公开(公告)号：EP1087562A3

公开(公告)日：2003-05-14

申请号：EP00307627.0

申请日：2000-09-04

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Allpress, Stephen Alan ,  Buehrer, Michael R. ,  Quinn , Li ,  Ramesh, Nallepilli S. ,  Soni, Robert Atmaram

IPC: H04L1/06

CPC classification number: H04L1/0618

Abstract: Disclosed is a common transmitter architecture having incorporated both open loop transmit diversity schemes using a plurality of binary switches. Employment of binary switches allows for the sharing of certain components whether the transmitter is utilizing a orthogonal transmit diversity (OTD) scheme or a space time spreading (STS) scheme. Accordingly, the number of components in the transmitter is minimized and the complexity of the transmitter is simple enough to be implemented into a single application specific integrated chip.

公开(公告)号：EP1047218A2

公开(公告)日：2000-10-25

申请号：EP00303048.3

申请日：2000-04-11

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Buehrer, Michael R. ,  Soni, Robert Atmaram ,  Tsai, Jiann-an

IPC: H04L1/06 ,  H04B1/707

CPC classification number: H04B1/7103 ,  H04B1/707 ,  H04B7/0613 ,  H04B2201/709709 ,  H04J13/0048 ,  H04J13/0077 ,  H04J13/18 ,  H04L1/06 ,  H04L1/0618

Abstract: Downlink diversity in a CDMA system is provided by employing Walsh codes in conjunction with M transmit antennas at a common base station serving K mobiles, where M may or may not be to equal to K . The present invention provides methods and apparatus for improving downlink diversity in a CDMA system. Each transmit antenna transmits a signal representing the result of the modulation of Walsh codes by data signals for each of the K mobiles, assuming there is data pertaining to a particular mobile. The assignment of Walsh codes is accomplished in accordance with a transmission matrix T . The transmission matrix maps the user data symbols onto the Walsh codes for each antenna and is preferably designed such that its columns are representative of the transmit antennas and orthogonal. Thus, at a given mobile, the mobile need only correlate with M different Walsh codes since each transmit signal received contains a component that is the result of M different Walsh codes having been modulated by a data signal associated with that particular mobile. The set of Walsh codes to select from includes Walsh codes. However, with respect to any given mobile, there is needed only as many different Walsh codes as there are transmit antennas serving the particular mobile. The results of the respective M correlations are combined and, with obtained channel estimates, the receiver estimates the particular data pertaining to that particular mobile so that it can be provided to the user. Also, the present invention provides for various ways to estimate the respective channels between the M transmit antennas and a mobile. It is to be appreciated that the downlink diversity techniques of the invention may be applied to the physical layer proposed in the IS95-C physical layer draft proposal.

Abstract translation: CDMA系统中的下行链路分集通过在服务于K个移动台的公共基站处与M个发射天线结合使用Walsh码来提供，其中M可以或不等于K.本发明提供了用于改善下行链路分集的方法和装置 在CDMA系统中。 假设存在与特定移动站有关的数据，每个发射天线通过用于K个移动台中的每一个的数据信号来发送表示沃尔什码的调制结果的信号。 沃尔什码的分配根据传输矩阵T来完成。传输矩阵将用户数据符号映射到每个天线的沃尔什码上，并且优选地被设计为使得其列表示发射天线并且是正交的。 因此，在给定的移动站处，移动站仅需要与M个不同的沃尔什码相关，因为所接收的每个发送信号包含一个由与该特定移动站相关联的数据信号调制的M个不同沃尔什码的结果的分量。 选择的沃尔什码集合包括 - 沃尔什码。 然而，对于任何给定的移动站，仅需要与为特定移动站服务的发射天线一样多的不同沃尔什码。 组合相应的M个相关的结果，并且在获得的信道估计中，接收机估计与该特定移动站相关的特定数据，以便可以向用户提供。 此外，本发明提供了估计M个发射天线和移动台之间的相应信道的各种方式。 应当理解，本发明的下行链路分集技术可以应用于IS95-C物理层草案提案中提出的物理层。

