CN101873295B - Signal processing method and device as well as signal receiving method and receiving machine - Google Patents
Signal processing method and device as well as signal receiving method and receiving machine Download PDFInfo
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Abstract
The invention discloses a signal processing method and a device as well as a signal receiving method and a receiving machine in an orthogonal frequency division multiplexing system. A receiving terminal comprises more than two receiving antennas, the receiving terminal outputs more than two paths of data corresponding to the receiving antennas after executing the fast Fourier transformation processing, receiving pilot frequency is extracted by aiming at each path of data, cross correlation is carried out on the extracted receiving pilot frequency and the sending pilot frequency of expected users by aiming at each path of data, the cross correlation is carried out on the extracted receiving pilot frequency by aiming at every two paths of data; a merging weighting weight is determined by using the cross correlation results, and more than two paths of data are merged by using the merging weighting weight. When the invention is used, the co-channel interference can be inhabited in the processing process of the receiving terminal, the realization is easy, and in addition, the repressible co-channel interference number can not be limited by the number of the receiving antennas.
Description
Technical field
The present invention relates to OFDM (OFDM, Orthogonal Frequency DivisionMultiplexing) technology, the particularly signal processing method in the ofdm system and device and signal acceptance method and receiver.
Background technology
Ofdm system basic principle of the prior art is as follows: at transmitting terminal, and flow through string and be converted into a plurality of low speed sub data flows of high-speed data; Use these low speed sub data flows the frequency domain data symbol, utilize IFFT to modulate corresponding subcarrier, the composite signal of a plurality of modulated subcarriers is defined as an OFDM symbol; Carry out again parallel-serial conversion, and insert Cyclic Prefix (CP, Cyclic Prefix) between per two the OFDM symbols in the serial signal after conversion, to eliminate the interference between the subcarrier; Carry out at last launching after the digital-to-analogue conversion; At receiving terminal, carry out the operating process opposite with transmitting terminal.
For a plurality of residential quarters in the ofdm system, because be quadrature between each signal in the residential quarter, thus the problem of disturbing in the residential quarter well solved, but as cost, presence of intercell interference is more serious than code division multiple access (CDMA, Code-Division Multiple Access) system.
When linking when utilizing sky in the multiplexing many cell environments of frequency of utilization, because neighbor cell might use identical running time-frequency resource, link will be subjected to cochannel and disturb, and namely take the interference that forms between the user of identical running time-frequency resource.With the many output of single input (SIMO, Single input multiple output) link, be that to have transmitting antenna, a receiving terminal that two reception antennas are arranged be example to transmitting terminal, suppose to comprise among the A of residential quarter base station A and terminal A, terminal A is during to base station A transmitted signal, and the receiving terminal of base station A is considered as desired user with terminal A, comprises base station B and terminal B among the neighbor cell B, terminal B uses identical running time-frequency resource with terminal A, and the receiving terminal of base station A is considered as interference user with terminal B.Fig. 1 is the receiver principle block diagram in the ofdm system that use SIMO links in the prior art.
As shown in Figure 1, analog-to-digital conversion module carries out respectively analog-to-digital conversion to the two paths of signals that two reception antennas receive; Remove the CP module, for the two paths of signals of analog-to-digital conversion module output, remove respectively per two intersymbol CP of OFDM; The FFT module is carried out FFT to the two paths of signals after the removal CP resume module and is processed, and obtains two paths of data; Channel estimation module estimates respectively channel response for the two paths of data after the FFT processing; The frequency domain equalization module is carried out high specific according to channel estimating to the two-way receive data and is merged, and finishes the detection that receives signal; The demodulating and decoding module is carried out a series of processing such as demodulating and decoding to the signal after the detection of frequency domain equalization module, estimates transmitting of transmitting terminal.
In actual applications, two reception antennas of base station A will not only receive the signal that terminal A sends, also can receive the signal of the terminal B transmission of using identical running time-frequency resource among the B of residential quarter, at this moment terminal B is exactly interference user for terminal A, causes cochannel to disturb.
Can find out, receiver in the present ofdm system, not for the respective modules that suppresses the cochannel interference, the inhibition that cochannel disturbs mainly is to use for reference similar method in the cdma system, and soon the desired user of the interference user of neighbor cell and this residential quarter realizes that in the mode of multiple access space-time joint detects.On the one hand, the method that adopts space-time joint to detect, the principle that signal is processed during according to sky supposes that receiving terminal has n reception antenna, the number that the cochannel that can suppress disturbs is n-1, is subject to the restriction of reception antenna number, can not suppress all cochannels and disturb; On the other hand, need estimate the channel response of all interference users, this is very difficult.
Summary of the invention
The invention provides the signal processing method in a kind of ofdm system, the method can suppress cochannel in the processing procedure of receiving terminal disturbs, and realizes that simple and quenchable cochannel disturbs number not to be subjected to the restriction of reception antenna number.
