Method and apparatus for reducing peak-to-average requirements in
multi-tone communication circuits
    1.
    发明授权
    Method and apparatus for reducing peak-to-average requirements in multi-tone communication circuits 失效
    用于减少多音通信电路中的峰值与平均要求的方法和装置

    公开(公告)号:US5835536A

    公开(公告)日:1998-11-10

    申请号:US383026

    申请日:1995-02-02

    IPC分类号: H04L27/26 H04L27/34 H04K1/10

    摘要: A symbol generator (804) generates a time-domain discrete multi-tone symbol (810). A magnitude comparator (812) compares the magnitude of the time-domain discrete multi-tone symbol (810) with a magnitude threshold. When the magnitude of the time-domain discrete multi-tone symbol (810) compares unfavorably to the magnitude threshold, a magnitude adjusting symbol (816) is added to the time-domain discrete multi-tone symbol (810) such that the magnitude of the time-domain discrete multi-tone symbol (810) is reduced, thereby reducing the peak-to-average requirements (PAR).

    摘要翻译: 符号生成器(804)生成时域离散多色调符号(810)。 幅度比较器(812)将时域离散多音调符号(810)的幅度与幅度阈值进行比较。 当时域离散多音调符号(810)的大小与幅度阈值不利地比较时,幅度调整符号(816)被加到时域离散多音调符号(810),使得 降低了时域离散多音调符号(810),从而降低了峰值平均要求(PAR)。

    Flexible asymmetrical digital subscriber line ADSL transmitter, remote
terminal using same, and method therefor
    3.
    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

    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。

    Circuit and method for adjusting timing alignment using programmable codes
    5.
    发明授权
    Circuit and method for adjusting timing alignment using programmable codes 有权
    使用可编程代码调整定时对准的电路和方法

    公开(公告)号:US07362840B2

    公开(公告)日:2008-04-22

    申请号:US10990367

    申请日:2004-11-18

    IPC分类号: H04L7/00 H04L25/00 H04L25/40

    CPC分类号: H04B1/7183 H04B1/71632

    摘要: A method is provided for adjusting timing alignment in which a receiver generates a plurality of imbalanced correction codes (1310), and square waves both having the same frequency. The receiver mixes the imbalanced correction codes with the square waves to create a mixed signal (1320), and integrates the mixed signal over a correction code period to generate a signal power value (1330). The receiver adjusts a phase of the square wave in a first direction when the signal power value satisfies a first criterion (1340, 1350), and in a second direction when the signal power value satisfies a second criterion (1340, 1360). Each imbalanced correction code is symmetrical. And a total integrated value of one of the imbalanced correction codes over the correction code period is either above a first threshold, or below a second threshold, the first threshold being greater than or equal to the second threshold.

    摘要翻译: 提供了一种用于调整接收器产生多个不平衡校正码(1310)的定时对准的方法以及具有相同频率的方波。 接收器将不平衡校正码与方波混合以产生混合信号(1320),并且通过校正码周期对混合信号进行积分以产生信号功率值(1330)。 当信号功率值满足第一标准(1340,1350)时,接收器在第一方向上调整方波的相位,并且当信号功率值满足第二标准(1340,1360)时,第二方向调整方波的相位。 每个不平衡校正码是对称的。 并且在校正码周期中不平衡校正码之一的总积分值大于第一阈值或低于第二阈值,第一阈值大于或等于第二阈值。

    Circuit and method for dynamically adjusting a filter bandwidth
    6.
    发明授权
    Circuit and method for dynamically adjusting a filter bandwidth 失效
    用于动态调整滤波器带宽的电路和方法

    公开(公告)号:US07508896B2

    公开(公告)日:2009-03-24

    申请号:US11022883

    申请日:2004-12-28

    IPC分类号: H03D3/24

    摘要: A tracking circuit (100) is provided for controlling a locally-generated clock. A receive channel (110) in the tracking circuit receives an incoming signal and a local clock, generates a local signal based on the local clock, and compares the local signal and the incoming signal to generate a data signal and an unfiltered phase error signal. A loop filter (120) filters the unfiltered phase error signal to provide a filtered phase error signal. A numerically controlled oscillator (140) generates a correction clock based on the filtered phase error signal. And a filter control circuit (160) provides one or more filter control signals to control operational parameters of the loop filter. The correction clock is provided to the receive channel to modify at least one of the phase and frequency of the local clock. In addition, a sample switch (125) may also be provided to sample the unfiltered phase error signal.

