公开(公告)号：US20100097963A1

公开(公告)日：2010-04-22

申请号：US12523134

申请日：2007-01-16

申请人： David Astely ,  Hannes Ekström ,  Alireza Nejatian ,  Per Skillermark ,  Tobias Tynderfeldt ,  Erik Westerberg

发明人： David Astely ,  Hannes Ekström ,  Alireza Nejatian ,  Per Skillermark ,  Tobias Tynderfeldt ,  Erik Westerberg

IPC分类号： H04J3/00

CPC分类号： H04W72/1231 ,  H04W52/267 ,  H04W56/003

摘要： The invention discloses a method (800) for use in a cellular wireless system (100) with a base station (120), a cell (110) in the system and a first user terminal (130) which can be scheduled for receiving traffic from the base station during a down link period, and for transmitting traffic to the base station during an up link period. There is a first guard period (TUD) between the up link period and the down link period, and a second guard period (TDU) between the down link period and the up link period. The method (800) comprises measuring the interference level in the cell for part of the time between two consecutive down link periods, and varying at least one of the following in accordance with the measured interference level: the duration of the first or second guard period, the duration of the up link period, or the traffic sent in the up link period.

摘要翻译： 本发明公开了一种在具有基站（120），系统中的小区（110）和第一用户终端（130）的蜂窝无线系统（100）中使用的方法（800），所述第一用户终端可被调度为从 在下行链路周期期间的基站，并且用于在上行链路周期期间向基站发送业务。 在上行链路周期和下行链路周期之间存在第一保护周期（TUD）和下行链路周期与上行链路周期之间的第二保护周期（TDU）。 方法（800）包括在两个连续的下行链路周期之间的部分时间内测量小区中的干扰电平，并且根据所测量的干扰电平来改变以下中的至少一个：第一或第二保护周期的持续时间 ，上行链路周期的持续时间，或在上行链路周期中发送的流量。

公开(公告)号：US09374115B2

公开(公告)日：2016-06-21

申请号：US14399222

申请日：2012-05-24

申请人： Youping Su ,  Alireza Nejatian ,  Fredrik Huss

发明人： Youping Su ,  Alireza Nejatian ,  Fredrik Huss

IPC分类号： H04B15/00 ,  H04B1/10 ,  H04B1/525

CPC分类号： H04B1/1027 ,  H04B1/525

摘要： A method in a base station is provided for reducing distortion of an uplink signal received in a receiver part (20) of the base station, said distortion being caused by intermodulation, IM, products. The method comprises: generating (106), from a transmitter source signal, a modeled signal of IM components, as nth order IM components of the transmitter source signal, n being an integer value of 2, 3, 4 and/or 5 etc., and detecting (110) IM products of the received uplink signal, the received uplink signal comprising UL traffic components and the IM products, by correlating the received uplink signal with the IM components of the modeled signal. The method further comprises producing (112) a cancellation signal based on the detected IM products of the received uplink signal, and subtracting (114) the cancellation signal from the received uplink signal. Also, a similar apparatus in a base station is provided.

摘要翻译： 提供了一种基站中的方法，用于减少在基站的接收机部分（20）中接收的上行链路信号的失真，所述失真是由互调，IM，乘积引起的。 该方法包括：从发射机源信号产生（106）IM分量的建模信号，作为发射机源信号的n阶IM分量，n是2,3,4和/或5等的整数值。 并且通过将接收到的上行链路信号与建模信号的IM分量相关联来检测（110）所接收的上行链路信号的IM产品，所接收的上行链路信号包括UL业务分量和IM产品。 该方法还包括基于检测到的接收到的上行链路信号的IM产物产生（112）消除信号，以及从接收到的上行链路信号中减去（114）消除信号。 此外，提供了基站中的类似装置。

