+

WO2008133439A1 - Diversité de transmission dans un système de communications hertzien - Google Patents

Diversité de transmission dans un système de communications hertzien Download PDF

Info

Publication number
WO2008133439A1
WO2008133439A1 PCT/KR2008/002335 KR2008002335W WO2008133439A1 WO 2008133439 A1 WO2008133439 A1 WO 2008133439A1 KR 2008002335 W KR2008002335 W KR 2008002335W WO 2008133439 A1 WO2008133439 A1 WO 2008133439A1
Authority
WO
WIPO (PCT)
Prior art keywords
matrix
matrices
symbols
row
permuted
Prior art date
Application number
PCT/KR2008/002335
Other languages
English (en)
Inventor
Farooq Khan
Jiann-An Tsai
Jianzhong Zhang
Original Assignee
Samsung Electronics Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US12/005,341 external-priority patent/US8254492B2/en
Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Priority to JP2009550811A priority Critical patent/JP2010519844A/ja
Priority to CA2684078A priority patent/CA2684078C/fr
Priority to AU2008244895A priority patent/AU2008244895B2/en
Publication of WO2008133439A1 publication Critical patent/WO2008133439A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0669—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different channel coding between antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/068—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission using space frequency diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0606—Space-frequency coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1893—Physical mapping arrangements

