CN102984102A - Method for uplink data transmission, method for uplink data processing, terminal and base station - Google Patents

Abstract

The embodiment of the present invention discloses a method for uplink data transmission, a method for uplink data processing, a terminal and a base station. The method for uplink data transmission comprises: obtaining data symbols mapped to different transport layers after modulation by a terminal; precoding the data symbols by using a plurality of precoding matrices respectively; performing a DFT (discrete Fourier transform) to the precoded data symbols; and performing uplink transmission according to the data symbols after the DFT. According to the embodiment of the present invention, during the uplink data transmission, by using a plurality of precoding matrices to different data symbols, because all data symbols mapped to different transport layers are symbols on the modulation constellation, and therefore precoding is carried out prior to the DFT transform of the data symbols, characteristics of the precoded data symbols is not changed; then DFT and IDFT (inverse discrete Fourier transform) is performed to the precoded data symbols, and the data symbols can be maintained to be always symbols on the modulation constellation; so the CM characteristics of the data symbols can be maintained when the uplink adopts a plurality of precoding matrices to perform the precoding.

Description

Upstream data transmission, uplink data processing method, terminal and base station

Technical field

The application relates to communication technical field, particularly relates to method for transmitting uplink data, uplink data processing method, terminal and base station.

Background technology

At LET (Long Term Evolution, Long Term Evolution) in, for CM (the Cubic Metric that reduces up transmitted signal, cube estimate) characteristic, usually use SC-FDMA (Single Carrier Frequency Division Multiple Access, single-carrier frequency division multiple access) as multi-access mode.In the senior evolution LTE-A of LTE, the up SC-FDMA that continues to use is as multi-access mode, and can support at most four antennas to carry out the transmission of upward signal.

In the prior art, terminal at first obtains uplink pre-coding matrix from the base station, can obtain the number of plies of transport layer according to the order of this uplink pre-coding matrix, when passing through PUSCH (Physical Uplink Shared Channel, up link is shared physical channel) when carrying out the upward signal transmission, for the code word after the modulation, these code words are mapped to corresponding transport layer, data symbol for every one deck carries out respectively the DFT conversion, then the data symbol after the DFT conversion is carried out up precoding according to aforementioned uplink pre-coding matrix, at last the antenna data after the precoding is mapped to corresponding time-domain resource, sends after the transmitting data process IDFT conversion with every behind resource mapping antenna.

The inventor finds in the research process to prior art, in carrying out the upstream data process of transmitting, for different data symbols, if adopt a plurality of pre-coding matrixes, then the data symbol before carrying out the DFT conversion all is the symbol on the modulation constellation, after process DFT conversion and carrying out precoding, the characteristic of data symbol changes, therefore the data symbol after the process IDFT conversion no longer is the symbol on the modulation constellation, namely through being difficult to obtain DFT conversion symbol before after the IDFT conversion, therefore be difficult to keep the CM characteristic of data symbol.

Summary of the invention

The embodiment of the present application provides a kind of method for transmitting uplink data, uplink data processing method, terminal and base station, is difficult to keep the problem of data CM characteristic to solve the existing upstream data that sends.

In order to solve the problems of the technologies described above, the embodiment of the present application discloses following technical scheme:

A kind of method for transmitting uplink data comprises:

Terminal is obtained the data symbol that is mapped to after the modulation on the different transport layers;

Adopt a plurality of pre-coding matrixes to carry out respectively precoding to described data symbol;

Data symbol after the described precoding is carried out discrete Fourier transform DFT conversion;

Carry out up transmission according to the data symbol after the described DFT conversion.

A kind of uplink data processing method is used for the data symbol that aforementioned method for transmitting uplink data sends is processed, and described method comprises:

The upstream data symbol that the base station sends by the antenna reception terminal;

Described upstream data symbol is carried out conversion, obtain the time domain data symbol;

Adopt a plurality of pre-coding matrixes to detect respectively to described time domain data symbol;

Data symbol after detecting through after the channel decoding, is exported corresponding code word.

A kind of terminal comprises:

Acquiring unit is used for obtaining the data symbol that is mapped to after the modulation on the different transport layers;

Precoding unit, the data symbol that is used for described acquiring unit is obtained adopts a plurality of pre-coding matrixes to carry out respectively precoding;

The DFT converter unit is used for the data symbol after the described precoding unit precoding is carried out the DFT conversion;

Transmitting element is used for carrying out up transmission according to the data symbol after the described DFT converter unit DFT conversion.

A kind of base station is used for the data symbol that aforementioned terminals sends is processed, and described base station comprises:

Receiving element is used for the upstream data symbol that sends by the antenna reception terminal;

Converter unit is used for the described upstream data symbol that described receiving element receives is carried out conversion, obtains the time domain data symbol;

Detecting unit is used for adopting a plurality of pre-coding matrixes to detect respectively to the time domain data symbol that described converter unit obtains;

Decoding unit is used for the data symbol after the described detecting unit detection is carried out channel decoding.

As can be seen from the above-described embodiment, terminal is obtained the data symbol that is mapped to after the modulation on the different transport layers in the embodiment of the present application, adopt a plurality of pre-coding matrixes to carry out respectively precoding to the data symbol, data symbol after the precoding is carried out the DFT conversion, carry out up transmission according to the data symbol after the DFT conversion.The embodiment of the present application is when carrying out the upstream data transmission, different data symbols is adopted a plurality of pre-coding matrixes, owing to be mapped to data symbol on the different transport layers and all be the symbol on the modulation constellation, therefore it is carried out carrying out first precoding before the DFT conversion, then the characteristic of the data symbol after the precoding can not change, data symbol after the precoding is carried out DFT conversion and IDFT conversion more then can keep data symbol to be always symbol on the modulation constellation, therefore can when a plurality of pre-coding matrixes of up employing carry out precoding, keep the CM characteristic of data symbol.

