公开(公告)号：US08654910B1

公开(公告)日：2014-02-18

申请号：US13570750

申请日：2012-08-09

申请人： Jungwon Lee ,  Rohit U. Nabar ,  Hui-Ling Lou

发明人： Jungwon Lee ,  Rohit U. Nabar ,  Hui-Ling Lou

IPC分类号： H03D1/04

CPC分类号： H04L25/0206 ,  H04L25/0228 ,  H04L25/03331

摘要： Apparatus and methods are provided for computing soft information at a receiver having a plurality of receive antennas. The receiver may be a mobile station or a base station, and can receive a signal vector that includes an intended signal from a first source as well as interfering signals from one or more other, interfering sources. The receiver can determine modulation information, such as the modulation scheme, used by each of the interfering sources. The mobile station can also estimate channel information, such as channel gain information, associated with each interfering source. Using the modulation and channel information, the receiver can compute soft information, such as a log-likelihood ratio. In some embodiments, the receiver can adaptively determine which interference sources and which receive antennas to use when computing the soft information.

摘要翻译： 提供了用于在具有多个接收天线的接收机处计算软信息的装置和方法。 接收机可以是移动站或基站，并且可以接收包括来自第一源的预期信号以及来自一个或多个其它干扰源的干扰信号的信号向量。 接收机可以确定由每个干扰源使用的调制方式，例如调制方案。 移动站还可以估计与每个干扰源相关联的信道信息，例如信道增益信息。 使用调制和信道信息，接收机可以计算软信息，例如对数似然比。 在一些实施例中，当计算软信息时，接收机可以自适应地确定哪些干扰源和哪些接收天线使用。

公开(公告)号：US08644262B1

公开(公告)日：2014-02-04

申请号：US13112009

申请日：2011-05-20

申请人： Yakun Sun ,  Adina Matache ,  Jungwon Lee

发明人： Yakun Sun ,  Adina Matache ,  Jungwon Lee

IPC分类号： H04W4/00

CPC分类号： H04B7/0456 ,  H04B7/0413 ,  H04B7/0632 ,  H04B7/066 ,  H04B7/0671 ,  H04B7/0673 ,  H04B7/0678 ,  H04B7/068 ,  H04B7/0691 ,  H04B17/336 ,  H04L1/0026 ,  H04L1/0029 ,  H04L1/0036 ,  H04L1/06 ,  H04L5/0023

摘要： Systems and methods are provided for determining a channel quality indicator (CQI) in a transmission system associated with a diversity transmission scheme. A plurality of independent diversity branches are identified in the diversity transmission scheme. Each one of the independent diversity branches may correspond to a different portion of the effective channel and may include any suitable combination of frequency, time, and/or spatial components of the effective channel or of any wired or wireless paths or combinations of the same. An effective Signal-to-Noise Ratio (SNR) value is computed for each one of the identified independent diversity branches. The computed effective SNR values are combined for the identified independent diversity branches to generate a CQI value.

摘要翻译： 提供了用于确定与分集传输方案相关联的传输系统中的信道质量指示符（CQI）的系统和方法。 在分集传输方案中识别出多个独立分集分支。 独立分集分支中的每一个可以对应于有效信道的不同部分，并且可以包括有效信道或任何有线或无线路径或其组合的频率，时间和/或空间分量的任何合适的组合。 为所识别的独立分集分支中的每一个计算有效的信噪比（SNR）值。 为所识别的独立分集分支组合计算出的有效SNR值以产生CQI值。

公开(公告)号：US08630379B1

公开(公告)日：2014-01-14

申请号：US13164111

申请日：2011-06-20

申请人： Yakun Sun ,  Jungwon Lee

发明人： Yakun Sun ,  Jungwon Lee

IPC分类号： H03D1/04

CPC分类号： H04B7/0456 ,  H04B1/10 ,  H04B7/0413 ,  H04J11/004 ,  H04L1/0048 ,  H04L25/03305

摘要： Systems and methods are provided for determining a successive interference cancellation (SIC) decoding ordering in a multiple input multiple output transmission (MIMO) system. Multiple decoding orderings for received codewords are identified. A performance objective, such as total throughput or total probability of decoding, is computed for each one of the orderings based on the position of the codewords in the ordering. A globally optimal ordering is found that maximizes the performance objective over the multiple decoding orderings.

