Intentional sidelobe creation

摘要

A beam having the best performance for the present downlink transmits the signal carrying information. In another beam transmitted, in a corresponding manner having the best performance in regard to the next mobile station to be communicated in a next time slot, a signal is created which has a low cross correlation relative to the present signal carrying information. The average power in the direction to the next mobile station to be communicated in the next TDMA time slot will be given by the sum of the average power of the two signals after amplification by the respective antenna pattern. This takes place because the cross correlation between the signals is low due to which fact the summed signal will show a power addition but not a coherent addition. This is feasible as the summed signal is not be decoded by the next mobile station, but used entirely as a measurement of power. To further improve operation, the interleaving beams produced by two offset Butler Matrixes and then applied to a combiner may be used.