CN101379748A - Method and apparatus for performing uplink transmission in a multiple-input multiple-output single carrier frequency division multiple access system - Google Patents
Method and apparatus for performing uplink transmission in a multiple-input multiple-output single carrier frequency division multiple access system Download PDFInfo
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Abstract
A method and apparatus for performing uplink transmission in a multiple-input multiple-output (MIMO) single carrier frequency division multiple access (SC-FDMA) system are disclosed. At a wireless transmit/receive unit (WTRU), input data is encoded and parsed into a plurality of data streams. After modulation and Fourier transform, one of transmit beamforming, space time coding (STC) and spatial multiplexing is selectively performed based on channel state information. Symbols are then mapped to subcarriers and transmitted via antennas. The STC may be space frequency block coding (SFBC) or space time block coding (STBC). Per antenna rate control may be performed on each data stream based on the channel state information. At a Node-B, MIMO decoding may be performed based on one of minimum mean square error (MMSE) decoding, MMSE-successive interference cancellation (SIC) decoding and maximum likelihood (ML) decoding. Space time decoding may be performed if STC is performed at the WTRU.
Description
Technical field
The present invention relates to wireless communication system.More particularly, the present invention relates to a kind of method and apparatus that in multiple-input and multiple-output (MIMO) single-carrier frequency division multiple access (SC-FDMA) system, is used to carry out ul transmissions.
Background technology
The developer of the third generation (3G) wireless communication system is considering the Long Term Evolution (LTE) of 3G system, to develop brand-new radio access network, have more high power capacity and better high data rate, low latency, packet-optimized, the improved system of coverage thereby provide.In order to realize these targets, propose SC-FDMA as the air interface that is used for carrying out ul transmissions, rather than use the code division multiple access (CDMA) that is currently applied to the 3G system at LTE.
Uplink transmission basically among the LTE is that the SC-FDMA with the equal power ratio of ebb (PARP) with Cyclic Prefix (CP) is transmitted as the basis, to realize between uplink users orthogonality and to enable effective frequency domain equalization at receiver one end.Centralized and distributed transmission all can be used to support frequency self-adaption and frequency diversity transmission.
What Fig. 1 showed is traditional subframe structure of proposing to be used to carry out ul transmissions in LTE.This subframe has comprised six long (LB) 1～6 and two short blocks (SB) 1 and 2.SB1 and SB2 are used to reference signal (pilot tone just), coherent demodulation and/or control or transfer of data.LB1～6 item are used to control and/or transfer of data.Minimum uplink Transmission Time Interval (TTI) equated with the duration of subframe.A plurality of subframes or time slot then can be connected into longer uplink TTI.MIMO is meant wireless transmission and reception programme type, in this type of scheme, has used more than one antenna at transmitter and receiver.Mimo system has utilized the advantage of space diversity or spatial reuse (SM) to improve signal to noise ratio (snr) and has increased throughput.Described MIMO has lot of advantages, and this improves comprising interference reduction, power system capacity in spectrum efficiency improvement, cell edge place bit rate and robustness raising, minizone and the sub-district and the average transmit power demand reduces.
Summary of the invention
The present invention relates to a kind of method and apparatus that in MIMO SC-FDMA system, is used to carry out ul transmissions.(WTRU) locates at wireless transmitter/receiver unit, and the input data are encoded and resolve to a plurality of data flow.After having implemented modulation and Fourier transform, carry out a kind of among transmit beam-forming, precoding, Space Time Coding (STC) and the SM selectively based on channel condition information.Then, symbol will be mapped to subcarrier, and transmits via a plurality of antennas.STC can be space frequency block coding (SFBC) or space-time block code (STBC).On each data flow, can carry out antenna rate controlled one by one based on channel condition information.At the Node B place, then can be, maximum likelihood (ML) is decoded or the similar senior receiver technology that is used for MIMO is carried out the MIMO decoding based on least mean-square error (MMSE) decoding, the continuous interference eliminated of MMSE-(SIC) decoding.If that carry out on WTRU is STC, decode in the time of can carrying out sky so.
Description of drawings
These preferred implementations provide as an example about understanding the present invention in more detail the description of preferred implementation from following, and are understood in conjunction with the accompanying drawings, wherein:
What Fig. 1 showed is the traditional subframe form that proposes for SC-FDMA in LTE;
Fig. 2 is the block diagram of the WTRU of configuration according to the present invention;
What Fig. 3 showed is to handle label according to emission of the present invention;
Fig. 4 is the block diagram of the Node B of configuration according to the present invention;
Fig. 5 is the block diagram of the WTRU of another execution mode configuration according to the present invention; And
Fig. 6 is that another enforcement side is the block diagram of the Node B of configuration according to the present invention.
Embodiment
The term of hereinafter quoting " WTRU " is including, but not limited to the subscriber equipment of subscriber equipment (UE), mobile radio station, fixing or moving user unit, beep-pager, cell phone, PDA(Personal Digital Assistant), computer or any other type that can work in wireless environment.The term of hereinafter quoting " Node B " including, but not limited to the base station, site controller, access point (AP) or the interface equipment of any other type that can in wireless environment, work.
