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公开(公告)号：US07423960B2
公开(公告)日：2008-09-09
申请号：US10745754
申请日：2003-12-27
申请人： Kuei-Ann Wen , Chia-Sheng Peng , Yuan-Shin Chuang
发明人： Kuei-Ann Wen , Chia-Sheng Peng , Yuan-Shin Chuang
CPC分类号： H04L27/2657 , H04L27/261 , H04L27/2675 , H04L27/2695
摘要： A novel and simplified orthogonal frequency division multiplexing (OFDM) equalizer uses a coordinate rotation digital computer (CORDIC) to convert the estimated channel effects from rectangular coordinate to polar coordinate and to compensate the phase error with the same CORDIC circuit of synchronization. The OFDM equalizer comprises: a fast Fourier transformer (FFT); a channel estimation circuit; a coordinate translator, comprising a CORDIC circuit, to translate the channel estimation value into a polar coordinate value; a pilot extractor to extract pilot signals and to track minor phase offsets of the received signal to synchronize phase of said received signal; a phase rotator to compensate phase of the received signal according to the channel estimation value and the phase tracking estimation value, to generate the real value and imaginary value of the phase compensated signal; and an amplitude adjustment circuit. The coordinate translator and the phase rotator use the same CORDIC circuit.
摘要翻译： 一种新颖简化的正交频分复用（OFDM）均衡器使用坐标旋转数字计算机（CORDIC）将估计的信道效应从直角坐标转换为极坐标，并且通过同步的CORDIC电路来补偿相位误差。 OFDM均衡器包括：快速傅里叶变换器（FFT）; 信道估计电路; 包括CORDIC电路的坐标转换器，用于将信道估计值转换为极坐标值; 导频提取器，用于提取导频信号并跟踪接收信号的次相位偏移，以使所述接收信号的相位同步; 相位旋转器，用于根据信道估计值和相位跟踪估计值补偿接收信号的相位，以产生相位补偿信号的实数值和虚数值; 和振幅调整电路。 坐标转换器和相位旋转器使用相同的CORDIC电路。
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公开(公告)号：US20050216540A1
公开(公告)日：2005-09-29
申请号：US10811450
申请日：2004-03-25
申请人： Kuei-Ann Wen , Chia-Sheng Peng , Yuan-Shin Chuang
发明人： Kuei-Ann Wen , Chia-Sheng Peng , Yuan-Shin Chuang
CPC分类号： G06F7/5446 , G06T3/60
摘要： The CORDIC circuit of this invention comprises a buffer memory to record a plurality or a plurality of group of coordinate values; a phase selector to determine a rotation direction according to values recorded in said buffer memory; a rotation calculator to rotate an input coordinate for a predetermined angle and to calculate resulting coordinate value after such rotation; a rotation counter to count number of rotation being made to said input coordinate; and an angle accumulator to accumulate total rotation angle being made to said input coordinate according to value recorded by said rotation counter. The CORDIC circuit of this invention may further comprise a bit selector to shift bits of said input coordinate.
摘要翻译： 本发明的CORDIC电路包括用于记录多个或多组坐标值的缓冲存储器; 相位选择器，用于根据记录在所述缓冲存储器中的值来确定旋转方向; 旋转计算器，用于将输入坐标旋转预定角度，并且在所述旋转之后计算所得到的坐标值; 旋转计数器，对所述输入坐标进行计数旋转数; 以及角度累加器，根据由所述旋转计数器记录的值累积对所述输入坐标的总旋转角度。 本发明的CORDIC电路还可以包括用于移位所述输入坐标的位的位选择器。
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公开(公告)号：US20050157636A1
公开(公告)日：2005-07-21
申请号：US10745754
申请日：2003-12-27
申请人： Kuei-Ann Wen , Chia-Sheng Peng , Yuan-Shin Chuang
发明人： Kuei-Ann Wen , Chia-Sheng Peng , Yuan-Shin Chuang
CPC分类号： H04L27/2657 , H04L27/261 , H04L27/2675 , H04L27/2695
摘要： A novel and simplified orthogonal frequency division multiplexing (OFDM) equalizer uses a coordinate rotation digital computer (CORDIC) to convert the estimated channel effects from rectangular coordinate to polar coordinate and to compensate the phase error with the same CORDIC circuit of synchronization. The OFDM equalizer comprises: a fast Fourier transformer (FFT), to conduct Fourier transformation to received signals to obtain samples of the received signals; a channel estimation circuit to estimate channel effects of a received signal as transformed by the FFT to generate a channel effect estimation value; a coordinate translator, comprising a CORDIC circuit, to translate the channel estimation value into a polar coordinate value; a pilot extractor, provided downstream to the FFT, to extract pilot signals and to track minor phase offsets of the received signal to synchronize phase of said received signal; a phase rotator to compensate phase of the received signal according to the channel estimation value and the phase tracking estimation value, to generate the real value and imaginary value of the phase compensated signal; and an amplitude adjustment circuit to adjust amplitude of the compensated signal according to the amplitude adjustment value of the channel effect estimation value of the channel estimation circuit. In the present invention, the coordinate translator and the phase rotator use the same CORDIC circuit.
