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公开(公告)号：AU1108401A
公开(公告)日：2001-07-19
申请号：AU1108401
申请日：2001-01-05
Applicant: LUCENT TECHNOLOGIES INC
Abstract: In a MIMO system the signals transmitted from the various antennas are processed so as to improve the ability of the receiver to extract them from the received signal even in the face of some correlation. More specifically the number of bit streams that is transmitted simultaneously is adjusted, e.g., reduced, depending on the level of correlation, while multiple versions of each bit stream, variously weighted, are transmitted simultaneously. The variously weighted versions are combined to produced one combined weighted signal. The receiver processes the received signals in the same manner as it would have had all the signals reaching the receive antennas been uncorrelated. The weight vectors may be determined by the forward channel transmitter using the channel properties of the forward link which are made known to the transmitter of the forward link by being transmitted from the receiver of the forward link by the transmitter of the reverse link or the weight vectors may be determined by the forward channel transmitter using the channel properties of the forward link and the determined weight vectors are made known to the transmitter of the forward link by being transmitted from the receiver of the forward link by the transmitter of the reverse link. The channel properties used to determine the weight vectors may include the channel response from the transmitter to the receiver and the covariance matrix of noise and interference measured at the receiver.
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公开(公告)号：BR9905882A
公开(公告)日：2000-08-15
申请号：BR9905882
申请日：1999-10-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： RASHID-FARROKHI FARROKH , VALENZUELA REINALDO A
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公开(公告)号：AU5715999A
公开(公告)日：2000-06-08
申请号：AU5715999
申请日：1999-10-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： RASHID-FARROKHI FARROKH , VALENZUELA REINALDO A
Abstract: The signal to interference and noise ratio (SINR) of wireless systems can be improved, if not optimized, by determining operating parameters used by the base station to substantially simultaneously control the transmit beam patterns that are each formed to establish a communication channel between a base station and a respective one of the wireless terminals as a function of received channel information from at least two of the wireless terminals. In an exemplary embodiment of the invention, the weight vectors and the power allocation employed by a base station are determined by the base station using information supplied by at least each of the wireless terminals served by the base station, and potentially from wireless terminals served by other base stations, e.g., in neighboring cells to the cell served by the base station, the information from the other cells being supplied via the neighboring cell base stations using inter-base-station communication, e.g., a wire line connection.
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Patent Agency Ranking
公开(公告)号：CA2327611C
公开(公告)日：2006-01-24
申请号：CA2327611
申请日：2000-12-05
Applicant: LUCENT TECHNOLOGIES INC
Abstract: In a MIMO system the signals transmitted from the various antennas are processed so as to improve the ability of the receiver to extract them from the received signal even in the face of some correlation. More specifically the number of bit streams that is transmitted simultaneously is adjusted, e.g., reduced, depending on the level of correlation, while multiple versions of each bit stream, variously weighted, are transmitted simultaneously. The variously weighted versions are combined to produced one combined weighted signal. The receiver processes the received signals in the same manner as it would have had all the signals reaching the receive antennas be en uncorrelated. The weight vectors may be determined by the forward channel transmitter using the channel properties of the forward link which are made known to the transmitter of the forward link by being transmitted from the receiver of the forward li nk by the transmitter of the reverse link or the weight vectors may be determined by t he forward channel transmitter using the channel properties of the forward link and the determined weight vectors are made known to the transmitter of the forward link by bein g transmitted from the receiver of the forward link by the transmitter of the reverse link . The channel properties used to determine the weight vectors may include the channel response from the transmitter to the receiver and the covariance matrix of noise and interference measured at the receiver.
