Patents by Inventor Younglok Kim
Younglok Kim 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: 7095731Abstract: The present invention is a system and method for transmitting data symbols in a CDMA communication system including a transmitter having an antenna array and a receiver. The system generates a first and second data field of symbols, then encodes them to produce complex conjugates of the respective symbols. A first communication burst including the first and second data fields, which are separated by a midamble, over a first antenna, and a second communication burst produced using said complex conjugates of said first and second data fields, which are separated by a midamble, over a second antenna are then transmitted by the transmitter. The receiver then receives and decodes the first and second communication bursts to recover the first and second data fields.Type: GrantFiled: December 3, 2001Date of Patent: August 22, 2006Assignee: InterDigital Technology CorporationInventors: Younglok Kim, Ariela Zeira
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Patent number: 7042929Abstract: Data from a plurality of communications is transmitted in a code division multiple access communication system. The transmitted communications are received at a receiver and converted into a baseband signal. The baseband signal is sampled to produce a received vector. An estimating device estimates channel responses as a channel response matrix and estimates a noise variance of the received communications. The noise variance is then scaled using a scaling factor derived from at least one gain factor determined for at least one received communication. The received communications are then equalized using the channel response matrix and the scaled noise variance to produce a spread data vector. The spread data vector is despread in order to detect data transmitted as part of the received communications. In an alternate embodiment, the channel response matrix is scaled instead of the noise variance.Type: GrantFiled: July 6, 2005Date of Patent: May 9, 2006Assignee: InterDigital Technology CorporationInventors: Jung-Lin Pan, Younglok Kim, Donald M. Grieco
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Publication number: 20050243900Abstract: Data from a plurality of communications is transmitted in a code division multiple access communication system. The transmitted communications are received at a receiver and converted into a baseband signal. The baseband signal is sampled to produce a received vector. An estimating device estimates channel responses as a channel response matrix and estimates a noise variance of the received communications. The noise variance is then scaled using a scaling factor derived from at least one gain factor determined for at least one received communication. The received communications are then equalized using the channel response matrix and the scaled noise variance to produce a spread data vector. The spread data vector is despread in order to detect data transmitted as part of the received communications. In an alternate embodiment, the channel response matrix is scaled instead of the noise variance.Type: ApplicationFiled: July 6, 2005Publication date: November 3, 2005Applicant: InterDigital Technology CorporationInventors: Jung-Lin Pan, Younglok Kim, Donald Grieco
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Patent number: 6928104Abstract: Data from a plurality of communications is transmitted in a code division multiple access communication system. The transmitted communications are received. Gain factors are determined for at least one of the received communications. Data of the received communications is detected using a scaling factor derived from the determined gain values.Type: GrantFiled: December 20, 2002Date of Patent: August 9, 2005Assignee: InterDigital Technology CorporationInventors: Jung-Lin Pan, Younglok Kim, Donald Grieco
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Publication number: 20050002356Abstract: Method and apparatus employed by a UE for interference signal code power noise variance estimation employing a reduced number of samples utilizing the equation ? ^ n 2 = T · ? i = 1 N sample ? ? h n ? ( i ) ? 2 , where T = G · ? ? ( r ) N sample , where Nsample=Lchest?Npl·Kmax, where ? ? ( r ) = [ 1 + ( 1 r - 1 ) · ln ? ( 1 - r ) ] - 1 and where r = N sample L chest . As an alternative, a recursive technique may be employed wherein the noise variance is estimated from the ignored coefficients of the estimated channel output and upgraded recursively as per the following: ? ^ n 2 = 1 KW ? ? j = 1 K ? ? i = 1 W ? ? h i ( j ) - h ^ i ( j ) ? 2 , where ?i(j) are the channel estimates after the post processing and the noise variance estimates {circumflex over (?)}n-12, and the initial values of ?i(j) are all zeros.Type: ApplicationFiled: July 29, 2004Publication date: January 6, 2005Applicant: InterDigital Technology CorporationInventors: Younglok Kim, Jung-Lin Pan, Ariela Zeira
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Patent number: 6816470Abstract: Method and apparatus for interference signal code power noise variance estimation employing a reduced number of samples utilizing the equation σ ^ n 2 = T · ∑ i = 1 N sample ⁢ &LeftBracketingBar; h n ⁢ ( i ) &RightBracketingBar; 2 , where T = G · γ ⁢ ( rType: GrantFiled: June 13, 2002Date of Patent: November 9, 2004Assignee: InterDigital Technology CorporationInventors: Younglok Kim, Jung-Lin Pan, Ariela Zeira