Feature of the present invention both can be merged into integrated circuit (IC), also can be configured in the circuit that comprises the plurality of interconnected assembly.
The present invention is to provide the method for in MIMO SC-FDMA system, carrying out STC, SM or transmit beam-forming selectively for ul transmissions.Concerning STC, any type of STC is operable, this comprising STBC, SFBC, be used for four (4) individual transmitting antennas accurate quadrature Alamouti, the time contrary STBC (TR-STBC), cyclic delay diversity (CDD) or the like.Hereinafter, the present invention will be illustrated with reference to STBC and the SFBC as the representative example of STC scheme.SFBC to high time selectivity and low frequency optionally channel have higher restorability, STBC then can use under the very low situation of time selectivity.Because STC is (for example signal to noise ratio (snr)) that depends on channel condition with respect to the advantage of transmit beam-forming, so transmission mode (STC contrasts transmit beam-forming) is based on that appropriate channel is measured and selecteed.
Fig. 2 is the block diagram of the WTRU200 of configuration according to the present invention.WTRU200 comprises that channel encoder 202, rate-matched unit 204, space analysis device 206, a plurality of interleaver 208a～208n, a plurality of constellation mapping unit 210a～210n, a plurality of fast Fourier transform (FFT)s unit 212a～212n, a plurality of multiplexer 218a～218n, spatial transform unit 222, sub-carrier mapped unit 224, a plurality of contrary fast fourier transform (IFFT) unit 226a～226n, a plurality of CP insert unit 228a～228n and a plurality of antenna 230a～230n.Should be noted that the WTRU 200,500 among Fig. 2 and 4～6 and the configuration of Node B 400,600 provide as example rather than restriction, this processing can be carried out by more or less assembly, and processing sequence can exchange.
202 pairs of inputs of channel encoder data 201 are encoded.Adaptive modulation and coding (AMC) then is to use when can using any code rate and any encoding scheme.For example, code rate can be 1/2,1/3,1/5,3/4,5/6,8/9 or the like.This encoding scheme can be Turbo coding, convolutional encoding, block code, low-density checksum (LDPC) coding or the like.Coding back data 203 can be deleted surplus (puncture) by rate-matched unit 204.Replacedly, a plurality of input traffics can be carried out coding and be deleted surplus by a plurality of channel encoders and rate-matched unit.
Transmit beam-forming can use channel matrix decomposition method (for example singular value decomposition (SVD)), the method for precoding based on code book and index, SM method or similar approach.For example, in the precoding of having used SVD or the transmit beam-forming, channel matrix is to use SVD and is estimated and decompose, and the correct unusual vector that finally obtains or then be used to pre-coding matrix or beam shaping vector through the correct unusual vector that quantizes.In the precoding or transmit beam-forming used based on the method for code book and index, wherein will select to have the pre-coding matrix in the code book of the highest SNR, and will feed back the index that points to this pre-coding matrix.Except SNR, other are measured equally can be with the criterion that elects, for example mean square error (MSE), channel capacity, bit error rate (BER) (BER), BLER (block error rate) (BLER), throughput or the like.In SM, unit matrix uses (that is to say that for SM, actual is the precoding weighting that is not applied to antenna) as pre-coding matrix.SM is by the transparent support of transmit beam-forming framework (the nothing feedback (no-feedback) that only needs pre-coding matrix or beam shaping vector).Concerning the MMSE detector of low complex degree, the transmit beam-forming scheme can reach the Shannon limit on very high SNR.Because the emission on the WTRU 200 is handled, transmit beam-forming can be that cost reduces to minimum with needed transmitting power with very little additional feedback.
Then, the symbols streams 223a～223n that is handled by spatial transform unit 222 will be mapped to subcarrier by sub-carrier mapped unit 224.Described sub-carrier mapped can be distributed subcarriers mapping or centralized sub-carrier mapped.Then, data 225a～225n will be handled by IFFT unit 226a～226n after the sub-carrier mapped, and time domain data 227a～227n will be exported in this unit.CP inserts unit 228a～228n and adds CP to time domain data 227a～227n.Then, the time domain data 229a～229n that has a CP is transmitted via antenna 230a～230n.
WTRU 200 supports to have the single data stream (for example being used for SFBC) of single codeword and one or more streams or the code word with transmit beam-forming simultaneously.Code word can be considered to be with Cyclic Redundancy Check independently carries out independent channel coded data stream.Different code words is to use identical T/F-sign indicating number resource.
What Fig. 3 showed is to handle label according to emission of the present invention.Concerning transmit beam-forming, channel matrix is to use singular value decomposition (SVD) or the following decomposition of equivalent method:
H=UDV
HEquation (1)
The spatial alternation that is used for SM or transmit beam-forming then can be expressed as follows:
X=Ts equation (2)
Wherein matrix T is the generalized transform matrix.If what use is transmit beam-forming, transformation matrix T will be selected as the beam shaping matrix V so, and this matrix obtains from above-mentioned SVD computing and (that is to say, T=V).
