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    Codebook with nested structure
    61.
    发明授权
    Codebook with nested structure 有权

    公开(公告)号：US08346193B2

    公开(公告)日：2013-01-01

    申请号：US13547617

    申请日：2012-07-12

    Applicant: Mohammad Ali Khojastepour ,  Narayan Prasad

    Inventor： Mohammad Ali Khojastepour ,  Narayan Prasad

    IPC: H04B1/04

    CPC classification number: H04B7/0617 ,  H04B7/0456 ,  H04B7/0632 ,  H04B7/0639

    Abstract: A multi-rank beamforming (MRBF) scheme in which the downlink channel is estimated and an optimal precoding matrix to be used by the MRBF transmitter is determined accordingly. The optimal precoding matrix is selected from a codebook of matrices having a recursive structure which allows for efficient computation of the optimal precoding matrix and corresponding Signal to Interference and Noise Ratio (SINR). The codebook also enjoys a small storage footprint. Due to the computational efficiency and modest memory requirements, the optimal precoding determination can be made at user equipment (UE) and communicated to a transmitting base station over a limited uplink channel for implementation over the downlink channel.

    Polmux-OFDM-DD Transmitter and Receiver for Reduced Complexity and Overhead in Optical Access/Metro Transmission
    62.
    发明申请
    Polmux-OFDM-DD Transmitter and Receiver for Reduced Complexity and Overhead in Optical Access/Metro Transmission 有权
    Polmux-OFDM-DD发射机和接收机，用于降低光接入/城域传输中的复杂性和开销

    公开(公告)号：US20120263467A1

    公开(公告)日：2012-10-18

    申请号：US13446306

    申请日：2012-04-13

    Applicant: Neda Cvijetic ,  Yue-Kai Huang ,  Narayan Prasad ,  Ting Wang

    Inventor： Neda Cvijetic ,  Yue-Kai Huang ,  Narayan Prasad ,  Ting Wang

    IPC: H04J14/06

    CPC classification number: H04J14/06 ,  H04B10/532 ,  H04B10/548 ,  H04J14/02 ,  H04L5/0023 ,  H04L25/0204 ,  H04L27/2096 ,  H04L27/223 ,  H04L27/2697 ,  H04L2025/03414 ,  H04L2025/03426

    Abstract: An optical communication system includes a polarization multiplexed orthogonal frequency-division multiplexing POLMUX-OFDM transmitter for generating a POLMUX-OFDM double sideband signal, an optical processing path for processing the double sideband signal from the transmitter; an analog-to-digital convert ADC-OFDM receiver coupled to the optical processing path for receiving the double sideband signal processed by the optical path; and a block-diagonal multiple-input multiple-output MIMO equalizer responsive to the receiver for enabling correct operation for a completely random incoming signal polarization state without adaptive polarization control at said receiver, which enables complexity.

    Abstract translation: 光通信系统包括用于产生POLMUX-OFDM双边带信号的偏振复用正交频分复用POLMUX-OFDM发射机，用于处理来自发射机的双边带信号的光处理路径; 耦合到光学处理路径的用于接收由光路处理的双边带信号的模数转换ADC-OFDM接收器; 以及响应于接收机的块对角多输入多输出MIMO均衡器，用于使能在所述接收机处没有自适应偏振控制的完全随机输入信号偏振状态的正确操作，这使得复杂性。

    Spherical lattice codes for lattice and lattice-reduction-aided decoders
    64.
    发明授权
    Spherical lattice codes for lattice and lattice-reduction-aided decoders 有权
    用于晶格和晶格减少辅助解码器的球形晶格码