Definitions

  • the present invention relates to a method for transmitting data in a communication system, and more specifically, a process and circuits for transmitting information using multiple antennas transmission diversity scheme.
  • a typical cellular radio system includes a number of fixed base stations and a number of mobile stations. Each base station covers an geographical area, which is defined as a cell.
  • a non-line-of-sight (NLOS) radio propagation path exists between a base station and a mobile station due to natural and man-made objects disposed between the base station and the mobile station.
  • NLOS non-line-of-sight
  • radio waves propagate while experiencing reflections, diffractions and scattering.
  • the radio wave which arrives at the antenna of the mobile station in a downlink direction, or at the antenna of the base station in an uplink direction, experiences constructive and destructive additions because of different phases of individual waves generated due to the reflections, diffractions, scattering and out-of-phase reccombination. This is due to the fact that, at high carrier frequencies typically used in a contemporary cellular wireless communication, small changes in differential propagation delays introduces large changes in the phases of the individual waves.
  • the spatial variations in the amplitude and phase of the composite received signal will manifest themselves as the time variations known as Rayleigh fading or fast fading attributable to multipath reception.
  • the time- varying nature of the wireless channel require very high signal-to-noise ratio (SNR) in order to provide desired bit error or packet error reliability.
  • the scheme of diversity is widely used to combat the effect of fast fading by providing a receiver with multiple faded replicas of the same information- bearing signal.
  • Space diversity can be achieved by using multiple transmit or receive antennas. The spatial separation between the multiple antennas is chosen so that the diversity branches, i.e., the signals transmitted from the multiple antennas, experience fading with little or no correlation.
  • Transmit diversity which is one type of space diversity, uses multiple transmission antennas to provide the receiver with multiple uncorrelated replicas of the same signal.
  • Transmission diversity schemes can further be divided into open loop transmit diversity and closed-loop transmission diversity schemes. In the open loop transmit diversity approach no feedback is required from the receiver.
  • a receiver knows an arrangement of transmission antennas, computes a phase and amplitude adjustment that should be applied at the transmitter antennas in order to maximize a power of the signal received at the receiver.
  • selection transmit diversity STD
  • the receiver provides feedback information to the transmitter regarding which antenna(s) to be used for transmission.
  • Alamouti 2 ⁇ 1 space-time diversity scheme An example of open-loop transmission diversity scheme is the Alamouti 2 ⁇ 1 space-time diversity scheme.
  • the Alamouti 2 ⁇ l space-time diversity scheme contemplates transmitting a Alamouti 2 x 2 block code using two transmission antennas using either two time slots (i.e., Space Time Block Code (STBC) transmit diversity) or two frequency subcarriers (i.e., Space Frequency Block Code (SFBC) transmit diversity).
  • STBC Space Time Block Code
  • SFBC Space Frequency Block Code
  • Alamouti 2 ⁇ l space-time diversity scheme is that this scheme can only be applied to two transmission antennas.
  • a Frequency Switched Transmit Diversity (FSTD) or a Time Switched Transmit Diversity (TSTD) is combined with block codes.
  • FSTD Frequency Switched Transmit Diversity
  • TSTD Time Switched Transmit Diversity
  • the matrix of the transmitted symbols from the four transmission antennas may be given as:
  • T y represents symbol transmitted on the Uh antenna and the jth subcarrier or jth time slot
  • the problem with combined SFBC+FSTD scheme and STBC+TSTD schemes is that only a fraction of the total transmission antennas and hence power amplifier capability is used for transmission in a given frequency or time resource. This is indicated by '0' elements in the SFBC+FSTD and STBC+TSTD matrix given above. When the transmit power on the non-zero elements in the matrix is increased, bursty interference is generated to the neighboring cells degrading system performance. Generally, bursty interference manifests itself when certain phases of a frequency hopping pattern incur more interference than other phases.
  • a method for data transmission contemplates modulating data to be transmitted into a plurality of modulated symbols, dividing the plurality of modulated symbols into a plurality of subsets of modulated symbols, with each subset having N modulated symbols, and N being an integer no smaller than 2, encoding each subset of modulated symbols in accordance with a transmission diversity scheme to produce a plurality of N by N matrices, with each N by N matrix corresponding to each pair of modulated symbols, generating a first M by M code matrix comprised of the plurality of N by N matrices, orthogonally spreading the first M by M code matrix to generate a first output matrix, and transmitting the symbols in the first output matrix via a plurality of antennas in a first time slot.
  • the method may further include exchanging a selected pair of rows in the first M by M code matrix to generate a second M by M code matrix, orthogonally spreading the second M by M code matrix to generate a second output matrix, and transmitting the symbols in the second output matrix via the plurality of antennas in a second time slot.
  • the first M by M code matrix may be established by:
  • n 0, 1, ... (N-I)
  • G NxN
  • m is the row number of the matrix
  • n is the column number of the matrix
  • g is selected to be any number between 0 and G-I.
