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1. 发明授权

US09954593B2 Method for transmitting reference signals in a downlink multiple input multiple output system 有权
公开(公告)号：US09954593B2
公开(公告)日：2018-04-24
申请号：US15011210
申请日：2016-01-29
申请人： LG ELECTRONICS INC.
发明人： Yu Jin Noh , Dong Wook Roh , Joon Kui Ahn , Byeong Woo Kang , Dae Won Lee , Bong Hoe Kim , Dong Youn Seo
IPC分类号： H04B7/06 , H04L5/00 , H04J11/00 , H04W24/02 , H04W72/04 , H04L25/02 , H04B7/0413
CPC分类号： H04B7/0626 , H04B7/0413 , H04J11/0053 , H04L5/0007 , H04L5/0032 , H04L5/0035 , H04L5/0048 , H04L5/005 , H04L5/0053 , H04L5/0094 , H04L25/0218 , H04L25/0226 , H04W24/02 , H04W72/0446 , H04W72/0453
摘要： A method for transmitting a reference signal for channel measurement (CSI-RS) to a user equipment; a base station therefore; a method for receiving a CSI-RS; and the user equipment therefore are discussed. The method for transmitting a CSI-RS according to one embodiment includes transmitting CSI-RS pattern information for indicating a pattern of time-frequency resource to be nulled, hereinafter referred to as null CSI-RS pattern, and CSI-RS subframe information for indicating in which subframe the null CSI-RS pattern occurs; and nulling a time-frequency resource corresponding to the null CSI-RS pattern in a subframe corresponding to the CSI-RS subframe information, hereinafter referred to as null CSI-RS subframe, based on the CSI-RS pattern information and the CSI-RS subframe information. The CSI-RS subframe information includes information indicating a periodic interval with which the null CSI-RS subframe occurs. The periodic interval corresponds to a plurality of subframes.

2. 发明申请

US20170104610A1 Method For Estimating a Channel, and Network Node 审中-公开
公开(公告)号：US20170104610A1
公开(公告)日：2017-04-13
申请号：US15128728
申请日：2014-03-26
申请人： Telefonaktiebolaget LM Ericsson (publ)
发明人： Miguel LOPEZ
IPC分类号： H04L25/02 , H04L5/00
CPC分类号： H04L25/0204 , H04L5/0007 , H04L25/0218 , H04W88/08 , H05K999/99
摘要： The disclosure relates to a method (60) performed in a network node (2) for estimating a channel. The network node (2) controls an antenna array (3) comprising a number N of antennas (51, . . . , 5N) in one or more spatial dimensions. The network node (2) comprises a receiver (72) receiving signals from the antenna array (3). The method (60) comprises: obtaining (61) matched filter channel estimates for each sub-carrier and antenna of a signal received by the antennas (51, . . . , 5N), the signal comprising a number K of frequency sub-carriers; arranging (62) the obtained matched filter channel estimates in a first multi-dimensional array, wherein time or frequency domain samples of the matched filter channel estimates are arranged along a first dimension and wherein a second dimension is a first spatial dimension of the number N of antennas, wherein the matched filter channel estimates are ordered in the first multi-dimensional array such as to reflect the physical location in space of the antennas (51, . . . , 5N); applying (63) an orthogonal transform to the first multi-dimensional array, providing a second multi-dimensional array; de-noising (64) the second multi-dimensional array, providing a third multi-dimensional array; applying (65) the inverse of the orthogonal transform to the third multi-dimensional array, providing channel estimates for all branches of the receiver (72). The disclosure also relates to corresponding network node, computer program and computer program products.

