公开(公告)号：US07395493B2

公开(公告)日：2008-07-01

申请号：US10161812

申请日：2002-06-04

申请人： Walid Ahmed ,  Juan G. Gonzalez ,  Salim Manji ,  Jose Luis Paredes

发明人： Walid Ahmed ,  Juan G. Gonzalez ,  Salim Manji ,  Jose Luis Paredes

IPC分类号： H03M13/03

CPC分类号： H04L25/03292

摘要： The present invention provides systems and methods for adaptively decoding transmitted frames efficiently in non-Gaussian, non-stationary environments. One such system comprises a decoder adapted to decode a received transmission frame using a decoding scheme, a channel assessment unit for sensing channel characteristics, and a tuning unit for adjusting the decoding scheme based, at least in part, on channel characteristics sensed by the channel assessment unit.

摘要翻译： 本发明提供了用于在非高斯非平稳环境中有效地自适应地解码发送帧的系统和方法。 一种这样的系统包括：解码器，其适于使用解码方案对接收到的传输帧进行解码;用于感测信道特性的信道评估单元;以及用于至少部分地基于由信道感测的信道特性来调整解码方案的调谐单元 评估单位

公开(公告)号：US07120210B1

公开(公告)日：2006-10-10

申请号：US10155377

申请日：2002-05-24

申请人： Juan G Gonzalez ,  Salim Manji ,  Jose L Paredes

发明人： Juan G Gonzalez ,  Salim Manji ,  Jose L Paredes

IPC分类号： H03D1/04 ,  H04B1/10 ,  H04L1/00 ,  H04L27/22

CPC分类号： H04L1/0045 ,  H04L25/067 ,  H04L27/22

摘要： A clipped metric function is utilized to mitigate the adverse effects of impulsive noise (e.g., lightening, motor vehicle ignition noise) on communications signals. The clipped metric function may be used alone or in conjunction with conventional signal clipping. In one embodiment, a clipped Euclidean metric function is determined as a function of the input signal. The input signal is processed in accordance with the clipped Euclidean metric function, to provide a clipped metric signal. The clipped metric signal is processed in accordance with application dependent requirements. The clipped metric function provides improved performance over conventional signal clipping. For example, utilization of a clipped metric function provides improved performance in situations in which the impulsive noise does not increase the amplitude of the input signal to a level that would be clipped by signal clipping.

摘要翻译： 使用限幅度量函数来减轻脉冲噪声（例如减轻，机动车辆点火噪声）对通信信号的不利影响。 限幅度量函数可以单独使用或结合常规信号限幅使用。 在一个实施例中，根据输入信号确定限幅欧几里德度量函数。 输入信号根据剪切的欧几里德度量函数进行处理，以提供限幅度量标准信号。 限幅度量信号根据应用依赖的要求进行处理。 剪切度量功能提供了比传统信号限幅更好的性能。 例如，在脉冲噪声不会将输入信号的幅度增加到由信号削波所限制的电平的情况下，使用限幅度量功能提供改进的性能。

公开(公告)号：US06961397B2

公开(公告)日：2005-11-01

申请号：US09903881

申请日：2001-07-12

申请人： Walid Ahmed ,  Juan G. Gonzalez ,  Salim Manji ,  Jose Luis Paredes

发明人： Walid Ahmed ,  Juan G. Gonzalez ,  Salim Manji ,  Jose Luis Paredes

IPC分类号： H04L7/02 ,  H04L7/00

CPC分类号： H04L7/0062

摘要： A symbol synchronizer comprises a distance metric computation module for computing a metric from received samples using a distance metric function within a symbol sampling period and based on a timing signal for each of the possible symbols in a constellation, a control signal computation module for selecting a smallest and a second smallest metrics, producing a difference by subtracting the smallest metric from the second smallest metric, and deriving a control signal from the difference, and a voltage-control clock for producing the timing signal based on the control signal.

摘要翻译： 符号同步器包括距离度量计算模块，用于使用符号采样周期内的距离度量函数从接收到的采样中计算度量，并且基于星座中的每个可能符号的定时信号，用于选择一个 最小和第二最小度量，通过从第二最小度量中减去最小度量并从差导出控制信号，产生差值，以及用于根据控制信号产生定时信号的电压控制时钟。

公开(公告)号：US07386779B2

公开(公告)日：2008-06-10

申请号：US10159523

申请日：2002-05-31

申请人： Walid Ahmed ,  Juan G. Gonzalez ,  Salim Manji ,  Jose Luis Paredes

发明人： Walid Ahmed ,  Juan G. Gonzalez ,  Salim Manji ,  Jose Luis Paredes

IPC分类号： H03M13/00 ,  H03M13/03 ,  H03D1/00

CPC分类号： H04L1/0054 ,  H03M13/00 ,  H04L1/0059 ,  H04L1/0061 ,  H04L1/0065 ,  H04L1/02

摘要： The present invention provides systems and methods for correcting errors in a received frame. The present invention introduces diversity into an error detection and correction system at the receiver side by decoding a received frame using a plurality of decoding schemes. Each of these schemes are optimized for a different set of underlying assumptions. The schemes may be optimized to account for various types of noise including, not limited to, Gaussian noise and impulsive noise. The plurality of decoded frames are then validated using an outer decoder to choose a valid frame from candidate decoded frames. By including a plurality of decoders using a plurality of decoding schemes, the error detection and correction system may accurately detect and correct errors in a constantly changing environment having constantly changing noise patterns.

摘要翻译： 本发明提供了用于校正接收帧中的错误的系统和方法。 本发明通过使用多种解码方案对接收到的帧进行解码来将分集引入接收机侧的错误检测和校正系统。 这些方案中的每一个都针对不同的一组基本假设进行了优化。 这些方案可以被优化以考虑各种类型的噪声，包括但不限于高斯噪声和脉冲噪声。 然后使用外部解码器来验证多个解码的帧，以从候选解码帧中选择有效帧。 通过使用多个解码方案包括多个解码器，错误检测和校正系统可以在具有不断变化的噪声模式的不断变化的环境中准确地检测和校正错误。