公开(公告)号：US06724843B1

公开(公告)日：2004-04-20

申请号：US09504174

申请日：2000-02-15

申请人： Kenneth L. Clarkson ,  Wim Sweldens ,  Alice Xiaozhou Zheng

发明人： Kenneth L. Clarkson ,  Wim Sweldens ,  Alice Xiaozhou Zheng

IPC分类号： H04B710

CPC分类号： H04L1/0618

摘要： Received symbols are decoded in a multiple-antenna communication system using lattice-based decoding. The symbols are generated using a modulation constellation, e.g., a diagonal modulation constellation, and the constellation is characterized as a lattice for decoding purposes. For example, if a given communication link of the multiple-antenna communication system includes M transmitter antennas and a single receiver antenna, the diagonal modulation constellation can be characterized as a lattice in M dimensions. A differential decoding operation for received differential symbols involves a determination of the closest point in the lattice corresponding to the constellation. This determination may be made in an efficient manner using a basis reduction algorithm which generates an approximately orthogonal basis for the lattice, and then utilizes component-wise rounding to determine the closest point. The lattice-based decoding has a complexity which is polynomial rather than exponential in the particular number of antennas and the system rate, but is nonetheless able to deliver error rate performance which approximates that of maximum likelihood decoding.

摘要翻译： 接收的符号在使用基于格的解码的多天线通信系统中解码。 使用调制星座（例如，对角线调制星座）生成符号，并且星座被表征为用于解码目的的格子。 例如，如果多天线通信系统的给定通信链路包括M个发射机天线和单个接收机天线，则对角线调制星座可以被表征为M维的格子。 用于接收到的差分符号的差分解码操作涉及确定与星座相对应的格中最近的点。 可以以有效的方式使用生成格子的近似正交基的基本简化算法来进行该确定，然后利用分量舍入来确定最近的点。 基于格子的解码具有多项式而不是特定数量的天线的指数和系统速率的复杂度，但仍然能够提供近似最大似然解码的误码率性能。

公开(公告)号：US06560299B1

公开(公告)日：2003-05-06

申请号：US09363813

申请日：1999-07-30

申请人： Christopher H Strolle ,  Anand M Shah ,  Thomas J Endres ,  Samir N Hulyalkar ,  Troy A Schaffer

发明人： Christopher H Strolle ,  Anand M Shah ,  Thomas J Endres ,  Samir N Hulyalkar ,  Troy A Schaffer

IPC分类号： H04B710

CPC分类号： H04L27/066 ,  H04B7/0848 ,  H04L7/0029 ,  H04L7/005 ,  H04L2027/003 ,  H04L2027/0057

摘要： A diversity receiver is coupled to a composite antenna having first and second antennas physically configured to provide one or more forms of diversity reception. The multiple channel diversity receiver includes first and second RF channels with joint signal processing. First and second RF signals are processed jointly in the multiple channel diversity receiver with respect to tuning, automatic gain control (AGC), baud clock recovery, RF carrier recovery and forward equalization. The multiple channels of the diversity receiver are linked or cross coupled to each other through respective joint processing circuitry. In particular, first and second RF tuners share a common local oscillator and a common AGC feedback loop. First and second front ends share a common baud timing loop and a common pilot carrier recovery loop. Finally, first and second diversity receiver channels share a common sparse equalization filter. By processing first and second signals jointly in the diversity receiver, the receiver provides equal or superior performance to a single receiver processing only the best signal.

