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公开(公告)号：BRPI0100011B1
公开(公告)日：2015-12-29
申请号：BR0100011
申请日：2001-01-04
Applicant: LUCENT TECHNOLOGIES INC
Abstract: processamento em espaço-tempo para sistemas sem fio de multi-entrada e multi-saída em um sistema mimo os sinais transmitidos das várias antenas são processados de modo a melhorar a capacidade do receptor extraí-los do sinal recebido mesmo em face de alguma correlação. mais especificamente, o número de fluxos de bits que são transmitidos simultaneamente é ajustado, por exemplo, reduzido, dependendo do nível de correlação, enquanto versões múltiplas de cada fluxo de bits, ponderadas variadamente, são transmitidas simultaneamente. as versões ponderadas variadamente são combinadas para produzir um sinal ponderado combinado. o receptor processa os sinais recebidos da mesma maneira que ele faria se todos os sinais que atingem as antenas de recepção não tivessem correlação. os vetores de ponderação podem ser determinados pelo transmissor de canal de encaminhamento utilizando as propriedades de canal do enlace de encaminhamento que são tornadas conhecidas do transmissor do enlace de encaminhamento ao serem transmitidas do receptor do enlace de encaminhamento pelo transmissor do enlace inverso ou os vetores de ponderação podem ser determinados pelo transmissor do canal de encaminhamento utilizando as propriedades de canal do enlace de encaminhamento e os vetores de ponderação determinados são tornados conhecidos do transmissor do enlace de encaminhamento ao serem transmitidos do receptor do enlace de encaminhamento pelo transmissor do enlace inverso. as propriedades de canal utilizadas para determinar os vetores de ponderação podem incluir a resposta de canal do transmissor para o receptor e a matriz de covariança de ruído e interferência mensurada no receptor.
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公开(公告)号：DE69937268T2
公开(公告)日：2008-07-03
申请号：DE69937268
申请日：1999-04-07
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FOSCHINI GERARD JOSEPH , GOLDEN GLENN DAVID
Abstract: The bit rate at which a digital wireless communications system communicates data may be significantly increased by using multiple antennas at both the transmitter and receiver and by decomposing the channel into m subchannels that operate in the same frequency band. The system transmits m one dimensional signals and maximizes the minimum signal-to-noise ratio of the receiver detection process.
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公开(公告)号：DE69736504T2
公开(公告)日：2007-01-18
申请号：DE69736504
申请日：1997-06-23
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FOSCHINI GERARD JOSEPH
Abstract: The Shannon limit governs the ultimate bit rate at which a digital wireless communications system may communicate data. A digital wireless receiver may be enhanced such that it approaches the Shannon limit by decomposing a n-dimensional system into n-one dimensional systems of equal capacity.
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公开(公告)号：BR0100011A
公开(公告)日：2001-08-28
申请号：BR0100011
申请日：2001-01-04
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：BR0002525A
公开(公告)日：2001-03-13
申请号：BR0002525
申请日：2000-05-30
Applicant: LUCENT TECHNOLOGIES INC
Abstract: A CDMA wireless communication system for communicating with wireless terminals (110) comprises a channel estimator (114) for determining characteristics of the wireless channels of the wireless terminals. The channel characteristics are used by a code optimizer (118) to assign spreading codes to the wireless terminals. In one embodiment, the code optimizer utilizes an iterative code optimization algorithm and maintains a processing set of wireless terminals. The code optimizer (118) chooses target wireless terminals and performs a random code search in order to find an improved code for the target wireless terminal. The improved code found in the random code search is further improved by performing a gradient search of codes in the signal space in the vicinity of the improved code and by performing a gradient search of transmission delays. The improved codes are transmitted to the wireless terminals (110) for use in reverse link communication.
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Patent Agency Ranking
公开(公告)号：CA2377539A1
公开(公告)日：2001-01-04
申请号：CA2377539
申请日：2000-06-16
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FOSCHINI GERARD JOSEPH , VISWANATHAN HARISH , HUANG HOWARD C
Abstract: High-speed wireless data systems and methods are described for simultaneousl y supporting multiple data users, including flexible mixed-traffic services, using an illustrative CDMA architecture. Embodiments are compatible with current and third generation CDMA systems, while achieving spectral efficiencies that are in some cases an order of magnitude or more higher. Embodiments advantageously employ multiple antennas at the transmitter and receiver and code spreading to realize multiple access systems. Some illustrative receiver embodiments advantageously employ a decorrelating detector, while other features a decorrelating decision-feedback detector. I n typical operation, each of a plurality of high-speed data streams directed t o respective data users is demultiplexed into multiple (G~1) lower rate substreams, which are modulated by a CDMA spreading code and transmitted fro m Mantennas at a base station. A receiver employs Pantennas and multi-user detection to demodulate the Gdata substreams of its associated user. Performance measures for a variety of illustrative transmission and receiver configurations are derived using novel techniques for calculating system level capacities and spectral efficiencies (measured in bits per second per Hertz per sector). System design and configuration tradeoffs are readily made based on such performance determinations.
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公开(公告)号：CA2310175A1
公开(公告)日：2000-12-04
申请号：CA2310175
申请日：2000-05-29
Applicant: LUCENT TECHNOLOGIES INC
Abstract: A CDMA wireless communication system for communicating with wireless terminals. The system comprises a channel estimator for determining characteristics of the wireless channels of the wireless terminals. The channel characteristics are used by a code optimizer to assign spreading codes to the wireless terminals. In one embodiment, the code optimizer utilizes an iterative code optimization algorithm and maintains a processing set of wireless terminals. The code optimizer chooses target wireless terminals and performs a random code search in order to find an improved code for the target wireless terminal. The improved code found in the random code search is further improved by performing a gradient search of codes in the signal space in the vicinity of the improved code and by performing a gradient search of transmission delays. The improved codes are transmitted to the wireless terminals for use in reverse link communication.
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公开(公告)号：CA2377539C
公开(公告)日：2008-12-02
申请号：CA2377539
申请日：2000-06-16
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FOSCHINI GERARD JOSEPH , HUANG HOWARD C , VISWANATHAN HARISH
Abstract: High-speed wireless data systems and methods are described for simultaneously supporting multiple data users, including flexible mixed-traffic services, using an illustrative CDMA architecture. Embodiments are compatible with current and third generation CDMA systems, while achieving spectral efficiencies that are in some cases an order of magnitude or more higher. Embodiments advantageously employ multiple antennas at the transmitter and receiver and code spreading to realize multiple access systems. Some illustrative receiver embodiments advantageously employ a decorrelating detector, while other features a decorrelating decision-feedback detector. In typical operation, each of a plurality of high-speed data streams directed to respective data users is demultiplexed into multiple (G>1) lower rate substreams, which are modulated by a CDMA spreading code and transmitted from M antennas at a base station. A receiver employs P antennas and multi-user detection to demodulate the G data substreams of its associated user. Performance measures for a variety of illustrative transmission and receiver configurations are derived using novel techniques for calculating system level capacities and spectral efficiencies (measured in bits per second per Hertz per sector). System design and configuration tradeoffs are readily made based on such performance determinations.
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公开(公告)号：DE60039099D1
公开(公告)日：2008-07-17
申请号：DE60039099
申请日：2000-12-12
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：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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