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    • 2. 发明授权
    • Code division multiple access system and method of operation with improved signal acquisition and processing
    • 码分多址系统和操作方法,具有改进的信号采集和处理
    • US06549565B1
    • 2003-04-15
    • US09455947
    • 1999-12-07
    • R. Michael BuehrerShang-Chieh Liu
    • R. Michael BuehrerShang-Chieh Liu
    • H04J1304
    • H04B1/7075H04B1/7105H04B1/71052H04B1/7115H04B2201/70707
    • 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.
    • 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。
    • 4. 发明授权
    • Base station system including parallel interference cancellation
processor
    • 基站系统包括并行干扰消除处理器
    • US6157847A
    • 2000-12-05
    • US342145
    • 1999-06-29
    • R. Michael BuehrerMark D. HahmShang-Chieh LiuSteven P. Nicoloso
    • R. Michael BuehrerMark D. HahmShang-Chieh LiuSteven P. Nicoloso
    • H04J13/04H04B1/10H04B1/12H04B7/04H04B7/155H04B7/24H04M1/00H04B15/00
    • H04B1/126
    • 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.
    • 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。
    • 6. 发明授权
    • Methods and apparatus for downlink diversity in CDMA using Walsh codes
    • US06515978B1
    • 2003-02-04
    • US09294661
    • 1999-04-19
    • R. Michael BuehrerRobert Atmaram SoniJiann-An Tsai
    • R. Michael BuehrerRobert Atmaram SoniJiann-An Tsai
    • H03D100
    • H04B1/7103H04B1/707H04B7/0613H04B2201/709709H04J13/0048H04J13/0077H04J13/18H04L1/06H04L1/0618
    • 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.
    • 7. 发明授权
    • Symmetric sweep phase sweep transmit diversity
    • 对称扫描相位扫描发射分集
    • US06920314B2
    • 2005-07-19
    • US09918392
    • 2001-07-30
    • Roger David BenningR. Michael BuehrerPaul Anthony PolakosRobert Atmaram Soni
    • Roger David BenningR. Michael BuehrerPaul Anthony PolakosRobert Atmaram Soni
    • H04B7/06A04B1/02
    • H04B7/0669H04B7/0678
    • 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.
    • 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