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1. 发明公开

EP0669058A1 PROGRAMMABLE NOISE BANDWIDTH REDUCTION BY MEANS OF DIGITAL AVERAGING 失效
标题翻译：通过数字平均可编程噪声带宽降低
公开(公告)号：EP0669058A1
公开(公告)日：1995-08-30
申请号：EP92915452.0
申请日：1992-07-16
申请人： COMMUNICATIONS SATELLITE CORPORATION
发明人： POKLEMBA, John, J.
IPC分类号： H03H17 , H04B1 , H04L7
CPC分类号： H04B1/1027 , H04B2001/1054
摘要： A pre-averager for digitally averaging the samples of an input data signal (26) over two or more symbols, the averaging interval being defined by the input sampling rate divided by the output sampling rate. As the averaged sample is clocked (29o, 29e) to a suitable detector at a much slower rate than the input signal sampling rate the noise bandwith at the input to the detector is reduced. The pre-averager forms a data filter (50a, 50b, 50c, 50d) having an output sampling rate of one sample per symbol of received data. More specifically, selected ones of a plurality of samples accumulated (28a, 28b, 28c, 28d) over two or more symbol intervals are output in response to clock signals at a rate of one sample per symbol interval. The pre-averager includes circuitry (40, 44) for weighting digitized signal using stored finite impulse response (FIR) filter coefficients (42).
摘要翻译：预平均器，用于在两个或更多符号上对输入数据信号（26）的样本进行数字平均，平均间隔由输入采样率除以输出采样率确定。由于平均样本以比输入信号采样速率慢得多的速率被定时（29o，29e）到合适的检测器，因此检测器输入处的噪声带宽减少。预平均器形成数据滤波器（50a，50b，50c，50d），其具有每接收数据码元一个采样的输出采样率。更具体地说，响应于每符号间隔一个样本的速率的时钟信号，输出在两个或更多个符号间隔上累积的多个样本（28a，28b，28c，28d）中的选定样本。预平均器包括用于使用存储的有限脉冲响应（FIR）滤波器系数（42）对数字化信号进行加权的电路（40,44）。

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