公开(公告)号：US08331467B2

公开(公告)日：2012-12-11

申请号：US12461420

申请日：2009-08-11

申请人： Afif Osseiran ,  Andrew Logothetis

发明人： Afif Osseiran ,  Andrew Logothetis

IPC分类号： H04L27/28

CPC分类号： H04L25/0242 ,  H04L1/0625 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0224 ,  H04L25/0226 ,  H04L25/0232 ,  H04L25/025

摘要： A radio channel estimation technique is described for use in a OFDM-based radio communications system. A block of OFDM symbols is transmitted from multiple antennas over multiple sub-carrier frequencies. The block of OFDM symbols includes known pilot symbols as well as data symbols to be determined by a receiver. The pilot symbols are transmitted in a predetermined pattern at periodic times on periodic sub-carriers. A pilot channel estimate is determined for each pilot symbol in the received block of OFDM symbols. An N×M matrix of points corresponding to the received OFDM symbol block is formed. N is the number of sub-carriers and M is the number of OFDM symbols in the OFDM symbol block. The matrix is formed by inserting pilot channel estimates at predetermined positions in the N×M matrix according to the predetermined pilot pattern and inserting zeros in remaining positions in the N×M matrix. A two dimensional inverse Fourier transform of the N×M matrix is calculated resulting in multiple copies of a channel estimate in the time domain. One is selected, and a two dimensional Fourier transform of the selected channel estimate is calculated to obtain a channel estimate at each point in the OFDM block.

公开(公告)号：US20050064872A1

公开(公告)日：2005-03-24

申请号：US10668363

申请日：2003-09-24

申请人： Afif Osseiran ,  Andrew Logothetis ,  Marten Ericson

发明人： Afif Osseiran ,  Andrew Logothetis ,  Marten Ericson

IPC分类号： H04B7/04 ,  H04B7/06 ,  H04L12/56 ,  H04W16/28 ,  H04W72/08 ,  H04W72/12 ,  H04Q7/20

CPC分类号： H04W72/1231 ,  H04B7/0408 ,  H04B7/0617 ,  H04B7/0619 ,  H04W16/28

摘要： A radio base station includes multiple antennas associated with a cell. Multiple mobile radios are selected to receive transmissions over a shared radio channel during a predetermined time interval. Information is transmitted over the shared radio channel to multiple mobile radios in the cell during the predetermined time interval using multiple antenna beams. As a result, interference from the transmission appears as white additive Gaussian noise in time and in space in the cell. A “flashlight effect” caused by a single beam transmission over the shared channel during a predetermined time interval that would normally detrimentally impact mobile channel quality detection is avoided. Other methods for avoiding the flashlight effect are described.

摘要翻译： 无线电基站包括与小区相关联的多个天线。 多个移动无线电被选择以在预定的时间间隔期间通过共享无线电信道接收传输。 信息通过共享无线电信道在预定时间间隔内使用多个天线波束在小区中的多个移动无线电发射。 结果，来自传输的干扰在时间和空间中表现为白色加性高斯噪声。 避免了在通常不利地影响移动信道质量检测的预定时间间隔期间通过共享信道上的单个波束传输引起的“手电筒效应”。 描述了避免手电筒效应的其他方法。

公开(公告)号：US08081721B2

公开(公告)日：2011-12-20

申请号：US11730003

申请日：2007-03-29

申请人： Afif Osseiran ,  Andrew Logothetis

发明人： Afif Osseiran ,  Andrew Logothetis

IPC分类号： H04B7/10

CPC分类号： H04B7/208 ,  H04B7/026 ,  H04L5/0023 ,  H04L27/2607 ,  H04L27/2628 ,  H04L27/265

摘要： A wireless communication system uses relaying to enhance performance. Artificial frequency selectivity and spatial diversity are provided by introducing delay diversity. A transformed OFDM chunk is subjected to a 2D cyclic prefix by pre-appending to a representation of the chunk the last column of the representation and by copying a number of the last rows of the pre-appended chunk to the top of the representation thereby forming an augmented OFDM chunk.

