专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明申请

US20060209979A1 Frequency offset tracking 有权
标题翻译：频率偏移跟踪
公开(公告)号：US20060209979A1
公开(公告)日：2006-09-21
申请号：US11261513
申请日：2005-10-31
申请人： Magnus Sandell , Darren McNamara , Steve Parker
发明人： Magnus Sandell , Darren McNamara , Steve Parker
IPC分类号： H04L1/02
CPC分类号： H04L27/2657 , H04L27/2675 , H04L2027/0032 , H04L2027/0065 , H04L2027/0075
摘要： The present invention relates to estimating and correcting for frequency offset errors in wireless receivers, and is particularly but not exclusively related to MIMO WLAN applications. The present invention provides an improved method of tracking receiver frequency offsets in a receiver for MIMO systems. These receiver based frequency offset components are caused by errors or inaccuracies in various receiver sub-systems such as phase lock loops or carrier frequency oscillator error, and sampling clock rate errors. The frequency offsets due to each of a number of receiver sub-systems are estimated by monitoring frequency offsets on a number of channels or subcarriers (such as OFDM pilot channels) on different frequencies. These channel frequency offsets are preferably estimated by detecting the phase rotation between adjacent pilot symbols on each respective channel. They are then weighted according to a quality parameter of the estimates, which corresponds to their accuracy. An example of a quality parameter is the effective SNR of the respective channels, or preferably the error variance of the phase rotation. In an embodiment the quality parameter is or is proportional to ∥Hx∥2. The weighted channel frequency offsets are then used to determine one or more receiver sub-system frequency offset components. For example a least squares line fit analysis can be performed.
摘要翻译：本发明涉及估计和校正无线接收机中的频率偏移误差，并且特别地但并不排他地涉及MIMO WLAN应用。本发明提供了一种在MIMO系统的接收机中跟踪接收机频率偏移的改进方法。这些基于接收机的频率偏移分量由各种接收机子系统中的错误或不准确性引起，例如锁相环或载波频率振荡器错误以及采样时钟速率误差。通过在不同频率上的多个信道或子载波（例如OFDM导频信道）上监视频率偏移来估计由多个接收机子系统中的每一个引起的频率偏移。这些信道频率偏移优选地通过检测每个相应信道上的相邻导频符号之间的相位旋转来估计。然后根据估计的质量参数对它们进行加权，这对应于它们的准确度。质量参数的示例是相应通道的有效SNR，或优选地是相位旋转的误差方差。在一个实施例中，质量参数为或等于∥Hx∥2。加权的信道频率偏移然后用于确定一个或多个接收机子系统频率偏移分量。例如，可以执行最小二乘线拟合分析。

2. 发明申请

US20080019262A1 Wireless Communication Apparatus 审中-公开
标题翻译：无线通信设备
公开(公告)号：US20080019262A1
公开(公告)日：2008-01-24
申请号：US11757057
申请日：2007-06-01
申请人： Andrew Lillie , Darren McNamara , Magnus Sandell
发明人： Andrew Lillie , Darren McNamara , Magnus Sandell
IPC分类号： H04J11/00
CPC分类号： H04L25/0246 , H04L27/2647
摘要： This invention relates to methods, apparatus, and processor control code for signal detection in Multiple Input Multiple Output Orthogonal Frequency Division Multiplexed (MIMO-OFDM) communications systems. A method for determining outputs from a received signal in a lattice-reduction-aided receiver based multi-carrier wireless communications system having a plurality of sub-carriers divided into a plurality of sets of sub-carriers, the method comprising performing a detection method for each of said sets, the detection method comprising the step of applying lattice reduction to said set of sub-carriers thereby generating a reduced basis channel response.
摘要翻译：本发明涉及用于多输入多输出正交频分复用（MIMO-OFDM）通信系统中的信号检测的方法，装置和处理器控制码。一种用于在具有被划分成多组副载波的多个子载波的基于格子约简的辅助接收机的多载波无线通信系统中确定来自接收信号的输出的方法，所述方法包括执行检测方法每个所述集合，所述检测方法包括对所述子载波集合应用网格约简的步骤，从而生成减少的基本信道响应。

