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1.发明公开SYSTEM AND METHOD FOR COMPENSATING TIMING ERROR USING PILOT SYMBOL IN OFDM/CDMA COMMUNICATION SYSTEM 有权系统和方法补偿时错误通过使用导频符号来作为OFDM / CDMA通信系统
公开(公告)号：EP1133841A1
公开(公告)日：2001-09-19
申请号：EP00966559.7
申请日：2000-09-29
发明人： KIM, Hye-Jeong , LEE, Hyun-Kyu
IPC分类号： H04B7/208
CPC分类号： H04L27/2662 , H04L5/0016 , H04L5/0048 , H04L27/2656 , H04L27/2657 , H04L27/2675
摘要： A timing error compensation system in an OFMD/CDMA communication system includes an analog-to-digital converter for converting an OFDM signal, comprised of a data symbol stream in which a pilot symbol is inserted at intervals of a prescribed number of data symbols, received from a transmitter, to a digital OFDM symbol stream by prescribed sampling synchronization, a guard interval remover for removing a guard interval inserted in the OFDM symbol by prescribed frame synchronization, and a fast Fourier transform (FFT) device for performing fast Fourier transform on the guard interval-removed OFDM symbol and outputting a data symbol stream. In the time error compensation system, a pilot symbol detector receives the data symbol stream and detects the pilot symbols inserted in the data symbol stream at prescribed intervals. A timing compensator determines a linear phase difference line for the detected pilot symbol, generates a timing error estimation signal according to the determined linear phase difference line, and provides the timing error estimation signal to the analog-to-digital converter and the guard interval remover so as to determine the sampling synchronization and the frame synchronization.
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2.发明授权SYSTEM AND METHOD FOR COMPENSATING TIMING ERRORS USING PILOT SYMBOLS IN A OFDM/CDMA COMMUNICATION SYSTEM 有权系统和方法补偿时错误通过使用导频符号来作为OFDM / CDMA通信系统
公开(公告)号：EP1133841B1
公开(公告)日：2008-05-14
申请号：EP00966559.7
申请日：2000-09-29
发明人： KIM, Hye-Jeong , LEE, Hyun-Kyu
CPC分类号： H04L27/2662 , H04L5/0016 , H04L5/0048 , H04L27/2656 , H04L27/2657 , H04L27/2675
摘要： A timing error compensation system in an OFMD/CDMA communication system includes an analog-to-digital converter for converting an OFDM signal, comprised of a data symbol stream in which a pilot symbol is inserted at intervals of a prescribed number of data symbols, received from a transmitter, to a digital OFDM symbol stream by prescribed sampling synchronization, a guard interval remover for removing a guard interval inserted in the OFDM symbol by prescribed frame synchronization, and a fast Fourier transform (FFT) device for performing fast Fourier transform on the guard interval-removed OFDM symbol and outputting a data symbol stream. In the time error compensation system, a pilot symbol detector receives the data symbol stream and detects the pilot symbols inserted in the data symbol stream at prescribed intervals. A timing compensator determines a linear phase difference line for the detected pilot symbol, generates a timing error estimation signal according to the determined linear phase difference line, and provides the timing error estimation signal to the analog-to-digital converter and the guard interval remover so as to determine the sampling synchronization and the frame synchronization.
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公开(公告)号：EP1048116B1
公开(公告)日：2006-12-27
申请号：EP99941830.4
申请日：1999-08-30
发明人： PARK, Su-Won , LEE, Hyun-Kyu
IPC分类号： H04B1/707
CPC分类号： H04B1/708 , H04B1/7093 , H04B2201/70702
摘要： A PN sequence identifying device in a receiver in an asynchronous CDMA communication system. The receiver receives first orthogonal Gold codes (OGCs) on a primary sync channel and second OGCs on a secondary sync channel synchronized with the primary sync channel symbol by symbol. In the PN sequence identifying device, a first OGC detector detects the first OGCs and obtains a first symbol energy. A first synchronizer receives the first symbol energy, synchronizes chips, symbols, and slots, and outputs a first sync signal. A second OGC detector, upon reception of the first sync signal, detects the second OGCs each time the first sync signal is received, and obtains second symbol energies in base station identifying group units. A hopping pattern generator compares the first symbol energy with the second symbol energies, determines whether null signs are in the second OGCs, determines the order of the null signs if the null signs are present, and generates a hopping pattern of the second OGCs. A second synchronizer synchronizes frames based on the hopping pattern and outputs a second sync signal. A PN sequence generator (268) receives the first and second signals and the hopping pattern and generates a PN sequence.
