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    • 131. 发明授权
    • Methods and arrangements in a wireless communication system for producing signal structure with cyclic prefix
    • 用于产生具有循环前缀的信号结构的无线通信系统中的方法和布置
    • US08576932B2
    • 2013-11-05
    • US12997585
    • 2008-06-13
    • Peter LarssonHenrik Sahlin
    • Peter LarssonHenrik Sahlin
    • H04L27/28
    • H04L27/2607H04L1/0079H04L27/2662
    • The present invention relates to methods and arrangements in a wireless communication system supporting cyclic-prefix insertion, using a symbol sequence comprising a number of samples for transmission over a radio channel that enables the handling of very large signal delay spreads. The symbol sequence is built up by a first symbol with CP and a second symbol with CP. The second symbol is a copy of the first symbol with the samples shifted in a way that makes the two adjacent symbols with CP match in regards to the sample order. The symbol sequence may also comprise a third symbol with CP or more, where the third symbol is a copy of the second symbol and with the samples shifted in analogy with the symbol shift described above. The resulting symbol sequence will thus appear as an extended continuous symbol thanks to the precise cyclic shift that matches adjacent symbols. This allows the receiver to place its FFT window anywhere during the extended symbol, e.g. at the end of the symbol sequence thus making it possible to handle a delay spread longer than the CP duration. It also allows to place e.g. two FFT windows and to combine the extracted signal into one SNR improved signal, while still handling a longer delay spread.
    • 本发明涉及一种支持循环前缀插入的无线通信系统中的方法和装置,其使用包括多个样本的符号序列,以在能够处理非常大的信号延迟扩展的无线电信道上进行传输。 符号序列由具有CP的第一个符号和带有CP的第二个符号构成。 第二个符号是第一个符号的副本,其中样本以使得具有CP的两个相邻符号与样本顺序匹配的方式移位。 符号序列还可以包括具有CP或更多的第三符号,其中第三符号是第二符号的副本,并且样本类似于上述符号移位移位。 因此,由于符合相邻符号的精确循环移位,所得到的符号序列因此将显示为扩展的连续符号。 这允许接收机将其FFT窗口放置在扩展符号期间的任何地方。 因此在符号序列结束时,可以处理长于CP持续时间的延迟扩展。 它也允许放置例如。 两个FFT窗口,并将提取的信号组合成一个SNR改进的信号,同时仍处理更长的延迟扩展。
    • 133. 发明申请
    • System and Method for Retransmissions in a Wireless Communications System
    • 无线通信系统中的重传系统和方法
    • US20130148569A1
    • 2013-06-13
    • US13705494
    • 2012-12-05
    • Peter Larsson
    • Peter Larsson
    • H04B7/15
    • H04L1/1825H04B7/15H04L1/0026H04L1/0076H04L1/1607H04L1/1819H04L1/1838H04L1/1845H04L1/1848H04L1/20H04L1/22H04L2001/0097
    • A method (800) for a communications system (100, 300), with a sender (110), which transmits data as packets to a receiver (120). The receiver transmits (805) quality values to the sender representing the reception quality of packets received with errors. The receiver stores (810) information regarding a number of received data packets, and there is a relay transceiver (130) between the sender and the receiver. Both the relay transceiver and the sender can encode (820) data packets into composite packets, to transmit (825) composite packets to the receiver. Said stored information in the receiver (120) comprises the data in correctly received packets and information regarding the reception quality of packets received with errors and the data of those packets, and the stored information is used by the receiver to decode (835) composite packets, thereby extracting the data in the packets of the composite pockets.
    • 一种用于通信系统(100,300)的方法(800),其具有将数据作为分组发送到接收机(120)的发送器(110)。 接收机将发送(805)质量值发送到表示接收到的具有错误的分组的接收质量的发送者。 接收器存储(810)关于接收到的数据分组的数量的信息,并且在发送器和接收器之间存在中继收发器(130)。 中继收发器和发送器都可以将(820)数据分组编码为复合分组,以将(825)复合分组发送到接收机。 接收机(120)中的所述存储信息包括正确接收的分组中的数据和关于接收到的具有错误的分组的接收质量的信息和这些分组的数据,并且所存储的信息被接收机用于解码(835)复合分组 从而提取复合口袋的数据包中的数据。
    • 134. 发明申请
    • Reduced Power Consumption in a Wireless Communication System While Providing Adequate Directional Radio Coverage
    • 在提供充足的定向无线电覆盖的同时,在无线通信系统中降低功耗
    • US20130050053A1
    • 2013-02-28
    • US13695361
    • 2010-05-21
    • Peter Larsson
    • Peter Larsson
    • H01Q3/24
    • H04B7/0671H04B7/0689H04W52/0206Y02D70/444
    • There is provided an arrangement for a wireless communication system that includes a set of power amplifiers (10-1, 10-2, 10-3) and a set of antennas (20-1, 20-2, 20-3) based on which at least two different configurations are provided, including a first configuration (1) of power amplifiers and antennas and a second configuration (2) of power amplifier(s) and antennas. The arrangement also includes switching circuitry (40) configured to switch between the configurations. The second configuration employs a smaller number of power amplifiers than the first configuration, and the second configuration has fewer power amplifiers than antennas where at least one power amplifier is connected to at least two antennas via respective antenna branches that are configured with different delays, as represented by delay elements (30-1, 30-2). A difference in delay between a pair of these antenna branches is based on a measure representative of the inverse bandwidth of a signal to be transmitted through the antennas.
