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24 条记录 (耗时 0.038 秒)

    Turbo code decoder with modified systematic symbol transition probabilities
    11.
    发明授权
    Turbo code decoder with modified systematic symbol transition probabilities 有权
    具有修改的系统符号转换概率的Turbo码解码器

    公开(公告)号：US06263467B1

    公开(公告)日：2001-07-17

    申请号：US09137256

    申请日：1998-08-20

    申请人： Stephen Michael Hladik ,  John Anderson Fergus Ross ,  Nick Andrew Van Stralen

    发明人： Stephen Michael Hladik ,  John Anderson Fergus Ross ,  Nick Andrew Van Stralen

    IPC分类号： H03M1300

    CPC分类号： H03M13/3927 ,  H03M13/2957 ,  H03M13/6502 ,  H03M13/658

    摘要： A feedback control for a turbo decoder controls the feedback between component decoders of the turbo decoder by substituting either a neutral value or a weighted value for the channel transition probabilities utilized by each component decoder during the iterative decoding process. A control switch selects either estimated channel transition probabilities, modifications of these values, or neutral values as the channel transition probabilities utilized by the next component decoder in the subsequent decoding iteration.

    摘要翻译： 用于turbo解码器的反馈控制通过在迭代解码过程中将每个分量解码器使用的信道转换概率代入中性值或加权值来控制turbo解码器的组件解码器之间的反馈。 控制开关选择估计的信道转换概率，这些值的修改或中性值作为下一个分量解码器在随后的解码迭代中使用的信道转换概率。

    Modular turbo decoder for expanded code word length
    12.
    发明授权
    Modular turbo decoder for expanded code word length 有权
    用于扩展码字长度的模块化turbo解码器

    公开(公告)号：US06594792B1

    公开(公告)日：2003-07-15

    申请号：US09561333

    申请日：2000-04-28

    申请人： Stephen Michael Hladik ,  Abdallah Mahmoud Itani ,  Nick Andrew Van Stralen ,  Robert Gideon Wodnicki ,  John Anderson Fergus Ross

    发明人： Stephen Michael Hladik ,  Abdallah Mahmoud Itani ,  Nick Andrew Van Stralen ,  Robert Gideon Wodnicki ,  John Anderson Fergus Ross

    IPC分类号： H03M1329

    CPC分类号： H03M13/3905 ,  H03M13/2957 ,  H03M13/3933 ,  H03M13/3972

    摘要： A turbo decoder system utilizing a MAP decoding algorithm has a predetermined number of turbo decoder modules for decoding segments of a turbo code component code word in parallel, thereby expanding the block-length and data-rate capability of the turbo decoder system. Input data samples are provided to an interleaver/de-interleaver module wherein they are divided into segments of predetermined size, each segment being provided to a respective turbo decoder module. The outputs of each turbo decoder module are a posteriori probabilities which are re-ordered in the interleaver/de-interleaver module, segmented, and provided back to the turbo decoders as a priori information-bit probabilities. For the case of a turbo code comprising two component codes, the a posteriori information-bit probabilities are re-ordered according to the interleaver definition at the end of odd-numbered half iterations, while at the end of even-numbered half iterations, they are re-ordered according to the de-interleaver definition. Decoding continues until the desired number of iterations have been performed. Data decisions are made on the final a posteriori bit probability estimates.

    摘要翻译： 利用MAP解码算法的turbo解码器系统具有预定数量的turbo解码器模块，用于并行地解码turbo码分量码字的段，从而扩展turbo解码器系统的块长度和数据速率能力。 将输入数据样本提供给交织器/解交织器模块，其中它们被划分成预定大小的段，每个段被提供给相应的turbo解码器模块。 每个turbo解码器模块的输出是在交织器/解交织器模块中重排序的后验概率，被分段并作为先验信息比特概率返回给turbo解码器。 对于包括两个分量代码的turbo码的情况，根据奇数半迭代结束时的交织器定义重新排序后验信息比特概率，而在偶数半迭代结束时，它们 根据解交织器定义重新排序。 解码继续，直到执行所需的迭代次数。 对最终的后验位概率估计作出数据决定。

    Method and apparatus for synchronizing a radio telemetry system by way of transmitted-reference, delay-hopped ultra-wideband pilot signal
    16.
    发明授权
    Method and apparatus for synchronizing a radio telemetry system by way of transmitted-reference, delay-hopped ultra-wideband pilot signal 有权
    延迟跳跃超宽带导频信号的方法和装置，用于同步无线遥测系统

    公开(公告)号：US07313127B2

    公开(公告)日：2007-12-25

    申请号：US10125091

    申请日：2002-04-19

    申请人： Ralph Thomas Hoctor ,  Stephen Michael Hladik

    发明人： Ralph Thomas Hoctor ,  Stephen Michael Hladik

    IPC分类号： H04J3/06

    CPC分类号： H04B1/7183 ,  H04B1/692 ,  H04B1/71632

    摘要： A time-division-multiplexed radio communication system and method uses transmitted-reference, delay-hopped (TR/DH) ultra-wideband (UWB) broadcast signal to provide a pilot signal to all mobile devices in a coverage area from which time synchronization is derived. Using this TR/DH UWB pulse pilot signal and low-complexity demodulation in the mobile devices, the mobile devices utilize a simple signal detection algorithm to acquire synchronization with the pilot signal. As a result, all devices in a local area network become synchronized to the system's bit clock. This greatly reduces the search space required for signal acquisition, receiver signal processing complexity, and length of message preambles required to synchronize the base station receiver to a transmission from any of the mobile devices.