3. 发明授权

US09288094B2 Adaptive channel prediction and mitigating interference in OFDM systems 有权
标题翻译：自适应信道预测和减轻OFDM系统中的干扰
公开(公告)号：US09288094B2
公开(公告)日：2016-03-15
申请号：US14133123
申请日：2013-12-18
申请人： Intel Corporation
发明人： Bernard Arambepola , Parveen K. Shukla , Thushara Hewavithana
IPC分类号： H04L27/26 , H04L25/03
CPC分类号： H04L27/2646 , H04L5/0007 , H04L25/0218 , H04L25/022 , H04L25/0232 , H04L25/03343 , H04L27/2607 , H04L27/2613 , H04L27/2647 , H04L27/2665 , H04L27/2678
摘要： One embodiment provides an apparatus. The apparatus includes an optimization module configured to determine a guard interval remainder based, at least in part on a comparison of an allowable microreflection interference level and an actual microreflection interference level; and a windowing module configured to window an OFDM (orthogonal frequency division multiplexed) symbol utilizing the guard interval remainder. The apparatus may further include a channel estimator module configured to determine a predicted channel frequency response based, at least in part, on a probing symbol; and a pre-equalizer module configured to pre-equalize the OFDM symbol based, at least in part, on the predicted channel frequency response.
摘要翻译：一个实施例提供了一种装置。该装置包括：优化模块，其被配置为至少部分地基于允许的微反射干扰电平与实际微反射干扰电平的比较来确定保护间隔余数; 以及窗口模块，被配置为利用所述保护间隔余数来对OFDM（正交频分复用）符号进行窗口化。该装置还可以包括信道估计器模块，其被配置为至少部分地基于探测符号来确定预测的信道频率响应; 以及预均衡器模块，其被配置为至少部分地基于所预测的信道频率响应来预均衡所述OFDM符号。

4. 发明授权

US09148803B2 MIMO channel state information estimation with coupled iterative two-stage ranking 有权
标题翻译： MIMO信道状态信息估计与耦合迭代两阶段排序
公开(公告)号：US09148803B2
公开(公告)日：2015-09-29
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 , H04B7/02 , H04L25/02 , 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。

5. 发明授权

US08903021B2 Channel estimation for an OFDM communicaiton system with inactive subbands 有权
标题翻译：具有无源子带的OFDM通信系统的信道估计
公开(公告)号：US08903021B2
公开(公告)日：2014-12-02
申请号：US13784531
申请日：2013-03-04
申请人： QUALCOMM Incorporated
发明人： Ashok Mantravadi , Aamod Dinkar Khandekar , Edward Harrison Teague , Tamer A. Kadous
IPC分类号： H03K9/00 , H04L25/02
CPC分类号： H04L25/022 , H04L25/0218 , H04L25/0232
摘要： For channel estimation in a spectrally shaped wireless communication system, an initial frequency response estimate is obtained for a first set of P uniformly spaced subbands (1) based on pilot symbols received on a second set of subbands used for pilot transmission and (2) using extrapolation and/or interpolation, where P is a power of two. A channel impulse response estimate is obtained by performing a P-point IFFT on the initial frequency response estimate. A final frequency response estimate for N total subbands is derived by (1) setting low quality taps for the channel impulse response estimate to zero, (2) zero-padding the channel impulse response estimate to length N, and (3) performing an N-point FFT on the zero-padded channel impulse response estimate. The channel frequency/impulse response estimate may be filtered to obtain a higher quality channel estimate.
摘要翻译：对于频谱形状的无线通信系统中的信道估计，基于在用于导频传输的第二组子带上接收的导频符号，获得对于第一组P均匀间隔子带（1）的初始频率响应估计，以及（2）使用外插和/或插值，其中P是2的幂。通过对初始频率响应估计执行P点IFFT来获得信道脉冲响应估计。通过（1）将信道脉冲响应估计的低质量抽头设置为零，（2）将信道脉冲响应估计零填充到长度N，得到N个总子带的最终频率响应估计，以及（3）执行N 点零点填充信道脉冲响应估计。可以对信道频率/脉冲响应估计进行滤波以获得更高质量的信道估计。

6. 发明申请

US20130322283A1 MIMO CHANNEL STATE INFORMATION ESTIMATION WITH COUPLED ITERATIVE TWO-STAGE RANKING 有权
标题翻译： MIMO信道状态信息估计与耦合迭代两阶段排序
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。