Description of drawings

In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the first embodiment flow chart of the application's method for transmitting uplink data;

Fig. 2 A is the Dole embodiment flow chart of the application's method for transmitting uplink data;

Fig. 2 B to Fig. 2 E is the mapping relations schematic diagram of the code word after modulating to transport layer;

Fig. 2 F is the grid partition structure schematic diagram of ascending resource time domain and frequency domain;

Fig. 2 G is the structural representation of a LTE sub-frame of uplink;

Fig. 3 A carries out the process schematic diagram that upstream data sends for using the embodiment of the present application;

Fig. 3 B is the schematic diagram that carries out up precoding and DFT conversion among Fig. 3 A;

Fig. 4 is the embodiment flow chart of the application's uplink data processing method;

Fig. 5 carries out the process schematic diagram that upstream data is processed for using the embodiment of the present application;

Fig. 6 A is the embodiment block diagram of the application's terminal;

Fig. 6 B is the embodiment block diagram of acquiring unit among Fig. 6 A;

Fig. 6 C is the embodiment block diagram of precoding unit among Fig. 6 A;

Fig. 6 D is the embodiment block diagram of transmitting element among Fig. 6 A;

Fig. 7 A is the embodiment block diagram of the application base station;

Fig. 7 B is the embodiment block diagram of converter unit among Fig. 7 A;

Fig. 7 C is the embodiment block diagram of detecting unit among Fig. 7 A.

Embodiment

The present invention following embodiment provide a kind of method for transmitting uplink data, uplink data processing method, terminal and base station.

In order to make those skilled in the art person understand better technical scheme in the embodiment of the invention, and the above-mentioned purpose of the embodiment of the invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing technical scheme in the embodiment of the invention is described in further detail.

The below at first adopted the code book of the corresponding pre-coding matrix of antenna of different numbers to be introduced to terminal before the application's upstream data transmission embodiment is described.

When the base station is after terminal is selected a pre-coding matrix according to current channel status, can pass through DCI (Downlink control information, Downlink Control Information) with PMI (the Recoding Matrix Index of pre-coding matrix, the precoding vector index number) feeds back to terminal, carry out precoding processing so that terminal is obtained corresponding pre-coding matrix according to PMI.In the application's upstream data process of transmitting, adopt a plurality of pre-coding matrixes that different data are carried out precoding, so the base station can send to terminal with selected a plurality of pre-coding matrixes.

Terminal can adopt two antennas or four antennas when carrying out the upstream data emission.Wherein, the code book of the pre-coding matrix of two antennas is as shown in table 1 below:

Table 1

Order 1 code book of four antenna pre-coding matrixes is as shown in table 2 below:

Table 2

Order 2 code books of four antenna pre-coding matrixes are as shown in table 3 below:

Table 3

Order 3 code books of four antenna pre-coding matrixes are as shown in table 4 below:

Table 4

Order 4 code books of four antenna pre-coding matrixes are as shown in table 5 below:

Table 5

The pre-coding matrix of above-mentioned table 1 to the table 5, corresponding transmitting antenna of every delegation wherein, the corresponding transport layer of each row.Follow-up, the process of transmitting of the application's upstream data is described in meeting in conjunction with above-mentioned code book.

Referring to Fig. 1, be the first embodiment flow chart of the application's method for transmitting uplink data:

Step 101: terminal is obtained the data symbol that is mapped to after the modulation on the different transport layers.

Step 102: adopt a plurality of pre-coding matrixes to carry out respectively precoding to the data symbol.

Concrete, data symbol on all transport layers is divided into groups, each group data symbol after the grouping comprises in all transport layers N continuous on each transport layer data symbol, N is natural number, for each group data symbol distributes a pre-coding matrix, adopt the pre-coding matrix that distributes to carry out precoding each group data symbol, the transmitting antenna that the data symbol after the precoding is corresponding different.

Step 103: the data symbol after the precoding is carried out the DFT conversion.

Concrete, the corresponding data symbol of each transmit antennas is carried out respectively the DFT conversion.

Step 104: carry out up transmission according to the data symbol after the DFT conversion.

Concrete, the data symbol after the DFT conversion is carried out resource mapping, the antenna by correspondence after the process of the data symbol behind the resource mapping IDFT conversion is sent.

Referring to Fig. 2 A, be the second embodiment flow chart of the application's method for transmitting uplink data, this embodiment shows in detail the upstream data process of transmitting:

Step 201: terminal is carried out respectively code word with transmission block to be sent and is shone upon to obtain corresponding code word.

Step 202: the code word after the code word mapping is encoded and scrambling by channel independently.

Step 203: the code word after the scrambling is modulated.

Step 204: the code word after will modulating is mapped on the different transport layers, and each code word correspondence mappings is one group of data symbol at least one transport layer.

