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    Flexible bandwidth communication system and method using a common physical layer technology platform
    5.
    发明申请
    Flexible bandwidth communication system and method using a common physical layer technology platform 审中-公开
    灵活的带宽通信系统和方法采用通用物理层技术平台

    公开(公告)号：US20070002898A1

    公开(公告)日：2007-01-04

    申请号：US11452505

    申请日：2006-06-13

    申请人： Adrian Boariu ,  Prabodh Varshney

    发明人： Adrian Boariu ,  Prabodh Varshney

    IPC分类号： H04J3/22

    CPC分类号： H04L5/0007 ,  H04L5/0021 ,  H04L5/0064 ,  H04W48/08 ,  H04W72/085 ,  H04W88/06 ,  H04W88/10

    摘要： A method includes selecting one of a plurality of transmitter systems used to transmit data. Each transmitter system corresponds to one of a plurality of subbands. Each subband has a bandwidth and at least two of the subbands have different bandwidths. A physical layer technology is common to and used by each transmitter system to transmit on a respective subband. The selected transmitter system transmits the data. An apparatus includes a plurality of transmitter systems, each corresponding to one of a plurality of subbands. Each subband has a bandwidth and at least two of the subbands have different bandwidths. A physical layer technology is common to and used by each transmitter system to transmit on a respective subband. A controller is operable to select one of the transmitter systems to use to transmit data, and is operable to cause the selected transmitter system to transmit the data.

    摘要翻译： 一种方法包括选择用于发送数据的多个发射机系统之一。 每个发射机系统对应于多个子带中的一个。 每个子带具有带宽，并且至少两个子带具有不同的带宽。 物理层技术是每个发射机系统在相应子带上传输和共用的技术。 所选发射机系统发送数据。 一种装置包括多个发射机系统，每个发射机系统对应于多个子带中的一个。 每个子带具有带宽，并且至少两个子带具有不同的带宽。 物理层技术是每个发射机系统在相应子带上传输和共用的技术。 控制器可操作以选择用于发送数据的发射机系统中的一个，并且可操作以使所选择的发射机系统发送数据。

    Multiple-antenna partially coherent constellations for multi-carrier systems
    6.
    发明授权
    Multiple-antenna partially coherent constellations for multi-carrier systems 失效
    多载波系统的多天线部分相干星座

    公开(公告)号：US07173973B2

    公开(公告)日：2007-02-06

    申请号：US10699386

    申请日：2003-10-31

    申请人： Mohammad Jaber Borran ,  Prabodh Varshney ,  Jorma Lilleberg

    发明人： Mohammad Jaber Borran ,  Prabodh Varshney ,  Jorma Lilleberg

    IPC分类号： H04K1/10 ,  H04L27/28

    CPC分类号： H04L27/34 ,  H04L1/0625 ,  H04L1/0631 ,  H04L1/0656

    摘要： A multi-level space time signal constellation that is optimized for use with a multi-carrier, multi-path communication scheme includes points on a first level separated from points on a mutually exclusive second level by a minimum distance that is based on a conditional probability distribution, preferably a Kullback-Leibler (KL) distance. Points within one level may be separated by a Euclidean distance, but spherical levels are rotated relative to one another to maximize a minimum inter-level KL distance. A receiver uses pilot symbols to estimate the channels and two-stage symbol detection, determining in one stage the constellation level and in another stage the point in the level. The receiver calculates a likelihood function based on a conditional distribution which does not reduce to the Euclidean-based nearest-neighbor detector. A single stored constellation may be scaled based on received signal to noise ratio. Each constellation defines n=2M real dimensions, wherein M is the number of transmit antennas.

    摘要翻译： 优化用于多载波多路径通信方案的多级时空信号星座包括在相互排斥的第二级别上的点之间的第一级上的点与基于条件概率的最小距离的点 分布，最好是Kullback-Leibler（KL）距离。 一个级别内的点可以通过欧几里德距离分开，但是球面水平相对于彼此旋转以使最小跨越距离KL距离最大化。 接收机使用导频符号来估计信道和两级符号检测，在一个阶段中确定星座级别，在另一级中确定该级别中的点。 接收机基于不减少到基于欧几里德的最近邻检测器的条件分布来计算似然函数。 可以基于接收到的信噪比来缩放单个存储的星座。 每个星座定义n = 2M个实际维度，其中M是发射天线的数量。

