System and method for reducing the effects of clipping in a DMT transceiver
    51.
    发明授权
    System and method for reducing the effects of clipping in a DMT transceiver 有权
    用于降低DMT收发器中限幅效果的系统和方法

    公开(公告)号:US06584160B1

    公开(公告)日:2003-06-24

    申请号:US09373841

    申请日:1999-08-13

    IPC分类号: H04L2549

    CPC分类号: H04L27/2614 H04L27/2624

    摘要: The present invention is directed to a system and method for reducing the need to perform signal clipping in a DMT transmitter. In accordance with one aspect of the invention, a method performs an inverse Fourier Transform on the input to produce a time-domain, digital value to be transmitted to a remote receiver. The method then evaluates the magnitude of the digital value to determine whether the magnitude exceeds a threshold value. Then, the method alters the input and re-performs an inverse Fourier Transform on the altered input, only if the step of evaluating the magnitude determines that the magnitude of the digital value exceeds the threshold value.

    摘要翻译: 本发明涉及一种用于减少在DMT发射机中执行信号限幅的需要的系统和方法。 根据本发明的一个方面,一种方法在输入端执行逆傅里叶变换,以产生要传输到远程接收机的时域数字值。 该方法然后评估数字值的大小以确定幅度是否超过阈值。 然后,只有当评估幅度的步骤确定数字值的大小超过阈值时,该方法改变输入并对改变的输入重新执行逆傅里叶变换。

    System and method for echo cancellation over asymmetric spectra
    52.
    发明授权
    System and method for echo cancellation over asymmetric spectra 有权
    用于不对称光谱回波消除的系统和方法

    公开(公告)号:US06421377B1

    公开(公告)日:2002-07-16

    申请号:US09164552

    申请日:1998-10-01

    IPC分类号: H04B138

    CPC分类号: H04B3/23 H04L27/2647

    摘要: The present invention generally relates to echo cancellation over an asymmetric transmission and receiving spectra. An apparatus is provided having a transmit path and a receive path, with an adaptive echo canceler disposed therebetween, for communicating data within a first bandwidth and a second bandwidth respectively. A first decimator is disposed between the transmit path and the echo canceler circuit and filters an incoming signal having a first sampling rate and emits a signal output at a second, reduced sampling rate. A second decimator is disposed along said receive path and filters an incoming signal and emits a signal output at a reduced sampling rate. An adder is disposed to subtract the output of the adaptive echo canceler from output of the second decimator to generate a received signal that is substantially free of echo.

    摘要翻译: 本发明一般涉及不对称传输和接收光谱的回波消除。 提供一种具有发送路径和接收路径的装置,其间设置有自适应回波消除器,用于分别在第一带宽和第二带宽内传送数据。 第一抽取器设置在发射路径和回波抵消器电路之间,并且对具有第一采样率的输入信号进行滤波,并以第二次降低的采样率发射信号输出。 沿着所述接收路径设置第二抽取器,并且对输入信号进行滤波并以降低的采样率发射信号输出。 设置加法器以从第二抽取器的输出中减去自适应回波消除器的输出,以产生基本上没有回波的接收信号。

    Method for processing speech signals as block floating point numbers in
a CELP-based coder using a fixed point processor
    53.
    发明授权
    Method for processing speech signals as block floating point numbers in a CELP-based coder using a fixed point processor 失效
    在基于CELP的编码器中使用固定点处理器处理语音信号作为块浮点数的方法

    公开(公告)号:US5570454A

    公开(公告)日:1996-10-29

    申请号:US257831

    申请日:1994-06-09

    申请人: Weimin Liu

    发明人: Weimin Liu

    CPC分类号: G10L19/125

    摘要: A method of encoding speech using a fixed-point processor. The method treats the signal as floating point, while operating on each sample of the signal as fixed point. The disclosed method achieves precision similar to that of conventional floating point and may be rapidly executed on a fixed point processor.

    摘要翻译: 一种使用定点处理器对语音进行编码的方法。 该方法将信号视为浮点,同时以信号的每个样本作为固定点进行操作。 所公开的方法实现与常规浮点类似的精度,并且可以在固定点处理器上快速执行。

    Physical layer network coding using forward error correction codes
    55.
    发明授权
    Physical layer network coding using forward error correction codes 有权
    使用前向纠错码的物理层网络编码

    公开(公告)号:US09088351B2

    公开(公告)日:2015-07-21

    申请号:US14005730

    申请日:2012-03-16

    摘要: Two network nodes may exchange messages through a relay using physical-layer network coding combined with forward error correction coding (FEC). The relay determines a prime field order based on the channel condition and communicates the field order to the network nodes. Each network node encodes an outgoing message with linear codes over a field such as finite field of the field order, and transmits a signal carrying the encoded outgoing message. The relay receives a composite signal carrying the summation of the messages from the two network nodes. The relay decodes the composite signal and extracts a composite message with linear codes over finite field of field order, and broadcasts a signal carrying the composite message. Each network node receives the signal from the relay and extracts the message intended for it using linear subtraction over finite field of field order.

