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18 条记录 (耗时 0.02 秒)

    Blind channel estimation and data detection for PSK OFDM-based receivers
    1.
    发明授权
    Blind channel estimation and data detection for PSK OFDM-based receivers 有权

    公开(公告)号：US06983029B2

    公开(公告)日：2006-01-03

    申请号：US09940381

    申请日：2001-08-27

    申请人： Hossein Alavi ,  Mohammad Javad Omidi ,  Mehdi Tavassoli Kilani ,  Ahmad Chini

    发明人： Hossein Alavi ,  Mohammad Javad Omidi ,  Mehdi Tavassoli Kilani ,  Ahmad Chini

    IPC分类号： H03D3/22 ,  H04L27/22

    CPC分类号： H04L27/2647 ,  H04L1/20 ,  H04L27/22

    摘要： In general, one embodiment of the invention relates to a method for detecting data bits and estimating the channel reliability of each carrier. The detection method comprises (i) computing a complex phase difference between a current symbol and a previous symbol, (ii) separating a real value component (R) from a corresponding imaginary value component (I) forming the complex phase difference, (iii) determining at least one boundary constraint line of a complex phase map for a selected demodulation scheme, and computing an arithmetic combination of the real value component and the corresponding imaginary value component to detect whether a series of bits falls within a selected region of the complex phase map defined by the at least one boundary constraint line. Over N symbols propagating over a carrier, including the current symbol and the previous symbol, the channel estimation counts a number of symbols (less than N but greater than a threshold) that fall within an estimated area of the complex phase map. The estimated area is bound by boundary constraint lines based on a parameterized real value component.

    Wideband symbol synchronization in the presence of multiple strong narrowband interference
    4.
    发明授权
    Wideband symbol synchronization in the presence of multiple strong narrowband interference 有权
    宽带符号同步存在多个强窄带干扰

    公开(公告)号：US06912262B1

    公开(公告)日：2005-06-28

    申请号：US09939424

    申请日：2001-08-24

    申请人： Ahmad Chini ,  Hossein Alavi ,  Mehdi T. Kilani ,  Mohammad J. Omidi

    发明人： Ahmad Chini ,  Hossein Alavi ,  Mehdi T. Kilani ,  Mohammad J. Omidi

    IPC分类号： H04B1/707 ,  H04L7/04 ,  H04L27/26 ,  H04L7/00

    CPC分类号： H04B1/7102 ,  H04L7/027 ,  H04L7/04 ,  H04L27/2662 ,  H04L27/2675

    摘要： A method and apparatus for time-shift extraction in a wideband transmitted signal containing strong narrowband interference or noise. The time-shift extraction is based on the time domain and frequency domain relation of symbol misalignment. The invention uses the sign of the product of a recieved signal sample and a reference symbol in the frequency domain to determine the time-shift. It does not rely on the signal magnitude and is therefore less dependent on the signal gain. It also does not rely on the soft phase values, which have ambiguity for values more than three hundred sixty (360) degrees.

    摘要翻译： 一种用于在包含强窄带干扰或噪声的宽带发射信号中进行时移提取的方法和装置。 时移提取是基于符号未对准的时域和频域关系。 本发明使用接收信号样本和频域中的参考符号的乘积的符号来确定时移。 它不依赖于信号幅度，因此较少依赖于信号增益。 它也不依赖于软相位值，它们对于超过三百六十（360）度的值具有模糊性。

    System and method of signal wave shaping for spectrum control of an OFDM signal
    6.
    发明授权
    System and method of signal wave shaping for spectrum control of an OFDM signal 有权
    用于OFDM信号频谱控制的信号波整形系统和方法

    公开(公告)号：US07215715B2

    公开(公告)日：2007-05-08

    申请号：US09900087

    申请日：2001-07-06

    申请人： Ahmad Chini ,  Hossein Alavi ,  Mohammad Reza Movahedin

    发明人： Ahmad Chini ,  Hossein Alavi ,  Mohammad Reza Movahedin

    IPC分类号： H04K1/02 ,  H04K1/10

    CPC分类号： H04L27/2626 ,  H04L27/2644

    摘要： 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.

