Patents by Inventor Seokheon Kang
Seokheon Kang 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: 8422604Abstract: Provided is a method for detecting frame sync and frame structure in a satellite broadcasting system, which acquires an estimated value for detecting frame structure and frame sync and overcomes distortion of correlation analysis values by summing differential correlation values for SOF positions in consideration of the variable frame length, and selecting a maximum value in a channel environment with low signal-to-noise ratio and high frequency error. SOF is a sync word indicating the start point of a frame. The method includes the steps of: acquiring SOF differential correlation value sequences; acquiring sums (di,t) of the correlation values normalized for SOF positions based on the number of symbols per frame by using the above-generated SOF differential correlation value sequences; and selecting a maximum value (dz,x) among the sums of correlation values, detecting z as a frame sync position, and detecting x as a frame structure index.Type: GrantFiled: October 30, 2007Date of Patent: April 16, 2013Assignees: Electronics and Telecommunications Research Institute, Industry-University Cooperation Foundation Sogang UniversityInventors: Pan-Soo Kim, Dae-Ig Chang, Deock-Gil Oh, Seokheon Kang, Deokchang Kang, Wonjin Sung
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Patent number: 8085818Abstract: Provided is a method for detecting frame sync and frame structure in a satellite broadcasting system. The method for detecting frame sync and frame structure includes the steps of: calculating differential correlation values of reception symbols; generating index sequences of reception symbols whose differential correlation values calculated above exceed a threshold value; calculating positions estimated as frame start points which correspond to a total frame number based on the number of symbols per frame for each frame structure; and detecting frame sync and frame structure based on the umber of positions where the above-calculated frame start point estimated positions and the above-generated index sequences are matched.Type: GrantFiled: October 31, 2007Date of Patent: December 27, 2011Assignees: Electronics and Telecommunications Research Institue, Industry-University Cooperation Foundation Sogang UnniversityInventors: Pan-Soo Kim, Dae-Ig Chang, Deock-Gil Oh, Sangtae Kim, Seokheon Kang, Wonjin Sung
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Publication number: 20100322366Abstract: Provided is a method for detecting frame sync and frame structure in a satellite broadcasting system, which acquires an estimated value for detecting frame structure and frame sync and overcomes distortion of correlation analysis values by summing differential correlation values for SOF positions in consideration of the variable frame length, and selecting a maximum value in a channel environment with low signal-to-noise ratio and high frequency error. SOF is a sync word indicating the start point of a frame. The method includes the steps of: acquiring SOF differential correlation value sequences; acquiring sums (di,t) of the correlation values normalized for SOF positions based on the number of symbols per frame by using the above-generated SOF differential correlation value sequences; and selecting a maximum value (dz,x) among the sums of correlation values, detecting z as a frame sync position, and detecting x as a frame structure index.Type: ApplicationFiled: October 30, 2007Publication date: December 23, 2010Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Pan-Soo Kim, Dae-lg Chang, Deock-Gil Oh, Seokheon Kang, Deokchang Kang, Wonjin Sung
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Publication number: 20100007743Abstract: Provided is a method for detecting frame sync and frame structure in a satellite broadcasting system. The method for detecting frame sync and frame structure includes the steps of: calculating differential correlation values of reception symbols; generating index sequences of reception symbols whose differential correlation values calculated above exceed a threshold value; calculating positions estimated as frame start points which correspond to a total frame number based on the number of symbols per frame for each frame structure; and detecting frame sync and frame structure based on the umber of positions where the above-calculated frame start point estimated positions and the above-generated index sequences are matched.Type: ApplicationFiled: October 31, 2007Publication date: January 14, 2010Applicant: Electronics and Telecommunication Research InstituteInventors: Pan-Soo Kim, Dae-Ig Chang, Deock-Gil Oh, Sangtae Kim, Seokheon Kang, Wonjin Sung
