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1.发明授权公开(公告)号：US07359466B2
公开(公告)日：2008-04-15
申请号：US09938453
申请日：2001-08-24
IPC分类号： H04B1/10
CPC分类号： H04L25/03012 , H04B1/707 , H04B7/0891 , H04L1/06 , H04L25/0242 , H04L25/03331 , H04L2025/03605 , H04L2025/03617
摘要： In a MIMO system the bit error rate floor caused by time dispersion is reduced by employing a joint minimum mean square error (MMSE) equalizer for all of the respective transmit antenna—receive antenna pairings that are possible in the MIMO system. The resulting joint equalization compensates not only for the impact of the channel on the transmit antenna—receive antenna pairings but also for the interference of the other transmit antennas on any given receive antenna. The joint equalization outperforms simply replicating the prior art minimum mean square error (MMSE) equalizer for each transmit antenna—receive antenna pairings.
摘要翻译： 在MIMO系统中，通过对MIMO系统中可能的所有相应的发射天线 - 接收天线配对采用联合最小均方误差（MMSE）均衡器来降低由时间色散引起的误比特率底层。 所产生的联合均衡不仅补偿了信道对发射天线 - 接收天线配对的影响，而且补偿了其他发射天线在任何给定的接收天线上的干扰。 联合均衡优于简单地复制现有技术的每个发射天线 - 接收天线配对的最小均方误差（MMSE）均衡器。
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公开(公告)号：US06301293B1
公开(公告)日：2001-10-09
申请号：US09129479
申请日：1998-08-04
IPC分类号： H04K100
CPC分类号： H04B1/71055 , H04B1/7093 , H04B1/7103 , H04B1/7115
摘要： Linear space-time multiuser detectors are described that combine array processing, rake detection, and multiuser detection and that satisfy a minimum mean-squared error criteria. Both embodiments can be implemented adaptively so as to account for unknown sources of interference. The adaptive implementation of the first embodiment of a linear space-time detector requires explicit estimates of the channel coefficients. On the other hand, the adaptive implementation of the second embodiment does not require these estimates since they can be adaptively obtained. Both of these detectors provide significant performance advantages over single-user space-time detectors and over multiuser detectors which do not account for CDMA interference from unknown sources.
摘要翻译： 描述了组合阵列处理，耙检测和多用户检测并且满足最小均方误差准则的线性时空多用户检测器。 可以自适应地实施两个实施例，以便考虑未知的干扰源。 线性时空检测器的第一实施例的自适应实现需要对信道系数的显式估计。 另一方面，第二实施例的自适应实现不需要这些估计，因为它们可以被自适应地获得。 这两个检测器都比单用户空间时间检测器和多用户检测器提供了显着的性能优势，这些检测器不考虑来自未知来源的CDMA干扰。
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3.发明授权公开(公告)号：US06373832B1
公开(公告)日：2002-04-16
申请号：US09108775
申请日：1998-07-02
IPC分类号： H04B7216
CPC分类号： H04B7/0671
摘要： A system, a transceiver, and methods for code division multiple access (CDMA) communication. The system includes first and second code division multiple access transceivers. The first code division multiple access transceiver has a plurality antennas disposed to provide transmission via a plurality of paths and the second code division multiple access transceiver has a rake arrangement for processing a plurality of signals received at the rake arrangement with differing delays or other characteristics. A driving arrangement is provided for causing the first code division multiple access transceiver to use a relative few, e.g., one, of the plurality of antennas. When, however, an indication is obtained that an adequate number of resolvable signals are likely not received at the rake arrangement of the second transceiver, a circuit switches the driving arrangement to cause the first transceiver to use more of the plurality of antennas. In one implementation, the second transceiver sends a feedback signal indicating the number of useful signals being received and the first transceiver responds to the feedback signal by selecting and using a desirable number of transmit antennas. In an implementation suitable for a time-division duplexing (TDD) communication system, the first transceiver obtains the indication by inference from the fact that it is not receiving an adequate plurality of resolvable signals from the second transceiver. When the first transceiver obtains the indication, it drives the increased number of antennas either with respective delays or with different codes of the CDMA type.
