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1.发明公开公开(公告)号：US20230291511A1
公开(公告)日：2023-09-14
申请号：US17691663
申请日：2022-03-10
CPC分类号： H04L5/0023 , G01S13/04
摘要： Complex-valued waveform samples in time-domain, frequency-domain and spatial-domain are organized into a plurality of dimensions. A vector of complex-valued samples is extracted from a multidimensional sample buffer. An input transform is applied to a vector of complex-valued samples to produce two vectors of real-valued samples. Each real-valued sample vector is processed to produce a two-dimensional codebook matrix and to generate a vector of indices into the columns of the generated codebook. The two indices vectors are merged to produce an encoded index stream. The encoded index stream along with the two codebooks is used to produce real-valued sample vectors. An output transform is applied to two real-valued sample vectors to produce a vector of complex-valued samples.
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2.发明公开公开(公告)号：US20230262485A1
公开(公告)日：2023-08-17
申请号：US17671456
申请日：2022-02-14
CPC分类号： H04W24/02 , H04B7/0617 , H04W28/06 , G01S7/02
摘要： A plurality of radar sensors and radio units are controlled and processed by a signal processing unit (SPU). Each radar sensor receives configuration, control, power management, and calibration messages along with compressed data stream for transmission from the SPU over a multi Giga-bit interface (MGBI). Each radar sensor transmits status messages and compressed received data stream to the SPU over an MGBI. The SPU performs radar signal processing and tracking upon decompressing the data stream received from the radar sensor. Each radio unit receives configuration, control, power management, and calibration messages along with compressed frequency-domain waveform samples for each transmitter antenna port and for each component carrier configured by the SPU over an MGBI. Each radio unit transmits status messages along with compressed calibration data and compressed frequency-domain waveform samples for each receive antenna port and for each component carrier configured by the SPU over an MGBI. The SPU decompresses the frequency-domain waveform samples, and performs radio baseband signal processing including channel estimation, transmit beamforming, and receive beamforming. The SPU establishes and maintains time synchronization with each radar sensor and radio unit connected to it over an MGBI.
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公开(公告)号：US20230305140A1
公开(公告)日：2023-09-28
申请号：US17682780
申请日：2022-02-28
CPC分类号： G01S13/872 , G01S13/726
摘要： Radar signal processing is performed using a plurality of signal processing units onboard a radar sensor unit. One of the signal processing units is designated as the primary processor whereas the remaining signal processing units are designated as secondary processors. Secondary processors, based on their configuration and capability, perform a subset of radar signal processing tasks. Secondary processors transmit a compressed bit stream of their partially processed results to the primary processor. The primary processor decompresses the bit streams received from a plurality of secondary processors, incorporates the partially processed results from a plurality of secondary processors with its locally processed results, performs final detections, and sends the final detections to a remote processor. When secondary processors perform detections in range, Doppler, and angle domains, and sends those to the primary processor, the primary processor employs consensus detection to produce final detections.
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公开(公告)号：US20230305129A1
公开(公告)日：2023-09-28
申请号：US17703641
申请日：2022-03-24
IPC分类号： G01S13/04
CPC分类号： G01S13/04
摘要： Multi-channel compressed analog-to-digital (ADC) samples along with compressed calibration data received from the radar unit are de-compressed on the centralized signal processing unit prior to calibration compensation and DC-offset removal. Time-domain samples on each antenna channel are processed into range-domain samples and range-Doppler samples using windowing and FFT operations. For each range-domain sample, angle-domain samples are generated by performing windowing and angle-domain FFT operation over antenna channels. Joint object detection is performed separately on de-compressed ADC samples, range-domain samples, range-Doppler samples, or range-angle samples to provide detection metrics and confidence levels for each detected object.
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公开(公告)号：US20230283667A1
公开(公告)日：2023-09-07
申请号：US17667612
申请日：2022-02-09
CPC分类号： H04L67/12 , G01S7/0236 , H01Q21/061 , G06K9/6289
摘要： A plurality of sensors are controlled and processed by an electronic control unit (ECU). Each sensor compresses the raw data samples, encapsulates them into IP packets, and transmits them to the ECU over the Ethernet transport. The ECU decompresses the IP packets, and individually performs sensor-specific signal processing prior to performing multi-modal sensor fusion. Additionally, if the underlying sensor is a Radar sensor, the ECU performs interference detection, interference mitigation, interference management, transmits compressed beamforming weights to enable transmit beamforming on the Radar sensor.
