Coding scheme for cable modems
    1.
    发明授权
    Coding scheme for cable modems 有权
    电缆调制解调器的编码方案

    公开(公告)号:US06549584B1

    公开(公告)日:2003-04-15

    申请号:US09345054

    申请日:1999-06-30

    IPC分类号: H04L512

    摘要: A modem (12) including a least-significant bit convolutional coding scheme is disclosed. In the transmit side of the modem (12), an encoder (28) is included, within which convolutional coders (35I, 35Q) are used to each encode one bit of each symbol applied to a phase and amplitude modulation constellation, preferably the least significant bits, such that the encoded bits select one of a plurality of sub-constellations in the modulated signal. Each of the coders (35, 35′) are arranged as finite state machines, of either thirty-two or sixty-four states. The minimum Hamming distance (dfree) provided by the codes is four, such that the resulting coding gain of the modem is improved over conventional encoding schemes.

    摘要翻译: 公开了一种包括最低有效位卷积编码方案的调制解调器(12)。 在调制解调器(12)的发送侧,包括编码器(28),其中使用卷积编码器(35I,35Q)来对编码器施加到相位和幅度调制星座的每个符号的每一位进行编码,优选最小 使得编码比特选择调制信号中的多个子星座中的一个。 每个编码器(35,35')被布置为有限状态机,三十二或六十四个状态。 代码提供的最小汉明距离(dfree)为4,使得调制解调器的最终编码增益比传统的编码方式有所改善。

    Central office linecard and method for mapping companded data formats
    2.
    发明授权
    Central office linecard and method for mapping companded data formats 有权
    中央办公室线卡和映射压缩数据格式的方法

    公开(公告)号:US06400769B1

    公开(公告)日:2002-06-04

    申请号:US09129070

    申请日:1998-08-04

    IPC分类号: H03B300

    摘要: A linecard codec (250) eliminates limitations of companded code disclosed which increases data rates over a public switched telephone network. The network links a plurality of subscribers and services providers through a central office facility (25) which includes at least one digital backplane (150). The codec (250) comprises an analog interface (152) to the network and a converter (258) coupled to the analog interface and configured to convert analog signals from subscribers to linear coded data (259). A RAM table (262) is used to map the linear coded data (259) to a predetermined coding scheme based on the values stored in the RAM table (262). The RAM table (262) stores mapping values that determine a mapping function between data transmitted by a service provider on the digital backplane (150) and data transmitted to a subscriber.

    摘要翻译: 线路编解码器(250)消除了公开的压缩码的限制,这增加了公共交换电话网络上的数据速率。 网络通过包括至少一个数字背板(150)的中心局设施(25)来连接多个订户和服务提供商。 编解码器(250)包括到网络的模拟接口(152)和耦合到模拟接口并被配置为将来自用户的模拟信号转换成线性编码数据(259)的转换器(258)。 RAM表(262)用于基于存储在RAM表(262)中的值将线性编码数据(259)映射到预定编码方案。 RAM表(262)存储确定由数字背板(150)上的服务提供商发送的数据与发送给用户的数据之间的映射函数的映射值。

    Communications device with extended filter and line monitoring function
    3.
    发明授权
    Communications device with extended filter and line monitoring function 有权
    具有扩展滤波和线路监控功能的通信设备

    公开(公告)号:US06434167B1

    公开(公告)日:2002-08-13

    申请号:US09152423

    申请日:1998-09-11

    IPC分类号: H04J102

    CPC分类号: H04M11/06

    摘要: A communications device (100) with an extended filter (74) provides more bandwidth for V.34, V.90 and other data communications protocols. The device (100) permits voice and data communications over the same twisted pair connection (22) to a central office facility (35) and allows an increased data rate between a subscriber (15) and the central office linecard (50). A variable frequency filter (74) capable of switching between “voice” mode and “data” mode is used. In “data” mode, the bandwidth of filter (74) is extend to provide more bandwidth which can be utilized to transfer data. A line monitoring mechanism (102) is provided which monitors the PCM data flowing over a digital backplane (60) as well as requests from a subscriber for an increased data rate connection. A micro-controller (104) can be provided to adjust the bandwidth of the filter (74) and cause it to enter “data” mode.

