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    • 5. 发明授权
    • Iterative assessment of multipath signal presence
    • 多径信号存在的迭代评估
    • US07170944B1
    • 2007-01-30
    • US10291154
    • 2002-11-07
    • Qin LiuLin Yang
    • Qin LiuLin Yang
    • H04L27/28H04J11/00
    • H04L25/03006H04B1/7113H04L25/0202H04L27/261H04L2025/03598
    • Method and system for determining whether one or more multipath signals is present in a received signal frame that includes a reference symbol (RS) sequence RS(t;m1) as part of the frame, and for iteratively evaluating a multipath signal that is present. The RS sequence index (m1) for the frame is identified, and first and second Fourier transforms Φ(f;m1;ref) and Φ(f;rec) for the received frame are provided for a selected time segment IS that includes the RS sequence of the received frame. An inverse Fourier transform σ(t;m1) of the ratio of the transforms is computed and analyzed. If at least one multipath signal is present, σ(t;m1) is nonlinearly filtered, and the filtered function is convolved with RS(t;m1). This convolution represents a received signal extension, due to multipath signal(s) presence. A refinement procedure analyzes a contribution to multipath signals from the preceding frame(s). The procedure is iteratively driven toward an optimal representation of any multipath signal(s) present.
    • 用于确定在包括作为帧的一部分的参考符号(RS)序列RS(t; m 1)的接收信号帧中是否存在一个或多个多径信号的方法和系统,并且用于迭代地评估存在的多径信号 。 识别该帧的RS序列索引(m 1),并且为所选择的时间段IS提供接收帧的第一和第二傅里叶变换Phi(f; m 1; ref)和Phi(f; rec) 接收帧的RS序列。 计算和分析变换比率的傅立叶逆变换Σ(t; m 1)。 如果存在至少一个多径信号,则σ(t; m 1)被非线性滤波,滤波后的函数与RS(t; m 1)卷积。 由于多路径信号存在,该卷积表示接收到的信号扩展。 细化程序分析对来自前一帧的多路径信号的贡献。 该过程被迭代地驱动到存在的任何多径信号的最佳表示。
    • 10. 发明授权
    • Adapted phase noise estimation and compensation
    • 适应相位噪声估计和补偿
    • US06996192B1
    • 2006-02-07
    • US10359430
    • 2003-02-05
    • Qin LiuLin Yang
    • Qin LiuLin Yang
    • H04L27/06
    • H04L27/2657H04L27/2675H04L27/2695
    • Method and system for adaptively estimating and compensating for phase noise error in a received signal s(t;data). A plurality of transmission parameter symbol (TPS) sets, each with a representative TPS group frequency, are incorporated in the signal before transmission. Received channel response amplitudes are analyzed to select a particular TPS frequency group, and inverse Fourier transforms, N(t) and D(t), are computed for these chosen signals. A complex ratio, r(t)=N(t)/D(t), is computed and used to determine a phase angle φ(t). A phase noise error compensated, time domain signal, equal to exp{−jφ(t)}·s(t−Δt(delay);data) is provided.
    • 用于自适应地估计和补偿接收信号s(t;数据)中的相位噪声误差的方法和系统。 具有代表性的TPS组频率的多个传输参数符号(TPS)集合被并入传输之前的信号中。 分析接收的信道响应幅度以选择特定的TPS频率组,并且为这些选择的信号计算反傅立叶变换N(t)和D(t)。 计算复数比r(t)= N(t)/ D(t)并用于确定相位角phi(t)。 提供相位噪声误差补偿,时域信号等于exp {-jphi(t.s(t-Deltat(delay); data)。