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    MIMO decoding
    1.
    发明授权
    MIMO decoding 有权
    MIMO解码

    公开(公告)号：US07724832B2

    公开(公告)日：2010-05-25

    申请号：US10857417

    申请日：2004-05-27

    申请人： Srinath Hosur ,  Jaiganesh Balakrishnan ,  Michael Polley ,  Manish Goel ,  Muhammad Ikram

    发明人： Srinath Hosur ,  Jaiganesh Balakrishnan ,  Michael Polley ,  Manish Goel ,  Muhammad Ikram

    IPC分类号： H04K1/10

    CPC分类号： H04L27/2647 ,  H04L25/0204 ,  H04L25/067

    摘要： In MIMO wireless communications employing LMMSE receiver, the symbols transmitted through a transmit antenna are estimated at the receiver in the presence of interference consisting of two main components: one due to the additive noise and the other due to (interfering) symbols transmitted via the remaining antennas. This has been shown to hamper the performance of a communication system resulting in incorrect symbol decisions, particularly at low SNR. IMMSE has been devised as a solution to cope with this problem; In IMMSE processing, the symbols sent via each transmit antenna are decoded iteratively. In each stage of processing, the received signal is updated by removing the contribution of symbols detected in the previous iterations. In principle, this reduces the additive interference in which the desired symbols are embedded in. Therefore, the interference level should reduce monotonically as one goes down in processing order. In a noisy environment, however, any incorrect decision made on a symbol in an iteration leaves its contribution in the updated received signal available for processing in the following iterations. Fortunately, if the level of interference is estimated and the soft bits are scaled appropriately by the estimated interference power, the performance of IMMSE receiver can be greatly improved. Preferred embodiments estimate the interference by computing the probability of error in decoding the symbols of the previous stage(s). The computation of decision error probability depends on the constellation size of transmitted symbols and introduces very little processing overhead.

    摘要翻译： 在采用LMMSE接收机的MIMO无线通信中，在存在由两个主要部分组成的干扰的接收机处估计通过发射天线发射的符号：一个由于加性噪声而导致的，另一个是由于通过剩余的 天线。 已经显示出妨碍通信系统的性能，导致不正确的符号决定，特别是在低SNR下。 IMMSE已被设计为解决这个问题的办法; 在IMMSE处理中，经由每个发送天线发送的符号被迭代地解码。 在每个处理阶段，通过去除在先前迭代中检测到的符号的贡献来更新接收到的信号。 原则上，这降低了嵌入期望符号的附加干扰。因此，干扰电平在处理顺序下降时单调减少。 然而，在嘈杂的环境中，在迭代中对符号做出的任何不正确的决定使其在更新的接收信号中的贡献可用于在以下迭代中进行处理。 幸运的是，如果估计干扰水平，并通过估计的干扰功率适当地缩放软比特，则可以大大提高IMMSE接收机的性能。 优选实施例通过计算解码前一级的符号的误差概率来估计干扰。 决策误差概率的计算取决于传输符号的星座大小，并引入很少的处理开销。

    Scalable folded low-complexity pipeline, method of pipelining and multiple-input, multiple-output receiver employing the same
    3.
    发明申请
    Scalable folded low-complexity pipeline, method of pipelining and multiple-input, multiple-output receiver employing the same 审中-公开
    可扩展折叠低复杂度流水线，流水线方法和多输入多输出接收机

    公开(公告)号：US20050171987A1

    公开(公告)日：2005-08-04

    申请号：US10919873

    申请日：2004-08-17

    申请人： Manish Goel ,  David Milliner ,  Srinath Hosur ,  Muhammad Ikram

    发明人： Manish Goel ,  David Milliner ,  Srinath Hosur ,  Muhammad Ikram

    IPC分类号： G06F7/38 ,  H04B7/04 ,  H04L25/02

    CPC分类号： H04B7/0413 ,  H04L25/024

    摘要： The present invention provides a folded low-complexity (FLC) pipeline. In one embodiment, the FLC pipeline includes a dot product unit chain configured to employ only addition and multiplication operations to compute intermediate numerators and denominators from a received signal matrix, a channel gain matrix and a noise matrix. Additionally, FLC pipeline also includes a divider stage configured to terminate the dot product unit chain by computing an unscaled quotient and a scale factor from ultimate ones of the intermediate numerators and denominators.

    摘要翻译： 本发明提供了一种折叠的低复杂度（FLC）流水线。 在一个实施例中，FLC流水线包括点积单位链，其被配置为仅采用加法和乘法运算来从接收信号矩阵，信道增益矩阵和噪声矩阵计算中间分子和分母。 另外，FLC管线还包括分配器级，其被配置为通过计算未经缩放的商和从最终的中间分子和分母的比例因子来终止点积单位链。

    Frequency-domain subchannel transmit antenna selection and power pouring for multi-antenna transmission
    4.
    发明申请
    Frequency-domain subchannel transmit antenna selection and power pouring for multi-antenna transmission 有权
    用于多天线传输的频域子信道发射天线选择和电力倾倒

    公开(公告)号：US20050113041A1

    公开(公告)日：2005-05-26

    申请号：US10723215

    申请日：2003-11-26

    申请人： Michael Polley ,  Donald Shaver ,  Srinath Hosur ,  Eko Onggosanusi ,  Muhammad Ikram ,  Anand Dabak

    发明人： Michael Polley ,  Donald Shaver ,  Srinath Hosur ,  Eko Onggosanusi ,  Muhammad Ikram ,  Anand Dabak

    IPC分类号： H04B7/005 ,  H04B1/02

    CPC分类号： H04W52/42

    摘要： A system comprises a wireless device that communicates across a spectrum having a plurality of sub-channels. The wireless device comprises a plurality of antennas through which the wireless device communicates with another wireless device, wherein each antenna communicates with the other wireless device via an associated communication pathway. The wireless device further comprises sub-channel power analysis logic coupled to the antennas and adapted to determine which communication pathway has the highest communication quality on a sub-channel by sub-channel basis. The wireless device still further comprises diversity selection logic coupled to the sub-channel power analysis logic and adapted to determine a weighting vector for an associated antenna based on the communication quality, wherein the weighting vector specifies a relative transmission power for each sub-channel for the associated antenna.

    摘要翻译： 一种系统包括在具有多个子信道的频谱上进行通信的无线设备。 无线设备包括多个天线，无线设备通过多个天线与另一无线设备通信，其中每个天线经由相关联的通信路径与另一无线设备进行通信。 无线设备还包括耦合到天线的子信道功率分析逻辑，并且适于通过子信道来确定子信道上哪个通信路径具有最高通信质量。 无线设备还包括耦合到子信道功率分析逻辑的分集选择逻辑，并且适于基于通信质量来确定相关天线的加权矢量，其中加权向量规定每个子信道的相对发射功率，用于 相关天线。