摘要翻译： 提供了用于确定多输入多输出传输（MIMO）系统中的连续干扰消除（SIC）解码排序的系统和方法。 识别接收码字的多个解码顺序。 基于排序中的码字的位置，针对每个排序计算性能目标，例如总吞吐量或总解码概率。 发现全局最优排序，使多个解码顺序的性能目标最大化。

公开(公告)号：US08630371B1

公开(公告)日：2014-01-14

申请号：US13475191

申请日：2012-05-18

申请人： Jungwon Lee ,  Raj M. Misra ,  Adina Matache ,  Konstantinos Sarrigeorgidis

发明人： Jungwon Lee ,  Raj M. Misra ,  Adina Matache ,  Konstantinos Sarrigeorgidis

IPC分类号： H03K9/00

CPC分类号： H04L25/024 ,  H04L25/022 ,  H04L25/0228 ,  H04L27/2601 ,  H04L27/2657 ,  H04L2027/003 ,  H04L2027/0067 ,  H04L2027/0093

摘要： Systems and methods are provided for channel estimation using linear phase estimation. These systems and methods enable improved channel estimation by estimating a linear channel phase between received pilot subcarrier signals. The estimated linear phase can then be removed from the received pilot subcarrier signals. After the estimated linear phase is removed from the received pilot subcarrier signals, a channel response can be estimated. A final estimated channel response can be generated by multiplying the results of the linear channel estimation by the estimated linear phase.

摘要翻译： 提供了使用线性相位估计的信道估计的系统和方法。 这些系统和方法通过估计接收的导频副载波信号之间的线性信道相位来实现改进的信道估计。 然后可以从接收到的导频子载波信号中去除估计的线性相位。 在从接收到的导频子载波信号中去除估计的线性相位之后，可以估计信道响应。 可以通过将线性信道估计的结果乘以估计的线性相位来生成最终估计的信道响应。

公开(公告)号：US20130336430A1

公开(公告)日：2013-12-19

申请号：US13523824

申请日：2012-06-14

申请人： Chun Kin Au Yeung ,  Hanju Kim ,  Jungwon Lee ,  Inyup Kang

发明人： Chun Kin Au Yeung ,  Hanju Kim ,  Jungwon Lee ,  Inyup Kang

IPC分类号： H04L27/00 ,  H03M13/09

CPC分类号： H04L25/03171 ,  H03M13/09 ,  H03M13/2957 ,  H03M13/2966 ,  H03M13/3723 ,  H03M13/3746 ,  H03M13/3753 ,  H03M13/6306 ,  H03M13/6331 ,  H03M13/6525 ,  H03M13/658 ,  H04L1/005 ,  H04L1/1829 ,  H04L25/03891

摘要： A method of operation of a communication system includes: retaining an a-posteriori detector-data, a detector-extrinsic-information, an a-posteriori-decoder-data, a decoder-extrinsic-value, or a combination thereof calculated from a received signal; determining an a-priori-decoder-information or an a-priori detector-information from the a-posteriori detector-data, the detector-extrinsic-information, the a-posteriori-decoder-data, the decoder-extrinsic-value, or a combination thereof; and adjusting the a-posteriori detector-data, the detector-extrinsic-information, the a-posteriori-decoder-data, the decoder-extrinsic-value, or a combination thereof using the a-priori-decoder-information or the a-priori detector-information for communicating through a device.

摘要翻译： 一种通信系统的操作方法包括：从接收到的数据，保存一个后验检测器数据，一个检测器 - 外在信息，一个后验解码器数据，一个解码器 - 非本征值或其组合 信号; 从后验检测器数据，检测器外在信息，后验解码器数据，解码器外在值或者解码器外在信号中确定先验解码器信息或先验检测器信息 其组合; 以及使用先验解码器信息或者a-before-解码器信息调整后验检测器数据，检测器外在信息，后验解码器数据，解码器外在值或其组合， 用于通过设备进行通信的先验检测器信息。

公开(公告)号：US08611480B1

公开(公告)日：2013-12-17

申请号：US12055256

申请日：2008-03-25

申请人： Jungwon Lee ,  Rohit U. Nabar ,  Hui-Ling Lou

发明人： Jungwon Lee ,  Rohit U. Nabar ,  Hui-Ling Lou

IPC分类号： H04B7/10 ,  H04L1/02

CPC分类号： H04B7/08 ,  H04B1/10 ,  H04B7/0669 ,  H04B7/0845 ,  H04L1/0631 ,  H04L1/0668

摘要： Systems and methods are provided for decoding a signal vector in a transmit diversity scheme for varying channels. Information obtained in more than one symbol period are treated as a single received vector, and each of the received signal vectors may be processed to reduce the effects of varying channel characteristics. The received signal vectors may be combined by addition and decoded using a maximum-likelihood decoder. In some embodiments, the received signal vectors are processed separately and then combined. In other embodiments, the received signal vectors are combined and then processed. In some embodiments, zero-forced linear equalization techniques are used to processed the received signals. In some embodiments the signal vectors and varying channel response matrices are broken down to equivalent forms in order to simplify the processing.