Be the mapping relations of the code word after modulating to transport layer referring to Fig. 2 B to Fig. 2 E, wherein hypothesis has two code words, and it shows respectively the mapping relations of four layers of transmission:

Wherein, be order 1 transmission among Fig. 2 B, namely the code word 0 after the modulation is carried out one deck transmission, is mapped to layer 1; Be order 2 transmission among Fig. 2 C, namely code word 0 and the code word 1 after the modulation carried out two layers of transmission, and code word 0 is mapped to layer 1, and code word 1 is mapped to layer 2; Fig. 2 D is order 3 transmission, and namely code word 0 and the code word 1 after the modulation carried out three layers of transmission, and code word 0 is mapped to layer 1, and code word 1 is mapped to layer 2 and layer 3; Fig. 2 E is order 4 transmission, and namely code word 0 and the code word 1 after the modulation carried out four layers of transmission, and code word 0 is mapped to layer 1 and layer 2, and code word 1 is mapped to layer 3 and layer 4.

Step 205: the data symbol on all transport layers is divided into groups, and each the group data symbol after the grouping comprises in all transport layers N continuous on each transport layer data symbol.

Wherein, N is natural number.For example, suppose total M transport layer, then the data symbol on M the transport layer divided into groups that if N is 2, each after then dividing into groups is organized data symbol and comprised in M the transport layer 2 continuous on each transport layer data symbols.

Step 206: obtain a plurality of pre-coding matrixes according to the base station indication.

Terminal was understood elder generation to base station reporting uplink information before sending upstream data, after by the base station uplink information being measured, and employed pre-coding matrix when selecting the terminal precoding, and the communication of a plurality of pre-coding matrixes that will select is to terminal.

Need to prove, this step 206 is obtained a plurality of pre-coding matrixes of base station indication and can be carried out before step 201, after namely receiving the indication information of base station, just therefrom obtain a plurality of pre-coding matrixes, perhaps, also can with abovementioned steps 201 any one step executed in parallel to the step 205, as long as namely guaranteed before distributing a pre-coding matrix for each group data symbol, can from the indication of base station, get access to a plurality of pre-coding matrixes and get final product, not limit for time the embodiment of the present application of obtaining a plurality of pre-coding matrixes.

Step 207: for each group data symbol distributes a pre-coding matrix.

Step 208: adopt the pre-coding matrix that distributes to carry out precoding each group data symbol, the transmitting antenna that the data symbol after the precoding is corresponding different.

Step 209: the corresponding data symbol of each transmit antennas is carried out respectively the DFT conversion.

Step 210: the data symbol after the DFT conversion is carried out resource mapping.

Referring to Fig. 2 F, be the grid partition structure schematic diagram of ascending resource time domain and frequency domain:

In the LTE and LTE-A system of 3GPP, the up employing of terminal SC-FDMA access mode.The ascending resource of system has been divided into the SC-FDMA symbol from the time, is divided into subcarrier from frequency.Wherein, a normal sub-frame of uplink contains 14 SC-FDMA symbols (time slot equals subframe length half among Fig. 2 F) from the time, contains 12 OFDM symbols from frequency.Among Fig. 2 F, show in a time slot, RB (Resource Block, Resource Block) is the least unit of scheduling of resource, and a RB comprises 12 subcarriers at frequency domain, is that half subframe is long in time domain, has namely comprised 7 symbols.Each RE (Resource Element, resource units) is a resource units, and it can be defined as certain subcarrier on certain SC-FDMA symbol.

Referring to Fig. 2 G, be the structural representation of normal (Normal) sub-frame of uplink of a LTE:

This subframe comprises two time slots, and 7 symbols of each slot transmission (can be defined as the SC-FDMA symbol) wherein have a frequency pilot sign.

Step 211: the antenna by correspondence after the process of the data symbol behind the resource mapping IDFT conversion is sent.

By the embodiment of above-mentioned method for transmitting uplink data as seen, different data symbols is adopted a plurality of pre-coding matrixes, owing to be mapped to data symbol on the different transport layers and all be the symbol on the modulation constellation, therefore it is carried out carrying out first precoding before the DFT conversion, then the characteristic of the data symbol after the precoding can not change, data symbol after the precoding is carried out DFT conversion and IDFT conversion more then can keep data symbol to be always symbol on the modulation constellation, therefore can when a plurality of pre-coding matrixes of up employing carry out precoding, keep the CM characteristic of data symbol.

Referring to Fig. 3 A, adopt four antenna orders, 2 code books with terminal, send data instance with two code words, show a kind of implementation of using the embodiment of the present application and carry out the process schematic diagram that upstream data sends:

Suppose that terminal is up and carry out two TB (Transport Block, transmission block) transmission, be respectively TB1 and TB2, above-mentioned these two TB pass through respectively CW (Codeword, code word) after the mapping, obtain CW1 and CW2, above-mentioned two CW are through chnnel coding independently, scrambling, after the modulation, two CW after the modulation are mapped to different transport layers, every layer data are through DFT (Discrete Fourier Transform, discrete Fourier transform) carries out precoding at frequency domain after the conversion, data after the precoding are assigned to respectively on corresponding RB (Resource Block, Resource Block) or the subcarrier through resource mapping, then pass through IDFT (Inverse Discrete Fourier Transform, inverse discrete Fourier transform) conversion is gone out by many antenna transmissions.