The invention provides the signal acceptance method in a kind of ofdm system, the method can suppress cochannel and disturb in the processing procedure of receiving terminal, realize that simple and quenchable cochannel disturbs number not to be subjected to the restriction of reception antenna number, and reduce simultaneously difficulty and the amount of calculation of signal reception ﹠ disposal.
The invention provides the signal processing apparatus in a kind of ofdm system, this device can suppress cochannel in the processing procedure of receiving terminal disturbs, and realizes that simple and quenchable cochannel disturbs number not to be subjected to the restriction of reception antenna number.
The invention provides the receiver in a kind of ofdm system, this receiver can suppress cochannel in self processing procedure disturbs, realize that simple and quenchable cochannel disturbs number not to be subjected to the restriction of reception antenna number, and reduce simultaneously difficulty and the amount of calculation of signal reception ﹠ disposal.
Technical solution of the present invention is achieved in that
Signal processing method in a kind of ofdm system is applied to have in the ofdm system receiving terminal of two above reception antennas, and the FFT that described receiving terminal is carried out obtains the above data of two-way of corresponding reception antenna; Key is, the method comprises following combining step:
Extract the reception pilot tone for every circuit-switched data;
The reception pilot tone that to extract for every circuit-switched data and the transmission pilot tone of desired user are carried out cross-correlation;
Carry out cross-correlation for the reception pilot tone that every two paths of data will be extracted;
Utilize the result of cross-correlation to determine to merge the weighting weights;
Use the above data of the described described two-way of merging weighting weight number combining.
Signal acceptance method in a kind of ofdm system is carried out successively analog-to-digital conversion, is removed CP and FFT the signal that two above reception antennas receive, and exports the above data of two-way of corresponding reception antenna; Key is, the method also comprises:
Extract the reception pilot tone for every circuit-switched data;
The reception pilot tone that to extract for every circuit-switched data and the transmission pilot tone of desired user are carried out cross-correlation;
Carry out cross-correlation for the reception pilot tone that every two paths of data will be extracted;
Utilize the result of cross-correlation to determine to merge the weighting weights;
Use the above data of the described described two-way of merging weighting weight number combining;
Data after being combined are carried out channel estimating, frequency domain equalization and demodulating and decoding successively, estimate transmitting of desired user.
Signal processing apparatus in a kind of ofdm system is applied to have in the ofdm system receiving terminal of two above reception antennas, and the FFT module of described receiving terminal is exported the above data of two-way of corresponding reception antenna; Key is, this device comprises:
Pilot extraction unit is extracted the reception pilot tone for every circuit-switched data;
Cross-correlation unit, the reception pilot tone that will extract for every circuit-switched data and the transmission pilot tone of desired user are carried out cross-correlation; Carry out cross-correlation for the reception pilot tone that every two paths of data will be extracted;
Merge the weights determining unit, the result who utilizes cross-correlation unit to draw determines to merge the weighting weights;
The first merge cells uses the above data of the described described two-way of merging weighting weight number combining.
Receiver in a kind of ofdm system, key be, this receiver comprises: two above reception antennas, analog-to-digital conversion module, removal CP module, FFT module, signal processing apparatus, channel estimation module, frequency domain equalization module and demodulating and decoding modules;
Described analog-to-digital conversion module, the signal that respectively each reception antenna is received carries out analog-to-digital conversion;
Described removal CP module is removed respectively per two intersymbol Cyclic Prefix in every circuit-switched data of described analog-to-digital conversion module output;
Described FFT module is carried out FFT to every circuit-switched data of described removal CP module output respectively;
Described signal processing apparatus for every circuit-switched data of described FFT module output, extracts respectively and receives pilot tone; The reception pilot tone that to extract for every circuit-switched data of described FFT module output and the transmission pilot tone of desired user are carried out cross-correlation; Carry out cross-correlation for the reception pilot tone that every two paths of data of described FFT module output will be extracted; Utilize cross correlation results to determine to merge the weighting weights; Use the above data of two-way that merge the output of weighting weight number combining FFT module;
Described channel estimation module goes out channel response for data estimation after the merging of described signal processing apparatus output;
Described frequency domain equalization module, the channel estimating that draws according to the described channel estimation module data after to the merging of described signal processing apparatus output detect;
Described demodulating and decoding module is carried out demodulating and decoding to the data after the described frequency domain equalization module detection, estimates transmitting of desired user.
