Patents by Inventor Jiann-An Tsai
Jiann-An Tsai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7536205Abstract: A base station for communicating with mobile stations in a coverage area of the wireless network. The base station comprises: 1) a transceiver for transmitting downlink OFDMA signals to each mobile station; 2) an antenna array for transmitting the downlink OFDMA signals to the mobile stations using spatially directed beams; and 3) an SDMA scheduling controller for scheduling downlink transmissions to the mobile stations. The SDMA scheduling controller determines a first mobile station having a highest priority and schedules the first mobile station for downlink transmission in a particular time-frequency slot. The SDMA scheduling controller then determines additional mobile stations that are spatially uncorrelated with the first mobile station, as well as each other, and schedules the additional mobile stations for downlink transmission in that particular time-frequency slot according to priority.Type: GrantFiled: May 13, 2005Date of Patent: May 19, 2009Assignee: Samsung Electronics Co., Ltd.Inventors: Cornelius Van Rensburg, Jiann-An Tsai, Lai King Tee
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Publication number: 20090041150Abstract: A method includes broadcasting, at a transmitter, messages comprising antenna configuration, antenna spacing and a number of antenna of the transmitter and reference signals; generating, at a receiver, a codebook comprising a plurality of antenna beams based on the broadcasted messages; receiving, at the receiver, the broadcasted reference signals; selecting, at the receiver, an antenna beam among the plurality of antenna beams within the codebook in dependence upon a predetermined performance criteria of a data communication system and in dependence upon the broadcasted reference signals; feedbacking to the transmitter, at the receiver, information comprising the antenna beam selected by the receiver; optimizing, at the transmitter, a beamforming process by utilizing the feedback information from the receiver; transmitting, at the transmitter, data signals by utilizing the optimized beamforming process; and receiving and processing, at the receiver, the data signals in dependence upon the selected antenna beType: ApplicationFiled: April 25, 2008Publication date: February 12, 2009Inventors: Jiann-An Tsai, Cornelius Van Rensburg, Jianzhong Zhang
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Publication number: 20080304593Abstract: Methods and apparatus for transmitting data via multiple antennas by using antenna diversity. A transmission diversity scheme is established such that two transmission matrices that are in accordance with the space frequency block code combined with Frequency switched transmit diversity (SFBC+FSTD) scheme, are alternatively applied in either the frequency domain, or the time domain, or both of the frequency domain or then time domain. The symbols in the transmission matrices may be transmitted either as one burst in a primary broadcast channel (PBCH), or as discrete bursts in the primary broadcast channel.Type: ApplicationFiled: May 13, 2008Publication date: December 11, 2008Inventors: Farooq Khan, Jiann-An Tsai, Jianzhong Zhang
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Publication number: 20080279301Abstract: A method from transmitting data via multiple antennas. The method contemplates modulating data to be transmitted into a plurality of modulated symbols, encoding each pair of modulated symbols from among said plurality of symbols in accordance with a transmission diversity scheme to result in a plurality of 2 by 2 matrices, with each 2 by 2 matrix corresponding to each pair of modulated symbols, orthogonally spreading the plurality of 2 by 2 matrices to generate an output matrix, and transmitting the symbols in the output matrix via a plurality of antennas by using either a space time transmission diversity scheme, a space frequency transmission diversity scheme, or a combination of a space time transmission diversity scheme and a space frequency transmission diversity scheme.Type: ApplicationFiled: August 29, 2007Publication date: November 13, 2008Inventors: Farooq Khan, Jianzhong Zhang, Jiann-an Tsai
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Patent number: 7450658Abstract: At the transmitter of a transmitter and receiver apparatus for Multiple Input/Multiple Output MultiCarrier-Code Division Multiple Access (MIMO MC-CDMA) systems, modified orthogonal transmit diversity (MOTD) encoders are used for increasing space and time transmission diversity. A P-way combiner is used to connect the MOTD encoders and P multi-carrier modulators. Each modulator is connected to a set of antennas. At the receiver, each multi-carrier demodulator has an amplitude/phase compensator to compensate distortion at every sub-carrier. Similarly, a combiner is used to connect the demodulators and the MOTD decoders. As a result, space, time, and frequency diversity can be explored.Type: GrantFiled: August 2, 2007Date of Patent: November 11, 2008Assignee: Industrial Technology Research InstituteInventors: Jiann-An Tsai, Shih-Kai Lee, Chang-Lung Hsiao
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Publication number: 20080273452Abstract: A method for transmission is provided to generate a plurality of reference signals for a plurality of antenna ports, with each reference signal corresponding to an antenna port; to map the plurality of reference signals to a plurality of physical antennas in accordance with a selected antenna port mapping scheme, with each reference signal corresponding to a physical antenna, and the plurality of physical antennas being aligned sequentially with equal spacing between two immediately adjacent physical antennas; to demultiplex information to be transmitted into a plurality of stream blocks; to insert a respective cyclic redundancy check to each of the stream blocks; to encode each of the stream blocks according to a corresponding coding scheme; to modulate each of the stream blocks according to a corresponding modulation scheme; to demultiplex the stream blocks to generate a plurality of sets of symbols, with each stream block being demultiplexed into a set of symbols; to map the plurality of sets of symbols inType: ApplicationFiled: January 11, 2008Publication date: November 6, 2008Inventors: Farooq Khan, Jiann-An Tsai, Jianzhong Zhang, Yinong Ding