    摘要翻译: 具有扩展滤波器(74)的通信设备(100)为V.34,V.90和其他数据通信协议提供更多带宽。 设备(100)允许通过相同的双绞线连接(22)到中心局设施(35)的语音和数据通信,并且允许在订户(15)和中心局线路卡(50)之间增加的数据速率。 使用能够在“语音”模式和“数据”模式之间切换的可变频率滤波器(74)。 在“数据”模式中,滤波器(74)的带宽被扩展以提供可用于传输数据的更多带宽。 提供了一种线路监测机构(102),其监视在数字背板(60)上流动的PCM数据以及来自订户的增加的数据速率连接的请求。 可以提供微控制器(104)以调整过滤器(74)的带宽并使其进入“数据”模式。

    Trellis shaping for PCM modems
    4.
    发明授权
    Trellis shaping for PCM modems 失效
    用于PCM调制解调器的网格整形

    公开(公告)号:US06252911B1

    公开(公告)日:2001-06-26

    申请号:US09096062

    申请日:1998-06-11

    IPC分类号: H04L512

    CPC分类号: H04L25/4927

    摘要: A trellis shaping method is described that may be used for suppressing DC components and/or Nyquist frequency components from the outputs of a PCM (56K) modem. The technique is based on convolutional codes. The code is generated through the use of a Viterbi decoder. Data bits are mapped for transmission into a set of n magnitudes and (n−k) sign bits s. The sign bits s are passed through (HT)−1 to get preliminary sing bits t=s (HT)−1 of size n. (HT)−1 is a matrix of size (n−k) by n which represents the left inverse of the syndrome-former matrix HT of convolutional code c=b G, defined so that G HT=0. The convolutional code is then added to sign bits t through an XOR operation to give final sign bits s (HT)−1+b G. After transmission, the final sign bits are passed through HT to give an output of (s (HT)−1+b G) (HT))=s, for recovery of the data bits.

    摘要翻译: 描述了可用于从PCM(56K)调制解调器的输出抑制DC分量和/或奈奎斯特频率分量的网格整形方法。 该技术基于卷积码。 该代码通过使用维特比解码器生成。 映射数据位以传输到一组n个幅度和(n-k)个符号位。 符号位通过(HT)-1,以获得大小为n的初步字位t = s(HT)-1。 (HT)-1是大小(n-k)乘以n的矩阵,其表示卷积码c = b G的综合征 - 形成矩阵HT的左倒数,使得G HT = 0。 然后通过XOR操作将卷积码添加到符号位t,以得到最终符号位s(HT)-1 + b G。传输后,最终符号位通过HT,输出(s(HT) -1 + b G)(HT))= s,用于恢复数据位。

    Wireless communications system with cycling of unique cell bit sequences in station communications
    5.
    发明授权
    Wireless communications system with cycling of unique cell bit sequences in station communications 有权
    无线通信系统,在站通信中具有独特的小区位序列循环

    公开(公告)号:US08107420B2

    公开(公告)日:2012-01-31

    申请号:US12034534

    申请日:2008-02-20

    IPC分类号: H04W4/00

    CPC分类号: H04B7/2656

    摘要: A wireless communication system (10). The system comprises transmitter circuitry (BST1) comprising circuitry for transmitting a plurality of frames to a receiver in a first cell (Cell 1). Each of the plurality of frames comprises a bit group (22), and the bit group uniquely distinguishes the first cell from a second cell (Cell 2) adjacent the first cell. The transmitter circuitry further comprises circuitry (54) for inserting a bit sequence into the bit group. The bit sequence is selected from a plurality of bit sequences (S1-SK) such that successive transmissions by the transmitter circuitry comprise a cycle of successive ones of the plurality of bit sequences.

    摘要翻译: 一种无线通信系统(10)。 该系统包括发射机电路(BST1),包括用于将第一小区(小区1)中的多个帧发射到接收机的电路。 多个帧中的每一个包括位组(22),并且该位组将第一单元与第一单元相邻的第二单元(单元2)唯一区分开。 发射机电路还包括用于将比特序列插入到比特组中的电路(54)。 从多个比特序列(S1-SK)中选择比特序列,使得发射机电路的连续传输包括多个比特序列中的连续的一个比特序列的周期。

    INTEGRATED CIRCUITS, SYSTEMS, APPARATUS, PACKETS AND PROCESSES UTILIZING PATH DIVERSITY FOR MEDIA OVER PACKET APPLICATIONS
    6.
    发明申请
    INTEGRATED CIRCUITS, SYSTEMS, APPARATUS, PACKETS AND PROCESSES UTILIZING PATH DIVERSITY FOR MEDIA OVER PACKET APPLICATIONS 有权
    集成电路,系统,设备,分组和处理使用分组应用程序中的媒体路径多样性

    公开(公告)号:US20100091800A1

    公开(公告)日:2010-04-15

    申请号:US12638578

    申请日:2009-12-15

    IPC分类号: H04L29/02

    摘要: In one form of the invention, a process of sending real-time information from a sender computer (103) to a receiver computer (105) coupled to the sender computer (103) by a packet network (100) wherein packets (111,113) sometimes become lost, includes steps of directing (441) packets (111) containing the real-time information from the sender computer (103) by at least one path (119) in the packet network (100) to the receiver computer (105), and directing packets (113) containing information dependent on the real-time information from the sender computer (103) by at least one path diversity path (117) in the packet network (100) to the same receiver computer (105). Other forms of the invention encompass other processes, improved packets and packet ensembles (111,113), integrated circuits (610), chipsets (DSP 1721, MCU), computer cards (1651), information storage articles (1511,1611), systems, computers (103,105), gateways (191,193), routers (131,133), cellular telephone handsets (181,189), wireless base stations (183,187), appliances (1721,1731,1741), and packet networks (100), and other forms as disclosed and claimed.

