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    Enhanced signal detection for distortion mitigation in optical transmission systems
    1.
    发明授权
    Enhanced signal detection for distortion mitigation in optical transmission systems 有权
    增强信号检测以减少光传输系统中的失真

    公开(公告)号：EP2495921B1

    公开(公告)日：2017-12-20

    申请号：EP11290109.5

    申请日：2011-02-28

    申请人： ALCATEL LUCENT

    发明人： Renaudier, Jeremie ,  Dorize, Christian ,  Bertran-Pardo, Oriol

    IPC分类号： H04L25/03

    CPC分类号： H04L25/03299

    摘要： The present document relates to optical transmission systems. In particular, the present document relates to a system and method for detecting symbols at an optical receiver from an optical signal which has been submitted to distortion in an optical transmission medium. A detection unit (300) configured to detect a symbol from a received digital signal is described, wherein the digital signal has been derived from an optical signal transmitted over a first optical transmitted channel and submitted to noise. The detection unit (300) comprises a noise whitening filter unit (301), configured to filter the received digital signal using a noise whitening filter, wherein the noise whitening filter is configured to whiten the noise, and wherein the noise whitening filter is based on an estimate of a power spectral density of the noise; and a maximum likelihood sequence detector (306), referred to as MLSE detector, downstream of the noise whitening filter unit (301); wherein the MLSE detector (306) is configured to detect the symbol from the filtered digital signal at a given time instant, while taking into account one or more symbols of one or more previous time instants.

    EQUALIZERS FOR MULTI-BRANCH RECEIVER
    4.
    发明公开
    EQUALIZERS FOR MULTI-BRANCH RECEIVER 审中-公开
    均衡器一个多个分支接收器

    公开(公告)号：EP1766910A1

    公开(公告)日：2007-03-28

    申请号：EP05762591.5

    申请日：2005-07-07

    申请人： TELEFONAKTIEBOLAGET LM ERICSSON (publ)

    发明人： HUI, Dennis

    IPC分类号： H04L25/03

    CPC分类号： H04L25/03299 ,  H04L1/0618 ,  H04L25/03184 ,  H04L25/03331 ,  H04L2025/03375

    摘要： A multi-branch receiver comprises a plurality of signal branches including branch filters to filter respective branch input signals and to produce corresponding branch output signals, a combiner to combine the branch output signals to produce a combined baseband signal, a pre­-filter to filter the combined baseband signal to produce a received signal with minimum phase channel characteristics, and an equalizer to generate an estimate of a data sequence contained in the received signal.

    Sequence estimation for space-time coded signals
    5.
    发明公开
    Sequence estimation for space-time coded signals 有权
    FolgechätzungfürRaum-Zeit-Kodierte Signale

    公开(公告)号：EP1753192A1

    公开(公告)日：2007-02-14

    申请号：EP06124061.0

    申请日：2001-04-02

    申请人： AT&T Corp.

    发明人： Naguib, Ayman, F. ,  Calderbank, Arthur, R

    IPC分类号： H04L25/03 ,  H04L1/06

    CPC分类号： H04L25/03331 ,  H04L1/0618 ,  H04L25/03299

    摘要： In connection with transmitted space-time, trellis encoded, signals that pass through a transmission channel that is characterized by memory, improved performance is realized with a receiver that combines a decoder with an equalizer that selects the trellis transition, s, that minimizes the metric ξ j k = r k - ∑ l = L 1 + 1 L 1 h ˜ j l ⁢ s ˜ ⁢ k - l - ∑ l = L 1 + 1 L + 1 h ˜ j l ⁢ s ^ ⁢ k - l 2
    where f̃ j ( l ) is related to both the transmission channel and to the encoding structure in the transmitter, s̃ ( k ) are the (trial) symbols according to a certain transition and ŝ ( k ) are the symbols that were previously decided.

    摘要翻译： 结合传输的时空，网格编码，通过存储器特征的传输信道的信号，改进的性能是通过将解码器与均衡器组合的接收机来实现的，所述均衡器选择最小化度量的网格转换s ¾jk = rk - 'l = L 1 + 1 L 1 hÜjl ¢Ü ¢k - l - 'l = L 1 + 1 L + 1 hÜjl ¢s ^ ¢k - 其中fj（l）与发射机中的传输信道和编码结构相关，s（k）是根据某个转换的（试验）符号，s（k）是先前决定的符号 。

    SINGLE-ANTENNA INTERFERENCE CANCELLATION RECEIVER WITH IMPROVED DECISION FEEDBACK FOR GSM SYSTEMS
    6.
    发明公开
    SINGLE-ANTENNA INTERFERENCE CANCELLATION RECEIVER WITH IMPROVED DECISION FEEDBACK FOR GSM SYSTEMS 有权
    接收器，用于干扰抑制具有单个天线，以用于GSM系统的增强的判决反馈均衡

    公开(公告)号：EP1569399A1

    公开(公告)日：2005-08-31

    申请号：EP05101385.2

    申请日：2005-02-23

    申请人： TEXAS INSTRUMENTS INCORPORATED

    发明人： Onggosanusi, Eko N. ,  Dabak, Anand G. ,  Schmidl, Timothy M

    IPC分类号： H04L25/02 ,  H04L25/03

    CPC分类号： H04L25/03299 ,  H04L25/0226 ,  H04L25/0236 ,  H04L25/025 ,  H04L25/03292 ,  H04L25/03305

    摘要： A receiver (MST) for use in a modulated communications system wherein data is communicated in a time-slotted format. The receiver comprises circuitry (28) for providing samples of a group of data from the time-slotted format and circuitry (46,42) for determining a first set of channel estimates in response to a first set of the samples. The receiver also comprises circuitry (30) for first predicting decisions for data in the group of data in response to the first set of channel estimates and circuitry (46,42) for determining a second set of channel estimates in response to the predicted decisions. Lastly, the circuitry for predicting is further for second predicting decisions for data in the group of data in response to the second set of channel estimates. Iterative channel estimation with a noise whitening filter.

