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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Publication number: 20090201887Abstract: The present invention is a receiver which includes a blind code detection device for determining the identity of a plurality of channels over which information is to be transmitted when the identity of all channels is not known by the receiver. The blind code detection device generates a candidate channel list filled with the identify of selected channels out of the plurality of channels. A multi-user detection device, responsive to the blind code detection device, processes those channels in the candidate code list.Type: ApplicationFiled: April 20, 2009Publication date: August 13, 2009Applicant: INTERDIGITAL TECHNOLOGY CORPORATIONInventors: John W. Haim, Hyun-Seok Oh, Younglok Kim, Ariela Ziera, Robert A. DiFazio
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Publication number: 20090168739Abstract: 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?Np1·Kmax, and 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: February 10, 2009Publication date: July 2, 2009Applicant: INTERDIGITAL TECHNOLOGY CORPORATIONInventors: Younglok Kim, Jung-Lin Pan, Ariela Zeira
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Patent number: 7522559Abstract: A receiver includes a blind code detection device for determining the identity of a plurality of channels over which information is to be transmitted when the identity of all channels is not known by the receiver. The blind code detection device generates a candidate channel list filled with the identity of selected channels out of the plurality of channels. A multi-user detection device, responsive to the blind code detection device, processes those channels in the candidate code list.Type: GrantFiled: March 25, 2003Date of Patent: April 21, 2009Assignee: InterDigital Technology CorporationInventors: John W. Haim, Hyun-Seok Oh, Younglok Kim, Ariela Zeira, Robert A. DiFazio
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Publication number: 20090046692Abstract: A method for the simultaneous reception of data from multiple sources having different spreading factors. A plurality of transmission response matrices are generated and grouped together for equal spreading factors. A plurality of spreading factor group matrices are assembled. A base matrix is formed based upon the spreading factor group matrix having a lowest spreading factor. An additional spreading factor group matrix is selected for consideration. Column placement reference index for the base matrix is derived. A reference location for the base matrix is derived. A column set from the selected spreading factor group matrix is derived. The column set is inserted into the base matrix. A total transmission response matrix is assembled.Type: ApplicationFiled: October 27, 2008Publication date: February 19, 2009Applicant: INTERDIGITAL TECHNOLOGY CORPORATIONInventors: Younglok Kim, Jung-Lin Pan, Ariela Zeira, Alexander Reznik
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Patent number: 7492750Abstract: 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: GrantFiled: July 29, 2004Date of Patent: February 17, 2009Assignee: InterDigital Technology CorporationInventors: Younglok Kim, Jung-Lin Pan, Ariela Zeira
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Patent number: 7489721Abstract: 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: March 3, 2004Date of Patent: February 10, 2009Assignee: Interdigital Technology CorporationInventor: Younglok Kim
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Publication number: 20080273469Abstract: 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 not acknowledge (NACK) as opposed to an acknowledge (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: June 4, 2008Publication date: November 6, 2008Applicant: INTERDIGITAL TECHNOLOGY CORPORATIONInventors: Stephen G. Dick, Younglok Kim, Nader Bolourchi, Sung-Hyuk Shin
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Patent number: 7443828Abstract: 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: February 23, 2004Date of Patent: October 28, 2008Assignee: InterDigital Technology CorporationInventors: Younglok Kim, Jung-Lin Pan, Ariela Zeira, Alexander Reznik
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Patent number: 7428425Abstract: 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: GrantFiled: February 19, 2003Date of Patent: September 23, 2008Assignee: InterDigital Technology CorporationInventors: Stephen G. Dick, Younglok Kim, Nader Bolourchi, Sung-Hyuk Shin
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Publication number: 20080095216Abstract: Data is estimated from a received vector comprising a plurality of communications. A received wireless signal is converted to a baseband signal, which is sampled to produce a received vector. Channel responses are estimated for the received communications. The noise variance is estimated. The noise variance is scaled by a scaling factor. Samples are processed using the estimated channel responses and the scaled noise variance to produce a spread data vector. The spread data vector is despread to recover the data of the received wireless signal.Type: ApplicationFiled: December 21, 2007Publication date: April 24, 2008Applicant: INTERDIGITAL TECHNOLOGY CORPORATIONInventors: Jung-Lin Pan, Younglok Kim, Donald Grieco
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Publication number: 20080095139Abstract: 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: December 21, 2007Publication date: April 24, 2008Applicant: INTERDIGITAL TECHNOLOGY CORPORATIONInventors: Younglok Kim, Jung-Lin Pan, Ariela Zeira, Alexander Reznik