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Patent number: 7587653Abstract: Provided is a decoding method for detecting Physical Layer Signaling Codes (PLSCs) from frames of a satellite broadcasting system. The method includes: a) acquiring a summation vector and a subtraction vector from an inputted symbol vector; b) performing parallel Reed-Muller (32,6) decoding onto the summation and subtraction vectors based on a Hadamard matrix and estimating message bits of the summation and subtraction vectors; c) performing PLSC coding and modulation onto the message bits of the summation and subtraction vectors; d) calculating a first difference between symbols of the received symbol vector and the summation vector symbols, and a second difference between the symbols of the received symbol vector and the subtraction vector symbols; and e) when the first difference is smaller than the second difference, determining a Reed-Muller codeword is repeated, or when the first difference is larger than the second difference, determining that the Reed-Muller codeword is inverted.Type: GrantFiled: May 26, 2006Date of Patent: September 8, 2009Assignee: Electronics and Telecommunications Research InstituteInventors: Pan-Soo Kim, Dae-Ig Chang, In-Ki Lee, Tae-Hoon Kim, Deock-Gil Oh, Wonjin Sung, Seokheon Kang, Deokchang Kang
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Patent number: 7308064Abstract: Provided is a frame synchronization method for synchronizing frames with pilot blocks added thereto based on differential correlation information in a satellite communication system. The method can acquire a highly reliable frame synchronization estimation value by achieving a multi-step threshold value test using pilot blocks after a correlation analysis and a threshold test based on a sync signal in order to resolve the problem of a low signal-to-noise ratio and a large frequency error and acquire highly reliable frame synchronization performance, and can overcome distortion of a correlation analysis value caused by the frequency error by analyzing correlation based on differential information. The method includes the steps of: a) performing correlation analysis and a threshold test by using a sync word; and b) performing a multi-step correlation value test by using the pilot blocks added to the frames prior to the sync word.Type: GrantFiled: May 26, 2006Date of Patent: December 11, 2007Assignee: Electronics and Telecommunications Research InstituteInventors: Pan-Soo Kim, In-Ki Lee, Tae-Hoon Kim, Dae-Ig Chang, Deock-Gil Oh, Wonjin Sung, Deokchang Kang, Seokheon Kang
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Publication number: 20070150796Abstract: Provided is a decoding method for detecting Physical Layer Signaling Codes (PLSCs) from frames of a satellite broadcasting system. The method includes: a) acquiring a summation vector and a subtraction vector from an inputted symbol vector; b) performing parallel Reed-Muller (32,6) decoding onto the summation and subtraction vectors based on a Hadamard matrix and estimating message bits of the summation and subtraction vectors; c) performing PLSC coding and modulation onto the message bits of the summation and subtraction vectors; d) calculating a first difference between symbols of the received symbol vector and the summation vector symbols, and a second difference between the symbols of the received symbol vector and the subtraction vector symbols; and e) when the first difference is smaller than the second difference, determining a Reed-Muller codeword is repeated, or when the first difference is larger than the second difference, determining that the Reed-Muller codeword is inverted.Type: ApplicationFiled: May 26, 2006Publication date: June 28, 2007Inventors: Pan-Soo Kim, Dae-Ig Chang, In-Ki Lee, Tae-Hoon Kim, Deock-Gil Oh, Wonjin Sung, Seokheon Kang, Deokchang Kang
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Publication number: 20070133727Abstract: Provided is a frame synchronization method for synchronizing frames with pilot blocks added thereto based on differential correlation information in a satellite communication system. The method can acquire a highly reliable frame synchronization estimation value by achieving a multi-step threshold value test using pilot blocks after a correlation analysis and a threshold test based on a sync signal in order to resolve the problem of a low signal-to-noise ratio and a large frequency error and acquire highly reliable frame synchronization performance, and can overcome distortion of a correlation analysis value caused by the frequency error by analyzing correlation based on differential information. The method includes the steps of: a) performing correlation analysis and a threshold test by using a sync word; and b) performing a multi-step correlation value test by using the pilot blocks added to the frames prior to the sync word.Type: ApplicationFiled: May 26, 2006Publication date: June 14, 2007Inventors: Pan-Soo Kim, In-Ki Lee, Tae-Hoon Kim, Dae-Ig Chang, Deock-Gil Oh, Wonjin Sung, Deokchang Kang, Seokheon Kang