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1. 发明授权

US08594210B2 Method and apparatus for positioning an FFT-window in an OFDM-receiver 有权
标题翻译：用于在OFDM接收机中定位FFT窗口的方法和装置
公开(公告)号：US08594210B2
公开(公告)日：2013-11-26
申请号：US12746518
申请日：2008-12-08
申请人： Leif Wilhelmsson , Lars Björkman , Fredrik Nordström
发明人： Leif Wilhelmsson , Lars Björkman , Fredrik Nordström
IPC分类号： H04L27/28
CPC分类号： H04L27/2662 , H04L5/0007 , H04L25/0216 , H04L25/022 , H04L25/0232 , H04L27/2657 , H04L27/2665
摘要： Methods for positioning an FFT-window in an OFDM-receiver are disclosed as well as electronic apparatuses and computer program products for performing the methods. The method comprises determining a position of the FFT-window in relation to one or more OFDM-symbols of a received OFDM-signal, using the position of the FFT-window to obtain a first OFDM-symbol from the received OFDM-signal, and applying an FFT to the first OFDM-symbol to produce an FFT-output signal. The method also comprises determining a frequency dependent phase rotation component of the FFT-output signal, and removing the determined frequency dependent phase rotation component from the FFT-output signal to obtain a compensated FFT-output signal. A delay spread estimate is calculated based on at least one of the FFT-output signal and the compensated FFT-output signal, and the position of the FFT-window is adjusted based on at least the determined frequency dependent phase rotation component and the calculated delay spread estimate.
摘要翻译：公开了在OFDM接收机中定位FFT窗口的方法以及用于执行方法的电子设备和计算机程序产品。该方法包括使用FFT窗口的位置从接收的OFDM信号中获得第一OFDM符号来确定FFT窗口相对于接收的OFDM信号的一个或多个OFDM符号的位置，以及对第一OFDM符号应用FFT以产生FFT输出信号。该方法还包括确定FFT输出信号的频率相关相位旋转分量，以及从FFT输出信号中去除所确定的频率相关相位旋转分量以获得经补偿的FFT输出信号。基于FFT输出信号和经补偿的FFT输出信号中的至少一个来计算延迟扩展估计，并且至少基于所确定的频率相关相位旋转分量和所计算的延迟来调整FFT窗口的位置传播估计。

2. 发明申请

US20100135423A1 Determining a Frequency Error in a Receiver of a Wireless Communications System 有权
标题翻译：确定无线通信系统的接收机中的频率误差
公开(公告)号：US20100135423A1
公开(公告)日：2010-06-03
申请号：US12598613
申请日：2008-05-05
申请人： Bengt Lindoff , Leif Wilhelmsson , Fredrik Nordström
发明人： Bengt Lindoff , Leif Wilhelmsson , Fredrik Nordström
IPC分类号： H04L27/28 , H04L27/06
CPC分类号： H04L27/2657 , H04L27/2613 , H04L27/2675
摘要： 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 (p0, p1, p2) 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 (Φx) caused by the frequency error; and calculating the frequency error from the calculated change in phase difference (Φx). 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.
摘要翻译：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。该方法包括从不同符号和不同子载波中选择至少三个导频小区（p0，p1，p2）的步骤; 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（Φx）的变化; 并根据计算的相位差变化（Φx）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。

3. 发明授权

US08270509B2 Determining a frequency error in a receiver of a wireless communications system 有权
标题翻译：确定无线通信系统的接收机中的频率误差
公开(公告)号：US08270509B2
公开(公告)日：2012-09-18
申请号：US12598613
申请日：2008-05-05
申请人： Bengt Lindoff , Leif Wilhelmsson , Fredrik Nordström
发明人： Bengt Lindoff , Leif Wilhelmsson , Fredrik Nordström
IPC分类号： H04K1/10
CPC分类号： H04L27/2657 , H04L27/2613 , H04L27/2675
摘要： 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 (p0, p1, p2) 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 (Φx) caused by the frequency error; and calculating the frequency error from the calculated change in phase difference (Φx). 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.
摘要翻译：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。该方法包括从不同符号和不同子载波中选择至少三个导频小区（p0，p1，p2）的步骤; 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（Φx）的变化; 并根据计算的相位差变化（Φx）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。