As seen, signal processing method in the ofdm system provided by the invention and device and signal acceptance method and receiver, receiving terminal possess two above reception antennas, and the FFT of receiving terminal process in the situation of the above data of two-way that obtain corresponding reception antenna, extract the reception pilot tone for every circuit-switched data, and the transmission pilot tone of the reception pilot tone that will extract and desired user is carried out cross-correlation, is reached the reception pilot tone of every two paths of data is carried out cross-correlation.Carry out cross-correlation and be exactly eliminating the difference between the transmitting of each circuit-switched data and desired user, therefore the merging weights that utilize cross correlation results to determine merge the data that, difference between itself and desired user transmit is minimum, namely in the merging processing procedure of receiving terminal, suppressed the cochannel interference, the space-time joint of realizing with multi-access mode in the prior art detects, need not to know any information of interference user, realize very simply, and quenchable cochannel disturbs number not to be subjected to the restriction of reception antenna number.Further, owing to before channel estimating and frequency domain equalization operation, the above frequency-region signal of two-way is merged, only need for a circuit-switched data when channel estimating and frequency domain equalization operation, reduced intractability and amount of calculation.
Description of drawings
Fig. 1 is the receiver principle block diagram in the ofdm system that use SIMO links in the prior art;
Fig. 2 is the flow chart of the signal processing method in the ofdm system of the present invention;
Fig. 3 is the flow chart of the embodiment of the signal processing method in the ofdm system of the present invention;
Fig. 4 is the structural representation of the signal processing apparatus in the ofdm system of the present invention;
Fig. 5 is the structural representation of the receiver in the ofdm system of the present invention.
Embodiment
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Before introducing in detail technical scheme of the present invention, briefly introduce first the auxiliary channel estimating of frequency pilot sign.Specifically, the transmitting terminal of ofdm system and receiving terminal arrange to send quantity and the position that pilot tone is inserted in advance in transmitted signal, in transmitting terminal one side, send pilot tone according to inserting in the approximately directed data to be sent, in receiving terminal one side, the correspondence position from receive signal extracts and receives pilot tone.
The interval of above-mentioned transmitting terminal pilots insertion is relevant with the coherence bandwidth of channel, coherence time and specific algorithm, and the placement of pilot tone must make channel estimating can catch up with the variation of channel response, and don't too much increases the expense of system.According to two-dimentional sampling thheorem, the interval of pilots insertion is subjected to the constraint of following condition.
f
DmaxT
OFDMΔ
T≤1/2；τ
maxΔfΔ
f＝τ
maxΔf/T
OFDM≤1/2。
Wherein, f
DmaxMaximum doppler frequency, τ
MaxThat maximum multipath postpones Δ f=1/T
OFDMSubcarrier spacing, Δ
T, Δ
fBe respectively the index interval of pilot tone on time and frequency, guarantee that by above-mentioned condition the interval of pilot tone on time and frequency is no more than respectively channel coherence bandwidth and coherence time.
Fig. 2 is the flow chart of the signal processing method in the ofdm system of the present invention, and this flow process is applied to have in the ofdm system receiving terminal of two above reception antennas, obtains the above data of two-way of corresponding reception antenna behind the receiving terminal execution FFT.Flow process shown in Figure 2 comprises:
Step 201: extract the reception pilot tone for every circuit-switched data.
Step 202: the reception pilot tone that will extract for every circuit-switched data and the transmission pilot tone of desired user are carried out cross-correlation.
In this step, the transmission pilot tone of desired user can be known according to agreement.
Step 203: carry out cross-correlation for the reception pilot tone that every two paths of data will be extracted.
Step 204: utilize the result who carries out cross-correlation to determine to merge the weighting weights.
Step 205: use the above data of the described described two-way of merging weighting weight number combining.
After step 205, if relate to the complete signal receiving course of receiving terminal in the ofdm system, the data that can be combined out are successively carried out channel estimating, frequency domain equalization and demodulating and decoding, estimate transmitting of desired user.
Further, reasonably compromise in order between amount of calculation and merging precision, to obtain, every circuit-switched data can be divided into N
RBThe basic resource blocks that individual size is identical, each basic resource blocks that is arranged in every circuit-switched data same position is one group.If RBi basic resource blocks of p circuit-switched data is expressed as
(p=1,2 ..., M
R, RBi=1,2 ..., N
RB), one
Comprise
Individual subcarrier and N
SymbolIndividual OFDM symbol, namely one
Comprise
Individual time frequency unit for example, just can adopt the data of a subframe of a Resource Block (RB) as a basic resource blocks in the up link of 3GPP LTE R8, namely one
In comprise 12 subcarriers and 14 OFDM symbols (being 12 OFDM symbols) when extended cyclic prefix.Accordingly, the transmitting data with desired user also is divided into N
RBThe basic resource blocks that individual size is identical.On this basis, above-mentioned steps 201～step 205 is carried out for current group of basic resource blocks from first group of basic resources BOB(beginning of block).Further comprise after the above-mentioned steps 205: judge that whether current group of basic resource blocks is last group basic resource blocks, if so, according to original time-frequency domain positional alignment, is combined into a circuit-switched data with corresponding each merging data piece of organizing basic resource blocks; Otherwise, next group basic resource blocks of current group of basic resource blocks as current group of basic resource blocks, is returned and is carried out described step 201.In the case, previously described channel estimating, frequency domain equalization and demodulating and decoding need described be combined into a circuit-switched data after again execution.