3. 发明申请

US20080075183A1 WIRELESS COMMUNICATION APPARATUS 审中-公开
标题翻译：无线通信设备
公开(公告)号：US20080075183A1
公开(公告)日：2008-03-27
申请号：US11848265
申请日：2007-08-31
申请人： Vishakan PONNAMPALAM , Magnus Sandell , Andrew Lillie , Darren McNamara
发明人： Vishakan PONNAMPALAM , Magnus Sandell , Andrew Lillie , Darren McNamara
IPC分类号： H04L27/28
CPC分类号： H04L25/067 , H04L25/03242
摘要： In a lattice-reduction-aided receiver based wireless communications system, soft estimates of transmitted bit values are determined from a received signal by applying lattice reduction to the channel estimate and equalising the received signal in accordance with the reduced basis channel, and determining probabilities of transmitted bits having particular values by generating a set of candidate vectors in the reduced basis based on nearest candidate vectors, determining a corresponding transmitted symbol vector for each candidate vector and, on the basis of the received signal determining the probability of each transmitted bit value having been transmitted.
摘要翻译：在基于格子减少辅助的基于接收机的无线通信系统中，通过对信道估计应用网格约简并根据减少的基本信道对接收到的信号进行均衡，从接收信号确定发送比特值的软估计，并且确定通过基于最近的候选向量在减少的基础中生成一组候选向量来确定具有特定值的发送比特，确定每个候选向量的对应的发送符号向量，并且基于确定每个发送的比特值具有的概率的接收信号被传送

4. 发明申请

US20050195734A1 Transmission signals, methods and apparatus 审中-公开
标题翻译：传输信号，方法和装置
公开(公告)号：US20050195734A1
公开(公告)日：2005-09-08
申请号：US11033865
申请日：2005-01-13
申请人： Magnus Sandell , Darren McNamara
发明人： Magnus Sandell , Darren McNamara
IPC分类号： H04J99/00 , H04L27/26 , H04J11/00
CPC分类号： H04B7/0684 , H04L5/0023 , H04L5/0048 , H04L25/0226 , H04L27/2613
摘要： The invention relates to apparatus, methods, processor control code and signals for channel estimation in MIMO (Multiple-input Multiple-output) OFDM (Orthogonal Frequency Division Multiplexed) communication systems. An OFDM signal is transmitted from an OFDM transmitter using a plurality of transmit antennas but has one or more nulled subcarriers, corresponding to windowing in the frequency domain. The OFDM signal is adapted for channel estimation for channels associated with said transmit antennas by the inclusion of orthogonal training sequence data in the signal from each said antenna. The training sequence data is derived from substantially orthogonal training sequences for each said transmit antenna, the training sequences being constructed based upon sequences of values Xmk=exp(−j2πkm/M) where k indexes a value in a said sequence, m indexes a transmit antenna, and M is the number of transmit antennas. Embodiments of these techniques provide training sequences that are more robust to, inter alia, nulled subcarriers.
摘要翻译：本发明涉及用于MIMO（多输入多输出）OFDM（正交频分复用）通信系统中的信道估计的装置，方法，处理器控制代码和信号。使用多个发送天线从OFDM发射机发送OFDM信号，但是具有与频域中的窗口对应的一个或多个无效副载波。通过在每个所述天线的信号中包括正交训练序列数据，OFDM信号适用于与所述发射天线相关联的信道的信道估计。训练序列数据是从每个所述发射天线的基本上正交的训练序列导出的，训练序列是根据值的序列构建的，该序列是在线性公式描述=“在线公式”end =“lead”→> X ＆lt;＆lt;＆gt;＆lt;＆lt;＆gt;＆lt;＆lt;＆gt; = exp（-j 2 pikm / M）<？in-line-formula description =“In-line Formulas”end =“tail”？> 对所述序列中的值进行索引，m对发射天线进行索引，M是发射天线的数量。这些技术的实施例提供对于特别是零位副载波更加鲁棒的训练序列。

5. 发明申请

US20140018087A1 INSERTING VIRTUAL CARRIER IN CONVENTIONAL OFDM HOST CARRIER IN COMMUNICATIONS SYSTEM 有权
标题翻译：在通信系统中的常规OFDM主机载体中插入虚拟载波
公开(公告)号：US20140018087A1
公开(公告)日：2014-01-16
申请号：US13983441
申请日：2012-02-01
申请人： Darren McNamara , Andrew Lillie , Peter Darwood , Martin Beale
发明人： Darren McNamara , Andrew Lillie , Peter Darwood , Martin Beale
IPC分类号： H04W72/04
CPC分类号： H04W72/0453 , H04L5/0007 , H04L5/0039 , H04L5/0048 , H04L5/0064 , H04L5/0094 , H04W4/70
摘要： A mobile communications system for communicating data to and/or from mobile communications devices. The mobile communications system comprises one or more base stations, each of which includes a transmitter and a receiver operable to provide a wireless access interface for communicating data to and/or from the mobile communications devices, the wireless access interface providing on a downlink a host carrier, the host carrier providing a plurality of resource elements across a first frequency range for communicating data; and a first and second mobile communications devices. The wireless access interface provided by the base stations is arranged to provide a virtual carrier, the virtual carrier providing one or more resource elements within a second frequency range which is within and smaller than the first frequency range, and the second mobile communications device is operable, upon detection of the virtual carrier, to receive downlink communications via the virtual carrier.
摘要翻译：一种用于向移动通信设备传送数据和/或从移动通信设备传送数据的移动通信系统。移动通信系统包括一个或多个基站，每个基站包括发射机和接收机，其可操作以提供用于向移动通信设备和/或从移动通信设备传送数据的无线接入接口，无线接入接口在下行链路上提供主机载波，主机载波在第一频率范围内提供多个资源元件，用于传送数据; 以及第一和第二移动通信设备。由基站提供的无线接入接口被配置为提供虚拟载波，所述虚拟载波提供在第一频率范围内和小于第一频率范围内的第二频率范围内的一个或多个资源元素，并且第二移动通信设备可操作在检测到虚拟载波时，经由虚拟载波接收下行链路通信。

