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    TECHNIQUE FOR CALIBRATING A RECEIVER APPARATUS
    1.
    发明申请
    TECHNIQUE FOR CALIBRATING A RECEIVER APPARATUS 审中-公开
    用于校准接收器设备的技术

    公开(公告)号：WO2013156044A1

    公开(公告)日：2013-10-24

    申请号：PCT/EP2012/001723

    申请日：2012-04-20

    Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) ,  WILHELMSSON, Leif ,  STRANDBERG, Roland ,  SVENSSON, Jim

    Inventor： WILHELMSSON, Leif ,  STRANDBERG, Roland ,  SVENSSON, Jim

    IPC: H04L27/38

    CPC classification number: H04B17/10 ,  H04B1/10 ,  H04L27/3863

    Abstract: A technique for calibrating a receiver apparatus comprising at least one analog signal processing component and an intermediate frequency, or IF, mixer for converting IF signals comprising an in-phase, or I, signal and a quadrature-phase, or Q, signal to baseband frequency signals is provided. The IF mixer is arranged downstream of the at least one analog signal processing component. A method implementation of the technique comprises the steps of determining, in a digital processing domain downstream of the IF mixer, a metric which is affected by a frequency dependency of an imbalance between I and the Q signal, or IQ-imbalance, over a signal bandwidth, generating, based on the metric thus determined, a calibration signal configured to at least partially compensate a frequency-dependency of the IQ imbalance, and feeding the calibration signal to the at least one analog signal processing component so as to calibrate the at least one analog signal processing component.

    Abstract translation: 一种用于校准接收机装置的技术，包括至少一个模拟信号处理部件和中频或IF混频器，用于将包括同相或I信号和正交相位或Q信号的IF信号转换成基带 提供频率信号。 IF混合器布置在至少一个模拟信号处理部件的下游。 该技术的方法实现包括以下步骤：在IF混合器的下游的数字处理域中，确定受信号I和Q信号之间的不平衡或IQ不平衡的频率依赖性的影响的度量 带宽，基于如此确定的度量产生校准信号，所述校准信号被配置为至少部分地补偿IQ不平衡的频率依赖性，以及将所述校准信号馈送到所述至少一个模拟信号处理组件，以至少校准 一个模拟信号处理组件。

    CELLULAR COMMUNICATION SYSTEM SUPPORT FOR LIMITED BANDWIDTH COMMUNICATION DEVICES
    3.
    发明申请
    CELLULAR COMMUNICATION SYSTEM SUPPORT FOR LIMITED BANDWIDTH COMMUNICATION DEVICES 审中-公开
    用于有限的带宽通信设备的蜂窝通信系统支持

    公开(公告)号：WO2013000814A2

    公开(公告)日：2013-01-03

    申请号：PCT/EP2012/061969

    申请日：2012-06-21

    Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) ,  LINDOFF, Bengt ,  WALLÉN, Anders ,  WILHELMSSON, Leif ,  ERIKSSON, Erik ,  AXMON, Joakim

    Inventor： LINDOFF, Bengt ,  WALLÉN, Anders ,  WILHELMSSON, Leif ,  ERIKSSON, Erik ,  AXMON, Joakim

    IPC: H04W48/12

    CPC classification number: H04W72/0493 ,  H04L5/00 ,  H04L5/0053 ,  H04W48/12 ,  H04W48/16

    Abstract: A network node that serves a host cell in a cellular communication system transmits, at (a) first time interval(s), first control channel information on a control channel that extends over a first bandwidth of a radiofrequency spectrum. The first control channel communicates information necessary to enable a first type of communication device to receive data from the host cell. The first type of communication device can receive first bandwidth-wide signals. At (a) second time interval(s), second control channel information is transmitted on a second control channel of a first M-cell. The second control channel occupies a second bandwidth that is smaller than the first bandwidth. The second time interval(s) do(es) not coincide with any of the first time interval(s). A second type of communication device having reduced receive bandwidth capabilities compared to those of the first type of communication device is thereby made capable of being served by the node.