公开(公告)号：EP1047218A3

公开(公告)日：2003-09-10

申请号：EP00303048.3

申请日：2000-04-11

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Buehrer, Michael R. ,  Soni, Robert Atmaram ,  Tsai, Jiann-an

IPC: H04L1/06 ,  H04B1/707

CPC classification number: H04B1/7103 ,  H04B1/707 ,  H04B7/0613 ,  H04B2201/709709 ,  H04J13/0048 ,  H04J13/0077 ,  H04J13/18 ,  H04L1/06 ,  H04L1/0618

Abstract: Downlink diversity in a CDMA system is provided by employing Walsh codes in conjunction with M transmit antennas at a common base station serving K mobiles, where M may or may not be to equal to K . The present invention provides methods and apparatus for improving downlink diversity in a CDMA system. Each transmit antenna transmits a signal representing the result of the modulation of Walsh codes by data signals for each of the K mobiles, assuming there is data pertaining to a particular mobile. The assignment of Walsh codes is accomplished in accordance with a transmission matrix T . The transmission matrix maps the user data symbols onto the Walsh codes for each antenna and is preferably designed such that its columns are representative of the transmit antennas and orthogonal. Thus, at a given mobile, the mobile need only correlate with M different Walsh codes since each transmit signal received contains a component that is the result of M different Walsh codes having been modulated by a data signal associated with that particular mobile. The set of Walsh codes to select from includes Walsh codes. However, with respect to any given mobile, there is needed only as many different Walsh codes as there are transmit antennas serving the particular mobile. The results of the respective M correlations are combined and, with obtained channel estimates, the receiver estimates the particular data pertaining to that particular mobile so that it can be provided to the user. Also, the present invention provides for various ways to estimate the respective channels between the M transmit antennas and a mobile. It is to be appreciated that the downlink diversity techniques of the invention may be applied to the physical layer proposed in the IS95-C physical layer draft proposal.

公开(公告)号：EP1047232A3

公开(公告)日：2002-01-02

申请号：EP00303271.1

申请日：2000-04-18

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Buehrer, Michael R. ,  Liu, Shang-Chieh ,  Nicoloso, Steven P. ,  Upteogrove, Dirck

IPC: H04L25/02

CPC classification number: H04L25/024

Abstract: The method of channel estimation determines linear regression coefficients for N blocks of a first signal component in a received signal on a block-by-block basis, and determines a channel estimate based on the linear regression coefficients for the N blocks. Using the channel estimate, channel distortion in a second signal component of the received signal can be significantly eliminated.

公开(公告)号：EP1107468A2

公开(公告)日：2001-06-13

申请号：EP00310516.0

申请日：2000-11-27

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Buehrer, Michael R. ,  Liu, Shang-Chieh

IPC: H04B1/707 ,  H04B7/08

CPC classification number: H04B1/7075 ,  H04B1/7105 ,  H04B1/71052 ,  H04B1/7115 ,  H04B2201/70707

Abstract: A Code Division Multiple Access system and method of operation provides reduced interference for received signals and improved signal acquisition and processing with reduced computational complexity. The system includes a base station coupled to an antenna array of at least two or more antennas and serving a plurality of users. A receiver in the base station includes a universal inverse cross-correlation matrix coupled to the antenna array, a signal acquisition and a signal processing circuit serving each user. Each signal acquisition circuit comprises a series of delay stages in which the incoming antenna signals in each stage are correlated with a spreading code and combined in a multiplier coupled to the universal inverse cross-correlation matrix which facilitates improved time delay estimation for signal acquisition. Each multiplier combines the correlated signals of the stage with the output of the universal inverse cross-correlation matrix to provide a signal amplitude representative of the signal energy in an antenna path for a given time period, with individual delays separated by a half of chip period. The amplitudes for each of the delay stages are captured in buffers which contain threshold information for selection of the strongest received signal. The signal processing circuit combines the strongest received signal with a channel estimate and the universal inverse matrix output in a multiplier to provide an output signal for demodulation and decoding with improved signal quality due to (a) reduced interference, (b) improved synchronization for signal acquisition and processing, and (c) the universal inverse cross-correlation matrix reducing computational complexity in signal acquisition and signal processing.

