Patents by Inventor Sangsung Choi
Sangsung Choi 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: 20130043920Abstract: A digital phase-locked loop apparatus using FSK includes a PFD detecting phase differences between a reference clock and a frequency-divided signal, and a first adder for generating first digital control codes by adding first digital codes, second digital codes, and channel frequency codes including channel information to each other, the first digital codes being converted from time differences between first and second pulses. The apparatus further includes a digital filter correcting errors of the first digital control codes to generate second digital control codes, a DCO for varying an oscillating frequency in accordance with a digital tuning word based on the second digital control codes, and a dual modulus division unit dividing the oscillating frequency into a frequency-divided signal.Type: ApplicationFiled: August 20, 2012Publication date: February 21, 2013Applicants: Konkuk University Industrial Cooperation Corp., Electronics and Telecommunications Research InstituteInventors: Seung Sik LEE, Sangsung CHOI, Young Ae JEON, Sangjae LEE, Byoung Hak KIM, Mi Kyung OH, Cheol-ho SHIN, Kang-yoon LEE, YoungGun PU, Joon-Sung PARK
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Publication number: 20120287822Abstract: In the environment of a wireless personal area network (WPAN) with a plurality of piconets, to allow a tree-based routing service and an optimized routing service through repeatedly building parent-child piconets, an inter-piconet mesh communication device and method for providing a multi-hop communication function among a plurality of piconets is provided by defining a mesh sublayer between a frame convergence sublayer and a MAC sublayer and providing a mesh data service to the frame convergence sublayer through a mesh service access point, defining a mesh sublayer management entity between a device management entity and a MAC sublayer management entity and providing a mesh management service to a device management entity through a mesh sublayer management entity service access point.Type: ApplicationFiled: July 27, 2012Publication date: November 15, 2012Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Young Ae JEON, Seong-hee LEE, Sangsung CHOI, Kwang Roh PARK
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Patent number: 8300676Abstract: A communication apparatus generates a digital detection signal including a plurality of time symbols by digital-converting a detection signal corresponding to a received signal, estimates an average power value of the detection signal by calculating average power of the digital detection signal based on the digital detection signal, and performs UWB communication through a predetermined first channel when a predetermined reference power value is greater than the average power value.Type: GrantFiled: August 6, 2009Date of Patent: October 30, 2012Assignee: Electronics and Telecommunications Research InstituteInventors: Cheol-Ho Shin, Byoung Hak Kim, Jong Won Kim, Sangsung Choi, Kwang Roh Park
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Patent number: 8243624Abstract: Provided are a routing table generating method, a data transmission method, and a routing route formation method for multi-hop communication in high rate wireless personal networks. In a high rate WPAN environment including a plurality of piconets, a piconet controller (PNC), which performs a topology server function to provide the optimal route, collects link state information from the PNCs or DEVs (devices) belonging to a sub-tree that serves as a root and applies a minimum cost algorithm based on the collected link state information to calculate the optimal route for all pairs of originations and destinations existing within the sub-tree in consideration of QoS. The optimal route information is transmitted to the origination PNC via the destination PNC/DEV. During performing this, the optimal route between the pairs of originations and destinations is set.Type: GrantFiled: August 17, 2009Date of Patent: August 14, 2012Assignee: Electronics and Telecommunications Research InstituteInventors: Young Ae Jeon, Seong-hee Lee, Sangsung Choi, Kwang Roh Park, Sung-Woo Park
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Publication number: 20120163263Abstract: A base station and a terminal for supporting a low power mode are provided. The base station transmits a first type of beacon signal for a terminal operating in a normal mode, a second type of beacon signal for a terminal operating in a low power mode, and a charging signal for a terminal in a low power mode. The terminal harvests energy from a charging signal and receives the second type of beacon signal using the harvested energy. The terminal confirms a communication request through the second type of beacon signal, enters into an active period, and communicates with the base station.Type: ApplicationFiled: December 22, 2011Publication date: June 28, 2012Applicant: Electronics and Telecommunications Research InstituteInventors: Mi Kyung OH, Young Ae JEON, cheol-ho SHIN, Seung Sik LEE, Sangjae LEE, Byoung Hak KIM, Sangsung CHOI
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Publication number: 20120163416Abstract: A pulse generator of an ultra wideband (UWB) system includes: a plurality of delay cells for receiving pulses, delaying the received pulses for a predetermined time, and outputting the delayed pulses; and an edge combiner connected to output ends of the plurality of delay cells for receiving the delayed pulses from the plurality of delay cells, outputting fine pulses corresponding to the delayed time, and generating one impulse signal with the outputted fine pulses. The edge combiner includes a plurality of XOR gates for receiving a first delayed pulse and a second delayed pulse from an nth delay cell and an (n+1)th delay cell among the plurality of delay cells and generating fine pulses, respectively, and an OR gate for receiving a first fine pulse and a second fine pulse respectively output from a first XOR gate and a second XOR gate included in the plurality of XOR gates.Type: ApplicationFiled: December 14, 2011Publication date: June 28, 2012Applicants: UNIST Academy-Industry Research Corporation, Electronics and Telecommunications Research InstituteInventors: Jin Doo JEONG, Hyung Soo Lee, Sangsung Choi, Franklin Bien, Yun ho Choi, Young su Kim
