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1.发明授权Apparatus and method of detecting timing synchronization for fast fourier transform 有权装置和方法，用于检测所述快速傅立叶变换的定时同步
公开(公告)号：EP2092707B1
公开(公告)日：2014-01-01
申请号：EP07793205.1
申请日：2007-07-11
发明人： KANG, Yeonsu , KANG, Kunseok , AHN, Do-Seob , LEE, Ho-Jin
IPC分类号： H04L27/26
CPC分类号： H04L27/2662 , H04L27/2675
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2.发明公开RANDOM ACCESS CHANNEL ACCESS APPARATUS FOR MOBILE SATELLITE COMMUNICATION SYSTEM AND METHOD THEREFOR 有权直接接入信道接入设备一个移动卫星通信系统及其方法
公开(公告)号：EP1327316A1
公开(公告)日：2003-07-16
申请号：EP01976923.1
申请日：2001-10-17
发明人： LIM, Kwang-Jae , KIM, Soo-Young , LEE, Ho-Jin , YOU, Moon-Hee
IPC分类号： H04B7/26
CPC分类号： H04W74/006 , H04B7/18558 , H04W74/0833 , H04W84/06
摘要： The present invention relates to Random Access Channel (RACH) access apparatus for mobile satellite communication system and method therefor. The method for accessing random access channel (RACH) on satellite system, random access channel (RACH) carrying message data from a plurality of mobile stations to the satellite system, the method includes the steps of: receiving preamble and the message data, the message data successively transmitted with the preamble from the plurality of mobile stations; and transmitting acquisition response signal corresponding to the preamble or the message data to the plurality of mobile stations. Accordingly, success of packet reception of satellite system is improved and transmission delay is reduced.
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3.发明公开APPARATUS AND METHOD FOR RECEIVING ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING-BASED DIGITAL SIGNAL 审中-公开设备和方法，用于接收正交频分复用基于数字信号
公开(公告)号：EP2092708A1
公开(公告)日：2009-08-26
申请号：EP07833482.8
申请日：2007-10-22
发明人： KANG, Yeonsu , LEE, Ho-Jin , AHN, Do-Seob , KANG, Kunseok
IPC分类号： H04L27/26
CPC分类号： H04L25/0226 , H04L25/0212 , H04L25/022 , H04L25/0228 , H04L27/2613 , H04L27/2662 , H04L27/2665 , H04L27/2675 , H04L27/2695 , H04L2025/03522
摘要： A method and apparatus for receiving a digital signal that is modulated in an orthogonal frequency division multiplexing (OFDM) method are provided. The apparatus includes: a signal receiver receiving a digital signal which is modulated in an OFDM method that uses a preamble including a constant amplitude zero autocorrelation (CAZAC) sequence; a time synchronization estimator calculating a time when inter-symbol interference (ISI) is minimized by measuring a degree of cross-correlation between the received digital signal and the preamble and a power value of the received digital signal and estimating the time when the ISI is minimized to be a time synchronization point; a channel estimator estimating a channel compensation value through a first fast Fourier transform (FFT) using the time synchronization point and the degree of the cross-correlation; and a data recoverer recovering data by using the time synchronization point and the channel compensation value.
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4.发明公开APPARATUS AND METHOD OF DETECTING TIMING SYNCHRONIZATION FOR FAST FOURIER TRANSFORM 有权装置和方法，用于检测所述快速傅立叶变换的定时同步
公开(公告)号：EP2092707A1
公开(公告)日：2009-08-26
申请号：EP07793205.1
申请日：2007-07-11
发明人： KANG, Yeonsu , KANG, Kunseok , AHN, Do-Seob , LEE, Ho-Jin
IPC分类号： H04L27/26
CPC分类号： H04L27/2662 , H04L27/2675
摘要： Provided is an apparatus and method of detecting timing synchronization for a Fast Fourier Transform (FFT). The apparatus for detecting timing synchronization includes: a first sequence generator adapted to generate a plurality of first data sequences using a received signal; and a synchronization unit adapted to correlate the first data sequences with input second data sequences and determine a time point to perform an FFT on the received signal using the correlate results.
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5.发明公开METHOD FOR ESTIMATING FREQUENCY/TIME OFFSET AND APPARATUS USING THE SAME IN OFDM COMMUNICATION SYSTEM 审中-公开方法频率/时间推求的偏移并在某OFDM通信系统本设备
公开(公告)号：EP1825625A1
公开(公告)日：2007-08-29
申请号：EP05780670.5
申请日：2005-07-21
发明人： KIM, Hee-Wook , KANG, Kun-Seok , AHN, Do-Seob , LEE, Ho-Jin
IPC分类号： H04J11/00
CPC分类号： H04L27/2679 , H04L27/2602 , H04L27/2659 , H04L27/266 , H04L27/2662
摘要： Provided is a frequency and time offset estimation method and apparatus using the same for an orthogonal frequency division multiplexing (OFDM) communication system. The invention can establish frequency and time synchronization while improving data transmission rate in the OFDM communication system by estimating a time offset and a decimal of frequency offset using a first OFDM symbol and a Cyclic Prefix (CP) of an OFDM frame and compensating a received signal based thereon in a time domain, and estimating an integer of the frequency offset using the compensated signal and again compensating the compensated received signal based on the estimated integer of the frequency offset in a frequency domain.