Fig. 3 B is the schematic diagram that carries out up precoding and DFT conversion among Fig. 3 A:

Suppose that CW0 and CW1 are two code words after the modulation, the code word after each modulation represents with one group of data symbol.Because four antenna orders, 2 code books are adopted in precoding among Fig. 3 A, i.e. code book shown in the table 3, so CW0 is mapped to layer 1, and CW1 is mapped to layer 2, and wherein, one group of data symbol that CW0 is corresponding is expressed as d ₁, d ₂, d ₃... d _n, one group of data symbol that CW1 is corresponding is expressed as s ₁, s ₂, s ₃... s _nAmong Fig. 3 B, in each group data symbol, suppose that every continuously D data symbol is one group, pre-coding matrix of every group of use is carried out precoding, for example, when D is 2, per two data symbols are one group, then can be divided into altogether i group, and the span of i is 1 to (1/2) n.In Fig. 3 B, d ₁And d ₂Adopt pre-coding matrix v ₁, d ₃And d ₄Adopt pre-coding matrix v ₂, i.e. pre-coding matrix v _iBe the matrix of 4 * 2 shown in the table 3, then adopt i pre-coding matrix v _iThe data symbol that carries out precoding is the data symbol d on the first transport layer _{2 (i-1)+1}, d _{2 * i}, and the data symbol s on the second transport layer _{2 (i-1)+1}, s _{2 * i}Then first data symbols on two transport layers adopts v ₁Carry out being x after the precoding ₁, then be expressed as:

$x_1=V_1\left[\begin{array}{c}{d}_1\\ {\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="HDA0000088669460000052.png"\; state="\{\{state\}\}">s</figure-callout>}}_1\end{array}\right],$ Can specifically be expressed as:

$x_1=\left[\begin{array}{c}{x}_{11}\\ x_{21}\\ x_{31}\\ x_{41}\end{array}\right];$

Above-mentioned x ₁Be 4 * 1 vector, be the data after the precoding.The like, after each symbol passed through precoding, defining i root antenna was x through the symbol sebolic addressing that obtains after the precoding _I1, x _I2..., x _InThe number of the n data symbol that need to send for each transport layer wherein perhaps also can be called the number of the shared subcarrier of the PDSCH of this terminal.Then data to be sent on the every antenna are carried out the DFT conversion, then be put into corresponding subcarrier in frequency domain through the data of resource mapping after with every antenna DFT conversion, finally by mistake these data are carried out respectively sending after the IDFT conversion.

When following selective analysis is used the embodiment of the present application once and carried out transmitting uplink data, carry out first precoding and carry out again the CM characteristic how the DFT conversion keeps data symbol:

In above-described embodiment, if the size of DFT is N, then the IDFT size is M, usually M 〉=N.Suppose N=M=4, the symbol before each DFT is used different precoding matrixs, and suppose that order is 2, then use altogether 4 precoding matrixs, suppose to use front 4 precoding matrixs of order 2, these 4 matrixes are as follows respectively:

$\frac{1}{2}\left[\begin{array}{cc}1& 0\\ 1& 0\\ 0& 1\\ 0& -j\end{array}\right],\frac{1}{2}\left[\begin{array}{cc}1& 0\\ 1& 0\\ 0& 1\\ 0& j\end{array}\right],\frac{1}{2}\left[\begin{array}{cc}1& 0\\ -j& 0\\ 0& 1\\ 0& 1\end{array}\right],\frac{1}{2}\left[\begin{array}{cc}1& 0\\ -j& 0\\ 0& 1\\ 0& -1\end{array}\right]$

Wherein, suppose that the data symbol on each transport layer is 4, have two transport layers, then the data symbol of the first transport layer is d ₁, d ₂, d ₃And d ₄, the data symbol on second transport layer is s ₁, s ₂, s ₃And s ₄A data symbol on each transport layer is one group, then d ₁And s ₁Be one group, d ₂And s ₂Be one group, d ₃And s ₃Be one group, d ₅And s ₄It is one group.Corresponding each the group data symbol of above-mentioned 4 pre-coding matrixes order, carry out precoding after, four groups of data symbols that obtain are as follows:

$\frac{1}{2}\left[\begin{array}{cc}1& 0\\ 1& 0\\ 0& 1\\ 0& -j\end{array}\right]\&times;\left[\begin{array}{c}{d}_1\\ {\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="HDA0000088669460000052.png"\; state="\{\{state\}\}">s</figure-callout>}}_1\end{array}\right]=\left[\begin{array}{c}{d}_1\\ d_1\\ s_1\\ {-\mathrm{<figure-callout\; id="1"\; label="js"\; filenames="HDA0000088669460000052.png"\; state="\{\{state\}\}">js</figure-callout>}}_1\end{array}\right];$

$\frac{1}{2}\left[\begin{array}{cc}1& 0\\ 1& 0\\ 0& 1\\ 0& j\end{array}\right]\&times;\left[\begin{array}{c}{d}_2\\ {\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="HDA0000088669460000052.png"\; state="\{\{state\}\}">s</figure-callout>}}_2\end{array}\right]=\left[\begin{array}{c}{d}_2\\ d_2\\ s_2\\ {-\mathrm{<figure-callout\; id="2"\; label="js"\; filenames="HDA0000088669460000052.png"\; state="\{\{state\}\}">js</figure-callout>}}_2\end{array}\right];$

$\frac{1}{2}\left[\begin{array}{cc}1& 0\\ -j& 0\\ 0& 1\\ 0& 1\end{array}\right]\&times;\left[\begin{array}{c}{d}_3\\ s_3\end{array}\right]=\left[\begin{array}{c}{d}_3\\ {-\mathrm{jd}}_3\\ s_3\\ {-s}_3\end{array}\right];$

