公开(公告)号：US20130083778A1

公开(公告)日：2013-04-04

申请号：US13249238

申请日：2011-09-30

Applicant: Xiao-an Wang

Inventor： Xiao-an Wang

IPC: H04W40/00 ,  H04W92/00 ,  H04L27/28 ,  H04B7/216

CPC classification number: H04L1/0027 ,  H04L1/0026 ,  H04L1/04 ,  H04L25/0228 ,  H04L2001/0093

Abstract: Multipoint broadcasting requires that the downlink-channel information be available at collaborating base stations. Methods and apparatus for wideband analog channel feedback are described that provide downlink-channel information feedback from mobile users to base stations via uplink channels, and that use very few or no resources of the RAT of the wireless cellular network. Also described are methods and apparatus that perform channel-feedback signal cancellation at base stations to reduce its interference on the uplink-traffic signal. Wideband analog channel feedback is adaptable to the feedback bandwidth in uplink, and it offers frequency diversity to combat the deep fading in feedback channels. Wideband analog channel feedback is also applicable to uplink channel-information feedback. Applications of the described methods and apparatus include multipoint broadcasting in a wireless cellular network, and more generally, channel feedback between two communicating devices in a communications network.

Abstract translation: 多点广播需要下行链路信道在协作基站可用。 描述了用于宽带模拟信道反馈的方法和装置，其通过上行链路信道从移动用户向基站提供下行链路信道信息反馈，并且使用无线蜂窝网络的RAT的很少或没有资源。 还描述了在基站执行信道反馈信号消除以减少其对上行链路业务信号的干扰的方法和装置。 宽带模拟信道反馈适用于上行链路的反馈带宽，并提供频率分集以抵御反馈信道的深度衰落。 宽带模拟信道反馈也适用于上行链路信道信息反馈。 所描述的方法和装置的应用包括无线蜂窝网络中的多点广播，更一般地，在通信网络中的两个通信设备之间的信道反馈。

公开(公告)号：US20120320765A1

公开(公告)日：2012-12-20

申请号：US13163725

申请日：2011-06-20

Applicant: Xiao-an Wang

Inventor： Xiao-an Wang

IPC: H04W24/00

CPC classification number: H04L25/0228 ,  H04L25/022 ,  H04L25/0222 ,  H04L25/0232 ,  H04W56/0035

Abstract: Methods and apparatus are described that provide efficient detection of the carrier-phase difference (CPD) between communicating devices over the entire signal bandwidth. The CPD detection utilizes the linear structure of the CPD, which eliminates most of the feedback overhead. Both feedback mechanisms, compact digitized feedback, and feedback via fast signaling protocols, are described. The CPD can be decomposed into a fixed/slow-changing portion and a fast-varying portion, with the former being pre-calibrated and communicated prior to communications sessions, thus further reducing the feedback overhead and improving the CPD detection accuracy. The nonlinearity in the TX/RX chains can also be pre-calibrated, allowing CPDs with more general structures to be detected by methods that detect CPDs with linear structures. Applications of the described methods and apparatus include wireless multipoint broadcast systems, also known as coordinated multipoint transmission, or CoMP, in LTE-A (long-term evolution, advanced) systems, and frequency and phase synchronization of a cluster of base stations.

Abstract translation: 描述了在整个信号带宽上提供通信设备之间的载波相位差（CPD）的有效检测的方法和装置。 CPD检测利用CPD的线性结构，消除了大部分的反馈开销。 描述了反馈机制，紧凑型数字化反馈和通过快速信令协议的反馈。 CPD可以分解为固定/慢变化部分和快速变化部分，前者在通信会话之前被预校准和通信，从而进一步减少反馈开销并提高CPD检测精度。 TX / RX链中的非线性也可以被预校准，允许通过用线性结构检测CPD的方法来检测具有更一般结构的CPD。 所描述的方法和装置的应用包括LTE-A（长期演进，高级）系统中的无线多点广播系统，也称为协调多点传输，或CoMP，以及基站簇的频率和相位同步。