    摘要翻译: 提供跟踪电路(100)用于控制本地产生的时钟。 跟踪电路中的接收通道(110)接收输入信号和本地时钟,基于本地时钟产生本地信号,并且比较本地信号和输入信号以产生数据信号和未滤波的相位误差信号。 环路滤波器(120)对未滤波的相位误差信号进行滤波以提供滤波的相位误差信号。 数控振荡器(140)基于滤波的相位误差信号产生校正时钟。 并且滤波器控制电路(160)提供一个或多个滤波器控制信号以控制环路滤波器的操作参数。 校正时钟被提供给接收通道以修改本地时钟的相位和频率中的至少一个。 此外,还可以提供采样开关(125)以对未滤波的相位误差信号进行采样。

    Method and apparatus for equallization in an asymmetric digital
aubscriber line communications system
    7.
    发明授权
    Method and apparatus for equallization in an asymmetric digital aubscriber line communications system 失效
    用于非对称数字订户通信系统中的均衡的方法和装置

    公开(公告)号:US6047025A

    公开(公告)日:2000-04-04

    申请号:US23061

    申请日:1998-02-13

    CPC分类号: H03H21/0012

    摘要: An equalizer (106, 146) for use in systems such as an asymmetric digital subscriber line (ADSL) transceiver (5) reduces the number of calculations required for updating the equalizer coefficients. The equalizer (106, 146) takes advantage of the substantially symmetrical phase and amplitude distortion of the signal constellation, which causes both the amplitude and the phase relationship of the calculated error term for each constellation point to be equal. Instead of performing a full complex multiplication, the equalizer (106, 146) uses some but not all of the product terms between the real and imaginary components of the calculated error term and the conjugate of the received data estimate in the coefficient update calculation. The result is then scaled to account for the missing terms. The resulting equalizer (106, 146) requires fewer calculations for coefficient updating.

    摘要翻译: 用于诸如非对称数字用户线(ADSL)收发器(5)的系统中的均衡器(106,146)减少了更新均衡器系数所需的计算次数。 均衡器(106,146)利用信号星座图的基本对称的相位和幅度失真,这导致每个星座点的计算出的误差项的幅度和相位关系都相等。 代替执行全复数乘法,均衡器(106,146)在系数更新计算中使用计算出的误差项的实部和虚分量之间的一些但不是全部乘积项和接收到的数据估计的共轭。 然后将结果缩小以考虑缺少的术语。 所得到的均衡器(106,146)需要更少的系数更新计算。

    Dual stage automatic gain control in an ultra wideband receiver
    9.
    发明授权
    Dual stage automatic gain control in an ultra wideband receiver 失效
    超宽带接收机的双级自动增益控制

    公开(公告)号:US07532687B2

    公开(公告)日:2009-05-12

    申请号:US11036132

    申请日:2005-01-18

    IPC分类号: H04L27/08

    CPC分类号: H03G3/3078

    摘要: A method (500) and an apparatus (300) are presented for processing a signal in a receiver in accordance with Ultra Wideband (UWB) protocol. The received signal is acquired during a first preamble portion (411) of a data frame associated with the UWB protocol. During acquisition a first Automatic Gain Control (AGC) operation (606) is performed associated with a noise component of the signal. A second AGC operation (608) associated with a pulse component of the signal is performed after the acquiring the signal during a second preamble portion (413).

    摘要翻译: 呈现方法(500)和装置(300),用于根据超宽带(UWB)协议处理接收机中的信号。 在与UWB协议相关联的数据帧的第一前导码部分(411)期间获取所接收的信号。 在采集期间,执行与信号的噪声分量相关联的第一自动增益控制(AGC)操作(606)。 在第二前导码部分(413)中获取信号之后,执行与信号的脉冲分量相关联的第二AGC操作(608)。

    System and method for the mitigation of spectral lines in an ultrawide bandwidth transceiver
    10.
    发明授权
    System and method for the mitigation of spectral lines in an ultrawide bandwidth transceiver 有权
    在超宽带收发器中减轻频谱线路的系统和方法

    公开(公告)号:US07224711B2

    公开(公告)日:2007-05-29

    申请号:US10902021

    申请日:2004-07-30

    IPC分类号: H04B1/69

    CPC分类号: H04B1/71632 H04B1/7174

    摘要: A method and an apparatus are provided for mitigating spectral lines in a wireless signal. First a code word is generated that is made up of a plurality of binary or ternary encoded pulses. Then a plurality of code-word-modulated wavelets are generated in response to the code word. These wavelets can be Gaussian monopulses, repeated cycles of a sine wave, or other shaped impulse signals. The plurality of code-word-modulated wavelets are then modulated with a bit of transmit data to form a plurality of data-modulated wavelets. This modulation serves to whiten the signals since the transmit data is effectively random. Finally, the plurality of data-modulated wavelets are transmitted to a remote device.

    摘要翻译: 提供了一种减轻无线信号中的频谱线的方法和装置。 首先,生成由多个二进制或三进制编码脉冲组成的码字。 然后响应于码字产生多个码字调制小波。 这些小波可以是高斯单脉冲,正弦波的重复周期或其他成形脉冲信号。 然后用一些发送数据调制多个码字调制小波,以形成多个数据调制小波。 该调制用于使信号变白,因为发送数据是有效的随机的。 最后,将多个数据调制小波发送到远程设备。