    • 提供了一种用于无线通信系统的装置,其包括一组功率放大器(10-1,10-2,10-3)和一组天线(20-1,20-2,20-3),其基于 其提供至少两种不同的配置,包括功率放大器和天线的第一配置(1)和功率放大器和天线的第二配置(2)。 该装置还包括被配置为在配置之间切换的切换电路(40)。 第二种配置采用比第一种配置更少数量的功率放大器,并且第二配置具有比天线更少的功率放大器,其中至少一个功率放大器经由配置有不同延迟的相应天线分支连接到至少两个天线,如 由延迟元件(30-1,30-2)表示。 一对这些天线分支之间的延迟差基于表示要通过天线发送的信号的反向带宽的度量。
    • 135. 发明授权
    • Systems and method for canceling feedback interference
    • 消除反馈干扰的系统和方法
    • US08385820B2
    • 2013-02-26
    • US13144049
    • 2009-01-12
    • Peter LarssonJiansong Gan
    • Peter LarssonJiansong Gan
    • H04B7/14
    • H04B7/15585H04B7/0617H04B7/0619
    • The present application discloses systems and methods for reducing output-to-input feedback signal interference caused by a forwarding node that is configured to forward information received from a transmitter. In some embodiments, this output-to-input feedback signal interference is compensated for by the transmitter. For example, the transmitter is configured such that the signal that is transmitted by transmitter to the forwarding node includes both (1) a primary signal or ‘desired’ signal (e.g., the signal that is intended for a receiving device) and (2) a filtered version of the primary signal. The filter that produces the filtered version of the primary signal is configured (e.g., the filter's filter weights are adapted) such that the filtered version of the primary signal cancels or reduces the undesired output-to-input feedback signal.
    • 本申请公开了用于减少由转发节点引起的输出到输入反馈信号的系统和方法,该转发节点被配置为转发从发射机接收的信息。 在一些实施例中,该输出到输入的反馈信号干扰由发射机补偿。 例如,发射机被配置为使得由发射机发送到转发节点的信号包括(1)主信号或期望信号(例如,用于接收设备的信号)和(2)经滤波的 版本的主要信号。 配置产生主信号的滤波版本的滤波器(例如,滤波器的滤波器权重被适配),使得主信号的滤波版本抵消或减少不期望的输出到输入反馈信号。
    • 136. 发明授权
    • System and method for retransmissions in a wireless communications system
    • 用于无线通信系统中的重传的系统和方法
    • US08381061B2
    • 2013-02-19
    • US12530301
    • 2008-03-06
    • Peter Larsson
    • Peter Larsson
    • G08C25/02H04L1/18H04L1/14H03M13/00
    • H04L1/1825H04B7/15H04L1/0026H04L1/0076H04L1/1607H04L1/1819H04L1/1838H04L1/1845H04L1/1848H04L1/20H04L1/22H04L2001/0097
    • A sender for a communications system transmits data as packets to a receiver. The receiver transmits quality values to the sender representing the reception quality of packets received with errors. The receiver stores information regarding a number of received data packets, and there is a relay transceiver between the sender and the receiver. Both the relay transceiver and the sender can encode data packets into composite packets, and to transmit composite packets to the receiver. The stored information in the receiver comprises the data in correctly received packets and information regarding the reception quality of packets received with errors and the data of those packets, and the stored information is used by the receiver to decode composite packets, thereby extracting the data in the packets of the composite packets.
    • 通信系统的发送者将数据作为数据包发送到接收机。 接收机向发送者发送质量值,表示接收到的分组的接收质量。 接收器存储关于多个接收到的数据分组的信息,并且在发送器和接收器之间存在中继收发器。 中继收发器和发送器都可以将数据包编码为复合数据包,并将复合数据包发送到接收器。 接收机中存储的信息包括正确接收的分组中的数据和关于接收到的具有错误的分组的接收质量的信息和这些分组的数据,并且所存储的信息被接收机用于对复合分组进行解码,从而提取数据 复合报文的报文。
    • 137. 发明授权
    • Reliable multicast with linearly independent data packet coding
    • 具有线性独立数据包编码的可靠多播
    • US08250426B2
    • 2012-08-21
    • US12515924
    • 2006-11-29
    • Peter Larsson
    • Peter Larsson
    • H04L1/18
    • H04L1/1887H04L1/1845H04L5/0044H04L5/0058H04L12/1868H04L2001/0093
    • Regular data packets are scheduled for transmission from a sender to multiple receivers in a multicast ARQ system. In a joint scheduling and encoding procedure, a composite data packet is formed as a weighted linear combination of regular data packets. The corresponding coding weights are adapted based on feedback information from the receivers about received data packets such the composite packet represents a new linearly independent coding of regular data packets different from any multicast data packet previously received each receiver in a selected set of the receivers during the multicast session. In addition, using a weight vector with at least two different non-zero coding weights adds a further degree of freedom and guarantees the ability to always form a composite data packet that represents a new linearly independent coding for transmission. The ability to transmit linearly independent data packets in at least a majority of the transmission instances will significantly improve the throughput performance for reliable multicasting, especially when the number of users is large.
