公开(公告)号：WO2008103805A3

公开(公告)日：2008-10-16

申请号：PCT/US2008054543

申请日：2008-02-21

Applicant: CISCO TECH INC ,  WANG GENYUAN ,  JIN HANG ,  LOU HANQING ,  HEDAYAT AHMADREZA

Inventor： WANG GENYUAN ,  JIN HANG ,  LOU HANQING ,  HEDAYAT AHMADREZA

IPC: H04B7/06 ,  H04B7/04

CPC classification number: H04B7/0691 ,  H04B7/0617 ,  H04B7/0671 ,  H04L5/0023 ,  H04W52/42

Abstract: A method and system are provided for achieving spatial diversity of a wireless communications network. The method comprises arranging antennas on a transmitting wireless station into a plurality of antenna subgroups, wherein each of the antenna subgroups forms a virtual antenna, creating a plurality of beamformed MIMO channels using the plurality of virtual antennas, wherein each of the beamformed MIMO channel comprises a plurality of sub-carriers and corresponds to a virtual antenna, dividing sub-carriers in each of the plurality of beamformed MIMO channels into at least a first and second cluster, distributing a first amount of transmitting power to the first cluster and a second amount of transmitting power to the second cluster, wherein the first amount of transmitting power is larger than the second amount of transmitting power.

Abstract translation: 提供了一种用于实现无线通信网络的空间分集的方法和系统。 该方法包括将发射无线站上的天线布置到多个天线子组中，其中每个天线子组形成虚拟天线，使用多个虚拟天线创建多个波束形成的MIMO信道，其中每个波束形成的MIMO信道包括 多个子载波，并且对应于虚拟天线，将所述多个波束形成的MIMO信道中的每一个中的子载波划分为至少第一和第二簇，将第一发射功率量分配给所述第一簇，并将第二量 向所述第二群发射功率，其中所述第一发射功率量大于所述第二发射功率量。

公开(公告)号：WO2014028369A3

公开(公告)日：2014-04-10

申请号：PCT/US2013054491

申请日：2013-08-12

Applicant: CISCO TECH INC

Inventor： CHAN DOUGLAS ,  AHMED MANSOOR ,  HEDAYAT AHMADREZA ,  HART BRIAN D

IPC: H04W16/10 ,  H04W16/14 ,  H04W74/08

CPC classification number: H04W76/025 ,  H04W16/14 ,  H04W72/0426 ,  H04W74/0816 ,  H04W84/12

Abstract: Techniques are provided for selecting channels for use by access points operating in a wireless local area network. Metrics are computed for at least one set of radio frequency (RF) channels, wherein the set of RF channels comprises at least two RF channels in a frequency band that are available for use by a wireless network for a wider bandwidth mode that combines bandwidth of two or more RF channels. Alignment of individual primary and secondary RF channels is determined in the set of RF channels for operation of at least first and second wireless networks. A bias is applied to the metrics for each RF channel that is a member of the set of RF channels for the primary channel depending on alignment of the primary and secondary channels of the respective first and second wireless networks to produce adjusted metrics, based on which RF channels are assigned.

Abstract translation: 提供技术用于选择在无线局域网中操作的接入点使用的信道。 针对至少一组射频（RF）信道计算度量，其中所述一组RF信道包括频带中的至少两个可用于无线网络用于更宽带宽模式的RF信道，所述更宽带宽模式将带宽 两个或更多个RF信道。 在用于至少第一和第二无线网络的操作的RF信道集中确定各个主和次RF信道的对准。 根据相应的第一和第二无线网络的主要和次要信道的对齐性，将偏差应用于作为用于主信道的RF信道集合的成员的每个RF信道的度量，以产生经调整的度量，基于该度量 RF通道被分配。

公开(公告)号：WO2009020903A3

公开(公告)日：2009-04-16

申请号：PCT/US2008072077

申请日：2008-08-04

Applicant: CISCO TECH INC ,  HEDAYAT AHMADREZA ,  WANG GENYUAN ,  JIN HANG ,  LOU HANQING

Inventor： HEDAYAT AHMADREZA ,  WANG GENYUAN ,  JIN HANG ,  LOU HANQING

IPC: H04B7/06 ,  H04B7/04 ,  H04B7/08

CPC classification number: H04B7/0617 ,  H04B7/0404 ,  H04B7/0413 ,  H04B7/0434 ,  H04B7/0851

Abstract: Techniques are provided to enable wireless communication between first and second wireless communication devices each having a plurality of antennas, where the second device sends the transmissions via less than all of its plurality of antennas. Each transmission may comprise a plurality of time-frequency instances. At the first communication device, data is derived representing parameters of a communication channel between the plurality of antennas of the first device and all of the plurality of antennas of the second device from the transmissions received at the plurality of antennas of the first device. Beamforming weights for transmitting one or more signal streams via the plurality of antennas of the first device to the plurality of antennas of the second device are computed based on the data representing parameters of the communication channel between the plurality of antennas of the first device and the plurality of antennas of the second device. The beamforming weights are applied to the one or more signal streams to be transmitted via the plurality of antennas of the first device to the plurality of antennas of the second device.

