公开(公告)号：US08588319B2

公开(公告)日：2013-11-19

申请号：US12444499

申请日：2007-11-06

Applicant: Durga Prasad Malladi ,  Byoung-Hoon Kim ,  Taesang Yoo

Inventor： Durga Prasad Malladi ,  Byoung-Hoon Kim ,  Taesang Yoo

IPC: H04B7/02 ,  H04L1/02

CPC classification number: H04B7/065 ,  H04B7/0417 ,  H04B7/0617 ,  H04B7/0628 ,  H04B7/0641 ,  H04L1/0026 ,  H04L1/0625 ,  H04L1/0656 ,  H04L1/1812

Abstract: Techniques for supporting MIMO transmission with layer permutation are described. In one aspect, multiple codewords may be generated for transmission from multiple antennas (e.g., virtual antennas), with the number of codewords being less than the number of antennas. Each codeword may be mapped across the multiple antennas. Two codewords may be generated. For rank 3, the first codeword may be mapped to one layer (or one antenna on each subcarrier), and the second codeword may be mapped to two layers (or two antennas on each subcarrier). For rank 4, each codeword may be mapped to two layers. In another aspect, a base CQI indicative of an average signal quality may be determined. A delta CQI indicative of improvement over the average signal quality may also be determined. In yet another aspect, selection may be performed with different penalty factors for different ranks or number of codewords.

Abstract translation: 描述了支持具有层置换的MIMO传输的技术。 在一个方面，可以生成多个码字用于从多个天线（例如，虚拟天线）的发射，其中码字的数量小于天线的数量。 每个码字可以跨多个天线映射。 可以生成两个码字。 对于秩3，第一码字可以映射到一个层（或每个子载波上的一个天线），并且第二码字可以映射到两个层（或每个子载波上的两个天线）。 对于等级4，每个码字可以映射到两个层。 另一方面，可以确定表示平均信号质量的基本CQI。 也可以确定表示对平均信号质量的改善的增量CQI。 在另一方面，可以针对不同等级或码字数量对不同的惩罚因素进行选择。

公开(公告)号：US08503567B2

公开(公告)日：2013-08-06

申请号：US13190160

申请日：2011-07-25

Applicant: Byoung-Hoon Kim ,  Hao Xu

Inventor： Byoung-Hoon Kim ,  Hao Xu

IPC: H04B7/02

CPC classification number: H04L25/03343 ,  H04L1/06 ,  H04L2025/03426

Abstract: Techniques for performing rank-dependent precoding for a Mulitple-Input Multiple-Output (MIMO) transmission are described. Each rank may be associated with a set of at least one precoding vector or matrix that can provide good performance for that rank. A transmitter may obtain a precoding vector for a rank-1 transmission from a first set containing at least one column vector of a unitary matrix, e.g., a Fourier matrix. The transmitter may perform precoding for the rank-1 transmission based on the precoding vector. The transmitter may obtain a precoding matrix for a rank-2 transmission from a second set containing an identity matrix. The transmitter may perform precoding for the rank-2 transmission based on the precoding matrix. For the rank-2 transmission, the transmitter may select the identity matrix as the precoding matrix if a MIMO channel resembles a diagonal channel (which may be determined based on antenna configurations) and may select the unitary matrix otherwise.

Abstract translation: 描述了用于执行多输入多输出（MIMO）传输的等级相关预编码的技术。 每个等级可以与可以为该等级提供良好性能的至少一个预编码向量或矩阵的集合相关联。 发射机可以从包含单一矩阵的至少一个列向量（例如傅立叶矩阵）的第一集合获得用于秩1传输的预编码向量。 发射机可以基于预编码向量来执行秩1传输的预编码。 发射机可以从包含单位矩阵的第二集合获得用于等级-2传输的预编码矩阵。 发射机可以基于预编码矩阵来执行秩2传输的预编码。 对于秩2传输，如果MIMO信道类似于对角信道（可以基于天线配置确定），则发射机可以选择单位矩阵作为预编码矩阵，否则可以选择酉矩阵。

公开(公告)号：US20130155896A1

公开(公告)日：2013-06-20

申请号：US13817870

申请日：2011-03-02

Applicant: Jaewon Lim ,  Song Chong ,  Jeonghoon Mo ,  Jihwan Kim ,  Byoung-Hoon Kim ,  Jeongho Kwak

Inventor： Jaewon Lim ,  Song Chong ,  Jeonghoon Mo ,  Jihwan Kim ,  Byoung-Hoon Kim ,  Jeongho Kwak

IPC: H04W52/02

CPC classification number: H04W52/0206 ,  H04W48/04 ,  H04W48/16 ,  Y02D70/1224 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/146 ,  Y02D70/164

Abstract: Specifically, according to one embodiment of the present invention, a method for searching for an access point is provided. The method for searching may comprises the steps of: a terminal measuring the position thereof; checking an access point located near the measured position of the terminal; determining whether or not the distance between the terminal and the access point is greater than the radius range searchable by the terminal; and searching for the access point when the distance between the terminal and the access point is less than the radius range.