    摘要翻译： 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。

    Energy Efficiency Ethernet with Assymetric Low Power Idle
    8.
    发明申请
    Energy Efficiency Ethernet with Assymetric Low Power Idle 有权
    节能低功率以太网与低功耗空闲

    公开(公告)号：US20120320771A1

    公开(公告)日：2012-12-20

    申请号：US13478228

    申请日：2012-05-23

    申请人： Ahmad Chini ,  Mehmet Tazebay

    发明人： Ahmad Chini ,  Mehmet Tazebay

    IPC分类号： H04L12/26 ,  H04W52/02

    CPC分类号： H04L12/12 ,  H04L12/40039 ,  Y02D30/30 ,  Y02D30/32 ,  Y02D50/20 ,  Y02D50/40 ,  Y02D50/42

    摘要： Energy efficient Ethernet with asymmetric low power idle. Low power idle mode is typically leveraged when both direction of a link do not have data traffic to transmit. Such a requirement reduces the application of low power idle due to the frequent existence of data traffic in only one direction. An asymmetric low power idle mode enables reduction in power consumption and signal emissions even when one direction has data traffic to transmit.

    摘要翻译： 节能以太网具有不对称低功耗空闲。 当链路的两个方向都没有要传输的数据流量时，通常利用低功耗空闲模式。 这样的要求降低了由于在一个方向上频繁存在数据业务而导致的低功率空闲的应用。 不对称的低功率空闲模式能够降低功耗和信号发射，即使一个方向具有要发送的数据流量。

    Ethernet physical layer device using time division duplex
    9.
    发明授权
    Ethernet physical layer device using time division duplex 有权
    以太网物理层设备采用时分双工

    公开(公告)号：US09001714B2

    公开(公告)日：2015-04-07

    申请号：US13300996

    申请日：2011-11-21

    申请人： Ahmad Chini ,  Mehmet Tazebay ,  Scott Powell

    发明人： Ahmad Chini ,  Mehmet Tazebay ,  Scott Powell

    IPC分类号： H04L5/14 ,  H04L12/403

    CPC分类号： H04L5/1469 ,  H04L5/1423 ,  H04L12/4035

    摘要： An Ethernet physical layer device using time division duplex. A time division duplex frame can be defined with uplink and downlink transmission periods. These defined uplink and downlink transmission periods can be adjusted based on bandwidth and latency considerations on the network link.

    摘要翻译： 使用时分双工的以太网物理层设备。 可以用上行链路和下行链路传输周期来定义时分双工帧。 这些定义的上行链路和下行链路传输周期可以基于网络链路上的带宽和等待时间考虑进行调整。

    Extension of Ethernet PHY to channels with bridged tap wires
    10.
    发明授权
    Extension of Ethernet PHY to channels with bridged tap wires 有权
    将以太网PHY扩展到具有桥接分接线的通道

    公开(公告)号：US08638895B2

    公开(公告)日：2014-01-28

    申请号：US13409537

    申请日：2012-03-01

    申请人： Ahmad Chini ,  Mehmet Tazebay ,  Scott Powell

    发明人： Ahmad Chini ,  Mehmet Tazebay ,  Scott Powell

    IPC分类号： H04L7/00

    CPC分类号： H04L25/03057 ,  H04L7/041 ,  H04L7/08 ,  H04L25/0212 ,  H04L2025/03681 ,  H04L2025/03783

    摘要： In one embodiment, receiving an Ethernet signal over a channel, the Ethernet signal comprising a preamble frame, an idle frame, and a data frame, the preamble frame comprising one or more preamble codes; synchronizing to the Ethernet signal based on the preamble frame; replicating the one or more preamble codes; and training a decision feedback equalizer (DFE) based on the one or more replicated codes, the training enabling the DFE to use decision values at the DFE output to track channel variations.

    摘要翻译： 在一个实施例中，通过信道接收以太网信号，所述以太网信号包括前同步码帧，空闲帧和数据帧，所述前同步码帧包括一个或多个前导码; 基于前导码帧与以太网信号同步; 复制一个或多个前导码; 并且基于一个或多个复制代码来训练判决反馈均衡器（DFE），所述训练使DFE能够使用DFE输出处的判定值来跟踪信道变化。