    摘要翻译: 两个网络节点可以使用结合前向纠错编码(FEC)的物理层网络编码通过中继交换消息。 继电器基于信道条件确定主场顺序,并将该场顺序传送到网络节点。 每个网络节点通过诸如场顺序的有限域的字段编码具有线性码的输出消息,并且发送携带编码的输出消息的信号。 继电器接收携带来自两个网络节点的消息总和的复合信号。 中继解码复合信号,并通过有限场场顺序提取具有线性码的复合消息,并广播携带复合消息的信号。 每个网络节点接收来自中继器的信号,并通过有限场域顺序使用线性减法提取预期的消息。

    Method and apparatus for a two-way relaying scheme with physical layer network coding
    56.
    发明授权
    Method and apparatus for a two-way relaying scheme with physical layer network coding 有权
    用于具有物理层网络编码的双向中继方案的方法和装置

    公开(公告)号:US08908624B2

    公开(公告)日:2014-12-09

    申请号:US13503258

    申请日:2010-10-22

    摘要: A two-way relay wireless communication method and device may combine multiple bit steams, for one source node and two target nodes, and broadcasting a network coded combined bit sequence to reduce the number of time slots for transmission. A first device may receive a signal from the source node and a target node simultaneously in a time slot. The first device may receive subsequent signals from the source node and multiple target nodes simultaneously in successive time slots. Hierarchical modulation may be applied to the received signals. The first device may decode the received signals and generate a plurality of intermediate bit sequences (IBS)s for a broadcast transmission. The generated IBSs may be grouped according to a channel condition. A second device may be configured to receive the broadcast transmission and decode a portion of the broadcast transmission that is intended for the second device.

    摘要翻译: 双向中继无线通信方法和装置可以对一个源节点和两个目标节点组合多个比特流,并且广播网络编码的组合比特序列以减少用于传输的时隙数量。 第一设备可以在时隙中同时从源节点和目标节点接收信号。 第一设备可以在连续的时隙中同时从源节点和多个目标节点接收后续信号。 可以对接收的信号应用分层调制。 第一设备可以对接收的信号进行解码,并生成用于广播传输的多个中间比特序列(IBS)。 所生成的IBS可以根据信道条件进行分组。 第二设备可以被配置为接收广播传输并解码旨在用于第二设备的广播传输的一部分。

    HRPD network access authentication method based on CAVE algorithm
    60.
    发明授权
    HRPD network access authentication method based on CAVE algorithm 有权
    基于CAVE算法的HRPD网络访问认证方法

    公开(公告)号:US07630345B2

    公开(公告)日:2009-12-08

    申请号:US10949567

    申请日:2004-09-24

    申请人: Weimin Liu

    发明人: Weimin Liu

    IPC分类号: H04B7/216

    摘要: A HRPD network access authentication method based on CAVE algorithm is proposed. An AT generates a random number “RAND” necessary for the calculation of AUTH1 by using the “Random text” included in the CHAP Challenge message. A UIM card works out the AUTH1 by using the random number “RAND” and the SSD_A in the UIM card. The AT carries the AUTH1 by the Result field of the CHAP Response message. The AN-AAA generates the random number “RAND” necessary for the calculation of AUTH2 by using the “Random text” included in the Radius Access Request message. The AN-AAA works out the AUTH2 by using the random number “RAND”. The two results AUTH1 and AUTH2 is compared. If they are just the same, the authentication on the AT passes. Otherwise, the AT is rejected to access.

    摘要翻译: 提出了基于CAVE算法的HRPD网络访问认证方法。 AT通过使用CHAP挑战消息中包含的“随机文本”生成AUTH1计算所需的随机数“RAND”。 UIM卡通过使用UIM卡中的随机数“RAND”和SSD_A来处理AUTH1。 AT根据CHAP响应消息的结果字段携带AUTH1。 AN-AAA通过使用包含在Radius访问请求消息中的“随机文本”生成AUTH2计算所需的随机数“RAND”。 AN-AAA通过使用随机数“RAND”来编写AUTH2。 比较两个结果AUTH1和AUTH2。 如果它们相同,AT上的认证通过。 否则,AT被拒绝访问。