Abstract translation: 具体地，根据本发明的一个实施例，提供了一种用于搜索接入点的方法。 所述搜索方法可以包括以下步骤：终端测量其位置; 检查靠近终端测量位置的接入点; 确定终端和接入点之间的距离是否大于终端可搜索的半径范围; 并且当终端和接入点之间的距离小于半径范围时，搜索接入点。

公开(公告)号：US20120128043A1

公开(公告)日：2012-05-24

申请号：US13322885

申请日：2009-11-03

Applicant: Dae-Sik Hong ,  Go-San Noh ,  Han-Ho Wang ,  Jun-Ho Jo ,  Yong-Ho Seok ,  Byoung-Hoon Kim

Inventor： Dae-Sik Hong ,  Go-San Noh ,  Han-Ho Wang ,  Jun-Ho Jo ,  Yong-Ho Seok ,  Byoung-Hoon Kim

IPC: H04B15/00 ,  H04B1/38

CPC classification number: H04W16/14 ,  H04W74/0808

Abstract: Disclosed are an apparatus and method for determining a frame structure for reducing interference between users using the same frequency band in a communication system using a cognitive radio, the method including, collecting channel status information related to a primary user with a priority to occupancy of a predetermined frequency band, executing spectrum sensing for the frequency band to check whether the primary user's traffic exists, deciding a length of a data frame to be transmitted in consideration of interference to the primary user based upon the collected channel status information if a channel in which the primary user's traffic is not present is sensed through the spectrum sensing, constructing a data frame based upon the decided frame length to transmit via the sensed channel, and re-executing the spectrum sensing for the channel, if data to be additionally transmitted exists, and rechecking whether the primary user's traffic is present.

Abstract translation: 公开了一种用于在使用认知无线电的通信系统中确定用于减少使用相同频带的用户之间的干扰的帧结构的装置和方法，所述方法包括：收集与主用户相关的信道状态信息，优先占用 对频段执行频谱检测，以检查主用户的业务是否存在，基于所收集的信道状态信息，基于所收集的信道状态信息来确定考虑到主用户的干扰的要发送的数据帧的长度，如果其中的信道 通过频谱感测来感测主要用户的业务不存在，根据所确定的帧长度构建数据帧，以经由所感测到的信道进行发送，并且如果要附加发送的数据存在，则重新执行该信道的频谱感测， 并重新检查主要用户的流量是否存在。

公开(公告)号：US20110280294A1

公开(公告)日：2011-11-17

申请号：US12778861

申请日：2010-05-12

Applicant: Tao Luo ,  Yongbin Wei ,  Byoung-Hoon Kim

Inventor： Tao Luo ,  Yongbin Wei ,  Byoung-Hoon Kim

IPC: H04B17/00

CPC classification number: H04L25/0228 ,  H04L25/0204 ,  H04L25/0212 ,  H04L25/022

Abstract: Methods and systems are disclosed for channel estimation and frequency tracking in mobile communication systems. Particularly, various ways of using the time domain impulse channel response based on the staggered frequency domain pilot tones are presented that enable rapid frequency error estimation and frequency tracking control. A mathematical model is developed that provides a convenient metric for evaluating tolerable frequency error, as well as modes for switching between CIR-based and SSC-based frequency tracking.

Abstract translation: 公开了用于移动通信系统中的信道估计和频率跟踪的方法和系统。 特别地，提出了使用基于交错频域导频音的时域脉冲信道响应的各种方式，其能够进行快速频率误差估计和频率跟踪控制。 开发了一种数学模型，为评估可容忍的频率误差提供了便利的度量，以及在基于CIR和基于SSC的频率跟踪之间切换的模式。

公开(公告)号：US08059609B2

公开(公告)日：2011-11-15

申请号：US11686950

申请日：2007-03-15

Applicant: Byoung-Hoon Kim ,  Durga Prasad Malladi

Inventor： Byoung-Hoon Kim ,  Durga Prasad Malladi

IPC: H04W4/00

CPC classification number: H04B7/0452 ,  H04B7/0417 ,  H04B7/0632 ,  H04B7/0634 ,  H04L1/06 ,  H04L1/1812 ,  H04L1/1854 ,  H04L1/1887 ,  H04L27/2608

Abstract: Techniques for supporting MIMO transmission are described. Users are classified into a first group of users to be scheduled individually for MIMO transmission and a second group of users that can be scheduled together for MIMO transmission. Transmission resources are allocated to the first and second groups, e.g., based upon various criteria such as the number of users in each group, data requirements of the users, total loading for each group, etc. The transmission resources may be hybrid automatic retransmission (HARQ) interlaces, frequency channels, time frequency resources, etc. The resource allocation may be semi-static. The transmission resources allocated to each group are used for data transmission on the downlink and/or uplink for the users in the group. HARQ with blanking may be used for data transmission for the users in the first group. HARQ without blanking may be used for data transmission for the users in the second group.

