公开(公告)号：US06549585B2

公开(公告)日：2003-04-15

申请号：US09767019

申请日：2001-01-22

申请人： Ayman F. Naguib ,  Nambirajan Seshadri

发明人： Ayman F. Naguib ,  Nambirajan Seshadri

IPC分类号： H04B702

CPC分类号： H04B1/71055 ,  H04B1/71057 ,  H04B7/0613 ,  H04B7/0669 ,  H04B7/0845 ,  H04B7/0857 ,  H04B7/12 ,  H04L1/04 ,  H04L1/0618 ,  H04L1/08

摘要： Block-encoded transmissions of a multi-antenna terminal unit are effectively detected in the presence of co-channel interfering transmissions from other multi-antenna terminal units, when the base station has a plurality of antennas, and interference cancellation is combined with maximum likelihood decoding. The signals received in one base station antenna are employed in processing the signals received in a second base station antenna so as to cancel the signals of one terminal unit, while decoding the signals transmitted by the other terminal unit. Zero-forcing and MMSE approaches are presented. In another embodiment of this invention the basic decoding approach is used to obtain an initial estimate for the symbols from each terminal. Assuming that the signals of the first terminal unit has been decoded correctly, the receiver employs this initial decoded signal of the first terminal unit to cancel their contribution to the signals received at the base station antennas while decoding the signals of the second terminal unit. This process is then repeated assuming that the signals of the second terminal unit has been decoded correctly, the receiver employs this initial decoded signal of the second terminal unit to cancel their contribution to the signals received at the base station antennas while decoding the signals of the first terminal unit. The above disclosed techniques are viable for any number K of terminal units concurrently transmitting over a given channel, where each terminal unit is using a space-time block code with N transmit antennas, and a base station has at least K receive antennas.

摘要翻译： 当基站具有多个天线时，在存在与其他多天线终端单元的同信道干扰传输的情况下，有效地检测多天线终端单元的块编码的传输，并且将干扰消除与最大似然解码 。 在一个基站天线中接收到的信号用于处理在第二基站天线中接收的信号，以便在解码由另一个终端单元发送的信号的同时取消一个终端单元的信号。 提出了零强制和MMSE方法。 在本发明的另一个实施例中，基本解码方法用于从每个终端获得符号的初始估计。 假设第一终端单元的信号已被正确地解码，则接收机采用该第一终端单元的该初始解码信号来消除其对在基站天线处接收到的信号的贡献，同时对第二终端单元的信号进行解码。 假设第二终端单元的信号已被正确地解码，则接收器重复该过程，接收机采用第二终端单元的该初始解码信号来消除它们对在基站天线接收的信号的贡献，同时对 第一个终端单元。 上述公开的技术对于通过给定信道同时发送的任何数量K的终端单元是可行的，其中每个终端单元正在使用具有N个发射天线的时空块码，并且基站具有至少K个接收天线。

公开(公告)号：US06178196B1

公开(公告)日：2001-01-23

申请号：US09149163

申请日：1998-09-04

申请人： Ayman F. Naguib ,  Nambirajan Seshadri

发明人： Ayman F. Naguib ,  Nambirajan Seshadri

IPC分类号： H04B1500

CPC分类号： H04B1/71055 ,  H04B1/71057 ,  H04B7/0613 ,  H04B7/0669 ,  H04B7/0845 ,  H04B7/0857 ,  H04B7/12 ,  H04L1/04 ,  H04L1/0618 ,  H04L1/08

摘要： Block-encoded transmissions of a multi-antenna terminal unit are effectively detected in the presence of co-channel interfering transmissions from other multi-antenna terminal units, when the base station has a plurality of antennas, and interference cancellation is combined with maximum likelihood decoding. The signals received in one base station antenna are employed in processing the signals received in a second base station antenna so as to cancel the signals of one terminal unit, while decoding the signals transmitted by the other terminal unit. Zero-forcing and MMSE approaches are presented. In another embodiment of this invention the basic decoding approach is used to obtain an initial estimate for the symbols from each terminal. Assuming that the signals of the first terminal unit has been decoded correctly, the receiver employs this initial decoded signal of the first terminal unit to cancel their contribution to the signals received at the base station antennas while decoding the signals of the second terminal unit. This process is then repeated assuming that the signals of the second terminal unit has been decoded correctly, the receiver employs this initial decoded signal of the second terminal unit to cancel their contribution to the signals received at the base station antennas while decoding the signals of the first terminal unit. The above disclosed techniques are viable for any number K of terminal units concurrently transmitting over a given channel, where each terminal unit is using a space-time block code with N transmit antennas, and a base station has at least K receive antennas.