公开(公告)号：US20120278690A1

公开(公告)日：2012-11-01

申请号：US13546180

申请日：2012-07-11

Applicant: Xiao-an Wang ,  Jens Berkmann

Inventor： Xiao-an Wang ,  Jens Berkmann

IPC: H03M13/09 ,  G06F11/10

CPC classification number: H03M13/091

Abstract: A description is given of an apparatus that includes a division unit configured to receive a data stream and to divide the received data stream into a plurality of data segments. The apparatus further includes a plurality of first CRC check units, wherein each of the first CRC check units is configured to perform a first CRC check of a respective one of the plurality of data segments, the plurality of first CRC checks being performed concurrently, and wherein each of the first CRC check units is configured to perform a second CRC check based on an output of the respective first CRC check unit.

Abstract translation: 给出了一种包括被配置为接收数据流并将接收的数据流划分成多个数据段的分割单元的装置的描述。 该装置还包括多个第一CRC校验单元，其中第一CRC校验单元中的每一个被配置为执行多个数据段中的相应一个数据段的第一CRC校验，多个第一CRC校验同时执行，以及 其中，所述第一CRC校验单元中的每一个被配置为基于相应的第一CRC校验单元的输出执行第二CRC校验。

公开(公告)号：US08175562B2

公开(公告)日：2012-05-08

申请号：US11553635

申请日：2006-10-27

Applicant: Roger A. Fratti ,  Xiao-an Wang

Inventor： Roger A. Fratti ,  Xiao-an Wang

IPC: H04B1/06

CPC classification number: H03G3/3068

Abstract: An apparatus including automatic gain control (AGC) includes at least one variable gain amplifier (VGA) operative to receive an input signal and to generate an amplified signal. A gain of the VGA is controlled as a function of at least a first control signal. The apparatus further includes an AGC circuit coupled to the VGA and being operative to generate the first control signal. The AGC circuit has a bandwidth that is controlled as a function of at least the amplified signal and a second control signal, the second control signal being indicative of a motion of the apparatus.

Abstract translation: 包括自动增益控制（AGC）的装置包括至少一个可操作以接收输入信号并产生放大信号的可变增益放大器（VGA）。 VGA的增益被控制为至少第一控制信号的函数。 该装置还包括耦合到VGA并可操作以产生第一控制信号的AGC电路。 所述AGC电路具有作为至少所述放大信号和第二控制信号的功能的带宽，所述第二控制信号表示所述装置的运动。

公开(公告)号：US07310394B2

公开(公告)日：2007-12-18

申请号：US10754340

申请日：2004-01-09

Applicant: Xiao-An Wang

Inventor： Xiao-An Wang

IPC: H04B1/10

CPC classification number: H04B1/712 ,  H04B2201/709727 ,  H04L1/20 ,  H04L25/03038 ,  H04L2025/03375 ,  H04L2025/03605 ,  H04L2025/03643

Abstract: Methods of recovering data in a received signal sent in a communications media are disclosed. Composite channel impulse responses are first estimated. Channel-tap locations are then assigned to suppress the interference noises by sequential search schemes or heuristic search schemes based on estimated composite channel impulse responses. A sequential search scheme optimizes a predetermined design criterion in a sequential manner. Also described are recursive evaluations of the design criterion and the inverses of the noise covariance matrices based on the composite channel impulse response during a sequential search. A heuristic search scheme selects channel-tap locations based on a set of pre-selected channel-tap locations. The set of pre-selected channel-tap locations is determined according to the estimated composite channel impulse response. A method of estimating energy levels of known interference sources is also described.

Abstract translation: 公开了在通信介质中发送的接收信号中恢复数据的方法。 首先估计复合信道脉冲响应。 然后分配频道抽头位置以通过基于估计的复合信道脉冲响应的顺序搜索方案或启发式搜索方案来抑制干扰噪声。 顺序搜索方案以顺序方式优化预定的设计标准。 还描述了基于在顺序搜索期间的复合信道脉冲响应的设计标准和噪声协方差矩阵的反演的递归评估。 启发式搜索方案基于一组预先选择的频道抽头位置来选择频道抽头位置。 根据估计的复合信道脉冲响应来确定预先选择的信道抽头位置集合。 还描述了估计已知干扰源的能量水平的方法。