公开(公告)号：US20150215887A1

公开(公告)日：2015-07-30

申请号：US14414203

申请日：2012-07-20

申请人： Alireza Nejatian ,  Muhammad Kazmi

发明人： Alireza Nejatian ,  Muhammad Kazmi

IPC分类号： H04W56/00 ,  H04B7/06

CPC分类号： H04W56/0045 ,  H04B7/0671 ,  H04W56/0055

摘要： Techniques for compensating for the time misalignment of receive-transmit switching in a multi-antenna radio network node are disclosed. An example method begins with the detection (1020) of signal transmission timing for each of two or more antennas associated with the radio network node, for at least a first transmission period. Next, the radio network node determines (1030) that transmit timing for at least one of the antennas is misaligned by at least a first threshold time interval, based on the detected signal transmission timings. The example method continues with the adjustment (1040) of transmit timing for at least one of the antennas for one or more subsequent transmission periods, responsive to determining that the transmission timing for at least one of the antennas is misaligned.

摘要翻译： 公开了用于补偿多天线无线电网络节点中的接收发射切换的时间偏移的技术。 至少在第一传输周期中，示例性方法开始于对于与无线电网络节点相关联的两个或多个天线中的每一个的信号传输定时的检测（1020）。 接下来，基于检测到的信号传输定时，无线电网络节点确定（1030）至少一个天线的发射定时不对准至少第一阈值时间间隔。 响应于确定至少一个天线的发射定时未对准，该示例方法继续对于一个或多个后续传输周期中的至少一个天线的发射定时的调整（1040）。

公开(公告)号：US08805284B2

公开(公告)日：2014-08-12

申请号：US13034467

申请日：2011-02-24

申请人： Alireza Nejatian ,  Krister Sundberg

发明人： Alireza Nejatian ,  Krister Sundberg

IPC分类号： H04B1/00 ,  H04B15/00

CPC分类号： H04W16/14 ,  H04W88/10

摘要： Interference in a wireless communication system receiver, such as at a base station, is identified based on monitoring automatic gain control (AGC) events. AGC statistics in combination with base band processing are used to identify the interference. Performance degradation is evaluated, and interference mitigation solutions are proposed based on the identified interference. Mitigation solutions include IRC, scheduling restrictions, and filter modifications including replacement of filters.

摘要翻译： 基于监控自动增益控制（AGC）事件来识别诸如在基站处的无线通信系统接收机中的干扰。 AGC统计与基带处理相结合，用于识别干扰。 评估性能下降，并根据所识别的干扰提出干扰减轻解决方案。 缓解解决方案包括IRC，调度限制和过滤器修改，包括更换过滤器。

公开(公告)号：US08755311B2

公开(公告)日：2014-06-17

申请号：US13127653

申请日：2008-11-17

申请人： Alireza Nejatian

发明人： Alireza Nejatian

IPC分类号： H04B7/005 ,  H04J3/00

CPC分类号： H04B17/10 ,  H04B17/21

摘要： An eNodeB in a TDD system (100), comprising first and second transmitters (408-411), a first receiver (302; 402-405), a control unit (306, 416), and means (305, 415) for diverting part of a transmitted signal from the first and second transmitters (408-411) to the first receiver (302; 402-405). The diverting means (305, 415) are connected to the transmitter part via a switch function (308, 418) and the transceiver also comprises a delay component (304, 404. The control unit (306, 416) activates the switch (308, 418) when the output power of the transmitted signals falls below a threshold, and the delay component (304, 404) delays so that the diverted signals are received by the receiver part (303; 402-405) at a predefined point in time. The transceiver (300) comprises a comparison unit (307, 417) for comparing the diverted signals from the first and second transmitters after reception through the first receiver.

