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    Dual decision feedback equalizer with selective attenuation to improve channel performance
    1.
    发明授权
    Dual decision feedback equalizer with selective attenuation to improve channel performance 失效
    双重判决反馈均衡器，具有选择性衰减，以提高通道性能

    公开(公告)号：US06307884B1

    公开(公告)日：2001-10-23

    申请号：US09087168

    申请日：1998-05-29

    申请人： Ke Du ,  Yujie Xu

    发明人： Ke Du ,  Yujie Xu

    IPC分类号： H03H730

    CPC分类号： H04L25/061 ,  H04L25/03057 ,  H04L2025/0349 ,  H04L2025/03566

    摘要： An apparatus and method for improving error rate performance in a communication channel utilizes a dual decision feedback equalizer (DDFE) through the application of selective attenuation. An improved DDFE comprises first and second decision feedback equalizers (DFEs) operably connected in parallel to receive a series of input signals zk. The DFEs independently generate two series of decisions â ;1k and â ;2k in relation to peak magnitudes of the series of transmitted signals zk by filtering the series of decisions â ;1k and â ;2k to generate filtered outputs (a*p)1k and (a*p)2k based on previous decisions, and summing the filtered outputs (a*p)1k and (a*p)2k with the transmitted input series zk to generate two series of decision variables ã1k and ã2k, to remove effects of intersymbol interference. The improved DDFE further comprises first and second attenuation blocks, so that when a mismatch is detected between the series of decisions â ;1k and â ;2k, a selective attenuation gain less than one is introduced into each feedback filter loop. This results in a reallocation of some of the decision energy associated with the correct series of decisions to the erroneous series and helps the erroneous DFE to make correct decisions sooner, thereby improving the error rate performance of the channel.

    摘要翻译： 用于提高通信信道中的误码率性能的装置和方法通过应用选择性衰减来利用双判决反馈均衡器（DDFE）。 改进的DDFE包括并行可操作地连接以接收一系列输入信号zk的第一和第二判决反馈均衡器（DFE）。 DFE通过过滤一系列决策＆acirc; 1k和＆acirc; 2k来独立生成两系列决策与acirc; 1k和＆acirc; 2k相关于一系列传输信号zk的峰值幅度，以生成滤波输出（a * p）1k 和（a * p）2k，并且将所滤波的输出（a * p）1k和（a * p）2k与发送的输入序列zk相加以生成两个系列的决定变量ã1k和ã2k，以去除效果 的符号间干扰。 改进的DDFE还包括第一和第二衰减块，使得当在一系列决策与acirc 1k和＆acirc; 2k之间检测到失配时，在每个反馈滤波器环路中引入小于1的选择性衰减增益。 这导致将与正确的一系列决策相关联的一些决策能量重新分配给错误的系列，并且有助于错误的DFE更早地作出正确的决定，从而提高了频道的错误率性能。