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1.发明授权Method and apparatus for echo cancellation updates in a multicarrier transceiver system 有权用于多载波收发器系统中的回波消除更新的方法和装置公开(公告)号：US06683859B1
公开(公告)日：2004-01-27
申请号：US09438619
申请日：1999-11-12
IPC分类号： H04B320
CPC分类号： H04B3/23 , H04L27/2626 , H04L27/2647
摘要： An echo canceler (34) includes a summing device (104) that subtracts a correction signal from a received signal, the difference of which represents the far-end signal with an error component. Instead of adapting its coefficients using the output of the summing device (104), the echo canceler (34) uses the difference between the input and output of a decision device (108) as an estimate of the error component alone. The estimate of the error component is then used to adapt the coefficients according to the adaptive least mean squares (LMS) algorithm. In one embodiment, the decision device (108) forms discrete multi-tone symbols based on the equalized output of the summing device. In this embodiment, the echo canceler (34) performs an inverse of the equalization step efficiently by replacing a division operation with a multiply operation and a corresponding power-of-two shift operation.
摘要翻译： 回波消除器（34）包括从接收信号中减去校正信号的求和装置（104），该差值表示具有误差分量的远端信号。 代替使用求和装置（104）的输出来适配其系数，回波消除器（34）使用决策装置（108）的输入和输出之间的差作为单独的误差分量的估计。 然后使用误差分量的估计来根据自适应最小均方（LMS）算法来适应系数。 在一个实施例中，判决设备（108）基于求和设备的均衡输出来形成离散多音调符号。 在本实施例中，回波消除器（34）通过用乘法运算和相应的二次幂移位运算来代替除法运算来有效地执行均衡步骤的逆。
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2.发明授权Method and apparatus for echo cancellation updates in a multicarrier transceiver system 有权用于多载波收发器系统中的回波消除更新的方法和装置公开(公告)号：US06781965B1
公开(公告)日：2004-08-24
申请号：US09543866
申请日：2000-04-05
IPC分类号： H04B320
CPC分类号： H04B3/23 , H04L27/2626 , H04L27/2647
摘要： A simple fast and robust echo canceller for both synchronous and asynchronous multicarrier transceiver systems. A first residual time domain echo component is separated from a receive signal in a first frame and a second residual time domain echo component is separated from a receive signal in the next consecutive frame. The first and second residual time domain echo components from consecutive frames are combined to obtain a combined residual time domain echo component. The combined residual time domain echo component is used to adaptively update coefficients in a transfer function representing an estimate of the echo channel in the multicarrier transceiver system. The separation of the echo components from the receive signal eliminates dependence on the receive signal so that convergence is substantially faster and not signal dependent. Performance of the echo canceller is virtually independent of the receive signal and allows reliable tracking of changes in the echo channel over time.
摘要翻译： 一种用于同步和异步多载波收发器系统的简单快速且可靠的回波消除器。 第一残余时域回波分量与第一帧中的接收信号分离，并且第二剩余时域回波分量与下一连续帧中的接收信号分离。 来自连续帧的第一和第二剩余时域回波分量被组合以获得组合的残余时域回波分量。 组合的残余时域回波分量用于自适应地更新表示多载波收发机系统中的回波信道的估计的传递函数中的系数。 回波分量与接收信号的分离消除了对接收信号的依赖性，使得收敛基本上更快并且不依赖于信号。 回波消除器的性能实际上与接收信号无关，并允许可靠跟踪回波信道随时间的变化。
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3.发明授权Flexible asymmetrical digital subscriber line (ADSL) receiver, central office using same, and method therefor 失效灵活的非对称数字用户线路（ADSL）接收机，中心局使用方法及其方法
公开(公告)号：US5742527A
公开(公告)日：1998-04-21
申请号：US616818
申请日：1996-03-15
申请人： Mathew A. Rybicki , Michael R. May , Matthew A. Pendleton , Terence L. Johnson , Peter R. Molnar
发明人： Mathew A. Rybicki , Michael R. May , Matthew A. Pendleton , Terence L. Johnson , Peter R. Molnar
IPC分类号： H04L25/02 , H04J11/00 , H04L25/03 , H04L27/26 , H04M11/06 , H04Q11/02 , H04Q11/04 , H04L5/20
CPC分类号： H04L27/2649 , H04Q11/0435 , H04Q2213/13034 , H04Q2213/13107 , H04Q2213/1313 , H04Q2213/1319 , H04Q2213/13199 , H04Q2213/13209 , H04Q2213/13376 , H04Q2213/13396
摘要： An ADSL receiver (200) receives an upstream modified ADSL signal and an ISDN signal from a remote terminal (32) on a twisted-pair copper wire (18). An ADSL transmitter (100) of the remote terminal (32) transmits the ADSL signal in a frequency range above an ISDN frequency range so that the ADSL signal does not overlap the frequency range of the ISDN signal. In one embodiment, the ADSL receiver (200) includes a band pass filter (201), an analog-to-digital converter (203), a decimator (205), a fast Fourier transform (210), and a digital signal processor (212). The decimator (205) converts the ADSL signal back to base band, thus allowing an ADSL signal source to simultaneously utilize the telephone line with an ISDN signal source, without significantly reducing ADSL throughput.
