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51. 发明授权

US08238488B1 Multi-stream maximum-likelihood demodulation based on bitwise constellation partitioning 有权
标题翻译：基于逐位星座分割的多流最大似然解调
公开(公告)号：US08238488B1
公开(公告)日：2012-08-07
申请号：US12547285
申请日：2009-08-25
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 method of decoding a signal includes receiving multiple data symbols corresponding to multiple transmitted data symbols. The method further includes selecting one candidate data symbol from multiple candidate data symbols corresponding to the multiple transmitted data symbols. The method further includes determining a global optimum candidate value for the selected one candidate data symbol. The method further includes grouping all possible values of the selected one candidate data symbol into two or more bit groups. The method further includes selecting a bit group from the two or more bit groups that does not include the global optimum value. The method further includes determining a local optimum candidate value from values in the selected bit group. The method further includes calculating a likelihood value for a bit in the selected one candidate data symbol based at least in part on the determined global and local optimum candidate values.
摘要翻译：解码信号的方法包括接收与多个发送的数据符号对应的多个数据符号。该方法还包括从对应于多个发送的数据符号的多个候选数据符号中选择一个候选数据符号。该方法还包括确定所选择的一个候选数据符号的全局最佳候选值。该方法还包括将所选择的一个候选数据符号的所有可能值分组为两个或更多位组。该方法还包括从不包括全局最优值的两个或多个比特组中选择一个比特组。该方法还包括从所选位组中的值确定局部最佳候选值。该方法还包括至少部分地基于所确定的全局和局部最佳候选值来计算所选择的一个候选数据符号中的比特的似然值。

52. 发明授权

US08175197B2 Preamble detection with unknown channel 有权
标题翻译：前导码检测与未知信道
公开(公告)号：US08175197B2
公开(公告)日：2012-05-08
申请号：US11717405
申请日：2007-03-13
申请人： Jungwon Lee , Hui-Ling Lou
发明人： Jungwon Lee , Hui-Ling Lou
IPC分类号： H03D1/00
CPC分类号： H04L27/2656 , H04L5/023 , H04L27/2657 , H04L27/2662 , H04L27/2675
摘要： A system includes a correlation module and a control module. The correlation module is configured to generate correlation values based on a correlation of modulated signals with a plurality of preamble sequences and generate correlation values. The modulated signals include sub-carriers modulated using orthogonal frequency domain multiplexing (OFDM). The control module is configured to select a largest correlation value from the correlation values and detect one of the preamble sequences in the modulated signals upon determining that a magnitude of the largest correlation value is greater than or equal to a first predetermined threshold. The control module divides N of the sub-carriers into L bands in response to a channel gain of the sub-carriers not being substantially the same for all of the sub-carriers, where N and L are integers greater than 1, and where each of the L bands includes N/L of the sub-carriers.
摘要翻译：系统包括相关模块和控制模块。相关模块被配置为基于调制信号与多个前同步码序列的相关性生成相关值，并且生成相关值。调制信号包括使用正交频域复用（OFDM）调制的子载波。控制模块被配置为从相关值中选择最大相关值，并且在确定最大相关值的大小大于或等于第一预定阈值时，检测调制信号中的前导序列之一。响应于子载波的信道增益对于所有子载波基本不相同，其中N和L是大于1的整数，控制模块将N个子载波分成L个波段，并且其中每个的L个波段包括N / L个子载波。

53. 发明授权

US08135098B2 BICM decoding in the presence of co-channel interference 有权
标题翻译：在存在同频道干扰的情况下进行BICM解码
公开(公告)号：US08135098B2
公开(公告)日：2012-03-13
申请号：US12119264
申请日：2008-05-12
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： H04B1/10
CPC分类号： H04B1/1027 , H04L25/067
摘要： Systems and methods are provided for computing soft information for digital information based on a received signal, where the received signal suffers from noise and interference. A receiver that decodes the received signal may estimate channel information, such as the channel gain, associated with the interfering source. The receiver may also obtain modulation information through a backbone network or by decoding control information transmitted by the interfering source. Using the modulation information and the channel information, the receiver may estimate the effect that interference has on the received signal, and may compute soft information (e.g., a log-likelihood ratio) for the digital information.
摘要翻译：提供了系统和方法，用于基于接收到的信号来计算用于数字信息的软信息，其中所接收的信号受到噪声和干扰的影响。对接收到的信号进行解码的接收机可以估计与干扰源相关联的信道信息，例如信道增益。接收机还可以通过骨干网获得调制信息，或通过解码由干扰源发送的控制信息。使用调制信息和信道信息，接收机可以估计干扰对接收信号的影响，并且可以计算数字信息的软信息（例如，对数似然比）。