公开(公告)号：US08565360B1

公开(公告)日：2013-10-22

申请号：US13399553

申请日：2012-02-17

申请人： Yakun Sun ,  Jungwon Lee

发明人： Yakun Sun ,  Jungwon Lee

IPC分类号： H04L1/02

CPC分类号： H04B7/0456 ,  H04L1/20 ,  H04L5/0023 ,  H04L25/03343 ,  H04L2025/03426 ,  H04L2025/03808

摘要： Systems are provided for searching for a codeword from a plurality of codewords in a codebook for use in precoding, for example, as used in a multiple-input multiple-output (MIMO) transmission system. Dimension reduction techniques may be utilized to reduce the complexity and enhance the efficiency of the codebooks search. Null-spaces of an optimal codeword and codewords in a codebook may be computed. Distance values may be computed based on the null=spaces of the codewords. A codeword may be selected from the codebook based on a minimum distance value from the optimal codeword.

公开(公告)号：US08559543B1

公开(公告)日：2013-10-15

申请号：US12891377

申请日：2010-09-27

申请人： Jungwon Lee ,  Jiwoong Choi

发明人： Jungwon Lee ,  Jiwoong Choi

IPC分类号： H04L1/02

CPC分类号： H04B7/0413 ,  H04L25/03242

摘要： Methods and apparatus are provided for soft-decision maximum likelihood demodulation to decode a data vector transmitted in a multiple-input multiple-output (MIMO) communications channel. Soft-decision demodulators are disclosed that implement sphere decoding to reduce complexity of demodulation while preserving optimal performance. Candidate signal values associated with the transmitted data vector may be obtained and partitioned into signal bit groups. A sphere search may be performed over the candidate signal values within a search radius value to determine a smallest distance metric for each signal bit group. The search radius value may be updated based on a current smallest distance metric for each signal bit group. A log-likelihood ratio (LLR) may be computed from the determined smallest distance metrics for each signal bit group using a soft-decision demodulator.

公开(公告)号：US20130156139A1

公开(公告)日：2013-06-20

申请号：US13560330

申请日：2012-07-27

申请人： Jungwon Lee ,  Hyukjoon Kwon ,  Inyup Kang

发明人： Jungwon Lee ,  Hyukjoon Kwon ,  Inyup Kang

IPC分类号： H04B1/10

CPC分类号： H04W28/18 ,  H04L1/0048 ,  H04L1/005 ,  H04L1/0054

摘要： A method of operation of a wireless communication system includes: receiving a desired input signal and an interference input signal; activating a first symbol detector for generating a desired log-likelihood ratio from the desired input signal; activating a second symbol detector for generating an interference log-likelihood ratio from the interference input signal; and jointly decoding a decoded bit by iteratively refining the interference log-likelihood ratio for negating the interference input signal and iteratively refining the desired log-likelihood ratio for enhancing the desired input signal.

摘要翻译： 无线通信系统的操作方法包括：接收期望的输入信号和干扰输入信号; 激活第一符号检测器，用于从期望的输入信号产生所需的对数似然比; 激活第二符号检测器，用于从所述干扰输入信号产生干扰对数似然比; 并且通过迭代地改善干扰对数似然比来否定干扰输入信号并迭代地提炼期望的对数似然比以增强期望的输入信号来联合解码解码比特。

公开(公告)号：US08437434B1

公开(公告)日：2013-05-07

申请号：US13567960

申请日：2012-08-06

申请人： Jungwon Lee ,  Jiwoong Choi ,  Hui-Ling Lou

发明人： Jungwon Lee ,  Jiwoong Choi ,  Hui-Ling Lou

IPC分类号： H03D1/00 ,  H04L27/06

CPC分类号： H04L25/03203 ,  H04L25/03331

摘要： A plurality of received data symbols is received, and a first received data symbol is selected from the plurality of received data symbols. A plurality of global optimum candidate values of a first estimated transmitted data symbol corresponding to the first received data symbol is determined for different given candidate values of second estimated transmitted data symbols corresponding to second received data symbols. Likelihood values for bits corresponding to the second estimated transmitted data symbols are calculated using the plurality of global optimum candidate values. All possible values of the first estimated transmitted data symbol are grouped into two or more bit groups, and a plurality of local optimum candidate values are determined for different bit groups. Likelihood values for bits corresponding to the first estimated transmitted data symbol are calculated using the plurality of global optimum candidate values and the plurality of local optimum candidate values.

摘要翻译： 接收多个接收到的数据符号，并且从多个接收的数据符号中选择第一接收数据符号。 针对对应于第二接收数据符号的第二估计发送数据符号的不同给定候选值确定与第一接收数据符号对应的第一估计发送数据符号的多个全局最优候选值。 使用多个全局最优候选值来计算与第二估计发送数据符号对应的位的似然值。 第一估计发送数据符号的所有可能值被分组为两个或多个位组，并且针对不同位组确定多个局部最优候选值。 使用多个全局最优候选值和多个局部最优候选值来计算与第一估计发送数据符号对应的位的似然值。