If that usefulness is STC (just SFBC or STBC), the coded data that is used for SFBC or STBC so can be expressed as follows:
What wherein first and second of the above-mentioned matrix row were represented respectively is data behind SFBC that has carried out use Alamouti scheme or the coding that is used for antenna 1 and 2 after the STBC coding.When using SFBC, d
2nAnd d
2n+1The subcarrier 2n that is used for a pair of subcarrier and the data symbol of 2n+1 have been represented.When using STBC, d
2nAnd d
2n+1Two adjacent OFDM symbol 2n and 2n+1 have been represented.These two kinds of schemes all have identical efficient coding speed.
Fig. 4 is the block diagram of the Node B 400 of configuration according to the present invention.Node B 400 comprises that a plurality of antenna 402a～402n, a plurality of CP remove unit 404a～404n, a plurality of FFT unit 406a～406n, channel estimator 408, decoder (STD) 414, a plurality of IFFT unit 416a～416n, a plurality of demodulator 418a～418n, a plurality of deinterleaver 420a～420n, space were removed resolver 422, removed rate-matched unit 424 and decoder 426 when subcarrier removed map unit 410, MIMO decoder 412, sky.
CP removes unit 404a～404n and remove CP from the data flow 403a that the receives～403n that is received from each reception antenna 402a～402n.Remove the data flow 405a that receives～405n afterwards through CP and convert frequency domain data 407a～407n to by FFT unit 406a～406n.Channel estimator 408 uses conventional method and produce channel estimating 409 from frequency domain data 407a～407n.This channel estimating then is based on subcarrier execution one by one.Subcarrier goes map unit 410 to carry out.Then, data 411a～411n was handled by MIMO decoder 412 after subcarrier went to shine upon.
Wherein R receives processing array, R
SsAnd R
VvBe correlation matrix,
Then be to have comprised the efficient channel matrix that the V matrix acts on the effect of estimating channel response.
If on WTRU 200, used STC, STD 414 STC that will decode so.Utilize SFBC or the STBC of MMSE to be expressed as follows:
Wherein H estimates channel matrix.
Channel coefficients h in the channel matrix H
IjIt is channel response corresponding to transmitting antenna j and reception antenna i.
When SNR was very low, STC was better than transmit beam-forming.Especially, simulation result proves, when SNR is very low, uses STC to be better than transmit beam-forming.STC need not the channel condition information feedback, and implements also very simple.STBC can tackle steadily has optionally channel of high-frequency, and SFBC then can tackle the channel with high time selectivity steadily.SFBC can be decodable code ground in single symbol, and (for example by IP voice (VoIP)) is very favorable when needing low latency.Under the quasistatic condition, SFBC provides similar performance with STBC.
Decode (if having used STC) afterwards when having carried out MIMO decoding (if not using STC) or sky, decoding back data 413a～413n or 415a～415n are handled by IFFT unit 416a～416n, are used to convert to time domain data 417a～417n.Time domain data 417a～417n is then handled by demodulator 418a～418n, to produce bit stream 419a～419n.Bit stream 419a～419n is handled by deinterleaver 420a～420n, this processing be with Fig. 2 in the opposite operation of operation of interleaver 208a～208n of WTRU 200.The back bit stream 421a～421n that deinterleaves goes resolver 422 to merge by the space.Then, the bit stream 423 of merging is by going rate-matched unit 424 and decoder 426 to handle, with restore data 427.
Transmit beam-forming on the WTRU 200 needs CSI to calculate pre-coding matrix V.Node B 400,600 comprises channel state feedback unit (not shown), so that channel condition information is sent to WTRU.The feedback requirements of a plurality of antennas is that capacity then only can linear growth along with the product and the delay expansion of transmitting antenna with reception antenna quantity increases.Therefore, in order to reduce feedback requirements, can use Limited Feedback.For Limited Feedback, the most directly method is that channel vector quantizes (VQ).The code book of vector quantization can use interpolating method to construct.Calculating about the V matrix then needs eigen decomposition.In method for precoding, wherein can use feedback or quantification based on matrix.In this method for precoding, wherein will select the best pre-coding matrix in the code book, and will feed back the index that points to selected pre-coding matrix based on matrix.Described best pre-coding matrix is based on predetermined choice criteria and is determined, and wherein for example to be that maximum S R, high correlation or other are any appropriately measure this choice criteria.In order to reduce the computation requirement of WTRU, also can use precoding processing here through quantizing.
No matter obtaining the needed eigen decomposition of V matrix still is to carry out simultaneously on the two in WTRU 200, Node B 400, still is need be about the information of CSI on WTRU 200.If on Node B 400, carry out eigen decomposition, can further improve the estimation of the emission pre-coding matrix on the WTRU 200 by using CSI on the WTRU 200 so.
The sane feedback of space channel can be obtained by averaged on frequency.This method also can be called the statistics feedback.This statistics feedback can be average feedback or covariance feedback.Because covariance information averaged on subcarrier, so the feedback parameter of all subcarriers all is identical, and the average feedback then must be implemented at each independent subcarrier or subcarrier group.Thus, the latter needs more signaling consumption.Because channel can represent the statistics reciprocity for the covariance feedback, therefore the recessiveness feedback can be used for transmit beam-forming from WTRU 200.In addition, compare with each pre-subcarrier average feedback, also the susceptibility to feedback delay is lower for the covariance feedback.
