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1. 发明授权

US08605828B2 Blind mechanism for demodulating offset QPSK signals in the presence of carrier phase error 有权
标题翻译：在存在载波相位误差的情况下解调偏移QPSK信号的盲机制
公开(公告)号：US08605828B2
公开(公告)日：2013-12-10
申请号：US13398936
申请日：2012-02-17
申请人： Sartaj Chaudhary , Vijaya Yajnanarayana , I Zakir Ahmed
发明人： Sartaj Chaudhary , Vijaya Yajnanarayana , I Zakir Ahmed
IPC分类号： H04L27/22 , H04B1/10
CPC分类号： H04L27/2331 , H04L27/0014 , H04L2027/0026 , H04L2027/0057 , H04L2027/0067
摘要： A computer-implemented system and method for blind demodulation of an offset QPSK input signal, involving repeatedly performing a set of operations, including: (a) applying a phase correction to the input signal based on an estimate of a carrier phase offset of the input signal to obtain a first modified signal; (b) shifting a quadrature component of the first modified signal by half a symbol period relative to an inphase component to obtain a second modified signal; (c) extracting a first sequence of symbols from the second modified signal, where the extraction includes estimating a symbol timing offset from the second modified signal; (d) performing hard-decision demodulation on the first sequence of symbols to obtain a second sequence of reference symbols; (e) computing a phase difference between the first sequence of symbols and second sequence of reference symbols; and (f) updating the carrier phase offset estimate using the phase difference.
摘要翻译：一种用于偏移QPSK输入信号的盲解调的计算机实现的系统和方法，包括：重复执行一组操作，包括：（a）基于输入的载波相位偏移的估计对输入信号施加相位校正信号以获得第一修改信号; （b）将第一修改信号的正交分量相对于同相分量移位一半符号周期以获得第二修改信号; （c）从所述第二修改信号中提取第一符号序列，其中所述提取包括估计与所述第二修改信号的符号定时偏移; （d）对所述第一符号序列执行硬判决解调以获得第二参考符号序列; （e）计算第一符号序列与第二参考符号序列之间的相位差; 和（f）使用相位差来更新载波相位偏移估计。

2. 发明申请

US20130216005A1 Blind Mechanism for Demodulating Offset QPSK Signals in the Presence of Carrier Phase Error 有权
标题翻译：在存在载波相位误差的情况下解调偏移QPSK信号的盲机制
公开(公告)号：US20130216005A1
公开(公告)日：2013-08-22
申请号：US13398936
申请日：2012-02-17
申请人： Sartaj Chaudhary , Vijaya Yajnanarayana , I Zakir Ahmed
发明人： Sartaj Chaudhary , Vijaya Yajnanarayana , I Zakir Ahmed
IPC分类号： H04L27/00
CPC分类号： H04L27/2331 , H04L27/0014 , H04L2027/0026 , H04L2027/0057 , H04L2027/0067
摘要： A computer-implemented system and method for blind demodulation of an offset QPSK input signal, involving repeatedly performing a set of operations, including: (a) applying a phase correction to the input signal based on an estimate of a carrier phase offset of the input signal to obtain a first modified signal; (b) shifting a quadrature component of the first modified signal by half a symbol period relative to an inphase component to obtain a second modified signal; (c) extracting a first sequence of symbols from the second modified signal, where the extraction includes estimating a symbol timing offset from the second modified signal; (d) performing hard-decision demodulation on the first sequence of symbols to obtain a second sequence of reference symbols; (e) computing a phase difference between the first sequence of symbols and second sequence of reference symbols; and (f) updating the carrier phase offset estimate using the phase difference.
摘要翻译：一种用于偏移QPSK输入信号的盲解调的计算机实现的系统和方法，包括：重复执行一组操作，包括：（a）基于输入的载波相位偏移的估计对输入信号施加相位校正信号以获得第一修改信号; （b）将第一修改信号的正交分量相对于同相分量移位一半符号周期以获得第二修改信号; （c）从所述第二修改信号中提取第一符号序列，其中所述提取包括估计与所述第二修改信号的符号定时偏移; （d）对所述第一符号序列执行硬判决解调以获得第二参考符号序列; （e）计算第一符号序列与第二参考符号序列之间的相位差; 和（f）使用相位差来更新载波相位偏移估计。

