公开(公告)号：US20190165985A1

公开(公告)日：2019-05-30

申请号：US16244064

申请日：2019-01-09

申请人： Collision Communications, Inc.

发明人： Sayak Bose ,  Brandon Hombs ,  Sagar Dhakal ,  Joseph Farkas

IPC分类号： H04L27/26 ,  H04L25/02 ,  H04B7/0452 ,  H04B7/024

CPC分类号： H04L27/2671 ,  H04B7/024 ,  H04B7/0452 ,  H04L25/0202 ,  H04L25/0204 ,  H04L25/0222 ,  H04L25/0224

摘要： Methods and systems for performing compressed time domain joint channel estimation in a multi-user MIMO wireless network include receiving training signals from a plurality of users, estimating a maximum delay spread for the received data according to a coherence bandwidth of the received data, limiting the received data in the time domain to the estimated maximum delay spread, selecting and estimating an active tap from the limited data set, and subtracting a contribution of the selected active tap from the reduced data set. These steps can be repeated until the residual signal falls below a specified minimum. The network can be a C-RAN network. The training data can be SRS or DMRS data. Limiting the received data ensures that only a few significant taps are analyzed, so that the system is not under determined and can be analyzed for accurate channel estimation using any of several existing algorithms.

公开(公告)号：US20180302213A1

公开(公告)日：2018-10-18

申请号：US15489579

申请日：2017-04-17

申请人： Collision Communications, Inc.

发明人： Sayak Bose ,  Brandon Hombs

IPC分类号： H04L7/033 ,  H04L25/02 ,  H04L7/00 ,  H04B7/06

摘要： Methods and systems are described for communication channel prediction from received multipath communications in a wireless communications system. In one aspect, a baseband impairment compensation of at least one of sample frequency offset, carrier frequency offset, and time offset between a wireless transmitter and a wireless receiver is estimated. A plurality of complex value channel tap estimates is received for each of a plurality of channel taps. A plurality of complex value channel tap predictions is determined for a future multipath communication based on the prior received corresponding complex value channel tap estimates and the baseband impairment compensation.

公开(公告)号：US09923739B2

公开(公告)日：2018-03-20

申请号：US15375970

申请日：2016-12-12

申请人： Collision Communications, Inc.

发明人： Sayak Bose ,  Brandon Hombs ,  Joseph Farkas

IPC分类号： H04L25/03 ,  H04B7/0452

CPC分类号： H04L25/03292 ,  H04B7/0452 ,  H04L25/0204 ,  H04L25/03076 ,  H04L25/03267 ,  H04L25/03331 ,  H04L2025/03636

摘要： An improved receiver design implements a practical method for modeling users in SIC turbo loop multiuser detection architectures, wherein in each loop unsubtracted estimation errors from previous loops are used to appropriately scale the error covariance matrix for each user, thereby accurately representing the remaining residual interference in the data stream for each desired user. The effect of estimation errors in previous interference cancellation operations is thereby minimized, and symbol estimations in successive turbo loops are improved, for example during multiuser MMSE, multiuser MMSE with interference rejection combining (MMSE-IRC), sample matrix inversion (SMI), or any of their adaptive variants (least mean-square, recursive least square, Kalman filter etc.). The estimated residual symbol energy can be computed per symbol, and then applied to entire data streams, to groups of symbols, or to each symbol separately.

公开(公告)号：US09860913B2

公开(公告)日：2018-01-02

申请号：US15383566

申请日：2016-12-19

申请人： Collision Communications, Inc.

发明人： Joseph Farkas ,  Seyedmehdi S. Nokhodberiz ,  Brandon Hombs

IPC分类号： H04W72/12 ,  H04W24/08

CPC分类号： H04W72/1294 ,  H04W24/08 ,  H04W72/1257 ,  H04W72/1278

摘要： Methods and systems for determining scheduling information of a base station in a network operating according to the Long Term Evolution (“LTE”) standard include monitoring transmissions on the PDCCH of the wireless base station, maintaining a list of active Radio Network Temporary Identifiers (“RNTI's”) assigned by the wireless base station to user equipment, extracting PDCCH detections from the monitored transmissions, applying at least one false alarm reduction strategy to eliminate invalid PDCCH detections from the extracted PDCCH detections, said false alarm reduction strategy including determining an RNTI that is valid for an extracted PDCCH detection and determining if the valid RNTI is included in the list of active RNTI's. Scheduling information of the wireless base station is determined from the extracted PDCCH detection.

公开(公告)号：US09735987B2

公开(公告)日：2017-08-15

申请号：US14261772

申请日：2014-04-25

申请人： Collision Communications, Inc.

