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21. 发明授权

US08170064B2 Method and apparatus for orthogonal frequency division multiplexing communication 有权
标题翻译：用于正交频分复用通信的方法和装置
公开(公告)号：US08170064B2
公开(公告)日：2012-05-01
申请号：US11739803
申请日：2007-04-25
申请人： Pil-soon Choi , Ji-sung Oh
发明人： Pil-soon Choi , Ji-sung Oh
IPC分类号： H04J1/00
CPC分类号： H04L27/2602 , H04L1/06 , H04L27/0006 , H04W72/0453 , H04W72/082
摘要： A method and apparatus for transmitting and receiving a digital signal using an orthogonal frequency division multiplexing (OFDM) communication system are provided. In this method, subcarriers are split into a plurality of subcarrier groups according to available frequency bandwidths and are respectively transmitted in a transmitting portion and the subcarrier groups are combined and are restored to the original signal in a receiving portion. Therefore, wireless resources may be used efficiently by combining with cognitive radio technology.
摘要翻译：提供了一种使用正交频分复用（OFDM）通信系统发送和接收数字信号的方法和装置。在该方法中，根据可用的频带宽度将子载波分割为多个子载波组，并且在发送部分中分别发送子载波组，并在接收部分恢复为原始信号。因此，可以通过结合认知无线电技术有效地使用无线资源。

22. 发明授权

US06842488B2 VSB/QAM receiver and method 失效
标题翻译： VSB / QAM接收机和方法
公开(公告)号：US06842488B2
公开(公告)日：2005-01-11
申请号：US09794159
申请日：2001-02-28
申请人： Ji-sung Oh
发明人： Ji-sung Oh
IPC分类号： H04L27/02 , H04L27/00 , H04L27/06 , H04L27/22 , H04L27/38 , H04L23/02
CPC分类号： H04L27/0008 , H04L27/066 , H04L27/3854 , H04L2027/0036 , H04L2027/0055 , H04L2027/0087
摘要： A vestigial sideband/quadrature amplitude modulation (VSB/QAM) receiver, which receives both VSB and QAM signals and restores a carrier wave with a restored symbol clock after restoring a symbol timing in a front portion of a carrier wave restoration unit. The receiver has an analog-digital converter for A/D converting in accordance with a frequency higher than a symbol frequency of a received signal; an interpolator for calculating a signal value on the original symbol location after a signal from the A/D converter is applied; the carrier wave restoration unit for restoring a carrier wave by selectively using an automatic frequency control (AFC) and a digital frequency phase locked loop (DFPLL) in accordance with a VSB/QAM mode after a signal from the interpolator is applied; a timing processor for receiving a signal from the carrier wave restoration unit, detecting a timing error after changing a symbol input time in accordance with a VSB/QAM mode, controlling the interpolator based on the detected timing error, and generating a restored clock; and a VSB sorter for extracting a VSB receiving symbol.
摘要翻译：一种残留边带/正交幅度调制（VSB / QAM）接收机，其在恢复载波恢复单元的前部中的符号定时之后接收VSB和QAM信号并恢复具有恢复的符号时钟的载波。接收器具有用于根据接收信号的符号频率高的频率进行A / D转换的模数转换器; 用于在应用来自A / D转换器的信号之后计算原始符号位置上的信号值的内插器; 载波恢复单元，用于在应用来自内插器的信号之后，通过选择性地使用根据VSB / QAM模式的自动频率控制（AFC）和数字频率锁相环（DFPLL）来恢复载波; 定时处理器，用于从载波恢复单元接收信号，根据VSB / QAM模式检测符号输入时间改变后的定时误差，根据检测到的定时误差控制内插器，并产生恢复时钟; 以及用于提取VSB接收符号的VSB分类器。

23. 发明授权

US06633606B1 Blind channel equalizer 失效
标题翻译：盲通道均衡器
公开(公告)号：US06633606B1
公开(公告)日：2003-10-14
申请号：US09449616
申请日：1999-11-30
申请人： Ji-sung Oh
发明人： Ji-sung Oh
IPC分类号： H03H730
CPC分类号： H04L25/0305 , H04L2025/03382
摘要： A blind channel equalizer for deciding a blind coefficient of a channel equalizer for use in a digital television signal processor. The blind channel equalizer in a vestigial sideband (VSB) receiving system includes a comparator for determining a boundary level value according to the distribution of occurrence probabilities of VSB symbol levels and comparing the determined boundary level value with a received symbol, a blind decision coefficient allocator for allocating one of three blind coefficients according to an output result of the comparator, and a subtracter for performing subtraction with respect to the received symbol and an output of the blind decision coefficient allocator to provide a blind error. Inverse transformation is not necessary during the blind channel equalization, thereby simplifying the hardware structure. In addition, National Television System Committee (NTSC) interference signals can be prevented so that the performance of channel equalization can be improved.
摘要翻译：盲信道均衡器，用于决定在数字电视信号处理器中使用的信道均衡器的盲系数。残留边带（VSB）接收系统中的盲信道均衡器包括：比较器，用于根据VSB符号级别的出现概率的分布确定边界级别的值，并将所确定的边界级别值与接收到的符号进行比较;盲判决系数分配器用于根据比较器的输出结果分配三个盲系数中的一个，以及用于对接收到的符号进行减法的减法器和盲判决系数分配器的输出以提供盲目错误。在盲信道均衡期间不需要逆变换，从而简化硬件结构。此外，可以防止国家电视系统委员会（NTSC）干扰信号，从而可以提高信道均衡性能。

24. 发明授权

US06226049B1 NTSC rejection filter 失效
标题翻译： NTSC抑制滤波器
公开(公告)号：US06226049B1
公开(公告)日：2001-05-01
申请号：US08961804
申请日：1997-10-31
申请人： Ji-sung Oh
发明人： Ji-sung Oh
IPC分类号： H04N521
CPC分类号： H04N5/21
摘要： A receiver including an NTSC rejection filter for eliminating interference signals from a high definition signal. The ratio of the energy of an expected high definition signal to the energy of an NTSC signal is determined. An NTSC signal sequence is generated according to the determined ratio. The number of filter taps is determined, and an autocorrelation matrix of the NTSC signal is calculated using the generated NTSC signal sequence. The power of all interference noise in the output of the NTSC rejection filter is used as a cost function, with respect to the input NTSC interference signal, the additive Gaussian noise and the VSB signal. A filter coefficient equation, for minimizing the cost function, is obtained by differentiation, and then the autocorrelation matrix is substituted for the equation, to calculate coefficients of the NTSC rejection filter.
摘要翻译：一种接收机，包括用于消除来自高分辨率信号的干扰信号的NTSC抑制滤波器。确定期望的高清晰度信号的能量与NTSC信号的能量的比率。根据确定的比例生成NTSC信号序列。确定滤波器抽头的数量，并且使用所生成的NTSC信号序列来计算NTSC信号的自相关矩阵。对于输入NTSC干扰信号，加性高斯噪声和VSB信号，将NTSC抑制滤波器的输出中的所有干扰噪声的功率用作成本函数。通过微分获得最小化成本函数的滤波器系数方程，然后用自相关矩阵代入方程式，计算NTSC抑制滤波器的系数。

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