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Publication number: 20080267310Abstract: A method for transmitting data via multiple antennas by modulating data to be transmitted into a plurality of modulated symbols, encoding each pair of modulated symbols from among said plurality of symbols in accordance with a transmission diversity scheme to result in a plurality of N by N matrices, with each N by N matrix corresponding to each pair of modulated symbols, generating a M by M code matrix comprised of the plurality of N by N matrices, orthogonally spreading the M by M code matrix to generate an output matrix, generating a plurality of row-permuted matrices by exchanging at least one pair of rows in the output matrix, and transmitting the symbols in the plurality of row-permuted matrices via a plurality of antennas by using either a space time transmission diversity scheme, a space frequency transmission diversity scheme, or a combination of a space time transmission diversity scheme and a space frequency transmission diversity scheme.Type: ApplicationFiled: December 27, 2007Publication date: October 30, 2008Inventors: Farooq Khan, Jianzhong Zhang, Jiann-An Tsai
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Patent number: 7400614Abstract: Downlink diversity in a CDMA 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.Type: GrantFiled: October 29, 2002Date of Patent: July 15, 2008Assignee: Lucent Technologies Inc.Inventors: R. Michael Buehrer, Robert Atmaram Soni, Jiann-An Tsai
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Publication number: 20080159537Abstract: The present disclosure relates generally to a system and method for scrambling in a wireless communication system. In one example, the method includes receiving a bit group representing at least a portion of a signal, where a total number of bits in the bit group is defined by a modulation scheme applied to the signal. A bit of the bit group is identified that indicates a sign of an imaginary part of the signal and another bit of the bit group is identified that indicates a sign of a real part of the signal. Only the two bits indicating the signs of the imaginary and real parts of the signal are scrambled using a random sequence prior to wirelessly transmitting the bit group.Type: ApplicationFiled: September 30, 2007Publication date: July 3, 2008Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Farooq Khan, Jiann-An Tsai
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Publication number: 20080151831Abstract: A multi-user, multiple input, multiple output network and process for transmitting data in a communication system encompassing multiple users, contemplates the steps of: a first user transmitting a first transmission frame to a base transceiver station while a second user simultaneously transmits a third transmission frame to the base station; the first and second users simultaneously transmit a second transmission frame and a fourth transmission frames respectively to the base station, with the second transmission frame being an orthogonally spread version of the first transmission frame, and the fourth transmission frame being an orthogonally spread version of the second transmission frame.Type: ApplicationFiled: June 1, 2007Publication date: June 26, 2008Inventors: Farooq Khan, Cornelius Van Rensburg, Zhouyue Pi, Jiann-An Tsai, Yinong Ding
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Publication number: 20080146166Abstract: A system, a receiver apparatus, a transmitter apparatus and a method for inter-user interference cancellation when simultaneous transmissions from two wireless users to the same base station are repeated using the same time-frequency resource. The percentage of interference cancellation is pre-set and phase shifts of the first and repeated transmitted symbols for each mobile user are determined in accordance with this pre-set percentage. The receiver uses a pre-determined technique for estimating the received symbols in accordance with the pre-set percentage and phase shifts.Type: ApplicationFiled: July 31, 2007Publication date: June 19, 2008Inventors: Farooq Khan, Cornelius Van Rensburg, Zhouyue Pi, Jiann-An Tsai, Yinong Ding
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Publication number: 20080080637Abstract: A base station capable of performing precoding in a wireless communication system is provided. The base station includes a plurality of codebooks and a codebook selector. Each codebook comprises a plurality of composite precoding matrices that are generated based on a corresponding diversity precoding matrix. The codebook selector is operable to select one of the codebooks for use in a communication session with a subscriber station.Type: ApplicationFiled: July 3, 2007Publication date: April 3, 2008Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Farooq Khan, Jiann-An Tsai, Cornelius van Rensburg, Yinong Ding
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Publication number: 20080039030Abstract: A base station for use in a wireless network communicating with a plurality of subscriber stations. The base station transmits in a downlink channel to a first subscriber station using a plurality of transmit antennas. The base station transmits to the first subscriber station using either a transmit diversity scheme or a beamforming scheme according to the amount of correlation between the transmit antennas observed at the first subscriber station. The base station also transmits to the first subscriber station using a cyclic delay diversity scheme having either zero delay or non-zero delay according to the amount of antenna/channel correlation observed at the first subscriber station.Type: ApplicationFiled: July 17, 2007Publication date: February 14, 2008Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Farooq Khan, Cornelius Van Rensburg, Jiann-An Tsai