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Publication number: 20040202233Abstract: A plurality of communication signals is received. Each communication signal has an associated code. At least two of the communication signals has a different spreading factor. The associated codes have a scrambling code period. A total system response matrix has blocks. Each block has one dimension of a length M and another dimension of a length based on in part M and the spreading factor of each communication. M is based on the scrambling code period. Data of the received plurality of communication signals is received using the constructed system response matrix.Type: ApplicationFiled: April 28, 2004Publication date: October 14, 2004Applicant: InterDigital Technology CorporationInventors: Younglok Kim, Jung-Lin Pan, Ariela Zeira, Alexander Reznik
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Publication number: 20040196781Abstract: A code indexing system for a CDMA communication station that uses orthogonal variable spreading factor (OVSF) codes has a single number mapped to each code. The new code number itself not only provides the code signature, but it is also used for the OVSF code generation. In addition, the system provides easy and fast generation of the available code list without the help of look-up table. This capability improves the dynamic code assignment.Type: ApplicationFiled: April 23, 2004Publication date: October 7, 2004Applicant: InterDigital Technology CorporationInventors: Younglok Kim, Jung-Lin Pan
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Publication number: 20040170229Abstract: The present invention is a method and system for receiving data transmitted using block space time transmit diversity (BSTTD) in a code division multiple access (CDMA) communication system. The system comprises a transmitter, for transmitting a first data field using a first antenna and a second data field using a second antenna, and a receiver. The receiver includes an antenna for receiving the first and second transmitted data fields, and a BSTTD joint detector which determines symbols of the first and second transmitted data fields using a minimum mean square error block linear equalizer model and an approximated Cholesky decomposition of the model.Type: ApplicationFiled: March 3, 2004Publication date: September 2, 2004Applicant: InterDigital Technology CorporationInventor: Younglok Kim
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Publication number: 20040165567Abstract: A plurality of communication signals have differing spreading codes. Each communication has an associated code comprising chips. For each chip of each communication, a vector of that chip convolved with an impulse response is produced. For each communication, support blocks comprising the chip vectors are produced. A number of the chip vectors in a support block is based on that communication's spreading factor. A system response matrix is assembled. The system response matrix has symbol sub-matrices. Each symbol sub-matrix comprises a support block from each communication. Data of the communications is detected using the symbol response matrix.Type: ApplicationFiled: February 23, 2004Publication date: August 26, 2004Applicant: InterDigital Technology CorporationInventors: Younglok Kim, June-Lin Pan, Ariela Zeira, Alexander Reznik
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Publication number: 20040141480Abstract: Data is detected on a plurality of received communications channels in a CDMA wireless communication system. A solution for estimating data of the received communication signals is modeled using a linear system requiring a matrix inversion. Columns or rows of an approximate Cholesky factor are determined. A difference between the determined columns or rows is determined. If the determined difference is less than a threshold, subsequent columns or rows are determined by previously determined columns or rows. The data of the received communication signals is estimated using the approximate Cholesky factor, and the estimate is used to detect data received on the plurality of channels.Type: ApplicationFiled: February 5, 2004Publication date: July 22, 2004Applicant: InterDigital Technology CorporationInventors: Younglok Kim, Ariela Zeira
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Patent number: 6747947Abstract: A code indexing system for a CDMA communication station that uses orthogonal variable spreading factor (OVSF) codes has a single number mapped to each code. The new code number itself not only provides the code signature, but it is also used for the OVSF code generation. In addition, the system provides easy and fast generation of the available code list without the help of look-up table. This capability improves the dynamic code assignment.Type: GrantFiled: April 21, 2003Date of Patent: June 8, 2004Assignee: InterDigital Technology CorporationInventors: Younglok Kim, Jung-Lin Pan
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Patent number: 6741653Abstract: A plurality of communication signals is received. Each communication signal has an associated code. At least two of the communication signals has a different spreading factor. The associated codes have a scrambling code period. A total system response matrix has blocks. Each block has one dimension of a length M and another dimension of a length based on in part M and the spreading factor of each communication. M is based on the scrambling code period. Data of the received plurality of communication signals is received using the constructed system response matrix.Type: GrantFiled: July 1, 2002Date of Patent: May 25, 2004Assignee: InterDigital Technology CorporationInventors: Younglok Kim, Jung-Lin Pan, Ariela Zeira, Alexander Reznik