摘要翻译： 分集接收机耦合到复合天线，其具有物理地配置为提供一种或多种形式的分集接收的第一和第二天线。 多信道分集接收机包括具有联合信号处理的第一和第二RF信道。 关于调谐，自动增益控制（AGC），波特率时钟恢复，RF载波恢复和正向均衡，第一和第二RF信号在多信道分集接收机中联合处理。 分集接收机的多个信道通过相应的联合处理电路彼此链接或交叉耦合。 特别地，第一和第二RF调谐器共享公共本地振荡器和公共AGC反馈回路。 第一和第二前端共享一个通用的波特率定时回路和一个公共导频载波恢复回路。 最后，第一和第二分集接收机信道共享一个共同的稀疏均衡滤波器。 通过在分集接收机中联合处理第一和第二信号，接收机对仅处理最佳信号的单个接收机提供相等或优越的性能。

公开(公告)号：US06415005B2

公开(公告)日：2002-07-02

申请号：US09266633

申请日：1999-03-11

申请人： Shoichi Koga ,  Yuji Igata ,  Satoshi Hasako ,  Masahiro Maki ,  Michinori Kishimoto

发明人： Shoichi Koga ,  Yuji Igata ,  Satoshi Hasako ,  Masahiro Maki ,  Michinori Kishimoto

IPC分类号： H04B710

CPC分类号： H04L1/0068 ,  H04B1/713 ,  H04B2001/71563 ,  H04L1/0041 ,  H04L1/0054 ,  H04L1/0071 ,  H04L1/20 ,  H04L5/0046 ,  H04L5/006 ,  H04L27/0012 ,  H04L27/103 ,  H04L27/2608

摘要： A highly reliable and high-speed data transmission is made by using an FH or MFSK mode as suitably selected according to the usage of channels. When a reception signal is entered into a receiver through a transmission line, (i) a signal processing unit supplies the spectrum intensity values of carrier frequencies, (ii) a channel detection unit controls the phase of a time slot based on the spectrum intensity values, selects the MFSK or FH modulation mode, and supplies reception code data corresponding to detected carrier frequencies, and (iii) a decoder supplies reception information data based on the reception code data. When transmission information data are entered into a transmitter, (i) a coding unit supplies, according to the selected modulation mode, transmission code data based on the transmission information data, (ii) a channel generation unit supplies, based on the transmission code data, carrier frequencies to be used and (iii) a waveform generation unit supplies a transmission signal to a transmission line.

摘要翻译： 通过使用FH或MFSK模式根据通道的用途进行适当选择，进行高度可靠和高速的数据传输。 当通过传输线将接收信号输入接收机时，（i）信号处理单元提供载频的频谱强度值，（ii）信道检测单元根据频谱强度值控制时隙的相位 选择MFSK或FH调制模式，并提供对应于检测到的载波频率的接收码数据，以及（iii）解码器基于接收码数据提供接收信息数据。 当发送信息数据被输入发送机时，（i）编码单元根据所选择的调制模式，根据发送信息数据提供发送代码数据，（ii）信道生成单元基于发送代码数据 ，要使用的载波频率和（iii）波形发生单元将传输信号提供给传输线。

公开(公告)号：US06804312B1

公开(公告)日：2004-10-12

申请号：US09722897

申请日：2000-11-27

申请人： Moe Z. Win ,  Jack Harriman Winters

发明人： Moe Z. Win ,  Jack Harriman Winters

IPC分类号： H04B710

CPC分类号： H04B7/0874 ,  H04B7/0632 ,  H04B7/0691

摘要： The present invention provides techniques to determine an antenna selection and associated weights for a transmission system having multiple antennas. A receiver first samples signals received on each antenna and the channel characteristics for each received signal is calculated. The signal-to-interference-plus-noise (SINR) ratio for various combinations of antennas is estimated using the channel characteristics and a subset of antennas and accompanying weights are determined that can provide an advantageous SINR.

摘要翻译： 本发明提供了确定具有多个天线的传输系统的天线选择和相关权重的技术。 接收机首先对在每个天线上接收的信号进行采样，并计算每个接收信号的信道特性。 使用信道特性来估计各种天线组合的信号干扰加噪声（SINR）比，并且确定可以提供有利的SINR的天线子集和伴随权重。

公开(公告)号：US06442222B1

公开(公告)日：2002-08-27

申请号：US09321457

申请日：1999-05-27

申请人： Vafa Ghazi-Moghadam ,  Titus Lo

发明人： Vafa Ghazi-Moghadam ,  Titus Lo

IPC分类号： H04B710

CPC分类号： H04B7/0851 ,  H04L25/023 ,  H04L27/2647

摘要： A method provides for an improved compensation Fourier channel characteristics in a wireless communication embodiment. The method identifies one or more information carriers as pseudo pilot tones whose information may be realized to enhance the determination of the complex coefficient of the communication channel.