摘要翻译： TDD系统（100）中的eNodeB，包括第一和第二发射机（408-411），第一接收机（302; 402-405），控制单元（306,416）和用于转发的装置（305,415） 来自第一和第二发射机（408-411）的传输信号的一部分到第一接收机（302; 402-405）。 转移装置（305,415）经由开关功能（308,418）连接到发射器部分，并且收发器还包括延迟部件（304,404）。控制单元（306,416）激活开关（308,404） 418），当所发送的信号的输出功率下降到阈值以下时，并且所述延迟分量（304,404）延迟，以便在预定的时间点由所述接收器部分（303; 402-405）接收所述转移的信号。 收发器（300）包括比较单元（307,417），用于在通过第一接收器接收之后比较来自第一和第二发射机的转发信号。

公开(公告)号：US08509122B2

公开(公告)日：2013-08-13

申请号：US12523134

申请日：2007-01-16

申请人： David Astely ,  Hannes Ekström ,  Alireza Nejatian ,  Per Skillermark ,  Tobias Tynderfeldt ,  Erik Lars Westerberg

发明人： David Astely ,  Hannes Ekström ,  Alireza Nejatian ,  Per Skillermark ,  Tobias Tynderfeldt ,  Erik Lars Westerberg

IPC分类号： H04L5/14 ,  H04J3/00 ,  H04J3/06 ,  H04L12/26 ,  H04L12/56

CPC分类号： H04W72/1231 ,  H04W52/267 ,  H04W56/003

摘要： The invention discloses a method (800) for use in a cellular wireless system (100) with a base station (120), a cell (110) in the system and a first user terminal (130) which can be scheduled for receiving traffic from the base station during a down link period, and for transmitting traffic to the base station during an up link period. There is a first guard period (TUD) between the up link period and the down link period, and a second guard period (TDU) between the down link period and the up link period. The method (800) comprises measuring the interference level in the cell for part of the time between two consecutive down link periods, and varying at least one of the following in accordance with the measured interference level: the duration of the first or second guard period, the duration of the up link period, or the traffic sent in the up link period.

摘要翻译： 本发明公开了一种在具有基站（120），系统中的小区（110）和第一用户终端（130）的蜂窝无线系统（100）中使用的方法（800），所述第一用户终端可被调度为从 在下行链路周期期间的基站，并且用于在上行链路周期期间向基站发送业务。 在上行链路周期和下行链路周期之间存在第一保护周期（TUD）和下行链路周期与上行链路周期之间的第二保护周期（TDU）。 方法（800）包括在两个连续的下行链路周期之间的部分时间内测量小区中的干扰电平，并且根据所测量的干扰电平来改变以下中的至少一个：第一或第二保护周期的持续时间 ，上行链路周期的持续时间，或在上行链路周期中发送的流量。

公开(公告)号：US20150111515A1

公开(公告)日：2015-04-23

申请号：US14399222

申请日：2012-05-24

申请人： Youping Su ,  Alireza Nejatian ,  Fredrik Huss

发明人： Youping Su ,  Alireza Nejatian ,  Fredrik Huss

IPC分类号： H04B1/10

CPC分类号： H04B1/1027 ,  H04B1/525

摘要： A method in a base station is provided for reducing distortion of an uplink signal received in a receiver part (20) of the base station, said distortion being caused by intermodulation, IM, products. The method comprises: generating (106), from a transmitter source signal, a modeled signal of IM components, as nth order IM components of the transmitter source signal, n being an integer value of 2, 3, 4 and/or 5 etc., and detecting (110) IM products of the received uplink signal, the received uplink signal comprising UL traffic components and the IM products, by correlating the received uplink signal with the IM components of the modeled signal. The method further comprises producing (112) a cancellation signal based on the detected IM products of the received uplink signal, and subtracting (114) the cancellation signal from the received uplink signal. Also, a similar apparatus in a base station is provided.