Abstract translation: 码分多址系统和操作方法为接收信号提供了降低的干扰，并且改善了信号采集和处理，同时降低了计算复杂度。 该系统包括耦合到至少两个或更多个天线的天线阵列并且服务于多个用户的基站。 基站中的接收机包括耦合到天线阵列的通用反向互相关矩阵，为每个用户服务的信号采集和信号处理电路。 每个信号采集电路包括一系列延迟级，其中每级中的输入天线信号与扩展码相关并且在与通用反向互相关矩阵耦合的乘法器中组合，这有助于改进信号采集的时延估计。 每个乘法器将级的相关信号与通用反向互相关矩阵的输出进行组合，以在给定时间段内提供表示天线路径中的信号能量的信号幅度，其中各个延迟分开半个码片周期 。 每个延迟级的幅度被捕获在包含用于选择最强接收信号的阈值信息的缓冲器中。 信号处理电路将最强的接收信号与信道估计和通用逆矩阵输出组合在乘法器中，以提供用于解调和解码的输出信号，由于（a）降低的干扰，（b）信号同步 采集和处理，以及（c）通用反向互相关矩阵，降低信号采集和信号处理中的计算复杂度。

公开(公告)号：EP1087562A2

公开(公告)日：2001-03-28

申请号：EP00307627.0

申请日：2000-09-04

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Allpress, Stephen Alan ,  Buehrer, Michael R. ,  Quinn , Li ,  Ramesh, Nallepilli S. ,  Soni, Robert Atmaram

IPC: H04L1/06

CPC classification number: H04L1/0618

Abstract: Disclosed is a common transmitter architecture having incorporated both open loop transmit diversity schemes using a plurality of binary switches. Employment of binary switches allows for the sharing of certain components whether the transmitter is utilizing a orthogonal transmit diversity (OTD) scheme or a space time spreading (STS) scheme. Accordingly, the number of components in the transmitter is minimized and the complexity of the transmitter is simple enough to be implemented into a single application specific integrated chip.

Abstract translation: 公开了一种共同的发射机架构，其结合了使用多个二进制开关的开环发射分集方案。 二进制交换机的使用允许某些组件的共享，无论发射机是利用正交发射分集（OTD）方案还是空间时间扩展（STS）方案。 因此，发射机中的组件数量被最小化，并且发射机的复杂性足够简单，可以实现到单个专用集成芯片中。

公开(公告)号：EP1085677B1

公开(公告)日：2007-07-11

申请号：EP00307633.8

申请日：2000-09-04

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Allpress, Stephen Alan ,  Buehrer, Michael R. ,  Soni, Robert Atmaram

IPC: H04B7/08 ,  H04L1/06

CPC classification number: H04B7/0854 ,  H04L1/06 ,  H04L1/0618

公开(公告)号：EP1282244A1

公开(公告)日：2003-02-05

申请号：EP02250953.3

申请日：2002-02-12

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Benning, Roger David ,  Buehrer, Michael R. ,  Polakos, Paul Anthony ,  Soni, Robert Atmaram