摘要翻译： 一种用于码分多址（CDMA）通信的系统，收发机和方法。 该系统包括第一和第二码分多址收发器。 第一码分多址收发器具有设置成经由多个路径提供传输的多个天线，并且第二码分多址收发器具有用于处理具有不同延迟或其他特性的在前置放置处接收的多个信号的前置放置装置。 提供驱动装置，用于使第一码分多址收发器使用多个天线中相对较少的例如一个天线。 然而，当获得在第二收发器的前置放置时可能没有接收到足够数量的可解析信号的指示时，电路切换驱动装置以使得第一收发器使用多个天线中的更多的天线。 在一个实现中，第二收发器发送指示正在接收的有用信号的数量的反馈信号，并且第一收发器通过选择和使用期望数量的发射天线来响应于反馈信号。 在适用于时分双工（TDD）通信系统的实施例中，第一收发机从不从第二收发器接收到足够多的可解析信号的事实通过推断获得指示。 当第一收发器获得指示时，它以相应的延迟或CDMA类型的不同码来驱动增加的天线数量。
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4.发明授权Methods and apparatus for reducing cochannel interference in a mixed-rate communication system 有权用于减少混合速率通信系统中的同信道干扰的方法和装置公开(公告)号：US06188718B1
公开(公告)日：2001-02-13
申请号：US09138465
申请日：1998-08-21
IPC分类号： H04B110
CPC分类号： H04W52/267 , H04B1/7107
摘要： A method and apparatus for increasing system capacity in a mixed-rate wireless communication are disclosed. Improvements are obtained using multiuser detection or antenna array processing techniques or both to explicitly cancel or attenuate only the high power users. Multiuser detection may be combined with antenna array processing to recover capacity appropriated by the high-power users. By mitigating the interference effects of only the high-powered users, the computational burden is manageable. An antenna array algorithm or a multiuser detection algorithm or both, are applied only to n high rate users (n
摘要翻译： 公开了一种用于在混合速率无线通信中增加系统容量的方法和装置。 使用多用户检测或天线阵列处理技术或者仅仅显式地取消或衰减高功率用户来获得改进。 多用户检测可以与天线阵列处理相结合，以恢复高功率用户所适用的容量。 通过减轻只有大功率用户的干扰影响，计算负担是可控的。 天线阵列算法或多用户检测算法或两者都仅应用于n个高速率用户（n
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5.发明授权Method and apparatus for achieving data rate variability in orthogonal spread spectrum communication systems 失效在正交扩频通信系统中实现数据速率变化的方法和装置公开(公告)号：US06366588B1
公开(公告)日：2002-04-02
申请号：US09032166
申请日：1998-02-27
IPC分类号： H04J316
CPC分类号： H04J13/0048 , H04J13/18
摘要： A CDMA communication system is disclosed offering a near continuum of data rates up to a maximum rate. The disclosed CDMA communication system increases the data rate variability, without disturbing the orthogonality between users. An increased number of data rates is obtained by time multiplexing the data rates achievable with conventional CDMA systems to provide additional data rates for various multimedia applications. If a user is assigned a specific orthogonal code sequence, such as a Walsh sequence, which permits a maximum data rate, nR, with conventional systems, the user can obtain additional desired data rates up to the maximum rate nR, by time multiplexing the specific orthogonal code set. Desired bit rates are achievable for applications requiring bit rates that are not an integer multiple of the rates provided by conventional techniques. A fundamental rate of R or “fat pipe” rates of powers-of-two multiples of the fundamental rate can be achieved in a conventional manner. A desired rate up to the maximum “fat pipe” rate is achieved by time multiplexing the codes wkn to achieve rates between R and nR, where wkn, denotes the first nth of the spread spectrum code wk. The transmitter of the present invention achieves a rate conversion to match the appropriate codeword to the appropriate data rate, by employing buffering and reclocking of the data, with time multiplexing of the orthogonal Walsh codes corresponding to the available lower and upper rates. The rate conversion must be synchronized with the selection of the orthogonal Walsh code (corresponding to the lower and upper rates).