4. 发明授权

US08472538B2 Method and apparatus for delay spread estimation 有权
标题翻译：用于延迟扩展估计的方法和装置
公开(公告)号：US08472538B2
公开(公告)日：2013-06-25
申请号：US12746604
申请日：2008-12-08
申请人： Leif Wilhelmsson , Bo Bernhardsson , Lars Björkman
发明人： Leif Wilhelmsson , Bo Bernhardsson , Lars Björkman
IPC分类号： H04L27/28
CPC分类号： H04L25/022 , H04L5/0048 , H04L25/0232 , H04L27/2647 , H04L27/2662
摘要： Methods for calculating a delay spread estimate in an OFDM-receiver are described, along with computer program products and electronic apparatuses for performing the methods. The methods comprise determining a position of an FFT-window in relation to one or more OFDM-symbols of a received OFDM-signal and using the determined position to obtain a first OFDM-symbol from the received OFDM-signal. An FFT is applied to the first OFDM-symbol to produce an FFT-output signal. A frequency dependent phase rotation component of the FFT-output signal is determined and removed from the FFT-output signal. A number of zero-crossings of at least one of a real component and an imaginary component of a transfer function of a channel, over which the received OFDM-signal has been transmitted, derived from the FFT-output signal where the frequency dependent phase rotation component has been removed is determined, and a delay spread estimate is calculated based on the determined number of zero-crossings.
摘要翻译：与用于执行方法的计算机程序产品和电子设备一起描述了用于计算OFDM接收机中的延迟扩展估计的方法。所述方法包括相对于所接收的OFDM信号的一个或多个OFDM符号确定FFT窗口的位置，并且使用所确定的位置从接收的OFDM信号中获得第一OFDM符号。对第一OFDM符号应用FFT以产生FFT输出信号。 FFT输出信号的频率相关相位旋转分量被确定并从FFT输出信号中去除。频率依赖相位旋转的FFT输出信号导出传输函数的传输函数的实数分量和虚分量中的至少一个的多个零交叉已经去除了分量，并且基于确定的过零点数来计算延迟扩展估计。

5. 发明申请

US20110019749A1 METHOD AND APPARATUS FOR DELAY SPREAD ESTIMATION 有权
标题翻译：延迟估计的方法和装置
公开(公告)号：US20110019749A1
公开(公告)日：2011-01-27
申请号：US12746604
申请日：2008-12-08
申请人： Leif Wilhelmsson , Bo Bernhardsson , Lars Björkman
发明人： Leif Wilhelmsson , Bo Bernhardsson , Lars Björkman
IPC分类号： H04L27/00
CPC分类号： H04L25/022 , H04L5/0048 , H04L25/0232 , H04L27/2647 , H04L27/2662
摘要： Methods for calculating a delay spread estimate in an OFDM-receiver are described, along with computer program products and electronic apparatuses for performing the methods. The methods comprise determining a position of an FFT-window in relation to one or more OFDM-symbols of a received OFDM-signal and using the determined position to obtain a first OFDM-symbol from the received OFDM-signal. An FFT is applied to the first OFDM-symbol to produce an FFT-output signal. A frequency dependent phase rotation component of the FFT-output signal is determined and removed from the FFT-output signal. A number of zero-crossings of at least one of a real component and an imaginary component of a transfer function of a channel, over which the received OFDM-signal has been transmitted, derived from the FFT-output signal where the frequency dependent phase rotation component has been removed is determined, and a delay spread estimate is calculated based on the determined number of zero-crossings.
摘要翻译：与用于执行方法的计算机程序产品和电子设备一起描述了用于计算OFDM接收机中的延迟扩展估计的方法。所述方法包括相对于所接收的OFDM信号的一个或多个OFDM符号确定FFT窗口的位置，并使用确定的位置从接收的OFDM信号中获得第一OFDM符号。对第一OFDM符号应用FFT以产生FFT输出信号。 FFT输出信号的频率相关相位旋转分量被确定并从FFT输出信号中去除。频率依赖相位旋转的FFT输出信号导出传输函数的传输函数的实数分量和虚分量中的至少一个的多个零交叉已经去除了分量，并且基于确定的过零点数来计算延迟扩展估计。