  • the orthogonal spreading of the plurality of N by N matrices being performed according to a Hadamard matrix, and a Hadamard matrix of order n being established by:
  • H n Hj Kl n where I n is an n x n identity matrix.
  • the first output matrix may be generated by generating an M by M spreading matrix which is a Kronecker product of an N by N orthogonally spreading matrix and an X by X matrix with all elements being 1, and orthogonally spreading the first M by M code matrix by an element-wise multiplication of the M by M code matrix and the M by M spreading matrix.
  • the symbols in the second output matrix may be transmitted in response to a negative acknowledgement signal received from a receiver.
  • the method may further include generating a set of row-permuted matrixes based upon the first output matrix, each row-permuted matrix being generated by exchanging a selected pair of rows in the output matrix, segregating the available transmission resource into a plurality of frequency sub-carriers, dividing the plurality of sub-carriers into a plurality of subsets of continuous sub- carriers, each subset of sub-carriers comprising M sub-carriers, selecting a subset of K row-permuted matrices to be mapped into the transmission resources, repeatedly mapping the selected set of K row-permuted matrices into the plurality of sets of sub-carriers, with each set of M sub-carriers corresponding to a row- permuted matrix, and transmitting the symbols in the selected row-permuted matrices using the corresponding sub-carriers via a plurality of antennas.
  • the method may further include generating a set of row-permuted matrixes based upon the first output matrix, each row-permuted matrix being generated by exchanging a selected pair of rows in the output matrix, selecting a subset of K row-permuted matrices, and transmitting the symbols in the selected subset of row-permuted matrices in different time slots, with the symbols in each row-permuted matrix being transmitted in one time slot.
  • the method may further include generating a set of row-permuted matrixes based upon the first output matrix, each row-permuted matrix being generated by exchanging a selected pair of rows in the output matrix, selecting a subset of K row-permuted matrices, segregating available transmission resources into a plurality of frequency sub-carriers, dividing the plurality of sub-carriers into a plurality of sets of continuous sub-carriers, each set of sub-carriers comprising M sub-carriers, selecting a subset of K row-permuted matrices to be mapped into the transmission resources, repeatedly mapping the selected set of K row-permuted matrices into the plurality of sets of sub-carriers, with each set of M sub-carriers corresponding to a row-permuted matrix, and transmitting the symbols in the selected row-permuted matrices using the corresponding sub- carriers via a plurality of antennas in different time slots.
  • a transmitter is constructed with a modulator modulating data to be transmitted into a plurality of modulated symbols, a precoding unit dividing the plurality of modulated symbols into a plurality of subsets, and encoding each subset of modulated symbols from among said plurality of symbols in accordance with a transmission diversity scheme to result in a plurality of N by N matrices, with each N by N matrix corresponding to each pair of modulated symbols, a spreading unit orthogonally spreading the plurality of N by N matrices to generate an output matrix, a permutation unit for permuting at least one pair of rows in the output matrix to generate a plurality of row-permuted matrices, a mapping unit for mapping the symbols in the plurality of row-permuted matrices into available transmission resources, and a plurality of antennas for transmitting the symbols in the plurality of row-permuted matrices.
  • FIG. 1 is an illustration of an Orthogonal Frequency Division Multiplexing (OFDM) transceiver chain suitable for the practice of the principles of the present inventions;
  • OFDM Orthogonal Frequency Division Multiplexing
  • FIG. 2 is an illustration of a Space Time Block Code transmission diversity scheme for two transmission antennas
  • FIG. 3 is an illustration of a Space Frequency Block Code transmission diversity scheme for two transmission antennas
  • FIG. 4 is an illustration of an alternative Space Frequency Block Code transmission diversity scheme for two transmission antennas
  • FIG. 5 is an illustration of a transmitter in Hybrid Repeat reQuest scheme
  • FIG. 6 is an illustration of Hybrid Repeat reQuest scheme
  • FIG. 7 is an illustration of mapping of downlink reference signals in a contemporary 3 rd Generation Partnership Project Long Term Evolution system
  • FIG. 8 is an illustration of a transmission diversity scheme for four transmission antennas according to a first embodiment of the principles of the present invention
  • FIG. 9 is an illustration of a transmission diversity scheme for four transmission antennas according to a second embodiment of the principles of the present invention
  • FIG. 10 is an illustration of a transmission diversity scheme for four transmission antennas according to a third embodiment of the principles of the present invention.
  • FIG. 11 is an illustration of a transmission diversity scheme for four transmission antennas according to a fourth embodiment of the principles of the present invention.
  • FIG. 12 is an illustration of a transmission diversity scheme for four transmission antennas according to a fifth embodiment of the principles of the present invention.
  • FIG. 13 is an illustration of a transmission diversity scheme for four transmission antennas according to a sixth embodiment of the principles of the present invention.
  • FIG. 14 is an illustration of a transmitter constructed as an exemplary embodiment according to the principles of the present invention.
  • FIG. 1 illustrates an Orthogonal Frequency Division Multiplexing (OFDM) transceiver chain.
  • OFDM Orthogonal Frequency Division Multiplexing
