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公开(公告)号：US07894402B2
公开(公告)日：2011-02-22
申请号：US11106627
申请日：2005-04-15
IPC分类号： H04B7/216
CPC分类号： H04B7/0632 , H04B7/0491 , H04L1/0002 , H04L1/0025 , H04W52/40 , H04W52/50
摘要： Spatial Division Multiple Access (SDMA) may be implemented in both the forward and reverse link directions through the use of, for example, a sector-wide primary pilot channel and one or more beamformed secondary pilot channels (secondary pilot channel).
摘要翻译： 可以通过使用例如扇区的主导频信道和一个或多个波束形成的次级导频信道（次级导频信道）来在前向和反向链路方向上实现空分多址（SDMA）。
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公开(公告)号：US07538740B2
公开(公告)日：2009-05-26
申请号：US11368551
申请日：2006-03-06
IPC分类号： H01Q21/00
摘要： An antenna array includes four closely spaced, linearly arranged antenna columns. At least two of the columns, e.g., the center two columns, are dual-polarized. Spacing between neighboring columns is about ½λ, where λ is the free space wavelength at the network carrier frequency. Each column includes a first vertical linear array of radiating elements or groups of elements (sub-arrays) connected to a port. The dual-polarized columns each further include a second linear array of radiating elements oriented at a different polarization than the first array. (For example, horizontal/vertical or slant 45°.) Array ports are connected with four RF feed cables using duplexers in such a way so as to provide two different antenna configurations for forward link and reverse link frequencies, namely, a four-column closely spaced beam-forming array at the forward link and a two-column dual-polarized array at the reverse link for 4-branch diversity reception.
摘要翻译： 天线阵列包括四个紧密间隔的线性排列的天线柱。 至少两列，例如中心两列，是双极化的。 相邻列之间的间距约为1/2，其中λ是网络载波频率处的自由空间波长。 每列包括连接到端口的辐射元件或元件组（子阵列）的第一垂直线性阵列。 双极化柱每个还包括以与第一阵列不同的偏振定向的辐射元件的第二线性阵列。 （例如，水平/垂直或倾斜45°）。阵列端口使用双工器以四个RF馈电电缆连接，以便为前向链路和反向链路频率提供两种不同的天线配置，即四列 在前向链路处的紧密间隔的波束形成阵列和用于4分支分集接收的反向链路处的两列双极化阵列。
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公开(公告)号：US20090047984A1
公开(公告)日：2009-02-19
申请号：US12216005
申请日：2008-06-27
CPC分类号： H04W72/048 , H04W64/006 , H04W72/0486 , H04W72/085
摘要： One of a plurality of carrier frequencies may be selected as a serving carrier for an uplink transmission based on at least one of a mobile velocity and loading conditions of the plurality of carrier frequencies. Selection of the serving carrier favors a carrier frequency having a smaller loading than at least one other carrier frequency based on the loading conditions. Also, selection of the serving carrier favors a lower frequency carrier for a higher mobile velocity and favors a higher frequency carrier for a lower mobile velocity based on the mobile velocity.
摘要翻译： 可以基于多个载波频率的移动速度和负载条件中的至少一个来选择多个载波频率中的一个作为用于上行链路传输的服务载波。 基于负载条件，服务运营商的选择有利于具有比至少一个其他载波频率更小的负载的载波频率。 此外，服务载波的选择有利于更高的移动速度的较低频率载波，并且基于移动速度有利于较低移动速度的较高频率载波。
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公开(公告)号：US06980778B2
公开(公告)日：2005-12-27
申请号：US09918086
申请日：2001-07-30
CPC分类号： H04B7/0669 , H04B7/0678
摘要： Disclosed is a method and apparatus of transmit diversity that is backward compatible and does not degrade performance using a transmission architecture that incorporates a form of phase sweep transmit diversity (PSTD) referred to herein as split shift PSTD. Split shift PSTD involves transmitting at least two phase swept versions of a signal over diversity antennas, wherein the two phase swept versions of the signal have a different phase. The phase sweep frequency signals may have a fixed or varying phase shifting rate, may have an identical or different phase shifting rate, may be offset from each other and/or may be phase shifting in the same or opposite direction.