$\frac{1}{2}\left[\begin{array}{cc}1& 0\\ -j& 0\\ 0& 1\\ 0& -1\end{array}\right]\&times;\left[\begin{array}{c}{d}_4\\ s_4\end{array}\right]=\left[\begin{array}{c}{d}_4\\ {-\mathrm{jd}}_4\\ s_4\\ {-s}_4\end{array}\right];$

According to the result after the above-mentioned precoding as can be known, the ground floor data send at first antenna and second antenna, and second layer data send at the 3rd antenna and the 4th antenna.Take second transmitting antenna as example, shown in Fig. 3 B, on second transmitting antenna, suppose that the data symbol of not process precoding is for being d ₁, d ₂, d ₃And d ₄Then the symbol after the process precoding is d before the DFT ₁, d ₂,-jd ₃With-jd ₄Because d ₁, d ₂, d ₃, d ₄Be BPSK (Binary Phase Shift Keying simultaneously, two-phase PSK), or QPSK (Quadrature Phase Shift Keying, Quadrature Phase Shift Keying), or 16QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation) or the modulation symbol on the 64QAM, therefore according to the characteristic of modulation constellation points, when certain data symbol k is symbol on the modulation constellation points, data symbol-k then, jk ,-jk are the symbol of modulation constellation points.Make t1=-jd ₃, t2=-jd ₄, then as can be known because former d ₃And d ₄All be the symbol on the modulation constellation points, then t ₁With t ₂Be all the symbol on the modulation constellation.

Hence one can see that, and the symbol before the DFT after the process precoding is d ₁, d ₂, t ₁, t ₂, through the DFT conversion, pass through again the IDFT conversion after, the time-domain symbol that obtains is d yet ₁, d ₂, t ₁, t ₂Therefore, do not change the CM characteristic of data symbol; In like manner, when M＞N, only when the IDFT conversion, the data symbol is carried out interpolation operation, but the data symbol after the conversion still can keep the CM characteristic.

Corresponding with the embodiment of the application's end side method for transmitting uplink data, the application also provides the embodiment of the uplink data processing method that base station side processes the upstream data that receives, when the embodiment of the present application terminal sends upstream data, carry out first precoding and then carry out the DFT conversion, accordingly, when upstream data is processed in the embodiment of the present application base station, carry out first the IDFT conversion and then detect, detailed process is described below.

Referring to Fig. 4, be the embodiment flow chart of the application's uplink data processing method:

Step 401: the upstream data symbol that the base station sends by the antenna reception terminal.

Step 402: the upstream data symbol is carried out conversion, obtain the time domain data symbol.

Concrete, the DFT conversion is carried out to the upstream data symbol in the base station, obtains the frequency domain data symbol, and the frequency domain data symbol is balanced in the enterprising line frequency of each subcarrier territory, and the frequency domain data symbol behind the frequency domain equalization is carried out the IDFT conversion, obtains the time domain data symbol.

Step 403: adopt a plurality of pre-coding matrixes to detect respectively to the time domain data symbol.

Concrete, divide into groups to the time domain data symbol in the base station, each group time domain data symbol after the grouping comprises upper N the continuous data symbol of each IDFT after all IDFT conversion, described N is natural number, the quantity of wherein said IDFT is consistent with the antenna amount of terminal, for each group data symbol distributes a pre-coding matrix, adopt the pre-coding matrix that distributes to detect each group data symbol, the decoding channel that the data symbol after the detection is corresponding different.

Step 404: the data symbol after will detecting is exported corresponding code word through after the channel decoding.

By the embodiment of above-mentioned the application's uplink data processing method as seen, because end side is when carrying out the upstream data transmission, different data symbols is adopted a plurality of pre-coding matrixes, and carry out carrying out first precoding before the DFT conversion, therefore the characteristic of the data symbol after the precoding can not change, data symbol after the precoding is carried out DFT conversion and IDFT conversion again kept data symbol to be always symbol on the modulation constellation, therefore kept the CM characteristic of data symbol; Accordingly, at the base station side upstream data symbol of CM characteristic that received maintenance that terminal sends, according to the process of end side contrary, carry out first the IDFT conversion and then the data symbol detected, can improve thus the detection performance of base station, so that the code word accuracy of decoding output is higher.

In conjunction with the upstream data process of transmitting of earlier figures 3A and the described end side of Fig. 3 B, the DETAILED DESCRIPTION The present application base station side receives the processing procedure behind the upstream data, referring to Fig. 5, carries out the process schematic diagram that upstream data is processed for using the embodiment of the present application:

Wherein, suppose that terminal still sends upstream data shown in Fig. 3 A and Fig. 3 B, namely terminal adopts N _t=4 transmitting antennas, order 2 transmission.Suppose that base station side has N _rRoot (N _rBe integer) reception antenna, for example, N _rCan be two antennas or four antennas, then the signal of every reception antenna reception passes through first the DFT conversion, obtains frequency-region signal; Balanced in the enterprising line frequency of each subcarrier territory afterwards, for example, MMSE (Minimum MeanSquare Error, least mean-square error) equilibrium, that each sub-carrier frequency domain equilibrium is exported afterwards is N _t* 1 vector; Data symbol behind the frequency domain equalization transforms to time domain through IDFT, and this moment, the number of IDFT was N _t, be 4 in the present embodiment; The time domain data symbol is carried out time domain detect, detect such as the MMSE receiver, or ZF (Zero Forcing, ZF) receiver detects etc.