摘要翻译： ADSL接收机（200）从双绞铜线（18）上的远程终端（32）接收上游修改的ADSL信号和ISDN信号。 远程终端（32）的ADSL发射机（100）在ISDN频率范围之外的频率范围内发送ADSL信号，使得ADSL信号不与ISDN信号的频率范围重叠。 在一个实施例中，ADSL接收器（200）包括带通滤波器（201），模数转换器（203），抽取器（205），快速傅里叶变换（210）和数字信号处理器 212）。 抽取器（205）将ADSL信号转换回基带，从而允许ADSL信号源同时利用电话线与ISDN信号源，而不显着降低ADSL吞吐量。
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4.发明授权Single-chip software configurable transceiver for asymmetric communication system 失效用于非对称通信系统的单芯片软件可配置收发器
公开(公告)号：US5909463A
公开(公告)日：1999-06-01
申请号：US741634
申请日：1996-11-04
申请人： Terence L. Johnson , Peter R. Molnar , Howard E. Levin , Jeffrey P. Gleason , Robin Wiprud , Sujit Sudhaman , Jody Everett , Michael R. May , Carlos A. Greaves , Mathew A. Rybicki , Matthew A. Pendleton , John M. Porter
发明人： Terence L. Johnson , Peter R. Molnar , Howard E. Levin , Jeffrey P. Gleason , Robin Wiprud , Sujit Sudhaman , Jody Everett , Michael R. May , Carlos A. Greaves , Mathew A. Rybicki , Matthew A. Pendleton , John M. Porter
CPC分类号： H04L5/143 , H04L27/0002 , H04L27/2626 , H04L27/2647 , H04Q2213/13034 , H04Q2213/1305 , H04Q2213/13103 , H04Q2213/1319 , H04Q2213/13199 , H04Q2213/1332
摘要： A transceiver (5) for an asymmetric communication system such as asymmetric digital subscriber line (ADSL) includes a configuration register (71) defining operation at either a central office (CO) or a remote terminal (RT). The configuration register (71) includes a control bit (72) for selecting either CO or RT mode. The transceiver (5) includes a signal processing module (70) configured according to the state of the control bit (72). For example, a digital interface (70) converts transmit data into transmit symbols and converts received symbols into receive data. The digital interface (70) uses a large memory (158) as a buffer in the transmit path and a small memory (160) as a buffer in the receive path in CO mode. In RT mode, the digital interface (70) uses the small memory (160) in the transmit path and the large memory (158) in the receive path. The selective configuration allows a single integrated circuit to be used in both CO and RT equipment.