    摘要翻译: 在本发明的一种形式中,发送计算机(103)将实时信息发送到分组网络(100)耦合到发送方计算机(103)的接收机(105)的过程,其中分组(111,113)有时 包括将包含来自发送者计算机(103)的实时信息的分组(441)通过分组网络(100)中的至少一个路径(119)引导到接收机计算机(105)的步骤, 以及将分组网络(100)中的至少一个路径分集路径(117)包含取决于来自发送者计算机(103)的实时信息的信息的分组(113)导向到同一接收机计算机(105)。 本发明的其他形式包括其他过程,改进的分组和分组集合(111,113),集成电路(610),芯片组(DSP1721,MCU),计算机卡(1651),信息存储产品(1511,1611),系统,计算机 (103,105),网关(191,193),路由器(131,133),蜂窝电话手机(181,189),无线基站(183,187),设备(1721,1731,1741)和分组网络(100) 声称。

    Wireless Communications System With Cycling Of Unique Cell Bit Sequences In Station Communications
    8.
    发明申请
    Wireless Communications System With Cycling Of Unique Cell Bit Sequences In Station Communications 有权
    无线通信系统在站通信中循环独特的小区位序列

    公开(公告)号:US20080170638A1

    公开(公告)日:2008-07-17

    申请号:US12034534

    申请日:2008-02-20

    IPC分类号: H04L27/00

    CPC分类号: H04B7/2656

    摘要: A wireless communication system (10). The system comprises transmitter circuitry (BST1) comprising circuitry for transmitting a plurality of frames to a receiver in a first cell (Cell 1). Each of the plurality of frames comprises a bit group (22), and the bit group uniquely distinguishes the first cell from a second cell (Cell 2) adjacent the first cell. The transmitter circuitry further comprises circuitry (54) for inserting a bit sequence into the bit group. The bit sequence is selected from a plurality of bit sequences (S1-SK) such that successive transmissions by the transmitter circuitry comprise a cycle of successive ones of the plurality of bit sequences.

    摘要翻译: 一种无线通信系统(10)。 该系统包括发射机电路(BST 1),包括用于向第一小区(小区1)中的接收机发送多个帧的电路。 多个帧中的每一个包括位组(22),并且该位组将第一单元与第一单元相邻的第二单元(单元2)区分开。 发射机电路还包括用于将比特序列插入到比特组中的电路(54)。 该比特序列是从多个比特序列中选择的,使得发射机电路的连续传输包括多个 位序列。

    Code division multiple access wireless system with time reversed space time block transmitter diversity
    9.
    发明授权
    Code division multiple access wireless system with time reversed space time block transmitter diversity 有权
    码分多址无线系统具有时间反转空间时间块发射机多样性

    公开(公告)号:US07154958B2

    公开(公告)日:2006-12-26

    申请号:US09885878

    申请日:2001-06-20

    IPC分类号: H04B7/06

    摘要: A wireless communication network (10) includes a wireless transmitter having a plurality of antennas (AT11, AT12). The transmitter includes for each of a plurality of different user channels (Dn), circuitry (22n) for providing a plurality of groups of symbols in a first symbol group sequence (D1n). Each of the plurality of different user channels includes circuitry (241n) for forming a first modulated symbol group sequence for the user channel by modulating the symbols in the first symbol group sequence with a unique code that corresponds to the user channel and distinguishes the user channel from each other of the plurality of different user channels and circuitry (261) for combining the first modulated symbol group sequences for transmission by a first antenna (AT11). Each of the plurality of different user channels includes circuitry (22n) for forming a second symbol group sequence (D2n) by time reversing symbols in at least some of the groups of symbols.

    摘要翻译: 无线通信网络(10)包括具有多个天线(AT 1> 1,AT 1 2 N 2)的无线发射机。 发射机包括用于多个不同用户信道(D S)中的每一个,用于在第一符号组序列中提供多个符号组的电路(22) (D n> n)。 多个不同用户信道中的每一个包括用于通过调制第一符号组中的符号来形成用于用户信道的第一调制符号组序列的电路(24< n0> n) 序列,其具有对应于用户信道的唯一代码,并且将用户信道与多个不同用户信道中的用户信道和电路(26 1)进行区分,用于组合用于传输的第一调制符号组序列 第一天线(AT 1 1 1)。 多个不同的用户信道中的每一个包括用于通过时间反转来形成第二符号组序列(D 2> n )的电路(22 ) 符号中的至少一些符号组。