High-frequency Receiver with Multiple-channel Digital Processing

In the receive subsystem, the analogue-digital converter (40) works on the output of the low-noise amplifier (33), at a chosen rate (F), which corresponds to a bandwidth sampling. The processing stages comprise a custom circuit (5), with * an input memory (510) arranged to contain N successive digital samples, renewed at the chosen rate in blocks of M samples, * a complex digital low-pass filtering function (511, 512), of chosen cut-off frequency, operating on the input memory to supply N filtered digital samples (515), * an M-periodic summing function (531) on the N filtered digital samples, supplying M filtered and summed digital samples (533), * an M ' M discrete Fourier transform stage (55), operating on these M filtered and summed digital samples, the digital signals on the M outputs (559) of the Fourier transform representing M separate channels,; of width defined by the cut-off frequency of the abovementioned low-pass filter.

Attached files:
WO 2008142278.jpg

WO 2,008,142,278


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