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1. 发明申请

US20190068639A1 DETERMINATION OF PLAUSIBILITY OF INTELLIGENT TRANSPORT SYSTEM MESSAGES 审中-公开
公开(公告)号：US20190068639A1
公开(公告)日：2019-02-28
申请号：US16102972
申请日：2018-08-14
申请人： Paul Dean Alexander , John Lawrence Buetefuer , Malik Khan
发明人： Paul Dean Alexander , John Lawrence Buetefuer , Malik Khan
IPC分类号： H04L29/06 , H04W4/46 , H04W12/06
摘要： Disclosed herein is a method and system for determining plausibility of intelligent transport system (ITS) messages via a wireless communications channel at one or more message receivers. The method includes receiving a first ITS message having a first characteristic and receiving a second associated ITS message having a second characteristic. The method uses the first characteristic and the second characteristic to satisfy at least one predetermined criterion and determines plausibility of at least one of the first ITS message, the second ITS message and a third ITS message. The characteristic includes a PHY-layer or MAC-layer characteristic. The method is used to distinguish between genuine and spoofed messages to reduce the possibility of an attack.

2. 发明授权

US08923419B2 Method and system for communication in a wireless network 有权
标题翻译：无线网络通信的方法和系统
公开(公告)号：US08923419B2
公开(公告)日：2014-12-30
申请号：US12224457
申请日：2007-02-27
申请人： Paul Dean Alexander , Alexander James Grant , David Victor Lawrie Haley
发明人： Paul Dean Alexander , Alexander James Grant , David Victor Lawrie Haley
IPC分类号： H04K1/10 , H04L25/02 , H04L27/26 , H04L25/03
CPC分类号： H04L25/022 , H04B1/10 , H04B1/16 , H04L25/0224 , H04L25/03159 , H04L27/2647
摘要： Methods and apparatus are described for processing data in a wireless communication network. Iterative estimation techniques are used to enable tracking of time-varying communication channels. A signal is transmitted over a channel in the network, the signal comprising a sequence of symbols carried on a plurality of sub-carriers. Boot-up estimator (304) estimates, in a time domain, parameters of a model of the channel based on the received signal. A domain converter (206) transforms at least one of the estimated parameters from the time domain to provide at least one transformed parameter in a second domain. An equalizer (210) and decoder (212) determine estimates of symbols from the received signal using the at least one transformed parameter, and tracking estimator (314) updates the estimated model parameters during reception of the signal using at least one estimated symbol.
摘要翻译：描述了用于在无线通信网络中处理数据的方法和装置。使用迭代估计技术来跟踪时变通信信道。信号通过网络中的信道发送，该信号包括在多个子载波上承载的码元序列。启动估计器（304）在时域中估计基于接收信号的信道模型的参数。域转换器（206）从时域转换估计参数中的至少一个以在第二域中提供至少一个变换参数。均衡器（210）和解码器（212）使用至少一个变换参数确定来自接收信号的符号的估计，并且跟踪估计器（314）使用至少一个估计符号在接收信号期间更新估计的模型参数。

3. 发明申请

US20130200223A1 CROSSING SAFETY SYSTEM 审中-公开
标题翻译：交叉安全系统
公开(公告)号：US20130200223A1
公开(公告)日：2013-08-08
申请号：US13639106
申请日：2011-04-05
申请人： Paul Dean Alexander , David Victor Lawrie Haley
发明人： Paul Dean Alexander , David Victor Lawrie Haley
IPC分类号： B61L29/30
CPC分类号： B61L29/30 , B61L23/041 , B61L29/28 , B61L29/32
摘要： A system is described that provides redundant communication at a railway crossing. The system comprises a first communication unit for transmitting information associated with a railway vehicle approaching or near the railway crossing on a railway track. A first active warning sign located at or near the railway crossing receives and transmits information associated with the railway crossing. The system includes an onboard equipment unit located on a roadway vehicle approaching or near the railway crossing, the onboard equipment unit comprising a second communication unit for receiving information from the first communication unit and the active warning sign; a processor for processing the received information to determine a first threat indicator indicative of a potential collision, and a user interface for communicating the threat indicator to a user. The system may include sensors to detect and communicate the presence of a train.
摘要翻译：描述了在铁路路口提供冗余通信的系统。该系统包括第一通信单元，用于发送与在铁路轨道上接近或靠近铁路路口的铁路车辆相关联的信息。位于铁路过境处或附近的第一个主动警告信号，收发铁路交通信息。该系统包括位于接近或靠近铁路道口的道路车辆上的车载设备单元，车载设备单元包括用于从第一通信单元接收信息的第二通信单元和主动警告标志; 用于处理所接收的信息以确定指示潜在的冲突的第一威胁指示符的处理器，以及用于将威胁指示符传送给用户的用户界面。该系统可以包括用于检测和通信列车的存在的传感器。