摘要翻译： 一种方法在无线通信实施例中提供了改进的补偿傅里叶频道特性。 该方法将一个或多个信息载体标识为可以实现其信息的伪导频音，以增强通信信道的复系数的确定。

公开(公告)号：US06385434B1

公开(公告)日：2002-05-07

申请号：US09153976

申请日：1998-09-16

申请人： Jeffery Scott Chuprun ,  Chad S. Bergstrom ,  Byron Tarver ,  Bennett C. Beaudry

发明人： Jeffery Scott Chuprun ,  Chad S. Bergstrom ,  Byron Tarver ,  Bennett C. Beaudry

IPC分类号： H04B710

CPC分类号： H04W16/10 ,  H04W16/14 ,  H04W84/14

摘要： A wireless access unit (12) for providing an interface between a satellite communications system (32) and a plurality of terrestrial user devices (14-26) in a centralized or distributed architecture includes a spectrum allocation unit (92) for dynamically allocating spectrum to the plurality of terrestrial user devices (14-26) based on a spectral environment about the wireless access unit (12). A spectrum scan unit (60) scans the spectral environment about the wireless access unit (12) and generates a spectrum signal indicative thereof. An environment understanding unit (61) provides signal information corresponding to signal emitters in proximity to the distributed or centralized network. A spectrum table (90) assembles data related to the spectral environment and the proximity emitters for use by the spectrum allocation unit (92) in dynamically allocating spectrum.

摘要翻译： 用于在集中或分布式架构中提供卫星通信系统（32）和多个地面用户设备（14-26）之间的接口的无线接入单元（12）包括：频谱分配单元（92），用于动态分配频谱 所述多个地面用户设备（14-26）基于关于所述无线接入单元（12）的频谱环境。 频谱扫描单元（60）扫描关于无线接入单元（12）的频谱环境，并产生指示它的频谱信号。 环境理解单元（61）提供对应于分布式或集中式网络附近的信号发射器的信号信息。 频谱表（90）组合与频谱环境有关的数据和邻近发射器，供频谱分配单元（92）动态分配频谱。

公开(公告)号：US06320919B1

公开(公告)日：2001-11-20

申请号：US09201623

申请日：1998-11-30

申请人： Ali S. Khayrallah ,  Tracy Fulghum

发明人： Ali S. Khayrallah ,  Tracy Fulghum

IPC分类号： H04B710

CPC分类号： H04L1/06 ,  H04B7/0845 ,  H04L25/0236

摘要： Methods and systems are provided for channel tracking utilizing multi-pass demodulation in which, during the second pass, decoded symbols are treated as known symbols which are used to calculate the error term used in updating the propagation characterization during the second pass. This allows a higher bandwidth to be used for updating the propagation characterization while known symbols are being processed. In particular, the propagation characterization may be provided by a channel tracker or a multi-antenna receiver, such as an interference rejection/combining (IRC) system, with an impairment correlation matrix estimator or a combination of both. Accordingly, the spatial diversity characteristics of the received signal (from IRC) and the temporal (or timing) characteristics (from the channel tracker) may both be tracked at different bandwidths for decoded and undecoded symbols to allow improved performance under fast changing channel conditions while maintaining desired performance characteristics while processing undecoded symbols.

