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公开(公告)号：JP2001069122A
公开(公告)日：2001-03-16
申请号：JP2000196333
申请日：2000-06-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BUEHRER R MICHAEL , HAHM MARK D , LIU SHANG-CHIEH , NICOLOSO STEVEN P
Abstract: PROBLEM TO BE SOLVED: To use an ordinary signal processor without requiring a very fast and expensive processor by making control information include acquired data on at least one of user signals to be processed. SOLUTION: A controller 204 supplies acquired user signals and control signal for discriminating timing information on them to a parallel cancellation chip(PCC) 200. Prior to reception of this information for a specific user signal, the PCC 200 sends signals received by 1st, 2nd, and 3rd antenna, pairs α, β, and γ to 1st to (k)th signal processing chips(SPC) 202-1 to 202-n. This constitution does not requires very fast and expensive processor because of the constitution of the cancellation chip and can use an ordinary signal processor.
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公开(公告)号：JP2001237750A
公开(公告)日：2001-08-31
申请号：JP2000381285
申请日：2000-12-15
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BENNING ROGER DAVID , BUEHRER R MICHAEL , SONI ROBERT ATMARAN
Abstract: PROBLEM TO BE SOLVED: To enhance diversity gain, without lowering data rate by increasing the number of antenna elements for improving S/N of a receiver. SOLUTION: A transmission diversity signal processing method uses an antenna array 23, consisting of a 1st antenna group (>=2 antenna elements) 24-1 and a 2nd antenna group (>=1 antenna elements) 24-2 placed at a distance of about 10 carrier waves set between them and is used for a radio communication system. In this signal processing method, the 1st and 2nd plural representative data streams are produced from signals by using the different orthogonal codes (Walsh codes). The 1st plural representative data streams are encoded (PN code) to shift their phases and then transmitted through the antenna group 24-1 and the 2nd plural representative data streams are encoded (PN code) and transmitted through the antenna group 24-2 respectively.
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公开(公告)号：CA2317621C
公开(公告)日：2004-03-23
申请号：CA2317621
申请日：2000-09-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LI QUINN , ALLPRESS STEPHEN ALAN , RAMESH NALLEPILLI S , BUEHRER R MICHAEL , SONI ROBERT ATMARAM
Abstract: Disclosed is a common transmitter architecture having incorporated both op en loop transmit diversity schemes using a plurality of binary switches. Employment of binary switches allows for the sharing of certain components whether the transmitte r is utilizing a orthogonal transmit diversity (OTD) scheme or a space time spreading (STS) scheme. Accordingly, the number of components in the transmitter is minimized and th e complexity of the transmitter is simple enough to be implemented into a single application specific integrated chip.
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公开(公告)号：BR0003984A
公开(公告)日：2001-04-17
申请号：BR0003984
申请日：2000-09-04
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ALLPRESS STEPHEN ALAN , BUEHRER R MICHAEL , SONI ROBERT ATMARAM
Abstract: Disclosed is a receiver transmitter architecture having incorporated both open loop transmit diversity schemes using a plurality of binary switches. Employment of binary switches allows for the sharing of certain components whether the receiver is utilizing a orthogonal transmit diversity (OTD) scheme or a space time spreading (STS) scheme. Accordingly, the number of components in the receiver is minimized and the complexity of the receiver is simple enough to be implemented into a single application specific integrated chip.
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公开(公告)号：CA2326865C
公开(公告)日：2005-11-01
申请号：CA2326865
申请日：2000-11-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SONI ROBERT ATMARAM , BUEHRER R MICHAEL , BENNING ROGER DAVID
Abstract: Disclosed is a method and apparatus for enhancing diversity gain withou t reducing data rate by increasing the number of antenna elements and configuring the antenna elements for improving signal-to-noise ratio at a receiver. The antenna arra y comprise a first antenna group with at least two antenna elements and a second antenna group with at least one antenna element. The first and second antenna groups are spaced approximatel y ten carrier wavelengths or more apart from each other, and the antenna elements belongin g to the first antenna group are spaced approximately a half carrier wavelength or less apa rt from each other. A plurality of data streams is generated from a signal and used to produce a first and second plurality of representative data streams. Each of the first plurality of representative data streams is phase-shifted and encoded using different orthogonal codes, and each of t he second plurality of representative data streams is encoded using different orthogonal codes, wherein a different orthogonal code is used to encode representative data streams in the first a nd second plurality of representative data streams generated from a same data stream, and the first and second plurality of representative data streams allow for the plurality of data streams to be recovered at a receiver after encoding. The encoded and phase shifted first plurality of representative data streams being transmitted over the first antenna group, and the encoded second plurality o f representative data streams being transmitted over the second antenna group.