The below provides the specific embodiment of the signal processing method in the ofdm system of the present invention, in the present embodiment, and link when supposing the residential quarter use SIMO sky in the ofdm system.
Fig. 3 is the flow chart of the embodiment of the signal processing method in the ofdm system of the present invention, and this flow process comprises:
Step 301: from current group of basic resource blocks, extract and receive pilot tone.
In this step, from RBi basic resource blocks of p circuit-switched data
Middle extraction receives pilot tone, and arranged sequentially according to frequency after time after the first frequency or elder generation's time forms a vectorial P of row
(p), P
(p)Dimension be 1 * N
p, N
pBe RBi basic resource blocks in the p circuit-switched data
In the reception pilot number.Carry out the operation of said extracted pilot tone for each basic resource blocks in current group, obtain the pilot tone row vector of current group of basic resource blocks
Step 302: ask spatial correlation matrix for current group of basic resource blocks.
In this step, establish spatial correlation matrix C
RBiElement be
(i=1,2 ... M
R, j=1,2 ... M
R), the RB of this element representation i circuit-switched data
iThe reception pilot tone of individual basic resource blocks and the RB of j circuit-switched data
iThe cross correlation of the reception pilot tone of individual basic resource blocks, (.) wherein
HThe expression conjugate transpose.As seen, spatial correlation matrix C
RBiDimension be M
R* M
R, and according to its physical meaning C as can be known
RBi=(C
RBi)
H, therefore when calculating, actual needs to calculate C
RBiThe element of upper angular position gets final product, and has further saved amount of calculation.
Step 303: the spatial correlation matrix C that asks current group of basic resource blocks
RBiInverse matrix.
In this step, ask the spatial correlation matrix C of current group of basic resource blocks
RBiInverse matrix (C
RBi)
-1
Step 304: with the reception pilot tone of current group of basic resource blocks, carry out cross-correlation with the emission pilot tone in the corresponding basic resource blocks of desired user emission, calculate the pilot tone guiding vector
In this step,
In element calculate according to following formula:
(i=1,2 ..., M
R), wherein
RB for the desired user emission
iThe emission pilot tone row vector of individual basic resource blocks,
And P
(i)In respective element be identical in the position of time-frequency domain.
Dimension be M
R* 1,
The RB that represents the i circuit-switched data
iThe reception pilot tone of individual basic resource blocks, with the RB of desired user emission
iThe cross correlation of the emission pilot tone of individual basic resource blocks.
Step 305: determine to merge the weighting weights.
In this step, merge the weighting weight and determine according to following formula:
Wherein, W
RBiDimension be M
R* 1, its element is
(i=1 ..., M
R).
Step 306: merge the current group of data in the basic resource blocks.
In this step, merge and carry out according to following computing formula:
Step 307: judge that whether current group of basic resource blocks is last group basic resource blocks, if continue execution in step 308, otherwise returns execution in step 301.
For each group basic resource blocks, repeat above-mentioned steps 301～306, will obtain N
RBIndividual merging Resource Block, then execution in step 308.
Step 308: every group of basic resource blocks merged the merging data piece that according to original time-frequency domain positional alignment, obtain a circuit-switched data e.
After the step 308, a circuit-switched data that obtains is carried out channel estimating, frequency domain equalization and demodulating and decoding operation, processing when being equivalent to single single output of input (SISO, Single Input Single Output) link, intractability and complexity reduce greatly.
Although above-described embodiment is linked as example with SIMO, be understandable that the signal acceptance method in the ofdm system of the present invention also is applicable to other multiple-input and multiple-outputs (MIMO, Multiple InputMultiple Output) link.
Signal processing method provided by the invention can simply be called direct matrix in verse (DMI, DirectMatrix Inversion) method.
Signal processing method in the corresponding above-mentioned ofdm system, the present invention also provides the signal processing apparatus in a kind of ofdm system.
Fig. 4 is the structural representation of the signal processing apparatus in the ofdm system of the present invention, and this signal processing apparatus comprises: pilot extraction unit, cross-correlation unit, merging weights determining unit and the first merge cells.
Above-mentioned pilot extraction unit receives pilot tone for the signal extraction of every road.
Above-mentioned cross-correlation unit, the reception pilot tone that will extract for every circuit-switched data and the transmission pilot tone of desired user are carried out cross-correlation; Carry out cross-correlation for the reception pilot tone that every two paths of data will be extracted.
Above-mentioned merging weights determining unit, the result who utilizes cross-correlation unit to draw determines to merge the weighting weights.
Above-mentioned the first merge cells uses the above data of the described described two-way of merging weighting weight number combining.
