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公开(公告)号：DE69932118T2
公开(公告)日：2006-11-30
申请号：DE69932118
申请日：1999-04-27
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LUSCHI CARLO , SANDELL MAGNUS , MUJTABA SYED AON , STRAUCH PAUL EDWARD , TEN BRINK STEPHAN DIPL ING , YAN RAN-HONG
Abstract: A method of estimating channel impulse response in a signal transmitted over a channel in a communication system is described. The channel estimator obtains a priori knowledge about the transmitted signal, and then uses the transmitted signal and the a priori knowledge to choose an estimate of channel impulse response which minimizes the expected distance between the transmitted signal and a reconstructed signal. The expected distance that is minimized is a cost function, represented by E{∥r-Bh∥2r}. By using soft decision feedback, the invention minimizes erroneous decision feedback which can cause error propagation. The decisions are usually in the form of log likelihood ratios (LLR).
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公开(公告)号：DE69826415D1
公开(公告)日：2004-10-28
申请号：DE69826415
申请日：1998-11-03
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MUJTABA SYED AON
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13.发明专利
公开(公告)号：CA2287022C
公开(公告)日：2004-06-08
申请号：CA2287022
申请日：1999-10-20
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MUJTABA SYED AON
Abstract: Methods and apparatus for wireless communication in systems such as omni-be am and narrow-beam fixed wireless loop (FWL) systems. In a first technique in accordance with the invention, referred to as code division duplex (CDD) time-slotted CDMA, uplink and downlink portions of the system are separated using code division duplexing, while the users within a given cell are also separated using codes, e.g., using time- slotted CDMA. In a second technique in accordance with the invention, referred to as time division duplex (TDD) time-slotted CDMA, uplink and downlink portions of the system are separated using time division duplexing, e.g., time slots, while the users in a given cell a re separated using codes, e.g., time-slotted CDMA. Both the CDD and TDD techniques may make use of an electronically-steered beam which is designed to provide simultaneous covera ge within a given cell for two or more users separated by codes. In a third technique in accordance with the invention, referred to as orthogonal frequency division multiplexing (OFDM), uplink and downlink portions of the system are separated in frequency, while the users are, e.g., also separated in frequency.
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14.发明专利
公开(公告)号：CA2286417A1
公开(公告)日：2000-05-25
申请号：CA2286417
申请日：1999-10-18
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MUJTABA SYED AON
Abstract: Methods and apparatus for wireless communication in systems such as omni-beam and narrow-beam fixed wireless loop (FWL) systems. In a first technique in accordance with the invention, referred to as code division duplex (CDD) time-slotted CDMA, uplink and downlink portions of the system are separated using code division duplexing, while the users within a given cell are also separated using codes, e.g., using timeslotted CDMA. In a second technique in accordance with the invention, referred to as time division duplex (TDD) time-slotted CDMA, uplink and downlink portions of the system are separated using time division duplexing, e.g., time slots, while the users in a given cell are separated using codes, e.g., time-slotted CDMA Both the CDD and TDD techniques may make use of an electronically-steered beam which is designed to provide simultaneous coverage within a given cell for two or more users separated by codes. In a third technique in accordance with the invention, referred to as orthogonal frequency division multiplexing (OFDM), uplink and downlink portions of the system are separated in frequency, while the users are, e.g., also separated in frequency.
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公开(公告)号：AU2400899A
公开(公告)日：1999-11-11
申请号：AU2400899
申请日：1999-04-27
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LUSCHI CARLO , BRINK STEPHAN TEN , YAN RAN-HONG , STRAUCH PAUL EDWARD , SANDELL MAGNUS , MUJTABA SYED AON
Abstract: A method of estimating channel impulse response in a signal transmitted over a channel in a communication system is described. The channel estimator obtains a priori knowledge about the transmitted signal, and then uses the transmitted signal and the a priori knowledge to choose an estimate of channel impulse response which minimizes the expected distance between the transmitted signal and a reconstructed signal. The expected distance that is minimized is a cost function, represented by E{∥r-Bh∥2r}. By using soft decision feedback, the invention minimizes erroneous decision feedback which can cause error propagation. The decisions are usually in the form of log likelihood ratios (LLR).