Abstract translation: 描述了支持MIMO传输的技术。 用户被分类为要单独调度用于MIMO传输的第一组用户和可以一起调度用于MIMO传输的第二组用户。 传输资源分配给第一组和第二组，例如基于各组用户数，各用户的数据需求，每个组的总负载等各种标准。传输资源可以是混合自动重传（ HARQ）交织，频率信道，时间频率资源等。资源分配可以是半静态的。 分配给每个组的传输资源用于组中用户的下行链路和/或上行链路上的数据传输。 具有消隐的HARQ可以用于第一组中的用户的数据传输。 不消消息的HARQ可以用于第二组中的用户的数据传输。

公开(公告)号：US08014455B2

公开(公告)日：2011-09-06

申请号：US11686952

申请日：2007-03-15

Applicant: Byoung-Hoon Kim ,  Durga Prasad Malladi ,  Jelena Damnjanovic

Inventor： Byoung-Hoon Kim ,  Durga Prasad Malladi ,  Jelena Damnjanovic

IPC: H04K1/10

CPC classification number: H04L1/0026 ,  H04B7/0632 ,  H04B7/0641 ,  H04B7/066 ,  H04L1/0029 ,  H04L1/06 ,  H04L27/2608

Abstract: Techniques for efficiently sending channel state information using differential encoding are described. Differential encoding may be performed across space, across frequency; across space and frequency, across space, frequency and time, or across some other combination of dimensions. In one design, spatial state information may be determined for multiple spatial channels on multiple subbands. The spatial channels may correspond to different antennas, different precoding vectors, etc. Channel quality indicator (CQI) values may be obtained for the multiple spatial channels on the multiple subbands. The CQI values may be differentially encoded across the multiple spatial channels and the multiple subbands to obtain differential CQI information. In another design, CQI values may be obtained for multiple spatial channels on the multiple subbands in multiple time intervals and may be differentially encoded across space, frequency and time. The differential CQI information and the spatial state information may be sent as feedback.

Abstract translation: 描述使用差分编码有效地发送信道状态信息的技术。 差分编码可以跨越空间跨越频率执行; 跨越空间和频率，跨越空间，频率和时间，或跨越其他尺寸的组合。 在一种设计中，可以为多个子带上的多个空间信道确定空间状态信息。 空间信道可以对应于不同的天线，不同的预编码向量等。可以为多个子带上的多个空间信道获得信道质量指示符（CQI）值。 CQI值可以在多个空间信道和多个子带之间进行差分编码，以获得差分CQI信息。 在另一种设计中，可以在多个时间间隔中对多个子带上的多个空间信道获得CQI值，并且可以在空间，频率和时间之间进行差分编码。 差分CQI信息和空间状态信息可以作为反馈发送。

公开(公告)号：US08014265B2

公开(公告)日：2011-09-06

申请号：US12189483

申请日：2008-08-11

Applicant: Sandip Sarkar ,  Byoung-Hoon Kim ,  Durga Prasad Malladi ,  Juan Montojo

Inventor： Sandip Sarkar ,  Byoung-Hoon Kim ,  Durga Prasad Malladi ,  Juan Montojo

IPC: H04W4/00

CPC classification number: H04B7/0417 ,  H04B7/0434 ,  H04B7/063 ,  H04B7/0632 ,  H04L5/14 ,  H04L25/0204 ,  H04L25/0228 ,  H04L25/0242 ,  H04L25/03343 ,  H04L2025/03426 ,  H04L2025/03802

Abstract: Techniques for sending multiple-input multiple-output (MIMO) transmissions in wireless communication systems are described. In one design, a transmitter sends a first reference signal via a first link, e.g., a cell-specific reference signal via the downlink. The transmitter receives channel quality indicator (CQI) information determined by a receiver based on the first reference signal. The transmitter also receives a second reference signal from the receiver via a second link, e.g., a sounding reference signal via the uplink. The transmitter obtains at least one MIMO channel matrix for the first link based on the second reference signal. The transmitter determines at least one precoding matrix based on the at least one MIMO channel matrix, e.g., in accordance with ideal eigen-beamforming or pseudo eigen-beamforming. The transmitter then sends a data transmission to the receiver based on the at least one precoding matrix and the CQI information.

