公开(公告)号：US20180262368A1

公开(公告)日：2018-09-13

申请号：US15394805

申请日：2016-12-29

Applicant: Xiao-an Wang

Inventor： Xiao-an Wang

IPC: H04L25/02

CPC classification number: H04L25/0212 ,  H04L25/022 ,  H04L25/0224 ,  H04L25/025 ,  H04L25/0256

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：US09571305B2

公开(公告)日：2017-02-14

申请号：US13648254

申请日：2012-10-09

Applicant: Xiao-an Wang

Inventor： Xiao-an Wang

IPC: H04L12/28 ,  H04L25/02

CPC classification number: H04L25/0212 ,  H04L25/022 ,  H04L25/0224 ,  H04L25/025 ,  H04L25/0256

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. In the discrete time domain, the multipath model leads to channel impulse responses that have a limited number of channel taps with non-negligible energy. 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.

Abstract translation: 公开了使用时域参数提取的信道估计的方法和装置。 无线信道可以由连续时域中具有有限数量的参数的多径模型建模。 在离散时域中，多径模型导致信道脉冲响应具有有限数量的具有不可忽略能量的信道抽头。 提取时域参数，然后重建信道，产生具有更好精度的信道估计。 时域参数提取还具有比现有方法更低的计算复杂度。

公开(公告)号：US20140293803A1

公开(公告)日：2014-10-02

申请号：US13854130

申请日：2013-03-31

Applicant: Xiao-an Wang

Inventor： Xiao-an Wang

IPC: H04W24/02 ,  H04B7/04 ,  H04W16/28

CPC classification number: H04W24/02 ,  H04B7/024 ,  H04B7/0452 ,  H04W16/28

Abstract: MU-MIMO and CoMP have potentials to increase the cell capacity by many folds. Interferences and channel feedback overhead, however, severely limits such potentials. Method of reference signal-based grid of beams (RS-GOB) is described. RS-GOB distributes the effective antennas of a base station into multiple beams, thereby significantly reducing the feedback overhead of CoMP and making effective use of CoMP to turn the interferences into cooperating useful signals. RS-GOB also reduces the need for small HetNet cells, which mitigates the interferences of small HetNet cells on macro cells.

Abstract translation: MU-MIMO和CoMP具有将细胞容量增加许多倍的潜力。 然而，干扰和渠道反馈开销严重限制了这种潜力。 描述了基于信号的光束网格（RS-GOB）的方法。 RS-GOB将基站的有效天线分配到多个波束中，从而大大减少了CoMP的反馈开销，并有效利用了CoMP将干扰转化为合作的有用信号。 RS-GOB还减少了对小型HetNet电池的需求，从而减轻了小型HetNet电池在宏电池上的干扰。

公开(公告)号：US08792372B2

公开(公告)日：2014-07-29

申请号：US13163725

申请日：2011-06-20

Applicant: Xiao-an Wang

Inventor： Xiao-an Wang

IPC: G01R31/08

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：US20140098704A1

公开(公告)日：2014-04-10

申请号：US13648254

申请日：2012-10-09

Applicant: Xiao-an Wang

Inventor： Xiao-an Wang

IPC: H04W16/00

CPC classification number: H04L25/0212 ,  H04L25/022 ,  H04L25/0224 ,  H04L25/025 ,  H04L25/0256

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. In the discrete time domain, the multipath model leads to channel impulse responses that have a limited number of channel taps with non-negligible energy. 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.

Abstract translation: 公开了使用时域参数提取的信道估计的方法和装置。 无线信道可以由连续时域中具有有限数量的参数的多径模型建模。 在离散时域中，多径模型导致信道脉冲响应具有有限数量的具有不可忽略能量的信道抽头。 提取时域参数，然后重建信道，产生具有更好精度的信道估计。 时域参数提取还具有比现有方法更低的计算复杂度。

公开(公告)号：US08644265B2

公开(公告)日：2014-02-04

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：US20130029586A1

公开(公告)日：2013-01-31

申请号：US13194992

申请日：2011-07-31

Applicant: Xiao-an Wang

Inventor： Xiao-an Wang

IPC: H04H20/71

CPC classification number: H04L25/02 ,  H04B7/0452 ,  H04B7/0626 ,  H04L1/0693 ,  H04L25/0204 ,  H04L27/2655 ,  H04L27/2657 ,  H04L27/2695 ,  H04W56/00

Abstract: Multipoint broadcasting requires the base stations to be phase-synchronized. Methods and apparatus are described that provide phase synchronization of base stations with the downlink-channel phase feedback by mobile users. Also described are methods and apparatus that make phase synchronization of base stations independent of multipoint-broadcast sessions, thus reducing the synchronization overhead and improving network capacity. The methods and apparatus utilize model-based downlink-channel phase feedback that reduces most of the feedback overhead. 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, or more generally, of a cluster of wireless devices.