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Patent Agency Ranking
公开(公告)号：BR0101967A
公开(公告)日：2002-01-02
申请号：BR0101967
申请日：2001-05-14
Applicant: LUCENT TECHNOLOGIES INC
Inventor： GABARA THADDEUS JOHN , MUJTABA SYED AON
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17.发明专利
公开(公告)号：CA2287022A1
公开(公告)日：2000-05-25
申请号：CA2287022
申请日：1999-10-20
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MUJTABA SYED AON
Abstract: Methods and apparatus for wireless communication in systems such as omni-beam and narrow-beam fixed wireless loop (FWL) systems. In a first technique in accordance with the invention, referred to as code division duplex (CDD) time-slotted CDMA, uplink and downlink portions of the system are separated using code division duplexing, while the users within a given cell are also separated using codes, e.g., using timeslotted CDMA. In a second technique in accordance with the invention, referred to as time division duplex (TDD) time-slotted CDMA, uplink and downlink portions of the system are separated using time division duplexing, e.g., time slots, while the users in a given cell are separated using codes, e.g., time-slotted CDMA. Both the CDD and TDD techniques may make use of an electronically-steered beam which is designed to provide simultaneous coverage within a given cell for two or more users separated by codes. In a third technique in accordance with the invention, referred to as orthogonal frequency division multiplexing (OFDM), uplink and downlink portions of the system are separated in frequency, while the users are, e.g., also separated in frequency.
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18.发明专利
公开(公告)号：CA2287004A1
公开(公告)日：2000-05-25
申请号：CA2287004
申请日：1999-10-19
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MUJTABA SYED AON
Abstract: Methods and apparatus for wireless communication in systems such as omni-beam and narrow-beam fixed wireless loop (FWL) systems. In a first technique in accordance with the invention, referred to as code division duplex (CDD) time-slotted CDMA, uplink and downlink portions of the system are separated using code division duplexing, while the users within a given cell are also separated using codes, e.g., using timeslotted CDMA. In a second technique in accordance with the invention, referred to as time division duplex (TDD) time-slotted CDMA, uplink and downlink portions of the system are separated using time division duplexing, e.g., time slots, while the users in a given cell are separated using codes, e.g., time-slotted CDMA. Both the CDD and TDD techniques may make use of an electronically-steered beam which is designed to provide simultaneous coverage within a given cell for two or more users separated by codes. In a third technique in accordance with the invention, referred to as orthogonal frequency division multiplexing (OFDM), uplink and downlink portions of the system are separated in frequency, while the users are, e.g., also separated in frequency.
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19.发明专利
公开(公告)号：CA2287004C
公开(公告)日：2004-12-07
申请号：CA2287004
申请日：1999-10-19
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MUJTABA SYED AON
Abstract: Methods and apparatus for wireless communication in systems such as omni-be am and narrow-beam fixed wireless loop (FWL) systems. In a first technique in accordance with the invention, referred to as code division duplex (CDD) time-slotted CDMA, uplink and downlink portions of the system are separated using code division duplexing, while the users within a given cell are also separated using codes, e.g., using time- slotted CDMA. In a second technique in accordance with the invention, referred to as time division duplex (TDD) time-slotted CDMA, uplink and downlink portions of the system are separated using time division duplexing, e.g., time slots, while the users in a given cell a re separated using codes, e.g., time-slotted CDMA. Both the CDD and TDD techniques may make use of an electronically-steered beam which is designed to provide simultaneous covera ge within a given cell for two or more users separated by codes. In a third technique in accordance with the invention, referred to as orthogonal frequency division multiplexing (OFDM), uplink and downlink portions of the system are separated in frequency, while the users are, e.g., also separated in frequency.
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公开(公告)号：AU4603801A
公开(公告)日：2001-11-29
申请号：AU4603801
申请日：2001-05-17
Applicant: LUCENT TECHNOLOGIES INC
Inventor： GABARA THADDEUS JOHN , MUJTABA SYED AON
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