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公开(公告)号：JP2000261246A
公开(公告)日：2000-09-22
申请号：JP2000055087
申请日：2000-03-01
Applicant: LUCENT TECHNOLOGIES INC
Inventor： HOCHWALD BERTRAND M , MARZETTA THOMAS LOUIS
Abstract: PROBLEM TO BE SOLVED: To obtain an antenna array used for communication of both up-link and down-link in a radio communication system like a cellular. SOLUTION: In a cellular base station including a receiver 95, a transmitter 100 m and a log period antenna array 105, an up-link (for reception) sub-array consists of antenna elements A2 to AM. The output of each of these elements is the input to the receiver 95. In this case, outputs are multiplied by weight coefficients W2 to WM on the outside of the receiver 95. A down-link (for transmission) sub-array consists of antenna elements A1 to AM-1. The transmitter 100 sends a modulated carrier signal to each element. Inputs of antenna elements A1 to AM-1 are multiplied by weight coefficients W'1 to W'M-1 on the outside of the transmitter 100. Thus, the log period antenna array 105 consisting of antenna elements A1 to AM is shared between transmission and reception.
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公开(公告)号：JP2000209137A
公开(公告)日：2000-07-28
申请号：JP36813499
申请日：1999-12-24
Applicant: LUCENT TECHNOLOGIES INC
Abstract: PROBLEM TO BE SOLVED: To achieve diversity merits without receiving demerits so much by transmitting respective data symbol sets to the respective users of a user group by the form plural mutually different signal sequences which are the linear connection of spreading code sequences belonging to a corresponding code group. SOLUTION: An antenna 1 (25.1) transmits signals (1/21/2) (b1c1+b2c2) and the antenna 2 (25.2) transmits the signals (1/21/2) (b2c1-b1c2). In such a manner, while only two pieces of spreading codes are used, the two codes are used for a data symbol to the user (20.1) and also the two codes are used for the data symbol to the user (20.2) as well. Thus, at the time of using plural transmitter antennas, a system for sufficiently achieving the diversity merits without receiving the demerits in the number of the codes required to be allocated per user so much, is realized.
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公开(公告)号：JP2000232385A
公开(公告)日：2000-08-22
申请号：JP34688499
申请日：1999-12-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： HOCHWALD BERTRAND M , MARZETTA THOMAS LOUIS , RICHARDSON THOMAS J , SWELDENS WIM , URBANKE RUDIGER L
Abstract: PROBLEM TO BE SOLVED: To perform design so as to minimize correlation between a pair error probability increasing type signal matrices by setting matrices so that product matrices have relatively low correlation with each other and using an appropriate subset of these product matrices as a signal constellation. SOLUTION: Random selection for a (u) vector is generated (30). Further, L constellations of signal matrices are generated from a generator matrix represented by each (u) vector (40). Further, a complete set of (L-1) correlation matrices is formed for the respective constellations (50). Error probability standards are calculated for each of the respective correlation matrices (55). The largest one is identified among all of the error probability standards (60). An optimum constellation is selected after calculating the maximum error probability standard for each constellation (65). The selected constellation is one whose maximum error probability standard is the smallest.
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公开(公告)号：JP2001298387A
公开(公告)日：2001-10-26
申请号：JP2001065899
申请日：2001-03-09
Applicant: LUCENT TECHNOLOGIES INC
Inventor： HASSIBI BABAK , HOCHWALD BERTRAND M , SHOKROLLAHI MOHAMMAD AMIN , SWELDENS WIM
Abstract: PROBLEM TO BE SOLVED: To provide an approach on the basis of a principle to a spatiotemporal signal constellation design that can further sufficiently accomplish a logical advantage of a high data rate and a low error probability. SOLUTION: This method is provided for a radio signal transmission of a signal from two or more antenna arrays where each signal to be transmitted is selected from a constellation of unitary spatiotemporal signals. Each signal is a unitary matrix in which each column shows its own antenna, each row shows its own time interval, and each element shows complex amplitude transmitted by a prescribed antenna in a prescribed time interval. In a specified performance form, a signal constellation matrix forms a non abelian group having a positive diversity product or the remainder or the like of such a group. In another performance from, a signal constellation is a subset of such a group, and its multiplication closure forms a finite non abelian group having a positive diversity product.
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公开(公告)号：JP2001094489A
公开(公告)日：2001-04-06
申请号：JP2000214304
申请日：2000-07-14
Applicant: LUCENT TECHNOLOGIES INC
Inventor： HOCHWALD BERTRAND M , SWELDENS WIM
Abstract: PROBLEM TO BE SOLVED: To generalize a differential phase modulation system for the purpose of employing the system for an optional number of antennas. SOLUTION: A plurality of base band signals is generated, each base band signal has one or more temporal complex sequence, and respective antennas 15 of a multiplex transmitter antenna array transmit each sequence. Each base band signal can be expressed as a transmission matrix. In this matrix, each column denotes each antenna 15 and each row depicts each time segment. Each transmission matrix is generated based on input data and a preceding transmission matrix denoting a base band signal sent previously. The base band signal modulates a carrier to generate a transmission carrier level signal. The transmission carrier level signal is sent by the multiplex transmitter antenna array. At least one antenna 20 on the receiver side receives a reception carrier level signal.
