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公开(公告)号：JP2000349695A
公开(公告)日：2000-12-15
申请号：JP2000123005
申请日：2000-04-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BUEHRER MICHAEL R , LIU SHANG-CHIEH , NICOLOSO STEVEN PETER
Abstract: PROBLEM TO BE SOLVED: To provide a method for estimating a channel about the wireless communication by generating the initial channel estimated value via a pilot signal contained in a receiving signal, generating the estimated value of a relative data signal from the initial channel estimated value and then generating the new channel estimated value from the estimated data signal. SOLUTION: An initial channel estimator 10 estimates a physical channel distortion via a pilot signal of a received signal and generates the initial channel estimated value. A data estimator 12 estimates the data from the initial channel estimated value according to a prescribed expression and then sets the count value C at 0 to the estimated data. If the count value C set to the estimated value is smaller than the prescribed threshold, the estimator 12 sends the estimated data and the relative count value C to an updated channel estimator 14. The estimator 14 generates the updated channel estimated value from the received estimated data.
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2.发明专利
公开(公告)号：JP2001119328A
公开(公告)日：2001-04-27
申请号：JP2000272659
申请日：2000-09-08
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ALLPRESS STEPHEN A , BUEHRER MICHAEL R , SONI ROBERT ATMARAM
Abstract: PROBLEM TO BE SOLVED: To share the constitution part of a prescribed type regardless of whether a reception device uses orthogonal transmission diversity(OTD) or a a space time spreading(STS) system through the use of a binary switch. SOLUTION: A reception device/transmission device architecture incorporating both opening loop transmission diversities by using plural binary switches is disclosed. The constitution part of a prescribed type can be shared regardless of whether a reception device uses orthogonal transmission diversity(OTD) or a space time spreading system by adopting the binary switch. Thus, the constitution parts of the reception device are reduced and reception device is simplified. Then, the architecture can be implemented on an integrated chip for single application.
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公开(公告)号：JP2001127674A
公开(公告)日：2001-05-11
申请号：JP2000270156
申请日：2000-09-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LI QUINN , ALLPRESS STEPHEN A , BUEHRER MICHAEL R , NAREPIRI S RAMESHU , SONI ROBERT ATMARAM
Abstract: PROBLEM TO BE SOLVED: To realize common transmitter architecture which can be simply installed and which has an orthogonal transmit diversity(OTD) system and a space time spreading(STS) system. SOLUTION: The transmitter 10 has an OTD mode and an STD mode and 1st and 2nd antenna systems. The 1st antenna system 11 has a time multiplexer 12, an inerter 14, switches 16, 26, amplifiers 18, 20, a mixer 22 and an adder 24. The time multiplexer 12 applies time multiplexing to 1st in-phase signals with each other, 1st orthogonal signals with each other, a 2nd in-phase signal and its inverse, and a 2nd orthogonal signal and its inverse, respectively. The mixer 22 mixes the output of the time multiplexer 12 with a Walsh function. The result is fed to the adder 24. Only when the transmitter 10 is set to the STS mode, the switch 26 sends 3rd and 4th mixed time multiplex signals to the adder.
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公开(公告)号：JP2000353993A
公开(公告)日：2000-12-19
申请号：JP2000123004
申请日：2000-04-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BUEHRER MICHAEL R , LIU SHANG-CHIEH , NICOLOSO STEVEN P , UPTEOGROVE DIRCK
Abstract: PROBLEM TO BE SOLVED: To provide a channel prediction which changes together with environments fluctuating at high speed by assuming that the channel linearly changes to a time and executing linear regression to a sample in a sampling window of a first signal component in a reception signal. SOLUTION: A frequency offset prediction value f"(t) is generated by a frequency offset predicator 10 by using a known signal component in a reception signal and is outputted together with a reception symbol r(t). A frequency offset compensator 12 uses the frequency offset prediction value f"(t) and generates a reception symbol r'(t) compensated by known and unknown signal components in the reception signal. A channel predicator 14 generates a channel prediction value g'(t) which constitutes a linear regression coefficient by using the reception symbol r'(t) whose known signal component is compensated and a window size. A channel compensator 16 compensates a channel distortion in the reception symbol r'(t) by using the channel prediction value g'(t).