摘要翻译： 当基站具有多个天线时，在存在与其他多天线终端单元的同信道干扰传输的情况下，有效地检测多天线终端单元的块编码的传输，并且将干扰消除与最大似然解码 。 在一个基站天线中接收到的信号用于处理在第二基站天线中接收的信号，以便在解码由另一个终端单元发送的信号的同时取消一个终端单元的信号。 提出了零强制和MMSE方法。 在本发明的另一个实施例中，基本解码方法用于从每个终端获得符号的初始估计。 假设第一终端单元的信号已被正确地解码，则接收机采用该第一终端单元的该初始解码信号来消除其对在基站天线处接收到的信号的贡献，同时对第二终端单元的信号进行解码。 假设第二终端单元的信号被正确地解码，则接收器重复该过程，接收机采用第二终端单元的该初始解码信号来消除其对在基站天线处接收的信号的贡献，同时对 第一个终端单元。 上述公开的技术对于通过给定信道同时发送的任何数量K的终端单元是可行的，其中每个终端单元正在使用具有N个发射天线的时空块码，并且基站具有至少K个接收天线。

公开(公告)号：US20130259168A1

公开(公告)日：2013-10-03

申请号：US13790570

申请日：2013-03-08

申请人： Ayman F. Naguib ,  Nambirajan Seshadri

发明人： Ayman F. Naguib ,  Nambirajan Seshadri

IPC分类号： H04B7/08

CPC分类号： H04L1/0618 ,  H04B1/71055 ,  H04B1/71057 ,  H04B7/0669 ,  H04B7/0891 ,  H04L1/08

摘要： Block-encoded transmissions of a multi-antenna terminal unit are effectively detected in the presence of co-channel interfering transmissions when the base station has a plurality of antennas, and interference cancellation is combined with maximum likelihood decoding. More specifically, the signals received at the base station antennas are combined in a linear combination that relates to the channel coefficients between the various transmitting terminal units and the base antennas. By selecting proper coefficients for the linear combination and choosing probable transmitted signals that minimize a minimum mean squared error function, the signals of the various terminal units are canceled when detecting the signal of a particular unit. In another embodiment of the invention, the basic approach is used to obtain an initial estimate of the signals transmitted by one terminal unit, and the contribution of those signals is removed from the received signals prior to detecting the signals of other terminal units.

摘要翻译： 当基站具有多个天线时，在存在同信道干扰传输的情况下有效地检测多天线终端单元的块编码的传输，并且将干扰消除与最大似然解码组合。 更具体地，在基站天线处接收的信号以与各个发送终端单元和基站天线之间的信道系数相关的线性组合组合。 通过选择线性组合的适当系数并选择最小化最小均方误差函数的可能发送信号，当检测到特定单元的信号时，各个终端单元的信号被消除。 在本发明的另一个实施例中，基本方法用于获得由一个终端单元发送的信号的初始估计，并且在检测到其它终端单元的信号之前，从接收到的信号中去除这些信号的贡献。

公开(公告)号：US20100124201A1

公开(公告)日：2010-05-20

申请号：US12396448

申请日：2009-03-02

申请人： Miguel Griot ,  Ayman F. Naguib

发明人： Miguel Griot ,  Ayman F. Naguib

IPC分类号： H04W36/00

CPC分类号： H04W36/06 ,  H04L5/0007 ,  H04L5/0096 ,  H04W36/38

摘要： Certain embodiments of the present disclosure provide a method for switching radio frequency (RF) carriers that serve communication between a base station (BS) and a mobile station (MS). The switching of carriers can be viewed as a handoff procedure between two different RF carriers within the same BS. A simplified handoff procedure for switching of RF carriers can be applied when the MS switches its physical connection from a primary RF carrier to a secondary RF carrier, as well as in the case when the BS decides to move the MS from one primary RF carrier to another primary RF carrier.