6. 发明申请

US20050195913A1 Communications system, method and device 审中-公开
标题翻译：通信系统，方法和设备
公开(公告)号：US20050195913A1
公开(公告)日：2005-09-08
申请号：US11062840
申请日：2005-02-23
申请人： Darren McNamara
发明人： Darren McNamara
IPC分类号： H04J99/00 , H04B7/04 , H04B7/06 , H04B7/08 , H04J11/00 , H04L5/02 , H04L25/02 , H04L25/03 , H04L1/02
CPC分类号： H04L5/026 , H04B7/0413 , H04B7/06 , H04B7/08 , H04L25/0204 , H04L2025/03414
摘要： A communications system (101) comprises a transmitting device (102) and a receiving device (114). The transmitting device (102) comprises at least T transmit antennas (116), means for spreading (110) each of T symbols (x) in the time domain only to produce T time sequences of chips (x1, x2, X3=X) and transmitting the T time sequences of chips (X) from the T transmit antennas (116) respectively. The receiving device (114) comprises at least R receive antennas (118), means for despreading (120) the R time sequences of chips (y1, y2, y3=Y) received from the transmitting device (102) at the R receive antennas (118) respectively to a produce R received symbols (z), and means for processing (116-1) the R received symbols (z) to produce an estimate ({circumflex over (x)}) of the T symbols (x) spread at the transmitting device (102).
摘要翻译：通信系统（101）包括发送设备（102）和接收设备（114）。发射设备（102）包括至少T个发射天线（116），用于在时域中扩展（110）T个符号（x）中的每一个的装置，用于产生码片的时间序列（x <1 / 并且分别从T个发射天线（116）发送码片（X）的T个时间序列。接收设备（114）包括至少R个接收天线（118），用于解扩（120）码片的R个时间序列（y 1，y 2，y，y）的装置 R接收天线（118）从发射设备（102）分别接收到产生R个接收符号（z）的接收符号（z），以及用于处理（116-1）R接收的装置符号（z）以产生在发送设备（102）处扩展的T个符号（x）的估计（x）。

7. 发明申请

US20050190715A1 Communications system, method and devices 审中-公开
标题翻译：通信系统，方法和设备
公开(公告)号：US20050190715A1
公开(公告)日：2005-09-01
申请号：US11034812
申请日：2005-01-14
申请人： Darren McNamara
发明人： Darren McNamara
IPC分类号： H04J11/00 , H04B1/707 , H04B7/12 , H04B7/204 , H04J13/00 , H04J13/16 , H04J15/00 , H04L5/02 , H04L27/26 , H04Q7/38
CPC分类号： H04J13/16 , H04B1/7103 , H04B2201/70703 , H04B2201/709709 , H04J13/004 , H04L5/0026 , H04L27/2647
摘要： A communications system (301) is provided for carrying out spread spectrum communication. In a transmitting device (302) of the communications system 301, a spreading portion (310) spreads an input signal (d) using a spreading code (SC) and a transmitting portion (311, 306) transmits the signal (C) spread by the spreading portion (310). In a receiving device (314), a receiving portion (318, 325) receives the signal (Df) transmitted by the transmitting portion (311, 306), and a despreading portion (320) inversely spreads the signal (D) received by the receiving portion (318, 325) by using an inverse spreading code (ISC) corresponding to the spreading code (SC). The spreading code (SC) comprises a time spreading element (SFtime) indicating the amount of spreading in the time domain and a frequency spreading element (SFfreq) indicating the amount of spreading in the frequency domain. The time and frequency spreading elements (SFtime and SFfreq) in the spreading code (SC) are determined in dependence upon the number of different spreading codes in use.
摘要翻译：提供通信系统（301）用于进行扩频通信。在通信系统301的发送装置（302）中，扩展部（310）使用扩展码（SC）扩展输入信号（d），发送部（311,306）发送由扩展部分（310）。在接收设备（314）中，接收部分（318,325）接收由发送部分（311,306）发送的信号（Df），解扩部分（320）将由接收部分（318,325），通过使用与扩展码（SC）对应的逆扩展码（ISC）。扩展码（SC）包括指示时域中的扩展量的时间扩展元件（SF＆gt;时间＆gt;）和指示量的扩频元件（SF＆lt; freq＆lt; 在频域中扩展。扩展码（SC）中的时间和频率扩展元素（SF＆gt;时间＆lt;＆gt;和SF＆gt;频率）根据使用的不同扩展码的数量来确定。

