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    • 2. 发明授权
    • Device, system, and method of flicker noise mitigation
    • 闪烁噪声抑制的装置,系统和方法
    • US08019007B2
    • 2011-09-13
    • US11865735
    • 2007-10-02
    • Surendra BoppanaMasoud SajadiehHossein Alavi
    • Surendra BoppanaMasoud SajadiehHossein Alavi
    • H04K1/10
    • H04L27/2647H04B1/123
    • Device, system, and method of flicker noise mitigation. For example, an apparatus includes a digital adaptive filter to mitigate flicker noise from a received Orthogonal Frequency-Division Multiplexing (OFDM) signal, wherein the digital adaptive filter includes: a prediction filter to estimate a value of the flicker noise based on linear combination of past low-pass filtered signal samples; a trainer sub-circuit to modify a coefficient of the prediction filter based on a difference between: a known incoming signal filtered by the prediction filter in a training stage, and a locally-generated reference copy of the known signal; a first path including a first pair of analysis-synthesis filters; and a second, parallel, path including a second pair of analysis-synthesis filters and further including the prediction filter.
    • 闪烁噪声抑制的装置,系统和方法。 例如,一种装置包括数字自适应滤波器,用于从接收到的正交频分复用(OFDM)信号中减轻闪烁噪声,其中数字自适应滤波器包括:预测滤波器,用于基于线性组合的线性组合来估计闪烁噪声的值 过去的低通滤波信号样本; 基于在训练阶段由预测滤波器滤波的已知输入信号和已知信号的本地生成的参考副本之间的差异来修改预测滤波器的系数的训练器子电路; 包括第一对分析合成滤波器的第一路径; 以及包括第二对分析合成滤波器并且还包括所述预测滤波器的第二并行路径。
    • 3. 发明授权
    • Fully digital symbol synchronization technique
    • 全数字符号同步技术
    • US06799193B2
    • 2004-09-28
    • US10022465
    • 2001-12-14
    • Mehdi T. KilaniHossein Alavi
    • Mehdi T. KilaniHossein Alavi
    • G06F1715
    • H04L7/042H04L7/08
    • One aspect of the invention provides a novel scheme to synchronize signal reception for a receiver device. In one embodiment, multi-symbol correlation of a first signal and a reference signal is performed. The reference signal corresponds to symbols denoting a synchronization or alignment marker. For every first signal sample, an indication of the degree of similarity between a plurality of the first signal symbols and reference signal symbols is generate as a second signal. This second signal is then nonlinearly processed, linearly processed, and then nonlinearly processed over time to determine if indications of high degrees of correlation occur at periodic intervals. If so, then these are considered synchronization markers and are used to synchronize signal reception of the receiver device.
    • 本发明的一个方面提供了一种用于使接收机设备的信号接收同步的新方案。 在一个实施例中,执行第一信号和参考信号的多符号相关。 参考信号对应于表示同步或对准标记的符号。 对于每个第一信号样本,生成多个第一信号符号和参考信号符号之间的相似程度的指示作为第二信号。 然后对该第二信号进行非线性处理,线性处理,然后随时间非线性处理,以确定是否在周期性间隔发生高度相关的指示。 如果是这样,那么这些被认为是同步标记,并且用于同步接收器设备的信号接收。
    • 8. 发明授权
    • System and method of signal wave shaping for spectrum control of an OFDM signal
    • 用于OFDM信号频谱控制的信号波整形系统和方法
    • US07215715B2
    • 2007-05-08
    • US09900087
    • 2001-07-06
    • Ahmad ChiniHossein AlaviMohammad Reza Movahedin
    • Ahmad ChiniHossein AlaviMohammad Reza Movahedin
    • H04K1/02H04K1/10
    • H04L27/2626H04L27/2644
    • A system and method of controlling the spectrum of an orthogonal frequency division multiplexing (OFDM) signal. The method comprises receiving an input frame of data samples to be modulated onto orthogonal multi-carrier signals, performing frequency domain filtering and spectrum masking on the input frame of data samples, and modulating the respective frequency modified data samples onto a plurality of carriers. Such a system may include an over sampling logic to over sample the input data to increase the frequency resolution of the output spectrum, a wave shaping filter to perform frequency domain filtering of the input data, a spectrum mask to further modify the spectrum of the output signal, and an inverse fast Fourier transform (IFFT) to generate the modulated orthogonal multi-carrier signal. Another embodiment entails controlling the spectrum of the output OFDM signal by performing time-domain filtering.
    • 一种控制正交频分复用(OFDM)信号的频谱的系统和方法。 该方法包括接收要调制到正交多载波信号上的数据采样的输入帧,对数据采样的输入帧执行频域滤波和频谱掩蔽,并将各个频率修正的数据样本调制到多个载波上。 这样的系统可以包括过采样逻辑以对输入数据进行过采样以增加输出频谱的频率分辨率,波形整形滤波器以对输入数据进行频域滤波,频谱掩模以进一步修改输出的频谱 信号和快速傅里叶逆变换(IFFT),以产生调制的正交多载波信号。 另一个实施例需要通过执行时域滤波来控制输出OFDM信号的频谱。