摘要翻译： 用于诸如非对称数字用户线（ADSL）的非对称通信系统的收发器（5）包括定义在中心局（CO）或远程终端（RT）处的操作的配置寄存器（71）。 配置寄存器（71）包括用于选择CO或RT模式的控制位（72）。 收发器（5）包括根据控制位（72）的状态配置的信号处理模块（70）。 例如，数字接口（70）将发送数据转换为发送符号并将接收到的符号转换为接收数据。 数字接口（70）使用大容量存储器（158）作为发送路径中的缓冲器，并且在CO模式中使用作为接收路径中的缓冲器的小存储器（160）。 在RT模式中，数字接口（70）使用发送路径中的小存储器（160）和接收路径中的大存储器（158）。 选择性配置允许在CO和RT设备中使用单个集成电路。
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5.发明授权Flexible asymmetrical digital subscriber line ADSL transmitter, remote terminal using same, and method therefor 失效灵活的非对称数字用户线ADSL发射机，远程终端使用相同，及其方法
公开(公告)号：US5781728A
公开(公告)日：1998-07-14
申请号：US616819
申请日：1996-03-15
申请人： Mathew A. Rybicki , Michael R. May , Matthew A. Pendleton , Terence L. Johnson , Peter R. Molnar
发明人： Mathew A. Rybicki , Michael R. May , Matthew A. Pendleton , Terence L. Johnson , Peter R. Molnar
CPC分类号： H04Q11/0435 , H04L27/0002 , H04L5/06 , H04Q2213/13034 , H04Q2213/13107 , H04Q2213/1313 , H04Q2213/1319 , H04Q2213/13199 , H04Q2213/13209 , H04Q2213/13376 , H04Q2213/13396
摘要： A flexible asymmetrical digital subscriber line (ADSL) transmitter is able to operate simultaneously with integrated services digital network (ISDN) terminal equipment (TE) using a common telephone line (18). The ADSL transmitter changes the frequency content of a frequency-encoded ADSL signal (104) so that its frequency content does not overlap the frequency content of the ISDN TE signal. A corresponding ADSL receiver located within a central office (CO) adapts to the changed frequency content, allowing the ADSL signal to be transmitted over the telephone line without substantial loss of signal integrity. In one embodiment, an ADSL transmitter (100) converts ADSL symbols making up the frequency-encoded ADSL signal (104) into a corresponding time domain signal. The transmitter (100) then interpolates the time domain signal and high pass filters the interpolated signal. This high pass filtered signal is then converted to analog form, bandpass filtered, and driven onto the telephone line (18).
摘要翻译： 灵活的非对称数字用户线（ADSL）发射机能够使用公用电话线（18）与综合业务数字网（ISDN）终端设备（TE）同时工作。 ADSL发射机改变频率编码ADSL信号（104）的频率内容，使其频率内容不与ISDN TE信号的频率内容重叠。 位于中心局（CO）内的对应的ADSL接收机适应于改变的频率内容，允许ADSL信号通过电话线传输，而不会显着损失信号完整性。 在一个实施例中，ADSL发射机（100）将构成频率编码的ADSL信号（104）的ADSL符号转换成对应的时域信号。 然后，发射机（100）内插时域信号，并对内插信号进行高通滤波。 然后将该高通滤波信号转换为模拟形式，经过滤波，并被驱动到电话线路（18）上。
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6.发明授权Method and apparatus for performing frame synchronization in an asymmetrical digital subscriber line (ADSL) system 失效用于在非对称数字用户线（ADSL）系统中执行帧同步的方法和装置
公开(公告)号：US5995568A
公开(公告)日：1999-11-30
申请号：US740176
申请日：1996-10-28
CPC分类号： H04L27/2675 , H04L27/2656
摘要： A method and apparatus for performing DMT frame synchronization in an ADSL system begins by providing a training signal (82) to a receiver of the ADSL system (34). The training signal (82) is processed to result in a desired impulse response. The impulse response is used to reduce inter-symbol interference between time-adjacent DMT frames (100-108). The desired impulse response is used to calculate a frame misalignment value (.DELTA.T). The frame misalignment value (.DELTA.T) of the desired impulse response (84) is then utilized to adjust an internal counter of the receiver to perform frame alignment. The use of the training signal (82) and impulse response (84) to provide for both intersymbol interference reduction (FIG. 5) and frame synchronization (FIG. 8) provides for fast ADSL initialization.
摘要翻译： 用于在ADSL系统中执行DMT帧同步的方法和装置开始于向ADSL系统（34）的接收机提供训练信号（82）。 训练信号（82）被处理以产生期望的脉冲响应。 脉冲响应用于减少时间相邻的DMT帧之间的符号间干扰（100-108）。 所需的脉冲响应用于计算帧失准值（DELTA T）。 然后利用期望脉冲响应（84）的帧未对准值（DELTA T）来调整接收机的内部计数器以执行帧对齐。 使用训练信号（82）和脉冲响应（84）来提供符号间干扰减少（图5）和帧同步（图8）提供快速ADSL初始化。
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公开(公告)号：US5960036A
公开(公告)日：1999-09-28
申请号：US741635
申请日：1996-11-04
CPC分类号： H04L5/023 , H04L5/143 , H04Q3/54516
摘要： A communications system 10 having an Asymmetric Digital Subscriber Line (ADSL) transceiver (24) is provided which may be configured either as a central office or a remote terminal in a system. The transceiver (24) operates in a listen/report idle state to report line activity to a host processor (22) prior to being configured as a central office or remote terminal. The host processor configures the transceiver (24) as a central office, remote terminal, or as otherwise specified based on the line activity.