    Abstract translation: 服务于蜂窝通信系统中的主机小区的网络节点在（a）第一时间间隔处，在通过射频频谱的第一带宽延伸的控制信道上发送第一控制信道信息。 第一控制信道传送使得第一类型的通信设备能够从主机小区接收数据所需的信息。 第一类通信设备可以接收第一带宽信号。 在（a）第二时间间隔，在第一M单元的第二控制信道上发送第二控制信道信息。 第二控制信道占用小于第一带宽的第二带宽。 第二时间间隔（s）与第一时间间隔（s）中的任一个不一致。 与第一类型的通信设备相比，具有降低的接收带宽能力的第二类型的通信设备由此能够被节点服务。

    METHODS AND ARRANGEMENTS FOR ESTIMATING IQ-IMBALANCE
    4.
    发明申请
    METHODS AND ARRANGEMENTS FOR ESTIMATING IQ-IMBALANCE 审中-公开
    估计智商不平等的方法和安排

    公开(公告)号：WO2009124953A1

    公开(公告)日：2009-10-15

    申请号：PCT/EP2009/054183

    申请日：2009-04-08

    Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) ,  ANDGART, Niklas ,  WILHELMSSON, Leif

    Inventor： ANDGART, Niklas ,  WILHELMSSON, Leif

    IPC: H04L27/26

    CPC classification number: H04L27/3863 ,  H04L5/0007 ,  H04L5/0048 ,  H04L5/0066 ,  H04L25/0226 ,  H04L25/0228 ,  H04L25/0236 ,  H04L27/2613 ,  H04L27/2647

    Abstract: An arrangement for estimating IQ-imbalance of a received OFDM- signal is disclosed. The arrangement comprises an FFT-unit (410) adapted to transform the received OFDM-signal to a frequency domain. The frequency domain comprises a plurality of sub-carrier frequencies, and the transformed received OFDM-signal comprises pilot symbols on one or more sub-carrier frequencies and symbols other than pilot symbols on one or more other sub-carrier frequencies. The arrangement also comprises channel estimation circuitry (430, 445), and an IQ-imbalance estimation unit (440) adapted to estimate the IQ-imbalance based on at least one of the pilot symbols, a determined estimated channel value for the sub- carrier frequency of the at least one pilot symbol, an estimate of the transmitted information symbol on the corresponding mirror sub-carrier frequency associated with the at least one pilot symbol and an estimated channel value for the corresponding mirror sub-carrier frequency associated with the at least one pilot symbol. Wherein the corresponding mirror sub-carrier frequency comprises a symbol other than a pilot symbol. A corresponding method and a computer program product are also disclosed.

    Abstract translation: 公开了一种用于估计接收的OFDM信号的IQ不平衡的装置。 该装置包括适于将所接收的OFDM信号变换为频域的FFT单元（410）。 频域包括多个子载波频率，并且经变换的接收OFDM信号包括在一个或多个子载波频率上的导频符号和除一个或多个其它子载波频率上的导频符号之外的符号。 该布置还包括信道估计电路（430,445）和适用于基于导频符号中的至少一个估计IQ不平衡的IQ不平衡估计单元（440），确定的子载波的估计信道值 所述至少一个导频符号的频率，与所述至少一个导频符号相关联的对应的镜像子载波频率上的所发送的信息符号的估计以及与所述至少一个导频符号相关联的对应的镜像子载波频率的估计信道值 一个导频符号。 其中相应的镜像子载波频率包括除导频符号之外的符号。 还公开了相应的方法和计算机程序产品。

    DETERMINING A FREQUENCY ERROR IN A RECEIVER OF A WIRELESS COMMUNICATIONS SYSTEM
    7.
    发明申请
    DETERMINING A FREQUENCY ERROR IN A RECEIVER OF A WIRELESS COMMUNICATIONS SYSTEM 审中-公开
    确定无线通信系统接收器中的频率错误

    公开(公告)号：WO2008135541A1

    公开(公告)日：2008-11-13

    申请号：PCT/EP2008/055454

    申请日：2008-05-05

    Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) ,  LINDOFF, Bengt ,  NORDSTRÖM, Fredrik ,  WILHELMSSON, Leif