  • control signals or data 111 is modulated by modulator 112 and is serial-to-parallel converted by Serial/Parallel (S/P) converter 113.
  • IFFT Inverse Fast Fourier Transform
  • CP Cyclic prefix
  • ZP zero prefix
  • the signal is transmitted by transmitter (Tx) front end processing unit 117, such as an antenna (not shown), or alternatively, by fixed wire or cable.
  • receiver chain 120 assuming perfect time and frequency synchronization are achieved, the signal received by receiver (Rx) front end processing unit 121 is processed by CP removal unit 122.
  • FFT Fast Fourier Transform
  • the total bandwidth in an OFDM system is divided into narrowband frequency units called subcarriers.
  • the number of subcarriers is equal to the FFT/IFFT size N used in the system.
  • the number of subcarriers used for data is less than N because some subcarriers at the edge of the frequency spectrum are reserved as guard subcarriers. In general, no information is transmitted on guard subcarriers.
  • the scheme of diversity is widely used to combat the effect of fast fading by providing a receiver with multiple faded replicas of the same information- bearing signal.
  • An example of open-loop transmission diversity scheme is the Alamouti 2x1 space-time block code (STBC) transmission diversity scheme as illustrated in FIG. 2.
  • STBC space-time block code
  • a transmitter transmits two data symbols via two transmission antennas to a receiver.
  • symbols Si and S 2 are respectively transmitted via antennas ANT 1 and ANT 2.
  • symbols — S* 2 and S*i are respectively transmitted via antennas ANT 1 and ANT 2, where x* represents complex conjugate of x.
  • the receiver After receiving the signals, the receiver performs a plurality of processes to recover original symbols Si and S 2 .
  • the instantaneous channel gains gl and g2 for ANT 1 and ANT 2, respectively, are required for processing at the receiver. Therefore, the transmitter needs to transmit separate pilot symbols via both the antennas ANT 1 and ANT 2 for channel gain estimation at the receiver.
  • the diversity gain achieved by Alamouti coding is the same as that achieved in Maximum Ratio Combining (MRC).
  • the 2x1 Alamouti scheme can also be implemented in a space-frequency block code (SFBC) transmission diversity scheme as illustrated in FIG. 3.
  • SFBC space-frequency block code
  • symbols Si and S 2 are respectively transmitted to a receiver via antennas ANT 1 and ANT 2 on a first subcarrier having frequency fl in an Orthogonal Frequency Division Multiplexing (OFDM) system
  • symbols -S* 2 and S*i are respectively transmitted via antennas ANT 1 and ANT 2 on a second subcarrier having frequency f2. Therefore a matrix of transmitted symbols from antennas ANT 1 and ANT 2 can be written as:
  • the received signal at the receiver on subcarrier having frequency fl is r x
  • the received signal at the receiver on subcarrier having frequency f2 is r 2 .
  • i"i and r 2 can be written as: where hi and h 2 are channel gains from ANT 1 and ANT 2 respectively. We also assume that the channel from a given antennas does not change between subcarrier having frequency fi and subcarrier having frequency f 2 .
  • the receiver performs equalization on the received signals and combines the two received signals (V 1 and r 2 ) to recover the symbols Si and S 2 .
  • the recovered symbols Si and S 2 can be written as:
  • both of the transmitted symbols Si and S 2 achieve full spatial diversity, that is, the each of the transmitted symbols S x and S 2 completely removes an interference from the other one.
  • FIG. 4 An alternative mapping for two transmission antennas SFBC scheme is shown in FIG. 4.
  • a matrix of transmitted symbols from antennas ANT 1 and ANT 2 can be written as:
  • the transmit matrix in Equation (5) for the scheme in FIG. 4 is a transpose of the transmit matrix in Equation (2) for the scheme shown in FIG. 3.
  • orthogonal full-diversity block codes are not available.
  • a and B are block codes given as below.
  • Hybrid Automatic Repeat request is a retransmission scheme whereby a transmitter sends redundant coded information (i.e., subpackets) in small increments.
  • an information packet P is first input into channel coder 131 to perform channel coding.
  • the resulted coded bit stream is input into subpacket generator 132 to break into smaller units, i.e., subpackets SPl, SP2, SP3 and SP4.
  • the hybrid ARQ retransmissions can either contain redundant symbols or coded bits which are different than the previous transmission(s) or copies of the same symbols or coded bits.
  • the scheme which retransmits copies of the same information is referred to as chase combining. In case of Chase combining, the subpackets SPl, SP2, SP3 and SP4 as shown in Figure 4 are all identical.
  • the scheme where retransmitted symbols or coded bits are different than the previous transmission is generally referred to as an incremental redundancy scheme.
  • Hybrid ARQ protocol An example of Hybrid ARQ protocol is shown in FIG. 6.
  • receiver 140 After receiving the first subpacket SPl from transmitter 130, receiver 140 tries to decode the received information packet. In case of unsuccessful decoding, receiver 140 stores SPl and sends a Negative Acknowledgement (NACK) signal to transmitter 130. After receiving the NACK signal, transmitter 130 transmits the second subpacket SP2. After receiving the second subpacket SP2, receiver 140 combines SP2 with the previously received subpacket SPl, and tries to jointly decode the combined information packet. At any point, if the information packet is successfully decoded by indication of a successful Cyclic Redundancy Check (CRC) check, for example, receiver 140 sends an ACK signal to transmitter 130.
  • CRC Cyclic Redundancy Check
  • the information packet is successfully decoded after receiving and combining three subpackets, SPl, SP2 and SP3.