摘要翻译： 提供了一种基站中的方法，用于减少在基站的接收机部分（20）中接收的上行链路信号的失真，所述失真是由互调，IM，乘积引起的。 该方法包括：从发射机源信号产生（106）IM分量的建模信号，作为发射机源信号的n阶IM分量，n是2,3,4和/或5等的整数值。 并且通过将接收到的上行链路信号与建模信号的IM分量相关联来检测（110）所接收的上行链路信号的IM产品，所接收的上行链路信号包括UL业务分量和IM产品。 该方法还包括基于检测到的接收到的上行链路信号的IM产物产生（112）消除信号，以及从接收到的上行链路信号中减去（114）消除信号。 此外，提供了基站中的类似装置。

公开(公告)号：US20140355495A1

公开(公告)日：2014-12-04

申请号：US14366313

申请日：2011-12-21

申请人： Alireza Nejatian ,  Youp Su

发明人： Alireza Nejatian ,  Youp Su

IPC分类号： H04L5/14 ,  H04L12/26 ,  H04W24/02

CPC分类号： H04L5/14 ,  H04B1/0483 ,  H04B1/44 ,  H04L43/065 ,  H04W24/02

摘要： Method and radio node (500) for controlling a change of communication mode between transmit mode and receive mode according to a Time Division Duplex, TDD, scheme. The radio node has at least two parallel branches (504, 06) for transmission and reception of radio signals, wherein the branches currently operate in a first communication mode. The radio node obtains one or more indication signals (S1A, S1B) generated by one or more of the branches to indicate that the first mode has been turned off. When it is determined that the first communication mode has not been turned off in a faulty branch, e.g. by not receiving an indication signal in time from that branch,the first mode is disabled in the faulty branch, and/or the faulty branch is reported to a supervision centre (510). Thereby, it can be discovered when one of the branches is misaligned or otherwise faulty and suitable actions can be taken for repairing or replacing the faulty branch.

摘要翻译： 方法和无线电节点（500），用于根据时分双工TDD方案控制发射模式和接收模式之间的通信模式的改变。 无线电节点具有用于无线电信号的发送和接收的至少两个并行分支（504,06），其中分支当前以第一通信模式操作。 无线电节点获得由一个或多个分支产生的一个或多个指示信号（S1A，S1B），以指示第一模式已被关闭。 当确定在故障分支中没有关闭第一通信模式时，例如， 通过不从该分支在时间上接收到指示信号，故障分支中的第一模式被禁止，和/或故障分支被报告给监控中心（510）。 因此，当分支中的一个不对准或其他错误时可以发现，并且可以采取适当的动作来修复或更换故障分支。

公开(公告)号：US08144634B2

公开(公告)日：2012-03-27

申请号：US11948009

申请日：2007-11-30

申请人： Alireza Nejatian

发明人： Alireza Nejatian

IPC分类号： H04J3/00

CPC分类号： H04W52/52

摘要： In TDD mobile networks, an incoming signal is received during a time period where no uplink communication takes place. The incoming signal is measured and analyzed to determine a noise level. Based on the noise level and on an uplink signal level from expected in a future uplink time slot, a gain for the automatic gain controller is set for use in future uplink communications. The gain is set to optimize the operation of an analog-to-digital converter.

摘要翻译： 在TDD移动网络中，在不进行上行链路通信的时间段内接收到输入信号。 测量和分析输入信号以确定噪声电平。 基于噪声电平和在未来上行链路时隙中预期的上行链路信号电平，将自动增益控制器的增益设置为在将来的上行链路通信中使用。 增益被设置为优化模数转换器的操作。

公开(公告)号：US20080198775A1

公开(公告)日：2008-08-21

申请号：US11948009

申请日：2007-11-30

申请人： Alireza Nejatian

发明人： Alireza Nejatian

IPC分类号： H04J3/02

CPC分类号： H04W52/52

摘要： In TDD mobile networks, an incoming signal is received during a time period where no uplink communication takes place. The incoming signal is measured and analyzed to determine a noise level. Based on the noise level and on an uplink signal level from expected in a future uplink time slot, a gain for the automatic gain controller is set for use in future uplink communications. The gain is set to optimize the operation of an analog-to-digital converter.

摘要翻译： 在TDD移动网络中，在不进行上行链路通信的时间段内接收到输入信号。 测量和分析输入信号以确定噪声电平。 基于噪声电平和在未来上行链路时隙中预期的上行链路信号电平，将自动增益控制器的增益设置为在将来的上行链路通信中使用。 增益被设置为优化模数转换器的操作。