公开(公告)号：EP1038366A1

公开(公告)日：2000-09-27

申请号：EP98961242.9

申请日：1998-11-26

申请人： Italtel s.p.a.

发明人： DONATI, Marcello ,  POLITI, Marco

IPC分类号： H04B17/00

CPC分类号： H04B17/20

摘要： It is described a testing system of the receivers of a base transceiver station for cellular telephone systems, for instance GSM 900 MHz, or DCS 1800 MHz, or TACS, etc., equipped with intelligent array antenna having N sensors. The system consists of a radiofrequency scenario simulation equipment (SIM_RF), governed by a control processor (CONTR_PC), both connected to the bus of an Ethernet network, to which the device under testing (DUT) is also connected. The simulation equipment generates on N outputs (out1, out2..., outN) a complex signal consisting of N identical radiofrequency signals (RF1, RF2,.., RFN) differing among them for a phase progessive value. These signals are withdrawn by a same number of coaxial cables and conveyed towards the N antenna input connectors (in1, in2,..., inN) of the radiofrequency signals of the receiver to be tested. The N test signals are obtained through local generation of as many groups of N digital isofrequential carriers as are required to simulate the directions of a useful signal with an arbitrary number of echoes of the same, and the directions of an arbitary number of isofrequential interferent carriers, and not, with their relevant echoes. The N carriers of each group are then modulated with appropriate modulation and digitally multiplied by a same number of relevant beamforming coefficients producing, within each group, an ordering according to gradually increasing phase values.