摘要翻译： 本公开的某些实施例提供了一种用于切换服务于基站（BS）和移动台（MS）之间的通信的射频（RF）载波的方法。 载波的切换可以被看作是在同一BS内的两个不同RF载波之间的切换过程。 当MS将其物理连接从主RF载波切换到次RF载波时，以及在BS决定将MS从一个主RF载波移动到另一主RF载波的情况下，可以应用用于RF载波切换的简化切换过程 另一个主要的射频载波。

公开(公告)号：US07623564B2

公开(公告)日：2009-11-24

申请号：US11836521

申请日：2007-08-09

申请人： Ayman F. Naguib

发明人： Ayman F. Naguib

IPC分类号： H04B1/00

CPC分类号： H04B1/71072 ,  H04B7/0615 ,  H04B7/0669 ,  H04B7/0697 ,  H04L1/0618 ,  H04L1/0631 ,  H04L1/0643

摘要： Information symbols are transmitted simultaneously on independent streams using the same spreading code but from different transmit antennas at the transmitter. These simultaneous data stream could be intended for the same user (and thereby the data rate for any particular user can be increased) or for different users (thereby increasing the system capacity). Each stream of data can belong to a different signal constellation and use a different channel code. At the receiver, a number of receive antennas equal to at least the number of multiple data streams is used to separate the different data streams. We consider two different cases. The first one when no transmit diversity is used (this case can also include the case when transmit diversity with simple antenna weighting is used) and the second when transmit diversity with space-time block coding is used.

摘要翻译： 在独立流上使用相同的扩展码同时发送信息符号，但是在发射机处不同的发射天线。 这些同时的数据流可以用于相同的用户（并且因此可以增加任何特定用户的数据速率）或者针对不同的用户（从而增加系统容量）。 数据流可以属于不同的信号星座并使用不同的信道码。 在接收机处，使用等于至少多个数据流的数量的多个接收天线来分离不同的数据流。 我们考虑两种不同的情况。 当不使用发射分集时，第一种（这种情况也可以包括使用简单天线加权的发射分集的情况），而当使用具有空时块编码的发射分集时的情况。

公开(公告)号：US06661856B1

公开(公告)日：2003-12-09

申请号：US09532149

申请日：2000-03-21

申请人： Arthur R. Calderbank ,  Hamid Jafarkhani ,  Ayman F. Naguib ,  Nambirajan Seshadri ,  Vahid Tarokh

发明人： Arthur R. Calderbank ,  Hamid Jafarkhani ,  Ayman F. Naguib ,  Nambirajan Seshadri ,  Vahid Tarokh

IPC分类号： H04L102

CPC分类号： H04L1/0618 ,  H04B7/0669 ,  H04B7/0845

摘要： The prior art teachings for encoding signals and transmitting them over a plurality of antennas are advanced by disclosing a method for encoding for any number of transmitting antennas. Also disclosed is a generalized approach for maximum likelihood decoding where a decision rule is formed for all of the transmitting antennas of a transmitter, and a decision is made in favor of the transmitted symbols the minimize the equation c i = arg ⁢   ⁢ min c ⁢ &LeftBracketingBar; R i - c &RightBracketingBar; 2 + ( - 1 + ∑ &LeftBracketingBar; h i , j &RightBracketingBar; 2 ) ⁢ &LeftBracketingBar; c &RightBracketingBar; 2 where R i = ∑ t = 1 n ⁢   ⁢ ∑ j = 1 m ⁢   ⁢ r t j ⁢ h ϵ t ⁡ ( i ) ⁢ j * ⁢ δ t ⁡ ( i ) rtj is the signal received at time interval t, at receiving antenna j, h*&egr;t(i)j is the complex conjugate of the channel transfer function between the transmitter antenna that is transmitting symbol ci and receiving antenna j, and &dgr;t(i) is the sign of symbol ci in time interval t.

摘要翻译： 通过公开用于编码任何数量的发射天线的方法，提出了用于对信号进行编码并通过多个天线发射它们的现有技术。 还公开了一种用于最大似然解码的广义方法，其中为发射机的所有发射天线形成决策规则，并且做出有利于所发送的符号的决定使得最小化方程式，其中rt是在时间接收的信号 间隔t，在接收天线j，h * epsilont（i）j是传输符号ci和接收天线j的发射机天线之间的信道传递函数的复共轭，并且（i）是时间上的符号ci的符号 间隔t。