    公开(公告)号：US08091006B2

    公开(公告)日：2012-01-03

    申请号：US11694241

    申请日：2007-03-30

    Applicant: Narayan Prasad ,  Xiaodong Wang ,  Mohammad Madihian

    Inventor： Narayan Prasad ,  Xiaodong Wang ,  Mohammad Madihian

    IPC: H03M13/00

    CPC classification number: H03M13/01 ,  H04L1/0631 ,  H04L1/0637

    Abstract: Methods and apparatus for designing spherical lattice codebooks for use in data transmission systems are provided. A spherical lattice codebook is constructed by determining the channel statistics of one or more channels, which can be accomplished by observing a sufficiently large set of channel realizations. After determining the channel statistics, an expression for the error probability of the decoder or expressions for bounds on the error probability and expressions for the corresponding gradients are determined. The gradient is then used in an optimization technique to produce a spherical lattice codebook which is subsequently used for transmission.

    Abstract translation: 提供了用于数据传输系统中使用的球面晶格码本的方法和装置。 通过确定一个或多个信道的信道统计量来构造球面晶格码本，其可以通过观察足够大的信道实现集来实现。 在确定信道统计后，确定解码器的错误概率或对于对应梯度的误差概率和表达式的边界的表达式的表达式。 然后将梯度用于优化技术中以产生随后用于传输的球形晶格码本。

    Group LMMSE demodulation using noise and interference covariance matrix for reception on a cellular downlink
    66.
    发明授权
    Group LMMSE demodulation using noise and interference covariance matrix for reception on a cellular downlink 有权
    使用噪声和干扰协方差矩阵组合LMMSE解调，用于在蜂窝下行链路上接收

    公开(公告)号：US08036601B2

    公开(公告)日：2011-10-11

    申请号：US12047514

    申请日：2008-03-13

    Applicant: Narayan Prasad ,  Xiaodong Wang ,  Mohammad Madihian

    Inventor： Narayan Prasad ,  Xiaodong Wang ,  Mohammad Madihian

    IPC: H04B1/00 ,  H04B15/00

    CPC classification number: H04B1/71055

    Abstract: A method for filtering in a wireless downlink channel, where all dominant transmitting sources use inner codes from a particular set, includes the steps of estimating a channel matrix seen from a desired transmitter source in response to a pilot or preamble signal; converting the estimated channel matrix into an effective channel matrix responsive to the inner code of the desired transmitting source; estimating a covariance matrix of noise plus interference in a linear model whose output is an equivalent of the received observations and in which the effective channel matrix corresponding to each dominant transmitting source inherits the structure of its inner code; computing a signal-to-noise-interference-ratio SINR responsive to the covariance matrix and the effective channel matrix corresponding to the desired source; and feeding back the computed SINR to the transmitter source.

    Abstract translation: 一种在无线下行链路信道中进行滤波的方法，其中所有主要发射源使用来自特定集合的内部码包括以下步骤：响应于导频或前导信号估计从期望的发射机源看到的信道矩阵; 响应于期望的发送源的内部码，将估计的信道矩阵转换成有效信道矩阵; 在线性模型中估计噪声加干扰的协方差矩阵，其输出等于接收到的观测值，并且其中对应于每个主导发射源的有效信道矩阵继承其内部码的结构; 响应于协方差矩阵和对应于期望源的有效信道矩阵来计算信噪比干扰比SINR; 并将所计算的SINR反馈到发射机源。

    Group MMSE-DFD with rate (SINR) feedback and pre-determined decoding order for reception on a cellular downlink
    67.
    发明授权
    Group MMSE-DFD with rate (SINR) feedback and pre-determined decoding order for reception on a cellular downlink 有权
    具有速率（SINR）反馈的组MMSE-DFD和用于在蜂窝下行链路上接收的预定解码顺序

    公开(公告)号：US08031798B2

    公开(公告)日：2011-10-04

    申请号：US12047544

    申请日：2008-03-13

    Applicant: Narayan Prasad ,  Xiaodong Wang ,  Mohammad Madihian

    Inventor： Narayan Prasad ,  Xiaodong Wang ,  Mohammad Madihian

    IPC: H04B15/00

    CPC classification number: H04W72/082 ,  H04B7/0854 ,  H04B17/24 ,  H04B17/336 ,  H04L1/0026 ,  H04L1/0631 ,  H04L1/0668 ,  H04L25/03057 ,  H04L2025/03414 ,  H04L2025/0349 ,  H04W4/06 ,  H04W24/00 ,  H04W84/042

