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    • 41. 发明申请
    • METHOD AND APPARATUS FOR CHANNEL ESTIMATION
    • 信道估计的方法和装置
    • US20130272343A1
    • 2013-10-17
    • US13597202
    • 2012-08-28
    • Yun Zhang
    • Yun Zhang
    • H04B1/709H04L27/06
    • H04L25/0212H04L25/0226H04L27/2071
    • Methods and apparatuses for channel estimation are disclosed. The method includes: converting −1's in a local Barker code to 0's; receiving a first preamble symbol output from a first Barker correlator and a second preamble symbol output from a second Barker correlator with a symbol determination module, the first preamble symbol being adjacent to the second preamble symbol; multiplying a result output from the symbol determination module with a correlation result output from the cyclic Barker correlator by using a multiplication module so as to obtain a channel estimation response; and receiving channel estimation responses with a time-domain channel data storage unit, and averaging them to obtain a noise-reduced channel estimation response. The channel estimation method and apparatus of the present invention can be achieved based on few hardware resources and low computation complexity.
    • 公开了用于信道估计的方法和装置。 该方法包括:将本地Barker代码中的-1转换为0; 从第一巴克相关器输出的第一前导码符号和从第二巴克相关器输出的与码元确定模块输出的第二前导码符号,所述第一前导码符号与所述第二前导符号相邻; 通过使用乘法模块将来自符号确定模块的结果输出与从循环巴克相关器输出的相关结果相乘,以获得信道估计响应; 以及用时域信道数据存储单元接收信道估计响应,并对它们进行平均以获得噪声降低的信道估计响应。 本发明的信道估计方法和装置可以基于少量硬件资源和低计算复杂度来实现。
    • 47. 发明申请
    • Room acoustic response modeling and equalization with linear predictive coding and parametric filters
    • 房间声学响应建模和线性预测编码和参数滤波器的均衡
    • US20080205667A1
    • 2008-08-28
    • US11710019
    • 2007-02-23
    • Sunil BharitkarYun ZhangChris Kyriakakis
    • Sunil BharitkarYun ZhangChris Kyriakakis
    • H03G5/00
    • H04R3/00
    • A method for determining coefficients of a family of cascaded second order Infinite Impulse Response (IIR) parametric filters used for equalizing a room response. The method includes determining parameters of each IIR parametric filter from poles or roots of a reasonably high-order Linear Predictive Coding (LPC) model. The LPC model is able to accurately model the low-frequency room response modes providing better equalization of loudspeaker and room acoustics, particularly at the low frequencies. Advantages of the method include fast and efficient computation of the LPC model using a Levinson-Durbin recursion to solve the normal equations that arise from the least squares formulation. Due to possible band interactions between the cascaded IIR parametric filters, the method further includes optimizing the Q value of each filter to better equalize the room response.
    • 用于确定用于均衡房间响应的级联二阶无限脉冲响应(IIR)参数滤波器族的系数的方法。 该方法包括从合理高阶线性预测编码(LPC)模型的极点或根确定每个IIR参数滤波器的参数。 LPC模型能够精确地建模低频房间响应模式,提供更好的扬声器和室内声学均衡,特别是在低频。 该方法的优点包括使用Levinson-Durbin递归来快速有效地计算LPC模型,以解决由最小二乘法公式产生的正态方程。 由于级联IIR参数滤波器之间可能的频带相互作用,该方法还包括优化每个滤波器的Q值以更好地均衡房间响应。