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    • 1. 发明授权
    • Method and device for aquiring a channel with frequency offset less than half symbol rate
    • 具有频率偏移小于半符号率的信道的方法和装置
    • US08406345B2
    • 2013-03-26
    • US12926298
    • 2010-11-09
    • Chun-Chieh Tseng
    • Chun-Chieh Tseng
    • H04L27/00
    • H04L27/0014H04L27/22H04L2027/003H04N21/4263
    • A method and device for acquiring a channel with a frequency offset less than half symbol rate is applied but not limited to a DVB-S system. A target channel is selected to obtain a carrier frequency and a symbol rate for programming a tuner to obtain a digital baseband signal. A down-sampling factor is calculated based on the symbol rate for performing a down-sampling operation to obtain a down-sampling signal that passes through a digital matched filter to generate a filtered spectrum. A moving average and spectrum inversion is applied to detect location of the target channel and find two cross points thereby estimating a coarse carrier frequency offset for compensating the tuner and a coarse symbol rate. A fine carrier frequency offset and a symbol rate estimate are estimated for compensating and acquiring the target channel when the target channel is successfully detected.
    • 应用具有频率偏移小于一半符号率的信道的方法和装置,但不限于DVB-S系统。 选择目标通道以获得用于编程调谐器以获得数字基带信号的载波频率和符号率。 基于用于执行下采样操作的符号率来计算下采样因子,以获得通过数字匹配滤波器以产生滤波频谱的下采样信号。 应用移动平均和频谱反演来检测目标信道的位置,并找到两个交叉点,从而估计用于补偿调谐器的粗略载波频率偏移和粗略符号率。 估计精细载波频率偏移和符号率估计,用于在成功检测目标信道时补偿和获取目标信道。
    • 3. 发明申请
    • SISO decoder for a block code
    • SISO解码器用于块代码
    • US20120076247A1
    • 2012-03-29
    • US12929434
    • 2011-01-25
    • Chun-Chieh Tseng
    • Chun-Chieh Tseng
    • H03D1/00
    • H03M13/3784H03M13/1102H03M13/21H03M13/2906H03M13/451
    • A soft-in-soft-out (SISO) decoder for a general block code includes a source bit generator which generates k guessed source bits; a channel encoder which maps the k guessed source bits to an n-bit channel codeword; a QAM symbol mapper which generates a locally generated symbol sequence comprising m consecutive QAM symbols based on the n-bit channel codeword; a correlator which receives a symbol sequence, a channel state information sequence, and the locally generated symbol sequence to calculate a correlation associated with the received symbol sequence based on the received symbol sequence, the channel state information sequence, and the locally generated symbol sequence; and a log-likelihood ratio calculator which is connected to the source bit generator and the correlator to thereby calculate the required log-likelihood ratios associated with all coded bits corresponding to the received symbol sequence.
    • 用于通用块码的软进软(SISO)解码器包括产生k个猜测源比特的源比特发生器; 将k个猜测的源比特映射到n比特信道码字的信道编码器; QAM符号映射器,其基于所述n位信道码字生成包括m个连续QAM符号的本地生成的符号序列; 相关器,其接收符号序列,信道状态信息序列和本地生成的符号序列,以基于接收的符号序列,信道状态信息序列和本地产生的符号序列来计算与接收到的符号序列相关联的相关性; 以及对数似然比计算器,其连接到源比特发生器和相关器,从而计算与对应于所接收的符号序列的所有编码比特相关联的所需对数似然比。
    • 7. 发明授权
    • SNR estimation system for multi-carrier communication
    • 用于多载波通信的SNR估计系统
    • US08279914B2
    • 2012-10-02
    • US12656924
    • 2010-02-19
    • Chun-Chieh Tseng
    • Chun-Chieh Tseng
    • H04B17/00
    • H04B17/336
    • A signal to noise power ratio estimation system for multi-carrier communication includes a phase rotator, a power estimator, a channel gain calculator, an average and selection device, a combination and calculation device and a decibel (dB) transformation device. The signal to noise power ratio estimation system makes use of a transmit parameter signaling or pilot subcarriers to blindly assist in the signal to noise power ratio estimation to accordingly gain an estimated signal to noise power ratio accurately, and thus a communication system can be calibrated to a preferred condition.
