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: 9270420Abstract: A Two-Dimensional (2D) code receiver and transmitter, and methods for their operation in a 2D code communication system, are provided. The method for operating the 2D code receiver includes receiving a sequence of 2D codes from a 2D code transmitter having data encoded therein, wherein the 2D codes of the sequence are received in succession, and decoding the received a sequence of 2D codes into the data.Type: GrantFiled: September 16, 2009Date of Patent: February 23, 2016Assignee: Samsung Electronics Co., Ltd.Inventors: Farooq Khan, Jiann-An Tsai, Sridhar Rajagopal, Bill Semper, Zhouyue Pi, Ying Li
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Patent number: 8929485Abstract: 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: GrantFiled: April 23, 2007Date of Patent: January 6, 2015Assignee: Samsung Electronics Co., Ltd.Inventors: Farooq Khan, Jiann-An Tsai, Cornelius Van Rensberg
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Patent number: 8879532Abstract: A method and base station apparatus for transmitting pilot data in a wireless communication system, and a method and mobile station apparatus for receiving pilot data in a wireless communication system are provided. The method for transmitting pilot data in a wireless communication system includes determining a pilot pattern in at least one resource block for each of one or more pilot streams, and transmitting the one or more pilot streams based on the determined respective pilot pattern in the at least one resource block, wherein the at least one resource block comprises a plurality of subcarriers and a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols.Type: GrantFiled: March 11, 2010Date of Patent: November 4, 2014Assignee: Samsung Electronics Co., Ltd.Inventors: Jiann-An Tsai, Zhouyue Pi, Kaushik Josiam, Farooq Khan, Sudhir Ramakrishna
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Patent number: 8634432Abstract: A base station for use in an OFDM network capable of communicating with a plurality of subscriber stations in a coverage area of the OFDM network. The base station transmits to a first subscriber station in a first subband of subcarriers from a first transmit antenna and transmits to the first subscriber station in a second subband of subcarriers from a second transmit antenna. The first and second subbands comprise different subcarriers. The base station also transmits to a second subscriber station in the first subband of subcarriers from the second transmit antenna and transmits to the second subscriber station in the second subband of subcarriers from the first transmit antenna.Type: GrantFiled: March 27, 2006Date of Patent: January 21, 2014Assignee: Samsung Electronics Co., Ltd.Inventors: Farooq Khan, Cornelius van Rensburg, Jiann-An Tsai
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Patent number: 8625693Abstract: Methods for a transmitter station and a receiver station to perform beamforming in a wireless communication system, and a transmitter station and a receiver station to perform the corresponding method, are provided. The method for the transmitter station to perform beamforming in the wireless communication system includes estimating and tracking a long-term averaged and normalized channel correlation matrix between the transmitter station and a receiver station, determining beamforming coefficients based on the tracked long-term averaged and normalized channel correlation matrix, and communicating with the receiver station using the determined beamforming coefficients, wherein the receiver station also estimates and tracks the long term averaged and normalized channel correlation matrix, and determines beamforming coefficients based on the tracked long-term averaged and normalized channel correlation matrix.Type: GrantFiled: October 26, 2010Date of Patent: January 7, 2014Assignee: Samsung Electronics Co., Ltd.Inventors: Jiann-An Tsai, Zhouyue Pi, Sudhir Ramakrishna
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Patent number: 8582535Abstract: A base station for use in wireless network that communicating with subscriber stations according to a multicarrier protocol. The base station receives uplink signals transmitted by the subscriber stations and measures the channel quality of each uplink acknowledgment signal channel. The base station transmits to a first subscriber station a control message that assigns the first subscriber station to transmit a first acknowledgment signal in a first selected uplink acknowledgment signal channel. The base station selects the first selected uplink acknowledgment signal channel based on a first measured channel quality associated with the first selected uplink acknowledgment signal channel.Type: GrantFiled: February 20, 2007Date of Patent: November 12, 2013Assignee: Samsung Electronics Co. Ltd.Inventors: Farooq Khan, Jiann-An Tsai
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Patent number: 8537760Abstract: A method of dynamic hybrid multiple access in a wireless network that comprises a plurality of subscriber stations is provided. The method includes selecting a sub-carrier status for each of the subscriber stations based on at least one predetermined condition for the subscriber station. The sub-carrier status is either hopping or scheduled. The predetermined condition is monitored for each subscriber station to determine whether to switch the sub-carrier status for the subscriber station based on a change in the predetermined condition.Type: GrantFiled: November 4, 2005Date of Patent: September 17, 2013Assignee: Samsung Electronics Co., LtdInventors: Lai King Tee, Cornelius van Rensburg, Jiann-An Tsai
