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公开(公告)号：JP2004007842A
公开(公告)日：2004-01-08
申请号：JP2003311745
申请日：2003-09-03
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FOSCHINI GERARD JOSEPH
Abstract: PROBLEM TO BE SOLVED: To improve the bit rate of a digital radio communication system. SOLUTION: A receiver 50 is made of a plurality of antenna elements 55-1 to 55-n which receive signals sent from a transmitter having a plurality of transmission antenna elements as signal vectors, a signal preprocessing unit 60 and a decoder 65. The preprocessing unit 60 preprocesses the signal vector. Preprocessing is conducted by subtracting a decoding result obtained by decoding the signal vector preprocessed by the preprocessing unit 60 from the signal vector under processing and nullifying elements of the signal vector having been received after the signal vector under processing and not processed yet from the signal vector under processing. The decoder 65 decodes the result obtained from the preprocessing of the signal vector. COPYRIGHT: (C)2004,JPO
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公开(公告)号：JPH1084324A
公开(公告)日：1998-03-31
申请号：JP17607097
申请日：1997-07-01
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FOSCHINI GERARD JOSEPH
Abstract: PROBLEM TO BE SOLVED: To increase a data transmission bit rate to a value very close to a limit of Shannon by devising the digital radio communication system so that an n-dimension system is disassembled into (n)sets of linear systems with the same capacity (processing capability) so as to conduct interference elimination processing among the signals. SOLUTION: A receiver 50 is made up of a plurality of antenna elements 55-1-55-n which receive a signal sent from a transmitter having a plurality of transmission antenna elements as a signal vector, a signal pre-processing unit 60 and a decoder 65. The pre-processing unit 60 applies preliminary processing to the signal vector. The preliminary processing is conducted by subtracting a decoding result obtained by decoding the signal vector subjected to preliminary processing by the pre-processing unit 60 from the signal vector under processing at present and nullifying elements of the signal vector having been received after the signal vector under processing at present and not processed yet from the signal vector under processing at present. The decoder 65 decodes the result obtained from the preliminary processing of the signal vector.
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公开(公告)号：JP2001237751A
公开(公告)日：2001-08-31
申请号：JP2001003612
申请日：2001-01-11
Applicant: LUCENT TECHNOLOGIES INC
Abstract: PROBLEM TO BE SOLVED: To provide a method and a device which can process signals to be transmitted from various antenna, for improving the capability of a receiver that extracts these transmitting signals from the received signals, regardless of some correlations in a MIMO system. SOLUTION: The number of bit streams to be transmitted simultaneously is adjusted and decreased, according to the correlation level, and at the same time plural versions of every bit stream weighted in various ways are transmitted at the same time. These weighted versions are coupled together for generating a single-coupled weighting signal. A receiver processes the received signals, as through all signals arrived at a receiving antenna with no correlation. A weight vector can be decided with a forward channel transmitter, by making use of the channel characteristic of a forward link that is notified to a transmitter of a forward link when the channel characteristic is transmitted from a receiver of a forward link via a transmitter of a reverse link.
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公开(公告)号：JP2001016185A
公开(公告)日：2001-01-19
申请号：JP2000166157
申请日：2000-06-02
Applicant: LUCENT TECHNOLOGIES INC
Abstract: PROBLEM TO BE SOLVED: To reduce all interference between wireless terminals by allocating codes to plural wireless terminals based on decided plural channel characteristics. SOLUTION: A combined signal is transmitted to a simultaneous channel estimator 114 and a space-time matched filter 116. The simultaneous channel estimator 114 receives a base band signal and decides characteristics κpk of a wireless channel where the signal is received. A base station 102 has a code optimizer 118 for allocating a code to a wireless terminal. A processing set is initialized with respect to one of the wireless terminals. A target wireless terminal is selected from the processing set. When there is only one wireless terminal in the processing set, the wireless terminal is selected as the target wireless terminal. Regarding the wireless terminal selected as the target, random code search is executed.
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公开(公告)号：DE60008040D1
公开(公告)日：2004-03-11
申请号：DE60008040
申请日：2000-05-23
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：CA2327611C
公开(公告)日：2006-01-24
申请号：CA2327611
申请日：2000-12-05
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 be en 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 li nk by the transmitter of the reverse link or the weight vectors may be determined by t he 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 bein g 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：DE60008040T2
公开(公告)日：2004-08-26
申请号：DE60008040
申请日：2000-05-23
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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公开(公告)号：DE69937268D1
公开(公告)日：2007-11-22
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：DE69736504D1
公开(公告)日：2006-09-28
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：CA2327611A1
公开(公告)日：2001-07-13
申请号：CA2327611
申请日：2000-12-05
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 be en 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 li nk by the transmitter of the reverse link or the weight vectors may be determined by t he 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 bein g 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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