| 摘要 |
PCT No. PCT/EP93/03432 Sec. 371 Date Jun. 6, 1995 Sec. 102(e) Date Jun. 6, 1995 PCT Filed Dec. 6, 1993 PCT Pub. No. WO94/15395 PCT Pub. Date Jul. 7, 1994There are described a procedure and circuit for adaptive compensation of the gain distortions caused by thermal drift, ageing, etc., in microwave amplifiers connected to predistortion linearizers. The procedure concerns digitally modulated signals, e.g., QAM, in which the peak to average power signal ratio is constant. Since this ratio remains constant after amplification only if the amplifier is linear, it is measured at the amplifier output, to change the AM/FM distortion characteristic of the linearizer/amplifier chain and hold the ratio on the output equal to that on the input. |
