专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US06542560B1 Method of channel estimation and compensation based thereon 有权
标题翻译：基于此的信道估计和补偿方法
公开(公告)号：US06542560B1
公开(公告)日：2003-04-01
申请号：US09296654
申请日：1999-04-23
申请人： R. Michael Buehrer , Shang-Chieh Liu , Steven P. Nicoloso , Dirck Uptegrove
发明人： R. Michael Buehrer , Shang-Chieh Liu , Steven P. Nicoloso , Dirck Uptegrove
IPC分类号： H04L100
CPC分类号： H04L25/024
摘要： 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.
摘要翻译：信道估计方法基于逐块地确定接收信号中的第一信号分量的N个块的线性回归系数，并且基于N个块的线性回归系数来确定信道估计。使用信道估计，可以显着地消除接收信号的第二信号分量中的信道失真。

2. 发明授权

US06614857B1 Iterative channel estimation and compensation based thereon 有权
标题翻译：基于迭代信道估计和补偿
公开(公告)号：US06614857B1
公开(公告)日：2003-09-02
申请号：US09296409
申请日：1999-04-23
申请人： R. Michael Buehrer , Shang-Chieh Liu , Steven P. Nicoloso
发明人： R. Michael Buehrer , Shang-Chieh Liu , Steven P. Nicoloso
IPC分类号： H04L2706
CPC分类号： H04L25/0236
摘要： The method of channel estimation generates an initial channel estimate from a pilot signal in a received signal, and estimates the data in the received signal using the channel estimate. An updated channel estimate is then obtained from the estimated data. This process of estimating the data and re-estimating the channel estimate is reiterated a desired number of times to refine the accuracy of the channel estimate.
摘要翻译：信道估计的方法从接收信号中的导频信号产生初始信道估计，并且使用信道估计来估计接收信号中的数据。然后从估计数据获得更新的信道估计。重复估计数据和重新估计信道估计的这个过程，以期提高信道估计的准确性所需的次数。

3. 发明授权

US6157847A Base station system including parallel interference cancellation processor 有权
标题翻译：基站系统包括并行干扰消除处理器
公开(公告)号：US6157847A
公开(公告)日：2000-12-05
申请号：US342145
申请日：1999-06-29
申请人： R. Michael Buehrer , Mark D. Hahm , Shang-Chieh Liu , Steven P. Nicoloso
发明人： R. Michael Buehrer , Mark D. Hahm , Shang-Chieh Liu , Steven P. Nicoloso
IPC分类号： H04J13/04 , H04B1/10 , H04B1/12 , H04B7/04 , H04B7/155 , H04B7/24 , H04M1/00 , H04B15/00
CPC分类号： H04B1/126
摘要： 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.
摘要翻译：基站系统包括连接到多个传统信号处理器的取消处理器。在控制器的控制下，信号处理器以基站天线接收的信号获取用户信号。控制器控制取消处理器对所获取的用户信号执行取消操作。取消处理器包括第n个滤波器级。每个过滤器阶段以相同的方式操作。滤波器级并行地通过在控制器的控制下估计获取的用户信号中的符号来获得来自所提供的信号的所获取的用户信号。取消处理器还包括与每个滤波器级相关联的取消级。每个取消阶段并行地从由基站天线接收的信号中取消从相关联的滤波器级输出的获得的用户信号。从消除级输出的残留信号被提供给下一个滤波级，提供给第一滤波级的信号是由基站天线接收的信号。消除阶段相对于接收到的信号在基本相同的时间从接收到的信号中取消所获得的用户信号。

4. 发明授权

US06801791B2 Cellular communications system and related methods 有权
标题翻译：蜂窝通信系统及相关方法
公开(公告)号：US06801791B2
公开(公告)日：2004-10-05
申请号：US09810694
申请日：2001-03-14
申请人： R. Michael Buehrer , Steven Peter Nicoloso , Robert Atmaram Soni , Dirck Uptegrove
发明人： R. Michael Buehrer , Steven Peter Nicoloso , Robert Atmaram Soni , Dirck Uptegrove
IPC分类号： H04M100
CPC分类号： H04B7/0615
摘要： A cellular communications system includes a base station and at least one mobile station communicating therewith. The base station may include a plurality of antennas and a modulator for providing a transmit signal for each antenna. The modulator may estimate a weighting factor for each transmit signal based upon considering each transmit signal as having an unknown and arbitrary fading factor associated therewith and based upon considering the unknown and arbitrary fading factors to have a predetermined cross-correlation function.
摘要翻译：蜂窝通信系统包括基站和与其通信的至少一个移动站。基站可以包括多个天线和用于为每个天线提供发射信号的调制器。基于将每个发射信号考虑为与其相关联的未知和任意衰落因子并且基于考虑未知和任意衰落因子以具有预定的互相关函数，调制器可以估计每个发射信号的加权因子。

