公开(公告)号：EP2380288A2

公开(公告)日：2011-10-26

申请号：EP09838001.7

申请日：2009-12-18

申请人： NEC Laboratories America, Inc.

发明人： PRASAD, Narayan ,  KHOJASTEPOUR, Mohammad Ali ,  JIANG, Meilong ,  WANG, Xiaodong ,  RANGARAJAN, Sampath

IPC分类号： H04B7/208 ,  H04W72/12 ,  H04B7/04

CPC分类号： H04W72/04 ,  H04B7/0452 ,  H04B7/0639 ,  H04B7/066 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0025 ,  H04L1/0026 ,  H04L1/20 ,  H04L5/0007 ,  H04L25/0208 ,  H04W8/26 ,  H04W28/04 ,  H04W52/346 ,  H04W72/0446 ,  H04W72/12 ,  H04W72/1231 ,  H04W72/1289

摘要： Methods and systems for conveying or transmitting to any given user in an OFDMA-MU-MIMO system scheduling information of other co-scheduled users to permit the user to perform error-correction on received data and/or interference reduction on its received signals. The scheduling information can include resource block assignment, modulation constellations employed, coding rates employed, power levels utilized and precoder matrix indices used. Further, the scheduling information can be conveyed in part through dedicated reference symbol layers or pilot streams. Moreover, a base station may transmit a preliminary estimate of the total number of users the base station expects to schedule, or an upper-bound on the total number of users, to the MU-MIMO users to permit the MU-MIMO users to determine preferred precoder matrix indices and indications of channel quality indices.

公开(公告)号：EP2380287A2

公开(公告)日：2011-10-26

申请号：EP09838000.9

申请日：2009-12-18

申请人： NEC Laboratories America, Inc.

发明人： PRASAD, Narayan ,  KHOJASTEPOUR, Mohammad Ali ,  JIANG, Meilong ,  WANG, Xiaodong ,  RANGARAJAN, Sampath

IPC分类号： H04B7/208 ,  H04W72/12 ,  H04B7/04

CPC分类号： H04W72/04 ,  H04B7/0452 ,  H04B7/0639 ,  H04B7/066 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0025 ,  H04L1/0026 ,  H04L1/20 ,  H04L5/0007 ,  H04L25/0208 ,  H04W8/26 ,  H04W28/04 ,  H04W52/346 ,  H04W72/0446 ,  H04W72/12 ,  H04W72/1231 ,  H04W72/1289

摘要： Methods and systems for conveying or transmitting to any given user in an OFDMA-MU-MIMO system scheduling information of other co-scheduled users to permit the user to perform error-correction on received data and/or interference reduction on its received signals. The scheduling information can include resource block assignment, modulation constellations employed, coding rates employed, power levels utilized and precoder matrix indices used. Further, the scheduling information can be conveyed in part through dedicated reference symbol layers or pilot streams. Moreover, a base station may transmit a preliminary estimate of the total number of users the base station expects to schedule, or an upper-bound on the total number of users, to the MU-MIMO users to permit the MU-MIMO users to determine preferred precoder matrix indices and indications of channel quality indices.

公开(公告)号：EP2378674A1

公开(公告)日：2011-10-19

申请号：EP11173646.8

申请日：2008-08-15

申请人： Qualcomm Incorporated

发明人： Kim, Byoung-hoon ,  Malladi, Durga Prasad ,  Montojo, Juan ,  Sarkar, Sandip

IPC分类号： H04B7/06 ,  H04L1/06 ,  H04L25/02

CPC分类号： H04L25/0208 ,  H04B7/061 ,  H04L1/0026 ,  H04L1/0693 ,  H04L25/0224

摘要： Systems and methodologies are described that facilitate employing downlink precoding based on uplink sounding channel measurement and channel reciprocity in time division duplex or time division multiplex systems. In particular, mechanism are provided that enable downlink precoding in situations where user equipment antenna configuration includes an unequal number of transmit chains and receive chains. A mobile device transmits modulated sounding reference signals on each antenna during a calibration stage. The mobile device then transmits non-modulated sounding reference signals during a normal mode. A base station utilizes the modulated and non-modulated sounding reference signals to restore a downlink channel estimate employed in downlink precoding.