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Publication number: 20120163359Abstract: A human body communication system is disclosed, which includes a plurality of intra-body communication apparatuses, a plurality of extra-body communication apparatuses, a bridge apparatus, and an access point. The bridge apparatus manages connections between the intra-body communication apparatuses and the extra-body communication apparatuses, and performs packet exchange. The access point performs packet exchange between a plurality of bridge apparatuses. The bridge apparatus performs negotiation with communication apparatuses to set up a connection, and manages a path based on the connection setup.Type: ApplicationFiled: December 22, 2011Publication date: June 28, 2012Applicant: Electronics and Telecommunications Research InstituteInventors: Cheolhyo LEE, Hong Soon NAM, Hyung Soo LEE, Sangsung CHOI
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Publication number: 20120163444Abstract: A transmitting apparatus groups a data bit sequence to groups each formed of a predetermined number of bits, modulates predetermined bits of one of groups through a frequency shift keying (FSK) modulation method, non-continuously aligns the FSK modulation signals, and transmits the non-continuous FSK modulation signals.Type: ApplicationFiled: August 25, 2011Publication date: June 28, 2012Applicant: Electronics and Telecommunications Research InstituteInventors: Mi Kyung OH, Cheol-Ho SHIN, Byoung Hak KIM, Seung Sik LEE, Sangsung CHOI
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Publication number: 20120140629Abstract: A routing method from a source device to a destination device is provided in a device within an extended beacon group. The device receives a first route request beacon from the source device or via at least one first neighbor device from the source device in accordance with a table-driven type. The device transmits a second route request beacon to the destination device or via at least one second neighbor device to the destination device in accordance with an on-demand type.Type: ApplicationFiled: November 30, 2011Publication date: June 7, 2012Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Young Ae JEON, Sangjae Lee, Sangsung Choi
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Patent number: 8134948Abstract: A method for allocating distributed Medium Access Control (MAC) resources in a Wireless Personal Area Network (WPAN) includes calculating an acknowledgement overhead; calculating a Medium Access Slot (MAS) overhead depending on a payload length of a frame; calculating a transfer rate; calculating a number of frame bits to be transmitted; and calculating a first number of MASs. Thereby, the method optimized a final number of MASs required per superframe. Further, a distributed MAC resource allocation apparatus includes a MAC client for determining a resource allocation scheme and an amount of resources, and for sending a request to a MAC resource management unit; a MAC physical layer for providing a received power level or the like to the MAC resource management unit; and the MAC resource management unit for determining a payload length or the like and for allocating wireless resources to devices connected to the WPAN.Type: GrantFiled: July 30, 2008Date of Patent: March 13, 2012Assignee: Electronics and Telecommunications Research InstituteInventors: Young Ae Jeon, Sangjae Lee, Sangsung Choi, Kwang Roh Park
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Patent number: 8045448Abstract: Provided is an apparatus and method for detecting a packet of a zero-padded OFDM signal, which are capable of determining if a packet exists in a reception (RX) signal by comparing a cross-correlation value of an OFDM signal delayed by a predetermined sample time, e.g., a zero-padded sample time, with a power value of the RX signal, thereby increasing a packet detection probability and preventing a false alarm. The packet detecting apparatus includes: a cross-correlation calculator for calculating a cross-correlation value of a reception signal received from the outside and delaying the calculated cross-correlation value by a predetermined sample time; a power calculator for calculating a power value of the reception signal; and a packet detector for determining if a packet exists in the reception signal by comparing the delayed cross-correlation value with the calculated power value, and detecting the corresponding packet.Type: GrantFiled: August 12, 2008Date of Patent: October 25, 2011Assignee: Electronics and Telecommunications Research InstituteInventors: Kyu-Min Kang, Sang-In Cho, Sangsung Choi
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Patent number: 8013651Abstract: The present invention relates to a signal converting device and receiving device in a wireless communication system. The receiving device of the wireless communication system includes a differential signal converter for receiving a single ended radio frequency signal and converting it into a differential radio frequency signal, and a frequency down converter for down converting the differential radio frequency signal to down frequency signal.Type: GrantFiled: October 16, 2009Date of Patent: September 6, 2011Assignee: Electronics & Telecommunications Research InstituteInventors: Seung Sik Lee, Bong Hyuk Park, Seunghyun Jang, Sangsung Choi, Changwan Kim