Fig. 5 and Fig. 6 are the WTRU 500 of another execution mode configuration according to the present invention and the block diagram of Node B 600.What WTRU 500 and Node B 600 were implemented is the rate controlled of antenna one by one (PARC) that has or do not have transmit beam-forming, precoding or SM.
WTRU 500 comprises that space analysis device 502, a plurality of channel encoder 504a～504n, a plurality of rate-matched unit 506a～506b, a plurality of interleaver 508a～508n, a plurality of constellation mapping unit 510a～510n, a plurality of FFT unit 512a～512n, a plurality of multiplexer 518a～518n, spatial transform unit 522, sub-carrier mapped unit 524, a plurality of IFFT unit 526a～526n, a plurality of CP insert unit 528a～528n and a plurality of antenna 530a～530n.Should be noted that, the configuration of WTRU 500 as an example rather than restriction provide, described processing can be carried out by more or less assembly, and the order of handling also can exchange.
Preferably, interweave by interleaver 508a～508n execution through data 507a～507n behind the coding after the rate-matched.Then, interweaving afterwards, data bit 509a～509n becomes symbol 511a～511n by constellation mapping unit 510a～510n according to selected modulation.Described modulation scheme can be BPSK, QPSK, 8PSK, 16QAM, 64QAM or similar modulation scheme.Symbol 511a～511n on each data flow is handled by FFT unit 512a～512n, wherein this unit output frequency domain data 513a～513n.Multiplexer 518a～518n is mutually multiplexing with frequency domain data 513a～513n with control data 514a～514n and/or pilot tone 516a～516n.This frequency domain data 519a～519n (has comprised control data 514a～514n after multiplexing and/or pilot tone 516a～516n) then handled by spatial transform unit 522.
Transmit beam-forming can by use channel matrix decomposition method (for example SVD), based on code book and index method for precoding, SM method and similarly method be performed.For instance, in the precoding of having used SVD or transmit beam-forming, channel matrix is to use SVD and is estimated and decompose, and the correct unusual vector that finally obtains or will be used to pre-coding matrix or beam shaping vector through the correct unusual vector that quantizes.In the precoding or transmit beam-forming used based on the method for code book and index, will select to have the pre-coding matrix in the code book of the highest SNR, and will feed back the index that points to this pre-coding matrix.Except SNR, other are measured equally can be used as choice criteria, for example MSE, channel capacity, BER, BLER, throughput or the like.In SM, the applying unit matrix is as pre-coding matrix (that is to say that for SM, actual is not apply the precoding weighting to antenna).SM is by the transparent support of transmit beam-forming framework (the nothing feedback that only needs pre-coding matrix or beam shaping vector).Concerning the MMSE detector of low complex degree, the transmit beam-forming scheme can reach the Shannon limit on very high SNR.Because the emission of WTRU 500 is handled, transmit beam-forming can be a cost and needed transmitting power is reduced to minimum with a small amount of additional feedback.
Then, the symbols streams 523a～523n that is handled by spatial transform unit 522 will be mapped to subcarrier by sub-carrier mapped unit 524.Described sub-carrier mapped can be distributed subcarriers mapping or centralized sub-carrier mapped.Then, data 525a～525n will be handled by IFFT unit 526a～526n after the sub-carrier mapped, and that this unit is exported then is time domain data 527a～527n.CP inserts unit 528a～528n and adds CP to each time domain data 527a～527n.Then, the time domain data 529a～529n with CP will be transmitted via a plurality of antenna 530a～530n.
Node B 600 comprises that a plurality of antenna 602a～602n, a plurality of CP remove unit 604a～604n, a plurality of FFT unit 606a～606n, channel estimator 608, subcarrier goes to map unit 610, MIMO decoder 612, STD 614, a plurality of IFFT unit 616a～616n, a plurality of demodulator 618a～618n, a plurality of deinterleaver 620a～620n, a plurality of rate-matched unit 622a～622n, a plurality of decoder 624a～624n and space gone to remove resolver 626.
CP removes unit 604a～604n and remove CP from the data flow 603a that the receives～603n that is received from each reception antenna 602a～602n.The data flow 605a that the receives～605n that removes through CP is converted into frequency domain data 607a～607n by FFT unit 606a～606n.Channel estimator 608 uses conventional method and produce channel estimating 609 from frequency domain data 607a～607n.This channel estimating is based on one by one, and subcarrier is performed.Subcarrier goes the opposite operation of operation that is and carries out of map unit 610 execution on the WTRU 500 of Fig. 5.Then, data 611a～611n was handled by MIMO decoder 612 after subcarrier went to shine upon.