    摘要翻译： 时分多路复用无线电通信系统和方法使用发射参考延迟跳跃（TR / DH）超宽带（UWB）广播信号，以向覆盖区域中的所有移动设备提供导频信号，时间同步是 派生。 在移动设备中使用该TR / DH UWB脉冲导频信号和低复杂度解调，移动设备利用简单的信号检测算法获得与导频信号的同步。 因此，局域网中的所有设备都将与系统的位时钟同步。 这大大减少了信号获取所需的搜索空间，接收机信号处理复杂性以及使基站接收机与任何移动设备的传输同步所需的消息前导码的长度。

    Optimal soft-output decoder for tail-biting trellis codes
    17.
    发明授权
    Optimal soft-output decoder for tail-biting trellis codes 失效
    最佳软输出解码器，用于尾部网格码

    公开(公告)号：US5721746A

    公开(公告)日：1998-02-24

    申请号：US636742

    申请日：1996-04-19

    申请人： Stephen Michael Hladik ,  John Bailey Anderson

    发明人： Stephen Michael Hladik ,  John Bailey Anderson

    IPC分类号： H03M13/23 ,  H03M13/25 ,  H03M13/39 ,  H03M13/41 ,  H03M13/45 ,  H03M13/12

    CPC分类号： H03M13/3723 ,  H03M13/3933 ,  H03M13/3938 ,  H03M13/616 ,  H03M13/6583

    摘要： A circular MAP decoder for error-correcting trellis codes that employ tail biting produces soft-decision outputs provides an estimate of the probabilities of the states in the first stage of the trellis, which probabilities replace the a priori knowledge of the starting state in a conventional MAP decoder. The circular MAP decoder provides the initial state probability distribution in either of two ways. The first involves a solution to an eigenvalue problem for which the resulting eigenvector is the desired initial state probability distribution; with knowledge of the starting state, the circular MAP decoder performs the rest of the decoding according to the MAP decoding algorithm. The second is based on a recursion for which the iterations converge to a starting state distribution. After sufficient iterations, a state on the circular sequence of states is known with high probability, and the circular MAP decoder performs the rest of the decoding according to the MAP decoding algorithm.

    摘要翻译： 用于纠错网格码的循环MAP解码器采用尾部咬合产生软判决输出提供了网格第一阶段状态概率的估计，这些概率代替了常规的起始状态的先验知识 MAP解码器。 循环MAP解码器以两种方式之一提供初始状态概率分布。 第一个涉及特征值问题的解，其中所得到的特征向量是期望的初始状态概率分布; 具有开始状态的知识，循环MAP解码器根据MAP解码算法执行其余的解码。 第二个是基于迭代收敛到起始状态分布的递归。 经过充分的迭代，已经以高概率知道了循环状态序列的状态，循环MAP解码器根据MAP解码算法执行其余的解码。

    Synchronization of ultra-wideband communications using a transmitted-reference preamble
    19.
    发明授权
    Synchronization of ultra-wideband communications using a transmitted-reference preamble 有权

    公开(公告)号：US07099422B2

    公开(公告)日：2006-08-29

    申请号：US10125092

    申请日：2002-04-19

    申请人： Ralph Thomas Hoctor ,  Stephen Michael Hladik

    发明人： Ralph Thomas Hoctor ,  Stephen Michael Hladik

    IPC分类号： H04L7/00 ,  H04L27/00

    CPC分类号： H04B1/7183 ,  H04B1/719

    摘要： A method and apparatus of initial synchronization, or acquisition, of time modulated ultra-wideband (UWB) communications uses a transmitted-reference preamble. The method and apparatus require that the transmitter first send a time-reference, delay-hopped (TR/DH) burst; such a burst is easily detected and can be processed to provide a time mark accurate to within a few nanoseconds. Following the transmission of the TR/DH burst, the transmitter waits a fixed period of time, the duration of which is known to the receiver, and then the transmitter sends a burst of pulse position modulation, time hopped (PPM/TH) or other time modulated UWB. After the reception of the first burst, the receiver can estimate the time of reception of the second burst to the accuracy of the time mark.

    Variable-interval pilot symbol aided modulation and demodulation
    20.
    发明授权
    Variable-interval pilot symbol aided modulation and demodulation 有权
    可变间隔导频符号辅助调制和解调

    公开(公告)号：US06519296B1

    公开(公告)日：2003-02-11

    申请号：US09324597

    申请日：1999-06-03

    申请人： Stephen Michael Hladik

    发明人： Stephen Michael Hladik

    IPC分类号： H04L2714

    CPC分类号： H04L27/0014 ,  H04L2027/0087

    摘要： The signaling overhead required for pilot symbol aided modulation is significantly reduced by recognizing that the residual uncertainty in the carrier frequency decreases after an initial carrier frequency estimate is made during an initial signal interval. This allows a commensurate reduction in channel process sampling rate during the remainder of the message; i.e., the frequency uncertainty of the pilot symbols can be decreased. This technique may be particularly effective when the rate of change of the received carrier frequency and phase is low as in fixed satellite terminal equipment. The resultant increase in spectral efficiency makes reduced-overhead pilot symbol aided modulation attractive for applications in low-cost/low-complexity terminal equipment.

    摘要翻译： 通过在初始信号间隔期间在初始载波频率估计之后识别出载波频率中的剩余不确定性减小，导频符号辅助调制所需的信令开销显着降低。 这允许在消息的其余部分期间相应地减少信道处理采样率; 即导频符号的频率不确定性可以减小。 当固定卫星终端设备中的接收载波频率和相位的变化率低时，这种技术可能特别有效。 频谱效率的增加使降低开销的导频符号辅助调制对低成本/低复杂度终端设备中的应用具有吸引力。