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    • 30. 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。