摘要翻译： 公开了一种CDMA通信系统，其提供高达最大速率的几乎连续的数据速率。 所公开的CDMA通信系统增加数据速率变化性，而不会干扰用户之间的正交性。 通过对传统CDMA系统可实现的数据速率进行时间复用来获得数据速率的增加，以提供各种多媒体应用的附加数据速率。 如果向用户分配特定正交码序列，例如沃尔什序列，其允许与传统系统的最大数据速率nR，则用户可以通过时间复用特定的数据速率来获得最大速率nR的附加期望数据速率 正交码集。 要求比特率不是常规技术提供的速率的整数倍的应用的所需比特率是可以实现的。 基本速率的基本速率可以通过常规方式实现。 通过对代码wkn进行时分复用以实现R和nR之间的速率来实现达到最大“胖管”速率的期望速率，其中wkn表示扩频码wk的第n个。 本发明的发射机通过采用与可用的较低和较高速率对应的正交沃尔什码的时间复用，通过采用数据的缓冲和重新锁定来实现速率转换，以使适当的码字与适当的数据速率匹配。 速率转换必须与正交沃尔什码的选择（对应于较低和较高速率）同步。
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6.发明授权Method and apparatus for determining an inverse square root of a given positive-definite hermitian matrix 有权用于确定给定正定密度矩阵的反平方根的方法和装置公开(公告)号：US07200631B2
公开(公告)日：2007-04-03
申请号：US10340575
申请日：2003-01-10
CPC分类号： G06F17/16 , H04L25/03299
摘要： Generally, a method and apparatus are provided for computing a matrix inverse square root of a given positive-definite Hermitian matrix, K. The disclosed technique for computing an inverse square root of a matrix may be implemented, for example, by the noise whitener of a MIMO receiver. Conventional noise whitening algorithms whiten a non-white vector, X, by applying a matrix, Q, to X, such that the resulting vector, Y, equal to Q·X, is a white vector. Thus, the noise whitening algorithms attempt to identify a matrix, Q, that when multiplied by the non-white vector, will convert the vector to a white vector. The disclosed iterative algorithm determines the matrix, Q, given the covariance matrix, K. The disclosed matrix inverse square root determination process initially establishes an initial matrix, Q0, by multiplying an identity matrix by a scalar value and then continues to iterate and compute another value of the matrix, Qn+1, until a convergence threshold is satisfied. The disclosed iterative algorithm only requires multiplication and addition operations and allows incremental updates when the covariance matrix, K, changes.
摘要翻译： 通常，提供了一种用于计算给定正定Hermitian矩阵K的矩阵逆平方根的方法和装置。用于计算矩阵的逆平方根的所公开的技术可以例如由 MIMO接收机。 常规的噪声增白算法通过向X施加矩阵Q来使非白矢量X变白，从而得到的等于Q.X的矢量Y为白色矢量。 因此，噪声美白算法尝试识别矩阵Q，当乘以非白色矢量时，将将矢量转换为白色矢量。 所公开的迭代算法在给定协方差矩阵K的情况下确定矩阵Q.所公开的矩阵逆平方根确定过程通过将单位矩阵乘以标量值来初始建立起始矩阵Q 0> 0 < 然后继续迭代并计算矩阵Q N + 1 + 1的另一个值，直到满足收敛阈值。 所公开的迭代算法仅需要乘法和加法运算，并且当协方差矩阵K改变时允许增量更新。
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7.发明授权公开(公告)号：US06697435B2
公开(公告)日：2004-02-24
申请号：US10101697
申请日：2002-03-21
IPC分类号： H03M730
CPC分类号： H04L1/0071 , H04L1/004 , H04L1/0078
摘要： In order to transmit variable length encoded data in low signal to noise ratio environments, a first data pattern is added to a beginning portion of encoded data to signify a beginning of the encoded data. Further, a second data pattern is added to end portion of the encoded data to signify and end of the encoded data. Additionally, since the encoded data may naturally include the second data pattern and thereby mistakenly indicate an end of the encoded data, the encoded data is first checked for such a pattern. If the pattern is found within the encoded data, a new pattern is substituted therefore. In order to counter errors, patterns similar to the first data pattern are also substituted with new patterns. As such, a variable length encoded data can be transmitted in a low signal to noise ratio environment, and can thereafter be easily decoded.
