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    • 4. 发明申请
    • METHOD OF UPLINK PRECODING FOR RETRANSMISSION WITHOUT EXPLICIT PRECODING INSTRUCTION
    • 无明显预测指标的上行链路预测方法
    • WO2012047952A1
    • 2012-04-12
    • PCT/US2011/054851
    • 2011-10-05
    • MOTOROLA MOBILITY, INC.BROWN, Tyler A.SAYANA, Krishna KamalZHUANG, Xiangyang Zhuang
    • BROWN, Tyler A.SAYANA, Krishna KamalZHUANG, Xiangyang Zhuang
    • H04L1/06H04L1/18
    • H04L1/06H04L1/1887
    • A method for a wireless communication device to re-transmit a data transport block to a base station is described. The method comprises receiving information of a precoding matrix from a base station wherein the precoding matrix comprises of a first precoding submatrix and a second precoding submatrix, transmitting a first data transport block from a first set of at least two antennas according to the first precoding submatrix and a second data transport block from a second set of at least two antennas according to the second precoding submatrix, receiving from the base station information on the retransmission request of one of the first transport block and the second transport block, and retransmitting the second data transport block according to a retransmission precoding matrix from at least one of the first set of antennas and at least one of the second set of antennas, when the received information indicates the retransmission request of the second transport block.
    • 描述了一种用于将数据传输块重新传送到基站的无线通信设备的方法。 该方法包括从基站接收预编码矩阵的信息,其中预编码矩阵包括第一预编码子矩阵和第二预编码子矩阵,根据第一预编码子矩阵从第一组至少两个天线发送第一数据传输块 以及根据所述第二预编码子矩阵的来自第二组至少两个天线的第二数据传输块,从所述基站接收关于所述第一传输块和所述第二传输块之一的重传请求的信息,并且重传所述第二数据 当所接收的信息指示第二传输块的重传请求时,根据来自第一组天线中的至少一个和第二组天线中的至少一个的重传预编码矩阵的传输块。
    • 5. 发明申请
    • METHOD OF CODEBOOK DESIGN AND PRECODER FEEDBACK IN WIRELESS COMMUNICATION SYSTEMS
    • 无线通信系统中的代码设计方法和预编译器反馈
    • WO2012024059A1
    • 2012-02-23
    • PCT/US2011/045209
    • 2011-07-25
    • MOTOROLA MOBILITY, INC.SAYANA, Krishna KamalZHUANG, Xiangyang
    • SAYANA, Krishna KamalZHUANG, Xiangyang
    • H04B7/06
    • H04B7/0639H04B7/0663
    • A method for two component feedback in wireless communication systems wherein a wireless communication device sends a first representation of a first matrix chosen from a first codebook, the first matrix is a N-by-N diagonal matrix with the k-th diagonal elements being σ 1*exp(jπ(k-1)m/N), for k from 1 to N/2 and being σ 2*exp(jπ(k-N/2-1)m/N) for k from N/2+1 to N, N is a number of antennas, m is an integer between 0 and N-1, and σ 1, σ 2 are complex valued scalars. The device also sends a second representation of a second N-by-R matrix chosen from a second codebook, with R being a number of spatial layers wherein the first and second representations together convey a precoder matrix as the matrix product of the first and second matrices.
    • 一种用于无线通信系统中的双分量反馈的方法,其中无线通信设备发送从第一码本选择的第一矩阵的第一表示,所述第一矩阵是N×N对角矩阵,其中第k个对角元素为s 1 * exp(jp(k-1)m / N),对于k从1到N / 2,并且是从N / 2 + 1的k的s 2 * exp(jp(kN / 2-1)m / N) 到N,N是多个天线,m是0和N-1之间的整数,s 1,s 2是复值标量。 所述设备还发送从第二码本中选择的第二N乘R矩阵的第二表示,其中R是多个空间层,其中第一和第二表示一起传送预编码矩阵作为第一和第二码元的矩阵乘积 矩阵。
    • 9. 发明申请
    • CHANNEL ESTIMATOR WITH HIGH NOISE SUPPRESSION AND LOW INTERPOLATION ERROR FOR OFDM SYSTEMS
    • 具有高噪声抑制和OFDM系统低插值误差的信道估计器
    • WO2008118514A2
    • 2008-10-02
    • PCT/US2008/051571
    • 2008-01-21
    • MOTOROLA INC.NOLLETT, Bryan S.SAYANA, Krishna KamalZHUANG, Xiangyang
    • SAYANA, Krishna KamalZHUANG, Xiangyang
    • H04L25/02
    • H04L27/2647H04L25/022H04L25/0228H04L25/025
    • A receiver with DFT based channel estimation having good noise suppression for both high and low signal-to-noise ratios providing advantages over conventional DFT estimators and Minimum-Mean-Square-Error (MMSE) estimators. The use of MMSE may be incorporated for estimation at the band edges providing further improvements. The received signal in the time domain, is transformed to the frequency-domain received signal via an N-point FFT (501). The frequency-domain received signal at the pilot locations is then used to obtain a "noisy" channel estimates at the pilot subcarriers by dividing the known pilot symbols in (503). Uniformly spaced pilots are assumed over a window of usable subcarriers. Padding is applied to the initial channel estimates at both sides of the band to account for unused subcarriers such as guard spacing. Weighting factors during power estimation may take into account various noise characteristics such as combinations of known and time-limited noise power characteristics.
    • 具有基于DFT的信道估计的接收机对于高和低信噪比具有良好的噪声抑制,提供优于常规DFT估计器和最小均方误差(MMSE)估计器的优点。 可以并入MMSE的使用以便在带边缘进行估计,从而提供进一步的改进。 时域中的接收信号通过N点FFT被转换成频域接收信号(501)。 导频位置处的频域接收信号然后用于通过划分(503)中的已知导频符号来在导频子载波处获得“噪声”信道估计。 在可用子载波的窗口上假设均匀间隔的导频。 填充应用于频带两侧的初始信道估计,以解决未使用的子载波,例如保护间隔。 功率估计期间的加权因子可以考虑各种噪声特性,例如已知和时间有限的噪声功率特性的组合。