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公开(公告)号：US07035238B1
公开(公告)日：2006-04-25
申请号：US09353460
申请日：1999-07-13
IPC分类号： H04B7/216
CPC分类号： H04J13/18 , H04B1/7097 , H04J13/004
摘要： A CDMA wireless communication system for communicating with wireless terminals. The system comprises a channel estimator for determining characteristics of the wireless channels of the wireless terminals. The channel characteristics are used by a code optimizer to assign spreading codes to the wireless terminals. In one embodiment, the code optimizer utilizes an iterative code optimization algorithm and maintains a processing set of wireless terminals. The code optimizer chooses target wireless terminals and performs a random code search in order to find an improved code for the target wireless terminal. The improved code found in the random code search is further improved by performing a gradient search of codes in the signal space in the vicinity of the improved code and by performing a gradient search of transmission delays. The improved codes are transmitted to the wireless terminals for use in reverse link communication.
摘要翻译： 一种用于与无线终端进行通信的CDMA无线通信系统。 该系统包括用于确定无线终端的无线信道的特性的信道估计器。 信道特性被代码优化器用于向无线终端分配扩展码。 在一个实施例中，代码优化器利用迭代代码优化算法并维护无线终端的处理集合。 代码优化器选择目标无线终端，并执行随机码搜索，以找到目标无线终端的改进代码。 通过对改进码附近的信号空间中的码进行梯度搜索，并通过执行传输延迟的梯度搜索来进一步改进在随机码搜索中发现的改进码。 改进的代码被发送到无线终端以用于反向链路通信。
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2.发明授权Wireless communications system having a space-time architecture employing multi-element antennas at both the transmitter and receiver 有权无线通信系统具有在发射机和接收机两端采用多单元天线的时空架构公开(公告)号：US06763073B2
公开(公告)日：2004-07-13
申请号：US09882120
申请日：2001-06-15
IPC分类号： H04L2728
CPC分类号： H04B7/204 , H01Q3/2611 , H04L1/0618
摘要： The bit rate at which a digital wireless communications system communicates data in scattering environments may be significantly increased by using multiple antennas at both the transmitter and receiver and by decomposing the channel into m subchannels. In the same frequency band, m one dimensional signals are transmitted into a scattering environment which makes these transmitted signals appear spatially independent at the receiver antenna array. The high bit rate is enabled by special receiver processing to maximize the minimum signal-to-noise ratio of the receiver detection process.
摘要翻译： 数字无线通信系统在散射环境中传送数据的比特率可以通过在发射机和接收机两者处使用多个天线以及将信道分解成m个子信道来显着增加。 在相同的频带中，一维信号被传输到散射环境中，这使得这些发射信号在接收机天线阵列处看起来在空间上独立。 通过专门的接收机处理来实现高比特率以最大化接收机检测过程的最小信噪比。
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3.发明授权Wireless communications system having a layered space-time architecture employing multi-element antennas 失效具有采用多元天线的分层时空架构的无线通信系统
公开(公告)号：US06097771A
公开(公告)日：2000-08-01
申请号：US673981
申请日：1996-07-01
IPC分类号： H04B15/00 , H04B7/06 , H04B7/08 , H04J99/00 , H04L1/06 , H03D1/04 , H03D1/06 , H03K5/01 , H03K6/04
CPC分类号： H04L1/0656 , H04B7/0669 , H04L1/0631 , H04B7/0848
摘要： The Shannon limit governs the ultimate bit rate at which a digital wireless communications system may communicate data. A digital wireless receiver may be enhanced such that it approaches the Shannon limit by decomposing a n-dimensional system into n-one dimensional systems of equal capacity.
摘要翻译： 香农限制管理数字无线通信系统可能传达数据的最终比特率。 数字无线接收机可以被增强，使得其通过将n维系统分解为等容量的n维系统来接近香农极限。
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4.发明授权公开(公告)号：US06888809B1
公开(公告)日：2005-05-03
申请号：US09482429
申请日：2000-01-13
CPC分类号： H04B7/0634 , H04B7/0626
摘要： In a MIMO system the signals transmitted from the various antennas are processed so as to improve the ability of the receiver to extract them from the received signal even in the face of some correlation. More specifically the number of bit streams that is transmitted simultaneously is adjusted, e.g., reduced, depending on the level of correlation, while multiple versions of each bit stream, variously weighted, are transmitted simultaneously. The variously weighted versions are combined to produced one combined weighted signal. The receiver processes the received signals in the same manner as it would have had all the signals reaching the receive antennas been uncorrelated. The weight vectors may be determined by the forward channel transmitter using the channel properties of the forward link which are made known to the transmitter of the forward link by being transmitted from the receiver of the forward link by the transmitter of the reverse link or the weight vectors may be determined by the forward channel transmitter using the channel properties of the forward link and the determined weight vectors are made known to the transmitter of the forward link by being transmitted from the receiver of the forward link by the transmitter of the reverse link. The channel properties used to determine the weight vectors may include the channel response from the transmitter to the receiver and the covariance matrix of noise and interference measured at the receiver.