公开(公告)号：US06549998B1

公开(公告)日：2003-04-15

申请号：US09483574

申请日：2000-01-14

Applicant: Steven P. Pekarich ,  Xiao-An Wang

Inventor： Steven P. Pekarich ,  Xiao-An Wang

IPC: G06F1202

CPC classification number: G06F9/345

Abstract: An interleaver generates a valid interleaved data address for each iteration i of the mapping by the interleaver without employing a multiplication operation. The interleaver includes an address generator comprises two counters, bit-reverse and index tables, and an accumulation register array. The interleaver further comprises two adders, two registers storing tentative address values addressi and addressi+1, and select logic including a comparator, two buffers, and a multiplexer (mux). Two counters are employed to allow the interleaver to generate at least one valid address for each iteration, and a tentative address is generated from each output value of the two counters. Each iteration generates an output interleaved address. A tentative address is generated by using a portion of the counter value as an address to select a corresponding entry from each of the bit-reverse and index tables and the accumulation register array. The selected values from the index table and accumulation register array are combined in an adder. The value selected from the bit-reverse table is appended to the combination of the selected values from the index table and accumulation register array to form the tentative address. The tentative address generated from the first counter value is compared with a threshold value, and, based on the comparison, one of the two tentative addresses is selected as the output interleaved address. Before beginning the next iteration, the accumulated value used in generating the valid output interleaved address is updated to a new accumulated value. If not all output interleaved addresses have been generated, the counters are incremented by the same increment value, the increment value dependent upon the comparison with the threshold value, and the next iteration begins.

Abstract translation: 交织器对于交织器的映射的每个迭代i生成有效的交织数据地址，而不采用乘法运算。 交织器包括地址发生器，包括两个计数器，位反向和索引表以及累加寄存器阵列。 交织器还包括两个加法器，存储暂定地址值addressi和addressi + 1的两个寄存器，以及包括比较器，两个缓冲器和多路复用器（多路复用器）的选择逻辑。 采用两个计数器来允许交织器为每次迭代生成至少一个有效地址，并且从两个计数器的每个输出值产生暂定地址。 每次迭代都会产生一个输出交错地址。 通过使用计数器值的一部分作为地址来生成暂定地址，以从每个比特反向索引表和累加寄存器阵列中选择相应条目。 来自索引表和累加寄存器阵列的选择值在加法器中组合。 从位反转表中选择的值被附加到来自索引表和累加寄存器阵列的所选值的组合以形成暂定地址。 将从第一计数器值生成的暂定地址与阈值进行比较，并且基于比较，选择两个暂时地址中的一个作为输出交织地址。 在开始下一次迭代之前，用于产生有效输出交错地址的累加值被更新为新的累积值。 如果不是全部输出交错地址已经被生成，则计数器递增相同的增量值，增量值取决于与阈值的比较，并且下一次迭代开始。

公开(公告)号：US06266331B1

公开(公告)日：2001-07-24

申请号：US09108429

申请日：1998-07-01

Applicant: Thomas W. Baker ,  Richard A. Cesari ,  Xiao-An Wang

Inventor： Thomas W. Baker ,  Richard A. Cesari ,  Xiao-An Wang

IPC: H04B7216

CPC classification number: H04J13/10 ,  H04B1/707

Abstract: The present invention discloses a device for generating multiple spreading sequences efficiently. In a preferred embodiment, the eight different spreading sequences are generated in parallel. In this embodiment, the spreading sequence generator comprises a master sequence generator and eight secondary sequence generators. The spreading sequence generator also comprises eight different modulo-2 adders which are used for generating parity check sum outputs. The master sequence generator is responsible for creating a master output from the first subgroup. The secondary sequence generators create eight different secondary outputs. Each of the secondary outputs is combined with the master output through one of the eight modulo-2 adders to create eight different spreading sequences. In an alternative embodiment, the principles of the present invention may be used to generate such spreading sequences in a sequential manner. Both embodiments provide efficiency and power savings over the prior art method and apparatus.

