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。

    Method for allocating data and power in a discrete, multi-tone communication system
    4.
    发明授权
    Method for allocating data and power in a discrete, multi-tone communication system 失效
    用于在离散的多音通信系统中分配数据和功率的方法

    公开(公告)号:US06275522B1

    公开(公告)日:2001-08-14

    申请号:US09007390

    申请日:1998-01-14

    IPC分类号: H04B346

    CPC分类号: H04L27/2608

    摘要: In the present invention, an ADSL system (10) identifies good bin as a bin capable of successfully transmitting data to a destination. A bad bin is identified as a carrier that is not capable of successfully transmitting data to the destination. A marginal bin is identified as a carrier that may be capable of transmitting data to the destination. The power to a bad bin is reduced and allocated to the marginal or good bin(s) to allow an increased bit rate. In another embodiment, the power to marginal bin is reduced and allocated to the good bin(s).

    摘要翻译: 在本发明中,ADSL系统(10)识别出能够成功地将数据发送到目的地的bin的好的bin。 一个坏的垃圾箱被识别为不能成功传送数据到目的地的载体。 边缘垃圾箱被识别为可以向目的地发送数据的载体。 减少对坏垃圾箱的电力并将其分配给边缘或好的仓,以允许增加的比特率。 在另一个实施例中,边缘垃圾箱的功率被减少并分配给好的垃圾箱。

    Method for allocating data and power in a discrete multi-tone communication system
    5.
    发明授权
    Method for allocating data and power in a discrete multi-tone communication system 失效
    在离散多音通信系统中分配数据和功率的方法

    公开(公告)号:US06259746B1

    公开(公告)日:2001-07-10

    申请号:US09007218

    申请日:1998-01-14

    IPC分类号: H04L2704

    CPC分类号: H04L27/2608

    摘要: In the present invention, carriers associated with a discrete multi-tone (DMT) communications system (10) are sorted according to bit allocation capacity. The number of bits needed to attain a specified bit rate are then allocated beginning with the carrier having the greatest bit allocation capacity and proceeding toward the carrier having the least bit allocation capacity until all bits to are allocated. Once allocated, the power to any unused bins is reduced. Different subsets of the carriers between line cards can be specified in order to reduce crosstalk between adjacent lines.

    摘要翻译: 在本发明中,根据比特分配容量对与离散多音(DMT)通信系统(10)相关联的载波进行分类。 然后从具有最大位分配容量的载波开始分配达到指定比特率所需的比特数,并且朝向具有最小比特分配容量的载波进行分配,直到所有比特被分配为止。 一旦分配,任何未使用的箱的功率就会降低。 可以指定线路卡之间的载波的不同子集,以减少相邻线路之间的串扰。

    Method and apparatus for reducing peak-to-average requirements in
multi-tone communication circuits
    6.
    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)。

    Method and apparatus for synchronized channel transmission
    8.
    发明授权
    Method and apparatus for synchronized channel transmission 有权
    用于同步信道传输的方法和装置

    公开(公告)号:US07961759B2

    公开(公告)日:2011-06-14

    申请号:US10376806

    申请日:2003-02-28

    IPC分类号: H04J3/06

    摘要: A method and apparatus for synchronized channel transmission are disclosed. One embodiment of the method comprises: generating a first data stream and a second data stream; packetizing the first data stream to produce a first plurality of data packets; packetizing the second data stream to produce a second plurality of data packets; baseband processing the first plurality of data packets to produce a first plurality of symbols for each of the first plurality of data packets; baseband processing the second plurality of data packets to produce a second plurality of symbols for each of the second plurality of data packets; converting the first plurality of symbols into a first radio frequency signal; converting the second plurality of symbols into a second radio frequency signal; and synchronizing at least one of: generating the first and the second data streams, packetizing the first and second data streams, baseband processing the first and second plurality of data packets, and converting the first and second plurality of symbols.

    摘要翻译: 公开了一种用于同步信道传输的方法和装置。 该方法的一个实施例包括:产生第一数据流和第二数据流; 打包第一数据流以产生第一多个数据分组; 打包第二数据流以产生第二多个数据分组; 基带处理所述第一多个数据分组以产生所述第一多个数据分组中的每一个的第一多个符号; 基带处理所述第二多个数据分组以产生所述第二多个数据分组中的每一个的第二多个符号; 将所述第一多个符号转换为第一射频信号; 将所述第二多个符号转换为第二射频信号; 以及同步以下各项中的至少一个:产生所述第一和第二数据流,对所述第一和第二数据流进行分组,对所述第一和第二多个数据分组进行基带处理,以及转换所述第一和第二多个符号。

    Cascaded integrator-comb interpolation filter
    9.
    发明授权
    Cascaded integrator-comb interpolation filter 失效
    级联积分梳内插滤波器

    公开(公告)号:US5880687A

    公开(公告)日:1999-03-09

    申请号:US806271

    申请日:1997-02-25

    CPC分类号: H04L27/0002 H03H17/0671

    摘要: A cascaded integrator-comb (CIC) interpolation filter is included within a digital-to-analog converter (138) and includes two up-samplers (150, 164). The two up-samplers (150, 164) also include a sample-and-hold function. The first up-sampler (150) up-samples an output of a differentiator (140). The second up-sampler (164) up-samples an output of an integrator (152) This reduces the area and power requirements of the CIC interpolation filter, while providing approximately the same filtering performance in the pass band and transition band. The total over-sample ratio of the CIC interpolation filter is equal to the first up-sampling ratio multiplied by the second up-sampling ratio. The stop band requirements of the CIC interpolation filter determines the relative sizes of the first and second up-sampling ratios.

    摘要翻译: 级联积分梳(CIC)插值滤波器包括在数模转换器(138)内,并且包括两个上采样器(150,164)。 两个上采样器(150,164)还包括采样保持功能。 第一上采样器(150)对微分器(140)的输出进行上采样。 第二个上采样器(164)对积分器(152)的输出进行上采样。这降低了CIC内插滤波器的面积和功率需求,同时在通带和过渡频带中提供了大致相同的滤波性能。 CIC内插滤波器的总超采样比等于第一个上采样比乘以第二上采样比。 CIC插值滤波器的阻带要求决定了第一和第二上采样比的相对尺寸。

    Method and apparatus for frequency domain ripple compensation for a
communications transmitter
    10.
    发明授权
    Method and apparatus for frequency domain ripple compensation for a communications transmitter 失效
    用于通信发射机的频域纹波补偿的方法和装置

    公开(公告)号:US5825826A

    公开(公告)日:1998-10-20

    申请号:US724097

    申请日:1996-09-30

    摘要: A data stream to be transmitted is received by a digital interface (52) and converted into a frequency encoded data. A gains block (54) receives the frequency encoded data and a gain adjustment signal, and produces a gain adjusted data to compensate for undesirable system level passband gain variation. The gain adjusted data is converted to a time domain data. The time domain data is processed by a high-pass and a droop correction filter (58, 59) to produce a filtered data. The filtered data is provided through an analog front-end (60) in order to provide a filtered analog data.

    摘要翻译: 要发送的数据流由数字接口(52)接收并转换成频率编码数据。 增益块(54)接收频率编码数据和增益调整信号,并产生增益调整数据以补偿不期望的系统级通带增益变化。 增益调整后的数据被转换为时域数据。 时域数据由高通和下垂校正滤波器(58,59)处理以产生滤波数据。 滤波后的数据通过模拟前端(60)提供,以便提供经滤波的模拟数据。