| 摘要 |
An adaptive multi-channel (AMC) modem that can receive one or multiple spread spectrum signals simultaneously includes an adjustable filter, a DeltaSigma ADC, and a digital processor. The adjustable filter filters an input signal with an adjustable bandwidth and provides an output signal comprised of a selected number of spread spectrum signals. The DeltaSigma ADC digitizes the output signal and provides data samples. The sampling rate and/or the reference voltage of the DeltaSigma ADC may be varied to obtain the desired performance. The digital processor processes the data samples for each spread spectrum signal to recover data sent in that signal. A controller ascertains the operating conditions (e.g., the desired signal level, the undesired signal level, and so on) and selects the number of spread spectrum signals to receive based on the operating conditions, user requirements, and possibly other factors.
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