    • 定期数据包被安排在组播ARQ系统中从发送方发送到多个接收者。 在联合调度和编码过程中,形成复合数据分组作为常规数据分组的加权线性组合。 相应的编码权重基于来自接收机的关于接收到的数据分组的反馈信息进行调整,使得该复合分组表示在所选择的一组接收机期间先前接收到每个接收机的接收机中的任何多播数据分组不同的常规数据分组的新的线性独立编码 多播会话。 另外,使用具有至少两个不同的非零编码权重的加权向量增加了进一步的自由度,并保证了总是形成代表用于传输的新的线性独立编码的复合数据分组的能力。 在至少大部分传输实例中传输线性独立数据包的能力将显着提高可靠多播的吞吐量性能,特别是当用户数量较大时。
    • 138. 发明授权
    • Method and arrangement for link cost determination for routing in wireless networks
    • 无线网络中路由的链路成本确定的方法和布置
    • US08159955B2
    • 2012-04-17
    • US12065646
    • 2005-10-12
    • Peter Larsson
    • Peter Larsson
    • G01R31/08
    • H04W40/16H04L45/123Y02D70/142Y02D70/22Y02D70/34
    • The invention relates to determination of a link cost employable in route determination and data forwarding in a multihop communication network (1). This link cost is adapted to the particular characteristics of wireless contention-based networks (1), in which both network nodes (10, 20) involved in node-to-node data forwarding block neighbor nodes (30, 40, 50) that have to defer medium access during the data forwarding. The link cost is determined based on the estimated total number of nodes (30, 40, 50) that are blocked if data is forwarded on a wireless link (12) from a node (10) to another node (20). The link cost may also be based on a per bit normalized expected transmit duration for the data forwarding in combination with said estimated number of nodes. Usage of the link cost in route determination minimizes the number of truly blocked nodes in the network (1) and increased the network capacity.
    • 本发明涉及确定在多跳通信网络(1)中的路由确定和数据转发中可使用的链路成本。 该链路成本适应于基于无线竞争的网络(1)的特定特征,其中参与节点到节点数据转发的相邻节点(30,40,50)中的两个网络节点(10,20)具有 在数据转发期间推迟媒体访问。 如果数据在无线链路(12)上从节点(10)转发到另一个节点(20),则基于估计的节点总数(30,40,50)来确定链路成本。 链路成本还可以基于与所述估计的节点数相结合的数据转发的每位归一化的预期发送持续时间。 在路由确定中使用链路成本可以最大限度地减少网络中真实阻塞的节点数量(1),增加网络容量。
    • 140. 发明申请
    • Systems and Method for Canceling Feedback Interference
    • 取消反馈干扰的系统和方法
    • US20110269395A1
    • 2011-11-03
    • US13144049
    • 2009-01-12
    • Peter LarssonJiansong Gan
    • Peter LarssonJiansong Gan
    • H04B7/14
    • H04B7/15585H04B7/0617H04B7/0619
    • The present application discloses systems and methods for reducing output-to-input feedback signal interference caused by a forwarding node that is configured to forward information received from a transmitter. In some embodiments, this output-to-input feedback signal interference is compensated for by the transmitter. For example, the transmitter is configured such that the signal that is transmitted by transmitter to the forwarding node includes both (1) a primary signal or ‘desired’ signal (e.g., the signal that is intended for a receiving device) and (2) a filtered version of the primary signal. The filter that produces the filtered version of the primary signal is configured (e.g., the filter's filter weights are adapted) such that the filtered version of the primary signal cancels or reduces the undesired output-to-input feedback signal.
    • 本申请公开了用于减少由转发节点引起的输出到输入反馈信号的系统和方法,该转发节点被配置为转发从发射机接收的信息。 在一些实施例中,该输出到输入的反馈信号干扰由发射机补偿。 例如,发射机被配置为使得由发射机发送到转发节点的信号包括(1)主信号或“期望”信号(例如,用于接收设备的信号)和(2) 主要信号的滤波版本。 配置产生主信号的滤波版本的滤波器(例如,滤波器的滤波器权重被适配),使得主信号的滤波版本抵消或减少不期望的输出到输入反馈信号。