Above-mentioned time domain testing process namely with the precoding process contrary of end side, the below describes the time domain testing process in detail.Suppose equally with the data symbol shown in Fig. 3 B, the length of IDFT is n, then n data symbol of output after each IDFT conversion.The data symbol of first IDFT output is designated as (a ₁₁, a ₁₂..., a _1n); The data symbol of second IDFT output is designated as (a ₂₁, a ₂₂..., a _2n); The data symbol of the 3rd IDFT output is designated as (a ₃₁, a ₃₂..., a _3n); The data symbol of the 4th IDFT output is designated as (a ₄₁, a ₄₂..., a _4n).Then to j data symbol in n the data symbol, can set up following equation:

$Y_j=\left[\begin{array}{c}{a}_{1j}\\ a_{2j}\\ a_{3j}\\ a_{4j}\end{array}\right]=H_j{U}_j\left[\begin{array}{c}{d}_j\\ s_j\end{array}\right]+N_{\mathrm{noise}}$

In the following formula, Y _jBe j data symbolic vector on the time domain after the process IDFT conversion; H _jBe j equivalent channel on the time domain after the process IDFT conversion, H _jBe N _t* N _tThe matrix of dimension, H in the present embodiment _jIt is 4 * 4 matrix; U _jBe the pre-coding matrix that j time domain data symbol uses, if j=4, then according to the pre-coding matrix method of salary distribution of Fig. 3 end side that B is shown in, U in the present embodiment ₄=V ₂N _NoiseBe the noise of time domain, suppose that this noise is the Gaussian Profile of zero-mean, then noise variance can be designated as σ ²

According to the MMSE criterion, order

D then _jWith s _jEstimation

As shown in the formula:

$\left[\begin{array}{c}{\hat{d}}_j\\ {\hat{s}}_j\end{array}\right]={\stackrel{\&OverBar;}{H}}_j^H{({\stackrel{\&OverBar;}{H}}_j{\stackrel{\&OverBar;}{H}}_j^H+{\mathrm{\&sigma;}}^{2}I)}^{-1}{Y}_j$

In the following formula, what subscript H represented is conjugate transpose; What I represented is unit matrix.

Obtain through following formula

With

Be through the data symbol after the time domain detection, after the data symbol after time domain is detected carries out channel decoding, export two code word CW0 and CW1.

Corresponding with the embodiment of the application's method for transmitting uplink data, the application also provides the embodiment for the terminal of carrying out the upstream data transmission.

Referring to Fig. 6 A, be the embodiment block diagram of the application's terminal:

This terminal comprises: acquiring unit 610, precoding unit 620, DFT converter unit 630 and transmitting element 640.

Wherein, acquiring unit 610 is used for obtaining the data symbol that is mapped to after the modulation on the different transport layers;

Precoding unit 620, the data symbol that is used for described acquiring unit 610 is obtained adopts a plurality of pre-coding matrixes to carry out respectively precoding;

DFT converter unit 630 is used for the data symbol after described precoding unit 620 precodings is carried out the DFT conversion;

Transmitting element 640 is used for carrying out up transmission according to the data symbol after the described DFT converter unit 630DFT conversion.

Referring to Fig. 6 B, in one embodiment, acquiring unit 610 can comprise:

Code word mapping subelement 611 is used for that transmission block to be sent is carried out respectively code word and shines upon to obtain corresponding code word;

Coding scrambling subelement 612 is used for the code word after the mapping of described code word mapping subelement 611 code words is encoded and scrambling by channel independently;

Modulation subunit 613 is used for the code word after 612 scramblings of described coding scrambling subelement is modulated;

Transport layer mapping subelement 614 is used for the code word after described modulation subunit 613 modulation is mapped to different transport layers, and each code word correspondence mappings is one group of data symbol at least one transport layer.

Referring to Fig. 6 C, in one embodiment, precoding unit 620 can comprise:

Grouping subelement 621, the data symbol on all transport layers that are used for described acquiring unit 610 is obtained divides into groups, and each the group data symbol after the grouping comprises in all transport layers N continuous on each transport layer data symbol, and N is natural number;

Pre-coding matrix distributes subelement 622, is used to each the group data symbol after described grouping subelement 621 groupings to distribute a pre-coding matrix;

Precoding subelement 623 is used for the pre-coding matrix that each group data symbol adopts described pre-coding matrix to distribute subelement 622 to distribute is carried out precoding, the transmitting antenna that the data symbol after the precoding is corresponding different.

In one embodiment, DFT converter unit 630, concrete being used for carried out respectively the DFT conversion with the corresponding data symbol of each transmit antennas.

Referring to Fig. 6 D, in one embodiment, transmitting element 640 can comprise:

Resource mapping subelement 641 is used for the data symbol after the described DFT converter unit 630DFT conversion is carried out resource mapping;

Antenna sends subelement 642, is used for the antenna by correspondence after the process of the data symbol behind described resource mapping subelement 641 resource mappings IDFT conversion is sent.

As seen from the above-described embodiment, terminal is when carrying out the upstream data transmission, different data symbols is adopted a plurality of pre-coding matrixes, owing to be mapped to data symbol on the different transport layers and all be the symbol on the modulation constellation, therefore it is carried out carrying out first precoding before the DFT conversion, then the characteristic of the data symbol after the precoding can not change, data symbol after the precoding is carried out DFT conversion and IDFT conversion more then can keep data symbol to be always symbol on the modulation constellation, therefore can when a plurality of pre-coding matrixes of up employing carry out precoding, keep the CM characteristic of data symbol.

