초록 ▼

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

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.

대표청구항 ▼

1. For use with a time division multiple access (TDMA) cellular communication system having a plurality of cells, that are dispersed relative to a cell in which a desired user conducts communications with a base station in said cell, and wherein said dispersed cells contain users which may transmit

1. For use with a time division multiple access (TDMA) cellular communication system having a plurality of cells, that are dispersed relative to a cell in which a desired user conducts communications with a base station in said cell, and wherein said dispersed cells contain users which may transmit during time slots that overlap a user time slot used for communications between said user and said base station, a method of reducing interference, as a result of transmissions from said users in said dispersed cells during said time slots, with communications between said user and said base station, said method comprising, at said base station, the steps of:(a) communicating with said user by way of an antenna having a directivity pattern the gain of which may be selectively reduced in directions of said users in said dispersed cells; (b) receiving transmissions from said users in said dispersed cells and processing contents of received transmissions to determine offsets of said time slots relative to said user time slot; and (c) adjusting said directivity pattern in accordance with said relative offsets determined in step (b), so as to selectively reduce the gain of said directivity pattern in said directions of said users in said dispersed cells during said users' time slots.