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    A METHOD OF AND EQUIPMENT FOR COMPENSATING CARRIER FREQUENCY OFFSET IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING WIRELESS RADIO TRANSMISSION SYSTEM
    1.
    发明公开
    A METHOD OF AND EQUIPMENT FOR COMPENSATING CARRIER FREQUENCY OFFSET IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING WIRELESS RADIO TRANSMISSION SYSTEM 审中-公开
    方法和装置的载波频率的补偿偏移IN A WIRELESS正交频分复用无线电传输系统

    公开(公告)号：EP2404416A1

    公开(公告)日：2012-01-11

    申请号：EP09776417.9

    申请日：2009-03-06

    申请人： Telefonaktiebolaget L M Ericsson (publ)

    发明人： LINDGREN, Ulf ,  SAHLIN, Henrik

    IPC分类号： H04L27/26

    CPC分类号： H04L27/266 ,  H04L27/2659

    摘要： For compensating carrier frequency generation in communication equipment for radio transmission in an Orthogonal Frequency Division Multiplex, OFDM, based wireless radio communication system, in which reference signals known to the communication equipment are transmitted in a regular time repetitive manner, carrier frequency generation is compensated (63) by a calculated carrier frequency offset estimate. The carrier frequency offset estimate in the communication equipment is calculated from coarse (61) and fine carrier frequency offset estimates (62). The coarse carrier frequency offset estimate (61 ) is calculated in the frequency domain from reference symbols of a reference signal received (60) at the communication equipment and the fine carrier frequency offset estimate (62) is calculated in the time domain from reference symbols of reference signals repetitively received (60) at said communication equipment. An algorithm and an estimator module (90) for calculating a coarse carrier frequency offset are provided.

    IMPROVED PREFILTERING IN MIMO RECEIVER
    4.
    发明公开
    IMPROVED PREFILTERING IN MIMO RECEIVER 有权
    MIMO接收机中的改进预置

    公开(公告)号：EP2898603A1

    公开(公告)日：2015-07-29

    申请号：EP12884795.1

    申请日：2012-09-24

    申请人： Telefonaktiebolaget L M Ericsson (PUBL)

    发明人： SAHLIN, Henrik ,  LOPEZ, Miguel

    IPC分类号： H04B7/04 ,  H04B7/08

    CPC分类号： H04B7/0854 ,  H04B7/0413 ,  H04B7/0456 ,  H04L1/0052 ,  H04L1/0054 ,  H04L25/0204 ,  H04L25/0212 ,  H04L25/0226 ,  H04L25/024 ,  H04L25/03993

    摘要： Data signals transmitted by a plurality of transmitting antennas over a radio channel are demodulated. The method comprises receiving (202) on a plurality of receiving antennas, a first data signal, a reference signal and a second data signal, the contents of the reference signal being known a priori to the receiver. The contents of the reference signal are used for calculating (204) an estimated polynomial channel matrix and a time reversed version of the same. Polynomial pre-filter matrices are calculated (206, 208) by a decomposition of the estimated polynomial channel matrices into a respective product of a paraunitary polynomial matrix and an upper triangular polynomial matrix with minimum phase filters on its main diagonal, where the polynomial pre-filter matrices are obtained by calculating the paraconjugate of the paraunitary polynomial matrices. The received data signals are demodulated (212) where the received data signals are multiplied with the calculated polynomial pre-filter matrices.

    摘要翻译： 通过无线电信道由多个发射天线发射的数据信号被解调。 该方法包括在多个接收天线上接收（202）第一数据信号，参考信号和第二数据信号，参考信号的内容在接收机之前是已知的。 参考信号的内容用于计算（204）估计多项式信道矩阵及其时间反转版本。 通过将估计的多项式信道矩阵分解成在其主对角线上具有最小相位滤波器的一个超对称多项式矩阵和一个上三角多项式矩阵的相应乘积来计算（206,208）多项式预滤波器矩阵， 滤波器矩阵是通过计算paraunitary多项式矩阵的paraconjugate获得的。 所接收的数据信号被解调（212），其中所接收的数据信号与所计算的多项式预滤波器矩阵相乘。

    METHODS AND ARRANGEMENTS IN A WIRELESS COMMUNICATION SYSTEM FOR PRODUCING SIGNAL STRUCTURE WITH CYCLIC PREFIX
    7.
    发明授权
    METHODS AND ARRANGEMENTS IN A WIRELESS COMMUNICATION SYSTEM FOR PRODUCING SIGNAL STRUCTURE WITH CYCLIC PREFIX 有权
    用于产生具有循环前缀的信号结构的无线通信系统中的方法和装置

    公开(公告)号：EP2286562B1

    公开(公告)日：2011-11-16

    申请号：EP08767178.0

    申请日：2008-06-13

    申请人： Telefonaktiebolaget L M Ericsson (publ)