摘要翻译： 无线通信系统使用中继来提高性能。 通过引入延迟分集来提供人工频率选择性和空间分集。 通过预先附加到组块表示的最后一列并通过将预先附加的组块的最后一行的数目复制到表示的顶部，将变换的OFDM组块经受2D循环前缀，从而形成 增强的OFDM块。

公开(公告)号：US07437166B2

公开(公告)日：2008-10-14

申请号：US10668363

申请日：2003-09-24

申请人： Afif Osseiran ,  Andrew Logothetis ,  Marten Ericson

发明人： Afif Osseiran ,  Andrew Logothetis ,  Marten Ericson

IPC分类号： H04Q7/20

CPC分类号： H04W72/1231 ,  H04B7/0408 ,  H04B7/0617 ,  H04B7/0619 ,  H04W16/28

摘要： A radio base station includes multiple antennas associated with a cell. Multiple mobile radios are selected to receive transmissions over a shared radio channel during a predetermined time interval. Information is transmitted over the shared radio channel to multiple mobile radios in the cell during the predetermined time interval using multiple antenna beams. As a result, interference from the transmission appears as white additive Gaussian noise in time and in space in the cell. A “flashlight effect” caused by a single beam transmission over the shared channel during a predetermined time interval that would normally detrimentally impact mobile channel quality detection is avoided. Other methods for avoiding the flashlight effect are described.

摘要翻译： 无线电基站包括与小区相关联的多个天线。 多个移动无线电被选择以在预定的时间间隔期间通过共享无线电信道接收传输。 信息通过共享无线电信道在预定时间间隔内使用多个天线波束在小区中的多个移动无线电发射。 结果，来自传输的干扰在时间和空间中表现为白色加性高斯噪声。 避免了在通常不利地影响移动信道质量检测的预定时间间隔期间通过共享信道上的单个波束传输引起的“手电筒效应”。 描述了避免手电筒效应的其他方法。

公开(公告)号：US20060280114A1

公开(公告)日：2006-12-14

申请号：US11418455

申请日：2006-05-05

申请人： Afif Osseiran ,  Andrew Logothetis

发明人： Afif Osseiran ,  Andrew Logothetis

IPC分类号： H04J11/00

CPC分类号： H04L25/0242 ,  H04L1/0625 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0224 ,  H04L25/0226 ,  H04L25/0232 ,  H04L25/025

摘要： A radio channel estimation technique is described for use in a OFDM-based radio communications system. A block of OFDM symbols is transmitted from multiple antennas over multiple sub-carrier frequencies. The block of OFDM symbols includes known pilot symbols as well as data symbols to be determined by a receiver. The pilot symbols are transmitted in a predetermined pattern at periodic times on periodic sub-carriers. A pilot channel estimate is determined for each pilot symbol in the received block of OFDM symbols. An N×M matrix of points corresponding to the received OFDM symbol block is formed. N is the number of sub-carriers and M is the number of OFDM symbols in the OFDM symbol block. The matrix is formed by inserting pilot channel estimates at predetermined positions in the N×M matrix according to the predetermined pilot pattern and inserting zeros in remaining positions in the N×M matrix. A two dimensional inverse Fourier transform of the N×M matrix is calculated resulting in multiple copies of a channel estimate in the time domain. One is selected, and a two dimensional Fourier transform of the selected channel estimate is calculated to obtain a channel estimate at each point in the OFDM block.

摘要翻译： 描述了用于基于OFDM的无线电通信系统中的无线电信道估计技术。 OFDM符号块通过多个子载波频率从多个天线发送。 OFDM符号的块包括已知的导频符号以及由接收机确定的数据符号。 在周期性子载波上周期性地以预定模式发送导频符号。 对OFDM符号的接收块中的每个导频符号确定导频信道估计。 形成与接收的OFDM符号块相对应的点的 Nx M个矩阵。 N 是子载波的数量，并且 M 是OFDM符号块中的OFDM符号的数量。 通过根据预定导频模式在 NxM 矩阵中的预定位置处插入导频信道估计并将零插入到 NxM 矩阵中的剩余位置中来形成矩阵。 计算 NxM 矩阵的二维傅里叶逆变换，得到时域中的信道估计的多个拷贝。 选择一个，并且计算所选择的信道估计的二维傅里叶变换，以在OFDM块中的每个点处获得信道估计。

