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    • 2. 发明申请
    • CHANNEL ESTIMATOR WITH HIGH NOISE SUPPRESSION AND LOW INTERPOLATION ERROR FOR OFDM SYSTEMS
    • 具有高噪声抑制和OFDM系统低插值误差的信道估计器
    • WO2008118514A2
    • 2008-10-02
    • PCT/US2008/051571
    • 2008-01-21
    • MOTOROLA INC.NOLLETT, Bryan S.SAYANA, Krishna KamalZHUANG, Xiangyang
    • SAYANA, Krishna KamalZHUANG, Xiangyang
    • H04L25/02
    • H04L27/2647H04L25/022H04L25/0228H04L25/025
    • A receiver with DFT based channel estimation having good noise suppression for both high and low signal-to-noise ratios providing advantages over conventional DFT estimators and Minimum-Mean-Square-Error (MMSE) estimators. The use of MMSE may be incorporated for estimation at the band edges providing further improvements. The received signal in the time domain, is transformed to the frequency-domain received signal via an N-point FFT (501). The frequency-domain received signal at the pilot locations is then used to obtain a "noisy" channel estimates at the pilot subcarriers by dividing the known pilot symbols in (503). Uniformly spaced pilots are assumed over a window of usable subcarriers. Padding is applied to the initial channel estimates at both sides of the band to account for unused subcarriers such as guard spacing. Weighting factors during power estimation may take into account various noise characteristics such as combinations of known and time-limited noise power characteristics.
    • 具有基于DFT的信道估计的接收机对于高和低信噪比具有良好的噪声抑制,提供优于常规DFT估计器和最小均方误差(MMSE)估计器的优点。 可以并入MMSE的使用以便在带边缘进行估计,从而提供进一步的改进。 时域中的接收信号通过N点FFT被转换成频域接收信号(501)。 导频位置处的频域接收信号然后用于通过划分(503)中的已知导频符号来在导频子载波处获得“噪声”信道估计。 在可用子载波的窗口上假设均匀间隔的导频。 填充应用于频带两侧的初始信道估计,以解决未使用的子载波,例如保护间隔。 功率估计期间的加权因子可以考虑各种噪声特性,例如已知和时间有限的噪声功率特性的组合。