摘要翻译： 描述了有助于在时分双工或时分复用系统中基于上行链路探测信道测量和信道互易性采用下行链路预编码的系统和方法。 特别地，提供了在用户设备天线配置包括不等数量的发射链和接收链的情况下实现下行链路预编码的机制。 移动设备在校准阶段期间在每个天线上发送调制的探测参考信号。 然后，移动设备在正常模式期间发送未调制的探测参考信号。 基站利用调制和未调制的探测参考信号来恢复在下行链路预编码中采用的下行链路信道估计。

公开(公告)号：EP1793518A4

公开(公告)日：2011-07-20

申请号：EP05791531

申请日：2005-09-22

申请人： DA TANG MOBILE COMM EQUIPMENT

发明人： WANG YINGMIN ,  ZHONG NAN ,  REN SHIYAN ,  LIU NING

IPC分类号： H04J13/00 ,  H04B1/10

CPC分类号： H04B1/7103 ,  H04B1/7105 ,  H04B1/7107 ,  H04B2201/70702 ,  H04L25/0208

公开(公告)号：EP2228934A1

公开(公告)日：2010-09-15

申请号：EP08870529.8

申请日：2008-12-26

申请人： Panasonic Corporation

发明人： TAKATA, Tomofumi ,  IMAMURA, Daichi ,  NAKAO, Seigo ,  FUTAGI, Sadaki ,  IWAI, Takashi ,  OGAWA, Yoshihiko

IPC分类号： H04J11/00 ,  H04B1/707 ,  H04W72/04

CPC分类号： H04L5/0048 ,  H04B7/0632 ,  H04J11/00 ,  H04J13/0003 ,  H04J13/0055 ,  H04J13/0059 ,  H04J13/0074 ,  H04J13/10 ,  H04L5/0007 ,  H04L5/0057 ,  H04L25/0204 ,  H04L25/0208 ,  H04L25/0228 ,  H04L27/2695 ,  H04W72/0413 ,  H04W72/0446 ,  H04W72/082 ,  H04W88/02

摘要： It is possible to provide a radio communication terminal device and a radio transmission method which can improve reception performance of a CQI and a reference signal. A phase table storage unit (112) stores a phase table which correlates the amount of cyclic shift to complex coefficients {w1, W2} to be multiplied on the reference signal. A complex coefficient multiplication unit (113) reads out a complex coefficient corresponding to the amount of cyclic shift indicated by resource allocation information, from the phase table storage unit (112) and multiplies the read-out complex coefficient on the reference signal so as to change the phase relationship between the reference signals in a slot.

公开(公告)号：EP2195939A2

公开(公告)日：2010-06-16

申请号：EP08797970.4

申请日：2008-08-15

申请人： QUALCOMM Incorporated

发明人： KIM, Byoung-hoon ,  MALLADI, Durga, Prasad ,  MONTOJO, Juan ,  SARKAR, Sandip

IPC分类号： H04B7/06 ,  H04L1/06 ,  H04L25/02

CPC分类号： H04L25/0208 ,  H04B7/061 ,  H04L1/0026 ,  H04L1/0693 ,  H04L25/0224

摘要： Systems and methodologies are described that facilitate employing downlink precoding based on uplink sounding channel measurement and channel reciprocity in time division duplex or time division multiplex systems. In particular, mechanism are provided that enable downlink precoding in situations where user equipment antenna configuration includes an unequal number of transmit chains and receive chains. A mobile device transmits modulated sounding reference signals on each antenna during a calibration stage. The mobile device then transmits non-modulated sounding reference signals during a normal mode. A base station utilizes the modulated and non-modulated sounding reference signals to restore a downlink channel estimate employed in downlink precoding.

公开(公告)号：EP1964299A2

公开(公告)日：2008-09-03

申请号：EP06832150.4

申请日：2006-12-07

申请人： NXP B.V.

发明人： PAKER, Ozgun ,  OOSTVEEN, Job, C.

IPC分类号： H04L1/06 ,  H04B7/08 ,  H04L27/38 ,  H03M13/37

CPC分类号： H04L27/38 ,  H04B7/0413 ,  H04L25/0208 ,  H04L25/0244 ,  H04L27/2601

摘要： In a MIMO receiver, initial solutions using sub-optional decoding algorithm are determined for the symbols transmitted from each of a number of transmit antennas at a given time (100). The initial solutions (Sinit1,..., SinitNt) are hard-mapped to the nearest possible symbols of transmission (Sest1,..., SestNt). For each of the nearest possible symbols limited areas around them in the constellation plane are defined. A list of candidate symbol vectors (list) is then determined, including only symbols lying within the limited areas of the constellation plane. Finally, a joint decoding technique such as ML-technique is implemented to determine the best of the candidate symbol vectors. The number of the calculations can thus be significantly reduced, without having excessively damaging effects on the symbol error rate.