    • 用于多载波通信的信噪比估计系统包括相位旋转器,功率估计器,通道增益计算器,平均和选择装置,组合和计算装置以及分贝(dB)变换装置。 信噪比估计系统利用发射参数信令或导频副载波盲目协助信噪比估计,从而准确地获得估计的信噪比功率比,从而将通信系统校准为 优选条件。
    • 8. 发明申请
    • Blind scan system and method in a DVB-S system
    • DVB-S系统中的盲扫系统和方法
    • US20110135042A1
    • 2011-06-09
    • US12926063
    • 2010-10-25
    • Chun-Chieh TsengPo-Fang Huang
    • Chun-Chieh TsengPo-Fang Huang
    • H04L27/10
    • H04L27/0014H04L2027/003
    • A blind scan system in a DVB-S system includes a spectrum parameter extractor to fetch and calculate a coarse carrier frequency offset and coarse symbol rate of a signal; a digital mixer to depend on the coarse frequency offset to shift the center of a spectrum of the signal to a position where a DC part of a working spectrum of a digital matched filter locates, so as to produce an offset signal; and an interpolator to perform a down-sampling on the offset signal according to the coarse symbol rate in order to improve the in-band signal-to-noise ratio of the digital matched filter and mitigate impacts due to adjacent channel interferences. Thus, the fine carrier frequency offset and fine symbol rate estimation can be performed accurately.
    • DVB-S系统中的盲扫系统包括频谱参数提取器,用于获取和计算信号的粗略载波频率偏移和粗略符号率; 依赖于粗频率偏移的数字混频器将信号频谱的中心移动到数字匹配滤波器的工作频谱的DC部分所在的位置,以产生偏移信号; 以及内插器,用于根据粗略符号率对偏移信号执行下采样,以便改进数字匹配滤波器的带内信噪比并减轻由相邻信道干扰引起的影响。 因此,可以精确地执行精细载波频率偏移和精细符号率估计。
    • 9. 发明申请
    • Method and device for aquiring a channel with frequency offset less than half symbol rate
    • 具有频率偏移小于半符号率的信道的方法和装置
    • US20110129045A1
    • 2011-06-02
    • US12926298
    • 2010-11-09
    • Chun-Chieh Tseng
    • Chun-Chieh Tseng
    • H04L27/06
    • H04L27/0014H04L27/22H04L2027/003H04N21/4263
    • A method and device for acquiring a channel with a frequency offset less than half symbol rate is applied but not limited to a DVB-S system. A target channel is selected to obtain a carrier frequency and a symbol rate for programming a tuner to obtain a digital baseband signal. A down-sampling factor is calculated based on the symbol rate for performing a down-sampling operation to obtain a down-sampling signal that passes through a digital matched filter to generate a filtered spectrum. A moving average and spectrum inversion is applied to detect location of the target channel and find two cross points thereby estimating a coarse carrier frequency offset for compensating the tuner and a coarse symbol rate. A fine carrier frequency offset and a symbol rate estimate are estimated for compensating and acquiring the target channel when the target channel is successfully detected.
    • 应用具有频率偏移小于一半符号率的信道的方法和装置,但不限于DVB-S系统。 选择目标通道以获得用于编程调谐器以获得数字基带信号的载波频率和符号率。 基于用于执行下采样操作的符号率来计算下采样因子,以获得通过数字匹配滤波器以产生滤波频谱的下采样信号。 应用移动平均和频谱反演来检测目标信道的位置,并找到两个交叉点,从而估计用于补偿调谐器的粗略载波频率偏移和粗略符号率。 估计精细载波频率偏移和符号率估计,用于在成功检测目标信道时补偿和获取目标信道。