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A goal in the software radio design philosophy is to place the analog-to-digital converter as near the antenna as
possible. This objective has been demonstrated for the case of a single input signal. Bandpass sampling has been applied to
downconvert, or intentionally alias, the information bandwidth of a radio frequency (RF) signal to a desired intermediate frequency.
The design of the software radio becomes more interesting when two or more distinct signals are received. The traditional approach
for multiple signals would be to bandpass sample a continuous span of spectrum containing all the desired signals.
The disadvantage with this approach is that the sampling rate and associated discrete processing rate are based on the span of spectrum as opposed to the information bandwidths of the signals of interest. |
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eetop公众号
创芯大讲堂
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发表于 2014-10-30 12:42:27