6. 发明申请

US20120219041A1 Operation of user equipment when control and data information are supplied by different radio units 有权
标题翻译：控制和数据信息由不同的无线电单元提供时，用户设备的操作
公开(公告)号：US20120219041A1
公开(公告)日：2012-08-30
申请号：US13036523
申请日：2011-02-28
申请人： Bengt Lindoff , Fredrik Nordström , Leif Wilhelmsson
发明人： Bengt Lindoff , Fredrik Nordström , Leif Wilhelmsson
IPC分类号： H04B1/38
CPC分类号： H04L25/03343 , H04L27/2646 , H04W56/0015 , H04W56/0045
摘要： An Orthogonal Frequency Division Multiplexing (OFDM) symbol for transmission from a non-reference transceiver to a user equipment (UE) in a mobile communication system is generated by ascertaining a general timing for transmission of OFDM symbols, wherein the general timing is associated with a reference transceiver. A UE timing relative to the general timing is ascertained. An initial resource element (RE) value is adjusted by a pre-compensating amount to obtain a pre-compensated RE value, wherein the pre-compensating amount is based on the UE timing relative to the general timing. The pre-compensated resource element value is supplied as one of a plurality of values to be transmitted. An IFFT is performed on the plurality of values to be transmitted to obtain pre-compensated initial signal information. A cyclic prefix is appended to the pre-compensated initial signal information to form an OFDM symbol for transmission from the non-reference transceiver to the UE.
摘要翻译：通过确定用于OFDM符号的传输的一般定时来生成用于在移动通信系统中从非参考收发器到用户设备（UE）的传输的正交频分复用（OFDM）符号，其中，一般定时与参考收发器。确定相对于一般定时的UE定时。通过预补偿量来调整初始资源元素（RE）值以获得预补偿RE值，其中预补偿量基于相对于一般定时的UE定时。预补偿资源元素值被提供为要发送的多个值之一。对要发送的多个值执行IFFT以获得预补偿的初始信号信息。将循环前缀附加到预补偿的初始信号信息以形成用于从非参考收发器到UE的传输的OFDM符号。

7. 发明授权

US08023600B2 Method and apparatus for interference rejection combining and detection 有权
标题翻译：用于干扰抑制组合和检测的方法和装置
公开(公告)号：US08023600B2
公开(公告)日：2011-09-20
申请号：US12138743
申请日：2008-06-13
申请人： Bengt Lindoff , Johan Nilsson , Fredrik Nordström , Leif Wilhelmsson
发明人： Bengt Lindoff , Johan Nilsson , Fredrik Nordström , Leif Wilhelmsson
IPC分类号： H04L1/02 , H03D1/04 , H04B15/00
CPC分类号： H04B7/086 , H04B17/345 , H04J11/005 , H04J11/0093 , H04L25/0204 , H04L25/022 , H04L25/0224 , H04L25/0242
摘要： A multi-branch OFDM receiver combines diversity signals received over different receiver branches using interference rejection combining. The receiver generates first channel estimates associated with a serving base station, second channel estimates associated with at least one non-serving base station, and a time offset between the serving base station and non-serving base station. The receiver computes a noise covariance matrix based on the second channel estimates and the time offset, and then combines the diversity signals received over different branches using the first channel estimates and the noise covariance matrix.
摘要翻译：多分支OFDM接收机使用干扰抑制组合来组合在不同接收机分支上接收的分集信号。接收机产生与服务基站相关联的第一信道估计，与至少一个非服务基站相关联的第二信道估计，以及服务基站与非服务基站之间的时间偏移。接收机基于第二信道估计和时间偏移来计算噪声协方差矩阵，然后使用第一信道估计和噪声协方差矩阵组合在不同分支上接收的分集信号。