Carry out MIMO decoding (if not using STC) or carrying out empty time decoding (if having used STC), IFFT unit 616a～616n will handle decode back data 613a～613n or 615a～615n so, is used to convert to time domain data 617a～617n.This time domain data 617a～617n is handled by demodulator 618a～618n, to produce bit stream 619a～619n.Described bit stream 619a～619n is then handled by deinterleaver 620a～620n, and wherein the operation of the interleaver 508a～508n of the WTRU 500 among this processing and Fig. 5 is opposite.Then, each back bit stream 621a～621n that deinterleaves will go rate-matched unit 624a～624n to handle by each.Bit stream 623a～623n is then decoded by decoder 624a～624n after going rate-matched.Decoding back bit 625a～625n then goes resolver 626 to merge by the space, with restore data 627.
Embodiment
1. method that in wireless communication system, is used to carry out ul transmissions.
2. as embodiment 1 described method, may further comprise the steps: produce a plurality of codings back data flow.
3. as embodiment 2 described methods, may further comprise the steps: from each coding back data flow, produce symbol sebolic addressing according to selected modulation scheme.
4. as embodiment 3 described methods, may further comprise the steps: each symbol sebolic addressing is carried out Fourier transform, to produce frequency domain data.
5. as embodiment 4 described methods, may further comprise the steps: come selectively frequency domain data is carried out a kind of in transmit beam-forming, precoding, STC and the spatial reuse based on channel condition information.
6. as embodiment 5 described methods, may further comprise the steps: the sign map on each symbol sebolic addressing is arrived subcarrier.
7. as embodiment 6 described methods, may further comprise the steps: data after the sub-carrier mapped on each symbol sebolic addressing are carried out inverse Fourier transform, to produce time domain data.
8. as embodiment 7 described methods, may further comprise the steps: launch described time domain data.
9. as the described method of arbitrary embodiment among the embodiment 5～8, wherein STC is one among SFBC, STBC, accurate quadrature Alamouti coding, TR-STBC and the CDD.
10. as the described method of arbitrary embodiment among the embodiment 5～9, wherein channel condition information is at least one in channel impulse response, pre-coding matrix, SNR, channel matrix rank, channel condition numbering, delay expansion, WTRU speed and the channel statistical.
11. it is, further comprising the steps of: as on each coding back data flow, to delete surplusly, be used for rate-matched as the described method of arbitrary embodiment among the embodiment 2～10.
12. it is, further comprising the steps of: that the bit execution on each coding back data flow is interweaved as the described method of arbitrary embodiment among the embodiment 2～11.
13. as the described method of arbitrary embodiment among the embodiment 5～12, wherein the antenna rate controlled is based on channel condition information and carries out on data flow behind the coding one by one.
14. as the described method of arbitrary embodiment among the embodiment 5～13, wherein transmit beam-forming has been to use the emission intrinsic beam shaping of channel matrix decomposition.
15. as the described method of arbitrary embodiment among the embodiment 5～13, wherein transmit beam-forming is to use and carries out based on the precoding of code book and index.
16. as the described method of arbitrary embodiment among the embodiment 5～13, wherein transmit beam-forming is to use and carries out based on the beam shaping of guiding vector.
17. it is, further comprising the steps of: that control data is mutually multiplexing with frequency domain data with pilot tone as the described method of arbitrary embodiment among the embodiment 4～16.
18. as the described method of arbitrary embodiment among the embodiment 1～17, wherein this wireless communication system is a MIMO SC-FDMA system.
19. it is, further comprising the steps of: as to receive described time domain data as the described method of arbitrary embodiment among the embodiment 8～18.
20., may further comprise the steps: the time domain data that receives is carried out Fourier transform, the frequency domain data that receives with generation as embodiment 19 described methods.
21., may further comprise the steps: carry out subcarrier and go mapping as embodiment 20 described methods.
22., may further comprise the steps: produce channel estimating as embodiment 21 described methods.
23., may further comprise the steps: the subcarrier that receives is gone to shine upon the back data carry out decoding based on channel estimating as embodiment 22 described methods.
24., may further comprise the steps: the decoded subcarrier that receives is gone to shine upon the back data carry out inverse Fourier transform as embodiment 23 described methods.
25., may further comprise the steps: carry out the demodulation sign indicating number as embodiment 24 described methods.
26. as the described method of arbitrary embodiment among the embodiment 23～25, one during wherein decoding is based on the MMSE decoding, MMSE-SIC decodes and ML decodes carried out.
27. it is, further comprising the steps of: as, then to carry out decoding when empty if what carry out for transmission is Space Time Coding as the described method of arbitrary embodiment among the embodiment 23～26.
28. as the described method of arbitrary embodiment among the embodiment 22～27, wherein channel condition information is from the equity side's feedback of communicating by letter.
29. as embodiment 28 described methods, wherein Limited Feedback is used to the channel condition information feedback.
30. as embodiment 28 described methods, wherein channel VQ is used to the channel condition information feedback.
31. as embodiment 28 described methods, wherein in communication equity side, carry out the eigen decomposition of channel matrix, with feedback V matrix.
32. as embodiment 28 described methods, wherein the statistics feedback is used to the channel condition information feedback.
33. as embodiment 32 described methods, wherein one of average feedback and covariance feedback are used to the channel condition information feedback.