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Patent Agency Ranking
公开(公告)号：CA2326865A1
公开(公告)日：2001-06-15
申请号：CA2326865
申请日：2000-11-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SONI ROBERT ATMARAM , BUEHRER R MICHAEL , BENNING ROGER DAVID
Abstract: Disclosed is a method and apparatus for enhancing diversity gain withou t reducing data rate by increasing the number of antenna elements and configuring the antenna elements for improving signal-to-noise ratio at a receiver. The antenna arra y comprise a first antenna group with at least two antenna elements and a second antenna group with at least one antenna element. The first and second antenna groups are spaced approximatel y ten carrier wavelengths or more apart from each other, and the antenna elements belongin g to the first antenna group are spaced approximately a half carrier wavelength or less apa rt from each other. A plurality of data streams is generated from a signal and used to produce a first and second plurality of representative data streams. Each of the first plurality of representative data streams is phase-shifted and encoded using different orthogonal codes, and each of t he second plurality of representative data streams is encoded using different orthogonal codes, wherein a different orthogonal code is used to encode representative data streams in the first a nd second plurality of representative data streams generated from a same data stream, and the first and second plurality of representative data streams allow for the plurality of data streams to be recovered at a receiver after encoding. The encoded and phase shifted first plurality of representative data streams being transmitted over the first antenna group, and the encoded second plurality o f representative data streams being transmitted over the second antenna group.
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公开(公告)号：BR0003995A
公开(公告)日：2001-04-17
申请号：BR0003995
申请日：2000-09-05
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LI QUINN , RAMESH NALLEPILLI S , SONI ROBERT ATMARAM , BUEHRER R MICHAEL , ALLPRESS STEPHEN ALAN
Abstract: Disclosed is a common transmitter architecture having incorporated both open loop transmit diversity schemes using a plurality of binary switches. Employment of binary switches allows for the sharing of certain components whether the transmitter is utilizing a orthogonal transmit diversity (OTD) scheme or a space time spreading (STS) scheme. Accordingly, the number of components in the transmitter is minimized and the complexity of the transmitter is simple enough to be implemented into a single application specific integrated chip.
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公开(公告)号：BR0002785A
公开(公告)日：2001-01-30
申请号：BR0002785
申请日：2000-06-21
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BUEHRER R MICHAEL , HAHM MARK DAVID , LIU SHANG-CHIEH , NICOLOSO STEVEN PETER
Abstract: The base station system includes a cancellation processor connected to a plurality of conventional signal processors. Under the control of a controller, the signal processors acquire user signals in signals received by the base station antennas. The controller controls the cancellation processor to perform cancellation operations with respect to the acquired user signals. The cancellation processor includes first-nth filter stages. Each filter stage operates in the same manner. A filter stage obtains, in parallel, the acquired user signals from signals supplied thereto by estimating symbols in the acquired user signals under the control of the controller. The cancellation processor also includes a cancellation stage associated with each filter stage. Each cancellation stage cancels, in parallel, the obtained user signals output from the associated filter stage from the signals received by the base station antennas. The resulting residual signals output from a cancellation stage are supplied to the next filter stage, and the signals supplied to the first filter stage are the signals received by the base station antennas. A cancellation stage cancels the obtained user signals received thereby from the received signals at a substantially same time with respect to the received signals.
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公开(公告)号：CA2304532C
公开(公告)日：2007-06-26
申请号：CA2304532
申请日：2000-04-10
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BUEHRER R MICHAEL , SONI ROBERT ATMARAM , TSAI JIANN-AN
Abstract: Downlink diversity in a CDMA system is provided by employing Walsh codes i n conjunction with M transmit antennas at a common base station serving K mobiles, where M may or may not be to equal to K. The present invention provides methods and apparatus for improving downlink diversity in a CDMA system. Each transmit antenna transmits a signal representing the result of the modulation of Walsh codes by data signals for each of the K mobiles, assuming there is data pertaining to a particular mobile. The assignment of Walsh codes is accomplished in accordance with a transmission matrix T. The transmission matrix maps the user data symbols onto the Walsh codes for each antenna and is preferably designed such that its columns are representative of the transmit antennas and orthogonal. Thus, at a given mobile, the mobile need only correlate with M different Walsh codes since each transmit signal received contains a component that is the result of M different Walsh codes having been modulate d by a data signal associated with that particular mobile. The set of Walsh codes to select from includes 2[log2(K)] Walsh codes. However, with respect to any given mobile, there is needed only as many different Walsh codes as there are transmit antennas serving the particular mobile. The results ofthe respective M correlations are combined and, with obtained channel estimates, the receiver estimates the particular data pertaining to that particular mobile so that it can be provided to the user. Also, the present invention provides for various ways to estimate the respective channels between the M transmit antennas and a mobile. It is to be appreciated that the downlink diversity techniques of the invention may be applied to the physical layer proposed in the IS95-C physical layer draft proposal.
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公开(公告)号：CA2392668A1
公开(公告)日：2003-01-30
申请号：CA2392668
申请日：2002-07-05
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SONI ROBERT ATMARAM , BENNING ROGER DAVID , BUEHRER R MICHAEL
Abstract: Disclosed is a method and apparatus of transmit diversity that is backward compatible and does not significantly degrade performance in additi ve white guassan noise (AWGN) conditions using a transmission architecture that incorporates a form of phase sweep transmit diversity (PSTD) referred to herein as biased PSTD. Biased PSTD involves transmitting a signal and a frequency swep t version of the same signal over diversity antennas at different power levels . By transmitting the two signals at different power levels, the depths of nulls normally seen in AWGN conditions when PSTD is utilized is reduced and performance degradation in AWGN conditions is mitigated.
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