    摘要翻译： 一种接收机（MST），用于调制的通信系统中的数据worin在时隙化格式通信。 该接收机包括：用于向第一组样品的提供一组从确定性开采时隙化格式和电路（46,42）的第一组信道估计的数据的样本在响应电路（28）。 因此，接收机包括用于响应第一预测决策数据组数据的在所述第一组信道估计和用于确定性采矿电路（46,42）的第二组信道估计的响应于所预测的决定电路（30）。 最后，用于预测电路Furtherwirt用于响应于所述第二组信道估计的第二预测决策数据组数据的英寸 与噪声白化滤波器的迭代信道估计。

    Hybrid turbo-MUD for multiple access systems
    7.
    发明公开
    Hybrid turbo-MUD for multiple access systems 审中-公开
    Hybrid-Turbo-MehrbenutzerdetektionfürSysteme mit Mehrfachzugriff

    公开(公告)号：EP1501230A2

    公开(公告)日：2005-01-26

    申请号：EP04017587.9

    申请日：2004-07-24

    申请人： BAE SYSTEMS Information and Electronic Systems Integration, Inc.

    发明人： Learned, Rachel E.

    IPC分类号： H04L1/00 ,  H04B1/707

    CPC分类号： H04L1/005 ,  H04B1/7105 ,  H04L1/0048 ,  H04L1/0054 ,  H04L1/0071 ,  H04L25/0204 ,  H04L25/03171 ,  H04L25/03203 ,  H04L25/03286 ,  H04L25/03299 ,  H04L25/03331 ,  H04L25/067 ,  H04L2025/03611

    摘要： The present invention is a high quality real-time Turbo-MUD processing system initially employing a high complexity multi-user detector that results in better estimates of the bit streams, and then the remaining iterations employing a computationally low linear-based-MUD/Turbo-MUD. The present approach uses more computational computations at the first iteration, and less computations on subsequent processing due to cycling through the Turbo-MUD process with a low complexity sub-optimal detector that significantly cleans up the estimates in a few iterations of the Turbo-MUD. The present invention also provides an efficient means of estimating symbols transmitted in a multi-user environment in overloaded or super-saturated conditions.

    摘要翻译： 本发明是一种高质量的实时Turbo-MUD处理系统，其最初采用高复杂度多用户检测器，其导致比特流的更好估计，然后使用基于计算的低线性MUD / Turbo的剩余迭代 -泥。 目前的方法在第一次迭代中使用更多的计算计算，并且由于通过Turbo-MUD过程循环通过具有低复杂度次优检测器的后续处理的较少计算，其在Turbo-MUD的几次迭代中显着地清除了估计值 。 本发明还提供了一种估计在多用户环境中在过载或超饱和条件下发送的符号的有效手段。

    Method and apparatus for shortening the critical path of reduced complexity sequence estimation techniques
    8.
    发明公开
    Method and apparatus for shortening the critical path of reduced complexity sequence estimation techniques 有权
    用于序列估计方法中的关键路径的缩短的方法和装置减少Kompexität

    公开(公告)号：EP1111863A3

    公开(公告)日：2004-04-14

    申请号：EP00310939.4

    申请日：2000-12-08

    申请人： LUCENT TECHNOLOGIES INC.

    发明人： Azadet, Kameran ,  Haratsch, Erich Franz

    IPC分类号： H04L25/03 ,  H04L27/34

    CPC分类号： H04L25/03197 ,  H04L25/03235 ,  H04L25/03299

    摘要： A method and apparatus are disclosed for improving the processing time of reduced complexity sequence estimation techniques, such as reduced state sequence estimation (RSSE). The possible values for the branch metrics in the RSSE are precomputed to permit pipelining and the shortening of the critical path. Precomputing the branch metrics for all possible symbol combinations in the channel memory makes it possible to remove the branch metrics unit (BMU) and decision-feedback unit (DFU) from the feedback loop, thereby reducing the critical path. A look-ahead branch metrics unit (LABMU) and an intersymbol interference canceller (ISIC) precompute the branch metrics for all possible values for the channel memory. At the beginning of each decoding cycle, a set of multiplexers (MUXs) select the appropriate branch metrics based on the survivor symbols in the corresponding survivor path cells (SPCs), which are then sent to an add-compare-select unit (ACSU). The computational load of the precomputations is reduced for multi-dimensional trellis codes by precomputing each dimension of the multi-dimensional trellis code separately. Prefiltering techniques are used to reduce the computational complexity by shortening the channel memory. A hybrid survivor memory architecture is also disclosed for a RSSE for a channel having a channel memory of length L, where the survivors corresponding to the L past decoding cycles are stored in a register exchange architecture (REA), and survivors corresponding to later decoding cycles are stored in a trace-back architecture (TBA) or register exchange architecture (REA). Symbols are mapped to information bits to reduce the word size before being moved from the first register exchange architecture (REA) to the trace-back architecture (TBA) or the second register exchange architecture (REA).