number of channel, organizes the pilot tone mapping mode of correspondence under obtaining.

For example: for maximum supporting layer number is 8 situation, and according to { 1}, { 2,3,4}, { 5,6,7, when 8} divides into groups, if according to the channel information of user feedback, perhaps utilize the channel information of the reciprocity acquisition of channel to know that channel can use k=3 layer to carry out the transmission of data, then by k and each set are compared, can determine this moment number of layers belong to set 2,3,4}, and then can obtain in the step 301 for set 2,3, the pilot tone mapping mode that 4} is provided with.

Step 303 is inserted the demodulation pilot frequency of each layer according to the pilot tone mapping mode of affiliated group of correspondence.

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

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

Below in the 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}, { 3, when 4} divided into groups, { the pilot tone mapping mode that 2} is provided with as shown in Figure 4 and Figure 5 for set.

For the data burst of normal cyclic prefix, in time domain, the pilot tone R of layer 0 ₀Be mapped on the 3rd the 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 the 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 ₁The frequency domain position of pilot tone obtains according to above-mentioned formula (2) in the OFDM symbol of mapping, and corresponding R ₀The u value be 3, the k value is 1, corresponding R ₁The u value be 3, the 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 the OFDM symbol 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 is promptly got 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}, and 3, when 4} divides into groups, for set 3, the pilot tone mapping mode that 4} is provided with; Perhaps according to 1}, and 2,3, when 4} divides into groups, for set 2,3, the pilot tone mapping mode that 4} is provided with; Perhaps when maximum supporting layer number be 8, and according to 1}, 2,3,4}, 5,6,7, when 8} divides into groups, for set 2,3, the pilot tone mapping mode that 4} is provided with, perhaps during other groupings for set the pilot tone mapping mode that 4} is provided with, 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 the 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 the 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 the OFDM symbol of odd number time slot; The u=12 of each layer 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}, and 3, when 4} divides into groups, for set 3, the pilot tone mapping mode that 4} is provided with; Or according to 1}, 2,3, when 4} divides into groups, for set 2,3, the pilot tone mapping mode that 4} is provided with; Or according to 1}, 2,3,4,5,6,7, when 8} divides into groups, for set 2,3,4,5,6,7, the pilot tone mapping mode that 8} is provided with; Or other whens grouping for set the pilot tone mapping mode that 4} is provided with, 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 the OFDM symbol of the 4th OFDM symbol of even number time slot and odd number time slot; R ₁Be mapped on the 6th the 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 the 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 the OFDM symbol of even number time slot and on the 7th the 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 symbol of even number time slot, and on the 3rd and 6 the OFDM symbol of odd number time slot, shine upon according to formula (1), wherein the u value is 3 or 4.The u value be 4 mapping mode 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, shine upon according to formula (2), 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}, and 2,3,4}, 5,6,7, when 8} divides into groups, for set 5,6,7, the pilot tone mapping mode that 8} is provided with; Perhaps according to 1}, and 2,3,4,5,6,7, when 8} divides into groups, for set 2,3,4,5,6,7, the pilot tone mapping mode that 8} is provided with, { the pilot tone mapping mode of 8} setting is as Fig. 9 and shown in Figure 10 perhaps to be grouped into set according to other.

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 the 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 ₇The position obtain according to formula (2), 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 the 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 ₇The position obtain according to formula (2), 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.

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

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

For realizing the invention described above demodulation pilot frequency mapping processing method, the present invention also provides a kind of processing unit of demodulation pilot frequency mapping, as shown in figure 11, this device comprises: pilot tone is provided with module 10, mapping mode acquisition module 20, pilot tone insert module 30 and precoding module 40.Wherein, pilot tone is provided with module 10, is used for the various available layers number situations of channel are divided into groups, and each group is provided with the pilot tone mapping mode according to different pilot density expenses.Mapping mode acquisition module 20 connects pilot tone module 10 is set, and is used for obtaining according to channel information the available layers number of channel, determines the information of the affiliated group of available layers number of channel, the pilot tone mapping mode of group correspondence under obtaining.Pilot tone insert module 30 connects mapping mode acquisition module 20, is used for inserting according to the pilot tone mapping mode of affiliated group of correspondence the demodulation pilot frequency of each layer.Precoding module 40 connects pilot tone insert module 30, is used for the channel information according to user feedback, demodulation pilot frequency on each layer and the identical pre-coding matrix of The data is carried out precoding, and send in different antennae.

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

Claims (16)

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

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

According to the available layers number of channel information acquisition channel, determine the information of the affiliated group of available layers number of described channel, organize the pilot tone mapping mode of correspondence under obtaining;

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

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

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

3. according to the described demodulation pilot frequency mapping processing method of 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 symbol 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.

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

Perhaps And the frequency domain position of different layers is mutually orthogonal;

Wherein,

Represent user terminal UE specific pilot signal Resource Unit counter in each OFDM symbol; v _ShiftThe expression specific frequency shift (FS) in sub-district, v _ShiftValue can for fixed constant or

The expression cell identifier;

During expression physical down link sharing channel PDSCH transmission, the bandwidth of representing with Resource Block RB number;

The frequency domain size of the RB that expression is represented with the subcarrier number; n _PRBExpression RB is at the index of frequency domain; U represents pilot density, is used to adjust the pilot tone number of each OFDM symbol on the RB frequency domain direction, and u is the positive integer more than or equal to 1; K represents the relative displacement of the corresponding pilot tone of different layers.

5. according to the described demodulation pilot frequency mapping processing method of claim 1, it is characterized in that when the available layers number of channel was 1, the UE-specific pilot tone pattern of continuing to use LTE 3GPP 36.211 definition according to DMRS was provided with the pilot tone mapping mode.

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

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

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

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

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

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

12. according to each described demodulation pilot frequency mapping processing method in the claim 6 to 11, it 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 the 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 the 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 the OFDM symbol 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. according to each described demodulation pilot frequency mapping processing method in the claim 6 to 11, it is characterized in that, when number of layers belong to set 2,3, and 4} or the 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 the 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 the 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 the OFDM symbol of odd number time slot; The u=12 of each layer correspondence or u=6.

14. according to each described demodulation pilot frequency mapping processing method in the claim 6 to 11, it is characterized in that, when number of layers belong to set 2,3, and 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 the OFDM symbol of the 4th OFDM symbol of even number time slot and odd number time slot, layer 1 is mapped on the 6th the 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 the 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 the OFDM symbol of even number time slot and on the 7th the OFDM symbol of odd number time slot, and the u=4 or the u=6 of layer 2 and layer 3 correspondence.

15. according to each described demodulation pilot frequency mapping processing method in the claim 6 to 11, it 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 are 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 the 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, the u=6 or the u=4 of layer 3 correspondence, layer 4, layer 5, the 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 are 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 the 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, the 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:

Pilot tone is provided with module, is used for the various available layers number situations of channel are divided into groups, and each group is provided with the pilot tone mapping mode according to different pilot density expenses;

The mapping mode acquisition module is used for the available layers number according to channel information acquisition channel, determines the information of the affiliated group of available layers number of channel, organizes the pilot tone mapping mode of correspondence under obtaining;

The pilot tone insert module is used for inserting according to the pilot tone mapping mode of affiliated group of correspondence the demodulation pilot frequency of each layer;

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

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