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公开(公告)号：JP2002314510A
公开(公告)日：2002-10-25
申请号：JP2002033472
申请日：2002-02-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FOSCHINI GERARD J , PAPADIAS CONSTANTINOS B
Abstract: PROBLEM TO BE SOLVED: To provide a method and apparatus for increasing the capacity of a multiple-input and/or multiple-output system. SOLUTION: The method to be used by a system for communicating primitive data streams in this invention is characterized by that the method includes a step of transmitting at least part of each of a plurality of processed sub- streams, where the primitive data stream includes a plurality of sub-streams and each sub-stream includes a plurality of sub-stream component data streams. Each processed sub-stream represents each sub-stream, each processed sub-stream includes a plurality of strata, each stratum of each processed sub-stream represents one of the component data streams represented by the processed sub-streams and one of the sub-stream components respectively.
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公开(公告)号：DE602005003703T2
公开(公告)日：2008-12-04
申请号：DE602005003703
申请日：2005-04-22
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LEUNG KINK K , PAPADIAS CONSTANTINOS B
Abstract: A channel for communicating traffic between two transceivers (10, 20) is assigned based on the communication of messages between those two transceivers (10, 20). A first transceiver (10) sends a request message over a plurality of possible communication channels. The second transceiver (20) selects one of the channels over which a request message was received, and responds to the request over the channel selected. The first transceiver (10) then assigns the channel for communicating traffic based on receipt of the response on the selected channel.
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公开(公告)号：BR0101646A
公开(公告)日：2001-12-26
申请号：BR0101646
申请日：2001-04-30
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LI XIAODONG , PAPADIAS CONSTANTINOS B , VISWANATHAN HARISH
Abstract: Wireless communications for frequency-selective fading channels is realized by employing a system including orthogonal frequency division multiplexing (OFDM) in combination with an at least two antenna transmit diversity arrangement. Specifically, OFDM converts a multipath channel into a plurality of narrowband subchannels each having flat fading. Then, the signals on the same frequency subchannels of the at least two antennas are grouped together. Considering a first frequency subchannel, during a first OFDM time interval, a first signal and a second signal are transmitted on the first frequency subchannel from a first antenna (0) and from a second antenna (1), respectively. During a second OFDM time interval, a reverse sign (-) complex conjugate of the second signal and a complex conjugate of the first signal are transmitted from the first antenna and the second antenna, respectively. In a specific embodiment of the invention, reduced complexity in the implementation is realized by a reverse order complex conjugate and a reverse order, reverse sign (-) complex conjugate and judicious selection of the processed data signals in order to transmit the appropriate ones of the signals during the first and second OFDM intervals. Again, if the channel remains constant over the two OFDM intervals, diversity combination is realized for each frequency subchannel. In another embodiment of the invention, antenna-group hopping is employed in conjunction with pairing in time of the OFDM frequency subchannel signals to realize increased transmit diversity without rate loss.
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公开(公告)号：DE602005003703D1
公开(公告)日：2008-01-24
申请号：DE602005003703
申请日：2005-04-22
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LEUNG KINK K , PAPADIAS CONSTANTINOS B
Abstract: A channel for communicating traffic between two transceivers (10, 20) is assigned based on the communication of messages between those two transceivers (10, 20). A first transceiver (10) sends a request message over a plurality of possible communication channels. The second transceiver (20) selects one of the channels over which a request message was received, and responds to the request over the channel selected. The first transceiver (10) then assigns the channel for communicating traffic based on receipt of the response on the selected channel.
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公开(公告)号：DE602004004237T2
公开(公告)日：2007-06-28
申请号：DE602004004237
申请日：2004-11-05
Applicant: LUCENT TECHNOLOGIES INC
Inventor： AVIDOR DAN , LING JONATHAN , PAPADIAS CONSTANTINOS B
Abstract: In a method of determining a beam to be generated for a user, a user may be selected from a user population based on a parameter that is tracked for each user in the user population, and a beam preferred by the selected user may be determined. The preferred beam may be generated and used by a base station to transmit a pilot signal to the user population. Each user of the user population responds to the pilot signal. The base station may run a scheduling algorithm and schedule a user based on feedback received from all the users in the user population, and information may be transmitted to the scheduled user using the preferred beam.