54. 发明授权

US08099050B1 Digital radio data system receiver methods and apparatus 有权
标题翻译：数字无线电数据系统接收机的方法和装置
公开(公告)号：US08099050B1
公开(公告)日：2012-01-17
申请号：US12544567
申请日：2009-08-20
申请人： Jungwon Lee , Dimitrios-Alexandros Toumpakaris , Hui-Ling Lou , Chris Cheng-Chieh Lee
发明人： Jungwon Lee , Dimitrios-Alexandros Toumpakaris , Hui-Ling Lou , Chris Cheng-Chieh Lee
IPC分类号： H04B1/16
CPC分类号： H04L27/2334 , H04B1/1653 , H04H20/34 , H04H40/18 , H04H2201/13
摘要： Methods and apparatus are provided for receiving a first signal and generating an output signal indicative of radio data system (“RDS”) information. A receiver circuit of the invention can include mixer circuitry, lowpass filter circuitry, downsampler circuitry, and decoder circuitry. Advantageously, the receiver circuit can operate entirely within the digital domain, promoting interoperability with digital frequency modulation (“FM”) demodulator circuitry.
摘要翻译：提供了用于接收第一信号并产生指示无线电数据系统（“RDS”）信息的输出信号的方法和装置。本发明的接收机电路可以包括混频器电路，低通滤波器电路，下采样器电路和解码器电路。有利地，接收器电路可以完全在数字域内操作，促进与数字频率调制（“FM”）解调器电路的互操作性。

55. 发明授权

US08077785B1 Generalized co-phasing for multiple transmitting and receiving antennas 有权
标题翻译：用于多个发射和接收天线的广义同相
公开(公告)号：US08077785B1
公开(公告)日：2011-12-13
申请号：US12098924
申请日：2008-04-07
申请人： Jungwon Lee , Rohit U. Nabar , Jihwan P. Choi , Hui-Ling Lou
发明人： Jungwon Lee , Rohit U. Nabar , Jihwan P. Choi , Hui-Ling Lou
IPC分类号： H04K1/10 , H04L27/28
CPC分类号： H04B7/0682 , H04B7/0413 , H04B7/0465
摘要： A method for determining a phase of each of a plurality of transmitting antennas in a multiple input and multiple output (MIMO) communication system includes: calculating, for first and second ones of the plurality of transmitting antennas, a value based on first and second groups of channel gains, the first group including channel gains between the first transmitting antenna and each of a plurality of receiving antennas, the second group including channel gains between the second transmitting antenna and each of the plurality of receiving antennas; and determining the phase of each of the plurality of transmitting antennas based on at least the value.
摘要翻译：一种用于确定多输入多输出（MIMO）通信系统中的多个发射天线中的每一个的相位的方法，包括：针对所述多个发射天线中的第一和第二发射天线的第一和第二发射天线，基于第一和第二组所述第一组包括所述第一发射天线与所述多个接收天线中的每一个之间的信道增益，所述第二组包括所述第二发射天线与所述多个接收天线中的每一个之间的信道增益; 以及至少基于所述值确定所述多个发射天线中的每一个的相位。