3. 发明授权

US08446974B2 Blind mechanism for the joint estimation of frequency offset and phase offset for QAM modulated signals 有权
标题翻译：用于联合估计QAM调制信号的频偏和相位偏移的盲机制
公开(公告)号：US08446974B2
公开(公告)日：2013-05-21
申请号：US12694388
申请日：2010-01-27
申请人： I Zakir Ahmed , Krishna Bharadwaj , Vijaya Yajnanarayana
发明人： I Zakir Ahmed , Krishna Bharadwaj , Vijaya Yajnanarayana
IPC分类号： H04L5/12
CPC分类号： H04L27/3405 , H04L27/0014 , H04L2027/003
摘要： A mechanism for jointly correcting carrier phase and carrier frequency errors in a demodulated signal. A computer system may receive samples of a baseband input signal (resulting from QAM demodulation). The computer system may compute values of a cost function J over a grid in a 2D angle-frequency space. A cost function value J(θ,ω) is computed for each point (θ,ω) in the grid by (a) applying a phase adjustment of angle θ and a frequency adjustment of frequency ω to the input signal; (b) performing one or more iterations of the K-means algorithm on the samples of the adjusted signal; (c) generated a sum on each K-means cluster; and (d) adding the sums. The point (θe,ωe) in the 2D angle-frequency space that minimizes the cost function J serves an estimate for the carrier phase error and carrier frequency error. The estimated errors may be used to correct the input signal.
摘要翻译：一种在解调信号中联合校正载波相位和载波频率误差的机制。计算机系统可以接收基带输入信号的采样（由QAM解调产生）。计算机系统可以在2D角度 - 频率空间中计算网格上的成本函数J的值。通过以下方式计算网格中每个点（θ，ω）的成本函数值J（θ，ω）：（a）将角度θ的相位调整和频率ω的频率调整应用于输入信号; （b）对所调整的信号的采样执行K均值算法的一个或多个迭代; （c）在每个K-means集群上产生一个和; 和（d）加总和。最小化成本函数J的2D角度 - 频率空间中的点（θe，omegae）用于载波相位误差和载波频率误差的估计。可以使用估计的误差来校正输入信号。

4. 发明申请

US20110182387A1 Blind Mechanism for the Joint Estimation of Frequency Offset and Phase Offset for QAM Modulated Signals 有权
标题翻译：用于QAM调制信号的频偏和相位偏移联合估计的盲机制
公开(公告)号：US20110182387A1
公开(公告)日：2011-07-28
申请号：US12694388
申请日：2010-01-27
申请人： I Zakir Ahmed , Krishna Bharadwaj , Vijaya Yajnanarayana
发明人： I Zakir Ahmed , Krishna Bharadwaj , Vijaya Yajnanarayana
IPC分类号： H04L27/14 , H04L27/38
CPC分类号： H04L27/3405 , H04L27/0014 , H04L2027/003
摘要： A mechanism for jointly correcting carrier phase and carrier frequency errors in a demodulated signal. A computer system may receive samples of a baseband input signal (resulting from QAM demodulation). The computer system may compute values of a cost function J over a grid in a 2D angle-frequency space. A cost function value J(θ,ω) is computed for each point (θ,ω) in the grid by (a) applying a phase adjustment of angle θ and a frequency adjustment of frequency ω to the input signal; (b) performing one or more iterations of the K-means algorithm on the samples of the adjusted signal; (c) generated a sum on each K-means cluster; and (d) adding the sums. The point (θe,ωe) in the 2D angle-frequency space that minimizes the cost function J serves an estimate for the carrier phase error and carrier frequency error. The estimated errors may be used to correct the input signal.
摘要翻译：一种在解调信号中联合校正载波相位和载波频率误差的机制。计算机系统可以接收基带输入信号的采样（由QAM解调产生）。计算机系统可以在2D角度 - 频率空间中计算网格上的成本函数J的值。通过（a）应用角度和角度的相位调整，计算网格中每个点（＆Theta;，ω）的成本函数值J（＆amp; 以及对输入信号的频率ω的频率调整; （b）对所调整的信号的采样执行K均值算法的一个或多个迭代; （c）在每个K-means集群上产生一个和; 和（d）加总和。使成本函数J最小化的2D角度 - 频率空间中的点（＆Theta; e，ωe）用于载波相位误差和载波频率误差的估计。可以使用估计的误差来校正输入信号。

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