5. 发明授权

US06363103B1 Multistage interference cancellation for CDMA applications using M-ary orthogonal moduation 失效
标题翻译：使用M-ary正交调制的CDMA应用的多级干扰消除
公开(公告)号：US06363103B1
公开(公告)日：2002-03-26
申请号：US09058065
申请日：1998-04-09
申请人： R. Michael Buehrer , Sridhar Gollamudi , Steven P. Nicoloso
发明人： R. Michael Buehrer , Sridhar Gollamudi , Steven P. Nicoloso
IPC分类号： H04L2730
CPC分类号： H04B1/71072
摘要： A multistage or parallel interference canceler (PIC) arrangement is disclosed for use in a communications system using code division multiple access (CDMA) with M-ary orthogonal modulation. All the M symbol waveforms, weighted according to their correlations with a despread signal, are combined to form a reconstructed symbol waveform for each user in each stage. The reconstructed symbol waveforms for all users are summed to form an estimated composite received signal having reduced interference which is subtracted from the composite received signal to generate a residual interference signal (RIS). While the total received signal is despread in the first stage of the PIC, the RIS or cancellation residue signal from the immediately preceding stage is used in succeeding stages of the PIC. A final decision is made by despreading the RIS from the final stage of the PIC, correlating it with the M symbol waveforms using an FHT. A weight vector from the final stage is then added to the output of the FHT. The real part or the squared magnitude of the resulting correlations, depending, respectively, on whether coherent or noncoherent demodulation is used, is then taken. The final symbol decision is made by selecting the symbol corresponding to the maximum component resulting decision statistic vector.
摘要翻译：公开了一种使用具有M进制正交调制的码分多址（CDMA）的通信系统中的多级或并联干扰消除器（PIC）装置。根据与去扩展信号的相关性加权的所有M个符号波形被组合以在每个阶段中为每个用户形成重构符号波形。将所有用户的重构符号波形相加以形成具有减小的干扰的估计复合接收信号，其从复合接收信号中减去以产生残留干扰信号（RIS）。虽然在PIC的第一级中解扩了总接收信号，但是在PIC的后续阶段使用来自紧接在前级的RIS或消除残留信号。最终决定通过从PIC的最后阶段解扩RIS，使用FHT将其与M个符号波形相关联。然后将来自最终级的权重向量加到FHT的输出中。然后，取决于相关或非相干解调的结果相关性的实部或平方幅度。通过选择对应于最大成分判定统计量向量的符号来进行最终符号判定。

6. 发明授权

US06549565B1 Code division multiple access system and method of operation with improved signal acquisition and processing 有权
标题翻译：码分多址系统和操作方法，具有改进的信号采集和处理
公开(公告)号：US06549565B1
公开(公告)日：2003-04-15
申请号：US09455947
申请日：1999-12-07
申请人： R. Michael Buehrer , Shang-Chieh Liu
发明人： R. Michael Buehrer , Shang-Chieh Liu
IPC分类号： H04J1304
CPC分类号： H04B1/7075 , H04B1/7105 , H04B1/71052 , H04B1/7115 , H04B2201/70707
摘要： 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.
摘要翻译：码分多址系统和操作方法提供了减少的接收信号干扰，并改进了信号采集和处理，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为多个用户服务的基站。基站中的接收机包括耦合到天线阵列的通用逆互相关矩阵，信号采集和为每个用户服务的信号处理电路。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，并且组合在耦合到通用逆互相关矩阵的乘法器中，这有助于改进用于信号采集的时间延迟估计。每个乘法器将该阶段的相关信号与通用逆互相关矩阵的输出相结合，以提供表示给定时间段内的天线路径中的信号能量的信号幅度，其中各个延迟与码片周期的一半相隔。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乘法器中的通用逆矩阵输出相结合，以提供用于解调和解码的输出信号，由于（a）减少的干扰，（b）提高信号的同步，改善了信号质量采集和处理，以及（c）通用逆互相关矩阵降低信号采集和信号处理中的计算复杂度。