    Inventor： LINDOFF, Bengt ,  NORDSTRÖM, Fredrik ,  WILHELMSSON, Leif

    IPC: H04L27/26

    CPC classification number: H04L27/2657 ,  H04L27/2613 ,  H04L27/2675

    Abstract: A frequency error of received signals in an OFDM receiver of a wireless communications system is determined. Symbols of a given duration are transmitted as cells on sub-carrier frequencies; and some of the cells are pilot cells modulated with reference information. The method comprises the steps of selecting at least three pilot cells (p 0 , p 1 , p 2 ) from different symbols and different sub-carriers; determining the symbol and the sub-carrier on which each pilot cell is transmitted; determining for each pilot cell a phase difference between received and generated signals; calculating therefrom a change in phase difference (Φ x ) caused by the frequency error; and calculating the frequency error from the calculated change in phase difference (Φ x ). In this way a receiver capable of determining a frequency error also in situations where only a short data burst, such as a single resource block, is available for the estimation is provided.

    Abstract translation: 确定无线通信系统的OFDM接收机中的接收信号的频率误差。 给定持续时间的符号作为小区在子载波频率上发送; 并且一些小区是用参考信息调制的导频小区。 该方法包括以下步骤：从不同的符号和不同的子像素中选择至少三个导频小区（p 0，0，p 1，p 2， 运营商; 确定发送每个导频小区的符号和子载波; 为每个导频小区确定接收和产生的信号之间的相位差; 由此计算由频率误差引起的相位差（F×x×）的变化; 以及根据所计算的相位差的变化（F x x S）计算频率误差。 以这种方式，能够在只有短数据突发（例如单个资源块）可用于估计的情况下也能够确定频率误差的接收机被提供。

    UPLINK INTER-CARRIER INTERFERENCE CANCELLATION FOR OFDMA SYSTEMS
    8.
    发明申请
    UPLINK INTER-CARRIER INTERFERENCE CANCELLATION FOR OFDMA SYSTEMS 审中-公开
    用于OFDMA系统的UPLINK INTER-CARRIER INTERFERENCE CANCELLATION OF OFDMA SYSTEMS

    公开(公告)号：WO2008074730A1

    公开(公告)日：2008-06-26

    申请号：PCT/EP2007/063933

    申请日：2007-12-14

    Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (publ) ,  WILHELMSSON, Leif ,  NEVALAINEN, Andreas ,  SVENSSON, Jim

    Inventor： WILHELMSSON, Leif ,  NEVALAINEN, Andreas ,  SVENSSON, Jim

    IPC: H04L25/03 ,  H04L27/26

    CPC classification number: H04L25/03159 ,  H04L5/023 ,  H04L25/03006 ,  H04L27/2657 ,  H04L2025/03414

    Abstract: Inter-carrier interference (ICI) cancellation in an OFDMA receiving signals from two transmitters is performed by identifying the transmitted sub-carriers that cause the largest ICI to sub-carriers received from other transmitters, and removing the ICI contribution from these sub- carriers. This may be accomplished by calculating the ICI terms only based on the interfering sub-carrier and the frequency offset. Alternatively, the transmissions causing the ICI are demodulated, the ICI on other signals is then determined and subtracted, and other signals are then demodulated. Which transmissions cause the largest ICI on others depends on the relative strength of the corresponding sub-carriers and how much orthogonality is lost. The latter might be due to frequency error, Doppler spread, or a combination of both.