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4.发明公开AFC DEVICE AND METHOD OF CONTROLLING RECEPTION FREQUENCY IN A DUAL-MODE TERMINAL 有权AFC设备和方法，用于控制接收频率在双模终端
公开(公告)号：EP1050109A2
公开(公告)日：2000-11-08
申请号：EP99941839.5
申请日：1999-09-02
发明人： LEE, Hyun-Kyu
IPC分类号： H03L7/00
CPC分类号： H04M3/00 , H03J7/02 , H03J2200/02 , H04L2027/0065 , H04L2027/0071 , H04W88/06
摘要： An AFC (Automatic Frequency Control) device and a method of controlling reception frequency in a dual-mode terminal. When a dual-mode terminal uses one or two AFC circuits (151), time required for acquiring tracking synchronization in a PLL circuit (117, 137) for a frequency can be reduced using a test augmentation frequency being an integer multiple of a tracking synchronization acquiring residual frequency of a PLL (117, 137) circuit for another frequency to which the first frequency transits for reliable synchronization acquisition. Errors with respect to an output dynamic range caused by use of two AFCs are reduced and thus the demodulation performance of a receiver is ensured by varying quantization bits of an A/D clock based on the dynamic range of residual errors in a frequency area. The demodulation performance can also be ensured by operating an ACPE circuit for an AFC circuit having many residual frequency errors. In this method, the frequency characteristics of the dual-mode terminal are stabilized and the stability of a demodulator is increased due to a frequency offset. As a result, the stable demodulator performance is ensured.
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公开(公告)号：EP1051818B1
公开(公告)日：2008-08-13
申请号：EP99958501.1
申请日：1999-12-01
发明人： LEE, Hyun-Kyu
CPC分类号： H04L5/026 , H04L27/2659 , H04L27/266
摘要： A frequency synchronizing device for an OFDM/CDMA communication system which exchanges data using an OFDM frame including OFDM symbols each comprised of a plurality of data samples, and a guard interval inserted at the head of each symbol to prevent interference between the symbols. The frequency synchronizing device comprises a frequency corrector (161) for compensating for a frequency offset of received analog data according to a frequency correction signal; an analog/digital converter (162) for converting the received analog data to OFDM frame; and a frequency synchronizer (200) for detecting copy data which is used for creating the guard interval from the OFDM frame and is comprised of some data samples out of the OFDM symbols, to sequentially estimate coarse, regular and fine frequency offsets, and providing the frequency corrector (161) with the frequency correction signal corresponding to the estimated frequency offsets.
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公开(公告)号：EP1051818A1
公开(公告)日：2000-11-15
申请号：EP99958501.1
申请日：1999-12-01
发明人： LEE, Hyun-Kyu
CPC分类号： H04L5/026 , H04L27/2659 , H04L27/266
摘要： A frequency synchronizing device for an OFDM/CDMA communication system which exchanges data using an OFDM frame including OFDM symbols each comprised of a plurality of data samples, and a guard interval inserted at the head of each symbol to prevent interference between the symbols. The frequency synchronizing device comprises a frequency corrector (161) for compensating for a frequency offset of received analog data according to a frequency correction signal; an analog/digital converter (162) for converting the received analog data to OFDM frame; and a frequency synchronizer (200) for detecting copy data which is used for creating the guard interval from the OFDM frame and is comprised of some data samples out of the OFDM symbols, to sequentially estimate coarse, regular and fine frequency offsets, and providing the frequency corrector (161) with the frequency correction signal corresponding to the estimated frequency offsets.
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公开(公告)号：EP1048116A2
公开(公告)日：2000-11-02
申请号：EP99941830.4
申请日：1999-08-30
发明人： PARK, Su-Won , LEE, Hyun-Kyu
IPC分类号： H04B1/00
CPC分类号： H04B1/708 , H04B1/7093 , H04B2201/70702
摘要： A PN sequence identifying device in a receiver in an asynchronous CDMA communication system. The receiver receives first orthogonal Gold codes (OGCs) on a primary sync channel and second OGCs on a secondary sync channel synchronized with the primary sync channel symbol by symbol. In the PN sequence identifying device, a first OGC detector detects the first OGCs and obtains a first symbol energy. A first synchronizer receives the first symbol energy, synchronizes chips, symbols, and slots, and outputs a first sync signal. A second OGC detector, upon reception of the first sync signal, detects the second OGCs each time the first sync signal is received, and obtains second symbol energies in base station identifying group units. A hopping pattern generator compares the first symbol energy with the second symbol energies, determines whether null signs are in the second OGCs, determines the order of the null signs if the null signs are present, and generates a hopping pattern of the second OGCs. A second synchronizer synchronizes frames based on the hopping pattern and outputs a second sync signal. A PN sequence generator (268) receives the first and second signals and the hopping pattern and generates a PN sequence.
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