4. 发明申请

US20130094620A1 ESTIMATION OF A MULTIPATH SIGNAL IN A WIRELESS COMMUNICATION SYSTEM 有权
标题翻译：无线通信系统中多路信号的估计
公开(公告)号：US20130094620A1
公开(公告)日：2013-04-18
申请号：US13805234
申请日：2011-06-24
申请人： Paul Dean Alexander , Nick Letzepis , Alexander James Grant , David Victor Lawrie Haley
发明人： Paul Dean Alexander , Nick Letzepis , Alexander James Grant , David Victor Lawrie Haley
IPC分类号： H04B1/10 , H04L27/26 , H04L27/06
CPC分类号： H04B1/1081 , H04J11/0063 , H04L25/0204 , H04L25/022 , H04L25/0222 , H04L25/0242 , H04L27/06 , H04L27/2649 , H04L27/2657 , H04L27/2671 , H04L27/2695
摘要： Described herein is a method and system for estimating a time-varying multipath communication channel. The system comprises a receiver for receiving a signal comprising a data packet transmitted over the multipath communication channel. The system also comprises a frequency-domain channel estimator that generates a frequency-domain channel estimate based on the received signal. The system further comprises a time-domain channel modeller that receives the frequency-domain channel estimate and generates an estimate of parameters in a time-domain model of the multipath communication channel. The model characterises the multipath communication channel as a delay line with a plurality of taps, each tap having tap parameters defining a delay, a Doppler and a gain for the tap. The tap parameters are constant over the data packet.
摘要翻译：这里描述了一种用于估计时变多路径通信信道的方法和系统。该系统包括用于接收包括通过多路径通信信道发送的数据分组的信号的接收机。该系统还包括频域信道估计器，其基于接收到的信号产生频域信道估计。该系统还包括时域信道建模器，其接收频域信道估计并产生多径通信信道的时域模型中的参数估计。该模型将多径通信信道表征为具有多个抽头的延迟线，每个抽头具有定义延迟的抽头参数，抽头的多普勒和增益。抽头参数在数据包上是恒定的。

5. 发明授权

US09698843B2 Extracting parameters from a communications channel 有权
公开(公告)号：US09698843B2
公开(公告)日：2017-07-04
申请号：US13511663
申请日：2010-11-29
申请人： Paul Dean Alexander , David Victor Lawrie Haley
发明人： Paul Dean Alexander , David Victor Lawrie Haley
IPC分类号： H04B3/46 , H04B1/10 , H04L25/02 , H04L1/20 , H04B17/327 , H04B17/345 , H04B17/364 , H04B17/373 , H04B17/391
CPC分类号： H04B1/1081 , H04B17/327 , H04B17/345 , H04B17/364 , H04B17/373 , H04B17/391 , H04B17/3913 , H04L1/205 , H04L25/0204 , H04L25/022
摘要： A method for extracting a parameter of a communication channel from a channel estimate that characterizes the communication channel in terms of a frequency response over time. The method includes generating a set of feature identifiers that characterize features of the channel, for example energy peaks or troughs and determining the parameter, for example time delay of a multipath signal or frequency offset of a multipath signal, dependent on the feature identifiers. Methods using the parameter are also described including methods to estimate the environment.