摘要翻译： 为了在低信噪比环境中发送可变长度编码数据，将第一数据模式添加到编码数据的开始部分，以表示编码数据的开始。 此外，将第二数据模式添加到编码数据的结束部分以表示和结束编码数据。 此外，由于编码数据可能自然地包括第二数据模式，从而错误地指示编码数据的结束，所以首先检查编码数据的这种模式。 如果在编码数据中找到模式，则会替换新的模式。 为了对抗错误，类似于第一个数据模式的模式也被新的模式所取代。 因此，可变长度编码数据可以在低信噪比环境中传输，并且此后可以容易地解码。
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公开(公告)号：US06563879B1
公开(公告)日：2003-05-13
申请号：US09312711
申请日：1999-05-17
IPC分类号： H03M730
CPC分类号： H04L1/0071 , H04L1/004 , H04L1/0078
摘要： In order to transmit variable length encoded data in low signal to noise ratio environments, a first data pattern is added to a beginning portion of encoded data to signify a beginning of the encoded data. Further, a second data pattern is added to end portion of the encoded data to signify and end of the encoded data. Additionally, since the encoded data may naturally include the second data pattern and thereby mistakenly indicate an end of the encoded data, the encoded data is first checked for such a pattern. If the pattern is found within the encoded data, a new pattern is substituted therefore. In order to counter errors, patterns similar to the first data pattern are also substituted with new patterns. As such, a variable length encoded data can be transmitted in a low signal to noise ratio environment, and can thereafter be easily decoded.
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9.发明授权Equalizer and method for performing equalization in a wireless communications system 有权用于在无线通信系统中执行均衡的均衡器和方法公开(公告)号：US07167507B2
公开(公告)日：2007-01-23
申请号：US10185747
申请日：2002-07-01
IPC分类号： H04K1/00
CPC分类号： H04L1/0066 , H04B1/709 , H04B1/7097 , H04L1/0001 , H04L1/0071 , H04L1/0618 , H04L1/1812 , H04L25/03038 , H04L2025/03401 , H04L2025/0342 , H04L2025/03605 , H04L2025/03611
摘要： A receiver, system, and method for performing equalization. The receiver includes a multi-channel chip equalizer for receiving a plurality of receive baseband signals and restoring chip pulse shapes of a plurality of transmit baseband signals transmitted by a plurality of transmit antenna to produce a plurality of equalized output streams and a correlator for correlating the plurality of equalized output streams with a correlation signal to reduce gradient noise in the plurality of equalized output streams. The method of equalizing includes receiving a plurality of receive baseband signals and restoring chip pulse shapes of a plurality of transmit baseband signals transmitted by a plurality of transmit antenna to produce a plurality of equalized output streams and correlating the plurality of equalized output streams with a correlation signal to reduce gradient noise in the plurality of equalized output streams.
摘要翻译： 用于执行均衡的接收机，系统和方法。 接收机包括：多通道码片均衡器，用于接收多个接收基带信号，并且恢复多个发射天线发射的多个发射基带信号的码片脉冲形状，以产生多个均衡的输出流;以及相关器， 多个具有相关信号的均衡输出流，以减少多个均衡输出流中的梯度噪声。 均衡的方法包括接收多个接收基带信号并恢复由多个发射天线发送的多个发射基带信号的码片脉冲形状，以产生多个均衡的输出流，并将多个均衡的输出流与相关 信号以减少多个均衡输出流中的梯度噪声。
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