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Patent number: 7953199Abstract: Provided is a synchronization error tracking device and method. The method and system estimates and corrects the synchronization error generated by time and frequency offsets during the data transmission interval and uses a module designed for initial synchronization or channel estimation without adding a new correlation operator. Further, a combining mark value and a synchronization position value acquired during the synchronization process are used.Type: GrantFiled: November 2, 2009Date of Patent: May 31, 2011Assignee: Electronics and Telecommunications Research InstituteInventors: Kyu-Min Kang, Sang In Cho, Sung Woo Choi, Sangsung Choi
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Publication number: 20100148849Abstract: The present invention relates to a signal converting device and receiving device in a wireless communication system. The receiving device of the wireless communication system includes a differential signal converter for receiving a single ended radio frequency signal and converting it into a differential radio frequency signal, and a frequency down converter for down converting the differential radio frequency signal to down frequency signal.Type: ApplicationFiled: October 16, 2009Publication date: June 17, 2010Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Seung Sik LEE, Bong Hyuk PARK, Seunghyun JANG, Sangsung CHOI, Changwan KIM
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Publication number: 20100142596Abstract: Provided is a synchronization error tracking device and method. The method and system estimates and corrects the synchronization error generated by time and frequency offsets during the data transmission interval and uses a module designed for initial synchronization or channel estimation without adding a new correlation operator. Further, a combining mark value and a synchronization position value acquired during the synchronization process are used.Type: ApplicationFiled: November 2, 2009Publication date: June 10, 2010Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Kyu-Min KANG, Sang In CHO, Sung Woo CHOI, Sangsung CHOI
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Publication number: 20100136910Abstract: Provided are a device searching method of a Bluetooth application and an apparatus using the same. The apparatus includes an application unit that generates a command for searching a Bluetooth device in a surrounding area of the device searching apparatus, a stack unit that performs a Bluetooth device initialization process and processes the command generated in the application unit, a first module unit that searches first Bluetooth devices in the surrounding area of the device searching apparatus, and a second module unit that searches second Bluetooth devices in the surrounding area of the device searching apparatus.Type: ApplicationFiled: December 1, 2009Publication date: June 3, 2010Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Seong-hee LEE, Il-Soon JANG, Sangsung CHOI, Seong Hee PARK
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Publication number: 20100124252Abstract: A communication apparatus generates a digital detection signal including a plurality of time symbols by digital-converting a detection signal corresponding to a received signal, estimates an average power value of the detection signal by calculating average power of the digital detection signal based on the digital detection signal, and performs UWB communication through a predetermined first channel when a predetermined reference power value is greater than the average power value.Type: ApplicationFiled: August 6, 2009Publication date: May 20, 2010Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Cheol-Ho Shin, Byoung Hak Kim, Jong Won Kim, Sangsung Choi, Kwang Roh Park
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Publication number: 20100094920Abstract: A Fourier transform device generates a first sequence according to an input sequence based on a stored lookup table, and generates an output sequence by performing a butterfly operation on the first sequence a plurality of times.Type: ApplicationFiled: August 5, 2009Publication date: April 15, 2010Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Sang In Cho, Kyu-Min Kang, Sangsung Choi
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Patent number: 7693924Abstract: A 2N-point and N-point FFT/IFFT dual mode processor is provided. The processor includes a butterfly operator, the first and second MUXs, and the first and second N-point FFT processors. The butterfly operator receives 2N data and butterfly-operates on the received 2N data when receiving a control signal ‘0’ from the controller. The first and second MUXs respectively receive results from the butterfly operator to output the results in an increment of N when receiving a control signal ‘0’ from the controller, and respectively outputs different N data when receiving a control signal ‘1’ from the controller. The first and second N-point FFT processors N-point FFT operate on the results from the first and second MUXs and respectively output the same under control of the controller. Since the N-point FFT operation can be simultaneously performed two times at a receiver, the performance of the receiver can be enhanced.Type: GrantFiled: November 2, 2005Date of Patent: April 6, 2010Assignee: Electronics and Telecommunications Research InstituteInventors: Sang In Cho, Sangsung Choi, Kwang Roh Park
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Publication number: 20100056091Abstract: The present invention relates to a leakage signal reducing device and method. The present invention uses a signal with varied phase and gain output by a local oscillator to eliminate a leakage signal leaked by a local oscillator to a frequency converter.Type: ApplicationFiled: August 17, 2009Publication date: March 4, 2010Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Seunghyun JANG, Bong Hyuk PARK, Seung Sik LEE, Sangsung CHOI