Jae-Hyok
Jae-Hyok Lee, Seoul KR
Patent application number | Description | Published |
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20100296594 | APPARATUS AND METHOD FOR INITIAL SYNCHRONIZATION IN WIRELESS COMMUNICATION SYSTEM BASED ON OFDM - An apparatus and a method for acquiring initial synchronization in a wireless communication system based on Orthogonal Frequency Division Multiplexing (OFDM) are provided. The apparatus includes a frame synchronizer for acquiring frame synchronization using a preamble signal, a first offset determiner for determining a first time offset and a first frequency offset based on the frame synchronization, a preamble identifier estimator for estimating a preamble identifier in a receive signal interpolated with the first time offset and the first frequency offset, and a second offset determiner for generating a first preamble signal and a first pilot signal corresponding to the preamble identifier, for derandomizing a preamble signal and a pilot signal, and for determining a second time offset and a second frequency offset. Thus, the initial synchronization acquisition time in a low Signal-to-Noise Ratio (SNR) environment can be reduced. | 11-25-2010 |
Jae-Hyok Lee, Yongin-Si KR
Patent application number | Description | Published |
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20090141673 | Apparatus and method for rate control in a broadband wireless communication system - An apparatus and method for rate control in a wireless communication system are provided. The apparatus includes a preprocessor, a rate controller, a determiner, and a transmitter. The preprocessor determines feedback information on a physical layer packet using a feedback message of MAC ARQ. The rate controller updates a CQI reported from a receiver using the determined feedback information. The determiner determines an MCS using the updated CQI. The transmitter transmits data using the determined MCS. | 06-04-2009 |
20100136996 | Apparatus and method for selecting frequency allocation of femto base station - A wireless communication network includes an apparatus and method for dynamically allocating frequencies of a femto Base Station (BS). An operation of the femto BS includes measuring received signal strength on system Frequency Allocations (FAs) of a plurality of macro BSs, determining maximum received signal strengths for the respective FAs, and determining an available FA set by using a result obtained from comparison between the maximum received signal strengths for the respective FAs with a first threshold. | 06-03-2010 |
20100182951 | Apparatus and method for rate control in broadband wireless communication system - A method for rate control in a wireless communication system includes feedback information indicating whether a packet is received, is received from a receiver. A channel state value measured by the receiver is received. It is determined whether the same feedback information is received from the receiver successively more than a predetermined frequency. A target error rate is controlled if the same feedback information is received successively more than the predetermined frequency. | 07-22-2010 |
20100202282 | Method and apparatus for ranging in Broadband wireless access communication system - An apparatus and operation method of a Mobile Station (MS) for ranging in a broadband wireless access communication system includes receiving information for ranging code hopping from a Base Station (BS). The MS determines a hopping offset value that is a start of a ranging codes group using the information for ranging code hopping. The MS also determines a ranging codes group using the hopping offset value, and randomly selects at least one or more ranging codes among the determined ranging codes group and transmitting the selected ranging codes to the BS. | 08-12-2010 |
Jae-Hyok Lee, Suwon-Si KR
Patent application number | Description | Published |
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20090213961 | METHOD AND APPARATUS FOR CONTROLLING TRANSMISSION POWER IN A COMMUNICATION SYSTEM - In a communication system, a mobile terminal compares a first modulation/Forward Error Correction (FEC) rate level, which is a modulation/FEC rate level used in a previously transmitted signal, with a second modulation/FEC rate level, which is a modulation/FEC rate level to be used in a currently transmitted signal. If the second modulation/FEC rate level is higher than the first modulation/FEC rate level, the mobile terminal determines the transmission power using a normalized Carrier to Noise ratio (C/N) corresponding to the second modulation/FEC rate level on an ascending normalized C/N table, while if the second modulation/FEC rate level is lower than the first modulation/FEC rate level, the mobile terminal determines the transmission power using a normalized C/N corresponding to the second modulation/FEC rate level on a descending normalized C/N table. | 08-27-2009 |
20120236961 | APPARATUS AND METHOD FOR CYCLIC DELAY DIVERSITY IN MULTIPLE-ANTENNA WIRELESS COMMUNICATION SYSTEM - A cyclic delay diversity (CDD) technique in a multiple-antenna broadband wireless communication system is provided. An apparatus in the multiple-antenna broadband wireless communication system includes: a controller for selecting at least one sub-carrier to which CDD is applied; at least one shifter for shifting a phase of a signal mapped to the at least one selected sub-carrier; and an operator for converting the signal, which is mapped to the at least one selected sub-carrier and whose phase is shifted, and other signals mapped to the remaining sub-carriers into time-domain signals. | 09-20-2012 |