  • the ARQ protocol shown in FIG. 6 is generally referred to as stop-and-wait protocol because the transmitter waits for the ACK/NACK signal before sending the next subpacket. After receiving the ACK signal, the transmitter can move on to transmit a new information packet to the same or a different user.
  • the downlink reference signals mapping for four transmission antennas in the 3GPP LTE (3 rd Generation Partnership Project Long Term Evolution) system is shown in FIG. 7.
  • the notation R p is used to denote a resource element used for reference signal transmission on antenna port p . It can be noted that density on antenna ports 2 and 3 is half the density on antenna ports 0 and 1. This leads to weaker channel estimates on antenna ports 2 and 3 relative to channel estimates on antenna ports 0 and 1.
  • a 2x2 Fourier matrix can be expressed as:
  • Multiple Fourier matrices can be defined by introducing a shift parameter (g/G) in the Fourier matrix.
  • the entry of the multiple Fourier matrices is given by:
  • Hadamard matrix of order n is a solution to Hadamard's matrimum determinant problem.
  • An equivalent definition of the Hadamard matrices is given by:
  • HM J nL (20) where In is an n x n identity matrix.
  • a Hadamard matrix of order 4 can be expresses as: n i i i
  • each matrix A and B is an Alamouti code for the pair of symbols Si and S 2 , and the pair of symbols S 3 and S 4 , respectively.
  • the Fourier matrix P 2 2 can be used to generate the following 4x4 transmission matrix.
  • FIG. 8 is an illustration of the transmission diversity scheme for four transmission antennas and four time slots according to Equation (25) in the first embodiment of the principles of the present invention.
  • the same principle can be applied to the case where the 4x4 matrix transmission is over a mix of subcarriers and time slots.
  • the four elements (index n) can be constructed with 2 subcarriers and 2 time slots.
  • T 1 r is useful for evening out pilot-density disparity inherent in the reference signal structure of the LTE system.
  • T 0 r is given by the following.
  • FIG. 9 is an illustration of the transmission diversity scheme for four transmission antennas and four time slots according to Equation (27) in the second embodiment of the principles of the present invention.
  • Equation (8) we propose to exchange the second and the third row of the SFBC-FSTD matrix as shown in Equation (8), thus resulting in new SFBC matrix.
  • symbols Si and S 2 are transmitted over antennas ports 0 and 2 while symbols S 3 and S 4 are transmitted over antenna ports 1 and 3 as given by the transmit matrix below. Again, this is useful for evening out pilot-density disparity inherent in the reference signal structure of the LTE system.
  • FIG. 10 is an illustration of the transmission diversity scheme for four transmission antennas and four time slots according to Equation (28) as in the third embodiment of the principles of the present invention.
  • the matrices A and B are permuted for Hybrid ARQ retransmissions or repeated symbols as below:
  • T 2 is used for the first transmission at the first time slot (slot 1) and T 2 h is used for the second transmission at the fifth time slot (slot 5).
  • symbols (Si, S 2 ) are transmitted via antenna 1 and 2 for the first transmission and antennas 3 and 4 when repeated for the second transmission.
  • symbols (S 3 , S 4 ) are transmitted via antenna 3 and 4 for the first transmission and antennas 1 and 2 when repeated for the second transmission.
  • the transmitter maps the modulated symbols to the physical time- frequency OFDM transmission resource
  • the transmitter selects a subset of K permuted matrices from the six permuted matrices for a given number i.
  • the transmitter divides the OFDM transmission resource into K parts in frequency domain, each uses a selected permuted matrix from the subset of K matrices.
  • the transmitter transmits the same four modulated symbols by using TQ via four subcarriers in time slot 3. Noteworthy, this approach of applying permuted SFBC matrices on retransmissions apply to both Chase Combining and incremental redundancy.
  • a seventh embodiment according to the principles of the current invention, the application of permuted matrices in frequency dimension, and the application of the permuted matrices in time dimension over several HARQ retransmissions, are combined.
  • row-permuted matrices T 0 ⁇ , T 0 B and T 0 0 in frequency dimension may be used for different sub-carriers during each retransmission.
  • row-permuted matrices T 0 A , T 0 B and T o c in frequency dimension are used for different sub-carriers; in a second time slot, row-permuted matrices To D , To E and To F are used for the corresponding sub-carriers.
  • FIG. 14 is an illustration of a transmitter constructed as an exemplary embodiment according to the principles of the present invention.
  • Transmitter 200 is constructed with a modulator 210, a preceding unit 220, a spreading unit 230, a permutation unit 240, a mapping unit 250 and a plurality of antennas 240.
  • Modulator 210 modulates data to be transmitted into a plurality of modulated symbols.
  • Precoding unit 220 encodes each subset of modulated symbols from among said plurality of symbols in accordance with a transmission diversity scheme to result in a plurality of N by N matrices.
  • each N by N matrix corresponds to each subset of N modulated symbols.
  • Spreading unit 230 orthogonally spreads the plurality of N by N matrices to generate an output matrix.
  • Permutation unit 240 generates several row-permuted matrices based upon the output matrix.
  • Mapping unit 250 maps the symbols in the row-permuted matrices into a plurality of resource elements.
  • the symbols in the row-permuted matrices is transmitted through the plurality of antennas 260 by using either a space time transmission diversity scheme, a space frequency transmission diversity scheme, or a combination of a space time transmission diversity scheme and a space frequency transmission diversity scheme.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)

