Antenna diversity system with phase-regulated summation of antenna signals has logic switch switched to different setting to change received signal paths if received signal noise detected

摘要

The system has a multi-antenna system with and a receiver with inputs for two reception signal paths. The signals are summed with phase equality and the summation signal frequency demodulated. A controlable logic switch feeds different received signals to at least one of the two receiver inputs in diversity fashion. A summation signal is fed to a noise detector. The logic switch switches to a different setting if received signal noise is detected. The system has a multi-antenna system (21) with at least two antenna output signals and a receiver (4) with inputs for two reception signal paths, the second containing a phase rotation device (34) controled by a phase regulator and whose output has the same phase as in the first path. The signals are summed with phase equality and the summation signal frequency demodulated. A controlable logic switch (11) is used to feed different received signals to at least one of the two receiver inputs in diversity fashion and the summation signal (37) is fed to a noise detector (18) for external rapid detection of a summation signal distorted by frequency noise. The logic switch is switched to a different setting if received signal noise is detected. The phase control device has low pass characteristics for limiting the phase control rate.