Referring to Fig. 7, be the embodiment block diagram of the application base station, this base station is used for the aforementioned upstream data symbol that the terminal of terminal embodiment is sent is processed:

This base station comprises: receiving element 710, converter unit 720, detecting unit 730, decoding unit 740 and output unit 750.

Wherein, receiving element 710 is used for the upstream data symbol that sends by the antenna reception terminal;

Converter unit 720 is used for the 710 described upstream data symbols that described receiving element receives are carried out conversion, obtains the time domain data symbol;

Detecting unit 730 is used for adopting a plurality of pre-coding matrixes to detect respectively to the time domain data symbol that described converter unit 720 obtains;

Decoding unit 740 is used for the data symbol after described detecting unit 730 detections is carried out channel decoding.

Output unit 750 is used for exporting corresponding code word after described decoding unit 740 channel decodings.

Referring to Fig. 7 B, in one embodiment, described converter unit 720 can comprise:

DFT varitron unit 721 is used for the upstream data symbol that described receiving element 710 receives is carried out the DFT conversion, obtains the frequency domain data symbol;

Frequency domain equalization subelement 722, the frequency domain data symbol that is used for described DFT varitron unit 721 is obtained is in the equilibrium of the enterprising line frequency of each subcarrier territory;

IDFT varitron unit 723 is used for the frequency domain data symbol behind frequency domain equalization subelement 722 frequency domain equalizations is carried out the IDFT conversion, obtains the time domain data symbol.

Referring to Fig. 7 C, in one embodiment, described detecting unit 730 can comprise:

Grouping subelement 731, be used for the time domain data symbol that described converter unit 720 obtains is divided into groups, each group time domain data symbol after the grouping comprises upper N the continuous data symbol of each IDFT after all IDFT conversion, described N is natural number, and the quantity of wherein said IDFT is consistent with the antenna amount of terminal;

Pre-coding matrix distributes subelement 732, is used to each the group data symbol after described grouping subelement 731 groupings to distribute a pre-coding matrix;

Detection sub-unit 733 is used for the pre-coding matrix that each group data symbol adopts described pre-coding matrix to distribute subelement 732 to distribute is detected the decoding channel that the data symbol after the detection is corresponding different.

By the embodiment of above-mentioned base station as seen, because end side is when carrying out the upstream data transmission, different data symbols is adopted a plurality of pre-coding matrixes, and carry out carrying out first precoding before the DFT conversion, therefore the characteristic of the data symbol after the precoding can not change, data symbol after the precoding is carried out DFT conversion and IDFT conversion again kept data symbol to be always symbol on the modulation constellation, therefore kept the CM characteristic of data symbol; Accordingly, at the base station side upstream data symbol of CM characteristic that received maintenance that terminal sends, according to the process of end side contrary, carry out first the IDFT conversion and then the data symbol detected, can improve thus the detection performance of base station, so that the code word accuracy of decoding output is higher.

The technology that those skilled in the art can be well understood in the embodiment of the invention can realize by the mode that software adds essential general hardware platform.Based on such understanding, the part that technical scheme in the embodiment of the invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product can be stored in the storage medium, such as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.

Each embodiment in this specification all adopts the mode of going forward one by one to describe, and identical similar part is mutually referring to getting final product between each embodiment, and each embodiment stresses is difference with other embodiment.Especially, for system embodiment because its basic simlarity is in embodiment of the method, thus describe fairly simple, relevant part gets final product referring to the part explanation of embodiment of the method.

Above-described embodiment of the present invention does not consist of the restriction to protection range of the present invention.Any modification of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.

Claims (16)

1. a method for transmitting uplink data is characterized in that, comprising:

Terminal is obtained the data symbol that is mapped to after the modulation on the different transport layers;

Adopt a plurality of pre-coding matrixes to carry out respectively precoding to described data symbol;

Data symbol after the described precoding is carried out discrete Fourier transform DFT conversion;

Carry out up transmission according to the data symbol after the described DFT conversion.

2. method according to claim 1 is characterized in that, the described data symbol that is mapped on the different transport layers after the modulation that obtains comprises:

Terminal is carried out respectively code word with transmission block to be sent and is shone upon to obtain corresponding code word;

Code word after the code word mapping is encoded and scrambling by channel independently;

Code word after the scrambling is modulated;

Code word after the modulation is mapped on the different transport layers, and each code word correspondence mappings is one group of data symbol at least one transport layer.

3. method according to claim 1 is characterized in that, describedly adopts a plurality of pre-coding matrixes to carry out respectively precoding to described data symbol to comprise:

Data symbol on all transport layers is divided into groups, and each the group data symbol after the grouping comprises in all transport layers N continuous on each transport layer data symbol, and described N is natural number;

For each group data symbol distributes a pre-coding matrix;

Adopt the pre-coding matrix that distributes to carry out precoding each group data symbol, the transmitting antenna that the data symbol after the precoding is corresponding different.

4. method according to claim 3 is characterized in that, describedly data symbol after the precoding is carried out the DFT conversion is specially: the corresponding data symbol of each transmit antennas is carried out respectively the DFT conversion.

5. method according to claim 1 is characterized in that, describedly carries out up transmission according to the data symbol after the described DFT conversion and comprises:

Data symbol after the DFT conversion is carried out resource mapping;

Antenna by correspondence after data symbol behind the resource mapping process IDFT conversion is sent.