Abstract

Procédé de transmission de données via plusieurs antennes par modulation des données à transmettre en plusieurs symboles modulés, codage de chaque paire de symboles modulés dans cette pluralité de symboles selon une diversité de transmission pour donner des matrices N par N, chaque matrice correspondant à chaque paire de symboles modulés, production de matrice de code M par M constituée des matrices N par N, étalement orthogonal de la matrice de code pour donner une matrice de sortie, production de plusieurs matrices à permutation de rangée par échange d'au moins une paire de rangées dans la matrice de sortie, et transmission des symboles dans la pluralité de matrices à permutation de rangée via plusieurs antennes, soit en diversité de transmission spatio-temporelle, soit en diversité de transmission spatio-fréquencielle, soit en combinaison de ces deux modes de transmission en diversité
PCT/KR2008/002335 2007-04-26 2008-04-24 Diversité de transmission dans un système de communications hertzien WO2008133439A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2009550811A JP2010519844A (ja) 2007-04-26 2008-04-24 無線通信システムの送信ダイバシティ
CA2684078A CA2684078C (fr) 2007-04-26 2008-04-24 Diversite de transmission dans un systeme de communications hertzien
AU2008244895A AU2008244895B2 (en) 2007-04-26 2008-04-24 Transmit diversity in a wireless communication system

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US92402107P 2007-04-26 2007-04-26
US60/924,021 2007-04-26
US92433807P 2007-05-09 2007-05-09
US60/924,338 2007-05-09
US12/005,341 2007-12-27
US12/005,341 US8254492B2 (en) 2007-04-26 2007-12-27 Transmit diversity in a wireless communication system

Publications (1)

Publication Number Publication Date
WO2008133439A1 true WO2008133439A1 (fr) 2008-11-06

Family

ID=39886959

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2008/002335 WO2008133439A1 (fr) 2007-04-26 2008-04-24 Diversité de transmission dans un système de communications hertzien

Country Status (1)

