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    • 1. 发明申请
    • DISTRIBUTED CO-OPERATING NODES USING TIME REVERSAL
    • 使用时间反转的分销合作伙伴
    • WO2012151316A1
    • 2012-11-08
    • PCT/US2012/036180
    • 2012-05-02
    • ZIVA CORPORATIONHUSAIN, AnisRODE, JeremySMITH, DavidHSU, MarkACHOUR, Maha
    • HUSAIN, AnisRODE, JeremySMITH, DavidHSU, MarkACHOUR, Maha
    • H04W88/08
    • H04W56/0065H04B7/024H04J3/0638H04J3/0682H04W56/001H04W56/0015H04W56/0025H04W84/18
    • Methods and systems for coherent distributed communication techniques using time reversal are disclosed. In one aspect, cooperating nodes of a cluster can move relative to each other and relative to an intended receiver of the nodes' data transmissions. The nodes are synchronized to a common time reference, and data for transmission from the cluster is distributed to the nodes. The intended receiver sends a sounding signal to the nodes. Each node receives the sounding signal, obtains the channel response between the intended receiver and itself, and time-reverses the channel response. Each node then convolves its time-reversed channel response with the data, to obtain the node's convolved data. Each node waits a predetermined time following the time reference signal, as determined based on the common time reference. At the expiration of the predetermined time period, the nodes simultaneously transmit their convolved data.
    • 公开了使用时间反转的相干分布式通信技术的方法和系统。 在一个方面,集群的协作节点可以相对于彼此并相对于节点的数据传输的预期接收器移动。 节点被同步到公共时间参考,并且用于从集群传输的数据被分发到节点。 预期的接收器向节点发送一个探测信号。 每个节点接收探测信号,获得目标接收机与其本身之间的信道响应,并对信道响应进行时间反向。 然后每个节点将其时间反转的信道响应与数据进行卷积,以获得节点的卷积数据。 每个节点等待基于公共时间基准确定的时间参考信号之后的预定时间。 在预定时间段到期时,节点同时发送它们的卷积数据。
    • 2. 发明申请
    • TIME REVERSAL IN WIRELESS COMMUNICATIONS
    • 无线通信时间反转
    • WO2016137898A1
    • 2016-09-01
    • PCT/US2016/018968
    • 2016-02-22
    • RODE, JeremyHSU, MarkACHOUR, MahaSMITH, DavidHUSAIN, AnisZIVA CORPORATION
    • RODE, JeremyHSU, MarkACHOUR, MahaSMITH, DavidHUSAIN, Anis
    • H04L23/02H04H40/72H04H20/34
    • H04L27/2634H04L23/02H04L25/0212H04L25/03343
    • In examples, Time-Reversal (TR) Orthogonal Frequency-Division Multiplexing (OFDM) communications employ adaptive filtering on a per-subcarrier basis. Matched filtering is used for subcarriers with poor transmission properties (such as relatively high channel attenuation), while inverse filtering is used for subcarriers with relatively good transmission properties (such as relatively low channel attenuation). Modulation order may be reduced for the subcarriers with poor properties (relative to the subcarriers with good properties). The discovery of subcarrier properties may be performed through the channel state information measured and reconciled from single- and/or bi-directional TR sounding signals. The discovery may be repeated, for example, performed continually. In response to changes in traffic and other environmental conditions, the system may be reconfigured dynamically with different subcarriers selected for matched and inverse filtering. In examples, a normalized signal-to-noise ratio threshold dividing good and poor transmission properties is computed based on an acceptable symbol error rate.
    • 在实例中,时间反演(TR)正交频分复用(OFDM)通信在每个子载波的基础上采用自适应滤波。 匹配滤波用于传输性能差(例如相对较高的信道衰减)的子载波,而反向滤波用于具有相对较好传输特性(例如相对低的信道衰减)的副载波。 对于具有不良特性(相对于具有良好性质的子载波)的子载波,可以减小调制顺序。 子载波属性的发现可以通过从单和/或双向TR探测信号测量和协调的信道状态信息来执行。 可以重复发现,例如,连续执行。 响应于业务和其他环境条件的变化,系统可以用不同的子载波动态地重新配置,用于匹配和反向过滤。 在示例中,基于可接受的符号错误率来计算分割良好和差的传输性质的归一化信噪比阈值。