    Abstract: A method for decoding and rate assignment in a wireless channel, where all dominant transmitter sources use inner codes from a particular set, comprising the steps of: i) estimating channel matrices seen from all dominant transmitter sources in response to a pilot or preamble signal transmitted by each such source; ii) converting each estimated channel matrix into an effective channel matrix responsive to the inner code of the corresponding transmitter source; iii) obtaining the received observations in a linear equivalent form (linear model) whose output is an equivalent of the received observations and in which the effective channel matrix corresponding to each dominant transmitter source inherits the structure of its inner code; iv) processing the transmitter sources according to the specified (or pre-determined) order of decoding; v) for each transmitter source, assuming perfect cancellation of signals of preceding transmitter sources; vi) computing a signal-to-interference-noise-ratio SINR responsive to the effective channel matrix of the transmitter source and the covariance matrix of the noise plus signals from remaining transmitter sources; and vii) feeding back all computed SINRs to respective transmitter sources.

    Abstract translation: 一种用于在无线信道中解码和速率分配的方法，其中所有主要发射机源使用来自特定集合的内部码，包括以下步骤：i）响应于传输的导频或前导信号估计从所有主要发射机源看到的信道矩阵 由每个这样的来源; ii）响应于对应的发射机源的内部码，将每个估计的信道矩阵转换成有效信道矩阵; iii）以线性等效形式（线性模型）获得接收到的观测值，其输出等于所接收的观测值，并且其中对应于每个主要发射机源的有效信道矩阵继承其内部码的结构; iv）根据指定（或预定）解码顺序处理发射机源; v）对于每个发射机源，假设完全取消先前发射机的信号; vi）响应于发射机源的有效信道矩阵和来自剩余发射机源的噪声加信号的协方差矩阵来计算信噪比SINR; 和vii）将所有计算的SINR反馈到相应的发射机源。

    BEAM COMBINATION METHODS AND SYSTEMS FOR ADAPTING COMMUNICATION LINKS TO VARYING CHANNEL CONDITIONS
    68.
    发明申请
    BEAM COMBINATION METHODS AND SYSTEMS FOR ADAPTING COMMUNICATION LINKS TO VARYING CHANNEL CONDITIONS 有权
    用于适应通信链路变化的通道条件的波束组合方法和系统

    公开(公告)号：US20110113137A1

    公开(公告)日：2011-05-12

    申请号：US12941546

    申请日：2010-11-08

    Applicant: Kishore Ramachandran ,  Narayan Prasad ,  Sampath Rangarajan

    Inventor： Kishore Ramachandran ,  Narayan Prasad ,  Sampath Rangarajan

    IPC: G06F15/16

    CPC classification number: H04B7/0408 ,  H04B1/1027 ,  H04B7/063 ,  H04B7/0695 ,  H04B7/088

    Abstract: Methods and systems for rectifying deteriorated channel conditions on a communication link are described. In response to the detection of a link deterioration event, a cluster of beams about a currently utilized beam pair can be trialed to determine a suitable, alternate pair of beams on which to establish a communication link. In turn, in the case of a link blockage event, a set of beams having a relatively large azimuthal angle with respect to a currently utilized beam pair can be trialed to determine a suitable beam pair for further communication.

    Abstract translation: 描述了用于整流通信链路恶化的信道条件的方法和系统。 响应于链路劣化事件的检测，可以尝试关于当前使用的波束对的一束波束，以确定在其上建立通信链路的合适的一对波束。 反过来，在链路阻塞事件的情况下，可以对相对于当前利用的波束对具有相对大的方位角的一组波束进行试验，以确定用于进一步通信的合适的波束对。

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