Abstract translation: 描述了在无线通信系统中发送多输入多输出（MIMO）传输的技术。 在一种设计中，发射机经由第一链路发送第一参考信号，例如经由下行链路的小区特定参考信号。 发射机基于第一参考信号接收由接收机确定的信道质量指示符（CQI）信息。 发射机还经由第二链路从接收机接收第二参考信号，例如经由上行链路的探测参考信号。 发射机基于第二参考信号获得用于第一链路的至少一个MIMO信道矩阵。 发射机基于至少一个MIMO信道矩阵来确定至少一个预编码矩阵，例如，根据理想的本征波束形成或伪特征波束形成。 然后，发射机基于至少一个预编码矩阵和CQI信息向接收机发送数据传输。

公开(公告)号：US08009617B2

公开(公告)日：2011-08-30

申请号：US12189548

申请日：2008-08-11

Applicant: Sandip Sarkar ,  Byoung-Hoon Kim ,  Durga Prasad Malladi ,  Juan Montojo

Inventor： Sandip Sarkar ,  Byoung-Hoon Kim ,  Durga Prasad Malladi ,  Juan Montojo

IPC: H04W4/00

CPC classification number: H04B7/043 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L5/0023 ,  H04L5/0053 ,  H04L25/03343 ,  H04L2025/03426 ,  H04L2025/03802

Abstract: Techniques for sending traffic data and control information in a wireless communication system are described. In one design, a transmitter (e.g., a Node B or a UE) may perform beamforming to send traffic data on M layers based on a precoding matrix, where M may be one or greater. The transmitter may also perform beamforming to send control information on up to M layers based on the same precoding matrix used for the traffic data. The transmitter may send the beamformed traffic data on a first physical channel and may send the beamformed control information on a second physical channel. The transmitter may multiplex the beamformed traffic data and the beamformed control information using time division multiplexing (TDM) or frequency division multiplexing (FDM).

Abstract translation: 描述用于在无线通信系统中发送业务数据和控制信息的技术。 在一种设计中，发射机（例如，节点B或UE）可以基于预编码矩阵来执行波束成形以在M层上发送业务数据，其中M可以是一个或更多个。 发射机还可以基于用于业务数据的相同预编码矩阵来执行波束成形以发送多达M个层的控制信息。 发射机可以在第一物理信道上发送波束形成的业务数据，并且可以在第二物理信道上发送波束形成的控制信息。 发射机可以使用时分复用（TDM）或频分复用（FDM）来复用波束形成的业务数据和波束形成的控制信息。

公开(公告)号：US07995671B2

公开(公告)日：2011-08-09

申请号：US12027921

申请日：2008-02-07

Applicant: Byoung-Hoon Kim ,  Hao Xu

Inventor： Byoung-Hoon Kim ,  Hao Xu

IPC: H04B7/02

CPC classification number: H04L25/03343 ,  H04L1/06 ,  H04L2025/03426

Abstract: Techniques for performing rank-dependent precoding for a multiple-input multiple-output (MIMO) transmission are described. Each rank may be associated with a set of at least one precoding vector or matrix that can provide good performance for that rank. A transmitter may obtain a precoding vector for a rank-1 transmission from a first set containing at least one column vector of a unitary matrix, e.g., a Fourier matrix. The transmitter may perform precoding for the rank-1 transmission based on the precoding vector. The transmitter may obtain a precoding matrix for a rank-2 transmission from a second set containing an identity matrix. The transmitter may perform precoding for the rank-2 transmission based on the precoding matrix. For the rank-2 transmission, the transmitter may select the identity matrix as the precoding matrix if a MIMO channel resembles a diagonal channel (which may be determined based on antenna configurations) and may select the unitary matrix otherwise.

Abstract translation: 描述了用于执行多输入多输出（MIMO）传输的等级相关预编码的技术。 每个等级可以与可以为该等级提供良好性能的至少一个预编码向量或矩阵的集合相关联。 发射机可以从包含单一矩阵的至少一个列向量（例如傅立叶矩阵）的第一集合获得用于秩1传输的预编码向量。 发射机可以基于预编码向量来执行秩1传输的预编码。 发射机可以从包含单位矩阵的第二集合获得用于等级-2传输的预编码矩阵。 发射机可以基于预编码矩阵来执行秩2传输的预编码。 对于秩2传输，如果MIMO信道类似于对角信道（其可以基于天线配置确定），则发射机可以选择单位矩阵作为预编码矩阵，否则可以选择酉矩阵。