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6.发明公开METHOD FOR GENERATING PREAMBLE SEQUENCE USING PN SEQUENCE, AND METHOD FOR TIME SYNCHRONIZATION AND FREQUENCY OFFSET ESTIMATION USING PN SEQUENCE 审中-公开用于生产前导序列的使用时间同步和频偏估计的PN序列和法，用PBN序列
公开(公告)号：EP1946469A1
公开(公告)日：2008-07-23
申请号：EP06798731.3
申请日：2006-09-11
发明人： KIM, Hee-Wook , KANG, Kun-Seok , AHN, Do-Seob , LEE, Ho-Jin
IPC分类号： H04J11/00
CPC分类号： H04L27/2662 , H04B1/7077 , H04J13/0022 , H04J13/10 , H04L27/2613 , H04L27/2657
摘要： A method for generating a preamble sequence using PN sequence in an OFDM communication system and a method for time synchronization and frequency offset estimation are provided. The method for generating a preamble sequence using a PN sequence at an OFDM transmission system includes the steps of: generating pseudo noise (PN) sequence having high autocorrelation value; and generating a preamble sequence by multiplying the PN sequence by an inverse matrix of an inverse fast Fourier transform (IFFT) matrix in frequency domain so as to make the PN sequence become the preamble sequence in time domain.
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公开(公告)号：EP1825611A1
公开(公告)日：2007-08-29
申请号：EP05821857.9
申请日：2005-12-13
发明人： KIM, Byoung-Gi , KANG, Kun-Seok , AHN, Do-Seob , LEE, Ho-Jin
IPC分类号： H04B7/26
CPC分类号： H04L25/0208 , H04B1/712 , H04B2201/70701 , H04L25/0228
摘要： Provided is a channel estimation method based on pilot diversity. The method includes the steps of extracting pilot symbols of a secondary common control physical channel (S-CCPCH) which is despreaded, calculating a mean value of the pilot symbols of the S-CCPCH, calculating a power ratio of the pilot symbols of the S-CCPCH, those of a dedicated physical control channel (DPCCH), and those of a common pilot channel (CPICH), and assigning weights to the pilot symbols of the S-CCPCH, those of the DPCH, and those of the CPICH.
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8.发明授权RANDOM ACCESS CHANNEL ACCESS APPARATUS FOR MOBILE SATELLITE COMMUNICATION SYSTEM AND METHOD THEREFOR 有权直接接入信道接入设备一个移动卫星通信系统及其方法
公开(公告)号：EP1327316B1
公开(公告)日：2013-12-18
申请号：EP01976923.1
申请日：2001-10-17
发明人： LIM, Kwang-Jae , KIM, Soo-Young , LEE, Ho-Jin , YOU, Moon-Hee
IPC分类号： H04B7/26
CPC分类号： H04W74/006 , H04B7/18558 , H04W74/0833 , H04W84/06
摘要： The present invention relates to Random Access Channel (RACH) access apparatus for mobile satellite communication system and method therefor. The method for accessing random access channel (RACH) on satellite system, random access channel (RACH) carrying message from a plurality of mobile stations to the satellite system, the method includes the steps of: receiving preamble and the message, the message successively transmitted with the preamble from the plurality of mobile stations; and transmitting acquisition response signal corresponding to the preamble or the message to the plurality of mobile stations. Accordingly, success of packet reception of satellite system is improved and transmission delay is reduced.
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9.发明公开SIGNAL TRANSMISSION METHOD OF CTC FOR SATELLITE MOBILE COMMUNICATION SYSTEM WHICH SIMULTANEOUSLY SUPPORTS BROADCAST SERVICE AND COMMUNICATION SERVICE AND THE CTC 审中-公开CTC信号传输方法卫星移动通信系统，同时广播服务和通信服务的支持者和反恐
公开(公告)号：EP2220790A1
公开(公告)日：2010-08-25
申请号：EP08741160.9
申请日：2008-04-04
发明人： KIM, Hee-Wook , KANG, Kun-Seok , AHN, Do-Seob , LEE, Ho-Jin
IPC分类号： H04B7/26
CPC分类号： H04B7/18523 , H04H20/02
摘要： Provided are a signal transmission method of a complementary terrestrial component (CTC) for a satellite mobile communication system that simultaneously supports a broadcast service and a communication service, and the CTC. The CTC simultaneously receives communication data that is data for an interactive communication service and broadcast data that is data for a broadcast service from a transmitter through different frequency bands, i.e., different carriers, or the same frequency bands, i.e., the same carriers, adds additional data, and transmits the broadcast data and the additional data to terminals through different frequency bands or the same frequency bands. In this way, the satellite mobile communication system including the CTC can effectively support the interactive communication service and the broadcast service at the same time.
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10.发明公开APPARATUS FOR ESTIMATING TIME AND FREQUENCY OFFSET USING ANTENNA DIVERSITY IN OFDM COMMUNICATION SYSTEM AND METHOD THEREOF 审中-公开DEVICE FOR THE估算时间和频率偏移使用天线多样性的一个OFDM通信系统及其方法
公开(公告)号：EP1958409A1
公开(公告)日：2008-08-20
申请号：EP06824083.7
申请日：2006-12-11
发明人： KIM, Hee-Wook , KANG, Kun-Seok , AHN, Do-Seob , LEE, Ho-Jin
IPC分类号： H04L27/26
CPC分类号： H04L27/2657 , H04B7/0842 , H04B7/0857 , H04B7/086 , H04L27/2662 , H04L27/2676
摘要： Provided are an apparatus for estimating a time offset and a frequency offset and a method thereof . The method includes the steps of : a) giving weights to the signals received through the antennas and generating an input signal; b) delaying the input signal by a predetermined index and adding a square value of the delayed signal and a square value of the input signal; c) summating a predetermined number of the output value of the step b) and multiplying the summed value and a predetermined value; d) adding the input signal and a conjugated delayed signal; e) summating a predetermined number of the output value of the step d); f ) detecting the maximum value of the time offset; and g) calculating a radian degree for the absolute value of the output value acquired in the step e) and calculating a frequency offset based on the detected time offset.
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