公开(公告)号：EP1878136A2

公开(公告)日：2008-01-16

申请号：EP06732890.6

申请日：2006-05-02

申请人： LG Electronics Inc.

发明人： KIM, Hak Seong ,  KIM, Bong Hoe ,  ROH, Dong Wook ,  AHN, Joon Kui ,  SEO, Dong Youn

IPC分类号： H04B7/08 ,  H04L27/26

CPC分类号： H04L5/023 ,  H04L25/0208 ,  H04L27/261 ,  H04L27/2647 ,  H04W4/18 ,  H04W8/26 ,  H04W24/00 ,  H04W88/08

摘要： A method for receiving signals in a multi-carrier multiple access system is disclosed. The method comprises receiving signals from at least one base station wherein each signal has a base station identifier, processing the signals to identify each base station by using the base station identifier, performing a channel estimation using the processed signals, combining the processed signals using an information obtained form the channel estimation and decoding the combined signals. Also, an apparatus for receiving signals in a multi-carrier multiple access system comprises a serial-to-parallel converter (41 ) for converting a serial signal including a base station identifier from al least one base station to parallel signals, a Fast Fourier transformer (42) for transforming the parallel signals, a parallel-to-serial converter (43) for converting the parallel signals to a serial signal, a dispreading processor (44) for dispreading frequency domain signals using the base station identifier form at least one base station, a channel estimator (45) for compensating a channel variation between the at least one base station and a mobile station, a signal combiner (46) for combining signals from base stations and a decoder (47) for decoding the combined signal.

公开(公告)号：EP1825611A1

公开(公告)日：2007-08-29

申请号：EP05821857.9

申请日：2005-12-13

申请人： ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

发明人： KIM, Byoung-Gi ,  KANG, Kun-Seok ,  AHN, Do-Seob ,  LEE, Ho-Jin

IPC分类号： H04B7/26

CPC分类号： H04L25/0208 ,  H04B1/712 ,  H04B2201/70701 ,  H04L25/0228

摘要： Provided is a channel estimation method based on pilot diversity. The method includes the steps of extracting pilot symbols of a secondary common control physical channel (S-CCPCH) which is despreaded, calculating a mean value of the pilot symbols of the S-CCPCH, calculating a power ratio of the pilot symbols of the S-CCPCH, those of a dedicated physical control channel (DPCCH), and those of a common pilot channel (CPICH), and assigning weights to the pilot symbols of the S-CCPCH, those of the DPCH, and those of the CPICH.

公开(公告)号：EP1677439A2

公开(公告)日：2006-07-05

申请号：EP06100092.3

申请日：2006-01-04

申请人： TEXAS INSTRUMENTS INC.

发明人： Magee, David P.

IPC分类号： H04B7/08 ,  H04L25/02

CPC分类号： H04B7/02 ,  H04B7/084 ,  H04L25/0204 ,  H04L25/0208 ,  H04L25/0226 ,  H04L27/2613 ,  H04L27/2679

摘要： The present invention provides a post-channel estimate phase corrector for use with a multiple-input, multiple-output (MIMO) receiver employing M receive antennas, M being at least two. In one embodiment, the post-channel estimate phase corrector includes a pilot sequence coordinator configured to receive a pattern of pilot sequences from the M receive antennas during data symbol time periods. The post-channel estimate phase corrector also includes a phase calculator coupled to the pilot sequence coordinator and configured to calculate phase corrections for individual channel estimates based on the pattern of pilot sequences.

摘要翻译： 本发明提供了一种与多输入多输出（MIMO）接收机一起使用的后信道估计相位校正器，其采用M个接收天线，M为至少两个。 在一个实施例中，后信道估计相位校正器包括导频序列协调器，其被配置为在数据符号时间周期期间从M个接收天线接收导频序列的模式。 后信道估计相位校正器还包括耦合到导频序列协调器并被配置为基于导频序列的模式来计算用于各个信道估计的相位校正的相位计算器。