| 摘要 |
A system for digital selection diversity includes receiving different versions of a signal sit different antennas (222, 226) of a receiver (210), and processing the different versions on separate branches each having a digital downconverter (224, 228) and filter (232, 236). The filters are controlled by a diversity switch selector (250) so that one acts to filter (the active branch), and the others decimate, their respective input signal versions, based on detected signal quality. The diversity switch selector also controls a demodulator (240) to demodulate the filtered signal. The decimated signals are used to provide both signal quality information, and phase history when a branch becomes active. When the signal quality on an inactive branch is determined to be the greatest, the diversity switch controller controls that branch's filter to switch to a filter mode, and the demodulator to use the last decimated sample for phase history when initially demodulating the signal version coming from the newly active branch.
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