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Patent number: 8503560Abstract: 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: GrantFiled: July 3, 2007Date of Patent: August 6, 2013Assignee: Samsung Electronics Co., LtdInventors: Farooq Khan, Jiann-An Tsai, Cornelius van Rensburg, Yinong Ding
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Patent number: 8428177Abstract: A wireless communications network is provided. The wireless communications network comprises a plurality of base stations. Each one of said base stations is capable of wireless communications with a plurality of subscriber stations. At least one of said plurality of base stations comprises a processor configured to select a codeword from a codebook and precode data with the selected codeword, and a transmitter configured to transmit the precoded data. Rank 1 of the codebook is selected from the following algorithm: Codebook Matrix Index (CMI) Base Matrix Rank 1 1 V8(:, :, 3) V8(:, 1, 3) 2 V8(:, 2, 3) 3 V8(:, 3, 3) 4 V8(:, 4, 3) 5 V8(:, 5, 3) 6 V8(:, 6, 3) 7 V8(:, 7, 3) 8 V8(:, 8, 3) 9 V8(:, 9, 3) 10 V8(:, 10, 3) 11 V8(:, 11, 3) 12 V8(:, 12, 3) 13 V8(:, 13, 3) 14 V8(:, 14, 3) 15 V8(:, 15, 3) 16 V8(:, 16, 3).Type: GrantFiled: October 13, 2009Date of Patent: April 23, 2013Assignee: Samsung Electronics Co., Ltd.Inventors: Jiann-An Tsai, Zhouyue Pi
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Patent number: 8374257Abstract: 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: GrantFiled: April 23, 2007Date of Patent: February 12, 2013Assignee: Samsung Electronics Co., Ltd.Inventors: Farooq Khan, Jiann-An Tsai, Cornelius Van Rensberg
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Patent number: 8335159Abstract: A method of introducing frequency selectivity into transmissions in an orthogonal frequency division multiplexing network is provided. The method includes generating a symbol. A plurality of delayed symbols are generated based on the symbol. The delayed symbols are transmitted from multiple transmit antennas. The symbol delay values may be different for different users depending upon the users' channel characteristics.Type: GrantFiled: January 6, 2006Date of Patent: December 18, 2012Assignee: Samsung Electronics Co., Ltd.Inventors: Farooq Khan, Jiann-An Tsai
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Patent number: 8274937Abstract: Systems and methods are disclosed for use in a wireless network that promotes simultaneous beamforming. These systems and methods include determining the Channel Quality Indicator (CQI) and Best Beam Index (BBI) for communications between a plurality of mobile stations and a base station, ranking the plurality of mobile stations in a list according to the determined CQI and BBI, and selecting a subset of the plurality of mobile stations for simultaneous beamformed communications. These systems and methods may also include verifying that the selected subset of the plurality of mobile stations does not have a conflict and initiating beamformed communications. Certain embodiments of the BBI may be determined based on a predetermined codebook, which is a function of an antenna configuration, such as a uniform linear array (ULA) and a uniform circular array (UCA).Type: GrantFiled: June 5, 2009Date of Patent: September 25, 2012Assignee: Samsung Electronics Co., Ltd.Inventor: Jiann-An Tsai
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Patent number: 8265190Abstract: 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: GrantFiled: March 30, 2012Date of Patent: September 11, 2012Assignee: Samsung Electronics Co., Ltd.Inventors: Farooq Khan, Jianzhong Zhang, Jiann-An Tsai
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Patent number: 8265189Abstract: 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: GrantFiled: March 30, 2012Date of Patent: September 11, 2012Assignee: Samsung Electronics Co., Ltd.Inventors: Farooq Khan, Jianzhong Zhang, Jiann-An Tsai
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Patent number: 8254487Abstract: 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: GrantFiled: April 25, 2008Date of Patent: August 28, 2012Assignee: Samsung Electronics Co., Ltd.Inventors: Jiann-An Tsai, Cornelius Van Rensburg, Jianzhong Zhang
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Patent number: 8254492Abstract: 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: GrantFiled: December 27, 2007Date of Patent: August 28, 2012Assignee: Samsung Electronics Co., Ltd.Inventors: Farooq Khan, Jianzhong Zhang, Jiann-An Tsai
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Patent number: 8243693Abstract: 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: GrantFiled: June 13, 2007Date of Patent: August 14, 2012Assignee: Samsung Electronics Co., Ltd.Inventors: Farooq Khan, Jiann-An Tsai
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Patent number: 8243774Abstract: 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: GrantFiled: September 30, 2007Date of Patent: August 14, 2012Assignee: Samsung Electronics Co., Ltd.Inventors: Farooq Khan, Jiann-An Tsai
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Publication number: 20120189080Abstract: 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: March 30, 2012Publication date: July 26, 2012Inventors: Farooq Khan, Jianzhong Zhang, Jiann-an Tsai
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Publication number: 20120189076Abstract: 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: March 30, 2012Publication date: July 26, 2012Inventors: Farooq Khan, Jianzhong Zhang, Jiann-An Tsai