| 摘要 |
1. An electronic antenna system for a cellular radio telephone network associating stationary stations to mobile or portable stations, this system comprising - reception antennas performing a sectorisation of the space to be covered, - at least one antenna access cable (20a ), - and reception circuits, characterized in that it comprises : - at least one array of reception antennas (1a ...8a ), - and, close to the antennas, at least one frequency transposition and multiplexing circuit (100) for transposing the signals received by the different antennas of the array in the radio frequency subbands, and for combining them, the antenna access cable (20a ) connecting the output of the transposition and multiplexing circuit (100) to these reception circuits, - and, in these reception circuits, a set of receivers (ERl ... ERm ) associated to the different reception frequencies in the radio frequency band Fj , j=l to m, a measuring receiver Ro , at least one demultiplexing and transposition circuit (200) connecting the terminal of the cable to the inputs of the receivers, at least one control circuit (300) for the selection of the transposed subband in which the signal has the highest level, on the basis of the values measured by the measuring receiver Ro and for each reception frequency Fj , each receiver being further connected to the output of the demultiplexing and transposition circuit (200) supplying a signal coming from the corresponding subband for transposing and processing it. |
