Direction determination in cellular mobile communications network

摘要

To improve the downlink carrier-to-interference (carry to interference) ratio on the mobile communication network, it is proposed to transmit on the down link in a beam steered at the base station towards the mobile terminal. To realize this, it is necessary to know whether the mobile terminal is located and in which direction.; From the antenna array, there is disclosed a method that specifies the direction to the mobile terminal location.; A symbol sequence from each antenna 2 in the antenna array is stored. Sequence includes a training sequence of bases. That in a polar diagram the sequence to create an array effect having a main lobe (major lobe) in a plurality of different successive directions are repeatedly treated in the space. Cross-correlation reference value (metric) set is derived by the synthesis between the training sequence signal and the known, calculate the cross-correlation reference value for each direction. The power ratio of the composite signal for the cross-correlation for the reference value in that direction for each direction is calculated to form a set of reference directions. To determine which direction is most likely that the direction toward the mobile terminal is assigned using the arrow for reference.