34. WTRU who in MIMO SC-FDMA wireless communication system, is used to carry out ul transmissions.
35. as embodiment 34 described WTRU, comprising: encoder is used for coded input data.
36. as embodiment 35 described WTRU, comprising: the constellation mapping unit is used for producing symbol sebolic addressing according to selected modulation scheme from each coding back data flow.
37. as embodiment 36 described WTRU, comprising: Fourier transform unit is used for each symbol sebolic addressing is carried out Fourier transform, to produce frequency domain data.
38. as embodiment 37 described WTRU, comprising: spatial transform unit is used for selectively frequency domain data being carried out a kind of of transmit beam-forming, precoding, STC and spatial reuse based on channel condition information.
39. as embodiment 38 described WTRU, comprising: the sub-carrier mapped unit is used for the output of spatial transform unit is mapped to subcarrier.
40. as embodiment 39 described WTRU, comprising: the inverse Fourier transform unit is used for data after the sub-carrier mapped are carried out inverse Fourier transform, to produce time domain data.
41. as embodiment 40 described WTRU, comprising: a plurality of antennas are used to launch described time domain data.
42. as the described WTRU of arbitrary embodiment among the embodiment 38～41, wherein spatial transform unit is configured to carry out at least one among SFBC, STBC, accurate quadrature Alamouti coding, TR-STBC and the CDD.
43. as the described WTRU of arbitrary embodiment among the embodiment 38～42, wherein channel condition information is at least one in channel impulse response, pre-coding matrix, SNR, channel matrix rank, channel condition numbering, delay expansion, WTRU speed and the channel statistical.
44. as the described WTRU of arbitrary embodiment among the embodiment 35～43, also comprise: the space analysis device is used for producing a plurality of codings back data flow from the back input data of encoding.
45., also comprise as the described WTRU of arbitrary embodiment among the embodiment 35～44: the space analysis device, be used to produce a plurality of input traffics, wherein each input traffic is all by encoder encodes.
46., also comprise as the described WTRU of arbitrary embodiment among the embodiment 35～45: the rate-matched unit, be used for each coding back data flow is deleted surplus, be used for rate-matched.
47., also comprise: interleaver, the bit on each coding back data flow that is used to interweave as the described WTRU of arbitrary embodiment among the embodiment 35～46.
48. as the described WTRU of arbitrary embodiment among the embodiment 42～47, wherein spatial transform unit is configured to come the back data flow of encoding is carried out antenna rate controlled one by one based on channel condition information.
49. as the described WTRU of arbitrary embodiment among the embodiment 42～48, wherein spatial transform unit is configured to use channel matrix decomposition to carry out transmit beam-forming.
50. as the described WTRU of arbitrary embodiment among the embodiment 42～49, wherein spatial transform unit is configured to use the precoding based on code book and index to carry out transmit beam-forming.
51. as the described WTRU of arbitrary embodiment among the embodiment 42～50, wherein spatial transform unit is configured to use the beam shaping based on the guiding vector to carry out transmit beam-forming.
52. as the described WTRU of arbitrary embodiment among the embodiment 37～51, also comprise: multiplexer is used for control data mutually multiplexing with frequency domain data with pilot tone.
53. as the described WTRU of arbitrary embodiment among the embodiment 38～52, wherein channel condition information obtains from Node B.
54. Node B that in MIMO SC-FDMA wireless communication system, is used for the support uplink transmission.
55. as embodiment 54 described Node B, comprising: a plurality of antennas are used to receive data.
56. as embodiment 55 described Node B, comprising: Fourier transform unit is used for the data that receive are carried out Fourier transform, to produce frequency domain data.
57. as embodiment 56 described Node B, comprising: subcarrier goes map unit, is used for that frequency domain data is carried out subcarrier and goes mapping.
58. as the described Node B of arbitrary embodiment among the embodiment 54～57, comprising: channel estimator is used to produce channel estimating.
59. as embodiment 58 described Node B, comprising: the MIMO decoder is used for based on channel estimating subcarrier being removed to shine upon frequency domain data afterwards and carries out the MIMO decoding.
60. as embodiment 59 described Node B, comprising: the inverse Fourier transform unit is used for inverse Fourier transform is carried out in the output of MIMO decoder, to produce time domain data.
61. as embodiment 60 described Node B, comprising: demodulator is used for this time domain data is carried out demodulation, to produce data after demodulating.
62. as embodiment 61 described Node B, comprising: decoder is used for data after demodulating is decoded.
63. as the described Node B of arbitrary embodiment among the embodiment 59～62, wherein the MIMO decoder is configured to carry out the MIMO decoding based on one in MMSE decoding, MMSE-SIC decoding and the ML decoding.
64., also comprise as the described Node B of arbitrary embodiment among the embodiment 59～62: decoder when empty, decode when being used to carry out sky.
65. as the described Node B of arbitrary embodiment among the embodiment 58～64, also comprise: the channel state feedback unit is used for to WTRU transmitting channel state information.
66. as embodiment 65 described Node B, wherein Limited Feedback is used to the channel condition information feedback.