Be the processing procedure that realizes carrying out take basic resource blocks as unit in the inventive method, pilot extraction unit in the said signal processing device, cross-correlation unit, merging weights determining unit and the first merge cells, need from first group of basic resources BOB(beginning of block), for current group of basic resource blocks executable operations, the first merge cells draws the merging data piece of corresponding current group of basic resource blocks.In this case, further comprise in the direct matrix in verse module: judging unit, draw the merging data piece of corresponding current group of basic resource blocks at the first merge cells after, judge whether current group of basic resource blocks is last group basic resource blocks, if, trigger the second merge cells executable operations, otherwise trigger described pilot extraction unit with current group of basic resource blocks next the group basic resource blocks as current basic resource blocks, redo; The second merge cells, the merging data piece of corresponding every group of basic resource blocks that the first merge cells is obtained is combined as a circuit-switched data according to original time-frequency domain positional alignment.
For realizing extracting in the inventive method the reception pilot tone in every group of basic resource blocks, above-mentioned pilot extraction unit comprises: extract subelement and ordering subelement.
The said extracted subelement is used for extracting the reception pilot tone from current group of basic resource blocks.
Above-mentioned ordering subelement, the reception pilot tone that described extraction subelement is extracted, arranged sequentially according to frequency after time after the first frequency or elder generation's time forms and receives pilot tone row vector P
(p)(p=1,2 ..., M
R).
For realizing two kinds of cross correlation process in the inventive method, above-mentioned cross-correlation unit comprises: the first cross-correlation subelement and the second cross-correlation subelement.
Above-mentioned the first cross-correlation subelement is with the reception pilot tone row of current group of basic resource blocks vector, vectorial with the emission pilot tone row in the corresponding basic resource blocks of desired user emission
Carry out cross-correlation, calculate the pilot tone guiding vector
Element in this pilot tone guiding vector is
(i=1,2 ..., M
R).
Above-mentioned the second cross-correlation subelement for current group of basic resource blocks, is obtained spatial correlation matrix C
RBi, the element in this spatial correlation matrix is
(i=1,2 ... M
R, j=1,2 ... M
R).
For realizing that the merging weighting weights in the inventive method determine, above-mentioned merging weights determining unit comprises: invert subelement and merge the weights computation subunit of space matrix.
The above-mentioned space matrix subelement of inverting is inverted to the spatial correlation matrix that described the second cross-correlation subelement draws, and obtains the inverse matrix (C of space matrix
RBi)
-1
Above-mentioned merging weights computation subunit is utilized the inverse matrix of described space matrix, calculates the current group of merging weighting weights that basic resource blocks is corresponding
The element that merges the weighting weights is
(i=1,2 ..., M
R).
For realizing processing for the merging of each group basic resource blocks in the inventive method, above-mentioned the first merge cells comprises: Matrix Conjugate transposition subelement and merging subelement.
Above-mentioned Matrix Conjugate transposition subelement, the merging weighting weights that described merging weights computation subunit is obtained carry out conjugate transpose.
Above-mentioned merging subelement, the result who utilizes described Matrix Conjugate transposition subelement to obtain merges into the merging data piece with the data in the current group of basic resource blocks
(RBi=1,2 ... N
RB).
Fig. 5 is the structural representation of the receiver in the ofdm system of the present invention, and this receiver comprises: two above reception antennas, analog-to-digital conversion module, removal CP module, FFT module, channel estimation module, frequency domain equalization module and demodulating and decoding modules.Receiver among the present invention also comprises: signal processing apparatus shown in Figure 4.
Identical in above-mentioned analog-to-digital conversion module, the function of removing CP module, FFT module and annexation and the prior art receiver; The internal structure of said signal processing device and function preamble describe in detail, repeat no more here; Above-mentioned channel estimation module, frequency domain equalization module and demodulating and decoding module only need for a circuit-switched data executable operations respectively.
Signal processing method in the ofdm system of the present invention and device and signal acceptance method and receiver, obtained following effect:
1) FFT being processed the rear multichannel data of exporting merges, owing to having utilized previously described cross-correlation operation when determining to merge the weighting weights, make the data and the difference between the desired user transmitting data that merge minimum, namely in the merging processing procedure of receiving terminal, suppressed the cochannel interference, need not to know any information of interference user, realize that simple and quenchable cochannel disturbs number not to be subjected to the restriction of reception antenna number, inhibition is also good than joint-detection of the prior art;
2) in the process that merges multichannel data, having set unit of account is basic resource blocks, has like this one well to trade off between merging precision and amount of calculation;
3) in the process that merges multichannel data, previously described cross-correlation calculation only relates to the reception pilot tone and sends pilot tone, and amount of calculation is little;
3) because the data after FFT processed just merge, follow-uply when carrying out channel estimating and frequency domain equalization etc. and process, only need for a circuit-switched data, reduce amount of calculation.
