公开(公告)号：US20140294058A1

公开(公告)日：2014-10-02

申请号：US14170010

申请日：2014-01-31

Applicant: IMAGINATION TECHNOLOGIES, LTD.

Inventor： Taku YAMAGATA

IPC: H04L25/03

CPC classification number: H04L25/03159 ,  H04L25/0212 ,  H04L2025/03611 ,  H04L2025/03656

Abstract: Methods of efficient calculation of initial equaliser coefficients are described. In a first stage, a channel matched filter is generated based on an estimate of CIR and then used to filter the CIR estimate. In a second stage, initial FFE coefficients are calculated from a portion of the match filtered CIR and then these initial FFE coefficients and the estimate of CIR may be used to generate initial DFE coefficients. In various embodiments, a window is applied to the CIR estimate before the matched filter is generated. In various embodiments, the second stage is iterated to minimise the pre-echoes following the FFE.

Abstract translation: 描述了初始均衡器系数的有效计算方法。 在第一阶段，基于CIR的估计生成信道匹配滤波器，然后用于过滤CIR估计。 在第二级中，从匹配滤波CIR的一部分计算初始FFE系数，然后这些初始FFE系数和CIR的估计可以用于产生初始DFE系数。 在各种实施例中，在生成匹配滤波器之前，将窗口应用于CIR估计。 在各种实施例中，迭代第二阶段以最小化跟随FFE的前回波。

公开(公告)号：US20140218222A1

公开(公告)日：2014-08-07

申请号：US14153251

申请日：2014-01-13

Applicant: IMAGINATION TECHNOLOGIES, LTD.

Inventor： Taku YAMAGATA ,  Adrian John ANDERSON

IPC: H03M1/08 ,  H03M1/12

CPC classification number: H03M1/08 ,  H03G3/3052 ,  H03M1/12 ,  H03M1/185

Abstract: Methods and circuits for controlling an automatic gain control (AGC) circuit wherein the AGC circuit is used to adjust the gain of a signal input to an analog to digital converter. The method includes obtaining a plurality of samples from the output of the analog to digital converter and determining whether the amplitude of each sample is greater than a threshold amplitude value. If the amplitude of a sample is greater than the threshold amplitude value then a counter value is incremented. The target average amplitude of the automatic gain control circuit is then periodically adjusted based on the counter value.

Abstract translation: 用于控制自动增益控制（AGC）电路的方法和电路，其中AGC电路用于调节输入到模数转换器的信号的增益。 该方法包括从模数转换器的输出获得多个样本，并确定每个样本的幅度是否大于阈值振幅值。 如果样本的幅度大于阈值振幅值，则计数器值增加。 然后基于计数器值周期性地调整自动增益控制电路的目标平均幅度。