    发明人： LARSSON, Peter ,  SAHLIN, Henrik

    IPC分类号： H04L27/26

    CPC分类号： H04L27/2607 ,  H04L1/0079 ,  H04L27/2662

    摘要： The present invention relates to methods and arrangements in a wireless communication system supporting cyclic-prefix insertion, using a symbol sequence comprising a number of samples for transmission over a radio channel that enables the handling of very large signal delay spreads. The symbol sequence is built up by a first symbol with CP and a second symbol with CP. The second symbol is a copy of the first symbol with the samples shifted in a way that makes the two adjacent symbols with CP match in regards to the sample order. The symbol sequence may also comprise a third symbol with CP or more, where the third symbol is a copy of the second symbol and with the samples shifted in analogy with the symbol shift described above. The resulting symbol sequence will thus appear as an extended continuous symbol thanks to the precise cyclic shift that matches adjacent symbols. This allows the receiver to place its FFT window anywhere during the extended symbol, e.g. at the end of the symbol sequence thus making it possible to handle a delay spread longer than the CP duration. It also allows to place e.g. two FFT windows and to combine the extracted signal into one SNR improved signal, while still handling a longer delay spread.

    摘要翻译： 本发明涉及支持循环前缀插入的无线通信系统中的方法和装置，其使用包括用于在无线电信道上传输的多个样本的符号序列，其使得能够处理非常大的信号延迟扩展。 符号序列由CP的第一个符号和CP的第二个符号组成。 第二个符号是第一个符号的副本，样本的移动方式使得两个相邻符号与CP相对于样本顺序匹配。 符号序列还可以包括具有CP或更多CP的第三符号，其中第三符号是第二符号的副本并且样本与上述符号移位类似地移位。 由于与相邻符号匹配的精确循环移位，所得到的符号序列因此将显示为扩展的连续符号。 这允许接收机在扩展符号期间的任何位置放置它的FFT窗口，例如， 在符号序列的末尾，从而可以处理比CP持续时间更长的延迟扩展。 它还允许放置例如 两个FFT窗口并且将提取的信号组合成一个SNR改善的信号，同时仍然处理较长的延迟扩展。

    SIMPLIFIED PRACH PROCEDURE USING SPECULATIVE RANDOM ACCESS RESPONSE
    8.
    发明公开
    SIMPLIFIED PRACH PROCEDURE USING SPECULATIVE RANDOM ACCESS RESPONSE 有权
    VEREINFACHTES PRACH-VERFAHREN MITTELS SPEKULATIVE DIREKTZUGRIFFSANTWORT

    公开(公告)号：EP2865233A1

    公开(公告)日：2015-04-29

    申请号：EP12728100.4

    申请日：2012-06-21

    申请人： Telefonaktiebolaget L M Ericsson (Publ)

    发明人： OLSSON, Thomas ,  SAHLIN, Henrik ,  BRAUER, Peter ,  CARLSSON, Roland ,  ENGDAL, David ,  CARLSSON, Anders ,  SVENSSON, Jim

    IPC分类号： H04W74/00

    CPC分类号： H04W74/0833 ,  H04W72/04 ,  H04W74/002

    摘要： The present invention relates to method and arrangement in cellular mobile communication systems, in particular for handling of a physical random access channel for example in a Long Term Evolution communication network. By sending to at least one user equipment (101), UE, in a communication network cell (105) an un-solicited speculative random access response, RAR, message comprising information relating to at least one of pre-amble identifier, allocated UE identifier, and uplink resource allocation data for L2/L3 message, it is possible to reduce the complexity of the access node (102), e.g. an eNodeB.

    摘要翻译： 本发明涉及蜂窝移动通信系统中的方法和装置，特别是用于处理例如长期演进通信网络中的物理随机接入信道。 通过向通信网络小区中的至少一个用户设备UE发送未请求的推测性随机接入响应RAR消息，其包括与前同步标识符，分配的UE标识符和上行链路资源分配数据中的至少一个有关的信息 对于L2 / L3消息，可以降低接入节点的复杂度，例如 一个eNodeB。

    BLOCK DECODING USING OVERLAPPING AND ADD
    9.
    发明公开
    BLOCK DECODING USING OVERLAPPING AND ADD 审中-公开
    具有交叠和添加模块解码

    公开(公告)号：EP2529523A1

    公开(公告)日：2012-12-05

    申请号：EP11703290.4

    申请日：2011-01-26

    申请人： Telefonaktiebolaget L M Ericsson (PUBL)

    发明人： LOPEZ, Miguel ,  SAHLIN, Henrik

    IPC分类号： H04L25/02 ,  H04L27/26

    CPC分类号： H04L25/0224 ,  H04L27/2605

    摘要： By exploiting the multi -block structure of the used slot format having a training sequence in the time domain and at least one pre-coded user data block to sequentially reconstruct the slot, using in the first step known symbols and using detected symbols in each subsequent step and improved receiver can be provided. This can result in less ISl/lBI and therefore increased performance. A training sequence known at the receiver is used for channel estimation. The channel estimation is used to reconstruct the value of the received block containing the training sequence. The reconstructed block is subtracted from the received block and an overlapping and add algorithm is applied to the substracted result and the previous block. Finally, the method is recursively applied for the preceedings blocks.