In sum, above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1. the signal processing method in the ofdm system is applied to have in the ofdm system receiving terminal of two above reception antennas, and the fast Fourier transform that described receiving terminal is carried out obtains the above data of two-way of corresponding reception antenna; It is characterized in that, the method comprises following combining step:
Extract the reception pilot tone for every circuit-switched data;
The reception pilot tone that to extract for every circuit-switched data and the transmission pilot tone of desired user are carried out cross-correlation;
Carry out cross-correlation for the reception pilot tone that every two paths of data will be extracted;
Utilize the result of cross-correlation to determine to merge the weighting weights
Wherein, W
RBiDimension be M
R* 1, its element is
I=1,2 ..., M
R, spatial correlation matrix C
RBiElement be
I=1,2 ... M
R, j=1,2 ... M
R, represent the cross correlation of reception pilot tone of RBi basic resource blocks of the reception pilot tone of RBi basic resource blocks of i circuit-switched data and j circuit-switched data, N
PBe the reception pilot number in each basic resource blocks, pilot tone guiding vector
Dimension be M
R* 1, its element is
I=1,2 ..., M
R,
For the emission pilot tone row of RBi basic resource blocks of desired user emission vectorial, P
(i)Be the reception pilot tone row vector of i circuit-switched data,
And P
(i)In respective element be identical in the position of time-frequency domain,
Represent RBi basic resource blocks of i circuit-switched data the reception pilot tone, with the cross correlation of the emission pilot tone of RBi basic resource blocks of desired user emission;
Use the above data of the described described two-way of merging weighting weight number combining.
2. the method for claim 1 is characterized in that, described every circuit-switched data comprises N
RBThe basic resource blocks that individual size is identical, each basic resource blocks that is positioned at same position is one group; Comprise in the signal of desired user emission with described every circuit-switched data in the basic resource blocks of same number and size;
Described combining step is carried out for current group of basic resource blocks, obtains corresponding current group merging data piece;
Further comprise after the described combining step: judge that whether current group of basic resource blocks is last group basic resource blocks, if so, according to original time-frequency domain positional alignment, is combined as a circuit-switched data with corresponding each merging data piece of organizing basic resource blocks; Otherwise, next group basic resource blocks of current group of basic resource blocks as current group of basic resource blocks, is returned and is carried out described combining step.
3. method as claimed in claim 2 is characterized in that, RBi the basic resource blocks of establishing the i circuit-switched data is expressed as
I=1,2 ..., M
R, RBi=1,2 ..., N
RB
The described extraction for every circuit-switched data receives pilot tone and is:
Extract to receive pilot tone from current group of basic resource blocks, arranged sequentially according to frequency after time after the first frequency or elder generation's time forms described reception pilot tone row vector P
(i)
4. method as claimed in claim 3 is characterized in that, the transmission pilot tone of the described reception pilot tone that will extract for every circuit-switched data and desired user is carried out cross-correlation and is:
With the reception pilot tone row of current group of basic resource blocks vector, with the basic resource blocks of the correspondence position of desired user emission in emission pilot tone row vector
Carry out cross-correlation, calculate described pilot tone guiding vector
5. method as claimed in claim 4 is characterized in that, the reception pilot tone that will extract for every two paths of data is carried out cross-correlation and is:
For current group of basic resource blocks, obtain spatial correlation matrix C
RBi
6. method as claimed in claim 5 is characterized in that, utilizes the described result who carries out cross-correlation to determine to merge the weighting weights to be:
Ask the current group of merging weighting weights that basic resource blocks is corresponding
7. method as claimed in claim 6 is characterized in that, the above data of the described two-way of the described merging weighting of described use weight number combining are:
Data in the current group of basic resource blocks are merged into a merging data piece
RBi=1,2 ... N
RB
8. the signal acceptance method in the ofdm system is carried out successively analog-to-digital conversion, is removed Cyclic Prefix and fast Fourier transform the signal that two above reception antennas receive, and exports the above data of two-way of corresponding reception antenna; It is characterized in that, the method also comprises:
Extract the reception pilot tone for every circuit-switched data;
The reception pilot tone that to extract for every circuit-switched data and the transmission pilot tone of desired user are carried out cross-correlation;
Carry out cross-correlation for the reception pilot tone that every two paths of data will be extracted;
Utilize the result of cross-correlation to determine to merge the weighting weights
Wherein, W
RBiDimension be M
R* 1, its element
I=1,2 ..., M
R, spatial correlation matrix C
RBiElement be
I=1,2 ... M
R, j=1,2 ... M
R, represent the cross correlation of reception pilot tone of RBi basic resource blocks of the reception pilot tone of RBi basic resource blocks of i circuit-switched data and j circuit-switched data, N
PBe the reception pilot number in each basic resource blocks, pilot tone guiding vector
Dimension be M
R* 1, its element is
I=1,2 ..., M
R,
For the emission pilot tone row of RBi basic resource blocks of desired user emission vectorial, P
(i)Be the reception pilot tone row vector of i circuit-switched data,
And P
(i)In respective element be identical in the position of time-frequency domain,
Represent RBi basic resource blocks of i circuit-switched data the reception pilot tone, with the cross correlation of the emission pilot tone of RBi basic resource blocks of desired user emission;
Use the above data of the described described two-way of merging weighting weight number combining;
Data after being combined are carried out channel estimating, frequency domain equalization and demodulating and decoding successively, estimate transmitting of desired user.