7. 发明授权

US08509325B2 Adaptive thresholding for OFDM channel estimation 有权
标题翻译： OFDM信道估计的自适应阈值
公开(公告)号：US08509325B2
公开(公告)日：2013-08-13
申请号：US12250135
申请日：2008-10-13
申请人： Ashok Mantravadi , Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi , Rajeev Krishnamurthi
发明人： Ashok Mantravadi , Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi , Rajeev Krishnamurthi
IPC分类号： H04L27/28
CPC分类号： H04L25/0218 , H04L5/0007 , H04L25/0204 , H04L25/022 , H04L25/0224
摘要： An adaptive thresholding technique eliminates suboptimum threshold values by adjusting for varying channel conditions to eliminate interference where no channel energy is present, without discarding viable taps having useful channel energy. The adaptive thresholding technique adaptively optimizes receive threshold values for both wide and local area channels based only on measured C/I ratios 300. Thresholds are calculated based on instantaneous C/I estimates and/or weighted average C/I estimates calculated from WID/LID energies obtained from the current superframe WIC/LIC symbols respectively. In alternate embodiments, thresholds are calculated based on instantaneous C/I estimates and/or weighted average C/I estimates calculated from WTPC and LTPC symbols for the wide and local area channels, respectively The present adaptive thresholding technique dynamically reduces the threshold as the C/I estimate increases to mitigate performance degradation due to removal of weak signal taps. There is a separate threshold for each of the 12 coding and modulation modes supported by an exemplary receiver.
摘要翻译：自适应阈值技术通过调整不同的信道条件来消除次优阈值，以消除不存在信道能量的干扰，而不丢弃具有有用信道能量的可行分接头。自适应阈值技术仅基于测量的C / I比300自适应地优化宽和局域信道的接收阈值。阈值基于从WID / LID计算的瞬时C / I估计和/或加权平均C / I估计来计算从当前超帧WIC / LIC符号获得的能量。在替代实施例中，基于针对宽和局域信道的WTPC和LTPC符号计算的瞬时C / I估计和/或加权平均C / I估计来计算阈值。当前自适应阈值技术动态地将阈值设置为C /我估计增加以减轻由于去除弱信号抽头而导致的性能下降。对于由示例性接收机支持的12个编码和调制模式中的每一个，存在单独的阈值。

8. 发明申请

US20110274187A1 Method and a Channel Estimating Arrangement for Performing Channel Estimation 有权
标题翻译：用于执行信道估计的方法和信道估计布置
公开(公告)号：US20110274187A1
公开(公告)日：2011-11-10
申请号：US13084470
申请日：2011-04-11
申请人： Jinliang Huang , Krister Sundberg
发明人： Jinliang Huang , Krister Sundberg
IPC分类号： H04L27/00 , H04B15/00
CPC分类号： H04L25/022 , H04L25/0216 , H04L25/0218
摘要： The invention relates to a method in a receiving communication node for performing channel estimation on a signal received over a channel from a transmitting communication node. The receiving and transmitting communication nodes are comprised in a radio communications network. The receiving communication node receives the signal from the transmitting communication node, filters the signal by applying matched filter to the received signal in a matched filter process resulting in an estimated channel, transforms the estimated channel from a frequency domain to a discrete cosine transform domain in a discrete cosine transformation process, truncates the transformed estimated channel by applying a sloped window truncation function of an adaptive length onto the transformed estimated channel, wherein the adaptive length in the discrete cosine transform domain is calculated based on channel state information, and transforms the truncated transformed estimated channel from the discrete cosine transform domain to the frequency domain in an inverse discrete cosine transformation process resulting in a channel estimate of the channel estimation.
摘要翻译：本发明涉及一种接收通信节点中的方法，用于对从发射通信节点通过信道接收的信号进行信道估计。接收和发送通信节点包括在无线电通信网络中。接收通信节点从发送通信节点接收信号，通过在匹配滤波处理中对接收信号应用匹配滤波器对信号进行滤波，产生估计信道，将估计信道从频域变换为离散余弦变换域，离散余弦变换过程，通过将自适应长度的倾斜窗截断函数应用于经变换的估计信道来截断经变换的估计信道，其中基于信道状态信息计算离散余弦变换域中的自适应长度，并将截断的在离散余弦变换过程中从离散余弦变换域变换到频域的估计信道，导致信道估计的信道估计。