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Publication number: 20080037682Abstract: The invention relates to an apparatus of transmitter and receiver for MIMO MC-CDMA systems. At the transmitter, modified orthogonal transmit diversity (MOTD) encoders are used for increasing space and time transmission diversity. A P-way combiner is used to connect the MOTD encoders and P multi-carrier modulators. Each modulator is connected to a set of antennas. At the receiver, each multi-carrier demodulator has an amplitude/phase compensator to compensate distortion at every sub-carrier. Similarly, a combiner is used to connect the demodulators and the MOTD decoders. Upon the invention, the space, time, and frequency diversity can be explored.Type: ApplicationFiled: August 2, 2007Publication date: February 14, 2008Applicant: Industrial Technology Research InstituteInventors: Jiann-An Tsai, Shih-Kai Lee, Chang-Lung Hsiao
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Publication number: 20080037679Abstract: A base station that communicates with subscriber stations in an OFDM wireless network. The base station transmits a first data stream and a second data stream to a subscriber station using a first virtual antenna and a second virtual antenna. The base station allocates first data symbols associated with the first data stream to be transmitted from the first virtual antenna in a first selected group of subbands of OFDM subcarriers and allocates second data symbols associated with the first data stream to be transmitted from the second virtual antenna in a second selected group of subbands of OFDM subcarriers.Type: ApplicationFiled: July 10, 2007Publication date: February 14, 2008Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Farooq Khan, Cornelius Rensburg, Jiann-An Tsai
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Patent number: 7330513Abstract: The invention relates to an apparatus of transmitter and receiver for Multiple Input/Multiple Output MultiCarrier-Code Division Multiple Access (MIMO MC-CDMA) systems. At the transmitter, modified orthogonal transmit diversity (MOTD) encoders are used for increasing space and time transmission diversity. A P-way combiner is used to connect the MOTD encoders and P multi-carrier modulators. Each modulator is connected to a set of antennas. At the receiver, each multi-carrier demodulator has an amplitude/phase compensator to compensate distortion at every sub-carrier. Similarly, a combiner is used to connect the demodulators and the MOTD decoders. Upon the invention, the space, time, and frequency diversity can be explored.Type: GrantFiled: June 17, 2004Date of Patent: February 12, 2008Assignee: Industrial Technology Research InstituteInventors: Jiann-An Tsai, Shih-Kai Lee, Chang-Lung Hsiao
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Publication number: 20080032744Abstract: A base station that communicates with subscriber stations in an OFDM wireless network. The base station transmits broadcast data and unicast data to the subscriber stations from a plurality of antennas using multiple-input, multiple-output (MIMO) techniques. The base station transmits a first broadcast pilot signal from a first antenna orthogonally to at least one of: i) a first unicast pilot signal transmitted from the first antenna; ii) a second unicast pilot signal transmitted from a second antenna; iii) a second broadcast pilot signal transmitted from the second antenna; and iv) superimposed broadcast data traffic and unicast data traffic transmitted from the first and second antennas. The base station uses orthogonal subcarriers or orthogonal time slots.Type: ApplicationFiled: June 13, 2007Publication date: February 7, 2008Applicant: SAMSUNG ELECTRONICS Co., LTD.Inventors: Farooq Khan, Jiann-An Tsai
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Publication number: 20070291871Abstract: The present disclosure relates generally to a system and method for broadcast pre-coding in a multiple input multiple output (MIMO) system. In one example, the method includes modulating a broadcast signal to create a stream of modulated symbols. Pre-coding is performed on each of the modulated symbols to break each modulated symbol into at least two pre-coded portions, and the two pre-coded portions of each modulated symbol are transmitted via at least two antennas.Type: ApplicationFiled: April 23, 2007Publication date: December 20, 2007Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Farooq Khan, Jiann-An Tsai, Cornelius Van Rensberg
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Publication number: 20070291867Abstract: The present disclosure relates generally to a system and method for superposition coding and interference cancellation in a multiple input multiple output (MIMO) system. In one example, the method includes demultiplexing a signal of a user into at least first and second signal portions and demultiplexing a signal of another user into at least third and fourth signal portions. Superposition coding is performed on the first and third signal portions to form a first composite signal and performed on the second and fourth signal portions to form a second composite signal. The first composite signal is transmitted via at least one antenna of a MIMO system and the second composite signal is transmitted via at least another antenna of the MIMO system.Type: ApplicationFiled: April 23, 2007Publication date: December 20, 2007Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Farooq Khan, Jiann-An Tsai, Cornelius Van Rensberg
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Publication number: 20070253370Abstract: A base station for use in wireless network that communicates with subscriber stations according to a multicarrier protocol. The base station receives an uplink subframe comprising a plurality of blocks. Each of the blocks comprises up to N subcarriers transmitted by the subscriber stations. The base station receives a first acknowledgment signal transmitted by a first subscriber station in the uplink subframe. The first acknowledgment signal is carried on at least one selected subcarrier in a first block of the uplink subframe and on at least one selected subcarrier in a second block of the uplink subframe.Type: ApplicationFiled: December 27, 2006Publication date: November 1, 2007Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Farooq Khan, Jiann-An Tsai