6. a uplink data processing method is characterized in that, is used for the data symbol that method for transmitting uplink data as described in claim 1 to 5 any one sends is processed, and described method comprises:

The upstream data symbol that the base station sends by the antenna reception terminal;

Described upstream data symbol is carried out conversion, obtain the time domain data symbol;

Adopt a plurality of pre-coding matrixes to detect respectively to described time domain data symbol;

Data symbol after detecting through after the channel decoding, is exported corresponding code word.

7. method according to claim 6 is characterized in that, describedly described upstream data symbol is carried out conversion obtains the time domain data symbol and comprises:

Described upstream data symbol is carried out the DFT conversion, obtain the frequency domain data symbol;

Described frequency domain data symbol is balanced in the enterprising line frequency of each subcarrier territory;

Frequency domain data symbol behind the frequency domain equalization is carried out the IDFT conversion, obtain the time domain data symbol.

8. method according to claim 7 is characterized in that, a plurality of pre-coding matrixes of described employing are decoded to described time-domain signal and comprised:

Described time domain data symbol is divided into groups, each group time domain data symbol after the grouping comprises upper N the continuous data symbol of each inverse discrete Fourier transform IDFT after all IDFT conversion, described N is natural number, and the quantity of wherein said IDFT is consistent with the antenna amount of terminal;

For each group data symbol distributes a pre-coding matrix;

Adopt the pre-coding matrix that distributes to detect each group data symbol, the decoding channel that the data symbol after the detection is corresponding different.

9. a terminal is characterized in that, comprising:

Acquiring unit is used for obtaining the data symbol that is mapped to after the modulation on the different transport layers;

Precoding unit, the data symbol that is used for described acquiring unit is obtained adopts a plurality of pre-coding matrixes to carry out respectively precoding;

The DFT converter unit is used for the data symbol after the described precoding unit precoding is carried out the DFT conversion;

Transmitting element is used for carrying out up transmission according to the data symbol after the described DFT converter unit DFT conversion.

10. terminal according to claim 9 is characterized in that, described acquiring unit comprises:

Code word mapping subelement is used for that transmission block to be sent is carried out respectively code word and shines upon to obtain corresponding code word;

Coding scrambling subelement is used for the code word after the mapping of described code word mapping subelement code word is encoded and scrambling by channel independently;

Modulation subunit is used for the code word after the scrambling of described coding scrambling subelement is modulated;

Transport layer mapping subelement is used for the code word after the described modulation subunit modulation is mapped to different transport layers, and each code word correspondence mappings is one group of data symbol at least one transport layer.

11. terminal according to claim 9 is characterized in that, described precoding unit comprises:

The grouping subelement, the data symbol on all transport layers that are used for described acquiring unit is obtained divides into groups, and each the group data symbol after the grouping comprises in all transport layers N continuous on each transport layer data symbol, and described N is natural number;

Pre-coding matrix distributes subelement, is used to each the group data symbol after the described grouping subelement grouping to distribute a pre-coding matrix;

The precoding subelement is used for the pre-coding matrix that each group data symbol adopts described pre-coding matrix to distribute subelement to distribute is carried out precoding, the transmitting antenna that the data symbol after the precoding is corresponding different.

12. terminal according to claim 11 is characterized in that, described DFT converter unit, and concrete being used for carried out respectively the DFT conversion with the corresponding data symbol of each transmit antennas.

13. terminal according to claim 9 is characterized in that, described transmitting element comprises:

The resource mapping subelement is used for the data symbol after the described DFT converter unit DFT conversion is carried out resource mapping;

Antenna sends subelement, is used for the antenna by correspondence after the process of the data symbol behind the described resource mapping subelement resource mapping IDFT conversion is sent.

14. a base station is characterized in that, is used for the data symbol that terminal as described in claim 9 to 13 any one sends is processed, described base station comprises:

Receiving element is used for the upstream data symbol that sends by the antenna reception terminal;

Converter unit is used for the described upstream data symbol that described receiving element receives is carried out conversion, obtains the time domain data symbol;

Detecting unit is used for adopting a plurality of pre-coding matrixes to detect respectively to the time domain data symbol that described converter unit obtains;

Decoding unit is used for the data symbol after the described detecting unit detection is carried out channel decoding.

Output unit is used for exporting corresponding code word after the described decoding unit channel decoding.

15. base station according to claim 14 is characterized in that, described converter unit comprises:

DFT varitron unit is used for the upstream data symbol that described receiving element receives is carried out the DFT conversion, obtains the frequency domain data symbol;

The frequency domain equalization subelement, the described frequency domain data symbol that is used for described DFT varitron unit is obtained is in the equilibrium of the enterprising line frequency of each subcarrier territory;

IDFT varitron unit is used for the frequency domain data symbol behind the described frequency domain equalization subelement frequency domain equalization is carried out the IDFT conversion, obtains the time domain data symbol.

16. base station according to claim 14 is characterized in that, described detecting unit comprises:

The grouping subelement, be used for the time domain data symbol that described converter unit obtains is divided into groups, each group time domain data symbol after the grouping comprises upper N the continuous data symbol of each IDFT after all IDFT conversion, described N is natural number, and the quantity of wherein said IDFT is consistent with the antenna amount of terminal;

Pre-coding matrix distributes subelement, is used to each the group data symbol after the described grouping subelement grouping to distribute a pre-coding matrix;

Detection sub-unit is used for the pre-coding matrix that each group data symbol adopts described pre-coding matrix to distribute subelement to distribute is detected the decoding channel that the data symbol after the detection is corresponding different.

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