公开(公告)号：US06512797B1

公开(公告)日：2003-01-28

申请号：US09081493

申请日：1998-05-19

申请人： Jose Tellado ,  John M. Cioffi

发明人： Jose Tellado ,  John M. Cioffi

IPC分类号： H04L512

CPC分类号： H04L27/2602 ,  H04L27/2614 ,  H04L27/2626 ,  H04L27/2647

摘要： The present inventions provide methods and systems for reducing the peak to average power ratio of a multi-carrier signal. Reducing the peak to average power ratio of a signal ensures that amplifiers and transmitters are not saturated, causing loss of data. Further, reducing peak to average power ratios reduces the consumption of power during transmission. Peak to average power ratios are reduced by applying a peak reduction signal component to one or more of the plurality of information signals that make up the multi-carrier signal. In one embodiment the peak reduction signal is a basis function of the communication system. The information signal is mapped to duplicate constellation points, which may be easily decoded by a receiver by performing a modulo operation. Negation of the peaks may be performed iteratively to remove any peaks produced during prior peak reduction operations.

摘要翻译： 本发明提供了用于降低多载波信号的峰均功率比的方法和系统。 降低信号的峰值与平均功率比确保放大器和发射器不饱和，造成数据丢失。 此外，降低峰值与平均功率比降低了传输期间的功率消耗。 通过将峰值降低信号分量应用于构成多载波信号的多个信息信号中的一个或多个来降低峰值与平均功率比。 在一个实施例中，峰值降低信号是通信系统的基础功能。 信息信号被映射到重复的星座点，其可以由接收机容易地通过执行模运算来解码。 可以迭代地执行峰的否定以去除在先前的峰值降低操作期间产生的任何峰。

公开(公告)号：US06473438B1

公开(公告)日：2002-10-29

申请号：US08913210

申请日：1997-10-22

申请人： John M. Cioffi ,  John Bingham ,  Krista S. Jacobsen

发明人： John M. Cioffi ,  John Bingham ,  Krista S. Jacobsen

IPC分类号： H04J102

CPC分类号： H04L1/0025 ,  H04L1/206 ,  H04L5/0007 ,  H04L5/0037 ,  H04L5/0048 ,  H04L5/0064 ,  H04L5/0091 ,  H04L5/023 ,  H04L27/2601 ,  H04L27/2608 ,  H04L2001/0093

摘要： A variety of bi-directional data transmission systems that facilitate communications between a plurality of remote units (15) and a central unit (10) using a frame based discrete multi-carrier transmission scheme are disclosed. In each of the systems, frames transmitted from the plurality of remote units (15) are synchronized at the central unit (10). A variety of novel modem arrangements and methods for coordinating communications between a plurality of remote units (15) and a central unit (10) to facilitate multi-point-to-point transmission are disclosed. The invention has application in a wide variety of data transmission schemes including Asymmetric Digital Subscriber Line systems that includes the transmission of signals over twisted pair, fiber and/or hybrid telephone lines, cable systems that includes the transmission of signals over a coaxial cable, and digital cellular television systems that include the transmission of radio signals.

摘要翻译： 公开了使用基于帧的离散多载波传输方案来促进多个远程单元（15）和中央单元（10）之间的通信的各种双向数据传输系统。 在每个系统中，从多个远程单元（15）发送的帧在中央单元（10）处同步。 公开了用于协调多个远程单元（15）和中央单元（10）之间的通信以便于多点到点传输的各种新颖的调制解调器布置和方法。 本发明可应用于各种各样的数据传输方案，包括非对称数字用户线路系统，其包括通过双绞线，光纤和/或混合电话线路传输信号，包括通过同轴电缆传输信号的电缆系统，以及 包括无线电信号传输的数字蜂窝电视系统。

公开(公告)号：US5995567A

公开(公告)日：1999-11-30

申请号：US835073

申请日：1997-04-04

申请人： John M. Cioffi ,  Mark P. Mallory ,  John A. C. Bingham

发明人： John M. Cioffi ,  Mark P. Mallory ,  John A. C. Bingham

IPC分类号： H04B3/06 ,  H04B1/10 ,  H04B1/12 ,  H04B3/32 ,  H04B15/00 ,  H04J11/00 ,  H04L5/14 ,  H04L27/26 ,  H04M3/00 ,  G09B3/00