公开(公告)号：US08126066B2

公开(公告)日：2012-02-28

申请号：US11418455

申请日：2006-05-05

申请人： Afif Osseiran ,  Andrew Logothetis

发明人： Afif Osseiran ,  Andrew Logothetis

IPC分类号： H04L27/28

CPC分类号： H04L25/0242 ,  H04L1/0625 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0224 ,  H04L25/0226 ,  H04L25/0232 ,  H04L25/025

摘要： A radio channel estimation technique is described for use in a OFDM-based radio communications system. A block of OFDM symbols is transmitted from multiple antennas over multiple sub-carrier frequencies. The block of OFDM symbols includes known pilot symbols as well as data symbols to be determined by a receiver. The pilot symbols are transmitted in a predetermined pattern at periodic times on periodic sub-carriers. A pilot channel estimate is determined for each pilot symbol in the received block of OFDM symbols. An N×M matrix of points corresponding to the received OFDM symbol block is formed. N is the number of sub-carriers and M is the number of OFDM symbols in the OFDM symbol block. The matrix is formed by inserting pilot channel estimates at predetermined positions in the N×M matrix according to the predetermined pilot pattern and inserting zeros in remaining positions in the N×M matrix. A two dimensional inverse Fourier transform of the N×M matrix is calculated resulting in multiple copies of a channel estimate in the time domain. One is selected, and a two dimensional Fourier transform of the selected channel estimate is calculated to obtain a channel estimate at each point in the OFDM block.

摘要翻译： 描述了用于基于OFDM的无线电通信系统中的无线电信道估计技术。 OFDM符号块通过多个子载波频率从多个天线发送。 OFDM符号的块包括已知的导频符号以及由接收机确定的数据符号。 在周期性子载波上周期性地以预定模式发送导频符号。 对OFDM符号的接收块中的每个导频符号确定导频信道估计。 形成与接收的OFDM符号块对应的N×M个矩阵。 N是子载波的数量，M是OFDM符号块中的OFDM符号的数量。 通过根据预定导频模式在N×M矩阵中的预定位置处插入导频信道估计并将零插入N×M矩阵中的剩余位置来形成矩阵。 计算N×M矩阵的二维傅里叶逆变换，得到时域中的信道估计的多个拷贝。 选择一个，并且计算所选择的信道估计的二维傅里叶变换，以在OFDM块中的每个点处获得信道估计。

公开(公告)号：US20110058630A1

公开(公告)日：2011-03-10

申请号：US12947452

申请日：2010-11-16

申请人： Afif OSSEIRAN ,  Andrew Logothetis

发明人： Afif OSSEIRAN ,  Andrew Logothetis

IPC分类号： H04L27/00

CPC分类号： H04B7/208 ,  H04B7/026 ,  H04L5/0023 ,  H04L27/2607 ,  H04L27/2628 ,  H04L27/265

摘要： A wireless communication system with relaying to enhance performance provides artificial frequency selectivity and spatial diversity by introducing delay diversity. A OFDM chunk is subjected to a 2D cyclic prefix by pre-appending to a representation of the chunk the last column of the representation. The last row of the pre-appended chunk is copied to the top of the augmented chunk forming an augmented chunk.

摘要翻译： 具有中继以增强性能的无线通信系统通过引入延迟分集来提供人工频率选择性和空间分集。 通过预先附加到表示的最后一列的块的表示来对OFDM块进行二维循环前缀。 预先附加的块的最后一行被复制到扩展块的顶部，形成扩充的块。

公开(公告)号：US20070230605A1

公开(公告)日：2007-10-04

申请号：US11730003

申请日：2007-03-29

申请人： Afif Osseiran ,  Andrew Logothetis

发明人： Afif Osseiran ,  Andrew Logothetis

IPC分类号： H04K1/10

CPC分类号： H04B7/208 ,  H04B7/026 ,  H04L5/0023 ,  H04L27/2607 ,  H04L27/2628 ,  H04L27/265

摘要： The present invention relates to wireless communication systems wherein relaying is used to enhance performance. According to the method and arrangement of the invention artificial frequency selectivity and spatial diversity is provided by introducing delay diversity. A OFDM chunk is subjected to a 2D cyclic prefix by pre-appending to a representation of the chunk the last column of the representation. The last rows of the pre-appended chunk is copied to the top of the augmented chunk forming an augmented chunk.

