公开(公告)号：US08619713B2

公开(公告)日：2013-12-31

申请号：US12983636

申请日：2011-01-03

申请人： Jianglei Ma ,  Ming Jia ,  Peiying Zhu ,  Wen Tong ,  Dong-Sheng Yu

发明人： Jianglei Ma ,  Ming Jia ,  Peiying Zhu ,  Wen Tong ,  Dong-Sheng Yu

IPC分类号： H04W4/00 ,  H04J11/00 ,  H04J1/00

CPC分类号： H04W36/18 ,  H04B7/022 ,  H04L1/0618 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/0025 ,  H04L5/0037 ,  H04L5/0044 ,  H04L5/0048 ,  H04L25/0232 ,  H04L27/2613 ,  H04L27/2626 ,  H04L27/2647 ,  H04L27/2655

摘要： The present invention relates to soft handoffs in an OFDM system. Each mobile terminal measures pilot signal strengths of transmissions from adjacent base stations. If the pilot signal strength for a base station exceeds the defined threshold, that base station is added to an active set list. Each mobile terminal notifies the base stations of their active set lists. By providing the set list to the base station controller and the servicing base station, the mobile terminal identifies the sole servicing base station or triggers a soft handoff mode when multiple base stations appear on the active set list. The soft handoff mode uses a combination of scheduling and space-time coding to affect efficient and reliable handoffs.

摘要翻译： 本发明涉及OFDM系统中的软切换。 每个移动终端测量来自相邻基站的传输的导频信号强度。 如果基站的导频信号强度超过定义的阈值，则该基站被添加到活动集列表中。 每个移动终端向基站通知其活动集列表。 通过将设置列表提供给基站控制器和服务基站，移动终端识别唯一服务基站，或者当多个基站出现在活动集列表上时触发软切换模式。 软切换模式使用调度和时空编码的组合来影响有效和可靠的切换。

公开(公告)号：US08612502B2

公开(公告)日：2013-12-17

申请号：US12052248

申请日：2008-03-20

申请人： Petru Cristian Budianu ,  Hermanth Sampath ,  Alexei Gorokhov ,  Dhananjay A. Gore

发明人： Petru Cristian Budianu ,  Hermanth Sampath ,  Alexei Gorokhov ,  Dhananjay A. Gore

IPC分类号： G06F7/38

CPC分类号： H04L5/023 ,  H04L25/0232 ,  H04L25/0244 ,  H04L25/03019 ,  H04L27/2647 ,  H04L2025/03414 ,  H04L2025/03426

摘要： Systems and methodologies are described that facilitate equalization of received signals in a wireless communication environment. Multiple transmit and/or receive antennas and utilize MIMO technology to enhance performance. A single tile of transmitted data, including a set of modulation symbols, can be received at multiple receive antennas, resulting in multiple tiles of received modulation symbols. Corresponding modulation symbols from multiple received tiles can be processed as a function of channel and interference estimates to generate a single equalized modulation symbol. Typically, the equalization process is computationally expensive. However, the channels are highly correlated. This correlation is reflected in the channel estimates and can be utilized to reduce complex equalization operations. In particular, a subset of the equalizers can be generated based upon the equalizer function and the remainder can be generated using interpolation. In addition, the equalizer function itself can be simplified.

摘要翻译： 描述了促进无线通信环境中的接收信号的均衡的系统和方法。 多个发射和/或接收天线并利用MIMO技术来提高性能。 可以在多个接收天线处接收包括一组调制符号的传输数据的单个瓦片，从而导致接收到的调制符号的多个瓦片。 来自多个接收瓦片的相应调制符号可以作为信道和干扰估计的函数来处理，以生成单个均衡调制符号。 通常，均衡过程在计算上是昂贵的。 然而，这些渠道是高度相关的。 该相关性反映在信道估计中，并且可以用于减少复数均衡操作。 特别地，可以基于均衡器功能生成均衡器的子集，并且可以使用插值来生成余数。 此外，均衡器功能本身可以简化。