发明人： Joseph Farkas ,  Sayak Bose ,  Brandon Hombs

IPC分类号： H04L25/02 ,  H04W72/08 ,  H04L5/00 ,  H04J11/00

CPC分类号： H04L25/0228 ,  H04J11/005 ,  H04L5/00 ,  H04L25/0226

摘要： Methods and systems are described for determining a Demodulation Reference Sequence (DMRS) for an intercell interfering signal received from a mobile device in a Long Term Evolution (LTE) communication system. In one aspect, an interfering signal transmitted from a mobile device being served by a second cell of an LTE communication system is received at a receiver serving a first cell in the LTE communication system. At least one transmit parameter is detected from the received interfering signal. A DMRS for the received interfering signal is determined based on the detected transmit parameter.

公开(公告)号：US20170099677A1

公开(公告)日：2017-04-06

申请号：US15383566

申请日：2016-12-19

申请人： Collision Communications, Inc.

发明人： Joseph Farkas ,  Seyedmehdi S. Nokhodberiz ,  Brandon Hombs

IPC分类号： H04W72/12

CPC分类号： H04W72/1294 ,  H04W24/08 ,  H04W72/1257 ,  H04W72/1278

摘要： Methods and systems for determining scheduling information of a base station in a network operating according to the Long Term Evolution (“LTE”) standard include monitoring transmissions on the PDCCH of the wireless base station, maintaining a list of active Radio Network Temporary Identifiers (“RNTI's”) assigned by the wireless base station to user equipment, extracting PDCCH detections from the monitored transmissions, applying at least one false alarm reduction strategy to eliminate invalid PDCCH detections from the extracted PDCCH detections, said false alarm reduction strategy including determining an RNTI that is valid for an extracted PDCCH detection and determining if the valid RNTI is included in the list of active RNTI's. Scheduling information of the wireless base station is determined from the extracted PDCCH detection.

公开(公告)号：US09544915B2

公开(公告)日：2017-01-10

申请号：US14465357

申请日：2014-08-21

申请人： Collision Communications, Inc.

发明人： Joseph Farkas ,  Seyedmehdi S. Nokhodberiz ,  Brandon Hombs

IPC分类号： H04W72/12 ,  H04W24/08

CPC分类号： H04W72/1294 ,  H04W24/08 ,  H04W72/1257 ,  H04W72/1278

摘要： Methods and systems for determining scheduling information of a base station in a network operating according to the Long Term Evolution (“LTE”) standard include monitoring transmissions on the PDCCH of the wireless base station, maintaining a list of active Radio Network Temporary Identifiers (“RNTI's”) assigned by the wireless base station to user equipment, extracting PDCCH detections from the monitored transmissions, applying at least one false alarm reduction strategy to eliminate invalid PDCCH detections from the extracted PDCCH detections, said false alarm reduction strategy including determining an RNTI that is valid for an extracted PDCCH detection and determining if the valid RNTI is included in the list of active RNTI's. Scheduling information of the wireless base station is determined from the extracted PDCCH detection.

摘要翻译： 用于确定根据长期演进（“LTE”）操作的网络中的基站的调度信息的方法和系统包括监视无线基站的PDCCH上的传输，维护活动的无线电网络临时标识符（“ RNTI的“），从所监视的传输中提取PDCCH检测，应用至少一个误报警减少策略，以从所提取的PDCCH检测中消除无效的PDCCH检测，所述虚假警报减少策略包括确定RNTI， 对于提取的PDCCH检测有效，并且确定有效RNTI是否包括在活动RNTI的列表中。 从提取的PDCCH检测确定无线基站的调度信息。

公开(公告)号：US20160337049A1

公开(公告)日：2016-11-17

申请号：US14708595

申请日：2015-05-11

申请人： Collision Communications, Inc.

发明人： Sagar Dhakal ,  Brandon Hombs

IPC分类号： H04B15/02 ,  H04B17/11 ,  H04B17/21 ,  H04B7/06

CPC分类号： H04B15/02 ,  H04B7/0626 ,  H04B17/11 ,  H04B17/21

摘要： Methods and systems are described for calibrating hardware-induced distortion in a communication system. In one aspect, a calibration signal is transmitted from a base station (BS) to a user equipment (UE). A corresponding amplified version of the transmitted calibration signal is received by the BS from the UE. A composite downlink-uplink channel state information (CSI) is estimated based on the received corresponding amplified version of the transmitted calibration signal. Uplink CSI is estimated based on a reference signal received from the UE. At least one of a phase hardware-induced distortion and an amplitude hardware induced distortion is determined based on the estimated composite downlink-uplink CSI and the estimated uplink CSI.