Country Link
WO (1) WO2008133439A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010530170A (ja) * 2007-06-13 2010-09-02 エルジー エレクトロニクス インコーポレイティド 移動通信システムで拡散信号の送信
JP2010531091A (ja) * 2007-06-13 2010-09-16 エルジー エレクトロニクス インコーポレイティド 通信システムにおける拡散信号の送信
CN101877688A (zh) * 2009-04-29 2010-11-03 华为技术有限公司 Ofdm系统的分集发射方法与装置
US8363743B2 (en) 2007-06-21 2013-01-29 Lg Electronics Inc. Method for receiving control information in orthogonal frequency division multiplexing system of mobile communication system
US8509175B2 (en) 2006-10-02 2013-08-13 Lg Electronics Inc. Method for transmitting downlink control signal
USRE44564E1 (en) 2006-10-02 2013-10-29 Lg Electronics Inc. Method for transmitting control signal using efficient multiplexing
US8630242B2 (en) 2007-03-19 2014-01-14 Lg Electronics Inc. Resource allocation method and a method for transmitting/receiving resource allocation information in mobile communication system
EP2712103A1 (fr) * 2012-09-21 2014-03-26 Alcatel Lucent Appareils, procédés et programmes informatiques pour émetteur et décodeur MIMO
US9078247B2 (en) 2007-03-19 2015-07-07 Lg Electronics Inc. Method for receiving ACK/NACK signal in mobile communication system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050190853A1 (en) * 2000-02-22 2005-09-01 Olav Tirkkonen Method and arrangement for digital signal transmission using layered space-time codes
US7002900B2 (en) * 2002-10-25 2006-02-21 Qualcomm Incorporated Transmit diversity processing for a multi-antenna communication system
KR20060040245A (ko) * 2004-11-04 2006-05-10 삼성전자주식회사 시공간 주파수 블록 부호화 장치 및 방법

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050190853A1 (en) * 2000-02-22 2005-09-01 Olav Tirkkonen Method and arrangement for digital signal transmission using layered space-time codes
US7002900B2 (en) * 2002-10-25 2006-02-21 Qualcomm Incorporated Transmit diversity processing for a multi-antenna communication system
KR20060040245A (ko) * 2004-11-04 2006-05-10 삼성전자주식회사 시공간 주파수 블록 부호화 장치 및 방법