公开(公告)号：US08611444B2

公开(公告)日：2013-12-17

申请号：US13166787

申请日：2011-06-22

申请人： Shih-Yi Shih

发明人： Shih-Yi Shih

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H04L25/0204 ,  H04L25/022 ,  H04L25/0232 ,  H04L25/03159 ,  H04L25/03821 ,  H04L27/2647

摘要： A signal receiving method of a receiver includes the following steps. A time-domain received signal is transformed into a frequency-domain received signal, which includes multiple pilot symbols and multiple data symbols. Multiple channel impulse responses corresponding to the pilot symbols are estimated. Multiple inter-carrier interference and inter-block interference (ICIIBI) values corresponding to the pilot symbols are estimated based on the pilot symbols and the corresponding channel impulse responses. Multiple ICIIBI values corresponding to the data symbols are obtained via an interpolation operation according to the ICIIBI values corresponding to the pilot symbols. The estimated corresponding ICIIBI values are cancelled from the data symbols. The interference-cancelled data symbols are demapped to obtain soft-decision or hard-decision bits.

摘要翻译： 接收机的信号接收方法包括以下步骤。 时域接收信号被变换成包括多个导频符号和多个数据符号的频域接收信号。 估计对应于导频符号的多信道脉冲响应。 基于导频符号和对应的信道脉冲响应来估计与导频符号相对应的多个载波间干扰和块间干扰（ICIIBI）值。 通过根据对应于导频符号的ICIIBI值的内插操作来获得与数据符号对应的多个ICIIBI值。 从数据符号中取消估计的对应的ICIIBI值。 被干扰消除的数据符号被解映射以获得软判决或硬判决位。

公开(公告)号：US20130322283A1

公开(公告)日：2013-12-05

申请号：US13960601

申请日：2013-08-06

申请人： TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)

发明人： Jung-Fu Cheng

IPC分类号： H04W24/02 ,  H04B7/04

CPC分类号： H04W24/02 ,  H04B7/024 ,  H04B7/0413 ,  H04L25/0218 ,  H04L25/022 ,  H04L25/0232

摘要： A plurality of wireless channels link a transmitter and a receiver, each channel corresponding to a different transmit-receive antenna pair. Channel state information is estimated for the plurality of wireless channels by grouping the plurality of channels into one or more groups, each group including the channels associated with two or more collocated transmit and/or receive antennas. A set of delay tap values is iteratively estimated in the time domain for each group of channels so that the channels included in the same group are associated with the same delay tap values. A frequency domain channel response of each of the channels included in the same group of channels is estimated based on the set of delay tap values estimated for the group.

摘要翻译： 多个无线信道链接发射机和接收机，每个信道对应于不同的发射 - 接收天线对。 通过将多个信道分组成一个或多个组来估计多个无线信道的信道状态信息，每个组包括与两个或多个并置的发射和/或接收天线相关联的信道。 在每个通道组的时域中迭代地估计一组延迟抽头值，使得包括在同一组中的信道与相同的延迟抽头值相关联。 基于针对组估计的延迟抽头值的集合来估计包括在同一组信道组中的每个信道的频域信道响应。

公开(公告)号：US08588276B2

公开(公告)日：2013-11-19

申请号：US13333463

申请日：2011-12-21

申请人： Jianglei Ma ,  Ming Jia ,  Wen Tong ,  Peiying Zhu ,  Hua Xu ,  Hang Zhang ,  Mo-Han Fong

发明人： Jianglei Ma ,  Ming Jia ,  Wen Tong ,  Peiying Zhu ,  Hua Xu ,  Hang Zhang ,  Mo-Han Fong

IPC分类号： H04B1/707

CPC分类号： H04J13/0003 ,  H04B1/707 ,  H04B7/0404 ,  H04B7/0678 ,  H04J13/00 ,  H04J13/16 ,  H04L5/0016 ,  H04L5/0026 ,  H04L5/0048 ,  H04L5/005 ,  H04L25/0204 ,  H04L25/0226 ,  H04L25/0232 ,  H04L25/03866 ,  H04L27/2613 ,  H04L27/2627 ,  H04W72/044