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公开(公告)号：US20120140922A1
公开(公告)日：2012-06-07
申请号：US12962449
申请日：2010-12-07
申请人： Ramesh Annavajjala , Wei Liu , Chunjie Duan , Toshiaki Koike-Akino , Yige Wang
发明人： Ramesh Annavajjala , Wei Liu , Chunjie Duan , Toshiaki Koike-Akino , Yige Wang
IPC分类号： H04W12/04
CPC分类号： H04L9/0875 , H04L2209/80 , H04W12/02 , H04W12/04
摘要： The first and second nodes in a wireless network estimate first and second channel response. The first node quantizes the first channel response to produce a first bit sequence, and a feed-forward message, which is transmit as a feed-forward message to the second node. The second node quantizes the second channel response using the feed-forward message to produce and an estimate of the first bit sequence, a second bit sequence and a feed-back message, which is transmitted to the first node. Then, the first and second nodes delete bits in the respective bit sequences using the feed-back and feed-forward message to generate first and second private keys with low bit mismatch rate.
摘要翻译： 无线网络中的第一和第二节点估计第一和第二信道响应。 第一节点量化第一信道响应以产生第一比特序列，以及作为前馈消息作为第二节点发送的前馈消息。 第二节点使用前馈消息量化第二信道响应，以产生第一比特序列，第二比特序列和反馈消息的估计，其被发送到第一节点。 然后，第一和第二节点使用反馈和前馈消息删除各个比特序列中的比特，以产生具有低比特失配率的第一和第二私钥。
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7.发明申请Method for Encoding Data Symbols with Implicitly Embedded Pilot Symbols in Resource Blocks for Wireless Networks 有权用于在无线网络的资源块中用隐式嵌入式导频符号编码数据符号的方法公开(公告)号：US20120002753A1
公开(公告)日：2012-01-05
申请号：US12827591
申请日：2010-06-30
CPC分类号： H04L5/0023 , H04L1/0606 , H04L1/0618 , H04L5/0048 , H04L25/0226 , H04L25/03343 , H04L27/345 , H04L2025/03426
摘要： A set of data symbols is selected from a set of modulation constellation, and a sample-mean of the set of data symbols is determined. Each data symbol is first shifted by the sample-mean to obtain a shifted data symbol, and then the shifted symbol is multiplied by a first constant to obtain a scaled data symbol. A second constant is added to the scaled data symbol to obtain a mapped data symbol. The sample-mean is multiplied by a third constant to obtain a sample-mean mapped symbol. The set of mapped data symbols and the sample-mean mapped symbol are then transmitted as a resource block.
摘要翻译： 从一组调制星座中选择一组数据符号，并且确定该组数据符号的采样均值。 首先将每个数据符号移位采样均值以获得移位的数据符号，然后将移位符号乘以第一常数以获得缩放的数据符号。 将第二常数添加到缩放的数据符号以获得映射的数据符号。 将样本均值乘以第三常数以获得样本均值映射符号。 然后将映射数据符号集合和采样均值映射符号作为资源块发送。
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公开(公告)号：US08811545B2
公开(公告)日：2014-08-19
申请号：US13291546
申请日：2011-11-08
申请人： Ramesh Annavajjala , Liangbin Li , Philip Orlik
发明人： Ramesh Annavajjala , Liangbin Li , Philip Orlik
CPC分类号： H04L5/0048 , H04J11/004 , H04L25/03171 , H04L27/2602 , H04L27/32 , H04L2025/03777
摘要： Interference in a received orthogonal frequency division multiplexing (OFDM) symbol, modulated according to selected constellation points sk, is reduced. The symbol includes a set of pilot signals and a set of data signals yk, where k is a number of consecutive subcarriers used for the pilot and the data signals. The pilot signals are thresholded to detect interfering pilot signals, which are then erased. Channels Ĥk are estimated using remaining pilot signals. The set of data signals are decoded based on the estimated channels Ĥk, and, for each bit bi in the set of data signals, a logarithmic likely ratio (LLR) log ∑ s k : b i = 0 1 y k - H ^ k s k 2 ∑ s k : b i = 1 1 y k - H ^ k s k 2 is determined. The LLR is an indicator of the likely interference.