6. 发明授权

US09008584B2 Environment estimation in a wireless communication system 有权
标题翻译：无线通信系统中的环境估计
公开(公告)号：US09008584B2
公开(公告)日：2015-04-14
申请号：US13379295
申请日：2010-06-18
申请人： Paul Dean Alexander , David Victor Lawrie Haley , Alexander James Grant
发明人： Paul Dean Alexander , David Victor Lawrie Haley , Alexander James Grant
IPC分类号： H04W24/00 , G01S13/00 , G01S13/93
CPC分类号： G01S13/003 , G01S13/931 , G01S2013/9339 , G01S2013/9353
摘要： A method and system are described for estimating an environment surrounding a wireless communication system, the environment including at least one inflector that inflects transmitted signals. An observation generator receives an input signal transmitted from a transmitter to a receiver via a wireless communication channel and also receives system state information pertaining to at least one of the receiver, the transmitter and the inflector. An observation processor uses observations from the observation generator to estimate at least one property of the inflector based on the received input signal and the system state information.
摘要翻译：描述了一种用于估计无线通信系统周围环境的方法和系统，该环境包括折射发射信号的至少一个偏转器。观测发生器经由无线通信信道接收从发射机发送到接收机的输入信号，并且还接收与接收机，发射机和反射器中的至少一个有关的系统状态信息。观察处理器使用来自观察发生器的观测值，基于所接收的输入信号和系统状态信息来估计变幅器的至少一个特性。

7. 发明申请

US20120225665A1 CHARACTERISATION OF A WIRELESS COMMUNICATIONS LINK 有权
标题翻译：无线通信链路的表征
公开(公告)号：US20120225665A1
公开(公告)日：2012-09-06
申请号：US13379318
申请日：2010-06-18
申请人： Paul Dean Alexander , David Victor Lawrie Haley
发明人： Paul Dean Alexander , David Victor Lawrie Haley
IPC分类号： H04W24/00
CPC分类号： H04B17/309 , H04B17/104 , H04B17/27 , H04B17/391 , H04W52/242
摘要： A system and method are described for characterising a wireless communications link as line-of-sight (LOS) or non line-of-sight (NLOS). The method comprises receiving data (T) representing a position of a transmitter, receiving data (R) representing a position of a receiver, receiving a measure of transmitted power at an output of the transmitter (PT) and receiving a measure of received power at an input to the receiver (PR). An NLOS detector (400) generates at least one non line-of-sight metric to characterise the wireless link between the transmitter and the receiver based on the position of the receiver, the position of the transmitter, the transmitted power and the received power.
摘要翻译：描述了将无线通信链路表征为视线（LOS）或非视距（NLOS）的系统和方法。该方法包括接收表示发射机位置的数据（T），接收表示接收机位置的数据（R），在发射机（PT）的输出处接收发射功率的测量值，并接收接收功率的测量值到接收机（PR）的输入。基于接收机的位置，发射机的位置，发射功率和接收功率，NLOS检测器（400）生成至少一个非视距度量以表征发射机和接收机之间的无线链路。