摘要翻译： 在MIMO系统中，处理从各种天线发送的信号，以便即使面对一些相关性，也可以提高接收机从接收信号中提取它们的能力。 更具体地，根据相关级别来调整，例如减少同时传输的比特流的数量，同时传输各种加密的每个比特流的多个版本。 将各种加权版本组合以产生一个组合加权信号。 接收机以与所有到达接收天线的所有信号不相关的相同方式处理接收到的信号。 加权向量可以由正向信道发射机使用正向链路的信道属性来确定，前向链路的信道属性是由前向链路的发射机通过反向链路的发射机从前向链路的接收机发送的， 向量可以由正向信道发射机使用前向链路的信道特性来确定，所确定的权重向量通过从反向链路的发射机从前向链路的接收机发送到前向链路的发射机。 用于确定权重向量的信道属性可以包括从发射机到接收机的信道响应以及在接收机处测量的噪声和干扰的协方差矩阵。
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5.发明授权Wireless communications system having a space-time architecture employing multi-element antennas at both the transmitter and receiver 失效无线通信系统具有在发射机和接收机两端采用多单元天线的时空架构公开(公告)号：US06317466B1
公开(公告)日：2001-11-13
申请号：US09060657
申请日：1998-04-15
IPC分类号： H04B110
CPC分类号： H04B7/204 , H01Q3/2611 , H04L1/0618
摘要： The bit rate at which a digital wireless communications system communicates data in scattering environments may be significantly increased by using multiple antennas at both the transmitter and receiver and by decomposing the channel into m subchannels. In the same frequency band, m one dimensional signals are transmitted into a scattering environment which makes these transmitted signals appear spatially independent at the receive antenna array. The high bit rate is enabled by special receiver processing to maximize the minimum signal-to-noise ratio of the receiver detection process.
摘要翻译： 数字无线通信系统在散射环境中传送数据的比特率可以通过在发射机和接收机两者处使用多个天线以及将信道分解成m个子信道来显着增加。 在相同的频带中，一维信号被传输到散射环境中，这使得这些发射信号在接收天线阵列处看起来在空间上独立。 通过专门的接收机处理来实现高比特率以最大化接收机检测过程的最小信噪比。
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公开(公告)号：US5748681A
公开(公告)日：1998-05-05
申请号：US549363
申请日：1995-10-27
申请人： Vittorio Comino , Gerard Joseph Foschini , Isam M. Habbab , Sanjay Kasturia , Jack Salz , Michael Edward Prise , Ravi Subramanian
发明人： Vittorio Comino , Gerard Joseph Foschini , Isam M. Habbab , Sanjay Kasturia , Jack Salz , Michael Edward Prise , Ravi Subramanian
CPC分类号： H04L25/061 , H04L7/046 , H04L7/027 , H04L7/041 , H04L7/10
摘要： DC offset cancellation and timing recovery is provided in a homodyne receiver. The homodyne receiver demodulates an RF signal to produce a baseband signal. An initial offset correction module determines an initial DC offset of the baseband signal. An initial offset correction is applied to the baseband signal to provide an initial corrected baseband signal. Wherein, a dynamic DC offset correction module determines a dynamic DC offset. A dynamic DC offset correction is applied to the initial corrected baseband signal providing a dynamic corrected baseband signal. A timing signal is acquired from the baseband signal for synchronizing the receiver to a transmitter. A method for correcting DC offset of a baseband signal in a homodyne receiver is also described.
摘要翻译： 在零差接收机中提供DC偏移消除和定时恢复。 零差接收机解调RF信号以产生基带信号。 初始偏移校正模块确定基带信号的初始DC偏移。 对基带信号施加初始偏移校正以提供初始校正的基带信号。 其中，动态DC偏移校正模块确定动态DC偏移。 将动态DC偏移校正应用于提供动态校正基带信号的初始校正基带信号。 从用于使接收机同步到发射机的基带信号获取定时信号。 还描述了用于校正零差接收机中的基带信号的DC偏移的方法。
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