摘要： In some embodiments of the invention, OFDM symbols are transmitted as a plurality of clusters. A cluster includes a plurality of OFDM sub-carriers in frequency, over a plurality of OFDM symbol durations in time. Each cluster includes data as well as pilot information as a reference signal for channel estimation. In some embodiments, a plurality of clusters collectively occupy the available sub-carrier set in the frequency domain that is used for transmission. In some embodiments of the invention data and/or pilots are spread within each cluster using code division multiplexing (CDM). In some embodiments pilots and data are separated by distributing data on a particular number of the plurality of OFDM symbol durations and pilots on a remainder of the OFDM symbol durations. CDM spreading can be performed in time and/or frequency directions.

摘要翻译： 在本发明的一些实施例中，OFDM符号作为多个簇发送。 在多个OFDM符号持续时间内，群集包括频率上的多个OFDM子载波。 每个簇包括数据以及作为信道估计的参考信号的导频信息。 在一些实施例中，多个集群共同地占用用于传输的频域中的可用子载波集合。 在本发明的一些实施例中，使用码分多路复用（CDM）在每个簇内扩展数据和/或导频。 在一些实施例中，通过在OFDM码元持续时间的其余部分上分配关于多个OFDM符号持续时间的特定数目和导频上的数据来分离导频和数据。 可以在时间和/或频率方向上执行CDM扩展。

公开(公告)号：US08571132B2

公开(公告)日：2013-10-29

申请号：US11315744

申请日：2005-12-21

申请人： Aamod Khandekar ,  Avneesh Agrawal

发明人： Aamod Khandekar ,  Avneesh Agrawal

IPC分类号： H04L27/00 ,  H04L27/06 ,  H04J7/00

CPC分类号： H04B1/713 ,  H04B7/02 ,  H04L1/0029 ,  H04L5/0023 ,  H04L5/0039 ,  H04L5/0044 ,  H04L5/0048 ,  H04L5/006 ,  H04L5/0094 ,  H04L25/0204 ,  H04L25/0226 ,  H04L25/0232

摘要： Embodiments described provide for channel estimation and resource allocation for a transmission to a wireless device. The frequency band is partitioned into at least two contiguous subbands. A determination is made whether it is desirable to transmit in a single subband or in more than one subband. The transmission is assigned to occur in either the single subband or to operate in more than one subband. If the transmission is restricted to one subband, the hop pattern is also restricted to subcarriers within the particular subband.

摘要翻译： 所描述的实施例提供了用于向无线设备的传输的信道估计和资源分配。 将频带划分为至少两个连续的子带。 确定是否希望在单个子带中或在多于一个子带中进行发送。 传输被分配发生在单个子带中或在多个子带中操作。 如果传输被限制到一个子带，则跳频模式也被限制在特定子带内的子载波上。

公开(公告)号：US08520783B2

公开(公告)日：2013-08-27

申请号：US13046290

申请日：2011-03-11

申请人： Masataka Umeda

发明人： Masataka Umeda

IPC分类号： H04L27/06

CPC分类号： H04L25/0216 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/022 ,  H04L25/0222 ,  H04L25/0232 ,  H04L27/265 ,  H04L27/2662

摘要： A receiving device includes: a receiver that receives frequency multiplex signal; a first Fourier transformation unit that transforms the received frequency multiplex signal to frequency domain signal; a first time-domain waveform generator that generates a first time-domain waveform by performing inverse Fourier transformation of a plurality of pilot signals which are inserted into the frequency multiplex signal; a second time-domain waveform generator that generates a second time-domain waveform having an aliasing period on the basis of the received frequency multiplex signal; a second Fourier transformation unit that synthesizes the first time-domain waveform to the second time-domain waveform and transforms the synthesized time-domain waveform to frequency-domain information; and a propagation-path compensation unit that compensates a propagation-path of the frequency multiplex signal which is output from the first Fourier transformation unit in accordance with information transformed by the second Fourier transformation unit.