8. 发明申请

US20080317150A1 FILTER STRUCTURE FOR ITERATIVE SIGNAL PROCESSING 有权
标题翻译：用于迭代信号处理的滤波器结构
公开(公告)号：US20080317150A1
公开(公告)日：2008-12-25
申请号：US12195492
申请日：2008-08-21
申请人： Paul Dean Alexander , Alexander James Grant , Lars Kildehoj Rasmussen , Stephen Peter Jakas
发明人： Paul Dean Alexander , Alexander James Grant , Lars Kildehoj Rasmussen , Stephen Peter Jakas
IPC分类号： H04L27/28 , H04J3/06 , H04B1/10 , H04L27/06
CPC分类号： H04L25/0202 , H04L25/0204 , H04L25/03171 , H04L27/2657 , H04L27/2662 , H04L27/2675
摘要： The present invention relates to improved multiple access communications. In one form, the invention relates to an improved signal processing method and apparatus for an iterative method of determining the reception of a signal in a multi user packet based wireless OFDM (Orthogonal Frequency Division Multiplexing) communication system. In other forms the present invention provides recursive filtering for joint iterative decoding in a variety of systems and functions such as linear multiple access channel decoders, iterative equalisation, iterative joint channel estimation and detection/decoding, iterative space-time processing, iterative multi user interference cancellation and iterative demodulation. In one particular form the present invention provides an iterative decoding circuit for a wireless multiuser communications receiver comprising a first signal processing means for receiving at least one received signal, said first signal processing means comprising at least two linear iterative filters such that the first linear iterative filter provides an estimate of a selected received signal to an estimated signal output and a second linear iterative filter provides estimates of at least one other received signal, delayed by one iteration cycle, to an input of said first linear iterative filter, a second signal processing means for receiving the estimated signal output of the first linear iterative filter and providing a further received signal estimate to the input of the first signal processing means in a succeeding iteration cycle of the decoding circuit.
摘要翻译：本发明涉及改进的多址通信。在一种形式中，本发明涉及一种用于在基于多用户分组的无线OFDM（正交频分复用）通信系统中确定信号的接收的迭代方法的改进的信号处理方法和装置。在其他形式中，本发明提供了各种系统和功能中的联合迭代解码的递归滤波，例如线性多址信道解码器，迭代均衡，迭代联合信道估计和检测/解码，迭代空时处理，迭代多用户干扰取消和迭代解调。在一个特定形式中，本发明提供了一种用于无线多用户通信接收机的迭代解码电路，包括用于接收至少一个接收信号的第一信号处理装置，所述第一信号处理装置包括至少两个线性迭代滤波器，使得第一线性迭代滤波器将所选接收信号的估计提供给估计的信号输出，第二线性迭代滤波器将延迟了一个迭代周期的至少一个其它接收信号的估计提供给所述第一线性迭代滤波器的输入，第二信号处理用于接收所述第一线性迭代滤波器的估计信号输出并且在所述解码电路的后续迭代循环中向所述第一信号处理装置的输入提供另外的接收信号估计的装置。

9. 发明申请

US20170155532A1 WIRELESS RECEIVER 审中-公开
公开(公告)号：US20170155532A1
公开(公告)日：2017-06-01
申请号：US15362426
申请日：2016-11-28
申请人： Paul Dean Alexander
发明人： Paul Dean Alexander
IPC分类号： H04L27/233 , H04L25/03 , H04L25/02
CPC分类号： H04L27/2338 , H04L1/0054 , H04L25/0212 , H04L25/0258 , H04L25/03006 , H04L25/067 , H04L2025/03624
摘要： The present invention relates to a method and apparatus for demodulation in a wireless communications system transmitted across a wireless communications channel. The described wireless receiver includes a first antenna for receiving a wireless signal including a symbol transmitted across a wireless communications channel perceived by the first antenna, an observation modifier for generating a modified observation (y) of the symbol based on a product of the received observation (r) and the complex conjugate of a channel estimate (h*), a log-likelihood ratio (LLR) module generating log-likelihood ratios (LLRs) based on the modified observation and the channel estimate, and a maximum-likelihood-based decoder for decoding the symbol based on the LLRs.

10. 发明申请

US20170155474A1 WIRELESS RECEIVER 审中-公开
公开(公告)号：US20170155474A1
公开(公告)日：2017-06-01
申请号：US15362364
申请日：2016-11-28
申请人： Paul Dean Alexander
发明人： Paul Dean Alexander
IPC分类号： H04L1/00 , H04L25/02
CPC分类号： H04L1/0054 , H03M13/1102 , H03M13/2957 , H03M13/41 , H03M13/4169 , H03M13/6337 , H03M13/6362 , H04L1/005 , H04L1/006 , H04L1/203 , H04L1/208 , H04L25/024 , H04L25/03203 , H04L25/03292 , H04L27/2649
摘要： The present invention relates to a method and apparatus for channel estimation between a transmitter and a receiver in a wireless communications system. In one arrangement, the method comprises: receiving at the receiver a first sequence of bits representing a first sequence of coded symbols transmitted over the communications channel; decoding the first sequence of coded symbols using maximum-likelihood based decoding including: generating traceback outcomes by tracing backwards the first sequence of bits through a maximum-likelihood based traceback path, the traceback outcomes including a first portion associated with a first traceback depth and a second portion associated with a second traceback depth that is deeper than the first traceback depth; generating a channel estimate of the communications channel based on the first portion of the traceback outcomes; and generating an estimate of at least some information bits coded in the first sequence of coded symbols based on the second portion of the traceback outcomes.

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