9. the signal processing apparatus in the ofdm system is applied to have in the ofdm system receiving terminal of two above reception antennas, and the fast Fourier transform module of described receiving terminal is exported the above data of two-way of corresponding reception antenna; It is characterized in that, this device comprises:
Pilot extraction unit is extracted the reception pilot tone for every circuit-switched data;
Cross-correlation unit, the reception pilot tone that will extract for every circuit-switched data and the transmission pilot tone of desired user are carried out cross-correlation; Carry out cross-correlation for the reception pilot tone that every two paths of data will be extracted;
Merge the weights determining unit, the result who utilizes cross-correlation unit to draw determines to merge the weighting weights
Wherein, W
RBiDimension be M
R* 1, its element
I=1,2 ..., M
R, spatial correlation matrix C
RBiElement be
I=1,2 ... M
R, j=1,2 ... M
R, represent the cross correlation of reception pilot tone of RBi basic resource blocks of the reception pilot tone of RBi basic resource blocks of i circuit-switched data and j circuit-switched data, N
PBe the reception pilot number in each basic resource blocks, pilot tone guiding vector
Dimension be M
R* 1, its element is
I=1,2 ..., M
R,
For the emission pilot tone row of RBi basic resource blocks of desired user emission vectorial, P
(i)Be the reception pilot tone row vector of i circuit-switched data,
And P
(i)In respective element be identical in the position of time-frequency domain,
Represent RBi basic resource blocks of i circuit-switched data the reception pilot tone, with the cross correlation of the emission pilot tone of RBi basic resource blocks of desired user emission;
The first merge cells uses the above data of the described described two-way of merging weighting weight number combining.
10. device as claimed in claim 9 is characterized in that, described every circuit-switched data includes N
RBThe basic resource blocks that individual size is identical, each basic resource blocks that is positioned at same position is one group; Comprise in the signal of desired user emission with described every circuit-switched data in the basic resource blocks of same number and size;
Described pilot extraction unit, cross-correlation unit, merging weights determining unit and the first merge cells, for current group of basic resource blocks executable operations, described the first merge cells draws the merging data piece of corresponding current group of basic resource blocks;
Further comprise in the described device:
Judging unit, draw the merging data piece of corresponding current group of basic resource blocks at the first merge cells after, judge whether current group of basic resource blocks is last group basic resource blocks, if, trigger the second merge cells executable operations, otherwise trigger described pilot extraction unit with current group of basic resource blocks next the group basic resource blocks as current basic resource blocks, redo;
The second merge cells, the merging data piece of corresponding every group of basic resource blocks that the first merge cells is obtained is combined as a circuit-switched data according to original time-frequency domain positional alignment.
11. device as claimed in claim 10 is characterized in that, RBi the basic resource blocks of establishing the i circuit-switched data is expressed as
I=1,2 ..., M
R, RBi=1,2 ..., N
RB
Described pilot extraction unit comprises:
Extract subelement, be used for extracting the reception pilot tone from current group of basic resource blocks;
The ordering subelement, the reception pilot tone that described extraction subelement is extracted, arranged sequentially according to frequency after time after the first frequency or elder generation's time forms described reception pilot tone row vector P
(i)
12. device as claimed in claim 11 is characterized in that, described cross-correlation unit comprises:
The first cross-correlation subelement is with the reception pilot tone row of current group of basic resource blocks vector, vectorial with the emission pilot tone row in the corresponding basic resource blocks of desired user emission
Carry out cross-correlation, calculate described pilot tone guiding vector
The second cross-correlation subelement for current group of basic resource blocks, is obtained spatial correlation matrix C
RBi
13. device as claimed in claim 12 is characterized in that, described merging weights determining unit comprises:
The space matrix subelement of inverting is inverted to the spatial correlation matrix that described the second cross-correlation subelement draws, and obtains the inverse matrix (C of space matrix
RBi)
-1
Merge the weights computation subunit, utilize the inverse matrix of described space matrix, calculate the current group of merging weighting weights that basic resource blocks is corresponding
14. device as claimed in claim 13 is characterized in that, described the first merge cells comprises:
Matrix Conjugate transposition subelement, the merging weighting weights that described merging weights computation subunit is obtained carry out conjugate transpose;