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公开(公告)号：JP2001211104A
公开(公告)日：2001-08-03
申请号：JP2000372278
申请日：2000-12-07
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BUEHRER MICHAEL R , LIU SHANG-CHIEH
IPC: H04B1/7075 , H04B1/7105 , H04B1/7115 , H04B7/08 , H04B7/26 , H04L7/00 , H04B1/707
Abstract: PROBLEM TO BE SOLVED: To actualize a CDMA system and its operating method which reduce interference by using an antenna array and improve signal acquisition and signal processing with an appropriate calculational quantity. SOLUTION: This system has a base station which is connected to the array antenna composed of plural antennas and serves plural users. A receiver 20 in the base station has a universally reverse cross correlation matrix which is connected to the antenna array, and signal acquiring circuits and signal processing circuits 22 which serve the respective users. Each signal acquiring circuit has a column of delay stages. At each stage, an input antenna signal and a spread code are correlated and coupled by a multiplier connected to the universally reverse cross correlation matrix to improve the time delay estimation of signal acquisition. Each multiplier couples the signal after the correlation of its stage with the output of the universally reverse cross correlation matrix to generate a signal amplitude representing the signal energy of an antenna path a in a given period.
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Patent Agency Ranking
公开(公告)号：JP2001028559A
公开(公告)日：2001-01-30
申请号：JP2000113922
申请日：2000-04-14
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BUEHRER MICHAEL R , SONI ROBERT ATMARAM , TSAI JIANN-AN
Abstract: PROBLEM TO BE SOLVED: To allow a mobile station to conduct downlink diversity employing a Walsh code in wireless mobile communication, without the need for addition of reception antenna, without wastage of frequency bandwidth or causing self- interference. SOLUTION: In a CDMA system 100, consisting of K-sets of mobile stations 106-1 to 106-K and one base station 102 relating to them, the base station 102 modulates a Walsh code by each data signal of at least part of the mobile stations among K-sets of the mobile stations, generates a transmission signal denoting the result and uses M-sets of transmission antennas 104-1 to 104-M of the base station 102 to transmit the transmission signal. The Walsh code is selected from among 2n sets of Walsh codes (where n is an integer according to an expression that uses an 'upper limit operator' to surround log2(K)). The mobile station 106-K receives transmission signals, applies correlation processing to M-sets of the received signals by using M-sets of Walsh codes and obtains data estimate values of the mobile station by linearly combining the respective results by M-sets of correlation processing sets, through the use of a transmission matrix and obtained channel estimate values.
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公开(公告)号：DE60028857D1
公开(公告)日：2006-08-03
申请号：DE60028857
申请日：2000-04-11
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BUEHRER MICHAEL R , SONI ROBERT ATMARAM , TSAI JIANN-AN
Abstract: Downlink diversity in a COMA system is provided by employing Walsh codes in 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 modulated by a data signal associated with that particular mobile. The set of Walsh codes to select from includes 2 ”Œlog 2 ( 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 of the 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：DE60035466T2
公开(公告)日：2008-03-13
申请号：DE60035466
申请日：2000-09-04
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ALLPRESS STEPHEN ALAN , BUEHRER MICHAEL R , 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：DE60040122D1
公开(公告)日：2008-10-16
申请号：DE60040122
申请日：2000-06-20
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BUEHRER MICHAEL R , HAHM MARK D , LIU SHANG-CHIEH , NICOLOSO STEVEN P
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：AT367018T
公开(公告)日：2007-08-15
申请号：AT00307633
申请日：2000-09-04
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ALLPRESS STEPHEN ALAN , BUEHRER MICHAEL R , 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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