专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US06501405B1 Method and apparatus for digital to analog conversion with distortion calibration 有权
标题翻译：用于具有失真校准的数模转换的方法和装置
公开(公告)号：US06501405B1
公开(公告)日：2002-12-31
申请号：US09881857
申请日：2001-06-13
申请人： John Zhongxuan Zhang , Peter Gunadisastra , Dale Smith , Mong Yang , Ali Al-Shamma
发明人： John Zhongxuan Zhang , Peter Gunadisastra , Dale Smith , Mong Yang , Ali Al-Shamma
IPC分类号： H03M300
CPC分类号： H03M3/388 , H03M3/50
摘要： An apparatus and method is disclosed for minimizing in band distortion in the transmit path of an XDSL modem. The transmit path of an XDSL modem introduces various non-linearities into transmissions in both the frequency and time domains. The current invention provides a means for both determining and correcting for distortion in the time domain. In an embodiment of the invention the apparatus may include a calibrator which may be implemented using the existing analog-to-digital (ADC) conversion and demodulation capabilities on the receive path of the modem or alternately, a dedicated module. During a calibration phase a training signal is injected digitally into the digital-to-analog converter of the transmit path. The analog portion of the transmit path is coupled to a calibrator which measures the corresponding analog response. The correlation between input and response is stored in an analog model. During subsequent training and run-time phases of modem operation an oversampled digital input stream is subject to digital Delta Sigma Modulation (&Dgr;&Sgr;M) with the analog model injected into the feedback path from the quantizer. The injection of the analog model into the feedback improves the noise transfer function (NTF) associated with the &Dgr;&Sgr;M.
摘要翻译：公开了一种用于使XDSL调制解调器的发送路径中的频带失真最小化的装置和方法。 XDSL调制解调器的发送路径将各种非线性性引入频域和时域中的传输。本发明提供了用于确定和校正时域中的失真的装置。在本发明的实施例中，该装置可以包括校准器，其可以使用调制解调器的接收路径上的现有模数（ADC）转换和解调能力或者替代地专用模块来实现。在校准阶段期间，训练信号被数字地注入到发射路径的数模转换器中。发射路径的模拟部分耦合到测量对应的模拟响应的校准器。输入和响应之间的相关性存储在模拟模型中。在调制解调器操作的后续训练和运行阶段，过采样的数字输入流经数字Delta Sigma调制（DELTASIGMAM），模拟量模拟从量化器注入反馈路径。将模拟模型注入到反馈中改进了与DELTASIGMAM相关联的噪声传递函数（NTF）。

2. 发明授权

US06466088B1 Method and apparatus for multi-channel X-DSL line driver 有权
标题翻译：多通道X-DSL线路驱动器的方法和装置
公开(公告)号：US06466088B1
公开(公告)日：2002-10-15
申请号：US09779254
申请日：2001-02-07
申请人： Behrooz Rezvani , John Zhongxuan Zhang , Dale Smith , Caesar Seehoi Wong
发明人： Behrooz Rezvani , John Zhongxuan Zhang , Dale Smith , Caesar Seehoi Wong
IPC分类号： H03F114
CPC分类号： H04L12/10
摘要： An apparatus and method for reducing power requirements in X-DSL and other communication protocols is disclosed. The apparatus may be applied with equal advantage in wired and wireless media Power is supplied selectively to input lines in which input signals exceed selected threshold levels. The apparatus is configured to support statistical multiplexing of the input signal lines across a plurality of amplification means which support amplification at up to either of at least two power levels. This reduces overall power requirements for the combined input lines. In an embodiment of the invention an apparatus for providing amplification of input signals on corresponding ones of a plurality of input signal lines is disclosed. The apparatus includes primary amplifiers and at least one secondary amplifier with higher output levels than the primary amplifier which can be statistical multiplexed to whichever of the input signal lines requires additional amplification. In an alternate embodiment of the invention each input signal line is coupled to a corresponding amplifier which can be statistically multiplexed to a power supplies of varying output levels depending on the amplification requirements of each of the input signal lines.
摘要翻译：公开了一种用于降低X-DSL和其他通信协议中的功率需求的装置和方法。该装置可以在有线和无线媒体中具有相同的优点。电力被选择性地提供给其中输入信号超过所选择的阈值电平的输入线路。该装置被配置为支持跨越多个放大装置的输入信号线的统计复用，该多个放大装置支持至多两个功率电平中的任一个的放大。这降低了组合输入线的总体功耗要求。在本发明的实施例中，公开了一种用于在多个输入信号线中的相应输入信号线上提供输入信号的放大的装置。该装置包括主放大器和至少一个次级放大器，其具有比主放大器更高的输出电平，其可以被统计多路复用到任何一个输入信号线需要额外的放大。在本发明的替代实施例中，每个输入信号线耦合到对应的放大器，其可以根据每个输入信号线的放大要求而被统计地复用到变化的输出电平的电源。