摘要翻译： 根据所选择的星座点sk进行调制的接收正交频分复用（OFDM）符号中的干扰被减少。 符号包括一组导频信号和一组数据信号y k，其中k是用于导频和数据信号的连续副载波的数量。 导频信号被阈值以检测干扰导频信号，然后擦除导频信号。 使用剩余的导频信号估计信道Ĥk。 基于估计的信道Ĥk对该组数据信号进行解码，并且对于数据信号组中的每个比特bi，存在对数可能比（LLR）logΣΣsk：bi = 0 1yk-H ^ k skë2Σsk：bi = 1 1yk-H ^ k sk守2。 LLR是可能的干扰的指标。
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9.发明申请Method and System for Estimating Time of Arrival of Signals Using Maximum Eigenvalue Detection 审中-公开使用最大特征值检测估计信号到达时间的方法和系统公开(公告)号：US20130176174A1
公开(公告)日：2013-07-11
申请号：US13346889
申请日：2012-01-10
申请人： Ramesh Annavajjala , Philip Orlik
发明人： Ramesh Annavajjala , Philip Orlik
IPC分类号： G01S1/24
CPC分类号： G01S5/0221
摘要： A method estimates the time-of-arrival (ToA) of signals received via multipath channels. The received signal of a number of trials is first passed through a band-pass filter and then sampled. The presence of a channel tap within a time window is estimated by comparing a threshold to a largest eigenvalue of the covariance matrix of a time window. The signal samples are used to calculated a band region of a complete covariance matrix. After the band region has been updated for all signal samples, the covariance matrices for a moving window can be extracted from the band region. The ToA is estimated as the ending time of the leading window, which is the earliest window, such that the largest eigenvalue is larger than a given threshold.
摘要翻译： 一种方法估计通过多径信道接收的信号的到达时间（ToA）。 多次试验的接收信号首先通过带通滤波器，然后采样。 通过将阈值与时间窗的协方差矩阵的最大特征值进行比较来估计时间窗内的通道抽头的存在。 信号样本用于计算完整协方差矩阵的带区域。 在针对所有信号样本更新了带区域之后，可以从带区域提取用于移动窗口的协方差矩阵。 ToA被估计为作为最早窗口的前导窗口的结束时间，使得最大特征值大于给定阈值。
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公开(公告)号：US08509330B2
公开(公告)日：2013-08-13
申请号：US12894994
申请日：2010-09-30
申请人： Ramesh Annavajjala , Hobin Kim
发明人： Ramesh Annavajjala , Hobin Kim
IPC分类号： H04K1/10
CPC分类号： H04L5/0048 , H04L5/0007 , H04L25/0204 , H04L25/0212 , H04L25/022 , H04L25/0228 , H04L25/0242
摘要： Time-varying and frequency-selective channels in an orthogonal frequency division multiplexing (OFDM) network are estimated by first storing, in a buffer at a receiver, a received signal corresponding to a set of pilot tones of a set of OFDM symbols. The pilot tones are predetermined and inserted in frequency subcarriers and time slots of the OFDM symbol. A covariance matrix of the received signal is estimated. A diagonal matrix is estimated based on the covariance matrix and a variance of noise in the received signal. The diagonal matrix indicates delays of non-zero paths in a time domain. A channel impulse response (CIR) for each OFDM symbol is estimated using the diagonal matrix, and the received signal. Then, the CIR is transformed to the frequency domain to obtain the channel frequency response (CFR).
摘要翻译： 通过首先在接收机的缓冲器中存储对应于一组OFDM符号的一组导频音调的接收信号来估计正交频分复用（OFDM）网络中的时变和频率选择信道。 导频音被预先确定并插入在OFDM符号的频率子载波和时隙中。 估计接收信号的协方差矩阵。 基于协方差矩阵和接收信号中的噪声方差来估计对角矩阵。 对角矩阵表示时域中非零路径的延迟。 使用对角矩阵和接收信号来估计每个OFDM符号的信道脉冲响应（CIR）。 然后，将CIR转换到频域以获得信道频率响应（CFR）。
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