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8509175B2 (en) 2006-10-02 2013-08-13 Lg Electronics Inc. Method for transmitting downlink control signal
US9967064B2 (en) 2006-10-02 2018-05-08 Lg Electronics Inc. Method for transmitting control signal using efficient multiplexing
US9729282B2 (en) 2006-10-02 2017-08-08 Lg Electronics Inc. Method for transmitting control signal using efficient multiplexing
US9451613B2 (en) 2006-10-02 2016-09-20 Lg Electronics Inc. Method for transmitting control signal using efficient multiplexing
US9106379B2 (en) 2006-10-02 2015-08-11 Lg Electronics Inc. Method for transmitting control signal using efficient multiplexing
USRE44564E1 (en) 2006-10-02 2013-10-29 Lg Electronics Inc. Method for transmitting control signal using efficient multiplexing
US9331816B2 (en) 2007-03-19 2016-05-03 Lg Electronics Inc. Method for receiving ACK/NACK signal in mobile communications system
US8787297B2 (en) 2007-03-19 2014-07-22 Lg Electronics Inc. Resource allocation method and a method for transmitting/receiving resource allocation information in mobile communication system
US9191173B2 (en) 2007-03-19 2015-11-17 Lg Electronics Inc. Resource allocation method and a method for transmitting/receiving resource allocation information in mobile communication system
US9078247B2 (en) 2007-03-19 2015-07-07 Lg Electronics Inc. Method for receiving ACK/NACK signal in mobile communication system
US9826518B2 (en) 2007-03-19 2017-11-21 Lg Electronics Inc. Method for receiving ACK/NACK signal in mobile communication system
US10616874B2 (en) 2007-03-19 2020-04-07 Lg Electronics Inc. Method for receiving ACK/NACK signal in mobile communication system
US8630242B2 (en) 2007-03-19 2014-01-14 Lg Electronics Inc. Resource allocation method and a method for transmitting/receiving resource allocation information in mobile communication system
US8923241B2 (en) 2007-03-19 2014-12-30 Lg Electronics Inc. Resource allocation method and a method for transmitting/receiving resource allocation information in mobile communication system
US9900138B2 (en) 2007-03-19 2018-02-20 Lg Electronics Inc. Resource allocation method and a method for transmitting/receiving resource allocation information in mobile communication system
US9749109B2 (en) 2007-03-19 2017-08-29 Lg Electronics Inc. Resource allocation method and a method for transmitting/receiving resource allocation information in mobile communication system
US9048992B2 (en) 2007-06-13 2015-06-02 Lg Electronics Inc. Transmitting spread signal in communication system
US8774297B2 (en) * 2007-06-13 2014-07-08 Lg Electronics Inc. Transmitting spread signal in communication system
US8792570B2 (en) * 2007-06-13 2014-07-29 Lg Electronics Inc. Transmitting spread signal in communication system
US20130148697A1 (en) * 2007-06-13 2013-06-13 Lg Electronics Inc. Transmitting spread signal in communication system
JP2010531091A (ja) * 2007-06-13 2010-09-16 エルジー エレクトロニクス インコーポレイティド 通信システムにおける拡散信号の送信
US8582626B2 (en) 2007-06-13 2013-11-12 Lg Electronics Inc. Transmitting spread signal in communication system
US8774299B2 (en) * 2007-06-13 2014-07-08 Lg Electronics Inc. Transmitting spread signal in communication system
US10742256B2 (en) 2007-06-13 2020-08-11 Lg Electronics Inc. Transmitting spread signal in communication system
US20110243198A1 (en) * 2007-06-13 2011-10-06 Jung Hoon Lee Transmitting spread signal in communication system
US8369378B2 (en) 2007-06-13 2013-02-05 Lg Electronics Inc. Transmitting spread signal in communication system
US9197392B2 (en) 2007-06-13 2015-11-24 Lg Electronics Inc. Transmitting spread signal in communication system
JP2010530170A (ja) * 2007-06-13 2010-09-02 エルジー エレクトロニクス インコーポレイティド 移動通信システムで拡散信号の送信
US20110158292A1 (en) * 2007-06-13 2011-06-30 Jung Hoon Lee Transmitting spread signal in communication system
USRE44928E1 (en) 2007-06-21 2014-06-03 Lg Electronics Inc. Method for receiving control information in orthogonal frequency division multiplexing system of mobile communication system
USRE45523E1 (en) 2007-06-21 2015-05-19 Lg Electronics Inc. Method for receiving control information in orthogonal frequency division multiplexing system of mobile communication system
USRE46693E1 (en) 2007-06-21 2018-01-30 Lg Electronics Inc. Method for receiving control information in orthogonal frequency division multiplexing system of mobile communication system
USRE46694E1 (en) 2007-06-21 2018-01-30 Lg Electronics Inc. Method for receiving control information in orthogonal frequency division multiplexing system of mobile communication system
USRE45103E1 (en) 2007-06-21 2014-09-02 Lg Electronics Inc. Method for receiving control information in orthogonal frequency division multiplexing system of mobile communication system
US8363743B2 (en) 2007-06-21 2013-01-29 Lg Electronics Inc. Method for receiving control information in orthogonal frequency division multiplexing system of mobile communication system
CN101877688A (zh) * 2009-04-29 2010-11-03 华为技术有限公司 Ofdm系统的分集发射方法与装置
CN101877688B (zh) * 2009-04-29 2014-01-01 华为技术有限公司 Ofdm系统的分集发射方法与装置
EP2712103A1 (fr) * 2012-09-21 2014-03-26 Alcatel Lucent Appareils, procédés et programmes informatiques pour émetteur et décodeur MIMO

Similar Documents

Publication Publication Date Title
EP2717505B1 (fr) Diversité de transmission dans un système de communication sans fil
JP5731612B2 (ja) Ｍｉｍｏ無線通信システムにおけるアンテナマッピングのための装置及び方法
US8265190B2 (en) Multiple antennas transmit diversity scheme
US7991063B2 (en) Transmission symbols mapping for antenna diversity
WO2009002093A2 (fr) Procédés de transmission à diversité de retard et diversité de fréquence spatiale
WO2008133439A1 (fr) Diversité de transmission dans un système de communications hertzien
CN101622797A (zh) 无线通信系统中的传输分集
CHAIN et al. Khan et al. 45 Date of Patent:* Au. 28 2012

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 200880006125.8

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08741553

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2008244895

Country of ref document: AU

WWE Wipo information: entry into national phase

Ref document number: 2235/KOLNP/2009

Country of ref document: IN

ENP Entry into the national phase

Ref document number: 2008244895

Country of ref document: AU

Date of ref document: 20080424

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 2009550811

Country of ref document: JP

WWE Wipo information: entry into national phase

Ref document number: 2684078

Country of ref document: CA

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 08741553

Country of ref document: EP

Kind code of ref document: A1

点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载