56. 发明授权

US08009097B1 Beamforming with partial channel knowledge 有权
标题翻译：具有部分渠道知识的波束成形
公开(公告)号：US08009097B1
公开(公告)日：2011-08-30
申请号：US13030738
申请日：2011-02-18
申请人： Jungwon Lee , Rohit U. Nabar
发明人： Jungwon Lee , Rohit U. Nabar
IPC分类号： H01Q3/00
CPC分类号： H01Q25/00 , H01Q1/246 , H01Q21/06 , H01Q21/293
摘要： A method in a transmitter for selecting steering vectors for simultaneously transmitting a plurality of streams (NS) between the transmitter and a receiver, where the receiver has NR receive antennas, where the transmitter knows respective channels associated with M receive antennas of the receiver, and where M is less than NR, includes constructing a partial channel matrix that describes a multiple input, multiple output (MIMO) channel between the transmitter and the M receive antennas, generating L independent vectors using the partial channel matrix, wherein L is a rank of the partial channel matrix, selecting a respective steering vector for each of the plurality of streams to be transmitted to the receiver, including, if NS is less than or equal to L, selecting NS of the L independent vectors as the steering vectors, and, if NS is greater than L, (i) selecting the L independent vectors as steering vectors to steer L of the plurality of streams; and (ii) selecting NS−L orthogonal vectors in a null space of the L independent vectors.
摘要翻译：一种用于选择用于在发射机和接收机之间同时发射多个流（NS）的导频向量的方法，其中接收机具有NR个接收天线，其中发射机知道与接收机的M个接收天线相关联的各个信道，以及其中M小于NR，包括构建描述发射机和M个接收天线之间的多输入多输出（MIMO）信道的部分信道矩阵，使用部分信道矩阵生成L个独立向量，其中L是部分信道矩阵，选择要发送到接收机的多个流中的每一个的相应导向矢量，如果NS小于或等于L，则选择L个独立向量的NS作为导向矢量，如果NS大于L，（i）选择L个独立向量作为引导多个流的L的导向向量; 和（ii）在L个独立向量的零空间中选择NS-L正交向量。

57. 发明授权

US07970066B1 Tracking automatic gain control of orthogonal frequency domain multiplexing systems 有权
标题翻译：跟踪正交频域复用系统的自动增益控制
公开(公告)号：US07970066B1
公开(公告)日：2011-06-28
申请号：US11963294
申请日：2007-12-21
申请人： Jungwon Lee , Qing Zhao , Hui-Ling Lou
发明人： Jungwon Lee , Qing Zhao , Hui-Ling Lou
IPC分类号： H04L27/28
CPC分类号： H04L27/08 , H03G3/3052 , H03G3/3078 , H04L27/2626
摘要： A system includes an input, a variable gain amplifier (VGA), and an automatic gain control (AGC) module. The input receives an input signal. The input signal includes frames of N symbols modulated using orthogonal frequency division multiplexing (OFDM), wherein a cyclic prefix (CP) precedes each of the N symbols, and wherein N is an integer greater than 1. The VGA provides a gain when amplifying the input signal. The AGC module selectively adjusts the gain of the VGA during the CP preceding M of the N symbols, wherein M is an integer greater than 1.
摘要翻译：一种系统包括输入，可变增益放大器（VGA）和自动增益控制（AGC）模块。输入接收输入信号。输入信号包括使用正交频分复用（OFDM）调制的N个符号的帧，其中循环前缀（CP）在N个符号之前，并且其中N是大于1的整数。当VGA放大输入信号。 AGC模块在N个符号之前的M之前的CP期间选择性地调整VGA的增益，其中M是大于1的整数。

58. 发明授权

US07899107B1 Preamble detection using low-complexity cross-correlation 有权
标题翻译：使用低复杂度互相关的前导码检测
公开(公告)号：US07899107B1
公开(公告)日：2011-03-01
申请号：US11732095
申请日：2007-04-02
申请人： Jungwon Lee
发明人： Jungwon Lee
IPC分类号： H04B1/00
CPC分类号： H04L27/2655 , H04L27/2613 , H04L27/2656 , H04L27/2675
摘要： A system includes a differential demodulation module that differentially demodulates modulated signals. A cross-correlation module generates cross-correlation values by cross-correlating states of X symbols in the differentially demodulated signals with corresponding states of X predetermined symbols in each of Y preamble sequences, and determines whether one of the Y preamble sequences is present in the modulated signals, where X and Y are integers greater than 1. The cross-correlation module includes a state detection module that detects the states of the X symbols in the differentially demodulated signals, where each of the X symbols has one of a first state and a second state, and a summing module that generates the cross-correlation values by generating X sums for each of the Y preamble sequences by adding each of the states of the X symbols with the corresponding states of the X predetermined symbols in each of the Y preamble sequences.
摘要翻译：一种系统包括对调制信号进行差分解调的差分解调模块。互相关模块通过将差分解调信号中的X个符号的状态与Y个前同步码序列中的每一个中的X个预定符号的相应状态相互相关的状态产生互相关值，并且确定Y个前同步码序列之一是否存在于调制信号，其中X和Y是大于1的整数。互相关模块包括状态检测模块，其检测差分解调信号中的X个符号的状态，其中每个X符号具有第一状态和第二状态，以及求和模块，其通过将X个符号的每个状态与X个预定符号中的每个的相应状态相加，生成Y个前同步码序列的X个和，生成互相关值前序序列。

