Selective modification of antenna directivity pattern to adaptively cancel co-channel interference in TDMA cellular communication system
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United States of America Patent
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Jun 25, 2002
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app pub date -
May 19, 1998
filing date -
May 19, 1998
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Abstract
A base station signal processing mechanism for a time division multiple access (TDMA) cellular communication system adaptively controls weighting coefficients of the base station's phased array antenna in a manner that forms a directivity pattern whose gain and/or nulls maximize the signal to noise ratio in the presence of co-channel users whose communication time slots overlap a communication time slot of a desired user. The signal processing mechanism performs correlation processing of synchronization patterns contained in signals transmitted by co-channel users to identify times of transitions between successive co-channel users' communication time slots relative to a time of transition of the desired user's communication time slot, and deriving weighting coefficients in accordance with the times of transitions.
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