| 摘要 |
PURPOSE:To ensure a high quality circuit by selecting an optimum wave among plural waves and using the polarized plane incident angle/space diversity recep tion system so as to compare S/N at all times in the unit of bits and receiving a data so as to prevent noise fault and improve the bit error rate. CONSTITUTION:Two sets of receivers RX1, RX2 are used, antennas applying respective inputs are provided while being parted by a distance and the two- system diversity reception system using the space and polarized plane incident angle utilizing the difference in the propagation path of an input radio wave and the incident polarized plane is adopted. Demodulators 31, 32 convert and output a low frequency signal output from the receivers RX1, RX2 into a binary digital signal respectively. In case of a PSK demodulation, for example, from an output of each demodulator to a reception input of two systems, the S/N of the system is measured always and a better S/N is selected in the unit of bits. That is, the S/N of the demodulated output in both the systems is compared always during data reception by an S/N converter 35 comparing the S/N in the unit of bits, and only a data output of the system having the better S/N is transmitted by controlling a switch 34 and the output is transmitted to a reception terminal device 36. |