摘要翻译： 本发明涉及使用中继来增强性能的无线通信系统。 根据本发明的方法和布置，通过引入延迟分集来提供人工频率选择性和空间分集。 通过预先附加到表示的最后一列的块的表示来对OFDM块进行二维循环前缀。 预先附加的块的最后一行被复制到形成扩充块的扩充块的顶部。

公开(公告)号：US20120082061A1

公开(公告)日：2012-04-05

申请号：US13218744

申请日：2011-08-26

申请人： Martin Lysejko ,  Andrew Logothetis

发明人： Martin Lysejko ,  Andrew Logothetis

IPC分类号： H04W16/18

CPC分类号： H04W72/1205 ,  H04B7/0413 ,  H04L5/0073 ,  H04W24/02 ,  H04W88/085 ,  H04W92/20

摘要： An apparatus and method are provided for controlling a wireless feeder network which connects access base stations to a communications network. The wireless feeder network comprises a plurality of feeder base stations connected to the communications network and a plurality of feeder terminals connected to the plurality of access base stations. A sounding schedule is determined for the wireless feeder network in dependence on a visibility matrix, the visibility matrix indicative of visibility via the wireless feeder network between each of the plurality of feeder base stations and each of the plurality of feeder terminals. Then a sounding procedure within the wireless feeder network is controlled in accordance with the sounding schedule. The visibility matrix enables a coordinated sounding procedure to be carried out, allowing more accurate channel metrics for the wireless channels of the network to be determined which are not adversely affected by interference between elements of the network.

摘要翻译： 提供了一种用于控制将接入基站连接到通信网络的无线馈线网络的装置和方法。 无线馈线网络包括连接到通信网络的多个馈线基站和连接到多个接入基站的多个馈线终端。 根据可见矩阵确定无线馈线网络的探测计划，可视矩阵表示多个馈线基站中的每一个与多个馈线终端中的每一个之间经由无线馈线网络的可见性的可见性矩阵。 然后根据探测时间表控制无线馈线网络内的探测过程。 可见性矩阵使得能够执行协调的探测过程，从而允许确定网络的无线信道的更准确的信道度量，其不受网络元件之间的干扰的不利影响。

公开(公告)号：US07664533B2

公开(公告)日：2010-02-16

申请号：US10704158

申请日：2003-11-10

申请人： Andrew Logothetis ,  David Astely

发明人： Andrew Logothetis ,  David Astely

IPC分类号： H04M1/00

CPC分类号： H01Q3/2605 ,  H01Q1/246 ,  H01Q3/40 ,  H01Q25/002

摘要： An antenna array in a radio node includes multiple antenna elements for transmitting a wider beam covering a majority of a sector cell that includes a common signal and a narrower beam covering only a part of the sector cell that includes a mobile user-specific signal. Transmitting circuitry is coupled to the antenna array, and processing circuitry is coupled to the transmitting circuitry. The processing circuitry ensures the user-specific signal and the common signal in a mixed beam embodiment are in-phase and time-aligned at the antenna array. In a steered beam embodiment, the processing circuitry ensures the user-specific signal and the common signal are time-aligned and have a controlled phase difference when received at mobile stations in the sector cell. In both embodiments, distortions in the common signal and the user-specific signal associated with their conversion from baseband frequency to radio frequency are also compensated. And in the steered beam embodiment, beam forming weights are used not only to radiate a narrower beam to the desired mobile user but also to direct a wider common signal beam to reach all mobile users in the cell.

摘要翻译： 无线电节点中的天线阵列包括多个天线元件，用于发射覆盖包括公共信号的扇区小区的大部分的较宽波束，以及仅覆盖包括移动用户专用信号的扇区小区的一部分的较窄波束。 发射电路耦合到天线阵列，并且处理电路耦合到发射电路。 处理电路确保混合波束实施例中的用户特定信号和公共信号在天线阵列处是同相和时间对准的。 在转向光束实施例中，处理电路确保用户特定信号和公共信号是时间对准的，并且在扇区小区中的移动台处接收时具有受控的相位差。 在这两个实施例中，公共信号的失真以及与从基带频率到射频的转换相关联的用户特定信号也被补偿。 并且在转向束实施例中，波束形成权重不仅用于将较窄的波束辐射到期望的移动用户，而且还用于引导较宽的公共信号波束以到达小区中的所有移动用户。