67. as embodiment 65 described Node B, wherein channel VQ is used to the channel condition information feedback.
68. as embodiment 65 described Node B, wherein the statistics feedback is used to the channel condition information feedback.
69. as embodiment 68 described Node B, wherein one of average feedback and covariance feedback are used to the channel condition information feedback.
Though feature of the present invention and element are described with specific combination in preferred embodiment, but each feature or element can be under the situation of other features that do not have described preferred implementation and element use separately, or with or with under the various situations that other features of the present invention and element combine do not use.Method provided by the invention or flow chart can be at the computer programs of being carried out by all-purpose computer or processor, implement in software or the firmware, wherein said computer program, software or firmware are to be included in the computer-readable recording medium in tangible mode, comprise read-only memory (ROM) about the example of computer-readable recording medium, random-access memory (ram), register, buffer storage, semiconductor memory apparatus, magnetizing mediums such as internal hard drive and moveable magnetic disc, magnet-optical medium and the light medium such as CD-ROM video disc and digital versatile disc (DVD).
For instance, appropriate processor comprises: general processor, application specific processor, conventional processors, digital signal processor (DSP), a plurality of microprocessor, the one or more microprocessors that are associated with the DSP core, controller, microcontroller, application-specific integrated circuit (ASIC) (ASIC), field programmable gate array (FPGA) circuit, other any integrated circuit and/or state machines.
The processor relevant with software can be used for realizing radio-frequency (RF) transceiver, so that used in WTRU, subscriber equipment, terminal, base station, radio network controller or any host computer.WTRU can be used in combination with the module that adopts hardware and/or form of software to implement, for example camera, camara module, video circuit, speaker-phone, vibratory equipment, loud speaker, microphone, TV transceiver, Earphone with microphone, keyboard, bluetooth module, frequency modulation (FM) radio unit, LCD (LCD) display unit, Organic Light Emitting Diode (OLED) display unit, digital music player, media player, video game machine module, explorer and/or any wireless lan (wlan) module.
Claims (41)
1. method that is used for carrying out ul transmissions at wireless communication system, this method comprises:
Produce a plurality of codings back data flow;
From each coding back data flow, produce symbol sebolic addressing according to selected modulation scheme;
Each symbol sebolic addressing is carried out Fourier transform, to produce frequency domain data;
Come selectively frequency domain data is carried out a kind of in transmit beam-forming, precoding, Space Time Coding (STC) and the spatial reuse based on channel condition information;
Sign map on each symbol sebolic addressing is arrived subcarrier;
Data after the sub-carrier mapped on each symbol sebolic addressing are carried out inverse Fourier transform, to produce time domain data; And
Launch described time domain data.
2. method according to claim 1, wherein said STC be space frequency block coding (SFBC), space-time block code (STBC), accurate quadrature Alamouti coding, the time one in contrary STBC (TR-STBC) and the cyclic delay diversity (CDD).
3. method according to claim 1, wherein said channel condition information are at least one in channel impulse response, pre-coding matrix, signal to noise ratio (snr), channel matrix rank, channel condition numbering, delay expansion, wireless transmitter/receiver unit (WTRU) speed and the channel statistical.
4. method according to claim 1 also comprises:
Each coding back data flow is deleted surplus, to be used for rate-matched.
5. method according to claim 1 also comprises:
Bit execution on each coding back data flow is interweaved.
6. method according to claim 1, wherein the antenna rate controlled is based on described channel condition information and carries out on data flow behind the coding one by one.
7. method according to claim 1, wherein said transmit beam-forming have been to use the emission intrinsic beam shaping of channel matrix decomposition.
8. method according to claim 1, wherein said transmit beam-forming is to use based on the precoding of code book and index and carries out.
9. method according to claim 1, wherein said transmit beam-forming are to use based on the beam shaping of guiding vector and carry out.
10. method according to claim 1 also comprises:
Control data is mutually multiplexing with described frequency domain data with pilot tone.
11. method according to claim 1, wherein said wireless communication system are multiple-input and multiple-output (MIMO) single-carrier frequency division multiple access (SC-FDMA) systems.
12. method according to claim 1 also comprises:
Receive described time domain data;
The time domain data that receives is carried out Fourier transform, the frequency domain data that receives with generation;
Carry out subcarrier and go mapping;
Produce channel estimating;
Based on described channel estimating the subcarrier that receives is gone to shine upon the back data and carry out decoding;
The decoded subcarrier that receives is gone to shine upon the back data carry out inverse Fourier transform; And
Carry out the demodulation sign indicating number.
13. one during method according to claim 12, wherein said decoding are based on least mean-square error (MMSE) decoding, the continuous interference eliminated of MMSE-(SIC) is decoded and maximum likelihood (ML) is decoded carried out.
14. method according to claim 12 also comprises:
If for what transmit execution is Space Time Coding, decoding when then carrying out sky.
15. method according to claim 1, wherein said channel condition information is from the equity side's feedback of communicating by letter.
16. method according to claim 15, wherein Limited Feedback is used to the channel condition information feedback.
17. method according to claim 16, wherein channel vector quantification (VQ) is used to the channel condition information feedback.