摘要翻译： 一种新颖简化的正交频分复用（OFDM）均衡器使用坐标旋转数字计算机（CORDIC）将估计的信道效应从直角坐标转换为极坐标，并且通过同步的CORDIC电路来补偿相位误差。 OFDM均衡器包括：快速傅立叶变换器（FFT），对接收到的信号进行傅立叶变换以获得接收信号的采样; 用于估计由FFT变换的接收信号的信道效应以产生信道效应估计值的信道估计电路; 包括CORDIC电路的坐标转换器，用于将信道估计值转换为极坐标值; 提供在FFT的下游的导频提取器，以提取导频信号并跟踪接收信号的次相位偏移，以使所述接收信号的相位同步; 相位旋转器，用于根据信道估计值和相位跟踪估计值补偿接收信号的相位，以产生相位补偿信号的实数值和虚数值; 以及幅度调整电路，用于根据信道估计电路的信道效应估计值的幅度调整值来调整补偿信号的幅度。 在本发明中，坐标转换器和相位旋转器使用相同的CORDIC电路。
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公开(公告)号：US08411803B2
公开(公告)日：2013-04-02
申请号：US12862769
申请日：2010-08-25
申请人： Yuan-Shin Chuang
发明人： Yuan-Shin Chuang
IPC分类号： H04L27/06
CPC分类号： H04L27/38 , H04L27/0012
摘要： A method and an apparatus for modulation recognition in communication system are provided. First, a plurality of constellation corresponding different modulation types are provided, wherein each constellation has a plurality of points. An input signal is de-mapped to find out a nearest point located nearest to a position of the input signal in each constellation. The distances from the nearest points to the position of the input signal are respectively counted to obtain a plurality of distance statistics values corresponding to different modulation types. The apparatus compares the distance statistics values for recognizing the modulation type of the input signal.
摘要翻译： 提供了一种用于通信系统中的调制识别的方法和装置。 首先，提供对应于不同调制类型的多个星座，其中每个星座具有多个点。 输入信号被去映射以找出最靠近每个星座中输入信号位置的最近点。 分别计数从最近点到输入信号位置的距离，以获得对应于不同调制类型的多个距离统计值。 该装置比较用于识别输入信号的调制类型的距离统计值。
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公开(公告)号：US20110261906A1
公开(公告)日：2011-10-27
申请号：US12862769
申请日：2010-08-25
申请人： Yuan-Shin Chuang
发明人： Yuan-Shin Chuang
IPC分类号： H04L27/06
CPC分类号： H04L27/38 , H04L27/0012
摘要： A method and an apparatus for modulation recognition in communication system are provided. First, a plurality of constellation corresponding different modulation types are provided, wherein each constellation has a plurality of points. An input signal is de-mapped to find out a nearest point located nearest to a position of the input signal in each constellation. The distances from the nearest points to the position of the input signal are respectively counted to obtain a plurality of distance statistics values corresponding to different modulation types. The apparatus compares the distance statistics values for recognizing the modulation type of the input signal.
摘要翻译： 提供了一种用于通信系统中的调制识别的方法和装置。 首先，提供对应于不同调制类型的多个星座，其中每个星座具有多个点。 输入信号被去映射以找出最靠近每个星座中输入信号位置的最近点。 分别计数从最近点到输入信号位置的距离，以获得对应于不同调制类型的多个距离统计值。 该装置比较用于识别输入信号的调制类型的距离统计值。
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