公开(公告)号：US07333548B2

公开(公告)日：2008-02-19

申请号：US10705520

申请日：2003-11-10

申请人： Hung-Kun Chen

发明人： Hung-Kun Chen

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H04L27/2657 ,  H04L27/2662 ,  H04L27/2695

摘要： A phase drift compensation scheme for multi-carrier systems. According to the invention, a timing offset compensator is provided to compensate for a timing offset in a current symbol after taking an N-point FFT. Then a phase estimator computes a phase estimate for the current symbol based on a function of a channel response of each pilot subcarrier, transmitted data on each pilot subcarrier, and a timing compensated version of the current symbol on the pilot subcarrier locations. From the phase estimate, a tracking unit can generate a phase tracking value for the current symbol. Thereafter, a phase compensator uses the phase tracking value to compensate the timing compensated version of the current symbol for the effect of phase drift.

摘要翻译： 多载波系统的相位漂移补偿方案。 根据本发明，提供了一种定时偏移补偿器，用于在采取N点FFT之后补偿当前符号中的定时偏移。 然后，相位估计器基于每个导频子载波的信道响应，每个导频子载波上的发送数据和导频子载波位置上的当前符号的定时补偿版本的函数来计算当前符号的相位估计。 从相位估计中，跟踪单元可以产生当前符号的相位跟踪值。 此后，相位补偿器使用相位跟踪值来补偿当前符号的相位漂移的影响的定时补偿版本。

公开(公告)号：US20070047670A1

公开(公告)日：2007-03-01

申请号：US11215102

申请日：2005-08-30

申请人： Hung-Kun Chen

发明人： Hung-Kun Chen

IPC分类号： H04L27/00

CPC分类号： H04L25/061 ,  H03G3/3068 ,  H04L25/069

摘要： An automatic gain control mechanism with high-frequency detection. During a predetermined period, the cumulative strength of the real part of a complex-valued input signal is compared with that of the imaginary part of the complex-valued input signal. The zero crossings in either the real part or imaginary part of the complex-valued input signal are selectively totaled contingent upon which part of the complex-valued signal possesses the larger cumulative strength. If the zero crossings total exceeds a predetermined threshold, the automatic gain control mechanism starts detecting a normal packet signal and activating gain control over the detected normal packet signal.

摘要翻译： 具有高频检测功能的自动增益控制机构。 在预定时段期间，将复值输入信号的实部的累积强度与复值输入信号的虚部的累积强度进行比较。 复数值输入信号的实部或虚部中的过零点有选择地总计，这取决于复值信号的哪一部分具有较大的累积强度。 如果过零点总数超过预定阈值，则自动增益控制机构开始检测正常分组信号并激活对所检测到的正常分组信号的增益控制。

公开(公告)号：US06990156B2

公开(公告)日：2006-01-24

申请号：US10062116

申请日：2002-01-30

申请人： Hung-Kun Chen

发明人： Hung-Kun Chen

IPC分类号： H04L27/14

CPC分类号： C30B25/18 ,  H04L27/0014 ,  H04L2027/0065

摘要： A frequency offset estimation based on state-based differential accumulation and the device thereof are disclosed. The concept of the sate-based operation is introduced by mathematical derivations. The knowledge of received data symbols and timing is utilized. Then the detailed operations are also given by both equations and conceptual descriptions. It is unnecessary to estimate the channel jointly or concurrently, while the differential operation over the received samples of the same state is performed. Such operation is obviously much simpler and easier to implement in VLSI than all the other techniques.

公开(公告)号：US20050084025A1

公开(公告)日：2005-04-21

申请号：US10689424

申请日：2003-10-20

申请人： Hung-Kun Chen

发明人： Hung-Kun Chen

IPC分类号： H04K1/10 ,  H04L25/02 ,  H04L27/26

CPC分类号： H04L27/2662 ,  H04L25/0202 ,  H04L27/2695

摘要： A robust timing offset compensation scheme for multi-carrier systems. According to the invention, a timing offset compensator is provided to compensate a current symbol in the frequency domain for the effect of timing offset with a timing offset prediction value. Then a timing error estimator calculates a timing error value for the current symbol based on a function of a phase tracking value, a channel response of each pilot subcarrier, transmitted data on each pilot subcarrier, and a timing compensated version of the current symbol on the pilot subcarrier locations. Furthermore, a timing tracking unit receives the timing error value of the current symbol to generate a shift amount of the DFT window and the timing offset prediction value for a next symbol.

摘要翻译： 一种用于多载波系统的鲁棒定时偏移补偿方案。 根据本发明，提供了一种定时偏移补偿器，用于利用定时偏移预测值来补偿频域中的当前符号以用于定时偏移的影响。 然后，定时误差估计器基于相位跟踪值的函数，每个导频子载波的信道响应，每个导频副载波上的发送数据以及当前符号的定时补偿版本，计算当前符号的定时误差值 导频副载波位置。 此外，定时跟踪单元接收当前符号的定时误差值，以产生用于下一个符号的DFT窗口的移位量和定时偏移预测值。