摘要翻译： 描述了用于校准通信系统中硬件引起的失真的方法和系统。 在一个方面，校准信号从基站（BS）发送到用户设备（UE）。 传输的校准信号的相应放大版本由BS从UE接收。 基于所发送的校准信号的所接收的相应的放大版本来估计复合的下行链路 - 上行链路信道状态信息（CSI）。 基于从UE接收的参考信号来估计上行链路CSI。 基于估计的复合下行链路 - 上行链路CSI和估计的上行链路CSI，确定相位硬件引起的失真和幅度硬件诱发失真中的至少一个。

公开(公告)号：US20160191126A1

公开(公告)日：2016-06-30

申请号：US14583076

申请日：2014-12-24

申请人： Collision Communications, Inc.

发明人： Sayak Bose ,  Brandon Hombs ,  Sagar Dhakal ,  Joseph Farkas

IPC分类号： H04B7/04

CPC分类号： H04L27/2671 ,  H04B7/024 ,  H04B7/0452 ,  H04L25/0202 ,  H04L25/0204 ,  H04L25/0222 ,  H04L25/0224

摘要： Methods and systems for performing compressed time domain joint channel estimation in a multi-user MIMO LTE wireless network include receiving training signals from a plurality of users, estimating a maximum delay spread for the received data according to a coherence bandwidth of the received data, limiting the received data in the time domain to the estimated maximum delay spread, selecting and estimating an active tap from the limited data set, and subtracting a contribution of the selected active tap from the reduced data set. These steps can be repeated until the residual signal falls below a specified minimum. The network can be a C-RAN network. The training data can be SRS or DMRS data. Limiting the received data ensures that only a few significant taps are analyzed, so that the system is not under determined and can be analyzed for accurate channel estimation using any of several existing algorithms.

摘要翻译： 用于在多用户MIMO LTE无线网络中执行压缩时域联合信道估计的方法和系统包括从多个用户接收训练信号，根据接收到的数据的相干带宽估计所接收数据的最大延迟扩展，限制 在时域中接收到的数据到估计的最大延迟扩展，从受限数据集中选择和估计有效抽头，以及从所减少的数据集中减去所选择的有效抽头的贡献。 可以重复这些步骤，直到残留信号低于规定的最小值。 网络可以是C-RAN网络。 训练数据可以是SRS或DMRS数据。 限制接收到的数据确保仅分析几个重要的水龙头，以便系统不被确定，并且可以使用几种现有算法中的任一种进行精确的信道估计分析。

公开(公告)号：US20150180611A1

公开(公告)日：2015-06-25

申请号：US14138210

申请日：2013-12-23

申请人： Collision Communications, Inc.

发明人： Joseph Farkas ,  Brandon Hombs ,  Sayak Bose

IPC分类号： H04L1/00 ,  H04B7/04 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26

CPC分类号： H04L1/0054 ,  H04B7/0413 ,  H04L1/0052 ,  H04L25/024 ,  H04L25/03159 ,  H04L25/03203 ,  H04L25/03305 ,  H04L27/2636 ,  H04L27/2647 ,  H04L2025/03414 ,  H04L2025/03598

摘要： A method and system are described for applying MLD detection to SC-FDMA data streams. Embodiments obtain initial estimates of at least some symbols encoded within an SC-FDMA data input using a non-MLD algorithm, and then use the initial estimates to reduce the search space and the MLD complexity. In addition, the reduced complexity MLD (“RC-MLD”) is applied only to a limited search window within the digital communication input, thereby modeling only a subset of the symbols included in the digital communication input. The MLD complexity is thereby reduced sufficiently for an RC-MLD decoder to simultaneously model and extract a plurality of the symbols included in the data input. Symbols initially decoded by the non-MLD algorithm can be subtracted from the data input in a serial interference cancelling module. This cancellation can be applied successively in a turbo-loop.

摘要翻译： 描述了将MLD检测应用于SC-FDMA数据流的方法和系统。 实施例获得使用非MLD算法在SC-FDMA数据输入内编码的至少一些符号的初始估计，然后使用初始估计来减少搜索空间和MLD复杂度。 此外，降低的复杂度MLD（“RC-MLD”）仅应用于数字通信输入内的有限搜索窗口，从而仅对包含在数字通信输入中的符号的子集进行建模。 因此，对于RC-MLD解码器，MLD复杂度被充分降低以同时建模和提取包括在数据输入中的多个符号。 可以从串行干扰消除模块中的数据输入中减去最初由非MLD算法解码的符号。 这种消除可以在涡轮循环中连续应用。