9. 发明申请

US20110103453A1 OFDMCHANNEL ESTIMATION SYSTEM AND METHOD COMPONENTS 审中-公开
标题翻译： OFDM信道估计系统和方法组件
公开(公告)号：US20110103453A1
公开(公告)日：2011-05-05
申请号：US13004326
申请日：2011-01-11
申请人： Haim Primo , Yosef Stein , Wei An
发明人： Haim Primo , Yosef Stein , Wei An
IPC分类号： H04L27/01 , H04L27/28
CPC分类号： H04L25/03038 , H04B17/345 , H04B17/364 , H04L25/0218 , H04L25/0228 , H04L25/025 , H04L25/03159 , H04L27/2647 , H04L2025/03414 , H04L2025/03783
摘要： Channel estimation for high mobility OFDM channels is achieved by identifying a set of channel path delays from an OFDM symbol stream including carrier data, inter-channel interference noise and channel noise; determining the average channel impulse response for the identified set of channel path delays in each symbol; generating a path delay curvature for each channel path delay in each symbol based on stored average channel impulse responses for the identified channel path delays; estimating the carrier data in the symbols in the OFDM symbol stream in the presence of inter-channel interference noise and channel noise from the OFDM symbol steam and the average impulse responses for the identified channel path delays; reconstructing the inter-channel interference noise in response to the path delay curvature, the identified set of channel path delays and estimated carrier data to produce a symbol stream of carrier data and channel noise with suppressed inter-channel interference noise.
摘要翻译：通过从包括载波数据，信道间干扰噪声和信道噪声的OFDM符号流识别一组信道路径延迟来实现高移动性OFDM信道的信道估计; 确定每个符号中所识别的信道路径延迟集合的平均信道脉冲响应; 基于所识别的信道路径延迟的所存储的平均信道脉冲响应，为每个符号中的每个信道路径延迟生成路径延迟曲率; 在存在来自OFDM符号蒸汽的信道间干扰噪声和信道噪声以及所识别的信道路径延迟的平均脉冲响应的情况下，估计OFDM符号流中的符号中的载波数据; 响应于路径延迟曲率重建信道间干扰噪声，识别出的信道路径延迟集合和估计的载波数据，以产生具有抑制的信道间干扰噪声的载波数据和信道噪声的符号流。

10. 发明授权

US07809073B2 Multiple input/multiple output communication method based on distributed transmission sources 失效
标题翻译：基于分布式传输源的多输入/多输出通信方法
公开(公告)号：US07809073B2
公开(公告)日：2010-10-05
申请号：US11578610
申请日：2004-04-14
申请人： Sheng Liu
发明人： Sheng Liu
IPC分类号： H04B7/02
CPC分类号： H04B1/707 , H04B1/7113 , H04B7/024 , H04B7/0421 , H04B7/0678 , H04L25/0208 , H04L25/0218 , H04L2025/03426
摘要： A MIMO method based on distributed transmission sources for transmitting a downlink data stream between M transmitting antennas and a mobile terminal having P receiving antennas, M and P>1, channels from at least two transmitting antennas to one of receiving antennas have different multipath distributions, comprises transmitting a different sub-data stream of M sub-data streams from the M transmitting antennas respectively to the mobile terminal by using the same spreading code: estimating multipath channel matrix of channels from the M transmitting antennas to the receiving antenna, which use the spreading code: and processing transmitted signals corresponding to the M sub-data streams received by the receiving antenna based on the multipath channel matrix of each receiving antenna, to restore the downlink data stream.
摘要翻译：基于用于在M个发送天线和具有P个接收天线M和P> 1的移动终端之间发送下行链路数据流的分布式发送源的MIMO方法，从至少两个发送天线到接收天线之一的信道具有不同的多径分布，包括通过使用相同的扩展码将来自M个发射天线的M个子数据流的不同子数据流分别发送到移动终端：估计从M个发射天线到接收天线的信道的多径信道矩阵，其使用扩展码，并根据每个接收天线的多路径信道矩阵处理与由接收天线接收的M个子数据流相对应的发送信号，以恢复下行链路数据流。

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