59. 发明授权

US07782751B1 Systems and methods for computing a relative path delay between multiple transmission sources 有权
标题翻译：用于计算多个传输源之间相对路径延迟的系统和方法
公开(公告)号：US07782751B1
公开(公告)日：2010-08-24
申请号：US12176976
申请日：2008-07-21
申请人： Jungwon Lee , Jiwoong Choi , Jihwan P. Choi
发明人： Jungwon Lee , Jiwoong Choi , Jihwan P. Choi
IPC分类号： H04J11/00 , H04J3/06
CPC分类号： H04W40/38 , H04J11/0063 , H04L25/0202 , H04L27/2601
摘要： Systems and methods are provided for computing a relative path delay between multiple transmitting source to select a source that is closest to a receiving device. Preamble sequences unique to each source are received by a receiving device. The receiving devices determines based on a channel estimation or differential algorithm which transmitting source is closer to the receiving device. The channel estimation algorithm computes the path delay based on a channel estimation correlation at different preamble sequence indices. The differential algorithm computes the path delay based on a correlation between the received and transmitted preamble sequences at different preamble sequence indices. The receiving device selects the closer of the multiple sources to be the source from which to extract data.
摘要翻译：提供的系统和方法用于计算多个发送源之间的相对路径延迟，以选择最接近接收设备的源。每个源独有的前导序列由接收设备接收。接收装置基于信道估计或差分算法确定发射源更靠近接收装置。信道估计算法基于在不同前同步码序列索引处的信道估计相关性来计算路径延迟。差分算法基于在不同前同步码序列索引处的接收和发送前同步码序列之间的相关性来计算路径延迟。接收设备选择要从中提取数据的源的更多的源。

60. 发明授权

US07756003B1 Adaptive OFDM transmitter based on carrier frequency offset 有权
标题翻译：基于载波频偏的自适应OFDM发射机
公开(公告)号：US07756003B1
公开(公告)日：2010-07-13
申请号：US10986130
申请日：2004-11-10
申请人： Jungwon Lee , Hui-Ling Lou , Dimitrios-Alexandros Toumpakaris
发明人： Jungwon Lee , Hui-Ling Lou , Dimitrios-Alexandros Toumpakaris
IPC分类号： H04J11/00 , G01R31/08 , H04J3/16 , H04L27/28 , H04B17/00
CPC分类号： H04L27/2657 , H04B7/01
摘要： A system comprises a transmitter module that receives transmitter data, that includes at least one transmitter operating parameter and that generates an orthogonal frequency division multiplexing (OFDM) signal based on the transmitter data and the at least one transmitter operating parameter. An operating parameters generating module receives a carrier frequency offset (CFO), communicates with the transmitter module and adjusts the at least one transmitter operating parameter based on the CFO. The transmitter module adjusts a parameter of at least one of a channel coding module, a modulating module, and/or a power control module based on the CFO.
摘要翻译：一种系统包括发射机模块，其接收包括至少一个发射机操作参数并且基于发射机数据和至少一个发射机操作参数产生正交频分复用（OFDM）信号的发射机数据。操作参数产生模块接收载波频率偏移（CFO），与发射机模块通信，并且基于CFO调整至少一个发射机操作参数。发射机模块基于CFO调整信道编码模块，调制模块和/或功率控制模块中的至少一个的参数。

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