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Patent Agency Ranking
公开(公告)号：JP2000091969A
公开(公告)日：2000-03-31
申请号：JP22897999
申请日：1999-08-13
Applicant: LUCENT TECHNOLOGIES INC
Inventor： HOCHWALD BERTRAND M , MARZETTA THOMAS LOUIS
Abstract: PROBLEM TO BE SOLVED: To decrease error rate and to increase data rate by actualizing such a communication method that the amplitude of a base band signal represents antennas that respective columns constitute, respective rows are represented as a matrix showing individual time intervals, and the matrix is proportional to a matrix whose columns are orthogonal. SOLUTION: Respective transmit signals are sets of M vectors in a temporal viewpoint, have length T, and accompany transmitting antennas. Those are all a notation system which is proportional to a matrix ϕl of T×M. All the columns of each matrix ϕl are regularly orthogonal and the base band signal is Sl=(TP (mean electric power sent to each antenna))1/2ϕl. The base band signal is inputted to the transmission array of antennas 15.1 to 15.3 and transmitted to the reception array of antennas 20.1 and 20.1. A singular value is a measure with which different M partial spaces of a T-dimensional space are generated from a linear combination of M columns of an unprime matrix. As the singular value is smaller and smaller, nonsimilariaty becomes larger and larger.
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公开(公告)号：JPH11168453A
公开(公告)日：1999-06-22
申请号：JP27070398
申请日：1998-09-25
Applicant: LUCENT TECHNOLOGIES INC
Inventor： HOCHWALD BERTRAND M , MARZETTA THOMAS LOUIS
Abstract: PROBLEM TO BE SOLVED: To enhance cost-effectiveness and to simply realize high bit rate by transmitting a virtual transmitting signal through the partial aggregation of a virtual sub-channel by using propagation information. SOLUTION: A first unit 12 transmits a diagonal matrix D to a channel encoder/modulator 24 in transmission from the first unit 12 to the second unit 14 so as to encode and modulate an information stream from a data source 28. The channel encoder/modulator 211 encodes and modulate the information stream, forms plural sub-information streams which differ in accordance with the non-zero value of the diagonal matrix D and generates a virtual transmitting signal. The virtual transmitting signal is expressed as a vector and its respective configuration components are transmitted by the respective virtual sub-channels. Moreover, a unitary conversion block 30 executes the unitary conversion of the virtual transmitting signal by multiplexing the virtual transmitting signal through the use of the conjugate transposition of a unitary matrix ϕ. Finally, the first unit 12 utilizes the result of unitary conversion 30 so as to generate the base band version of the actual transmitting signal.
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公开(公告)号：DE69931436D1
公开(公告)日：2006-06-29
申请号：DE69931436
申请日：1999-08-02
Applicant: LUCENT TECHNOLOGIES INC
Inventor： HOCHWALD BERTRAND M , MARZETTA THOMAS LOUIS
Abstract: Disclosed is a modulation method for wireless signal transmission. Each message that is transmitted is made up of a sequence of signals, each selected from a constellation of L such signals, L a positive integer. Each transmitted signal is distributed spatially across a transmitting antenna array, and is also distributed in time. Thus, each signal may be represented as a TxM matrix, in which each of the M columns represents a distinct antenna of the array, and each of the T rows represents a distinct time interval. Each entry in this matrix represents a complex baseband voltage amplitude. Each of these signal matrices is proportional to a matrix having orthonormal columns.
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公开(公告)号：CA2287759C
公开(公告)日：2003-07-29
申请号：CA2287759
申请日：1999-10-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SWELDENS WIM , URBANKE RUDIGER L , MARZETTA THOMAS LOUIS , RICHARDSON THOMAS J , HOCHWALD BERTRAND M
Abstract: Messages according to a method of wireless signal transmission are sent as sequences of unitary space-time signals. Each signal is representable as a matrix in which each column represents a respective transmitting antenna of a transmitting array, and each row represents a time segment. Each such matrix is proportional to a complex-valued matrix, all columns of which are mutually orthonormal. A ne w method for creating a constellation of signal matrices comprises providing a n initial signal in the form of a complex, orthonormal matrix. The method further comprises generating a further plurality of matrices by a process that assures that ea ch of the generated matrices is related to the initial matrix as a product of one or more multiplications of the initial matrix by one or more unitary matrices.
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公开(公告)号：CA2275520C
公开(公告)日：2003-07-08
申请号：CA2275520
申请日：1999-06-18
Applicant: LUCENT TECHNOLOGIES INC
Inventor： HOCHWALD BERTRAND M , MARZETTA THOMAS LOUIS
Abstract: Disclosed is a modulation method for wireless signal transmission. Each message that is transmitted is made up of a sequence of signals, each selected from a constellation of L such signals, L a positive integer. Each transmitted signal is distributed spatially across a transmitting antenna array, and is also distributed in time. Thus, each signal may be represented as a TxM matrix, in which each of the M columns represents a distinct antenna of the array, and each of the T rows represents a distinct time interval. Each entry in this matrix represents a complex baseband voltage amplitude. Each of these signal matrices is proportional to a matrix having orthonormal columns.
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