| 摘要 |
PURPOSE:To improve the error rate characteristic due to a delay distortion by selecting a diversity branch having the highest reception level when the reception level is low and selecting the diversity branch having the least delay distortion when the reception level is high. CONSTITUTION:A signal received by diversity branches 1, 2 is inputted to receivers 3, 4, subject to identification and discrimination by demodulation circuits 5, 6 and an envelope level is extracted by envelope detection circuits 7, 8. The amplitude of the beat component of the envelope level signal extracted by high pass filters 11, 12 is fed to a delay distortion comparator circuit 17, where which diversity branch has lesser delay distortion is discriminated and when the mean reception level is higher than or equal to the threshold value, the result of the delay distortion comparator 17 is outputted respectively to the selection circuit 19. Thus, the diversity branch having the lowest mean error rate is obtained.
|