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Patent Agency Ranking
公开(公告)号：DE602004004237D1
公开(公告)日：2007-02-22
申请号：DE602004004237
申请日：2004-11-05
Applicant: LUCENT TECHNOLOGIES INC
Inventor： AVIDOR DAN , LING JONATHAN , PAPADIAS CONSTANTINOS B
Abstract: In a method of determining a beam to be generated for a user, a user may be selected from a user population based on a parameter that is tracked for each user in the user population, and a beam preferred by the selected user may be determined. The preferred beam may be generated and used by a base station to transmit a pilot signal to the user population. Each user of the user population responds to the pilot signal. The base station may run a scheduling algorithm and schedule a user based on feedback received from all the users in the user population, and information may be transmitted to the scheduled user using the preferred beam.
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公开(公告)号：DE60101304T2
公开(公告)日：2004-09-09
申请号：DE60101304
申请日：2001-08-28
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FOSCHINI GERARD J , PAPADIAS CONSTANTINOS B
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公开(公告)号：DE60101304D1
公开(公告)日：2004-01-08
申请号：DE60101304
申请日：2001-08-28
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FOSCHINI GERARD J , PAPADIAS CONSTANTINOS B
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公开(公告)号：AU4028701A
公开(公告)日：2001-11-15
申请号：AU4028701
申请日：2001-05-02
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LI XIADONG , VISWANATHAN HARISH , PAPADIAS CONSTANTINOS B
Abstract: Wireless communications for frequency-selective fading channels is realized by employing a system including orthogonal frequency division multiplexing (OFDM) in combination with an at least two antenna transmit diversity arrangement. Specifically, OFDM converts a multipath channel into a plurality of narrowband subchannels each having flat fading. Then, the signals on the same frequency subchannels of the at least two antennas are grouped together. Considering a first frequency subchannel, during a first OFDM time interval, a first signal and a second signal are transmitted on the first frequency subchannel from a first antenna (0) and from a second antenna (1), respectively. During a second OFDM time interval, a reverse sign (-) complex conjugate of the second signal and a complex conjugate of the first signal are transmitted from the first antenna and the second antenna, respectively. In a specific embodiment of the invention, reduced complexity in the implementation is realized by a reverse order complex conjugate and a reverse order, reverse sign (-) complex conjugate and judicious selection of the processed data signals in order to transmit the appropriate ones of the signals during the first and second OFDM intervals. Again, if the channel remains constant over the two OFDM intervals, diversity combination is realized for each frequency subchannel. In another embodiment of the invention, antenna-group hopping is employed in conjunction with pairing in time of the OFDM frequency subchannel signals to realize increased transmit diversity without rate loss.
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10.发明专利
公开(公告)号：CA2341808A1
公开(公告)日：2001-11-09
申请号：CA2341808
申请日：2001-03-23
Applicant: LUCENT TECHNOLOGIES INC
Inventor： PAPADIAS CONSTANTINOS B , VISWANATHAN HARISH , LI XIAODONG
Abstract: Wireless communications for frequency-selective fading channels is realized by employing a system including orthogonal frequency division multiplexing (OFDM) in combination with an at least two antenna transmit diversity arrangement. Specifically, OFDM converts a multipath channel into a plurality of narrowband subchannels each having flat. fading. Then, the signals on the same frequency subchannels of the at least two antennas are grouped together. Considering a first frequency subchannel, during a first OFDM time interval, a first signal and a second signal are transmitted on the first frequency subchannel from a first antenna (0) and from a second antenna (1), respectively. During a second OFDM time interval, a reverse sign (-) complex conjugate of the secon d signal and a complex conjugate of the first signal are transmitted from the first antenna and the second antenna, respectively. In a specific embodiment of th e invention, reduced complexity in the implementation is realized by a reverse order complex conjugate and a reverse order, reverse sign (-) complex conjugate an d judicious selection of the processed data signals in order to transmit the appropriate ones of the signals during the first and second OFDM intervals. Again, if the channel remains constant over the two OFDM intervals, diversi ty combination is realized for each frequency subchannel. In another embodiment of the invention, antenna-group hopping is employed in conjunction with pairing in time of the OFDM frequency subchannel signals to realize increased transmit diversity without rate loss.
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