    Partially coherent constellations for multiple-antenna systems
    9.
    发明授权
    Partially coherent constellations for multiple-antenna systems 失效
    多天线系统的部分相干星座

    公开(公告)号：US07889804B2

    公开(公告)日：2011-02-15

    申请号：US10671346

    申请日：2003-09-24

    申请人： Mohammad Jaber Borran ,  Ashutosh Sabharwal ,  Behnaam Aazhang ,  Prabodh Varshney

    发明人： Mohammad Jaber Borran ,  Ashutosh Sabharwal ,  Behnaam Aazhang ,  Prabodh Varshney

    IPC分类号： H04B7/02

    CPC分类号： H04L25/0202 ,  H04L1/0612 ,  H04L27/3427

    摘要： A signal constellation for a multiple input/multiple output (MIMO) communication system when channel knowledge at the receiver is imperfect includes at least two (n−1)-dimensional sub-constellations of points that together form an n-dimensional constellation, the number n representing real dimensions and n=2M where M is the number of transmit antennas. The n-dimensional spherical constellation may define a single sphere or a plurality of concentric subset spheres, and points between subsets are separated by a Kullback-Leibler distance rather than a Euclidian distance. Each sphere has sub-constellations that preferably are arranged in symmetric pairs that define equal numbers of points that lie in parallel planes, to allow recursive construction that minimizes computational complexity. An appropriate constellation may be chosen by ceasing a search once the optimum minimum distance stops increasing as a number of the concentric levels increases.

    摘要翻译： 当接收机的信道知识不完美时，用于多输入/多输出（MIMO）通信系统的信号星座包括一起形成n维星座的点的至少两（n-1）维子星座， n表示实际尺寸，n = 2M，其中M是发射天线的数量。 n维球形星座可以定义单个球体或多个同心子集球体，并且子集之间的点由Kullback-Leibler距离而不是欧几里得距离分开。 每个球体具有优选以对称对布置的子星座，其限定位于平行平面中的相等数量的点，以允许最小化计算复杂度的递归构造。 一旦适当的星座可以通过停止搜索，一旦最佳最小距离随着同心级数的增加而停止增加。

    Method and apparatus for increasing data rates in a wideband MC-CDMA telecommunication system
    10.
    发明授权
    Method and apparatus for increasing data rates in a wideband MC-CDMA telecommunication system 失效
    用于在宽带MC-CDMA电信系统中增加数据速率的方法和装置

    公开(公告)号：US07286603B2

    公开(公告)日：2007-10-23

    申请号：US10427694

    申请日：2003-05-01

    申请人： Prabodh Varshney ,  Hannu Vilpponen ,  Mohammad J. Borran

    发明人： Prabodh Varshney ,  Hannu Vilpponen ,  Mohammad J. Borran

    IPC分类号： H04L27/28

    CPC分类号： H04B7/2631

    摘要： A system and method for the efficient transmission of information in a code division multiple access (CDMA) wireless telecommunication system. To increase the rate of reliable transmission, an orthogonal frequency-division multiplexing (OFDM) scheme is implemented in a direct-spread CDMA network, this combination sometimes being referred to as multi-carrier CDMA (MC-CDMA). Information (such as voice and data), interspersed with a known pilot signal, is encoded and spread across the frequency domain, rather than the time domain as in traditional CDMA; the allowable transmission bandwidth is divided into a number of carriers. To achieve even larger transmission rates, the guardband between carriers is eliminated. To prevent interference, the number of pilot transmissions is reduced and a corresponding number of frequency bins at the border of an OFDM block are loaded with zeros. The receiver simply ignores these subcarriers when reconstructing the transmitted signal.

    摘要翻译： 一种用于在码分多址（CDMA）无线电信系统中有效传输信息的系统和方法。 为了提高可靠传输速率，在直扩CDMA网络中实现了正交频分复用（OFDM）方案，这种组合有时被称为多载波CDMA（MC-CDMA）。 散布有已知导频信号的信息（例如语音和数据）被编码并扩展到频域，而不是传统CDMA中的时域; 允许的传输带宽被划分为多个载波。 为了实现更大的传输速率，消除了载波之间的保护带。 为了防止干扰，导频传输的数量减少，并且在OFDM块的边界处的相应数量的频率仓被加载零。 当重建发射信号时，接收机简单地忽略这些子载波。