    Abstract translation: 通过识别从其他发射机接收到的最大ICI到子载波的发送子载波，并从这些子载波中移除ICI贡献，来执行来自两个发射机的OFDMA接收信号中的载波间干扰（ICI）消除。 这可以通过仅基于干扰子载波和频率偏移来计算ICI项来实现。 或者，导致ICI的传输被解调，然后确定和减去其他信号上的ICI，然后解调其他信号。 哪些传输导致其他最大的ICI取决于相应副载波的相对强度以及丢失多少正交性。 后者可能是由于频率误差，多普勒扩展或两者的组合。

    SIGNAL GENERATING UNIT AND SIGNAL RECEIVING UNIT
    9.
    发明申请
    SIGNAL GENERATING UNIT AND SIGNAL RECEIVING UNIT 审中-公开
    信号发生单元和信号接收单元

    公开(公告)号：WO2007068742A1

    公开(公告)日：2007-06-21

    申请号：PCT/EP2006/069727

    申请日：2006-12-14

    Applicant: Telefonaktiebolaget L M Ericsson (publ) ,  LINDOFF, Bengt ,  WILHELMSSON, Leif

    Inventor： LINDOFF, Bengt ,  WILHELMSSON, Leif

    IPC: H04L27/26

    CPC classification number: H04L27/2626 ,  H04L27/2647

    Abstract: A signal generating unit (100) is provided for generating signals. The signal generating unit comprises an IFFT unit (101) for generating an output signal; a filter unit (102) operatively connected to the IFFT unit; and a subtractor (103) operatively connected to the IFFT unit and to the filter unit, said subtractor being adapted to subtract the interference from the output signal. A signal receiving unit (200, 300) is provided for receiving signals. The signal generating unit comprises a filter unit (202, 302); a subtractor (203, 303) operatively connected to the filter unit; and an FFT unit (201, 301) operatively connected to the subtractor. Methods for receiving and generating signals are also provided.

    Abstract translation: 信号生成单元（100）用于产生信号。 信号发生单元包括用于产生输出信号的IFFT单元（101） 可操作地连接到IFFT单元的滤波器单元（102）; 以及可操作地连接到IFFT单元和滤波器单元的减法器（103），所述减法器适于从输出信号中减去干扰。 信号接收单元（200,300）用于接收信号。 信号产生单元包括滤波器单元（202,302）; 可操作地连接到过滤器单元的减法器（203,303）; 以及可操作地连接到减法器的FFT单元（201,301）。 还提供了接收和产生信号的方法。

    INITIAL PARAMETER ESTIMATION IN OFDM SYSTEMS
    10.
    发明申请
    INITIAL PARAMETER ESTIMATION IN OFDM SYSTEMS 审中-公开
    OFDM系统中的初始参数估计

    公开(公告)号：WO2006111275A3

    公开(公告)日：2007-01-04

    申请号：PCT/EP2006003173

    申请日：2006-04-07

    Applicant: ERICSSON TELEFON AB L M ,  BERKEMAN ANDERS ,  SVENSSON JIM ,  WILHELMSSON LEIF

    Inventor： BERKEMAN ANDERS ,  SVENSSON JIM ,  WILHELMSSON LEIF

    IPC: H04L27/26 ,  H04L1/20

    CPC classification number: H04L25/0232 ,  H04L25/0216 ,  H04L25/022 ,  H04L25/0234 ,  H04L27/2647 ,  H04L27/2665

    Abstract: A coarse estimate of a location of an information carrying part of a symbol in a received signal in a telecommunication system is generated. This involves generating correlation values by correlating the received signal with a delayed received signal. A maximum correlation value of the correlation values is identified, and a duration in time during which the correlation values are greater than or equal to a predetermined percentage of the maximum correlation value is identified, wherein the duration in time begins at a first moment in time and ends at a second moment in time. The coarse estimate of the location of the peak correlation value is set equal to a moment in time between the first moment in time and the second moment in time, for example, a midpoint between the first moment in time and the second moment in time.

    Abstract translation: 产生在电信系统中的接收信号中承载符号部分的信息的位置的粗略估计。 这涉及通过将接收的信号与延迟的接收信号相关来产生相关值。 识别相关值的最大相关值，并且识别相关值大于或等于最大相关值的预定百分比的时间持续时间，其中时间持续时间从第一时刻开始 并在第二时刻结束。 将峰值相关值的位置的粗略估计设置为等于第一时刻与第二时刻之间的时刻，例如，第一时刻与第二时刻之间的中点。

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