摘要翻译： 提供了用于使用多遍解调的信道跟踪的方法和系统，其中在第二遍期间，解码符号被视为已知符号，其用于计算在第二遍期间更新传播表征时使用的误差项。 这允许在正在处理已知符号时使用更高的带宽来更新传播表征。 特别地，传播特性可以由信道跟踪器或诸如干扰抑制/组合（IRC）系统的多天线接收机与损害相关矩阵估计器或两者的组合来提供。 因此，接收信号（来自IRC）和时间（或定时）特性（来自信道跟踪器）的空间分集特性可以在解码和未解码符号的不同带宽下被跟踪，以允许在快速变化的信道条件下提高性能， 在处理未解码的符号时保持期望的性能特征。

公开(公告)号：US06240148B1

公开(公告)日：2001-05-29

申请号：US08908919

申请日：1997-08-08

申请人： Guoliang Shou ,  Changming Zhou ,  Xuping Zhou ,  Mamoru Sawahashi ,  Fumiyuki Adachi

发明人： Guoliang Shou ,  Changming Zhou ,  Xuping Zhou ,  Mamoru Sawahashi ,  Fumiyuki Adachi

IPC分类号： H04B710

CPC分类号： H04B7/08 ,  H04B1/7115 ,  H04B2201/70701

摘要： The present invention provides a path-diversity system featuring a small-size phase compensating circuit. This circuit calculates a compensating coefficient according to the signals of a pilot block or a pair of pilot blocks surrounding an information block, and then compensates information signals thereafter by the calculated compensating coefficient.

摘要翻译： 本发明提供一种具有小尺寸相位补偿电路的路径分集系统。 该电路根据导频块或围绕信息块的一对导频块的信号来计算补偿系数，然后通过计算的补偿系数补偿信息信号。

公开(公告)号：US06721367B1

公开(公告)日：2004-04-13

申请号：US09434109

申请日：1999-11-05

申请人： Kazuyuki Miya ,  Katsuhiko Hiramatsu ,  Hideyuki Takahashi

发明人： Kazuyuki Miya ,  Katsuhiko Hiramatsu ,  Hideyuki Takahashi

IPC分类号： H04B710

CPC分类号： H04W52/42 ,  H04B7/0615

摘要： When switching to a path whose directivity changes greatly or a path with a widely different propagation delay, transmission is performed for both directivities for a certain period of time. Then, transmission is performed for one directivity. When the switching of transmission directivities is controlled, this allows correct reception of signals and prevents instantaneous interruption due to loss of synchronism even if transmission is performed by switching to a path with a widely different propagation delay.

摘要翻译： 当切换到方向性变化很大的路径或具有广泛不同的传播延迟的路径时，对于两个方向性在一段时间内执行传输。 然后，对于一个方向性执行传输。 当控制传输方向性的切换时，即使通过切换到具有广泛不同的传播延迟的路径来执行传输，也允许信号的正确接收并且防止由于失去同步而导致的瞬时中断。

公开(公告)号：US06618454B1

公开(公告)日：2003-09-09

申请号：US09213585

申请日：1998-12-17

申请人： Dakshi Agrawal ,  Ayman F. Naguib ,  Nambirajan Seshadri ,  Vahid Tarokh

发明人： Dakshi Agrawal ,  Ayman F. Naguib ,  Nambirajan Seshadri ,  Vahid Tarokh

IPC分类号： H04B710

CPC分类号： H04B7/0613 ,  H04B7/04 ,  H04B7/0848 ,  H04L1/0618 ,  H04L27/2601

摘要： Orthogonal Frequency Division Multiplexing (OFDM) is combined with a plurality of transmitting antennas to yield a system that provides space, frequency and time diversity. Specifically, an arrangement is created where a transmitter includes a plurality of antennas that are transmitting simultaneously over the same frequency subbands, and the symbols that are transmitted over each subband, in any given time slot, over the different antennas are encoded to provide diversity. The principles of trellis coding, space-time coding, or any other diversity-producing coding can be applied in this arrangement.

摘要翻译： 正交频分复用（OFDM）与多个发射天线组合以产生提供空间，频率和时间分集的系统。 具体地，创建一种布置，其中发射机包括在相同频率子带上同时发射的多个天线，并且在任何给定时隙中通过不同天线在每个子带上发送的符号被编码以提供分集。 网格编码，时空编码或任何其他产生分集的编码的原理可以应用于这种布置。