H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 1/10 (2006.01) H03H 17/06 (2006.01) H04L 25/08 (2006.01)
Patent
CA 2102500
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 (290, 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).
Comsat Corporation
Gowling Lafleur Henderson Llp
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