8. 发明授权

US09661620B2 Mobile terminal and method using short identifier for resource scheduling 有权
公开(公告)号：US09661620B2
公开(公告)日：2017-05-23
申请号：US13983587
申请日：2012-02-03
申请人： Darren McNamara , Andrew Lillie , Peter Darwood , Martin Beale
发明人： Darren McNamara , Andrew Lillie , Peter Darwood , Martin Beale
IPC分类号： H04W72/04 , H04W72/12 , H04L5/00 , H04W8/26
CPC分类号： H04W72/042 , H04L5/0037 , H04W8/26 , H04W72/1205 , H04W72/1289
摘要： A mobile terminal for use in a mobile communications network includes a wireless access interface that provides a shared communications channel for communicating data to/from the mobile communications network, the shared channel divided in time into units of communications resource. The mobile terminal is configured to receive control information with a short identification number in association with an identification number allocated to the mobile terminal by the mobile communications network, the short identification number allocated to the mobile terminal by the mobile communications network for one super-frame including plural of the units of communications resource of the shared channel, the short identification number allocated to the mobile terminal as one member of a group of mobile terminals, and to receive a resource allocation message including the short identification number to identify the mobile terminal and to allocate units of the communications resource to the mobile terminal in one super-frame.

9. 发明授权

US09608784B2 Inserting virtual carrier in conventional OFDM host carrier in communications system 有权
公开(公告)号：US09608784B2
公开(公告)日：2017-03-28
申请号：US13983692
申请日：2012-02-01
申请人： Darren McNamara , Andrew Lillie , Peter Darwood , Martin Beale
发明人： Darren McNamara , Andrew Lillie , Peter Darwood , Martin Beale
IPC分类号： H04L5/00
CPC分类号： H04L5/0094 , H04L5/0007 , H04L5/0037 , H04L5/0039 , H04L5/0048 , H04L5/0064 , H04W72/042 , H04W72/0453
摘要： A base station communicating data to/from plural mobile terminals over plural OFDM sub-carriers within a coverage area. The base station allocates transmission resources provided by a first group of the plural OFDM sub-carriers within a first frequency band to mobile terminals of a first type and allocates transmission resources provided by a second group of the plural OFDM sub-carriers within a second frequency band to terminals of a second type, the second group being smaller than the first group and the second frequency band selected from within the first frequency band. The base station transmits control information including resource allocation information for terminals of the first type over a first bandwidth corresponding to the combined first and second groups of OFDM sub-carriers and transmits control information including resource allocation information for terminals of the second type over a second bandwidth corresponding to the second group of OFDM sub-carriers.

10. 发明申请

US20140119315A1 TELECOMMUNICATIONS METHOD AND SYSTEM 有权
标题翻译：电信方法与系统
公开(公告)号：US20140119315A1
公开(公告)日：2014-05-01
申请号：US14126169
申请日：2012-06-12
申请人： Peter Darwood , Darren McNamara
发明人： Peter Darwood , Darren McNamara
IPC分类号： H04W72/04
CPC分类号： H04W72/042 , H04W4/70 , H04W72/005
摘要： A mobile communications unit for communicating data to and/or from base stations, the unit configured to communicate data with one or more base stations via a wireless access interface provided by the one or more base stations; configured to receive transmissions from the one or more base stations via at least one carrier, wherein carriers are logically separate sets of physical resources within a frequency range, the resources of a carrier providing a communication channel; and configured, upon reception of allocation information including an indication of a location of common information within a first carrier, to access the common information in the first carrier, wherein the allocation information is provided in a second carrier and the common information is for at least one mobile unit using the first carrier and for at least one mobile unit using a second carrier.
摘要翻译：一种移动通信单元，用于向基站和/或从基站传送数据，该单元被配置为经由一个或多个基站提供的无线接入接口与一个或多个基站通信数据; 经配置以经由至少一个载波从所述一个或多个基站接收传输，其中载波是在频率范围内的逻辑上分开的物理资源集合，提供通信信道的载波的资源; 并且在接收到包括第一载波中的公共信息的位置的指示的分配信息时，配置为访问第一载波中的公共信息，其中分配信息被提供在第二载波中，并且公共信息至少是使用第一载体的一个移动单元和使用第二载波的至少一个移动单元。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式