Merge subelement, the result who utilizes described Matrix Conjugate transposition subelement to obtain merges into one with the data in the current group of basic resource blocks and merges Resource Block
RBi=1,2 ... N
RB
15. the receiver in the ofdm system, it is characterized in that, this receiver comprises: two above reception antennas, analog-to-digital conversion module, removal cyclic prefix module, fast Fourier transform module, signal processing apparatus, channel estimation module, frequency domain equalization module and demodulating and decoding modules;
Described analog-to-digital conversion module, the signal that respectively each reception antenna is received carries out analog-to-digital conversion;
Described removal cyclic prefix module is removed respectively per two intersymbol Cyclic Prefix in every circuit-switched data of described analog-to-digital conversion module output;
Described fast Fourier transform module is carried out fast Fourier transform to every circuit-switched data of described removal cyclic prefix module output respectively;
Described signal processing apparatus for every circuit-switched data of described fast Fourier transform module output, extracts respectively and receives pilot tone; The reception pilot tone that to extract for every circuit-switched data of described Fourier transform module output and the transmission pilot tone of desired user are carried out cross-correlation; Carry out cross-correlation for the reception pilot tone that every two paths of data of described Fourier transform module output will be extracted; Utilize cross correlation results to determine to merge the weighting weights
Use the above data of two-way that merge the output of weighting weight number combining Fourier transform module; Wherein, W
RBiDimension be M
R* 1, its element
I=1,2 ..., M
R, spatial correlation matrix C
RBiElement be
I=1,2 ... M
R, j=1,2 ... M
R, represent the cross correlation of reception pilot tone of RBi basic resource blocks of the reception pilot tone of RBi basic resource blocks of i circuit-switched data and j circuit-switched data, N
PBe the reception pilot number in each basic resource blocks, pilot tone guiding vector
Dimension be M
R* 1, its element is
I=1,2 ..., M
R,
For the emission pilot tone row of RBi basic resource blocks of desired user emission vectorial, P
(i)Be the reception pilot tone row vector of i circuit-switched data,
And P
(i)In respective element be identical in the position of time-frequency domain,
Represent RBi basic resource blocks of i circuit-switched data the reception pilot tone, with the cross correlation of the emission pilot tone of RBi basic resource blocks of desired user emission;
Described channel estimation module goes out channel response for data estimation after the merging of described signal processing apparatus output;
Described frequency domain equalization module, the channel estimating that draws according to the described channel estimation module data after to the merging of described signal processing apparatus output detect;
Described demodulating and decoding module is carried out demodulating and decoding to the data after the described frequency domain equalization module detection, estimates transmitting of desired user.
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| CN102685060B (en) * | 2012-05-03 | 2014-12-31 | 新邮通信设备有限公司 | Multi-user multiple input multiple output (MIMO) receiving method and device for orthogonal frequency division multiplexing system |
| CN102710390B (en) * | 2012-05-03 | 2015-09-02 | 新邮通信设备有限公司 | The method and apparatus of precoding in a kind of multi-user MIMO system |
| CN103516639B (en) * | 2012-06-30 | 2016-12-21 | 华为技术有限公司 | Channel estimation methods, channel estimating apparatus and receiver |
| CN105024950B (en) * | 2014-04-16 | 2018-06-05 | 普天信息技术有限公司 | A kind of data detection method |
| CN106921422B (en) * | 2015-12-24 | 2021-05-07 | 上海诺基亚贝尔股份有限公司 | Method and system for channel estimation for hybrid beamforming in MMW channels |
| CN107566311B (en) * | 2017-07-31 | 2020-02-18 | 南京邮电大学 | Transmission method based on resource block filtering RB F-OFDM system |
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| CN1703841A (en) * | 2002-08-29 | 2005-11-30 | 美国博通公司 | Adaptive pilot interference cancellation in CDMA systems |
| CN1722718A (en) * | 2004-07-17 | 2006-01-18 | 中国科学技术大学 | A kind of frequency synchronization device of orthogonal frequency-division multiplex singal and method thereof |
| CN101079857A (en) * | 2006-05-25 | 2007-11-28 | 北京泰美世纪科技有限公司 | A carrier residual frequency deviation tracking method based on OFDM system |
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| CN1703841A (en) * | 2002-08-29 | 2005-11-30 | 美国博通公司 | Adaptive pilot interference cancellation in CDMA systems |
| CN1722718A (en) * | 2004-07-17 | 2006-01-18 | 中国科学技术大学 | A kind of frequency synchronization device of orthogonal frequency-division multiplex singal and method thereof |
| CN101079857A (en) * | 2006-05-25 | 2007-11-28 | 北京泰美世纪科技有限公司 | A carrier residual frequency deviation tracking method based on OFDM system |
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