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公开(公告)号：KR1020100073062A
公开(公告)日：2010-07-01
申请号：KR1020080131645
申请日：2008-12-22
Applicant: 한국전자통신연구원
CPC classification number: H04L27/22 , H04L27/0014 , H04L2027/0067 , H04L1/004
Abstract: PURPOSE: A frequency error estimating device and a frequency error estimating method thereof are provided to easily estimate a frequency error by low power consumption. CONSTITUTION: A plurality of autocorrelators(141-144) calculates autocorrelation through values outputted from the first registers. The second registers store the calculated autocorrelation values. Phase difference calculation blocks(161-165) calculate phase difference between symbols adjacent from the values saved in the second registers. An adder(177) adds up the calculated phase differences. The adder calculates a frequency error.
Abstract translation: 目的：提供一种频率误差估计装置及其频率误差估计方法，以便通过低功耗容易地估计频率误差。 构成：多个自相关器（141-144）通过从第一寄存器输出的值来计算自相关。 第二个寄存器存储计算的自相关值。 相位差计算块（161-165）计算与保存在第二寄存器中的值相邻的符号之间的相位差。 加法器（177）将计算的相位差相加。 加法器计算频率误差。
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公开(公告)号：KR1020100062894A
公开(公告)日：2010-06-10
申请号：KR1020090078691
申请日：2009-08-25
Applicant: 한국전자통신연구원
IPC: H04N7/015
CPC classification number: H04H40/90 , H04H20/74 , H04H2201/10 , H04N5/08
Abstract: PURPOSE: A receiving circuit of the satellite digital video broadcasting system is provided, which integrates the duplicated auto correlation calculation circuits into one circuit, thereby the complexity of circuit is lowered conspicuously. CONSTITUTION: A common auto correlation unit(120) multiplies the auto correlation coefficient to the synchronized receiving symbol. A frame synchronization unit(130) detects the SOF(Start Of Frame) from the self correlation by receiving symbol. The SOF is the synchronization word indicating the beginning of frame. A frequency synchronization unit(140) presumes the frequency error information from the self correlation by receiving symbol and the SOF. An SNR estimation unit(150) presumes the SNR(Signal to Noise Ratio) from the self correlation by receiving symbol and the SOF.
Abstract translation: 目的：提供卫星数字视频广播系统的接收电路，将重复的自相关计算电路集成到一个电路中，从而显着降低电路的复杂度。 构成：公共自相关单元（120）将自相关系数与同步接收符号相乘。 帧同步单元（130）通过接收符号从自相关检测SOF（帧起始）。 SOF是指示帧开始的同步字。 频率同步单元（140）通过接收符号和SOF来假设来自自相关的频率误差信息。 SNR估计单元（150）通过接收符号和SOF来假设来自自相关的SNR（信噪比）。
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公开(公告)号：KR1020110070682A
公开(公告)日：2011-06-24
申请号：KR1020100030053
申请日：2010-04-01
Applicant: 한국전자통신연구원
IPC: H04L27/18
CPC classification number: H04L25/067 , H04L27/18
Abstract: PURPOSE: A soft-decision demapping method of a digital signal is provided to reduce comparison calculation operation, by selecting a spot positioned in constellation with only phase information of a symbol in advance. CONSTITUTION: Reference symbols are selected using most significant bit(MSB) of a received signal. The selected reference symbols are selected according to location probability of the received signal among total reference symbols on the constellation. The maximum value of the log likelihood ratio(LLR) is acquired for the selected reference symbols. The total reference symbols are phase-shifted.
Abstract translation: 目的：提供一种数字信号的软决策解映射方法，以通过仅预先标识符号中仅定位符号的相位信息选择位于星座中的光点来减少比较计算操作。 构成：使用接收信号的最高有效位（MSB）来选择参考符号。 所选择的参考符号是根据星座上的总参考符号之间的接收信号的位置概率来选择的。 对于所选择的参考符号获取对数似然比（LLR）的最大值。 总参考符号是相移的。
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公开(公告)号：KR101210279B1
公开(公告)日：2012-12-10
申请号：KR1020090078691
申请日：2009-08-25
Applicant: 한국전자통신연구원
IPC: H04N7/015
Abstract: 본발명은위성디지털비디오방송시스템의수신회로에관한것으로, 수신심볼과추정된주파수오차정보를곱하여동기화된수신심볼을출력하는곱셈부; 상기동기화된수신심볼에자기상관계수를곱하여수신심볼별자기상관도를획득하는공통자기상관부; 상기수신심볼별자기상관도로부터프레임의시작을표시하는동기워드인 SOF(Start Of Frame)을검출하는프레임동기부; 상기수신심볼별자기상관도와상기 SOF로부터주파수오차정보를추정하는주파수동기부; 및상기수신심볼별자기상관도와상기 SOF로부터 SNR(Signal to Noise Ratio)를추정하는 SNR 추정부를포함한다.
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