8. 发明授权

US09882628B2 Self-interference suppression control for a relay node 有权
公开(公告)号：US09882628B2
公开(公告)日：2018-01-30
申请号：US13880533
申请日：2011-09-22
申请人： Lars Sundstrom , Leif Wilhelmsson
发明人： Lars Sundstrom , Leif Wilhelmsson
IPC分类号： H04B7/15 , H04B7/155 , H04B15/00
CPC分类号： H04B7/15585 , H04B7/155 , H04B15/00
摘要： A technique for self-interference suppression control for a relay node is provided. The relay node comprises a transmitter and a receiver, and is adapted to transmit and received simultaneously using the same frequency channel or using proximate frequency channels. The relay node further comprises an interference signal estimator having a first input adapted to receive a transmitter signal from the transmitter, a second input adapted to receive adaptation metric and an output adapted to output an estimated interference signal generated by the interference signal estimator based on the transmitter signal and the adaptation metric. A subtractor is coupled to the output of interference signal estimator and configured to subtract the estimated interference signal from a received signal in the receiver so as to actively cancel a signal transmitted from the relay node that leaks back into the receiver of the relay node to suppress self-interference.

9. 发明授权

US09461730B2 Self-interference suppression control for a relay node 有权
标题翻译：中继节点的自干扰抑制控制
公开(公告)号：US09461730B2
公开(公告)日：2016-10-04
申请号：US13880529
申请日：2011-09-22
申请人： Leif Wilhelmsson , Lars Sundström
发明人： Leif Wilhelmsson , Lars Sundström
IPC分类号： H04B7/155 , H04B15/00
CPC分类号： H04B7/15585 , H04B7/155 , H04B15/00
摘要： A technique for controlling suppression of self-interference in a relay node configured to transmit and receive simultaneously using the same frequency channel or using proximate frequency channels is provided. A method implementation of this technique comprises the steps of actively cancelling a signal transmitted from the relay node that leaks back into a receiver of the relay node to suppress self-interference, determining whether an increase of an amount of self-interference suppression is needed or whether self-interference suppression can be decreased, and increasing or decreasing, depending on the result of the determination, at least one of the transmit power of the signal transmitted from the relay node and the receive power of the relay node.
摘要翻译：提供了一种用于控制被配置为使用相同频率信道或使用接近频率信道同时发送和接收的中继节点中的自干扰抑制的技术。该技术的方法实现包括以下步骤：主动地消除从中继节点发送的信号，该信号泄漏到中继节点的接收机中以抑制自干扰，确定是否需要增加自干扰抑制量，取决于确定结果，能够减少自干扰抑制，以及根据确定结果增加或减少从中继节点发送的信号的发射功率和中继节点的接收功率中的至少一个。

10. 发明申请

US20150249937A1 METHOD FOR D2D RADIOCOMMUNICATION 有权
标题翻译： D2D无线电通信方法
公开(公告)号：US20150249937A1
公开(公告)日：2015-09-03
申请号：US14430216
申请日：2012-09-28
申请人： Bengt Lindoff , Qianxi Lu , Qingyu Miao , Leif Wilhelmsson
发明人： Bengt Lindoff , Qianxi Lu , Qingyu Miao , Leif Wilhelmsson
IPC分类号： H04W36/00 , H04W36/16 , H04W72/04 , H04W76/02 , H04W4/00
CPC分类号： H04W36/0011 , H04W4/80 , H04W36/00 , H04W36/165 , H04W72/0453 , H04W76/14 , H04W84/042
摘要： The present disclosure relates to a method of a first radio device in non-network assisted device-to-device (D2D) communication with a second radio device using a first frequency resource and a first communication protocol. The method comprises determining that the first radio device is within coverage of a cellular network. The method also comprises connecting to the cellular network. The method also comprises sending a message to the second radio device, informing said second radio device that the first radio device is within coverage of the cellular network. The method also comprises receiving a message from the cellular network comprising information about a second frequency resource and a second communication protocol. The method also comprises initiating a handover of the D2D communication from the first frequency resource and communication protocol to the second frequency resource and communication protocol.
摘要翻译：本公开涉及在使用第一频率资源和第一通信协议的第二无线电设备的非网络辅助设备到设备（D2D）通信中的第一无线电设备的方法。该方法包括确定第一无线电设备在蜂窝网络的覆盖范围内。该方法还包括连接到蜂窝网络。该方法还包括向第二无线电设备发送消息，通知所述第二无线电设备第一无线电设备在蜂窝网络的覆盖范围内。该方法还包括从蜂窝网络接收包括关于第二频率资源和第二通信协议的信息的消息。该方法还包括启动D2D通信从第一频率资源和通信协议到第二频率资源和通信协议的切换。

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