Patent ID: 6032033
Filing Date: 2000-02-29
Classification: H04B

Abstract:
A TDMA (time division multiple access) radio receiver for receiving bursts including a previous burst and a present data burst both from a particular transmitter between which there are bursts from other transmitters each burst having a plurality of symbols divided into a preamble, a sync word and a data field, the receiver comprising:a) a plurality of alternatively connectable antenna channels;b) a digital demodulator for digitally demodulating the previous burst before recovery of the sync word to produce a demodulated bit stream;c) a sync word demodulator for searching for the sync word in the demodulated bit stream and generating an indication that the sync word has been received in the previous burst;d) a timer for measuring forward in time from detection of the sync word of the previous burst to provide an estimate of the beginning of the preamble of the present burst;e) an antenna channel selector for controlling which of the plurality of antenna channels is connected and for making performance measurements, during reception of the preamble for the present burst the antenna channel selector connecting the plurality of antenna channels in turn and making a performance measurement for each antenna channel and after all the performance measurements are made the antenna channel selector connecting to the receiver the antenna channel with the best performance measurement, the first performance measurement being made during a period having a start time related to the estimate of the beginning of the preamble of the present burst.