CPC分类号： H04B1/123 ,  H04B1/126 ,  H04L27/2647

摘要： A receiver or receiver system for high speed data communications having a radio frequency noise canceller is disclosed. The radio frequency noise canceller removes radio-frequency noise from received signals over a transmission medium by adaptively estimating the radio-frequency noise during data transmission. In one embodiment, the radio frequency noise canceller includes: an adaptive filter for producing a noise cancellation signal by filtering a reference noise signal based on filter parameters, a subtractor for subtracting the noise cancellation signal from the first signal to produce the second signal; and an update circuit for enabling, at predetermined times, modification of the parameters of the adaptive filter based on the then existing second signal. A method for removing radio frequency noise is also disclosed.

摘要翻译： 公开了一种用于具有射频噪声消除器的高速数据通信的接收机或接收机系统。 无线电频率噪声消除器通过在数据传输期间自适应地估计射频噪声来消除传输介质上的接收信号的射频噪声。 在一个实施例中，射频噪声消除器包括：自适应滤波器，用于通过基于滤波器参数对参考噪声信号进行滤波来产生噪声消除信号;减法器，用于从第一信号中减去噪声消除信号以产生第二信号; 以及更新电路，用于在预定时间基于当时存在的第二信号来修改自适应滤波器的参数。 还公开了一种用于消除射频噪声的方法。

公开(公告)号：US5774500A

公开(公告)日：1998-06-30

申请号：US569759

申请日：1995-12-08

申请人： T. Nicholas Zogakis ,  John M. Cioffi

发明人： T. Nicholas Zogakis ,  John M. Cioffi

IPC分类号： H03M13/25 ,  H03M13/35 ,  H04L1/00 ,  H04L27/26 ,  H04L27/34

CPC分类号： H04L1/0057 ,  H03M13/25 ,  H03M13/256 ,  H03M13/35 ,  H03M13/3961 ,  H04L1/006 ,  H04L1/0071 ,  H04L27/2602

摘要： A trellis shaper for multi-channel modulation is provided as a means for obtaining significant shaping gain in applications requiring high-performance transceivers. The trellis shaper works across the subchannels in the multi-channel system and accommodates both the variable amounts of power and the different constellation sizes associated with the various tones. This invention offers significant advantage over the more straightforward approach of shaping each subchannel independently in terms of a reduction in delay, a reduction in memory requirements, and a reduction in complexity.

摘要翻译： 提供用于多信道调制的网格整形器作为在需要高性能收发器的应用中获得显着成形增益的手段。 网格整形器跨多通道系统中的子通道工作，并且适应可变量的功率和与各种音调相关联的不同星座尺寸。 与减少延迟，减少存储器需求以及降低复杂度方面相比，本发明提供了独立地对每个子通道进行整形的更直接的方法的显着优点。

公开(公告)号：US5285474A

公开(公告)日：1994-02-08

申请号：US898104

申请日：1992-06-12

申请人： Jacky Chow ,  John M. Cioffi

发明人： Jacky Chow ,  John M. Cioffi

IPC分类号： H04L27/01 ,  H04L27/26 ,  H04B1/38 ,  H03H7/30 ,  H03H7/40 ,  H04L5/16

CPC分类号： H04L27/01 ,  H04L27/2647

摘要： A method for optimizing a set of equalizer parameters of an equalizer to be used to equalize a multicarrier data signal that has been transmitted through a distorting channel, comprised of the steps of initializing the parameters, repeatedly sending a training sequence through the channel to the receiver, using the equalizer parameters, the received sequence, and a local replica of the training sequence to update a set of channel target response parameters, windowing the channel target response parameters, using the channel target response parameters, the received sequence and the local replica to update the equalizer parameters, and windowing the equalizer parameters. This training process is repeated until a predetermined convergence condition is detected.

摘要翻译： 一种用于优化均衡器的一组均衡器参数的方法，用于均衡已经通过失真信道发送的多载波数据信号，包括初始化参数的步骤，通过信道重复发送训练序列到接收机 使用所述均衡器参数，所述接收序列和所述训练序列的本地副本来更新一组信道目标响应参数，使用所述信道目标响应参数，所述接收序列和所述本地副本对所述信道目标响应参数进行加窗 更新均衡器参数，并加窗均衡器参数。 重复该训练处理直到检测到预定的收敛条件。