摘要翻译： 提供具有非对称数字用户线（ADSL）收发器（24）的通信系统10，其可以被配置为系统中的中心局或远程终端。 收发器（24）在被配置为中心局或远程终端之前，以监听/报告空闲状态操作以将行活动报告给主机处理器（22）。 主机处理器将收发器（24）配置为中心局，远程终端或根据线路活动另有规定。
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8.发明授权Transceiver and method for reporting state transitions in a communication system 失效用于报告通信系统中的状态转换的收发器和方法
公开(公告)号：US5903599A
公开(公告)日：1999-05-11
申请号：US744078
申请日：1996-11-04
申请人： Terence L. Johnson , Jeffrey P. Gleason , Howard E. Levin , Peter R. Molnar , Jean-Louis Dolmeta
发明人： Terence L. Johnson , Jeffrey P. Gleason , Howard E. Levin , Peter R. Molnar , Jean-Louis Dolmeta
CPC分类号： G06F11/3055 , G06F11/3013 , G06F11/302 , G06F11/3024 , G06F11/3636 , H04L29/06 , G06F11/3466
摘要： A host processor (22) in a communication system (10) identifies a level of program visibility for reporting predetermined activation state changes, and signals a communications transceiver (24) to begin an initialization process. The communications transceiver (24) begins executing a series of states (51-55, 61-64) for initializing the communication system (10). A determination is made by the transceiver (24) whether a state change has occurred. A state change is identified and reported to a host processor (22) based on the program visibility select level.
摘要翻译： 通信系统（10）中的主处理器（22）识别用于报告预定的激活状态改变的程序可见度级别，并且通知通信收发器（24）开始初始化处理。 通信收发器（24）开始执行用于初始化通信系统（10）的一系列状态（51-55,61-64）。 由收发器（24）确定是否发生了状态改变。 基于节目可见性选择级别来识别状态改变并将其报告给主机处理器（22）。
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9.发明授权Method and apparatus for data allocation in an overlap-enabled communication system 有权在重叠使能通信系统中进行数据分配的方法和装置公开(公告)号：US07830855B2
公开(公告)日：2010-11-09
申请号：US10958039
申请日：2004-10-04
IPC分类号： H04B7/208
CPC分类号： H04L5/0064 , H04L5/0007 , H04L5/0046 , H04L5/006 , H04L5/06 , H04L5/143
摘要： A communication system is dynamically configured to use some or all of the communication channel bandwidth. Regions of the communication channel are prioritized, and bandwidth is allocated in accordance with priorities and requested data rate.
摘要翻译： 动态配置通信系统以使用部分或全部通信信道带宽。 优先考虑通信信道的区域，并根据优先级和请求的数据速率分配带宽。
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10.发明授权Methods and apparatus for extracting bits of a source register based on a mask and right justifying the bits into a target register 失效用于基于掩码提取源寄存器的位的方法和装置，并将这些位向右对齐到目标寄存器中公开(公告)号：US07685408B2
公开(公告)日：2010-03-23
申请号：US12239920
申请日：2008-09-29
CPC分类号： G06F9/30018 , G06F9/30032 , G06F9/30145
摘要： Techniques for performing a bit rake instruction in a programmable processor. The bit rake instruction extracts an arbitrary pattern of bits from a source register, based on a mask provided in another register, and packs and right justifies the bits into a target register. The bit rake instruction allows any set of bits from the source register to be packed together.
摘要翻译： 在可编程处理器中执行位耙指令的技术。 位耙指令基于另一个寄存器中提供的掩码，从源寄存器中提取任意模式的位，并将这些位组合并将其右对齐到目标寄存器中。 bit rake指令允许来自源寄存器的任何位组合在一起。
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