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1. 发明申请

US20190165985A1 Method And System For Compressed Sensing Joint Channel Estimation In A Cellular Communications Network 审中-公开
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.

2. 发明申请

US20180302213A1 METHODS, SYSTEMS, AND COMPUTER PROGRAM PRODUCTS FOR COMMUNICATION CHANNEL PREDICTION FROM RECEIVED MULTIPATH COMMUNICATIONS IN A WIRELESS COMMUNICATIONS SYSTEM 审中-公开
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.

3. 发明授权

US09923739B2 Wireless receiver for multiuser detection incorporating residual estimation errors 有权
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.

4. 发明授权

US09735987B2 Methods, systems, and computer program products for determining a demodulation reference sequence for an intercell interfering signal received from a mobile device in a long term evolution communication system 有权
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.

5. 发明申请

US20160191126A1 Method And System For Compressed Sensing Joint Channel Estimation In An LTE Cellular Communications Network 有权
标题翻译： LTE蜂窝通信网络中压缩感知联合信道估计的方法与系统
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。

6. 发明申请

US20150180611A1 Methods And Apparatus For Extracting Symbols From An SC-FDMA Digital Communications Signal Using A Maximum Likelihood Detector 有权
标题翻译：使用最大似然检测器从SC-FDMA数字通信信号中提取符号的方法和装置
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。

7. 发明授权

US10396937B2 Wireless receiver for turbo loop multiuser detection incorporating reuse of QR component 有权
公开(公告)号：US10396937B2
公开(公告)日：2019-08-27
申请号：US16226309
申请日：2018-12-19
申请人： Collision Communications, Inc.
发明人： Brandon Hombs , Sayak Bose
IPC分类号： H04L1/00 , H04L25/03
摘要： An improved receiver design implements a method for modeling users in SIC turbo loop multiuser detection architectures that reduces the number of implementation cycles, and thereby reduces the computational overhead associated with computing the inverse of the received signal covariance matrix, by efficiently reusing components of a QR decomposition. By reusing some of the computational results from the previous turbo loop's equalizer calculation, the disclosed receiver significantly reduces the computational burden of updating the linear equalizer on each turbo loop. Depending on the embodiment, this reduction can be accomplished in at least two different ways, depending on the dimensionality and other aspects of the implementation.

8. 发明授权

US10333761B2 Method and system for compressed sensing joint channel estimation in a cellular communications network 有权
公开(公告)号：US10333761B2
公开(公告)日：2019-06-25
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 , H04B7/024 , H04B7/0452
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.

9. 发明申请

US20180102869A1 Wireless Receiver For Turbo Loop Multiuser Detection Incorporating Reuse Of QR Component 审中-公开
公开(公告)号：US20180102869A1
公开(公告)日：2018-04-12
申请号：US15838258
申请日：2017-12-11
申请人： Collision Communications, Inc.
发明人： Brandon Hombs , Sayak Bose
IPC分类号： H04L1/00 , H04L25/03
CPC分类号： H04L1/005 , H04L25/03968 , H04L2025/03356 , H04L2025/03611
摘要： An improved receiver design implements a method for modeling users in SIC turbo loop multiuser detection architectures that reduces the number of implementation cycles, and thereby reduces the computational overhead associated with computing the inverse of the received signal covariance matrix, by efficiently reusing components of a QR decomposition. By reusing some of the computational results from the previous turbo loop's equalizer calculation, the disclosed receiver significantly reduces the computational burden of updating the linear equalizer on each turbo loop. Depending on the embodiment, this reduction can be accomplished in at least two different ways, depending on the dimensionality and other aspects of the implementation.

10. 发明授权

US09755714B2 Method and system for compressed sensing joint channel estimation in an LTE cellular communications network 有权
公开(公告)号：US09755714B2
公开(公告)日：2017-09-05
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： H04K1/10 , H04L27/28 , H04B7/0452 , H04B7/024 , H04L25/02
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.

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