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    • 11. 发明授权
    • Method and measurement configuration for measuring the characteristics of radio channels
    • 测量无线电频道特性的方法和测量配置
    • US06311043B1
    • 2001-10-30
    • US09588936
    • 2000-06-05
    • Martin HaardtChristopher Brunner
    • Martin HaardtChristopher Brunner
    • H04B1700
    • H04B7/0854
    • The characteristics of radio channels are measured. The signals received by a plurality Mc of receiving sensors of a two-dimensional antenna array are composed of wave elements of a transmission signal with regard to the azimuth and the elevation of a different two-dimensional incidence direction and different delay. The transmission signal contains a preselected test sequence, and the incidence angle as well as the delay of the dominant wave fronts are estimated simultaneously taking account of the chip signal form of the test sequence. The signals of each antenna sensor are demodulated, and sampling is then carried out with Mc samples per chip in the test sequence. The resultant samples are transformed to the frequency domain by discrete Fourier transformation, and the resultant values are corrected taking account of the spectrum of the chip signal form, wherein the line vectors formed from the values obtained for each sensor can be combined to form a data matrix XF, which contains invariances that characterize the channel in the space/frequency domain.
    • 测量无线电信道的特性。 由二维天线阵列的接收传感器的多个Mc接收的信号由关于不同二维入射方向和不同延迟的方位角和仰角的传输信号的波形元素组成。 传输信号包含预选的测试序列,并且考虑到测试序列的芯片信号形式,同时估计主波前的入射角以及延迟。 每个天线传感器的信号被解调,然后在测试序列中用每个芯片的Mc采样进行采样。 通过离散傅里叶变换将得到的样本变换到频域,并且考虑到芯片信号形式的频谱来校正所得到的值,其中由每个传感器获得的值形成的线向量可以被组合以形成数据 矩阵XF,其包含表征空间/频域中的信道的不变性。
    • 13. 发明授权
    • Mapping wireless signals with motion sensors
    • 用运动传感器映射无线信号
    • US08633817B2
    • 2014-01-21
    • US12851458
    • 2010-08-05
    • Behrooz KhorashadiSaumitra Mohan DasVinay SridharaAlok AggarwalChristopher Brunner
    • Behrooz KhorashadiSaumitra Mohan DasVinay SridharaAlok AggarwalChristopher Brunner
    • G08B1/08
    • G01S5/0252
    • A displacement device for mapping wireless signal fingerprints includes motion sensors and at least one of a received signal strength indicator (RSSI) sensor and a round trip time (RTT) sensor. The motion sensors may include a pedometer and one or more sensors to receive turn information. The start position of the displacement device is initialized and as the displacement device is moved through an environment, the position of each measurement location is determined using the initialized position and data from the motion sensors. The measurement position along with the RSSI and/or RTT measurement is stored in a database, from which a map can be generated. The position of the access point may be determined using the RSSI measurement or RTT measurement. Additionally, accumulated errors in the measurement position may be monitored and when greater than a threshold, a user may be prompted to reinitialize the position of the displacement device.
    • 用于映射无线信号指纹的位移设备包括运动传感器和接收信号强度指示器(RSSI)传感器和往返时间(RTT)传感器中的至少一个。 运动传感器可以包括计步器和用于接收转向信息的一个或多个传感器。 位移装置的起始位置被初始化,并且当位移装置移动通过环境时,使用来自运动传感器的初始化位置和数据来确定每个测量位置的位置。 测量位置与RSSI和/或RTT测量一起存储在数据库中,从中可以生成映射。 可以使用RSSI测量或RTT测量来确定接入点的位置。 此外,可以监视测量位置中的累积误差,并且当大于阈值时,可以提示用户重新初始化位移装置的位置。
    • 20. 发明授权
    • Receiver and method of recovering data from radio signals
    • 从无线电信号恢复数据的接收机和方法
    • US06567462B1
    • 2003-05-20
    • US09360486
    • 1999-07-23
    • Christopher BrunnerMartin Haardt
    • Christopher BrunnerMartin Haardt
    • H04B169
    • H04B1/707H04B7/0854H04B2201/70701
    • A receiver that operates to recover data from spread spectrum radio signals, which include radio signals generated from a combination of the data and a data spreading code associated with the user and radio signals generated from a combination of a predetermined sequence of pilot data and a pilot spreading code. The receiver includes a plurality of antennas, each arranged to detect a different version of the radio signals. Base band conversion means is coupled to the plurality of antennas and arranged to generate, for each antenna, base band signal samples representative of the version of the radio signals. Data recovery means operates to correlate each version of the signal samples with respect to the pilot spreading code, form at least one covariance matrix from a frequency domain representation of a predetermined temporal window of the correlated pilot signals samples, correlate each version of the signal samples with respect to the user data spreading code, form a frequency domain representation of each version of the data correlated signal samples, and detect the data from the frequency domain data correlated signal samples in combination with the at least one covariance matrix. A method used with the receiver is also provided.
    • 一种用于从扩展频谱无线电信号恢复数据的接收机,其包括从数据的组合和与用户相关联的数据扩展码产生的无线电信号以及从预定序列的导频数据和导频信号的组合产生的无线电信号 扩展码 接收机包括多个天线,每个天线被布置成检测不同版本的无线电信号。 基带转换装置耦合到多个天线,并且被布置成为每个天线产生表示无线电信号的版本的基带信号样本。 数据恢复装置用于使每个版本的信号样本相对于导频扩展码相关,从相关导频信号采样的预定时间窗口的频域表示形成至少一个协方差矩阵,将每个版本的信号采样相关联 相对于用户数据扩展码,形成数据相关信号样本的每个版本的频域表示,并且与所述至少一个协方差矩阵组合地检测来自频域数据相关信号样本的数据。 还提供了与接收器一起使用的方法。