18. method according to claim 15, the eigen decomposition of execution channel matrix in communication equity side wherein is to feed back the V matrix.
19. method according to claim 15, wherein the statistics feedback is used to the channel condition information feedback.
20. method according to claim 19, wherein one of average feedback and covariance feedback are used to the channel condition information feedback.
21. a wireless transmitter/receiver unit (WTRU) that is used to carry out ul transmissions in multiple-input and multiple-output (MIMO) single-carrier frequency division multiple access (SC-FDMA) wireless communication system, this WTRU comprises:
Encoder is used for coded input data;
The constellation mapping unit is used for producing symbol sebolic addressing according to selected modulation scheme from each coding back data flow;
Fourier transform unit is used for each symbol sebolic addressing is carried out Fourier transform, to produce frequency domain data;
Spatial transform unit is used for selectively described frequency domain data being carried out a kind of of transmit beam-forming, precoding, Space Time Coding (STC) and spatial reuse based on channel condition information;
The sub-carrier mapped unit is used for the output of described spatial transform unit is mapped to subcarrier;
The inverse Fourier transform unit is used for data after the sub-carrier mapped are carried out inverse Fourier transform, to produce time domain data; And
A plurality of antennas are used to launch described time domain data.
22. WTRU according to claim 21, wherein said spatial transform unit be configured to carry out space frequency block coding (SFBC), space-time block code (STBC), accurate quadrature Alamouti coding, the time in contrary STBC (TR-STBC) and the cyclic delay diversity (CDD) at least one.
23. WTRU according to claim 21, wherein said channel condition information are in channel impulse response, pre-coding matrix, signal to noise ratio (snr), channel matrix rank, channel condition numbering, delay expansion, wireless transmitter/receiver unit (WTRU) speed and the channel statistical at least one.
24. WTRU according to claim 21 also comprises:
The space analysis device is used for producing a plurality of codings back data flow from the back input data of encoding.
25. WTRU according to claim 21 also comprises:
The space analysis device is used to produce a plurality of input traffics, and wherein each input traffic is all by described encoder encodes.
26. WTRU according to claim 21 also comprises:
The rate-matched unit, be used for each coding back data flow is deleted surplus, to be used for rate-matched.
27. WTRU according to claim 21 also comprises:
Interleaver, the bit on each coding back data flow that is used to interweave.
28. WTRU according to claim 21, wherein said spatial transform unit is configured to come the back data flow of encoding is carried out antenna rate controlled one by one based on described channel condition information.
29. WTRU according to claim 21, wherein said spatial transform unit is configured to use channel matrix decomposition to carry out described transmit beam-forming.
30. WTRU according to claim 21, wherein said spatial transform unit is configured to use based on the precoding of code book and index carries out described transmit beam-forming.
31. WTRU according to claim 21, wherein said spatial transform unit is configured to use the beam shaping based on the guiding vector to carry out described transmit beam-forming.
32. WTRU according to claim 21 also comprises:
Multiplexer is used for control data mutually multiplexing with described frequency domain data with pilot tone.
33. WTRU according to claim 21, wherein said channel condition information obtains from described Node B.
34. a Node B that is used for the support uplink transmission in multiple-input and multiple-output (MIMO) single-carrier frequency division multiple access (SC-FDMA) system, this Node B comprises:
A plurality of antennas are used to receive data;
Fourier transform unit is used for the data that receive are carried out Fourier transform, to produce frequency domain data;
Subcarrier goes map unit, is used for that described frequency domain data is carried out subcarrier and goes mapping;
Channel estimator is used to produce channel estimating;
The MIMO decoder is used for coming that based on described channel estimating subcarrier is removed to shine upon frequency domain data afterwards and carries out the MIMO decoding;
The inverse Fourier transform unit is used for inverse Fourier transform is carried out in the output of described MIMO decoder, to produce time domain data;
Demodulator is used for described time domain data is carried out demodulation, to produce data after demodulating; And
Decoder is used for described data after demodulating is decoded.
35. Node B according to claim 34, wherein said MIMO decoder are configured to carry out the MIMO decoding based on one in least mean-square error (MMSE) decoding, the continuous interference eliminated of MMSE-(SIC) decoding and maximum likelihood (ML) decoding.
36. Node B according to claim 35 also comprises:
Decoder when empty is decoded when being used to carry out sky.
37. Node B according to claim 34 also comprises:
The channel state feedback unit is used for to described WTRU transmitting channel state information.
38. according to the described Node B of claim 37, wherein Limited Feedback is used to the channel condition information feedback.
39. according to the described Node B of claim 38, wherein channel vector quantification (VQ) is used to the channel condition information feedback.
40. according to the described Node B of claim 37, wherein the statistics feedback is used to the channel condition information feedback.
41. according to the described Node B of claim 40, wherein one of average feedback and covariance feedback are used to the channel condition information feedback.
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| US77246206P | 2006-02-10 | 2006-02-10 | |
| US60/772,462 | 2006-02-10 | ||
| US60/783,640 | 2006-03-17 | ||
| US60/886,794 | 2007-01-26 |
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