Cisco Systems, Inc.
Pseudo low IF for zero IF receiver to reduce dynamic frequency selection (DFS) falsing

Abstract:

A pseudo low intermediate frequency (IF) configuration is provided for a receiver having a zero IF radio architecture dedicated for radar detection, in order to reduce false radar detection. Energy from local oscillator leakage is shifted away from DC. After filtering out of the desired sub-channel, the local oscillator leakage energy is suppressed, reducing false radar detection.