IPC: H04B7/06

CPC classification number: H04B7/0669 ,  H04B7/0678

Abstract: Described herein is a method and apparatus for transmission that provides the performance of space time spreading (STS) or orthogonal transmit diversity (OTD) and the backwards compatibility of phase sweep transmit diversity (PSTD) without degrading performance of either STS or PSTD using a symmetric sweep PSTD transmission architecture. In one embodiment, a pair of signals s 1 and s 2 are split into signals s 1 (a) and s 1 (b) and signals s 2 (a) and s 2 (b), respectively. Signal s 1 comprises a first STS/OTD signal belonging to an STS/OTD pair, and signal s 2 comprises a second STS/OTD signal belonging to the STS/OTD pair. Signals s 1 (b) and s 2 (b) are phase swept using a pair of phase sweep frequency signals that would cancel out any self induced interference. For example, the pair of phase sweep frequency signals utilize a same phase sweep frequency with one of the phase sweep frequency signals rotating in the opposite direction plus an offset of π relative to the other phase sweep frequency signal. The resultant phase swept signals s 1 (b) and s 2 (b) are added to signals s 2 (a) and s 1 (a) before being amplified and transmitted.

Abstract translation: 这里描述了一种用于传输的方法和装置，其提供空间时间扩展（STS）或正交发射分集（OTD）的性能以及相位扫描发送分集（PSTD）的向后兼容性，而不会降低使用对称的STS或PSTD的性能 扫描PSTD传输架构。 在一个实施例中，一对信号s1和s2分别被分成信号s1（a）和s1（b）和信号s2（a）和s2（b）。 信号s1包括属于STS / OTD对的第一STS / OTD信号，信号s2包括属于STS / OTD对的第二STS / OTD信号。 信号s1（b）和s2（b）使用一对相位扫描频率信号进行相位扫描，这将消除任何自身的干扰。 例如，该对相位扫描频率信号利用相同的相位扫描频率，其中相位扫描频率信号之一相对于另一个相位扫描频率信号在相反方向上旋转，加上pi的偏移。 在放大和发送之前，将合成相位扫描信号s1（b）和s2（b）加到信号s2（a）和s1（a）上。

公开(公告)号：EP1065796A3

公开(公告)日：2002-10-30

申请号：EP00305207.3

申请日：2000-06-20

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Buehrer, Michael R. ,  Hahm, Mark D. ,  Liu, Shang-Chieh ,  Nicoloso, Steven P.

IPC: H04B1/707

CPC classification number: H04B1/126

Abstract: The base station system includes a cancellation processor connected to a plurality of conventional signal processors. Under the control of a controller, the signal processors acquire user signals in signals received by the base station antennas. The controller controls the cancellation processor to perform cancellation operations with respect to the acquired user signals. The cancellation processor includes first-nth filter stages. Each filter stage operates in the same manner. A filter stage obtains, in parallel, the acquired user signals from signals supplied thereto by estimating symbols in the acquired user signals under the control of the controller. The cancellation processor also includes a cancellation stage associated with each filter stage. Each cancellation stage cancels, in parallel, the obtained user signals output from the associated filter stage from the signals received by the base station antennas. The resulting residual signals output from a cancellation stage are supplied to the next filter stage, and the signals supplied to the first filter stage are the signals received by the base station antennas. A cancellation stage cancels the obtained user signals received thereby from the received signals at a substantially same time with respect to the received signals.

公开(公告)号：EP1047232A2

公开(公告)日：2000-10-25

申请号：EP00303271.1

申请日：2000-04-18

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Buehrer, Michael R. ,  Liu, Shang-Chieh ,  Nicoloso, Steven P. ,  Upteogrove, Dirck

IPC: H04L25/02

CPC classification number: H04L25/024

Abstract: The method of channel estimation determines linear regression coefficients for N blocks of a first signal component in a received signal on a block-by-block basis, and determines a channel estimate based on the linear regression coefficients for the N blocks. Using the channel estimate, channel distortion in a second signal component of the received signal can be significantly eliminated.

Abstract translation: 频率偏移估计器（10）产生频率偏移估计，其由频率偏移补偿器（12）使用以补偿接收信号的影响并且生成由信道估计器使用的已知和未知信号分量中的经补偿的接收符号 （14）以产生信道失真的估计。 补偿器（16）使用失真估计来补偿未知信号分量的经补偿的接收符号中的信道失真，并且窗口大小发生器（18）基于信道估计器（14）的线性回归系数自适应地生成窗口大​​小 ）。