3. 发明授权

US09042831B2 Wireless transmission method and associated system 有权
标题翻译：无线传输方式及相关系统
公开(公告)号：US09042831B2
公开(公告)日：2015-05-26
申请号：US13236988
申请日：2011-09-20
申请人： John Zhongxuan Zhang , Chih-Cheng Ku
发明人： John Zhongxuan Zhang , Chih-Cheng Ku
IPC分类号： H04B15/00 , H04B17/00 , H04W72/08 , H04W76/02
CPC分类号： H04W72/082 , H04W76/14
摘要： A method of wireless transmission applicable to transmission between a first communication terminal and a second transmission terminal is provided. The first communication terminal transmits data via a first channel selected as a primary transmission channel. The transmission quality of the primary transmission channel is detected. When it is determined that the quality of the primary transmission channel degrades, a third channel replaces the first channel as the primary transmission channel, and a replacement request is sent from the first communication terminal via a second channel. The first communication channel then transmits data via the third channel as the primary transmission channel.
摘要翻译：提供适用于第一通信终端和第二传输终端之间的传输的无线传输方法。第一通信终端经由被选择为主要传输信道的第一信道发送数据。检测主传输信道的传输质量。当确定主传输信道的质量下降时，第三信道替换作为主要传输信道的第一信道，并且经由第二信道从第一通信终端发送替换请求。第一通信信道然后经由第三信道发送数据作为主要传输信道。

4. 发明申请

US20130005268A1 Wireless Transmission Method and Associated System 有权
标题翻译：无线传输方法及相关系统
公开(公告)号：US20130005268A1
公开(公告)日：2013-01-03
申请号：US13236988
申请日：2011-09-20
申请人： John Zhongxuan Zhang , Chih-Cheng Ku
发明人： John Zhongxuan Zhang , Chih-Cheng Ku
IPC分类号： H04B15/00
CPC分类号： H04W72/082 , H04W76/14
摘要： A method of wireless transmission applicable to transmission between a first communication terminal and a second transmission terminal is provided. The first communication terminal transmits data via a first channel selected as a primary transmission channel. The transmission quality of the primary transmission channel is detected. When it is determined that the quality of the primary transmission channel degrades, a third channel replaces the first channel as the primary transmission channel, and a replacement request is sent from the first communication terminal via a second channel. The first communication channel then transmits data via the third channel as the primary transmission channel.
摘要翻译：提供适用于第一通信终端和第二传输终端之间的传输的无线传输方法。第一通信终端经由被选择为主要传输信道的第一信道发送数据。检测主传输信道的传输质量。当确定主传输信道的质量下降时，第三信道替换作为主要传输信道的第一信道，并且经由第二信道从第一通信终端发送替换请求。第一通信信道然后经由第三信道发送数据作为主要传输信道。

5. 发明授权

US06873653B1 Method and apparatus for pre-distortion of an X-DSL line driver 有权
标题翻译：用于X-DSL线路驱动器预失真的方法和装置
公开(公告)号：US06873653B1
公开(公告)日：2005-03-29
申请号：US09779256
申请日：2001-02-07
申请人： Behrooz Rezvani , Sam Heidari , John Zhongxuan Zhang , Dale Smith
发明人： Behrooz Rezvani , Sam Heidari , John Zhongxuan Zhang , Dale Smith
IPC分类号： H04L5/16 , H04L27/26
CPC分类号： H04L5/16 , H04L27/2601
摘要： An apparatus and method is provided for minimizing in channel distortion in an X-DSL line driver is disclosed. The apparatus may be incorporated in an existing X-DSL architecture without additional circuitry. Out of band monitoring of a channel is implemented to adaptively minimize out of band interference and in band distortion. A unique training sequence, suitable for DMT line codes is set forth. The training sequence allows a full spectral characterization of the downstream signal space with a single upstream monitoring tone. The invention may be used with multi-channel X-DSL line drivers interfacing with any of a number of multi-channel supply architectures. The apparatus may be applied with equal advantage to communication protocols other than X-DSL. The apparatus may be applied with equal advantage in wired and wireless media.
摘要翻译：提供了一种用于最小化X-DSL线路驱动器中的信道失真的装置和方法。该装置可以并入现有的X-DSL架构中，而不需要附加的电路。实现频带的带外监视以自适应地最小化带外干扰和带内失真。阐述了适用于DMT线路码的唯一训练序列。训练序列允许使用单个上游监控音调对下游信号空间的全频谱表征。本发明可以与与多个多信道供应架构中的任何一个接口的多信道X-DSL线路驱动器一起使用。该装置可以与除了X-DSL之外的通信协议相同的优点。该装置可以在有线和无线介质中具有相同的优点。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式