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公开(公告)号：BR0103224A
公开(公告)日：2002-04-02
申请号：BR0103224
申请日：2001-08-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LOZANO ANGEL , VALENZUELA REINALDO A , RASHID-FARROKHI FARROKH
Abstract: Signals are developed for use in a wireless system with multiple transmit and multiple receive antennas so that even in the face of some correlation the most open-loop capacity that can be achieved using a substantially open-loop system with a channel of. that level of correlation is obtained. In accordance with the principles of the invention, the signals transmitted from the various antennas are processed so as to improve their ability to convey the maximum amount of information. More specifically, the data to be transmitted is divided into M+1 substreams, where M is the number of transmit antennas. Each transmit antenna is supplied with a combination signal that is made up of a weighted version of a common one of the substreams and a weighted version of a respective one of the substreams that is supplied uniquely for that antenna, so that there are M transmit signals. A receiver having N antennas receives the M transmit signals as combined by the channel and reconstitutes the original data therefrom. This may be achieved using successive decoding techniques. Advantageously, the capacity, i.e., the rate of information that can be conveyed with an arbitrarily small probability of error when the instantaneous forward channel condition is unknown to the transmitter, is maximized.
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公开(公告)号：AU5799301A
公开(公告)日：2002-02-21
申请号：AU5799301
申请日：2001-08-13
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LOZANO ANGEL , VALENZUELA REINALDO A , RASHID-FARROKHI FARROKH
Abstract: Signals are developed for use in a wireless system with multiple transmit and multiple receive antennas so that even in the face of some correlation the most open-loop capacity that can be achieved using a substantially open-loop system with a channel of. that level of correlation is obtained. In accordance with the principles of the invention, the signals transmitted from the various antennas are processed so as to improve their ability to convey the maximum amount of information. More specifically, the data to be transmitted is divided into M+1 substreams, where M is the number of transmit antennas. Each transmit antenna is supplied with a combination signal that is made up of a weighted version of a common one of the substreams and a weighted version of a respective one of the substreams that is supplied uniquely for that antenna, so that there are M transmit signals. A receiver having N antennas receives the M transmit signals as combined by the channel and reconstitutes the original data therefrom. This may be achieved using successive decoding techniques. Advantageously, the capacity, i.e., the rate of information that can be conveyed with an arbitrarily small probability of error when the instantaneous forward channel condition is unknown to the transmitter, is maximized.
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公开(公告)号：CA2350878A1
公开(公告)日：2002-02-18
申请号：CA2350878
申请日：2001-06-19
Applicant: LUCENT TECHNOLOGIES INC
Inventor： VALENZUELA REINALDO A , LOZANO ANGEL , RASHID-FARROKHI FARROKH
Abstract: Signals are developed for use in a wireless system with multiple transmit a nd multiple receive antennas so that even in the face of some correlation the most open-loop capacity that can be achieved using a substantially open-loop system with a channel of that level of correlation is obtained. In accordance with the principles of the invention, the signals transmitted from the various antennas are processed so as to improve their ability to convey the maximum amount of information. More specifically, the data to be transmitted is divided into M+1 substreams, where M is the number of transmi t antennas. Each transmit antenna is supplied with a combination signal that is made up of a weighted version of a common one of the substreams and a weighted version of a respective one of the substreams that is supplied uniquely for that antenna, so that there are M transmit signals. A receiver having N antennas receives the M transmit signals as combined by the channel and reconstitutes the original data therefrom. This may be achieved using successive decoding techniques. Advantageously, the capacity, i.e., the rate of information that can be conveyed with an arbitrarily small probabili ty of error when the instantaneous forward channel condition is unknown to the transmitter, is maximized.
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公开(公告)号：BR9904973A
公开(公告)日：2000-10-17
申请号：BR9904973
申请日：1999-10-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： RASHID-FARROKHI FARROKH , VALENZUELA REINALDO A
Abstract: The signal to interference and noise ratio (SINR) of wireless systems can be improved, if not optimized, by determining operating parameters used by the base station to substantially simultaneously control the transmit beam patterns that are each formed to establish a communication channel between a base station and a respective one of the wireless terminals as a function of received channel information from at least two of the wireless terminals. In an exemplary embodiment of the invention, the weight vectors and the power allocation employed by a base station are determined by the base station using information supplied by at least each of the wireless terminals served by the base station, and potentially from wireless terminals served by other base stations, e.g., in neighboring cells to the cell served by the base station, the information from the other cells being supplied via the neighboring cell base stations using inter-base-station communication, e.g., a wire line connection.
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