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。

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

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。

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。

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。

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.

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.

公开(公告)号：US20140036820A1

公开(公告)日：2014-02-06

申请号：US13983402

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

摘要： A base station receiving uplink data transmitted from mobile terminals of first type and mobile terminals of second type over a radio interface using plural sub-carriers. The mobile terminals of first type transmit uplink data on a first group of the sub-carriers over a first bandwidth and the mobile terminals of second type transmit uplink data on a second group of the sub-carriers within the first group of sub-carriers over a second bandwidth that is smaller than the first bandwidth. The base station is configured to grant uplink radio resources in response to random access request messages transmitted by mobile terminals of first type transmitted on a first random access channel and to grant uplink radio resources in response to random access request messages transmitted by mobile terminals of second type transmitted on a second random access channel, which are transmitted on sub-carriers within the second group of sub-carriers.

摘要翻译： 接收使用多个子载波的无线接口从第一类移动终端和第二类移动终端发送的上行链路数据的基站。 第一类型的移动终端通过第一带宽在第一组子载波上发送上行链路数据，并且第二类型的移动终端在第一子载波组内的第二组子载波上发送上行链路数据， 第二带宽小于第一带宽。 基站被配置为响应于在第一随机接入信道上发送的第一类型的移动终端发送的随机接入请求消息来授权上行链路无线电资源，并且响应于由第二随机接入信道的移动终端发送的随机接入请求消息来准许上行链路无线电资源 在第二随机接入信道上发送的类型，其在第二子载波组内的子载波上发送。

公开(公告)号：US20140011506A1

公开(公告)日：2014-01-09

申请号：US13983685

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： H04W72/0453 ,  H04L5/0007 ,  H04L5/0032 ,  H04L5/0039 ,  H04L5/0048 ,  H04L5/0064 ,  H04L5/0094 ,  H04L27/2626 ,  H04W72/04 ,  H04W72/042 ,  H04W72/0486

摘要： A network element for use in a mobile communications system and a method of using a network element for communicating data to/from mobile communications devices in a mobile communications system. The network element can provide a wireless access interface for communicating data to/from the mobile communications devices, the wireless access interface including: on a downlink a host carrier, the host carrier providing plural resource elements across a first frequency range; transmit data for a first group of mobile communications devices, wherein the data is distributed within the plural resource elements across the first frequency range; a virtual carrier via the wireless access interface, 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 transmit data for a second group of mobile communications devices via the virtual carrier.

摘要翻译： 用于移动通信系统的网络元件以及使用网络元件在移动通信系统中向/从移动通信设备传送数据的方法。 所述网元可以提供用于向/从所述移动通信设备传送数据的无线接入接口，所述无线接入接口包括：在主载波的下行链路上，所述主机载波在第一频率范围内提供多个资源元素; 发送用于第一组移动通信设备的数据，其中所述数据在所述第一频率范围内分布在所述多个资源元素内; 经由无线接入接口的虚拟载波，所述虚拟载波提供在所述第一频率范围内和小于所述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; 并且经由虚拟载波发送用于第二组移动通信设备的数据。

公开(公告)号：US20140010184A1

公开(公告)日：2014-01-09

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.

摘要翻译： 基站在覆盖区域内的多个OFDM子载波上与多个移动终端通信数据。 基站将第一频带内的多个OFDM子载波的第一组提供的传输资源分配给第一类型的移动终端，并且在第二频率内分配由多个OFDM子载波中的第二组提供的传输资源 频带到第二类型的终端，第二组小于第一组，第二频带从第一频带内选择。 基站在与OFDM子载波的组合的第一和第二组对应的第一带宽上发送包括第一类型的终端的资源分配信息的控制信息，并且在第二类中发送包括第二类型的终端的资源分配信息的控制信息 对应于第二组OFDM子载波的带宽。