摘要翻译： 公开了一种发射分集的方法和装置，其是向后兼容的并且不会使用包含这里称为分离移位PSTD的相位扫描发射分集（PSTD）形式的传输架构来降低性能。 分离移位PSTD涉及通过分集天线发射信号的至少两个相位扫描版本，其中信号的两相扫描版本具有不同的相位。 相位扫描频率信号可以具有固定或变化的相移速率，可以具有相同或不同的相移速率，可以彼此偏移和/或可以在相同或相反的方向上相移。
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5.发明授权Transmitter architecture employing space time spreading and orthogonal transmit diversity techniques 有权采用时空扩展和正交发射分集技术的发射机架构公开(公告)号：US06392988B1
公开(公告)日：2002-05-21
申请号：US09394172
申请日：1999-09-13
申请人： Stephen Alan Allpress , R. Michael Buehrer , Quinn Li , Nallepilli S. Ramesh , Robert Atmaram Soni
发明人： Stephen Alan Allpress , R. Michael Buehrer , Quinn Li , Nallepilli S. Ramesh , Robert Atmaram Soni
IPC分类号： H04J1100
CPC分类号： H04L1/0618
摘要： 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.
摘要翻译： 公开了一种共同的发射机架构，其结合了使用多个二进制交换机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以被实现到单个专用集成芯片中。
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6.发明授权Method and system for encoding data using rate-compatible irregular LDPC codes based on edge growth and parity splitting 有权基于边缘增长和奇偶分裂的使用速率兼容的不规则LDPC码对数据进行编码的方法和系统公开(公告)号：US07966548B2
公开(公告)日：2011-06-21
申请号：US11824408
申请日：2007-06-29
申请人： Noah Jacobsen , Robert Atmaram Soni
发明人： Noah Jacobsen , Robert Atmaram Soni
IPC分类号： H03M13/35
CPC分类号： H03M13/11 , H03M13/033 , H03M13/6306 , H03M13/635 , H03M13/6393
摘要： In a system for parity encoding data using a low density parity check (LDPC) code, a rate-compatible, irregular LDPC code is generated by extending a base code using a constrained edge growth operation and a parity splitting operation. The base code is a “daughter” code having an encoding rate higher than a designated rate of the LDPC code. The daughter code is progressively extended to lower and lower rates such that each extension code (including the target LDPC code) is compatible with the previously obtained codes. The extension operation may involve introducing a set of new code symbols to the daughter code, by splitting check nodes of a base graph associated with the daughter code, and through constrained edge growth of the base graph. The LDPC code is used to parity encode a data message as a means for forward error correction across a communication channel.
摘要翻译： 在使用低密度奇偶校验（LDPC）码的奇偶校验编码数据的系统中，通过使用约束边缘增长操作和奇偶校验分割操作扩展基本码来生成速率兼容的不规则LDPC码。 基本码是具有高于LDPC码的指定速率的编码速率的“女儿”码。 子代码逐渐扩展到较低和较低的速率，使得每个扩展码（包括目标LDPC码）与先前获得的代码兼容。 扩展操作可以包括通过分割与子代码相关联的基本图形的校验节点以及通过基本图形的约束边缘增长来向子代码引入一组新的代码符号。 LDPC码用于对数据消息进行奇偶校验编码，作为通过通信信道进行前向纠错的手段。
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7.发明授权Receiver architecture employing space time spreading and orthogonal transmit diversity techniques 有权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
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。
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8.发明授权公开(公告)号：US07400614B2
公开(公告)日：2008-07-15
申请号：US10282455
申请日：2002-10-29
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.
摘要翻译： 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可以或可以不等于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，每个发送天线通过用于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分量，该分量是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。 选择的沃尔什码集合包括沃尔什码（2）<2> （K）┐ Walsh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。 各个M相关的结果被组合，并且利用所获得的信道估计，接收机估计与该特定移动台有关的特定数据，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。
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公开(公告)号：US07035599B2
公开(公告)日：2006-04-25
申请号：US09918393
申请日：2001-07-30
IPC分类号： A04B1/02
CPC分类号： H04B7/0615 , H04B7/0667 , H04B7/0682
摘要： Disclosed is a method and apparatus of transmit diversity that is backward compatible and does not significantly degrade performance in additive white guassan noise (AWGN) conditions using a transmission architecture that incorporates a form of phase sweep transmit diversity (PSTD) referred to herein as biased PSTD. Biased PSTD involves transmitting a signal and a frequency swept version of the same signal over diversity antennas at different power levels. By transmitting the two signals at different power levels, the depths of nulls normally seen in AWGN conditions when PSTD is utilized is reduced and performance degradation in AWGN conditions is mitigated.
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公开(公告)号：US06801791B2
公开(公告)日：2004-10-05
申请号：US09810694
申请日：2001-03-14
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。
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