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Patent number: 6714527Abstract: A plurality of communication signals have differing spreading codes. Each communication has an associated code comprising chips. For each chip of each communication, a vector of that chip convolved with an impulse response is produced. For each communication, support blocks comprising the chip vectors are produced. A number of the chip vectors in a support block is based on that communication's spreading factor. A system response matrix is assembled. The system response matrix has symbol sub-matrices. Each symbol sub-matrix comprises a support block from each communication. Data of the communications is detected using the symbol response matrix.Type: GrantFiled: June 18, 2002Date of Patent: March 30, 2004Assignee: InterDigital Techology CorporationInventors: Younglok Kim, Jung-Lin Pan, Ariela Zeira, Alexander Reznik
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Patent number: 6707864Abstract: The present invention is a method and system for receiving data transmitted using block space time transmit diversity (BSTTD) in a code division multiple access (CDMA) communication system. The system comprises a transmitter, for transmitting a first data field using a first antenna and a second data field using a second antenna, and a receiver. The receiver includes an antenna for receiving the first and second transmitted data fields, and a BSTTD joint detector which determines symbols of the first and second transmitted data fields using a minimum mean square error block linear equalizer model and an approximated Cholesky decomposition of the model.Type: GrantFiled: December 27, 2001Date of Patent: March 16, 2004Assignee: InterDigital Technology CorporationInventor: Younglok Kim
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Patent number: 6690660Abstract: Data is to be detected in a wireless communication system. A plurality of communication signals are received. A solution for estimating data of the received communication signals is modeled using a linear system requiring a matrix inversion. Columns or rows of an approximate Cholesky factor are determined. A difference between the determined columns or rows is determined. If the determined difference is less than a threshold, subsequent columns or rows are determined by previously determined columns or rows. The data of the received communication signals is estimated using the approximate Cholesky factor.Type: GrantFiled: May 22, 2002Date of Patent: February 10, 2004Assignee: InterDigital Technology CorporationInventors: Younglok Kim, Ariela Zeira
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Publication number: 20040013171Abstract: Data from a plurality of communications is transmitted in a code division multiple access communication system. The transmitted communications are received. Gain factors are determined for at least one of the received communications. Data of the received communications is detected using a scaling factor derived from the determined gain values.Type: ApplicationFiled: December 20, 2002Publication date: January 22, 2004Applicant: InterDigital Technology CorporationInventors: Jung-Lin Pan, Younglok Kim, Donald Grieco
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Publication number: 20040009780Abstract: An ACK/NACK method and system for use in time division duplex (TDD) and frequency division duplex (FDD) systems. In high speed downlink packet access (HSDPA), based on the assignment of timeslots for the high speed shared information channel (HS-SICH), each user equipment (UE) can be assigned two (2) different channelization codes. It is then possible to adopt the signaling convention that one code represents acknowledge error-free (Ack) and the other code shall represent acknowledge error condition (Nack). The Node B is able to distinguish the presence of the transmitted channelization code as opposed to the channelization code which is not transmitted. The probability of error, using this invention is an order of a magnitude smaller than if the Ack/Nack were signaled using typical modulation techniques.Type: ApplicationFiled: February 19, 2003Publication date: January 15, 2004Applicant: InterDigital Technology CorporationInventors: Stephen G. Dick, Younglok Kim, Nader Bolourchi, Sung-Hyuk Shin
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Publication number: 20040005903Abstract: A criterion for biasing a binary decision requiring an unequal protection which utilizes a measured signal to interference ratio (SIR). The SIR may be derived from a determination of channel estimation. The SIR is compared against a threshold, the threshold being selected to bias the decision toward a NACK as opposed to an ACK determination. The technique is advantageous for providing biased binary decisions for high speed downlink packets (HSDP) but may be utilized for both uplink and downlink applications.Type: ApplicationFiled: February 19, 2003Publication date: January 8, 2004Applicant: InterDigital Technology CorporationInventors: Stephen G. Dick, Younglok Kim, Nader Bolourchi, Sung-Hyuk Shin
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Publication number: 20040001528Abstract: A plurality of communication signals is received. Each communication signal has an associated code. At least two of the communication signals has a different spreading factor. The associated codes have a scrambling code period. A total system response matrix has blocks. Each block has one dimension of a length M and another dimension of a length based on in part M and the spreading factor of each communication. M is based on the scrambling code period. Data of the received plurality of communication signals is received using the constructed system response matrix.Type: ApplicationFiled: July 1, 2002Publication date: January 1, 2004Applicant: InterDigital Technology CorporationInventors: Younglok Kim, Jung-Lin Pan, Ariela Zeira, Alexander Reznik