摘要翻译： 接收装置包括：接收频率复用信号的接收机; 第一傅立叶变换单元，将接收到的频率复用信号变换为频域信号; 第一时域波形发生器，其通过对插入到所述频率复用信号中的多个导频信号进行逆傅里叶变换来生成第一时域波形; 第二时域波形发生器，其基于接收到的频率复用信号生成具有混叠周期的第二时域波形; 第二傅立叶变换单元，将第一时域波形合成到第二时域波形，并将合成的时域波形变换为频域信息; 以及传播路径补偿单元，其根据由第二傅立叶变换单元变换的信息来补偿从第一傅里叶变换单元输出的频率复用信号的传播路径。

公开(公告)号：US08514970B2

公开(公告)日：2013-08-20

申请号：US13753215

申请日：2013-01-29

申请人： Sharp Kabushiki Kaisha

发明人： Kimihiko Imamura ,  Yasuhiro Hamaguchi ,  Yasuyuki Kato ,  Daiichiro Nakashima

IPC分类号： H04L27/00 ,  H04L25/03

CPC分类号： H04L25/0232 ,  H04B7/0671 ,  H04L1/0033 ,  H04L1/0042 ,  H04L1/04 ,  H04L5/0044 ,  H04L25/0204 ,  H04L25/022 ,  H04L27/2626 ,  H04L27/2627 ,  H04L27/2647 ,  H04L27/265

摘要： A multicarrier-signal transmitting apparatus comprising a rotation-amount setting unit configured to set a phase rotation amount for each subcarrier of a plurality of subcarrier groups, the phase rotation amount being set with a setting selected from a first setting and a second setting, the first setting being such that the phase rotation amount is identical for a plurality of subcarriers within each subcarrier group, and the second setting being such that the phase rotation amount is identical for a plurality of subcarriers within a plurality of subcarrier groups; and a phase rotator configured to add a phase rotation to a data signal of said each subcarrier of said plurality of subcarrier groups based on the phase rotation amount.

摘要翻译： 一种多载波信号发送装置，包括：旋转量设定单元，被配置为对多个子载波组中的每个子载波设定相位旋转量，所述相位旋转量被设定为从第一设定和第二设定中选择的设定， 第一设定使得每个子载波组内的多个子载波的相位旋转量相同，第二设定使得多个子载波组内的多个子载波的相位旋转量相同; 以及相位旋转器，被配置为基于相位旋转量将相位旋转相加于所述多个子载波组中的所述每个子载波的数据信号。

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。

公开(公告)号：US08451919B2

公开(公告)日：2013-05-28

申请号：US12438051

申请日：2008-01-08

申请人： Yoshinobu Matsumura ,  Tomohiro Kimura

发明人： Yoshinobu Matsumura ,  Tomohiro Kimura

IPC分类号： H04K1/10

CPC分类号： H04W52/282 ,  H04B7/12 ,  H04L25/022 ,  H04L25/0232 ,  H04L25/03159 ,  H04L25/03821 ,  H04L27/2647 ,  H04W52/24

摘要： An OFDM reception apparatus effectively suppresses a reduction in reception performance during high-speed mobile reception. The OFDM reception apparatus includes a transmission channel characteristic estimating unit for calculating a transmission channel characteristic value indicating phase and amplitude distortions in an OFDM signal for each sub-carrier, the phase and amplitude distortions occurring during propagation through a transmission channel, and calculating an n-th differentiation of the transmission channel characteristic value, and an interference component removing unit for using the transmission channel characteristic value and the n-th differentiation calculated for each of the sub-carriers by the transmission channel characteristic estimating unit, to remove an interference component between the sub-carriers from the OFDM signal.

摘要翻译： OFDM接收装置有效地抑制了高速移动接收时的接收性能的降低。 OFDM接收装置包括传输信道特性估计单元，用于计算指示每个子载波的OFDM信号中的相位和幅度失真的传输信道特性值，在通过传输信道传播期间发生的相位和幅度失真，以及计算n 传输信道特性值的微分和干扰分量去除单元，用于通过传输信道特性估计单元使用为每个子载波计算的传输信道特性值和第n个微分，以消除干扰分量 在OFDM信号的子载波之间。