Abstract translation: 本发明公开了一种有效产生多个扩展序列的装置。在一个优选实施例中，八个不同的扩频序列是并行产生的。 在该实施例中，扩展序列发生器包括主序列发生器和八个二次序发生器。 扩展序列发生器还包括八个不同的模2加法器，用于产生奇偶校验和输出。主序列发生器负责从第一子组创建主输出。 二次序发生器产生八个不同的二次输出。 每个次级输出通过八个模2加法器之一与主输出组合，以产生八个不同的扩展序列。在替代实施例中，本发明的原理可以用于按顺序生成这样的扩展序列 。 两个实施例相对于现有技术的方法和装置提供效率和功率节省。

公开(公告)号：US10341143B2

公开(公告)日：2019-07-02

申请号：US15394805

申请日：2016-12-29

Applicant: Xiao-an Wang

Inventor： Xiao-an Wang

IPC: H04L25/02

Abstract: Methods and apparatus of channel estimation using time-domain parameter extraction are disclosed. The wireless channel can be modeled by a multipath model with a limited number of parameters in the continuous time domain. Extracting the time-domain parameters and then reconstructing the channel yields channel estimates that have better accuracy. Time-domain parameter extraction also has lower computational complexity than existing methods.

公开(公告)号：US09106259B2

公开(公告)日：2015-08-11

申请号：US13546180

申请日：2012-07-11

Applicant: Xiao-an Wang ,  Jens Berkmann

Inventor： Xiao-an Wang ,  Jens Berkmann

IPC: G06F11/10 ,  H03M13/00 ,  H03M13/09

CPC classification number: H03M13/091

Abstract: A description is given of an apparatus that includes a division unit configured to receive a data stream and to divide the received data stream into a plurality of data segments. The apparatus further includes a plurality of first CRC check units, wherein each of the first CRC check units is configured to perform a first CRC check of a respective one of the plurality of data segments, the plurality of first CRC checks being performed concurrently, and wherein each of the first CRC check units is configured to perform a second CRC check based on an output of the respective first CRC check unit.

Abstract translation: 给出了一种包括被配置为接收数据流并将接收的数据流划分成多个数据段的分割单元的装置的描述。 该装置还包括多个第一CRC校验单元，其中第一CRC校验单元中的每一个被配置为执行多个数据段中的相应一个数据段的第一CRC校验，多个第一CRC校验同时执行，以及 其中，所述第一CRC校验单元中的每一个被配置为基于相应的第一CRC校验单元的输出执行第二CRC校验。

公开(公告)号：US09031169B2

公开(公告)日：2015-05-12

申请号：US13769250

申请日：2013-02-15

Applicant: Xiao-an Wang

Inventor： Xiao-an Wang

IPC: H04L27/06 ,  H04L25/02

CPC classification number: H04L25/0204

Abstract: Most wireless channels are sparse, so sparse channel-based methods can be used for channel estimation and feedback with much better estimation accuracy and much lower feedback overhead. However, certain wireless channels can be non-sparse, for which sparse channel-based methods may cause degraded estimation quality and increased feedback overhead. Means of detecting the channel sparseness are described that provide simple and effective channel sparseness indicators and safeguard against the mismatch between non-sparse channels and sparse channel-based methods. Various fallback options can be used under non-sparse channels such that estimation degradation and feedback overhead are both minimized. Fake multipath removal in continuous time-domain parameter extraction, a sparse channel-based method, is also described that further improves estimation quality and reduces feedback overhead.

Abstract translation: 大多数无线信道是稀疏的，因此基于信道的稀疏方法可以用于信道估计和反馈，具有更好的估计精度和更低的反馈开销。 然而，某些无线信道可以是非稀疏的，对于这些信道，基于信道的稀疏方法可能导致估计质量下降和增加的反馈开销。 描述了检测通道稀疏度的手段，其提供简单有效的信道稀疏指示符，并且防止非稀疏信道与基于信道的稀疏信道之间的不匹配。 可以在非稀疏信道下使用各种备用选项，从而将估计降级和反馈开销都最小化。 还描述了连续时域参数提取中的虚拟多径去除，这是一种基于稀疏信道的方法，可进一步提高估计质量并降低反馈开销。