Abstract translation: 多点广播需要基站进行相位同步。 描述了提供移动用户的基站与下行链路信道相位反馈的相位同步的方法和装置。 还描述了使得独立于多点广播会话的基站的相位同步的方法和装置，从而减少了同步开销并提高了网络容量。 该方法和装置利用基于模型的下行链路信道相位反馈，其减少大部分的反馈开销。 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，以及基站集群的频率和相位同步，或 更一般地，是一组无线设备。

公开(公告)号：US20100125777A1

公开(公告)日：2010-05-20

申请号：US12271553

申请日：2008-11-14

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 and a plurality of first CRC check units, wherein each of the first CRC units is configured to perform a CRC check of a respective one of the plurality of segments of data, and wherein the plurality of CRC checks are performed concurrently.

Abstract translation: 给出了一种包括分配单元的设备的描述，该分割单元被配置为接收数据流并将接收的数据流划分为多个数据段和多个第一CRC校验单元，其中每个第一CRC单元被配置为 执行所述多个数据段中的相应一个的CRC校验，并且其中所述多个CRC校验同时执行。

公开(公告)号：US06567466B1

公开(公告)日：2003-05-20

申请号：US09250744

申请日：1999-02-16

Applicant: Sameer V. Ovalekar ,  Xiao-An Wang

Inventor： Sameer V. Ovalekar ,  Xiao-An Wang

IPC: H04B1700

CPC classification number: H04L25/0262 ,  H04B1/707 ,  H04B2201/70705

Abstract: A method and apparatus are disclosed for determining the data rate of a received signal in a communication system utilizing code division multiple access (CDMA) techniques. The well-known Viterbi decoding-based rate detection approach is combined with the conventional repetition pattern-based rate detection approach. The hybrid approach possesses the advantages of both prior approaches, without their disadvantages. The computationally efficient repetition pattern-based data rate detection approach, while not as reliable as the Viterbi decoder-based data rate detection approach, provides reliable data rate detection most of the time. The repetition-pattern data rate detection approach is used as long as a predefined reliability metric is satisfied, and only uses the more computationally intensive Viterbi decoder-based data rate detection approach when detection reliability may be compromised. Under the hybrid rate detection scheme, a decision variable based on repetition patterns is initially formed and a decision is made on the data rate if the decision variable is in a reliable region. Otherwise, the Viterbi decoding-based rate detection scheme is employed.

Abstract translation: 公开了一种用于在利用码分多址（CDMA）技术的通信系统中确定接收信号的数据速率的方法和装置。 众所周知的基于维特比解码的速率检测方法与传统的基于重复模式的速率检测方法相结合。 混合方法具有两种现有方法的优点，没有其缺点。 基于计算效率的基于重复模式的数据速率检测方法虽然不如基于维特比解码器的数据速率检测方法那样可靠，但大多数时间提供了可靠的数据速率检测。 只要满足预定的可靠性度量，就使用重复模式数据速率检测方法，并且当检测可靠性可能受到损害时，仅使用基于维特比解码器的数据速率检测方法。 在混合速率检测方案下，最初形成基于重复模式的决策变量，并且如果判决变量在可靠区域中，则决定数据速率。 否则，采用基于维特比解码的速率检测方案。

公开(公告)号：US06526531B1

公开(公告)日：2003-02-25

申请号：US09532637

申请日：2000-03-22

Applicant: Xiao-An Wang

Inventor： Xiao-An Wang

IPC: G06F1100

CPC classification number: H03M13/2975 ,  H03M13/09 ,  H03M13/2957

Abstract: An iterative decoder decodes a frame of encoded data that includes error detection information, and terminates the iterative decoding based on a comparison of the decoded frame with the error detection information. The iterative decoder may have a maximum number of specified iterations, but may terminate the number of iterations early under specified conditions. The encoded data includes error detection information for parity check calculation. Error detection information may be in accordance with an error detection code, such as a cyclic redundancy check (CRC) code. After each iteration of decoding, a parity check is calculated for the decoded frame. Early termination of decoding may occur prior to an intermediate iteration threshold M of iterations when the parity check value of the decoded frame is equivalent to the parity check value calculated from the error detection information. Early termination of decoding after M iterations may also occur when a difference in decoding error between frames is either i) below a minimum error distance threshold or ii) no longer monotonically decreasing.

Abstract translation: 迭代解码器解码包括错误检测信息的编码数据帧，并且基于解码帧与错误检测信息的比较来终止迭代解码。 迭代解码器可以具有指定迭代的最大数量，但是可以在特定条件下提前终止迭代次数。 编码数据包括用于奇偶校验计算的错误检测信息。 错误检测信息可以与诸如循环冗余校验（CRC）码之类的错误检测码一致。 在解码的每次迭代之后，针对解码的帧计算奇偶校验。 当解码帧的奇偶校验值等于从错误检测信息计算出的奇偶校验值时，可以在迭代的中间迭代阈值M之前发生解码的提前终止。 当帧之间的解码错误的差异为i）低于最小误差距离阈值或者ii）不再单调递减时，也可能发生M次迭代之后的解码的提前终止。