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Patent number: 7313172Abstract: Data is estimated from a received vector comprising a plurality of communications. A received wireless signal is converted to a baseband signal, which is sampled to produce a received vector. Channel responses are estimated for the received communications. The noise variance is estimated. The noise variance is scaled by a scaling factor. Samples are processed using the estimated channel responses and the scaled noise variance to produce a spread data vector. The spread data vector is despread to recover the data of the received wireless signal.Type: GrantFiled: April 21, 2006Date of Patent: December 25, 2007Assignee: InterDigital Technology CorporationInventors: Jung-Lin Pan, Younglok Kim, Donald M. Grieco
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Patent number: 7313165Abstract: 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: April 28, 2004Date of Patent: December 25, 2007Assignee: InterDigital Technology CorporationInventors: Younglok Kim, Pan Jung-Lin, Ariela Zeira, Alexander Reznik
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Publication number: 20070291641Abstract: A plurality of communication bursts are transmitted substantially simultaneously in a time slot of a time division duplex/code division multiple access communication system. The communication system has a maximum number of K midamble shifts. Each burst has an assigned midamble. Each midamble is a shifted version of a basic midamble code having a period of P. A combined signal is received. The combined signal includes a received version of each of the communication burst's midambles. A P by P square circulant matrix is constructed including the K midamble shifts. A channel response is determined for each of the K midamble shifts using a prime factor algorithm (PFA) discrete Fourier transform (DFT) algorithm, the received combined signal and the P by P square circulant matrix. The PFA DFT algorithm has a plurality of stages. Each stage has P inputs.Type: ApplicationFiled: August 20, 2007Publication date: December 20, 2007Applicant: InterDigital Technology CorporationInventors: Jung Pan, Younglok Kim, Ariela Zeira
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Patent number: 7260056Abstract: A plurality of communication bursts are transmitted substantially simultaneously in a time slot of a time division duplex/code division multiple access communication system. The communication system has a maximum number of K midamble shifts. Each burst has an assigned midamble. Each midamble is a shifted version of a basic midamble code having a period of P. A combined signal is received. The combined signal includes a received version of each of the communication burst's midambles. A P by P square circulant matrix is constructed including the K midamble shifts. A channel response is determined for each of the K midamble shifts using a prime factor algorithm (PFA) discrete Fourier transform (DFT) algorithm, the received combined signal and the P by P square circulant matrix. The PFA DFT algorithm has a plurality of stages. Each stage has P inputs.Type: GrantFiled: December 3, 2002Date of Patent: August 21, 2007Assignee: InterDigital Technology CorporationInventors: Jung Lin Pan, Younglok Kim, Ariela Zeira
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Publication number: 20070171812Abstract: A code indexing system for a CDMA communication station that uses orthogonal variable spreading factor (OVSF) codes having 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: December 1, 2006Publication date: July 26, 2007Applicant: INTERDIGITAL TECHNOLOGY CORPORATIONInventors: Younglok Kim, Jung-Lin Pan
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Patent number: 7239604Abstract: 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 23, 2004Date of Patent: July 3, 2007Assignee: InterDigital Technology CorporationInventors: Younglok Kim, Jung-Lin Pan
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Patent number: 7177319Abstract: An insertion sorter circuit and method are provided which are particularly useful for sorting channel response values of a communication signal. The sorter circuit includes a series of sorter elements which each have a register. The circuit is configured to cascade values downwardly when one register receives a greater value than it has stored, which value is not greater than the value stored in any upstream register. At the end of processing the values, the most significant values are stored in the registers, the sum of which are the channel power estimate. The channel noise variance is obtainable by applying a system dependent scaling factor to the sum of the least significant values processed.Type: GrantFiled: December 27, 2001Date of Patent: February 13, 2007Assignee: InterDigital Technology CorporationInventors: Ryan Samuel Buchert, Chayil Timmerman, Younglok Kim
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Patent number: 7158802Abstract: 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: GrantFiled: February 19, 2003Date of Patent: January 2, 2007Assignee: InterDigital Technology CorporationInventors: Stephen G. Dick, Younglok Kim, Nader Bolourchi, Sung-Hyuk Shin
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Publication number: 20060188008Abstract: Data is estimated from a received vector comprising a plurality of communications. A received wireless signal is converted to a baseband signal, which is sampled to produce a received vector. Channel responses are estimated for the received communications. The noise variance is estimated. The noise variance is scaled by a scaling factor. Samples are processed using the estimated channel responses and the scaled noise variance to produce a spread data vector. The spread data vector is despread to recover the data of the received wireless signal.Type: ApplicationFiled: April 21, 2006Publication date: August 24, 2006Applicant: InterDigital Technology CorporationInventors: Jung-Lin Pan, Younglok Kim, Donald Grieco