Abstract translation: 提供了技术来实现每个具有多个天线的第一和第二无线通信设备之间的无线通信，其中第二设备经由小于其全部多个天线发送传输。 每个传输可以包括多个时频实例。 在第一通信设备处，从第一设备的多个天线处接收到的传输中导出表示第一设备的多个天线与第二设备的所有多个天线之间的通信信道的参数的数据。 基于表示第一设备的多个天线之间的通信信道的参数的数据和表示第一设备的多个天线之间的通信信道的参数的数据来计算用于经由第一设备的多个天线将一个或多个信号流发送到第二设备的多个天线的波束成形权重 第二装置的多个天线。 波束成形权重被施加到要经由第一设备的多个天线发送到第二设备的多个天线的一个或多个信号流。

公开(公告)号：WO2009045769A3

公开(公告)日：2009-07-23

申请号：PCT/US2008077169

申请日：2008-09-22

Applicant: CISCO TECH INC ,  JIN HANG ,  LOU HANQING ,  HEDAYAT AHMADREZA

Inventor： JIN HANG ,  LOU HANQING ,  HEDAYAT AHMADREZA

IPC: H04L1/00 ,  H04L1/20

CPC classification number: H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/0618 ,  H04L1/20

Abstract: Techniques are provided to compute the carrier to interference-plus-noise ratio (CINR) in a wireless communication system using log-likelihood ratio (LLR) data generated from a received transmission. The LLR data are collected as they are sent from a detector to a forward error correction (FEC) decoder in a wireless communications device. In one embodiment, decision-aided LLR based CINR is computed using the decoded bits output from the FEC decoder as feedback. In another embodiment, blind LLR based CINR is computed without feedback. The CINR may be used to adjust a modulation and/or coding parameters associated with wireless communication between wireless communication devices.

Abstract translation: 提供技术来使用从接收的传输产生的对数似然比（LLR）数据来计算无线通信系统中的载波与干扰加噪声比（CINR）。 在从无线通信设备中的检测器向前向纠错（FEC）解码器发送时收集LLR数据。 在一个实施例中，使用从FEC解码器输出的解码比特作为反馈来计算基于决策辅助的基于LLR的CINR。 在另一个实施例中，在没有反馈的情况下计算基于盲LLR的CINR。 CINR可以用于调整与无线通信设备之间的无线通信相关联的调制和/或编码参数。

公开(公告)号：EP2636187A4

公开(公告)日：2018-05-02

申请号：EP11838381

申请日：2011-05-20

Applicant: CISCO TECH INC

Inventor： HART BRIAN ,  HEDAYAT AHMADREZA

IPC: H04L5/00 ,  H04L1/00 ,  H04W28/20

CPC classification number: H04L5/1438 ,  H04L1/0054 ,  H04L1/0061 ,  H04L5/001 ,  H04L5/0064 ,  H04L5/0092 ,  H04W28/20

Abstract: Disclosed in an example embodiment is an apparatus comprising a transmitter and processing logic coupled with the transmitter. The processing logic is configured to send data via the transmitter. The processing logic generates a request to send frame. The processing logic encodes data representative of a bandwidth parameter set in the request to send frame. The processing logic transmits the request to send frame via the transmitter.

公开(公告)号：EP2057740A4

公开(公告)日：2010-05-05

申请号：EP07759511

申请日：2007-03-27

Applicant: CISCO TECH INC

Inventor： HEDAYAT AHMADREZA ,  JIN HANG

IPC: H03M13/03 ,  H03M13/41

CPC classification number: H04L1/0054 ,  H03M13/3994 ,  H03M13/4107 ,  H03M13/413 ,  H04L1/0059

Abstract: A method and system are provided for improving the performance of a trellis-based decoder. States with reduced uncertainty (SRUs) are defined for one or more predetermined fields in an encoded message. Metrics are set for the SRUs such that candidate paths through a trellis-based decoding process are eliminated for those states that are not SRUs.

公开(公告)号：EP1958358A4

公开(公告)日：2013-04-03

申请号：EP06836942

申请日：2006-11-04

Applicant: CISCO TECH INC

Inventor： JIN HANG ,  HEDAYAT AHMADREZA ,  GRABNER JOHN

IPC: H04M1/00 ,  H04B7/04 ,  H04B7/06

CPC classification number: H04B7/0619 ,  H04B7/0413 ,  H04B7/0617 ,  H04B7/0691

Abstract: The present invention discloses a method and system for signal communication in a multi-input multi-output network. The method creates beamformed channels by calculating one or more beamforming weighting vectors corresponding to one or more antennas on the receiving wireless station based on the predetermined receiving signals. The transmitting wireless station transmits one or more beamformed transmission signals to the receiving wireless station using the calculated beamforming weighting vectors for targeting at the antennas thereon, thereby creating two or more detectably uncorrelated transmission signals received at the receiving wireless station.