Detecting Digital Radio Signals

摘要

In one embodiment, a receiver front end circuit can receive and process multiple radio frequency (RF) signals and output downconverted signals corresponding to these signals. In turn, multiple signal processors can be coupled to this front end. Specifically, a first signal processor can receive and process the downconverted signals to output a first signal obtained from content of a first RF signal, and a second signal processor can receive and process the downconverted signals to output a second signal obtained from content of a second RF signal. In addition, the apparatus may include a detection circuit coupled to the receiver front end circuit to detect presence of at least the second signal and enable the second signal processor responsive to the detected presence.

主权项

1. An apparatus comprising:
a filter to receive a band limited signal downconverted from a radio signal and to filter the band limited signal according to a pulse shaping function used to encode the radio signal; a peak detector to detect peaks within the filter output; and a controller to detect presence of a valid signal within the radio signal based at least in part on the detected peaks.