7. 发明授权

US07042955B2 Space time spreading and phase sweep transmit diversity 有权
公开(公告)号：US07042955B2
公开(公告)日：2006-05-09
申请号：US09918391
申请日：2001-07-30
申请人： Roger David Benning , R. Michael Buehrer , Mark H Kraml , Paul Anthony Polakos
发明人： Roger David Benning , R. Michael Buehrer , Mark H Kraml , Paul Anthony Polakos
IPC分类号： H04B7/02 , H04B7/10 , H04B7/216
CPC分类号： H04B7/12 , H04W52/42
摘要： 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 significantly degrading performance in additive white guassan noise (AWGN) conditions using a transmission architecture that incorporates STS/OTD and a form of phase sweep transmit diversity (PSTD) referred to herein as biased PSTD, which involves transmitting a signal and a frequency swept version of the same signal over diversity antennas at different power levels to reduce the depths of nulls normally seen in AWGN conditions when regular PSTD is utilized.

8. 发明授权

US06515978B1 Methods and apparatus for downlink diversity in CDMA using Walsh codes 有权
公开(公告)号：US06515978B1
公开(公告)日：2003-02-04
申请号：US09294661
申请日：1999-04-19
申请人： R. Michael Buehrer , Robert Atmaram Soni , Jiann-An Tsai
发明人： R. Michael Buehrer , Robert Atmaram Soni , Jiann-An Tsai
IPC分类号： H03D100
CPC分类号： H04B1/7103 , H04B1/707 , H04B7/0613 , H04B2201/709709 , H04J13/0048 , H04J13/0077 , H04J13/18 , H04L1/06 , H04L1/0618
摘要： 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 2┌log2(K)┐ 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.

9. 发明授权

US06920314B2 Symmetric sweep phase sweep transmit diversity 失效
标题翻译：对称扫描相位扫描发射分集
公开(公告)号：US06920314B2
公开(公告)日：2005-07-19
申请号：US09918392
申请日：2001-07-30
申请人： Roger David Benning , R. Michael Buehrer , Paul Anthony Polakos , Robert Atmaram Soni
发明人： Roger David Benning , R. Michael Buehrer , Paul Anthony Polakos , Robert Atmaram Soni
IPC分类号： H04B7/06 , A04B1/02
CPC分类号： H04B7/0669 , H04B7/0678
摘要： 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 s1 and s2 are split into signals s1(a) and s1(b) and signals s2(a) and s2(b), respectively. Signal s1 comprises a first STS/OTD signal belonging to an STS/OTD pair, and signal s2 comprises a second STS/OTD signal belonging to the STS/OTD pair. Signals s1(b) and s2(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 s1(b) and s2(b) are added to signals s2(a) and s1(a) before being amplified and transmitted.
摘要翻译：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射分集（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s 1和s 2 2被分割成信号s 1（a）和s 1 < （b）和信号s 2（a）和s 2（b）。信号S1 <1>包括属于STS / OTD对的第一STS / OTD信号，信号s 2包括属于STS / OTD对的第二STS / OTD信号。使用一对可以消除任何自身干扰的相位扫描频率信号来相位扫描信号s 1（b）和s 2（b）。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中的一个相反方向旋转加上相对于另一个相位扫描频率信号的pi偏移。所得到的相位扫描信号s 1（b）和s 2（b）被加到信号s2（a）和s

10. 发明授权

US06317410B1 Receiver architecture employing space time spreading and orthogonal transmit diversity techniques 有权
标题翻译：采用时空扩展和正交发射分集技术的接收机架构
公开(公告)号：US06317410B1
公开(公告)日：2001-11-13
申请号：US09395325
申请日：1999-09-13
申请人： Stephen Alan Allpress , R. Michael Buehrer , Robert Atmaram Soni
发明人： Stephen Alan Allpress , R. Michael Buehrer , Robert Atmaram Soni
IPC分类号： H04J1100
CPC分类号： H04B7/0854 , H04L1/06 , H04L1/0618
摘要： Disclosed is a receiver 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 receiver is utilizing a orthogonal transmit diversity (OTD) scheme or a space time spreading (STS) scheme. Accordingly, the number of components in the receiver is minimized and the complexity of the receiver is simple enough to be implemented into a single application specific integrated chip.
摘要翻译：公开了一种使用多个二进制开关并入两个开环发射分集方案的接收机发射机架构。二进制交换机的使用允许某些组件的共享，无论接收机是使用正交发射分集（OTD）方案还是空间时间扩展（STS）方案。因此，接收机中的组件数量被最小化，并且接收机的复杂性足够简单以被实现到单个专用集成芯片中。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式